:root {
  color-scheme: dark;
  --bg: #000;
  --surface: #121213;
  --surface-2: #1a1a1b;
  --line: #27282b;
  --text: #f8f9fa;
  --text-2: #b7b9bd;
  --muted: #8d9095;
  --accent: #00c2de;
  --blue: #2899ff;
  --grid: #222326;
  --font: "Segoe UI Variable Display", "Segoe UI", Inter, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); border: 0;
}

.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px clamp(16px, 5vw, 64px);
  background: rgba(0, 0, 0, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--text); text-decoration: none;
  font-weight: 800; letter-spacing: 0.14em; font-size: 15px;
}
.brand img { border-radius: 6px; }

.sitenav { display: flex; align-items: center; gap: 4px; margin: 0 auto 0 40px; }
.sitenav a {
  color: var(--text-2); text-decoration: none; font-size: 14px; font-weight: 600;
  padding: 8px 12px; border-radius: 3px; white-space: nowrap;
}
.sitenav a:hover { color: var(--text); background: var(--surface-2); }
.sitenav a[aria-current="true"] { color: var(--text); box-shadow: inset 0 -2px 0 var(--accent); }
.sitenav a.nav-cta { color: #000; background: var(--accent); margin-left: 8px; }
.sitenav a.nav-cta:hover { background: #33d2ea; }
.sitenav a:focus-visible, .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.lang { display: flex; align-items: center; gap: 6px; color: var(--muted); }
.lang button {
  font: inherit; font-size: 14px; font-weight: 600;
  color: var(--muted); background: none; border: 0; padding: 6px 4px; cursor: pointer;
}
.lang button[aria-pressed="true"] { color: var(--text); box-shadow: inset 0 -2px 0 var(--accent); }
.lang button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

main { padding: 0 clamp(16px, 5vw, 64px); max-width: 1240px; margin: 0 auto; }
section[id] { scroll-margin-top: 72px; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

.hero {
  padding: clamp(56px, 10vw, 120px) 0 clamp(40px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
  background: radial-gradient(80% 60% at 85% 20%, rgba(0, 194, 222, 0.10), transparent 60%);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 13px; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(36px, 6.2vw, 72px);
  line-height: 1.05; font-weight: 700; letter-spacing: -0.02em;
}
.accent { color: var(--accent); }

.lede { max-width: 720px; margin: 24px 0 0; color: var(--text-2); font-size: clamp(16px, 1.6vw, 19px); }

.stats {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px; margin-top: 48px;
  background: var(--line); border: 1px solid var(--line);
}
.stat { background: var(--bg); padding: 22px 22px 20px; }
.stat-value { display: block; font-size: clamp(28px, 3.4vw, 42px); font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; }
.stat-label { display: block; margin-top: 8px; color: var(--muted); font-size: 14px; }
.stat-value small { font-size: 0.45em; font-weight: 600; color: var(--muted); letter-spacing: 0; }

.section { padding: clamp(56px, 8vw, 96px) 0; border-bottom: 1px solid var(--line); }
.section-head { margin-bottom: 28px; }
h2 { margin: 0; font-size: clamp(28px, 3.6vw, 44px); line-height: 1.12; font-weight: 700; letter-spacing: -0.015em; }
.section-sub { margin: 12px 0 0; color: var(--text-2); max-width: 760px; }
h3 { margin: 0 0 10px; font-size: 20px; line-height: 1.3; font-weight: 700; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: 4px; padding: 24px; }
.card p { margin: 0; color: var(--text-2); }

.legend { display: flex; flex-wrap: wrap; gap: 18px; margin: 0 0 14px; color: var(--text-2); font-size: 14px; }
.legend-item { display: inline-flex; align-items: center; gap: 8px; }

.chart-card { position: relative; background: var(--surface); border: 1px solid var(--line); border-radius: 4px; padding: 16px 8px 8px; }
.chart { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.chart svg { display: block; width: 100%; min-width: 760px; height: auto; overflow: visible; }
.chart .tick text, .chart .xlab { fill: var(--muted); font-size: 12px; font-family: var(--font); }
.chart .xlab { font-weight: 600; fill: var(--text-2); }
.chart .gridline { stroke: var(--grid); stroke-width: 1; }
.chart .zero { stroke: #3a3b3f; stroke-width: 1; }
.chart .ref { stroke: #5b5d62; stroke-width: 1; stroke-dasharray: 4 4; }
.chart .ref-label { fill: var(--muted); font-size: 11.5px; font-family: var(--font); }
.chart .whisker { stroke-width: 2; stroke-linecap: round; }
.chart .hit { fill: transparent; cursor: pointer; }
.chart .point { stroke: var(--surface); stroke-width: 2; }
.chart .value-label { fill: var(--text); font-size: 12px; font-weight: 700; font-family: var(--font); }

.tooltip {
  position: absolute; pointer-events: none; z-index: 5;
  min-width: 220px; max-width: 280px;
  background: #0a0a0b; border: 1px solid #3a3b3f; border-radius: 4px;
  padding: 12px 14px; font-size: 13px; color: var(--text-2);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
}
.tooltip strong { color: var(--text); font-size: 14px; }
.tooltip .tt-value { color: var(--text); font-size: 18px; font-weight: 700; margin: 4px 0; }

.pipeline { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.step { position: relative; }
.step-n { margin: 0 0 18px !important; color: var(--accent) !important; font-size: 14px; font-weight: 700; letter-spacing: 0.1em; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 4px; }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { padding: 14px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-size: 12px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; background: var(--surface); }
tbody tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
td .vname { display: block; color: var(--text); font-weight: 700; }
td .vid { color: var(--muted); font-size: 13px; }
td .what { color: var(--text-2); }
td .ci { color: var(--muted); }

.badge {
  display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
  font-size: 12px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 4px 8px; border-radius: 3px; border: 1px solid var(--line); color: var(--text-2);
}
.badge.adopted { color: var(--accent); border-color: rgba(0, 194, 222, 0.5); }
.badge.running { color: var(--blue); border-color: rgba(40, 153, 255, 0.5); }
.badge.baseline { color: var(--text); }

.lessons { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }

.running { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.run-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.run-value { font-size: 28px; font-weight: 700; color: var(--text); margin: 10px 0 2px; }
.bar { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; margin: 16px 0 8px; }
.bar > span { display: block; height: 100%; background: var(--blue); border-radius: 3px; }
.run-meta { color: var(--muted); font-size: 14px; }

.contact { border-bottom: 0; }
.contact-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 32px; align-items: center; }
.contact-card { padding: 28px; }
.contact-label { margin: 0 0 6px !important; color: var(--muted) !important; font-size: 13px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.contact-email { display: inline-block; color: var(--text); font-size: clamp(20px, 2.4vw, 28px); font-weight: 700; text-decoration: none; word-break: break-all; }
.contact-email:hover { color: var(--accent); }
.contact-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.btn {
  font: inherit; font-size: 15px; font-weight: 700; cursor: pointer; text-decoration: none;
  padding: 11px 18px; border-radius: 3px; border: 1px solid var(--line); display: inline-flex; align-items: center;
}
.btn-primary { background: var(--accent); color: #000; border-color: var(--accent); }
.btn-primary:hover { background: #33d2ea; }
.btn-ghost { background: none; color: var(--text); }
.btn-ghost:hover { background: var(--surface-2); }
.contact-resume { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line); }
.contact-status { min-height: 1.4em; margin: 12px 0 0 !important; color: var(--muted) !important; font-size: 14px; }

.footer {
  max-width: 1240px; margin: 0 auto;
  padding: 32px clamp(16px, 5vw, 64px) 56px;
  color: var(--muted); font-size: 13px;
}
.footer p { margin: 0 0 6px; }

@media (max-width: 1080px) {
  .topbar { flex-wrap: wrap; row-gap: 6px; }
  .sitenav { order: 3; width: 100%; margin: 0 -8px; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
  .sitenav::-webkit-scrollbar { display: none; }
}

@media (max-width: 900px) {
  .contact-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pipeline { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lessons, .running { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .pipeline { grid-template-columns: 1fr; }
  th, td { padding: 12px 10px; }
  td .what { display: none; }
}