* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        /* Removed global smooth scrolling to reduce perceived lag */

        :root {
            --primary: #08A4D5;
            --primary-light: #33B9E1;
            --primary-dark: #068DB7;
            --secondary: #33B9E1;
            --accent: #0ea5e9;
            --success: #10b981;
            --warning: #f59e0b;
            --danger: #ef4444;
            --bg-primary: #f7fafc;
            --bg-secondary: #ffffff;
            --bg-tertiary: #eef2f7;
            --surface: #ffffff;
            --surface-light: #f3f7fb;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --border: #dbe3ea;
            --shadow: rgba(0, 0, 0, 0.08);
            --glow: rgba(8, 164, 213, 0.25);
        }

        /* Theme-aware color-scheme for native controls (select dropdowns, etc.) */
        html {
            color-scheme: light;
        }

        [data-theme="dark"] {
            color-scheme: dark;
        }

        [data-theme="true-dark"] {
            color-scheme: dark;
        }

        /* Dark mode color scheme */
        [data-theme="dark"] {
            --primary: #08A4D5;
            --primary-light: #33B9E1;
            --primary-dark: #068DB7;
            --secondary: #33B9E1;
            --accent: #0ea5e9;
            --success: #10b981;
            --warning: #f59e0b;
            --danger: #ef4444;
            --bg-primary: #0A0E27;
            --bg-secondary: #141931;
            --bg-tertiary: #1a1f3a;
            --surface: #141931;
            --surface-light: #1E2539;
            --text-primary: #E8EAED;
            --text-secondary: #9AA0A6;
            --border: #2A3247;
            --shadow: rgba(0, 0, 0, 0.3);
            --glow: rgba(8, 164, 213, 0.35);
        }

        /* True Dark mode (Blackhole) color scheme */
        [data-theme="true-dark"] {
            --primary: #08A4D5;
            --primary-light: #33B9E1;
            --primary-dark: #068DB7;
            --secondary: #33B9E1;
            --accent: #0ea5e9;
            --success: #10b981;
            --warning: #f59e0b;
            --danger: #ef4444;
            --bg-primary: #000000;
            --bg-secondary: #0a0a0a;
            --bg-tertiary: #111111;
            --surface: #0a0a0a;
            --surface-light: #151515;
            --text-primary: #E8EAED;
            --text-secondary: #8A8A8A;
            --border: #1a1a1a;
            --shadow: rgba(0, 0, 0, 0.8);
            --glow: rgba(8, 164, 213, 0.45);
        }

        /* Dark mode specific overrides */
        [data-theme="dark"] body {
            background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 60%, var(--bg-primary) 100%);
        }

        [data-theme="dark"] body::before {
            background:
                radial-gradient(circle at 20% 50%, rgba(8, 164, 213, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 50%, rgba(51, 185, 225, 0.15) 0%, transparent 50%);
        }

        [data-theme="dark"] .modal-overlay {
            background: rgba(0, 0, 0, 0.7);
        }

        [data-theme="dark"] .card {
            background: rgba(20, 25, 49, 0.85);
        }

        /* Dark mode modal + components tuning */
        [data-theme="dark"] .modal {
            background:
                linear-gradient(180deg, rgba(20, 25, 49, 0.92) 0%, rgba(20, 25, 49, 0.86) 100%),
                var(--surface);
            border-color: var(--border);
            box-shadow: 0 24px 72px var(--shadow), 0 0 0 1px rgba(8, 164, 213, 0.12);
        }
        [data-theme="dark"] .modal-header {
            background: linear-gradient(135deg, rgba(8, 164, 213, 0.06) 0%, rgba(51, 185, 225, 0.06) 100%);
            border-bottom-color: var(--border);
        }
        [data-theme="dark"] .modal-footer {
            background: var(--surface);
            border-top-color: var(--border);
        }
        [data-theme="dark"] .reset-bar {
            background: var(--surface);
            border-color: var(--border);
            box-shadow: 0 8px 24px var(--shadow);
        }
        [data-theme="dark"] .alert-info {
            background: rgba(8, 164, 213, 0.16);
            border-color: var(--primary);
            color: var(--primary-light);
        }

        [data-theme="dark"] input[type="text"]::placeholder,
        [data-theme="dark"] input[type="password"]::placeholder {
            color: #64748b;
        }

        /* Dark mode keyboard hint contrast fix */
        [data-theme="dark"] .keyboard-hint {
            background: rgba(20, 25, 49, 0.9);
            color: var(--text-primary);
            border-color: var(--border);
        }

        /* Fix radio button label backgrounds in dark mode */
        /* Unselected options should be darker */
        [data-theme="dark"] label:has(input[type="radio"]:not(:checked))[style*="background: white"] {
            background: var(--bg-secondary) !important;
        }

        /* Selected option should be lighter/brighter */
        [data-theme="dark"] label:has(input[type="radio"]:checked)[style*="background: white"] {
            background: var(--surface-light) !important;
            border-color: var(--primary) !important;
        }

        /* True Dark mode (Blackhole) specific overrides */
        [data-theme="true-dark"] body {
            background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 60%, var(--bg-primary) 100%);
        }

        [data-theme="true-dark"] body::before {
            background:
                radial-gradient(circle at 20% 50%, rgba(8, 164, 213, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 80% 50%, rgba(51, 185, 225, 0.08) 0%, transparent 50%);
        }

        [data-theme="true-dark"] .modal-overlay {
            background: rgba(0, 0, 0, 0.9);
        }

        [data-theme="true-dark"] .card {
            background: rgba(10, 10, 10, 0.95);
        }

        /* True Dark mode modal + components tuning */
        [data-theme="true-dark"] .modal {
            background:
                linear-gradient(180deg, rgba(10, 10, 10, 0.92) 0%, rgba(10, 10, 10, 0.86) 100%),
                var(--surface);
            border-color: var(--border);
            box-shadow: 0 28px 84px var(--shadow), 0 0 0 1px rgba(8, 164, 213, 0.14);
        }
        [data-theme="true-dark"] .modal-header {
            background: linear-gradient(135deg, rgba(8, 164, 213, 0.05) 0%, rgba(51, 185, 225, 0.05) 100%);
            border-bottom-color: var(--border);
        }
        [data-theme="true-dark"] .modal-footer {
            background: var(--surface);
            border-top-color: var(--border);
        }
        [data-theme="true-dark"] .reset-bar {
            background: var(--surface);
            border-color: var(--border);
            box-shadow: 0 10px 28px var(--shadow);
        }
        [data-theme="true-dark"] .alert-info {
            background: rgba(8, 164, 213, 0.18);
            border-color: var(--primary);
            color: #d6f3ff;
        }

        [data-theme="true-dark"] input[type="text"]::placeholder,
        [data-theme="true-dark"] input[type="password"]::placeholder {
            color: #4a4a4a;
        }

        [data-theme="true-dark"] .keyboard-hint {
            background: rgba(10, 10, 10, 0.95);
            color: var(--text-primary);
            border-color: var(--border);
        }

        [data-theme="true-dark"] label:has(input[type="radio"]:not(:checked))[style*="background: white"] {
            background: var(--bg-secondary) !important;
        }

        [data-theme="true-dark"] label:has(input[type="radio"]:checked)[style*="background: white"] {
            background: var(--surface-light) !important;
            border-color: var(--primary) !important;
        }

        [data-theme="true-dark"] .theme-toggle {
            background: rgba(10, 10, 10, 0.95);
            border-color: var(--border);
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            background: linear-gradient(135deg, var(--bg-primary) 0%, #ffffff 60%, var(--bg-primary) 100%);
            color: var(--text-primary);
            min-height: 100vh;
            overflow-x: hidden;
            /* Reserve scrollbar space to prevent layout shift when modals lock/unlock scroll */
            scrollbar-gutter: stable both-edges;
        }

        /* Page scrollbar styling to match modal */
        html, body {
            scrollbar-width: thin;
            scrollbar-color: var(--primary) var(--surface-light);
        }
        html::-webkit-scrollbar,
        body::-webkit-scrollbar {
            width: 10px;
        }
        html::-webkit-scrollbar-track,
        body::-webkit-scrollbar-track {
            background: var(--surface-light);
        }
        html::-webkit-scrollbar-thumb,
        body::-webkit-scrollbar-thumb {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            border-radius: 8px;
            border: 2px solid var(--surface-light);
        }
        /* Lock background scroll when modal is open */
        body.modal-open { overflow: hidden; }

        /* Removed heavy fixed gradient layer to avoid full-viewport repaints on scroll */

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 2rem 20%;
            position: relative;
            z-index: 1;
        }

        .ui-language-dock {
            position: fixed;
            top: 1rem;
            left: 1rem;
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            padding: 0.5rem 0.6rem;
            background: rgba(255, 255, 255, 0.92);
            border: 1px solid var(--border);
            border-radius: 14px;
            box-shadow: 0 12px 28px var(--shadow), 0 0 0 1px rgba(255, 255, 255, 0.25);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            z-index: 9985;
            transition: box-shadow 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
            isolation: isolate;
            cursor: pointer;
        }

        .ui-language-dock::after {
            content: '';
            position: absolute;
            top: 8px;
            bottom: 8px;
            left: -1px;
            width: 3px;
            border-radius: 999px;
            background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%);
            opacity: 0.9;
            box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.12);
        }

        html[data-theme="dark"] .ui-language-dock,
        html[data-theme="true-dark"] .ui-language-dock {
            background: rgba(12, 17, 36, 0.9);
            border-color: rgba(255, 255, 255, 0.12);
            box-shadow: 0 14px 30px var(--shadow), 0 0 0 1px rgba(8, 164, 213, 0.16);
        }
        html[data-theme="true-dark"] .ui-language-dock {
            background: rgba(4, 6, 10, 0.94);
            border-color: rgba(255, 255, 255, 0.08);
            box-shadow: 0 16px 34px rgba(0, 0, 0, 0.75), 0 0 0 1px rgba(8, 164, 213, 0.2);
        }

        .ui-language-dock:hover {
            transform: translateY(-1px);
            box-shadow: 0 16px 36px var(--shadow), 0 0 0 1px rgba(8, 164, 213, 0.25);
        }

        .ui-language-dock:focus-within {
            border-color: rgba(8, 164, 213, 0.7);
            box-shadow: 0 16px 38px var(--shadow), 0 0 0 2px rgba(8, 164, 213, 0.25);
        }

        .ui-language-glow {
            position: absolute;
            inset: -30%;
            background: radial-gradient(circle at 30% 50%, rgba(8, 164, 213, 0.25), transparent 50%),
                radial-gradient(circle at 80% 40%, rgba(51, 185, 225, 0.2), transparent 55%);
            filter: blur(18px);
            opacity: 0.8;
            pointer-events: none;
        }

        .ui-language-flag-row {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            position: relative;
            z-index: 1;
        }

        .ui-language-flag-row.collapsed .ui-lang-flag:not(.active) {
            display: none;
        }

        .ui-lang-flag {
            width: 38px;
            height: 38px;
            border-radius: 12px;
            display: grid;
            place-items: center;
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--text-primary);
            background: radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.7)),
                linear-gradient(145deg, rgba(8, 164, 213, 0.14), rgba(51, 185, 225, 0.12));
            border: 1px solid rgba(0, 0, 0, 0.08);
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65), 0 10px 20px rgba(0, 0, 0, 0.12);
            cursor: pointer;
            transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
        }

        html[data-theme="dark"] .ui-lang-flag {
            color: #e5f6ff;
            background:
                linear-gradient(150deg, rgba(8, 164, 213, 0.24), rgba(51, 185, 225, 0.16)),
                linear-gradient(180deg, rgba(10, 15, 32, 0.95), rgba(13, 20, 38, 0.92));
            border-color: rgba(8, 164, 213, 0.25);
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), 0 12px 20px rgba(0, 0, 0, 0.45);
        }
        html[data-theme="true-dark"] .ui-lang-flag {
            color: #dff5ff;
            background:
                linear-gradient(155deg, rgba(8, 164, 213, 0.22), rgba(51, 185, 225, 0.1)),
                linear-gradient(180deg, rgba(4, 6, 10, 0.96), rgba(8, 10, 14, 0.92));
            border-color: rgba(8, 164, 213, 0.22);
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 12px 22px rgba(0, 0, 0, 0.65);
        }

        .ui-lang-flag:hover {
            transform: translateY(-1px) scale(1.02);
            box-shadow: 0 14px 26px rgba(0, 0, 0, 0.14), 0 0 0 1px rgba(8, 164, 213, 0.18);
        }

        .ui-lang-flag:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        .ui-lang-flag.active {
            border-color: var(--primary);
            box-shadow: 0 14px 30px rgba(8, 164, 213, 0.28), 0 0 0 1px rgba(8, 164, 213, 0.35);
            background: radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.78)),
                linear-gradient(145deg, rgba(8, 164, 213, 0.25), rgba(51, 185, 225, 0.2));
        }
        html[data-theme="dark"] .ui-lang-flag.active {
            color: #eaf6ff;
            background:
                linear-gradient(150deg, rgba(8, 164, 213, 0.32), rgba(51, 185, 225, 0.26)),
                linear-gradient(180deg, rgba(10, 17, 35, 0.96), rgba(8, 13, 26, 0.96));
            border-color: rgba(8, 164, 213, 0.6);
            box-shadow: 0 14px 30px rgba(8, 164, 213, 0.32), 0 0 0 1px rgba(8, 164, 213, 0.45);
        }
        html[data-theme="true-dark"] .ui-lang-flag.active {
            color: #e8f7ff;
            background:
                linear-gradient(155deg, rgba(8, 164, 213, 0.36), rgba(51, 185, 225, 0.22)),
                linear-gradient(180deg, rgba(5, 7, 12, 0.96), rgba(2, 4, 8, 0.96));
            border-color: rgba(8, 164, 213, 0.65);
            box-shadow: 0 14px 30px rgba(8, 164, 213, 0.38), 0 0 0 1px rgba(8, 164, 213, 0.5);
        }

        @media (max-width: 1024px) {
            .ui-language-dock {
                left: 0.75rem;
                top: 0.75rem;
            }
        }

        @media (max-width: 640px) {
            .ui-language-dock {
                left: 0.75rem;
                top: 0.75rem;
                right: auto;
                bottom: auto;
                transform: none;
                min-width: unset;
            }
            .ui-lang-flag { width: 34px; height: 34px; font-size: 1.05rem; }
        }

        /* Header */
        .header {
            text-align: center;
            margin-bottom: 3rem;
            animation: fadeInDown 0.6s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .logo {
            width: 100px;
            height: 100px;
            margin: 0 auto 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 20px 60px var(--glow);
            animation: float 3s ease-in-out infinite;
            /* Hint compositing to keep animation smooth */
            will-change: transform;
            transform: translateZ(0);
            position: relative;
            border: 2px solid var(--border); /* add depth without changing color */
            border-radius: 24px;
            /* emboss edges similar to block (neutral tones only) */
            box-shadow:
                inset 0 2px 0 rgba(255,255,255,0.15),
                inset 0 -3px 0 rgba(0,0,0,0.12),
                0 6px 0 rgba(0,0,0,0.12),
                0 20px 60px var(--glow);
        }

        .logo::before {
            content: '';
            position: absolute;
            inset: -2px;
            /* Replace heavy blur with a radial glow and soft halo */
            background: radial-gradient(closest-side, var(--primary) 0%, rgba(8, 164, 213, 0.45) 35%, transparent 70%);
            border-radius: 24px;
            z-index: -1;
            opacity: 0.6;
            box-shadow: 0 0 60px rgba(8, 164, 213, 0.25);
        }
        .logo img { box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3); }

        h1 {
            font-size: 3rem;
            font-weight: 800;
            margin: 0 auto 0.5rem auto;
            letter-spacing: -0.02em;
            position: relative;
            padding: 0.75rem 2rem;
            border-radius: 16px;
            border: 3px solid rgba(0,0,0,0.22);
            background:
                linear-gradient(180deg, rgba(255,255,255,0.15) 0%, rgba(0,0,0,0.08) 100%),
                linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            /* 3D beveled effect matching buttons */
            box-shadow:
                inset 0 3px 0 rgba(255,255,255,0.45),
                inset 0 -4px 0 rgba(0,0,0,0.3),
                0 8px 0 rgba(0,0,0,0.25),
                0 12px 40px var(--glow),
                0 0 60px rgba(8, 164, 213, 0.3);
            color: white;
            text-shadow:
                0 2px 4px rgba(0,0,0,0.4),
                0 4px 12px rgba(0,0,0,0.2),
                0 -1px 2px rgba(255,255,255,0.3);
            transform-style: preserve-3d;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            animation: titlePulse 3s ease-in-out infinite;
            width: fit-content;
            overflow: hidden;
        }

        /* Epic animated shimmer overlay */
        h1::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(
                135deg,
                transparent 0%,
                transparent 40%,
                rgba(255,255,255,0.4) 50%,
                transparent 60%,
                transparent 100%
            );
            border-radius: 16px;
            opacity: 0;
            animation: shimmer 4s ease-in-out infinite;
            pointer-events: none;
            overflow: hidden;
        }


        /* Hover effect for interactivity */
        h1:hover {
            transform: translateY(-3px) scale(1.02);
            box-shadow:
                inset 0 3px 0 rgba(255,255,255,0.5),
                inset 0 -4px 0 rgba(0,0,0,0.3),
                0 10px 0 rgba(0,0,0,0.25),
                0 16px 48px var(--glow),
                0 0 80px rgba(8, 164, 213, 0.5);
        }

        /* Pulsing glow animation */
        @keyframes titlePulse {
            0%, 100% {
                box-shadow:
                    inset 0 3px 0 rgba(255,255,255,0.45),
                    inset 0 -4px 0 rgba(0,0,0,0.3),
                    0 8px 0 rgba(0,0,0,0.25),
                    0 12px 40px var(--glow),
                    0 0 60px rgba(8, 164, 213, 0.3);
            }
            50% {
                box-shadow:
                    inset 0 3px 0 rgba(255,255,255,0.45),
                    inset 0 -4px 0 rgba(0,0,0,0.3),
                    0 8px 0 rgba(0,0,0,0.25),
                    0 12px 40px var(--glow),
                    0 0 80px rgba(8, 164, 213, 0.5);
            }
        }

        /* Shimmer animation */
        @keyframes shimmer {
            0% {
                transform: translateX(-100%) skewX(-15deg);
                opacity: 0;
            }
            50% {
                opacity: 1;
            }
            100% {
                transform: translateX(200%) skewX(-15deg);
                opacity: 0;
            }
        }

        /* Dark mode adjustments for h1 */
        [data-theme="dark"] h1 {
            border-color: rgba(0,0,0,0.4);
            background:
                linear-gradient(180deg, rgba(255,255,255,0.12) 0%, rgba(0,0,0,0.15) 100%),
                linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            box-shadow:
                inset 0 3px 0 rgba(255,255,255,0.35),
                inset 0 -4px 0 rgba(0,0,0,0.5),
                0 8px 0 rgba(0,0,0,0.5),
                0 12px 40px var(--glow),
                0 0 60px rgba(8, 164, 213, 0.4);
        }

        [data-theme="dark"] h1:hover {
            box-shadow:
                inset 0 3px 0 rgba(255,255,255,0.4),
                inset 0 -4px 0 rgba(0,0,0,0.5),
                0 10px 0 rgba(0,0,0,0.5),
                0 16px 48px var(--glow),
                0 0 90px rgba(8, 164, 213, 0.6);
        }

        /* Blackhole mode - MAXIMUM DRAMA */
        [data-theme="true-dark"] h1 {
            border-color: rgba(8, 164, 213, 0.3);
            background:
                linear-gradient(180deg, rgba(255,255,255,0.08) 0%, rgba(0,0,0,0.4) 100%),
                linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            box-shadow:
                inset 0 3px 0 rgba(255,255,255,0.25),
                inset 0 -4px 0 rgba(0,0,0,0.8),
                0 8px 0 rgba(0,0,0,0.9),
                0 12px 40px var(--glow),
                0 0 80px rgba(8, 164, 213, 0.6),
                0 0 120px rgba(51, 185, 225, 0.3);
            text-shadow:
                0 2px 4px rgba(0,0,0,0.8),
                0 4px 12px rgba(8, 164, 213, 0.4),
                0 -1px 2px rgba(255,255,255,0.2);
        }

        [data-theme="true-dark"] h1:hover {
            box-shadow:
                inset 0 3px 0 rgba(255,255,255,0.3),
                inset 0 -4px 0 rgba(0,0,0,0.8),
                0 10px 0 rgba(0,0,0,0.9),
                0 16px 48px var(--glow),
                0 0 100px rgba(8, 164, 213, 0.8),
                0 0 150px rgba(51, 185, 225, 0.4);
        }

        [data-theme="true-dark"] h1::before {
            background: linear-gradient(
                135deg,
                transparent 0%,
                transparent 40%,
                rgba(8, 164, 213, 0.6) 50%,
                transparent 60%,
                transparent 100%
            );
        }

        .subtitle {
            color: var(--text-secondary);
            font-size: 1.125rem;
            font-weight: 600;
            display: inline-block;
            padding: 0.45rem 0.85rem;
            margin: 0;
            border: 2px solid var(--border);
            border-radius: 12px;
            position: relative;
            background: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, rgba(0,0,0,0.03) 100%);
            box-shadow:
                inset 0 2px 0 rgba(255,255,255,0.15),
                inset 0 -3px 0 rgba(0,0,0,0.12),
                0 4px 0 rgba(0,0,0,0.10);
            text-shadow: 0 1px 0 rgba(255,255,255,0.25);
        }

        /* Card System */
        .card {
            background: rgba(255, 255, 255, 0.85);
            border-radius: 20px;
            padding: 2rem;
            margin-bottom: 1.5rem;
            border: 1px solid var(--border);
            box-shadow: 0 8px 24px var(--shadow);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) backwards;
        }

        .card:hover {
            border-color: var(--primary);
            box-shadow: 0 12px 48px var(--glow);
            transform: translateY(-2px);
        }

        .card.collapsed .card-content {
            display: none;
        }

        .card.collapsed {
            padding: 1.5rem 2rem;
            cursor: pointer; /* Make entire collapsed card clickable */
        }

        .card-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 1.5rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--border);
            cursor: pointer;
            user-select: none;
            position: relative;
            z-index: 1;
        }

        .card-header * { cursor: inherit; }

        .card-title-group {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .card-icon {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            box-shadow: 0 4px 12px var(--glow);
        }

        .card-title {
            font-size: 1.5rem;
            font-weight: 700;
            letter-spacing: -0.02em;
        }

        .card-badge {
            display: none;
            align-items: center;
            justify-content: center;
            min-width: 28px;
            height: 28px;
            padding: 0 0.5rem;
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            border-radius: 14px;
            font-size: 0.875rem;
            font-weight: 600;
            margin-left: 0.5rem;
            animation: scaleIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
        }

        .collapse-btn {
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--surface-light);
            border: 1px solid var(--border);
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.2s ease;
            font-size: 1.25rem;
            margin-left: 0.5rem;
        }

        .collapse-btn:hover {
            background: rgba(8, 164, 213, 0.1);
            border-color: var(--primary);
        }

        .collapse-btn.collapsed::before {
            content: '▼';
        }

        .collapse-btn:not(.collapsed)::before {
            content: '▲';
        }

        /* Toggle Switch */
        .toggle-switch {
            position: relative;
            width: 56px;
            height: 32px;
            cursor: pointer;
        }

        .toggle-switch input {
            display: none;
        }

        .toggle-slider {
            position: absolute;
            inset: 0;
            background: var(--surface-light);
            border-radius: 32px;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            border: 2px solid var(--border);
        }

        .toggle-slider::before {
            content: '';
            position: absolute;
            width: 24px;
            height: 24px;
            left: 2px;
            top: 2px;
            background: var(--text-secondary);
            border-radius: 50%;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .toggle-switch input:checked + .toggle-slider {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            border-color: var(--primary);
        }

        .toggle-switch input:checked + .toggle-slider::before {
            transform: translateX(24px);
            background: white;
        }

        /* Form Elements */
        .form-group {
            margin-bottom: 1.5rem;
        }

        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-primary);
        }

        .label-description {
            display: block;
            font-size: 0.875rem;
            color: var(--text-secondary);
            font-weight: 400;
            margin-top: 0.25rem;
        }

        /* Enhanced label styling for select dropdowns */
        .form-label {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
            margin-bottom: 0.75rem;
        }

        .label-title {
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .form-label .label-description {
            margin-top: 0;
            line-height: 1.5;
        }

        /* Enhanced select dropdown styling */
        select.styled-select {
            appearance: none;
            background-image: linear-gradient(45deg, transparent 50%, var(--text-secondary) 50%),
                              linear-gradient(135deg, var(--text-secondary) 50%, transparent 50%);
            background-position: calc(100% - 20px) calc(1em + 2px),
                                calc(100% - 15px) calc(1em + 2px);
            background-size: 5px 5px,
                            5px 5px;
            background-repeat: no-repeat;
            padding-right: 2.5rem;
            /* cursor: pointer removed - native select cursor is more appropriate */
            font-weight: 500;
        }

        select.styled-select:hover {
            border-color: var(--primary);
            background-color: var(--surface-hover, var(--surface));
        }

        select.styled-select:focus {
            background-image: linear-gradient(45deg, transparent 50%, var(--primary) 50%),
                              linear-gradient(135deg, var(--primary) 50%, transparent 50%);
        }

        input[type="text"],
        input[type="password"],
        textarea,
        select {
            width: 100%;
            padding: 0.875rem 1rem;
            background: var(--surface);
            border: 2px solid var(--border);
            border-radius: 12px;
            color: var(--text-primary);
            font-size: 1rem;
            font-family: inherit;
        }

        /* Smooth transitions only for border and shadow, NOT background */
        input[type="text"],
        input[type="password"],
        textarea {
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
        }

        select {
            transition: border-color 0.15s ease, box-shadow 0.15s ease;
        }

        input[type="text"]:focus,
        input[type="password"]:focus,
        textarea:focus,
        select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 4px var(--glow);
        }

        input.invalid,
        select.invalid {
            border-color: var(--danger);
            animation: shake 0.3s ease;
        }

        input.valid,
        select.valid {
            border-color: var(--success);
        }

        .field-error {
            color: var(--danger);
            font-size: 0.875rem;
            margin-top: 0.25rem;
            display: none;
            animation: fadeInUp 0.3s ease;
        }

        .field-error.show {
            display: block;
        }

        textarea {
            min-height: 120px;
            resize: vertical;
        }

        /* Password Toggle Eye Icon */
        .password-field-wrapper {
            position: relative;
            display: flex;
            align-items: center;
        }

        .password-field-wrapper input[type="password"],
        .password-field-wrapper input[type="text"] {
            padding-right: 3rem;
        }

        /* Mask sensitive inputs without triggering browser password managers */
        .sensitive-input.masked {
            -webkit-text-security: disc;
            text-security: disc;
        }

        .password-toggle-icon {
            position: absolute;
            right: 1rem;
            top: 50%;
            transform: translateY(-50%);
            cursor: pointer;
            font-size: 1.25rem;
            color: var(--text-secondary);
            transition: all 0.2s ease;
            user-select: none;
            z-index: 10;
        }

        .password-toggle-icon:hover {
            color: var(--primary);
            transform: translateY(-50%) scale(1.1);
        }

        /* Language Selector - Modern Chips */
        .language-search {
            position: relative;
            margin-bottom: 1rem;
        }

        .language-search input {
            padding-left: 2.5rem;
        }

        .language-search-icon {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-secondary);
            pointer-events: none;
        }

        .selected-languages {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            min-height: 42px;
            padding: 0.5rem;
            background: var(--surface);
            border: 2px solid var(--border);
            border-radius: 12px;
            margin-bottom: 1rem;
            transition: all 0.3s ease;
        }

        .selected-languages:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 4px var(--glow);
        }

        .selected-languages.empty::before {
            content: 'Click languages below to add...';
            color: var(--text-secondary);
            font-size: 0.875rem;
            display: flex;
            align-items: center;
            height: 26px;
        }

        .language-chip {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.375rem 0.75rem;
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            border-radius: 20px;
            font-size: 0.875rem;
            font-weight: 500;
            animation: chipIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .language-chip:hover {
            transform: scale(1.05);
            box-shadow: 0 4px 12px var(--glow);
        }

        .language-chip .remove {
            width: 16px;
            height: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            font-size: 0.75rem;
            transition: all 0.2s ease;
        }

        .language-chip .remove:hover {
            background: rgba(255, 255, 255, 0.3);
        }

        .language-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
            gap: 0.75rem;
            max-height: 400px;
            overflow-y: auto;
            padding: 1rem;
            background: var(--surface);
            border-radius: 12px;
            border: 2px solid var(--border);
        }

        .language-grid::-webkit-scrollbar {
            width: 8px;
        }

        .language-grid::-webkit-scrollbar-track {
            background: var(--surface);
            border-radius: 4px;
        }

        .language-grid::-webkit-scrollbar-thumb {
            background: var(--primary);
            border-radius: 4px;
        }

        .language-item {
            padding: 0.75rem 1rem;
            background: var(--surface-light);
            border: 2px solid var(--border);
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
            font-size: 0.9rem;
            font-weight: 500;
            text-align: center;
            user-select: none;
        }

        .language-item:hover {
            border-color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px var(--glow);
        }

        .language-item.selected {
            background: linear-gradient(135deg, rgba(8, 164, 213, 0.18) 0%, rgba(51, 185, 225, 0.18) 100%);
            border-color: var(--primary);
            color: var(--primary-dark);
        }

        .language-item.hidden {
            display: none;
        }

        /* Quick Actions */
        .quick-actions {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 1rem;
            flex-wrap: wrap;
        }

        .quick-btn {
            padding: 0.5rem 1rem;
            background: var(--surface-light);
            border: 1px solid var(--border);
            border-radius: 8px;
            color: var(--text-secondary);
            font-size: 0.875rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .quick-btn:hover {
            border-color: var(--primary);
            color: var(--primary-dark);
            background: rgba(8, 164, 213, 0.1);
        }

        /* Buttons */
        .btn {
            padding: 0.875rem 1.75rem;
            border: none;
            border-radius: 12px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            user-select: none;
            -webkit-user-select: none;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            white-space: nowrap;
            position: relative;
            overflow: hidden;
        }

        .btn::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 100%);
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .btn:hover::before {
            opacity: 1;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            border: 2px solid rgba(0,0,0,0.22);
            box-shadow:
                inset 0 2px 0 rgba(255,255,255,0.35),
                inset 0 -3px 0 rgba(0,0,0,0.22),
                0 6px 0 rgba(0,0,0,0.22),
                0 8px 24px var(--glow);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 32px var(--glow);
        }

        .btn-secondary {
            background: var(--surface-light);
            color: var(--text-primary);
            border: 2px solid var(--border);
            box-shadow:
                inset 0 2px 0 rgba(255,255,255,0.35),
                inset 0 -3px 0 rgba(0,0,0,0.12),
                0 6px 0 rgba(0,0,0,0.12);
        }

        .btn-secondary:hover {
            border-color: var(--primary);
            background: rgba(8, 164, 213, 0.1);
        }

        .btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none !important;
        }

        /* Subtle rivets to echo the Mario block feel (do not change colors) */
        .btn::after {
            content: '';
            position: absolute;
            width: 5px; height: 5px;
            border-radius: 50%;
            top: 6px; left: 6px;
            background: rgba(0,0,0,0.18);
            box-shadow:
                calc(100% - 12px) 0 0 rgba(0,0,0,0.18),
                0 calc(100% - 12px) 0 rgba(255,255,255,0.35),
                calc(100% - 12px) calc(100% - 12px) 0 rgba(0,0,0,0.18);
            pointer-events: none;
        }
        /* Reduce prominence for secondary to keep its neutral color */
        .btn-secondary::after { background: rgba(0,0,0,0.12); box-shadow:
            calc(100% - 12px) 0 0 rgba(0,0,0,0.12),
            0 calc(100% - 12px) 0 rgba(255,255,255,0.25),
            calc(100% - 12px) calc(100% - 12px) 0 rgba(0,0,0,0.12);
        }

        .btn-danger {
            background: rgba(239, 68, 68, 0.12);
            color: var(--danger);
            border: 2px solid var(--danger);
        }
        .btn-danger:hover {
            background: rgba(239, 68, 68, 0.18);
            box-shadow: 0 10px 28px rgba(239, 68, 68, 0.25);
        }

        .btn-group {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
            margin-top: 2rem;
        }

        /* Alert System */
        .alert {
            position: fixed;
            top: 2rem;
            right: 2rem;
            padding: 1rem 1.5rem;
            border-radius: 12px;
            display: flex;
            align-items: center;
            gap: 0.75rem;
            min-width: 300px;
            max-width: 500px;
            z-index: 9999;
            animation: slideInRight 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            box-shadow: 0 12px 48px var(--shadow);
        }

        .alert-success {
            background: rgba(16, 185, 129, 0.2);
            border: 2px solid var(--success);
            color: var(--success);
        }

        .alert-error {
            background: rgba(239, 68, 68, 0.2);
            border: 2px solid var(--danger);
            color: var(--danger);
        }

        .alert-warning {
            background: rgba(245, 158, 11, 0.2);
            border: 2px solid var(--warning);
            color: var(--warning);
        }

        .alert-info {
            background: rgba(8, 164, 213, 0.12);
            border: 2px solid var(--primary);
            color: var(--primary-dark);
        }

        /* Loading Overlay */
        .loading-overlay {
            position: fixed;
            inset: 0;
            background: rgba(255, 255, 255, 0.85);
            display: none;
            align-items: center;
            justify-content: center;
            z-index: 9998;
        }

        .loading-overlay.show {
            display: flex;
        }

        .spinner {
            width: 60px;
            height: 60px;
            border: 4px solid var(--surface-light);
            border-top-color: var(--primary);
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        /* Model Fetching Status */
        .model-status {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-top: 0.5rem;
            font-size: 0.875rem;
            color: var(--text-secondary);
        }

        .model-status.fetching {
            color: var(--primary-light);
        }

        .model-status.success {
            color: var(--success);
        }

        .model-status.error {
            color: var(--danger);
        }

        .model-status .spinner-small {
            width: 16px;
            height: 16px;
            border: 2px solid var(--surface-light);
            border-top-color: var(--primary);
            border-radius: 50%;
            animation: spin 0.8s linear infinite;
        }

        /* Animations */
        @keyframes fadeInDown {
            from {
                opacity: 0;
                transform: translateY(-30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes slideInRight {
            from {
                opacity: 0;
                transform: translateX(30px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        @keyframes chipIn {
            from {
                opacity: 0;
                transform: scale(0.8);
            }
            to {
                opacity: 1;
                transform: scale(1);
            }
        }

        @keyframes float {
            0%, 100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-10px);
            }
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-5px); }
            75% { transform: translateX(5px); }
        }

        @keyframes scaleIn {
            from {
                opacity: 0;
                transform: scale(0.5);
            }
            to {
                opacity: 1;
                transform: scale(1);
            }
        }

        /* Keyboard shortcuts hint */
        .keyboard-hint {
            position: fixed;
            bottom: 2rem;
            left: 2rem;
            padding: 0.75rem 1rem;
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid var(--border);
            border-radius: 12px;
            font-size: 0.875rem;
            color: var(--text-primary);
            opacity: 0;
            transition: opacity 0.3s ease;
            pointer-events: none;
            z-index: 1000;
        }

        .keyboard-hint.show {
            opacity: 1;
        }

        .kbd {
            display: inline-block;
            padding: 0.25rem 0.5rem;
            background: var(--surface-light);
            border: 1px solid var(--border);
            border-radius: 4px;
            font-family: monospace;
            font-size: 0.875rem;
            color: var(--primary-light);
            margin: 0 0.25rem;
        }

        /* Install URL Display */
        .install-url-box {
            margin-top: 1.5rem;
            display: none;
        }

        .install-url-box.show {
            display: block;
        }

        .install-url-box label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-primary);
        }

        .install-url-box input {
            width: 100%;
            padding: 0.875rem 1rem;
            background: var(--surface);
            border: 2px solid var(--primary);
            border-radius: 12px;
            color: var(--text-primary);
            font-size: 0.9rem;
            font-family: monospace;
            cursor: text;
        }

        .install-url-box input:focus {
            outline: none;
            box-shadow: 0 0 0 4px var(--glow);
        }

        /* Footer */
        .footer {
            text-align: center;
            padding: 3rem 2rem;
            margin-top: 4rem;
            border-top: 1px solid var(--border);
            color: var(--text-secondary);
            animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .footer-content {
            max-width: 600px;
            margin: 0 auto;
        }

        .footer-heart {
            color: var(--danger);
            animation: heartPulse 3s ease-in-out infinite;
            display: inline-block;
            text-shadow: 0 0 0 transparent;
            transition: all 0.3s ease;
        }

        .footer p {
            margin-bottom: 0.75rem;
            line-height: 1.6;
        }

        .footer a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .footer a:hover {
            color: var(--primary);
        }

        @keyframes heartPulse {
            0%, 100% {
                transform: scale(1);
                opacity: 0.9;
                text-shadow: 0 0 0 transparent;
            }
            50% {
                transform: scale(1.08);
                opacity: 1;
                text-shadow: 0 0 12px rgba(239, 68, 68, 0.4);
            }
        }

        /* Responsive */
        @media (max-width: 768px) {
            .container {
                padding: 1rem;
            }

            h1 {
                font-size: 2rem;
            }

            .card {
                padding: 1.5rem;
            }

            .card.collapsed {
                padding: 1rem 1.5rem;
            }

            .language-grid {
                grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
                max-height: 300px;
            }

            .btn-group {
                flex-direction: column;
            }

            .btn {
                width: 100%;
            }

            .alert {
                right: 1rem;
                left: 1rem;
                min-width: auto;
            }

            .keyboard-hint {
                display: none;
            }

            .selected-languages {
                max-height: 150px;
                overflow-y: auto;
            }
        }

        /* Reset bar */
        .reset-bar {
            margin: 0;
            padding: 1rem 1.25rem;
            border: 2px dashed var(--border);
            border-radius: 14px;
            background: var(--surface);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            width: 100%;
            max-width: 450px;
            margin-left: auto;
            margin-right: auto;
        }
        .reset-bar .reset-text {
            color: var(--text-secondary);
            font-weight: 600;
        }
        .reset-btn {
            appearance: none;
            border: 2px solid var(--danger);
            background: transparent;
            color: var(--danger);
            padding: 0.625rem 1rem;
            border-radius: 10px;
            font-weight: 700;
            cursor: pointer;
            transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
        }
        .reset-btn:hover {
            transform: translateY(-1px);
            box-shadow: 0 10px 28px var(--shadow);
            background: rgba(239, 68, 68, 0.08);
        }
        .reset-btn:active { transform: translateY(0); }

        /* (JS positions reset bar vertically in the gap) */

        /* Disabled Sub Toolbox option */
        #subToolboxEnabled:disabled {
            cursor: not-allowed;
            opacity: 0.5;
        }

        #subToolboxEnabled:disabled + span {
            color: var(--text-secondary);
        }

        label:has(#subToolboxEnabled:disabled) {
            opacity: 0.6;
            cursor: not-allowed;
        }

        /* Stagger animations */
        .card:nth-child(1) { animation-delay: 0.1s; }
        .card:nth-child(2) { animation-delay: 0.2s; }
        .card:nth-child(3) { animation-delay: 0.3s; }
        .card:nth-child(4) { animation-delay: 0.4s; }
        .card:nth-child(5) { animation-delay: 0.5s; }

        /* Modal System */
        .modal-overlay {
            position: fixed;
            inset: 0;
            background: rgba(255, 255, 255, 0.85);
            display: none;
            align-items: center;
            justify-content: center;
            z-index: 10000;
            animation: fadeIn 0.3s ease;
        }

        .modal-overlay.show {
            display: flex;
        }

        .modal-overlay.peek {
            inset: auto;
            bottom: 1rem;
            left: 1rem;
            right: auto;
            top: auto;
            width: min(520px, 96vw);
            max-height: 72vh;
            align-items: flex-end;
            justify-content: flex-start;
            background: none;
            animation: none;
        }

        .modal-overlay.peek .modal {
            width: 100%;
            max-width: 100%;
            box-shadow: 0 16px 44px var(--shadow);
            animation: peekIn 0.26s cubic-bezier(0.22, 1, 0.36, 1);
        }

        /* Fly-out animation for instructions modal */
        .modal-overlay.fly-out {
            animation: fadeOut 0.52s cubic-bezier(0.22, 1, 0.36, 1) forwards;
            pointer-events: none;
        }
        .modal-overlay.fly-out .modal {
            animation: flyToCorner 0.52s cubic-bezier(0.22, 1, 0.36, 1) forwards;
            transform-origin: center center;
        }

        .modal {
            background:
                linear-gradient(180deg, rgba(255,255,255,0.85) 0%, rgba(255,255,255,0.75) 100%),
                var(--bg-secondary);
            border-radius: 20px;
            max-width: 640px;
            width: 92%;
            max-height: 85vh;
            /* Clip scrollbars within rounded corners */
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: 0 24px 72px var(--shadow), 0 0 0 1px rgba(8, 164, 213, 0.14);
            animation: modalSlideIn 0.42s cubic-bezier(0.22, 1, 0.36, 1);
            position: relative;
            display: flex;
            flex-direction: column;
        }

        .modal-header {
            padding: 1.25rem 1.5rem;
            border-bottom: 1px solid var(--border);
            background: linear-gradient(135deg, rgba(8, 164, 213, 0.08) 0%, rgba(51, 185, 225, 0.08) 100%);
            position: sticky;
            top: 0;
            z-index: 1;
        }

        /* Legacy instructions-fab removed; map show/hide to .help-button */
        .help-button { opacity: 1; }
        .help-button.show { opacity: 1; }

        /* Animations for overlay fade and fly trajectory */
        @keyframes fadeOut {
            from { opacity: 1; }
            to { opacity: 0; }
        }
        @keyframes peekIn {
            from { transform: translateY(8px); opacity: 0; }
            to { transform: translateY(0); opacity: 1; }
        }
        @keyframes flyToCorner {
            0%   { transform: translate(0, 0) scale(1);    opacity: 1; }
            60%  { transform: translate(calc(28vw - 28px), calc(26vh)) scale(0.55); opacity: 0.98; }
            100% { transform: translate(calc(40vw - 40px), calc(40vh)) scale(0.2); opacity: 0.95; }
        }
        /* Removed pulsing shadow animation for smoother scrolling */

        .modal-header h2 {
            font-size: 1.5rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--primary-light) 0%, var(--secondary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin: 0;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        /* (modal-header emboss reverted to original) */

        .modal-close {
            position: absolute;
            top: 1.5rem;
            right: 1.5rem;
            width: 36px;
            height: 36px;
            background: var(--surface-light);
            border: 1px solid var(--border);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s ease;
            font-size: 1.25rem;
            color: var(--text-secondary);
        }

        .modal-close:hover {
            background: rgba(239, 68, 68, 0.1);
            border-color: var(--danger);
            color: var(--danger);
            transform: rotate(90deg);
        }

        .modal-content {
            padding: 1.5rem;
            text-align: center;
            /* Make only content area scrollable */
            overflow: auto;
            -webkit-overflow-scrolling: touch;
            flex: 1 1 auto;
            /* Keep layout centered even when scrollbar appears */
            scrollbar-gutter: stable both-edges;
        }

        .modal-content h3 {
            color: var(--primary-light);
            font-size: 1.125rem;
            font-weight: 600;
            margin: 1.5rem 0 0.75rem 0;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .modal-content h3:first-child {
            margin-top: 0;
        }

        .modal-content ol {
            margin: 0.75rem auto;
            padding-left: 1.5rem;
            color: var(--text-primary);
            line-height: 1.8;
            text-align: left;
            max-width: fit-content;
        }

        .modal-content li {
            margin: 0.5rem 0;
            color: var(--text-primary);
        }

        .modal-content p {
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0.75rem 0;
        }

        .modal-content strong {
            color: var(--text-primary);
            font-weight: 600;
        }

        .modal-content em {
            color: var(--warning);
            font-style: normal;
            font-weight: 600;
        }

        .modal-footer {
            padding: 1rem 1.5rem;
            border-top: 1px solid var(--border);
            display: flex;
            gap: 1rem;
            justify-content: flex-end;
            position: sticky;
            bottom: 0;
            background: var(--bg-secondary);
        }

        /* In-modal scrollbar styling (WebKit/Blink) */
        .modal-content::-webkit-scrollbar {
            width: 10px;
        }
        .modal-content::-webkit-scrollbar-track {
            background: var(--surface-light);
            border-radius: 12px;
            /* Keep track inset from header/footer to avoid visual bleed */
            margin: 8px;
        }
        .modal-content::-webkit-scrollbar-thumb {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            border-radius: 8px;
            border: 2px solid var(--surface-light);
        }
        /* Firefox scrollbar styling */
        .modal-content {
            scrollbar-width: thin;
            scrollbar-color: var(--primary) var(--surface-light);
        }

        .modal-checkbox {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-right: auto;
            color: var(--text-secondary);
            font-size: 0.875rem;
            cursor: pointer;
            user-select: none;
        }

        .modal-checkbox input[type="checkbox"] {
            width: 18px;
            height: 18px;
            cursor: pointer;
        }

        .highlight-box {
            background: rgba(245, 158, 11, 0.1);
            border: 2px solid var(--warning);
            border-radius: 12px;
            padding: 1rem;
            margin: 1rem 0;
        }

        .highlight-box p {
            color: var(--warning);
            font-weight: 600;
            margin: 0;
        }

        .info-box {
            background: rgba(8, 164, 213, 0.08);
            border: 1px solid rgba(8, 164, 213, 0.35);
            border-radius: 12px;
            padding: 0.9rem 1rem;
            margin: 1rem 0;
        }

        .info-box p {
            color: var(--text-secondary);
            font-weight: 500;
            margin: 0;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
            }
            to {
                opacity: 1;
            }
        }

        @keyframes modalSlideIn {
            from {
                opacity: 0;
                transform: translateY(-30px) scale(0.95);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        /* Scrollbar for modal */
        .modal::-webkit-scrollbar {
            width: 10px;
        }

        .modal::-webkit-scrollbar-track {
            background: var(--surface);
            border-radius: 0 24px 24px 0;
        }

        .modal::-webkit-scrollbar-thumb {
            background: var(--primary);
            border-radius: 5px;
        }

        .modal::-webkit-scrollbar-thumb:hover {
            background: var(--primary-light);
        }

        .version-badge {
            display: inline-flex;
            align-items: center;
            font-size: 0.82rem;
            font-weight: 700;
            padding: 0.45rem 0.85rem;
            margin: 0;
            border-radius: 12px;
            background: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, rgba(0,0,0,0.03) 100%);
            border: 2px solid var(--border);
            color: var(--text-secondary) !important;
            -webkit-text-fill-color: var(--text-secondary) !important;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            box-shadow:
                inset 0 2px 0 rgba(255, 255, 255, 0.15),
                inset 0 -3px 0 rgba(0, 0, 0, 0.12),
                0 4px 0 rgba(0, 0, 0, 0.10);
        }

        .version-badge::before {
            content: none;
        }

        .version-badge:hover {
            border-color: var(--primary);
            color: var(--text-primary) !important;
            -webkit-text-fill-color: var(--text-primary) !important;
            box-shadow:
                inset 0 2px 0 rgba(255, 255, 255, 0.15),
                inset 0 -3px 0 rgba(0, 0, 0, 0.12),
                0 4px 12px rgba(8, 164, 213, 0.18);
        }

        .version-badge:hover::before {
            content: none;
        }

        .version-badge-wrapper {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 0.35rem;
            margin-top: 0.5rem;
        }

        /* Prevent text selection on hero title, subtitle, and version badge */
        .header h1,
        .header .subtitle,
        .header .version-badge {
            user-select: none;
        }

        /* Validation Buttons */
        .validate-api-btn {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            color: white;
            border: 2px solid rgba(0,0,0,0.22);
            border-radius: 10px;
            padding: 0.625rem 1rem;
            font-size: 0.875rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 0.375rem;
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
            white-space: nowrap;
            box-shadow:
                inset 0 2px 0 rgba(255,255,255,0.35),
                inset 0 -3px 0 rgba(0,0,0,0.22),
                0 6px 0 rgba(0,0,0,0.18),
                0 2px 8px rgba(8, 164, 213, 0.25);
            min-width: 85px;
            justify-content: center;
            }

        .validate-api-btn::after {
            content: '';
            position: absolute;
            width: 4px; height: 4px; border-radius: 50%;
            top: 6px; left: 6px;
            background: rgba(0,0,0,0.18);
            box-shadow:
                calc(100% - 12px) 0 0 rgba(0,0,0,0.18),
                0 calc(100% - 12px) 0 rgba(255,255,255,0.35),
                calc(100% - 12px) calc(100% - 12px) 0 rgba(0,0,0,0.18);
            pointer-events: none;
        }

        .validate-api-btn:hover {
            transform: translateY(-2px);
            box-shadow:
                inset 0 2px 0 rgba(255,255,255,0.4),
                inset 0 -3px 0 rgba(0,0,0,0.22),
                0 6px 0 rgba(0,0,0,0.18),
                0 4px 16px rgba(8, 164, 213, 0.4);
            background: linear-gradient(135deg, var(--primary-light) 0%, var(--secondary) 100%);
        }

        .validate-api-btn:active {
            transform: translateY(0);
        }

        .validate-api-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .validate-api-btn.validating {
            background: linear-gradient(135deg, var(--text-secondary) 0%, #64748b 100%);
            pointer-events: none;
        }

        .validate-api-btn.validating .validate-icon {
            animation: spin 1s linear infinite;
        }

        .validate-api-btn.success {
            background: linear-gradient(135deg, var(--success) 0%, #34d399 100%);
        }

        .validate-api-btn.error {
            background: linear-gradient(135deg, var(--danger) 0%, #f87171 100%);
        }

        .validate-icon {
            font-size: 1rem;
            display: inline-block;
        }

        /* OpenSubtitles auth layout */
        .opensubs-auth-layout {
            display: grid;
            grid-template-columns: 1fr minmax(240px, 280px);
            gap: 1rem;
            align-items: stretch;
            margin-top: 0.5rem;
        }
        @media (max-width: 900px) {
            .opensubs-auth-layout {
                grid-template-columns: 1fr;
            }
        }
        .opensubs-auth-fields {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .validate-tile {
            position: relative;
            padding: 1rem;
            border-radius: 14px;
            border: 1px solid var(--border);
            background:
                linear-gradient(135deg, rgba(8, 164, 213, 0.12), rgba(51, 185, 225, 0.08)),
                var(--surface);
            box-shadow: 0 10px 32px var(--shadow);
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
            justify-content: center;
            align-self: stretch;
            overflow: hidden;
        }
        .validate-tile::before {
            content: '';
            position: absolute;
            inset: -40% auto auto -40%;
            width: 120%;
            height: 120%;
            background: radial-gradient(circle at center, rgba(8, 164, 213, 0.18), transparent 55%);
            opacity: 0.75;
            pointer-events: none;
            filter: blur(16px);
        }
        .validate-tile .tile-eyebrow {
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--text-secondary);
        }
        .validate-tile .tile-title {
            font-weight: 800;
            font-size: 1.1rem;
            letter-spacing: -0.01em;
        }
        .validate-tile .tile-copy {
            margin: 0;
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }
        .validate-tile .validate-api-btn {
            width: 100%;
            justify-content: center;
        }

        

        .validation-feedback {
            margin-top: 0.5rem;
            padding: 0.75rem;
            border-radius: 8px;
            font-size: 0.875rem;
            display: none;
            animation: slideDown 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .validation-feedback.show {
            display: block;
        }

        .validation-feedback.success {
            background: rgba(16, 185, 129, 0.1);
            border: 1px solid rgba(16, 185, 129, 0.3);
            color: #059669;
        }

        .validation-feedback.error {
            background: rgba(239, 68, 68, 0.1);
            border: 1px solid rgba(239, 68, 68, 0.3);
            color: #dc2626;
        }

        .validation-feedback.info {
            background: rgba(8, 164, 213, 0.1);
            border: 1px solid rgba(8, 164, 213, 0.3);
            color: var(--primary-dark);
        }

        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Theme Toggle Button */
        .theme-toggle {
            position: fixed;
            top: 2rem;
            right: 2rem;
            width: 48px;
            height: 48px;
            background: rgba(255, 255, 255, 0.9);
            border: 2px solid var(--border);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            z-index: 9999;
            box-shadow: 0 4px 12px var(--shadow);
            user-select: none;
            -webkit-user-select: none;
            -webkit-tap-highlight-color: transparent;
        }

        [data-theme="dark"] .theme-toggle {
            background: rgba(20, 25, 49, 0.9);
            border-color: var(--border);
        }

        .theme-toggle:focus,
        .theme-toggle:focus-visible {
            outline: none;
            box-shadow: 0 0 0 3px rgba(8, 164, 213, 0.35), 0 8px 20px var(--shadow);
        }

        .theme-toggle:hover {
            transform: translateY(-2px) scale(1.05);
            box-shadow: 0 8px 20px var(--shadow);
            border-color: var(--primary);
        }

        .theme-toggle:active {
            transform: translateY(0) scale(0.98);
        }

        .theme-toggle-icon {
            font-size: 1.5rem;
            transition: all 0.3s ease;
            user-select: none;
            -webkit-user-drag: none;
            pointer-events: none;
        }

        .theme-toggle-icon.sun {
            display: block;
        }

        .theme-toggle-icon.moon {
            display: none;
        }

        .theme-toggle-icon.blackhole {
            display: none;
        }

        [data-theme="dark"] .theme-toggle-icon.sun {
            display: none;
        }

        [data-theme="dark"] .theme-toggle-icon.moon {
            display: block;
        }

        [data-theme="dark"] .theme-toggle-icon.blackhole {
            display: none;
        }

        [data-theme="true-dark"] .theme-toggle-icon.sun {
            display: none;
        }

        [data-theme="true-dark"] .theme-toggle-icon.moon {
            display: none;
        }

        [data-theme="true-dark"] .theme-toggle-icon.blackhole {
            display: block;
        }

        @media (max-width: 768px) {
            .theme-toggle {
                top: 1rem;
                right: 1rem;
                width: 42px;
                height: 42px;
            }

            .theme-toggle-icon {
                font-size: 1.25rem;
            }
        }

/* Mario-style block + coin animation (perf-friendly: transforms only) */
        .theme-toggle.mario {
            background: linear-gradient(180deg, #f7d13e 0%, #e6b526 60%, #d49c1d 100%);
            border-color: #8a5a00;
            box-shadow:
                inset 0 2px 0 #fff3b0,
                inset 0 -3px 0 #b47a11,
                0 6px 0 #7a4d00,
                0 10px 16px rgba(0,0,0,0.35);
            position: fixed;
        }
        .theme-toggle.mario::before {
            content: '';
            position: absolute;
            width: 5px; height: 5px; border-radius: 50%;
            background: #b47a11;
            top: 6px; left: 6px;
            box-shadow:
                calc(100% - 12px) 0 0 #b47a11,
                0 calc(100% - 12px) 0 #b47a11,
                calc(100% - 12px) calc(100% - 12px) 0 #b47a11;
            opacity: .9;
        }
        .theme-toggle.mario:active { transform: translateY(2px) scale(0.98); box-shadow:
            inset 0 1px 0 #fff3b0,
            inset 0 -1px 0 #b47a11,
            0 4px 0 #7a4d00,
            0 8px 14px rgba(0,0,0,0.3);
        }
        .theme-toggle-icon { transition: transform 0.25s ease; display: grid; place-items: center; }
        .theme-toggle-icon svg {
            display: block;
            filter: drop-shadow(0 2px 0 rgba(0,0,0,0.2));
            pointer-events: none;
            user-select: none;
            -webkit-user-drag: none;
        }
        /* Coin effect */
        .coin { position: fixed; left: 0; top: 0; width: 22px; height: 22px; pointer-events: none; z-index: 10000; transform: translate(-50%, -50%); will-change: transform, opacity; contain: layout paint style; }
        .coin::before { content: ''; display: block; width: 100%; height: 100%; border-radius: 50%;
            background:
                linear-gradient(90deg, rgba(0,0,0,0) 45%, rgba(0,0,0,0.2) 55%) ,
                radial-gradient(40% 40% at 35% 30%, #fff6bf 0%, rgba(255,255,255,0) 70%),
                linear-gradient(180deg, #ffd24a 0%, #ffc125 50%, #e2a415 100%);
            border: 2px solid #8a5a00; box-shadow: 0 2px 0 #7a4d00, inset 0 1px 0 #fff8c6;
        }
        @keyframes coin-pop {
            0% { opacity: 0; transform: translate(-50%, -50%) translateY(0) scale(0.9) rotateY(0deg); }
            10% { opacity: 1; }
            60% { transform: translate(-50%, -50%) translateY(-52px) scale(1.0) rotateY(360deg); }
            100% { opacity: 0; transform: translate(-50%, -50%) translateY(-70px) scale(0.95) rotateY(540deg); }
        }
        .coin.animate { animation: coin-pop 0.7s cubic-bezier(.2,.8,.2,1) forwards; }
        @media (prefers-reduced-motion: reduce) { .coin.animate { animation: none; opacity: 0; } }

        /* Theme-based variants for Mario toggle */
        [data-theme="light"] .theme-toggle.mario {
            background: linear-gradient(180deg, #f7d13e 0%, #e6b526 60%, #d49c1d 100%);
            border-color: #8a5a00;
            box-shadow:
                inset 0 2px 0 #fff3b0,
                inset 0 -3px 0 #b47a11,
                0 6px 0 #7a4d00,
                0 10px 16px rgba(0,0,0,0.35);
        }
        [data-theme="light"] .theme-toggle.mario::before {
            background: #b47a11;
            box-shadow:
                calc(100% - 12px) 0 0 #b47a11,
                0 calc(100% - 12px) 0 #b47a11,
                calc(100% - 12px) calc(100% - 12px) 0 #b47a11;
        }

        [data-theme="dark"] .theme-toggle.mario {
            background: linear-gradient(180deg, #4c6fff 0%, #2f4ed1 60%, #1e2f8a 100%);
            border-color: #1b2a78;
            box-shadow:
                inset 0 2px 0 #b3c4ff,
                inset 0 -3px 0 #213a9a,
                0 6px 0 #16246a,
                0 10px 16px rgba(20,25,49,0.6);
        }
        [data-theme="dark"] .theme-toggle.mario::before {
            background: #213a9a;
            box-shadow:
                calc(100% - 12px) 0 0 #213a9a,
                0 calc(100% - 12px) 0 #213a9a,
                calc(100% - 12px) calc(100% - 12px) 0 #213a9a;
        }

        [data-theme="true-dark"] .theme-toggle.mario {
            background: linear-gradient(180deg, #1b1029 0%, #110b1a 60%, #0b0711 100%);
            border-color: #3b2a5d;
            box-shadow:
                inset 0 2px 0 #6b65ff33,
                inset 0 -3px 0 #2b2044,
                0 6px 0 #2a1e43,
                0 0 18px rgba(107,101,255,0.35);
        }
        [data-theme="true-dark"] .theme-toggle.mario::before {
            background: #2b2044;
            box-shadow:
                calc(100% - 12px) 0 0 #2b2044,
                0 calc(100% - 12px) 0 #2b2044,
                calc(100% - 12px) calc(100% - 12px) 0 #2b2044;
        }

        /* Mario-style section icons: same as toggle, slightly different (radius, rivets size) */
        .card-icon {
            position: relative;
            width: 50px; height: 50px;
            border: none;
            background: linear-gradient(180deg, #f7d13e 0%, #e6b526 60%, #d49c1d 100%);
            border-radius: 12px; /* chunkier block edges for the bigger icons */
            color: #3b2a00;
            text-shadow: none;
            box-shadow:
                inset 0 2px 0 #fff3b0,
                inset 0 -3px 0 #b47a11,
                0 6px 0 #7a4d00,
                0 10px 16px rgba(0,0,0,0.25);
            display: grid;
            place-items: center;
        }
        .card-icon svg {
            width: 34px;
            height: 34px;
            display: block;
        }
        .card-icon .card-icon-symbol {
            font-size: 1.6rem;
            line-height: 1;
            transform: translateY(0.5px);
        }
        .card-header:hover .card-icon { transform: translateY(-1px); }
        .card-icon::before {
            display: none;
        }
        [data-theme="dark"] .card-icon { 
            border: none; 
            background: linear-gradient(180deg, #4c6fff 0%, #2f4ed1 60%, #1e2f8a 100%);
            color: #0f1a4a;
            box-shadow:
                inset 0 2px 0 #b3c4ff,
                inset 0 -3px 0 #213a9a,
                0 6px 0 #16246a,
                0 10px 16px rgba(20,25,49,0.35);
        }
        [data-theme="dark"] .card-icon::before { display: none; }
        [data-theme="true-dark"] .card-icon {
            border: none;
            background: linear-gradient(180deg, #1b1029 0%, #110b1a 60%, #0b0711 100%);
            color: #bdb4ff;
            box-shadow:
                inset 0 2px 0 #6b65ff33,
                inset 0 -3px 0 #2b2044,
                0 6px 0 #2a1e43,
                0 0 18px rgba(107,101,255,0.25);
        }
        [data-theme="true-dark"] .card-icon::before { display: none; }

        .quick-stats-grid {
            background: var(--surface-light);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 1rem;
        }
        .quick-stat {
            padding: 0.5rem 0.75rem;
            border-radius: 8px;
            background: var(--surface);
            border: 1px solid var(--border);
        }
        .quick-stat-label {
            margin: 0;
            color: var(--text-secondary);
            font-size: 0.85rem;
        }
        .quick-stat-value {
            display: block;
            margin-top: 0.25rem;
            font-size: 1.05rem;
            color: var(--text-primary);
        }

        /* Help button — match toggle style, slightly different (radius, rivets) */
        .help-button {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 56px;
            height: 56px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            cursor: pointer;
            z-index: 1000;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }
        .help-button.toolbox-button {
            left: 2rem;
            right: auto;
        }
        .help-button:hover { transform: translateY(-2px); }
        .help-button.mario {
            border: 2px solid #8a5a00;
            background: linear-gradient(180deg, #f7d13e 0%, #e6b526 60%, #d49c1d 100%);
            color: #3b2a00;
            border-radius: 14px; /* slight diff vs toggle */
            box-shadow:
                inset 0 2px 0 #fff3b0,
                inset 0 -3px 0 #b47a11,
                0 6px 0 #7a4d00,
                0 10px 16px rgba(0,0,0,0.35);
            text-shadow: 0 1px 0 rgba(255,255,255,0.6);
            position: fixed;
        }
        .help-button.mario::before {
            content: '';
            position: absolute;
            width: 5px; height: 5px; border-radius: 50%; opacity: .9;
            background: #b47a11; top: 6px; left: 6px;
            box-shadow: calc(100% - 12px) 0 0 #b47a11;
        }
        .toolbox-button {
            left: 2rem;
            right: auto;
            width: 64px;
            height: 64px;
            border-radius: 18px;
            background: radial-gradient(circle at 28% 22%, #fff3c4 0%, #ffd27f 22%, #ff9d5c 46%, #ff5a7f 72%, #40142f 100%);
            border: 2px solid #3b0f1f;
            box-shadow:
                0 10px 18px rgba(0,0,0,0.32),
                0 12px 30px rgba(255,77,122,0.38),
                inset 0 2px 0 rgba(255,255,255,0.65),
                inset 0 -3px 0 rgba(66,11,38,0.75);
            position: fixed;
            overflow: visible;
        }
        .toolbox-button::before {
            content: '';
            position: absolute;
            inset: -9px;
            border-radius: 22px;
            background: radial-gradient(circle, rgba(255,93,155,0.4), rgba(255,93,155,0));
            opacity: 0.65;
            filter: blur(6px);
            z-index: -1;
            animation: toolbox-breathe 3.2s ease-in-out infinite;
        }
        .toolbox-button::after {
            content: '';
            position: absolute;
            inset: 6px;
            border-radius: 14px;
            background: linear-gradient(135deg, rgba(255,255,255,0.42), rgba(255,255,255,0.08));
            mix-blend-mode: screen;
            pointer-events: none;
        }
        .toolbox-button:hover {
            transform: translateY(-4px) scale(1.03);
            box-shadow:
                0 14px 24px rgba(0,0,0,0.35),
                0 16px 34px rgba(255,77,122,0.45),
                inset 0 2px 0 rgba(255,255,255,0.75),
                inset 0 -3px 0 rgba(66,11,38,0.8);
        }
        .toolbox-button.show {
            animation: toolbox-pop 0.24s ease-out;
        }
        .toolbox-button .toolbox-icon {
            width: 72%;
            height: 72%;
            display: flex;
            align-items: center;
            justify-content: center;
            filter: drop-shadow(0 2px 2px rgba(0,0,0,0.25));
            pointer-events: none;
        }
        .toolbox-button .toolbox-icon svg {
            width: 100%;
            height: 100%;
        }
        [data-theme="dark"] .toolbox-button {
            background: radial-gradient(circle at 30% 18%, #ffe8c7 0%, #f9c76c 18%, #ff8c61 44%, #ff5a93 70%, #2a1b4d 100%);
            border-color: #2c1b4a;
            box-shadow:
                0 10px 18px rgba(0,0,0,0.38),
                0 12px 30px rgba(116,138,255,0.3),
                inset 0 2px 0 rgba(255,255,255,0.55),
                inset 0 -3px 0 rgba(30,19,66,0.9);
        }
        [data-theme="true-dark"] .toolbox-button {
            background: radial-gradient(circle at 30% 18%, #ffe8c7 0%, #c57aff 24%, #6d49ff 50%, #281c69 78%, #0c0b1a 100%);
            border-color: #201644;
            box-shadow:
                0 10px 20px rgba(0,0,0,0.45),
                0 14px 30px rgba(107,101,255,0.4),
                inset 0 2px 0 rgba(255,255,255,0.4),
                inset 0 -3px 0 rgba(29,18,79,0.9);
        }
        @keyframes toolbox-pop {
            0% { transform: scale(0.85) translateY(8px); opacity: 0; }
            100% { transform: scale(1) translateY(0); opacity: 1; }
        }
        @keyframes toolbox-breathe {
            0% { transform: scale(0.94); opacity: 0.5; }
            50% { transform: scale(1.02); opacity: 0.8; }
            100% { transform: scale(0.94); opacity: 0.5; }
        }
        @media (max-width: 768px) {
            .toolbox-button {
                display: none !important;
            }
        }
        [data-theme="dark"] .help-button.mario {
            border-color: #1b2a78;
            background: linear-gradient(180deg, #4c6fff 0%, #2f4ed1 60%, #1e2f8a 100%);
            color: #0f1a4a;
            box-shadow:
                inset 0 2px 0 #b3c4ff,
                inset 0 -3px 0 #213a9a,
                0 6px 0 #16246a,
                0 10px 16px rgba(20,25,49,0.6);
        }
        [data-theme="dark"] .help-button.mario::before { background: #213a9a; box-shadow: calc(100% - 12px) 0 0 #213a9a; }
        [data-theme="true-dark"] .help-button.mario {
            border-color: #3b2a5d;
            background: linear-gradient(180deg, #1b1029 0%, #110b1a 60%, #0b0711 100%);
            color: #bdb4ff;
            box-shadow:
                inset 0 2px 0 #6b65ff33,
                inset 0 -3px 0 #2b2044,
                0 6px 0 #2a1e43,
                0 0 18px rgba(107,101,255,0.35);
        }
        [data-theme="true-dark"] .help-button.mario::before { background: #2b2044; box-shadow: calc(100% - 12px) 0 0 #2b2044; }

/* V3 Warning Tooltip - Responsive Design */
        .v3-warning-tooltip {
            position: relative;
            display: inline-flex;
            align-items: center;
        }

        .v3-warning-tooltip .warning-icon {
            font-size: 1rem;
            color: var(--warning);
            cursor: help;
            animation: warningPulse 2s ease-in-out infinite;
            user-select: none;
            -webkit-tap-highlight-color: transparent;
            font-family: "Segoe UI Emoji", "Apple Color Emoji", "Noto Color Emoji", "Twemoji Mozilla", sans-serif;
            line-height: 1;
            display: inline-flex;
            align-items: center;
        }

        .v3-warning-tooltip .tooltip-bubble {
            position: absolute;
            background: rgba(245, 158, 11, 0.96);
            color: white;
            padding: 0.625rem 0.875rem;
            border-radius: 8px;
            font-size: 0.8125rem;
            font-weight: 500;
            line-height: 1.4;
            white-space: normal;
            word-wrap: break-word;
            overflow-wrap: break-word;
            opacity: 0;
            visibility: hidden;
            display: none !important;
            pointer-events: none;
            transition: opacity 0.2s ease, transform 0.2s ease;
            z-index: 10000;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);

            /* Mobile-first: show below the icon */
            top: calc(100% + 8px);
            left: 50%;
            transform: translateX(-50%) translateY(-4px);
            max-width: min(280px, calc(100vw - 32px));
            width: max-content;
        }

        /* Arrow pointing up (for mobile bottom position) */
        .v3-warning-tooltip .tooltip-bubble::before {
            content: '';
            position: absolute;
            bottom: 100%;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 0;
            border-left: 6px solid transparent;
            border-right: 6px solid transparent;
            border-bottom: 6px solid rgba(245, 158, 11, 0.96);
        }

        /* Show tooltip on hover/focus */
        .v3-warning-tooltip:hover .tooltip-bubble,
        .v3-warning-tooltip .warning-icon:focus + .tooltip-bubble {
            display: block !important;
            opacity: 1;
            visibility: visible;
            pointer-events: auto;
            transform: translateX(-50%) translateY(0);
        }

        /* Desktop: show to the right if enough space */
        @media (min-width: 769px) {
            .v3-warning-tooltip .tooltip-bubble {
                top: 50%;
                left: calc(100% + 10px);
                transform: translateY(-50%) translateX(-4px);
                max-width: min(320px, calc(100vw - 60px));
                width: max-content;
            }

            .v3-warning-tooltip .tooltip-bubble::before {
                bottom: auto;
                left: auto;
                right: 100%;
                top: 50%;
                transform: translateY(-50%);
                border: none;
                border-top: 6px solid transparent;
                border-bottom: 6px solid transparent;
                border-right: 6px solid rgba(245, 158, 11, 0.96);
            }

            .v3-warning-tooltip:hover .tooltip-bubble,
            .v3-warning-tooltip .warning-icon:focus + .tooltip-bubble {
                display: block !important;
                transform: translateY(-50%) translateX(0);
            }
        }

        /* Animation for warning icon */
        @keyframes warningPulse {
            0%, 100% {
                transform: scale(1);
                opacity: 1;
            }
            50% {
                transform: scale(1.15);
                opacity: 0.85;
            }
        }