/* ===== 永生实验室 · lab.yuanzhouyi.com ===== */
:root {
  --bg: #0a0e14;
  --card: #131920;
  --card-hover: #1a2330;
  --border: #2d3540;
  --text: #e0e6ed;
  --text2: #8892a0;
  --accent: #48c774;
  --accent-dim: rgba(72,199,116,0.15);
  --red: #f85149;
  --orange: #d29922;
  --blue: #58a6ff;
}
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height:1.6;
  min-height:100vh;
}
.container { max-width:960px; margin:0 auto; padding:0 24px; }

/* ===== Header / Nav ===== */
nav {
  display:flex; align-items:center; justify-content:space-between;
  padding:16px 24px; border-bottom:1px solid var(--border);
  position:sticky; top:0; background:rgba(10,14,20,0.92); backdrop-filter:blur(8px);
  z-index:100;
}
nav .logo { font-weight:700; font-size:1.1rem; letter-spacing:2px; }
nav .logo span { color:var(--accent); }
nav .nav-links { display:flex; gap:20px; align-items:center; }
nav .nav-links a {
  color:var(--text2); text-decoration:none; font-size:0.82rem;
  transition:color 0.2s; padding:4px 0;
}
nav .nav-links a:hover { color:var(--accent); }

/* ===== Hero ===== */
.hero {
  text-align:center;
  padding:60px 0 40px;
  background: radial-gradient(ellipse at 50% 0%, rgba(72,199,116,0.06) 0%, transparent 65%);
}
.hero h1 { font-size:2rem; font-weight:700; letter-spacing:4px; }
.hero h1 span { color:var(--accent); }
.hero .tagline { font-size:0.85rem; color:var(--text2); margin-top:6px; letter-spacing:1px; }
.hero .desc {
  max-width:600px; margin:20px auto 0;
  font-size:0.92rem; color:var(--text2); line-height:1.8;
}
.hero .desc em { color:var(--accent); font-style:normal; }

/* ===== Status Bar ===== */
.status-bar {
  display:flex; justify-content:center; gap:24px; flex-wrap:wrap;
  margin:24px auto 0; max-width:600px;
}
.status-item { text-align:center; }
.status-item .val {
  font-size:1.4rem; font-weight:700; color:var(--accent);
}
.status-item .lbl { font-size:0.72rem; color:var(--text2); margin-top:2px; }
.status-item .dot {
  display:inline-block; width:8px; height:8px; border-radius:50%;
  background:var(--green); margin-right:4px; animation:pulse-dot 2s infinite;
}
@keyframes pulse-dot { 0%,100%{opacity:1} 50%{opacity:0.4} }

/* ===== CTA Row ===== */
.cta-row {
  display:flex; gap:12px; justify-content:center; flex-wrap:wrap;
  margin-top:32px;
}
.btn {
  display:inline-flex; align-items:center; gap:6px;
  padding:11px 26px; border-radius:8px;
  font-size:0.88rem; font-weight:500; text-decoration:none;
  transition:all 0.2s; border:none; cursor:pointer;
}
.btn:active { transform:scale(0.97); }
.btn-primary { background:var(--accent); color:#000; }
.btn-primary:hover { opacity:0.85; }
.btn-secondary { background:transparent; border:1px solid var(--border); color:var(--text); }
.btn-secondary:hover { border-color:var(--accent); color:var(--accent); }
.btn-sm { padding:7px 16px; font-size:0.8rem; }

/* ===== Section ===== */
.section { padding:40px 0; }
.section + .section { border-top:1px solid var(--border); }
.section h2 {
  font-size:1.15rem; font-weight:600; margin-bottom:6px;
  display:flex; align-items:center; gap:8px;
}
.section .sub { font-size:0.82rem; color:var(--text2); margin-bottom:20px; }

/* ===== Cards ===== */
.card-grid {
  display:grid; grid-template-columns:repeat(auto-fill, minmax(280px, 1fr)); gap:14px;
}
.card {
  background:var(--card); border:1px solid var(--border);
  border-radius:10px; padding:20px; transition:all 0.2s;
}
.card:hover { border-color:var(--accent); background:var(--card-hover); }
.card h3 { font-size:0.92rem; font-weight:600; margin-bottom:4px; display:flex; align-items:center; gap:6px; }
.card p { font-size:0.82rem; color:var(--text2); line-height:1.6; }
.card .meta { font-size:0.72rem; color:var(--text2); margin-top:8px; padding-top:8px; border-top:1px solid var(--border); }

/* ===== Steps ===== */
.steps { display:flex; gap:12px; flex-wrap:wrap; }
.step {
  flex:1; min-width:180px;
  background:var(--card); border:1px solid var(--border);
  border-radius:10px; padding:18px; text-align:center;
}
.step .num {
  display:inline-flex; width:32px; height:32px; border-radius:50%;
  background:var(--accent-dim); color:var(--accent);
  align-items:center; justify-content:center;
  font-size:0.85rem; font-weight:700; margin-bottom:8px;
}
.step h4 { font-size:0.85rem; font-weight:500; }
.step p { font-size:0.75rem; color:var(--text2); margin-top:4px; }

/* ===== Roadmap Timeline ===== */
.timeline { position:relative; padding-left:28px; }
.timeline::before {
  content:''; position:absolute; left:8px; top:0; bottom:0;
  width:2px; background:var(--border);
}
.timeline-item { position:relative; padding:0 0 24px 12px; }
.timeline-item::before {
  content:''; position:absolute; left:-24px; top:6px;
  width:12px; height:12px; border-radius:50%;
  background:var(--card); border:2px solid var(--accent);
}
.timeline-item.completed::before { background:var(--accent); }
.timeline-item h4 { font-size:0.9rem; font-weight:500; }
.timeline-item p { font-size:0.8rem; color:var(--text2); margin-top:2px; }
.timeline-item .status-tag {
  display:inline-block; font-size:0.65rem; padding:1px 8px;
  border-radius:10px; margin-top:4px;
}
.tag-done { background:var(--accent-dim); color:var(--accent); }
.tag-progress { background:rgba(88,166,255,0.15); color:var(--blue); }
.tag-future { background:rgba(45,53,64,0.5); color:var(--text2); }

/* ===== Footer ===== */
footer {
  text-align:center; padding:32px 0;
  border-top:1px solid var(--border); margin-top:48px;
  font-size:0.78rem; color:var(--text2);
}
footer a { color:var(--text2); text-decoration:none; }
footer a:hover { color:var(--accent); }
footer .beian { margin-top:6px; font-size:0.7rem; }

/* ===== Responsive ===== */
@media (max-width:600px) {
  nav .nav-links { gap:10px; }
  nav .nav-links a { font-size:0.75rem; }
  .hero h1 { font-size:1.5rem; }
  .status-bar { gap:14px; }
  .status-item .val { font-size:1.1rem; }
}