/* Learning Hub styles */
:root {
    --bg-primary: #0f172a;
    --bg-secondary: #121c31;
    --bg-card: #132036;
    --bg-panel: rgba(19, 32, 54, 0.8);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --primary: #38bdf8;
    --accent: #8b5cf6;
    --border: rgba(56, 189, 248, 0.25);
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
    --glass: rgba(255, 255, 255, 0.04);
}

body[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-panel: rgba(255, 255, 255, 0.82);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --primary: #0284c7;
    --accent: #7c3aed;
    --border: rgba(2, 132, 199, 0.25);
    --shadow: 0 16px 40px rgba(15, 23, 42, 0.12);
    --glass: rgba(15, 23, 42, 0.04);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 24px;
    overflow-x: hidden;
}

.circle-container {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
}

.circle {
    position: absolute;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.5), rgba(139, 92, 246, 0.1));
    opacity: 0.1;
}

.navbar {
    position: sticky;
    top: 18px;
    z-index: 10;
    background: linear-gradient(135deg, var(--bg-panel), var(--glass));
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 14px 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow);
    gap: 16px;
}

.nav-logo {
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 0.2px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 18px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    padding-bottom: 4px;
    border-bottom: 2px solid transparent;
    transition: color 0.25s ease, border-color 0.25s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    border-color: var(--primary);
}

.theme-toggle {
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    border-radius: 10px;
    padding: 8px 12px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.theme-toggle:hover {
    transform: translateY(-1px);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    border: none;
    background: transparent;
    cursor: pointer;
}

.hamburger span {
    display: block;
    width: 26px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 8px;
}

.resources-wrapper {
    max-width: 1250px;
    margin: 0 auto;
    padding: 12px 4px 60px;
}

.hero {
    background: linear-gradient(120deg, rgba(56, 189, 248, 0.12), rgba(139, 92, 246, 0.08));
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 32px;
    margin-top: 18px;
    box-shadow: var(--shadow);
}

.pill-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.9rem;
}

.pill-primary { background: var(--primary); color: #0b1222; }
.pill-ghost { background: var(--glass); color: var(--text-primary); border: 1px solid var(--border); }
.pill-outline { border: 1px dashed var(--border); color: var(--text-primary); }

.hero h1 {
    margin: 6px 0 10px;
    font-size: clamp(1.8rem, 3vw, 2.6rem);
}

.hero-subtitle {
    color: var(--text-secondary);
    max-width: 880px;
    margin: 0 0 16px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 14px;
    margin-top: 18px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 16px;
    box-shadow: var(--shadow);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 6px 0 0;
    color: var(--primary);
}

.section-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.eyebrow {
    margin: 0 0 6px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.section-subtitle {
    color: var(--text-secondary);
    margin: 6px 0 0;
    max-width: 620px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ghost-link {
    color: var(--text-primary);
    text-decoration: none;
    border: 1px solid var(--border);
    padding: 10px 14px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.25s ease;
}

.ghost-link:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.starter-section {
    margin-top: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.starter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
}

.starter-card {
    background: linear-gradient(145deg, var(--bg-secondary), var(--bg-card));
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 16px;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 12px;
    align-items: start;
}

.starter-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--glass);
    display: grid;
    place-items: center;
    font-size: 1.3rem;
}

.starter-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.starter-card h3 { margin: 4px 0 8px; }

.starter-card ul {
    padding-left: 18px;
    margin: 0;
    color: var(--text-secondary);
    display: grid;
    gap: 6px;
}

.controls {
    margin-top: 28px;
    display: grid;
    gap: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 16px;
    box-shadow: var(--shadow);
}

.search-box {
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 10px 12px;
    background: var(--glass);
}

.search-box i { color: var(--text-secondary); }

.search-box input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
}

.ghost-btn {
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-primary);
    border-radius: 10px;
    padding: 8px 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.ghost-btn:hover { border-color: var(--primary); color: var(--primary); }

.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    justify-content: space-between;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.filter-btn {
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: 999px;
    padding: 8px 14px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #0b1222;
    border-color: transparent;
}

.filter-btn:hover { border-color: var(--primary); }

.quick-actions { display: flex; align-items: center; gap: 10px; color: var(--text-secondary); }

.library-section {
    margin-top: 28px;
}

.library-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 18px;
    align-items: start;
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 14px;
}

.resource-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 16px;
    box-shadow: var(--shadow);
    display: grid;
    gap: 10px;
    position: relative;
    overflow: hidden;
}

.resource-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(145deg, rgba(56, 189, 248, 0.12), rgba(139, 92, 246, 0.08));
    opacity: 0;
    transition: opacity 0.25s ease;
}

.resource-card:hover::before { opacity: 1; }

.resource-card h3 { margin: 0; position: relative; z-index: 1; }

.topics {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    position: relative;
    z-index: 1;
}

.resource-meta {
    display: flex;
    gap: 8px;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.92rem;
    position: relative;
    z-index: 1;
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--glass);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 0.85rem;
    position: relative;
    z-index: 1;
}

.topic-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    background: rgba(56, 189, 248, 0.15);
    color: var(--text-primary);
    border-radius: 10px;
    font-weight: 600;
    border: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

.resource-card p {
    color: var(--text-secondary);
    margin: 0;
    position: relative;
    z-index: 1;
}

.card-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #0b1222;
    border: none;
    padding: 10px 14px;
    border-radius: 10px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.bookmark-btn {
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 10px 12px;
    border-radius: 10px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.bookmark-btn.saved {
    background: rgba(56, 189, 248, 0.16);
    border-color: var(--primary);
    color: var(--primary);
}

.bookmark-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 16px;
    box-shadow: var(--shadow);
    position: sticky;
    top: 96px;
    height: fit-content;
}

.bookmark-header { display: grid; gap: 6px; }

.bookmark-list {
    margin-top: 12px;
    display: grid;
    gap: 10px;
}

.bookmark-item {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
    background: var(--glass);
    display: grid;
    gap: 6px;
}

.bookmark-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.inline-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 700;
}

.inline-link:hover { text-decoration: underline; }

.badge { background: var(--glass); border: 1px solid var(--border); color: var(--text-primary); padding: 6px 10px; border-radius: 12px; font-weight: 700; }

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 14px;
}

.video-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.video-frame { position: relative; padding-top: 56.25%; }

.video-frame iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.video-info { padding: 14px; display: grid; gap: 8px; }

.cheatsheet-section {
    margin-top: 28px;
}

.cheatsheet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 12px;
}

.cheatsheet-card {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 12px;
    align-items: center;
    padding: 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    color: var(--text-primary);
    text-decoration: none;
    box-shadow: var(--shadow);
}

.cheatsheet-card:hover { border-color: var(--primary); }

.icon-circle {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--glass);
    display: grid;
    place-items: center;
    font-size: 1.1rem;
}

.cta-section { margin-top: 34px; }

.cta-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 18px;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(139, 92, 246, 0.1));
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.cta-actions { display: flex; gap: 10px; flex-wrap: wrap; }

.footer {
    margin-top: 38px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.footer-about p { color: var(--text-secondary); }

.footer-links ul {
    list-style: none;
    padding: 0;
    margin: 8px 0 0;
    display: grid;
    gap: 6px;
}

.footer-links a { color: var(--text-primary); text-decoration: none; }

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

.footer-social-icons { display: flex; gap: 10px; }

.footer-social-icons a { color: var(--text-primary); font-size: 1.2rem; }

.footer-bottom {
    margin-top: 14px;
    border-top: 1px solid var(--border);
    padding-top: 10px;
    color: var(--text-secondary);
    text-align: center;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

@media (max-width: 980px) {
    .navbar { flex-wrap: wrap; }
    .nav-links { display: none; width: 100%; flex-wrap: wrap; }
    .nav-links.active { display: flex; }
    .hamburger { display: flex; }
    .library-layout { grid-template-columns: 1fr; }
    .bookmark-panel { position: static; }
    .hero, .starter-section, .controls { padding: 18px; }
}

@media (max-width: 640px) {
    body { padding: 14px; }
    .filter-buttons { width: 100%; }
    .quick-actions { width: 100%; justify-content: space-between; }
    .section-header { flex-direction: column; }
    .cta-card { flex-direction: column; align-items: flex-start; }
}