/* ============================================================
   Thread Art · Admin 设计系统
   后台：侧边栏布局 + 表格 / 表单 / 通知 / 徽标 / 按钮
   ============================================================ */

/* ---------- 1. Tokens ---------- */
:root {
  --brand-50: #eef4ff;
  --brand-100: #dbe7ff;
  --brand-500: #2f6fed;
  --brand-600: #2458cc;
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-muted: #fafbfc;
  --border: #e4e7ec;
  --border-strong: #d0d5dc;
  --text: #1f2329;
  --text-muted: #6b7280;
  --text-faint: #9aa1ac;
  --ok: #2e9e5b;   --ok-bg: #e9f7ef;   --ok-border: #bfe3cd;
  --danger: #d64545; --danger-bg: #fdecec; --danger-border: #f5c7c7;
  --warning: #b45309; --warning-bg: #fdf4e4; --warning-border: #efd9b4;
  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px;
  --space-5: 20px; --space-6: 24px;
  --radius-sm: 6px; --radius-md: 8px; --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow-md: 0 4px 14px rgba(16, 24, 40, 0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sidebar-w: 232px;
}

/* ---------- 2. 基础 ---------- */
* { box-sizing: border-box; }
body {
  margin: 0; font-family: var(--font-sans); font-size: 14px; line-height: 1.6;
  color: var(--text); background: var(--bg); -webkit-font-smoothing: antialiased;
}
a { color: var(--brand-500); text-decoration: none; }
a:hover { text-decoration: underline; }
code, .mono {
  font-family: var(--font-mono); font-size: 0.9em;
  background: var(--surface-muted); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 1px 6px;
}
:focus-visible { outline: 2px solid var(--brand-500); outline-offset: 2px; }

/* ---------- 3. 布局壳 ---------- */
.admin-shell { display: flex; min-height: 100vh; }

/* 侧边栏 */
.admin-sidebar {
  width: var(--sidebar-w); flex: 0 0 var(--sidebar-w);
  background: var(--surface); border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh;
}
.admin-brand { padding: 22px 20px 16px; border-bottom: 1px solid var(--border); }
.admin-brand-eyebrow {
  margin: 0 0 4px; font-size: 11px; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--brand-500);
}
.admin-brand h1 { margin: 0; font-size: 16px; font-weight: 600; }
.admin-brand-copy { margin: 4px 0 0; font-size: 12px; color: var(--text-muted); }
.admin-nav { display: flex; flex-direction: column; gap: 2px; padding: 14px 12px; }
.admin-nav-link {
  display: block; padding: 9px 12px; border-radius: var(--radius-md);
  color: var(--text-muted); font-size: 13px; font-weight: 500;
}
.admin-nav-link:hover { background: var(--surface-muted); color: var(--text); text-decoration: none; }
.admin-nav-link.is-active { background: var(--brand-50); color: var(--brand-600); }
.admin-sidebar-footer { margin-top: auto; padding: 16px 20px; border-top: 1px solid var(--border); }
.admin-home-link { display: inline-block; margin-bottom: 14px; font-size: 13px; }
.admin-session-label { margin: 0; font-size: 11px; color: var(--text-faint); }
.admin-session-user { margin: 0 0 10px; font-size: 13px; font-weight: 600; }

/* 主区 */
.admin-main { flex: 1 1 auto; padding: 26px 32px 56px; min-width: 0; }
.admin-header { margin-bottom: 22px; }
.admin-header-kicker { margin: 0 0 4px; font-size: 12px; color: var(--brand-500); font-weight: 600; }
.admin-header h2 { margin: 0 0 4px; font-size: 20px; font-weight: 600; }
.admin-header-copy { margin: 0; font-size: 13px; color: var(--text-muted); }

/* ---------- 4. 组件 ---------- */

/* 按钮 */
.button {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 16px; border: 1px solid transparent; border-radius: var(--radius-md);
  font-size: 13px; font-weight: 500; line-height: 1.4; cursor: pointer;
  background: var(--surface); color: var(--text);
  transition: background 0.15s, border-color 0.15s, opacity 0.15s;
  white-space: nowrap;
}
.button:disabled { opacity: 0.55; cursor: not-allowed; }
.button-primary { background: var(--brand-500); color: #fff; }
.button-primary:hover:not(:disabled) { background: var(--brand-600); }
.button-primary:disabled { background: var(--brand-500); }
.button-secondary { border-color: var(--border-strong); background: var(--surface); }
.button-secondary:hover:not(:disabled) { border-color: var(--brand-500); color: var(--brand-600); }
.button-danger { background: var(--danger-bg); color: var(--danger); border-color: var(--danger-border); }
.button-danger:hover:not(:disabled) { background: #fbdada; }
.button-sm { padding: 5px 12px; font-size: 12px; }
.button-block { width: 100%; }
.button-row { display: flex; gap: 8px; flex-wrap: wrap; }

/* 通知（flash） */
.notice-stack { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.notice {
  padding: 10px 14px; border-radius: var(--radius-md);
  border: 1px solid var(--border); font-size: 13px;
  background: var(--surface);
}
.notice-success { background: var(--ok-bg); color: var(--ok); border-color: var(--ok-border); }
.notice-error { background: var(--danger-bg); color: var(--danger); border-color: var(--danger-border); }
.notice-info { background: var(--brand-50); color: var(--brand-600); border-color: var(--brand-100); }

/* 卡片 */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 22px 24px;
  box-shadow: var(--shadow-sm); margin-bottom: 20px;
}
.card h2, .card h3 { margin: 0 0 14px; font-size: 15px; font-weight: 600; }
.card-title { margin: 0 0 16px; font-size: 15px; font-weight: 600; }

/* 表单 */
.admin-form .field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.field .field-hint { font-size: 12px; color: var(--text-faint); margin-top: 4px; }
.text-input, .admin-form input[type="text"],
.admin-form input[type="password"], .admin-form input[type="file"],
.admin-form select {
  width: 100%; height: 40px; padding: 0 12px;
  border: 1px solid var(--border-strong); border-radius: var(--radius-md);
  background: var(--surface); font: inherit; color: var(--text); outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.admin-form input[type="file"] { padding-top: 8px; }
.text-input:focus, .admin-form input:focus, .admin-form select:focus {
  border-color: var(--brand-500); box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.18);
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; }
.form-actions { display: flex; gap: 10px; margin-top: 6px; }

/* 表格 */
.table-wrap { overflow-x: auto; }
.admin-table {
  width: 100%; border-collapse: separate; border-spacing: 0;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
  font-size: 13px;
}
.admin-table th {
  text-align: left; padding: 10px 14px; font-size: 12px; font-weight: 600;
  color: var(--text-muted); background: var(--surface-muted);
  border-bottom: 1px solid var(--border); white-space: nowrap;
}
.admin-table td { padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
.admin-table tbody tr:last-child td { border-bottom: 0; }
.admin-table tbody tr:hover { background: var(--surface-muted); }
.admin-table .row-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.admin-table .row-actions form { margin: 0; }
.admin-table .empty-row td { text-align: center; color: var(--text-faint); padding: 28px 14px; }

/* 工具条（筛选/操作） */
.toolbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.toolbar .text-input, .toolbar select { width: auto; height: 36px; }
.toolbar .spacer { flex: 1 1 auto; }

/* 列表页：筛选栏与元信息 */
.filter-result-meta { margin: 0 0 14px; font-size: 12px; color: var(--text-muted); }
.filter-result-meta strong { color: var(--text); font-variant-numeric: tabular-nums; }
.filter-bar { display: flex; flex-direction: column; gap: 10px; margin-bottom: 16px; }
.filter-bar-main { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.filter-search { width: 280px; max-width: 100%; height: 36px; padding: 0 12px;
  border: 1px solid var(--border-strong); border-radius: var(--radius-md);
  background: var(--surface); font: inherit; color: var(--text); outline: none; }
.filter-search:focus { border-color: var(--brand-500); box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.18); }
.filter-bar select { height: 36px; padding: 0 30px 0 12px; border: 1px solid var(--border-strong);
  border-radius: var(--radius-md); background: var(--surface); font: inherit; color: var(--text); outline: none; }
.filter-bar select:focus { border-color: var(--brand-500); }
.filter-actions { display: flex; gap: 8px; }
.filter-bar-custom { display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 10px 12px; background: var(--surface-muted);
  border: 1px dashed var(--border-strong); border-radius: var(--radius-md); }
.filter-bar-custom[hidden] { display: none; }
.filter-label { font-size: 12px; font-weight: 600; color: var(--text-muted); }
.date-range { display: flex; align-items: center; gap: 8px; }
.date-range input[type="date"] { height: 34px; padding: 0 8px; border: 1px solid var(--border-strong);
  border-radius: var(--radius-md); background: var(--surface); font: inherit; color: var(--text); outline: none; }
.date-sep { color: var(--text-faint); font-size: 13px; }

/* 表格内堆叠与状态 */
.meta-stack { display: flex; flex-direction: column; gap: 3px; min-width: 150px; }
.meta-stack .mono { background: transparent; border: 0; padding: 0; font-weight: 600; }
.muted { color: var(--text-muted); font-size: 12px; }
.text-danger { color: var(--danger); font-size: 12px; }
.time-stack { display: flex; flex-direction: column; gap: 3px; font-size: 12px; white-space: nowrap; }
.time-label { color: var(--text-faint); margin-right: 4px; }
.action-row { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.action-row form { margin: 0; }
.inline-form { display: inline; }

/* 空态 */
.empty-card { padding: 34px 20px; text-align: center; color: var(--text-faint); font-size: 13px;
  background: var(--surface); border: 1px dashed var(--border-strong); border-radius: var(--radius-lg); }

/* 预览 modal */
.preview-modal[hidden] { display: none; }
.preview-modal { position: fixed; inset: 0; z-index: 100; display: flex;
  align-items: center; justify-content: center; padding: 24px; }
.preview-modal-backdrop { position: absolute; inset: 0; background: rgba(16, 24, 40, 0.55); }
.preview-modal-dialog { position: relative; display: flex; flex-direction: column; overflow: hidden;
  background: var(--surface); border-radius: var(--radius-lg); box-shadow: var(--shadow-md);
  max-width: min(92vw, 880px); max-height: 90vh; }
.preview-modal-header { display: flex; align-items: center; justify-content: space-between;
  padding: 12px 18px; border-bottom: 1px solid var(--border); }
.preview-modal-header h3 { margin: 0; font-size: 15px; font-weight: 600; }
.preview-modal-body { padding: 16px; overflow: auto; background: var(--surface-muted); }
.preview-modal-body img { display: block; max-width: 100%; height: auto; margin: 0 auto;
  border-radius: var(--radius-md); }
body.preview-modal-open { overflow: hidden; }

/* 徽标 */
.badge {
  display: inline-block; padding: 2px 9px; border-radius: 999px;
  font-size: 11px; font-weight: 600; line-height: 1.5; white-space: nowrap;
}
.badge-ok { background: var(--ok-bg); color: var(--ok); }
.badge-warn { background: var(--warning-bg); color: var(--warning); }
.badge-error { background: var(--danger-bg); color: var(--danger); }
.badge-info { background: var(--brand-50); color: var(--brand-600); }
.badge-neutral { background: var(--surface-muted); color: var(--text-muted); border: 1px solid var(--border); }

/* 详情网格 */
.detail-list {
  margin: 0; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden;
}
.detail-pair { display: grid; grid-template-columns: 160px 1fr; }
.detail-pair + .detail-pair { border-top: 1px solid var(--border); }
.detail-pair dt, .detail-pair dd {
  margin: 0; padding: 9px 14px; font-size: 13px;
}
.detail-pair dt { color: var(--text-muted); background: var(--surface-muted); font-size: 12px; }
.detail-pair dd { font-variant-numeric: tabular-nums; word-break: break-all; }

/* 预览图 */
.preview-img {
  max-width: 100%; border: 1px solid var(--border); border-radius: var(--radius-md);
  background: #fff; display: block;
}
.preview-empty { color: var(--text-faint); font-size: 13px; }

/* 字体卡片网格 */
.font-admin-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.font-admin-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 16px 18px;
  display: flex; flex-direction: column; gap: 8px;
}
.font-admin-card-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.font-admin-card-name { font-size: 14px; font-weight: 600; }
.font-admin-card-meta { font-size: 12px; color: var(--text-muted); line-height: 1.7; }
.font-admin-card-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 4px; }
.font-admin-card-actions form { margin: 0; }

/* 分页 */
.pagination { display: flex; align-items: center; gap: 12px; margin-top: 14px; font-size: 13px; color: var(--text-muted); }
.pagination .button { min-width: 40px; }

/* 登录页（无侧边栏） */
.login-shell {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
.login-card {
  width: 380px; max-width: 100%;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-xl, 16px); padding: 30px 28px;
  box-shadow: var(--shadow-md);
}
.login-card .admin-brand-eyebrow { margin-bottom: 6px; }
.login-card h1 { margin: 0 0 4px; font-size: 19px; font-weight: 600; }
.login-card .intro { margin: 0 0 22px; font-size: 13px; color: var(--text-muted); }

/* ---------- 5. 响应式 ---------- */
@media (max-width: 860px) {
  .admin-shell { flex-direction: column; }
  .admin-sidebar {
    width: 100%; flex: none; height: auto; position: static;
    flex-direction: row; align-items: center; gap: 12px;
    padding: 12px 16px;
  }
  .admin-brand { border-bottom: 0; padding: 0; }
  .admin-brand-copy { display: none; }
  .admin-nav { flex-direction: row; padding: 0; margin-left: auto; }
  .admin-sidebar-footer { display: none; }
  .admin-main { padding: 18px 16px 40px; }
  .form-grid { grid-template-columns: 1fr; }
}