/* 数隐通 PrivaMask 官网样式 —— 品牌视觉自应用源图标派生
   主色（任务口径·应用内置图标蓝）#2F6FB3 / 图标底色实测众数 #075293 /
   图标绿花实测众数 #0EB490。系统字体栈，不引用任何外部资源。 */
:root {
  --ink: #17293c; --sub: #5b6b7d; --line: #dbe4ee; --bg: #f4f7fa;
  --accent: #2f6fb3; --accent-d: #255c96; --accent-deep: #075293; --navy: #052644;
  --leaf: #0eb490; --leaf-d: #0b9375;
  --hero1: #052644; --hero2: #2f6fb3; --card: #ffffff;
}
* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body {
  color: var(--ink); background: var(--bg); line-height: 1.75; font-size: 16px;
  font-family: "Microsoft YaHei UI", "Segoe UI", system-ui, -apple-system, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部导航 ---------- */
nav {
  position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 20px; height: 60px; }
.brand { font-size: 20px; font-weight: 700; color: var(--ink);
  display: inline-flex; align-items: center; gap: 9px; }
.brand img { height: 30px; width: 30px; border-radius: 7px; display: block; }
.brand .dot { color: var(--leaf); }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 18px; font-size: 14px; }
.nav-links a { color: var(--sub); }
.lang-switch { border-left: 1px solid var(--line); padding-left: 18px; }
.lang-switch b { color: var(--ink); }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--hero1) 0%, var(--accent-deep) 55%, var(--hero2) 100%);
  color: #fff; padding: 68px 0 60px; text-align: center;
}
.hero-logo {
  height: 92px; width: 92px; border-radius: 21px; display: inline-block;
  box-shadow: 0 8px 28px rgba(0,0,0,.28); margin-bottom: 20px;
}
.hero h1 { font-size: 42px; line-height: 1.3; margin-bottom: 14px; }
.hero h1 .key { color: var(--leaf); }
.hero .pitch { font-size: clamp(15px, 1.9vw, 18px); opacity: .95; max-width: 760px; margin: 0 auto; }
.hero .sub { font-size: clamp(14px, 1.8vw, 16px); opacity: .85; margin-top: 6px; }
.platform-pills { display: flex; gap: 10px; margin: 24px 0 28px; flex-wrap: wrap; justify-content: center; }
.pill {
  font-size: 13px; padding: 4px 14px; border-radius: 16px;
  background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.35);
}
.btn-row { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 13px 30px;
  border-radius: 8px; font-size: 16px; font-weight: 600; border: none; cursor: pointer;
}
.btn-primary { background: var(--leaf); color: #03372b; }
.btn-primary:hover { background: var(--leaf-d); color: #fff; text-decoration: none; }
.btn-ghost { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.6); }
.btn-ghost:hover { background: rgba(255,255,255,.12); text-decoration: none; }
.btn svg { flex: none; }

/* 版本卡（Hero 内） */
.ver-card {
  margin: 30px auto 0; max-width: 640px; text-align: left;
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.35);
  border-radius: 12px; padding: 14px 20px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.ver-badge {
  flex: none; font-size: 13px; font-weight: 700; padding: 4px 14px; border-radius: 16px;
  background: var(--leaf); color: #03372b;
}
.ver-card p { font-size: 14px; opacity: .95; }
.ver-card p small { display: block; opacity: .8; font-size: 12.5px; }

/* ---------- 通用区块 ---------- */
section.block { padding: 60px 0 8px; }
h2.title { font-size: 28px; margin-bottom: 8px; color: var(--accent-deep); }
p.lead { color: var(--sub); max-width: 760px; margin-bottom: 28px; }

/* 功能四块（2×2） */
.feat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.feat {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 24px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.feat:hover {
  transform: translateY(-3px); box-shadow: 0 10px 24px rgba(7,82,147,.10);
  border-color: #bcd2e8;
}
.feat .ico {
  width: 46px; height: 46px; border-radius: 12px; display: flex;
  align-items: center; justify-content: center; margin-bottom: 12px; color: #fff;
}
.feat .ico.c1 { background: var(--accent); }
.feat .ico.c2 { background: var(--leaf); }
.feat .ico.c3 { background: var(--accent-deep); }
.feat .ico.c4 { background: #4b8ec9; }
.feat h3 { font-size: 17px; margin-bottom: 6px; }
.feat p.note { font-size: 14px; color: var(--sub); margin-bottom: 8px; }
ul.flist { list-style: none; padding: 0; margin: 4px 0 0; }
ul.flist li { font-size: 14px; color: var(--sub); margin: 5px 0; padding-left: 20px; position: relative; }
ul.flist li::before { content: "✓"; position: absolute; left: 0; color: var(--leaf); font-weight: 700; }
ul.flist li b { color: var(--ink); }
code { background: #eef2f9; border-radius: 3px; padding: 1px 6px; font-size: 13px; }

/* 双模式演示行 */
.demo {
  margin-top: 10px; background: #f0f5fa; border: 1px solid var(--line); border-radius: 8px;
  padding: 9px 12px; font-size: 13.5px; color: var(--ink);
  font-family: Consolas, "Courier New", monospace; line-height: 1.7; overflow-x: auto;
}
.demo .arrow { color: var(--leaf-d); font-weight: 700; }
.demo .cm { color: var(--sub); font-family: "Microsoft YaHei UI", "Segoe UI", sans-serif; }

/* 支持格式芯片 */
.fmt-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.fmt-chip {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 13px 15px; display: flex; align-items: center; gap: 12px;
  box-shadow: 0 1px 3px rgba(7,82,147,.05);
}
.fmt-chip .f-ico {
  width: 38px; height: 38px; border-radius: 9px; flex: none;
  display: flex; align-items: center; justify-content: center; color: #fff;
}
.fmt-chip b { font-size: 15px; display: block; line-height: 1.3; }
.fmt-chip small { font-size: 12px; color: var(--sub); display: block; line-height: 1.45; }
.f-xls { background: #217346; }
.f-word { background: #2b579a; }
.f-csv { background: #0b9375; }
.table-note { font-size: 13px; color: var(--sub); margin-top: 12px; }

/* 内置 7 类字段芯片 */
.tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 4px 0 14px; }
.tag {
  font-size: 13.5px; padding: 5px 15px; border-radius: 17px;
  background: #fff; border: 1px solid var(--line); color: var(--ink);
}
.tag::before { content: "# "; color: var(--leaf-d); font-weight: 700; }

/* 隐私承诺块 */
.pledge {
  margin: 56px 0 8px; background: linear-gradient(135deg, #eef8f4, #e6f4ef);
  border: 1px solid #bfe3d6; border-left: 4px solid var(--leaf);
  border-radius: 12px; padding: 26px 28px;
}
.pledge h3 { font-size: 18px; margin-bottom: 8px; color: #0b6b57; }
.pledge p { font-size: 14.5px; color: #2c5449; }

/* 页脚 */
footer { border-top: 1px solid var(--line); margin-top: 64px; padding: 30px 0 44px;
  color: var(--sub); font-size: 13.5px; background: #fff; }
footer .cols { display: flex; gap: 40px; flex-wrap: wrap; }
footer h4 { color: var(--accent-deep); font-size: 14px; margin-bottom: 8px; }
footer ul { list-style: none; padding: 0; }
footer li { margin: 4px 0; }
footer .legal { margin-top: 24px; color: #8a949f; }

@media (max-width: 820px) {
  .feat-grid { grid-template-columns: 1fr; }
  .fmt-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 30px; }
  .nav-links a.hide-sm { display: none; }
}