@import url('tokens.css');

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

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--font);
  font-size: var(--text-base);
  color: var(--black);
  background: var(--white);
  text-transform: uppercase;
  letter-spacing: var(--tracking-normal);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--duration) var(--ease), color var(--duration) var(--ease);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 1;
  transition: opacity var(--duration) var(--ease);
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
    linear-gradient(var(--grid-color-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color-major) 1px, transparent 1px);
  background-size:
    var(--grid-unit) var(--grid-unit),
    var(--grid-unit) var(--grid-unit),
    calc(var(--grid-unit) * 5) calc(var(--grid-unit) * 5),
    calc(var(--grid-unit) * 5) calc(var(--grid-unit) * 5);
}

body.grid-hidden::before { opacity: 0; }
body.nav-open { overflow: hidden; }

main, .site-header, .site-footer { position: relative; z-index: 1; }

a { color: inherit; text-decoration: none; transition: opacity var(--duration-fast) var(--ease); }
a:hover { opacity: 0.5; }
img { display: block; max-width: 100%; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }
main { flex: 1; }

.label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-ultra);
  color: var(--gray-600);
}
.caption { font-size: var(--text-sm); letter-spacing: var(--tracking-wide); color: var(--gray-600); }

[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--duration-slow) var(--ease), transform var(--duration-slow) var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }
[data-reveal-delay="1"] { transition-delay: 0.08s; }
[data-reveal-delay="2"] { transition-delay: 0.16s; }
[data-reveal-delay="3"] { transition-delay: 0.24s; }

html[lang="zh-CN"] body { text-transform: none; letter-spacing: 0.04em; }

.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  background: var(--white);
  border-bottom: var(--line);
}
.header-grid {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  height: 100%;
  padding: 0 var(--gutter);
  max-width: var(--max-width);
  margin: 0 auto;
}
.header-left { display: flex; align-items: center; gap: 6px; }
.header-controls { display: flex; gap: 4px; }

.theme-toggle, .grid-toggle, .lang-switch {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  background: none;
  border: var(--line);
  color: var(--black);
  padding: 6px 10px;
  text-transform: uppercase;
  transition: background var(--duration-fast), color var(--duration-fast);
}
.theme-toggle:hover, .grid-toggle:hover, .lang-switch:hover {
  background: var(--black); color: var(--white); opacity: 1;
}
.theme-toggle[aria-pressed="true"], .grid-toggle.is-active {
  background: var(--black); color: var(--white);
}

.site-logo {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-wide);
  margin-left: 8px;
  padding-left: 12px;
  border-left: var(--line);
}
.site-logo:hover { opacity: 1; }

.site-nav { display: flex; align-items: center; gap: var(--space-sm); justify-self: center; }
.nav-list { display: flex; gap: 2px; flex-wrap: wrap; justify-content: center; }
.nav-link {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  color: var(--gray-600);
  padding: 6px 8px;
  border: 1px solid transparent;
  display: flex; align-items: center; gap: 4px;
}
.nav-link:hover, .nav-link.is-active { color: var(--black); opacity: 1; border-color: var(--gray-200); }
.nav-num { color: var(--gray-400); font-size: 0.55rem; }

.header-actions { display: none; align-items: center; gap: 6px; }
.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; padding: 6px;
}
.nav-toggle span { display: block; width: 22px; height: 1px; background: var(--black); transition: transform var(--duration); }
.nav-toggle.is-open span:first-child { transform: rotate(45deg) translate(4px, 4px); }
.nav-toggle.is-open span:last-child { transform: rotate(-45deg) translate(4px, -4px); }

.nav-drawer {
  position: fixed; inset: 0; top: var(--header-h);
  background: var(--white); z-index: 99;
  padding: var(--space-md) var(--gutter);
  transform: translateX(100%); transition: transform var(--duration) var(--ease);
}
.nav-drawer.is-open { transform: translateX(0); }
.drawer-list { display: flex; flex-direction: column; gap: 4px; }
.drawer-link {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  padding: 12px 0;
  border-bottom: var(--line);
  display: block;
}
.drawer-link.is-active { border-bottom-color: var(--black); }
.lang-switch--drawer { margin-top: var(--space-md); width: 100%; padding: 12px; }

@media (max-width: 960px) {
  .site-nav { display: none; }
  .header-actions { display: flex; }
  .nav-toggle { display: flex; }
  .site-logo { display: none; }
}

.site-footer {
  border-top: var(--line-strong);
  margin-top: var(--space-xl);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) var(--gutter);
  letter-spacing: var(--tracking-wide);
  line-height: 1.9;
}
.footer-label { color: var(--gray-400); margin-bottom: var(--space-xs); }
.footer-col--end { text-align: right; }
.footer-note { color: var(--gray-400); margin-top: 4px; }
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-col--end { text-align: left; }
}

.page-hero {
  padding: calc(var(--header-h) + var(--space-lg)) var(--gutter) var(--space-md);
  border-bottom: var(--line-strong);
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}
.page-hero h1 {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  letter-spacing: var(--tracking-tight);
  line-height: 1;
  margin-top: var(--space-sm);
}
.page-meta {
  margin-top: var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--gray-600);
}

.section-block {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--gutter);
}
.section-head {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: var(--space-md); margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: var(--line);
  flex-wrap: wrap;
}
.section-head h2 {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  letter-spacing: var(--tracking-normal);
}

.hero-tech {
  min-height: calc(100vh - var(--header-h));
  padding: calc(var(--header-h) + var(--space-md)) var(--gutter) var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}
.hero-copy { display: flex; flex-direction: column; justify-content: center; }
.hero-copy h1 {
  font-family: var(--font-mono);
  font-size: var(--text-hero);
  line-height: 0.95;
  letter-spacing: var(--tracking-tight);
  margin: var(--space-sm) 0;
}
.hero-copy .hero-sub {
  font-size: var(--text-sm);
  color: var(--gray-600);
  line-height: 1.8;
  max-width: 420px;
  letter-spacing: var(--tracking-wide);
}
.hero-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: var(--space-md); }
.hero-tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 6px 10px;
  border: var(--line);
}

.hero-ortho {
  position: relative;
  border: var(--line-strong);
  background: var(--gray-100);
  min-height: 420px;
  overflow: hidden;
}
.hero-ortho[data-coord-track] { cursor: crosshair; }

.coord-readout {
  position: absolute; top: 12px; left: 12px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 4px 8px;
  border: var(--line);
  background: var(--white);
  z-index: 2;
}
.coord-crosshair {
  position: absolute;
  width: 24px; height: 24px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--duration-fast);
  z-index: 2;
}
.coord-crosshair::before, .coord-crosshair::after {
  content: '';
  position: absolute;
  background: var(--black);
}
.coord-crosshair::before { width: 1px; height: 100%; left: 50%; }
.coord-crosshair::after { height: 1px; width: 100%; top: 50%; }

.ortho-drawing {
  width: 100%; height: 100%;
  min-height: 420px;
  display: flex; align-items: center; justify-content: center;
}
.ortho-drawing img {
  max-height: 75%;
  filter: grayscale(100%) contrast(1.1);
}
.ortho-placeholder {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--gray-400);
}

.dim-line-h, .dim-line-v {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.55rem;
  color: var(--gray-600);
}
.dim-line-h {
  bottom: 24px; left: 50%; transform: translateX(-50%);
  padding-top: 8px; border-top: 1px solid var(--black);
  min-width: 120px; text-align: center;
}
.dim-line-v {
  right: 20px; top: 50%; transform: translateY(-50%);
  padding-left: 8px; border-left: 1px solid var(--black);
  writing-mode: vertical-rl;
}
.corner-mark { position: absolute; width: 12px; height: 12px; border-color: var(--black); border-style: solid; border-width: 0; }
.corner-mark--tl { top: 8px; left: 8px; border-top-width: 1px; border-left-width: 1px; }
.corner-mark--tr { top: 8px; right: 8px; border-top-width: 1px; border-right-width: 1px; }
.corner-mark--bl { bottom: 8px; left: 8px; border-bottom-width: 1px; border-left-width: 1px; }
.corner-mark--br { bottom: 8px; right: 8px; border-bottom-width: 1px; border-right-width: 1px; }

@media (max-width: 900px) {
  .hero-tech { grid-template-columns: 1fr; }
  .hero-ortho { min-height: 300px; }
}

.spec-ticker {
  border-top: var(--line); border-bottom: var(--line);
  overflow: hidden; padding: 10px 0;
  background: var(--white);
}
.spec-ticker-track { display: flex; width: max-content; animation: ticker 35s linear infinite; }
.spec-ticker-item {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--gray-600);
  white-space: nowrap;
  padding: 0 var(--space-lg);
}
.spec-ticker-item::after { content: ' / '; color: var(--gray-400); margin-left: var(--space-lg); }
@keyframes ticker { to { transform: translateX(-50%); } }

.principles-preview {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border: var(--line-strong);
}
.principle-cell { border-right: var(--line); border-bottom: var(--line); padding: var(--space-sm); min-height: 96px; transition: background var(--duration-fast); position: relative; color: inherit; display: block; }
.principle-cell:hover { opacity: 1; }
.principle-cell:nth-child(5n) { border-right: none; }
.principle-cell:hover { background: var(--gray-100); }
.principle-cell .num { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--gray-400); margin-bottom: 8px; }
.principle-cell .title { font-family: var(--font-mono); font-size: var(--text-sm); line-height: 1.4; }
.principle-cell .hover-line {
  position: absolute; bottom: 0; left: 0; width: 0; height: 2px;
  background: var(--black); transition: width var(--duration);
}
.principle-cell:hover .hover-line { width: 100%; }

@media (max-width: 768px) {
  .principles-preview { grid-template-columns: repeat(2, 1fr); }
  .principle-cell:nth-child(5n) { border-right: var(--line); }
  .principle-cell:nth-child(2n) { border-right: none; }
}

.principles-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--gutter);
}
.principle-index {
  position: sticky; top: calc(var(--header-h) + 20px);
  border: var(--line); padding: var(--space-sm);
}
.principle-index button {
  display: block; width: 100%;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-align: left;
  padding: 8px 10px;
  border: none; background: none;
  color: var(--gray-600);
  border-left: 2px solid transparent;
}
.principle-index button:hover, .principle-index button.is-active {
  color: var(--black); border-left-color: var(--black);
}
.principles-list { border-top: var(--line-strong); }
.principle-row { border-bottom: var(--line); }
.principle-head {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  gap: var(--space-sm);
  align-items: center;
  padding: var(--space-sm) 0;
  cursor: pointer;
}
.principle-head:hover { background: var(--gray-100); }
.principle-head .num { font-family: var(--font-mono); color: var(--gray-400); }
.principle-head .title { font-family: var(--font-mono); font-size: var(--text-lg); }
.principle-head .toggle { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--gray-400); transition: transform var(--duration); }
.principle-row.is-open .principle-head .toggle { transform: rotate(45deg); }
.principle-body {
  max-height: 0; overflow: hidden;
  transition: max-height var(--duration) var(--ease);
  padding: 0 0 0 48px;
}
.principle-row.is-open .principle-body { max-height: 180px; padding-bottom: var(--space-sm); }
.principle-body p { font-size: var(--text-sm); color: var(--gray-600); line-height: 1.8; text-transform: none; }

@media (max-width: 768px) {
  .principles-layout { grid-template-columns: 1fr; }
  .principle-index { position: static; display: flex; flex-wrap: wrap; gap: 4px; }
  .principle-index button { width: auto; flex: 1 1 45%; }
}

.archive-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--space-sm); }
.archive-card {
  grid-column: span 4;
  border: var(--line-strong);
  background: var(--white);
  transition: box-shadow var(--duration);
}
.archive-card:hover { box-shadow: 4px 4px 0 var(--black); }

.ortho-panel { position: relative; }

.ortho-tabs { display: flex; border-bottom: var(--line); }
.ortho-tab {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.55rem;
  padding: 8px 4px;
  background: var(--gray-100);
  border: none;
  border-right: var(--line);
  color: var(--gray-600);
}
.ortho-tab:last-child { border-right: none; }
.ortho-tab.is-active { background: var(--white); color: var(--black); }
.ortho-frame {
  aspect-ratio: 4/3;
  display: flex; align-items: center; justify-content: center;
  background: var(--gray-100);
  overflow: hidden;
}
.ortho-frame img {
  width: 100%; height: 100%;
  object-fit: contain;
  filter: grayscale(100%);
  padding: 16px;
  transition: filter var(--duration), transform var(--duration);
}
.archive-card:hover .ortho-frame img { filter: grayscale(0%); }
.ortho-panel[data-view="top"] .ortho-frame img { transform: scale(0.82); }
.ortho-panel[data-view="side"] .ortho-frame img { transform: perspective(500px) rotateY(-20deg) scale(0.88); }

.archive-meta {
  padding: var(--space-sm);
  border-top: var(--line);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}
.archive-meta h3 { font-family: var(--font-mono); font-size: var(--text-sm); }
.archive-ref { font-family: var(--font-mono); font-size: 0.55rem; color: var(--gray-400); }
.archive-spec-line {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 0.55rem;
  color: var(--gray-600);
  border-top: 1px dashed var(--gray-200);
  padding-top: 4px;
}

.archive-grid .archive-card:nth-child(1) { grid-column: span 5; }
.archive-grid .archive-card:nth-child(2) { grid-column: span 4; margin-top: var(--space-md); }
.archive-grid .archive-card:nth-child(3) { grid-column: span 3; }
@media (max-width: 900px) {
  .archive-grid .archive-card { grid-column: span 6 !important; margin-top: 0 !important; }
}
@media (max-width: 600px) {
  .archive-grid .archive-card { grid-column: span 12 !important; }
}

.spec-table-wrap { border: var(--line-strong); overflow-x: auto; }
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}
.spec-table th, .spec-table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: var(--line);
  border-right: var(--line);
}
.spec-table th { background: var(--gray-100); color: var(--gray-600); font-weight: 400; }
.spec-table th:last-child, .spec-table td:last-child { border-right: none; }
.spec-table tbody tr { cursor: pointer; transition: background var(--duration-fast); }
.spec-table tbody tr:hover { background: var(--gray-100); }
.spec-table tbody tr.is-selected { background: var(--black); color: var(--white); }

.filter-row { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: var(--space-md); }
.filter-btn {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 8px 14px;
  border: var(--line);
  background: var(--white);
  color: var(--gray-600);
}
.filter-btn.is-active, .filter-btn:hover {
  background: var(--black); color: var(--white); opacity: 1;
}

.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 12px 20px;
  border: var(--line-strong);
  background: var(--white);
  color: var(--black);
}
.btn:hover { opacity: 1; background: var(--black); color: var(--white); }
.btn--filled { background: var(--black); color: var(--white); }
.btn--filled:hover { background: var(--white); color: var(--black); }

.spec-release {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--gutter);
}
.spec-release-main { grid-column: span 7; }
.spec-release-side { grid-column: span 5; border: var(--line-strong); padding: var(--space-sm); }
.drop-countdown { font-family: var(--font-mono); font-size: var(--text-lg); margin: var(--space-sm) 0; }
.spec-sheet { margin-top: var(--space-md); display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-sm); }
.spec-sheet-item { border: var(--line); padding: var(--space-sm); }
@media (max-width: 768px) {
  .spec-release-main, .spec-release-side { grid-column: span 12; }
  .spec-sheet { grid-template-columns: 1fr; }
}

.about-doc {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--gutter);
}
.about-id { grid-column: span 4; border: var(--line-strong); aspect-ratio: 3/4; overflow: hidden; background: var(--gray-100); }
.about-id img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(100%); }
.about-sheet { grid-column: span 8; }
.about-sheet h2 {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: var(--line-strong);
}
.about-sheet p { font-size: var(--text-sm); color: var(--gray-800); line-height: 2; margin-bottom: var(--space-sm); }
.about-data {
  grid-column: span 12;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: var(--line-strong);
  margin-top: var(--space-md);
}
.about-data-cell { padding: var(--space-sm); border-right: var(--line); }
.about-data-cell:last-child { border-right: none; }
@media (max-width: 768px) {
  .about-id, .about-sheet { grid-column: span 12; }
  .about-data { grid-template-columns: 1fr; }
  .about-data-cell { border-right: none; border-bottom: var(--line); }
}

.spec-release-side .coord-readout { z-index: 3; }
.spec-release-side .ortho-panel { border: none; }
.link-arrow { font-family: var(--font-mono); font-size: var(--text-xs); border-bottom: var(--line-strong); padding-bottom: 2px; }
.link-arrow:hover { opacity: 1; }