/* ============================================================
   Ryan Wong — personal site
   Direction: engineering field notebook. Paper & ink, hairline
   rules, mono annotations, one signal-orange accent. Bilingual
   (EN display serif / ZH system sans), light + dark themes.
   ============================================================ */

/* ---------- Fonts ---------- */
@font-face {
  font-family: 'Cormorant';
  src: url('assets/fonts/cormorant-500.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Cormorant';
  src: url('assets/fonts/cormorant-500-italic.woff2') format('woff2');
  font-weight: 500;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: 'Cormorant';
  src: url('assets/fonts/cormorant-600.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Manrope';
  src: url('assets/fonts/manrope-400.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Manrope';
  src: url('assets/fonts/manrope-600.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('assets/fonts/jetbrains-mono-400.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('assets/fonts/jetbrains-mono-600.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

/* ---------- Tokens ---------- */
:root {
  --bg: #f5f2ea;
  --bg-raised: #fbf9f3;
  --bg-dim: #eeeadd;
  --ink: #20242e;
  --ink-soft: #4d5160;
  --muted: #7c7768;
  --line: #ddd6c6;
  --line-strong: #c9c1ad;
  --accent: #bc4a17;
  --accent-strong: #9c3c10;
  --accent-soft: rgba(188, 74, 23, 0.09);
  --shadow: 0 14px 40px rgba(32, 36, 46, 0.09);
  --dot: rgba(32, 36, 46, 0.13);

  --font-display: 'Cormorant', Georgia, 'Times New Roman', serif;
  --font-body: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-zh: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, 'Courier New', monospace;

  --topbar-h: 64px;
  --radius: 2px;
  --content: 1120px;
  --gutter: clamp(20px, 5vw, 48px);
  --speed: 220ms;
}

html[data-theme='dark'] {
  --bg: #15171e;
  --bg-raised: #1b1e27;
  --bg-dim: #101218;
  --ink: #e9e6dc;
  --ink-soft: #c2bfb4;
  --muted: #8e8a7d;
  --line: #2b2f3a;
  --line-strong: #3b4050;
  --accent: #e0793f;
  --accent-strong: #f08d55;
  --accent-soft: rgba(224, 121, 63, 0.12);
  --shadow: 0 16px 44px rgba(0, 0, 0, 0.45);
  --dot: rgba(233, 230, 220, 0.1);
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--topbar-h) + 16px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.no-scroll { overflow: hidden; }

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

a { color: inherit; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }

::selection { background: var(--accent); color: #fff; }

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

.icon { fill: currentColor; flex: none; }

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-decoration: none;
  transform: translateY(-260%);
  transition: transform 160ms ease;
}
.skip-link:focus { transform: translateY(0); }

/* ZH typography: system sans for display sizes */
html[lang='zh-CN'] body,
html[lang='zh-CN'] .section-title,
html[lang='zh-CN'] .case-title,
html[lang='zh-CN'] .archive-title,
html[lang='zh-CN'] .about-card h3,
html[lang='zh-CN'] .timeline-org,
html[lang='zh-CN'] .music-band-title,
html[lang='zh-CN'] .mobile-menu a,
html[lang='zh-CN'] .timeline-next-dest {
  font-family: var(--font-zh);
}
html[lang='zh-CN'] .section-title,
html[lang='zh-CN'] .case-title { letter-spacing: 0.01em; font-weight: 600; }
html[lang='zh-CN'] body { line-height: 1.75; }
/* The hero name stays latin display even in ZH */
.hero-title { font-family: var(--font-display) !important; }

/* ---------- Topbar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  margin-right: auto;
  white-space: nowrap;
}

.brand-mark {
  align-self: center;
  width: 9px;
  height: 9px;
  background: var(--accent);
  box-shadow: 14px 0 0 -3px var(--line-strong);
  margin-right: 8px;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: 0.01em;
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  transform: translateY(-1px);
}

.topnav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.topnav-list a {
  display: block;
  padding: 7px 12px;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--ink-soft);
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: color var(--speed) ease, border-color var(--speed) ease;
}

.topnav-list a:hover { color: var(--ink); border-color: var(--line-strong); }
.topnav-list a.is-current {
  color: var(--accent);
  border-color: var(--accent);
}

.topbar-tools {
  display: flex;
  align-items: center;
  gap: 14px;
}

.language-switcher {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.lang-divider { color: var(--line-strong); }

.language-option {
  padding: 4px 2px;
  letter-spacing: 0.04em;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  transition: color var(--speed) ease;
}
.language-option:hover { color: var(--ink); }
.language-option.is-active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink-soft);
  transition: color var(--speed) ease, border-color var(--speed) ease;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.theme-toggle .icon-moon { display: none; }
html[data-theme='dark'] .theme-toggle .icon-moon { display: block; }
html[data-theme='dark'] .theme-toggle .icon-sun { display: none; }

.menu-toggle {
  display: none;
  width: 34px;
  height: 32px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}
.menu-toggle-box {
  display: grid;
  gap: 5px;
  width: 15px;
}
.menu-toggle-box i {
  height: 2px;
  background: var(--ink);
  transition: transform var(--speed) ease;
}
.menu-toggle[aria-expanded='true'] .menu-toggle-box i:first-child { transform: translateY(3.5px) rotate(45deg); }
.menu-toggle[aria-expanded='true'] .menu-toggle-box i:last-child { transform: translateY(-3.5px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  inset: var(--topbar-h) 0 auto 0;
  z-index: 90;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  padding: 12px var(--gutter) 22px;
  box-shadow: var(--shadow);
}
.mobile-menu a {
  display: block;
  padding: 13px 2px;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}
html[lang='zh-CN'] .mobile-menu a { font-family: var(--font-zh); font-size: 20px; }
.mobile-menu a:active { color: var(--accent); }
.mobile-menu li:last-child a { border-bottom: 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  transition: background var(--speed) ease, color var(--speed) ease, border-color var(--speed) ease, transform var(--speed) ease;
}
.btn:active { transform: translateY(1px); }

.btn-solid {
  background: var(--ink);
  color: var(--bg);
}
.btn-solid:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-ghost .icon-ext { color: var(--muted); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  background-image: radial-gradient(var(--dot) 1px, transparent 1.4px);
  background-size: 26px 26px;
}

.hero-inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: clamp(56px, 9vh, 104px) var(--gutter) clamp(64px, 10vh, 96px);
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
  min-height: calc(100svh - var(--topbar-h));
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
}
.hero-eyebrow .tick {
  width: 8px;
  height: 8px;
  background: var(--accent);
  flex: none;
}

.hero-title {
  margin: 18px 0 20px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(56px, 9.5vw, 118px);
  line-height: 0.95;
  letter-spacing: -0.015em;
}

.hero-subtitle {
  max-width: 54ch;
  font-size: clamp(15.5px, 1.35vw, 17.5px);
  color: var(--ink-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.hero-status {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.status-cell {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.status-label {
  color: var(--ink);
  border: 1px solid var(--line-strong);
  padding: 2px 8px;
  border-radius: var(--radius);
}
.status-clock { display: inline-flex; align-items: center; gap: 7px; }
.status-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}
.status-open { color: var(--ink-soft); }

/* Arm stage */
.hero-figure { margin: 0; min-width: 0; }

.arm-stage {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 560px;
  margin-left: auto;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--bg-raised);
  overflow: hidden;
  touch-action: none;
  cursor: crosshair;
}

#arm-canvas { width: 100%; height: 100%; }

.arm-corner {
  position: absolute;
  width: 14px;
  height: 14px;
  border: 0 solid var(--accent);
}
.arm-corner-tl { top: -1px; left: -1px; border-top-width: 2px; border-left-width: 2px; }
.arm-corner-br { bottom: -1px; right: -1px; border-bottom-width: 2px; border-right-width: 2px; }

.hero-figcaption {
  display: flex;
  gap: 12px;
  align-items: baseline;
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}
.fig-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--accent);
  white-space: nowrap;
}

.hero-scroll {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
}
.hero-scroll .icon { animation: nudge 2s ease-in-out infinite; }
@keyframes nudge {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

/* ---------- Sections ---------- */
.section {
  border-bottom: 1px solid var(--line);
  padding: clamp(64px, 10vh, 112px) 0;
}

.section-inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section-head {
  display: flex;
  gap: clamp(16px, 3vw, 40px);
  align-items: baseline;
  margin-bottom: clamp(36px, 6vh, 56px);
}

.section-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
  padding-top: 0.5em;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(34px, 4.6vw, 54px);
  line-height: 1.05;
  letter-spacing: -0.01em;
}

.section-note {
  margin-top: 10px;
  max-width: 60ch;
  color: var(--muted);
  font-size: 15px;
}

/* ---------- Project cases ---------- */
.case-list { border-top: 1px solid var(--line); }

.case { border-bottom: 1px solid var(--line); }

.case-head {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) minmax(0, 300px);
  gap: clamp(16px, 3vw, 40px);
  width: 100%;
  padding: clamp(26px, 4vh, 40px) 0;
  text-align: left;
  align-items: start;
}

.case-head:hover .case-title { color: var(--accent); }

.case-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
  padding-top: 8px;
  position: relative;
}
.case-index::after {
  content: '';
  position: absolute;
  left: 0;
  top: 30px;
  width: 26px;
  height: 1px;
  background: var(--line-strong);
}

.case-head-main { display: block; min-width: 0; }

.case-eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

.case-title {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.08;
  letter-spacing: -0.005em;
  transition: color var(--speed) ease;
}

.case-summary {
  display: block;
  margin-top: 12px;
  max-width: 62ch;
  color: var(--ink-soft);
  font-size: 14.5px;
}

.case-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 16px;
  padding-top: 6px;
}

.case-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}
.case-tags span {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  border: 1px solid var(--line);
  background: var(--bg-raised);
  padding: 3px 8px;
  border-radius: var(--radius);
}

.case-toggle {
  position: relative;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink-soft);
  flex: none;
  transition: border-color var(--speed) ease, background var(--speed) ease, transform 260ms ease;
}
.case-toggle svg { display: none; }
.case-toggle::before,
.case-toggle::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 2px;
  background: currentColor;
  transform: translate(-50%, -50%);
}
.case-toggle::after { transform: translate(-50%, -50%) rotate(90deg); }

.case-head:hover .case-toggle { border-color: var(--accent); color: var(--accent); }

.case.open .case-toggle {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.case.open .case-toggle::after { transform: translate(-50%, -50%) rotate(0deg); }
.case.open .case-index { color: var(--accent); }

/* Case body (rendered by JS) */
.case-body {
  overflow: hidden;
  transition: height 380ms cubic-bezier(0.3, 0.7, 0.2, 1);
}
.case-body[hidden] { display: none; }

.case-body-inner {
  padding: 6px 0 clamp(36px, 5vh, 56px);
  padding-left: clamp(0px, 8.5vw, 112px);
  display: grid;
  gap: clamp(28px, 4vh, 40px);
}

.case-lead {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: clamp(24px, 3vw, 48px);
  align-items: start;
}

.case-desc-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.case-desc-text { color: var(--ink-soft); font-size: 15px; }

.case-desc-meta {
  display: grid;
  gap: 8px;
  align-content: start;
}
.case-desc-meta span {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  color: var(--muted);
  border-left: 2px solid var(--line-strong);
  padding-left: 10px;
}

.case-links {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.case-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--bg-raised);
  transition: border-color var(--speed) ease, color var(--speed) ease;
}
.case-link:hover { border-color: var(--accent); color: var(--accent); }
.case-link .icon { color: var(--muted); }

.case-media {
  display: grid;
  gap: 18px;
}

.case-video { min-width: 0; }

.case-video video {
  width: 100%;
  max-height: 68vh;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #000;
}

.case-video-label,
.case-fig figcaption {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 8px;
}

.case-figs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
}

.case-fig { margin: 0; min-width: 0; }
.case-fig button {
  display: block;
  width: 100%;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-dim);
  transition: border-color var(--speed) ease;
}
.case-fig button:hover { border-color: var(--accent); }
.case-fig img { width: 100%; }

.case-splits {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(420px, 100%), 1fr));
  gap: clamp(24px, 3vw, 44px);
  border-top: 1px solid var(--line);
  padding-top: clamp(24px, 4vh, 36px);
}

.case-split { display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 12px; }

.case-split-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--accent);
  padding-top: 3px;
}

.case-split-text { min-width: 0; }

.case-split h4 {
  font-size: 15.5px;
  font-weight: 600;
  margin-bottom: 8px;
}

.case-split p {
  color: var(--ink-soft);
  font-size: 13.8px;
  line-height: 1.7;
}

.case-split .case-fig { margin-top: 12px; }
.case-split .case-fig img { border: 1px solid var(--line); border-radius: var(--radius); }

/* ---------- Archive (folded) ---------- */
.archive {
  margin-top: clamp(40px, 7vh, 64px);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  background: var(--bg-raised);
}

.archive-summary {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: clamp(18px, 3vh, 26px) clamp(18px, 3vw, 28px);
  cursor: pointer;
  list-style: none;
  transition: color var(--speed) ease;
}
.archive-summary::-webkit-details-marker { display: none; }
.archive-summary:hover .archive-title { color: var(--accent); }

.archive-summary-main {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
  margin-right: auto;
  min-width: 0;
}

.archive-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
}

.archive-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(20px, 2.4vw, 27px);
  transition: color var(--speed) ease;
}

.archive-toggle {
  position: relative;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink-soft);
  flex: none;
  transition: border-color var(--speed) ease, background var(--speed) ease, transform 260ms ease;
}
.archive-toggle::before,
.archive-toggle::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 11px;
  height: 2px;
  background: currentColor;
  transform: translate(-50%, -50%);
}
.archive-toggle::after { transform: translate(-50%, -50%) rotate(90deg); }
.archive-summary:hover .archive-toggle { border-color: var(--accent); color: var(--accent); }
.archive[open] .archive-toggle {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: rotate(180deg);
}
.archive[open] .archive-toggle::after { transform: translate(-50%, -50%) rotate(0deg); }

.archive-body {
  padding: 4px clamp(18px, 3vw, 28px) clamp(22px, 4vh, 34px);
  border-top: 1px dashed var(--line);
}

.archive-note {
  margin: 14px 0 20px;
  max-width: 68ch;
  color: var(--ink-soft);
  font-size: 14px;
}

.archive-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  align-items: center;
}

.archive-media {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-dim);
}

.archive-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}
.archive-facts span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  background: var(--bg-raised);
  padding: 4px 10px;
  border-radius: var(--radius);
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(240px, 360px) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
}

.about-portrait {
  position: relative;
  margin: 0;
}
.about-portrait img {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  filter: saturate(0.92) contrast(1.02);
}
.about-portrait::before,
.about-portrait::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 0 solid var(--accent);
  z-index: 1;
}
.about-portrait::before { top: -5px; left: -5px; border-top-width: 2px; border-left-width: 2px; }
.about-portrait::after { bottom: -5px; right: -5px; border-bottom-width: 2px; border-right-width: 2px; }

.about-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.about-lead {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.7;
  color: var(--ink);
  max-width: 62ch;
}
html[lang='zh-CN'] .about-lead { line-height: 1.95; }

.about-cards {
  margin-top: clamp(28px, 4vh, 44px);
  display: grid;
}

.about-card {
  padding: 22px 0;
  border-top: 1px solid var(--line);
}
.about-card:last-child { border-bottom: 1px solid var(--line); }

.about-card h3 {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}

.card-index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  border: 1px solid var(--accent);
  width: 22px;
  height: 22px;
  display: inline-grid;
  place-items: center;
  border-radius: var(--radius);
  transform: translateY(2px);
  flex: none;
}

.about-card p {
  color: var(--ink-soft);
  font-size: 14.5px;
  max-width: 66ch;
}

/* ---------- Timeline ---------- */
.timeline { border-top: 1px solid var(--line); }

.timeline-item {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: clamp(18px, 3vw, 44px);
  padding: clamp(26px, 4vh, 38px) 0;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.timeline-when {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding-top: 5px;
}

.timeline-node {
  position: absolute;
  left: 132px;
  top: clamp(32px, 4.6vh, 44px);
  width: 8px;
  height: 8px;
  background: var(--bg);
  border: 2px solid var(--accent);
}

.timeline-body { min-width: 0; padding-left: clamp(0px, 3vw, 26px); }

.timeline-stage {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 2px 8px;
  border-radius: var(--radius);
  margin-bottom: 12px;
}

.timeline-org {
  font-size: clamp(19px, 2.2vw, 25px);
  font-weight: 600;
  line-height: 1.25;
}

.timeline-role {
  margin-top: 5px;
  color: var(--accent-strong);
  font-size: 14px;
  font-weight: 600;
}

.timeline-summary {
  margin-top: 12px;
  color: var(--ink-soft);
  font-size: 14.5px;
  max-width: 72ch;
}

.timeline-points {
  margin-top: 14px;
  display: grid;
  gap: 8px;
}
.timeline-points li {
  position: relative;
  padding-left: 20px;
  color: var(--ink-soft);
  font-size: 13.8px;
  line-height: 1.65;
}
.timeline-points li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--line-strong);
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}
.timeline-tags span {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 3px 8px;
  border-radius: var(--radius);
}

.timeline-next {
  margin-top: clamp(28px, 4vh, 40px);
  width: 100%;
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr) auto;
  gap: clamp(18px, 3vw, 44px);
  align-items: center;
  text-align: left;
  padding: clamp(22px, 3.6vh, 32px) clamp(14px, 2vw, 22px);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  transition: border-color var(--speed) ease, background var(--speed) ease;
}
.timeline-next:hover { border-color: var(--accent); background: var(--accent-soft); }

.timeline-next-period {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--accent);
}

.timeline-next-dest {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(20px, 2.4vw, 27px);
}

.timeline-next-hint {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.timeline-next-arrow {
  font-size: 22px;
  color: var(--accent);
  transition: transform var(--speed) ease;
}
.timeline-next:hover .timeline-next-arrow { transform: translateX(6px); }

/* ---------- Contact ---------- */
.contact-list { border-top: 1px solid var(--line); }

.contact-row {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr) auto;
  gap: clamp(14px, 3vw, 40px);
  align-items: center;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.contact-label {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.contact-label .icon { color: var(--accent); }

.contact-value {
  font-size: 15.5px;
  font-weight: 600;
  overflow-wrap: anywhere;
}

a.contact-value { text-decoration: none; }
a.contact-value:hover { color: var(--accent); }

.contact-action-slot {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.contact-action {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--bg-raised);
  text-decoration: none;
  transition: border-color var(--speed) ease, color var(--speed) ease;
}
.contact-action:hover { border-color: var(--accent); color: var(--accent); }
.contact-action .icon-done { display: none; }
.contact-action.is-copied { border-color: var(--accent); color: var(--accent); }
.contact-action.is-copied .icon-copy { display: none; }
.contact-action.is-copied .icon-done { display: block; }

.contact-note {
  padding: 14px 0 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

/* ---------- Music band ---------- */
.music-band {
  background: var(--ink);
  color: var(--bg);
}

.music-band-inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: clamp(48px, 8vh, 80px) var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(24px, 4vw, 56px);
  flex-wrap: wrap;
}

.music-band-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.72;
}
.music-band-kicker .icon { color: var(--accent-strong); }

.music-band-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.02;
  margin-top: 10px;
}

.music-band-note {
  margin-top: 12px;
  max-width: 52ch;
  opacity: 0.78;
  font-size: 14.5px;
}

.music-band-cta {
  background: var(--bg);
  color: var(--ink);
  border-color: var(--bg);
}
.music-band-cta:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: #16130f;
}

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); }

.footer-inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: 26px var(--gutter) 34px;
  display: flex;
  align-items: center;
  gap: 18px 32px;
  flex-wrap: wrap;
}

.footer-rights {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.footer-line {
  color: var(--muted);
  font-size: 12.5px;
  margin-right: auto;
}

.footer-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 8px 14px;
  transition: border-color var(--speed) ease, color var(--speed) ease;
}
.footer-top:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: grid;
  place-items: center;
  padding: clamp(16px, 4vw, 48px);
}
.lightbox[hidden] { display: none; }

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(12, 13, 18, 0.88);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.lightbox-frame {
  position: relative;
  margin: 0;
  max-width: min(1080px, 94vw);
  animation: lightbox-in 200ms ease;
}
@keyframes lightbox-in {
  from { opacity: 0; transform: scale(0.985); }
  to { opacity: 1; transform: none; }
}

.lightbox-media {
  max-width: 100%;
  max-height: 78vh;
  width: auto;
  height: auto;
  margin: 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: #000;
}

.lightbox-caption {
  margin-top: 12px;
  text-align: center;
  color: rgba(255, 255, 255, 0.72);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
}

.lightbox-close {
  position: absolute;
  top: -16px;
  right: -16px;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  transition: color var(--speed) ease, border-color var(--speed) ease;
}
.lightbox-close:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- Reveal on scroll ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 560ms ease, transform 560ms cubic-bezier(0.2, 0.65, 0.25, 1);
}
.js .reveal.is-in {
  opacity: 1;
  transform: none;
}

@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;
  }
  .js .reveal { opacity: 1; transform: none; }
  .arm-stage { cursor: default; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1060px) {
  .hero-inner { grid-template-columns: 1fr; min-height: 0; }
  .arm-stage { max-width: 520px; margin: 0 auto; }
  .hero-figure { order: 2; }
  .hero-scroll { display: none; }

  .case-head { grid-template-columns: 52px minmax(0, 1fr) auto; }
  .case-side { flex-direction: row; align-items: center; }
  .case-tags { display: none; }
  .case-body-inner { padding-left: 0; }
  .case-lead { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .topnav { display: none; }
  .menu-toggle { display: grid; }
  .brand-tag { display: none; }

  .about-grid { grid-template-columns: 1fr; }
  .about-portrait { max-width: 420px; }

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

  .timeline-item { grid-template-columns: 84px minmax(0, 1fr); }
  .timeline-node { left: 100px; }
  .timeline-next { grid-template-columns: 84px minmax(0, 1fr) auto; padding-left: 14px; padding-right: 14px; }

  .contact-row { grid-template-columns: 150px minmax(0, 1fr); }
  .contact-action-slot { grid-column: 2; justify-content: flex-start; }
}

@media (max-width: 560px) {
  body { font-size: 15px; }

  .topbar-inner { gap: 14px; }
  .theme-toggle { width: 30px; height: 30px; }

  .hero-title { font-size: clamp(52px, 15.5vw, 76px); }
  .hero-status { flex-direction: column; gap: 12px; }

  .case-head { grid-template-columns: minmax(0, 1fr) auto; }
  .case-index { display: none; }
  .case-side { padding-top: 2px; }

  .section-head { flex-direction: column; gap: 10px; }
  .section-index { padding-top: 0; }

  .timeline-item { grid-template-columns: 1fr; gap: 8px; }
  .timeline-node { display: none; }
  .timeline-body { padding-left: 0; }
  .timeline-next { grid-template-columns: 1fr auto; }
  .timeline-next-period { grid-column: 1 / -1; }

  .contact-row { grid-template-columns: 1fr; gap: 8px; }
  .contact-action-slot { grid-column: 1; justify-content: flex-start; }

  .music-band-inner { flex-direction: column; align-items: flex-start; }

  .footer-inner { flex-direction: column; align-items: flex-start; gap: 10px; }
  .footer-line { margin-right: 0; }

  .lightbox-close { top: 8px; right: 8px; }
}