:root {
  --bg: #f0f2f5;
  --card: #fff;
  --primary: #1890ff;
  --text: #262626;
  --muted: #8c8c8c;
  --line: #e8e8e8;
  --side: #001529;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Microsoft YaHei UI", "PingFang SC", sans-serif;
  background: var(--bg);
  color: var(--text);
}
.hidden { display: none !important; }
.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, #0b1f33, #163a5f 55%, #1d5f9b);
}
.login-card {
  width: 360px;
  background: var(--card);
  border-radius: 12px;
  padding: 28px 28px 20px;
  display: grid;
  gap: 12px;
  box-shadow: 0 16px 48px rgba(0,0,0,.25);
}
.login-card h1 { margin: 0; font-size: 22px; color: var(--primary); }
.login-card .sub { margin: -6px 0 8px; color: var(--muted); font-size: 13px; }
.login-card label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); }
.login-card input, .upload-form input, .upload-form select, .toolbar input, .top input {
  height: 36px; border: 1px solid var(--line); border-radius: 8px; padding: 0 10px; font-size: 14px;
}
.login-card button, .toolbar button, .pager button, .upload-form button, .side-foot button {
  height: 38px; border: 0; border-radius: 8px; background: var(--primary); color: #fff; cursor: pointer; font-size: 14px;
}
.err { color: #cf1322; min-height: 18px; font-size: 13px; }
.app { display: grid; grid-template-columns: 220px 1fr; min-height: 100vh; }
.side { background: var(--side); color: #fff; display: flex; flex-direction: column; padding: 16px 12px; }
.brand { font-weight: 700; padding: 8px 10px 20px; letter-spacing: .5px; }
.side nav { display: grid; gap: 6px; }
.side nav button {
  text-align: left; background: transparent; border: 0; color: #c9d4e3; padding: 10px 12px;
  border-radius: 8px; cursor: pointer; font-size: 14px;
}
.side nav button.active, .side nav button:hover { background: rgba(24,144,255,.25); color: #fff; }
.side-foot { margin-top: auto; display: grid; gap: 8px; padding: 12px 8px; font-size: 12px; color: #9ab; }
.side-foot button { background: #334; }
main { padding: 18px 22px 32px; }
.top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.top h2 { margin: 0; font-size: 18px; }
.cats { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.cats button {
  border: 0; background: #fff; border-radius: 16px; padding: 6px 14px; cursor: pointer; color: #595959;
}
.cats button.active { background: #e6f7ff; color: var(--primary); }
.cats button.offshelf { color: #cf1322; border: 1px solid #ffccc7; background: #fff1f0; }
.cats button.offshelf.active { background: #fff1f0; color: #cf1322; box-shadow: inset 0 0 0 1px #ffa39e; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 14px;
}
.card {
  background: #fff; border-radius: 10px; overflow: hidden; border: 1px solid var(--line);
  display: flex; flex-direction: column;
}
.card .thumb {
  height: 140px; background: #fafafa; display: grid; place-items: center; overflow: hidden;
}
.card .thumb img { max-width: 100%; max-height: 100%; object-fit: contain; }
.card .meta { padding: 10px; font-size: 13px; }
.card .meta .name { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card .meta .sub { color: var(--muted); margin-top: 4px; font-size: 12px; }
.card .actions { display: flex; gap: 6px; padding: 0 10px 10px; }
.card .actions button {
  flex: 1; height: 28px; border-radius: 6px; border: 1px solid var(--line); background: #fff; cursor: pointer; font-size: 12px;
}
.card .actions .danger { color: #cf1322; }
.pager { display: flex; gap: 12px; align-items: center; justify-content: center; margin-top: 18px; }
.pager button { min-width: 88px; background: #fff; color: var(--text); border: 1px solid var(--line); }
.table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 10px; overflow: hidden; }
.table th, .table td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; font-size: 13px; }
.toolbar { display: flex; gap: 8px; margin-bottom: 12px; }
.upload-form {
  max-width: 520px; background: #fff; border-radius: 12px; padding: 20px; display: grid; gap: 12px;
}
.upload-form label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); }
.upload-form .check { display: flex; align-items: center; gap: 8px; color: var(--text); }
.msg { font-size: 13px; color: #389e0d; min-height: 18px; }