/* ==========================================================================
   Zhen Yang Soh — personal site
   Editorial light. Warm paper, near-black ink, one accent.
   Serif display (Newsreader) · neutral sans body (Inter) · mono for technical labels.
   ========================================================================== */

/* ---------- Tokens ---------- */
:root {
  --paper:      #FBFAF8;
  --paper-sunk: #F4F2ED;
  --ink:        #131210;
  --ink-2:      #55514A;
  --ink-3:      #8C877D;
  --rule:       #E5E1D8;
  --rule-firm:  #CFC9BC;
  --accent:     #B3411F;
  --accent-ink: #8E3317;

  --font-display: "Newsreader", Georgia, "Times New Roman", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --measure: 68ch;
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --max: 1240px;

  --step-0: 1rem;
  --step-1: 1.125rem;
  --step-2: clamp(1.35rem, 1.1rem + 1vw, 1.75rem);
  --step-3: clamp(1.75rem, 1.3rem + 2vw, 2.5rem);
  --step-4: clamp(2.25rem, 1.4rem + 4vw, 3.75rem);
  --step-5: clamp(2.75rem, 1.4rem + 6vw, 5.25rem);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.6;
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { margin: 0; font-weight: 400; line-height: 1.12; letter-spacing: -0.015em; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

/* ---------- Layout ---------- */
.wrap {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: clamp(3.5rem, 8vw, 7rem); }
.section--tight { padding-block: clamp(2.5rem, 5vw, 4rem); }
.rule-top { border-top: 1px solid var(--rule); }

/* Section header: numbered eyebrow + label, Swiss style */
.sec-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding-bottom: 1.25rem;
  margin-bottom: clamp(2rem, 4vw, 3.25rem);
  border-bottom: 1px solid var(--rule);
}
.sec-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.sec-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  white-space: nowrap;
}

/* ---------- Site header ---------- */
.masthead {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color .45s ease, border-color .45s ease, backdrop-filter .45s ease;
}
/* Gains a ground only once you have scrolled off the opening frame. */
.masthead.is-stuck {
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom-color: var(--rule);
}
/* Inner pages have no full-bleed opening, so they reserve space for the bar. */
body.has-topbar { padding-top: 4.25rem; }
.masthead__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 4.25rem;
}
.wordmark {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  white-space: nowrap;
}
.wordmark span { color: var(--ink-3); }
.nav { display: flex; gap: clamp(1rem, 2.5vw, 2rem); align-items: center; }
.nav a {
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--ink-2);
  padding-block: 0.35rem;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.nav a:hover { color: var(--ink); border-bottom-color: var(--accent); }
.nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--ink); }

/* ---------- Hero ---------- */
.hero { padding-block: clamp(3.5rem, 10vw, 8rem) clamp(2.5rem, 6vw, 5rem); }
.hero__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}
.hero__meta .dot { color: var(--rule-firm); }
.hero__name {
  font-family: var(--font-display);
  font-size: var(--step-5);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 0.95;
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}
.hero__lede {
  font-family: var(--font-display);
  font-size: var(--step-3);
  line-height: 1.32;
  letter-spacing: -0.015em;
  max-width: 24ch;
  margin-bottom: 1.5rem;
}
.hero__sub {
  font-size: var(--step-1);
  line-height: 1.62;
  color: var(--ink-2);
  max-width: 58ch;
}
.hero__sub strong { color: var(--ink); font-weight: 500; }

/* ---------- Stat row ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  border-top: 1px solid var(--rule);
}
.stat {
  padding: clamp(1.5rem, 3vw, 2.25rem) 0;
  padding-right: 1.5rem;
  border-bottom: 1px solid var(--rule);
}
.stat__fig {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.875rem);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 0.625rem;
}
.stat__fig em { font-style: normal; color: var(--accent); }
.stat__label {
  font-size: 0.875rem;
  line-height: 1.45;
  color: var(--ink-2);
  max-width: 28ch;
}
.stat__note {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  margin-top: 0.5rem;
}

/* ---------- Work cards ---------- */
.work-list { display: grid; gap: 0; }
.work-item {
  display: grid;
  grid-template-columns: 5.5rem 1fr minmax(0, 7rem);
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: start;
  padding-block: clamp(1.75rem, 3.5vw, 2.75rem);
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  transition: background-color .2s ease;
}
.work-item:first-child { border-top: 1px solid var(--rule); }
.work-item:hover { background: var(--paper-sunk); }
.work-item:hover .work-item__title { color: var(--accent); }
.work-item:hover .work-item__go { transform: translateX(4px); opacity: 1; }
.work-item__idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  padding-top: 0.5rem;
}
.work-item__title {
  font-family: var(--font-display);
  font-size: var(--step-2);
  letter-spacing: -0.02em;
  margin-bottom: 0.625rem;
  transition: color .18s ease;
}
.work-item__desc {
  color: var(--ink-2);
  font-size: 0.9375rem;
  line-height: 1.6;
  max-width: 62ch;
  margin-bottom: 1rem;
}
.work-item__go {
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--ink-2);
  opacity: .55;
  padding-top: 0.5rem;
  white-space: nowrap;
  transition: transform .2s ease, opacity .2s ease;
}
.work-item__status {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-ink);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 2px;
  padding: 0.125rem 0.4rem;
  margin-left: 0.625rem;
  vertical-align: 0.22em;
}

/* Tag strip (stack chips) */
.tags { display: flex; flex-wrap: wrap; gap: 0.375rem 0.5rem; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  background: var(--paper-sunk);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 0.1875rem 0.5rem;
}

/* ---------- Prose ---------- */
.prose { max-width: var(--measure); }
.prose p + p { margin-top: 1.125rem; }
.prose h3 {
  font-family: var(--font-display);
  font-size: var(--step-2);
  margin-top: 2.75rem;
  margin-bottom: 0.875rem;
}
.prose a { color: var(--accent-ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }

/* ---------- Film collage ---------- */
.collage {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(0.5rem, 1.2vw, 0.875rem);
}
.frame {
  position: relative;
  overflow: hidden;
  background: var(--paper-sunk);
  border: 1px solid var(--rule);
}
.frame img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s cubic-bezier(.2,.7,.3,1); }
.frame:hover img { transform: scale(1.03); }
.frame--wide { grid-column: span 8; aspect-ratio: 16 / 9; }
.frame--tall { grid-column: span 4; aspect-ratio: 4 / 5; }
.frame--half { grid-column: span 6; aspect-ratio: 3 / 2; }
.frame--third { grid-column: span 4; aspect-ratio: 3 / 2; }
.frame--full { grid-column: span 12; aspect-ratio: 21 / 9; }
.frame__ph {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ---------- Footer ---------- */
.foot { border-top: 1px solid var(--rule); padding-block: clamp(3rem, 6vw, 5rem) 2.5rem; }
.foot__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}
.foot__cta {
  font-family: var(--font-display);
  font-size: var(--step-3);
  letter-spacing: -0.02em;
  line-height: 1.2;
  max-width: 18ch;
}
.linklist li { margin-bottom: 0.625rem; }
.linklist a {
  font-size: 0.9375rem;
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-firm);
  padding-bottom: 1px;
  transition: color .18s ease, border-color .18s ease;
}
.linklist a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.foot__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  text-transform: uppercase;
}

/* ---------- Inline link style ---------- */
.ilink {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 1px;
  transition: color .18s ease;
}
.ilink:hover { color: var(--accent); }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .work-item { grid-template-columns: 2.75rem 1fr; }
  .work-item__go { display: none; }
  .frame--wide, .frame--tall, .frame--half, .frame--third { grid-column: span 6; }
  .frame--wide { aspect-ratio: 3 / 2; }
  .nav { gap: 1rem; }
  .nav a { font-size: 0.75rem; }
}
@media (max-width: 460px) {
  .masthead__inner { flex-direction: column; align-items: flex-start; gap: 0.25rem; padding-block: 0.75rem; }
  .nav { width: 100%; justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}