/* AI 島：全端養成班 */
:root {
  --bg: #0a0a08; --bg-2: #14130f; --bg-3: #1c1a16;
  --paper: #f4ead5; --paper-dim: rgba(244,234,213,0.7); --paper-faint: rgba(244,234,213,0.4);
  --line: #2a2823; --line-2: #3a3730;
  --accent: #5fff87; --accent-dim: #2faa55; --secondary: #ffb13d;
  --green: #5fff87; --green-dim: #2faa55; --amber: #ffb13d;
  --pink: #ff5e8a; --blue: #6bb5ff; --purple: #c4a3ff; --cyan: #5fdbff; --red: #ff4d4d;
  --mono: 'JetBrains Mono', 'Courier New', monospace;
  --serif: 'Noto Serif TC', serif;
  --sans: 'Noto Sans TC', sans-serif;
  --max-width: 880px;
}
[data-theme="html"]    { --accent: #ffb13d; --accent-dim: #c8862a; --secondary: #ff5e8a; }
[data-theme="css"]     { --accent: #ff5e8a; --accent-dim: #c84266; --secondary: #ffb13d; }
[data-theme="js"]      { --accent: #ffd23d; --accent-dim: #c8a02a; --secondary: #ff5e8a; }
[data-theme="ts"]      { --accent: #6bb5ff; --accent-dim: #4a82c0; --secondary: #5fff87; }
[data-theme="ux"]      { --accent: #ff8fc8; --accent-dim: #c46898; --secondary: #c4a3ff; }
[data-theme="react"]   { --accent: #5fdbff; --accent-dim: #3a9bc8; --secondary: #c4a3ff; }
[data-theme="vue"]     { --accent: #5fff87; --accent-dim: #2faa55; --secondary: #ffb13d; }
[data-theme="next"]    { --accent: #f4ead5; --accent-dim: #b8a983; --secondary: #5fdbff; }
[data-theme="backend"] { --accent: #c4a3ff; --accent-dim: #8d6fc8; --secondary: #5fff87; }
[data-theme="db"]      { --accent: #5fff87; --accent-dim: #2faa55; --secondary: #6bb5ff; }
[data-theme="deploy"]  { --accent: #5fdbff; --accent-dim: #3a9bc8; --secondary: #ffb13d; }
[data-theme="domain"]  { --accent: #ffb13d; --accent-dim: #c8862a; --secondary: #6bb5ff; }
[data-theme="security"]{ --accent: #ff4d4d; --accent-dim: #c83838; --secondary: #ffd23d; }
[data-theme="seo"]     { --accent: #5fff87; --accent-dim: #2faa55; --secondary: #ffb13d; }
[data-theme="mobile"]  { --accent: #ff8fc8; --accent-dim: #c46898; --secondary: #5fdbff; }
[data-theme="ai"]      { --accent: #c4a3ff; --accent-dim: #8d6fc8; --secondary: #5fff87; }
[data-theme="vibe"]    { --accent: #5fff87; --accent-dim: #2faa55; --secondary: #c4a3ff; }
[data-theme="biz"]     { --accent: #ffd23d; --accent-dim: #c8a02a; --secondary: #5fff87; }
[data-theme="json"]    { --accent: #5fdbff; --accent-dim: #3a9bc8; --secondary: #ffb13d; }
[data-theme="life"]    { --accent: #ffa05f; --accent-dim: #c87a3a; --secondary: #5fff87; }
[data-theme="home"]    { --accent: #5fff87; --accent-dim: #2faa55; --secondary: #ffb13d; }

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg); color: var(--paper);
  font-family: var(--sans); line-height: 1.75; overflow-x: hidden;
  background-image:
    radial-gradient(circle at 20% 10%, color-mix(in srgb, var(--accent) 5%, transparent) 0%, transparent 40%),
    radial-gradient(circle at 80% 60%, color-mix(in srgb, var(--secondary) 4%, transparent) 0%, transparent 50%);
  min-height: 100vh;
}
body::before {
  content: ''; position: fixed; inset: 0;
  background-image: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255,255,255,0.012) 2px, rgba(255,255,255,0.012) 4px);
  pointer-events: none; z-index: 1;
}

nav.site-nav { position: sticky; top: 0; z-index: 100; background: rgba(10,10,8,0.92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.nav-inner { max-width: 1400px; margin: 0 auto; padding: 14px 28px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo { font-family: var(--mono); font-weight: 800; font-size: 13px; letter-spacing: 0.05em; color: var(--accent); text-decoration: none; white-space: nowrap; }
.logo::before { content: '> '; color: var(--secondary); }
.nav-toggle { display: none; background: none; border: 1px solid var(--line-2); color: var(--paper); font-family: var(--mono); font-size: 12px; padding: 6px 12px; cursor: pointer; border-radius: 2px; }
.nav-links { display: flex; gap: 2px; flex-wrap: wrap; }
.nav-links a { font-family: var(--mono); font-size: 11px; color: var(--paper); text-decoration: none; padding: 6px 10px; border: 1px solid transparent; border-radius: 2px; transition: all 0.2s; white-space: nowrap; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); border-color: var(--accent-dim); background: color-mix(in srgb, var(--accent) 6%, transparent); }

.content { max-width: var(--max-width); margin: 0 auto; padding: 60px 32px 120px; position: relative; z-index: 2; }

.ch-header { margin-bottom: 64px; padding-bottom: 40px; border-bottom: 2px solid var(--accent-dim); }
.ch-header .label { font-family: var(--mono); font-size: 12px; color: var(--secondary); letter-spacing: 0.15em; margin-bottom: 16px; }
.ch-header h1 { font-family: var(--serif); font-size: clamp(40px, 6vw, 76px); font-weight: 900; line-height: 0.95; letter-spacing: -0.02em; margin-bottom: 24px; }
.ch-header h1 .accent { color: var(--accent); }
.ch-header .lead { font-size: 18px; color: var(--paper-dim); line-height: 1.8; max-width: 700px; }

.outcomes { margin-top: 32px; padding: 24px 28px; background: var(--bg-2); border: 1px solid var(--line-2); border-radius: 4px; }
.outcomes::before { content: '🎯 學完這章你能做到'; display: block; font-family: var(--mono); font-size: 12px; color: var(--accent); margin-bottom: 16px; letter-spacing: 0.1em; }
.outcomes ul { margin: 0; padding-left: 20px; }
.outcomes li { margin-bottom: 8px; color: var(--paper); }
.outcomes li::marker { color: var(--accent); }

.lesson { margin-bottom: 80px; }
.lesson-num { font-family: var(--mono); font-size: 13px; color: var(--accent); letter-spacing: 0.15em; margin-bottom: 12px; }
.lesson h2 { font-family: var(--serif); font-size: 36px; font-weight: 900; line-height: 1.1; margin-bottom: 24px; letter-spacing: -0.01em; }
.lesson h3 { font-family: var(--serif); font-size: 22px; font-weight: 700; margin: 40px 0 16px; }
.lesson h4 { font-family: var(--mono); font-size: 13px; color: var(--secondary); margin: 24px 0 12px; letter-spacing: 0.05em; text-transform: uppercase; }
.lesson p { margin-bottom: 16px; color: rgba(244,234,213,0.88); font-size: 16px; line-height: 1.85; }
.lesson p strong { color: var(--accent); font-weight: 700; }
.lesson p em { color: var(--secondary); font-style: normal; font-family: var(--mono); font-size: 0.95em; }
.lesson ul, .lesson ol { margin: 16px 0 24px 24px; color: rgba(244,234,213,0.85); }
.lesson li { margin-bottom: 10px; line-height: 1.7; }
.lesson li::marker { color: var(--accent); }

p code, li code, td code { font-family: var(--mono); background: color-mix(in srgb, var(--accent) 10%, transparent); color: var(--accent); padding: 2px 6px; border-radius: 3px; font-size: 0.9em; }

.analogy, .warning, .tip, .pro, .danger { padding: 24px 28px; margin: 32px 0; border-radius: 0 4px 4px 0; }
.analogy { background: linear-gradient(135deg, rgba(255,177,61,0.08), rgba(255,177,61,0.02)); border-left: 3px solid var(--amber); }
.analogy::before { content: '☕ 用人話講'; display: block; font-family: var(--mono); font-size: 12px; color: var(--amber); margin-bottom: 12px; letter-spacing: 0.1em; }
.warning { background: linear-gradient(135deg, rgba(255,94,138,0.1), rgba(255,94,138,0.02)); border-left: 3px solid var(--pink); }
.warning::before { content: '⚠ 踩雷警告'; display: block; font-family: var(--mono); font-size: 12px; color: var(--pink); margin-bottom: 12px; letter-spacing: 0.1em; }
.tip { background: linear-gradient(135deg, rgba(95,255,135,0.06), rgba(95,255,135,0.01)); border-left: 3px solid var(--green); }
.tip::before { content: '✨ 接案小技巧'; display: block; font-family: var(--mono); font-size: 12px; color: var(--green); margin-bottom: 12px; letter-spacing: 0.1em; }
.pro { background: linear-gradient(135deg, rgba(196,163,255,0.08), rgba(196,163,255,0.02)); border-left: 3px solid var(--purple); }
.pro::before { content: '🚀 進階技巧'; display: block; font-family: var(--mono); font-size: 12px; color: var(--purple); margin-bottom: 12px; letter-spacing: 0.1em; }
.danger { background: linear-gradient(135deg, rgba(255,77,77,0.1), rgba(255,77,77,0.02)); border-left: 3px solid var(--red); }
.danger::before { content: '🚨 資安警報'; display: block; font-family: var(--mono); font-size: 12px; color: var(--red); margin-bottom: 12px; letter-spacing: 0.1em; }
.analogy p, .warning p, .tip p, .pro p, .danger p { margin: 0 0 8px; color: var(--paper); }
.analogy p:last-child, .warning p:last-child, .tip p:last-child, .pro p:last-child, .danger p:last-child { margin-bottom: 0; }

pre { background: #050504; border: 1px solid var(--line); border-radius: 4px; padding: 24px; overflow-x: auto; margin: 24px 0; position: relative; font-family: var(--mono); font-size: 13px; line-height: 1.7; }
pre::before { content: attr(data-lang); position: absolute; top: 0; right: 0; background: var(--accent-dim); color: var(--bg); font-family: var(--mono); font-size: 10px; padding: 4px 10px; letter-spacing: 0.1em; font-weight: 700; }
pre code { color: var(--paper); font-family: var(--mono); background: none; padding: 0; }
.tag { color: var(--pink); }
.attr { color: var(--amber); }
.str { color: var(--green); }
.kw { color: var(--blue); font-weight: 700; }
.com { color: #5a574e; font-style: italic; }
.num { color: var(--amber); }
.fn { color: var(--purple); }
.op { color: var(--cyan); }

.demo { border: 1px solid var(--line); border-radius: 4px; margin: 32px 0; overflow: hidden; }
.demo-header { background: var(--bg-2); padding: 8px 16px; display: flex; align-items: center; gap: 8px; border-bottom: 1px solid var(--line); }
.demo-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.demo-dot.r { background: #ff6058; } .demo-dot.y { background: #ffbc2f; } .demo-dot.g { background: #28c93f; }
.demo-title { font-family: var(--mono); font-size: 11px; color: rgba(244,234,213,0.6); margin-left: 12px; }
.demo iframe { width: 100%; border: 0; background: white; display: block; min-height: 200px; }

.exercise { background: var(--bg-2); border: 1px dashed var(--accent-dim); padding: 28px; margin: 40px 0; border-radius: 4px; }
.exercise::before { content: '🔨 動手練習'; display: block; font-family: var(--mono); font-size: 12px; color: var(--accent); margin-bottom: 16px; letter-spacing: 0.15em; }
.exercise h4 { font-family: var(--serif); font-size: 20px; color: var(--paper); margin: 0 0 12px; text-transform: none; letter-spacing: 0; }
.exercise p { margin-bottom: 12px; color: var(--paper); }

table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 14px; }
th, td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--line); }
th { font-family: var(--mono); font-size: 11px; color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase; border-bottom: 2px solid var(--accent-dim); }
td { color: rgba(244,234,213,0.85); }
td code { font-size: 12px; }

.faq-section { margin-top: 80px; padding-top: 40px; border-top: 1px solid var(--line); }
.faq-section h2 { font-family: var(--serif); font-size: 32px; font-weight: 900; margin-bottom: 8px; }
.faq-section .sub { font-family: var(--mono); font-size: 12px; color: var(--secondary); margin-bottom: 32px; letter-spacing: 0.1em; }
.faq-item { border-bottom: 1px solid var(--line); padding: 24px 0; }
.faq-q { font-family: var(--serif); font-size: 18px; font-weight: 700; margin-bottom: 12px; color: var(--accent); }
.faq-q::before { content: 'Q'; font-family: var(--mono); display: inline-block; margin-right: 12px; color: var(--secondary); }
.faq-a { color: rgba(244,234,213,0.88); padding-left: 28px; }
.faq-a::before { content: 'A'; font-family: var(--mono); display: inline-block; margin-right: 12px; margin-left: -28px; color: var(--accent); }

.ch-nav { display: flex; justify-content: space-between; gap: 16px; margin-top: 80px; padding-top: 40px; border-top: 1px solid var(--line); }
.ch-nav a { flex: 1; padding: 24px; border: 1px solid var(--line); text-decoration: none; color: var(--paper); transition: all 0.2s; border-radius: 4px; }
.ch-nav a:hover { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 4%, transparent); }
.ch-nav .dir { font-family: var(--mono); font-size: 11px; color: var(--accent-dim); margin-bottom: 8px; letter-spacing: 0.1em; }
.ch-nav .name { font-family: var(--serif); font-size: 18px; font-weight: 700; }
.ch-nav .next { text-align: right; }

footer { border-top: 1px solid var(--line); padding: 60px 32px; text-align: center; background: var(--bg-2); }
footer p { font-family: var(--mono); font-size: 12px; color: rgba(244,234,213,0.4); margin-bottom: 8px; }
footer .heart { color: var(--pink); }
footer a { color: var(--accent); text-decoration: none; }

/* HOMEPAGE */
.hero { max-width: 1400px; margin: 0 auto; padding: 80px 32px 100px; position: relative; z-index: 2; }
.hero-tag { font-family: var(--mono); font-size: 13px; color: var(--secondary); letter-spacing: 0.15em; margin-bottom: 24px; }
.hero-tag::before { content: '[ '; } .hero-tag::after { content: ' ]'; }
.hero h1 { font-family: var(--serif); font-size: clamp(48px, 8vw, 120px); font-weight: 900; line-height: 0.95; margin-bottom: 32px; letter-spacing: -0.02em; }
.hero h1 .accent { color: var(--accent); }
.hero h1 .strike { text-decoration: line-through; text-decoration-color: var(--pink); text-decoration-thickness: 6px; color: var(--paper); opacity: 0.5; }
.hero-sub { font-size: 18px; max-width: 640px; line-height: 1.8; color: var(--paper-dim); margin-bottom: 48px; }
.hero-meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 24px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 24px 0; max-width: 900px; }
.meta-item .k { font-family: var(--mono); font-size: 11px; color: var(--accent-dim); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 4px; }
.meta-item .v { font-family: var(--serif); font-size: 24px; font-weight: 700; }

.section { max-width: 1400px; margin: 0 auto; padding: 60px 32px 100px; position: relative; z-index: 2; }
.section-title { font-family: var(--mono); font-size: 12px; color: var(--secondary); letter-spacing: 0.2em; margin-bottom: 16px; }
.section-h { font-family: var(--serif); font-size: clamp(36px, 5vw, 64px); font-weight: 900; line-height: 1; margin-bottom: 60px; letter-spacing: -0.02em; }

.paths { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; margin-bottom: 80px; }
.path-card { background: var(--bg-2); border: 1px solid var(--line-2); padding: 32px; border-radius: 4px; transition: all 0.3s; }
.path-card:hover { border-color: var(--accent); }
.path-icon { font-size: 32px; margin-bottom: 16px; }
.path-title { font-family: var(--serif); font-size: 22px; font-weight: 900; margin-bottom: 8px; color: var(--accent); }
.path-desc { font-size: 14px; color: var(--paper-dim); margin-bottom: 16px; line-height: 1.6; }
.path-route { font-family: var(--mono); font-size: 11px; color: var(--secondary); letter-spacing: 0.05em; line-height: 1.8; }

.chapter-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2px; background: var(--line); border: 1px solid var(--line); }
.chapter-card { background: var(--bg); padding: 36px 28px; text-decoration: none; color: var(--paper); transition: all 0.3s; position: relative; overflow: hidden; display: block; }
.chapter-card:hover { background: var(--bg-2); }
.chapter-card::before { content: ''; position: absolute; top: 0; left: 0; width: 0; height: 3px; background: var(--ch-color, var(--accent)); transition: width 0.4s; }
.chapter-card:hover::before { width: 100%; }
.ch-num { font-family: var(--mono); font-size: 56px; font-weight: 800; color: var(--ch-color, var(--accent-dim)); line-height: 1; margin-bottom: 20px; opacity: 0.7; }
.chapter-card:hover .ch-num { opacity: 1; }
.ch-title { font-family: var(--serif); font-size: 24px; font-weight: 900; margin-bottom: 10px; line-height: 1.2; }
.ch-desc { font-size: 13px; color: var(--paper-dim); margin-bottom: 20px; line-height: 1.6; }
.ch-topics { display: flex; flex-wrap: wrap; gap: 6px; }
.ch-topics span { font-family: var(--mono); font-size: 10px; padding: 3px 8px; border: 1px solid var(--line); color: var(--paper-faint); border-radius: 2px; }

/* New index v2 styles */
.paths, .chapters, .why { max-width: 1400px; margin: 0 auto; padding: 60px 32px; }
.paths h2, .chapters h2, .why h2 { font-family: var(--serif); font-size: clamp(36px, 5vw, 56px); font-weight: 900; margin-bottom: 12px; color: var(--accent); }
.paths > p, .chapters > p { color: var(--paper-dim); margin-bottom: 36px; font-size: 16px; }
.path-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; margin-top: 24px; }
.path-card h3 { font-family: var(--serif); font-size: 22px; font-weight: 900; color: var(--accent); margin-bottom: 12px; }
.path-card .path-route { font-family: var(--mono); font-size: 11px; color: var(--secondary); letter-spacing: 0.05em; line-height: 1.8; margin-bottom: 12px; word-break: break-all; }
.path-card p:last-child { font-size: 14px; color: var(--paper-dim); line-height: 1.6; }

.ch-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 2px; background: var(--line); border: 1px solid var(--line); }
.ch-card { background: var(--bg); padding: 24px 20px; text-decoration: none; color: var(--paper); transition: all 0.3s; display: block; position: relative; overflow: hidden; }
.ch-card:hover { background: var(--bg-2); }
.ch-card::before { content: ''; position: absolute; top: 0; left: 0; width: 0; height: 3px; background: var(--accent); transition: width 0.4s; }
.ch-card:hover::before { width: 100%; }
.ch-card .ch-num { font-family: var(--mono); font-size: 14px; font-weight: 700; color: var(--accent); letter-spacing: 0.1em; margin-bottom: 8px; opacity: 0.85; }
.ch-card .ch-topic { font-family: var(--serif); font-size: 18px; font-weight: 900; line-height: 1.25; }

.why ul { list-style: none; padding: 0; }
.why li { padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 15px; color: var(--paper-dim); }
.why li strong { color: var(--accent); }

.cta { display: inline-block; padding: 16px 32px; background: var(--accent); color: var(--bg); font-family: var(--mono); font-size: 14px; font-weight: 700; letter-spacing: 0.1em; text-decoration: none; border-radius: 2px; transition: all 0.3s; }
.cta:hover { transform: translateY(-2px); box-shadow: 0 8px 24px color-mix(in srgb, var(--accent) 30%, transparent); }

.hero .lead { color: var(--paper-dim); font-size: 18px; line-height: 1.7; margin: 24px 0 36px; max-width: 800px; }
.hero .label { font-family: var(--mono); font-size: 13px; color: var(--secondary); letter-spacing: 0.15em; margin-bottom: 24px; }
.hero .accent { color: var(--accent); }

@media (max-width: 768px) {
  .nav-inner { padding: 12px 20px; flex-wrap: wrap; }
  .nav-toggle { display: block; }
  .nav-links { display: none; width: 100%; flex-direction: column; padding: 16px 0 0; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px; }
  .hero { padding: 48px 20px 60px; }
  .section { padding: 40px 20px 60px; }
  .content { padding: 40px 20px 80px; }
  .ch-nav { flex-direction: column; }
  .ch-nav .next { text-align: left; }
  pre { font-size: 12px; padding: 16px; }
  .hero-meta { grid-template-columns: 1fr 1fr; }
}