/* ============================================================
   HAI DANG — portfolio
   Quiet, banded version.
   Section bands: paper (intro) → white (index) → moss tint
   (research, full-width asymmetric grid) → teal (now) →
   deep teal (footer).
   Palette (70/20/10):
     neutral  #F6FBF1 paper, #FFFFFF white, #14262A ink
     accent   #003A41 deep teal, #E9F3DF moss, #CBE5C2 evergreen
   Type: Spline Sans (body) · Archivo (headings, sentence case)
         Spline Sans Mono (index, meta)
   No shadows, no gradients, flat surfaces only.
   ============================================================ */

:root {
  --paper: #F6FBF1;
  --white: #FFFFFF;
  --moss: #E7F1DC;
  --ink: #14262A;
  --ink-soft: #4A5D5F;
  --teal: #003A41;
  --teal-deep: #04282C;
  --evergreen: #CBE5C2;
  --pale-onDark: #D3E4CC;
  --line: #D6E4CF;
  --gap: 6px;
  --pad: clamp(20px, 4vw, 48px);
  --maxw: 1080px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Spline Sans", sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
}

img, video { display: block; max-width: 100%; }

a { color: inherit; }

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

h1, h2, h3 {
  font-family: "Archivo", sans-serif;
  font-weight: 600;
  line-height: 1.15;
  color: var(--teal);
}

h2 { font-size: clamp(24px, 2.6vw, 32px); }

/* ---------- nav ---------- */

.nav {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 16px var(--pad);
  font-family: "Spline Sans Mono", monospace;
  font-size: 13px;
  color: var(--ink);
}

.nav-name { white-space: nowrap; font-weight: 500; }

.nav a { text-decoration: none; }
.nav a:hover { color: var(--teal); text-decoration: underline; text-underline-offset: 4px; }

.nav-links { display: flex; gap: clamp(12px, 2.5vw, 28px); flex-wrap: wrap; justify-content: flex-end; }

/* ---------- intro (hero) ---------- */

.intro {
  max-width: 980px;
  margin: 0 auto;
  padding: 10vh var(--pad) 12vh;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(24px, 5vw, 72px);
}

.intro-text { max-width: 560px; }

.intro h1 { font-size: clamp(28px, 3vw, 36px); margin-bottom: 28px; }

.intro p { margin-bottom: 1.2em; }
.intro p:last-child { margin-bottom: 0; color: var(--ink-soft); }

.intro-avatar {
  width: clamp(200px, 26vw, 330px);
  height: auto;
  flex: none;
}

/* ---------- index ---------- */

.index-section {
  background: var(--white);
  padding: 10vh var(--pad);
}

.index-inner { max-width: var(--maxw); margin: 0 auto; }

.index-section h2 { margin-bottom: 24px; }

.index-list { list-style: none; border-top: 1px solid var(--line); }

.index-list a,
.index-list .ix-row {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 16px;
  align-items: baseline;
  padding: 11px 4px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  font-family: "Spline Sans Mono", monospace;
  font-size: 14px;
}

.index-list a:hover { background: var(--paper); }

.ix-year { color: var(--ink-soft); }
.ix-title { font-weight: 400; }
.ix-venue { color: var(--ink-soft); font-size: 12.5px; text-align: right; }

/* ---------- research: full-width asymmetric grid ---------- */

.work-section {
  background: var(--moss);
  padding: 10vh var(--pad) 12vh;
}

.work-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px 48px;
  margin-bottom: 56px;
}

.section-note {
  max-width: 58ch;
  color: var(--ink-soft);
}

.paper-grid { display: flex; flex-direction: column; gap: var(--gap); }

.pg-cols { display: flex; gap: var(--gap); align-items: flex-start; }

.pg-col { display: flex; flex-direction: column; gap: var(--gap); min-width: 0; }

.pg-left { flex: 7; }
.pg-right { flex: 5; }

/* feature card: image left aligns with the column seam below */
.pg-feature .card { flex-direction: row; align-items: stretch; }

.pg-feature .card img {
  width: calc((100% - var(--gap)) * 7 / 12);
  flex: none;
  align-self: center;
  padding: 14px 0 14px 14px;
}

.pg-feature .card-body { flex: 1; justify-content: center; }

.card {
  background: var(--white);
  display: flex;
  flex-direction: column;
}

.card img { width: 100%; height: auto; padding: 14px 14px 0; }

.card-body {
  padding: 18px 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.card-meta {
  font-family: "Spline Sans Mono", monospace;
  font-size: 12px;
  color: var(--ink-soft);
}

.card h3 { font-size: 20px; }

.card-desc { color: var(--ink-soft); font-size: 15.5px; }

.card-links {
  font-family: "Spline Sans Mono", monospace;
  font-size: 13.5px;
  margin-top: auto;
  padding-top: 10px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.card-links a { color: var(--teal); text-decoration: none; }
.card-links a:hover { text-decoration: underline; text-underline-offset: 4px; }

/* the one text-only card sits on teal */
.card-teal { background: var(--teal); }
.card-teal h3 { color: var(--evergreen); }
.card-teal .card-meta, .card-teal .card-desc { color: var(--pale-onDark); }
.card-teal .card-links a { color: var(--evergreen); }

/* ---------- now ---------- */

.now-section {
  background: var(--paper);
  padding: 10vh var(--pad) 12vh;
}

.now-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(24px, 5vw, 72px);
}

.now-text { max-width: 480px; }

.now-section h2 { margin-bottom: 24px; }

.now-section p { margin-bottom: 0; color: var(--ink-soft); }

.now-avatar {
  width: clamp(200px, 24vw, 300px);
  height: auto;
  flex: none;
}

/* ---------- site end (inside now) ---------- */

.site-end { margin-top: 9vh; }

.footer-links {
  list-style: none;
  display: flex;
  gap: clamp(16px, 3vw, 32px);
  flex-wrap: wrap;
  font-family: "Spline Sans Mono", monospace;
  font-size: 13px;
  color: var(--teal);
}

.footer-links a { text-decoration: none; }
.footer-links a:hover { text-decoration: underline; text-underline-offset: 4px; }

.footer-colophon {
  margin-top: 24px;
  font-family: "Spline Sans Mono", monospace;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  line-height: 2;
  color: #8AA294;
}

/* ---------- responsive ---------- */

@media (max-width: 720px) {
  .pg-cols { flex-direction: column; }
  .pg-col { width: 100%; }
  .pg-feature .card { flex-direction: column; }
  .pg-feature .card img { width: 100%; padding: 14px 14px 0; }
  .intro { flex-direction: column-reverse; align-items: flex-start; padding-top: 4vh; }
  .now-inner { flex-direction: column; align-items: flex-start; }
  .index-list a { grid-template-columns: 52px 1fr; }
  .ix-venue { grid-column: 2; text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}