:root {
  --bg: #f4f6fa;
  --card: #ffffff;
  --border: #e3e8f0;
  --text: #1f2733;
  --muted: #7a8699;
  --primary: #3b6ef6;
  --primary-dark: #2d55c4;
  --danger: #e5484d;
  --ok: #2f9e6e;
  --radius: 12px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
/* 保证 hidden 属性始终生效，不被 display:flex/grid 等规则覆盖 */
[hidden] { display: none !important; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text); min-height: 100vh;
}

/* ---------- 登录 ---------- */
.auth-wrap { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.auth-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  padding: 36px 32px; width: 380px; box-shadow: 0 8px 30px rgba(30,50,90,.08);
}
.brand { font-size: 22px; margin-bottom: 4px; }
.sub { color: var(--muted); font-size: 13px; margin-bottom: 20px; }
.tabs { display: flex; gap: 6px; margin-bottom: 16px; background: var(--bg); border-radius: 8px; padding: 4px; }
.tabs.small { display: inline-flex; margin: 10px 0 14px; }
.tab {
  flex: 1; border: 0; background: transparent; padding: 8px 14px; border-radius: 6px;
  cursor: pointer; color: var(--muted); font-size: 14px;
}
.tabs.small .tab { flex: none; }
.tab.active { background: var(--card); color: var(--text); font-weight: 600; box-shadow: 0 1px 4px rgba(0,0,0,.08); }
input, textarea, select {
  width: 100%; border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px;
  font-size: 14px; margin: 6px 0 12px; background: #fff; color: var(--text); font-family: inherit;
}
input:focus, textarea:focus { outline: 2px solid rgba(59,110,246,.25); border-color: var(--primary); }
label { font-size: 13px; color: var(--muted); display: block; }
.btn {
  border: 0; border-radius: 8px; padding: 10px 16px; font-size: 14px; cursor: pointer;
  background: #eceff5; color: var(--text); transition: .15s;
}
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.danger { background: var(--danger); color: #fff; }
.btn.ghost { background: transparent; border: 1px solid var(--border); }
.btn.sm { padding: 5px 10px; font-size: 12px; border-radius: 6px; }
.btn.block { width: 100%; margin-top: 6px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.hint { text-align: center; color: var(--muted); font-size: 12px; margin-top: 14px; }
.msg { text-align: center; font-size: 13px; min-height: 18px; margin-top: 10px; color: var(--danger); }

/* ---------- 顶栏与布局 ---------- */
.topbar { background: var(--card); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 10; }
.topbar-inner {
  max-width: 1100px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand-sm { font-weight: 700; font-size: 16px; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.whoami { font-size: 13px; color: var(--muted); }
.whoami b { color: var(--text); }
.role-badge { font-size: 11px; padding: 2px 8px; border-radius: 10px; background: #eef2ff; color: var(--primary); margin-left: 6px; }
.container { max-width: 1100px; margin: 0 auto; padding: 20px; }
.panel {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; margin-bottom: 20px;
}
.panel h2 { font-size: 16px; margin-bottom: 12px; }
.upload-form { max-width: 640px; }
.form-grid { display: grid; grid-template-columns: 1fr 160px; gap: 14px; }
.form-grid.four { grid-template-columns: 1fr 1fr 140px auto; align-items: end; }
.create-user-form { margin-bottom: 16px; }
.file-label { display: block; }
.file-preview { max-width: 220px; max-height: 160px; border-radius: 8px; border: 1px solid var(--border); margin-top: 6px; }
.img-limit-row { max-width: 160px; margin-bottom: 10px; }
.dropzone {
  max-width: 640px; border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 36px 20px; text-align: center; cursor: pointer; transition: .15s; background: #fafbfe;
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--primary); background: #eef3ff;
}
.dz-main { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.dz-sub { font-size: 12px; color: var(--muted); }

/* ---------- 瀑布流资源列表 ---------- */
.list-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 14px; }
.muted { color: var(--muted); font-size: 13px; }
.grid { columns: 240px; column-gap: 16px; }
.card {
  break-inside: avoid; -webkit-break-inside: avoid;
  margin: 0 0 16px;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; transition: .15s;
}
.card:hover { box-shadow: 0 6px 18px rgba(30,50,90,.10); }
.card-thumb {
  background: #f0f3f9;
  display: flex; align-items: center; justify-content: center; color: var(--muted); font-size: 30px;
}
.card-thumb.clickable { cursor: zoom-in; }
.card-thumb.text-thumb { height: 110px; }
.card-img { width: 100%; height: auto; display: block; }

/* ---------- 图片预览弹层 ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(15, 20, 30, .82);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px;
}
.lightbox img {
  max-width: 88vw; max-height: 82vh; border-radius: 10px;
  box-shadow: 0 12px 48px rgba(0,0,0,.5);
}
.lb-title { color: #e8ecf4; font-size: 14px; }
.lb-close {
  position: absolute; top: 18px; right: 26px;
  background: transparent; border: 0; color: #fff; font-size: 42px; line-height: 1;
  cursor: pointer; opacity: .8;
}
.lb-close:hover { opacity: 1; }

/* ---------- 通用弹窗 ---------- */
.modal {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(15, 20, 30, .55);
  display: flex; align-items: center; justify-content: center; padding: 16px;
}
.modal-card {
  background: #fff; border-radius: 14px; padding: 24px 24px 18px;
  width: 360px; max-width: 100%; box-shadow: 0 12px 40px rgba(0,0,0,.3);
}
.modal-card h3 { font-size: 16px; margin-bottom: 12px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 8px; }
@media (max-width: 640px) {
  .modal-card { padding: 20px 16px 14px; }
}
.card-body { padding: 14px 16px; flex: 1; display: flex; flex-direction: column; gap: 6px; }
.card-title { font-weight: 600; font-size: 15px; }
.card-desc { color: var(--muted); font-size: 13px; line-height: 1.5; max-height: 40px; overflow: hidden; }
.card-meta { font-size: 12px; color: var(--muted); display: flex; gap: 10px; flex-wrap: wrap; }
.tag { font-size: 11px; padding: 2px 8px; border-radius: 10px; background: var(--bg); }
.tag.ok { background: #e7f6ef; color: var(--ok); }
.tag.warn { background: #fdf0e7; color: #c96a1f; }
.tag.grey { background: #eceff5; color: var(--muted); }
.card-actions { display: flex; gap: 8px; padding: 0 16px 16px; }
.card-actions .btn { flex: 1; }
.text-preview {
  background: var(--bg); border-radius: 8px; padding: 10px; font-size: 12px;
  color: var(--muted); max-height: 64px; overflow: hidden; white-space: pre-wrap; line-height: 1.6;
}

/* ---------- 表格 ---------- */
.table { width: 100%; border-collapse: collapse; font-size: 13px; }
.table th, .table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.table th { color: var(--muted); font-weight: 500; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%);
  background: #2a3140; color: #fff; padding: 10px 22px; border-radius: 10px; font-size: 14px;
  box-shadow: 0 6px 20px rgba(0,0,0,.25); z-index: 99;
}
.toast.err { background: var(--danger); }

/* ---------- 手机端适配 ---------- */
@media (max-width: 640px) {
  .auth-card { width: 100%; padding: 26px 20px; }
  .topbar-inner { padding: 10px 12px; }
  .whoami { font-size: 12px; }
  .container { padding: 12px; }
  .panel { padding: 14px 14px 16px; border-radius: 10px; }
  .grid { columns: 2; column-gap: 10px; }
  .card { margin-bottom: 10px; border-radius: 10px; }
  .card-body { padding: 10px 12px; gap: 4px; }
  .card-title { font-size: 13px; }
  .card-desc { font-size: 12px; }
  .card-meta { font-size: 11px; gap: 6px; }
  .tag { font-size: 10px; padding: 1px 6px; }
  .card-actions { padding: 0 12px 12px; gap: 6px; }
  .card-actions .btn { padding: 7px 6px; font-size: 12px; }
  .text-preview { font-size: 11px; max-height: 48px; }
  .dropzone { padding: 24px 12px; }
  .dz-main { font-size: 13px; }
  .form-grid, .form-grid.four { grid-template-columns: 1fr; gap: 0; }
  .table { font-size: 12px; }
  .table th, .table td { padding: 6px 6px; }
  .lightbox img { max-width: 94vw; max-height: 76vh; }
}