/* ============================================================
   丫丫日程 · 官网样式
   VI：主色 #005A53 · 强调 #B81F24 · 文字 #34485E · 导航 #3D3D3D
   ============================================================ */
:root {
  --primary: #005A53;
  --primary-dark: #00443F;
  --accent: #B81F24;
  --nav: #3D3D3D;
  --text: #34485E;
  --muted: #6B7A8D;
  --line: #E4EAE9;
  --bg-soft: #F4F8F7;
  --radius: 14px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { display: block; }
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-in { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav-brand { display: flex; align-items: center; gap: 10px; }
.nav-brand img { border-radius: 8px; }
.nav-name { font-size: 18px; font-weight: 700; color: var(--primary); }
.nav-en { font-size: 12px; color: var(--muted); letter-spacing: .06em; margin-left: 2px; }
.nav-links { display: flex; align-items: center; gap: 28px; font-size: 15px; }
.nav-links a:not(.nav-cta) { color: var(--text); }
.nav-links a:not(.nav-cta):hover { color: var(--primary); }
.nav-cta {
  background: var(--primary); color: #fff;
  padding: 8px 18px; border-radius: 999px; font-size: 14px;
  transition: background .2s;
}
.nav-cta:hover { background: var(--primary-dark); }
.nav-burger { display: none; background: none; border: none; color: var(--primary); cursor: pointer; padding: 6px; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(160deg, #F4F8F7 0%, #EAF3F1 55%, #DFEEEB 100%);
  overflow: hidden;
}
.hero-in {
  display: flex; align-items: center; gap: 48px;
  padding-top: 76px; padding-bottom: 76px;
}
.hero-text { flex: 1 1 55%; }
.hero-kicker {
  display: inline-block;
  color: var(--primary); font-size: 14px; font-weight: 600; letter-spacing: .12em;
  background: #fff; border: 1px solid var(--line);
  border-radius: 999px; padding: 6px 16px; margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.25; font-weight: 800; letter-spacing: .01em;
  margin-bottom: 18px;
}
.hero-sub { font-size: 17px; color: var(--muted); max-width: 34em; margin-bottom: 30px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 26px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px;
  font-size: 16px; font-weight: 600; transition: all .2s;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 18px rgba(0,90,83,.25); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-ghost { background: #fff; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-ghost:hover { background: #EAF3F1; }
.hero-points { display: flex; gap: 22px; flex-wrap: wrap; list-style: none; }
.hero-points li { display: flex; align-items: center; gap: 7px; font-size: 14px; color: var(--muted); }
.hero-points svg { color: var(--primary); }
.hero-art { flex: 0 0 auto; }
.hero-art img { width: clamp(220px, 26vw, 330px); height: auto; }

/* ---------- 数据带 ---------- */
.strip { background: var(--primary); color: #fff; }
.strip-in { display: flex; justify-content: space-around; flex-wrap: wrap; gap: 18px; padding-top: 26px; padding-bottom: 26px; }
.strip-item { text-align: center; }
.strip-item b { display: block; font-size: 26px; font-weight: 800; }
.strip-item span { font-size: 13px; opacity: .85; }

/* ---------- 通用 Section ---------- */
.sec { padding: 84px 0; }
.sec-alt { background: var(--bg-soft); }
.sec-kicker {
  color: var(--primary); font-size: 14px; font-weight: 700;
  letter-spacing: .14em; margin-bottom: 10px;
}
.sec-title { font-size: clamp(26px, 3.4vw, 36px); font-weight: 800; margin-bottom: 12px; }
.sec-sub { color: var(--muted); font-size: 16px; margin-bottom: 44px; max-width: 40em; }

/* ---------- 能力卡片 ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 26px;
  transition: box-shadow .25s, transform .25s;
}
.card:hover { box-shadow: 0 14px 34px rgba(0,90,83,.10); transform: translateY(-3px); }
.card-ico {
  width: 54px; height: 54px; border-radius: 14px;
  background: #EAF3F1; color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { font-size: 14.5px; color: var(--muted); }

/* ---------- 流程 ---------- */
.flow { display: flex; align-items: stretch; gap: 14px; margin-top: 10px; }
.flow-step {
  flex: 1; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 24px; text-align: center;
}
.flow-num {
  width: 44px; height: 44px; margin: 0 auto 14px;
  border-radius: 50%; background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 800;
}
.flow-step h3 { font-size: 18px; margin-bottom: 8px; }
.flow-step p { font-size: 14.5px; color: var(--muted); }
.flow-arrow { display: flex; align-items: center; color: var(--primary); }

/* ---------- 下载区 ---------- */
.dl { background: linear-gradient(150deg, var(--primary) 0%, var(--primary-dark) 100%); color: #fff; padding: 84px 0; }
.dl-in { text-align: center; position: relative; }
.dl-cat { margin: 0 auto 8px; opacity: .9; }
.dl h2 { font-size: clamp(26px, 3.4vw, 36px); font-weight: 800; }
.dl-sub { opacity: .85; margin: 12px 0 40px; }
.dl-cards { display: flex; justify-content: center; gap: 22px; flex-wrap: wrap; }
.dl-card {
  background: rgba(255,255,255,.10); border: 1px solid rgba(255,255,255,.28);
  border-radius: var(--radius); padding: 28px 34px; width: 250px;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  transition: background .2s, transform .2s;
}
.dl-card:hover { background: rgba(255,255,255,.18); transform: translateY(-3px); }
.dl-card b { font-size: 17px; }
.dl-card span { font-size: 13px; opacity: .8; }

/* ---------- 联系我们 ---------- */
.contact { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 34px; }
.contact-item {
  display: flex; align-items: flex-start; gap: 13px;
  background: var(--bg-soft); border-radius: var(--radius); padding: 22px 20px;
}
.contact-item svg { color: var(--primary); flex: 0 0 auto; margin-top: 3px; }
.contact-item b { display: block; font-size: 14px; margin-bottom: 3px; }
.contact-item span { font-size: 14.5px; color: var(--muted); word-break: break-all; }

/* ---------- 页脚 ---------- */
.footer { background: var(--nav); color: #F2F2F2; padding: 56px 0 40px; }
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 26px; }
.footer-brand img { border-radius: 8px; }
.footer-brand b { display: block; font-size: 17px; }
.footer-en { font-size: 12px; opacity: .65; letter-spacing: .08em; }
.footer-slogan { display: block; font-size: 13px; opacity: .6; }
.footer-copy { font-size: 14px; opacity: .9; margin-bottom: 10px; }
.footer-notice { font-size: 13px; opacity: .55; line-height: 1.9; max-width: 52em; margin-bottom: 18px; }
.footer-beian { font-size: 13.5px; margin-bottom: 12px; }
.footer-beian a { opacity: .85; border-bottom: 1px solid rgba(242,242,242,.35); padding-bottom: 1px; }
.footer-beian a:hover { opacity: 1; color: #fff; }
.footer-sep { opacity: .4; margin: 0 6px; }
.footer-contact { font-style: normal; font-size: 13.5px; opacity: .75; line-height: 2; margin-bottom: 14px; }
.footer-sign { font-size: 12.5px; opacity: .45; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero-in { flex-direction: column; text-align: center; padding-top: 52px; padding-bottom: 52px; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-cta, .hero-points { justify-content: center; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .contact { grid-template-columns: repeat(2, 1fr); }
  .flow { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); justify-content: center; }
}
@media (max-width: 640px) {
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch; gap: 0;
    border-bottom: 1px solid var(--line); box-shadow: 0 12px 24px rgba(0,0,0,.08);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 14px 24px; border-top: 1px solid var(--line); }
  .nav-links .nav-cta { border-radius: 0; text-align: center; }
  .nav-burger { display: block; }
  .grid-3, .contact { grid-template-columns: 1fr; }
  .dl-card { width: 100%; max-width: 320px; }
  .sec { padding: 60px 0; }
}