/* ============================================================
   EIA Hub · eiahub.me — 全站样式（暗色科技风）
   设计规范：近黑蓝灰底 + 青蓝 accent + 光场微结构装饰
   ============================================================ */
:root {
  --bg: #0b0f14;
  --bg-soft: #0e141c;
  --panel: #111823;
  --panel-2: #0d1420;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --text: #e9eef4;
  --text-dim: #9aa8b6;
  --text-faint: #61707f;
  --accent: #4cc9f0;
  --accent-2: #8b7cf6;
  --accent-dim: rgba(76, 201, 240, 0.12);
  --grad: linear-gradient(92deg, #4cc9f0, #8b7cf6);
  --radius: 14px;
  --maxw: 1080px;
  --mono: "Cascadia Mono", "JetBrains Mono", Consolas, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 15, 20, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; gap: 28px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; letter-spacing: .5px; color: var(--text); font-size: 17px;
}
.logo-mark {
  width: 26px; height: 26px; border-radius: 7px;
  background:
    repeating-linear-gradient(112deg,
      rgba(11,15,20,.85) 0 2px, transparent 2px 5px),
    var(--grad);
  flex: none;
}
.nav-links { display: flex; gap: 24px; margin-left: auto; align-items: center; }
.nav-links a { color: var(--text-dim); font-size: 14.5px; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a.nav-cta {
  color: #06222e; background: var(--accent);
  padding: 7px 16px; border-radius: 8px; font-weight: 600;
}
.nav-links a.nav-cta:hover { background: var(--accent-2); color: #06222e; }
.menu-btn {
  display: none; margin-left: auto;
  background: none; border: 1px solid var(--line-strong);
  border-radius: 8px; color: var(--text); width: 38px; height: 34px;
  font-size: 16px; cursor: pointer;
}

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    repeating-linear-gradient(112deg,
      rgba(76, 201, 240, 0.045) 0 1px, transparent 1px 26px),
    radial-gradient(620px 340px at 78% -10%, rgba(139, 124, 246, 0.14), transparent 70%),
    radial-gradient(560px 320px at 12% 0%, rgba(76, 201, 240, 0.10), transparent 70%),
    var(--bg);
}
.hero-inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: 96px 24px 88px;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 2px;
  color: var(--accent); text-transform: uppercase;
  border: 1px solid rgba(76, 201, 240, 0.3);
  border-radius: 999px; padding: 5px 14px; margin-bottom: 22px;
  background: rgba(76, 201, 240, 0.06);
}
.hero h1 {
  font-size: clamp(30px, 5.2vw, 52px);
  line-height: 1.22; font-weight: 700; letter-spacing: -.5px;
  max-width: 760px;
}
.hero h1 .grad {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead {
  margin-top: 20px; max-width: 640px;
  color: var(--text-dim); font-size: 17px;
}
.hero-actions { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-tags {
  margin-top: 46px; display: flex; flex-wrap: wrap; gap: 10px;
}
.hero-tags span {
  font-family: var(--mono); font-size: 12px; color: var(--text-faint);
  border: 1px solid var(--line); border-radius: 6px; padding: 4px 10px;
  background: rgba(255, 255, 255, 0.02);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 24px; border-radius: 10px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  border: 1px solid transparent; transition: all .18s;
}
.btn-primary { background: var(--accent); color: #06222e; }
.btn-primary:hover { background: var(--accent-2); color: #06222e; transform: translateY(-1px); }
.btn-ghost { border-color: var(--line-strong); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- 区块 ---------- */
.section { padding: 84px 0; }
.section-head { margin-bottom: 44px; }
.section-head .kicker {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 2px;
  color: var(--accent); text-transform: uppercase; margin-bottom: 10px;
}
.section-head h2 { font-size: clamp(24px, 3.4vw, 34px); font-weight: 700; letter-spacing: -.3px; }
.section-head p { color: var(--text-dim); margin-top: 12px; max-width: 620px; }

/* ---------- 项目卡片 ---------- */
.proj-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px;
}
.proj-card {
  position: relative; display: block;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px 28px 24px;
  transition: border-color .2s, transform .2s, background .2s;
  overflow: hidden;
}
.proj-card:hover {
  border-color: rgba(76, 201, 240, 0.45);
  transform: translateY(-3px);
  background: var(--panel-2);
}
.proj-card .num {
  position: absolute; top: 12px; right: 18px;
  font-family: var(--mono); font-size: 44px; font-weight: 700;
  color: rgba(255, 255, 255, 0.05); line-height: 1;
}
.proj-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
.proj-card .role {
  font-size: 13.5px; color: var(--accent); margin-bottom: 12px;
  font-family: var(--mono); letter-spacing: .3px;
}
.proj-card p { color: var(--text-dim); font-size: 14.5px; min-height: 66px; }
.proj-card .go {
  margin-top: 16px; font-size: 14px; color: var(--accent);
  display: inline-flex; align-items: center; gap: 6px;
}
.proj-card:hover .go { gap: 10px; }
.proj-card .go { transition: gap .2s; }

/* ---------- 详情页 ---------- */
.page-head {
  position: relative; overflow: hidden; border-bottom: 1px solid var(--line);
  background:
    repeating-linear-gradient(112deg,
      rgba(76, 201, 240, 0.035) 0 1px, transparent 1px 26px),
    radial-gradient(520px 300px at 85% -20%, rgba(139, 124, 246, 0.12), transparent 70%),
    var(--bg);
}
.page-head-inner { max-width: var(--maxw); margin: 0 auto; padding: 72px 24px 56px; }
.page-head .kicker {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 2px;
  color: var(--accent); text-transform: uppercase; margin-bottom: 12px;
}
.page-head h1 { font-size: clamp(28px, 4.4vw, 44px); font-weight: 700; letter-spacing: -.4px; }
.page-head p.lead { color: var(--text-dim); margin-top: 14px; max-width: 640px; font-size: 16.5px; }
.page-head .hero-actions { margin-top: 28px; }
.chip-row { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-family: var(--mono); font-size: 12px; color: var(--text-dim);
  border: 1px solid var(--line); border-radius: 6px; padding: 3px 10px;
  background: rgba(255,255,255,.02);
}

/* 截图占位 */
.shot {
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; background: var(--panel-2);
}
.shot-bar {
  display: flex; gap: 6px; padding: 10px 14px;
  border-bottom: 1px solid var(--line); background: var(--panel);
}
.shot-bar i { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,.12); }
.shot-body {
  aspect-ratio: 16 / 9; display: flex; align-items: center; justify-content: center;
  position: relative;
  background:
    repeating-linear-gradient(112deg,
      rgba(76, 201, 240, 0.06) 0 1px, transparent 1px 18px),
    radial-gradient(400px 220px at 70% 30%, rgba(139,124,246,.10), transparent 70%),
    var(--panel-2);
}
.shot-body .ph {
  text-align: center; color: var(--text-faint);
  font-family: var(--mono); font-size: 13px; letter-spacing: 1px;
}
.shot-body .ph b {
  display: block; font-size: 15px; color: var(--text-dim);
  margin-bottom: 6px; letter-spacing: 2px; font-weight: 600;
}

/* 功能亮点 */
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feat {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 20px;
}
.feat h4 { font-size: 15.5px; font-weight: 600; margin-bottom: 8px; display: flex; align-items: center; gap: 10px; }
.feat h4::before {
  content: ""; width: 8px; height: 8px; border-radius: 2px;
  background: var(--grad); flex: none;
}
.feat p { color: var(--text-dim); font-size: 13.5px; line-height: 1.65; }

/* 特性表 */
.spec {
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden;
}
.spec-row {
  display: grid; grid-template-columns: 220px 1fr;
  border-bottom: 1px solid var(--line);
}
.spec-row:last-child { border-bottom: none; }
.spec-row:nth-child(odd) { background: var(--panel); }
.spec-row .k {
  padding: 13px 20px; color: var(--text-faint); font-size: 13.5px;
  font-family: var(--mono);
  border-right: 1px solid var(--line);
}
.spec-row .v { padding: 13px 20px; color: var(--text); font-size: 14px; }

/* CTA */
.cta {
  border: 1px solid rgba(76, 201, 240, 0.3); border-radius: var(--radius);
  background:
    repeating-linear-gradient(112deg, rgba(76,201,240,.05) 0 1px, transparent 1px 24px),
    var(--panel-2);
  padding: 44px 36px; text-align: center;
}
.cta h3 { font-size: 24px; margin-bottom: 10px; }
.cta p { color: var(--text-dim); margin-bottom: 26px; }

/* 占位提示页 */
.holding {
  min-height: 60vh; display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 60px 24px;
}
.holding .box { max-width: 520px; }
.holding h1 { font-size: 30px; margin: 18px 0 12px; }
.holding p { color: var(--text-dim); }

/* ---------- 页脚 ---------- */
footer {
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  margin-top: 40px;
}
.foot-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 44px 24px;
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px;
}
.foot-brand p { color: var(--text-faint); font-size: 13.5px; margin-top: 10px; max-width: 300px; }
.foot-col h5 {
  font-size: 13px; color: var(--text-faint); letter-spacing: 1.5px;
  text-transform: uppercase; margin-bottom: 14px; font-weight: 600;
  font-family: var(--mono);
}
.foot-col a { display: block; color: var(--text-dim); font-size: 14px; padding: 4px 0; }
.foot-col a:hover { color: var(--accent); }
.foot-bottom {
  border-top: 1px solid var(--line);
  text-align: center; padding: 18px 24px;
  color: var(--text-faint); font-size: 12.5px;
}

/* ---------- 进场动画 ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .proj-grid { grid-template-columns: 1fr; }
  .feat-grid { grid-template-columns: 1fr 1fr; }
  .foot-inner { grid-template-columns: 1fr; gap: 24px; }
  .nav-links {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: rgba(11, 15, 20, 0.97); border-bottom: 1px solid var(--line);
    padding: 8px 24px 16px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 0; }
  .nav-links a.nav-cta { margin-top: 8px; text-align: center; }
  .menu-btn { display: block; }
  .spec-row { grid-template-columns: 150px 1fr; }
}
@media (max-width: 560px) {
  .feat-grid { grid-template-columns: 1fr; }
  .hero-inner { padding: 68px 24px 60px; }
  .section { padding: 60px 0; }
}