:root {
  --bg: #f7f8fc;
  --surface: #ffffff;
  --surface-soft: #eef1ff;
  --text: #0f172a;
  --muted: #5b6780;
  --line: #d7deef;
  --accent: #0ea5a5;
  --accent-2: #2563eb;
  --danger: #dc2626;
  --radius: 18px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

html[data-theme='dark'] {
  --bg: #0b1220;
  --surface: #121b2e;
  --surface-soft: #1a2640;
  --text: #e5edff;
  --muted: #9aa7c7;
  --line: #2b3b61;
  --accent: #2dd4bf;
  --accent-2: #60a5fa;
  --danger: #f87171;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #fbfcff 0%, var(--bg) 45%, #eef3ff 100%);
  min-height: 100vh;
  transition: background .3s ease, color .3s ease;
}
html[data-theme='dark'] body {
  background: linear-gradient(180deg, #070b15 0%, var(--bg) 45%, #0d1627 100%);
}

.bg-orb { position: fixed; border-radius: 999px; filter: blur(60px); pointer-events: none; z-index: -3; }
.orb-a { width: 280px; height: 280px; background: rgba(14, 165, 165, .2); top: -70px; left: -40px; }
.orb-b { width: 340px; height: 340px; background: rgba(37, 99, 235, .16); top: 120px; right: -80px; }

.md-bg { position: fixed; inset: 0; pointer-events: none; z-index: -2; overflow: hidden; }
.md-bg .cyber-grid {
  position: absolute;
  inset: 0;
  opacity: .24;
  background-image:
    linear-gradient(to right, rgba(96, 165, 250, .14) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(45, 212, 191, .11) 1px, transparent 1px);
  background-size: 52px 52px;
  transform: perspective(900px) rotateX(66deg) scale(1.25) translateY(22%);
  transform-origin: center bottom;
  animation: gridDrift 18s linear infinite;
}
.md-bg .cyber-scan {
  position: absolute;
  left: -10%;
  right: -10%;
  height: 140px;
  top: -180px;
  background: linear-gradient(180deg, rgba(34, 211, 238, .0), rgba(34, 211, 238, .23), rgba(34, 211, 238, 0));
  filter: blur(14px);
  animation: scanMove 9s ease-in-out infinite;
}
.md-bg .cyber-ecg {
  position: absolute;
  left: -15%;
  right: -15%;
  top: 35%;
  height: 2px;
  opacity: .44;
  background:
    linear-gradient(
      90deg,
      transparent 0 7%,
      #22d3ee 10% 12%,
      #fb7185 12% 13%,
      #22d3ee 13% 16%,
      transparent 18% 24%,
      #22d3ee 27% 29%,
      #fb7185 29% 30%,
      #22d3ee 30% 33%,
      transparent 35% 100%
    );
  box-shadow: 0 0 20px rgba(34, 211, 238, .4);
  animation: ecgSweep 7s linear infinite;
}
.md-bg .cyber-cross {
  position: absolute;
  color: rgba(244, 63, 94, .42);
  font-size: 26px;
  text-shadow: 0 0 14px rgba(251, 113, 133, .55);
  animation: crossFloat 13s linear infinite;
}
.md-bg .cyber-cross::before { content: "✚"; }
.md-bg .c1 { left: 14%; bottom: -42px; animation-duration: 12s; }
.md-bg .c2 { left: 48%; bottom: -42px; animation-duration: 16s; animation-delay: 2.3s; }
.md-bg .c3 { left: 80%; bottom: -42px; animation-duration: 14s; animation-delay: 1.1s; }
.md-bg .cyber-ring {
  position: absolute;
  border: 1px solid rgba(34, 211, 238, .26);
  border-radius: 999px;
  box-shadow: 0 0 18px rgba(34, 211, 238, .2);
  animation: ringPulse 6s ease-out infinite;
}
.md-bg .r1 { width: 210px; height: 210px; right: 10%; top: 20%; }
.md-bg .r2 { width: 140px; height: 140px; left: 12%; top: 64%; animation-delay: 1.8s; }

html[data-theme='dark'] .md-bg .cyber-grid { opacity: .36; }
html[data-theme='dark'] .md-bg .cyber-scan { opacity: .92; }
html[data-theme='dark'] .md-bg .cyber-ecg { opacity: .62; }

@keyframes gridDrift {
  0% { transform: perspective(900px) rotateX(66deg) scale(1.25) translateY(22%) translateX(0); }
  100% { transform: perspective(900px) rotateX(66deg) scale(1.25) translateY(22%) translateX(-52px); }
}
@keyframes scanMove {
  0% { top: -180px; }
  50% { top: 72%; }
  100% { top: 110%; }
}
@keyframes ecgSweep {
  0% { transform: translateX(-22%); opacity: .12; }
  10% { opacity: .55; }
  90% { opacity: .42; }
  100% { transform: translateX(22%); opacity: .1; }
}
@keyframes crossFloat {
  0% { transform: translateY(0) rotate(0deg); opacity: 0; }
  10% { opacity: .45; }
  95% { opacity: .24; }
  100% { transform: translateY(-120vh) rotate(14deg); opacity: 0; }
}
@keyframes ringPulse {
  0% { transform: scale(.72); opacity: .15; }
  70% { transform: scale(1.16); opacity: .05; }
  100% { transform: scale(1.28); opacity: 0; }
}
@keyframes cardPulseGreen {
  0% {
    box-shadow: 0 0 0 0 rgba(45, 212, 191, 0.55), var(--shadow);
    border-color: rgba(45, 212, 191, 0.95);
  }
  70% {
    box-shadow: 0 0 0 14px rgba(45, 212, 191, 0), var(--shadow);
    border-color: rgba(45, 212, 191, 0.65);
  }
  100% {
    box-shadow: var(--shadow);
    border-color: var(--line);
  }
}

.toc-toggle {
  position: fixed;
  left: 14px;
  top: 14px;
  z-index: 40;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  padding: 9px 12px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow);
}
.toc-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(6, 10, 20, .45);
  z-index: 41;
}
.toc-drawer {
  position: fixed;
  left: 0;
  top: 0;
  width: min(360px, 86vw);
  height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 16px 14px;
  overflow: auto;
  z-index: 42;
  transform: translateX(-105%);
  transition: transform .25s ease;
}
body.toc-open .toc-drawer { transform: translateX(0); }
.toc-drawer h3 { margin: 2px 0 10px; font-family: "Space Grotesk", sans-serif; }
.toc-group p { margin: 10px 0 6px; font-weight: 700; font-size: .85rem; color: var(--muted); }
.toc-group ul { margin: 0; padding-left: 16px; }
.toc-group li { margin: 0 0 6px; }
.toc-group a { color: var(--text); text-decoration: none; font-size: .86rem; }
.toc-group a:hover { color: var(--accent-2); }
.toc-type { display: inline-block; width: 1.2rem; text-align: center; }
.toc-empty { margin: 0; color: var(--muted); font-size: .85rem; }

.hero { max-width: 1100px; margin: 0 auto; padding: 64px 20px 24px; }
.topline { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.kicker { margin: 0; font-weight: 600; color: var(--accent-2); letter-spacing: .06em; text-transform: uppercase; font-size: .78rem; }
.theme-toggle { border: 1px solid var(--line); background: var(--surface); color: var(--text); border-radius: 999px; padding: 8px 12px; cursor: pointer; font-weight: 600; }

h1 { margin: 10px 0 6px; font-family: "Space Grotesk", sans-serif; font-size: clamp(2.1rem, 6vw, 4rem); line-height: 1.05; }
.subtitle { margin: 0 0 24px; color: var(--muted); }

.search-wrap { display: flex; align-items: center; gap: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 999px; box-shadow: var(--shadow); padding: 8px 10px; }
.search-wrap input { flex: 1; border: none; background: transparent; padding: 10px 12px; font-size: 1rem; color: var(--text); outline: none; }
.search-hint { font-size: .8rem; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 4px 8px; background: var(--surface-soft); }
.actions { margin-top: 12px; display: flex; gap: 8px; flex-wrap: wrap; }
.action-btn { border: 1px solid var(--line); background: var(--surface); color: var(--text); border-radius: 10px; padding: 8px 12px; text-decoration: none; cursor: pointer; font-weight: 600; font-size: .9rem; }
.action-btn:hover { border-color: var(--accent-2); }

.chips { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border: 1px solid var(--line); background: var(--surface); color: var(--text); border-radius: 999px; padding: 7px 12px; cursor: pointer; font-weight: 500; transition: transform .2s ease, background .2s ease, color .2s ease; }
.chip:hover { transform: translateY(-1px); }
.chip.active { background: var(--accent-2); color: #fff; border-color: transparent; }

.container { max-width: 1100px; margin: 0 auto; padding: 16px 20px 60px; }
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.stat-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow); }
.stat-card h3 { margin: 0; font-family: "Space Grotesk", sans-serif; font-size: 1.8rem; }
.stat-card p { margin: 6px 0 0; color: var(--muted); }

.preamble-section {
  margin-top: 14px;
  background: linear-gradient(135deg, rgba(14, 165, 165, .12), rgba(37, 99, 235, .09));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}
.preamble-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 6px; }
.preamble-kicker {
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  font-weight: 700;
  color: var(--accent-2);
}
.preamble-section h2 { margin: 0 0 10px; font-family: "Space Grotesk", sans-serif; }
.preamble-body { display: grid; gap: 8px; }

.list-head { margin: 28px 0 10px; display: flex; justify-content: space-between; align-items: baseline; gap: 16px; }
.list-head h2 { margin: 0; font-family: "Space Grotesk", sans-serif; }
#activeFilter { margin: 0; color: var(--muted); }

.rules-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; align-items: start; }
.rule-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); transition: transform .2s ease, border-color .2s ease; align-self: start; }
.rule-card:hover { transform: translateY(-2px); border-color: #b9c6ef; }
.rule-card.pulse-highlight { animation: cardPulseGreen 1.2s ease infinite; }
.rule-card.expanded { border-color: var(--accent-2); }
.rule-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.badge { font-size: .75rem; padding: 3px 8px; border-radius: 999px; background: var(--surface-soft); color: var(--text); border: 1px solid var(--line); }
.badge.paragraph { background: #e8f9f7; border-color: #b5ebe6; color: #075753; }
html[data-theme='dark'] .badge.paragraph { background: #16323a; border-color: #2e5b64; color: #7ce4d4; }
.badge.level-high { background: #ffecec; border-color: #ffcaca; color: var(--danger); }
html[data-theme='dark'] .badge.level-high { background: #3a1b24; border-color: #6b2b3d; }
.badge.updated { background: #eef7ff; border-color: #c7defa; color: #29548f; }
html[data-theme='dark'] .badge.updated { background: #1b2a45; border-color: #314e80; color: #9fc3ff; }
.badge.type-must { background: #ecfdf5; border-color: #a7f3d0; color: #065f46; }
.badge.type-forbid { background: #fef2f2; border-color: #fecaca; color: #991b1b; }
.badge.type-note { background: #eff6ff; border-color: #bfdbfe; color: #1e3a8a; }
html[data-theme='dark'] .badge.type-must { background: #123128; border-color: #1f5d4a; color: #74dfbe; }
html[data-theme='dark'] .badge.type-forbid { background: #3a1a1a; border-color: #6d2d2d; color: #ffb4b4; }
html[data-theme='dark'] .badge.type-note { background: #1a2c47; border-color: #2f4f84; color: #aac8ff; }

.rule-card h3 { margin: 0 0 8px; font-size: 1.05rem; font-family: "Space Grotesk", sans-serif; }
.rule-card p { margin: 0; color: var(--text); line-height: 1.55; }
.rule-summary {
  margin: 0 0 10px !important;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px dashed var(--line);
  background: var(--surface-soft);
  color: var(--muted) !important;
}
.rule-body { display: grid; gap: 8px; }
.rule-section-title {
  margin: 6px 0 0;
  font-weight: 700;
  color: var(--accent-2);
  letter-spacing: .01em;
}
.rule-list {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 6px;
}
.rule-list li { line-height: 1.5; }
.rule-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}
.rule-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 420px;
}
.rule-table th,
.rule-table td {
  border-bottom: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
.rule-table th {
  font-size: .82rem;
  letter-spacing: .02em;
  color: var(--accent-2);
  background: var(--surface-soft);
}
.rule-table tr:last-child td { border-bottom: none; }
.rule-details {
  margin-top: 0;
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows .32s ease, opacity .24s ease, margin-top .24s ease;
}
.rule-details-inner {
  min-height: 0;
  overflow: hidden;
}
.rule-card.expanded .rule-details {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 10px;
}
.rule-body.long { display: grid; gap: 8px; }
.expand-btn {
  margin-top: 8px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--text);
  border-radius: 10px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: .85rem;
  font-weight: 600;
}
.expand-btn:hover { border-color: var(--accent-2); }
mark { background: #fff0b3; border-radius: 4px; padding: 0 .1em; }

.empty-state { text-align: center; padding: 40px 16px; background: var(--surface); border: 1px dashed var(--line); border-radius: var(--radius); }
.empty-state button { margin-top: 12px; border: none; background: var(--accent-2); color: #fff; padding: 10px 14px; border-radius: 10px; cursor: pointer; }
.footer { padding: 22px 16px 36px; text-align: center; color: var(--muted); }

.quiz-modal {
  position: fixed;
  inset: 0;
  z-index: 70;
}
.quiz-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(7, 12, 24, .6);
}
.quiz-panel {
  position: relative;
  width: min(720px, calc(100% - 24px));
  margin: 8vh auto 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}
.quiz-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.quiz-head h3 { margin: 0; font-family: "Space Grotesk", sans-serif; }
.quiz-close {
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--text);
  border-radius: 10px;
  padding: 6px 10px;
  cursor: pointer;
}
.quiz-progress { margin: 12px 0 8px; color: var(--muted); font-size: .9rem; }
.quiz-question { margin: 0 0 12px; font-weight: 600; }
.quiz-options { display: grid; gap: 8px; }
.quiz-option {
  text-align: left;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
  cursor: pointer;
}
.quiz-option.correct { border-color: #22c55e; background: #e8fff0; color: #14532d; }
.quiz-option.wrong { border-color: #ef4444; background: #fff0f0; color: #7f1d1d; }
html[data-theme='dark'] .quiz-option.correct { background: #163b2a; color: #8af0ba; border-color: #2c8d5a; }
html[data-theme='dark'] .quiz-option.wrong { background: #422126; color: #ffb3bb; border-color: #a94855; }
.quiz-feedback { min-height: 1.4rem; margin: 12px 0 0; font-weight: 600; }
.quiz-next { margin-top: 10px; }

.reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
.reveal.show { opacity: 1; transform: translateY(0); }

@media (max-width: 880px) { .rules-grid { grid-template-columns: 1fr; } }
@media (max-width: 640px) {
  .stats { grid-template-columns: 1fr; }
  .list-head { flex-direction: column; align-items: flex-start; }
  .hero { padding-top: 50px; }
}
@media print {
  .toc-toggle, .toc-drawer, .toc-backdrop, .topline, .search-wrap, .chips, .actions, .footer, .expand-btn, .md-bg, .bg-orb, .quiz-modal { display: none !important; }
  .rule-details { display: block !important; opacity: 1 !important; grid-template-rows: 1fr !important; margin-top: 10px !important; }
}