:root {
  --red: #e60012;
  --red-d: #b4000e;
  --bg: #f6f7f9;
  --card: #ffffff;
  --ink: #1a1a1a;
  --sub: #5c6570;
  --line: #e2e6ea;
  --blue: #1f4e79;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

a { color: var(--red); text-decoration: none; }
a:hover { text-decoration: underline; }

.bar {
  background: var(--red);
  color: #fff;
  text-align: center;
  padding: 18px 16px 10px;
}

.bar .brand {
  font-size: 30px;
  font-weight: 800;
  letter-spacing: 0.2em;
}

.bar .tag {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.16em;
  opacity: 0.9;
}

nav.pills {
  background: var(--red-d);
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 10px 12px 14px;
  flex-wrap: wrap;
}

nav.pills a {
  color: #fff;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: 999px;
  padding: 6px 18px;
  font-size: 14px;
}

nav.pills a.current {
  background: #fff;
  color: var(--red);
  border-color: #fff;
}

nav.pills a:hover { text-decoration: none; opacity: 0.92; }

.hero {
  width: min(1080px, calc(100% - 32px));
  margin: 28px auto 20px;
  background: linear-gradient(180deg, #fff, #fff5f5);
  border: 1px solid #f0d0d2;
  border-radius: 12px;
  text-align: center;
  padding: 36px 24px 32px;
}

.hero h1 {
  font-size: 30px;
  line-height: 1.45;
  margin-bottom: 14px;
}

.hero .lead { color: var(--sub); max-width: 760px; margin: 0 auto 18px; }

.feat-mini {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  max-width: 720px;
  margin: 0 auto 22px;
}

.feat-mini b {
  display: block;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 6px;
  font-size: 14px;
  color: var(--blue);
}

.btn {
  display: inline-block;
  background: var(--red);
  color: #fff;
  border-radius: 6px;
  padding: 13px 28px;
  font-weight: 700;
  font-size: 17px;
}

.btn:hover { background: var(--red-d); text-decoration: none; }

.btn-line {
  display: inline-block;
  margin-left: 8px;
  border: 1px solid var(--red);
  color: var(--red);
  border-radius: 6px;
  padding: 12px 18px;
}

.grid3 {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto 28px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px 18px 16px;
}

.card h2 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--blue);
  border-left: 4px solid var(--red);
  padding-left: 10px;
}

.stack {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 24px 22px;
}

.stack h2 {
  font-size: 20px;
  margin-bottom: 12px;
  color: #222;
}

table.func {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

table.func th, table.func td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
}

table.func th { background: #fff1f1; color: var(--red-d); }

.faq { width: min(1080px, calc(100% - 32px)); margin: 0 auto 32px; }
.faq h2 { margin-bottom: 12px; }
.faq details { display: none; }
.q {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 10px;
}
.q strong { display: block; margin-bottom: 6px; }

footer.site {
  background: #2b2b2b;
  color: #c8c8c8;
  padding: 28px 16px 36px;
  font-size: 13px;
  text-align: center;
  line-height: 1.8;
}

footer.site a { color: #ffd0d0; }
footer.site .safe { color: #ffe08a; }

@media (max-width: 900px) {
  .feat-mini, .grid3 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  .feat-mini, .grid3 { grid-template-columns: 1fr; }
  .hero h1 { font-size: 22px; }
  .btn-line { margin: 10px 0 0; }
}