:root {
  --ink: #11110f;
  --paper: #f0eee8;
  --muted: #8a867e;
  --line: rgba(240, 238, 232, 0.22);
  --red: #b53226;
  --font-cn: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--ink);
  color: var(--paper);
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--ink);
  font-family: var(--font-cn);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.icon-arrow {
  --arrow-rotation: 0deg;
  position: relative;
  display: inline-block;
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  color: currentColor;
  font-size: 0;
  line-height: 0;
  transform: rotate(var(--arrow-rotation));
  transition: color .2s ease, transform .25s ease;
}
.icon-arrow::before {
  content: "";
  position: absolute;
  top: 7px;
  left: 2px;
  width: 12px;
  height: 1.5px;
  background: currentColor;
}
.icon-arrow::after {
  content: "";
  position: absolute;
  top: 4px;
  right: 1px;
  width: 6px;
  height: 6px;
  border-top: 1.5px solid currentColor;
  border-right: 1.5px solid currentColor;
  transform: rotate(45deg);
}
.icon-arrow--ne { --arrow-rotation: -45deg; }
.icon-arrow--down { --arrow-rotation: 90deg; }
.icon-arrow--left { --arrow-rotation: 180deg; }

button,
select {
  font: inherit;
}

[hidden] {
  display: none !important;
}

.project-header {
  display: flex;
  min-height: 88px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 clamp(22px, 4vw, 68px);
  border-bottom: 1px solid var(--line);
}

.project-brand {
  display: block;
}

.project-brand img {
  display: block;
  width: clamp(142px, 13vw, 174px);
  height: auto;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: #c9c5bd;
  font-size: 10px;
  letter-spacing: 0.12em;
}
.back-link:hover .icon-arrow,
.back-link:focus-visible .icon-arrow {
  transform: translateX(-3px) rotate(var(--arrow-rotation));
}

.project-page {
  width: 100%;
}

.project-intro,
.project-notes,
.not-found {
  padding: clamp(70px, 9vw, 145px) clamp(24px, 7vw, 118px);
}

.project-kicker {
  margin: 0;
  color: var(--red);
  font: 700 9px/1.4 Arial, sans-serif;
  letter-spacing: 0.22em;
}

.project-intro h1 {
  max-width: 1300px;
  margin: 45px 0 55px;
  font: 400 clamp(58px, 9.5vw, 150px)/1.03 var(--font-cn);
  letter-spacing: -0.055em;
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  color: #a5a198;
  font: 9px/1.4 monospace;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.project-meta span + span::before {
  content: "·";
  margin: 0 16px;
  color: #5e5b55;
}

.viewer-section {
  padding: 0 clamp(12px, 3.2vw, 54px);
}

.project-viewer,
.project-still {
  position: relative;
  width: 100%;
  margin: 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #000;
}

.project-viewer video,
.project-still img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
}

.project-still img {
  object-fit: cover;
}

.viewer-tools {
  position: absolute;
  z-index: 3;
  top: 18px;
  right: 18px;
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.quality-control,
.fullscreen-button {
  min-height: 43px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  background: rgba(17, 17, 15, 0.78);
  color: #f0eee8;
  backdrop-filter: blur(12px);
}

.quality-control {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
}

.quality-control span {
  color: #a5a198;
  font-size: 8px;
  letter-spacing: 0.12em;
}

.quality-control select {
  border: 0;
  outline: 0;
  background: transparent;
  color: #f0eee8;
  font-size: 10px;
}

.fullscreen-button {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  padding: 0 16px;
  font-size: 9px;
  letter-spacing: 0.12em;
}
.fullscreen-button:hover .icon-arrow,
.fullscreen-button:focus-visible .icon-arrow {
  transform: translate(3px, -3px) rotate(var(--arrow-rotation));
}

.fullscreen-button:hover,
.fullscreen-button:focus-visible {
  border-color: var(--red);
  background: rgba(181, 50, 38, 0.88);
}

.video-message {
  position: absolute;
  z-index: 3;
  left: 18px;
  bottom: 12px;
  margin: 0;
  color: #f0eee8;
  font-size: 11px;
}

.project-viewer:fullscreen {
  width: 100vw;
  height: 100vh;
  aspect-ratio: auto;
}

.project-viewer:fullscreen video {
  width: 100vw;
  height: 100vh;
}

.project-notes {
  display: grid;
  grid-template-columns: minmax(160px, 0.55fr) minmax(300px, 1.45fr);
  gap: clamp(55px, 10vw, 170px);
}

.project-description {
  max-width: 880px;
  margin: 0;
  color: #d0ccc3;
  font: 400 clamp(22px, 2.5vw, 38px)/1.75 var(--font-cn);
}

.project-actions {
  grid-column: 2;
  display: flex;
  justify-content: space-between;
  gap: 25px;
  max-width: 880px;
  padding-top: 38px;
  border-top: 1px solid var(--line);
  color: #aaa69d;
  font-size: 10px;
  letter-spacing: 0.12em;
}
.project-actions a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.project-actions a:hover .icon-arrow--ne,
.project-actions a:focus-visible .icon-arrow--ne {
  transform: translate(3px, -3px) rotate(var(--arrow-rotation));
}
.project-actions a:hover .icon-arrow--down,
.project-actions a:focus-visible .icon-arrow--down {
  transform: translateY(3px) rotate(var(--arrow-rotation));
}

.not-found {
  min-height: calc(100vh - 160px);
}

.not-found h1 {
  margin: 55px 0 25px;
  font: 400 clamp(48px, 7vw, 104px)/1.08 var(--font-cn);
  letter-spacing: -0.05em;
}

.not-found > p:not(.project-kicker) {
  color: var(--muted);
}

.not-found > a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 40px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--red);
  font-size: 11px;
  letter-spacing: 0.12em;
}
.not-found > a:hover .icon-arrow,
.not-found > a:focus-visible .icon-arrow {
  transform: translateX(3px) rotate(var(--arrow-rotation));
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 25px clamp(22px, 4vw, 68px);
  border-top: 1px solid var(--line);
  color: #77736c;
  font-size: 8px;
  letter-spacing: 0.12em;
}

footer p {
  margin: 0;
}

footer a {
  color: #b9b5ad;
}

@media (max-width: 720px) {
  .project-header {
    min-height: 76px;
  }

  .project-brand span {
    display: none;
  }

  .project-intro,
  .project-notes,
  .not-found {
    padding: 70px 24px;
  }

  .project-intro h1 {
    margin: 36px 0 42px;
    font-size: clamp(42px, 12vw, 54px);
  }

  .viewer-section {
    padding: 0;
  }

  .viewer-tools {
    top: 10px;
    right: 10px;
  }

  .quality-control span {
    display: none;
  }

  .fullscreen-button {
    padding: 0 12px;
  }

  .project-notes {
    grid-template-columns: 1fr;
    gap: 45px;
  }

  .project-actions {
    grid-column: 1;
    flex-direction: column;
  }

  footer {
    flex-wrap: wrap;
  }
}

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