/* OpenTerminal 官网 —— 双主题 (深色默认 / 浅色)
   排版: Space Grotesk (展示) + JetBrains Mono (等宽), 自托管 woff2
   单一强调色: 终端绿 (深底 #3fb950, 浅底 #1a7f37) */

@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('assets/fonts/space-grotesk-400.woff2') format('woff2');
}
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('assets/fonts/space-grotesk-500.woff2') format('woff2');
}
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('assets/fonts/space-grotesk-600.woff2') format('woff2');
}
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('assets/fonts/space-grotesk-700.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('assets/fonts/jetbrains-mono-400.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('assets/fonts/jetbrains-mono-500.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('assets/fonts/jetbrains-mono-600.woff2') format('woff2');
}

/* ---- 主题令牌: 深色为默认 ---- */
:root {
  color-scheme: dark;

  --bg: #0b0e12;
  --bg-alt: #0d1219;
  --surface: #11161e;
  --surface-2: #161c26;

  --text: #e6ebe6;
  --text-2: #99a49c;
  --text-3: #6f7a72;

  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);

  --accent: #3fb950;
  --accent-hover: #34a24a;
  --accent-text: #4fd067;
  --accent-soft: rgba(63, 185, 80, 0.12);
  --btn-fg: #06210d;

  --overlay-1: rgba(255, 255, 255, 0.03);
  --overlay-2: rgba(255, 255, 255, 0.06);
  --overlay-3: rgba(255, 255, 255, 0.08);
  --overlay-row: rgba(255, 255, 255, 0.02);

  --grid-line: rgba(255, 255, 255, 0.03);
  --grid-line-soft: rgba(255, 255, 255, 0.022);
  --nav-bg: rgba(11, 14, 18, 0.82);

  --glow-1: rgba(63, 185, 80, 0.15);
  --glow-2: rgba(63, 185, 80, 0.07);
  --grain: 0.045;

  --shadow-card: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 18px 48px -24px rgba(0, 0, 0, 0.9);
  --shadow-lift: 0 1px 0 rgba(255, 255, 255, 0.06) inset, 0 28px 64px -28px rgba(0, 0, 0, 1);
  --shadow-shot: 0 2px 10px rgba(0, 0, 0, 0.5), 0 36px 88px -32px rgba(0, 0, 0, 0.95);

  --display: 'Space Grotesk', 'Segoe UI', 'Microsoft YaHei', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'Cascadia Mono', Consolas, monospace;

  --radius: 10px;
  --radius-lg: 14px;
}

html[data-theme='light'] {
  color-scheme: light;

  --bg: #fafbf9;
  --bg-alt: #f1f4f0;
  --surface: #ffffff;
  --surface-2: #fbfdfa;

  --text: #151a16;
  --text-2: #59615a;
  --text-3: #8b948c;

  --border: #e1e6df;
  --border-strong: #cbd3ca;

  --accent: #1a7f37;
  --accent-hover: #146227;
  --accent-text: #1a7f37;
  --accent-soft: rgba(26, 127, 55, 0.09);
  --btn-fg: #ffffff;

  --overlay-1: rgba(21, 26, 22, 0.03);
  --overlay-2: rgba(21, 26, 22, 0.05);
  --overlay-3: rgba(21, 26, 22, 0.06);
  --overlay-row: rgba(21, 26, 22, 0.02);

  --grid-line: rgba(21, 26, 22, 0.05);
  --grid-line-soft: rgba(21, 26, 22, 0.035);
  --nav-bg: rgba(250, 251, 249, 0.86);

  --glow-1: rgba(26, 127, 55, 0.1);
  --glow-2: rgba(26, 127, 55, 0.05);
  --grain: 0.02;

  --shadow-card: 0 1px 2px rgba(23, 32, 24, 0.06), 0 18px 40px -24px rgba(23, 32, 24, 0.22);
  --shadow-lift: 0 2px 4px rgba(23, 32, 24, 0.08), 0 28px 56px -26px rgba(23, 32, 24, 0.28);
  --shadow-shot: 0 2px 8px rgba(23, 32, 24, 0.12), 0 32px 72px -32px rgba(23, 32, 24, 0.35);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', 'Microsoft YaHei', -apple-system, 'PingFang SC', 'Noto Sans SC', sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  transition: background-color 0.3s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px;
}

.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

h1, h2, h3 {
  font-family: var(--display);
  font-weight: 700;
  text-wrap: balance;
  color: var(--text);
}

p { text-wrap: pretty; }

img { max-width: 100%; }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--accent);
  color: var(--btn-fg);
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
}
.skip-link:focus { left: 12px; top: 12px; }

section[id], .site-nav { scroll-margin-top: 76px; }

/* ---- nav ---- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 62px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
  flex-shrink: 0;
}

.brand img { border-radius: 6px; }

.nav-right { display: flex; align-items: center; gap: 10px; }

.nav-links { display: flex; gap: 2px; }

.nav-links a {
  color: var(--text-2);
  text-decoration: none;
  font-size: 14.5px;
  padding: 7px 13px;
  border-radius: 7px;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-links a:hover { color: var(--text); background: var(--overlay-2); }
.nav-links a.is-current { color: var(--text); background: var(--accent-soft); }

.theme-toggle {
  position: relative;
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text-2);
  cursor: pointer;
  flex-shrink: 0;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease, transform 0.15s ease;
}
.theme-toggle:hover { color: var(--accent-text); border-color: var(--accent); transform: translateY(-1px); }
.theme-toggle:active { transform: translateY(0) scale(0.97); }

.theme-toggle svg { position: absolute; transition: opacity 0.25s ease, transform 0.35s ease; }
.theme-toggle .icon-sun { opacity: 0; transform: rotate(-60deg) scale(0.7); }
.theme-toggle .icon-moon { opacity: 1; transform: none; }

html[data-theme='light'] .theme-toggle .icon-sun { opacity: 1; transform: none; }
html[data-theme='light'] .theme-toggle .icon-moon { opacity: 0; transform: rotate(60deg) scale(0.7); }

/* ---- hero ---- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 92px 0 0;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(1100px 500px at 80% -15%, var(--glow-1), transparent 62%),
    radial-gradient(760px 420px at -10% 115%, var(--glow-2), transparent 58%),
    var(--bg);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(900px 620px at 50% 0%, #000 32%, transparent 100%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  opacity: var(--grain);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1.12fr;
  gap: 56px;
  align-items: center;
}

.hero-kicker {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-text);
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(34px, 4.6vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.hero h1 .accent { color: var(--accent-text); }

.hero-sub {
  margin-top: 22px;
  max-width: 46ch;
  color: var(--text-2);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 11px 24px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
}

.btn:active { transform: translateY(1px) scale(0.99); }

.btn-primary {
  background: var(--accent);
  color: var(--btn-fg);
  box-shadow: 0 10px 28px -10px rgba(63, 185, 80, 0.5);
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-ghost {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--overlay-1);
}
.btn-ghost:hover { border-color: var(--accent); background: var(--overlay-2); }

.hero-note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-2);
}
.hero-note .mono { color: var(--text); }

.hero-shot { min-width: 0; }

.hero-shot img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-shot);
}

.hero-shot figcaption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-2);
  text-align: center;
}

.spec-strip {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
  padding: 40px 0 48px;
  margin-top: 48px;
  font-size: 14px;
  color: var(--text-2);
  border-top: 1px solid var(--border);
}

.spec-strip strong { color: var(--text); font-weight: 600; }
.spec-strip .mono { font-size: 13px; }

/* ---- shared section chrome ---- */
section { position: relative; }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
}

.section-eyebrow {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-text);
  margin-bottom: 12px;
}

.features h2, .download h2, .changelog h2 {
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.section-sub {
  margin-top: 14px;
  color: var(--text-2);
  max-width: 62ch;
  font-size: 16.5px;
}

.grid-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.features > .container { position: relative; z-index: 1; }

/* ---- capability track (horizontal scroll) ---- */
.features { padding: 92px 0 100px; background: var(--bg); }

.cap-controls { display: flex; gap: 8px; flex-shrink: 0; }

.track-btn {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.15s ease;
}
.track-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent-text); transform: translateY(-1px); }
.track-btn:active:not(:disabled) { transform: translateY(0) scale(0.97); }
.track-btn:disabled { opacity: 0.35; cursor: default; }

.cap-track {
  display: flex;
  gap: 20px;
  margin-top: 44px;
  padding: 4px 28px 22px;
  margin-left: -28px;
  margin-right: -28px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  scrollbar-width: none;
  cursor: grab;
  mask-image: linear-gradient(90deg, transparent 0, #000 28px, #000 calc(100% - 28px), transparent 100%);
}
.cap-track::-webkit-scrollbar { display: none; }
.cap-track.is-dragging { cursor: grabbing; scroll-snap-type: none; }

.cap-card {
  flex: 0 0 clamp(292px, 30vw, 366px);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 26px 24px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.cap-card:hover {
  border-color: var(--accent);
  background: var(--surface-2);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
}

.cap-num {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--accent-text);
  letter-spacing: 0.1em;
}

.cap-card h3 { font-size: 19px; letter-spacing: -0.01em; }

.cap-card ul { list-style: none; display: grid; gap: 9px; margin-top: 2px; }

.cap-card li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--text-2);
}

.cap-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--accent);
}

.cap-hint {
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--text-3);
}

/* ---- media rows (screenshot + copy) ---- */
.feature-row {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 60px;
  align-items: center;
  margin-top: 84px;
}
.feature-row:first-of-type { margin-top: 76px; }

.feature-copy { min-width: 0; }

.feature-copy h3 { font-size: 21px; letter-spacing: -0.015em; margin-bottom: 14px; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-text);
  margin-bottom: 12px;
}

.feature-copy ul { list-style: none; display: grid; gap: 10px; }

.feature-copy li {
  position: relative;
  padding-left: 18px;
  color: var(--text-2);
  font-size: 15px;
}

.feature-copy li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--accent);
}

.feature-shot { min-width: 0; }

.feature-shot img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-shot);
  background: var(--surface);
}

.feature-shot img + img { margin-top: 16px; }
.feature-shot img.narrow { width: 78%; }

.feature-shot figcaption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-2);
  text-align: center;
}

/* ---- download ---- */
.download {
  padding: 92px 0 100px;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.dl-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 44px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  font-size: 14.5px;
}

.dl-table th, .dl-table td {
  text-align: left;
  padding: 15px 20px;
  vertical-align: top;
}

.dl-table thead th {
  background: var(--accent-soft);
  color: var(--text-2);
  font-family: var(--mono);
  font-weight: 500;
  font-size: 12.5px;
  letter-spacing: 0.06em;
}

.dl-table tbody td { color: var(--text-2); }
.dl-table tbody tr + tr td { border-top: 1px solid var(--border); }
.dl-table tbody tr:hover td { background: var(--overlay-row); }

.dl-table a {
  color: var(--accent-text);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid transparent;
}
.dl-table a:hover { border-bottom-color: currentColor; }

.dl-table .sep { color: var(--border-strong); margin: 0 8px; }
.dl-table .mono { color: var(--text); }

.update-note { margin-top: 44px; max-width: 74ch; }

.update-note h3 { font-size: 16px; margin-bottom: 8px; }

.update-note p { color: var(--text-2); font-size: 14.5px; }

/* ---- changelog ---- */
.changelog { padding: 92px 0 100px; background: var(--bg); }

.changelog-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-top: 44px;
}

.changelog-list article {
  border-top: 2px solid var(--border);
  padding-top: 18px;
  transition: border-color 0.25s ease;
}
.changelog-list article:hover { border-top-color: var(--accent); }

.changelog-list article h3 {
  font-family: var(--mono);
  font-size: 14.5px;
  font-weight: 600;
  margin-bottom: 14px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.changelog-list .rel-date { color: var(--text-3); font-weight: 400; font-size: 12.5px; }

.changelog-list ul { list-style: none; display: grid; gap: 8px; }

.changelog-list li { font-size: 14px; color: var(--text-2); }

.changelog-more { margin-top: 44px; font-size: 14px; color: var(--text-2); }

.changelog-more a { color: var(--accent-text); font-weight: 500; text-decoration: none; }
.changelog-more a:hover { border-bottom: 1px solid currentColor; }

/* ---- footer ---- */
.site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 34px 0;
  font-size: 13.5px;
  color: var(--text-2);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
}

.footer-inner .mono { font-size: 12.5px; color: var(--text-3); }

/* ---- scroll reveal ---- */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  }
  .reveal.is-in { opacity: 1; transform: none; }
}

/* ---- responsive ---- */
@media (max-width: 1024px) {
  .feature-row { grid-template-columns: 1fr; gap: 36px; }
  .feature-row .feature-shot { order: -1; }
  .feature-shot img.narrow { width: 100%; }
}

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero { padding-top: 60px; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 20px; }
  .changelog-list { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 640px) {
  .container { padding: 0 20px; }
  .nav-inner { height: 56px; }
  .nav-links { gap: 0; }
  .nav-links a { font-size: 13.5px; padding: 6px 8px; }
  .hero h1 { font-size: 30px; }
  .spec-strip { gap: 16px 24px; }
  .cap-track { padding: 4px 20px 20px; margin-left: -20px; margin-right: -20px; }
  .dl-table { display: block; overflow-x: auto; white-space: nowrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}