:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --border: #e8eaed;
  --text: #1f2329;
  --text-light: #8a9099;
  --primary: #1677ff;
  --primary-hover: #0958d9;
  --danger: #f5222d;
  --success: #52c41a;
  --radius: 10px;
  --shadow: 0 2px 8px rgba(0,0,0,0.04);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: 220px;
  background: var(--card);
  border-right: 1px solid var(--border);
  padding: 24px 0;
  position: fixed;
  top: 0; bottom: 0; left: 0;
}

.sidebar .logo {
  font-size: 17px;
  font-weight: 600;
  padding: 0 24px 24px;
  display: flex; align-items: center; gap: 10px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}
.sidebar .logo i { color: var(--primary); }

.sidebar nav a {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 24px;
  color: var(--text-light);
  text-decoration: none;
  transition: all .15s;
  font-size: 14px;
}
.sidebar nav a:hover { background: #f2f4f7; color: var(--text); }
.sidebar nav a.active {
  background: #eaf2ff; color: var(--primary);
  border-right: 3px solid var(--primary);
  font-weight: 500;
}
.sidebar nav a i { width: 18px; text-align: center; }

.main {
  flex: 1;
  margin-left: 220px;
  padding: 24px 32px;
}

.topbar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 24px;
}
.topbar h1 { font-size: 20px; font-weight: 600; }
.topbar .user {
  display: flex; align-items: center; gap: 12px;
  color: var(--text-light); font-size: 13px;
}
.topbar .user a { color: var(--text-light); text-decoration: none; }
.topbar .user a:hover { color: var(--danger); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  margin-bottom: 20px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.stat-card .label { color: var(--text-light); font-size: 13px; margin-bottom: 8px; }
.stat-card .value { font-size: 26px; font-weight: 600; color: var(--text); }
.stat-card .icon {
  float: right; font-size: 22px; color: var(--primary); opacity: .8;
}

table {
  width: 100%; border-collapse: collapse; font-size: 13.5px;
}
table th {
  text-align: left; padding: 12px 10px;
  color: var(--text-light); font-weight: 500;
  border-bottom: 1px solid var(--border);
  background: #fafbfc;
}
table td {
  padding: 12px 10px;
  border-bottom: 1px solid var(--border);
}
table tr:last-child td { border-bottom: none; }
table tr:hover td { background: #fafbfc; }

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  text-decoration: none;
  transition: all .15s;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary {
  background: var(--primary); color: #fff; border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-hover); color: #fff; }
.btn-danger { color: var(--danger); border-color: #ffd6d6; }
.btn-danger:hover { background: #fff1f0; color: var(--danger); }
.btn-sm { padding: 4px 10px; font-size: 12.5px; }

.form-group { margin-bottom: 18px; }
.form-group label {
  display: block; margin-bottom: 6px;
  font-size: 13px; color: var(--text);
  font-weight: 500;
}
.form-group .hint { color: var(--text-light); font-size: 12px; margin-top: 4px; }
input[type=text], input[type=password], input[type=url], textarea, select {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13.5px;
  font-family: inherit;
  background: #fff;
  transition: border-color .15s;
}
input:focus, textarea:focus, select:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(22,119,255,0.08);
}
textarea { resize: vertical; min-height: 80px; }

.alert {
  padding: 10px 14px; border-radius: 8px;
  margin-bottom: 16px; font-size: 13.5px;
  display: flex; align-items: center; gap: 8px;
}
.alert-success { background: #f6ffed; color: #389e0d; border: 1px solid #b7eb8f; }
.alert-error { background: #fff1f0; color: #cf1322; border: 1px solid #ffa39e; }
.alert-info { background: #e6f4ff; color: #0958d9; border: 1px solid #91caff; }

.badge {
  display: inline-block; padding: 2px 8px;
  border-radius: 4px; font-size: 12px;
}
.badge-success { background: #f6ffed; color: #389e0d; }
.badge-danger { background: #fff1f0; color: #cf1322; }

.login-wrap {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #f7f8fa 0%, #eaf2ff 100%);
}
.login-card {
  width: 380px; padding: 40px;
  background: #fff; border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.06);
}
.login-card h1 {
  font-size: 20px; text-align: center;
  margin-bottom: 32px; font-weight: 600;
}
.login-card h1 i { color: var(--primary); margin-right: 8px; }
.login-card .btn-primary {
  width: 100%; justify-content: center; padding: 11px;
  font-size: 14px;
}

.pagination {
  display: flex; gap: 6px; justify-content: center;
  margin-top: 20px;
}
.pagination a, .pagination span {
  padding: 5px 11px; border-radius: 6px;
  border: 1px solid var(--border);
  text-decoration: none; color: var(--text);
  font-size: 13px;
}
.pagination .current { background: var(--primary); color: #fff; border-color: var(--primary); }

.code-block {
  background: #f7f8fa; border: 1px solid var(--border);
  border-radius: 8px; padding: 12px 14px;
  font-family: "SF Mono", Monaco, monospace;
  font-size: 12.5px; color: #333;
  word-break: break-all;
}

.empty {
  text-align: center; padding: 60px 20px; color: var(--text-light);
}
.empty i { font-size: 40px; opacity: .3; margin-bottom: 12px; display: block; }