/* ===========================================================
   wobadi-website — 简约专业初稿
   零依赖纯静态。设计令牌集中在 :root。
   =========================================================== */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --ink: #15171c;
  --ink-soft: #5b6271;
  --line: #e6e8ec;
  --brand: #2a52ff;
  --brand-ink: #1f3fd6;
  --accent: #ff7a45;

  --maxw: 1080px;
  --radius: 14px;
  --gap: clamp(1rem, 2.5vw, 1.5rem);

  --font: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont,
    "Segoe UI", "Helvetica Neue", Arial, "Noto Sans CJK SC", sans-serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-ink); }

h1, h2, h3 { line-height: 1.25; letter-spacing: -0.01em; margin: 0; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

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

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 64px; flex-wrap: wrap;
}
.brand { display: inline-flex; align-items: baseline; font-weight: 800; color: var(--ink); }
.brand:hover { color: var(--ink); }
.brand .logo { font-size: 1.4rem; letter-spacing: 0.04em; line-height: 1; }
.brand .logo-wo { color: var(--ink); }
.brand .logo-badi { color: var(--brand); }

.menu { display: flex; align-items: center; gap: clamp(0.6rem, 2vw, 1.6rem); list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
.menu a {
  color: var(--ink); font-weight: 500; font-size: 0.96rem;
  padding: 6px 2px; position: relative; white-space: nowrap;
}
.menu a:hover { color: var(--brand); }
.menu a[aria-current="page"] { color: var(--brand); }
.menu a[aria-current="page"]::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--brand); border-radius: 2px;
}
.menu .ext::after { content: " ↗"; font-size: 0.78em; color: var(--ink-soft); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.25rem; border-radius: 999px; font-weight: 600; font-size: 0.96rem;
  border: 1px solid transparent; cursor: pointer; transition: transform .12s ease, background .18s ease, border-color .18s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-ink); color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink-soft); color: var(--ink); }

/* ---------- Sections ---------- */
section { padding: clamp(3.5rem, 8vw, 6rem) 0; }
.section-soft { background: var(--bg-soft); }
.eyebrow { font-size: 0.82rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--brand); margin-bottom: 0.9rem; }
.section-head { max-width: 640px; margin-bottom: 2.5rem; }
.section-head h2 { font-size: clamp(1.6rem, 4vw, 2.2rem); }
.section-head p { color: var(--ink-soft); margin: 0.8rem 0 0; }

/* ---------- Hero ---------- */
.hero { padding: clamp(4rem, 11vw, 8rem) 0 clamp(3rem, 7vw, 5rem); }
.hero .eyebrow { margin-bottom: 1.2rem; }
.hero h1 { font-size: clamp(2.4rem, 7vw, 4.2rem); font-weight: 800; letter-spacing: -0.02em; }
.hero .sub { font-size: clamp(1.2rem, 3vw, 1.7rem); font-weight: 600; color: var(--ink); margin-top: 0.6rem; }
.hero .lead { font-size: 1.1rem; color: var(--ink-soft); max-width: 620px; margin: 1.4rem 0 2rem; }
.hero-actions { display: flex; gap: 0.8rem; flex-wrap: wrap; }

/* ---------- Cards grid ---------- */
.grid { display: grid; gap: var(--gap); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.5rem; transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}
.card:hover { border-color: #d4d8df; box-shadow: 0 10px 30px -18px rgba(20, 25, 40, 0.35); transform: translateY(-2px); }
.card h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }
.card .kicker { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--brand); }
.card p { color: var(--ink-soft); margin: 0.5rem 0 0; font-size: 0.97rem; }
.card .more { display: inline-block; margin-top: 1rem; font-weight: 600; font-size: 0.92rem; }

/* ---------- Chips / tags ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.1rem; padding: 0; list-style: none; }
.chips li {
  font-size: 0.85rem; color: var(--ink-soft); background: var(--bg-soft);
  border: 1px solid var(--line); border-radius: 999px; padding: 0.3rem 0.8rem;
}

/* ---------- Project block ---------- */
.project { border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(1.5rem, 4vw, 2.5rem); background: var(--bg); }
.project + .project { margin-top: var(--gap); }
.project .kicker { font-size: 0.82rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }
.project h3 { font-size: clamp(1.3rem, 3vw, 1.7rem); margin-top: 0.4rem; }
.project p { color: var(--ink-soft); max-width: 720px; }

/* ---------- Prose (About) ---------- */
.prose { max-width: 720px; }
.prose h2 { font-size: 1.5rem; margin: 2.6rem 0 0.7rem; }
.prose h2:first-child { margin-top: 0; }
.prose p { margin: 0.6rem 0; color: #2a2e38; }
.prose strong { color: var(--ink); }
.prose .ccc { display: grid; gap: var(--gap); grid-template-columns: repeat(3, 1fr); margin-top: 1.2rem; }
.prose .ccc .card p { margin-top: 0.4rem; }

/* ---------- CTA band ---------- */
.cta-band { background: var(--ink); color: #fff; border-radius: var(--radius); padding: clamp(2rem, 6vw, 3.5rem); text-align: center; }
.cta-band h2 { font-size: clamp(1.5rem, 4vw, 2rem); }
.cta-band p { color: #b9c0d0; margin: 0.7rem 0 1.6rem; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-soft); padding: 3rem 0; margin-top: 1rem; }
.footer-grid { display: flex; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.footer-brand .slogan { color: var(--ink-soft); margin-top: 0.5rem; font-size: 0.95rem; max-width: 380px; }
.footer-links { display: flex; gap: 2.5rem; flex-wrap: wrap; }
.footer-links h4 { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-soft); margin: 0 0 0.8rem; }
.footer-links ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem; }
.footer-links a { color: var(--ink); font-size: 0.95rem; }
.footer-links a:hover { color: var(--brand); }
.footer-bottom { margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 0.85rem; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .prose .ccc { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .menu { gap: 0.5rem 1rem; }
  .nav { min-height: 56px; }
}