:root {
  --bg: #0b1220;
  --bg2: #111a2e;
  --card: #151f35;
  --border: #24304a;
  --text: #e8eefc;
  --muted: #9aabc9;
  --brand: #2dd4bf;
  --brand-dim: #0f766e;
  --accent: #60a5fa;
  --warn: #fbbf24;
  --danger: #f87171;
  --ok: #34d399;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  --radius: 16px;
  --max: 1080px;
  --font: "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }
body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(45, 212, 191, 0.12), transparent 50%),
    radial-gradient(900px 500px at 100% 0%, rgba(96, 165, 250, 0.1), transparent 45%),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(var(--max), calc(100% - 2rem)); margin: 0 auto; }

.skip {
  position: absolute; left: -999px; top: 0;
}
.skip:focus {
  left: 1rem; top: 0.5rem; z-index: 100;
  background: var(--brand); color: #042f2e;
  padding: 0.4rem 0.7rem; border-radius: 8px;
}

.topnav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(11, 18, 32, 0.88);
  border-bottom: 1px solid var(--border);
}
.topnav-inner {
  display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between; gap: 0.75rem; padding: 0.75rem 0;
}
.brand {
  display: flex; align-items: center; gap: 0.65rem;
  font-weight: 700; color: var(--text); text-decoration: none;
}
.brand img {
  width: 2.15rem; height: 2.15rem; border-radius: 0.55rem;
  border: 1px solid var(--border); background: #000; object-fit: cover;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text small { font-weight: 500; color: var(--muted); font-size: 0.72rem; letter-spacing: 0.04em; }
.nav-links { display: flex; flex-wrap: wrap; gap: 0.25rem 0.35rem; font-size: 0.88rem; }
.nav-links a {
  color: var(--muted); padding: 0.35rem 0.55rem; border-radius: 999px; text-decoration: none;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text); background: rgba(45, 212, 191, 0.12);
}
.nav-toggle {
  display: none; border: 1px solid var(--border); background: var(--card);
  color: var(--text); border-radius: 8px; padding: 0.4rem 0.7rem; cursor: pointer;
}

.search-bar {
  display: flex; gap: 0.5rem; align-items: center;
  margin: 0.2rem 0 0;
}
.search-bar input {
  flex: 1; min-width: 0;
  background: #0a101c; border: 1px solid var(--border); color: var(--text);
  border-radius: 10px; padding: 0.55rem 0.8rem; font: inherit;
}
.search-bar input:focus { outline: 2px solid rgba(45, 212, 191, 0.45); border-color: var(--brand); }
.search-meta { color: var(--muted); font-size: 0.82rem; white-space: nowrap; }
.search-hint { color: var(--muted); font-size: 0.8rem; margin: 0.45rem 0 0; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.hero { padding: 2.6rem 0 1.2rem; }
.hero h1 {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1.2; margin: 0 0 0.75rem; letter-spacing: -0.02em;
}
.lead { color: var(--muted); font-size: 1.05rem; max-width: 46rem; margin: 0 0 1.1rem; }
.badge-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; }
.badge {
  display: inline-flex; align-items: center; gap: 0.35rem;
  border: 1px solid var(--border); background: rgba(255,255,255,0.03);
  color: var(--muted); border-radius: 999px; padding: 0.25rem 0.7rem;
  font-size: 0.8rem; font-weight: 600;
}
.badge.ok { color: var(--ok); border-color: rgba(52, 211, 153, 0.35); }
.badge.warn { color: var(--warn); border-color: rgba(251, 191, 36, 0.35); }
.badge.brand { color: var(--brand); border-color: rgba(45, 212, 191, 0.35); }

.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  border-radius: 10px; padding: 0.55rem 0.95rem; font-weight: 650;
  border: 1px solid var(--border); color: var(--text); text-decoration: none;
  background: rgba(255,255,255,0.04);
}
.btn:hover { text-decoration: none; background: rgba(45, 212, 191, 0.12); }
.btn.primary { background: var(--brand); color: #042f2e; border-color: transparent; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1rem; }
.hero-figure { margin: 1.6rem 0 0; }
.hero-figure img {
  width: 100%; height: auto; display: block;
  border-radius: var(--radius); border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.hero-figure figcaption { color: var(--muted); font-size: 0.82rem; margin-top: 0.45rem; }
.toc-section .card { text-decoration: none; color: inherit; }
.toc-section .card:hover { border-color: var(--brand); }
.toc-section .card h3 { color: var(--text); }
.flow {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.45rem;
  margin: 1rem 0;
}
.flow-item {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 999px; padding: 0.4rem 0.85rem; font-weight: 650; font-size: 0.88rem;
}
.flow-item.accent { border-color: var(--brand); color: var(--brand); }
.flow-join { color: var(--muted); font-size: 0.78rem; }
.muted-note { font-size: 0.9rem; }
.glyph-row { display: flex; gap: 1.4rem; margin: 0.9rem 0 1rem; }
.glyph { display: flex; flex-direction: column; align-items: center; gap: 0.35rem; }
.glyph .dot {
  width: 1.15rem; height: 1.15rem; border-radius: 999px; border: 2px solid var(--border);
}
.glyph .dot.on { background: #fde68a; box-shadow: 0 0 10px rgba(253, 230, 138, 0.7); }
.glyph .dot.off { background: #334155; }
.glyph .dot.offline { background: transparent; border-style: dashed; border-color: var(--danger); }
.glyph small { color: var(--muted); font-size: 0.8rem; }
.glossary { margin: 0.6rem 0 0; }
.glossary > div {
  display: grid; grid-template-columns: 8rem 1fr; gap: 0.6rem;
  padding: 0.65rem 0; border-bottom: 1px solid var(--border);
}
.glossary dt { color: var(--text); font-weight: 650; }
.glossary dd { margin: 0; color: var(--muted); }
.search-empty {
  margin: 1.5rem 0; padding: 1rem; border: 1px dashed var(--border);
  border-radius: 12px; color: var(--muted); text-align: center;
}
.footer-inner { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
@media (max-width: 640px) {
  .glossary > div { grid-template-columns: 1fr; gap: 0.15rem; }
}

.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent 40%), var(--card);
  border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 1.25rem 1.35rem;
}
.card h3 { margin: 0 0 0.35rem; font-size: 1.05rem; }
.card p { color: var(--muted); margin: 0.35rem 0 0; }
.card a.more { display: inline-block; margin-top: 0.85rem; font-weight: 600; }

main { padding-bottom: 4rem; }
section { margin: 2.6rem 0 3rem; }
h2 { font-size: 1.4rem; margin: 0 0 0.55rem; letter-spacing: -0.01em; }
h3 { font-size: 1.08rem; margin: 1.3rem 0 0.4rem; }
p { margin: 0.45rem 0; color: var(--muted); }
.prose p, .prose li { color: var(--muted); }
strong { color: var(--text); }
ul, ol { color: var(--muted); padding-left: 1.25rem; }
li { margin: 0.28rem 0; }

.table-wrap {
  overflow-x: auto; border: 1px solid var(--border);
  border-radius: 12px; background: var(--card); margin: 0.8rem 0;
}
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td {
  text-align: left; padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--border); vertical-align: top;
}
th { background: rgba(255,255,255,0.03); color: var(--text); font-weight: 600; white-space: nowrap; }
td { color: var(--muted); }
tr:last-child td { border-bottom: none; }

code, .mono { font-family: var(--mono); font-size: 0.88em; }
code {
  background: rgba(45, 212, 191, 0.1); color: #99f6e4;
  padding: 0.1rem 0.35rem; border-radius: 0.35rem;
}
pre {
  background: #0a101c; border: 1px solid var(--border); border-radius: 12px;
  padding: 1rem 1.1rem; overflow-x: auto; color: #dbe7ff;
  font-family: var(--mono); font-size: 0.84rem; line-height: 1.55;
}
pre code { background: none; padding: 0; color: inherit; }

.diagram {
  font-family: var(--mono); font-size: 0.78rem; line-height: 1.5;
  white-space: pre; overflow-x: auto; background: #0a101c;
  border: 1px solid var(--border); border-radius: 12px;
  padding: 1.1rem; color: #b8c9e8;
}

.callout {
  border: 1px solid var(--border); border-left: 4px solid var(--brand);
  background: rgba(45, 212, 191, 0.07); border-radius: 12px;
  padding: 0.85rem 1rem; color: var(--muted); margin: 0.9rem 0;
}
.callout.warn { border-left-color: var(--warn); background: rgba(251, 191, 36, 0.08); }
.callout.danger { border-left-color: var(--danger); background: rgba(248, 113, 113, 0.08); }

.steps { counter-reset: step; list-style: none; padding: 0; margin: 0.6rem 0 0; }
.steps li {
  position: relative; padding: 0.9rem 0.9rem 0.9rem 3.2rem;
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--card); margin: 0.65rem 0; color: var(--muted);
}
.steps li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0.85rem; top: 0.95rem;
  width: 1.6rem; height: 1.6rem; border-radius: 999px;
  background: var(--brand-dim); color: #ecfeff;
  display: grid; place-items: center; font-weight: 700; font-size: 0.85rem;
}

kbd {
  font-family: var(--mono); font-size: 0.82em;
  border: 1px solid var(--border); background: #0a101c;
  padding: 0.05rem 0.35rem; border-radius: 6px; color: var(--text);
}

.toc-card ol { margin: 0.3rem 0 0; padding-left: 1.2rem; }
.toc-card a { color: var(--muted); }
.toc-card a:hover { color: var(--brand); }

footer {
  border-top: 1px solid var(--border); padding: 1.5rem 0 2.2rem;
  color: var(--muted); font-size: 0.88rem;
}
.hidden { display: none !important; }
mark {
  background: rgba(251, 191, 36, 0.28); color: var(--text);
  border-radius: 3px; padding: 0 0.12em;
}

@media (max-width: 800px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    display: none; width: 100%;
    flex-direction: column; padding-bottom: 0.4rem;
  }
  .nav-links.open { display: flex; }
}

.shot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.1rem 0 0;
}
.shot {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.shot img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: top;
  background: #000;
}
.shot figcaption {
  padding: 0.75rem 1rem 1rem;
  color: var(--muted);
  font-size: 0.88rem;
}
.shot figcaption strong {
  display: block;
  color: var(--text);
  margin-bottom: 0.2rem;
}
.cta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: center;
  margin-top: 1.1rem;
}
.store-note {
  font-size: 0.82rem;
  color: var(--muted);
}
.two-col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

@media print {
  .topnav, .hero-actions, .search-bar, .nav-toggle { display: none !important; }
  body { background: #fff; color: #111; }
  p, li, td, .lead, .callout { color: #333; }
  h1, h2, h3, strong { color: #111; }
  a { color: #0f766e; }
  .card, .table-wrap, .steps li { box-shadow: none; border-color: #ccc; }
}


/* Magnet-style story sections */
.story {
  padding: 4.5rem 0;
  border-top: 1px solid var(--border);
}
.story.alt { background: rgba(17, 26, 46, 0.55); }
.story.band {
  background: linear-gradient(135deg, rgba(45,212,191,0.12), rgba(96,165,250,0.08));
  text-align: center;
}
.story-hero { padding-top: 2.5rem; }
.story-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}
.story-grid.reverse .story-copy { order: 2; }
.story-grid.reverse .story-media { order: 1; }
.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--brand);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.story h2 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.55rem, 3.2vw, 2.15rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.story .lead { color: var(--muted); font-size: 1.05rem; max-width: 36em; }
.story .lead.narrow { margin-inline: auto; }
.story-center { max-width: 40rem; margin: 0 auto; }
.story-center .lead { margin-inline: auto; }
.story .note {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--warn);
}
.phone-frame {
  margin: 0;
  border-radius: 28px;
  padding: 0.65rem;
  background: #05080f;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.phone-frame img {
  display: block;
  width: 100%;
  border-radius: 20px;
}
.placeholder { margin: 0; }
.placeholder-card {
  min-height: 280px;
  display: grid;
  place-content: center;
  text-align: center;
  border-radius: 24px;
  border: 1px dashed var(--border);
  background: var(--card);
  color: var(--muted);
  font-weight: 700;
  font-size: 1.1rem;
}
.placeholder-card span { display: block; margin-top: 0.35rem; font-weight: 500; font-size: 0.9rem; color: var(--brand); }
.compat-list {
  color: var(--muted);
  line-height: 1.9;
  padding-left: 1.2rem;
}
@media (max-width: 860px) {
  .story-grid, .story-grid.reverse { grid-template-columns: 1fr; }
  .story-grid.reverse .story-copy,
  .story-grid.reverse .story-media { order: unset; }
  .story { padding: 3rem 0; }
}