/* ==============================================================
   SM_120 Microbenchmark Final Reports — Shared Stylesheet
   Adapted from temp/sm120.html, scaled for 1800px viewport.
   ============================================================== */

/* AI-generated disclaimer banner */
.ai-disclaimer {
  background: #fffbeb;
  border-bottom: 1px solid #f59e0b;
  padding: 10px 24px;
  font-family: var(--sans);
  font-size: 13px;
  color: #92400e;
  text-align: center;
  letter-spacing: 0.01em;
  line-height: 1.5;
}


@import url("https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300..700;1,9..144,300..700&family=IBM+Plex+Sans:ital,wght@0,300..700;1,300..700&family=IBM+Plex+Mono:wght@400;500;600&family=JetBrains+Mono:wght@400..700&display=swap");

:root {
  --bg: #fcfbf6;
  --bg-2: #f6f4ed;
  --paper: #ffffff;
  --ink: #0b1220;
  --ink-2: #2a3548;
  --ink-3: #5b6679;
  --ink-4: #8e97a5;
  --rule: #e6e4da;
  --rule-2: #efeee6;
  --accent: #76b900;
  --accent-2: #5a8e00;
  --accent-soft: #e9f3d2;
  --violet: #6d28d9;
  --violet-soft: #ede7fb;
  --blue: #1e40af;
  --blue-soft: #e0e7ff;
  --orange: #ea580c;
  --orange-soft: #ffedd5;
  --rose: #e11d48;
  --rose-soft: #ffe4e6;
  --mint: #047857;
  --mint-soft: #d1fae5;
  --amber: #b45309;
  --amber-soft: #fef3c7;
  --shadow-sm:
    0 1px 2px rgba(11, 18, 32, 0.04), 0 1px 1px rgba(11, 18, 32, 0.02);
  --shadow:
    0 8px 24px -8px rgba(11, 18, 32, 0.1), 0 2px 6px -2px rgba(11, 18, 32, 0.05);
  --shadow-lg:
    0 24px 48px -12px rgba(11, 18, 32, 0.14),
    0 4px 8px -2px rgba(11, 18, 32, 0.06);
  --serif: "Fraunces", "Source Han Serif SC", "Noto Serif SC", Georgia, serif;
  --sans:
    "IBM Plex Sans", "PingFang SC", "Microsoft YaHei", -apple-system, system-ui,
    sans-serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", "Menlo", "Consolas", monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  font-size: 16px;
}
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-feature-settings: "ss01", "cv11", "liga", "calt";
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ====================== Layout shell (1800px content target) ====================== */
.shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 240px;
  max-width: 2200px;
  margin: 0 auto;
}
@media (max-width: 1400px) {
  .shell {
    grid-template-columns: 260px minmax(0, 1fr);
  }
  .toc-right {
    display: none !important;
  }
}
@media (max-width: 1100px) {
  .shell {
    grid-template-columns: 1fr;
  }
  .toc {
    display: none !important;
  }
  .toc-right {
    display: none !important;
  }
}

/* ====================== Sticky TOC ====================== */
.toc {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 38px 24px 38px 36px;
  border-right: 1px solid var(--rule);
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
}
.toc::-webkit-scrollbar {
  width: 6px;
}
.toc::-webkit-scrollbar-thumb {
  background: var(--rule);
  border-radius: 6px;
}
.toc-brand {
  font-family: var(--serif);
  font-weight: 600;
  font-style: italic;
  font-size: 21px;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.15;
  margin-bottom: 6px;
}
.toc-brand .accent {
  color: var(--accent-2);
  font-style: normal;
}
.toc-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 99px;
  background: var(--accent-soft);
  color: var(--accent-2);
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}
.toc h4 {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin: 22px 0 8px;
}
.toc a {
  display: block;
  font-size: 13.5px;
  color: var(--ink-2);
  text-decoration: none;
  padding: 5px 0 5px 12px;
  border-left: 2px solid transparent;
  transition: all 0.18s ease;
  line-height: 1.45;
}
.toc a:hover {
  color: var(--accent-2);
  border-left-color: var(--accent);
}
.toc a.active {
  color: var(--ink);
  border-left-color: var(--accent);
  font-weight: 600;
  background: linear-gradient(90deg, rgba(118, 185, 0, 0.08), transparent);
}
.toc a.sub {
  font-size: 12.5px;
  padding-left: 22px;
  color: var(--ink-3);
}
.toc a.sub:hover {
  color: var(--accent-2);
}
.toc-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  text-decoration: none;
  padding: 6px 10px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  margin-bottom: 18px;
  transition: all 0.18s ease;
}
.toc-back:hover {
  border-color: var(--accent);
  color: var(--accent-2);
  background: var(--accent-soft);
}

/* ====================== Right TOC (Chapter Navigation) ====================== */
.toc-right {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 38px 20px 38px 16px;
  border-left: 1px solid var(--rule);
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
}
.toc-right::-webkit-scrollbar {
  width: 5px;
}
.toc-right::-webkit-scrollbar-thumb {
  background: var(--rule);
  border-radius: 6px;
}
.toc-right h4 {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin: 0 0 10px;
}
.toc-right a {
  display: block;
  font-size: 12.5px;
  color: var(--ink-3);
  text-decoration: none;
  padding: 3px 0 3px 10px;
  border-left: 2px solid transparent;
  transition: all 0.18s ease;
  line-height: 1.4;
}
.toc-right a:hover {
  color: var(--accent-2);
  border-left-color: var(--accent);
}
.toc-right a.active {
  color: var(--ink);
  border-left-color: var(--accent);
  font-weight: 600;
}
.toc-right a.sub {
  font-size: 11.5px;
  padding-left: 18px;
  color: var(--ink-4);
}
.toc-right a.sub:hover {
  color: var(--accent-2);
}

/* ====================== Main content ====================== */
.content {
  padding: 48px clamp(28px, 4vw, 88px) 96px;
  max-width: 1800px;
}

/* ====================== Hero ====================== */
.hero {
  position: relative;
  padding: 28px 0 56px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 56px;
}
.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: -30px;
  right: -30px;
  bottom: 0;
  background:
    radial-gradient(
      900px 280px at 12% 0%,
      rgba(118, 185, 0, 0.08),
      transparent 60%
    ),
    radial-gradient(
      700px 280px at 88% 30%,
      rgba(109, 40, 217, 0.06),
      transparent 60%
    );
  pointer-events: none;
  z-index: 0;
}
.hero > * {
  position: relative;
  z-index: 1;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--ink-3);
  text-transform: uppercase;
  margin-bottom: 18px;
}
.hero-eyebrow .pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(118, 185, 0, 0.18);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.3);
    opacity: 0.7;
  }
}
h1.hero-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(36px, 4.5vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin-bottom: 14px;
}
h1.hero-title em {
  font-style: italic;
  font-weight: 400;
  color: var(--accent-2);
}
.hero-sub {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 300;
  font-size: 20px;
  color: var(--ink-3);
  max-width: 920px;
  margin-bottom: 32px;
}
.hero-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}
@media (max-width: 980px) {
  .hero-meta {
    grid-template-columns: repeat(2, 1fr);
  }
}
.meta-cell {
  padding: 14px 16px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
}
.meta-cell .lbl {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-4);
  margin-bottom: 4px;
}
.meta-cell .val {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 18px;
  color: var(--ink);
  line-height: 1.1;
  letter-spacing: -0.01em;
}
.meta-cell .val small {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 11.5px;
  color: var(--ink-3);
  margin-left: 4px;
}

/* ====================== Headings ====================== */
h2.ch-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 48px 0 20px;
  scroll-margin-top: 24px;
}
h2.ch-title em {
  font-style: italic;
  color: var(--accent-2);
  font-weight: 400;
}
h3.sub-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 36px 0 14px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  scroll-margin-top: 24px;
}
h3.sub-title::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  transform: translateY(-2px);
  flex-shrink: 0;
}
h4.minor {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 14.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-2);
  margin: 22px 0 10px;
  scroll-margin-top: 24px;
}
h5,
h6 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 13.5px;
  color: var(--ink-2);
  margin: 18px 0 8px;
}

/* ====================== Body text ====================== */
p {
  font-size: 15px;
  color: var(--ink-2);
  margin-bottom: 14px;
}
p strong {
  color: var(--ink);
  font-weight: 600;
}
.lede {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 300;
  font-size: 18.5px;
  color: var(--ink-3);
  border-left: 2px solid var(--accent);
  padding: 6px 0 6px 18px;
  margin: 8px 0 28px;
}
ul,
ol {
  margin: 8px 0 18px;
  padding-left: 22px;
}
ul li,
ol li {
  font-size: 14.5px;
  color: var(--ink-2);
  margin-bottom: 6px;
  line-height: 1.6;
}
ul li::marker {
  color: var(--accent-2);
}
blockquote {
  border-left: 3px solid var(--accent);
  background: var(--bg-2);
  padding: 12px 18px;
  margin: 14px 0 22px;
  border-radius: 0 8px 8px 0;
  color: var(--ink-2);
  font-size: 14.5px;
}
blockquote p {
  margin-bottom: 6px;
  max-width: none;
}
blockquote p:last-child {
  margin-bottom: 0;
}
hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 32px 0;
}
a {
  color: var(--accent-2);
  text-decoration: none;
  transition: color 0.18s ease;
}
a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--accent);
}

/* ====================== Key points list ====================== */
.points {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 0 12px 12px 0;
  padding: 20px 24px;
  margin: 12px 0 28px;
  box-shadow: var(--shadow-sm);
  max-width: none;
}
.points-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent-2);
  margin-bottom: 10px;
}
.points ol {
  padding-left: 0;
  list-style: none;
  counter-reset: pt;
  margin: 0;
}
.points li {
  counter-increment: pt;
  font-size: 14.5px;
  color: var(--ink-2);
  padding: 6px 0 6px 36px;
  position: relative;
  line-height: 1.55;
  margin-bottom: 0;
}
.points li::before {
  content: counter(pt, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 6px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 11px;
  color: var(--accent-2);
  background: var(--accent-soft);
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: 0.04em;
}
.points li::marker {
  content: "";
}

/* ====================== Tables ====================== */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--paper);
  box-shadow: var(--shadow-sm);
  margin: 18px 0 28px;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  text-align: left;
}
table thead {
  background: var(--bg-2);
  border-bottom: 2px solid var(--rule);
}
table th {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-2);
  padding: 11px 14px;
  text-align: left;
  vertical-align: bottom;
  white-space: nowrap;
}
table td {
  padding: 10px 14px;
  border-top: 1px solid var(--rule-2);
  color: var(--ink-2);
  vertical-align: top;
  line-height: 1.5;
}
table tr:hover td {
  background: rgba(118, 185, 0, 0.025);
}
table td strong {
  color: var(--ink);
  font-weight: 600;
}
table code,
p code,
li code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--bg-2);
  color: var(--ink);
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid var(--rule);
}

/* Inline citation tag for [SX/case_Y] references */
.cite {
  font-family: var(--mono);
  font-size: 0.84em;
  font-weight: 500;
  color: var(--violet);
  background: var(--violet-soft);
  padding: 1px 7px;
  border-radius: 99px;
  white-space: nowrap;
  letter-spacing: 0.01em;
  border: 1px solid rgba(109, 40, 217, 0.18);
}
.cite:hover {
  background: #ddd0fa;
  color: #4c1d95;
}

/* Table footnote — sits directly under a .table-wrap to annotate table content */
.table-note {
  margin: -22px 0 26px;
  padding: 10px 14px 11px;
  background: var(--bg-2);
  border-left: 3px solid var(--rule);
  border-radius: 0 6px 6px 0;
  font-size: 12.5px;
  color: var(--ink-2);
  line-height: 1.55;
}
.table-note .note-label {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  margin-right: 6px;
}

/* ====================== Code block ====================== */
pre {
  background: #f8f7f2;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.6;
  padding: 22px 22px 18px;
  border-radius: 10px;
  overflow-x: auto;
  border: 1px solid var(--rule);
  box-shadow: var(--shadow-sm);
  margin: 16px 0 26px;
  position: relative;
}
pre::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 14px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #76b900;
  box-shadow:
    14px 0 0 #fbbf24,
    28px 0 0 #ef4444;
  opacity: 0.5;
}
pre code {
  display: block;
  margin-top: 8px;
  padding-top: 0;
  background: transparent;
  border: none;
  color: inherit;
  font-size: inherit;
}
pre code.hljs {
  background: transparent;
  padding: 0;
}

/* highlight.js atom-one-light minimal overrides */
.hljs-comment,
.hljs-quote {
  color: #a0a1a7;
  font-style: italic;
}
.hljs-keyword,
.hljs-selector-tag,
.hljs-literal,
.hljs-section,
.hljs-link {
  color: #a626a4;
}
.hljs-string,
.hljs-attr {
  color: #50a14f;
}
.hljs-number,
.hljs-built_in,
.hljs-builtin-name,
.hljs-type {
  color: #986801;
}
.hljs-title,
.hljs-name {
  color: #4078f2;
  font-weight: 600;
}
.hljs-variable,
.hljs-template-variable,
.hljs-symbol {
  color: #e45649;
}
.hljs-meta {
  color: #a0a1a7;
}

/* ====================== ASCII art / preformatted (kept for fallback) ====================== */
pre.ascii-art {
  font-size: 11.5px;
  line-height: 1.4;
  background: var(--bg-2);
  color: var(--ink-2);
  border: 1px dashed var(--rule);
  white-space: pre;
}

/* ====================== Callouts ====================== */
.callout {
  display: block;
  padding: 14px 18px;
  border-radius: 10px;
  margin: 14px 0 22px;
  font-size: 14px;
  line-height: 1.65;
  border: 1px solid var(--rule);
  background: var(--paper);
}
.callout p {
  margin-bottom: 0;
  color: var(--ink-2);
  max-width: none;
}
.callout strong {
  color: var(--ink);
}
.callout-warn {
  border-color: #f4d88e;
  background: #fffcf1;
}
.callout-danger {
  border-color: #f8b4c0;
  background: #fff5f7;
}
.callout-info {
  border-color: #c4d2fb;
  background: #f8faff;
}
.callout-tip {
  border-color: #b7e0a5;
  background: #f4faec;
}

/* ====================== Stat / KPI cards ====================== */
.stat-grid {
  display: grid;
  gap: 16px;
  margin: 22px 0 30px;
}
.stat-grid.cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.stat-grid.cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.stat-grid.cols-5 {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}
.stat-grid.cols-6 {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}
@media (max-width: 1280px) {
  .stat-grid.cols-4,
  .stat-grid.cols-5,
  .stat-grid.cols-6 {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 880px) {
  .stat-grid.cols-3,
  .stat-grid.cols-4,
  .stat-grid.cols-5,
  .stat-grid.cols-6 {
    grid-template-columns: repeat(2, 1fr);
  }
}
.stat {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 18px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}
.stat::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--violet));
  opacity: 0.6;
}
.stat .lbl {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-4);
  margin-bottom: 8px;
}
.stat .val {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 30px;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1;
}
.stat .val .unit {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-3);
  margin-left: 3px;
}
.stat .desc {
  font-size: 12.5px;
  color: var(--ink-3);
  margin-top: 8px;
  line-height: 1.45;
}

/* ====================== Figure container ====================== */
figure.diagram {
  margin: 22px 0 30px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 22px 24px 18px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
figure.diagram::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(
      600px 200px at 0% 0%,
      rgba(118, 185, 0, 0.025),
      transparent 50%
    ),
    radial-gradient(
      600px 200px at 100% 100%,
      rgba(109, 40, 217, 0.02),
      transparent 50%
    );
  pointer-events: none;
}
figure.diagram > * {
  position: relative;
}
figure.diagram svg,
figure.diagram object,
figure.diagram img {
  width: 100%;
  height: auto;
  display: block;
  max-width: 100%;
}
figure.diagram object {
  min-height: 200px;
}
figure.diagram figcaption {
  font-size: 12.5px;
  color: var(--ink-3);
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--rule);
  font-family: var(--serif);
  font-style: italic;
  line-height: 1.55;
}
figure.diagram figcaption .fig-num {
  font-family: var(--mono);
  font-style: normal;
  font-weight: 600;
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--accent-2);
  text-transform: uppercase;
  margin-right: 8px;
}

/* ====================== Math (KaTeX) ====================== */
.math-display {
  margin: 16px 0 22px;
  padding: 12px 16px;
  background: var(--paper);
  border: 1px solid var(--rule-2);
  border-radius: 8px;
  overflow-x: auto;
  text-align: center;
}
.math-display .katex {
  font-size: 1.1em;
}
.math-inline .katex {
  font-size: 1em;
}
.katex {
  color: var(--ink);
}

/* ====================== Anchor offset ====================== */
[id] {
  scroll-margin-top: 24px;
}

/* ====================== Bullets variant ====================== */
ul.bullets {
  padding-left: 0;
  list-style: none;
  margin: 8px 0 18px;
}
ul.bullets li {
  font-size: 14.5px;
  color: var(--ink-2);
  padding: 4px 0 4px 22px;
  position: relative;
  line-height: 1.55;
}
ul.bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  width: 8px;
  height: 1.5px;
  background: var(--accent);
}
ul.bullets li strong {
  color: var(--ink);
}

/* ====================== Index page (chapter cards grid) ====================== */
.ch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 22px;
  margin: 28px 0 56px;
}
.ch-card {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 24px 22px 22px;
  text-decoration: none;
  color: var(--ink);
  position: relative;
  overflow: hidden;
  transition:
    transform 0.22s ease,
    box-shadow 0.22s ease,
    border-color 0.22s ease;
  box-shadow: var(--shadow-sm);
  display: block;
}
.ch-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--violet) 100%);
  opacity: 0;
  transition: opacity 0.22s ease;
}
.ch-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}
.ch-card:hover::before {
  opacity: 1;
}
.ch-card .ch-num {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--accent-2);
  margin-bottom: 8px;
  display: block;
  text-transform: uppercase;
}
.ch-card .ch-name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 21px;
  letter-spacing: -0.01em;
  color: var(--ink);
  line-height: 1.2;
  margin-bottom: 10px;
}
.ch-card .ch-desc {
  font-size: 13px;
  color: var(--ink-3);
  line-height: 1.55;
  margin-bottom: 14px;
}
.ch-card .ch-meta {
  display: flex;
  gap: 12px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-4);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.ch-card .ch-meta span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.ch-card .ch-meta .dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}
.ch-card.appendix::before {
  background: linear-gradient(90deg, var(--violet) 0%, var(--blue) 100%);
}
.ch-card.appendix .ch-num {
  color: var(--violet);
}

/* ====================== Footer ====================== */
.page-footer {
  margin-top: 80px;
  padding: 36px 56px;
  border-top: 2px solid var(--ink);
  background: var(--ink);
  color: #cbd5e1;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}
.page-footer .foot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
  max-width: 1800px;
  margin: 0 auto;
}
.page-footer strong {
  color: #fff;
  font-family: var(--sans);
}
.page-footer .foot-accent {
  color: var(--accent);
  text-align: right;
}
.page-footer a {
  color: #cbd5e1;
}
.page-footer a:hover {
  color: #fff;
}
@media (max-width: 980px) {
  .page-footer .foot-grid {
    grid-template-columns: 1fr;
  }
  .page-footer .foot-accent {
    text-align: left;
  }
}

/* ====================== Misc ====================== */
mark {
  background: linear-gradient(
    180deg,
    transparent 60%,
    rgba(118, 185, 0, 0.28) 60%
  );
  color: inherit;
  padding: 0 2px;
}
.num {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}
.kbd {
  font-family: var(--mono);
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 5px;
  border: 1px solid var(--rule);
  background: var(--bg-2);
  color: var(--ink);
  box-shadow: inset 0 -1px 0 var(--rule);
}

/* SVG common labels */
.svg-text {
  font-family: var(--mono);
  font-size: 11px;
  fill: var(--ink-2);
}
.svg-text-sm {
  font-family: var(--mono);
  font-size: 9.5px;
  fill: var(--ink-3);
}
.svg-title {
  font-family: var(--serif);
  font-size: 14px;
  font-weight: 600;
  fill: var(--ink);
}
.svg-axis {
  stroke: var(--rule);
  stroke-width: 1;
}
.svg-grid {
  stroke: var(--rule-2);
  stroke-width: 1;
  stroke-dasharray: 2 3;
}