:root {
  --bg: #ffffff;
  --fg: #16150f;
  --muted: #8a8880;
  --line: #e8e6e0;
  --wash: #f4f3ef;
  --hover: #faf9f6;
  --accent: #16150f;
  --max: 1240px;
  --gap-x: 26px;
  --gap-y: 44px;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --serif: "Songti SC", "STSong", "SimSun", Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 40px; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: saturate(180%) blur(10px);
}

.header-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 40px 0 18px;
}

.brand { font-family: var(--serif); font-size: 23px; font-weight: 400; letter-spacing: 0.02em; }
.brand-sub { font-family: var(--serif); font-size: 13px; color: var(--muted); margin-left: 12px; }
.about-link { font-size: 13px; color: var(--fg); letter-spacing: 0.02em; }
.about-link:hover { color: var(--muted); }

/* ---------- filters ---------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 22px;
  padding-bottom: 20px;
}

.chip {
  padding: 0 0 3px;
  border-bottom: 1px solid transparent;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
  transition: color 0.15s, border-color 0.15s;
}
.chip:hover { color: var(--fg); }
.chip.on { color: var(--fg); border-bottom-color: var(--fg); }

.filter-sep { width: 1px; height: 13px; background: var(--line); margin: 0 2px; }
.count { margin-left: auto; font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }

/* ---------- grid ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--gap-y) var(--gap-x);
  padding: 34px 0 120px;
}

.card { position: relative; display: block; }

.card-media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--wash);
}

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.35s ease;
}
.card:hover .card-media img { opacity: 0.82; }

.card-meta {
  display: block;
  text-align: center;
  padding: 14px 4px 0;
}
.card-title { font-family: var(--serif); font-size: 14px; }

/* 标题排版：学号弱化 + 姓名 */
.t-id {
  font-size: 0.78em;
  letter-spacing: 0.1em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  margin-right: 8px;
}
.t-name { letter-spacing: 0.02em; }
.lb-info .t-id { color: rgba(255, 255, 255, 0.5); }
.grid .card-series { display: none; }
.card-series { font-size: 12px; color: var(--muted); }

.play-badge {
  position: absolute;
  left: 14px;
  bottom: 14px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.86);
  display: grid;
  place-items: center;
}
.play-badge::before {
  content: '';
  width: 0;
  height: 0;
  margin-left: 3px;
  border-left: 7px solid var(--fg);
  border-top: 4.5px solid transparent;
  border-bottom: 4.5px solid transparent;
}

.duration {
  position: absolute;
  right: 14px;
  bottom: 14px;
  padding: 1px 6px;
  background: rgba(255, 255, 255, 0.86);
  color: var(--fg);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

/* ---------- lightbox（作品查看保持深色） ---------- */
.lb {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  background: rgba(14, 13, 11, 0.96);
  color: #fff;
}
.lb.on { display: block; }

.lb-stage {
  position: absolute;
  inset: 56px 64px 195px;
  /* flex 居中：flex 子项的百分比 max-height 能正确参照容器确定高度，
     避免 grid 单行 auto 时 max-height:100% 失效导致图片溢出、不居中 */
  display: flex;
  align-items: center;
  justify-content: center;
}
.lb-stage img, .lb-stage video {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}

.lb-close, .lb-prev, .lb-next {
  position: absolute;
  z-index: 2;
  color: #fff;
  opacity: 0.7;
  transition: opacity 0.15s;
}
.lb-close:hover, .lb-prev:hover, .lb-next:hover { opacity: 1; }
.lb-close { top: 18px; right: 24px; font-size: 26px; line-height: 1; }
.lb-prev { left: 16px; top: 50%; transform: translateY(-50%); font-size: 30px; }
.lb-next { right: 16px; top: 50%; transform: translateY(-50%); font-size: 30px; }

.lb-bottom { position: absolute; left: 0; right: 0; bottom: 0; }
.lb-rate { padding: 0 64px 10px; }
.lb-rate .rate-box { margin: 0; padding: 12px 16px; border-color: rgba(255,255,255,.2); background: rgba(14,13,11,.78); }
.lb-rate .rate-label { color: rgba(255,255,255,.7); }
.lb-rate .rate-btn { border-color: rgba(255,255,255,.24); color: rgba(255,255,255,.8); }
.lb-rate .rate-btn:hover { border-color: #fff; color: #fff; }
.lb-rate .rate-btn.on { background: #fff; border-color: #fff; color: #111; }

.lb-info {
  padding: 16px 64px 24px;
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  background: linear-gradient(to top, rgba(14, 13, 11, 0.72), rgba(14, 13, 11, 0));
}
.lb-info .t { font-family: var(--serif); color: #fff; font-size: 16px; }
.lb-info a { border-bottom: 1px solid rgba(255,255,255,.5); margin-left: auto; }

/* ---------- detail ---------- */
.detail { padding: 26px 0 110px; }
.back { font-family: var(--serif); font-size: 13px; color: var(--muted); display: inline-block; margin-bottom: 26px; }
.back:hover { color: var(--fg); }

.detail-media { background: var(--wash); display: grid; place-items: center; }
/* 同时限制宽高并置 auto，保持原始比例，避免只限高时宽度不重算导致横向拉伸变形 */
.detail-media img, .detail-media video { max-width: 100%; max-height: 68vh; width: auto; height: auto; object-fit: contain; }

.detail-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  margin: 30px 0 10px;
}
.detail-title { font-family: var(--serif); font-size: 27px; font-weight: 400; }
.detail-id { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.detail-desc { color: #44423a; max-width: 60ch; margin: 0 0 30px; }

.meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px 24px;
  padding: 26px 0 4px;
  border-top: 1px solid var(--line);
}
.meta dt { font-size: 11px; color: var(--muted); letter-spacing: 0.06em; }
.meta dd { margin: 3px 0 0; font-size: 14px; font-variant-numeric: tabular-nums; }

.section-title { font-family: var(--serif); font-size: 14px; color: var(--fg); margin: 62px 0 22px; }

/* ---------- about ---------- */
.about-body { padding: 30px 0 120px; max-width: 60ch; }
.about-body p { margin: 0 0 16px; }

/* ---------- footer ---------- */
.site-footer {
  padding: 30px 0 40px;
  font-size: 12px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--serif);
}

.tip, .lb-tip {
  font-size: 13px;
  color: var(--muted);
  padding: 14px 0;
  margin: 0;
}
.lb-tip { color: rgba(255, 255, 255, 0.65); position: absolute; bottom: -34px; left: 0; right: 0; text-align: center; }

/* ---------- 账号区 ---------- */
.head-right { display: flex; align-items: center; gap: 22px; }
.account { display: flex; align-items: center; gap: 14px; }
.account .who { font-size: 13px; color: var(--muted); }
.account .who b { color: var(--fg); font-weight: 400; border-bottom: 1px solid var(--line); }
.btn-link { font-size: 13px; color: var(--muted); }
.btn-link:hover { color: var(--fg); }

/* ---------- 弹窗 ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: none;
  place-items: center;
  background: rgba(20, 19, 15, 0.4);
  padding: 20px;
}
.modal.on { display: grid; }
.modal-card {
  background: #fff;
  border-radius: 2px;
  padding: 30px 30px 26px;
  width: 100%;
  max-width: 372px;
}
.modal-card h2 { margin: 0 0 6px; font-family: var(--serif); font-size: 19px; font-weight: 400; }
.modal-card .sub { margin: 0 0 22px; font-size: 13px; color: var(--muted); }
.field { display: block; margin-bottom: 14px; }
.field span { display: block; font-size: 12px; color: var(--muted); margin-bottom: 6px; letter-spacing: 0.04em; }
.field input, .field textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font: inherit;
  font-size: 14px;
  background: #fff;
  color: var(--fg);
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--fg); }
.field textarea { min-height: 110px; font-family: ui-monospace, monospace; font-size: 13px; line-height: 1.7; }

.btn {
  width: 100%;
  padding: 11px;
  border-radius: 2px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  transition: opacity 0.15s;
}
.btn:hover { opacity: 0.85; }
.btn.ghost { background: none; border: 1px solid var(--line); color: var(--fg); }
.btn.ghost:hover { border-color: var(--fg); opacity: 1; }
.btn-row { display: flex; gap: 10px; margin-top: 16px; }
.err { color: #b3261e; font-size: 13px; margin: 10px 0 0; min-height: 18px; }

/* ---------- 评分 ---------- */
.rate-box {
  margin: 26px 0 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 2px;
  max-width: 520px;
}
.rate-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.rate-label { font-size: 13px; color: var(--muted); }
.rate-value { font-family: var(--serif); font-size: 22px; font-variant-numeric: tabular-nums; }
.rate-scale { display: flex; gap: 4px; flex-wrap: wrap; }
.rate-btn {
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  transition: all 0.12s;
}
.rate-btn:hover { border-color: var(--fg); color: var(--fg); }
.rate-btn.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.rate-hint { font-size: 12px; color: var(--muted); margin: 14px 0 0; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  transform: translateX(-50%);
  z-index: 300;
  padding: 11px 20px;
  border-radius: 2px;
  background: rgba(20, 19, 15, 0.92);
  color: #fff;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}
.toast.on { opacity: 1; }

/* ---------- 后台 ---------- */
.admin-grid { display: grid; grid-template-columns: 1fr; gap: 40px; padding: 26px 0 100px; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 16px; margin-bottom: 10px; }
.stat { border-top: 1px solid var(--fg); padding: 14px 0 0; }
.stat .n { font-family: var(--serif); font-size: 26px; font-variant-numeric: tabular-nums; }
.stat .l { font-size: 12px; color: var(--muted); }

.panel-title { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin: 0 0 16px; }
.panel-title h2 { margin: 0; font-family: var(--serif); font-size: 16px; font-weight: 400; }
.panel-title .act { display: flex; gap: 16px; }
.panel-title button {
  font-size: 12px;
  padding: 0 0 2px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}
.panel-title button:hover { border-bottom-color: var(--fg); color: var(--fg); }

.table-wrap { border-top: 1px solid var(--line); overflow: auto; max-height: 480px; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { padding: 10px 14px 10px 0; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { position: sticky; top: 0; background: #fff; font-weight: 400; color: var(--muted); font-size: 11px; letter-spacing: 0.06em; z-index: 1; }
td.num { font-variant-numeric: tabular-nums; }
tbody tr:hover { background: var(--hover); }
.bar { height: 4px; background: var(--fg); opacity: 0.8; min-width: 2px; }

@media (min-width: 1080px) {
  .admin-grid {
    grid-template-columns: 1.4fr 1fr;
    align-items: start;
    column-gap: 48px;
    row-gap: 40px;
  }
  /* 左列＝作品（排名 / 上传），右列＝账号（管理 / 导入）；上传与批量导入同排顶部对齐 */
  .panel-rank   { grid-area: 1 / 1 / 2 / 2; }
  .panel-users  { grid-area: 1 / 2 / 2 / 3; }
  .panel-upload { grid-area: 2 / 1 / 3 / 2; }
  .panel-import { grid-area: 2 / 2 / 3 / 3; }
}

.empty { padding: 90px 0; text-align: center; color: var(--muted); font-family: var(--serif); }

/* ---------- 上传作品面板 ---------- */
.up-drop {
  display: block;
  border: 1.5px dashed var(--line);
  border-radius: 4px;
  background: var(--wash);
  padding: 34px 22px;
  text-align: center;
  cursor: pointer;
  transition: border-color .18s ease, background .18s ease;
  margin-bottom: 18px;
}
.up-drop:hover { border-color: var(--muted); background: var(--hover); }
.up-drop.drag { border-color: var(--fg); background: var(--hover); }
.up-drop-ico {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; margin-bottom: 12px;
  border: 1px solid var(--line); border-radius: 50%;
  font-size: 22px; line-height: 1; color: var(--muted);
  transition: color .18s ease, border-color .18s ease;
}
.up-drop:hover .up-drop-ico, .up-drop.drag .up-drop-ico { color: var(--fg); border-color: var(--muted); }
.up-drop-title { display: block; font-family: var(--serif); font-size: 15px; color: var(--fg); margin-bottom: 7px; letter-spacing: .02em; }
.up-drop-hint { display: block; font-size: 12px; color: var(--muted); letter-spacing: .02em; }

.up-form { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 4px; }
.up-form .field { margin: 0; }
.up-form input { width: 100%; }

.up-preview {
  display: flex; gap: 18px; margin-top: 18px; align-items: flex-start;
  padding: 16px; background: var(--wash); border: 1px solid var(--line); border-radius: 4px;
}
.up-thumb {
  width: 220px; height: 124px; flex: 0 0 auto;
  background: #fff; border: 1px solid var(--line); border-radius: 3px;
  display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.up-thumb img, .up-thumb video { max-width: 100%; max-height: 100%; display: block; }
.up-meta { font-size: 13px; color: var(--muted); padding-top: 6px; line-height: 1.7; }
.up-meta b { color: var(--fg); font-weight: 600; }

.up-progress { display: flex; align-items: center; gap: 12px; margin: 18px 0 6px; }
.up-track { flex: 1; height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; }
.up-fill { height: 100%; width: 0%; background: var(--fg); border-radius: 99px; transition: width .15s ease; }
.up-progress.done .up-fill { background: #2f7d4f; }
.up-progress.err .up-fill { background: #b3261e; }
.up-pct { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; min-width: 40px; text-align: right; }

/* ---------- 上传作品 / 批量导入账号 同排协调 ---------- */
.panel-import .field { margin-bottom: 12px; }
.panel-import .field textarea { min-height: 152px; }

@media (max-width: 720px) {
  .up-form { grid-template-columns: 1fr; }
  .up-preview { flex-direction: column; }
}

@media (max-width: 720px) {
  .wrap { padding: 0 20px; }
  .header-top { padding: 26px 0 14px; }
  .brand { font-size: 20px; }
  .filters { gap: 16px; }
  .grid { grid-template-columns: repeat(2, 1fr); gap: 26px 12px; padding-bottom: 80px; }
  .card-title { font-size: 13px; }
  .lb-stage { inset: 48px 12px 250px; }
  .lb-rate { padding: 0 14px 8px; }
  .lb-rate .rate-scale { gap: 4px; }
  .lb-rate .rate-btn { width: 30px; height: 32px; font-size: 12px; }
  .lb-info { padding: 14px 16px 18px; flex-wrap: wrap; }
  .detail-title { font-size: 22px; }
}