:root {
  --bg: #f4f6f9;
  --panel: #ffffff;
  --line: #e3e8ef;
  --text: #1f2733;
  --muted: #7a869a;
  --primary: #2f6df6;
  --primary-d: #1f54c9;
  --danger: #e2483a;
  --ok: #1f9d55;
  --shadow: 0 2px 10px rgba(20,30,50,.08);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text);
  font-size: 15px; line-height: 1.5;
}
.muted { color: var(--muted); }
.err { color: var(--danger); min-height: 1.2em; font-size: 13px; }
.spacer { flex: 1; }

/* ---------- 登录 ---------- */
.login-view {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 16px;
}
.login-card {
  width: 100%; max-width: 340px; background: var(--panel); border-radius: 14px;
  padding: 28px 22px; box-shadow: var(--shadow); text-align: center;
}
.login-card h1 { font-size: 20px; margin: 0 0 4px; }
.login-card .muted { margin: 0 0 18px; }
.login-card input {
  width: 100%; padding: 12px 14px; margin-bottom: 12px; border: 1px solid var(--line);
  border-radius: 10px; font-size: 15px;
}

/* ---------- 按钮 ---------- */
.btn {
  border: 1px solid var(--line); background: #fff; color: var(--text);
  padding: 10px 16px; border-radius: 10px; font-size: 14px; cursor: pointer;
}
.btn:hover { background: #f0f3f8; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; width: 100%; }
.btn.primary:hover { background: var(--primary-d); }
.btn.small { padding: 6px 12px; font-size: 13px; }
.btn.danger { color: var(--danger); border-color: #f3c4bf; }
.btn.ok { color: var(--ok); border-color: #bfe6cd; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ---------- 布局 ---------- */
#app-view { display: flex; min-height: 100vh; }
#app-view[hidden] { display: none; }
#login-view[hidden] { display: none; }
#sidebar {
  width: 210px; background: var(--panel); border-right: 1px solid var(--line);
  display: flex; flex-direction: column; position: fixed; top: 0; bottom: 0; left: 0;
}
.brand { padding: 18px 16px; font-weight: 700; font-size: 17px; border-bottom: 1px solid var(--line); }
#nav { padding: 10px; display: flex; flex-direction: column; gap: 4px; overflow-y: auto; }
#nav button {
  text-align: left; padding: 11px 14px; border: none; background: transparent;
  border-radius: 9px; cursor: pointer; font-size: 14px; color: var(--text);
}
#nav button:hover { background: #eef2f8; }
#nav button.active { background: var(--primary); color: #fff; }

#main { flex: 1; margin-left: 210px; display: flex; flex-direction: column; min-width: 0; }
#topbar {
  display: flex; align-items: center; gap: 10px; padding: 12px 18px;
  background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5;
}
#page-title { font-weight: 600; font-size: 16px; }
.icon-btn { border: none; background: transparent; font-size: 20px; cursor: pointer; display: none; }

#content { padding: 18px; padding-bottom: 90px; }

/* ---------- 卡片 / 区块 ---------- */
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px; margin-bottom: 16px; box-shadow: var(--shadow);
}
.card h2 { margin: 0 0 14px; font-size: 16px; }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; }
.field { display: flex; flex-direction: column; gap: 4px; }
.field label { font-size: 12px; color: var(--muted); }
input, select, textarea {
  padding: 9px 11px; border: 1px solid var(--line); border-radius: 9px; font-size: 14px;
  font-family: inherit; background: #fff; color: var(--text);
}
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; background: #fafbfd; position: sticky; top: 0; }
tbody tr:hover { background: #f7f9fc; }
.num { text-align: right; font-variant-numeric: tabular-nums; }
.in { color: var(--ok); }
.out { color: var(--danger); }

/* ---------- 图表 ---------- */
.charts { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.chart-box { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px; box-shadow: var(--shadow); }
.chart-box h3 { margin: 0 0 10px; font-size: 15px; }
.chart-box canvas { max-height: 280px; }

/* ---------- 统计数字 ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; }
.stat {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px;
  box-shadow: var(--shadow);
}
.stat .v { font-size: 24px; font-weight: 700; }
.stat .l { color: var(--muted); font-size: 13px; }

/* ---------- 底部导航（手机端）---------- */
#bottom-nav {
  display: none; position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--panel); border-top: 1px solid var(--line);
  padding: 6px 8px calc(6px + env(safe-area-inset-bottom)); gap: 4px;
  overflow-x: auto; white-space: nowrap; z-index: 10;
}
#bottom-nav button {
  flex: 0 0 auto; border: none; background: transparent; padding: 8px 12px;
  border-radius: 9px; font-size: 13px; color: var(--text); cursor: pointer;
}
#bottom-nav button.active { background: var(--primary); color: #fff; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 80px; transform: translateX(-50%);
  background: #1f2733; color: #fff; padding: 10px 18px; border-radius: 20px;
  font-size: 14px; z-index: 50; box-shadow: var(--shadow);
}

/* ---------- 手机端响应式 ---------- */
@media (max-width: 768px) {
  #sidebar { transform: translateX(-100%); transition: transform .2s; z-index: 20; }
  #sidebar.open { transform: translateX(0); box-shadow: 0 0 30px rgba(0,0,0,.2); }
  #main { margin-left: 0; }
  .icon-btn { display: inline-block; }
  #content { padding: 14px; padding-bottom: 84px; }
  .charts { grid-template-columns: 1fr; }
  #bottom-nav { display: flex; }
  #nav button { font-size: 15px; padding: 13px 14px; }
}