/* AgentGuide product site — shared design system
   Theme: "control tower" — deep ink-blue ground, amber signal accent, steel diagram lines */

:root {
  /* light theme (cool paper) */
  --bg: #edf1f7;
  --surface: #ffffff;
  --surface-2: #e2e8f1;
  --ink: #17202e;
  --ink-2: #46536a;
  --ink-3: #6e7b8f;
  --line: #d3dae5;
  --line-2: #bfc9d9;
  --accent: #a06105;
  --accent-strong: #7f4c02;
  --accent-soft: rgba(160, 97, 5, 0.1);
  --steel: #38699e;
  --good: #2e7d5b;
  --bad: #b4453d;
  --band-bg: #17202e;
  --band-ink: #e9edf4;
  --band-ink-2: #a7b2c4;
  --band-line: #2c3d5c;
  --band-accent: #e8a83e;
  --code-bg: #10182a;
  --code-ink: #cfd8e6;

  --font-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", "Trebuchet MS", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Instrument Sans", "Helvetica Neue", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --maxw: 1120px;
  --radius: 6px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b111e;
    --surface: #121a2a;
    --surface-2: #1a2539;
    --ink: #e9edf4;
    --ink-2: #a7b2c4;
    --ink-3: #7c889d;
    --line: #223049;
    --line-2: #2d3e5e;
    --accent: #e8a83e;
    --accent-strong: #f2be63;
    --accent-soft: rgba(232, 168, 62, 0.13);
    --steel: #6fa3d8;
    --good: #55b58a;
    --bad: #d9756c;
    --band-bg: #080d17;
    --band-ink: #e9edf4;
    --band-ink-2: #a7b2c4;
    --band-line: #26344f;
    --band-accent: #e8a83e;
    --code-bg: #0a101d;
    --code-ink: #cfd8e6;
  }
}

:root[data-theme="dark"] {
  --bg: #0b111e;
  --surface: #121a2a;
  --surface-2: #1a2539;
  --ink: #e9edf4;
  --ink-2: #a7b2c4;
  --ink-3: #7c889d;
  --line: #223049;
  --line-2: #2d3e5e;
  --accent: #e8a83e;
  --accent-strong: #f2be63;
  --accent-soft: rgba(232, 168, 62, 0.13);
  --steel: #6fa3d8;
  --good: #55b58a;
  --bad: #d9756c;
  --band-bg: #080d17;
  --band-ink: #e9edf4;
  --band-ink-2: #a7b2c4;
  --band-line: #26344f;
  --band-accent: #e8a83e;
  --code-bg: #0a101d;
  --code-ink: #cfd8e6;
}

:root[data-theme="light"] {
  --bg: #edf1f7;
  --surface: #ffffff;
  --surface-2: #e2e8f1;
  --ink: #17202e;
  --ink-2: #46536a;
  --ink-3: #6e7b8f;
  --line: #d3dae5;
  --line-2: #bfc9d9;
  --accent: #a06105;
  --accent-strong: #7f4c02;
  --accent-soft: rgba(160, 97, 5, 0.1);
  --steel: #38699e;
  --good: #2e7d5b;
  --bad: #b4453d;
  --band-bg: #17202e;
  --band-ink: #e9edf4;
  --band-ink-2: #a7b2c4;
  --band-line: #2c3d5c;
  --band-accent: #e8a83e;
  --code-bg: #10182a;
  --code-ink: #cfd8e6;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

h1, h2, h3 {
  font-family: var(--font-display);
  line-height: 1.15;
  text-wrap: balance;
  margin: 0;
}

p { margin: 0; }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- nav ---------- */

.nav {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 60px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  color: var(--ink);
  margin-right: auto;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  width: 11px;
  height: 11px;
  background: var(--accent);
  transform: rotate(45deg) translateY(-1px);
  display: inline-block;
  flex: none;
}

.brand-domain {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  gap: 4px;
  overflow-x: auto;
}

.nav-links a {
  color: var(--ink-2);
  font-size: 0.92rem;
  padding: 7px 12px;
  border-radius: var(--radius);
  white-space: nowrap;
}
.nav-links a:hover { color: var(--ink); text-decoration: none; background: var(--surface-2); }
.nav-links a[aria-current="page"] {
  color: var(--ink);
  background: var(--accent-soft);
  font-weight: 600;
}

.lang-switch {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 5px 12px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  color: var(--ink-2);
  white-space: nowrap;
}
.lang-switch:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

:lang(zh) .lede,
:lang(zh) .card p,
:lang(zh) .feature-list li,
:lang(zh) td {
  line-height: 1.75;
}

/* ---------- shared section furniture ---------- */

.section { padding: 76px 0; }
.section + .section { border-top: 1px solid var(--line); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--accent);
  flex: none;
}

.section h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 700;
  max-width: 26ch;
  margin-bottom: 14px;
}

.lede {
  color: var(--ink-2);
  font-size: 1.06rem;
  max-width: 62ch;
}

.kicker {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ---------- hero ---------- */

.hero { padding: 84px 0 72px; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 56px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2.3rem, 5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.015em;
  margin-bottom: 20px;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero .lede { margin-bottom: 30px; }

.cta-row { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--accent);
  color: var(--bg);
}
.btn-primary:hover { background: var(--accent-strong); }

.btn-ghost {
  border-color: var(--line-2);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* hero diagram */

.diagram-frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 18px;
  overflow-x: auto;
}

.diagram-frame .kicker { margin-bottom: 10px; display: block; }

.diagram-frame svg { display: block; width: 100%; height: auto; min-width: 520px; }

.dg-box { fill: var(--surface-2); stroke: var(--line-2); }
.dg-core { fill: var(--accent-soft); stroke: var(--accent); }
.dg-label {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: var(--ink-2);
  letter-spacing: 0.04em;
}
.dg-label-strong { fill: var(--ink); font-weight: 600; }
.dg-label-accent { fill: var(--accent); }
.dg-flow {
  fill: none;
  stroke: var(--steel);
  stroke-width: 1.4;
  stroke-dasharray: 5 5;
  animation: dgflow 1.6s linear infinite;
}
@keyframes dgflow { to { stroke-dashoffset: -20; } }
@media (prefers-reduced-motion: reduce) {
  .dg-flow { animation: none; }
}

/* ---------- stat strip ---------- */

.stat-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.stat-strip-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
}

.stat {
  padding: 22px 24px;
  border-left: 1px solid var(--line);
}
.stat:first-child { border-left: none; }

.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.stat span { font-size: 0.85rem; color: var(--ink-3); }

/* ---------- cards ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.card-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.card-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.card .kicker { color: var(--accent); }

.card h3 {
  font-size: 1.18rem;
  font-weight: 700;
}

.card p { color: var(--ink-2); font-size: 0.95rem; }

.card ul {
  margin: 4px 0 0;
  padding-left: 18px;
  color: var(--ink-2);
  font-size: 0.92rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.card .more { margin-top: auto; padding-top: 10px; font-size: 0.9rem; font-weight: 600; }

/* ---------- chips ---------- */

.chip-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }

.chip {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 6px 12px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  color: var(--ink-2);
  background: var(--surface);
}

.chip-accent { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

/* ---------- feature rows ---------- */

.feature-row {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
  gap: 48px;
  align-items: start;
  padding: 44px 0;
  border-top: 1px solid var(--line);
}
.feature-row:first-of-type { border-top: none; padding-top: 8px; }

.feature-row h3 { font-size: 1.35rem; font-weight: 700; margin-bottom: 10px; }
.feature-row .kicker { display: block; margin-bottom: 10px; color: var(--accent); }
.feature-row > div > p { color: var(--ink-2); max-width: 56ch; }

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  border-left: 2px solid var(--line-2);
  padding-left: 14px;
  font-size: 0.93rem;
  color: var(--ink-2);
}

.feature-list li b { display: block; color: var(--ink); font-weight: 600; margin-bottom: 2px; }

/* ---------- table ---------- */

.table-scroll { overflow-x: auto; margin-top: 36px; border: 1px solid var(--line); border-radius: var(--radius); }

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  font-size: 0.92rem;
  min-width: 720px;
}

th, td {
  text-align: left;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  background: var(--surface-2);
  font-weight: 600;
}

tbody tr:last-child td { border-bottom: none; }

td:first-child { font-weight: 600; white-space: nowrap; }
td { color: var(--ink-2); }

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  white-space: nowrap;
}
.tag-steel { background: transparent; border: 1px solid var(--line-2); color: var(--steel); }

/* ---------- dark band (flagship section) ---------- */

.band {
  background: var(--band-bg);
  color: var(--band-ink);
  padding: 84px 0;
  border-top: 1px solid var(--band-line);
  border-bottom: 1px solid var(--band-line);
}

.band .eyebrow { color: var(--band-accent); }
.band .eyebrow::before { background: var(--band-accent); }
.band h2 { color: var(--band-ink); }
.band .lede { color: var(--band-ink-2); }

.band .card {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--band-line);
}
.band .card h3 { color: var(--band-ink); }
.band .card p, .band .card ul { color: var(--band-ink-2); }
.band .card .kicker { color: var(--band-accent); }

.band .btn-primary { background: var(--band-accent); color: #10182a; }
.band .btn-primary:hover { background: #f2be63; }
.band .btn-ghost { border-color: var(--band-line); color: var(--band-ink); }
.band .btn-ghost:hover { border-color: var(--band-accent); color: var(--band-accent); }

/* ---------- code block ---------- */

.code-block {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: var(--radius);
  border: 1px solid var(--band-line);
  padding: 20px 22px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.65;
  margin-top: 30px;
}

.code-block .c { color: #667899; }
.code-block .k { color: #e8a83e; }
.code-block .s { color: #8fbe8f; }

pre { margin: 0; }

/* ---------- event table mock ---------- */

.mono-cell { font-family: var(--font-mono); font-size: 0.8rem; white-space: nowrap; }
.num { font-variant-numeric: tabular-nums; text-align: right; }
td.num { font-family: var(--font-mono); font-size: 0.82rem; }
.ok-dot, .err-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  margin-right: 7px;
  vertical-align: 1px;
}
.ok-dot { background: var(--good); }
.err-dot { background: var(--bad); }

/* ---------- pipeline (solutions page) ---------- */

.pipeline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 34px 0 6px;
}

.p-step {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 8px 14px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  white-space: nowrap;
}

.p-step small {
  display: block;
  font-size: 0.64rem;
  color: var(--ink-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 2px;
}

.p-human {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.p-human small { color: var(--accent); }

.p-arrow {
  font-family: var(--font-mono);
  color: var(--steel);
  flex: none;
  user-select: none;
}

.p-par {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 1px dashed var(--line-2);
  border-radius: var(--radius);
  padding: 8px;
}

.pipeline-caption {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 34px;
}

/* ---------- layer stack (why page) ---------- */

.layer-stack {
  margin-top: 36px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.layer {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) auto;
  gap: 8px 24px;
  align-items: baseline;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 22px;
}

.layer b {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
}

.layer p { color: var(--ink-2); font-size: 0.92rem; }

.tag-good { background: rgba(62, 155, 112, 0.14); color: var(--good); }
.tag-dim { background: transparent; border: 1px solid var(--line-2); color: var(--ink-3); }

@media (max-width: 760px) {
  .layer { grid-template-columns: 1fr auto; }
  .layer p { grid-column: 1 / -1; }
}

/* ---------- page header (subpages) ---------- */

.page-head { padding: 72px 0 56px; }
.page-head h1 {
  font-size: clamp(2rem, 4.5vw, 2.9rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
  max-width: 22ch;
}
.page-head .lede { max-width: 64ch; }

/* ---------- CTA + footer ---------- */

.cta-final { text-align: left; }
.cta-final .cta-row { margin-top: 26px; }

footer {
  border-top: 1px solid var(--line);
  padding: 40px 0 56px;
  color: var(--ink-3);
  font-size: 0.88rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 40px;
  align-items: baseline;
  justify-content: space-between;
}

.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-links a { color: var(--ink-2); }

.footer-domain { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.04em; }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .card-grid, .card-grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .feature-row { grid-template-columns: 1fr; gap: 24px; }
  .stat-strip-inner { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: none; }
  .stat { border-top: 1px solid var(--line); }
  .stat:nth-child(-n+2) { border-top: none; }
}

@media (max-width: 600px) {
  .card-grid, .card-grid.cols-2, .card-grid.cols-4 { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
  .nav-inner { gap: 12px; }
  .brand-domain { display: none; }
}