/* ==========================================================================
   zhangdaming.com — Design system: Editorial folio
   Warm paper · ink type · italic serif display · mono labels · coral signal
   ========================================================================== */

/* ---------- 1. Design tokens ---------- */
:root {
  /* Paper & ink */
  --paper:     #f4efe5;
  --paper-2:   #fbf7ee;
  --ink:       #181511;
  --ink-soft:  #4e473f;
  --muted:     #81786e;
  --rule:        rgba(24, 21, 17, 0.18);
  --rule-strong: rgba(24, 21, 17, 0.34);

  /* Signal */
  --coral: #d96b5f;
  --gilt:  #b79b5b;
  --blue:  #334c63;

  /* Slab */
  --slab:   #171511;
  --slab-2: #211f1b;

  /* Type */
  --display: "Playfair Display", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --body:    "Inter Tight", "Avenir Next", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono:    "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Layout */
  --page:   min(1440px, calc(100vw - 40px));
  --gutter: clamp(20px, 4vw, 72px);

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-card: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- 2. Reset & paper ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background: var(--paper);
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.5;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 18% 12%, rgba(216, 170, 160, 0.24), transparent 28vw),
    radial-gradient(circle at 88% 30%, rgba(183, 155, 91, 0.16), transparent 30vw),
    linear-gradient(90deg, rgba(24, 21, 17, 0.032) 1px, transparent 1px),
    linear-gradient(0deg, rgba(24, 21, 17, 0.024) 1px, transparent 1px),
    var(--paper);
  background-size: auto, auto, 24px 24px, 24px 24px, auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
}

/* Halftone grain */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.42;
  background-image: radial-gradient(rgba(24, 21, 17, 0.12) 0.7px, transparent 0.7px);
  background-size: 5px 5px;
  mix-blend-mode: multiply;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
em { font-family: var(--display); font-style: italic; font-weight: 500; }

::selection { background: var(--coral); color: var(--paper-2); }

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

.shell {
  position: relative;
  z-index: 2;
  width: var(--page);
  margin: 0 auto;
  padding: 18px 0 42px;
}

.coral { color: var(--coral); }

/* ---------- 3. Issue strip & nav ---------- */
.issue-strip {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 18px;
  align-items: center;
  min-height: 38px;
  border-top: 1px dotted var(--rule-strong);
  border-bottom: 1px dotted var(--rule-strong);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.issue-strip span:nth-child(2) { color: var(--ink); }
.issue-strip span:last-child { text-align: right; }

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
  min-height: 76px;
  margin: 18px 0 0;
  padding: 0 18px;
  border: 1px solid var(--rule);
  background: rgba(251, 247, 238, 0.86);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  transition: min-height 180ms ease, box-shadow 180ms ease;
}
.nav.is-stuck {
  min-height: 60px;
  box-shadow: 0 10px 30px rgba(36, 28, 18, 0.08);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  background: var(--paper-2);
  font-family: var(--display);
  font-size: 24px;
  font-style: italic;
  line-height: 1;
  transition: background 200ms ease, color 200ms ease;
}
.brand-mark:hover { background: var(--ink); color: var(--paper-2); }

.nav-links {
  display: flex;
  justify-content: center;
  gap: clamp(18px, 3vw, 42px);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.nav-links a { position: relative; padding: 6px 0; }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--coral);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 300ms var(--ease-out);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { transform: scaleX(1); }

.nav-cta,
.pill {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 16px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background 200ms ease, color 200ms ease, transform 200ms var(--ease-out);
}
.pill { background: var(--paper-2); }
.nav-cta,
.pill--ink { background: var(--ink); color: var(--paper-2); }
.nav-cta:hover,
.pill:hover { transform: translateY(-2px); }
.pill:hover { background: var(--coral); border-color: var(--coral); color: var(--paper-2); }

/* ---------- 4. Shared type ---------- */
.kicker {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.display {
  margin: 0;
  font-family: var(--body);
  font-size: clamp(38px, 5.8vw, 92px);
  font-weight: 700;
  line-height: 0.94;
  letter-spacing: -0.04em;
  text-wrap: balance;
}
.dot::after {
  content: ".";
  color: var(--coral);
  font-family: var(--display);
  font-style: italic;
}

.pull {
  margin: 0;
  max-width: 1100px;
  font-family: var(--display);
  font-size: clamp(32px, 4.6vw, 76px);
  font-style: italic;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.body-copy {
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(15px, 1.05vw, 18px);
  line-height: 1.62;
  text-wrap: pretty;
}

.section { padding: clamp(64px, 9vw, 140px) 0 0; }

.section-label {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: center;
  margin-bottom: clamp(26px, 4vw, 54px);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.section-label::after {
  content: "";
  height: 1px;
  background: var(--rule);
}

/* ---------- 5. Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(28px, 4vw, 64px);
  align-items: end;
  padding-top: clamp(40px, 6vw, 96px);
}

.hero__copy { display: grid; gap: 28px; }

.hero__title {
  margin: 0;
  font-size: clamp(54px, 8.6vw, 148px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.055em;
}
.hero__title em {
  display: block;
  margin-top: 0.12em;
  font-size: 0.52em;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink-soft);
}

.hero__sub { max-width: 34em; }

.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; }

.plate {
  position: relative;
  margin: 0;
  padding: 14px;
  border: 1px solid var(--ink);
  background: var(--paper-2);
  box-shadow: 0 26px 70px rgba(36, 28, 18, 0.14);
}
.hero__plate { --rotate: 1.4deg; }

.plate__art {
  width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  background: var(--paper);
}
.plate__art .layer { transition: transform 600ms var(--ease-out); }

.plate__cap {
  display: flex;
  justify-content: space-between;
  padding-top: 12px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.spin {
  transform-box: fill-box;
  transform-origin: center;
  animation: spin 40s linear infinite;
}
.spin--rev  { animation-duration: 26s; animation-direction: reverse; }
.spin--fast { animation-duration: 14s; }
@keyframes spin { to { transform: rotate(360deg); } }

.route { animation: march 1.6s linear infinite; }
@keyframes march { to { stroke-dashoffset: -16; } }

.poster-footer {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.poster-footer a:hover { color: var(--coral); }

/* ---------- 6. About ---------- */
.text-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(20px, 4vw, 64px);
  max-width: 1000px;
  margin: clamp(32px, 4vw, 56px) 0 0 auto;
}

.ledger {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: clamp(48px, 6vw, 88px) 0 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.ledger__item {
  display: flex;
  flex-direction: column-reverse;
  gap: 10px;
  padding: 26px 20px 22px;
  border-left: 1px dotted var(--rule-strong);
}
.ledger__item:first-child { border-left: 0; padding-left: 0; }
.ledger dt {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.ledger dd {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(44px, 5vw, 80px);
  font-style: italic;
  font-weight: 500;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

/* ---------- 7. Work (dark slab) ---------- */
.dark-slab {
  margin-top: clamp(64px, 9vw, 140px);
  margin-inline: calc((100vw - var(--page)) / -2);
  padding: clamp(58px, 7vw, 112px) max(var(--gutter), calc((100vw - var(--page)) / 2));
  background:
    linear-gradient(90deg, rgba(244, 239, 229, 0.06) 1px, transparent 1px),
    linear-gradient(0deg, rgba(244, 239, 229, 0.04) 1px, transparent 1px),
    var(--slab);
  background-size: 28px 28px;
  color: var(--paper-2);
}
.dark-slab .section-label,
.dark-slab .body-copy { color: rgba(251, 247, 238, 0.68); }
.dark-slab .section-label::after { background: rgba(251, 247, 238, 0.2); }
.dark-slab .kicker { color: var(--gilt); }

.work-header {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: clamp(24px, 4vw, 64px);
  align-items: end;
  margin-bottom: clamp(40px, 5vw, 72px);
}

.work-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: clamp(16px, 2vw, 28px);
  align-items: start;
}

.work-card {
  --rotate: -1.1deg;
  display: grid;
  gap: 18px;
  min-height: 420px;
  align-content: start;
  padding: clamp(20px, 2.2vw, 30px);
  border: 1px solid rgba(251, 247, 238, 0.6);
  background: var(--slab-2);
  transition: transform 300ms var(--ease-card), border-color 300ms ease, box-shadow 300ms ease;
}
.work-card:nth-child(2) { --rotate: 0.8deg; margin-top: 48px; }
.work-card:nth-child(3) { --rotate: -0.5deg; margin-top: 18px; }

.work-card--feature {
  min-height: 520px;
  background:
    radial-gradient(circle at 78% 22%, rgba(217, 107, 95, 0.9) 0 70px, transparent 71px),
    radial-gradient(circle at 78% 22%, transparent 0 96px, rgba(217, 107, 95, 0.5) 97px 98px, transparent 99px),
    var(--slab-2);
}

.work-card h3 {
  margin: auto 0 0;
  padding-top: 120px;
  font-family: var(--display);
  font-size: clamp(32px, 3vw, 48px);
  font-style: italic;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
}
.work-card p:not(.kicker) {
  margin: 0;
  color: rgba(251, 247, 238, 0.72);
  font-size: 15px;
  line-height: 1.6;
}

.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tags span {
  padding: 4px 10px;
  border: 1px solid rgba(251, 247, 238, 0.3);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(251, 247, 238, 0.8);
}

.log {
  margin: clamp(56px, 7vw, 96px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(251, 247, 238, 0.4);
}
.log li {
  display: grid;
  grid-template-columns: 120px 1fr 1fr;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px dotted rgba(251, 247, 238, 0.25);
}
.log__when {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--coral);
}
.log__what { font-family: var(--display); font-size: 22px; font-style: italic; }
.log__note { color: rgba(251, 247, 238, 0.6); font-size: 15px; }

/* ---------- 8. Contact ---------- */
.cta-panel {
  display: grid;
  gap: 28px;
  padding: clamp(28px, 5vw, 72px);
  border: 1px solid var(--ink);
  background: var(--paper-2);
  box-shadow: 0 26px 70px rgba(36, 28, 18, 0.14);
}
.cta-panel .body-copy { max-width: 36em; }

/* ---------- 9. Footer ---------- */
.footer { padding: clamp(64px, 9vw, 120px) 0 0; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--ink);
}
.footer-grid h4 {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.footer-grid p,
.footer-grid a {
  display: block;
  margin: 0 0 8px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.5;
}
.footer-grid a:hover { color: var(--coral); }

.mega {
  margin: clamp(32px, 5vw, 64px) 0 0;
  font-size: clamp(88px, 21vw, 340px);
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: -0.065em;
  white-space: nowrap;
  overflow: hidden;
  padding-bottom: 0.14em;
}

/* ---------- 10. Reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(32px) rotate(var(--rotate, 0deg));
  transition: opacity 800ms var(--ease-out), transform 800ms var(--ease-out);
}
[data-reveal].is-in {
  opacity: 1;
  transform: rotate(var(--rotate, 0deg));
}
[data-delay="1"] { transition-delay: 120ms; }
[data-delay="2"] { transition-delay: 240ms; }
[data-delay="3"] { transition-delay: 360ms; }

/* Cards: once revealed, hover gets snappy */
.work-card.is-in { transition-delay: 0ms; }
.work-card.is-in:hover {
  transform: rotate(0deg) translateY(-8px);
  border-color: var(--coral);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
}

/* ---------- 11. Responsive ---------- */
@media (max-width: 960px) {
  .hero,
  .work-header,
  .work-grid { grid-template-columns: 1fr; }
  .hero__plate { max-width: 520px; }
  .work-card:nth-child(n) { margin-top: 0; min-height: 0; }
  .work-card h3 { padding-top: 40px; }
  .work-card--feature h3 { padding-top: 160px; }
  .ledger { grid-template-columns: repeat(2, 1fr); }
  .ledger__item:nth-child(3) { border-left: 0; padding-left: 0; }
  .ledger__item:nth-child(n+3) { border-top: 1px dotted var(--rule-strong); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .shell { width: calc(100vw - 28px); }
  .issue-strip { grid-template-columns: 1fr auto; }
  .issue-strip span:nth-child(2) { display: none; }
  .nav { grid-template-columns: auto 1fr; min-height: 64px; gap: 12px; padding: 0 12px; }
  .nav-links { display: none; }
  .nav-cta { justify-self: end; }
  .text-grid { grid-template-columns: 1fr; }
  .log li { grid-template-columns: 1fr; gap: 6px; }
  .poster-footer span { display: none; }
  .poster-footer { justify-content: flex-end; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  [data-reveal] { opacity: 1; transform: rotate(var(--rotate, 0deg)); }
}