* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --bg-primary: #050508;
    --bg-secondary: rgba(15, 17, 25, 0.85);
    --bg-tertiary: rgba(25, 28, 40, 0.9);
    --bg-glass: rgba(20, 22, 35, 0.65);
    --bg-glass-light: rgba(35, 40, 60, 0.4);
    --bg-gradient: radial-gradient(
            ellipse at 20% 20%,
            rgba(74, 158, 255, 0.15) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 80% 80%,
            rgba(99, 102, 241, 0.06) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 50% 50%,
            rgba(15, 17, 25, 0.95) 0%,
            #050508 100%
        );
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a8;
    --text-muted: #6b727c;
    --accent: #4a9eff;
    --accent-soft: rgba(74, 158, 255, 0.15);
    --accent-glow: rgba(74, 158, 255, 0.3);
    --success: #34d399;
    --success-soft: rgba(52, 211, 153, 0.15);
    --error: #f87171;
    --error-soft: rgba(248, 113, 113, 0.15);
    --warning: #fbbf24;
    --warning-soft: rgba(251, 191, 36, 0.15);
    --border: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.12);
    --code-bg: rgba(10, 12, 20, 0.95);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --blur-sm: blur(8px);
    --blur-md: blur(16px);
    --blur-lg: blur(24px);
    --font-main: "Inter", sans-serif;
    --font-code: "JetBrains Mono", monospace;
    --logo-glass-bg: rgba(74, 158, 255, 0.15);
    --logo-glass-bg-hover: rgba(74, 158, 255, 0.22);
    --logo-border-color: rgba(74, 158, 255, 0.3);
}
[data-theme="midnight"] {
    --bg-primary: #050508;
    --bg-secondary: rgba(15, 17, 25, 0.85);
    --bg-tertiary: rgba(25, 28, 40, 0.9);
    --bg-glass: rgba(20, 22, 35, 0.65);
    --bg-gradient: radial-gradient(
            ellipse at 20% 20%,
            rgba(74, 158, 255, 0.15) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 80% 80%,
            rgba(99, 102, 241, 0.06) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 50% 50%,
            rgba(15, 17, 25, 0.95) 0%,
            #050508 100%
        );
    --accent: #4a9eff;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a8;
    --logo-glass-bg: rgba(74, 158, 255, 0.15);
    --logo-glass-bg-hover: rgba(74, 158, 255, 0.22);
    --logo-border-color: rgba(74, 158, 255, 0.3);
}
[data-theme="forest"] {
    --bg-primary: #020a06;
    --bg-secondary: rgba(10, 30, 20, 0.85);
    --bg-tertiary: rgba(20, 45, 30, 0.9);
    --bg-glass: rgba(15, 35, 25, 0.65);
    --bg-gradient: radial-gradient(
            ellipse at 20% 20%,
            rgba(52, 211, 153, 0.12) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 80% 80%,
            rgba(16, 185, 129, 0.06) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 50% 50%,
            rgba(10, 30, 20, 0.95) 0%,
            #020a06 100%
        );
    --accent: #34d399;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a8;
    --logo-glass-bg: rgba(52, 211, 153, 0.15);
    --logo-glass-bg-hover: rgba(52, 211, 153, 0.22);
    --logo-border-color: rgba(52, 211, 153, 0.3);
}
[data-theme="sunset"] {
    --bg-primary: #0a0505;
    --bg-secondary: rgba(30, 15, 15, 0.85);
    --bg-tertiary: rgba(45, 25, 25, 0.9);
    --bg-glass: rgba(35, 20, 20, 0.65);
    --bg-gradient: radial-gradient(
            ellipse at 20% 20%,
            rgba(249, 115, 22, 0.12) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 80% 80%,
            rgba(239, 68, 68, 0.06) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 50% 50%,
            rgba(30, 15, 15, 0.95) 0%,
            #0a0505 100%
        );
    --accent: #f97316;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a8;
    --logo-glass-bg: rgba(249, 115, 22, 0.15);
    --logo-glass-bg-hover: rgba(249, 115, 22, 0.22);
    --logo-border-color: rgba(249, 115, 22, 0.3);
}
[data-theme="purple"] {
    --bg-primary: #08050a;
    --bg-secondary: rgba(20, 15, 30, 0.85);
    --bg-tertiary: rgba(35, 25, 50, 0.9);
    --bg-glass: rgba(30, 20, 45, 0.65);
    --bg-gradient: radial-gradient(
            ellipse at 20% 20%,
            rgba(167, 139, 250, 0.12) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 80% 80%,
            rgba(139, 92, 246, 0.06) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 50% 50%,
            rgba(20, 15, 30, 0.95) 0%,
            #08050a 100%
        );
    --accent: #a78bfa;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a8;
    --logo-glass-bg: rgba(167, 139, 250, 0.15);
    --logo-glass-bg-hover: rgba(167, 139, 250, 0.22);
    --logo-border-color: rgba(167, 139, 250, 0.3);
}
[data-theme="ocean"] {
    --bg-primary: #030810;
    --bg-secondary: rgba(10, 25, 45, 0.85);
    --bg-tertiary: rgba(15, 40, 70, 0.9);
    --bg-glass: rgba(12, 35, 60, 0.65);
    --bg-gradient: radial-gradient(
            ellipse at 20% 20%,
            rgba(6, 182, 212, 0.12) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 80% 80%,
            rgba(14, 165, 233, 0.06) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 50% 50%,
            rgba(10, 25, 45, 0.95) 0%,
            #030810 100%
        );
    --accent: #06b6d4;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a8;
    --logo-glass-bg: rgba(6, 182, 212, 0.15);
    --logo-glass-bg-hover: rgba(6, 182, 212, 0.22);
    --logo-border-color: rgba(6, 182, 212, 0.3);
}
[data-theme="crimson"] {
    --bg-primary: #0a0304;
    --bg-secondary: rgba(35, 12, 15, 0.85);
    --bg-tertiary: rgba(55, 20, 25, 0.9);
    --bg-glass: rgba(45, 15, 20, 0.65);
    --bg-gradient: radial-gradient(
            ellipse at 20% 20%,
            rgba(239, 68, 68, 0.12) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 80% 80%,
            rgba(220, 38, 38, 0.06) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 50% 50%,
            rgba(35, 12, 15, 0.95) 0%,
            #0a0304 100%
        );
    --accent: #ef4444;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a8;
    --logo-glass-bg: rgba(239, 68, 68, 0.15);
    --logo-glass-bg-hover: rgba(239, 68, 68, 0.22);
    --logo-border-color: rgba(239, 68, 68, 0.3);
}
[data-theme="cloud"] {
    --bg-primary: #f0f4f8;
    --bg-secondary: rgba(255, 255, 255, 0.85);
    --bg-tertiary: rgba(226, 232, 240, 0.9);
    --bg-glass: rgba(255, 255, 255, 0.7);
    --bg-glass-light: rgba(241, 245, 249, 0.6);
    --bg-gradient: radial-gradient(
            ellipse at 20% 20%,
            rgba(59, 130, 246, 0.08) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 80% 80%,
            rgba(99, 102, 241, 0.04) 0%,
            transparent 50%
        ),
        linear-gradient(180deg, #f0f4f8 0%, #e2e8f0 100%);
    --accent: #3b82f6;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: rgba(0, 0, 0, 0.08);
    --border-light: rgba(0, 0, 0, 0.12);
    --code-bg: #1e293b;
    --accent-soft: rgba(59, 130, 246, 0.12);
    --success-soft: rgba(34, 197, 94, 0.12);
    --error-soft: rgba(239, 68, 68, 0.12);
    --warning-soft: rgba(234, 179, 8, 0.12);
    --logo-glass-bg: rgba(59, 130, 246, 0.12);
    --logo-glass-bg-hover: rgba(59, 130, 246, 0.18);
    --logo-border-color: rgba(59, 130, 246, 0.25);
}
[data-theme="sand"] {
    --bg-primary: #faf7f2;
    --bg-secondary: rgba(255, 252, 247, 0.85);
    --bg-tertiary: rgba(231, 223, 210, 0.9);
    --bg-glass: rgba(255, 250, 240, 0.7);
    --bg-glass-light: rgba(254, 249, 237, 0.6);
    --bg-gradient: radial-gradient(
            ellipse at 20% 20%,
            rgba(217, 119, 6, 0.08) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse at 80% 80%,
            rgba(180, 83, 9, 0.04) 0%,
            transparent 50%
        ),
        linear-gradient(180deg, #faf7f2 0%, #f5f0e6 100%);
    --accent: #d97706;
    --text-primary: #292524;
    --text-secondary: #78716c;
    --text-muted: #a8a29e;
    --border: rgba(0, 0, 0, 0.08);
    --border-light: rgba(0, 0, 0, 0.12);
    --code-bg: #292524;
    --accent-soft: rgba(217, 119, 6, 0.12);
    --success-soft: rgba(34, 197, 94, 0.12);
    --error-soft: rgba(239, 68, 68, 0.12);
    --warning-soft: rgba(234, 179, 8, 0.12);
    --logo-glass-bg: rgba(217, 119, 6, 0.12);
    --logo-glass-bg-hover: rgba(217, 119, 6, 0.18);
    --logo-border-color: rgba(217, 119, 6, 0.25);
}
[data-font="inter"] {
    --font-main: "Inter", sans-serif;
}
[data-font="jetbrains"] {
    --font-main: "JetBrains Mono", monospace;
}
[data-font="merriweather"] {
    --font-main: "Merriweather", Georgia, serif;
}
[data-font="space"] {
    --font-main: "Space Grotesk", sans-serif;
}
[data-font="fira"] {
    --font-main: "Fira Code", monospace;
}
[data-font="playfair"] {
    --font-main: "Playfair Display", Georgia, serif;
}
html {
    scroll-behavior: smooth;
    font-size: 16px;
    scroll-padding-top: 80px;
    scroll-snap-type: none;
}
html,
body {
    scroll-behavior: smooth;
}
body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.75;
    min-height: 100vh;
    overflow-x: hidden;
}
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-gradient);
    pointer-events: none;
    z-index: -1;
}
body::after {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
    z-index: -1;
}
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 72px;
    background: var(--bg-glass);
    backdrop-filter: var(--blur-md);
    -webkit-backdrop-filter: var(--blur-md);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(1rem, 4vw, 2rem);
}
.nav-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}
.nav-brand {
    font-size: 1.15rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.brand-logo-wrapper {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 4px;
    border-radius: 8px;
    background: var(--logo-glass-bg);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid var(--logo-border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}
.brand-logo-wrapper:hover {
    background: var(--logo-glass-bg-hover);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateY(-1px);
}
.brand-logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 4px;
}
.home-btn {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--bg-glass-light);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-secondary);
    text-decoration: none;
}
.home-btn:hover {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: var(--accent);
}
.home-btn svg {
    width: 18px;
    height: 18px;
}
.nav-center {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    max-width: calc(100% - 320px);
    overflow: visible;
}
.nav-pill {
    display: inline-flex;
    align-items: center;
    background: rgba(28, 30, 38, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 999px;
    padding: 6px 8px;
    gap: 2px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4),
        0 0 0 1px rgba(255, 255, 255, 0.05) inset;
}

[data-theme="midnight"] .nav-pill {
    background: rgba(20, 22, 35, 0.95);
    border-color: rgba(74, 158, 255, 0.15);
}
[data-theme="forest"] .nav-pill {
    background: rgba(15, 28, 22, 0.95);
    border-color: rgba(52, 211, 153, 0.15);
}
[data-theme="sunset"] .nav-pill {
    background: rgba(30, 20, 18, 0.95);
    border-color: rgba(249, 115, 22, 0.15);
}
[data-theme="purple"] .nav-pill {
    background: rgba(22, 18, 32, 0.95);
    border-color: rgba(167, 139, 250, 0.15);
}
[data-theme="ocean"] .nav-pill {
    background: rgba(12, 22, 35, 0.95);
    border-color: rgba(6, 182, 212, 0.15);
}
[data-theme="crimson"] .nav-pill {
    background: rgba(30, 15, 18, 0.95);
    border-color: rgba(239, 68, 68, 0.15);
}
[data-theme="cloud"] .nav-pill {
    background: rgba(255, 255, 255, 0.98);
    border-color: rgba(0, 0, 0, 0.08);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1),
        0 0 0 1px rgba(0, 0, 0, 0.03) inset;
}
[data-theme="sand"] .nav-pill {
    background: rgba(255, 252, 245, 0.98);
    border-color: rgba(180, 83, 9, 0.12);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08),
        0 0 0 1px rgba(180, 83, 9, 0.05) inset;
}

.nav-links {
    display: flex;
    gap: 2px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 999px;
    transition: all 0.2s ease;
    white-space: nowrap;
    display: block;
}

.nav-links a:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="cloud"] .nav-links a:hover,
[data-theme="sand"] .nav-links a:hover {
    background: rgba(0, 0, 0, 0.06);
}

.nav-links a.active {
    color: #fff;
    background: var(--accent);
    box-shadow: 0 2px 8px rgba(74, 158, 255, 0.3);
}

[data-theme="midnight"] .nav-links a.active {
    background: linear-gradient(135deg, #4a9eff, #667eea);
    box-shadow: 0 2px 10px rgba(74, 158, 255, 0.35);
}
[data-theme="forest"] .nav-links a.active {
    background: linear-gradient(135deg, #34d399, #059669);
    box-shadow: 0 2px 10px rgba(52, 211, 153, 0.35);
}
[data-theme="sunset"] .nav-links a.active {
    background: linear-gradient(135deg, #f97316, #ea580c);
    box-shadow: 0 2px 10px rgba(249, 115, 22, 0.35);
}
[data-theme="purple"] .nav-links a.active {
    background: linear-gradient(135deg, #a78bfa, #8b5cf6);
    box-shadow: 0 2px 10px rgba(167, 139, 250, 0.35);
}
[data-theme="ocean"] .nav-links a.active {
    background: linear-gradient(135deg, #06b6d4, #0891b2);
    box-shadow: 0 2px 10px rgba(6, 182, 212, 0.35);
}
[data-theme="crimson"] .nav-links a.active {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    box-shadow: 0 2px 10px rgba(239, 68, 68, 0.35);
}
[data-theme="cloud"] .nav-links a.active {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: #fff;
    box-shadow: 0 2px 10px rgba(59, 130, 246, 0.35);
}
[data-theme="sand"] .nav-links a.active {
    background: linear-gradient(135deg, #d97706, #b45309);
    color: #fff;
    box-shadow: 0 2px 10px rgba(217, 119, 6, 0.35);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}
.nav-btn {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--bg-glass-light);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-secondary);
}
.nav-btn:hover {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: var(--accent);
}
.settings-btn svg {
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.settings-btn.active svg {
    transform: rotate(360deg);
}
.nav-btn.has-bookmark {
    color: var(--warning);
    border-color: var(--warning);
}
.nav-btn svg {
    width: 20px;
    height: 20px;
}
.hamburger {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--bg-glass-light);
    border: 1px solid var(--border);
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    transition: all 0.2s ease;
}
.hamburger:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
}
.hamburger span {
    width: 18px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 2px;
    transition: all 0.3s ease;
}
.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
}
.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}
.mobile-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-glass);
    backdrop-filter: var(--blur-lg);
    -webkit-backdrop-filter: var(--blur-lg);
    z-index: 999;
    padding: 1.5rem;
    flex-direction: column;
    gap: 0.5rem;
    overflow-y: auto;
}
.mobile-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    padding: 1rem 1.25rem;
    border-radius: 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.mobile-menu a:hover,
.mobile-menu a.active {
    color: var(--accent);
    background: var(--accent-soft);
    border-color: var(--accent);
}
.mobile-menu a .day-num {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    background: var(--bg-glass-light);
    border-radius: 4px;
    font-weight: 600;
}
.settings-panel {
    position: fixed;
    top: 72px;
    right: 0;
    width: 320px;
    max-width: 90vw;
    height: calc(100vh - 72px);
    background: var(--bg-glass);
    backdrop-filter: var(--blur-lg);
    -webkit-backdrop-filter: var(--blur-lg);
    border-left: 1px solid var(--border);
    z-index: 998;
    padding: 1.5rem;
    flex-direction: column;
    gap: 1.5rem;
    overflow-y: auto;
}
.settings-panel h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}
.settings-section {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.settings-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}
.settings-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}
.settings-opt {
    padding: 0.75rem;
    border-radius: 8px;
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    cursor: pointer;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}
.settings-opt:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}
.settings-opt.active {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent);
}
.settings-opt.theme-opt {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}
.settings-opt .theme-preview {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--border);
}
.theme-midnight .theme-preview {
    background: linear-gradient(135deg, #050508, #4a9eff);
}
.theme-forest .theme-preview {
    background: linear-gradient(135deg, #020a06, #34d399);
}
.theme-sunset .theme-preview {
    background: linear-gradient(135deg, #0a0505, #f97316);
}
.theme-purple .theme-preview {
    background: linear-gradient(135deg, #08050a, #a78bfa);
}
.theme-ocean .theme-preview {
    background: linear-gradient(135deg, #030810, #06b6d4);
}
.theme-crimson .theme-preview {
    background: linear-gradient(135deg, #0a0304, #ef4444);
}
.theme-cloud .theme-preview {
    background: linear-gradient(135deg, #f0f4f8, #3b82f6);
}
.theme-sand .theme-preview {
    background: linear-gradient(135deg, #faf7f2, #d97706);
}
.font-size-control {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    border: 1px solid var(--border);
}
.font-size-btn {
    width: 36px;
    height: 36px;
    border-radius: 6px;
    background: var(--bg-glass-light);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}
.font-size-btn:hover {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: var(--accent);
}
.font-size-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}
.font-size-value {
    font-size: 0.9rem;
    color: var(--text-primary);
    min-width: 50px;
    text-align: center;
}
.bookmark-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}
.bookmark-status {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    text-align: center;
}
.bookmark-status.has-bookmark {
    color: var(--warning);
}
.bookmark-actions {
    display: flex;
    gap: 0.5rem;
}
.bookmark-actions button {
    flex: 1;
    padding: 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
}
.bookmark-actions button:hover {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: var(--accent);
}
.bookmark-actions button.danger:hover {
    background: var(--error-soft);
    color: var(--error);
    border-color: var(--error);
}
.container {
    max-width: 860px;
    margin: 0 auto;
    padding: calc(72px + 2rem) clamp(1rem, 5vw, 2.5rem) 3rem;
}
.hero {
    text-align: center;
    padding: clamp(2rem, 8vw, 4rem) 0;
    margin-bottom: 3rem;
}
.hero h1 {
    font-size: clamp(2rem, 6vw, 3.25rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1.25rem;
    background: linear-gradient(
        135deg,
        var(--text-primary) 0%,
        var(--accent) 50%,
        var(--text-primary) 100%
    );
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 8s ease infinite;
}
@keyframes gradientShift {
    0%,
    100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}
.hero p {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}
.hero-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.hero-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.hero-meta svg {
    width: 18px;
    height: 18px;
    color: var(--accent);
}
.day-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    margin-bottom: 3rem;
}
.day-card {
    background: var(--bg-glass);
    backdrop-filter: var(--blur-md);
    -webkit-backdrop-filter: var(--blur-md);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 1.5rem;
    text-decoration: none;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.day-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}
.day-card .day-num {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 0.3rem 0.75rem;
    border-radius: 20px;
    width: fit-content;
}
.day-card h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin: 0;
}
.day-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
}
.day-card .topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: auto;
}
.day-card .topic {
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    background: var(--bg-tertiary);
    border-radius: 4px;
    color: var(--text-muted);
}
.page-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    margin-top: 3rem;
    border-top: 1px solid var(--border);
}
.page-nav a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.75rem 1.25rem;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 10px;
    transition: all 0.2s ease;
    font-size: 0.9rem;
}
.page-nav a:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-soft);
}
.page-nav a svg {
    width: 18px;
    height: 18px;
}
.page-nav .disabled {
    opacity: 0.4;
    pointer-events: none;
}
.day-section {
    position: relative;
}
.day-header {
    margin-bottom: 2.5rem;
}
.day-label {
    display: inline-block;
    background: var(--accent-soft);
    color: var(--accent);
    padding: 0.35rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    border: 1px solid rgba(74, 158, 255, 0.2);
}
.day-header h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1.3;
}
.day-header > p {
    color: var(--text-secondary);
    font-size: 1rem;
}
h3 {
    font-size: clamp(1.15rem, 3vw, 1.35rem);
    font-weight: 600;
    margin: 2.5rem 0 1.25rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
h3::before {
    content: "";
    width: 4px;
    height: 1.2em;
    background: var(--accent);
    border-radius: 2px;
}
h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}
p {
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}
strong {
    color: var(--accent);
    font-weight: 600;
}
em {
    color: var(--text-secondary);
    font-style: italic;
}
a {
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.2s;
}
a:hover {
    opacity: 0.8;
}
.glass-box {
    background: var(--bg-glass);
    backdrop-filter: var(--blur-md);
    -webkit-backdrop-filter: var(--blur-md);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: clamp(1.25rem, 3vw, 1.75rem);
    margin: 1.75rem 0;
}
.concept-box {
    background: var(--bg-glass);
    backdrop-filter: var(--blur-md);
    -webkit-backdrop-filter: var(--blur-md);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: clamp(1.25rem, 3vw, 1.75rem);
    margin: 1.75rem 0;
}
.concept-box h4 {
    margin-top: 0;
    color: var(--accent);
    font-size: 1rem;
    margin-bottom: 1rem;
}
.concept-box p:last-child {
    margin-bottom: 0;
}
.analogy {
    background: linear-gradient(
        135deg,
        var(--accent-soft),
        rgba(74, 158, 255, 0.05)
    );
    border-left: 4px solid var(--accent);
    padding: clamp(1rem, 3vw, 1.5rem);
    margin: 1.75rem 0;
    border-radius: 0 14px 14px 0;
}
.analogy-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.75rem;
}
.analogy p:last-child {
    margin-bottom: 0;
}
.important {
    background: linear-gradient(
        135deg,
        var(--warning-soft),
        rgba(251, 191, 36, 0.05)
    );
    border-left: 4px solid var(--warning);
    padding: clamp(1rem, 3vw, 1.5rem);
    margin: 1.75rem 0;
    border-radius: 0 14px 14px 0;
}
.important-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--warning);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.75rem;
}
.important p:last-child {
    margin-bottom: 0;
}
.success-box {
    background: linear-gradient(
        135deg,
        var(--success-soft),
        rgba(52, 211, 153, 0.05)
    );
    border-left: 4px solid var(--success);
    padding: clamp(1rem, 3vw, 1.5rem);
    margin: 1.75rem 0;
    border-radius: 0 14px 14px 0;
}
.code-block {
    position: relative;
    margin: 1.25rem 0;
}
.code-block pre {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: clamp(1rem, 3vw, 1.5rem);
    padding-top: 3.25rem;
    overflow-x: auto;
    font-family: var(--font-code);
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    line-height: 1.7;
    -webkit-overflow-scrolling: touch;
    margin: 0;
}
.code-block pre code {
    display: block;
    padding-top: 0.75rem;
}
.code-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border);
    border-radius: 12px 12px 0 0;
}
.code-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-code);
}
.copy-btn {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.65rem;
    background: var(--bg-glass-light);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.7rem;
    cursor: pointer;
    transition: all 0.2s ease;
}
.copy-btn:hover {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: var(--accent);
}
.copy-btn.copied {
    background: var(--success-soft);
    color: var(--success);
    border-color: var(--success);
}
.copy-btn svg {
    width: 14px;
    height: 14px;
}
pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
    font-size: inherit;
}
code {
    font-family: var(--font-code);
    background: var(--bg-tertiary);
    padding: 0.2rem 0.5rem;
    border-radius: 5px;
    font-size: 0.88em;
    color: var(--accent);
}
.keyword {
    color: #ff7b72;
}
.string {
    color: #a5d6ff;
}
.comment {
    color: #6e7681;
    font-style: italic;
}
.function {
    color: #d2a8ff;
}
.number {
    color: #79c0ff;
}
.variable {
    color: #ffa657;
}
[data-theme="cloud"] .keyword {
    color: #ff6b6b;
}
[data-theme="cloud"] .string {
    color: #7ec8e3;
}
[data-theme="cloud"] .comment {
    color: #8b9eb0;
    font-style: italic;
}
[data-theme="cloud"] .function {
    color: #c4a7e7;
}
[data-theme="cloud"] .number {
    color: #7cb7ff;
}
[data-theme="cloud"] .variable {
    color: #ffb366;
}
[data-theme="cloud"] pre code {
    color: #e8eaed;
}
[data-theme="sand"] .keyword {
    color: #ff7b7b;
}
[data-theme="sand"] .string {
    color: #7ec8e3;
}
[data-theme="sand"] .comment {
    color: #9ca3af;
    font-style: italic;
}
[data-theme="sand"] .function {
    color: #c9a7eb;
}
[data-theme="sand"] .number {
    color: #7cb7ff;
}
[data-theme="sand"] .variable {
    color: #ffb366;
}
[data-theme="sand"] pre code {
    color: #e8eaed;
}
ul,
ol {
    margin: 1.25rem 0;
    padding-left: 1.5rem;
}
li {
    margin-bottom: 0.6rem;
    color: var(--text-primary);
}
li::marker {
    color: var(--accent);
}
.diagram {
    background: var(--bg-glass);
    backdrop-filter: var(--blur-sm);
    -webkit-backdrop-filter: var(--blur-sm);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: clamp(1.25rem, 4vw, 2rem);
    margin: 1.75rem 0;
    overflow-x: auto;
}
.diagram pre {
    background: none;
    border: none;
    padding: 0;
    margin: 0;
    text-align: center;
    font-size: clamp(0.75rem, 2vw, 0.9rem);
}
.steps {
    counter-reset: step;
    margin: 1.75rem 0;
}
.step {
    position: relative;
    padding-left: 3.5rem;
    margin-bottom: 1.75rem;
}
.step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 0;
    width: 2.5rem;
    height: 2.5rem;
    background: var(--accent-soft);
    color: var(--accent);
    border: 1px solid rgba(74, 158, 255, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.95rem;
}
.step p:last-child {
    margin-bottom: 0;
}
.project-box {
    background: var(--bg-glass);
    backdrop-filter: var(--blur-md);
    -webkit-backdrop-filter: var(--blur-md);
    border: 2px solid rgba(74, 158, 255, 0.3);
    border-radius: 16px;
    padding: clamp(1.25rem, 4vw, 2rem);
    margin: 2rem 0;
}
.project-label {
    display: inline-block;
    background: var(--accent-soft);
    color: var(--accent);
    padding: 0.3rem 0.85rem;
    border-radius: 6px;
    font-size: 0.78rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.project-box h4 {
    margin-top: 0;
    margin-bottom: 1rem;
    font-size: 1.15rem;
}
.project-box ul {
    margin-bottom: 0;
}
.project-box p:last-child {
    margin-bottom: 0;
}
.video-resources {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin: 1.5rem 0;
}
.video-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.2s ease;
}
.video-link:hover {
    border-color: var(--accent);
    background: var(--accent-soft);
}
.video-link .video-icon {
    width: 48px;
    height: 48px;
    background: var(--error);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.video-link .video-icon svg {
    width: 24px;
    height: 24px;
    color: #fff;
}
.video-link .video-info {
    flex: 1;
}
.video-link .video-title {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 0.25rem;
}
.video-link .video-channel {
    font-size: 0.8rem;
    color: var(--text-muted);
}
.mcq-section {
    background: var(--bg-glass);
    backdrop-filter: var(--blur-md);
    -webkit-backdrop-filter: var(--blur-md);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: clamp(1.25rem, 4vw, 2rem);
    margin: 2.5rem 0;
}
.mcq-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}
.mcq-header h4 {
    margin: 0;
    font-size: 1.05rem;
}
.mcq-icon {
    width: 32px;
    height: 32px;
    background: var(--accent-soft);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.mcq-icon svg {
    width: 18px;
    height: 18px;
    color: var(--accent);
}
.question {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}
.question:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}
.question-text {
    font-weight: 500;
    margin-bottom: 1rem;
    font-size: 1rem;
    line-height: 1.6;
}
.options {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}
.option {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}
.option:hover:not(.answered) {
    border-color: var(--accent);
    background: var(--accent-soft);
}
.option.selected {
    border-color: var(--accent);
    background: var(--accent-soft);
}
.option.correct {
    border-color: var(--success);
    background: var(--success-soft);
}
.option.incorrect {
    border-color: var(--error);
    background: var(--error-soft);
}
.option.answered {
    cursor: default;
}
.option-marker {
    width: 28px;
    height: 28px;
    min-width: 28px;
    border-radius: 50%;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}
.option.correct .option-marker {
    background: var(--success);
    border-color: var(--success);
    color: #fff;
}
.option.incorrect .option-marker {
    background: var(--error);
    border-color: var(--error);
    color: #fff;
}
.option-text {
    flex: 1;
    font-size: 0.95rem;
    color: var(--text-primary);
}
.feedback {
    margin-top: 1rem;
    padding: 1rem 1.25rem;
    border-radius: 10px;
    font-size: 0.92rem;
    display: none;
    line-height: 1.6;
}
.feedback.show {
    display: block;
}
.feedback.correct {
    background: var(--success-soft);
    color: var(--success);
    border: 1px solid rgba(52, 211, 153, 0.3);
}
.feedback.incorrect {
    background: var(--error-soft);
    color: var(--error);
    border: 1px solid rgba(248, 113, 113, 0.3);
}
.feedback strong {
    color: inherit;
}
.bookmark-indicator {
    position: fixed;
    width: 6px;
    height: 50px;
    background: var(--warning);
    border-radius: 0 6px 6px 0;
    left: 0;
    cursor: grab;
    z-index: 100;
    transition: transform 0.2s ease, opacity 0.2s ease;
    box-shadow: 0 0 15px var(--warning);
}
.bookmark-indicator:hover {
    transform: scaleX(1.5);
}
.bookmark-indicator.dragging {
    cursor: grabbing;
    opacity: 0.8;
}
.bookmark-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    font-size: 0.9rem;
    color: var(--text-primary);
    z-index: 9999;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: opacity 0.3s ease;
}
.bookmark-toast.show {
    opacity: 1;
}
.bookmark-toast svg {
    width: 18px;
    height: 18px;
    color: var(--warning);
}
.scroll-progress {
    position: fixed;
    top: 72px;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent));
    z-index: 999;
    transition: width 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: width;
}
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.page-loader.active {
    opacity: 1;
    visibility: visible;
}
.loader-spinner {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    position: relative;
    animation: loaderRotate 1s linear infinite;
}
.loader-spinner::before,
.loader-spinner::after {
    content: "";
    position: absolute;
    border-radius: 50%;
}
.loader-spinner::before {
    width: 100%;
    height: 100%;
    background: linear-gradient(0deg, transparent 33%, var(--accent) 100%);
    mask: radial-gradient(
        farthest-side,
        transparent calc(100% - 6px),
        #000 calc(100% - 6px)
    );
    -webkit-mask: radial-gradient(
        farthest-side,
        transparent calc(100% - 6px),
        #000 calc(100% - 6px)
    );
}
.loader-spinner::after {
    width: 6px;
    height: 6px;
    background: var(--accent);
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    box-shadow: 0 0 10px var(--accent);
}
@keyframes loaderRotate {
    100% {
        transform: rotate(360deg);
    }
}
[data-theme="midnight"] .loader-spinner::before {
    background: linear-gradient(0deg, transparent 33%, #4a9eff 100%);
}
[data-theme="midnight"] .loader-spinner::after {
    background: #4a9eff;
    box-shadow: 0 0 15px #4a9eff;
}
[data-theme="forest"] .loader-spinner::before {
    background: linear-gradient(0deg, transparent 33%, #34d399 100%);
}
[data-theme="forest"] .loader-spinner::after {
    background: #34d399;
    box-shadow: 0 0 15px #34d399;
}
[data-theme="sunset"] .loader-spinner::before {
    background: linear-gradient(0deg, transparent 33%, #f97316 100%);
}
[data-theme="sunset"] .loader-spinner::after {
    background: #f97316;
    box-shadow: 0 0 15px #f97316;
}
[data-theme="purple"] .loader-spinner::before {
    background: linear-gradient(0deg, transparent 33%, #a78bfa 100%);
}
[data-theme="purple"] .loader-spinner::after {
    background: #a78bfa;
    box-shadow: 0 0 15px #a78bfa;
}
[data-theme="ocean"] .loader-spinner::before {
    background: linear-gradient(0deg, transparent 33%, #06b6d4 100%);
}
[data-theme="ocean"] .loader-spinner::after {
    background: #06b6d4;
    box-shadow: 0 0 15px #06b6d4;
}
[data-theme="crimson"] .loader-spinner::before {
    background: linear-gradient(0deg, transparent 33%, #ef4444 100%);
}
[data-theme="crimson"] .loader-spinner::after {
    background: #ef4444;
    box-shadow: 0 0 15px #ef4444;
}
[data-theme="cloud"] .loader-spinner::before {
    background: linear-gradient(0deg, transparent 33%, #3b82f6 100%);
}
[data-theme="cloud"] .loader-spinner::after {
    background: #3b82f6;
    box-shadow: 0 0 15px #3b82f6;
}
[data-theme="sand"] .loader-spinner::before {
    background: linear-gradient(0deg, transparent 33%, #d97706 100%);
}
[data-theme="sand"] .loader-spinner::after {
    background: #d97706;
    box-shadow: 0 0 15px #d97706;
}
footer {
    text-align: center;
    padding: 2.5rem clamp(1rem, 4vw, 2rem);
    border-top: 1px solid var(--border);
    margin-top: 2rem;
}
footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}
footer p:last-child {
    margin-bottom: 0;
}
.completion-box {
    background: linear-gradient(
        135deg,
        var(--success-soft),
        rgba(52, 211, 153, 0.05)
    );
    border: 2px solid rgba(52, 211, 153, 0.3);
    border-radius: 16px;
    padding: clamp(1.5rem, 4vw, 2rem);
    margin: 2.5rem 0;
}
.completion-box h4 {
    color: var(--success);
    margin-top: 0;
}
.page-transition {
    animation: pageIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
@keyframes pageIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.page-nav a {
    position: relative;
    overflow: hidden;
    transform: translateY(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), color 0.3s ease,
        border-color 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
}
.page-nav a:active {
    transform: scale(0.97);
}
.page-nav a::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: var(--accent-soft);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.4s ease, height 0.4s ease;
    opacity: 0.5;
}
.page-nav a:active::after {
    width: 200%;
    height: 200%;
}
.nav-links a {
    position: relative;
    overflow: hidden;
}
.nav-links a::before {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease, left 0.3s ease;
}
.nav-links a.active::before,
.nav-links a:active::before {
    width: 100%;
    left: 0;
}
.mobile-menu a {
    transform: translateX(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), color 0.3s ease,
        background 0.3s ease, border-color 0.3s ease;
}
.mobile-menu a:active {
    transform: scale(0.98);
}
.bookmark-btn {
    position: relative;
    overflow: hidden;
}
.bookmark-btn svg {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.bookmark-btn:active svg {
    transform: scale(0.85);
}
.bookmark-btn.has-bookmark svg {
    animation: bookmarkPulse 0.5s ease;
}
@keyframes bookmarkPulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
    }
}
.bookmark-btn::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: var(--warning);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s ease, height 0.3s ease;
    opacity: 0.3;
}
.bookmark-btn:active::after {
    width: 150%;
    height: 150%;
}
.settings-panel {
    transform: translateX(100%);
    opacity: 0;
    display: flex !important;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s ease;
    pointer-events: none;
}
.settings-panel.active {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
}
.mobile-menu {
    transform: translateY(-20px);
    opacity: 0;
    display: flex !important;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
    pointer-events: none;
}
.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}
.settings-opt {
    transform: scale(1);
    transition: transform 0.2s ease, border-color 0.2s ease,
        background 0.2s ease, color 0.2s ease;
}
.settings-opt:active {
    transform: scale(0.95);
}
.font-size-btn {
    transform: scale(1);
    transition: transform 0.15s ease, background 0.2s ease, color 0.2s ease,
        border-color 0.2s ease;
}
.font-size-btn:active:not(:disabled) {
    transform: scale(0.9);
}
.copy-btn {
    transform: scale(1);
    transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease,
        border-color 0.2s ease;
}
.copy-btn:active {
    transform: scale(0.92);
}
.day-card {
    transform: translateY(0) scale(1);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1),
        border-color 0.3s ease, box-shadow 0.3s ease;
}
.day-card:active {
    transform: translateY(-2px) scale(0.99);
}
.option {
    transform: scale(1);
    transition: transform 0.2s ease, border-color 0.2s ease,
        background 0.2s ease;
}
.option:active:not(.answered) {
    transform: scale(0.98);
}
.video-link {
    transform: scale(1);
    transition: transform 0.2s ease, border-color 0.2s ease,
        background 0.2s ease;
}
.video-link:active {
    transform: scale(0.98);
}
.hamburger {
    transform: scale(1);
    transition: transform 0.2s ease, background 0.2s ease,
        border-color 0.2s ease;
}
.hamburger:active {
    transform: scale(0.92);
}
.bookmark-indicator {
    transition: transform 0.2s ease, opacity 0.2s ease, box-shadow 0.3s ease;
}
.bookmark-toast {
    transform: translateX(-50%) translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.bookmark-toast.show {
    transform: translateX(-50%) translateY(0);
}
.container {
    animation: containerIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
@keyframes containerIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}
.nav-btn {
    transform: scale(1);
    transition: transform 0.2s ease, background 0.3s ease, color 0.3s ease,
        border-color 0.3s ease;
}
.nav-btn:active {
    transform: scale(0.9);
}
.bookmark-actions button {
    transform: scale(1);
    transition: transform 0.15s ease, background 0.2s ease, color 0.2s ease,
        border-color 0.2s ease;
}
.bookmark-actions button:active {
    transform: scale(0.95);
}
@media (max-width: 1024px) {
    .brand-logo-wrapper {
        display: none;
    }

    .nav-center {
        max-width: calc(100% - 240px);
    }

    .nav-pill {
        position: relative;
        max-width: 100%;
        overflow: hidden;
        padding: 6px 4px;
    }

    .nav-links {
        overflow-x: auto;
        overflow-y: hidden;
        scroll-behavior: smooth;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
        padding: 0 4px;
        mask-image: linear-gradient(
            to right,
            transparent 0%,
            black 8%,
            black 92%,
            transparent 100%
        );
        -webkit-mask-image: linear-gradient(
            to right,
            transparent 0%,
            black 8%,
            black 92%,
            transparent 100%
        );
    }

    .nav-links::-webkit-scrollbar {
        display: none;
    }

    .nav-links a {
        padding: 7px 12px;
        font-size: 0.8rem;
    }
    .nav-pill.idle .nav-links {
        opacity: 0.85;
        transition: opacity 0.5s ease;
    }

    .nav-pill:hover .nav-links,
    .nav-pill.scrolling .nav-links {
        opacity: 1;
    }

    .settings-panel {
        width: 280px;
    }
}
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    .nav-center {
        display: none;
    }
    .hamburger {
        display: flex;
    }
    .brand-logo-wrapper {
        display: none;
    }
    .container {
        padding-top: calc(72px + 1.5rem);
    }
    .hero {
        padding: clamp(1.5rem, 6vw, 3rem) 0;
    }
    .day-grid {
        grid-template-columns: 1fr;
    }
    .day-section {
        margin-bottom: 3rem;
        padding-bottom: 2.5rem;
    }
    .step {
        padding-left: 3rem;
    }
    .step::before {
        width: 2.25rem;
        height: 2.25rem;
        font-size: 0.9rem;
    }
    .settings-panel {
        width: 100%;
        max-width: 100%;
        border-left: none;
        border-top: 1px solid var(--border);
    }
}
@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    .nav {
        padding: 0 1rem;
    }
    .nav-brand {
        font-size: 1rem;
    }
    .nav-btn,
    .hamburger {
        width: 36px;
        height: 36px;
    }
    .container {
        padding: calc(72px + 1rem) 1rem 2rem;
    }
    .glass-box,
    .concept-box,
    .analogy,
    .important,
    .success-box,
    .mcq-section,
    .project-box,
    .diagram {
        padding: 1rem;
        border-radius: 12px;
    }
    .code-header {
        padding: 0.4rem 0.75rem;
    }
    .option {
        padding: 0.85rem 1rem;
        gap: 0.75rem;
    }
    .option-marker {
        width: 24px;
        height: 24px;
        min-width: 24px;
        font-size: 0.8rem;
    }
    .step {
        padding-left: 2.75rem;
    }
    .step::before {
        width: 2rem;
        height: 2rem;
        font-size: 0.85rem;
    }
    .video-link {
        padding: 0.85rem;
    }
    .video-link .video-icon {
        width: 40px;
        height: 40px;
    }
    .page-nav {
        flex-direction: column;
        gap: 1rem;
    }
    .page-nav a {
        width: 100%;
        justify-content: center;
    }
}
@media (max-width: 360px) {
    .hero h1 {
        font-size: 1.75rem;
    }
    .day-header h2 {
        font-size: 1.35rem;
    }
    h3 {
        font-size: 1.1rem;
    }
}
@media (hover: none) {
    .option:hover:not(.answered) {
        border-color: var(--border);
        background: var(--bg-tertiary);
    }
    .day-card:hover {
        transform: none;
    }
    .nav-links a:hover {
        background: transparent;
        color: var(--text-secondary);
    }
    .nav-links a.active {
        color: var(--accent);
        background: var(--accent-soft);
    }
}
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .scroll-progress {
        transition: none;
    }
    .settings-panel,
    .mobile-menu {
        transition: none;
    }
    .container {
        animation: none;
    }
}
.settings-panel,
.mobile-menu,
.scroll-progress,
.page-nav a,
.nav-btn,
.bookmark-btn,
.day-card {
    will-change: transform, opacity;
}
.container,
.day-section,
.concept-box,
.analogy,
.important,
.mcq-section,
.project-box {
    will-change: opacity, transform;
}
@media print {
    .nav,
    .hamburger,
    .mobile-menu,
    .nav-btn,
    .bookmark-indicator,
    .scroll-progress,
    .settings-panel {
        display: none !important;
    }
    .container {
        padding-top: 1rem;
    }
    body::before,
    body::after {
        display: none;
    }
    .glass-box,
    .concept-box,
    .mcq-section,
    .project-box,
    .diagram {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        background: #1a1a2e;
    }
}