:root {
  --bg: #e8e4db;
  --bg-deep: #d9d3c7;
  --ink: #1a2332;
  --ink-soft: #3d4a5c;
  --muted: #6b7585;
  --panel: rgba(255, 252, 247, 0.92);
  --line: rgba(26, 35, 50, 0.12);
  --accent: #b33a2b;
  --accent-soft: #d4654a;
  --ok: #1f6b4a;
  --shadow: 0 18px 50px rgba(26, 35, 50, 0.12);
  --radius: 14px;
  --font-display: "ZCOOL XiaoWei", "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", sans-serif;
  --font-mono: "JetBrains Mono", "Consolas", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(179, 58, 43, 0.08), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(26, 35, 50, 0.08), transparent 50%),
    linear-gradient(165deg, var(--bg), var(--bg-deep));
}

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(26, 35, 50, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 35, 50, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 85%);
}

.wrap {
  position: relative;
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.15rem 0 3rem;
}

.topbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.35rem;
  animation: rise 0.5s ease both;
}

.brand { display: flex; flex-direction: column; gap: 0.18rem; text-decoration: none; color: inherit; }
.brand-mark {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 5vw, 3rem);
  letter-spacing: 0.1em;
  line-height: 1;
}
.brand-sub { color: var(--muted); font-size: 0.9rem; }

.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-burger {
  display: none;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 999px;
  padding: 0.5rem 0.95rem;
  cursor: pointer;
  font: inherit;
  color: var(--ink);
}
.site-nav { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.site-nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  font-size: 0.92rem;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a.active {
  background: var(--ink);
  color: #f7f3ea;
}

.hero {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.6rem 1.5rem 1.5rem;
  margin-bottom: 1.15rem;
  animation: rise 0.55s 0.04s ease both;
}
.kicker {
  margin: 0 0 0.45rem;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
}
.hero h1, .page-head h1 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 400;
  letter-spacing: 0.06em;
  line-height: 1.25;
}
.lead {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.75;
  font-size: 0.98rem;
  max-width: 46rem;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.55rem 1rem;
  font: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-accent { background: var(--accent); color: #fff7f2; border-color: transparent; }
.btn-ink { background: var(--ink); color: #f7f3ea; border-color: transparent; }

.section { margin: 1.35rem 0 0; animation: rise 0.6s ease both; }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.8rem;
}
.section h2, .block h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  font-weight: 400;
  letter-spacing: 0.06em;
}
.section-head h2 { margin: 0; }

.grid-3, .grid-2, .cards { display: grid; gap: 0.8rem; }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card, .block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.card { padding: 1.05rem 1.1rem 1.15rem; display: flex; flex-direction: column; gap: 0.55rem; }
.block { padding: 1.15rem 1.25rem 1.25rem; }

.tag {
  align-self: flex-start;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: rgba(179, 58, 43, 0.08);
  border-radius: 999px;
  padding: 0.18rem 0.55rem;
}
.card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 400;
  letter-spacing: 0.05em;
}
.card p, .block p { margin: 0; color: var(--ink-soft); line-height: 1.65; font-size: 0.92rem; }
.card-meta {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}
.card-actions { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: auto; padding-top: 0.35rem; }

.feature-list {
  margin: 0.4rem 0 0;
  padding-left: 1.15rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.7;
}
.feature-list li { margin-bottom: 0.3rem; }
.feature-list strong { color: var(--ink); }

.steps { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.75rem; }
.steps li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.7rem;
  align-items: start;
}
.step-n {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--ink);
  color: #f7f3ea;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.steps h3 { margin: 0 0 0.2rem; font-size: 0.98rem; }
.steps p { margin: 0; }

code, .mono { font-family: var(--font-mono); font-size: 0.86em; }
pre {
  margin: 0.7rem 0 0;
  padding: 0.85rem 0.95rem;
  background: #1a2332;
  color: #f4efe6;
  border-radius: 10px;
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.55;
}

.contact-list { margin: 0; display: grid; gap: 0.55rem; }
.contact-row {
  display: grid;
  grid-template-columns: 5.4rem 1fr;
  gap: 0.6rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed var(--line);
}
.contact-row:last-of-type { border-bottom: 0; padding-bottom: 0; }
.contact-row dt { margin: 0; color: var(--muted); font-size: 0.85rem; }
.contact-row dd { margin: 0; color: var(--ink-soft); }
.contact-row a { color: var(--ink); }
.contact-row a:hover { color: var(--accent); }

.friend-links-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.35rem;
}
.friend-links-list a {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.88rem;
}
.friend-links-list a:hover { border-color: var(--accent); color: var(--accent); }

.notice {
  margin: 0 0 0.9rem;
  padding: 0.75rem 0.9rem;
  border-left: 3px solid var(--accent);
  background: rgba(179, 58, 43, 0.06);
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.6;
}

.crumb {
  margin: 0 0 0.55rem;
  color: var(--muted);
  font-size: 0.82rem;
}
.crumb a { color: var(--ink-soft); }
.crumb a:hover { color: var(--accent); }

.page-head { margin-bottom: 1rem; }

table.data { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
table.data th, table.data td {
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
table.data th { background: #f3eee4; color: var(--ink-soft); }
.table-wrap { overflow: auto; border: 1px solid var(--line); border-radius: 12px; background: #fff; }

.footer {
  margin-top: 1.8rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.8rem;
  text-align: center;
  line-height: 1.6;
}
.footer p { margin: 0 0 0.35rem; }
.footer a { color: var(--ink-soft); }
.footer a:hover { color: var(--accent); }
.footer-brand {
  font-family: var(--font-display);
  font-size: 0.98rem;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35rem 0.85rem;
  margin: 0.55rem 0 0.7rem !important;
}
.muted { color: var(--muted); }
.ok { color: var(--ok); }

@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 860px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .topbar { flex-direction: column; align-items: flex-start; }
  .nav-burger { display: inline-flex; position: absolute; top: 1.25rem; right: 1rem; }
  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 0.4rem;
  }
  .nav-toggle:checked ~ .site-nav { display: flex; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .contact-row { grid-template-columns: 1fr; gap: 0.15rem; }
}