:root{--bg-primary: #f5f5f7;--bg-secondary: #ffffff;--bg-sidebar: rgba(255, 255, 255, .72);--bg-card: rgba(255, 255, 255, .78);--bg-option: rgba(0, 0, 0, .04);--bg-option-hover: rgba(0, 0, 0, .08);--bg-correct: rgba(52, 199, 89, .12);--bg-correct-hover: rgba(52, 199, 89, .2);--bg-wrong: rgba(255, 59, 48, .1);--bg-wrong-hover: rgba(255, 59, 48, .18);--bg-disabled: rgba(0, 0, 0, .03);--text-primary: #1d1d1f;--text-secondary: #6e6e73;--text-muted: #aeaeb2;--text-sidebar: #6e6e73;--text-sidebar-active: #1d1d1f;--text-option: #1d1d1f;--text-correct: #248a3d;--text-wrong: #bf3b2f;--border-light: rgba(0, 0, 0, .08);--border-sidebar: rgba(0, 0, 0, .06);--border-correct: #34c759;--border-wrong: #ff3b30;--accent: #0071e3;--accent-hover: #0077ed;--accent-light: rgba(0, 113, 227, .1);--accent-secondary: #5865f2;--accent-warn: #ff9500;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .06);--shadow-lg: 0 8px 30px rgba(0, 0, 0, .08);--app-wallpaper: radial-gradient(circle at 12% -8%, rgba(10, 132, 255, .14), transparent 34rem), radial-gradient(circle at 88% 4%, rgba(112, 92, 255, .08), transparent 30rem), linear-gradient(155deg, #fafbff 0%, #f5f5f7 48%, #eef3f8 100%);--sidebar-wallpaper: radial-gradient(circle at 18% 0%, rgba(10, 132, 255, .08), transparent 28%);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--font-mono: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;--sidebar-width: 260px;--header-height: 56px;--transition: .22s cubic-bezier(.4, 0, .2, 1)}.dark{--bg-primary: #000000;--bg-secondary: #1c1c1e;--bg-sidebar: rgba(28, 28, 30, .85);--bg-card: rgba(28, 28, 30, .72);--bg-option: rgba(255, 255, 255, .06);--bg-option-hover: rgba(255, 255, 255, .1);--bg-correct: rgba(52, 199, 89, .15);--bg-correct-hover: rgba(52, 199, 89, .25);--bg-wrong: rgba(255, 59, 48, .12);--bg-wrong-hover: rgba(255, 59, 48, .22);--bg-disabled: rgba(255, 255, 255, .03);--text-primary: #f5f5f7;--text-secondary: #98989d;--text-muted: #636366;--text-sidebar: #98989d;--text-sidebar-active: #f5f5f7;--text-option: #e5e5ea;--text-correct: #34c759;--text-wrong: #ff453a;--border-light: rgba(255, 255, 255, .1);--border-sidebar: rgba(255, 255, 255, .08);--border-correct: #30d158;--border-wrong: #ff453a;--accent-light: rgba(0, 113, 227, .15);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 14px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);--app-wallpaper: radial-gradient(circle at 18% -10%, rgba(10, 132, 255, .2), transparent 36rem), radial-gradient(circle at 92% 8%, rgba(48, 209, 88, .08), transparent 28rem), linear-gradient(155deg, #050608 0%, #090b10 52%, #0d1118 100%);--sidebar-wallpaper: radial-gradient(circle at 18% 0%, rgba(10, 132, 255, .1), transparent 30%)}.glass-premium{--bg-primary: #0a0a0f;--bg-secondary: rgba(20, 20, 30, .5);--bg-sidebar: rgba(16, 16, 24, .65);--bg-card: rgba(26, 26, 38, .55);--bg-option: rgba(255, 255, 255, .05);--bg-option-hover: rgba(255, 255, 255, .09);--bg-correct: rgba(52, 199, 89, .12);--bg-correct-hover: rgba(52, 199, 89, .2);--bg-wrong: rgba(255, 59, 48, .1);--bg-wrong-hover: rgba(255, 59, 48, .18);--bg-disabled: rgba(255, 255, 255, .02);--text-primary: #ffffff;--text-secondary: rgba(255, 255, 255, .65);--text-muted: rgba(255, 255, 255, .42);--text-sidebar: rgba(255, 255, 255, .55);--text-sidebar-active: #ffffff;--border-light: rgba(255, 255, 255, .08);--border-sidebar: rgba(255, 255, 255, .06);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .5);--shadow-md: 0 8px 24px rgba(0, 0, 0, .5);--shadow-lg: 0 16px 48px rgba(0, 0, 0, .6);--app-wallpaper: radial-gradient(circle at 14% 2%, rgba(113, 94, 255, .24), transparent 34rem), radial-gradient(circle at 86% 10%, rgba(49, 191, 255, .15), transparent 32rem), radial-gradient(circle at 52% 92%, rgba(215, 83, 255, .1), transparent 34rem), linear-gradient(150deg, #080812 0%, #0b1020 48%, #11091b 100%);--sidebar-wallpaper: radial-gradient(circle at 18% 0%, rgba(113, 94, 255, .16), transparent 32%)}html.theme-cherry{--bg-primary: #1a0f14;--bg-secondary: rgba(30, 18, 24, .76);--bg-sidebar: rgba(22, 14, 18, .82);--bg-card: rgba(32, 20, 26, .78);--bg-option: rgba(255, 200, 220, .06);--bg-option-hover: rgba(255, 200, 220, .11);--bg-correct: rgba(52, 199, 89, .14);--bg-correct-hover: rgba(52, 199, 89, .22);--bg-wrong: rgba(255, 90, 120, .12);--bg-wrong-hover: rgba(255, 90, 120, .2);--bg-disabled: rgba(255, 200, 220, .03);--text-primary: #fce4ec;--text-secondary: rgba(255, 210, 225, .6);--text-muted: rgba(255, 210, 225, .35);--text-sidebar: rgba(255, 210, 225, .5);--text-sidebar-active: #fce4ec;--border-light: rgba(255, 180, 200, .1);--border-sidebar: rgba(255, 180, 200, .07);--accent: #ff6f9f;--accent-hover: #ff8bb2;--accent-light: rgba(255, 111, 159, .16);--accent-secondary: #ffd0df;--shadow-sm: 0 1px 3px rgba(180, 80, 110, .2);--shadow-md: 0 8px 24px rgba(180, 80, 110, .25);--shadow-lg: 0 16px 48px rgba(180, 80, 110, .3);--sidebar-workspace-bg: rgba(29, 14, 23, .88);--sidebar-workspace-panel: rgba(255, 191, 213, .065);--sidebar-workspace-panel-hover: rgba(255, 191, 213, .105);--sidebar-workspace-line: rgba(255, 167, 198, .1);--sidebar-workspace-active: rgba(255, 111, 159, .16);--sidebar-workspace-active-line: rgba(255, 139, 178, .34);--sidebar-workspace-icon: rgba(255, 191, 213, .06);--sidebar-workspace-shadow: 20px 0 68px rgba(38, 6, 20, .34);--app-wallpaper: linear-gradient(180deg, rgba(8, 10, 15, .28), rgba(12, 8, 13, .62)), linear-gradient(90deg, rgba(20, 10, 16, .52), rgba(13, 12, 18, .18) 52%, rgba(18, 9, 14, .46)), url(../images/wallpapers/scenic-sakura-lake-v1.webp);--app-wallpaper-position: center 42%;--sidebar-wallpaper: radial-gradient(circle at 18% 0%, rgba(255, 111, 159, .18), transparent 32%)}html.theme-ocean{--bg-primary: #060e18;--bg-secondary: rgba(10, 22, 40, .76);--bg-sidebar: rgba(8, 18, 32, .82);--bg-card: rgba(12, 26, 44, .78);--bg-option: rgba(100, 180, 255, .06);--bg-option-hover: rgba(100, 180, 255, .11);--bg-correct: rgba(52, 199, 130, .14);--bg-correct-hover: rgba(52, 199, 130, .22);--bg-wrong: rgba(255, 100, 100, .12);--bg-wrong-hover: rgba(255, 100, 100, .2);--bg-disabled: rgba(100, 180, 255, .03);--text-primary: #dceeff;--text-secondary: rgba(180, 215, 255, .6);--text-muted: rgba(180, 215, 255, .35);--text-sidebar: rgba(180, 215, 255, .5);--text-sidebar-active: #dceeff;--border-light: rgba(80, 160, 240, .1);--border-sidebar: rgba(80, 160, 240, .07);--accent: #31c8ff;--accent-hover: #68d7ff;--accent-light: rgba(49, 200, 255, .15);--accent-secondary: #3ce4c4;--shadow-sm: 0 1px 3px rgba(20, 80, 160, .25);--shadow-md: 0 8px 24px rgba(20, 80, 160, .3);--shadow-lg: 0 16px 48px rgba(20, 80, 160, .35);--sidebar-workspace-bg: rgba(5, 20, 35, .9);--sidebar-workspace-panel: rgba(94, 194, 255, .06);--sidebar-workspace-panel-hover: rgba(94, 194, 255, .1);--sidebar-workspace-line: rgba(72, 178, 240, .11);--sidebar-workspace-active: rgba(49, 200, 255, .15);--sidebar-workspace-active-line: rgba(104, 215, 255, .32);--sidebar-workspace-icon: rgba(94, 194, 255, .06);--sidebar-workspace-shadow: 20px 0 68px rgba(0, 9, 22, .38);--app-wallpaper: linear-gradient(180deg, rgba(3, 10, 19, .2), rgba(3, 10, 18, .58)), linear-gradient(90deg, rgba(3, 13, 25, .48), rgba(4, 15, 27, .16) 54%, rgba(2, 10, 20, .42)), url(../images/wallpapers/scenic-blue-coast-v1.webp);--app-wallpaper-position: center 40%;--sidebar-wallpaper: radial-gradient(circle at 18% 0%, rgba(49, 200, 255, .16), transparent 32%)}html.theme-forest{--bg-primary: #0c1510;--bg-secondary: rgba(16, 26, 20, .76);--bg-sidebar: rgba(12, 22, 16, .82);--bg-card: rgba(18, 30, 24, .78);--bg-option: rgba(120, 220, 160, .06);--bg-option-hover: rgba(120, 220, 160, .11);--bg-correct: rgba(52, 199, 110, .14);--bg-correct-hover: rgba(52, 199, 110, .22);--bg-wrong: rgba(255, 100, 80, .12);--bg-wrong-hover: rgba(255, 100, 80, .2);--bg-disabled: rgba(120, 220, 160, .03);--text-primary: #d4f0e0;--text-secondary: rgba(180, 230, 200, .6);--text-muted: rgba(180, 230, 200, .35);--text-sidebar: rgba(180, 230, 200, .5);--text-sidebar-active: #d4f0e0;--border-light: rgba(80, 200, 130, .1);--border-sidebar: rgba(80, 200, 130, .07);--accent: #4fd99b;--accent-hover: #79e5b5;--accent-light: rgba(79, 217, 155, .15);--accent-secondary: #b7d97a;--shadow-sm: 0 1px 3px rgba(30, 100, 60, .25);--shadow-md: 0 8px 24px rgba(30, 100, 60, .3);--shadow-lg: 0 16px 48px rgba(30, 100, 60, .35);--sidebar-workspace-bg: rgba(9, 24, 17, .9);--sidebar-workspace-panel: rgba(133, 221, 171, .06);--sidebar-workspace-panel-hover: rgba(133, 221, 171, .1);--sidebar-workspace-line: rgba(100, 205, 146, .1);--sidebar-workspace-active: rgba(79, 217, 155, .15);--sidebar-workspace-active-line: rgba(121, 229, 181, .31);--sidebar-workspace-icon: rgba(133, 221, 171, .055);--sidebar-workspace-shadow: 20px 0 68px rgba(2, 15, 8, .38);--app-wallpaper: linear-gradient(180deg, rgba(5, 14, 10, .24), rgba(5, 13, 9, .62)), linear-gradient(90deg, rgba(6, 17, 11, .5), rgba(7, 19, 13, .17) 52%, rgba(5, 14, 10, .44)), url(../images/wallpapers/scenic-mist-forest-v1.webp);--app-wallpaper-position: center 36%;--sidebar-wallpaper: radial-gradient(circle at 18% 0%, rgba(79, 217, 155, .14), transparent 32%)}html.theme-aurora{--bg-primary: #080516;--bg-secondary: rgba(16, 10, 36, .76);--bg-sidebar: rgba(12, 8, 28, .82);--bg-card: rgba(18, 12, 40, .78);--bg-option: rgba(160, 120, 255, .07);--bg-option-hover: rgba(160, 120, 255, .13);--bg-correct: rgba(80, 220, 180, .14);--bg-correct-hover: rgba(80, 220, 180, .22);--bg-wrong: rgba(255, 120, 140, .12);--bg-wrong-hover: rgba(255, 120, 140, .2);--bg-disabled: rgba(160, 120, 255, .04);--text-primary: #e8dfff;--text-secondary: rgba(210, 195, 255, .6);--text-muted: rgba(210, 195, 255, .35);--text-sidebar: rgba(210, 195, 255, .5);--text-sidebar-active: #e8dfff;--border-light: rgba(140, 100, 240, .12);--border-sidebar: rgba(140, 100, 240, .08);--accent: #a78bfa;--accent-hover: #bda8ff;--accent-light: rgba(167, 139, 250, .17);--accent-secondary: #45e5bd;--shadow-sm: 0 1px 3px rgba(80, 40, 160, .25);--shadow-md: 0 8px 24px rgba(80, 40, 160, .3);--shadow-lg: 0 16px 48px rgba(80, 40, 160, .35);--sidebar-workspace-bg: rgba(13, 8, 30, .9);--sidebar-workspace-panel: rgba(185, 155, 255, .065);--sidebar-workspace-panel-hover: rgba(185, 155, 255, .105);--sidebar-workspace-line: rgba(163, 125, 248, .12);--sidebar-workspace-active: rgba(167, 139, 250, .17);--sidebar-workspace-active-line: rgba(189, 168, 255, .34);--sidebar-workspace-icon: rgba(185, 155, 255, .06);--sidebar-workspace-shadow: 20px 0 68px rgba(8, 2, 24, .4);--app-wallpaper: linear-gradient(180deg, rgba(5, 5, 18, .16), rgba(6, 4, 17, .62)), linear-gradient(90deg, rgba(8, 5, 22, .48), rgba(7, 8, 24, .14) 52%, rgba(7, 4, 19, .42)), url(../images/wallpapers/scenic-aurora-snow-v1.webp);--app-wallpaper-position: center 30%;--sidebar-wallpaper: radial-gradient(circle at 18% 0%, rgba(167, 139, 250, .18), transparent 32%)}html.theme-sunset{--bg-primary: #120e08;--bg-secondary: rgba(28, 20, 10, .76);--bg-sidebar: rgba(22, 16, 8, .82);--bg-card: rgba(30, 22, 12, .78);--bg-option: rgba(255, 200, 100, .07);--bg-option-hover: rgba(255, 200, 100, .12);--bg-correct: rgba(52, 199, 100, .14);--bg-correct-hover: rgba(52, 199, 100, .22);--bg-wrong: rgba(255, 100, 60, .12);--bg-wrong-hover: rgba(255, 100, 60, .2);--bg-disabled: rgba(255, 200, 100, .03);--text-primary: #ffe8cc;--text-secondary: rgba(240, 215, 180, .6);--text-muted: rgba(240, 215, 180, .35);--text-sidebar: rgba(240, 215, 180, .5);--text-sidebar-active: #ffe8cc;--border-light: rgba(220, 160, 60, .12);--border-sidebar: rgba(220, 160, 60, .08);--accent: #ffb454;--accent-hover: #ffc878;--accent-light: rgba(255, 180, 84, .16);--accent-secondary: #ff756d;--shadow-sm: 0 1px 3px rgba(160, 100, 20, .25);--shadow-md: 0 8px 24px rgba(160, 100, 20, .3);--shadow-lg: 0 16px 48px rgba(160, 100, 20, .35);--sidebar-workspace-bg: rgba(28, 17, 8, .9);--sidebar-workspace-panel: rgba(255, 198, 112, .065);--sidebar-workspace-panel-hover: rgba(255, 198, 112, .105);--sidebar-workspace-line: rgba(238, 174, 78, .12);--sidebar-workspace-active: rgba(255, 180, 84, .16);--sidebar-workspace-active-line: rgba(255, 200, 120, .34);--sidebar-workspace-icon: rgba(255, 198, 112, .06);--sidebar-workspace-shadow: 20px 0 68px rgba(24, 10, 2, .38);--app-wallpaper: linear-gradient(180deg, rgba(18, 10, 5, .2), rgba(18, 9, 4, .62)), linear-gradient(90deg, rgba(24, 12, 5, .5), rgba(22, 12, 6, .14) 52%, rgba(20, 9, 4, .42)), url(../images/wallpapers/scenic-golden-dunes-v1.webp);--app-wallpaper-position: center 44%;--sidebar-wallpaper: radial-gradient(circle at 18% 0%, rgba(255, 180, 84, .17), transparent 32%)}.theme-picker-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:16px}.theme-picker-option{display:flex;min-width:0;flex-direction:column;align-items:center;gap:8px;padding:10px 8px 9px;border:1.5px solid var(--border-light);border-radius:var(--radius-md);background:var(--bg-option);cursor:pointer;transition:all var(--transition);font-family:var(--font-sans);color:var(--text-primary)}.theme-picker-option:hover{background:var(--bg-option-hover);border-color:var(--accent);transform:translateY(-1px);box-shadow:var(--shadow-sm)}.theme-picker-option.active{background:var(--accent-light);border-color:color-mix(in srgb,var(--accent) 68%,transparent)}.theme-picker-dot{width:100%;height:auto;aspect-ratio:16 / 9;border-radius:11px;border:2px solid transparent;transition:all var(--transition);box-shadow:0 2px 8px #00000026;background-color:var(--bg-primary);background-position:center;background-size:cover}.theme-picker-dot.active{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light),0 2px 12px #00000040;transform:scale(1.03)}.theme-preview-light{background-image:linear-gradient(145deg,#fff,#edf4ff 55%,#e7e5ff)}.theme-preview-dark{background-image:radial-gradient(circle at 25% 10%,#1e78bd,transparent 48%),linear-gradient(145deg,#050608,#141923)}.theme-preview-glass{background-image:radial-gradient(circle at 20% 10%,#745cff,transparent 48%),radial-gradient(circle at 80% 75%,#20bde4,transparent 52%),linear-gradient(#0b0c18,#0b0c18)}.theme-preview-cherry{background-image:linear-gradient(#0e090d14,#0e090d5c),url(../images/wallpapers/scenic-sakura-lake-v1-thumb.webp)}.theme-preview-ocean{background-image:linear-gradient(#030c180a,#030c184d),url(../images/wallpapers/scenic-blue-coast-v1-thumb.webp)}.theme-preview-forest{background-image:linear-gradient(#050f0a0d,#050f0a57),url(../images/wallpapers/scenic-mist-forest-v1-thumb.webp)}.theme-preview-aurora{background-image:linear-gradient(#05041205,#05041257),url(../images/wallpapers/scenic-aurora-snow-v1-thumb.webp)}.theme-preview-sunset{background-image:linear-gradient(#140a0408,#140a0457),url(../images/wallpapers/scenic-golden-dunes-v1-thumb.webp)}.settings-page-card{width:min(100%,760px);max-width:760px}.theme-picker-label{min-height:2.2em;font-size:11px;font-weight:500;color:var(--text-secondary);line-height:1.1;text-align:center}@media(max-width:480px){.theme-picker-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.theme-picker-option{padding:10px 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