:root {
  --blue: #2563eb;
  --cyan: #0891b2;
  --gray: #64748b;
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --warn: #dc2626;
  --ok: #16a34a;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .08), 0 1px 2px rgba(15, 23, 42, .04);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  max-width: 100%;
  overflow-x: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--blue); text-decoration: none; }

/* 顶栏 */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: linear-gradient(120deg, var(--blue), var(--cyan));
  color: #fff;
}
.brand { font-weight: 700; font-size: 18px; }
.nav-toggle {
  display: none;
  background: rgba(255,255,255,.15);
  border: none;
  color: #fff;
  font-size: 22px;
  width: 44px; height: 44px;
  border-radius: 10px;
  cursor: pointer;
}

/* 导航 */
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px 16px;
  background: #fff;
  border-bottom: 1px solid var(--border);
}
.nav a {
  padding: 10px 14px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
}
.nav a:hover, .nav a:focus { background: #e0f2fe; color: var(--blue); }

/* 容器 */
.container { max-width: 920px; margin: 0 auto; padding: 16px; }

/* 卡片 */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 14px;
  box-shadow: var(--shadow);
}
.card h2, .card h3 { margin: 0 0 10px; font-size: 17px; }
.grid { display: grid; gap: 12px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* 统计块 */
.stat { text-align: center; padding: 14px; }
.stat .num { font-size: 30px; font-weight: 800; color: var(--blue); }
.stat .label { color: var(--muted); font-size: 13px; }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: var(--blue);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
}
.btn:hover { background: #1d4ed8; }
.btn.secondary { background: #fff; color: var(--blue); border-color: var(--blue); }
.btn.cyan { background: var(--cyan); }
.btn.ghost { background: var(--bg); color: var(--text); }
.btn.sm { min-height: 44px; width: auto; padding: 8px 12px; font-size: 14px; }
.btn.danger { background: var(--warn); }
.row-btns { display: flex; gap: 8px; flex-wrap: wrap; }

/* 表单 */
label { display: block; font-size: 14px; color: var(--muted); margin: 10px 0 4px; }
input, select, textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  background: #fff;
  color: var(--text);
}
textarea { min-height: 90px; resize: vertical; }

/* 标签 */
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  background: #e0f2fe;
  color: var(--blue);
  margin: 2px 4px 2px 0;
}
.tag.cyan { background: #cffafe; color: var(--cyan); }
.tag.warn { background: #fee2e2; color: var(--warn); }
.tag.gray { background: var(--bg); color: var(--muted); }

/* 列表 */
.list-item { padding: 14px 0; border-bottom: 1px solid var(--border); }
.list-item:last-child { border-bottom: none; }

/* 提醒横幅 */
.alert {
  padding: 12px 14px;
  border-radius: 10px;
  background: #fff7ed;
  border: 1px solid #fed7aa;
  color: #9a3412;
  margin-bottom: 14px;
}
.alert.ok { background: #f0fdf4; border-color: #bbf7d0; color: #166534; }

/* 表格 */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 10px 8px; border-bottom: 1px solid var(--border); text-align: left; }
th { color: var(--muted); font-weight: 600; }

/* 进度条 */
.bar { height: 8px; background: var(--bg); border-radius: 999px; overflow: hidden; }
.bar > span { display: block; height: 100%; background: var(--blue); }

/* 章节标题 */
.page-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 12px; }
.page-head h1 { font-size: 22px; margin: 0; }

.muted { color: var(--muted); font-size: 13px; }
small { color: var(--muted); }

/* 图表容器 */
.chart-box { position: relative; width: 100%; height: 360px; }

/* 移动优先：默认单列；窄屏导航折叠 */
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav { display: none; flex-direction: column; }
  .nav.open { display: flex; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .page-head { flex-direction: column; gap: 6px; }
}

/* 登录页 */
.login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #e0f2fe 0%, #f1f5f9 55%, #ecfeff 100%);
  padding: 24px 16px;
}
.login-wrap { width: 100%; max-width: 380px; }
.login-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px 24px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, .10);
}
.login-brand { text-align: center; margin-bottom: 18px; }
.login-logo {
  font-size: 40px;
  line-height: 1;
  margin-bottom: 10px;
}
.login-brand h1 {
  font-size: 21px;
  margin: 0 0 4px;
  background: linear-gradient(120deg, var(--blue), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.login-brand .muted { font-size: 13px; }
.login-foot { text-align: center; color: var(--muted); font-size: 12px; margin-top: 14px; }

/* 顶栏右侧操作区 */
.topbar-actions { display: flex; align-items: center; gap: 8px; }
.logout-link {
  color: #fff;
  font-size: 13px;
  padding: 8px 12px;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  border-radius: 10px;
  background: rgba(255,255,255,.16);
}
.logout-link:hover { background: rgba(255,255,255,.28); }

/* 打印：仅保留核心内容 */
@media print {
  .topbar, .nav, .footer, .nav-toggle, .topbar-actions, .logout-link, .no-print, .btn, form, .row-btns { display: none !important; }
  body { background: #fff; color: #000; font-size: 12px; }
  .container { max-width: 100%; padding: 0; }
  .card { box-shadow: none; border: 1px solid #ccc; break-inside: avoid; }
  .chart-box { height: 300px; }
  a { color: #000; text-decoration: underline; }
}