/* Shi Cheng Trading Limited — institutional site
   Plain CSS, no build step, no external assets. */

:root {
  --ink:        #16202c;
  --ink-soft:   #4a5766;
  --ink-faint:  #6b7887;
  --line:       #dfe4ea;
  --bg:         #ffffff;
  --bg-alt:     #f6f8fa;
  --accent:     #1f4b7a;
  --accent-ink: #16385c;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, "PingFang HK", "Noto Sans CJK HK",
               "Microsoft JhengHei", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px;
}

.wrap.narrow { max-width: 720px; }

a { color: var(--accent); }
a:hover { color: var(--accent-ink); }

h1, h2, h3 {
  line-height: 1.25;
  letter-spacing: -0.011em;
  color: var(--ink);
}

/* ---------- header ---------- */

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  flex-wrap: wrap;
  padding-top: 12px;
  padding-bottom: 12px;
}

.brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--ink);
}

.brand-zh {
  font-size: 15px;
  color: var(--ink-soft);
  letter-spacing: 0.06em;
}

.brand-en {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 15px;
}

.site-nav a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- hero ---------- */

.hero {
  padding: 84px 0 68px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.eyebrow {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(32px, 5.2vw, 46px);
  font-weight: 650;
}

.lede {
  margin: 0;
  max-width: 60ch;
  font-size: 19px;
  color: var(--ink-soft);
}

/* ---------- sections ---------- */

.section { padding: 64px 0; }
.section.alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 22px;
  font-size: 25px;
  font-weight: 640;
}

.section h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 620;
}

.section p { margin: 0 0 16px; }
.section p:last-child { margin-bottom: 0; }

/* ---------- cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
}

.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 26px 24px;
}

.card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 16px;
}

/* ---------- product ---------- */

.product {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 26px 24px;
  background: var(--bg);
}

.product-meta {
  margin: 0 0 12px !important;
  font-size: 14px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.product p { color: var(--ink-soft); }

.product-links {
  margin: 16px 0 0 !important;
  font-size: 15px;
}

.product-links span { color: var(--ink-faint); margin: 0 6px; }

/* ---------- definition list ---------- */

.facts {
  margin: 0;
  border-top: 1px solid var(--line);
}

.facts > div {
  display: grid;
  grid-template-columns: 230px 1fr;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.facts dt {
  color: var(--ink-faint);
  font-size: 15px;
}

.facts dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 620px) {
  .facts > div { grid-template-columns: 1fr; gap: 4px; }
}

/* ---------- contact ---------- */

.contact {
  font-style: normal;
  padding: 20px 22px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  margin: 0 0 16px;
}

.note {
  font-size: 15px;
  color: var(--ink-soft);
}

/* ---------- prose pages ---------- */

.page-head {
  padding: 56px 0 28px;
  border-bottom: 1px solid var(--line);
}

.page-head h1 {
  margin: 0 0 10px;
  font-size: clamp(28px, 4.4vw, 38px);
  font-weight: 650;
}

.page-head .updated {
  margin: 0;
  color: var(--ink-faint);
  font-size: 15px;
}

.prose { padding: 40px 0 72px; }
.prose h2 {
  margin: 36px 0 12px;
  font-size: 21px;
  font-weight: 640;
}
.prose h2:first-child { margin-top: 0; }
.prose p, .prose li { color: var(--ink-soft); }
.prose p { margin: 0 0 15px; }
.prose ul { margin: 0 0 15px; padding-left: 22px; }
.prose li { margin-bottom: 7px; }

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 30px 0;
  background: var(--bg);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.site-footer p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-faint);
}

.footer-nav {
  display: flex;
  gap: 20px;
}

.footer-nav a {
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
}

.footer-nav a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- dark mode ---------- */

@media (prefers-color-scheme: dark) {
  :root {
    --ink:       #e8edf3;
    --ink-soft:  #a9b6c5;
    --ink-faint: #8593a4;
    --line:      #27323f;
    --bg:        #0f151c;
    --bg-alt:    #141c25;
    --accent:    #7fb2e5;
    --accent-ink:#a7ccf2;
  }
  .hero { background: linear-gradient(180deg, #141c25 0%, #0f151c 100%); }
}

/* ---------- accessibility ---------- */

a:focus-visible,
.brand:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}