/* ========== 波哥钣金拆单 · 蓝白配色 ========== */
:root {
  --bg: #f4f7fb;            /* 页面底色 */
  --bg-soft: #e9eff8;       /* 次级区块 */
  --card: #ffffff;          /* 卡片 */
  --card-hi: #f0f5ff;       /* 卡片 hover */
  --line: #d9e2ee;          /* 边框 */
  --line-hi: #b7c9dd;
  --ink: #122a45;           /* 主文字 */
  --muted: #5c6f86;         /* 次级文字 */
  --accent: #1d5fd0;        /* 蓝色主调 */
  --accent-hi: #3b82f6;
  --accent-deep: #16439c;
  --glow: rgba(37,99,235,.25);
  --hero-1: #0a1a33;
  --hero-2: #123a72;
  --hero-3: #1a4f9e;
  --radius: 14px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
a { color: inherit; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { height: 60px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; }
.brand-img {
  height: 44px; width: auto; border-radius: 8px;
  box-shadow: 0 4px 14px rgba(18,67,156,.18);
}
.brand-text { font-size: 16px; letter-spacing: .5px; color: var(--ink); }
.brand-text em { font-style: normal; font-size: 10px; color: var(--accent); margin-left: 6px; letter-spacing: 2px; }
nav { display: flex; gap: 26px; }
nav a { color: var(--muted); text-decoration: none; font-size: 14px; transition: color .2s; }
nav a:hover { color: var(--accent); }

/* ---------- HERO ---------- */
.hero {
  position: relative; overflow: hidden; padding: 96px 0 84px;
  background: linear-gradient(160deg, var(--hero-1) 0%, var(--hero-2) 55%, var(--hero-3) 100%);
  color: #fff;
}
.hero-grid-bg {
  position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 40%, transparent 100%);
}
.hero-grid-bg::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 50% at 70% 20%, var(--glow), transparent 70%);
}
.hero-inner { position: relative; }
.eyebrow { margin: 0 0 14px; color: #7cb8ff; font-size: 13px; font-weight: 800; letter-spacing: 2px; display: flex; align-items: center; gap: 10px; }
.eyebrow-line { width: 34px; height: 2px; background: #7cb8ff; display: inline-block; }
h1 { margin: 0 0 14px; font-size: 52px; line-height: 1.18; letter-spacing: 1px; font-weight: 900; }
.hl {
  color: #8ec5ff;
  text-shadow: 0 0 30px rgba(142,197,255,.45);
}
.lead { max-width: 640px; color: #c9d9ee; font-size: 16px; margin: 0 0 28px; }
.actions { display: flex; gap: 14px; align-items: center; margin-bottom: 20px; }
.button {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 26px; border-radius: 10px;
  text-decoration: none; font-weight: 800; font-size: 15px;
  transition: transform .15s, box-shadow .2s, background .2s;
}
.button:hover { transform: translateY(-2px); }
.primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent-hi), var(--accent-deep));
  box-shadow: 0 8px 26px var(--glow);
}
.primary:hover { box-shadow: 0 12px 34px var(--glow); }
.ghost { color: #fff; border: 1px solid rgba(255,255,255,.35); background: rgba(255,255,255,.06); }
.ghost:hover { border-color: #fff; color: #fff; background: rgba(255,255,255,.12); }
.version { color: #b9cbe2; font-size: 13px; margin: 0 0 22px; }
.version #verText { color: #8ec5ff; font-weight: 700; }
.hero-badges { display: flex; gap: 10px; flex-wrap: wrap; }
.badge {
  font-size: 12px; color: #d7e3f2;
  border: 1px solid rgba(255,255,255,.25); border-radius: 20px;
  padding: 4px 14px; background: rgba(255,255,255,.05);
}
.badge::before { content: "✓ "; color: #7cb8ff; font-weight: 800; }

/* ---------- 通用区块 ---------- */
.section { padding: 74px 0; }
.section-heading { margin-bottom: 34px; }
.section-heading h2 { margin: 0 0 8px; font-size: 30px; font-weight: 900; letter-spacing: .5px; color: var(--ink); }
.sub { color: var(--muted); font-size: 14px; margin: 0; }
h3 { margin: 10px 0 8px; font-size: 17px; font-weight: 800; color: var(--ink); }

/* ---------- 功能卡片 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: 0 1px 3px rgba(18,42,69,.05);
  transition: transform .18s, border-color .2s, box-shadow .2s, background .2s;
}
.card:hover {
  transform: translateY(-4px);
  background: var(--card-hi);
  border-color: var(--accent);
  box-shadow: 0 14px 30px rgba(18,42,69,.10), 0 0 0 1px rgba(37,99,235,.12);
}
.card-icon {
  width: 46px; height: 46px; display: inline-flex; align-items: center; justify-content: center;
  font-size: 22px; color: var(--accent);
  border: 1px solid #c3d5ef; border-radius: 12px;
  background: linear-gradient(135deg, rgba(37,99,235,.10), rgba(37,99,235,.02));
  margin-bottom: 6px;
}
.card p { color: var(--muted); font-size: 13.5px; margin: 0; }

/* ---------- 使用流程 ---------- */
.steps-band { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-bottom: 36px; }
.step { position: relative; padding: 26px 24px; }
.step:not(:last-child)::after {
  content: ""; position: absolute; top: 40px; right: -9px;
  width: 18px; height: 18px; border-top: 2px solid var(--accent); border-right: 2px solid var(--accent);
  transform: rotate(45deg);
}
.step-num {
  font-size: 13px; font-weight: 900; letter-spacing: 2px; color: var(--accent);
  border: 1px solid #c3d5ef; border-radius: 8px; padding: 3px 10px;
  background: rgba(37,99,235,.08);
}
.step p { color: var(--muted); font-size: 13.5px; margin: 0; }
.steps-cta { text-align: center; }

/* ---------- 版本动态 ---------- */
.changelog-card { margin-bottom: 18px; padding: 30px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 1px 3px rgba(18,42,69,.05); }
.cl-head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.cl-ver {
  font-size: 20px; font-weight: 900; color: #fff;
  background: linear-gradient(135deg, var(--accent-hi), var(--accent-deep));
  padding: 4px 16px; border-radius: 8px;
  box-shadow: 0 4px 16px var(--glow);
}
.cl-date { color: var(--muted); font-size: 13px; }
.cl-note { color: var(--ink); font-size: 14px; margin: 0; }
.cl-arch { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.cl-item { display: flex; gap: 16px; align-items: baseline; padding: 16px 20px; background: #fff; border: 1px solid var(--line); border-radius: 10px; }
.cl-v { color: var(--accent); font-weight: 800; white-space: nowrap; font-size: 14px; }
.cl-item p { color: var(--muted); font-size: 13px; margin: 0; }

/* ---------- 联系 ---------- */
.contact-band { border-top: 1px solid var(--line); background: var(--bg); }
.contact-inner { display: flex; justify-content: space-between; align-items: center; gap: 30px; flex-wrap: wrap; }
.contact-info { display: flex; gap: 14px; flex-wrap: wrap; }
.contact-item {
  min-width: 150px; padding: 16px 20px; background: #fff;
  border: 1px solid var(--line); border-radius: 12px;
  display: flex; flex-direction: column; gap: 2px;
  box-shadow: 0 1px 3px rgba(18,42,69,.05);
}
.ci-label { color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: 1px; }
.contact-item span:last-child { font-size: 15px; font-weight: 700; color: var(--ink); }

/* ---------- 页脚 ---------- */
footer { padding: 22px 0; color: #c9d9ee; background: linear-gradient(160deg, var(--hero-1), var(--hero-2)); font-size: 13px; }
.foot-inner { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.foot-tag { letter-spacing: 1px; color: #8ec5ff; }
.beian-links { display: flex; gap: 14px; flex-wrap: wrap; }
.icp-link { color: #c9d9ee; text-decoration: none; }
.mps-link { display: inline-flex; align-items: center; gap: 4px; }
.mps-link .police-badge { display: inline-block; width: 18px !important; height: 18px !important; max-width: 18px; max-height: 18px; object-fit: contain; flex: 0 0 18px; vertical-align: middle; }
.icp-link:hover { color: #fff; text-decoration: underline; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .step:not(:last-child)::after { display: none; }
  .cl-arch { grid-template-columns: 1fr; }
  h1 { font-size: 40px; }
}
@media (max-width: 560px) {
  .feature-grid { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 56px; }
  h1 { font-size: 32px; }
  nav { gap: 14px; }
  nav a { font-size: 13px; }
  .contact-inner { flex-direction: column; align-items: flex-start; }
}