:root {
  --bg: #f5f7fa;
  --card: #ffffff;
  --primary: #2f6df6;
  --primary-d: #1f4fc4;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --danger: #dc2626;
  --ok: #16a34a;
  --radius: 12px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.container { max-width: 880px; margin: 0 auto; padding: 16px; }
header.site {
  background: linear-gradient(135deg, var(--primary), var(--primary-d));
  color: #fff; padding: 18px 0; box-shadow: 0 2px 8px rgba(0,0,0,.08);
}
header.site .container { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
header.site h1 { font-size: 20px; margin: 0; }
header.site a.admin-link { color: #fff; text-decoration: none; font-size: 14px; opacity: .9; border: 1px solid rgba(255,255,255,.5); padding: 6px 12px; border-radius: 999px; }

/* 文章卡片 */
.article-list { display: grid; gap: 14px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .article-list { grid-template-columns: 1fr 1fr; } }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; cursor: pointer; transition: transform .15s, box-shadow .15s;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(0,0,0,.10); }
.card img.cover { width: 100%; height: 160px; object-fit: cover; display: block; background: #eef; }
.card .body { padding: 12px 14px; }
.card .body h3 { margin: 0 0 6px; font-size: 16px; }
.card .body .date { color: var(--muted); font-size: 12px; }
.empty { text-align: center; color: var(--muted); padding: 40px 0; }

/* 详情 */
.back-btn { background: none; border: none; color: var(--primary); cursor: pointer; font-size: 14px; padding: 0; margin-bottom: 12px; }
.article-detail img.cover { width: 100%; max-height: 360px; object-fit: cover; border-radius: var(--radius); margin-bottom: 14px; }
.article-detail h2 { margin: 0 0 6px; }
.article-detail .date { color: var(--muted); font-size: 13px; margin-bottom: 16px; }
.article-detail .content { font-size: 15px; }
.article-detail .content img { max-width: 100%; border-radius: 8px; }

/* 评价区 */
.comments { margin-top: 28px; border-top: 1px solid var(--border); padding-top: 18px; }
.comments h3 { font-size: 16px; }
.comment-item { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; margin-bottom: 10px; }
.comment-item .meta { font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.comment-item .meta b { color: var(--text); }
.comment-form { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin-top: 14px; }
.form-row { margin-bottom: 12px; }
.form-row label { display: block; font-size: 13px; margin-bottom: 4px; color: var(--muted); }
input[type=text], input[type=tel], textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; font-family: inherit;
}
textarea { resize: vertical; min-height: 84px; }
.checkbox-row { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.hint { font-size: 12px; color: var(--muted); margin-top: 6px; }
.btn { background: var(--primary); color: #fff; border: none; border-radius: 8px; padding: 10px 18px; font-size: 14px; cursor: pointer; }
.btn:hover { background: var(--primary-d); }
.btn:disabled { opacity: .6; cursor: not-allowed; }
.btn-outline { background: #fff; color: var(--primary); border: 1px solid var(--primary); }
.counter { float: right; font-size: 12px; color: var(--muted); }

/* Toast */
.toast { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%); background: #111827; color: #fff; padding: 10px 18px; border-radius: 999px; font-size: 13px; opacity: 0; transition: opacity .25s; pointer-events: none; z-index: 50; }
.toast.show { opacity: .92; }

/* 后台 */
.login-screen { max-width: 360px; margin: 80px auto; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.tabs { display: flex; gap: 8px; margin: 16px 0; flex-wrap: wrap; }
.tabs button { border: 1px solid var(--border); background: #fff; border-radius: 8px; padding: 8px 14px; cursor: pointer; font-size: 14px; }
.tabs button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.manage-list li { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--border); }
.manage-list .item-actions button { margin-left: 6px; }
.analytics-grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 720px) { .analytics-grid { grid-template-columns: 1fr 1fr; } }
.chart-box { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; }
.chart-box h4 { margin: 0 0 8px; font-size: 14px; }
.chart { width: 100%; height: 260px; }
.kpi-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.kpi { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; min-width: 120px; }
.kpi .num { font-size: 24px; font-weight: 700; color: var(--primary); }
.kpi .lbl { font-size: 12px; color: var(--muted); }