:root {
  --c-cream: #F5F0E8;
  --c-ink: #1C2B36;
  --c-accent: #E84E1B;
  --c-gold: #C9A87C;
  --c-gray: #4A4A48;
  --c-light: #E3D5C3;
  --c-dark: #0E151C;
  --c-paper: #FAF6EF;
  --font-display: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Source Han Sans CN", "Microsoft YaHei", sans-serif;
  --font-body: "Songti SC", "Noto Serif CJK SC", "Source Han Serif CN", "SimSun", serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", "Cascadia Code", "Consolas", monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-md: 1.125rem;
  --text-lg: 1.5rem;
  --text-xl: 2rem;
  --text-2xl: 3rem;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --header-h: 64px;
  --content-w: 1200px;
  --content-w-narrow: 840px;
  --border-w: 1px;
  --shadow-lift: 4px 4px 0 rgba(28, 43, 54, 0.16);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--c-ink);
  background: var(--c-cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
picture,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: 0.02em;
}

h1 {
  font-size: var(--text-2xl);
}

h2 {
  font-size: var(--text-xl);
}

h3 {
  font-size: var(--text-lg);
}

h4 {
  font-size: var(--text-md);
}

::selection {
  background: var(--c-accent);
  color: var(--c-paper);
}

:focus-visible {
  outline: 3px solid var(--c-accent);
  outline-offset: 2px;
}

#main-content {
  width: 100%;
  min-height: 50vh;
}

.page-shell {
  width: min(var(--content-w), 100%);
  margin-inline: auto;
  padding-inline: var(--space-6);
  padding-block: var(--space-12) var(--space-24);
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-8);
}

.col-span-4 {
  grid-column: span 4;
}

.col-span-6 {
  grid-column: span 6;
}

.col-span-8 {
  grid-column: span 8;
}

.col-span-12 {
  grid-column: span 12;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625em 1.25em;
  border: var(--border-w) solid var(--c-ink);
  background: transparent;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-ink);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover,
.btn:focus-visible {
  background: var(--c-ink);
  color: var(--c-cream);
  border-color: var(--c-ink);
}

.btn-primary {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-paper);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--c-dark);
  border-color: var(--c-dark);
  color: var(--c-paper);
}

.btn-ghost {
  border-color: rgba(28, 43, 54, 0.35);
  color: var(--c-gray);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--c-accent);
  color: var(--c-accent);
  background: transparent;
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  padding-block: var(--space-6) 0;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-inline: var(--space-2);
  color: var(--c-gold);
}

.breadcrumb-link {
  color: var(--c-gray);
  transition: color 0.2s ease;
}

.breadcrumb-link:hover {
  color: var(--c-accent);
}

.breadcrumb-current {
  color: var(--c-ink);
  font-weight: 700;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(245, 240, 232, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: var(--border-w) solid rgba(28, 43, 54, 0.9);
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: left center;
  z-index: 2;
  pointer-events: none;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 2000;
  padding: 0.75em 1.25em;
  background: var(--c-ink);
  color: var(--c-cream);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: var(--space-2);
  color: var(--c-cream);
}

.header-inner {
  max-width: var(--content-w);
  margin-inline: auto;
  padding-inline: var(--space-6);
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.brand-block {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  flex-shrink: 0;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--c-ink);
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 2px solid var(--c-ink);
  background: var(--c-ink);
  color: var(--c-cream);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: -0.02em;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.25;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-base);
  letter-spacing: 0.04em;
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-accent);
  letter-spacing: 0.14em;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.25em 0.75em;
  border: var(--border-w) solid rgba(28, 43, 54, 0.22);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--c-gray);
  white-space: nowrap;
}

.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--c-accent);
  flex-shrink: 0;
}

.status-text {
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: 0.5em 0.65em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--c-ink);
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-accent);
}

.nav-label {
  font-size: inherit;
  line-height: inherit;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
}

.nav-link[aria-current="page"] {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45em 0.9em;
  border: var(--border-w) solid var(--c-ink);
  background: var(--c-paper);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-ink);
  line-height: 1;
}

.toggle-lines {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
}

.toggle-line {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.toggle-label {
  text-transform: uppercase;
}

.nav-toggle[aria-expanded="true"] .toggle-line:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .toggle-line:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.site-footer {
  background: var(--c-dark);
  color: var(--c-cream);
  margin-top: var(--space-24);
  position: relative;
}

.footer-inner {
  max-width: var(--content-w);
  margin-inline: auto;
  padding: var(--space-16) var(--space-6) var(--space-8);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-12);
  padding-bottom: var(--space-12);
}

.geo-rule {
  height: 8px;
  background: repeating-linear-gradient(
    135deg,
    var(--c-accent) 0 8px,
    transparent 8px 16px
  );
  opacity: 0.75;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-4);
}

.footer-mark {
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 2px solid var(--c-cream);
  color: var(--c-cream);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-base);
}

.footer-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  letter-spacing: 0.08em;
  color: var(--c-cream);
}

.footer-statement {
  font-size: var(--text-sm);
  line-height: 1.8;
  color: rgba(245, 240, 232, 0.68);
  max-width: 46ch;
}

.footer-col {
  display: flex;
  flex-direction: column;
}

.footer-contact {
  display: flex;
  flex-direction: column;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: var(--space-6);
}

.footer-links,
.contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: var(--text-sm);
}

.footer-links a {
  color: rgba(245, 240, 232, 0.82);
  transition: color 0.2s ease;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--c-accent);
}

.contact-list {
  color: rgba(245, 240, 232, 0.68);
}

.contact-list li {
  line-height: 1.6;
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  padding-top: var(--space-8);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: rgba(245, 240, 232, 0.55);
}

.footer-divider {
  width: 1px;
  height: 1em;
  background: rgba(245, 240, 232, 0.35);
}

.toc {
  font-size: var(--text-sm);
}

.toc-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  padding: var(--space-3) 0;
  border-bottom: var(--border-w) solid rgba(28, 43, 54, 0.15);
}

.toc-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--c-accent);
  flex-shrink: 0;
}

.toc-link {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--c-ink);
  transition: color 0.2s ease;
}

.toc-link:hover,
.toc-link:focus-visible {
  color: var(--c-accent);
}

.board {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

.board-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-6);
  border: var(--border-w) solid var(--c-ink);
  background: var(--c-paper);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.board-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 26px;
  height: 26px;
  border-top: 3px solid var(--c-accent);
  border-left: 3px solid var(--c-accent);
}

.board-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.board-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--c-accent);
  letter-spacing: 0.1em;
}

.board-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-md);
  line-height: 1.4;
}

.board-summary {
  font-size: var(--text-sm);
  color: var(--c-gray);
  line-height: 1.7;
}

.board-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  border-top: var(--border-w) dashed rgba(28, 43, 54, 0.35);
  padding-top: var(--space-3);
  margin-top: auto;
}

.data-tag {
  display: inline-block;
  padding: 0.18em 0.6em;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  border: var(--border-w) solid rgba(28, 43, 54, 0.35);
  color: var(--c-ink);
}

.data-tag--accent {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.image-frame {
  position: relative;
  min-height: 220px;
  overflow: hidden;
  border: var(--border-w) solid var(--c-ink);
  background:
    repeating-linear-gradient(
      45deg,
      rgba(28, 43, 54, 0) 0 10px,
      rgba(28, 43, 54, 0.05) 10px 11px
    ),
    var(--c-light);
}

.image-frame::before {
  content: "FIGURE-SLOT";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  color: var(--c-gray);
}

.image-frame--4x3 {
  aspect-ratio: 4 / 3;
}

.image-frame--16x9 {
  aspect-ratio: 16 / 9;
}

.image-frame--3x4 {
  aspect-ratio: 3 / 4;
}

.image-frame--fill {
  height: 100%;
  min-height: 0;
}

.image-frame > img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
  transition-delay: var(--reveal-delay, 0s);
}

html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

html.no-anim [data-reveal] {
  opacity: 1 !important;
  transform: none !important;
  transition: none !important;
}

@media (max-width: 1100px) {
  .status-text {
    display: none;
  }

  .nav-index {
    display: none;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 56px;
  }

  .page-shell {
    padding-block: var(--space-8) var(--space-12);
  }

  .content-grid {
    gap: var(--space-6);
  }

  .col-span-4,
  .col-span-6,
  .col-span-8,
  .col-span-12 {
    grid-column: span 12;
  }

  .header-inner {
    padding-inline: var(--space-4);
    gap: var(--space-4);
  }

  .brand-mark {
    width: 32px;
    height: 32px;
    font-size: var(--text-xs);
  }

  .brand-tag {
    display: none;
  }

  .status-badge {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--c-cream);
    border-bottom: var(--border-w) solid var(--c-ink);
    box-shadow: 0 16px 32px rgba(14, 21, 28, 0.18);
    padding: var(--space-4) var(--space-6) var(--space-6);
  }

  .site-nav[data-open] {
    display: block;
  }

  .site-nav .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
  }

  .site-nav .nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-3) var(--space-2);
    border-bottom: none;
    border-left: 2px solid transparent;
    font-size: var(--text-base);
  }

  .site-nav .nav-index {
    display: inline-block;
    width: 2ch;
    font-size: var(--text-xs);
    color: var(--c-accent);
  }

  .site-nav .nav-link[aria-current="page"] {
    background: rgba(232, 78, 27, 0.08);
    border-left-color: var(--c-accent);
  }

  .site-footer {
    margin-top: var(--space-12);
  }

  .footer-inner {
    padding-top: var(--space-12);
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .footer-divider {
    display: none;
  }
}

@media (max-width: 480px) {
  .brand-name {
    font-size: var(--text-sm);
  }

  .board {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .board-card:hover {
    transform: none;
    box-shadow: none;
  }
}