:root{--font-body:var(--font-dm-sans),"DM Sans",sans-serif;--font-display:var(--font-montserrat),"Montserrat",sans-serif;--breakpoint-sm:640px;--breakpoint-md:768px;--breakpoint-lg:1024px;--breakpoint-xl:1280px;--breakpoint-2xl:1440px;--font-size-2xs:0.6rem;--font-size-xs:0.75rem;--font-size-sm:0.875rem;--font-size-md:1rem;--font-size-lg:1.25rem;--font-size-xl:1.5rem;--font-size-2xl:2rem;--text-micro:var(--font-size-2xs);--text-caption:var(--font-size-xs);--text-label:var(--font-size-sm);--text-body:var(--font-size-md);--text-section-title:var(--font-size-lg);--text-panel-title:var(--font-size-xl);--text-page-title:var(--font-size-2xl);--font-size-100:var(--font-size-sm);--font-size-200:var(--font-size-md);--font-size-300:var(--font-size-md);--font-size-400:clamp(1.5rem,2vw,1.875rem);--font-size-500:clamp(2rem,4vw,2.75rem);--font-size-600:clamp(2.05rem,3.6vw,3.45rem);--font-size-700:clamp(2.45rem,4.3vw,4.3rem);--font-size-800:clamp(2.9rem,5vw,5rem);--space-050:0.25rem;--space-100:0.5rem;--space-150:0.75rem;--space-200:1rem;--space-300:1.5rem;--space-400:2rem;--space-500:2.5rem;--space-600:3rem;--space-700:4rem;--space-800:5rem;--radius-sm:10px;--radius-md:20px;--radius-lg:30px;--radius-pill:999px;--radius-circle:50%;--radius-card:var(--radius-sm);--radius-panel:var(--radius-md);--app-shell-inline-padding:1rem;--app-container-reading:45rem;--app-container-content:75rem;--app-container-wide:80rem;--app-nav-row-height:60px;--app-shell-sticky-offset:0px;--palette-rose-50:#fff4f6;--palette-rose-100:#f8ecef;--palette-rose-200:#fcc1c6;--palette-rose-300:#faa0a8;--palette-rose-500:#bc4361;--palette-rose-700:#71283a;--palette-rose-800:#4b1b27;--palette-rose-900:#341F29;--course-accent-color:var(--palette-rose-500);--palette-navy-50:#f4f6fb;--palette-navy-100:#e8edf5;--palette-navy-500:#414251;--palette-navy-700:#272831;--palette-navy-800:#1C2026;--palette-navy-900:#15181d;--palette-ink-900:#121326;--palette-ink-900-rgb:18,19,38;--palette-teal-50:#f0faf7;--palette-teal-100:#dff5e7;--palette-teal-200:#c2e6dd;--palette-teal-300:#8cd0c0;--palette-teal-500:#66c0ab;--palette-teal-600:#478678;--palette-teal-800:#1a4b41;--palette-mint-200:#C7EBCC;--palette-amber-50:#fff7ed;--palette-amber-100:#fdf0df;--palette-amber-300:#f3ad7b;--palette-amber-500:#ed6e1d;--palette-amber-700:#9b4d22;--palette-gold-50:#fff9e6;--palette-gold-100:#fbe6a1;--palette-gold-300:#ffd700;--palette-gold-500:#d89d2a;--palette-gold-700:#8a6414;--palette-neutral-0:#ffffff;--palette-neutral-25:#fffef9;--palette-neutral-50:#f9f9f9;--palette-neutral-100:#f0f0f0;--palette-neutral-200:#e0e0e0;--palette-neutral-300:#d1d5db;--palette-neutral-500:#6b7280;--palette-neutral-700:#4a5568;--palette-neutral-900:#1f2937;--palette-status-success-100:#dff5e7;--palette-status-success-500:#28a745;--palette-status-success-700:#185c38;--palette-status-info-100:#e6f4f8;--palette-status-info-500:#1c8db1;--palette-status-info-700:#1a586c;--palette-status-warning-100:#fff4e5;--palette-status-warning-500:#ed6e1d;--palette-status-warning-700:#9b4d22;--palette-status-danger-100:#fceaea;--palette-status-danger-500:#b42b2b;--palette-status-danger-700:#8f1f1f;--palette-overlay-soft:rgba(var(--palette-ink-900-rgb),0.04);--palette-overlay-default:rgba(var(--palette-ink-900-rgb),0.08);--palette-overlay-strong:rgba(var(--palette-ink-900-rgb),0.18);--palette-overlay-scrim:rgba(var(--palette-ink-900-rgb),0.46);--palette-overlay-glass:rgba(255,255,255,0.72);--surface-base:var(--palette-neutral-0);--surface-base-rgb:255,255,255;--surface-canvas:var(--palette-neutral-25);--surface-subtle:var(--palette-neutral-50);--surface-muted:var(--palette-neutral-100);--surface-disabled:var(--palette-neutral-300);--surface-raised:rgba(var(--surface-base-rgb),0.72);--surface-elevated:rgba(var(--surface-base-rgb),0.84);--surface-overlay:var(--palette-overlay-glass);--surface-navbar:var(--palette-navy-500);--surface-inverse:var(--palette-navy-800);--surface-inverse-raised:color-mix(in srgb,var(--surface-inverse) 88%,var(--surface-base) 12%);--surface-inverse-glass-soft:color-mix(in srgb,var(--text-inverse) 6%,transparent);--surface-inverse-glass:color-mix(in srgb,var(--text-inverse) 10%,transparent);--surface-inverse-glass-strong:color-mix(in srgb,var(--text-inverse) 14%,transparent);--surface-accent:var(--palette-rose-300);--surface-support:var(--palette-teal-50);--surface-warning:var(--palette-amber-50);--surface-success:var(--palette-status-success-100);--surface-info:var(--palette-status-info-100);--surface-danger:var(--palette-status-danger-100);--surface-highlight:var(--palette-gold-50);--text-primary:var(--palette-ink-900);--text-secondary:var(--palette-navy-500);--text-muted:#666;--text-subtle:rgba(var(--palette-ink-900-rgb),0.72);--text-faint:rgba(var(--palette-ink-900-rgb),0.52);--text-inverse:var(--palette-neutral-0);--text-subtle-inverse:color-mix(in srgb,var(--text-inverse) 72%,transparent);--text-faint-inverse:color-mix(in srgb,var(--text-inverse) 52%,transparent);--text-accent:var(--palette-rose-500);--text-support:color-mix(in srgb,var(--text-primary) 72%,var(--border-support) 28%);--text-success:var(--palette-status-success-500);--text-info:var(--palette-status-info-700);--text-warning:#ffc107;--border-default:var(--palette-neutral-200);--border-soft:rgba(var(--palette-ink-900-rgb),0.08);--border-strong:rgba(var(--palette-ink-900-rgb),0.14);--border-inverse:#cccccc;--border-inverse-soft:color-mix(in srgb,var(--text-inverse) 8%,transparent);--border-inverse-strong:color-mix(in srgb,var(--text-inverse) 14%,transparent);--border-accent:var(--palette-rose-300);--border-support:var(--palette-teal-500);--color-action-primary-bg:var(--palette-ink-900);--color-action-primary-text:var(--palette-neutral-0);--color-action-primary-hover:var(--palette-navy-700);--color-action-secondary-bg:rgba(var(--surface-base-rgb),0.72);--color-action-secondary-text:var(--text-primary);--color-action-secondary-hover:var(--surface-subtle);--color-action-inverse-text:var(--text-inverse);--color-action-inverse-border:color-mix(in srgb,var(--text-inverse) 32%,transparent);--color-action-inverse-hover:color-mix(in srgb,var(--text-inverse) 12%,transparent);--color-action-inverse-focus-ring:color-mix(in srgb,var(--text-inverse) 24%,transparent);--color-action-accent-bg:var(--palette-rose-500);--color-action-accent-text:var(--palette-neutral-0);--color-action-accent-hover:color-mix(in srgb,var(--palette-rose-500) 88%,var(--palette-ink-900) 12%);--color-action-support-bg:var(--palette-teal-500);--color-action-support-text:var(--text-primary);--color-action-support-hover:var(--palette-teal-500);--color-action-primary-heritage-bg:var(--palette-ink-900);--color-action-primary-heritage-hover:color-mix(in srgb,var(--palette-ink-900) 88%,var(--palette-neutral-0) 12%);--color-action-primary-product-bg:var(--palette-navy-500);--color-action-primary-product-hover:color-mix(in srgb,var(--palette-navy-500) 88%,var(--palette-ink-900) 12%);--color-action-warning-bg:var(--palette-amber-500);--color-action-warning-text:var(--palette-neutral-0);--color-action-danger-bg:var(--palette-status-danger-500);--color-action-danger-text:var(--palette-neutral-0);--color-action-danger-hover:var(--palette-status-danger-700);--color-action-focus-ring:rgba(var(--palette-ink-900-rgb),0.16);--color-status-success:var(--palette-status-success-500);--color-status-success-bg:var(--palette-status-success-100);--color-status-success-text:var(--palette-status-success-700);--color-status-info:var(--palette-status-info-500);--color-status-info-bg:var(--palette-status-info-100);--color-status-info-text:var(--palette-status-info-700);--color-status-warning:var(--palette-status-warning-500);--color-status-warning-bg:var(--palette-status-warning-100);--color-status-warning-text:var(--palette-status-warning-700);--color-status-danger:var(--palette-status-danger-500);--color-status-danger-bg:var(--palette-status-danger-100);--color-status-danger-text:var(--palette-status-danger-700);--overlay-soft:var(--palette-overlay-soft);--overlay-default:var(--palette-overlay-default);--overlay-strong:var(--palette-overlay-strong);--overlay-scrim:var(--palette-overlay-scrim);--overlay-glass:var(--palette-overlay-glass);--background:var(--surface-base);--background-mf:var(--surface-canvas);--background-mf-gradient:url(/Light_background.jpg) center/cover no-repeat fixed;--foreground:var(--text-primary);--background-secondary:var(--surface-subtle);--background-accent:var(--palette-rose-300);--border-primary:var(--border-default);--border-success:#4CAF50;--border-danger:#f44336;--border-info:#2196F3;--border-warning:#FF9800;--text-success-strong:#2e7d32;--text-danger-strong:#c62828;--text-info-strong:#1565c0;--text-warning-strong:#e65100;--text-danger:#f44336;--interactive-strong-bg:var(--palette-navy-500);--interactive-strong-hover:#272831;--interactive-strong-text:#ffffff;--color-accent-hover:#bc4361;--shadow-primary:0 2px 8px rgba(0,0,0,0.1);--icon-hover-filter:brightness(0) saturate(100%) invert(37%) sepia(95%) saturate(1239%) hue-rotate(316deg) brightness(84%) contrast(97%);--background-accent-2:#66c0ab;--color-rating:#FFD700;--gradient-card-back:linear-gradient(135deg,#667eea,#764ba2);--background-accent-3:#C7EBCC;--background-placeholder:#f0f0f0;--gradient-learner-plan:linear-gradient(90deg,var(--palette-teal-300) 0%,var(--palette-teal-200) 100%);--gradient-hero-heritage:linear-gradient(135deg,var(--palette-rose-300) 0%,var(--palette-rose-500) 100%);--gradient-hero-product:linear-gradient(135deg,var(--palette-navy-500) 0%,var(--palette-mint-200) 100%);--gradient-surface-serious:linear-gradient(135deg,var(--palette-rose-500) 0%,var(--palette-navy-700) 100%);--color-accent-hover-2:#1C8DB1;--surface-card:var(--surface-elevated);--shadow-color:#121326;--color-accent:var(--color-action-accent-bg);--color-accent-rgb:188,67,97;--interactive-danger-bg:var(--color-action-danger-bg);--background-panel-1:#f8ecef;--create-course-shell-background:linear-gradient(135deg,var(--palette-rose-100) 0%,color-mix(in srgb,var(--palette-rose-300) 50%,white 50%) 58%,color-mix(in srgb,var(--palette-rose-500) 40%,white 60%) 100%);--background-panel-2-gradient:linear-gradient(90deg,rgba(242,217,223,1),rgba(222,161,176,1));--background-preview-paper:#FFFEF9;--tab-bg:#EDF2F7;--tab-bg-active:#ffffff;--tab-text:#4A5568;--tab-text-active:var(--text-primary);--tab-bg-disabled:#D1D5DB;--tab-text-disabled:#6B7280;--tag-bg:#f0f4f8;--tag-text:#4a5568;--tag-icon:#a0aec0;--login-wall-bg:rgba(255,255,255,0.95);--login-wall-text:#4A3035;--login-wall-highlight-start:#BC4361;--login-wall-highlight-end:#8C3248;--shadow-strong:0 8px 30px rgba(0,0,0,0.2);--scrollbar-thumb:rgba(0,0,0,0.2);--scrollbar-thumb-hover:rgba(0,0,0,0.4);--chatbot-bg:#FFFEF9;--chatbot-input-bg:rgba(255,255,255,0.9);--chatbot-user-bubble-bg:#d07b90;--chatbot-user-bubble-text:#ffffff;--chatbot-assistant-bubble-bg:#c2e6dd;--chatbot-assistant-bubble-text:#121326;--interactive-accent-bg:#FBE6A1;--interactive-accent-text:#121326;--interactive-accent-bg-hover:#ffe761;--dot-inactive:rgba(18,19,38,0.25);--early-access-banner-gradient:linear-gradient(90deg,rgba(188,67,97,0.594),rgba(235,199,208,1));--flipbook-page-bg:#FFFEF9;--flipbook-inset-shadow-right:inset 15px 0 25px -12px rgba(0,0,0,0.35);--flipbook-inset-shadow-left:inset -15px 0 25px -12px rgba(0,0,0,0.35);--flipbook-spine-gradient-right:linear-gradient(270deg,rgba(0,0,0,0.05) 0%,rgba(0,0,0,0.3));--flipbook-spine-gradient-left:linear-gradient(90deg,rgba(0,0,0,0.05) 0%,rgba(0,0,0,0.3));--flipbook-header-text-shadow:2px 2px 4px rgba(255,255,255,0.7);--link-text:#0A2E1E;--interactive-focus-border:#0A2E1E;--google-button-bg:#ffffff;--google-button-text:#4A4A4A;--google-button-border:#e0e0e0;--coursetools-mentor-active-bg:#33366b;--coursetools-mentor-active-text:#ffffff;--coursetools-mentor-active-bg-hover:#2a2d5a;--mentoraudio-input-bg:rgba(255,255,255,0.9);--mentoraudio-input-bg-recording:#f3f4f6;--mentoraudio-input-border:rgba(0,0,0,0.1);--mentoraudio-input-text:#000000;--mentoraudio-input-placeholder:rgba(0,0,0,0.5);--mentoraudio-input-focus-bg:#f3f4f6;--mentoraudio-input-focus-border:rgba(0,0,0,0.2);--mentoraudio-input-glass-bg:linear-gradient(135deg,rgba(255,255,255,0.70),rgba(232,241,255,0.35)),rgba(255,255,255,0.25);--mentoraudio-input-glass-focus-bg:linear-gradient(135deg,rgba(255,255,255,0.60),rgba(224,236,255,0.30)),rgba(255,255,255,0.30);--mentoraudio-input-glass-shadow:inset 0 1px 0 rgba(255,255,255,0.7),0 10px 24px rgba(15,23,42,0.14);--mentoraudio-input-glass-focus-shadow:inset 0 1px 0 rgba(255,255,255,0.75),0 0 0 1px rgba(59,130,246,0.2),0 12px 26px rgba(15,23,42,0.18);--mentoraudio-input-disabled-text:rgba(55,65,81,0.55);--mentoraudio-shadow:0 8px 32px rgba(0,0,0,0.2);--mentoraudio-hover-shadow:0 10px 35px rgba(0,0,0,0.12);--mentoraudio-focus-shadow:0 8px 40px rgba(0,0,0,0.15);--mentoraudio-button-bg:rgba(0,0,0,0.05);--mentoraudio-button-border:rgba(0,0,0,0.2);--mentoraudio-button-icon:#374151;--mentoraudio-button-glass-bg:linear-gradient(160deg,rgba(255,255,255,0.8),rgba(255,255,255,0.45)),rgba(255,255,255,0.28);--mentoraudio-button-glass-hover-bg:linear-gradient(160deg,rgba(255,255,255,0.9),rgba(255,255,255,0.6)),rgba(255,255,255,0.36);--mentoraudio-button-glass-shadow:inset 0 1px 0 rgba(255,255,255,0.78),0 10px 24px rgba(15,23,42,0.15);--mentoraudio-button-glass-hover-shadow:inset 0 1px 0 rgba(255,255,255,0.85),0 12px 26px rgba(15,23,42,0.18);--mentoraudio-button-glass-border:rgba(30,41,59,0.18);--mentoraudio-button-glass-hover-border:rgba(59,130,246,0.35);--mentoraudio-mic-inner-shadow:inset 0 1px 0 rgba(255,255,255,0.65);--mentoraudio-send-hover-bg:rgba(34,197,94,0.3);--mentoraudio-mic-hover-bg:rgba(0,0,0,0.1);--mentoraudio-mic-recording-bg:rgba(239,68,68,0.2);--mentoraudio-mic-recording-border:rgba(239,68,68,0.4);--mentoraudio-mic-recording-icon:#ef4444;--mentoraudio-mic-recording-shadow:rgba(239,68,68,0.4);--mentoraudio-mic-recording-pulse-fade:rgba(239,68,68,0);--mentoraudio-input-recording-shadow:rgba(239,68,68,0.22);--mentoraudio-visualizer-speaking:linear-gradient(0deg,#10b981,#34d399,#6ee7b7);--mentoraudio-visualizer-recording:linear-gradient(0deg,#ef4444,#f87171,#fca5a5);--mentoraudio-visualizer-speaking-shadow:rgba(16,185,129,0.3);--mentoraudio-visualizer-recording-shadow:rgba(239,68,68,0.3);--mentoraudio-error-text:#ef4444;--mentoraudio-error-bg:rgba(239,68,68,0.1);--mentoraudio-error-border:rgba(239,68,68,0.2);--mentoraudio-retry-bg:rgba(239,68,68,0.2);--mentoraudio-retry-border:rgba(239,68,68,0.4);--mentoraudio-retry-text:#ffffff;--mentoraudio-retry-hover-bg:rgba(239,68,68,0.3);--mentoraudio-response-bg:rgba(255,255,255,0.7);--mentoraudio-response-shadow:0 10px 35px rgba(0,0,0,0.08);--mentoraudio-response-glass-bg:linear-gradient(135deg,rgba(255,255,255,0.74),rgba(238,245,255,0.5)),rgba(255,255,255,0.28);--mentoraudio-response-glass-border:rgba(15,23,42,0.12);--mentoraudio-response-glass-shadow:0 8px 28px rgba(15,23,42,0.14),inset 0 1px 0 rgba(255,255,255,0.64);--mentoraudio-retract-bg:rgba(255,255,255,0.8);--mentoraudio-retract-border:rgba(0,0,0,0.1);--mentoraudio-retract-icon:#374151;--mentoraudio-retract-hover-bg:#ffffff;--mentoraudio-retract-hover-icon:#111827;--mentoraudio-info-text:#575757;--mentoraudio-header-bg:rgba(59,130,246,0.1);--mentoraudio-header-border:rgba(0,0,0,0.1);--mentoraudio-header-text:#374151;--mentoraudio-header-divider:rgba(15,23,42,0.08);--mentoraudio-typing-indicator:#3b82f6;--mentoraudio-response-text:#374151;--mentoraudio-response-strong:#1f2937;--mentoraudio-response-code-bg:rgba(0,0,0,0.05);--mentoraudio-mode-toggle-active-bg:rgba(59,130,246,0.2);--mentoraudio-mode-toggle-active-border:rgba(59,130,246,0.4);--mentoraudio-mode-toggle-active-icon:#3b82f6;--mentoraudio-mode-toggle-hover-bg:rgba(59,130,246,0.2);--mentoraudio-mode-toggle-hover-border:rgba(59,130,246,0.4);--mentoraudio-mode-toggle-hover-icon:#3b82f6;--mentoraudio-speaking-indicator-core:radial-gradient(circle at 50% 50%,#8ec5fc,#e0c3fc);--mentoraudio-speaking-indicator-glow:radial-gradient(circle at 40% 40%,rgba(255,255,255,0.9),rgba(224,203,255,0.7) 30%,rgba(142,197,252,0.5) 70%,transparent);--mentoraudio-speaking-indicator-glow-shadow-1:rgba(142,197,252,0.5);--mentoraudio-speaking-indicator-glow-shadow-2:rgba(224,203,255,0.3);--mentoraudio-speaking-indicator-glow-shimmer-shadow-1:rgba(142,197,252,0.7);--mentoraudio-speaking-indicator-glow-shimmer-shadow-2:rgba(224,203,255,0.5);--mentoraudio-status-bg:rgba(255,255,255,0.7);--mentoraudio-status-border:rgba(0,0,0,0.05);--mentoraudio-status-text:#374151;--mentoraudio-mode-live-border:rgba(16,185,129,0.48);--mentoraudio-mode-live-shadow:inset 0 1px 0 rgba(255,255,255,0.82),0 12px 26px rgba(15,23,42,0.18),0 0 0 1px rgba(16,185,129,0.24);--mentoraudio-mode-dot-bg:rgba(255,255,255,0.88);--mentoraudio-mode-dot-border:rgba(15,23,42,0.25);--mentoraudio-mode-dot-shadow:0 0 8px rgba(255,255,255,0.52);--mentoraudio-mode-dot-live-bg:rgba(16,185,129,0.98);--mentoraudio-mode-dot-live-shadow:0 0 10px rgba(16,185,129,0.7);--mentoraudio-status-shadow:0 4px 12px rgba(15,23,42,0.12);--mentoraudio-scrollbar-thumb:rgba(15,23,42,0.22);--mentoraudio-bubble-shadow:0 8px 20px rgba(15,23,42,0.16);--mentoraudio-bubble-border:rgba(255,255,255,0.55);--mentoraudio-bubble-code-bg:rgba(15,23,42,0.08);--course-bg:#FFFFFF;--course-text:#333;--course-text-magazine:var(--course-text);--course-heading-text:#121326;--course-toc-bg:#FFFFFF;--course-toc-border:#e0e0e0;--course-toc-text:#1f2937;--course-toc-text-strong:#0f172a;--course-toc-text-muted:#334155;--course-toc-text-subtle:#475569;--course-math-bg:#f8f9fa;--course-toc-link:#666;--course-toc-link-active:#121326;--course-select-option-bg:#ffffff;--course-select-option-text:#0f172a;--course-quote-bg:#f9f9f9;--course-quote-text:#555;--course-table-bg:#fff;--course-table-even-row-bg:#c6c7c8;--course-table-row-hover-bg:#e3f2fd;--rating-box-bg:rgba(18,19,38,0.5);--rating-box-shadow:0 0 10px rgba(255,255,255,0.1);--rating-box-bg-hover:rgba(18,19,38,0.9);--rating-box-shadow-hover:0 0 15px rgba(255,255,255,0.3);--rating-text-color:#666;--rating-text-color-hover:var(--text-primary);--rating-highlight:#FFD700;--rating-highlight-hover:#FFA500;--rating-percentage-text-shadow:0 0 5px rgba(255,215,0,0.5);--rating-percentage-text-shadow-hover:0 0 8px rgba(255,165,0,0.7);--slider-fill-shadow:0 0 8px rgba(255,215,0,0.4);--slider-fill-shadow-hover:0 0 12px rgba(255,215,0,0.6);--slider-thumb-shadow:0 0 8px rgba(255,215,0,0.6);--slider-thumb-shadow-hover:0 0 12px rgba(255,215,0,0.8);--slider-fill-gradient:linear-gradient(to top,#FFD700,var(--rating-highlight-hover));--slider-track-bg:rgba(0,0,0,0.1);--slider-thumb-bg:#FFD700;--slider-thumb-border:#fff;--slider-thumb-bg-hover:var(--rating-highlight-hover);--quiz-question-bg:#f8f9fa;--quiz-answer-shadow:0 2px 4px rgba(0,0,0,0.05);--quiz-answer-hover-bg:#f0f9ff;--quiz-answer-hover-border:#3cc0ff;--quiz-justification-bg:rgba(60,192,255,0.1);--quiz-justification-border:rgba(60,192,255,0.3);--quiz-justification-strong-text:#1a365d;--quiz-final-score-shadow:0 4px 6px rgba(0,0,0,0.1);--summary-box-bg:color-mix(in srgb,var(--course-accent-color,#e0e0e0) 15%,white 85%);--summary-box-text:#333;--ts-menu-shadow:0 2px 10px rgba(0,0,0,0.4);--loading-bg:var(--surface-subtle,#f9f9f9);--loading-text-primary:var(--text-primary,#121326);--loading-text-secondary:var(--text-muted,#666);--loading-spinner-bg:#f3f3f3;--loading-spinner-accent:var(--text-primary,#121326);--code-bg:#f8f9fa;--code-text:#212529;--code-border:#dee2e6;--code-lang-bg:#e9ecef;--code-lang-text:#495057;--code-inline-bg:rgba(0,0,0,0.05);--code-inline-text:#c7254e}.dark{--surface-base:var(--palette-navy-900);--surface-base-rgb:22,19,23;--surface-accent:var(--palette-rose-700);--surface-canvas:#1d181d;--surface-subtle:#241e24;--surface-muted:#2d252c;--surface-support:color-mix(in srgb,var(--palette-teal-500) 16%,var(--surface-subtle));--surface-disabled:#554b53;--surface-raised:rgba(28,23,29,0.84);--surface-elevated:rgba(33,27,34,0.92);--surface-overlay:rgba(19,15,19,0.78);--surface-navbar:var(--palette-navy-900);--surface-inverse:#ffffff;--text-primary:#f6f1f4;--text-secondary:#c5b6be;--text-muted:#9f9098;--text-subtle:rgba(246,241,244,0.78);--text-faint:rgba(246,241,244,0.56);--text-subtle-inverse:rgba(21,15,20,0.74);--text-faint-inverse:rgba(21,15,20,0.54);--border-default:#433843;--border-soft:rgba(255,241,246,0.08);--border-strong:rgba(255,241,246,0.16);--color-action-primary-bg:var(--palette-teal-500);--color-action-primary-text:#ffffff;--color-action-primary-hover:#4a80d4;--background:var(--surface-base);--background-mf:var(--surface-canvas);--background-mf-gradient:url(/Dark_background.jpg) center/cover no-repeat fixed;--foreground:var(--text-primary);--background-secondary:var(--surface-subtle);--background-accent:#5c2e3a;--border-primary:var(--border-default);--border-inverse:#999999;--ts-menu-shadow:0 2px 10px rgba(0,0,0,0.4);--ts-menu-hover-bg:#f0f0f0;--text-success:#6ee7b7;--text-warning:#fbbf24;--color-status-success:#68D391;--color-status-success-bg:rgba(74,222,128,0.1);--color-status-success-text:#C6F6D5;--color-status-info:#63B3ED;--color-status-info-bg:rgba(99,179,237,0.1);--color-status-info-text:#BEE3F8;--color-status-warning:#F6AD55;--color-status-warning-bg:rgba(251,191,36,0.1);--color-status-warning-text:#FEEBC8;--color-status-danger:#FC8181;--color-status-danger-bg:rgba(248,113,113,0.1);--color-status-danger-text:#FED7D7;--surface-success:var(--color-status-success-bg);--surface-info:var(--color-status-info-bg);--surface-warning:var(--color-status-warning-bg);--surface-danger:var(--color-status-danger-bg);--border-success:var(--color-status-success);--border-danger:var(--color-status-danger);--border-info:var(--color-status-info);--border-warning:var(--color-status-warning);--text-success-strong:var(--color-status-success-text);--text-danger-strong:var(--color-status-danger-text);--text-info-strong:var(--color-status-info-text);--text-warning-strong:var(--color-status-warning-text);--text-danger:var(--color-status-danger);--text-carousel-inverse:var(--palette-neutral-700);--interactive-strong-bg:#555555;--interactive-strong-hover:#383838;--interactive-strong-text:#121212;--color-accent-hover:#e889a2;--shadow-primary:0 2px 8px rgba(255,255,255,0.05);--icon-hover-filter:brightness(0) saturate(100%) invert(69%) sepia(23%) saturate(1088%) hue-rotate(299deg) brightness(96%) contrast(90%);--background-accent-2:#489a88;--color-rating:#FFD700;--gradient-card-back:linear-gradient(135deg,#3e4482,#442a5c);--background-accent-3:#1a4b41;--background-placeholder:#2c2c2c;--color-accent-hover-2:#54b2d3;--surface-card:var(--surface-raised);--shadow-color:#000000;--color-accent:var(--color-action-accent-bg);--color-accent-rgb:188,67,97;--interactive-danger-bg:var(--color-action-danger-bg);--background-panel-1:#1b161a;--create-course-shell-background:linear-gradient(135deg,#181318 0%,#1f171d 38%,var(--palette-rose-900) 72%,var(--palette-rose-800) 100%);--background-panel-2-gradient:linear-gradient(120deg,#1b1519 0%,#261a21 52%,var(--palette-rose-900) 100%);--background-preview-paper:#1b171c;--tab-bg:#312832;--tab-bg-active:var(--palette-navy-800);--tab-text:#c0b0b9;--tab-text-active:var(--text-primary);--tab-bg-disabled:#433943;--tab-text-disabled:#8e8088;--tag-bg:#2d252d;--tag-text:#d6c7cf;--tag-icon:#aa9aa3;--login-wall-bg:rgba(20,20,20,0.95);--login-wall-text:#D1D5DB;--login-wall-highlight-start:#e889a2;--login-wall-highlight-end:#f0a6b9;--shadow-strong:0 8px 30px rgba(255,255,255,0.08);--scrollbar-thumb:rgba(255,255,255,0.2);--scrollbar-thumb-hover:rgba(255,255,255,0.4);--chatbot-bg:var(--surface-base);--chatbot-input-bg:rgba(35,29,36,0.92);--chatbot-user-bubble-bg:#c05b79;--chatbot-user-bubble-text:#fff7fa;--chatbot-assistant-bubble-bg:#35514b;--chatbot-assistant-bubble-text:#f4f0f2;--interactive-accent-bg:#978a61;--interactive-accent-text:#f3ebd1;--interactive-accent-bg-hover:#b0a171;--dot-inactive:rgba(230,230,230,0.25);--early-access-banner-gradient:linear-gradient(90deg,rgba(92,33,48,0.8),rgba(117,99,104,0.8));--flipbook-page-bg:#211f1c;--flipbook-inset-shadow-right:inset 15px 0 25px -12px rgba(0,0,0,0.5);--flipbook-inset-shadow-left:inset -15px 0 25px -12px rgba(0,0,0,0.5);--flipbook-spine-gradient-right:linear-gradient(270deg,rgba(255,255,255,0.02) 0%,rgba(255,255,255,0.1));--flipbook-spine-gradient-left:linear-gradient(90deg,rgba(255,255,255,0.02) 0%,rgba(255,255,255,0.1));--flipbook-header-text-shadow:2px 2px 4px rgba(0,0,0,0.7);--link-text:#6ee7b7;--interactive-focus-border:#6ee7b7;--google-button-bg:#2d2d2d;--google-button-text:#e0e0e0;--google-button-border:#555555;--course-bg:#1F1E1D;--course-text:#c7c7c7;--course-text-magazine:#333;--course-heading-text:#f0f0f0;--course-toc-bg:#1f1e1d;--course-toc-border:#333;--course-toc-text:#f3f4f6;--course-toc-text-strong:#f9fafb;--course-toc-text-muted:#d1d5db;--course-toc-text-subtle:#9ca3af;--course-math-bg:#1e1e1e;--course-toc-link:#aaa;--course-toc-link-active:#f0f0f0;--course-select-option-bg:#ffffff;--course-select-option-text:#0f172a;--course-quote-bg:#2a2826;--course-quote-text:#a0a0a0;--course-table-bg:#1f1e1d;--course-table-even-row-bg:#2a2826;--course-table-row-hover-bg:#3a3836;--childbook-h1-color:color-mix(in srgb,var(--course-accent-color,#f39c12) 50%,white 50%);--childbook-h2-color:color-mix(in srgb,var(--course-accent-color,#f39c12) 70%,white 30%);--childbook-h3-color:color-mix(in srgb,var(--course-accent-color,#f39c12) 90%,white 10%);--childbook-h4-color:var(--course-accent-color,#f39c12);--rating-box-bg:rgb(221,221,221);--rating-box-shadow:0 4px 15px rgba(0,0,0,0.2);--rating-box-bg-hover:rgba(245,245,245,0.9);--rating-box-shadow-hover:0 6px 20px rgba(0,0,0,0.25);--rating-text-color:#999;--rating-text-color-hover:var(--text-primary);--slider-track-bg:rgba(0,0,0,0.1);--slider-thumb-border:#ffffff;--rating-highlight:#B45309;--rating-highlight-hover:#92400E;--rating-percentage-text-shadow:none;--rating-percentage-text-shadow-hover:none;--slider-fill-shadow:none;--slider-fill-shadow-hover:none;--slider-thumb-shadow:0 2px 4px rgba(0,0,0,0.2);--slider-thumb-shadow-hover:0 2px 6px rgba(0,0,0,0.3);--quiz-question-bg:var(--surface-subtle);--quiz-answer-shadow:0 2px 4px rgba(0,0,0,0.2);--quiz-answer-hover-bg:rgba(99,179,237,0.1);--quiz-answer-hover-border:#63b3ed;--quiz-justification-bg:rgba(99,179,237,0.1);--quiz-justification-border:rgba(99,179,237,0.3);--quiz-justification-strong-text:#BEE3F8;--quiz-final-score-shadow:0 4px 6px rgba(0,0,0,0.2);--summary-box-bg:color-mix(in srgb,var(--course-accent-color,#4a5568) 20%,var(--surface-subtle) 80%);--summary-box-text:var(--text-primary);--coursetools-mentor-active-bg:#82c3ff;--coursetools-mentor-active-text:#121212;--coursetools-mentor-active-bg-hover:#6caee6;--mentoraudio-input-bg:rgba(44,44,44,0.9);--mentoraudio-input-bg-recording:#3a3a3a;--mentoraudio-input-border:rgba(255,255,255,0.1);--mentoraudio-input-text:#f0f0f0;--mentoraudio-input-placeholder:rgba(255,255,255,0.5);--mentoraudio-input-focus-bg:#3a3a3a;--mentoraudio-input-focus-border:rgba(255,255,255,0.2);--mentoraudio-input-glass-bg:linear-gradient(135deg,rgba(32,36,52,0.48),rgba(18,20,30,0.24)),rgba(10,12,20,0.2);--mentoraudio-input-glass-focus-bg:linear-gradient(135deg,rgba(37,42,62,0.58),rgba(23,26,38,0.32)),rgba(12,14,24,0.26);--mentoraudio-input-glass-shadow:inset 0 1px 0 rgba(255,255,255,0.12),0 10px 24px rgba(6,9,18,0.24);--mentoraudio-input-glass-focus-shadow:inset 0 1px 0 rgba(255,255,255,0.15),0 0 0 1px rgba(255,255,255,0.16),0 12px 26px rgba(6,9,18,0.28);--mentoraudio-input-disabled-text:rgba(255,255,255,0.5);--mentoraudio-shadow:0 8px 32px rgba(255,255,255,0.1);--mentoraudio-hover-shadow:0 10px 35px rgba(255,255,255,0.15);--mentoraudio-focus-shadow:0 8px 40px rgba(255,255,255,0.2);--mentoraudio-button-bg:rgba(255,255,255,0.1);--mentoraudio-button-border:rgba(255,255,255,0.2);--mentoraudio-button-icon:#d1d5db;--mentoraudio-button-glass-bg:linear-gradient(160deg,rgba(255,255,255,0.14),rgba(255,255,255,0.05)),rgba(20,24,38,0.28);--mentoraudio-button-glass-hover-bg:linear-gradient(160deg,rgba(255,255,255,0.2),rgba(255,255,255,0.08)),rgba(24,28,44,0.32);--mentoraudio-button-glass-shadow:inset 0 1px 0 rgba(255,255,255,0.14),0 10px 24px rgba(6,9,18,0.24);--mentoraudio-button-glass-hover-shadow:inset 0 1px 0 rgba(255,255,255,0.18),0 12px 26px rgba(6,9,18,0.3);--mentoraudio-button-glass-border:rgba(255,255,255,0.2);--mentoraudio-button-glass-hover-border:rgba(255,255,255,0.35);--mentoraudio-mic-inner-shadow:inset 0 1px 0 rgba(255,255,255,0.08);--mentoraudio-send-hover-bg:rgba(74,222,128,0.3);--mentoraudio-mic-hover-bg:rgba(255,255,255,0.2);--mentoraudio-mic-recording-bg:rgba(252,165,165,0.2);--mentoraudio-mic-recording-border:rgba(252,165,165,0.4);--mentoraudio-mic-recording-icon:#fca5a5;--mentoraudio-mic-recording-shadow:rgba(252,165,165,0.4);--mentoraudio-mic-recording-pulse-fade:rgba(239,68,68,0);--mentoraudio-input-recording-shadow:rgba(239,68,68,0.25);--mentoraudio-visualizer-speaking:linear-gradient(0deg,#34d399,#6ee7b7,#a7f3d0);--mentoraudio-visualizer-recording:linear-gradient(0deg,#f87171,#fca5a5,#fecaca);--mentoraudio-visualizer-speaking-shadow:rgba(74,222,128,0.3);--mentoraudio-visualizer-recording-shadow:rgba(252,165,165,0.3);--mentoraudio-error-text:#fca5a5;--mentoraudio-error-bg:rgba(252,165,165,0.1);--mentoraudio-error-border:rgba(252,165,165,0.2);--mentoraudio-retry-bg:rgba(252,165,165,0.2);--mentoraudio-retry-border:rgba(252,165,165,0.4);--mentoraudio-retry-text:#f0f0f0;--mentoraudio-retry-hover-bg:rgba(252,165,165,0.3);--mentoraudio-response-bg:rgba(44,44,44,0.7);--mentoraudio-response-shadow:0 10px 35px rgba(0,0,0,0.25);--mentoraudio-response-glass-bg:linear-gradient(135deg,rgba(22,24,32,0.5),rgba(22,24,32,0.25)),rgba(12,12,16,0.15);--mentoraudio-response-glass-border:rgba(255,255,255,0.12);--mentoraudio-response-glass-shadow:0 8px 28px rgba(0,0,0,0.24),inset 0 1px 0 rgba(255,255,255,0.06);--mentoraudio-retract-bg:rgba(44,44,44,0.8);--mentoraudio-retract-border:rgba(255,255,255,0.1);--mentoraudio-retract-icon:#d1d5db;--mentoraudio-retract-hover-bg:#3c3c3c;--mentoraudio-retract-hover-icon:#ffffff;--mentoraudio-info-text:#a0a0a0;--mentoraudio-header-bg:rgba(147,197,253,0.1);--mentoraudio-header-border:rgba(255,255,255,0.1);--mentoraudio-header-text:#dbeafe;--mentoraudio-header-divider:rgba(255,255,255,0.05);--mentoraudio-typing-indicator:#93c5fd;--mentoraudio-response-text:#d1d5db;--mentoraudio-response-strong:#f9fafb;--mentoraudio-response-code-bg:rgba(255,255,255,0.1);--mentoraudio-mode-toggle-active-bg:rgba(147,197,253,0.2);--mentoraudio-mode-toggle-active-border:rgba(147,197,253,0.4);--mentoraudio-mode-toggle-active-icon:#93c5fd;--mentoraudio-mode-toggle-hover-bg:rgba(147,197,253,0.2);--mentoraudio-mode-toggle-hover-border:rgba(147,197,253,0.4);--mentoraudio-mode-toggle-hover-icon:#93c5fd;--mentoraudio-speaking-indicator-core:radial-gradient(circle at 50% 50%,#3b82f6,#8b5cf6);--mentoraudio-speaking-indicator-glow:radial-gradient(circle at 40% 40%,rgba(200,220,255,0.9),rgba(190,160,255,0.7) 30%,rgba(90,150,252,0.5) 70%,transparent);--mentoraudio-speaking-indicator-glow-shadow-1:rgba(90,150,252,0.5);--mentoraudio-speaking-indicator-glow-shadow-2:rgba(190,160,255,0.3);--mentoraudio-speaking-indicator-glow-shimmer-shadow-1:rgba(90,150,252,0.7);--mentoraudio-speaking-indicator-glow-shimmer-shadow-2:rgba(190,160,255,0.5);--mentoraudio-status-bg:rgba(44,44,44,0.7);--mentoraudio-status-border:rgba(255,255,255,0.05);--mentoraudio-status-text:#d1d5db;--mentoraudio-mode-live-border:rgba(16,185,129,0.44);--mentoraudio-mode-live-shadow:inset 0 1px 0 rgba(255,255,255,0.16),0 12px 26px rgba(6,9,18,0.32),0 0 0 1px rgba(16,185,129,0.2);--mentoraudio-mode-dot-bg:rgba(255,255,255,0.45);--mentoraudio-mode-dot-border:rgba(0,0,0,0.32);--mentoraudio-mode-dot-shadow:0 0 8px rgba(255,255,255,0.35);--mentoraudio-mode-dot-live-bg:rgba(16,185,129,0.98);--mentoraudio-mode-dot-live-shadow:0 0 10px rgba(16,185,129,0.88);--mentoraudio-status-shadow:0 4px 12px rgba(0,0,0,0.1);--mentoraudio-scrollbar-thumb:rgba(0,0,0,0.2);--mentoraudio-bubble-shadow:0 8px 20px rgba(0,0,0,0.18);--mentoraudio-bubble-border:rgba(255,255,255,0.12);--mentoraudio-bubble-code-bg:rgba(0,0,0,0.1);--loading-bg:var(--surface-base,#121212);--loading-text-primary:var(--text-primary,#f0f0f0);--loading-text-secondary:var(--text-muted,#888888);--loading-spinner-bg:#333333;--loading-spinner-accent:var(--text-primary,#f0f0f0);--code-bg:#1e1e1e;--code-text:#d4d4d4;--code-border:#333;--code-lang-bg:#2d2d2d;--code-lang-text:#858585;--code-inline-bg:rgba(255,255,255,0.1);--code-inline-text:#ff8b8b;--gradient-learner-plan:linear-gradient(90deg,var(--palette-teal-500) 0%,var(--palette-teal-300) 100%)}@media (min-width:640px){:root{--app-shell-inline-padding:1.25rem}}@media (min-width:768px){:root{--app-shell-inline-padding:1.5rem}}@media (min-width:1024px){:root{--app-shell-inline-padding:2rem}}@media (min-width:1280px){:root{--app-shell-inline-padding:2.5rem}}@media (min-width:1440px){:root{--app-shell-inline-padding:3rem}}html{scroll-padding-top:calc(var(--app-shell-sticky-offset) + var(--space-300))}*,:after,:before{box-sizing:border-box}body{font-family:var(--font-body);margin:0;min-width:320px;color:var(--text-primary);background-color:var(--surface-base)}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}strong{font-weight:700}