/* 深色科技感单页 — 无外链字体、无构建依赖，纯静态可维护 */
:root {
  --bg0: #05080d;
  --bg1: #0a1018;
  --surface: rgba(15, 23, 36, 0.65);
  --surface2: rgba(20, 32, 48, 0.55);
  --text: #e8eef5;
  --muted: #8b9cb3;
  --line: rgba(94, 234, 212, 0.12);
  --accent: #2dd4bf;
  --accent-dim: #14b8a6;
  --glow: rgba(45, 212, 191, 0.35);
  --r: 14px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.page {
  margin: 0;
  min-height: 100vh;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", ui-sans-serif, system-ui, sans-serif;
  background: var(--bg0);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

/* 背景：深空 + 细网格 + 顶部青光 */
.page-bg {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 100% 80% at 50% -30%, rgba(45, 212, 191, 0.14), transparent 55%),
    radial-gradient(ellipse 60% 50% at 100% 0%, rgba(56, 189, 248, 0.08), transparent 45%),
    linear-gradient(180deg, var(--bg1) 0%, var(--bg0) 40%, #030508 100%);
}

.page-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(94, 234, 212, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(94, 234, 212, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 20%, transparent 70%);
}

/* 顶栏 */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 8, 13, 0.75);
  backdrop-filter: blur(14px);
}

.topbar-inner {
  position: relative;
  z-index: 1;
  max-width: 72rem;
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  background: linear-gradient(105deg, #f0fdfa 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand span {
  font-weight: 500;
  opacity: 0.75;
  color: var(--muted);
  -webkit-text-fill-color: var(--muted);
}

a.cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: linear-gradient(135deg, var(--accent-dim), #0d9488);
  color: #042f2e !important;
  text-decoration: none;
  padding: 0.5rem 1.15rem;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 700;
  box-shadow: 0 0 24px var(--glow);
  transition: transform 0.15s, box-shadow 0.15s;
}

a.cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 32px rgba(45, 212, 191, 0.45);
}

/* Hero */
.hero {
  position: relative;
  z-index: 1;
  max-width: 72rem;
  margin: 0 auto;
  padding: 3rem 1.25rem 2.5rem;
  text-align: center;
}

.badge {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 1rem;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface2);
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 5vw, 2.6rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, #fff 0%, #99f6e4 45%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  margin: 0 auto;
  max-width: 40rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 2rem;
}

.stat {
  padding: 0.65rem 1.1rem;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: var(--surface);
  backdrop-filter: blur(8px);
  font-size: 0.82rem;
}

.stat strong {
  display: block;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.stat span {
  color: var(--muted);
  font-size: 0.78rem;
}

.hero-line {
  margin: 2.25rem auto 0;
  height: 1px;
  max-width: 16rem;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.5;
}

/* 区块 */
.section {
  position: relative;
  z-index: 1;
  max-width: 72rem;
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

.h2 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1.25rem;
  padding-left: 0.75rem;
  border-left: 3px solid var(--accent);
}

.prose {
  border-radius: var(--r);
  padding: 1.5rem 1.6rem;
  border: 1px solid var(--line);
  background: var(--surface);
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.35);
}

.prose p {
  margin: 0 0 1rem;
  color: #c5d0de;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose strong {
  color: #eef4fa;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.1rem;
}

.card {
  border-radius: var(--r);
  padding: 1.4rem 1.45rem;
  border: 1px solid var(--line);
  background: linear-gradient(155deg, var(--surface) 0%, rgba(10, 18, 28, 0.9) 100%);
  backdrop-filter: blur(10px);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  border-color: rgba(45, 212, 191, 0.35);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(45, 212, 191, 0.08);
  transform: translateY(-3px);
}

.card h3 {
  margin: 0 0 0.45rem;
  font-size: 1.08rem;
  color: #f0fdf9;
}

.entity {
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
  font-family: ui-monospace, monospace;
  opacity: 0.95;
}

.card p:last-child {
  margin: 0;
  font-size: 0.92rem;
  color: #a8b8cc;
}

.checks {
  list-style: none;
  padding: 0;
  margin: 0;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: var(--surface);
  overflow: hidden;
}

.checks li {
  padding: 0.85rem 1rem 0.85rem 2.5rem;
  position: relative;
  border-bottom: 1px solid var(--line);
  color: #c5d0de;
  font-size: 0.95rem;
}

.checks li:last-child {
  border-bottom: none;
}

.checks li::before {
  content: "▸";
  position: absolute;
  left: 1rem;
  color: var(--accent);
  font-weight: 700;
}

.contact-block {
  border-radius: var(--r);
  padding: 1.75rem 1.5rem;
  border: 1px solid var(--line);
  background: linear-gradient(165deg, rgba(15, 28, 40, 0.85) 0%, rgba(5, 10, 16, 0.95) 100%);
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.45);
}

.contact-block .h2 {
  border-left-color: #38bdf8;
}

.dl {
  display: grid;
  gap: 0.85rem;
  margin: 0;
}

.dl dt {
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.dl dd {
  margin: 0;
  font-size: 0.92rem;
  color: #d1dae6;
}

.dl a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.dl a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer {
  position: relative;
  z-index: 1;
  max-width: 72rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 2.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.footer .meta {
  margin-top: 0.85rem;
  opacity: 0.75;
}

@media (max-width: 520px) {
  .topbar-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-stats {
    flex-direction: column;
    align-items: stretch;
  }
}