/* =========================================================
   Siyun Zheng — Portfolio
   ========================================================= */
:root {
  --paper: #EEEAE2;
  --paper-soft: #E6E2D8;
  --ink: #1A1A18;
  --ink-soft: #6B6860;
  --line: #D4D0C6;
  --accent: #5A5040;
  --font: 'Inter', 'Helvetica Neue', Arial, 'PingFang SC', sans-serif;
  --maxw: 1200px;
  --gutter: 1vw;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; background: none; border: none; color: inherit; }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: var(--paper);
  padding: 8px 14px; z-index: 200;
}
.skip-link:focus { left: 12px; top: 12px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }

/* ── NAV ── */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(238,234,226,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-nav .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.site-name { font-weight: 600; font-size: 15px; letter-spacing: 0.01em; }
.site-name .zh { color: var(--ink-soft); font-weight: 400; margin-left: 6px; }
.nav-links { display: flex; gap: 32px; font-size: 14px; }
.nav-links a {
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color .2s, border-color .2s;
}
.nav-links a:hover, .nav-links a:focus-visible { color: var(--ink); border-color: var(--ink); }

/* ── HERO ── */
.hero {
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding-top: 64px;
  padding-bottom: 80px;
  border-bottom: 1px solid var(--line);
}
.hero-eyebrow {
  font-size: 14px; color: var(--ink-soft);
  margin-bottom: 16px;
}
.hero h1 {
  font-weight: 600;
  font-size: clamp(52px, 9vw, 112px);
  line-height: 1.0;
  letter-spacing: -0.03em;
  margin-bottom: 28px;
}
.hero-tagline {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--ink-soft);
  max-width: 620px;
  margin-bottom: 64px;
  line-height: 1.5;
}
.hero-meta {
  display: flex; gap: 48px; flex-wrap: wrap;
  font-size: 13px; color: var(--ink-soft);
}
.hero-meta strong {
  display: block; color: var(--ink); font-weight: 600;
  font-size: 14px; margin-top: 4px;
}


/* ── SECTION SHELL ── */
.section {
  padding: 100px 0;
  border-bottom: 1px solid var(--line);
}
.section-head {
  display: grid; grid-template-columns: 2fr 1fr;
  gap: 24px; align-items: start;
  margin-bottom: 64px;
}
.section-eyebrow {
  font-size: 12px; letter-spacing: 0.08em;
  color: var(--ink-soft); text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-weight: 600;
  font-size: clamp(28px, 4vw, 44px);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.section-note {
  font-size: 14px; color: var(--ink-soft);
  padding-top: 8px; line-height: 1.6;
  align-self: end;
  text-align: right;
}

/* ── WORK GRID ── */
.work-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 64px 40px;
}
.work-card {
  display: block; cursor: pointer; text-align: left;
  width: 100%; background: none; border: none; padding: 0;
}
.work-thumb {
  aspect-ratio: 3/2;
  position: relative; overflow: hidden;
  margin-bottom: 16px;
  border-radius: 2px;
}
.work-thumb:hover { opacity: 0.92; }
.placeholder-label {
  display: none;
  position: absolute; left: 14px; bottom: 14px;
  font-size: 11px; color: rgba(26,26,24,0.5);
  background: rgba(238,234,226,0.75);
  padding: 3px 9px; border-radius: 2px;
}
.tone-a { background: linear-gradient(150deg, #CCC9AB, #B8B48A); }
.tone-b { background: linear-gradient(150deg, #C8C0B0, #B0A590); }
.tone-c { background: linear-gradient(150deg, #C4BAB2, #ADA098); }
.tone-d { background: linear-gradient(150deg, #C8BEAE, #B5A898); }
.tone-e { background: linear-gradient(150deg, #C8B8A0, #B5A088); }
.tone-f { background: linear-gradient(150deg, #C0BAB0, #A8A298); }

.work-cat {
  font-size: 12px; color: var(--ink-soft);
  margin-bottom: 10px; line-height: 1.4;
}
.work-title {
  font-weight: 500; font-size: 22px;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  transition: color .2s;
}
.work-card:hover .work-title { color: var(--accent); }
.work-meta {
  font-size: 12px; color: var(--ink-soft);
  letter-spacing: 0.02em; margin-bottom: 10px;
}
.work-oneliner {
  font-size: 14px; color: var(--ink-soft); line-height: 1.6;
}

/* ── ABOUT ── */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 80px; align-items: start;
}
.about-bio .section-title { margin-bottom: 28px; }
.about-bio p {
  font-size: 15px; color: var(--ink-soft);
  line-height: 1.75; margin-bottom: 20px; max-width: 540px;
}
.about-bio p:last-child { margin-bottom: 0; }

.about-side h3 {
  font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-soft); margin-bottom: 14px; margin-top: 36px;
}
.about-side h3:first-child { margin-top: 0; }

/* Education */
.edu-list { display: flex; flex-direction: column; gap: 16px; }
.edu-item { font-size: 14px; color: var(--ink-soft); line-height: 1.5; }
.edu-item strong { display: block; color: var(--ink); font-weight: 500; font-size: 14px; }
.edu-item span { display: block; font-size: 13px; }

/* Skills grid */
.skills-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.skill-group h4 {
  font-size: 14px; font-weight: 500; color: var(--ink);
  margin-bottom: 8px;
}
.skill-group p {
  font-size: 13px; color: var(--ink-soft); line-height: 1.7;
}

/* Availability */
.avail-list { font-size: 14px; color: var(--ink-soft); line-height: 1.8; }

/* ── CONTACT ── */
.contact-section {
  padding: 100px 0 80px;
}
.contact-inner {
  display: grid; grid-template-columns: 1fr auto;
  gap: 60px; align-items: center;
}
.contact-title {
  font-weight: 600;
  font-size: clamp(28px, 4.5vw, 52px);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.contact-links {
  display: flex; flex-direction: column; gap: 14px;
  font-size: 14px;
}
.contact-links a {
  display: flex; align-items: center; gap: 10px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line); padding-bottom: 14px;
  transition: color .2s, border-color .2s;
}
.contact-links a:last-child { border-bottom: none; padding-bottom: 0; }
.contact-links a:hover { color: var(--ink); border-color: var(--ink); }
.contact-links .icon { font-size: 13px; opacity: 0.6; }

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--line);
  padding: 24px 0;
}
footer .wrap {
  display: flex; justify-content: space-between;
  font-size: 12px; color: var(--ink-soft);
  flex-wrap: wrap; gap: 8px;
}

/* ── DETAIL OVERLAY ── */
.detail-overlay {
  position: fixed; inset: 0; z-index: 300;
  background: var(--paper);
  overflow-y: auto; display: none;
}
.detail-overlay.is-open { display: block; }
.detail-bar {
  position: sticky; top: 0; z-index: 5;
  background: rgba(238,234,226,0.95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}
.detail-bar .wrap {
  height: 64px; display: flex;
  align-items: center; justify-content: space-between;
}
.detail-close {
  font-size: 13px; border: 1px solid var(--line);
  padding: 7px 14px; border-radius: 2px;
  transition: border-color .2s, background .2s;
}
.detail-close:hover { border-color: var(--ink); background: var(--paper-soft); }
.detail-body { padding: 64px 0 110px; }
.detail-hero-thumb {
  aspect-ratio: 16/9; border-radius: 2px;
  margin-bottom: 48px; position: relative; overflow: hidden;
}
.detail-eyebrow {
  display: flex; gap: 14px; flex-wrap: wrap;
  font-size: 12px; color: var(--ink-soft); margin-bottom: 12px;
}
.detail-title {
  font-weight: 600;
  font-size: clamp(28px, 5vw, 52px);
  letter-spacing: -0.02em; margin-bottom: 8px;
}
.detail-meta {
  font-size: 12px; color: var(--ink-soft);
  letter-spacing: 0.04em; margin-bottom: 32px;
}
.detail-oneliner {
  font-size: 18px; color: var(--ink-soft);
  max-width: 640px; margin-bottom: 56px; line-height: 1.6;
}
.detail-row {
  display: grid; grid-template-columns: 180px 1fr;
  gap: 24px; padding: 28px 0;
  border-top: 1px solid var(--line);
}
.detail-row:last-of-type { border-bottom: 1px solid var(--line); }
.detail-row dt {
  font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--ink-soft); padding-top: 3px;
}
.detail-row dd { font-size: 15px; line-height: 1.7; max-width: 600px; }
.detail-tools {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 40px;
}
.detail-tools span {
  font-size: 12px; border: 1px solid var(--line);
  padding: 5px 12px; border-radius: 20px; color: var(--ink-soft);
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .work-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .skills-grid { grid-template-columns: 1fr; }
  .contact-inner { grid-template-columns: 1fr; gap: 40px; }
  .section-head { grid-template-columns: 1fr; }
  .detail-row { grid-template-columns: 1fr; gap: 8px; }
}
@media (max-width: 560px) {
  :root { --gutter: 5vw; }
  .nav-links { gap: 18px; font-size: 13px; }
  .section { padding: 72px 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}
/* ── detail media ── */
.detail-media-section {
  margin-top: 56px;
}
.detail-video {
  width: 100%;
  border-radius: 2px;
  display: block;
  background: #000;
}
.detail-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 24px;
}
.detail-gallery img {
  width: 100%;
  aspect-ratio: 3/2;
  object-fit: cover;
  border-radius: 2px;
  display: block;
}
@media (max-width: 600px) {
  .detail-gallery { grid-template-columns: 1fr; }
}

/* ── media carousel ── */
.detail-carousel {
  margin-bottom: 48px;
  position: relative;
}
.detail-carousel-track {
  position: relative;
  width: 100%;
  height: 500px;
  overflow: hidden;
}
.detail-slide {
  position: absolute;
  top: 50%; left: 50%;
  width: 65%;
  transform: translate(-50%, -50%) scale(0.82);
  transition: all 0.5s ease;
  opacity: 0.45;
  filter: blur(3px);
  border-radius: 4px;
  overflow: hidden;
  z-index: 1;
}
.detail-slide.is-active {
  transform: translate(-50%, -50%) scale(1);
  opacity: 1; filter: none; z-index: 3;
}
.detail-slide.is-prev {
  transform: translate(calc(-50% - 58%), -50%) scale(0.82);
  opacity: 0.55; filter: blur(2px); z-index: 2;
}
.detail-slide.is-next {
  transform: translate(calc(-50% + 58%), -50%) scale(0.82);
  opacity: 0.55; filter: blur(2px); z-index: 2;
}
.detail-slide img {
  width: 100%;
  height: auto;
  max-height: 600px;
  object-fit: contain;
  display: block;
  background: var(--paper);
}
.detail-slide video {
  width: 100%; max-height: 400px;
  display: block; background: #000;
}
.detail-carousel-controls {
  display: flex; align-items: center;
  justify-content: center; gap: 16px;
  margin-top: 20px;
}
.carousel-btn {
  font-size: 18px; padding: 8px 16px;
  border: 1px solid var(--line); border-radius: 2px;
  cursor: pointer; background: none;
  transition: border-color .2s, background .2s;
}
.carousel-btn:hover { border-color: var(--ink); background: var(--paper-soft); }
.carousel-dots {
  display: flex; gap: 6px; align-items: center;
}
.carousel-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--line); border: none; padding: 0; cursor: pointer;
  transition: background .2s, transform .2s;
}
.carousel-dot.is-active {
  background: var(--ink); transform: scale(1.3);
}
/* ── Project Evolution ── */
.project-evolution {
  margin: 56px 0;
  padding: 40px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.evolution-heading {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-bottom: 32px;
}
.evolution-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.evolution-img {
  aspect-ratio: 4/3;
  border-radius: 2px;
  margin-bottom: 16px;
  background-color: var(--paper-soft);
}
.evolution-img--placeholder {
  background: linear-gradient(150deg, #C8C0B0, #B0A590);
}
.evolution-meta {
  display: flex;
  gap: 12px;
  align-items: baseline;
  margin-bottom: 8px;
}
.evolution-number {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  text-transform: uppercase;
}
.evolution-year {
  font-size: 12px;
  color: var(--ink-soft);
}
.evolution-title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
  color: var(--ink);
}
.evolution-description {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}
.evolution-transition {
  grid-column: 1 / -1;
  font-size: 13px;
  color: var(--ink-soft);
  font-style: italic;
  text-align: center;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: 8px 0;
}
@media (max-width: 700px) {
  .evolution-grid { grid-template-columns: 1fr; }
  .evolution-transition { grid-column: 1; }
}
/* ── Archive layout ── */
.archive-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 56px 40px;
  margin-top: 56px;
}
.archive-img {
  aspect-ratio: 4/3;
  border-radius: 2px;
  margin-bottom: 14px;
  background-color: var(--paper-soft);
}
.archive-img--placeholder {
  background: linear-gradient(150deg, #C8BEAE, #B5A898);
}
.archive-img-extra {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 8px;
  margin-bottom: 14px;
}
.archive-img-extra img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: 2px;
  display: block;
}
.archive-meta {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--ink-soft);
  margin-bottom: 8px;
}
.archive-type {
  color: var(--ink-soft);
}
.archive-item-title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  color: var(--ink);
}
.archive-item-desc {
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.65;
  margin-bottom: 12px;
}
.archive-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.archive-tags span {
  font-size: 11px;
  border: 1px solid var(--line);
  padding: 3px 9px;
  border-radius: 20px;
  color: var(--ink-soft);
}
@media (max-width: 700px) {
  .archive-grid { grid-template-columns: 1fr; }
}