/* ===== 后台样式 ===== */
:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1f2933;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
  --border: #e5e7eb;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0, 0, 0, .05), 0 6px 20px rgba(0, 0, 0, .05);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: var(--bg); color: var(--text);
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  min-height: 100vh; line-height: 1.6;
}
.container { width: min(1100px, 94vw); margin: 0 auto; }
a { color: var(--accent); text-decoration: none; }

/* 头部 */
.admin-header {
  background: rgba(255, 255, 255, .94); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100; backdrop-filter: blur(8px);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 58px; }
.site-logo { font-size: 1.15rem; font-weight: 800; color: var(--text); }
.logo-tag {
  font-size: .7rem; background: var(--accent); color: #fff; border-radius: 6px;
  padding: 2px 7px; vertical-align: 2px; font-weight: 600;
}
.site-nav { display: flex; gap: 20px; }
.site-nav a { color: var(--muted); font-size: .93rem; font-weight: 500; }
.site-nav a:hover { color: var(--accent); text-decoration: none; }
.site-nav a.active { color: var(--accent); font-weight: 700; }

.main { padding: 26px 0 60px; }

/* 统计卡片 */
.stats-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 22px; }
.stat-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 20px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 4px;
}
.stat-num { font-size: 1.7rem; font-weight: 800; color: var(--accent); }
.stat-label { color: var(--muted); font-size: .85rem; }

/* 面板 */
.panel {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 22px 26px; margin-bottom: 22px;
}
.panel-head {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 16px; flex-wrap: wrap; gap: 10px;
}
.panel-head h2 { font-size: 1.1rem; font-weight: 700; }

/* 表格 */
.data-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.data-table th {
  text-align: left; padding: 10px 12px; color: var(--muted); font-weight: 600;
  border-bottom: 2px solid var(--border); white-space: nowrap;
}
.data-table td { padding: 11px 12px; border-bottom: 1px solid #f0f1f3; vertical-align: middle; }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: #fafbfc; }
.td-title { max-width: 320px; }
.td-title a { color: var(--text); font-weight: 600; }
.td-title a:hover { color: var(--accent); }
.td-actions { white-space: nowrap; }
.muted { color: var(--muted); }
.center { text-align: center; }

/* 按钮 */
.btn-primary {
  display: inline-block; background: var(--accent); color: #fff; border: none;
  padding: 9px 20px; border-radius: 10px; font-size: .92rem; cursor: pointer; font-weight: 600;
}
.btn-primary:hover { background: #1d4ed8; text-decoration: none; }
.btn-ghost {
  display: inline-block; background: var(--card); color: var(--text); border: 1px solid var(--border);
  padding: 9px 20px; border-radius: 10px; font-size: .92rem;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.btn-block { width: 100%; margin-top: 18px; }
.btn-mini {
  display: inline-block; background: #f3f4f6; color: var(--text); border: 1px solid var(--border);
  padding: 4px 12px; border-radius: 8px; font-size: .8rem; cursor: pointer; margin-right: 6px;
}
.btn-mini:hover { border-color: var(--accent); color: var(--accent); }
.btn-mini.danger:hover { border-color: #ef4444; color: #ef4444; background: #fef2f2; }

/* 徽章 */
.badge {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  font-size: .76rem; font-weight: 600;
}
.badge.cat { background: var(--accent-soft); color: var(--accent); }
.badge.diff { background: #fdf2f8; color: #db2777; }
.badge.contest { background: #f5f3ff; color: #7c3aed; }
.badge.ok { background: #ecfdf5; color: #059669; }
.badge.warn { background: #fef3c7; color: #b45309; }

/* 比赛多选（编辑器） */
.contest-checkbox-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px 18px;
}
.contest-check {
  display: flex; align-items: center; gap: 8px; padding: 8px 12px;
  border: 1px solid var(--border); border-radius: 10px; cursor: pointer; font-size: .9rem;
  transition: border-color .15s ease, background .15s ease;
}
.contest-check:hover { border-color: var(--accent); background: var(--accent-soft); }
.contest-check input { accent-color: var(--accent); width: 16px; height: 16px; cursor: pointer; flex-shrink: 0; }
.contest-check span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.contest-check small { flex-shrink: 0; }

/* 表单 */
.edit-form { max-width: 100%; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 20px; }
.form-item { display: flex; flex-direction: column; }
.form-item.span-2 { grid-column: span 2; }
.field-label { font-size: .88rem; font-weight: 600; margin-bottom: 6px; }
.required { color: #ef4444; }
.text-input {
  padding: 9px 14px; border: 1px solid var(--border); border-radius: 10px;
  font-size: .93rem; outline: none; background: #fff; color: var(--text); font-family: inherit;
}
.text-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(37, 99, 235, .1); }
textarea.text-input { resize: vertical; }
.publish-check { display: flex; align-items: center; gap: 7px; font-size: .92rem; cursor: pointer; }
.publish-check input { width: 17px; height: 17px; accent-color: var(--accent); cursor: pointer; }

.form-hint { color: var(--muted); font-size: .83rem; margin-top: 10px; }
.form-hint code {
  background: #f3f4f6; padding: 1px 7px; border-radius: 5px;
  font-family: Consolas, monospace; color: #c7254e;
}

.form-actions {
  display: flex; justify-content: flex-end; gap: 12px; margin-top: 4px;
}
.editor-tools { display: flex; align-items: center; gap: 10px; }
.import-status { font-size: .82rem; color: var(--muted); }
#vditor-container .vditor { border-radius: 10px; border-color: var(--border); }
#vditor-container .vditor-reset { color: var(--text); }

.settings-msg { margin-top: 14px; font-weight: 600; }
.settings-msg.ok { color: #059669; }
.settings-msg.err { color: #ef4444; }

/* 登录页 */
.login-body {
  display: flex; justify-content: center; align-items: center; min-height: 100vh;
  background: linear-gradient(135deg, #eff6ff 0%, #f5f6f8 100%);
}
.login-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 18px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .1); padding: 42px 44px; width: min(400px, 92vw);
}
.login-title { font-size: 1.35rem; font-weight: 800; text-align: center; }
.login-sub { color: var(--muted); text-align: center; font-size: .9rem; margin: 6px 0 24px; }
.login-error {
  background: #fef2f2; color: #dc2626; border: 1px solid #fecaca;
  padding: 9px 14px; border-radius: 10px; font-size: .88rem; margin-bottom: 16px;
}
.login-card .field-label { margin-top: 14px; }
.back-home { display: block; text-align: center; margin-top: 20px; font-size: .88rem; color: var(--muted); }

/* 响应式 */
@media (max-width: 720px) {
  .form-grid { grid-template-columns: 1fr; }
  .form-item.span-2 { grid-column: span 1; }
  .site-nav { gap: 12px; font-size: .85rem; }
  .data-table { display: block; overflow-x: auto; white-space: nowrap; }
}