/* ============================================
   Hexagonal Hermes - Apple Dark Theme CSS
   ============================================ */

/* CSS Variables */
:root {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-card: #111111;
    --bg-card-hover: #1a1a1a;
    --bg-card-expanded: #161616;
    --bg-glass: rgba(18, 18, 28, 0.72);
    --text-primary: #f5f5f7;
    --text-secondary: #86868b;
    --text-tertiary: #6e6e73;
    --accent-blue: #2997ff;
    --accent-purple: #a855f7;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 48%, #a855f7 100%);
    --accent-gradient-soft: linear-gradient(135deg, rgba(102,126,234,.18), rgba(168,85,247,.12));
    --border-color: rgba(255, 255, 255, 0.1);
    --card-radius: 16px;
    --nav-height: 60px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background:
        radial-gradient(circle at 20% -10%, rgba(102, 126, 234, 0.14), transparent 32rem),
        radial-gradient(circle at 90% 8%, rgba(168, 85, 247, 0.12), transparent 30rem),
        var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(4, 4, 8, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-content {
    max-width: 1240px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-link {
    font-size: 14px;
    color: var(--text-secondary);
    transition: color .2s ease;
}

.nav-link:hover {
    color: var(--text-primary);
}

.lang-toggle {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px 20px;
    border-radius: 980px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.lang-toggle:hover {
    background: rgba(255, 255, 255, 0.12);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 65vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: calc(var(--nav-height) + 80px) 40px 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-gradient {
    position: absolute;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 120%;
    height: 80%;
    background: radial-gradient(ellipse at center top, rgba(102, 126, 234, 0.15) 0%, rgba(118, 75, 162, 0.08) 40%, transparent 70%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 980px;
}

.hero-kicker {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text-tertiary);
    font-size: 13px;
    margin-bottom: 0;
}

.hero-live-dot {
    width: 7px;
    height: 7px;
    border-radius: 999px;
    background: #4ade80;
    box-shadow: 0 0 0 6px rgba(74, 222, 128, .11), 0 0 24px rgba(74, 222, 128, .55);
}

.hero-badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(102, 126, 234, 0.15);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 980px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: #a5b4fc;
    margin-bottom: 24px;
}

.hero-title {
    font-size: clamp(48px, 8vw, 92px);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 16px;
    background: linear-gradient(180deg, #fff 0%, rgba(255, 255, 255, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(20px, 2.5vw, 24px);
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 400;
}

.hero-desc {
    font-size: 16px;
    color: var(--text-tertiary);
    margin: 0 auto 30px;
    max-width: 760px;
}

.hero-actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 46px;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 22px;
    border-radius: 980px;
    font-size: 14px;
    font-weight: 600;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.hero-btn.primary {
    color: #fff;
    background: linear-gradient(135deg, var(--category-color, #667eea), #a855f7);
    box-shadow: 0 18px 50px rgba(102, 126, 234, .22);
}

.hero-btn.secondary {
    color: var(--text-primary);
    background: rgba(255,255,255,.06);
}

.hero-btn:hover {
    transform: translateY(-2px);
    border-color: rgba(255,255,255,.22);
}

.hero-visual {
    position: relative;
    width: min(560px, 88vw);
    height: 170px;
    margin: 0 auto 26px;
    opacity: .92;
}

.hex-core,
.hex-orbit {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    clip-path: polygon(25% 6%, 75% 6%, 100% 50%, 75% 94%, 25% 94%, 0 50%);
}

.hex-core {
    width: 86px;
    height: 98px;
    background: var(--accent-gradient);
    box-shadow: 0 0 70px rgba(118,75,162,.55);
}

.hex-orbit {
    width: 420px;
    height: 118px;
    border: 1px solid rgba(255,255,255,.16);
    background: linear-gradient(90deg, transparent, rgba(102,126,234,.12), transparent);
}

.orbit-two {
    width: 520px;
    height: 148px;
    transform: translate(-50%, -50%) rotate(180deg);
    opacity: .5;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 12px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* ============================================
   Categories Navigation
   ============================================ */
.categories-nav {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 12px;
    padding: 0;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

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

.category-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px 12px;
    background: linear-gradient(180deg, rgba(255,255,255,.055), rgba(255,255,255,.025));
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    min-width: 0;
    position: relative;
}

.category-btn:hover,
.category-btn.active {
    background: linear-gradient(180deg, rgba(102,126,234,.18), rgba(168,85,247,.08));
    border-color: rgba(167, 139, 250, 0.48);
    transform: translateY(-2px);
    box-shadow: 0 16px 42px rgba(0,0,0,.28);
}

.category-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-gradient);
    border-radius: 10px;
    opacity: 0.9;
}

.category-icon svg {
    width: 20px;
    height: 20px;
    stroke: white;
}

.category-name {
    font-size: 12px;
    font-weight: 500;
    text-align: center;
    line-height: 1.3;
    color: var(--text-secondary);
}

.category-count {
    position: absolute;
    top: 10px;
    right: 10px;
    min-width: 22px;
    height: 22px;
    padding: 0 7px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    color: var(--text-primary);
    background: rgba(255,255,255,.08);
    border: 1px solid rgba(255,255,255,.08);
}

.category-btn:hover .category-name {
    color: var(--text-primary);
}

/* ============================================
   Cases Container & Sections
   ============================================ */
.cases-container {
    display: flex;
    flex-direction: column;
    gap: 80px;
}

.category-section {
    scroll-margin-top: calc(var(--nav-height) + 20px);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.category-badge {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    border: 1px solid;
}

.category-badge-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.category-badge-icon svg {
    width: 28px;
    height: 28px;
}

.category-title-group {
    flex: 1;
}

.category-title {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}

.category-desc {
    font-size: 14px;
    color: var(--text-secondary);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

/* ============================================
   Case Card
   ============================================ */
.case-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    overflow: hidden;
    transition: var(--transition);
}

.case-card:hover {
    border-color: rgba(255, 255, 255, 0.15);
}

.case-card.expanded {
    background: var(--bg-card-expanded);
}

.case-card-header {
    padding: 24px;
    cursor: pointer;
    user-select: none;
}

.case-card-title-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.case-card-title {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.case-confidence {
    flex-shrink: 0;
    padding: 4px 10px;
    border-radius: 980px;
    font-size: 11px;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-secondary);
}

.case-confidence.high {
    background: rgba(34, 197, 94, 0.12);
    color: #4ade80;
}

.case-confidence.medium-high {
    background: rgba(251, 191, 36, 0.12);
    color: #fbbf24;
}

.case-card-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 16px;
}

.case-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.case-card-category {
    font-size: 12px;
    color: var(--text-tertiary);
    background: rgba(255, 255, 255, 0.04);
    padding: 4px 10px;
    border-radius: 6px;
}

.case-card-expand {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    color: var(--accent-blue);
    font-weight: 500;
}

.case-card-expand svg {
    width: 16px;
    height: 16px;
    transition: transform 0.3s ease;
}

.case-card-expand.expanded svg {
    transform: rotate(180deg);
}

/* ============================================
   Case Card Detail (Expanded Content)
   ============================================ */
.case-card-detail {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, background 0.3s ease;
}

.case-card-detail.open {
    max-height: 2000px;
    border-top: 1px solid var(--border-color);
}

.case-detail-content {
    padding: 0;
}

.detail-body {
    padding: 28px;
}

.detail-class-type {
    display: inline-block;
    font-size: 12px;
    color: var(--text-tertiary);
    background: rgba(255, 255, 255, 0.04);
    padding: 6px 12px;
    border-radius: 8px;
    margin-bottom: 20px;
}

/* ============================================
   Markdown Rendering
   ============================================ */
.detail-markdown {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.detail-markdown h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 24px 0 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.detail-markdown h2:first-child {
    margin-top: 0;
}

.detail-markdown h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 20px 0 12px;
}

.detail-markdown h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 16px 0 8px;
}

.detail-markdown p {
    margin-bottom: 14px;
}

.detail-markdown ul, .detail-markdown ol {
    margin: 12px 0;
    padding-left: 20px;
}

.detail-markdown li {
    margin-bottom: 6px;
}

.detail-markdown strong {
    color: var(--text-primary);
    font-weight: 600;
}

.detail-markdown a {
    color: var(--accent-blue);
    text-decoration: none;
}

.detail-markdown a:hover {
    text-decoration: underline;
}

.detail-markdown code {
    background: rgba(255, 255, 255, 0.08);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 13px;
    color: #a5b4fc;
}

.detail-markdown pre {
    background: #0a0a0a;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 16px;
    margin: 16px 0;
    overflow-x: auto;
}

.detail-markdown pre code {
    background: none;
    padding: 0;
    font-size: 13px;
    line-height: 1.6;
    color: #e5e5e5;
}

.detail-markdown table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 13px;
}

.detail-markdown td, .detail-markdown th {
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    text-align: left;
}

.detail-markdown tr:first-child td {
    background: rgba(255, 255, 255, 0.04);
    font-weight: 600;
    color: var(--text-primary);
}

.detail-markdown hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 24px 0;
}

/* ============================================
   Detail Actions
   ============================================ */
.detail-actions {
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.detail-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 980px;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.detail-btn svg {
    width: 18px;
    height: 18px;
}

.detail-btn.primary {
    background: var(--accent-gradient);
    color: white;
}

.detail-btn.primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* ============================================
   Detail Page (Full Page View)
   ============================================ */
.detail-page {
    min-height: 100vh;
    padding-top: var(--nav-height);
}

.detail-page-header {
    position: sticky;
    top: var(--nav-height);
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(20px);
    padding: 16px 40px;
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-blue);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: var(--transition);
}

.back-btn:hover {
    background: rgba(41, 151, 255, 0.1);
}

.back-btn svg {
    width: 18px;
    height: 18px;
}

.detail-page-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 60px 40px 100px;
}

.detail-page-title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.detail-page-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 40px;
}

.detail-confidence {
    padding: 6px 14px;
    border-radius: 980px;
    font-size: 12px;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-secondary);
}

.detail-confidence.high {
    background: rgba(34, 197, 94, 0.12);
    color: #4ade80;
}

.detail-class {
    font-size: 14px;
    color: var(--text-tertiary);
}

.detail-page-body {
    margin-bottom: 40px;
}

.detail-page-footer {
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.detail-page .detail-markdown {
    font-size: 16px;
}

.detail-page .detail-markdown h2 {
    font-size: 24px;
}

.detail-page .detail-markdown h3 {
    font-size: 18px;
}

.detail-page .detail-markdown pre {
    padding: 20px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 60px 40px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-content p {
    font-size: 14px;
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
}

.footer-links a {
    color: var(--accent-blue);
    transition: opacity 0.2s;
}

.footer-links a:hover {
    opacity: 0.8;
}

.footer-links span {
    color: var(--text-tertiary);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1200px) {
    .categories-nav {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 900px) {
    .categories-nav {
        grid-template-columns: repeat(3, 1fr);
    }

    .search-panel {
        grid-template-columns: 1fr;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --nav-height: 52px;
    }

    .nav-content {
        padding: 0 20px;
    }

    .nav-link {
        display: none;
    }

    .hero {
        padding: calc(var(--nav-height) + 60px) 20px 60px;
        min-height: 60vh;
    }

    .hero-stats {
        gap: 40px;
    }

    .stat-number {
        font-size: 40px;
    }

    .main-content {
        padding: 40px 20px 80px;
    }

    .categories-nav {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .category-btn {
        padding: 16px 10px;
        min-width: auto;
    }

    .category-icon {
        width: 32px;
        height: 32px;
    }

    .category-icon svg {
        width: 18px;
        height: 18px;
    }

    .category-name {
        font-size: 11px;
    }

    .category-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .category-title {
        font-size: 24px;
    }

    .cases-container {
        gap: 60px;
    }

    .case-card-header {
        padding: 20px;
    }

    .detail-body {
        padding: 20px;
    }

    .detail-page-content {
        padding: 40px 20px 80px;
    }

    .footer {
        padding: 40px 20px;
    }
}

@media (max-width: 480px) {
    .categories-nav {
        grid-template-columns: 1fr 1fr;
    }

    .usecase-panel {
        padding: 20px;
        border-radius: 22px;
    }

    .hero-visual {
        height: 118px;
    }

    .hex-orbit {
        width: 300px;
        height: 88px;
    }

    .orbit-two {
        width: 360px;
        height: 108px;
    }

    .hero-stats {
        gap: 30px;
    }

    .stat-number {
        font-size: 36px;
    }
}


/* ============================================
   2026 Optimization Layer - Enhanced
   ============================================ */

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    border: 3px solid var(--bg-primary);
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Grain Overlay */
body::after {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.04;
    z-index: 9999;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

.main-content {
    max-width: 1240px;
    margin: 0 auto;
    padding: 64px 40px 110px;
}

.course-spotlight {
    margin-bottom: 64px;
    padding: 36px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 420px;
    gap: 36px;
    align-items: center;
    border: 1px solid rgba(255, 255, 255, 0.09);
    border-radius: 32px;
    background:
        radial-gradient(circle at 88% 18%, rgba(168, 85, 247, .20), transparent 18rem),
        linear-gradient(135deg, rgba(255,255,255,.08), rgba(255,255,255,.025));
    box-shadow: inset 0 1px 0 rgba(255,255,255,.07), 0 40px 110px rgba(0,0,0,.34);
    overflow: hidden;
}

.course-spotlight-copy h2 {
    font-size: clamp(30px, 4vw, 48px);
    line-height: 1.1;
    letter-spacing: -.035em;
    margin-bottom: 16px;
}

.course-spotlight-copy p {
    color: var(--text-secondary);
    font-size: 17px;
    line-height: 1.75;
    max-width: 720px;
}

.course-spotlight-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 26px;
}

.course-spotlight-visual svg {
    width: 100%;
    height: auto;
    display: block;
    filter: drop-shadow(0 24px 60px rgba(0,0,0,.35));
}

.usecase-panel {
    scroll-margin-top: calc(var(--nav-height) + 24px);
    margin-bottom: 64px;
    padding: 32px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 28px;
    background: linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.025));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.06), 0 40px 100px rgba(0,0,0,.32);
}

.section-intro {
    max-width: 760px;
    margin-bottom: 32px;
}

.section-eyebrow {
    display: inline-block;
    margin-bottom: 12px;
    color: #a5b4fc;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .12em;
    text-transform: uppercase;
}

.section-intro h2 {
    font-size: clamp(28px, 4vw, 44px);
    letter-spacing: -.03em;
    line-height: 1.12;
    margin-bottom: 16px;
}

.section-intro p {
    color: var(--text-secondary);
    font-size: 17px;
    line-height: 1.6;
}

.search-panel {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 16px;
    margin: 32px 0 24px;
}

.search-box {
    min-height: 58px;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 0 20px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0,0,0,.32);
    color: var(--text-tertiary);
    transition: var(--transition);
}

.search-box:focus-within {
    border-color: rgba(165, 180, 252, 0.4);
    box-shadow: 0 0 0 4px rgba(165, 180, 252, 0.1);
}

.search-box svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.search-box input {
    width: 100%;
    border: 0;
    outline: 0;
    background: transparent;
    color: var(--text-primary);
    font: inherit;
    font-size: 16px;
}

.search-box input::placeholder {
    color: var(--text-tertiary);
}

.clear-filter {
    min-height: 58px;
    padding: 0 24px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    background: rgba(255,255,255,.06);
    font-weight: 600;
    transition: var(--transition);
}

.clear-filter:hover {
    background: rgba(255,255,255,.12);
    transform: translateY(-1px);
}

.category-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.category-title span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    padding: 0 10px;
    border-radius: 999px;
    font-size: 13px;
    color: #c4b5fd;
    background: rgba(167,139,250,.12);
    border: 1px solid rgba(167,139,250,.2);
}

.case-card {
    position: relative;
    background: linear-gradient(180deg, rgba(255,255,255,.055), rgba(255,255,255,.025));
    box-shadow: inset 0 1px 0 rgba(255,255,255,.045);
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: var(--transition);
}

.case-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.035));
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.case-card::before {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    border-radius: inherit;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 0%), rgba(102,126,234,.12), transparent 45%);
    opacity: 0;
    transition: opacity .4s ease;
}

.case-card:hover::before,
.case-card.expanded::before {
    opacity: 1;
}

/* Code Block Enhancements */
.detail-markdown pre {
    position: relative;
    padding: 20px;
    background: #050505;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.05);
}

.copy-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 6px 12px;
    font-size: 12px;
    color: var(--text-secondary);
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 6px;
    opacity: 0;
    transition: var(--transition);
}

.detail-markdown pre:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background: rgba(255,255,255,0.1);
    color: var(--text-primary);
}

.copy-btn.copied {
    color: #4ade80;
    border-color: #4ade80;
}

.case-card-header.expanded .case-card-title {
    color: #fff;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.empty-state {
    text-align: center;
    padding: 100px 24px;
    border: 1px dashed rgba(255,255,255,0.15);
    border-radius: 32px;
    background: rgba(255,255,255,.02);
}

.empty-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 24px;
    border-radius: 24px;
    display: grid;
    place-items: center;
    color: #a5b4fc;
    background: var(--accent-gradient-soft);
    font-size: 32px;
}

@media (max-width: 900px) {
    .main-content {
        padding: 48px 24px 90px;
    }

    .course-spotlight {
        grid-template-columns: 1fr;
    }

    .course-spotlight-visual {
        order: -1;
        max-width: 520px;
        margin: 0 auto;
    }

    .search-panel {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        height: 140px;
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: 40px 20px 80px;
    }

    .usecase-panel,
    .course-spotlight {
        padding: 24px;
        border-radius: 24px;
    }

    .hero-actions {
        margin-bottom: 34px;
    }

    .hero-btn {
        width: 100%;
        max-width: 320px;
    }
}

@media (max-width: 480px) {
    .section-intro p,
    .hero-desc {
        font-size: 15px;
    }

    .search-box,
    .clear-filter {
        min-height: 52px;
        border-radius: 16px;
    }
}