/* ------------------------------------------------------------------ *
 * APIServer portal — design system
 * Light/dark adaptive · pure CSS · no build step
 * Inspired by Linear, Stripe, Anthropic — but uniquely calibrated.
 * ------------------------------------------------------------------ */

:root {
  /* Base palette (light) */
  --bg-0: #fafafb;
  --bg-1: #ffffff;
  --bg-2: #f4f4f6;
  --bg-3: #ebebee;
  --border: #e3e3e8;
  --border-strong: #d2d2d8;
  --text-1: #14141a;
  --text-2: #4a4a55;
  --text-3: #74747f;
  --text-inv: #ffffff;

  --brand-1: #5b5bf6;
  --brand-2: #7d62f8;
  --brand-grad: linear-gradient(135deg, #5b5bf6 0%, #b94dff 100%);
  --brand-fg: #ffffff;

  --success: #0fa974;
  --warn: #d39d12;
  --danger: #e0394f;
  --info: #226ad3;

  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  --shadow-1: 0 1px 2px rgba(20,20,28,.04), 0 1px 1px rgba(20,20,28,.04);
  --shadow-2: 0 6px 24px -8px rgba(20,20,28,.10), 0 1px 2px rgba(20,20,28,.04);
  --shadow-3: 0 12px 40px -12px rgba(20,20,28,.16), 0 4px 8px rgba(20,20,28,.04);

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-8: 48px;
  --space-10: 64px;
  --space-12: 96px;

  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft Yahei UI", "Microsoft Yahei", sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-0: #0c0c10;
    --bg-1: #131317;
    --bg-2: #1a1a20;
    --bg-3: #232329;
    --border: #2a2a31;
    --border-strong: #36363f;
    --text-1: #f0f0f3;
    --text-2: #b4b4bd;
    --text-3: #777783;

    --brand-1: #7c75ff;
    --brand-2: #c673ff;
    --shadow-1: 0 1px 2px rgba(0,0,0,.4), 0 1px 1px rgba(0,0,0,.2);
    --shadow-2: 0 6px 24px -8px rgba(0,0,0,.5), 0 1px 2px rgba(0,0,0,.4);
    --shadow-3: 0 12px 40px -12px rgba(0,0,0,.65), 0 4px 8px rgba(0,0,0,.3);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-size: 15px; line-height: 1.55;
  color: var(--text-1);
  background: var(--bg-0);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--brand-1); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
code, pre, kbd { font-family: var(--font-mono); }

/* ------------ layout primitives ------------ */
.container { max-width: 1180px; margin: 0 auto; padding: 0 var(--space-5); }
.container-narrow { max-width: 760px; margin: 0 auto; padding: 0 var(--space-5); }

.row { display: flex; gap: var(--space-5); }
.col { flex: 1; min-width: 0; }
.spacer { flex: 1; }

.muted { color: var(--text-3); }
.dim   { color: var(--text-2); }

/* ------------ header / nav ------------ */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--bg-1) 90%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex; align-items: center; gap: var(--space-5);
  height: 60px;
  max-width: 1180px; margin: 0 auto; padding: 0 var(--space-5);
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 600; font-size: 17px; color: var(--text-1);
  letter-spacing: -.01em;
}
.brand:hover { text-decoration: none; }
.brand-dot {
  width: 24px; height: 24px; border-radius: 8px;
  background: var(--brand-grad);
  box-shadow: 0 0 0 1px rgba(255,255,255,.06) inset;
}
.nav-links { display: flex; gap: var(--space-5); }
.nav-link {
  color: var(--text-2); font-size: 14.5px;
  padding: 6px 4px; border-radius: 6px;
  transition: color .15s;
}
.nav-link:hover, .nav-link.active { color: var(--text-1); text-decoration: none; }
.nav-cta {
  display: flex; gap: var(--space-3); align-items: center; margin-left: auto;
}

/* ------------ buttons ------------ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 500; font-size: 14px; line-height: 1;
  padding: 10px 16px; border-radius: var(--radius);
  border: 1px solid transparent; background: transparent;
  color: var(--text-1); cursor: pointer; transition: all .15s ease;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--brand-grad); color: var(--brand-fg);
  box-shadow: var(--shadow-2);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-3); color: var(--brand-fg); }
.btn-secondary {
  background: var(--bg-1); border: 1px solid var(--border-strong); color: var(--text-1);
}
.btn-secondary:hover { background: var(--bg-2); }
.btn-ghost { color: var(--text-2); }
.btn-ghost:hover { background: var(--bg-2); color: var(--text-1); }
.btn-danger { color: var(--danger); }
.btn-danger:hover { background: rgba(224,57,79,.08); }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: 8px; }
.btn-lg { padding: 14px 22px; font-size: 15.5px; border-radius: 12px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

/* ------------ forms ------------ */
.field {
  display: flex; flex-direction: column; gap: 6px; margin-bottom: var(--space-4);
}
.field label { font-weight: 500; font-size: 13.5px; color: var(--text-2); }
.input, .select, .textarea {
  font-family: inherit; font-size: 14.5px;
  background: var(--bg-1); color: var(--text-1);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 11px 14px;
  outline: none; transition: border-color .15s, box-shadow .15s;
}
.input:focus, .select:focus, .textarea:focus {
  border-color: var(--brand-1);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--brand-1) 18%, transparent);
}
.input-mono { font-family: var(--font-mono); font-size: 13.5px; }
.hint { font-size: 12.5px; color: var(--text-3); }
.help { font-size: 13px; color: var(--text-3); margin-top: 4px; }
.checkbox-row { display: flex; align-items: center; gap: 10px; }

/* ------------ cards ------------ */
.card {
  background: var(--bg-1); border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  padding: var(--space-5);
}
.card-header {
  display: flex; align-items: center; gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.card-title { font-size: 16px; font-weight: 600; letter-spacing: -.01em; }
.card-sub   { color: var(--text-3); font-size: 13px; margin-top: 2px; }
.card-padded { padding: var(--space-6); }

/* ------------ tables ------------ */
.table {
  width: 100%; border-collapse: collapse; font-size: 14px;
}
.table th, .table td {
  text-align: left; padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.table th {
  font-weight: 500; color: var(--text-3); font-size: 12.5px;
  text-transform: uppercase; letter-spacing: .05em;
  background: var(--bg-2);
}
.table tr:hover td { background: color-mix(in oklab, var(--brand-1) 4%, transparent); }
.table-compact td, .table-compact th { padding: 7px 10px; }

/* ------------ chips / badges ------------ */
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11.5px; font-weight: 500;
  padding: 3px 8px; border-radius: 999px;
  background: var(--bg-2); color: var(--text-2);
  border: 1px solid var(--border);
}
.chip-brand   { background: color-mix(in oklab, var(--brand-1) 14%, transparent); color: var(--brand-1); border-color: color-mix(in oklab, var(--brand-1) 28%, transparent); }
.chip-success { background: color-mix(in oklab, var(--success) 14%, transparent); color: var(--success); border-color: color-mix(in oklab, var(--success) 28%, transparent); }
.chip-warn    { background: color-mix(in oklab, var(--warn) 14%, transparent); color: var(--warn); border-color: color-mix(in oklab, var(--warn) 28%, transparent); }
.chip-danger  { background: color-mix(in oklab, var(--danger) 14%, transparent); color: var(--danger); border-color: color-mix(in oklab, var(--danger) 28%, transparent); }

/* ------------ flash ------------ */
.flash {
  margin: var(--space-4) auto; max-width: 1180px;
  padding: 12px 16px; border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 14px;
}
.flash-success { background: color-mix(in oklab, var(--success) 10%, var(--bg-1)); border-color: color-mix(in oklab, var(--success) 30%, var(--border)); color: var(--success); }
.flash-error   { background: color-mix(in oklab, var(--danger) 10%, var(--bg-1));  border-color: color-mix(in oklab, var(--danger) 30%, var(--border));  color: var(--danger); }
.flash-info    { background: color-mix(in oklab, var(--info) 10%, var(--bg-1));    border-color: color-mix(in oklab, var(--info) 30%, var(--border));    color: var(--info); }

/* ------------ hero & marketing ------------ */
.hero {
  padding: var(--space-12) 0 var(--space-10);
  position: relative; overflow: hidden;
}
.hero h1 {
  font-size: clamp(36px, 6vw, 60px); line-height: 1.05;
  letter-spacing: -.025em; margin: 0 0 var(--space-4);
}
.hero .grad-text {
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead {
  font-size: 18.5px; color: var(--text-2); max-width: 640px;
  margin: 0 0 var(--space-6);
}
.hero-cta { display: flex; gap: var(--space-3); flex-wrap: wrap; }
.hero-bg {
  position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(circle at 20% 30%, color-mix(in oklab, var(--brand-1) 22%, transparent) 0%, transparent 50%),
    radial-gradient(circle at 85% 10%, color-mix(in oklab, var(--brand-2) 18%, transparent) 0%, transparent 55%);
}

.feature-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-5);
}
.feature {
  padding: var(--space-5); border-radius: var(--radius-lg);
  background: var(--bg-1); border: 1px solid var(--border);
}
.feature h3 { margin: 0 0 8px; font-size: 16px; }
.feature p  { margin: 0; font-size: 14px; color: var(--text-2); }
.feature-icon {
  width: 36px; height: 36px; border-radius: 10px;
  background: color-mix(in oklab, var(--brand-1) 12%, transparent);
  color: var(--brand-1);
  display: inline-flex; align-items: center; justify-content: center;
  margin-bottom: var(--space-3); font-size: 18px;
}

/* ------------ pricing ------------ */
.pricing-table { width: 100%; border-collapse: collapse; }
.pricing-table th, .pricing-table td { padding: 12px 16px; }
.pricing-table tbody tr {
  background: var(--bg-1); border: 1px solid var(--border);
}
.pricing-table tbody tr:hover { background: var(--bg-2); }
.pricing-table .model-name { font-weight: 600; }
.pricing-table .model-id { font-family: var(--font-mono); font-size: 12.5px; color: var(--text-3); }
.pricing-cap { font-family: var(--font-mono); font-size: 13px; }

/* ------------ dashboard layout ------------ */
.dash {
  display: grid; grid-template-columns: 220px 1fr;
  min-height: calc(100vh - 60px);
}
.dash-side {
  border-right: 1px solid var(--border);
  padding: var(--space-5) var(--space-3);
  background: var(--bg-1);
}
.dash-main { padding: var(--space-5); }
.dash-side a {
  display: block; padding: 8px 12px; color: var(--text-2);
  border-radius: 8px; font-size: 14px;
}
.dash-side a:hover { background: var(--bg-2); color: var(--text-1); text-decoration: none; }
.dash-side a.active { background: color-mix(in oklab, var(--brand-1) 12%, transparent); color: var(--brand-1); }
.dash-section { margin-bottom: var(--space-6); }
.dash-section h2 {
  font-size: 13.5px; text-transform: uppercase; letter-spacing: .06em;
  font-weight: 500; color: var(--text-3); margin: 0 0 var(--space-3);
}
@media (max-width: 900px) { .dash { grid-template-columns: 1fr; } .dash-side { border-right: none; border-bottom: 1px solid var(--border); } }

.stat-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
}
.stat {
  padding: var(--space-5); border-radius: var(--radius-lg);
  background: var(--bg-1); border: 1px solid var(--border);
}
.stat-label { font-size: 12px; color: var(--text-3); text-transform: uppercase; letter-spacing: .06em; }
.stat-value { font-size: 26px; font-weight: 600; letter-spacing: -.02em; margin-top: 4px; }
.stat-foot  { font-size: 12.5px; color: var(--text-3); margin-top: 6px; }

/* ------------ footer ------------ */
.footer {
  margin-top: var(--space-10);
  border-top: 1px solid var(--border);
  background: var(--bg-1);
  padding: var(--space-6) 0;
}
.footer-inner {
  display: flex; flex-wrap: wrap; gap: var(--space-5);
  max-width: 1180px; margin: 0 auto; padding: 0 var(--space-5);
  font-size: 13px; color: var(--text-3);
}
.footer a { color: var(--text-3); }
.footer a:hover { color: var(--text-1); }
.footer-col h4 { font-size: 13px; margin: 0 0 10px; color: var(--text-2); font-weight: 500; text-transform: uppercase; letter-spacing: .06em; }
.footer-col li { list-style: none; margin: 4px 0; padding: 0; }
.footer-col ul { margin: 0; padding: 0; }

/* ------------ code blocks ------------ */
pre.code, .code-block {
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 16px;
  font-size: 13px; line-height: 1.55; overflow-x: auto;
  color: var(--text-1);
}
code.inline {
  background: var(--bg-2); padding: 1px 6px; border-radius: 5px;
  font-size: .9em; color: var(--text-1); border: 1px solid var(--border);
}

/* ------------ misc ------------ */
.sep { height: 1px; background: var(--border); margin: var(--space-5) 0; border: none; }
hr.sep { border: none; height: 1px; background: var(--border); }
.copy-btn { font-size: 12px; padding: 4px 8px; background: var(--bg-2); border: 1px solid var(--border); border-radius: 6px; color: var(--text-2); cursor: pointer; }
.copy-btn:hover { background: var(--bg-3); }
.kbd { background: var(--bg-2); border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 5px; padding: 1px 6px; font-size: 12px; font-family: var(--font-mono); color: var(--text-2); }
.right { text-align: right; }
.nowrap { white-space: nowrap; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.h-30 { height: 30px; }

/* ------------ animation ------------ */
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.animate-fade { animation: fadeUp .35s ease both; }

/* ------------ small screens ------------ */
@media (max-width: 720px) {
  .nav-inner { gap: var(--space-3); }
  .nav-links { display: none; }
  .hero h1 { font-size: 36px; }
}

/* ───── i18n language switcher ───── */
.lang-switcher {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  margin-right: 8px;
  padding: 2px;
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 8px;
  background: var(--bg-2, #f8fafc);
  font-size: 12.5px;
  font-weight: 500;
  line-height: 1;
}
.lang-switcher .lang-cur,
.lang-switcher .lang-alt {
  padding: 5px 10px;
  border-radius: 6px;
  text-decoration: none;
  color: var(--text-2, #475569);
  transition: background-color 120ms;
}
.lang-switcher .lang-cur {
  background: var(--bg, #ffffff);
  color: var(--text, #0f172a);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}
.lang-switcher .lang-alt:hover {
  background: var(--bg, #ffffff);
  color: var(--text, #0f172a);
}