/* AI Learning Hub - Complete Styles */

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

:root {
    --primary-bg: #000000;
    --secondary-bg: #1d1d1f;
    --tertiary-bg: #2d2d2f;
    --accent-blue: #0071e3;
    --accent-purple: #bf5af2;
    --accent-green: #30d158;
    --accent-amber: #ffd60a;
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-muted: #6e6e73;
    --border-color: #424245;
    --border-soft: #2a2a2c;
    --card-bg: rgba(255, 255, 255, 0.04);
    --card-hover: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(18, 18, 20, 0.75);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.5);
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 22px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', sans-serif;
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.skip-link {
    position: absolute; left: -9999px; top: 0;
    background: var(--accent-blue); color: white;
    padding: 0.75rem 1rem; border-radius: var(--radius-sm);
    z-index: 10000;
}
.skip-link:focus { left: 1rem; top: 1rem; }

/* -------- Navigation -------- */
.nav {
    position: fixed; top: 0; left: 0; right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border-soft);
    z-index: 1000; padding: 0.85rem 0;
    transition: transform 0.3s ease;
}
.nav-content {
    max-width: 1280px; margin: 0 auto; padding: 0 1.5rem;
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    gap: 1.5rem; align-items: center;
}
.nav-logo {
    font-size: 1.05rem; font-weight: 600;
    color: var(--text-primary); text-decoration: none;
    display: inline-flex; align-items: center; gap: 0.5rem;
    white-space: nowrap;
}
.logo-mark { color: var(--accent-blue); font-size: 1.1rem; }
.nav-links { display: flex; gap: 1.5rem; }
.nav-link {
    color: var(--text-secondary); text-decoration: none;
    font-size: 0.92rem; font-weight: 500;
    transition: color 0.2s;
    padding: 0.25rem 0;
}
.nav-link:hover, .nav-link.active { color: var(--text-primary); }
.nav-mobile {
    display: none; background: transparent; border: none;
    color: var(--text-primary); font-size: 1.4rem; cursor: pointer;
}

/* Search */
.nav-search { position: relative; max-width: 420px; }
#global-search {
    width: 100%; padding: 0.55rem 0.9rem 0.55rem 2.1rem;
    background: var(--tertiary-bg);
    border: 1px solid var(--border-soft);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.9rem;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23a1a1a6' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'><circle cx='11' cy='11' r='7'/><path d='m20 20-3-3'/></svg>");
    background-repeat: no-repeat; background-position: 0.7rem center;
}
#global-search:focus { outline: none; border-color: var(--accent-blue); }
.search-results {
    position: absolute; top: calc(100% + 6px); left: 0; right: 0;
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    max-height: 420px; overflow-y: auto;
    box-shadow: var(--shadow-lg);
    z-index: 1001;
}
.search-item {
    padding: 0.85rem 1rem; cursor: pointer;
    border-bottom: 1px solid var(--border-soft);
    display: flex; gap: 0.8rem; align-items: center;
}
.search-item:last-child { border-bottom: none; }
.search-item:hover, .search-item.active { background: var(--card-hover); }
.search-icon { font-size: 1.1rem; flex-shrink: 0; }
.search-main { flex: 1; min-width: 0; }
.search-title { font-size: 0.9rem; color: var(--text-primary); font-weight: 500; }
.search-sub { font-size: 0.75rem; color: var(--text-muted); margin-top: 2px; }
.search-type {
    font-size: 0.65rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--accent-blue);
    background: rgba(0,113,227,0.14); padding: 0.2rem 0.55rem;
    border-radius: 6px; flex-shrink: 0;
}
.search-empty { padding: 1.2rem; text-align: center; color: var(--text-muted); font-size: 0.88rem; }

/* -------- Hero -------- */
.hero {
    min-height: 100vh;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    text-align: center; padding: 6rem 1.5rem 4rem;
    background:
        radial-gradient(ellipse 60% 40% at 50% 0%, rgba(0, 113, 227, 0.22), transparent 60%),
        radial-gradient(ellipse 50% 30% at 80% 40%, rgba(191, 90, 242, 0.12), transparent 60%);
    position: relative;
}
.hero-badge {
    display: inline-block;
    font-size: 0.75rem; font-weight: 600;
    letter-spacing: 0.15em; text-transform: uppercase;
    color: var(--text-secondary);
    padding: 0.4rem 0.9rem; margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    background: rgba(255,255,255,0.03);
}
.hero-title {
    font-size: clamp(2.6rem, 6vw, 5.5rem);
    font-weight: 700; letter-spacing: -0.03em;
    margin-bottom: 1.25rem; line-height: 1.05;
}
.hero-title .grad {
    background: linear-gradient(120deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: clamp(1.05rem, 1.8vw, 1.35rem);
    color: var(--text-secondary); margin-bottom: 2.5rem;
    max-width: 640px;
}
.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; margin-bottom: 3.5rem; }
.cta-button {
    background: var(--accent-blue); color: white; border: none;
    padding: 0.95rem 2.1rem; border-radius: 14px;
    font-size: 1rem; font-weight: 600; cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}
.cta-button:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(0,113,227,0.35); }
.cta-ghost {
    background: transparent; color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.cta-ghost:hover { background: var(--card-hover); box-shadow: none; }

.hero-stats {
    display: grid; grid-template-columns: repeat(4, auto);
    gap: 3rem; margin-top: 1rem;
}
.hero-stats > div { display: flex; flex-direction: column; align-items: center; }
.hero-stats strong {
    font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 700;
    background: linear-gradient(120deg, var(--text-primary), var(--accent-blue));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-stats span { font-size: 0.78rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.1em; margin-top: 0.25rem; }

.scroll-indicator { position: absolute; bottom: 2rem; animation: bounce 2s infinite; }
.scroll-arrow { width: 20px; height: 20px; border-right: 2px solid var(--text-secondary); border-bottom: 2px solid var(--text-secondary); transform: rotate(45deg); }
@keyframes bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(8px); } }

@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { animation: fadeIn 0.8s ease-out; }
.fade-in-delay { animation: fadeIn 0.8s ease-out 0.2s backwards; }
.fade-in-delay-2 { animation: fadeIn 0.8s ease-out 0.4s backwards; }

/* -------- Daily update -------- */
.daily-update { background: linear-gradient(90deg, var(--accent-purple), var(--accent-blue)); padding: 1.1rem 1.5rem; text-align: center; }
.update-content { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; justify-content: center; gap: 1.2rem; flex-wrap: wrap; }
.update-badge { background: rgba(255,255,255,0.25); padding: 0.22rem 0.7rem; border-radius: 20px; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; }
.update-text { flex: 1; font-size: 0.92rem; max-width: 720px; }
.update-date { font-size: 0.78rem; opacity: 0.8; }

/* -------- Section headers -------- */
.section-header { text-align: center; margin-bottom: 3rem; }
.section-title { font-size: clamp(1.8rem, 3.5vw, 2.75rem); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 0.6rem; }
.section-subtitle { font-size: 1.05rem; color: var(--text-secondary); }

/* -------- Path cards -------- */
.path-selection { padding: 5rem 1.5rem; max-width: 1280px; margin: 0 auto; }
.path-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.path-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.25rem 2rem 4rem;
    cursor: pointer;
    transition: transform 0.3s, background 0.3s, border-color 0.3s;
    position: relative;
}
.path-card:hover, .path-card:focus {
    background: var(--card-hover);
    transform: translateY(-6px);
    border-color: rgba(0,113,227,0.5);
    outline: none;
}
.card-icon { font-size: 2.5rem; margin-bottom: 1.2rem; }
.card-title { font-size: 1.5rem; font-weight: 600; margin-bottom: 0.8rem; letter-spacing: -0.01em; }
.card-description { color: var(--text-secondary); margin-bottom: 1.4rem; }
.card-features { list-style: none; margin-bottom: 1.5rem; }
.card-features li { padding: 0.35rem 0 0.35rem 1.5rem; color: var(--text-secondary); position: relative; font-size: 0.93rem; }
.card-features li::before { content: '✓'; position: absolute; left: 0; color: var(--accent-green); font-weight: 700; }
.card-meta { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.pill { font-size: 0.72rem; padding: 0.3rem 0.7rem; border-radius: 999px; background: rgba(255,255,255,0.06); color: var(--text-secondary); border: 1px solid var(--border-soft); }
.card-arrow { font-size: 1.5rem; color: var(--accent-blue); position: absolute; right: 1.75rem; bottom: 1.5rem; }

/* -------- Featured -------- */
.featured { padding: 3rem 1.5rem 5rem; max-width: 1280px; margin: 0 auto; }
.featured-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; }
.featured-card {
    background: var(--card-bg);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-md);
    padding: 1.4rem;
    cursor: pointer;
    transition: all 0.25s;
}
.featured-card:hover { background: var(--card-hover); transform: translateY(-3px); border-color: var(--accent-blue); }
.featured-level {
    display: inline-block; font-size: 0.68rem; font-weight: 700;
    letter-spacing: 0.1em; text-transform: uppercase;
    padding: 0.2rem 0.55rem; border-radius: 6px;
    margin-bottom: 0.75rem;
}
.level-beginner { background: rgba(48,209,88,0.15); color: var(--accent-green); }
.level-intermediate { background: rgba(0,113,227,0.15); color: var(--accent-blue); }
.level-expert { background: rgba(191,90,242,0.15); color: var(--accent-purple); }
.featured-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.5rem; display: flex; gap: 0.5rem; align-items: center; }
.featured-desc { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.55; }

/* -------- Learning content -------- */
.learning-content { padding: 5rem 1.5rem; max-width: 1280px; margin: 0 auto; }
.back-button { background: var(--card-bg); border: 1px solid var(--border-color); color: var(--text-primary); padding: 0.6rem 1.25rem; border-radius: 10px; cursor: pointer; margin-bottom: 1.5rem; font-size: 0.9rem; }
.back-button:hover { background: var(--card-hover); }
.content-header { margin-bottom: 2rem; }
.content-title { font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 0.4rem; }
.content-subtitle { color: var(--text-secondary); }

.progress-tracker { background: var(--card-bg); border: 1px solid var(--border-soft); border-radius: var(--radius-md); padding: 1.2rem 1.5rem; margin-bottom: 1.5rem; }
.progress-bar { width: 100%; height: 6px; background: var(--tertiary-bg); border-radius: 4px; overflow: hidden; margin-bottom: 0.7rem; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple)); transition: width 0.5s; width: 0%; }
.progress-text { font-size: 0.85rem; color: var(--text-secondary); }

.topic-controls { display: flex; gap: 0.5rem; margin-bottom: 2rem; flex-wrap: wrap; }
.filter-chip {
    background: var(--card-bg); border: 1px solid var(--border-soft);
    color: var(--text-secondary);
    padding: 0.5rem 1rem; border-radius: 999px;
    font-size: 0.85rem; cursor: pointer;
    transition: all 0.2s;
}
.filter-chip:hover { background: var(--card-hover); color: var(--text-primary); }
.filter-chip.active { background: var(--accent-blue); border-color: var(--accent-blue); color: white; }

.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; }
.topic-card {
    background: var(--card-bg);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    cursor: pointer;
    transition: all 0.25s;
    position: relative;
}
.topic-card:hover, .topic-card:focus { background: var(--card-hover); transform: translateY(-3px); border-color: var(--accent-blue); outline: none; }
.topic-completed { border-color: var(--accent-green) !important; background: rgba(48,209,88,0.04); }
.topic-completed::after { content: '✓'; position: absolute; top: 0.9rem; right: 1rem; color: var(--accent-green); font-weight: 700; font-size: 1.05rem; }
.topic-number { font-size: 0.7rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 0.4rem; }
.topic-icon { font-size: 2rem; margin-bottom: 0.9rem; }
.topic-title { font-size: 1.2rem; font-weight: 600; margin-bottom: 0.6rem; letter-spacing: -0.01em; }
.topic-description { color: var(--text-secondary); margin-bottom: 1rem; font-size: 0.92rem; }
.topic-meta { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.topic-badge { font-size: 0.7rem; padding: 0.25rem 0.6rem; border-radius: 6px; background: rgba(255,255,255,0.05); color: var(--text-secondary); border: 1px solid var(--border-soft); }

.empty-state { text-align: center; padding: 4rem 1rem; color: var(--text-secondary); }
.empty-icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state h3 { font-size: 1.25rem; margin-bottom: 0.4rem; color: var(--text-primary); }

/* -------- Updates / About -------- */
.updates { padding: 5rem 1.5rem; max-width: 1280px; margin: 0 auto; }
.updates-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.25rem; }
.update-card {
    background: var(--card-bg); border: 1px solid var(--border-soft);
    border-radius: var(--radius-md); padding: 1.5rem;
    transition: all 0.25s;
}
.update-card:hover { background: var(--card-hover); }
.update-card-date { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; color: var(--accent-blue); text-transform: uppercase; margin-bottom: 0.5rem; }
.update-card-title { font-size: 1.05rem; font-weight: 600; margin-bottom: 0.4rem; }
.update-card-text { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; }

.about { padding: 5rem 1.5rem; max-width: 820px; margin: 0 auto; }
.about-inner { text-align: center; }
.about-inner p { color: var(--text-secondary); font-size: 1.05rem; margin: 1.5rem auto 2rem; line-height: 1.75; }
.about-points { list-style: none; text-align: left; display: grid; gap: 0.8rem; max-width: 560px; margin: 0 auto; }
.about-points li { padding: 1rem 1.2rem; background: var(--card-bg); border: 1px solid var(--border-soft); border-radius: var(--radius-sm); color: var(--text-secondary); }
.about-points strong { color: var(--text-primary); }

/* -------- Footer -------- */
.site-footer { border-top: 1px solid var(--border-soft); padding: 2rem 1.5rem; margin-top: 3rem; }
.footer-inner { max-width: 1280px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; color: var(--text-muted); font-size: 0.85rem; gap: 1rem; flex-wrap: wrap; }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { color: var(--text-secondary); text-decoration: none; }
.footer-links a:hover { color: var(--text-primary); }

/* -------- Modal -------- */
.modal { position: fixed; inset: 0; z-index: 2000; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.modal-overlay { position: absolute; inset: 0; background: rgba(0, 0, 0, 0.82); backdrop-filter: blur(4px); }
.modal-content {
    position: relative; background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    max-width: 900px; width: 100%;
    max-height: 90vh; overflow-y: auto;
    padding: 2.5rem; box-shadow: var(--shadow-lg);
}
.modal-close { position: absolute; top: 1.25rem; right: 1.25rem; background: var(--tertiary-bg); border: none; color: var(--text-primary); width: 36px; height: 36px; border-radius: 50%; font-size: 1.3rem; cursor: pointer; line-height: 1; }
.modal-close:hover { background: var(--card-hover); }
.modal-header { margin-bottom: 2rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--border-soft); }
.modal-title { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 700; margin-bottom: 0.5rem; letter-spacing: -0.02em; }
.modal-subtitle { color: var(--text-secondary); font-size: 0.98rem; }
.modal-section { margin-bottom: 2rem; }
.modal-section h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 1rem; color: var(--accent-blue); }
.modal-section p { color: var(--text-secondary); line-height: 1.8; }
.modal-section ul { padding-left: 1.25rem; color: var(--text-secondary); line-height: 1.9; }

.modal-footer {
    display: flex; gap: 0.75rem; justify-content: space-between;
    padding-top: 1.5rem; margin-top: 1rem;
    border-top: 1px solid var(--border-soft);
    flex-wrap: wrap;
}
.btn-primary, .btn-secondary {
    padding: 0.7rem 1.4rem; border-radius: 10px;
    font-size: 0.92rem; font-weight: 600; cursor: pointer;
    border: 1px solid transparent; transition: all 0.2s;
}
.btn-primary { background: var(--accent-blue); color: white; }
.btn-primary:hover { filter: brightness(1.1); }
.btn-primary.completed { background: var(--accent-green); }
.btn-secondary { background: var(--tertiary-bg); color: var(--text-primary); border-color: var(--border-soft); }
.btn-secondary:hover:not(:disabled) { background: var(--card-hover); }
.btn-secondary:disabled { opacity: 0.4; cursor: not-allowed; }

.history-timeline { display: flex; flex-direction: column; gap: 0.8rem; }
.timeline-item { display: flex; gap: 1.25rem; align-items: flex-start; padding: 0.5rem 0; }
.timeline-year { font-size: 0.75rem; font-weight: 700; color: var(--accent-purple); background: rgba(191,90,242,0.12); padding: 0.3rem 0.65rem; border-radius: 6px; white-space: nowrap; flex-shrink: 0; }
.timeline-content { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.55; }

.resource-list { list-style: none; }
.resource-item { background: var(--card-bg); border: 1px solid var(--border-soft); border-radius: 10px; padding: 0.9rem 1.1rem; margin-bottom: 0.6rem; transition: all 0.2s; display: flex; align-items: center; gap: 0.8rem; }
.resource-item:hover { background: var(--card-hover); border-color: var(--accent-blue); }
.resource-link { color: var(--text-primary); text-decoration: none; display: flex; align-items: center; gap: 0.85rem; flex: 1; min-width: 0; }
.resource-type {
    font-size: 0.68rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.08em; padding: 0.22rem 0.55rem; border-radius: 6px;
    background: rgba(0, 113, 227, 0.15); color: var(--accent-blue);
    white-space: nowrap; flex-shrink: 0;
}
.resource-name { flex: 1; font-size: 0.92rem; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.resource-arrow { color: var(--text-secondary); }
.bookmark-btn {
    background: transparent; border: none; cursor: pointer;
    font-size: 1.1rem; padding: 0.25rem;
    color: var(--text-muted); transition: color 0.2s, transform 0.2s;
    flex-shrink: 0;
}
.bookmark-btn:hover { transform: scale(1.15); }
.bookmark-btn.active { color: var(--accent-amber); }

/* -------- Glossary -------- */
.glossary-search {
    width: 100%; padding: 0.7rem 1rem; background: var(--tertiary-bg);
    border: 1px solid var(--border-soft); border-radius: 10px;
    color: var(--text-primary); font-size: 0.95rem; margin-bottom: 1.25rem;
}
.glossary-search:focus { outline: none; border-color: var(--accent-blue); }
.glossary-list { display: flex; flex-direction: column; gap: 0.7rem; }
.glossary-entry {
    padding: 1rem 1.15rem; background: var(--card-bg);
    border: 1px solid var(--border-soft); border-radius: 10px;
}
.glossary-term { font-weight: 600; color: var(--text-primary); margin-bottom: 0.3rem; font-size: 0.98rem; }
.glossary-term abbr { color: var(--accent-blue); font-weight: 700; margin-right: 0.35rem; text-decoration: none; }
.glossary-def { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; }

/* -------- Fun facts -------- */
.fun-facts { position: fixed; right: 0; top: 50%; transform: translateY(-50%); z-index: 999; }
.fun-facts-toggle { background: var(--accent-purple); border: none; color: white; padding: 1.25rem 1rem; border-radius: 12px 0 0 12px; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 0.5rem; box-shadow: -4px 0 20px rgba(191,90,242,0.25); }
.toggle-text { font-size: 0.68rem; font-weight: 600; writing-mode: vertical-rl; text-orientation: mixed; letter-spacing: 0.05em; }
.fun-facts-content { position: absolute; right: 100%; top: 50%; transform: translateY(-50%); width: 320px; max-height: 70vh; overflow-y: auto; background: var(--glass-bg); backdrop-filter: blur(20px); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 1.25rem; margin-right: 0.5rem; box-shadow: var(--shadow-lg); }
.fun-facts-content h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 1rem; color: var(--accent-purple); }
.fun-fact-item { padding: 0.85rem 0; border-bottom: 1px solid var(--border-soft); }
.fun-fact-item:last-child { border-bottom: none; padding-bottom: 0; }
.fun-fact-item h4 { font-size: 0.82rem; font-weight: 600; margin-bottom: 0.35rem; color: var(--text-primary); }
.fun-fact-item p { color: var(--text-secondary); font-size: 0.8rem; line-height: 1.55; }

/* -------- Toast -------- */
.toast {
    position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%) translateY(120%);
    background: var(--secondary-bg); border: 1px solid var(--border-color);
    padding: 0.85rem 1.25rem; border-radius: 12px;
    box-shadow: var(--shadow-lg); z-index: 3000;
    transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    font-size: 0.9rem;
}
.toast.show { transform: translateX(-50%) translateY(0); }

.hidden { display: none !important; }

/* -------- Responsive -------- */
@media (max-width: 960px) {
    .nav-content { grid-template-columns: auto 1fr auto; }
    .nav-links { display: none; position: absolute; top: 100%; right: 1rem; background: var(--secondary-bg); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 1rem; flex-direction: column; gap: 0.75rem; min-width: 160px; box-shadow: var(--shadow-lg); }
    .nav-links.open { display: flex; }
    .nav-mobile { display: inline-block; }
    .nav-search { max-width: none; }
}

@media (max-width: 768px) {
    .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 1.75rem; }
    .path-cards, .topic-grid { grid-template-columns: 1fr; }
    .fun-facts { display: none; }
    .modal-content { padding: 1.75rem 1.25rem; }
    .modal-footer { flex-direction: column; }
    .modal-footer button { width: 100%; }
    .footer-inner { flex-direction: column; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
    .scroll-indicator { animation: none; }
}