/* Layout: one narrow reading column on a night-blue ground; the hero pairs the pitch with a sample warranty slip. */
:root {
  --ground: #070b14;
  --panel: #0e1524;
  --line: #1f2a40;
  --ink: #e8eef8;
  --muted: #9aa8bf;
  --accent: #4ea1ff;
  --accent-ink: #04101f;
  --display: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --body: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --tech: "Chakra Petch", "Noto Sans TC", ui-monospace, monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.75;
  padding-inline: 20px;
}
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: 980px; margin-inline: auto; }
.prose { max-width: 680px; }

/* Header */
.site-head {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  flex-wrap: wrap; padding-block: 20px;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }
.brand span { font-family: var(--tech); font-size: 20px; letter-spacing: 0.02em; }
.nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: 15px; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }

/* Hero */
.hero {
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 48px; align-items: center; padding-block: 64px 56px;
}
.eyebrow { font-family: var(--tech); font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); margin: 0 0 12px; }
.hero h1 {
  font-family: var(--display); font-weight: 900; font-size: clamp(36px, 6vw, 58px);
  line-height: 1.15; margin: 0 0 20px; text-wrap: balance; letter-spacing: 0.01em;
}
.hero h1 em { font-style: normal; color: var(--accent); }
.lead { font-size: 18px; color: var(--muted); margin: 0 0 28px; max-width: 34em; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px;
  padding-inline: 22px; border-radius: 10px; font-weight: 700; text-decoration: none;
  background: var(--accent); color: var(--accent-ink);
}
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn.ghost:hover { border-color: var(--accent); }

/* Sample warranty slip */
.slip {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  padding: 22px 22px 18px; position: relative;
  box-shadow: 0 0 0 1px rgba(78, 161, 255, 0.08), 0 24px 60px -30px rgba(78, 161, 255, 0.45);
}
.slip-tag { font-family: var(--tech); font-size: 12px; letter-spacing: 0.12em; color: var(--muted); display: flex; justify-content: space-between; margin-bottom: 14px; }
.slip h2 { font-size: 20px; margin: 0 0 14px; }
.slip dl { margin: 0; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 6px 16px; font-size: 15px; }
.slip dt { color: var(--muted); }
.slip dd { margin: 0; font-family: var(--tech); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.slip .perf { border-top: 2px dashed var(--line); margin: 16px -22px 14px; }
.slip .left { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.slip .left b { font-family: var(--tech); font-size: 34px; color: var(--accent); font-variant-numeric: tabular-nums; }
.slip .left span { color: var(--muted); font-size: 14px; }

/* Sections */
.section { padding-block: 48px; border-top: 1px solid var(--line); }
.section h2 { font-size: 26px; margin: 0 0 24px; text-wrap: balance; }
.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px 32px; }
.features h3 { font-size: 17px; margin: 0 0 6px; }
.features p { margin: 0; color: var(--muted); font-size: 15px; }
.promise { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; list-style: none; padding: 0; margin: 0; }
.promise li { border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.promise b { display: block; font-size: 17px; margin-bottom: 4px; }
.promise span { color: var(--muted); font-size: 15px; }

/* Document pages */
.doc { padding-block: 48px 64px; }
.doc h1 { font-size: clamp(28px, 4.5vw, 38px); font-weight: 900; margin: 0 0 8px; text-wrap: balance; }
.doc .meta { color: var(--muted); font-size: 14px; margin: 0 0 32px; font-family: var(--tech); }
.doc h2 { font-size: 20px; margin: 36px 0 10px; }
.doc p, .doc li { color: #cdd6e4; }
.doc ol, .doc ul { padding-left: 1.4em; }
.doc li + li { margin-top: 6px; }
.steps { counter-reset: s; list-style: none; padding: 0; display: grid; gap: 14px; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 12px; align-items: start; border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
.steps li::before { content: counter(s); font-family: var(--tech); font-weight: 700; font-size: 22px; color: var(--accent); line-height: 1.4; }
.note { border-left: 3px solid var(--accent); background: var(--panel); padding: 14px 16px; border-radius: 0 10px 10px 0; color: var(--ink); }
.faq dt { font-weight: 700; margin-top: 22px; }
.faq dd { margin: 4px 0 0; color: #cdd6e4; }
code, .mono { font-family: var(--tech); font-size: 0.95em; overflow-wrap: anywhere; }

/* Footer */
.site-foot { border-top: 1px solid var(--line); padding-block: 28px 40px; color: var(--muted); font-size: 14px; display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.site-foot nav { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.site-foot a { color: var(--muted); }

@media (max-width: 760px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 36px; padding-block: 40px; }
  .features, .promise { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: no-preference) {
  .slip { animation: rise 0.6s ease-out both; }
  @keyframes rise { from { transform: translateY(8px); } to { transform: none; } }
}