:root {
  --ink: #0f172a;
  --ink-soft: #334155;
  --muted: #64748b;
  --paper: #f1f5f9;
  --paper-2: #e2e8f0;
  --card: #ffffff;
  --line: #e2e8f0;
  --accent: #0d9488;
  --accent-deep: #0f766e;
  --accent-soft: rgba(13, 148, 136, 0.12);
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.06);
  --radius: 14px;
  --max: 1100px;
  --font: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --header-h: 3.5rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(ellipse 120% 80% at 100% -20%, rgba(13, 148, 136, 0.14), transparent 55%),
    radial-gradient(ellipse 80% 50% at 0% 0%, rgba(14, 165, 233, 0.08), transparent 50%),
    var(--paper);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--accent-deep); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }
.wrap { width: min(var(--max), calc(100% - 1.25rem)); margin-inline: auto; }
.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: #fff; padding: 0.65rem 1rem; border-radius: 8px;
}
.skip:focus { left: 1rem; top: 1rem; z-index: 30; }

/* Header + mobile nav */
.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 20;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 0.75rem; min-height: var(--header-h); padding: 0.5rem 0;
}
.brand {
  font-weight: 700; font-size: 1rem; color: var(--ink);
  text-decoration: none; letter-spacing: -0.02em; line-height: 1.2;
}
.brand span { color: var(--accent); }

.nav-toggle { position: relative; }
.nav-toggle summary {
  list-style: none; cursor: pointer;
  display: none; align-items: center; justify-content: center;
  min-width: 44px; min-height: 44px;
  border: 1px solid var(--line); border-radius: 10px;
  background: var(--card); font-weight: 600; font-size: 0.85rem;
}
.nav-toggle summary::-webkit-details-marker { display: none; }

nav.primary-nav { display: flex; flex-wrap: wrap; gap: 0.35rem 0.75rem; align-items: center; }
nav.primary-nav a {
  color: var(--ink-soft); text-decoration: none; font-size: 0.9rem; font-weight: 500;
  padding: 0.45rem 0.55rem; border-radius: 8px;
}
nav.primary-nav a:hover { color: var(--accent-deep); background: var(--accent-soft); }

@media (max-width: 820px) {
  .nav-toggle summary { display: inline-flex; }
  nav.primary-nav {
    display: none; position: absolute; right: 0; top: calc(100% + 0.5rem);
    flex-direction: column; align-items: stretch;
    min-width: min(280px, calc(100vw - 2rem));
    padding: 0.75rem; background: var(--card);
    border: 1px solid var(--line); border-radius: var(--radius);
    box-shadow: var(--shadow);
  }
  .nav-toggle[open] nav.primary-nav { display: flex; }
  nav.primary-nav a { padding: 0.75rem 0.85rem; }
}

/* Hero */
.hero {
  padding: 2.5rem 0 2rem;
}
.hero-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  padding: clamp(1.25rem, 4vw, 2.25rem);
}
.hero h1 {
  font-size: clamp(1.85rem, 6vw, 2.75rem);
  line-height: 1.12; letter-spacing: -0.03em; margin: 0 0 0.75rem;
  max-width: 18ch;
}
.hero .lede {
  font-size: clamp(1rem, 2.5vw, 1.12rem);
  color: var(--ink-soft); max-width: 42rem; margin: 0 0 1.35rem;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 0.65rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 0.65rem 1.15rem;
  border: 1px solid var(--accent-deep);
  background: var(--accent-deep); color: #fff; text-decoration: none;
  font-weight: 600; font-size: 0.95rem; border-radius: 10px;
  transition: background 0.15s, transform 0.15s;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-1px); }
.btn-ghost {
  background: var(--card); color: var(--ink); border-color: var(--line);
}
.btn-ghost:hover { background: var(--accent-soft); color: var(--accent-deep); border-color: transparent; }
.btn-sm { min-height: 38px; padding: 0.45rem 0.85rem; font-size: 0.85rem; }

.section { padding: 1.75rem 0 2rem; }
.section-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(1rem, 3vw, 1.5rem);
}
.section h2 {
  font-size: clamp(1.2rem, 3.5vw, 1.45rem);
  letter-spacing: -0.02em; margin: 0 0 0.35rem;
}
.section .sub { color: var(--muted); margin: 0 0 1rem; font-size: 0.95rem; }

/* Breadcrumbs */
.breadcrumbs {
  font-size: 0.82rem; color: var(--muted); margin: 0 0 1rem;
}
.breadcrumbs ol {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 0.35rem;
}
.breadcrumbs li:not(:last-child)::after {
  content: "›"; margin-left: 0.35rem; color: var(--paper-2);
}
.breadcrumbs a { color: var(--muted); text-decoration: none; }
.breadcrumbs a:hover { color: var(--accent); }

/* Tables — scroll on mobile + card fallback rows */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0 -0.25rem;
  padding: 0 0.25rem 0.5rem;
  border-radius: var(--radius);
}
.table-wrap::after {
  content: "Scroll →";
  display: none;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--muted);
  text-align: right;
  padding-top: 0.35rem;
}
@media (max-width: 640px) {
  .table-wrap.has-scroll::after { display: block; }
}

.matrix {
  width: 100%; min-width: 520px;
  border-collapse: collapse; font-size: 0.9rem;
}
.matrix th, .matrix td {
  border-bottom: 1px solid var(--line);
  padding: 0.75rem 0.65rem; text-align: left; vertical-align: top;
}
.matrix th {
  font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--muted); font-weight: 500;
  background: #f8fafc; position: sticky; top: 0;
}
.matrix td.num, .matrix th.num {
  text-align: right; font-variant-numeric: tabular-nums; font-family: var(--mono);
}
.matrix tbody tr:hover td { background: var(--accent-soft); }
.matrix tbody tr:last-child td { border-bottom: none; }

/* Link list as cards on mobile */
.list-links { list-style: none; padding: 0; margin: 0; }
.list-links li {
  border-bottom: 1px solid var(--line);
  padding: 0.9rem 0;
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 0.75rem; flex-wrap: wrap;
}
.list-links li:last-child { border-bottom: none; }
.list-links a {
  font-weight: 600; text-decoration: none; color: var(--ink);
  font-size: 1rem; line-height: 1.35;
}
.list-links a:hover { color: var(--accent); }
.meta {
  font-family: var(--mono); font-size: 0.75rem; color: var(--muted);
  line-height: 1.4; max-width: 100%;
}

@media (max-width: 640px) {
  .list-links li {
    flex-direction: column; gap: 0.35rem;
    padding: 1rem; margin-bottom: 0.5rem;
    border: 1px solid var(--line); border-radius: 12px;
    background: #f8fafc;
  }
  .list-links li:last-child { margin-bottom: 0; }
}

.prose { max-width: 44rem; }
.prose h1 {
  font-size: clamp(1.65rem, 5vw, 2.35rem);
  letter-spacing: -0.02em; margin: 0 0 0.75rem; line-height: 1.15;
}
.prose h2 { margin-top: 1.75rem; font-size: 1.2rem; }
.prose p, .prose li { color: var(--ink-soft); }
.kicker {
  font-family: var(--mono); font-size: 0.75rem; text-transform: uppercase;
  letter-spacing: 0.07em; color: var(--accent); margin: 0 0 0.5rem; font-weight: 500;
}

.split {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
}
@media (max-width: 760px) {
  .split { grid-template-columns: 1fr; }
}

.panel {
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem;
}
.panel h3 { margin: 0 0 0.5rem; font-size: 1.1rem; }
.panel p { margin: 0 0 0.65rem; color: var(--ink-soft); font-size: 0.95rem; }
.panel p:last-child { margin-bottom: 0; }

.verdict {
  background: linear-gradient(135deg, var(--accent-soft), rgba(255,255,255,0.6));
  border: 1px solid rgba(13, 148, 136, 0.25);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  margin: 1rem 0 1.25rem;
}
.verdict p { margin: 0; color: var(--ink); font-size: 1.02rem; line-height: 1.55; }

.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  background: var(--card);
  padding: 2rem 0 2.5rem;
  padding-bottom: max(2.5rem, env(safe-area-inset-bottom));
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 1.25rem;
}
.footer-grid a {
  display: block; color: var(--ink-soft); text-decoration: none;
  margin: 0.3rem 0; font-size: 0.9rem; padding: 0.15rem 0;
}
.footer-grid a:hover { color: var(--accent); }
.footer-label {
  font-family: var(--mono); font-size: 0.7rem; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--muted); margin: 0 0 0.5rem;
}
.disclosure {
  margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--line);
  font-size: 0.85rem; color: var(--muted); line-height: 1.5;
}
.muted { color: var(--muted); }
.updated { font-family: var(--mono); font-size: 0.78rem; color: var(--muted); }

@media (max-width: 760px) {
  .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .hero { padding-top: 1.5rem; }
  .section { padding: 1.25rem 0 1.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn:hover { transform: none; }
}