/* =========================================================================
   A Field Guide to AI Agent Sandboxes — design system
   Dark "control room" theme. Family accents carry the meaning; ratings are
   colour-coded and always paired with words.
   ========================================================================= */

:root {
  /* surfaces */
  --ink: #070a13;
  --ink-2: #0b1020;
  --panel: #111832;
  --panel-2: #16203f;
  --panel-3: #1d2850;
  --line: #26315a;
  --line-soft: #1b2444;

  /* text */
  --text: #e9eefc;
  --text-soft: #b9c4e2;
  --text-dim: #8391b8;

  /* accents */
  --accent: #7dd3fc;
  --accent-2: #f0abfc;
  --accent-3: #fde68a;

  /* isolation families */
  --f-process: #f5a524;
  --f-container: #2dd4bf;
  --f-microvm: #a78bfa;
  --f-vm: #fb7185;
  --f-appkernel: #38bdf8;
  --f-wasm: #a3e635;
  --f-agent: #f472b6;
  --f-orchestrator: #e879f9;
  --f-computeruse: #fb923c;
  --f-secrets: #34d399;
  --f-network: #22d3ee;
  --f-policy: #fbbf24;
  --f-cloud: #818cf8;
  --f-windows: #60a5fa;
  --f-filesystem: #c084fc;
  --f-list: #94a3b8;
  --f-adjacent: #64748b;

  /* ratings */
  --r-mature: #34d399;
  --r-test: #fbbf24;
  --r-early: #fb923c;
  --r-study: #60a5fa;
  --r-skip: #f87171;
  --r-notsandbox: #94a3b8;

  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 18px 40px -24px rgba(0, 0, 0, 0.9);
  --maxw: 1180px;

  --font-display: "Space Grotesk", "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* Reader-selectable palettes. Aurora preserves the original control-room
   atmosphere; the others adjust both surface contrast and typography. */
:root[data-theme="paper"] {
  color-scheme: light;
  --ink: #f4f0e7;
  --ink-2: #eae4d8;
  --panel: #fffdf8;
  --panel-2: #f6f0e5;
  --panel-3: #e7dece;
  --line: #cbbfae;
  --line-soft: #dbd1c2;
  --text: #22242c;
  --text-soft: #50535c;
  --text-dim: #71716e;
  --accent: #0c657d;
  --accent-2: #814b89;
  --accent-3: #8a570c;
  --shadow: 0 18px 38px -28px rgba(61, 47, 27, 0.55);
  --font-display: "Playfair Display", Georgia, serif;
  --font-body: "DM Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "DM Mono", ui-monospace, monospace;
}

:root[data-theme="signal"] {
  --ink: #0b0a14;
  --ink-2: #111020;
  --panel: #17152a;
  --panel-2: #211e38;
  --panel-3: #2b2745;
  --line: #48415e;
  --line-soft: #302c46;
  --text: #f4f0ff;
  --text-soft: #c8c1d9;
  --text-dim: #9990b2;
  --accent: #77e6e2;
  --accent-2: #e699d0;
  --accent-3: #f2c879;
  --font-display: "Playfair Display", Georgia, serif;
  --font-body: "DM Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "DM Mono", ui-monospace, monospace;
}

:root[data-theme="terminal"] {
  --ink: #07110b;
  --ink-2: #0a1710;
  --panel: #0e2017;
  --panel-2: #142d20;
  --panel-3: #1c3d2a;
  --line: #28563a;
  --line-soft: #1c402c;
  --text: #d9f7df;
  --text-soft: #a5d6b1;
  --text-dim: #77a985;
  --accent: #75f4a5;
  --accent-2: #68d9ff;
  --accent-3: #f0d36e;
  --font-display: "DM Mono", "JetBrains Mono", ui-monospace, monospace;
  --font-body: "DM Mono", "JetBrains Mono", ui-monospace, monospace;
  --font-mono: "DM Mono", "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(1200px 600px at 12% -10%, rgba(125, 211, 252, 0.13), transparent 60%),
    radial-gradient(900px 500px at 92% 4%, rgba(240, 171, 252, 0.12), transparent 55%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 55%, var(--ink) 100%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

:root[data-theme="paper"] body {
  background: radial-gradient(1000px 600px at 6% -10%, rgba(12,101,125,.10), transparent 58%),
    radial-gradient(900px 500px at 96% 0%, rgba(129,75,137,.10), transparent 56%),
    linear-gradient(180deg, var(--ink), var(--ink-2) 58%, var(--ink));
}
:root[data-theme="signal"] body {
  background: radial-gradient(1000px 580px at 6% -10%, rgba(119,230,226,.12), transparent 58%),
    radial-gradient(850px 500px at 96% 0%, rgba(230,153,208,.12), transparent 55%),
    linear-gradient(180deg, var(--ink), var(--ink-2) 58%, var(--ink));
}
:root[data-theme="terminal"] body {
  background: radial-gradient(950px 580px at 8% -10%, rgba(117,244,165,.10), transparent 58%),
    linear-gradient(180deg, var(--ink), var(--ink-2) 58%, var(--ink));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(120, 145, 210, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 145, 210, 0.07) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle at 50% 0%, rgba(0,0,0,0.9), transparent 85%);
  z-index: 0;
}

main, header, footer, .prev-next { position: relative; z-index: 1; }

.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--panel-3);
  color: var(--text); padding: 0.6rem 1rem; border-radius: 0 0 10px 0; z-index: 99;
}
.skip-link:focus { left: 0; }

/* ---------------------------------------------------------------- typography */
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.12; letter-spacing: -0.015em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); margin: 0 0 0.6rem; }
h2 { font-size: clamp(1.5rem, 3vw, 2.05rem); margin: 3rem 0 0.8rem; }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); margin: 2rem 0 0.5rem; }
h4 { font-size: 1.02rem; margin: 1.4rem 0 0.4rem; letter-spacing: 0.02em; text-transform: uppercase; color: var(--text-dim); }
p { margin: 0 0 1.05rem; }
dd, td, .blurb, .lwhy { overflow-wrap: anywhere; }
a { color: var(--accent); text-decoration-color: rgba(125, 211, 252, 0.4); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--accent); }
strong { color: var(--text); font-weight: 600; }
em { color: var(--accent-3); font-style: italic; }
small { font-size: 0.85rem; }
code, kbd, samp { font-family: var(--font-mono); font-size: 0.88em; }
p code, li code, td code, th code {
  background: rgba(125, 211, 252, 0.1);
  border: 1px solid rgba(125, 211, 252, 0.18);
  border-radius: 5px;
  padding: 0.08em 0.35em;
  color: #cdeaff;
}
hr { border: 0; border-top: 1px solid var(--line); margin: 2.4rem 0; }
ul, ol { margin: 0 0 1.1rem; padding-left: 1.25rem; }
li { margin: 0.3rem 0; }
li > ul, li > ol { margin: 0.35rem 0 0.45rem; }
blockquote {
  margin: 1.4rem 0; padding: 0.85rem 1.1rem;
  border-left: 3px solid var(--accent-2);
  background: rgba(240, 171, 252, 0.07);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-soft);
}
blockquote p:last-child { margin-bottom: 0; }

.wrap { width: min(100% - 2.4rem, var(--maxw)); margin-inline: auto; }

/* -------------------------------------------------------------------- header */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(9, 13, 26, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.header-inner {
  width: min(100% - 2rem, 1400px); margin-inline: auto;
  display: flex; align-items: center; gap: 1.2rem;
  padding: 0.55rem 0;
  flex-wrap: wrap;
}
.theme-control { margin-left: auto; flex: 0 0 auto; }
.theme-control select {
  appearance: none; border: 1px solid var(--line); border-radius: 999px;
  padding: 0.34rem 1.9rem 0.34rem 0.75rem; color: var(--text-soft);
  background: var(--panel-2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2393a4c8' d='m1 1 5 5 5-5 1 1-6 6L0 2z'/%3E%3C/svg%3E") no-repeat right 0.66rem center;
  font: 500 0.72rem var(--font-mono); letter-spacing: .04em; text-transform: uppercase;
  cursor: pointer;
}
.theme-control select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.brand { display: flex; align-items: center; gap: 0.65rem; text-decoration: none; color: var(--text); flex: 0 0 auto; }
.brand-mark { display: grid; place-items: center; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-family: var(--font-display); font-size: 0.98rem; letter-spacing: -0.01em; }
.brand-text small { color: var(--text-dim); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; }

.site-nav { display: flex; flex-wrap: wrap; gap: 0.4rem 1.15rem; align-items: center; flex: 1 1 auto; }
.nav-group { display: flex; align-items: center; gap: 0.5rem; }
.nav-group-label {
  font-size: 0.63rem; letter-spacing: 0.13em; text-transform: uppercase;
  color: var(--text-dim); white-space: nowrap;
  border-left: 2px solid var(--line); padding-left: 0.5rem;
}
.nav-group:first-child .nav-group-label { border-left: 0; padding-left: 0; }
.nav-links { display: flex; flex-wrap: wrap; gap: 0.15rem; }
.nav-links a {
  font-size: 0.83rem; padding: 0.28rem 0.5rem; border-radius: 7px;
  color: var(--text-soft); text-decoration: none; white-space: nowrap;
}
.nav-links a:hover { background: var(--panel-2); color: #fff; }
.nav-links a.active { background: linear-gradient(135deg, rgba(125,211,252,0.22), rgba(240,171,252,0.18)); color: #fff; box-shadow: inset 0 0 0 1px rgba(125,211,252,0.35); }
.nav-toggle {
  display: none; font-family: var(--font-display); font-size: 0.85rem;
  background: var(--panel-2); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 0.4rem 0.7rem; cursor: pointer;
}

/* ----------------------------------------------------------------- hero/page */
.page-head { padding: 3.4rem 0 1.4rem; }
.page-head .eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent);
  border: 1px solid rgba(125, 211, 252, 0.3); border-radius: 999px;
  padding: 0.22rem 0.7rem; margin-bottom: 1rem;
  background: rgba(125, 211, 252, 0.07);
}
.page-head .lede { font-size: 1.12rem; color: var(--text-soft); max-width: 62ch; }
.section { padding: 1rem 0 2.4rem; }

.hero { padding: 3rem 0 2rem; display: grid; gap: 2.2rem; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 2.4rem; align-items: center; }
.hero h1 { font-size: clamp(2.4rem, 6vw, 4rem); }
.hero .lede { font-size: 1.2rem; color: var(--text-soft); max-width: 54ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.4rem; }

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-display); font-size: 0.95rem; font-weight: 500;
  padding: 0.62rem 1.1rem; border-radius: 10px; text-decoration: none;
  border: 1px solid var(--line); color: var(--text); background: var(--panel);
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}
.btn:hover { transform: translateY(-1px); background: var(--panel-2); box-shadow: var(--shadow); }
.btn-primary {
  background: linear-gradient(135deg, #2563eb, #7c3aed 55%, #db2777);
  border-color: transparent; color: #fff;
}
.btn-primary:hover { background: linear-gradient(135deg, #3b82f6, #8b5cf6 55%, #ec4899); }
.btn-ghost { background: transparent; }

/* ------------------------------------------------------------------- layout */
.grid { display: grid; gap: 1.1rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(265px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(215px, 1fr)); }
.split { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 2rem; align-items: start; }
.stack-lg > * + * { margin-top: 1.4rem; }

/* -------------------------------------------------------------------- cards */
.card {
  background: linear-gradient(180deg, rgba(22, 32, 63, 0.92), rgba(14, 20, 40, 0.92));
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: var(--card-accent, var(--accent)); opacity: 0.75;
}
.card h3, .card h4 { margin-top: 0; }
.card p:last-child, .card ul:last-child { margin-bottom: 0; }
.card-flat { box-shadow: none; background: rgba(16, 23, 46, 0.65); }

.tag-row { display: flex; flex-wrap: wrap; gap: 0.35rem; margin: 0.55rem 0 0; }
.tag {
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.03em;
  padding: 0.16rem 0.5rem; border-radius: 999px;
  border: 1px solid var(--line); color: var(--text-soft); background: rgba(255,255,255,0.03);
  white-space: nowrap;
}
.tag-fam { border-color: color-mix(in srgb, var(--tag-color) 45%, transparent); color: var(--tag-color); background: color-mix(in srgb, var(--tag-color) 12%, transparent); }
.tag-agent { border-color: rgba(244, 114, 182, 0.5); color: var(--f-agent); background: rgba(244, 114, 182, 0.1); }
.tag-warn { border-color: rgba(248, 113, 113, 0.5); color: #fca5a5; background: rgba(248, 113, 113, 0.1); }

/* -------------------------------------------------------------- rating chips */
.rating-chip {
  display: inline-flex; align-items: center; gap: 0.35rem;
  font-family: var(--font-display); font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.07em; text-transform: uppercase;
  padding: 0.24rem 0.6rem; border-radius: 999px; white-space: nowrap;
  border: 1px solid currentColor;
}
.rating-chip::before { content: "●"; font-size: 0.7em; }
.rating-mature { color: var(--r-mature); background: rgba(52, 211, 153, 0.1); }
.rating-test { color: var(--r-test); background: rgba(251, 191, 36, 0.1); }
.rating-early { color: var(--r-early); background: rgba(251, 146, 60, 0.1); }
.rating-study { color: var(--r-study); background: rgba(96, 165, 250, 0.1); }
.rating-skip { color: var(--r-skip); background: rgba(248, 113, 113, 0.1); }
.rating-notsandbox { color: var(--r-notsandbox); background: rgba(148, 163, 184, 0.12); }

/* ---------------------------------------------------------------- repo cards */
.repo-card {
  background: rgba(17, 24, 50, 0.78);
  border: 1px solid var(--line-soft);
  border-left: 4px solid var(--card-accent, var(--accent));
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
  display: flex; flex-direction: column; gap: 0.5rem;
}
.repo-card header { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.6rem; flex-wrap: wrap; }
.repo-card h3 { margin: 0; font-size: 1.06rem; }
.repo-card h3 a { color: var(--text); text-decoration: none; }
.repo-card h3 a:hover { color: var(--accent); }
.repo-card .blurb { color: var(--text-soft); font-size: 0.95rem; margin: 0; }
.repo-meta {
  display: flex; flex-wrap: wrap; gap: 0.75rem;
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-dim);
  border-top: 1px dashed var(--line-soft); padding-top: 0.5rem; margin-top: auto;
}
.repo-meta b { color: var(--text-soft); font-weight: 500; }

/* ----------------------------------------------------------------- callouts */
.callout {
  border-radius: var(--radius-sm); padding: 0.95rem 1.1rem 0.95rem 1.15rem;
  margin: 1.4rem 0; border: 1px solid var(--line);
  background: rgba(17, 24, 50, 0.7);
  border-left-width: 4px;
}
.callout > :first-child { margin-top: 0; }
.callout > :last-child { margin-bottom: 0; }
.callout + .callout { margin-top: -0.6rem; }
.callout-title { font-family: var(--font-display); font-weight: 600; display: block; margin-bottom: 0.3rem; }
.callout.warn { border-left-color: var(--r-test); background: rgba(251, 191, 36, 0.07); }
.callout.warn .callout-title { color: var(--r-test); }
.callout.danger { border-left-color: var(--r-skip); background: rgba(248, 113, 113, 0.07); }
.callout.danger .callout-title { color: #fca5a5; }
.callout.good { border-left-color: var(--r-mature); background: rgba(52, 211, 153, 0.07); }
.callout.good .callout-title { color: #6ee7b7; }
.callout.note { border-left-color: var(--accent); background: rgba(125, 211, 252, 0.06); }
.callout.note .callout-title { color: var(--accent); }
.callout.idea { border-left-color: var(--f-secrets); background: rgba(52, 211, 153, 0.06); }
.callout.idea .callout-title { color: var(--f-secrets); }

/* -------------------------------------------------------------------- tables */
.table-wrap { overflow-x: auto; margin: 1.5rem 0; border: 1px solid var(--line-soft); border-radius: var(--radius-sm); background: rgba(12, 18, 36, 0.75); }
table { border-collapse: collapse; width: 100%; font-size: 0.93rem; }
caption { caption-side: top; text-align: left; padding: 0.7rem 1rem; color: var(--text-dim); font-size: 0.85rem; }
th, td { padding: 0.6rem 0.85rem; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line-soft); }
thead th {
  position: sticky; top: 0; z-index: 2;
  background: var(--panel-3); color: #fff;
  font-family: var(--font-display); font-size: 0.78rem; letter-spacing: 0.05em; text-transform: uppercase;
  border-bottom: 1px solid var(--line);
}
tbody tr:nth-child(even) { background: rgba(255, 255, 255, 0.017); }
tbody tr:hover { background: rgba(125, 211, 252, 0.05); }
td.num, th.num { text-align: right; font-family: var(--font-mono); font-size: 0.85rem; }
td.pos { color: #6ee7b7; }
td.neg { color: #fca5a5; }

/* --------------------------------------------------------------------- code */
pre {
  background: #060a16; border: 1px solid var(--line-soft); border-radius: var(--radius-sm);
  padding: 0.95rem 1.05rem; overflow-x: auto; font-size: 0.86rem; line-height: 1.55; margin: 1.2rem 0;
}
pre code { background: none; border: 0; padding: 0; color: #c7d7f5; }

/* ----------------------------------------------------------------- diagrams */
figure { margin: 1.8rem 0; }
figure > svg { display: block; width: 100%; height: auto; border-radius: var(--radius-sm); }
figure.plain > svg { border: 1px solid var(--line-soft); background: rgba(8, 12, 24, 0.6); }
figcaption {
  margin-top: 0.6rem; font-size: 0.85rem; color: var(--text-dim);
  border-left: 2px solid var(--line); padding-left: 0.7rem;
}
.svg-mono { font-family: var(--font-mono); }

/* ------------------------------------------------------------- profile cards */
.profile {
  border: 1px solid var(--line-soft); border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(20, 28, 56, 0.9), rgba(12, 17, 34, 0.9));
  padding: 0; margin: 1.6rem 0; overflow: hidden;
}
.profile > header {
  padding: 1.1rem 1.3rem; display: flex; flex-wrap: wrap; gap: 0.8rem;
  justify-content: space-between; align-items: center;
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(135deg, rgba(125, 211, 252, 0.08), rgba(240, 171, 252, 0.06));
}
.profile > header h3 { margin: 0; font-size: 1.25rem; }
.profile > header .sub { color: var(--text-dim); font-size: 0.83rem; font-family: var(--font-mono); }
.profile-body { padding: 0.4rem 1.3rem 1.3rem; }
.field { display: grid; grid-template-columns: minmax(11ch, 18ch) 1fr; gap: 0.2rem 1rem; padding: 0.5rem 0; border-bottom: 1px dashed var(--line-soft); }
.field:last-child { border-bottom: 0; }
.field dt { font-family: var(--font-display); font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-dim); padding-top: 0.2rem; }
.field dd { margin: 0; color: var(--text-soft); font-size: 0.95rem; }
.field dd strong { color: #fff; }
.stat-strip { display: flex; flex-wrap: wrap; gap: 1.1rem; font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-dim); }
.stat-strip b { color: var(--text); font-weight: 500; }

/* ---------------------------------------------------------------- case cards */
.case {
  display: grid; grid-template-columns: 3.4rem 1fr; gap: 0.9rem;
  padding: 0.9rem 0; border-bottom: 1px dashed var(--line-soft);
}
.case:last-child { border-bottom: 0; }
.case .num {
  font-family: var(--font-display); font-size: 1.5rem; font-weight: 700;
  color: var(--card-accent, var(--accent)); line-height: 1;
}
.case h4 { margin: 0 0 0.15rem; text-transform: none; letter-spacing: 0; color: var(--text); font-size: 1rem; }
.case p { margin: 0; color: var(--text-soft); font-size: 0.94rem; }

/* ------------------------------------------------------------------ prev/next */
.prev-next {
  width: min(100% - 2.4rem, var(--maxw)); margin: 3rem auto 1rem;
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
}
.pn {
  display: flex; flex-direction: column; gap: 0.15rem; text-decoration: none;
  border: 1px solid var(--line-soft); border-radius: var(--radius-sm);
  padding: 0.8rem 1rem; background: rgba(17, 24, 50, 0.6); color: var(--text);
}
.pn span { font-size: 0.7rem; letter-spacing: 0.13em; text-transform: uppercase; color: var(--text-dim); }
.pn strong { font-family: var(--font-display); font-weight: 500; }
.pn:hover { border-color: var(--accent); background: rgba(125, 211, 252, 0.08); }
.pn-next { text-align: right; }
.pn-empty { border: 0; background: none; }

/* -------------------------------------------------------------------- footer */
.site-footer {
  margin-top: 3rem; border-top: 1px solid var(--line-soft);
  background: rgba(6, 9, 18, 0.8); padding: 2.4rem 0 1.6rem;
}

/* The paper theme needs opaque light surfaces because several original cards
   use translucent dark-blue values. These targeted overrides keep text and
   controls legible without duplicating every component rule. */
:root[data-theme="paper"] .site-header { background: rgba(250,247,240,.90); }
:root[data-theme="paper"] .card,
:root[data-theme="paper"] .repo-card,
:root[data-theme="paper"] .callout,
:root[data-theme="paper"] .table-wrap,
:root[data-theme="paper"] .stack-card,
:root[data-theme="paper"] .kpi,
:root[data-theme="paper"] .toc,
:root[data-theme="paper"] .pn { background: rgba(255,253,248,.88); }
:root[data-theme="paper"] .card-flat,
:root[data-theme="paper"] .layer { background: rgba(247,242,233,.92); }
:root[data-theme="paper"] .profile { background: rgba(255,253,248,.94); }
:root[data-theme="paper"] .profile > header { background: linear-gradient(135deg, rgba(12,101,125,.08), rgba(129,75,137,.07)); }
:root[data-theme="paper"] .site-footer { background: rgba(234,228,216,.88); }
:root[data-theme="paper"] pre { background: #1c2521; color: #def5e5; }
:root[data-theme="paper"] pre code { color: #def5e5; }
:root[data-theme="paper"] thead th { color: var(--text); }
:root[data-theme="paper"] p code,
:root[data-theme="paper"] li code,
:root[data-theme="paper"] td code,
:root[data-theme="paper"] th code { color: #075269; background: rgba(12,101,125,.08); border-color: rgba(12,101,125,.20); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}
.footer-grid {
  width: min(100% - 2.4rem, var(--maxw)); margin-inline: auto;
  display: grid; grid-template-columns: 1.4fr repeat(5, minmax(0, 1fr)); gap: 1.4rem;
}
.footer-about p { color: var(--text-dim); font-size: 0.88rem; }
.footer-about strong { font-family: var(--font-display); font-size: 1.05rem; }
.footer-meta { font-size: 0.8rem !important; }
.site-footer h4 { font-size: 0.7rem; margin: 0 0 0.5rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: 0.22rem 0; }
.site-footer a { color: var(--text-soft); text-decoration: none; font-size: 0.85rem; }
.site-footer a:hover { color: var(--accent); }
.footer-legal {
  width: min(100% - 2.4rem, var(--maxw)); margin: 1.6rem auto 0;
  border-top: 1px solid var(--line-soft); padding-top: 0.9rem;
  color: var(--text-dim); font-size: 0.78rem;
}


/* ---------------------------------------------------------------- stack view */
.stack-list { display: grid; gap: 1.2rem; }
.stack-card { border: 1px solid var(--line-soft); border-radius: var(--radius); background: rgba(15, 22, 44, 0.8); overflow: hidden; }
.stack-card > header { padding: 0.95rem 1.15rem; border-bottom: 1px solid var(--line-soft); display: flex; justify-content: space-between; gap: 0.8rem; flex-wrap: wrap; align-items: center; }
.stack-card > header h3 { margin: 0; }
.stack-card > .stack-body { padding: 1rem 1.15rem 1.2rem; }
.layer {
  border-radius: var(--radius-sm); padding: 0.6rem 0.9rem; border: 1px solid var(--line);
  background: rgba(9, 14, 28, 0.8); display: flex; justify-content: space-between; gap: 0.8rem; flex-wrap: wrap;
  border-left: 4px solid var(--layer-color, var(--accent));
}
.layer + .layer { margin-top: 0.4rem; }
.layer .lname { font-family: var(--font-display); font-weight: 600; }
.layer .lwhy { color: var(--text-dim); font-size: 0.85rem; }
.arrow-down { text-align: center; color: var(--text-dim); font-family: var(--font-mono); font-size: 0.8rem; margin: 0.1rem 0; }

/* ------------------------------------------------------------------- misc */
.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 0.9rem; margin: 1.4rem 0; }
.kpi { border: 1px solid var(--line-soft); border-radius: var(--radius-sm); padding: 0.85rem 1rem; background: rgba(14, 20, 40, 0.75); }
.kpi .n { font-family: var(--font-display); font-size: 1.75rem; font-weight: 700; color: var(--accent); line-height: 1.1; }
.kpi .l { color: var(--text-dim); font-size: 0.8rem; }
.pill-row { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.8rem 0; }
.pill {
  font-size: 0.8rem; padding: 0.28rem 0.7rem; border-radius: 999px;
  border: 1px solid var(--line); background: rgba(255,255,255,0.03); color: var(--text-soft);
}
.toc { border: 1px solid var(--line-soft); border-radius: var(--radius-sm); padding: 0.9rem 1.1rem; background: rgba(12, 18, 36, 0.7); margin: 1.4rem 0; }
.toc h4 { margin-top: 0; }
.toc ol { margin: 0; padding-left: 1.2rem; }
.toc a { text-decoration: none; color: var(--text-soft); }
.toc a:hover { color: var(--accent); }
.fine { color: var(--text-dim); font-size: 0.86rem; }
.anchor-offset { scroll-margin-top: 6rem; }

@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
}
@media (max-width: 900px) {
  .hero-grid, .split { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-block; }
  .site-nav { display: none; width: 100%; }
  .site-nav.open { display: flex; flex-direction: column; align-items: flex-start; gap: 0.6rem; padding-bottom: 0.7rem; }
  .nav-group { flex-direction: column; align-items: flex-start; }
  .nav-links { flex-wrap: wrap; }
  .theme-control { margin-left: auto; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .prev-next { grid-template-columns: 1fr; }
  .field { grid-template-columns: 1fr; gap: 0.1rem 0; }
  .case { grid-template-columns: 2.4rem 1fr; }
}

@media print {
  body { background: #fff; color: #111; }
  body::before, .site-header, .prev-next, .site-footer { display: none; }
  .card, .repo-card, .profile, .callout { box-shadow: none; border-color: #ccc; background: #fff; color: #111; }
}