:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --fg: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --accent: #1d4ed8;
  --accent-soft: #eef3ff;
  --code-bg: #f1f5f9;
  --max: 980px;
  --measure: 760px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.07);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.7 "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(29, 78, 216, 0.16); }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.header-left { display: flex; align-items: center; gap: 12px; }
.brand { font-weight: 700; font-size: 20px; letter-spacing: -0.02em; color: var(--fg); }
.brand:hover { text-decoration: none; }
.brand span { color: var(--accent); }
.brand-tag {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 3px 8px;
}
.nav { display: flex; align-items: center; gap: 24px; }
.nav a { color: var(--muted); font-size: 12.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; }
.nav a:hover { color: var(--accent); text-decoration: none; }
.nav a.nav-cta {
  color: #fff;
  background: var(--accent);
  border-radius: 8px;
  padding: 7px 13px;
  box-shadow: var(--shadow-sm);
}
.nav a.nav-cta:hover { background: #1a43b8; color: #fff; }

main { padding: 44px 0 72px; }

h1 { font-size: 36px; line-height: 1.18; letter-spacing: -0.028em; margin: 0 0 12px; font-weight: 700; }
h2 { font-size: 22px; margin: 38px 0 12px; letter-spacing: -0.02em; font-weight: 650; }
h3 { font-size: 18px; margin: 28px 0 8px; font-weight: 650; }

.eyebrow {
  margin: 0 0 12px;
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.lede { color: var(--muted); font-size: 18px; margin: 0 0 26px; max-width: 620px; }

.hero { padding: 8px 0 0; max-width: 780px; }
.hero h1 { font-size: 46px; }
.hero .search-hint { max-width: 560px; }

.quick-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.quick-links a {
  font-size: 13px;
  font-weight: 600;
  color: var(--fg);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 13px;
  text-decoration: none;
  transition: border-color 0.15s, color 0.15s, box-shadow 0.15s;
}
.quick-links a:hover { border-color: var(--accent); color: var(--accent); box-shadow: var(--shadow-sm); text-decoration: none; }

.section { margin-top: 52px; }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--fg);
}
.section-head h2 { margin: 0; font-size: 20px; }
.section-head a { font-size: 13.5px; font-weight: 600; white-space: nowrap; }

.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card-grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}
.card:hover { border-color: var(--line-strong); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.card-os { font-size: 11.5px; font-weight: 600; color: var(--muted); }
.card h3 { margin: 0; font-size: 16.5px; line-height: 1.4; }
.card h3 a { color: var(--fg); }
.card h3 a:hover { color: var(--accent); text-decoration: none; }
.card p { margin: 8px 0 0; font-size: 14px; color: var(--muted); line-height: 1.6; }
.card-meta { margin-top: 14px; font-size: 12px; color: var(--muted); }
.card-tool { border-top: 3px solid var(--accent); }

.badge {
  display: inline-block;
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--code-bg);
  color: var(--muted);
}
.badge-high { background: #fee4e2; color: #b42318; }
.badge-medium { background: #fef0c7; color: #93370d; }
.badge-low { background: #dcfae6; color: #067647; }
.badge-tool { background: var(--accent-soft); color: var(--accent); }

.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li { padding: 18px 0; border-bottom: 1px solid var(--line); }
.post-list a { font-size: 18px; font-weight: 650; color: var(--fg); }
.post-list a:hover { color: var(--accent); }
.post-list p { margin: 6px 0 0; color: var(--muted); font-size: 15px; }

.meta { margin-top: 10px; font-size: 13px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.chip { background: var(--code-bg); border-radius: 4px; padding: 2px 8px; font-size: 12px; font-weight: 600; color: var(--muted); }
.chip-high { background: #fee4e2; color: #b42318; }
.chip-medium { background: #fef0c7; color: #93370d; }

.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; font-size: 13px; color: var(--muted); margin-bottom: 16px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { color: var(--line-strong); }

.page-head { margin-bottom: 20px; }
.page-head .lede { margin-bottom: 0; }

.post-head { margin-bottom: 26px; max-width: var(--measure); }

.error-box {
  background: #0f1a33;
  color: #cfe0ff;
  border-left: 3px solid var(--accent);
  padding: 16px 18px;
  border-radius: 10px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.65;
  margin: 0 0 26px;
  max-width: var(--measure);
}
.error-box code { background: none; color: inherit; padding: 0; }

.toc {
  max-width: var(--measure);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 18px;
  margin: 0 0 28px;
  box-shadow: var(--shadow-sm);
}
.toc summary { cursor: pointer; font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); }
.toc summary:hover { color: var(--accent); }
.toc ul { margin: 10px 0 0; padding-left: 18px; }
.toc li { margin: 5px 0; font-size: 14.5px; }
.toc a { color: var(--fg); }
.toc a:hover { color: var(--accent); }

.content { max-width: var(--measure); }
.content p { margin: 0 0 18px; }
.content ul, .content ol { margin: 0 0 18px; padding-left: 24px; }
.content li { margin: 6px 0; }
.content h2 { border-left: 3px solid var(--accent); padding-left: 12px; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 2px 5px;
  border-radius: 4px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  padding: 14px 16px;
  border-radius: 10px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.6;
}
pre code { background: none; padding: 0; }

table { border-collapse: collapse; width: 100%; margin: 0 0 20px; font-size: 15px; }
th, td { text-align: left; border-bottom: 1px solid var(--line); padding: 8px 10px; }
th { background: var(--code-bg); font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
tbody tr:hover { background: #fbfcfe; }

.search-hint input {
  width: 100%;
  padding: 13px 15px;
  font-size: 16px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--surface);
  color: var(--fg);
  box-shadow: var(--shadow-sm);
}
.search-hint input::placeholder { color: #94a3b8; }
.search-hint input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px rgba(29, 78, 216, 0.1); }
.search-results {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.search-results li { border-bottom: 1px solid var(--line); }
.search-results li:last-child { border-bottom: 0; }
.search-results a { display: block; padding: 11px 15px; color: var(--fg); }
.search-results a:hover { background: var(--accent-soft); color: var(--accent); text-decoration: none; }

.tool {
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: 14px;
  padding: 22px;
  margin: 0 0 28px;
  box-shadow: var(--shadow-sm);
  max-width: var(--measure);
}
.tool-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.tool-row label { display: flex; flex-direction: column; font-size: 11.5px; font-weight: 700; color: var(--muted); gap: 4px; text-transform: uppercase; letter-spacing: 0.05em; }
.tool-row input { padding: 9px 11px; border: 1px solid var(--line-strong); border-radius: 8px; font-family: ui-monospace, monospace; font-size: 14px; background: var(--surface); color: var(--fg); }
.tool-row input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.1); }
.tool-presets { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.tool-presets button { padding: 6px 11px; font-size: 13px; font-weight: 600; border: 1px solid var(--line-strong); background: var(--surface); color: var(--muted); border-radius: 999px; cursor: pointer; }
.tool-presets button:hover { border-color: var(--accent); color: var(--accent); }
.tool-presets button.active { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.tool-out { font-size: 15px; }
.tool-note { color: var(--accent); font-size: 14px; min-height: 20px; margin: 8px 0 0; }
.tool-h2 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); border: 0; margin: 20px 0 8px; }
.tool-runs { margin: 0; padding-left: 20px; font-family: ui-monospace, monospace; font-size: 13.5px; }

.recommend { margin-top: 52px; max-width: var(--max); }
.recommend h2 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin: 0 0 16px; }

.site-footer { background: var(--surface); border-top: 1px solid var(--line); margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 32px; padding: 40px 0 24px; }
.footer-brand p { margin: 10px 0 0; color: var(--muted); font-size: 14px; max-width: 320px; }
.footer-col h4 { margin: 0 0 12px; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
.footer-col a { display: block; font-size: 14px; color: var(--fg); margin-bottom: 8px; }
.footer-col a:hover { color: var(--accent); }
.footer-bar { border-top: 1px solid var(--line); padding: 18px 0 32px; }
.footer-bar p { margin: 0; font-size: 12.5px; color: var(--muted); }

@media (max-width: 900px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  h1, .hero h1 { font-size: 30px; }
  .tool-row { grid-template-columns: repeat(2, 1fr); }
  body { font-size: 16px; }
  .nav { gap: 14px; }
  .nav a { font-size: 11.5px; }
  .brand-tag { display: none; }
  .card-grid, .card-grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; padding: 32px 0 20px; }
}

.tool-row-3 { grid-template-columns: repeat(3, 1fr); }
.tool-row select, .tool-row input { padding: 9px 11px; border: 1px solid var(--line-strong); border-radius: 8px; font-size: 14px; background: var(--surface); color: var(--fg); }
.tool-code { background: #0f1a33; color: #dbe7ff; padding: 14px 16px; border-radius: 10px; overflow-x: auto; font-size: 13px; margin: 14px 0; }
.tool-code code { background: none; color: inherit; padding: 0; }
@media (max-width: 640px) { .tool-row-3 { grid-template-columns: 1fr; } }