:root {
  --bg: #f2f4f9;
  --card: #ffffff;
  --primary: #2757e6;
  --primary-hover: #1e47c2;
  --primary-soft: #eaf0ff;
  --text: #1a1f36;
  --text-2: #5a6072;
  --text-3: #9aa0b0;
  --border: #e6e9f1;
  --green: #1b8a4a;
  --green-bg: #e6f6ec;
  --red: #c44545;
  --red-bg: #fdeaea;
  --orange: #d97a1f;
  --orange-bg: #fdf3e6;
  --gray-bg: #eef0f5;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px rgba(16, 24, 40, .06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ============ 布局 ============ */
.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: 224px;
  flex-shrink: 0;
  background: var(--card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 20px 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 700;
  padding: 6px 10px 18px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.brand .logo {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, #2757e6, #5b8cff);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
}

.sidebar nav { display: flex; flex-direction: column; gap: 4px; margin-top: 4px; }

.sidebar nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-2);
  text-decoration: none;
  font-weight: 500;
  transition: background .15s, color .15s;
}

.sidebar nav a:hover { background: var(--bg); color: var(--text); }

.sidebar nav a.active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 600;
}

.sidebar .logout {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-3);
  text-decoration: none;
  transition: background .15s, color .15s;
}

.sidebar .logout:hover { background: var(--red-bg); color: var(--red); }

.content { flex: 1; padding: 28px 32px; min-width: 0; }

.page-head { margin-bottom: 20px; }
.page-head h1 { margin: 0 0 4px; font-size: 22px; font-weight: 700; }
.page-head .sub { color: var(--text-2); font-size: 13px; }

/* ============ 卡片 ============ */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

/* ============ 统计卡 ============ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
}

.stat .value { font-size: 26px; font-weight: 700; letter-spacing: -.5px; }
.stat .value.primary { color: var(--primary); }
.stat .value.green { color: var(--green); }
.stat .value.red { color: var(--red); }
.stat .value.orange { color: var(--orange); }
.stat .label { color: var(--text-2); font-size: 13px; margin-top: 4px; }

/* ============ 表格 ============ */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th {
  text-align: left;
  padding: 12px 14px;
  color: var(--text-2);
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
td { padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: #fafbfe; }
td.empty { text-align: center; color: var(--text-3); padding: 32px; }

/* ============ 徽章 ============ */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}
.badge.green { background: var(--green-bg); color: var(--green); }
.badge.red { background: var(--red-bg); color: var(--red); }
.badge.orange { background: var(--orange-bg); color: var(--orange); }
.badge.gray { background: var(--gray-bg); color: var(--text-2); }
.badge.blue { background: var(--primary-soft); color: var(--primary); }

/* ============ 按钮 ============ */
button, .btn {
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .15s, opacity .15s, border-color .15s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost { background: #fff; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--bg); }
.btn-danger { background: #fff; color: var(--red); border-color: var(--border); }
.btn-danger:hover { background: var(--red-bg); border-color: var(--red); }
.btn-sm { padding: 6px 12px; font-size: 13px; }
button:disabled { opacity: .55; cursor: not-allowed; }
.link-danger { color: var(--red); text-decoration: none; cursor: pointer; font-weight: 500; }
.link-primary { color: var(--primary); text-decoration: none; cursor: pointer; font-weight: 500; }

/* ============ 表单 ============ */
input, textarea, select {
  font-family: inherit;
  font-size: 14px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  width: 100%;
  transition: border-color .15s, box-shadow .15s;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(39, 87, 230, .12);
}
label { display: block; margin-bottom: 14px; font-weight: 500; color: var(--text); }
label span, .field-label { display: block; margin-bottom: 6px; font-size: 13px; color: var(--text-2); font-weight: 500; }
textarea { resize: vertical; min-height: 100px; }
.form-hint { font-size: 12px; color: var(--text-3); margin-top: 4px; }

/* ============ 提示 ============ */
.msg { display: none; margin: 16px 0; padding: 12px 16px; border-radius: 10px; font-size: 13px; }
.msg.ok { display: block; background: var(--green-bg); color: var(--green); }
.msg.err { display: block; background: var(--red-bg); color: var(--red); }

/* ============ 登录页 ============ */
.login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #eef2ff 0%, #f2f4f9 40%, #e8f0ff 100%);
}
.login-card {
  width: 100%;
  max-width: 400px;
  background: var(--card);
  border-radius: 18px;
  box-shadow: 0 12px 40px rgba(16, 24, 40, .1);
  padding: 36px 32px;
}
.login-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.login-brand .logo {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, #2757e6, #5b8cff);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}
.login-brand .name { font-size: 18px; font-weight: 700; }
.login-brand .sub { font-size: 12px; color: var(--text-2); }
.login-error { color: var(--red); font-size: 13px; margin-bottom: 12px; display: none; }

/* ============ 响应式 ============ */
@media (max-width: 768px) {
  .layout { flex-direction: column; }
  .sidebar {
    width: 100%;
    height: auto;
    position: static;
    flex-direction: row;
    align-items: center;
    overflow-x: auto;
    padding: 10px 14px;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .brand { border-bottom: none; padding: 0 10px 0 0; margin: 0 12px 0 0; }
  .sidebar nav { flex-direction: row; gap: 2px; margin: 0; }
  .sidebar nav a { white-space: nowrap; padding: 8px 12px; }
  .sidebar .logout { margin: 0 0 0 auto; }
  .content { padding: 20px 16px; }
}