/* 只用系统字体，不引用任何境外 CDN / Google Fonts，保证国内访问速度 */
:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #8a8a8a;
  --line: #e8e8e8;
  --placeholder: #f2f1ef;
  --overlay: rgba(10, 10, 10, 0.72);
  --max: 1440px;
  --gutter: 40px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }

/* ---------- 页眉 ---------- */
.site-header {
  max-width: var(--max);
  margin: 0 auto;
  padding: 36px var(--gutter) 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; font-weight: 600; letter-spacing: .08em; }
.brand img { height: 44px; width: auto; }
.brand .brand-text { font-size: 17px; }
.nav { display: flex; flex-wrap: wrap; gap: 6px 28px; font-size: 14px; }
.nav a { color: var(--fg); opacity: .75; transition: opacity .2s; white-space: nowrap; }
.nav a:hover { opacity: 1; }

/* ---------- 作品网格 ---------- */
.grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.card { position: relative; display: block; overflow: hidden; background: var(--placeholder); }
.card .thumb { aspect-ratio: 202 / 158; width: 100%; object-fit: cover; transition: transform .6s ease; }
.card .ph {
  aspect-ratio: 202 / 158; display: flex; align-items: center; justify-content: center;
  padding: 20px; text-align: center; font-size: 20px; letter-spacing: .1em; color: #b4b0aa;
}
.card .meta {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center; padding: 20px;
  background: var(--overlay); color: #fff; opacity: 0; transition: opacity .3s ease;
}
.card .meta .t { font-size: 18px; letter-spacing: .06em; }
.card .meta .y { font-size: 13px; opacity: .7; margin-top: 4px; }
.card:hover .meta, .card:focus-visible .meta { opacity: 1; }
.card:hover .thumb { transform: scale(1.03); }

/* ---------- 项目详情 ---------- */
.project { max-width: 1200px; margin: 0 auto; padding: 24px var(--gutter) 0; }
.project-head { text-align: center; margin: 24px 0 48px; }
.project-head h1 { font-size: 30px; font-weight: 500; letter-spacing: .08em; margin: 0; }
.project-head .y { color: var(--muted); margin-top: 6px; }
.project-text {
  max-width: 760px; margin: 0 auto 24px; padding: 0;
  font-size: 15px; line-height: 1.8; font-weight: 300; color: #333; letter-spacing: .02em;
  text-align: justify; text-justify: inter-character;
}
.project-text p { margin: 0 0 1.25em; }
.project-text p:last-child { margin-bottom: 0; }
.project-text a, .media-fig figcaption a { color: inherit; text-decoration: underline; text-underline-offset: 3px; }
.project-media { display: flex; flex-direction: column; gap: 24px; }
.project-media img { width: 100%; background: var(--placeholder); }
.project-media .video { width: 100%; margin: 20px 0; background: #000; }
.project-media .embed { position: relative; aspect-ratio: 16 / 9; margin: 20px 0; }
.project-media .embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.empty-note {
  text-align: center; color: var(--muted); padding: 80px 20px;
  background: var(--placeholder);
}
.pager {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 16px;
  max-width: 1200px; margin: 64px auto 0; padding: 28px var(--gutter);
  border-top: 1px solid var(--line); font-size: 14px;
}
.pager .prev { justify-self: start; }
.pager .all { justify-self: center; color: var(--muted); }
.pager .next { justify-self: end; text-align: right; }
.pager a:hover { opacity: .6; }

/* ---------- 页脚 ---------- */
.site-footer {
  max-width: var(--max); margin: 80px auto 0; padding: 40px var(--gutter) 48px;
  text-align: center; font-size: 13px; color: var(--muted);
}
.site-footer .tagline { color: var(--fg); font-size: 15px; letter-spacing: .1em; margin-bottom: 18px; }
.site-footer .beian { display: flex; justify-content: center; flex-wrap: wrap; gap: 4px 20px; margin-top: 8px; }
.site-footer .beian a:hover { color: var(--fg); }
.to-top { display: inline-block; margin-top: 18px; color: var(--muted); }
.to-top:hover { color: var(--fg); }

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  :root { --gutter: 24px; }
  .grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .site-header { flex-direction: column; align-items: flex-start; padding-top: 24px; }
  .nav { gap: 6px 18px; }
  .grid { grid-template-columns: repeat(2, 1fr); gap: 20px 12px; }
  .card { background: none; overflow: visible; }
  .card .meta {
    position: static; opacity: 1; background: none; color: var(--fg);
    align-items: flex-start; text-align: left; padding: 10px 0 0;
  }
  .card .meta .y { color: var(--muted); opacity: 1; }
  .card .ph { background: var(--placeholder); }
  .project-head h1 { font-size: 24px; }
  .pager { grid-template-columns: 1fr 1fr; }
  .pager .all { display: none; }
}

/* ---------- 悬停效果：框内缓慢放大 + 底部渐变标题 ---------- */
@media (hover: hover) and (min-width: 641px) {
  .card .thumb { transition: transform 1.4s cubic-bezier(.2,.7,.2,1); will-change: transform; }
  .card:hover .thumb { transform: scale(1.1); }
  .card .meta {
    justify-content: flex-end; align-items: flex-start; text-align: left; padding: 22px 24px;
    background: linear-gradient(to top, rgba(0,0,0,.62) 0%, rgba(0,0,0,.18) 45%, rgba(0,0,0,0) 70%);
    transition: opacity .5s ease;
  }
  .card .meta .t, .card .meta .y { transform: translateY(10px); transition: transform .6s cubic-bezier(.2,.7,.2,1); }
  .card .meta .y { transition-delay: .05s; }
  .card:hover .meta .t, .card:hover .meta .y { transform: none; }
}

/* ---------- 网格排列（作品里设置 grid: 3 即启用） ---------- */
.project-media .media-grid {
  display: grid; grid-template-columns: repeat(var(--cols, 3), 1fr);
  gap: 48px; max-width: 960px; margin: 48px auto; width: 100%;
}
.project-media .media-grid img { width: 100%; background: none; }
@media (max-width: 640px) { .project-media .media-grid { gap: 12px; margin: 24px auto; } }

/* ---------- 图片说明 ---------- */
.project-media .media-fig { margin: 0; }
.project-media .media-fig img { width: 100%; }
.project-media .media-fig figcaption {
  max-width: 760px; margin: 0 auto; padding: 18px 0 0;
  font-size: 14px; line-height: 1.8; font-weight: 300; color: #444; letter-spacing: .02em;
  text-align: justify; text-justify: inter-character;
}
.project-media .media-fig figcaption p { margin: 0 0 1.25em; }
.project-media .media-fig figcaption p:last-child { margin-bottom: 0; }
.project-media .media-grid .media-fig figcaption { padding: 8px 0 0; font-size: 12px; }

/* 网格中超过 16:9 的横幅图独占一行 */
.project-media .media-grid > .wide { grid-column: 1 / -1; }
@media (max-width: 640px) { .project-media { gap: 12px; } }

.project-media .video-loop { margin: 0; background: none; }
.project-media .loop-fallback { width: 100%; }

/* 竖版视频：限制高度，居中显示 */
.project-media video.video { display: block; width: auto; max-width: 100%; max-height: 85vh; margin-left: auto; margin-right: auto; }
.project-media video.video:not(.video-loop) { background: #000; }

/* 视频永远独占一行 */
.project-media > video, .project-media > .embed { flex: 0 0 auto; }
.project-media .media-grid > video, .project-media .media-grid > .embed { grid-column: 1 / -1; }

/* 段后距与图片间距不叠加：取两者中较大的一个 */
@media (max-width: 640px) {
  .project-text { margin-bottom: 18px; }
  .project-media .media-fig figcaption { padding: 14px 0 6px; }
}

/* 手机首页两列：标题字号相应缩小 */
@media (max-width: 640px) {
  .card .meta { padding-top: 8px; }
  .card .meta .t { font-size: 14px; line-height: 1.4; letter-spacing: .03em; }
  .card .meta .y { font-size: 12px; margin-top: 2px; }
  .card .ph { font-size: 14px; padding: 10px; }
}

/* 手机首页只显示封面：去掉标题和年份，图片之间等距 */
@media (max-width: 640px) {
  .grid { gap: 10px; }
  .card .meta { display: none; }
  .card .ph { font-size: 13px; }
}

/* 白底封面：白色部分变成很淡的灰，其他颜色不受影响 */
.card.whitebg { background: #f3f2f0; isolation: isolate; }
.card.whitebg .thumb { mix-blend-mode: multiply; }

/* 手机上不做悬停放大，封面不溢出 */
@media (max-width: 640px) {
  .card { overflow: hidden; }
  .card:hover .thumb { transform: none; }
}

/* ---------- 视频说明：和图片说明同样的排版 ---------- */
.project-media .media-video { margin: 0; }
.project-media .media-video .video,
.project-media .media-video .embed { margin-bottom: 0; }