/* ==========================================================================
   Rongxuan Zou — personal portal
   Design system: monochrome + two accents (7ADCE4 cyan / CBC885 gold).
   Type: system stack (no remote fonts — reliable in every region, offline-safe).
   ========================================================================== */

/* ---------- tokens ---------- */
:root {
  --cyan: #7ADCE4;
  --gold: #CBC885;
  --grad: linear-gradient(100deg, var(--cyan), var(--gold));
  --grad-soft: linear-gradient(100deg, rgba(122, 220, 228, .16), rgba(203, 200, 133, .16));

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
          "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Mono", Menlo,
          Consolas, "Liberation Mono", monospace;

  --wrap: 1180px;
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --sec-y: clamp(4.5rem, 9vw, 8.5rem);

  --r-sm: 4px;
  --r-md: 10px;
  --r-lg: 18px;

  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --ease-in-out: cubic-bezier(.65, 0, .35, 1);

  --glow-cyan: rgba(122, 220, 228, .10);
  --glow-gold: rgba(203, 200, 133, .10);
}

[data-theme="dark"] {
  --bg: #08090A;
  --bg-2: #0D0F11;
  --surface: rgba(255, 255, 255, .028);
  --surface-2: rgba(255, 255, 255, .055);
  --line: rgba(255, 255, 255, .10);
  --line-2: rgba(255, 255, 255, .20);
  --ink: #F3F4F3;
  --ink-2: #A9AEAA;
  --ink-3: #7E837F;
  --accent: var(--cyan);
  --accent-2: var(--gold);
  --grid-line: rgba(255, 255, 255, .045);
  --ph-bg: rgba(255, 255, 255, .05);
  --ph-line: rgba(255, 255, 255, .14);
  --nav-bg: rgba(8, 9, 10, .62);
  --shadow: 0 24px 60px -30px rgba(0, 0, 0, .9);
  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #FAFAF8;
  --bg-2: #F0F0ED;
  --surface: rgba(0, 0, 0, .022);
  --surface-2: rgba(0, 0, 0, .045);
  --line: rgba(0, 0, 0, .11);
  --line-2: rgba(0, 0, 0, .22);
  --ink: #0B0C0C;
  --ink-2: #4A4F4C;
  --ink-3: #636863;
  --accent: #0B6B74;
  --accent-2: #6E5F12;
  --grid-line: rgba(0, 0, 0, .05);
  --ph-bg: rgba(0, 0, 0, .03);
  --ph-line: rgba(0, 0, 0, .12);
  --nav-bg: rgba(250, 250, 248, .68);
  --shadow: 0 24px 50px -34px rgba(0, 0, 0, .35);
  color-scheme: light;
}

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

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

body {
  font-family: var(--sans);
  font-size: clamp(.9375rem, .35vw + .86rem, 1.0625rem);
  line-height: 1.65;
  letter-spacing: .002em;
  background: var(--bg);
  color: var(--ink);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color .4s var(--ease-in-out), color .4s var(--ease-in-out);
}

img, svg, video { display: block; max-width: 100%; }
ul, ol { list-style: none; }

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

code {
  font-family: var(--mono);
  font-size: .88em;
  padding: .05em .35em;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--surface);
}

strong { font-weight: 650; }
em { font-style: italic; }
.dim { color: var(--ink-3); }

::selection { background: var(--cyan); color: #08090A; }

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

.mono {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}

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

/* language switching: both trees exist in the DOM, one is removed from layout */
[data-lang="en"] .zh { display: none !important; }
[data-lang="zh"] .en { display: none !important; }

.skip-link {
  position: fixed;
  top: -100px; left: 1rem;
  z-index: 200;
  padding: .65rem 1rem;
  background: var(--ink);
  color: var(--bg);
  border-radius: var(--r-sm);
  font-size: .8rem;
  transition: top .2s var(--ease-out);
}
.skip-link:focus { top: 1rem; }

/* ---------- background grid veil ---------- */
.grid-veil {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(120% 80% at 50% 0%, #000 10%, transparent 72%);
          mask-image: radial-gradient(120% 80% at 50% 0%, #000 10%, transparent 72%);
  opacity: .85;
}

/* ---------- scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 120;
  background: transparent;
  pointer-events: none;
}
.scroll-progress span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--grad);
  transform-origin: left center;
}

/* ---------- layout ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  z-index: 1;
  padding-block: var(--sec-y);
  scroll-margin-top: 5.5rem;
  border-top: 1px solid var(--line);
}
.section:first-of-type { border-top: 0; }

/* ---------- topbar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: transparent;
  transition: background-color .35s var(--ease-in-out), backdrop-filter .35s var(--ease-in-out),
              border-color .35s var(--ease-in-out);
  border-bottom: 1px solid transparent;
}
.topbar.is-scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom-color: var(--line);
}

.topbar-inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: .7rem var(--gutter);
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: .7rem;
  flex: 0 0 auto;
  min-height: 32px;
}
.brand-mark {
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .06em;
  padding: .38rem .42rem;
  border-radius: var(--r-sm);
  background: var(--grad);
  color: #08090A;
  font-weight: 700;
  line-height: 1;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: .82rem; font-weight: 620; letter-spacing: -.005em; }
.brand-sub {
  font-family: var(--mono);
  font-size: .58rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.nav { margin-inline: auto; }
.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(.9rem, 2vw, 1.9rem);
}
.nav-list a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding-inline: .45rem;
  margin-inline: -.45rem;
  font-size: .78rem;
  font-weight: 500;
  color: var(--ink-2);
  transition: color .25s var(--ease-out);
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  height: 1px;
  width: 100%;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .35s var(--ease-out);
}
.nav-list a:hover { color: var(--ink); }
.nav-list a:hover::after,
.nav-list a[aria-current="true"]::after { transform: scaleX(1); }
.nav-list a[aria-current="true"] { color: var(--ink); }

.tools {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex: 0 0 auto;
}

.seg {
  display: flex;
  padding: 2px;
  gap: 2px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
}
.seg button {
  font-family: var(--mono);
  font-size: .62rem;
  letter-spacing: .08em;
  min-height: 24px;
  padding: .3rem .6rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  transition: background-color .25s var(--ease-out), color .25s var(--ease-out);
}
.seg button:hover { color: var(--ink); }
.seg button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--bg);
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 32px; height: 32px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink-2);
  cursor: pointer;
  transition: color .25s var(--ease-out), border-color .25s var(--ease-out);
}
.icon-btn:hover { color: var(--ink); border-color: var(--line-2); }
.icon-btn:active { transform: scale(.94); }

/* mobile disclosure menu */
.menu { display: none; position: relative; }
.menu summary {
  display: grid;
  place-items: center;
  width: 34px; height: 30px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--surface);
  cursor: pointer;
  list-style: none;
}
.menu summary::-webkit-details-marker { display: none; }
.menu-icon,
.menu-icon::before,
.menu-icon::after {
  display: block;
  width: 14px; height: 1px;
  background: var(--ink);
  transition: transform .3s var(--ease-out), opacity .2s;
}
.menu-icon { position: relative; }
.menu-icon::before,
.menu-icon::after { content: ""; position: absolute; left: 0; }
.menu-icon::before { top: -4px; }
.menu-icon::after { top: 4px; }
.menu[open] .menu-icon { background: transparent; }
.menu[open] .menu-icon::before { transform: translateY(4px) rotate(45deg); }
.menu[open] .menu-icon::after { transform: translateY(-4px) rotate(-45deg); }

.menu nav {
  position: absolute;
  top: calc(100% + .6rem);
  right: 0;
  min-width: 12rem;
  padding: .4rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-2);
  box-shadow: var(--shadow);
}
.menu nav a {
  display: block;
  padding: .55rem .7rem;
  border-radius: var(--r-sm);
  font-size: .85rem;
  color: var(--ink-2);
}
.menu nav a:hover { background: var(--surface-2); color: var(--ink); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  z-index: 1;
  padding-block: clamp(3rem, 9vw, 7rem) clamp(4rem, 10vw, 8rem);
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 120%;
  background:
    radial-gradient(42% 46% at 22% 18%, var(--glow-cyan), transparent 70%),
    radial-gradient(38% 42% at 82% 26%, var(--glow-gold), transparent 72%);
  pointer-events: none;
  opacity: .9;
}
.hero-wrap { position: relative; }

.eyebrow {
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: .5rem;
}
.eyebrow .tick { color: var(--accent); }

.hero-title {
  margin-top: 1.1rem;
  font-size: clamp(2.75rem, 9.5vw, 6.5rem);
  line-height: .96;
  letter-spacing: -.035em;
  font-weight: 600;
  background: linear-gradient(100deg, var(--ink) 20%, var(--cyan) 68%, var(--gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
[data-theme="light"] .hero-title {
  background: linear-gradient(100deg, var(--ink) 25%, #0B6B74 68%, #6E5F12 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.hero-alias {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  font-family: var(--mono);
  font-size: .76rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.hero-alias .sep { color: var(--accent); }

.hero-lead {
  margin-top: 1.6rem;
  max-width: 46ch;
  font-size: clamp(1.0625rem, 1.4vw, 1.3rem);
  line-height: 1.55;
  letter-spacing: -.008em;
  color: var(--ink-2);
}

.hero-actions {
  margin-top: 2.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .72rem 1.15rem;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  font-size: .84rem;
  font-weight: 550;
  letter-spacing: -.005em;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  transition: transform .18s var(--ease-out), background-color .25s var(--ease-out),
              border-color .25s var(--ease-out), color .25s var(--ease-out);
}
.btn:hover { background: var(--surface-2); border-color: var(--ink-3); }
.btn:active { transform: scale(.975); }
.btn-arrow { transition: transform .3s var(--ease-out); }
.btn:hover .btn-arrow { transform: translate(3px, -3px); }

.btn-primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.btn-primary:hover { background: var(--ink); border-color: var(--ink); opacity: .88; }

.btn-ghost { border-style: dashed; color: var(--ink-2); }
.btn-ghost:hover { color: var(--ink); }

.readout {
  margin-top: 3.25rem;
  display: grid;
  gap: .1rem;
  max-width: 62ch;
  border-top: 1px solid var(--line);
  font-size: .68rem;
  letter-spacing: .1em;
}
.readout > div {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 1rem;
  padding: .55rem 0;
  border-bottom: 1px solid var(--line);
}
.readout dt { color: var(--ink-3); }
.readout dd { color: var(--ink-2); }
.readout a {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  text-transform: none;
  color: var(--accent);
  border-bottom: 1px solid transparent;
}
.readout a:hover { border-bottom-color: currentColor; }

.scroll-cue {
  position: absolute;
  right: var(--gutter);
  bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: .6rem;
  font-size: .58rem;
  color: var(--ink-3);
}
.scroll-cue-line {
  display: block;
  width: 42px; height: 1px;
  background: var(--grad);
  transform-origin: left center;
  animation: cue 2.6s var(--ease-in-out) infinite;
}
@keyframes cue {
  0%, 100% { transform: scaleX(.3); opacity: .4; }
  50% { transform: scaleX(1); opacity: 1; }
}

/* ---------- section headers ---------- */
.sec-head { margin-bottom: clamp(2rem, 4vw, 3.25rem); }
.sec-idx {
  color: var(--accent);
  margin-bottom: .9rem;
}
.sec-head h2 {
  font-size: clamp(1.9rem, 4.4vw, 3.1rem);
  line-height: 1.04;
  letter-spacing: -.028em;
  font-weight: 600;
}
.sec-zh {
  margin-top: .45rem;
  font-size: clamp(.95rem, 1.2vw, 1.1rem);
  letter-spacing: .06em;
  color: var(--ink-3);
}
.sec-lead {
  margin-top: 1.25rem;
  max-width: 60ch;
  color: var(--ink-2);
}
.sec-lead a { color: var(--accent); border-bottom: 1px solid currentColor; }

.sub-head {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink);
  margin-bottom: .85rem;
}
.sub-note { color: var(--ink-3); font-weight: 400; }

/* ---------- about ---------- */
.about-grid {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: start;
}
.about-copy p + p { margin-top: 1.15rem; }
.about-copy .lead {
  font-size: clamp(1.0625rem, 1.25vw, 1.2rem);
  line-height: 1.6;
  letter-spacing: -.008em;
}
.about-copy strong { color: var(--accent); font-weight: 600; }

.facts { border-top: 1px solid var(--line); }
.fact {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1rem;
  padding: .8rem 0;
  border-bottom: 1px solid var(--line);
}
.fact dt { font-size: .78rem; color: var(--ink-3); }
.fact dd { font-size: .88rem; color: var(--ink); text-wrap: pretty; }
.fact .aliases { letter-spacing: .05em; }
.fact a {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  border-bottom: 1px solid var(--line-2);
}
.fact a:hover { color: var(--accent); border-bottom-color: currentColor; }
.fact em { color: var(--ink-2); }

/* ---------- studio ---------- */
.studio-hero {
  display: grid;
  gap: 1.25rem;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}
.slogan {
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  line-height: 1;
  letter-spacing: -.035em;
  font-weight: 600;
  font-style: italic;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
[data-theme="light"] .slogan {
  background: linear-gradient(100deg, #0B6B74, #6E5F12);
  -webkit-background-clip: text;
  background-clip: text;
}
.studio-lead { max-width: 62ch; color: var(--ink-2); }

/* Tile grids: internal 1px rules drawn by the cells themselves, so an unfilled
   grid track stays invisible instead of showing the container colour as a hole. */
.creed,
.div-grid,
.ai-legend {
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}
.creed > li,
.div-grid > li,
.ai-legend > li {
  background: var(--bg);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.creed {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: clamp(2.5rem, 5vw, 3.5rem);
}
.creed li {
  display: flex;
  flex-direction: column;
  gap: .55rem;
  padding: clamp(1.1rem, 2.4vw, 1.75rem);
}
.creed-word {
  color: var(--accent);
}
.creed-line { margin-top: auto; font-size: .9rem; color: var(--ink-2); }

.div-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 13rem), 1fr));
}
.div-item {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  padding: .95rem 1.1rem;
  background: var(--bg);
  transition: background-color .3s var(--ease-out);
}
.div-item:hover { background: var(--surface-2); }
.div-code {
  font-size: .6rem;
  color: var(--accent);
  padding: .15rem .3rem;
  border: 1px solid var(--line-2);
  border-radius: 3px;
}
.div-name { font-size: .9rem; }

.studio-foot {
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
}

/* ---------- work ---------- */
.work-list { display: grid; gap: clamp(2rem, 4vw, 3rem); }

.work {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(1.25rem, 3vw, 2.5rem);
  align-items: stretch;
  padding: clamp(1.1rem, 2vw, 1.5rem);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  transition: border-color .35s var(--ease-out), background-color .35s var(--ease-out),
              transform .35s var(--ease-out);
  scroll-margin-top: 5.5rem;
}
.work:hover { border-color: var(--line-2); transform: translateY(-2px); }

.work-media { position: relative; display: flex; flex-direction: column; }
.work-media .ph { flex: 1 1 auto; min-height: 11rem; }

/* pointer-follow light, painted behind the card content */
.work,
.vol { position: relative; }
.work::after,
.vol::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: inherit;
  background: radial-gradient(220px circle at var(--mx, 50%) var(--my, 50%),
              var(--glow-cyan), transparent 68%);
  opacity: 0;
  pointer-events: none;
  transition: opacity .4s var(--ease-out);
}
.work:hover::after,
.vol:hover::after { opacity: 1; }
.work > *,
.vol > * { position: relative; z-index: 1; }

.work-body { padding-block: .25rem; }

.work-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: .85rem;
}
.work-idx {
  font-size: .72rem;
  color: var(--ink-3);
}
.work-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
}

.chip {
  font-size: .58rem;
  letter-spacing: .08em;
  padding: .2rem .45rem;
  border: 1px solid var(--line-2);
  border-radius: 3px;
  color: var(--ink-2);
  background: transparent;
}

.work-title {
  font-size: clamp(1.3rem, 2.2vw, 1.75rem);
  line-height: 1.15;
  letter-spacing: -.022em;
  font-weight: 600;
}
.work-sub {
  margin-top: .4rem;
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
}
.work-desc {
  margin-top: 1rem;
  color: var(--ink-2);
  font-size: .95rem;
}

.stats {
  margin-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: .66rem;
  letter-spacing: .06em;
}
.stats > div {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1rem;
  padding: .5rem 0;
  border-bottom: 1px solid var(--line);
}
.stats dt { color: var(--accent-2); }
.stats dd { color: var(--ink-3); text-transform: none; letter-spacing: .02em; }

.links {
  margin-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}
.link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .45rem .75rem;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  font-size: .78rem;
  color: var(--ink);
  transition: background-color .25s var(--ease-out), border-color .25s var(--ease-out);
}
.link:hover { background: var(--surface-2); border-color: var(--ink-3); }
.link-arrow { color: var(--accent); transition: transform .3s var(--ease-out); }
.link:hover .link-arrow { transform: translate(2px, -2px); }

/* ---------- AI tags ---------- */
.ai {
  display: inline-flex;
  align-items: center;
  gap: .38rem;
  padding: .22rem .5rem .22rem .42rem;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: .58rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--ink-2);
}
.ai .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  flex: 0 0 auto;
  border: 1px solid currentColor;
}
.ai-none .dot { background: transparent; }
.ai-idea {
  border-color: var(--gold);
  color: var(--ink);
}
.ai-idea .dot { background: var(--gold); border-color: var(--gold); }
.ai-tech {
  border-color: transparent;
  color: #08090A;
  background: var(--grad);
}
.ai-tech .dot { background: #08090A; border-color: #08090A; }
[data-theme="light"] .ai-idea { border-color: #6E5F12; }
[data-theme="light"] .ai-idea .dot { background: #6E5F12; border-color: #6E5F12; }
[data-theme="light"] .ai-tech { background: linear-gradient(100deg, #A9E6EC, #E0DC9F); }

/* ---------- placeholder media ---------- */
.ph {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  border: 1px dashed var(--ph-line);
  border-radius: var(--r-md);
  background-color: var(--ph-bg);
  background-image: repeating-linear-gradient(
    -45deg,
    transparent 0 7px,
    var(--ph-line) 7px 8px
  );
  overflow: hidden;
}
.ph-label {
  font-size: .58rem;
  color: var(--ink-3);
  padding: .3rem .55rem;
  border: 1px solid var(--ph-line);
  border-radius: 3px;
  background: var(--bg);
}
.ph-sm { aspect-ratio: 4 / 3; }

/* ---------- series ---------- */
.series-list { display: grid; gap: clamp(2.25rem, 4.5vw, 3.25rem); }
.series {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  align-items: start;
  padding-top: clamp(1.5rem, 3vw, 2rem);
  border-top: 1px solid var(--line);
}
.series-head h3 {
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  letter-spacing: -.02em;
  font-weight: 600;
}
.series-meta {
  margin-top: .5rem;
  font-size: .6rem;
  color: var(--accent);
}
.series-desc {
  margin-top: .7rem;
  font-size: .92rem;
  color: var(--ink-2);
  max-width: 34ch;
}
.series-head .ai { margin-top: 1rem; }

.vol-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 9.5rem), 1fr));
  gap: .75rem;
}
.vol {
  display: grid;
  gap: .55rem;
  padding: .6rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface);
  transition: border-color .3s var(--ease-out), transform .3s var(--ease-out);
}
.vol:hover { border-color: var(--line-2); transform: translateY(-2px); }
.vol-title { font-size: .85rem; font-weight: 550; }
.vol-meta { font-size: .56rem; color: var(--ink-3); }
.vol-wide { grid-column: span 2; }

/* ---------- AI legend ---------- */
.ai-legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  margin-bottom: clamp(2rem, 4vw, 3rem);
}
.ai-legend li {
  padding: clamp(1.1rem, 2.4vw, 1.6rem);
}
.ai-legend p {
  margin-top: .9rem;
  font-size: .88rem;
  color: var(--ink-2);
}

.models { border-top: 1px solid var(--line); padding-top: clamp(1.5rem, 3vw, 2rem); }
.model-list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}
.model-list li {
  font-size: .64rem;
  padding: .35rem .6rem;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  color: var(--ink-2);
  background: var(--surface);
  transition: border-color .25s var(--ease-out), color .25s var(--ease-out);
}
.model-list li:hover { border-color: var(--line-2); color: var(--ink); }
.models-note { margin-top: 1rem; font-size: .82rem; color: var(--ink-3); }

/* ---------- contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
.contact-kicker { color: var(--ink-3); }
.contact-email {
  margin-top: .5rem;
  font-size: clamp(1.15rem, 2.4vw, 1.85rem);
  line-height: 1.2;
  letter-spacing: -.025em;
  font-weight: 550;
  word-break: break-word;
}
.contact-email a {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
[data-theme="light"] .contact-email a {
  background: linear-gradient(100deg, #0B6B74, #6E5F12);
  -webkit-background-clip: text;
  background-clip: text;
}
.contact-note { margin-top: 1rem; max-width: 34ch; color: var(--ink-2); font-size: .92rem; }

.contact-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.social-list { border-top: 1px solid var(--line); }
.social-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .6rem 0;
  border-bottom: 1px solid var(--line);
  font-size: .88rem;
  min-height: 2.5rem;
}
.soc-key { color: var(--ink-3); font-size: .6rem; }
.social-list a {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  border-bottom: 1px solid transparent;
}
.social-list a:hover { color: var(--accent); border-bottom-color: currentColor; }

.soc-val { display: inline-flex; align-items: center; gap: .5rem; }
.copy-btn {
  font-size: .55rem;
  letter-spacing: .1em;
  min-height: 24px;
  padding: .18rem .45rem;
  border: 1px solid var(--line-2);
  border-radius: 3px;
  background: transparent;
  color: var(--ink-3);
  cursor: pointer;
  transition: color .25s var(--ease-out), border-color .25s var(--ease-out);
}
.copy-btn:hover { color: var(--ink); border-color: var(--ink-3); }
.copy-btn.is-done { color: var(--accent); border-color: var(--accent); }

/* ---------- footer ---------- */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  padding-block: clamp(2.5rem, 5vw, 3.5rem);
  background: var(--bg-2);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}
.footer-name { font-size: .95rem; font-weight: 550; }
.footer-slogan { margin-top: .35rem; color: var(--accent); }
.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  font-size: .6rem;
  color: var(--ink-3);
}
.footer-top {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  font-size: .6rem;
  color: var(--ink-2);
}
.footer-top:hover { color: var(--accent); }

/* ---------- toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  transform: translate(-50%, 1.5rem);
  z-index: 150;
  padding: .6rem .9rem;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--bg-2);
  color: var(--ink);
  font-size: .62rem;
  letter-spacing: .1em;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s var(--ease-out), transform .35s var(--ease-out);
}
.toast.is-open { opacity: 1; transform: translate(-50%, 0); }

/* ---------- reveal (only armed when JS is present, so no-JS still reads) ---------- */
.js .reveal { opacity: 0; transform: translateY(16px); }
.reveal.is-in {
  opacity: 1;
  transform: none;
  transition:
    opacity .7s var(--ease-out) var(--d, 0ms),
    transform .8s var(--ease-out) var(--d, 0ms);
}

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .about-grid,
  .work,
  .series,
  .contact-grid { grid-template-columns: minmax(0, 1fr); }
  .creed { grid-template-columns: minmax(0, 1fr); }
  .series-desc { max-width: 60ch; }
  .work-media .ph { flex: 0 0 auto; aspect-ratio: 16 / 9; min-height: 0; }
  .scroll-cue { display: none; }
}

@media (max-width: 760px) {
  .nav { display: none; }
  .menu { display: block; }
  .topbar-inner { gap: .75rem; }
  .brand-sub { display: none; }
  .readout > div { grid-template-columns: 1fr; gap: .2rem; }
  .readout dt { font-size: .58rem; }
  .fact { grid-template-columns: 1fr; gap: .2rem; }
  .vol-wide { grid-column: span 1; }
  .studio-foot { flex-direction: column; align-items: stretch; }
  .studio-cta { justify-content: center; }
}

@media (max-width: 420px) {
  .brand-text { display: none; }
  .hero-actions .btn { flex: 1 1 100%; justify-content: center; }
}

/* ---------- preference: reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .reveal.is-in { transition: none !important; }
  .scroll-cue-line { animation: none; transform: scaleX(1); }
  .work:hover,
  .vol:hover,
  .btn:active,
  .icon-btn:active { transform: none; }
  .link:hover .link-arrow,
  .btn:hover .btn-arrow { transform: none; }
  * { transition-duration: .01ms !important; }
}

/* ---------- preference: reduced transparency ---------- */
@media (prefers-reduced-transparency: reduce) {
  .topbar.is-scrolled {
    background: var(--bg);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  .grid-veil { opacity: .5; }
}

/* ---------- preference: more contrast ---------- */
@media (prefers-contrast: more) {
  :root { --line: currentColor; --line-2: currentColor; }
  .topbar.is-scrolled { background: var(--bg); backdrop-filter: none; }
  .work, .vol, .ai, .chip, .link, .model-list li { border-color: var(--ink); }
  .grid-veil { display: none; }
}

/* ---------- defensive: gradient-clipped text must never vanish ---------- */
@supports not ((background-clip: text) or (-webkit-background-clip: text)) {
  .hero-title,
  .slogan,
  .contact-email a {
    background: none;
    color: var(--ink);
    -webkit-text-fill-color: currentColor;
  }
}
@media (forced-colors: active) {
  .hero-title,
  .slogan,
  .contact-email a {
    background: none;
    color: CanvasText;
    -webkit-text-fill-color: CanvasText;
  }
  .ai-tech { background: ButtonFace; color: ButtonText; border-color: ButtonText; }
  .grid-veil { display: none; }
}