:root {
  --bg: #0b0f14;
  --bg-elev: #121821;
  --bg-card: #161e29;
  --bg-card-hover: #1c2634;
  --line: rgba(148, 163, 184, 0.14);
  --text: #e8eef7;
  --muted: #94a3b8;
  --faint: #64748b;
  --accent: #5eead4;
  --accent-2: #7dd3fc;
  --accent-dim: rgba(94, 234, 212, 0.12);
  --warn: #fbbf24;
  --ok: #34d399;
  --pod: #a78bfa;
  --paper: #38bdf8;
  --mile: #5eead4;
  --radius: 16px;
  --shadow: 0 18px 50px rgba(0,0,0,.35);
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --max: 1120px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(94,234,212,.12), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(125,211,252,.10), transparent 50%),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}
a { color: var(--accent-2); text-decoration: none; }
a:hover { color: var(--accent); }
img { max-width: 100%; display: block; }
.container { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

/* Nav */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(11,15,20,.72);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .9rem 0;
}
.brand {
  display: flex; align-items: center; gap: .7rem;
  color: var(--text); font-weight: 700; letter-spacing: .02em;
}
.brand-mark {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 24px rgba(94,234,212,.35);
  display: grid; place-items: center; color: #042f2e; font-size: .85rem;
}
.nav-links { display: flex; gap: .2rem; flex-wrap: wrap; }
.nav-links a {
  color: var(--muted); padding: .45rem .8rem; border-radius: 999px;
  font-size: .92rem; transition: .2s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text); background: var(--accent-dim);
}

/* Hero */
.hero {
  padding: 3.5rem 0 2rem;
  display: grid; gap: 1.4rem;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  color: var(--accent); font-size: .85rem; font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase;
}
.hero h1 {
  margin: 0; font-size: clamp(2rem, 4.5vw, 3.2rem);
  line-height: 1.15; letter-spacing: -.02em;
}
.hero .lead { color: var(--muted); font-size: 1.08rem; max-width: 46rem; margin: 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: .4rem; }
.btn {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .7rem 1.15rem; border-radius: 999px; font-weight: 600;
  border: 1px solid var(--line); color: var(--text); background: var(--bg-elev);
  transition: .2s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, rgba(94,234,212,.2), rgba(125,211,252,.15));
  border-color: rgba(94,234,212,.35); color: var(--accent);
}

/* Sections */
section { padding: 2.2rem 0; }
.section-head {
  display: flex; align-items: end; justify-content: space-between;
  gap: 1rem; margin-bottom: 1.4rem; flex-wrap: wrap;
}
.section-head h2 { margin: 0; font-size: 1.55rem; letter-spacing: -.01em; }
.section-head p { margin: .25rem 0 0; color: var(--muted); font-size: .95rem; }

/* Timeline */
.timeline { position: relative; padding-left: 1.2rem; }
.timeline::before {
  content: ""; position: absolute; left: 7px; top: .3rem; bottom: .3rem;
  width: 2px; background: linear-gradient(var(--accent), transparent);
  opacity: .45;
}
.tl-item {
  position: relative; padding: 0 0 1.35rem 1.4rem;
}
.tl-item::before {
  content: ""; position: absolute; left: -1.2rem; top: .55rem;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--mile); box-shadow: 0 0 0 4px rgba(94,234,212,.15);
}
.tl-item[data-type="podcast"]::before { background: var(--pod); box-shadow: 0 0 0 4px rgba(167,139,250,.15); }
.tl-item[data-type="paper"]::before { background: var(--paper); box-shadow: 0 0 0 4px rgba(56,189,248,.15); }
.tl-meta {
  display: flex; flex-wrap: wrap; gap: .45rem; align-items: center;
  margin-bottom: .25rem;
}
.year-pill, .type-pill, .status {
  font-size: .75rem; font-weight: 700; letter-spacing: .04em;
  padding: .2rem .55rem; border-radius: 999px;
}
.year-pill { background: rgba(148,163,184,.12); color: var(--muted); }
.type-pill.milestone { background: var(--accent-dim); color: var(--accent); }
.type-pill.podcast { background: rgba(167,139,250,.15); color: #c4b5fd; }
.type-pill.paper { background: rgba(56,189,248,.15); color: #7dd3fc; }
.tl-item h3 { margin: 0 0 .35rem; font-size: 1.05rem; }
.tl-item p { margin: 0; color: var(--muted); font-size: .95rem; }
.tags { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: .55rem; }
.tag {
  font-size: .72rem; color: var(--faint); border: 1px solid var(--line);
  padding: .15rem .45rem; border-radius: 6px;
}

/* Cards */
.grid {
  display: grid; gap: 1.1rem;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.card {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: .22s;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-3px); background: var(--bg-card-hover); border-color: rgba(94,234,212,.28); }
.card-media {
  aspect-ratio: 16 / 10; background:
    linear-gradient(145deg, #1e293b, #0f172a 60%, #134e4a);
  position: relative; overflow: hidden;
}
.card-media img {
  width: 100%; height: 100%; object-fit: cover; object-position: center top;
}
.card-media .placeholder {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: var(--muted); font-size: .9rem; padding: 1rem; text-align: center;
}
.card-body { padding: 1.05rem 1.1rem 1.2rem; display: grid; gap: .55rem; flex: 1; }
.card-body h3 { margin: 0; font-size: 1.02rem; line-height: 1.35; }
.card-body .meta { color: var(--muted); font-size: .82rem; }
.claim {
  color: var(--text); font-size: .92rem;
  border-left: 3px solid var(--accent); padding-left: .7rem;
}

/* Podcast list */
.pod-list { display: grid; gap: .9rem; }
.pod-row {
  display: grid; grid-template-columns: 1fr auto; gap: 1rem; align-items: start;
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.1rem 1.2rem;
  transition: .2s;
}
.pod-row:hover { border-color: rgba(167,139,250,.35); }
.pod-row h3 { margin: 0 0 .35rem; font-size: 1.05rem; }
.pod-row .show { color: var(--pod); font-weight: 600; font-size: .85rem; }
.status.live { background: rgba(52,211,153,.15); color: var(--ok); }
.status.wip { background: rgba(251,191,36,.12); color: var(--warn); }

/* Paper detail blocks */
.paper-detail {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px); overflow: hidden;
  margin-bottom: 1.5rem; box-shadow: var(--shadow);
}
.paper-detail .visual {
  background: #0a1018; border-bottom: 1px solid var(--line);
}
.paper-detail .visual img {
  width: 100%; max-height: 360px; object-fit: contain; margin: 0 auto;
  background: #0a1018;
}
.paper-detail .content { padding: 1.35rem 1.4rem 1.5rem; }
.paper-detail h3 { margin: 0 0 .4rem; font-size: 1.25rem; }
.kv { display: grid; gap: .85rem; margin-top: 1rem; }
.kv h4 {
  margin: 0 0 .3rem; font-size: .78rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent);
}
.kv p, .kv li { color: var(--muted); margin: 0; }
.kv ul { padding-left: 1.1rem; display: grid; gap: .35rem; }

/* Audio player */
.player-box {
  background: linear-gradient(160deg, rgba(94,234,212,.08), rgba(125,211,252,.05));
  border: 1px solid rgba(94,234,212,.25);
  border-radius: var(--radius); padding: 1.2rem 1.3rem; margin: 1.2rem 0;
}
.player-box audio { width: 100%; margin-top: .7rem; }
.note {
  font-size: .88rem; color: var(--muted);
  background: rgba(148,163,184,.08); border-radius: 12px;
  padding: .85rem 1rem; border: 1px solid var(--line);
}
.note strong { color: var(--warn); }

/* About / misc */
.prose { max-width: 42rem; color: var(--muted); }
.prose h2 { color: var(--text); }
.footer {
  border-top: 1px solid var(--line); margin-top: 3rem;
  padding: 1.5rem 0 2.5rem; color: var(--faint); font-size: .85rem;
}
.chip-row { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1rem 0; }
.stat {
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: 14px; padding: .9rem 1rem; min-width: 120px;
}
.stat b { display: block; font-size: 1.35rem; color: var(--accent); }
.stat span { color: var(--muted); font-size: .8rem; }

.era-label {
  margin: 2rem 0 .9rem; font-size: .85rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent); font-weight: 700;
}

@media (max-width: 720px) {
  .nav { flex-direction: column; align-items: flex-start; }
  .pod-row { grid-template-columns: 1fr; }
  .hero { padding-top: 2.2rem; }
}