/* ============ Design Tokens ============ */
:root {
  /* paper light theme */
  --bg: #f6f3ec;
  --bg-elev: #fbf9f4;
  --ink: #1a1814;
  --ink-soft: #4a463e;
  --ink-mute: #8a8378;
  --rule: #d9d3c5;
  --rule-soft: #e8e2d3;
  --accent: #a85a2a;       /* default ochre */
  --accent-ink: #ffffff;
  --selection: #a85a2a33;

  /* type families (toggled by tweak) */
  --f-display: "Fraunces", "Times New Roman", serif;
  --f-body: "Inter", -apple-system, "Helvetica Neue", Arial, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --f-cjk: "Noto Serif SC", "Songti SC", "STSong", serif;
  --f-cjk-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  /* density (toggled) */
  --gutter: 28px;
  --section-gap: 96px;
  --line: 1.6;
  --hero-pad-y: 14vh;
}

[data-theme="dark"] {
  --bg: #14130f;
  --bg-elev: #1c1a16;
  --ink: #f0ebde;
  --ink-soft: #c4bdab;
  --ink-mute: #807a6c;
  --rule: #2c2a24;
  --rule-soft: #232119;
  --accent-ink: #14130f;
  --selection: #ffffff22;
}

[data-density="compact"] {
  --gutter: 20px;
  --section-gap: 64px;
  --line: 1.55;
  --hero-pad-y: 9vh;
}
[data-density="airy"] {
  --gutter: 36px;
  --section-gap: 128px;
  --line: 1.75;
  --hero-pad-y: 18vh;
}

[data-typeset="sans"] {
  --f-display: "Inter", -apple-system, sans-serif;
  --f-body: "Inter", -apple-system, sans-serif;
  --f-cjk: "Noto Sans SC", "PingFang SC", sans-serif;
}
[data-typeset="mono"] {
  --f-display: "JetBrains Mono", ui-monospace, monospace;
  --f-body: "JetBrains Mono", ui-monospace, monospace;
  --f-cjk: "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: var(--line);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  transition: background 240ms ease, color 240ms ease;
}
body {
  min-height: 100vh;
  overflow-x: hidden;
  cursor: none;
}
@media (max-width: 720px) {
  body { cursor: auto; }
}

::selection { background: var(--selection); color: inherit; }

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; padding: 0; }

/* ============ Layout ============ */
.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: var(--section-gap) 0;
  border-top: 1px solid var(--rule);
  position: relative;
}
.section:first-of-type { border-top: none; }

.section-head {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  align-items: baseline;
  margin-bottom: 56px;
}
@media (max-width: 820px) {
  .section-head { grid-template-columns: 1fr; gap: 16px; margin-bottom: 32px; }
}

.section-num {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-mute);
  text-transform: uppercase;
}

.section-title {
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 0;
}
.section-title .cn {
  font-family: var(--f-cjk);
  display: block;
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: 0.62em;
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* ============ Header / Nav ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: color-mix(in oklab, var(--bg) 78%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms ease, background 200ms ease;
}
.nav.scrolled { border-bottom-color: var(--rule); }
.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  font-family: var(--f-display);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.005em;
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand-mark {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  flex-shrink: 0;
  box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--ink) 12%, transparent);
}
.brand-cn { font-family: var(--f-cjk); color: var(--ink-soft); font-size: 14px; margin-left: 2px; }
.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.nav-links a { position: relative; padding: 6px 0; transition: color 160ms ease; }
.nav-links a:hover { color: var(--ink); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  height: 1px; width: 0;
  background: var(--accent);
  transition: width 200ms ease;
}
.nav-links a:hover::after { width: 100%; }

@media (max-width: 720px) {
  .nav-links { display: none; }
}

/* ============ Hero ============ */
.hero {
  padding: calc(var(--hero-pad-y) + 56px) 0 var(--hero-pad-y);
  border-top: none !important;
  position: relative;
}
.hero-meta {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
  text-transform: uppercase;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.hero-meta .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: #4caf50;
  box-shadow: 0 0 0 4px color-mix(in oklab, #4caf50 22%, transparent);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

.hero h1 {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: clamp(44px, 8.4vw, 124px);
  line-height: 0.96;
  letter-spacing: -0.025em;
  margin: 0 0 8px;
  text-wrap: balance;
}
.hero h1 .accent {
  color: var(--accent);
  font-style: italic;
  font-weight: 400;
}
.hero h1 .cn {
  display: block;
  font-family: var(--f-cjk);
  font-size: 0.34em;
  font-weight: 400;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  margin-top: 18px;
  line-height: 1.2;
}

.hero-sub {
  font-family: var(--f-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  margin-top: 36px;
  max-width: 560px;
  min-height: 3em;
}
.hero-sub .caret {
  display: inline-block;
  width: 8px;
  height: 1em;
  background: var(--accent);
  margin-left: 2px;
  vertical-align: -2px;
  animation: blink 1.05s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 48px;
  align-items: end;
}
@media (max-width: 820px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
}

.hero-card {
  border: 1px solid var(--rule);
  background: var(--bg-elev);
  padding: 18px;
  border-radius: 2px;
}
.hero-card .label {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.hero-card .value {
  font-family: var(--f-display);
  font-size: 20px;
  line-height: 1.2;
}
.hero-card .value .cn {
  font-family: var(--f-cjk);
  font-size: 14px;
  color: var(--ink-soft);
  display: block;
  margin-top: 4px;
}

/* placeholder portrait */
.portrait {
  aspect-ratio: 3 / 4;
  background:
    repeating-linear-gradient(
      45deg,
      var(--rule-soft) 0 8px,
      transparent 8px 16px
    ),
    var(--bg-elev);
  border: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
}
.portrait::after {
  content: "";
}

/* ============ About ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}
@media (max-width: 820px) {
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
}
.about p {
  font-size: 17px;
  line-height: 1.7;
  margin: 0 0 18px;
  color: var(--ink-soft);
  text-wrap: pretty;
}
.about p strong { color: var(--ink); font-weight: 500; }
.about .cn-block { font-family: var(--f-cjk); }
.about .en-block { font-family: var(--f-body); }

/* facts */
.facts {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.facts .fact {
  background: var(--bg);
  padding: 16px 18px;
}
.facts .fact .k {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--ink-mute);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.facts .fact .v { font-family: var(--f-display); font-size: 17px; }
.facts .fact .v .cn { font-family: var(--f-cjk); font-size: 13px; color: var(--ink-soft); display: block; }

/* ============ Skills ============ */
.skills {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
@media (max-width: 820px) { .skills { grid-template-columns: 1fr; } }
.skill-group h4 {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}
.skill-group ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.skill-group li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 14.5px;
  gap: 12px;
}
.skill-group li .lbl { color: var(--ink); }
.skill-group li .lbl .cn { font-family: var(--f-cjk); color: var(--ink-mute); font-size: 12px; margin-left: 6px; }
.skill-group li .lvl {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.skill-bar {
  flex: 1;
  height: 1px;
  background: var(--rule);
  position: relative;
  margin: 0 4px 4px;
  align-self: end;
}
.skill-bar::after {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0;
  background: var(--accent);
  width: var(--p, 0%);
  transition: width 600ms cubic-bezier(.2,.7,.2,1);
}

/* ============ Projects ============ */
.projects { display: flex; flex-direction: column; }
.project {
  border-top: 1px solid var(--rule);
  padding: 28px 0;
  display: grid;
  grid-template-columns: 80px 1fr 220px 24px;
  gap: 32px;
  align-items: baseline;
  cursor: pointer;
  transition: background 200ms ease, padding 240ms ease;
  position: relative;
}
.project:last-child { border-bottom: 1px solid var(--rule); }
.project:hover { background: var(--bg-elev); padding-left: 12px; padding-right: 12px; }
.project .p-num {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ink-mute);
}
.project .p-title {
  font-family: var(--f-display);
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.15;
  font-weight: 400;
  letter-spacing: -0.01em;
}
.project .p-title .cn {
  font-family: var(--f-cjk);
  display: block;
  font-size: 0.55em;
  color: var(--ink-soft);
  margin-top: 4px;
}
.project .p-meta {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: right;
}
.project .p-toggle {
  font-family: var(--f-mono);
  font-size: 18px;
  color: var(--ink-mute);
  transition: transform 240ms ease, color 200ms ease;
  text-align: right;
}
.project[data-open="true"] .p-toggle { transform: rotate(45deg); color: var(--accent); }

.project-detail {
  grid-column: 2 / 4;
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 320ms cubic-bezier(.2,.7,.2,1);
}
.project[data-open="true"] .project-detail { grid-template-rows: 1fr; }
.project-detail > div {
  overflow: hidden;
  min-height: 0;
}
.project-detail-inner {
  padding: 18px 0 8px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.7;
}
.project-detail-inner .preview {
  aspect-ratio: 4 / 3;
  background:
    repeating-linear-gradient(135deg, var(--rule-soft) 0 6px, transparent 6px 12px),
    var(--bg-elev);
  border: 1px solid var(--rule);
  position: relative;
}
.project-detail-inner .preview::after {
  content: attr(data-label);
  position: absolute;
  inset: 0;
  display: grid; place-items: center;
  font-family: var(--f-mono); font-size: 11px;
  color: var(--ink-mute); letter-spacing: 0.12em;
}
.tag-row {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-top: 12px;
}
.tag {
  font-family: var(--f-mono);
  font-size: 10.5px;
  padding: 3px 8px;
  border: 1px solid var(--rule);
  color: var(--ink-soft);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

@media (max-width: 820px) {
  .project { grid-template-columns: 40px 1fr 24px; gap: 14px; }
  .project .p-meta { display: none; }
  .project-detail { grid-column: 2 / 4; }
  .project-detail-inner { grid-template-columns: 1fr; }
}

/* ============ Experience ============ */
.exp { display: flex; flex-direction: column; }
.exp-row {
  display: grid;
  grid-template-columns: 200px 1fr 1fr;
  gap: 32px;
  padding: 22px 0;
  border-top: 1px solid var(--rule);
  align-items: baseline;
}
.exp-row:last-child { border-bottom: 1px solid var(--rule); }
.exp-row .when {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--ink-mute);
  letter-spacing: 0.08em;
}
.exp-row .role {
  font-family: var(--f-display);
  font-size: 19px;
  line-height: 1.3;
}
.exp-row .role .cn { font-family: var(--f-cjk); display: block; color: var(--ink-soft); font-size: 14px; margin-top: 2px; }
.exp-row .where {
  font-size: 14px;
  color: var(--ink-soft);
}
.exp-row .where .cn { font-family: var(--f-cjk); display: block; color: var(--ink-mute); font-size: 12.5px; margin-top: 2px; }

@media (max-width: 820px) {
  .exp-row { grid-template-columns: 1fr; gap: 4px; padding: 16px 0; }
}

/* ============ Writing ============ */
.writing { display: flex; flex-direction: column; }
.write-row {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  gap: 24px;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
  align-items: baseline;
  cursor: pointer;
  transition: padding 240ms ease, background 200ms ease;
}
.write-row:last-child { border-bottom: 1px solid var(--rule); }
.write-row:hover { padding-left: 10px; background: var(--bg-elev); }
.write-row:hover .arrow { transform: translateX(4px); color: var(--accent); }
.write-row .date { font-family: var(--f-mono); font-size: 12px; color: var(--ink-mute); }
.write-row .title { font-family: var(--f-display); font-size: 19px; }
.write-row .title .cn { font-family: var(--f-cjk); display: block; font-size: 13.5px; color: var(--ink-soft); margin-top: 2px; }
.write-row .arrow { font-family: var(--f-mono); color: var(--ink-mute); transition: transform 200ms ease, color 200ms ease; }

/* ============ Contact ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 820px) { .contact-grid { grid-template-columns: 1fr; gap: 32px; } }

.contact-lead {
  font-family: var(--f-display);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.1;
  font-weight: 300;
  letter-spacing: -0.015em;
  margin: 0 0 24px;
  text-wrap: balance;
}
.contact-lead .cn { font-family: var(--f-cjk); display: block; color: var(--ink-soft); font-size: 0.55em; margin-top: 12px; }
.contact-lead a {
  color: var(--accent);
  border-bottom: 1px solid color-mix(in oklab, var(--accent) 50%, transparent);
  transition: border-color 200ms ease;
}
.contact-lead a:hover { border-bottom-color: var(--accent); }

.links-list { list-style: none; padding: 0; margin: 0; }
.links-list li {
  border-top: 1px solid var(--rule);
  padding: 14px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: padding 200ms ease, background 200ms ease;
}
.links-list li:last-child { border-bottom: 1px solid var(--rule); }
.links-list li:hover { padding-left: 8px; background: var(--bg-elev); }
.links-list li:hover .lk-arrow { color: var(--accent); transform: translate(2px, -2px); }
.links-list .lk-name {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.links-list .lk-handle { font-family: var(--f-display); font-size: 17px; }
.links-list .lk-arrow { font-family: var(--f-mono); color: var(--ink-mute); transition: color 200ms ease, transform 200ms ease; }

/* ============ Footer ============ */
footer {
  border-top: 1px solid var(--rule);
  padding: 32px 0;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
footer .colophon { max-width: 480px; line-height: 1.6; }

/* ============ Cursor ============ */
.cursor-dot, .cursor-ring {
  position: fixed;
  top: 0; left: 0;
  pointer-events: none;
  z-index: 100;
  mix-blend-mode: difference;
  will-change: transform;
}
.cursor-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #f0ebde;
  transform: translate(-50%, -50%);
}
.cursor-ring {
  width: 32px; height: 32px;
  border: 1px solid #f0ebde;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 200ms ease, height 200ms ease, border-color 200ms ease;
}
.cursor-ring.active {
  width: 56px; height: 56px;
  border-color: var(--accent);
}
@media (max-width: 720px) {
  .cursor-dot, .cursor-ring { display: none; }
}

/* ============ Reveal animation ============ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 700ms ease, transform 700ms cubic-bezier(.2,.7,.2,1);
}
.reveal.in { opacity: 1; transform: none; }

/* hidden via tweak */
[data-hide-skills="true"] #skills,
[data-hide-writing="true"] #writing,
[data-hide-experience="true"] #experience { display: none; }

/* theme toggle / quick controls (top-right small) */
.mode-btn {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 6px 10px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  transition: border-color 200ms ease, color 200ms ease;
}
.mode-btn:hover { border-color: var(--accent); color: var(--ink); }