:root {
  --navy: #1a2744;
  --navy-soft: #2c3a56;
  --gold: #b8955e;
  --muted: #5d6573;
  --line: #e6e2da;
  --bg: #f7f5f1;
  --paper: #ffffff;
  --max: 70rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Noto Sans TC", sans-serif;
  color: var(--navy);
  background: var(--bg);
  font-size: 17px;
  line-height: 1.7;
}

img { max-width: 100%; display: block; }
a { color: var(--navy); }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

header.site {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.25rem;
  gap: 1rem;
}
.brand {
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  font-size: 1.05rem;
}
nav.main {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.2rem 1.35rem;
}
nav.main a {
  text-decoration: none;
  color: var(--navy-soft);
  font-size: 0.92rem;
}
nav.main a:hover { color: var(--navy); }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--navy);
  color: #f7f5f1;
  text-decoration: none;
  padding: 0.55rem 1.05rem;
  border-radius: 4px;
  font-size: 0.9rem;
  border: 0;
  cursor: pointer;
}
.btn.ghost {
  background: transparent;
  color: var(--navy);
  border: 1px solid var(--navy);
}
.btn.gold {
  background: transparent;
  color: var(--gold);
  border: 1px solid var(--gold);
}

.hero {
  min-height: calc(100vh - 4.25rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 1.5rem 3rem;
  position: relative;
}
.hero .kicker {
  color: var(--gold);
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  margin: 0 0 1.4rem;
}
.hero h1 {
  font-size: clamp(2rem, 4.6vw, 3.15rem);
  font-weight: 700;
  line-height: 1.28;
  margin: 0 0 1.3rem;
  max-width: 18em;
}
.hero .lede {
  max-width: 36rem;
  color: var(--muted);
  margin: 0 auto 1.8rem;
}
.hero .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}
.scroll-hint {
  margin-top: 3.5rem;
  color: var(--gold);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
}
.scroll-hint::after {
  content: "";
  display: block;
  width: 1px;
  height: 2.2rem;
  background: var(--gold);
  margin: 0.5rem auto 0;
}

.sec {
  padding: 4.5rem 0;
}
.sec.paper { background: var(--paper); }
.sec.dark {
  background: var(--navy);
  color: #eef1f6;
}
.sec.dark .muted,
.sec.dark .sub { color: #b7c0ce; }
.sec.dark h2 { color: #fff; }

.eyebrow {
  color: var(--gold);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  margin: 0 0 0.85rem;
}
h2 {
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 0.9rem;
}
.sub {
  color: var(--muted);
  margin: 0;
  max-width: 34rem;
}

.head-row {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
@media (min-width: 800px) {
  .head-row { grid-template-columns: 1.1fr 0.9fr; align-items: end; }
}

.domains {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.domains article {
  display: grid;
  gap: 0.6rem 1.5rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
}
@media (min-width: 800px) {
  .domains article { grid-template-columns: 3.5rem 12rem 1fr; align-items: start; }
}
.num {
  font-variant-numeric: tabular-nums;
  color: var(--gold);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}
.domains h3 {
  margin: 0;
  font-size: 1.05rem;
}
.tag {
  display: inline-block;
  font-size: 0.72rem;
  color: var(--gold);
  border: 1px solid var(--gold);
  padding: 0.08rem 0.4rem;
  margin-left: 0.4rem;
  vertical-align: middle;
}
.domains p { margin: 0; color: var(--muted); }

.product {
  display: grid;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 880px) {
  .product { grid-template-columns: 1.05fr 0.95fr; }
}
.product img {
  width: 100%;
  height: 20rem;
  object-fit: cover;
}
.product p { color: var(--muted); }

.steps {
  display: grid;
  gap: 2rem;
}
@media (min-width: 800px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.steps article h3 { margin: 0.4rem 0 0.5rem; font-size: 1.1rem; }
.steps p { margin: 0; color: var(--muted); }

.case {
  display: grid;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 800px) { .case { grid-template-columns: 1fr 1fr; } }
.case img {
  width: 100%;
  height: 19rem;
  object-fit: cover;
}
.stats {
  display: flex;
  gap: 1.8rem;
  margin-top: 1.4rem;
  flex-wrap: wrap;
}
.stats div { min-width: 6rem; }
.stats strong { display: block; font-size: 1.25rem; }
.stats span { font-size: 0.82rem; color: var(--muted); }

.cta-block { text-align: left; }
.cta-block .actions { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 1.4rem; }
.sec.dark .btn {
  background: #fff;
  color: var(--navy);
}
.sec.dark a.mail { color: var(--gold); }

footer.site {
  border-top: 1px solid var(--line);
  padding: 2.2rem 0 2.8rem;
  font-size: 0.88rem;
  color: var(--muted);
}
footer.site .grid {
  display: grid;
  gap: 1.2rem;
}
@media (min-width: 720px) {
  footer.site .grid { grid-template-columns: 1.4fr 1fr 1fr; }
}
footer.site a { text-decoration: none; color: var(--muted); }
footer.site a:hover { color: var(--navy); }
footer.site p { margin: 0.3rem 0; }
footer.site h4 {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--gold);
  font-weight: 500;
}

@media (max-width: 720px) {
  nav.main { display: none; }
  .hero { min-height: auto; padding-top: 3.2rem; }
  .product img, .case img { height: 16rem; }
}