/* ============ 设计语言：现代美术馆 · 夜场 ============
   近黑底 / 暖白文字 / 克莱因蓝点缀
   克制的精致字标 + 硬边卡片（细线描边、偏移阴影） */
:root {
  --bg: #0d0d0f;
  --surface: #141416;
  --ink: #eceae5;
  --ink-dim: #8b8983;
  --blue: #4d5dfa;          /* 克莱因蓝（暗底提亮） */
  --line: #2b2b2f;
  --line-strong: #3a3a40;
  --font-sans: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, monospace;
}

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

html { color-scheme: dark; }

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

/* ============ 顶栏 ============ */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.1rem clamp(1.2rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}

.topbar-logo { font-weight: 600; font-size: 0.95rem; letter-spacing: 0.02em; }

.topbar-right {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.topbar-note { color: var(--ink-dim); }

/* ============ 语言切换 ============ */
.lang-switcher { display: inline-flex; }

.lang-btn {
  appearance: none;
  background: none;
  border: 1px solid transparent;
  color: var(--ink-dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.22rem 0.5rem;
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.lang-btn:hover { color: var(--ink); }

.lang-btn:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 1px;
  color: var(--ink);
}

.lang-btn.is-active {
  color: var(--ink);
  border-color: var(--line-strong);
}

/* ============ Hero：精致字标 ============ */
.hero {
  padding: clamp(3.5rem, 10vh, 7rem) clamp(1.2rem, 4vw, 3rem) 0;
}

.hero-wordmark {
  font-size: clamp(2.6rem, 7vw, 5.2rem);
  line-height: 1;
  font-weight: 300;             /* 细字重，更精致 */
  letter-spacing: 0.01em;
  user-select: none;
}

.hero-line {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin: 1.4rem 0 3rem;
  font-family: var(--font-mono);
  font-size: clamp(0.68rem, 1.4vw, 0.8rem);
  letter-spacing: 0.16em;
  color: var(--ink-dim);
}

.asterisk {
  display: inline-block;
  color: var(--blue);
  font-size: 1.25em;
  animation: spin 16s linear infinite;
}

.play-link {
  margin-left: 1rem;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.1em;
  transition: border-color 0.2s ease;
}

.play-link:hover { border-color: var(--ink-dim); }

.play-link:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* 尊重系统「减少动态效果」设置 */
@media (prefers-reduced-motion: reduce) {
  .asterisk, .marquee-track, .gallery-empty .glyph { animation: none !important; }
  .work-card, .work-cover, .work-cover-placeholder, .work-title::after, .lang-btn {
    transition: none !important;
  }
}

/* ============ 无障碍：跳转链接 ============ */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -100%;
  z-index: 10;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-decoration: none;
}

.skip-link:focus-visible {
  top: 1rem;
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* ============ 跑马灯分隔带 ============ */
.marquee {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  white-space: nowrap;
  padding: 0.55rem 0;
  color: var(--ink-dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
}

.marquee-track {
  display: inline-block;
  animation: slide 32s linear infinite;
}

.marquee-track span { display: inline-block; }

@keyframes slide { to { transform: translateX(-50%); } }

/* ============ 画廊 ============ */
.gallery {
  flex: 1;
  width: 100%;
  padding: clamp(2rem, 5vh, 3.5rem) clamp(1.2rem, 4vw, 3rem) 4rem;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
  gap: clamp(1.2rem, 3vw, 2rem);
}

.work-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  transition: border-color 0.25s ease;
}

/* 悬停：仅描边提亮 + 封面微微聚焦，不引入新颜色 */
.work-card:hover {
  border-color: var(--ink-dim);
}

.work-card:hover .work-cover,
.work-card:hover .work-cover-placeholder {
  opacity: 1;
}

.work-card:hover .work-title::after {
  transform: scaleX(1);
}

/* 键盘聚焦：清晰的蓝色外描边（无障碍焦点指示） */
.work-card:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-color: var(--ink-dim);
}

.work-cover {
  aspect-ratio: 4 / 3;
  width: 100%;
  object-fit: cover;
  display: block;
  border-bottom: 1px solid var(--line-strong);
  background: var(--bg);
  opacity: 0.88;
  transition: opacity 0.25s ease;
}

/* 无封面时的占位：JS 填充平涂色块与首字 */
.work-cover-placeholder {
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.6rem;
  font-weight: 600;
  border-bottom: 1px solid var(--line-strong);
  opacity: 0.88;
  transition: opacity 0.25s ease;
}

.work-meta { padding: 1rem 1.1rem 1.2rem; }

.work-title {
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* 标题下划线：悬停时从左展开 */
.work-title::after {
  content: "";
  display: block;
  height: 1px;
  margin-top: 0.3rem;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.work-desc {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--ink-dim);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.work-tags {
  margin-top: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
}

.work-type {
  border: 1px solid var(--line-strong);
  padding: 0.18rem 0.55rem;
  text-transform: uppercase;
  color: var(--ink);
}

.work-type--interactive {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

/* ============ 空状态 / 错误 ============ */
.gallery-empty {
  min-height: 34vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  text-align: center;
  color: var(--ink-dim);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
}

.gallery-empty .glyph {
  font-size: 2.6rem;
  color: var(--blue);
  animation: spin 16s linear infinite;
}

/* ============ 页脚 ============ */
.site-footer {
  padding: 1.4rem 2rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--ink-dim);
  text-align: center;
}

.footer-line {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.8rem;
}

.footer-dot { color: var(--blue); }

.footer-rights {
  margin-top: 0.6rem;
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  opacity: 0.75;
}

/* ============ 小屏适配 ============ */
@media (max-width: 640px) {
  .topbar {
    padding: 0.9rem 1.1rem;
  }

  .topbar-note { font-size: 0.68rem; }

  .topbar-right { gap: 0.6rem; }

  .hero {
    padding: 2.6rem 1.1rem 0;
  }

  .hero-wordmark { font-size: clamp(2.4rem, 13vw, 3.2rem); }

  .hero-line {
    margin: 1.1rem 0 2rem;
    gap: 0.55rem;
    letter-spacing: 0.1em;
    flex-wrap: wrap;
  }

  .marquee { font-size: 0.66rem; padding: 0.45rem 0; }

  .gallery {
    padding: 1.6rem 1.1rem 3rem;
  }

  .gallery-grid { gap: 1.1rem; }

  .work-cover-placeholder { font-size: 3rem; }

  .work-meta { padding: 0.9rem 1rem 1.05rem; }

  .site-footer {
    padding: 1.2rem 1.1rem;
    line-height: 1.6;
  }

  .footer-line {
    flex-direction: column;
    gap: 0.45rem;
  }

  .footer-dot { display: none; }
}

/* 超窄屏（小手机竖屏）：顶栏叠放 */
@media (max-width: 400px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
}