:root {
  color-scheme: dark;
  --black: #000;
  --panel: #080808;
  --panel-2: #101010;
  --white: #f4f4f1;
  --muted: #92928e;
  --dim: #5d5d59;
  --line: rgba(255, 255, 255, .14);
  --line-strong: rgba(255, 255, 255, .34);
  --mars: #e44b2d;
  --mars-deep: #9f3022;
  --sans: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Noto Sans SC", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

html { background: var(--black); scrollbar-color: #333 var(--black); }
body { background: var(--black); color: var(--white); font-family: var(--sans); }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 1px solid var(--white); outline-offset: 4px; }

.progress { height: 2px; background: var(--mars); }
.rail {
  width: 260px;
  padding: 30px 20px 20px;
  border-color: var(--line);
  background: #030303;
}
.brand { gap: 0; padding: 0 8px 25px; border-color: var(--line); }
.brand img { display: none; }
.brand b { color: var(--white); font-size: 18px; font-weight: 700; letter-spacing: .18em; }
.brand span span { margin-top: 8px; color: var(--muted); font: 9px/1.5 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.search { margin: 18px 0 10px; border-color: var(--line); background: #080808; }
.search span { color: var(--mars); }
.search input { color: var(--white); font: 11px var(--sans); }
.search input::placeholder { color: var(--dim); }
.toc { scrollbar-color: #2f2f2f transparent; }
.toc a { padding: 7px 9px; color: var(--muted); font-size: 11px; }
.toc a:hover, .toc a.active { background: rgba(255, 255, 255, .055); color: var(--white); }
.toc a.level-2 { margin-top: 8px; padding-left: 9px; color: #b6b6b1; font-family: var(--mono); font-size: 10px; }
.toc a.level-2::before { margin-right: 8px; color: var(--mars); content: "•"; }
.toc a.level-3 { padding-left: 22px; color: var(--muted); }
.toc a.level-4 { padding-left: 34px; color: var(--dim); font-size: 10px; }
.rail-links { gap: 7px; }
.rail-links a { min-height: 34px; align-items: center; border-color: var(--line); color: var(--muted); }
.rail-links a:hover { border-color: var(--line-strong); color: var(--white); }
.rail-foot { color: var(--dim); }

.main { margin-left: 260px; background: var(--black); }
.hero {
  position: relative;
  display: flex;
  min-height: 100svh;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  padding: 38px clamp(38px, 7vw, 100px) 30px;
  background: var(--black);
  color: var(--white);
  isolation: isolate;
}
.hero::after { display: none; }
.hero > * { position: relative; z-index: 2; }
.hero > picture { position: absolute; z-index: 0; inset: 0; pointer-events: none; }
.hero-mars {
  position: absolute;
  z-index: 0;
  right: clamp(24px, 3vw, 46px);
  bottom: 14px;
  width: clamp(300px, 27vw, 390px);
  height: auto;
  aspect-ratio: 1;
  border-radius: 50%;
  clip-path: circle(49.2% at 50% 50%);
  filter: contrast(1.14) saturate(1.08) brightness(.54) drop-shadow(0 0 2px rgba(255, 91, 66, .7)) drop-shadow(0 0 14px rgba(228, 75, 45, .18));
  user-select: none;
}
.hero-top { align-items: flex-start; }
.hero-logo { display: none; }
.hero-wordmark { font-size: 20px; font-weight: 700; letter-spacing: .2em; }
.hero-meta { color: var(--muted); font: 9px/1.7 var(--mono); letter-spacing: .11em; }
.hero-body { max-width: 860px; padding: clamp(64px, 11vh, 108px) 0 86px; }
.hero-kicker { margin: 0 0 20px; color: var(--mars); font: 10px var(--mono); letter-spacing: .16em; }
h1 { max-width: 860px; font-size: clamp(46px, 5vw, 72px); font-weight: 450; line-height: .98; }
h1 em { color: var(--muted); }
.mobile-break { display: none; }
.hero-copy { max-width: 610px; margin-top: 28px; color: #aaa9a5; font-size: 16px; line-height: 1.8; }
.hero-actions { margin-top: 31px; }
.button { min-height: 38px; padding: 0 15px; border-color: var(--line-strong); color: var(--white); }
.button:hover { border-color: var(--white); color: var(--white); }
.button-primary { border-color: var(--mars); background: var(--mars); color: var(--black); }
.button-primary:hover { border-color: var(--white); background: var(--white); color: var(--black); }
.hero-foot { display: flex; align-items: center; justify-content: space-between; gap: 24px; color: var(--muted); font: 9px var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.hero-foot strong { color: var(--white); font-weight: 500; }

.visual-index { padding: 104px clamp(38px, 7vw, 100px); border-color: var(--line); background: #030303; }
.visual-head { grid-template-columns: .5fr 1.5fr; gap: 48px; margin-bottom: 48px; }
.visual-head span { color: var(--mars); }
.visual-head h2 { color: var(--white); font-size: clamp(36px, 4.4vw, 60px); }
.diagram-grid { gap: 1px; border: 1px solid var(--line); background: var(--line); }
.diagram { min-height: 330px; border: 0; background: var(--black); }
.diagram-label { border-color: var(--line); color: var(--muted); }
.diagram-label strong { color: var(--mars); }
.flow-node, .cause-box, .economy-node { border-color: var(--line); background: var(--black); color: #c8c8c3; }
.flow-node b { color: var(--white); }
.flow-node small { color: var(--muted); }
.flow-node-acid { border-color: var(--mars); background: rgba(228, 75, 45, .11); }
.flow-arrow, .cause-middle { color: var(--mars); }
.stack-row { border-color: var(--line); }
.stack-row b { background: var(--panel-2); color: var(--mars); }
.stack-row span { color: var(--muted); }
.cause-box.hot { border-color: rgba(228, 75, 45, .58); background: rgba(228, 75, 45, .08); }
.cause-box.bad { border-color: rgba(228, 75, 45, .36); background: rgba(228, 75, 45, .05); }
.economy-node:nth-child(2), .economy-node:nth-child(5) { border-color: rgba(228, 75, 45, .55); }
.economy-caption { color: var(--muted); }
.timeline { border-color: var(--line); background: var(--line); }
.phase { background: var(--black); }
.phase b { color: var(--mars); }
.phase p { color: var(--muted); }

.doc-wrap { max-width: none; padding: 0 clamp(38px, 7vw, 100px) 90px; background: var(--black); }
.doc-state { position: sticky; z-index: 10; top: 0; padding: 16px 0; border-color: var(--line); background: rgba(0, 0, 0, .92); color: var(--muted); backdrop-filter: blur(14px); }
.doc-state strong { color: var(--mars); }
.content { max-width: 920px; padding-top: 72px; }
.content h1 { max-width: 880px; margin: 0 0 80px; color: var(--white); font-size: clamp(44px, 6vw, 82px); }
.content h2 { margin-top: 100px; padding-top: 28px; border-color: var(--line); color: var(--white); font-size: clamp(34px, 4.4vw, 58px); }
.content h3 { margin-top: 52px; color: #d2d2cd; font-size: 27px; }
.content h4 { color: var(--mars); }
.content p { color: #aaa9a5; font-size: 15px; line-height: 1.9; }
.content strong { color: var(--white); }
.content blockquote { border-color: var(--mars); background: var(--panel); color: #c5c5c0; }
.content ul, .content ol { color: #aaa9a5; }
.content li::marker { color: var(--mars); }
.content code { background: var(--panel-2); color: #d8a08f; }
.content pre { border: 1px solid var(--line); background: var(--panel); color: #d8a08f; }
.content hr { border-color: var(--line-strong); }
.content table { border-color: var(--white); color: #aaa9a5; }
.content th, .content td { border-color: var(--line); }
.content th { color: var(--mars); }
.content td:first-child { color: var(--white); }
.content a { color: #d8a08f; text-decoration: underline; text-decoration-color: rgba(216, 160, 143, .4); text-underline-offset: 3px; }
.footer { border-color: var(--white); color: var(--muted); }

.mobile-bar { border-color: var(--line); background: rgba(0, 0, 0, .94); color: var(--white); }
.mobile-brand img { display: none; }
.mobile-brand { font-weight: 700; letter-spacing: .13em; }
.menu { border-color: var(--line-strong); color: var(--white); }
.mobile-menu { background: #030303; }
.mobile-menu a { border-color: var(--line); color: var(--muted); }
.mobile-menu a:hover, .mobile-menu a.active { color: var(--white); }

@media (max-width: 1050px) {
  .hero-mars { right: 24px; width: 340px; }
}

@media (max-width: 900px) {
  .rail { width: 220px; }
  .main { margin-left: 220px; }
  .hero-body { padding-top: 74px; }
  .hero-mars { width: 310px; opacity: .9; }
}

@media (max-width: 700px) {
  .main { margin-left: 0; }
  .mobile-bar { height: 62px; }
  .mobile-menu { display: block; inset: 62px 0 0; }
  .mobile-menu[hidden] { display: none; }
  .hero { height: 100svh; min-height: 100svh; padding: 92px 20px 24px; }
  .hero-body { padding: 64px 0 96px; }
  .hero-meta { max-width: 145px; }
  .hero-mars { right: -38px; bottom: 48px; width: min(64vw, 250px); opacity: .78; }
  h1 { font-size: 40px; line-height: 1; }
  .mobile-break { display: initial; }
  .hero-copy { font-size: 14px; }
  .hero-actions { gap: 8px; }
  .button { font-size: 9px; }
  .hero-foot { align-items: flex-start; flex-direction: column; gap: 7px; }
  .visual-index { padding: 82px 20px; }
  .visual-head { display: block; }
  .visual-head h2 { margin-top: 18px; font-size: 40px; }
  .diagram { padding: 18px; }
  .flow { gap: 9px; }
  .flow-node { min-width: 112px; }
  .timeline { grid-template-columns: 1fr; }
  .doc-wrap { padding: 0 20px 60px; }
  .doc-state { top: 62px; }
  .content { padding-top: 52px; }
  .content h1 { font-size: 44px; }
  .content h2 { margin-top: 72px; font-size: 38px; }
  .content h3 { font-size: 24px; }
  .content p { font-size: 14px; }
}

@media print {
  .rail, .mobile-bar, .mobile-menu, .progress, .hero-actions { display: none !important; }
  .main { margin: 0; }
  body, .hero, .visual-index, .doc-wrap { background: #fff; color: #111; }
  .hero { min-height: auto; }
  .hero-mars { display: none; }
  .content p, .content ul, .content ol, .content table { color: #333; }
}