/* 第2套 www · 工程蓝图 Blueprint */
:root {
  --navy: #0b1f3a;
  --navy-2: #123154;
  --cyan: #7ec8e3;
  --cyan-dim: #3d8aa6;
  --paper: #e8eef4;
  --ink: #d7e6f0;
  --muted: #8aa4b8;
  --line: rgba(126, 200, 227, 0.35);
  --panel: #10263f;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: auto; }

body {
  margin: 0;
  color: var(--ink);
  background-color: var(--navy);
  background-image:
    linear-gradient(rgba(126, 200, 227, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126, 200, 227, 0.07) 1px, transparent 1px);
  background-size: 28px 28px;
  font-family: "Segoe UI", "Bahnschrift", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { color: #b7e6f5; text-decoration: underline; }
svg { display: inline-block; vertical-align: middle; }
.wrap { width: min(1140px, calc(100% - 2rem)); margin: 0 auto; }

.topbar {
  background: #071627;
  border-bottom: 1px solid var(--cyan);
  position: sticky;
  top: 0;
  z-index: 20;
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 1rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
}
.brand svg { width: 26px; height: 26px; color: var(--cyan); }
.nav { display: flex; gap: 0.25rem; }
.nav a {
  padding: 0.45rem 0.85rem;
  border: 1px solid transparent;
  color: var(--ink);
  font-size: 0.92rem;
  text-decoration: none;
}
.nav a:hover { border-color: var(--line); color: var(--cyan); text-decoration: none; }
.nav a.on {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.sheet {
  margin: 1.6rem auto 2.4rem;
  background: var(--panel);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 6px rgba(7, 22, 39, 0.45);
}
.frame-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--line);
  color: var(--cyan);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.pad { padding: 1.4rem 1.5rem 1.7rem; }

.hero-bp {
  display: grid;
  grid-template-columns: 1.35fr 0.75fr;
  gap: 1.3rem;
}
.hero-bp h1 {
  margin: 0 0 0.8rem;
  font-size: clamp(1.55rem, 2.8vw, 2.1rem);
  color: #fff;
  letter-spacing: 0.02em;
}
.title-block {
  border: 1px solid var(--cyan);
  padding: 1rem;
  background: #0d223c;
}
.title-block h3 {
  margin: 0 0 0.5rem;
  color: var(--cyan);
  font-size: 0.86rem;
  letter-spacing: 0.12em;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0.3rem 0.45rem 0.3rem 0;
  padding: 0.65rem 1.05rem;
  background: var(--cyan);
  color: #0b1f3a;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--cyan);
}
.btn svg { width: 16px; height: 16px; }
.btn:hover { background: #b7e6f5; color: #071627; text-decoration: none; }
.btn-ghost {
  background: transparent;
  color: var(--cyan);
}
.btn-ghost:hover { background: rgba(126, 200, 227, 0.12); color: var(--cyan); }

.sec { padding: 1.5rem 0 0.2rem; }
.sec h2 {
  margin: 0 0 0.8rem;
  padding-left: 0.7rem;
  border-left: 4px solid var(--cyan);
  font-size: 1.28rem;
  color: #fff;
}
.no {
  display: inline-block;
  margin-right: 0.4rem;
  color: var(--cyan);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.92rem;
}

.mods {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
}
.mod {
  border: 1px solid var(--line);
  padding: 0.95rem;
  background: #0e2440;
}
.mod h3 { margin: 0 0 0.4rem; color: var(--cyan); font-size: 1rem; }
.mod svg { width: 18px; height: 18px; margin-right: 0.3rem; }

.ports {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.6rem;
}
.port {
  border: 1px dashed var(--cyan-dim);
  padding: 0.8rem 0.7rem;
  text-align: center;
  font-size: 0.9rem;
}
.port strong { display: block; color: #fff; margin-bottom: 0.3rem; }

.evals { display: grid; gap: 0.7rem; }
.eval {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 0.8rem;
  border: 1px solid var(--line);
  padding: 0.85rem;
}
.eval b { color: var(--cyan); font-size: 0.86rem; }

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
}
.metric {
  background: #071627;
  border: 1px solid var(--cyan-dim);
  padding: 0.85rem;
  text-align: center;
}
.metric b { display: block; font-size: 1.4rem; color: var(--cyan); font-family: Consolas, monospace; }

.grid {
  width: 100%;
  border-collapse: collapse;
}
.grid th, .grid td {
  border: 1px solid var(--line);
  padding: 0.5rem 0.65rem;
  text-align: left;
}
.grid th { background: #071627; color: var(--cyan); }

.qas article {
  border-bottom: 1px solid var(--line);
  padding: 0.85rem 0;
}
.qas h3 { margin: 0 0 0.35rem; color: #fff; font-size: 1rem; }

.site-foot {
  border-top: 1px solid var(--cyan);
  padding: 1.3rem 0 2rem;
  color: var(--muted);
  font-size: 0.9rem;
  background: #071627;
}
.site-foot .safe { color: #8fe3b0; font-weight: 700; }
.foot-nav a { margin-right: 1rem; }

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  padding: 0.3rem 0.45rem;
  cursor: pointer;
}
.nav-toggle svg { width: 18px; height: 18px; }

@media (max-width: 900px) {
  .hero-bp, .mods, .ports, .metrics, .eval { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-flex; }
  .nav { display: none; flex-direction: column; width: 100%; }
  .nav.open { display: flex; }
  .topbar-inner { flex-wrap: wrap; padding: 0.6rem 0; }
}

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }