/* ==========================================================================
   bug.icu — design system (v2, applied from Ardot "bug.icu 官网首页")
   Theme: dark "debugging terminal" ink + coral accent, light content bands.
   Fonts: Space Grotesk (display) / Inter (body) / JetBrains Mono (code).
   ========================================================================== */

:root {
  --ink: #0E0E11;
  --ink-2: #16161A;
  --ink-3: #1A1413;          /* badge / warm dark */
  --ink-soft: #1C1C20;       /* secondary dark surface */
  --white: #FFFFFF;
  --bg-soft: #FAFAF9;
  --card: #FFFFFF;

  --text: #18181B;
  --text-soft: #71717A;
  --text-dim: #A1A1AA;

  --on-dark: #F5F5F4;
  --on-dark-soft: #A1A1AA;
  --on-dark-dim: #71717A;

  --accent: #E8635A;         /* bug coral */
  --accent-soft: #E8A99F;
  --green: #7DD3A8;          /* terminal success */

  --border: #E9E9E1;         /* light border */
  --border-dark: rgba(255, 255, 255, 0.08);

  --radius: 12px;
  --radius-lg: 16px;

  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "Space Grotesk", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
section { scroll-margin-top: 80px; }

/* --------------------------------------------------------------------------
   Header (dark, sticky)
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--ink);
  border-bottom: 1px solid var(--border-dark);
}
.site-header .inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  height: 72px; display: flex; align-items: center; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--display); font-weight: 700; font-size: 20px; color: var(--on-dark); letter-spacing: -0.3px; }
.brand .bug { width: 26px; height: 26px; flex: none; }
.brand .dot { color: var(--accent); }
.nav { display: flex; gap: 28px; margin-left: auto; align-items: center; }
.nav a { color: var(--on-dark-soft); font-size: 15px; font-weight: 500; }
.nav a:hover { color: var(--on-dark); text-decoration: none; }
.search-box { position: relative; }
.search-box input {
  width: 210px; padding: 9px 14px; border: 1px solid var(--border-dark);
  border-radius: 999px; font-size: 14px; outline: none;
  background: var(--ink-2); color: var(--on-dark);
}
.search-box input::placeholder { color: var(--on-dark-dim); }
.search-box input:focus { border-color: var(--accent); }
.search-results {
  position: absolute; top: 46px; left: 0; right: 0; background: var(--ink-2);
  border: 1px solid var(--border-dark); border-radius: 10px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.4); overflow: hidden; display: none; z-index: 60;
}
.search-results a { display: block; padding: 10px 14px; font-size: 14px; color: var(--on-dark); }
.search-results a:hover { background: rgba(232,99,90,0.14); text-decoration: none; }
.search-results .empty { padding: 10px 14px; color: var(--on-dark-dim); font-size: 13px; }

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-block; padding: 14px 28px; border-radius: 10px; font-weight: 600;
  font-size: 16px; background: var(--accent); color: var(--ink);
  border: 1px solid transparent; transition: opacity .12s ease, transform .12s ease;
}
.btn:hover { text-decoration: none; opacity: 0.92; }
.btn-ghost { background: var(--ink-soft); color: var(--on-dark); border: 1px solid rgba(255,255,255,0.18); }
.btn-ghost:hover { opacity: 0.85; }

/* --------------------------------------------------------------------------
   Hero (dark split: content + terminal)
   -------------------------------------------------------------------------- */
.hero { background: var(--ink); color: var(--on-dark); padding: 88px 0; }
.hero .container { display: flex; gap: 48px; align-items: center; }
.hero-left { flex: 1 1 560px; min-width: 0; }
.badge {
  display: inline-flex; align-items: center; gap: 8px; padding: 7px 14px;
  border-radius: 999px; background: var(--ink-3);
  border: 1px solid rgba(232,99,90,0.5);
  font-family: var(--mono); font-size: 13px; color: var(--accent-soft);
}
.badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); flex: none; }
.hero h1 {
  font-family: var(--display); font-weight: 700; font-size: 52px; line-height: 1.15;
  letter-spacing: -1px; margin: 24px 0 16px; color: var(--on-dark);
}
.hero p.lead { font-size: 18px; line-height: 1.6; color: var(--on-dark-soft); margin: 0 0 28px; max-width: 560px; }
.cta-row { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.trust-line { font-family: var(--mono); font-size: 13px; color: var(--on-dark-dim); margin-top: 22px; }

.hero-visual { flex: 1 1 480px; min-width: 0; }
.terminal {
  background: var(--ink-2); border: 1px solid var(--border-dark); border-radius: 12px;
  padding: 20px; font-family: var(--mono);
}
.term-bar { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.term-bar .tdot { width: 12px; height: 12px; border-radius: 50%; flex: none; }
.term-bar .tdot.r { background: #FF5F56; }
.term-bar .tdot.y { background: #FFBD2E; }
.term-bar .tdot.g { background: #27C93F; }
.term-bar .ttitle { margin-left: 8px; font-size: 12px; color: var(--on-dark-dim); }
.term-line { font-size: 13px; line-height: 1.75; white-space: pre-wrap; word-break: break-word; }
.term-line.cmd { color: var(--accent); }
.term-line.cause { color: var(--on-dark-soft); }
.term-line.fix { color: var(--green); }
.term-line.more { color: var(--on-dark); }

/* --------------------------------------------------------------------------
   Section heads (shared)
   -------------------------------------------------------------------------- */
.section { padding: 80px 0; }
.section-head { max-width: 1200px; margin: 0 auto 40px; padding: 0 24px; }
.sec-label { font-family: var(--mono); font-size: 14px; color: var(--accent); letter-spacing: 0.5px; }
.sec-title { font-family: var(--display); font-weight: 700; font-size: 36px; letter-spacing: -0.5px; margin: 12px 0 8px; color: var(--text); }
.sec-sub { font-size: 16px; color: var(--text-soft); margin: 0; }

/* --------------------------------------------------------------------------
   Toolbox — bento grid
   -------------------------------------------------------------------------- */
.tools { background: var(--white); }
.tool-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
}
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 24px; display: flex; flex-direction: column; gap: 10px;
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s;
}
.card:hover {
  transform: translateY(-2px); text-decoration: none;
  box-shadow: 0 10px 30px rgba(0,0,0,0.07); border-color: #d7dae0;
}
.card .ico { width: 38px; height: 38px; flex: none; }
.card h3 { font-size: 17px; color: var(--text); margin: 4px 0 0; font-weight: 600; }
.card p { font-size: 13px; color: var(--text-soft); margin: 0; }

.card.feature { grid-column: span 2; border-color: rgba(232,99,90,0.55); box-shadow: 0 8px 24px rgba(232,99,90,0.10); }
.card.feature .preview {
  margin-top: 6px; background: var(--ink); border-radius: 10px; padding: 12px;
  font-family: var(--mono); font-size: 12px; line-height: 1.6; color: var(--green);
  overflow-x: auto;
}

/* --------------------------------------------------------------------------
   Error library preview
   -------------------------------------------------------------------------- */
.library { background: var(--bg-soft); }
.search-bar {
  display: flex; align-items: center; gap: 12px; max-width: 1200px; margin: 0 auto;
  height: 64px; padding: 0 24px; border-radius: 999px; background: var(--white);
  border: 1px solid var(--border);
  box-shadow: 0 8px 24px rgba(0,0,0,0.05);
}
.search-bar .sicon { width: 22px; height: 22px; flex: none; color: var(--text-soft); }
.search-bar input {
  flex: 1; border: none; outline: none; background: transparent;
  font-family: var(--mono); font-size: 15px; color: var(--text);
}
.search-bar input::placeholder { color: var(--text-soft); }
.chips { display: flex; flex-wrap: wrap; gap: 12px; max-width: 1200px; margin: 24px auto 0; padding: 0 24px; }
.chip {
  padding: 8px 16px; border-radius: 999px; background: var(--white);
  border: 1px solid var(--border); font-size: 14px; color: var(--text); cursor: default;
}
.chip.mono { font-family: var(--mono); font-size: 14px; }
.err-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; max-width: 1200px; margin: 24px auto 0; padding: 0 24px; }
.err-card {
  background: var(--white); border: 1px solid var(--border); border-radius: 14px;
  padding: 20px; display: flex; flex-direction: column; gap: 8px; text-decoration: none;
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s;
}
.err-card:hover { transform: translateY(-2px); text-decoration: none; box-shadow: 0 10px 30px rgba(0,0,0,0.06); border-color: #d7dae0; }
.err-card .tag { font-family: var(--mono); font-size: 12px; color: var(--accent); }
.err-card h3 { font-size: 15px; color: var(--text); margin: 0; font-weight: 600; }
.err-card p { font-size: 13px; color: var(--text-soft); margin: 0; }
.err-card .link { font-family: var(--mono); font-size: 13px; color: var(--accent); margin-top: auto; }

/* --------------------------------------------------------------------------
   Stats band (dark)
   -------------------------------------------------------------------------- */
.stats { background: var(--ink); color: var(--on-dark); text-align: center; padding: 64px 0; }
.stats h2 { font-family: var(--display); font-weight: 700; font-size: 28px; margin: 0 0 36px; color: var(--on-dark); }
.stats-row { display: flex; justify-content: space-between; max-width: 1136px; margin: 0 auto; padding: 0 24px; gap: 16px; }
.stat { flex: 1; display: flex; flex-direction: column; gap: 8px; align-items: center; }
.stat .num { font-family: var(--display); font-weight: 700; font-size: 44px; color: var(--accent); line-height: 1; }
.stat .lbl { font-size: 14px; color: var(--on-dark-soft); }

/* --------------------------------------------------------------------------
   Final CTA (coral)
   -------------------------------------------------------------------------- */
.cta { background: var(--accent); text-align: center; padding: 96px 24px; display: flex; flex-direction: column; align-items: center; gap: 24px; }
.cta h2 { font-family: var(--display); font-weight: 700; font-size: 40px; color: var(--ink); max-width: 760px; margin: 0; letter-spacing: -0.5px; }
.cta p { font-size: 18px; color: #2A1410; max-width: 620px; margin: 0; }
.cta .btn { background: var(--ink); color: var(--on-dark); }
.cta .btn:hover { opacity: 0.9; }

/* --------------------------------------------------------------------------
   Footer (dark)
   -------------------------------------------------------------------------- */
.site-footer { background: var(--ink); color: var(--on-dark-soft); padding: 64px 0 36px; border-top: 1px solid var(--border-dark); }
.site-footer .inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.footer-top { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.footer-brand { max-width: 300px; }
.footer-logo { display: flex; align-items: center; gap: 10px; font-family: var(--display); font-weight: 700; font-size: 20px; color: var(--on-dark); }
.footer-logo .bug { width: 24px; height: 24px; flex: none; }
.footer-tag { font-size: 14px; color: var(--on-dark-soft); margin: 14px 0 0; }
.footer-cols { display: flex; gap: 64px; flex-wrap: wrap; }
.footer-col { display: flex; flex-direction: column; gap: 12px; }
.footer-col h4 { font-size: 14px; color: var(--on-dark); margin: 0 0 2px; font-weight: 600; }
.footer-col a { font-size: 13px; color: var(--on-dark-soft); }
.footer-col a:hover { color: var(--accent); text-decoration: none; }
.bottom-bar { display: flex; justify-content: space-between; align-items: center; gap: 16px; border-top: 1px solid var(--border-dark); margin-top: 40px; padding-top: 24px; font-size: 13px; color: var(--on-dark-dim); flex-wrap: wrap; }

/* --------------------------------------------------------------------------
   Tool pages (preserved)
   -------------------------------------------------------------------------- */
.tool-wrap { max-width: 860px; margin: 0 auto; padding: 32px 24px 64px; }
.tool-wrap h1 { font-size: 28px; margin: 0 0 6px; color: var(--text); }
.tool-wrap .lead { color: var(--text-soft); margin: 0 0 24px; }
.panel { border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; background: var(--card); }
label { display: block; font-size: 13px; font-weight: 700; margin: 0 0 6px; color: var(--text-soft); }
textarea, input[type=text], input[type=number], input[type=search], select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px;
  font-family: var(--mono); font-size: 14px; outline: none; background: var(--bg-soft); color: var(--text);
}
textarea:focus, input:focus, select:focus { border-color: var(--accent); background: #fff; }
textarea { min-height: 120px; resize: vertical; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.row-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 640px){ .row, .row-3 { grid-template-columns: 1fr; } }
button.action {
  margin-top: 12px; padding: 9px 16px; border: none; border-radius: 8px; background: var(--accent);
  color: var(--ink); font-weight: 700; cursor: pointer; font-size: 14px;
}
button.action:hover { opacity: .92; }
button.secondary { background: var(--bg-soft); color: var(--text); border: 1px solid var(--border); }
pre.output {
  margin: 12px 0 0; padding: 14px; background: var(--ink); color: #e2e8f0; border-radius: 8px;
  font-family: var(--mono); font-size: 13px; white-space: pre-wrap; word-break: break-word; max-height: 360px; overflow: auto;
}
.hint { font-size: 12px; color: var(--text-soft); margin-top: 6px; }
.badge { /* tool-page inline tag */ display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 999px; background: rgba(232,99,90,0.12); color: var(--accent); font-weight: 700; margin-left: 8px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--text-soft); font-size: 12px; text-transform: uppercase; letter-spacing: .5px; }

/* Error library list (errors/index.html) */
.error-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
.error-item { border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; text-decoration: none; transition: border-color .12s, box-shadow .12s; }
.error-item:hover { border-color: #d7dae0; box-shadow: 0 8px 24px rgba(0,0,0,0.05); text-decoration: none; }
.error-item code { font-family: var(--mono); color: var(--accent); font-size: 14px; }
.error-item p { margin: 6px 0 0; font-size: 13px; color: var(--text-soft); }

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 980px) {
  .hero .container { flex-direction: column; align-items: stretch; }
  .hero h1 { font-size: 40px; }
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
  .card.feature { grid-column: span 2; }
  .err-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-row { flex-wrap: wrap; gap: 24px; }
  .stat { flex: 1 1 40%; }
}
@media (max-width: 640px) {
  .nav { display: none; }
  .search-box { margin-left: auto; }
  .hero { padding: 56px 0; }
  .hero h1 { font-size: 32px; }
  .section { padding: 56px 0; }
  .sec-title { font-size: 28px; }
  .tool-grid { grid-template-columns: 1fr; }
  .card.feature { grid-column: span 1; }
  .err-grid { grid-template-columns: 1fr; }
  .cta h2 { font-size: 30px; }
  .footer-cols { gap: 32px; }
}