:root {
  --bg: #111111;
  --bg-soft: #171717;
  --panel: #1d1b1a;
  --paper: #f2ece4;
  --paper-soft: #e6ded3;
  --ink: #141414;
  --line: rgba(255, 255, 255, 0.16);
  --line-strong: rgba(255, 255, 255, 0.28);
  --text: #f4efe8;
  --muted: rgba(244, 239, 232, 0.66);
  --accent: #7f2f2f;
  --accent-soft: rgba(127, 47, 47, 0.16);
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.28);
}

body.light-mode {
  --bg: #efe8de;
  --bg-soft: #e7dfd3;
  --panel: #f6f0e7;
  --paper: #ffffff;
  --paper-soft: #f5eee4;
  --ink: #171717;
  --line: rgba(23, 23, 23, 0.12);
  --line-strong: rgba(23, 23, 23, 0.22);
  --text: #171717;
  --muted: rgba(23, 23, 23, 0.68);
  --accent: #8d3d38;
  --accent-soft: rgba(141, 61, 56, 0.11);
  --shadow: 0 20px 60px rgba(28, 22, 18, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent 18%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
  color: var(--text);
  font-family: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  transition: background 260ms ease, color 260ms ease;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, transparent 0, transparent calc(50% - 1px), var(--line) calc(50% - 1px), var(--line) calc(50% + 1px), transparent calc(50% + 1px)),
    linear-gradient(180deg, transparent 0, transparent 88px, var(--line) 88px, var(--line) 89px, transparent 89px);
  opacity: 0.5;
}

body::after {
  content: '';
  position: fixed;
  inset: 28px;
  border: 1px solid var(--line);
  pointer-events: none;
}

button,
a {
  color: inherit;
}

.page-shell {
  width: min(1320px, calc(100% - 48px));
  margin: 0 auto;
}

.topbar,
.section,
.footer {
  position: relative;
  z-index: 1;
}

.topbar {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 0 18px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--bg) 82%, transparent 18%), color-mix(in srgb, var(--bg) 58%, transparent 42%));
  backdrop-filter: blur(14px);
  z-index: 8;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.brand-mark {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-soft);
}

.brand-text {
  font-weight: 700;
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a,
.mode-toggle,
.footer {
  font-size: 0.92rem;
  text-decoration: none;
  color: var(--muted);
}

.mode-toggle {
  border: 1px solid var(--line);
  background: transparent;
  padding: 10px 14px;
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.mode-toggle:hover,
.nav-links a:hover {
  color: var(--text);
}

.mode-toggle:hover {
  border-color: var(--line-strong);
  background: var(--accent-soft);
}

.hero {
  padding: 42px 0 72px;
}

.hero-ledger {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.ledger-item {
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
}

.ledger-item span,
.closing-signoff span {
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  color: var(--muted);
}

.ledger-item strong {
  display: block;
  margin-top: 14px;
  font-size: 1rem;
  line-height: 1.6;
  font-weight: 600;
}

.hero-meta,
.section-head,
.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: baseline;
}

.kicker,
.issue,
.stage-kicker,
.system-card span {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.74rem;
  color: var(--muted);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
  gap: 36px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.hero-copy h1,
.section-head h2,
.closing-panel h2,
.work-stage h3 {
  font-family: 'Noto Serif SC', 'Songti SC', serif;
  letter-spacing: -0.03em;
  font-weight: 700;
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(3.5rem, 8vw, 7rem);
  line-height: 1.03;
  max-width: 11ch;
}

.hero-text,
.statement-grid p,
.system-card p,
.closing-panel p,
.work-stage p,
.section-caption,
.work-item small,
.hero-note p {
  color: var(--muted);
  line-height: 1.8;
}

.hero-text {
  margin: 28px 0 0;
  max-width: 46rem;
  font-size: 1.06rem;
}

.hero-note {
  align-self: end;
  padding: 22px 0 0 20px;
  border-left: 1px solid var(--line);
}

.section {
  padding: 72px 0;
}

.section-head {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.section-head h2,
.closing-panel h2 {
  margin: 10px 0 0;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1.1;
}

.statement-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-top: 28px;
}

.split-head {
  align-items: end;
}

.works-layout {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1.1fr);
  gap: 28px;
  margin-top: 30px;
}

.work-list {
  display: grid;
  gap: 12px;
}

.work-item {
  width: 100%;
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  text-align: left;
  padding: 18px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.work-item:hover,
.work-item.is-active {
  transform: translateX(4px);
  border-color: var(--line-strong);
  background: var(--accent-soft);
}

.work-item.is-active .work-number,
.work-item.is-active small {
  color: var(--text);
}

.work-number {
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.14em;
}

.work-item strong {
  display: block;
  font-size: 1.12rem;
  margin-bottom: 6px;
}

.work-stage {
  min-height: 100%;
}

.stage-card,
.system-card,
.closing-panel {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.stage-card {
  position: relative;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 34px;
  overflow: hidden;
  background:
    linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.06) 100%),
    linear-gradient(135deg, rgba(255,255,255,0.02), transparent 48%),
    linear-gradient(180deg, var(--panel), color-mix(in srgb, var(--panel) 80%, black 20%));
}

.stage-card::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, 0.04) 100%);
  opacity: 0.5;
}

.stage-card.is-refreshing {
  animation: stageRefresh 320ms ease;
}

.stage-index {
  font-size: clamp(4.2rem, 8vw, 8rem);
  line-height: 0.92;
  margin: 20px 0 12px;
  color: color-mix(in srgb, var(--accent) 72%, var(--text) 28%);
}

.work-stage h3 {
  font-size: clamp(1.8rem, 3vw, 3rem);
  margin: 0 0 14px;
}

.system-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 28px;
}

.system-card {
  padding: 22px;
}

.system-card strong {
  display: block;
  margin: 18px 0 10px;
  font-size: 1.2rem;
  line-height: 1.35;
}

.closing-panel {
  padding: 36px;
  background:
    linear-gradient(0deg, rgba(127, 47, 47, 0.08), rgba(127, 47, 47, 0.08)),
    linear-gradient(180deg, var(--paper-soft), var(--paper));
  color: var(--ink);
  border-color: rgba(0, 0, 0, 0.08);
}

.closing-panel .kicker,
.closing-panel p {
  color: rgba(20, 20, 20, 0.7);
}

.closing-signoff {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid rgba(20, 20, 20, 0.12);
}

.footer {
  padding: 22px 0 42px;
  border-top: 1px solid var(--line);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 650ms ease, transform 650ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes stageRefresh {
  0% {
    transform: translateY(8px);
    opacity: 0.86;
  }
  100% {
    transform: translateY(0);
    opacity: 1;
  }
}

@media (max-width: 1100px) {
  .topbar,
  .hero-meta,
  .section-head,
  .works-layout,
  .hero-grid,
  .hero-ledger,
  .statement-grid,
  .system-grid,
  .footer {
    grid-template-columns: 1fr !important;
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-copy h1 {
    max-width: none;
  }

  .hero-note {
    border-left: none;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 18px;
  }

  .system-grid {
    display: grid;
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  body::after {
    inset: 14px;
  }

  .page-shell {
    width: min(100% - 24px, 1320px);
  }

  .nav-links {
    display: none;
  }

  .hero {
    padding-top: 20px;
  }

  .hero-copy h1 {
    font-size: clamp(2.6rem, 13vw, 4.4rem);
  }

  .section {
    padding: 54px 0;
  }

  .work-item {
    grid-template-columns: 40px 1fr;
    padding: 16px;
  }

  .stage-card,
  .closing-panel {
    padding: 24px;
  }

  .closing-signoff {
    flex-direction: column;
  }
}