:root {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-hover: #222634;
  --text: #e8e8e8;
  --text-dim: #888;
  --accent: #5b9fff;
  --accent-dim: #3a7bd5;
  --border: #2a2e3a;
  --green: #4caf50;
  --orange: #ff9800;
  --red: #f44336;
  --radius: 10px;
}

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

body {
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: #7ab8ff; }

.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* Hero */
.hero {
  text-align: center;
  padding: 80px 20px 60px;
  background: linear-gradient(180deg, #131620 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
}
.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 10px;
  background: linear-gradient(135deg, #5b9fff, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero .tagline {
  font-size: 1.25rem;
  color: var(--text);
  margin-bottom: 6px;
}
.hero .subtitle {
  font-size: 0.95rem;
  color: var(--text-dim);
  margin-bottom: 30px;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all .2s;
  border: none;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dim); color: #fff; }
.btn-outline { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-outline:hover { background: var(--accent); color: #fff; }
.btn-large { padding: 14px 36px; font-size: 1.1rem; }

/* Nav */
.topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,17,23,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.nav-inner { display: flex; justify-content: space-between; align-items: center; }
.nav-logo { font-weight: 700; font-size: 1.1rem; color: var(--text); }
.nav-links { display: flex; gap: 20px; }
.nav-links a { color: var(--text-dim); font-size: 0.9rem; }
.nav-links a:hover { color: var(--text); }

/* Sections */
.section { padding: 60px 0; border-bottom: 1px solid var(--border); }
.section h2 { font-size: 1.8rem; margin-bottom: 12px; }
.section-desc { color: var(--text-dim); margin-bottom: 30px; font-size: 0.95rem; }

/* Publication grid */
.pub-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.pub-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all .2s;
}
.pub-card:hover { border-color: var(--accent); background: var(--bg-hover); }
.pub-card h3 { font-size: 1.2rem; margin-bottom: 8px; }
.pub-card .pub-desc { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 12px; }
.pub-card .pub-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.pub-card .pub-tag { background: var(--bg-hover); padding: 2px 10px; border-radius: 20px; font-size: 0.75rem; color: var(--text-dim); }
.pub-card .pub-meta { font-size: 0.8rem; color: var(--text-dim); display: flex; gap: 12px; }
.pub-card .pub-links { margin-top: 12px; display: flex; gap: 12px; }
.pub-card .pub-links a { font-size: 0.85rem; }

.loading { text-align: center; color: var(--text-dim); padding: 40px; }

/* Architecture grid */
.arch-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.arch-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}
.arch-icon { font-size: 2.5rem; margin-bottom: 10px; }
.arch-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.arch-card p { color: var(--text-dim); font-size: 0.85rem; margin-bottom: 10px; }
.arch-card code { background: var(--bg-hover); padding: 3px 10px; border-radius: 6px; font-size: 0.8rem; color: var(--accent); }

/* Rules */
.rules-content { display: flex; flex-direction: column; gap: 30px; }
.rule-block { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.rule-block h3 { font-size: 1.15rem; margin-bottom: 12px; color: var(--accent); }
.rule-block ol, .rule-block ul { padding-left: 20px; }
.rule-block li { margin-bottom: 6px; color: var(--text); font-size: 0.9rem; }
.rule-block li ul { margin-top: 4px; }
.rule-block code { background: var(--bg-hover); padding: 2px 8px; border-radius: 4px; font-size: 0.85rem; }

.label { display: inline-block; padding: 2px 10px; border-radius: 4px; font-size: 0.75rem; font-weight: 600; }
.label-pending { background: #fbca04; color: #000; }
.label-revise { background: #d29922; color: #fff; }
.label-accept { background: #2f81f7; color: #fff; }
.label-reject { background: #f85149; color: #fff; }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 24px;
}
.faq-item summary { font-weight: 600; cursor: pointer; font-size: 0.95rem; }
.faq-item p { margin-top: 10px; color: var(--text-dim); font-size: 0.9rem; }
.faq-item code { background: var(--bg-hover); padding: 2px 6px; border-radius: 4px; font-size: 0.85rem; }

/* CTA */
.cta-section { text-align: center; }
.cta-section p { color: var(--text-dim); margin-bottom: 20px; }

/* Footer */
.footer { text-align: center; padding: 40px 20px; color: var(--text-dim); font-size: 0.85rem; }
.footer-tech { font-family: monospace; font-size: 0.8rem; margin: 6px 0; }

@media (max-width: 640px) {
  .hero h1 { font-size: 2rem; }
  .hero .tagline { font-size: 1rem; }
  .nav-links { gap: 12px; }
  .nav-links a { font-size: 0.8rem; }
}