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

:root {
    --bg: #0f0f17;
    --bg2: #16161f;
    --bg3: #1e1e2a;
    --card: #1a1a28;
    --border: #2a2a3a;
    --text: #e0e0ec;
    --text2: #9090a8;
    --purple: #7b5aff;
    --green: #3cc8a0;
    --blue: #50b4ff;
    --orange: #ffa03c;
    --red: #ff5050;
    --purple-bg: rgba(123,90,255,.1);
    --green-bg: rgba(60,200,160,.1);
    --blue-bg: rgba(80,180,255,.1);
    --orange-bg: rgba(255,160,60,.1);
    --red-bg: rgba(255,80,80,.1);
}

html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
a { color: var(--purple); text-decoration: none; transition: .2s; }
a:hover { color: var(--blue); }
code { font-family: 'JetBrains Mono', monospace; background: var(--bg3); padding: 2px 6px; border-radius: 4px; font-size: .85em; }

/* ── Navigation ── */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 32px;
    background: rgba(15,15,23,.85); backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: .3s;
}
.nav.scrolled { padding: 10px 32px; box-shadow: 0 4px 30px rgba(0,0,0,.4); }
.nav-logo { font-weight: 800; font-size: 1.2rem; color: var(--purple); }
.nav-links { display: flex; gap: 28px; }
.nav-links a { color: var(--text2); font-size: .95rem; font-weight: 500; transition: .2s; }
.nav-links a:hover { color: var(--text); }
.nav-burger { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.nav-burger span { display: block; width: 24px; height: 2px; background: var(--text); transition: .3s; }

@media (max-width: 768px) {
    .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; background: var(--bg2); padding: 20px; gap: 16px; border-bottom: 1px solid var(--border); }
    .nav-links.open { display: flex; }
    .nav-burger { display: flex; }
}

/* ── Hero ── */
.hero {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    padding: 120px 32px 80px; gap: 60px; position: relative; overflow: hidden;
    flex-wrap: wrap;
}
.hero-glow {
    position: absolute; top: -200px; left: 50%; transform: translateX(-50%);
    width: 800px; height: 600px;
    background: radial-gradient(ellipse, rgba(123,90,255,.15), transparent 70%);
    pointer-events: none;
}
.hero-content { max-width: 550px; z-index: 1; }
.hero-badge {
    display: inline-block; padding: 6px 16px; border-radius: 20px;
    background: var(--purple-bg); border: 1px solid rgba(123,90,255,.3);
    color: var(--purple); font-size: .9rem; font-weight: 600; margin-bottom: 24px;
}
.hero h1 { font-size: 4rem; font-weight: 900; line-height: 1.1; margin-bottom: 16px; letter-spacing: -1px; }
.hero-subtitle { font-size: 1.3rem; color: var(--text2); margin-bottom: 24px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 40px; }
.tag { padding: 6px 14px; border-radius: 8px; font-size: .8rem; font-weight: 600; }
.tag-purple { background: var(--purple-bg); color: var(--purple); border: 1px solid rgba(123,90,255,.3); }
.tag-green { background: var(--green-bg); color: var(--green); border: 1px solid rgba(60,200,160,.3); }
.tag-blue { background: var(--blue-bg); color: var(--blue); border: 1px solid rgba(80,180,255,.3); }
.tag-orange { background: var(--orange-bg); color: var(--orange); border: 1px solid rgba(255,160,60,.3); }
.tag-red { background: var(--red-bg); color: var(--red); border: 1px solid rgba(255,80,80,.3); }
.hero-cta {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 14px 28px; border-radius: 12px;
    background: var(--purple); color: #fff; font-weight: 600; font-size: 1rem;
    transition: .3s; border: none; cursor: pointer;
}
.hero-cta:hover { background: #6a48e8; color: #fff; transform: translateY(-2px); box-shadow: 0 8px 30px rgba(123,90,255,.3); }
.hero-visual { z-index: 1; }

/* ── Code Window ── */
.code-window {
    background: #1a1a2e; border-radius: 12px; border: 1px solid var(--border);
    overflow: hidden; min-width: 380px; box-shadow: 0 20px 60px rgba(0,0,0,.4);
}
.code-window.large { min-width: auto; max-width: 700px; margin: 30px auto 0; }
.code-header {
    display: flex; align-items: center; gap: 8px; padding: 12px 16px;
    background: #141420; border-bottom: 1px solid var(--border);
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }
.code-title { margin-left: auto; color: var(--text2); font-size: .8rem; font-family: 'JetBrains Mono', monospace; }
.code-body { padding: 20px; font-family: 'JetBrains Mono', monospace; font-size: .9rem; line-height: 1.8; overflow-x: auto; }
.c-comment { color: #6272a4; }
.c-heading { color: var(--purple); font-weight: 600; }
.c-keyword { color: var(--blue); }
.c-string { color: var(--green); }
.c-text { color: var(--text); }
.c-warn { color: var(--orange); }

@media (max-width: 768px) {
    .hero { padding: 100px 20px 60px; }
    .hero h1 { font-size: 2.5rem; }
    .code-window { min-width: auto; }
    .hero-visual { width: 100%; }
}

/* ── Stats ── */
.stats { padding: 60px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; }
.stat-card { text-align: center; padding: 30px; }
.stat-number { font-size: 3rem; font-weight: 900; color: var(--purple); }
.stat-label { color: var(--text2); font-size: .95rem; margin-top: 8px; }

/* ── Sections ── */
.section { padding: 100px 0; }
.section-dark { background: var(--bg2); }
.section-header { margin-bottom: 60px; }
.section-number { font-size: 5rem; font-weight: 900; color: rgba(123,90,255,.1); line-height: 1; display: block; }
.section-header h2 { font-size: 2.5rem; font-weight: 800; margin-top: -20px; }
.section-desc { color: var(--text2); font-size: 1.15rem; margin-top: 12px; max-width: 600px; }
.subsection { margin-top: 80px; }
.subsection-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 12px; }
.subsection-desc { color: var(--text2); margin-bottom: 30px; }

/* ── Audience Toggle ── */
.audience-toggle {
    display: flex; gap: 4px; margin-bottom: 40px;
    background: var(--bg3); border-radius: 12px; padding: 4px; width: fit-content;
}
.toggle-btn {
    padding: 12px 24px; border-radius: 10px; border: none; cursor: pointer;
    font-size: .95rem; font-weight: 600; font-family: 'Inter', sans-serif;
    background: transparent; color: var(--text2); transition: .3s;
}
.toggle-btn.active { background: var(--purple); color: #fff; box-shadow: 0 4px 15px rgba(123,90,255,.3); }
.toggle-btn:not(.active):hover { color: var(--text); }
.audience-content { animation: fadeUp .4s ease; }
.audience-content.hidden { display: none; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(15px); } to { opacity: 1; transform: translateY(0); } }

.usecase-label.biz { background: var(--green-bg); color: var(--green); }

/* ── What is Claude Code ── */
.what-hero { margin-bottom: 48px; }
.what-lead { font-size: 1.2rem; line-height: 1.7; color: var(--text); max-width: 800px; }
.what-sub { font-size: 1.05rem; color: var(--purple); font-weight: 600; margin-top: 16px; }

.what-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.what-card {
    background: var(--card); border: 1px solid var(--border); border-radius: 16px;
    padding: 28px; transition: .3s;
}
.what-card:hover { border-color: var(--purple); transform: translateY(-4px); }
.what-icon { font-size: 2rem; margin-bottom: 12px; }
.what-card h4 { margin-bottom: 8px; font-size: 1.1rem; }
.what-card p { color: var(--text2); font-size: .95rem; line-height: 1.5; }

.what-usecases { margin-top: 60px; }
.usecases-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; margin-top: 24px; }
.usecase { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.usecase-label {
    display: inline-block; padding: 4px 12px; border-radius: 6px;
    background: var(--purple-bg); color: var(--purple); font-size: .75rem;
    font-weight: 700; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 10px;
}
.usecase p { color: var(--text2); font-size: .88rem; line-height: 1.5; }

/* ── Cards ── */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.card {
    background: var(--card); border: 1px solid var(--border); border-radius: 16px;
    padding: 32px; transition: .3s;
}
.card:hover { transform: translateY(-4px); border-color: var(--purple); }
.card-accent { border-color: var(--green); background: rgba(60,200,160,.05); }
.card-icon { font-size: 2rem; margin-bottom: 16px; }
.card h3 { font-size: 1.2rem; margin-bottom: 12px; }
.card p { color: var(--text2); font-size: 1rem; line-height: 1.6; }

/* ── 10 Sections Grid ── */
.sections-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; margin-top: 24px; }
.section-item { display: flex; align-items: center; gap: 16px; padding: 16px; background: var(--card); border-radius: 12px; border: 1px solid var(--border); }
.num { width: 40px; height: 40px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-weight: 800; color: #fff; flex-shrink: 0; }
.num.purple { background: var(--purple); }
.num.green { background: var(--green); }
.num.blue { background: var(--blue); }
.num.orange { background: var(--orange); }
.num.red { background: var(--red); }
.section-item strong { display: block; margin-bottom: 2px; }
.section-item div { font-size: .95rem; color: var(--text2); }

/* ── Chart ── */
.chart { max-width: 700px; margin-top: 24px; }
.chart-bar { margin-bottom: 20px; }
.chart-bar label { display: block; color: var(--text2); font-size: .9rem; margin-top: 6px; }
.bar { height: 36px; border-radius: 8px; display: flex; align-items: center; padding: 0 16px; transition: width 1.5s ease; }
.bar span { font-weight: 700; font-size: .95rem; }
.bar-green { background: linear-gradient(90deg, var(--green), #2aa080); }
.bar-blue { background: linear-gradient(90deg, var(--blue), #3090d0); }
.bar-orange { background: linear-gradient(90deg, var(--orange), #e08020); }
.bar-red { background: linear-gradient(90deg, var(--red), #cc3030); }

/* ── Hierarchy ── */
.hierarchy { max-width: 700px; margin: 0 auto; }
.h-level {
    display: flex; align-items: stretch; gap: 20px;
    background: var(--card); border-radius: 16px; border: 1px solid var(--border);
    padding: 24px; position: relative; transition: .3s;
}
.h-level:hover { transform: translateX(8px); }
.h-level[data-color="purple"] { border-left: 4px solid var(--purple); }
.h-level[data-color="green"] { border-left: 4px solid var(--green); }
.h-level[data-color="orange"] { border-left: 4px solid var(--orange); }
.h-level[data-color="blue"] { border-left: 4px solid var(--blue); }
.h-level[data-color="red"] { border-left: 4px solid var(--red); }
.h-file { font-family: 'JetBrains Mono', monospace; font-weight: 600; font-size: 1rem; margin-bottom: 4px; }
.h-label { font-weight: 700; font-size: .9rem; margin-bottom: 4px; }
.h-level[data-color="purple"] .h-label { color: var(--purple); }
.h-level[data-color="green"] .h-label { color: var(--green); }
.h-level[data-color="orange"] .h-label { color: var(--orange); }
.h-level[data-color="blue"] .h-label { color: var(--blue); }
.h-level[data-color="red"] .h-label { color: var(--red); }
.h-desc { color: var(--text2); font-size: .95rem; }
.h-connector { width: 2px; height: 24px; background: var(--border); margin: 0 auto; position: relative; }
.h-connector::after { content: ''; position: absolute; bottom: -4px; left: -4px; width: 10px; height: 10px; border-left: 2px solid var(--text2); border-bottom: 2px solid var(--text2); transform: rotate(-45deg); }

/* ── Comparison ── */
.comparison { display: flex; align-items: stretch; gap: 24px; flex-wrap: wrap; justify-content: center; }
.comp-card { flex: 1; min-width: 280px; max-width: 420px; background: var(--card); border-radius: 16px; border: 1px solid var(--border); overflow: hidden; }
.comp-header { padding: 20px; text-align: center; font-weight: 800; font-size: 1.3rem; color: #fff; }
.comp-orange { background: linear-gradient(135deg, var(--orange), #e08020); }
.comp-green { background: linear-gradient(135deg, var(--green), #2aa080); }
.comp-body { padding: 24px; }
.comp-body ul { list-style: none; margin: 16px 0; }
.comp-body li { padding: 8px 0; color: var(--text); font-size: .95rem; border-bottom: 1px solid var(--border); }
.comp-tag { display: inline-block; padding: 4px 12px; border-radius: 6px; background: var(--orange-bg); color: var(--orange); font-size: .8rem; font-weight: 600; }
.comp-tag-good { background: var(--green-bg); color: var(--green); }
.comp-warn { color: var(--red); font-size: .9rem; margin-top: 12px; font-weight: 600; }
.comp-good { color: var(--green); font-size: .9rem; margin-top: 12px; font-weight: 600; }
.comp-vs { font-size: 2rem; font-weight: 900; color: var(--text2); align-self: center; }

/* ── Compare Table ── */
.table-wrap { overflow-x: auto; }
.compare-table { width: 100%; border-collapse: collapse; margin-top: 24px; }
.compare-table th, .compare-table td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--border); font-size: .95rem; }
.compare-table th { font-weight: 700; color: var(--text2); }
.th-orange { color: var(--orange) !important; }
.th-blue { color: var(--blue) !important; }
.th-green { color: var(--green) !important; }
.compare-table td:first-child { font-weight: 600; color: var(--text); }
.compare-table .warn { color: var(--orange); font-weight: 600; }
.compare-table .good { color: var(--green); font-weight: 600; }

/* ── Code Example ── */
.code-example { margin-top: 50px; }
.code-example h3 { font-size: 1.3rem; margin-bottom: 16px; }

/* ── MCP ── */
.mcp-hub { position: relative; width: 100%; max-width: 600px; height: 500px; margin: 0 auto 60px; }
.mcp-center {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 120px; height: 120px; border-radius: 24px;
    background: var(--purple); display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 1rem; text-align: center; color: #fff; z-index: 2;
    box-shadow: 0 0 60px rgba(123,90,255,.3);
}
.mcp-nodes { position: absolute; inset: 0; }
.mcp-node {
    position: absolute; top: 50%; left: 50%;
    --r: 200px;
    transform: translate(-50%, -50%) rotate(var(--angle)) translateY(calc(-1 * var(--r))) rotate(calc(-1 * var(--angle)));
}
.mcp-node span {
    display: block; padding: 10px 20px; border-radius: 12px; font-weight: 600; font-size: .9rem;
    background: var(--card); border: 1px solid var(--border); white-space: nowrap;
    transition: .3s;
}
.mcp-node:hover span { transform: scale(1.1); }
.mcp-node[data-color="green"] span { border-color: var(--green); color: var(--green); }
.mcp-node[data-color="blue"] span { border-color: var(--blue); color: var(--blue); }
.mcp-node[data-color="orange"] span { border-color: var(--orange); color: var(--orange); }
.mcp-node[data-color="red"] span { border-color: var(--red); color: var(--red); }
.mcp-node[data-color="purple"] span { border-color: var(--purple); color: var(--purple); }

.mcp-types { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 24px; margin-top: 40px; }
.mcp-type { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 24px; }
.mcp-type h4 { color: var(--blue); margin-bottom: 8px; }
.mcp-type p { color: var(--text2); font-size: .95rem; }

@media (max-width: 640px) {
    .mcp-hub { height: 400px; }
    .mcp-node { --r: 150px !important; }
    .mcp-node span { font-size: .75rem; padding: 8px 14px; }
}

/* ── Tips ── */
.tips-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px; }
.tip-card {
    background: var(--card); border: 1px solid var(--border); border-radius: 16px;
    padding: 28px; transition: .3s;
}
.tip-card:hover { border-color: var(--purple); }
.tip-key {
    display: inline-block; padding: 8px 18px; border-radius: 8px;
    background: var(--purple); color: #fff; font-family: 'JetBrains Mono', monospace;
    font-weight: 600; font-size: .9rem; margin-bottom: 14px;
}
.tip-card h4 { margin-bottom: 8px; font-size: 1.1rem; }
.tip-card p { color: var(--text2); font-size: .95rem; }

.advanced-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin-top: 24px; }
.adv-card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 28px; }
.adv-icon { font-size: 2rem; margin-bottom: 12px; }
.adv-card h4 { margin-bottom: 8px; }
.adv-card p { color: var(--text2); font-size: .95rem; }

/* ── Practice ── */
.levels { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.level { background: var(--card); border-radius: 16px; border: 1px solid var(--border); overflow: hidden; }
.level-header { padding: 24px; }
.level-badge { display: inline-block; padding: 4px 12px; border-radius: 6px; font-size: .75rem; font-weight: 700; text-transform: uppercase; margin-bottom: 8px; }
.level-1 .level-badge { background: var(--green-bg); color: var(--green); }
.level-2 .level-badge { background: var(--blue-bg); color: var(--blue); }
.level-3 .level-badge { background: var(--red-bg); color: var(--red); }
.level h3 { font-size: 1.3rem; }
.level-tasks { padding: 0 24px 24px; }
.task { display: flex; align-items: flex-start; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--border); cursor: pointer; font-size: .95rem; }
.task:last-child { border-bottom: none; }
.task input[type="checkbox"] { margin-top: 4px; accent-color: var(--purple); width: 18px; height: 18px; cursor: pointer; }
.task span { flex: 1; }

.checklist { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; margin-top: 24px; }
.check-item { display: flex; align-items: center; gap: 12px; padding: 14px 18px; background: var(--card); border-radius: 10px; border: 1px solid var(--border); cursor: pointer; font-size: .95rem; transition: .2s; }
.check-item:hover { border-color: var(--purple); }
.check-item input { accent-color: var(--green); width: 18px; height: 18px; cursor: pointer; }

/* ── Resources ── */
.resources-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 32px; }
.res-group h3 { color: var(--purple); margin-bottom: 16px; font-size: 1.1rem; }
.res-link { display: block; padding: 10px 0; border-bottom: 1px solid var(--border); color: var(--text); font-size: .95rem; transition: .2s; }
.res-link:hover { color: var(--purple); padding-left: 8px; }

/* ── Author ── */
.author {
    display: flex; align-items: center; gap: 48px;
    max-width: 800px; margin: 0 auto;
    flex-wrap: wrap; justify-content: center;
}
.author-photo {
    width: 200px; height: 200px; border-radius: 50%; overflow: hidden; flex-shrink: 0;
    border: 3px solid var(--purple);
    box-shadow: 0 0 40px rgba(123,90,255,.25);
}
.author-photo img { width: 100%; height: 100%; object-fit: cover; }
.author-info { flex: 1; min-width: 280px; }
.author-info h3 { font-size: 1.8rem; font-weight: 800; margin-bottom: 4px; }
.author-role { color: var(--purple); font-weight: 600; margin-bottom: 12px; }
.author-desc { color: var(--text2); font-size: .95rem; margin-bottom: 20px; line-height: 1.6; }
.author-links { display: flex; gap: 16px; flex-wrap: wrap; }
.author-link {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px; border-radius: 10px;
    font-weight: 600; font-size: .95rem; transition: .3s;
    border: 1px solid var(--border); color: var(--text);
}
.author-link:hover { transform: translateY(-2px); }
.author-link.tg { border-color: #2AABEE; }
.author-link.tg:hover { background: rgba(42,171,238,.1); color: #2AABEE; }
.author-link.gh { border-color: #8b949e; }
.author-link.gh:hover { background: rgba(139,148,158,.1); color: #fff; }

.about-details { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 24px; margin-top: 48px; }
.about-card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 32px; }
.about-card h4 { font-size: 1.2rem; margin-bottom: 16px; color: var(--purple); }
.about-card ul { list-style: none; }
.about-card li { padding: 8px 0; color: var(--text2); font-size: .95rem; border-bottom: 1px solid var(--border); }
.about-card li:last-child { border-bottom: none; }

.stack-grid { display: flex; flex-direction: column; gap: 16px; }
.stack-group { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.stack-label { font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--text2); min-width: 90px; }
.stack-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.about-card-wide { grid-column: 1 / -1; }
.stack-grid-wide { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }

@media (max-width: 640px) {
    .author { text-align: center; }
    .author-links { justify-content: center; }
}

/* ── Footer ── */
.footer { padding: 80px 0 40px; border-top: 1px solid var(--border); background: var(--bg2); }
.footer-summary { text-align: center; margin-bottom: 60px; }
.footer-summary h2 { font-size: 2rem; margin-bottom: 40px; }
.steps-final { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; }
.step-f { display: flex; align-items: center; gap: 10px; padding: 12px 20px; background: var(--card); border-radius: 12px; border: 1px solid var(--border); font-size: .95rem; }
.step-f span { width: 32px; height: 32px; border-radius: 8px; background: var(--purple); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 800; flex-shrink: 0; }
.footer-bottom { text-align: center; color: var(--text2); font-size: .9rem; }

/* ── Animations ── */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity .6s ease, transform .6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 768px) {
    .section-header h2 { font-size: 1.8rem; }
    .section-number { font-size: 3.5rem; }
    .hero h1 { font-size: 2.2rem; }
}