:root {
  --primary: #4f6ef7;
  --primary-dark: #3a56d4;
  --danger: #e5484d;
  --success: #2e9e5b;
  --warning: #d97706;
  --text: #1f2430;
  --text-2: #5b6472;
  --text-3: #8b93a1;
  --bg: #f3f5f9;
  --card: #ffffff;
  --border: #e3e7ee;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .04);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 980px; margin: 0 auto; padding: 0 20px; }

/* ---------- 卡片 ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}
.card + .card { margin-top: 16px; }
.card-title { font-size: 16px; font-weight: 600; margin: 0 0 16px; }

/* ---------- 表单 ---------- */
label { display: block; margin-bottom: 6px; font-weight: 500; color: var(--text-2); }
.input, select.input, textarea.input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 110, 247, .12); }
.form-row { margin-bottom: 16px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.form-hint { font-size: 12px; color: var(--text-3); margin-top: 4px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
  text-decoration: none !important;
  background: var(--primary);
  color: #fff;
}
.btn:hover { background: var(--primary-dark); }
.btn-lg { padding: 12px 26px; font-size: 15px; }
.btn-block { width: 100%; }
.btn-outline { background: #fff; border-color: var(--border); color: var(--text); }
.btn-outline:hover { background: #f6f8fb; color: var(--text); }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #c93a3f; }
.btn-danger-outline { background: #fff; border-color: #f2c4c5; color: var(--danger); }
.btn-danger-outline:hover { background: #fdf1f1; }
.btn-sm { padding: 5px 12px; font-size: 13px; border-radius: 6px; }
.btn-ghost { background: transparent; color: var(--primary); border-color: transparent; }
.btn-ghost:hover { background: rgba(79, 110, 247, .08); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; }
table.table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.table th, .table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.table th { color: var(--text-2); font-weight: 600; background: #fafbfd; }
.table tr:hover td { background: #f8fafd; }
.table .url-cell { max-width: 320px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; display: inline-block; vertical-align: bottom; }
.code-cell { font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace; font-weight: 600; }

/* ---------- 徽章 ---------- */
.badge {
  display: inline-block; padding: 2px 9px; border-radius: 999px;
  font-size: 12px; font-weight: 500; line-height: 1.6;
}
.badge-green { background: #e7f6ee; color: var(--success); }
.badge-red { background: #fdecec; color: var(--danger); }
.badge-gray { background: #eef0f4; color: var(--text-2); }
.badge-blue { background: #e9eefd; color: var(--primary); }
.badge-orange { background: #fdf0e0; color: var(--warning); }

/* ---------- 提示 ---------- */
.flash { padding: 11px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 13.5px; }
.flash-success { background: #e7f6ee; color: #1d7a44; border: 1px solid #c3e8d3; }
.flash-error { background: #fdecec; color: #b02a2f; border: 1px solid #f4c6c7; }
.flash-info { background: #e9eefd; color: #3a56d4; border: 1px solid #d3dcfa; }

/* ---------- 统计卡片 ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 16px; }
.stat-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px 20px; }
.stat-card .num { font-size: 26px; font-weight: 700; color: var(--text); margin-top: 4px; }
.stat-card .lbl { font-size: 13px; color: var(--text-2); }

/* ---------- 柱状图 ---------- */
.bar-chart { display: flex; align-items: flex-end; gap: 3px; height: 160px; padding-top: 8px; }
.bar-chart .bar { flex: 1; background: var(--primary); border-radius: 3px 3px 0 0; min-height: 2px; opacity: .85; position: relative; }
.bar-chart .bar:hover { opacity: 1; }
.bar-chart .bar .tip {
  position: absolute; bottom: calc(100% + 6px); left: 50%; transform: translateX(-50%);
  background: #222; color: #fff; font-size: 11px; padding: 2px 8px; border-radius: 4px;
  white-space: nowrap; display: none; z-index: 5;
}
.bar-chart .bar:hover .tip { display: block; }
.chart-labels { display: flex; gap: 3px; margin-top: 6px; }
.chart-labels span { flex: 1; text-align: center; font-size: 10px; color: var(--text-3); }

/* ---------- 水平条形（分组统计） ---------- */
.hbar { margin-bottom: 12px; }
.hbar .row { display: flex; justify-content: space-between; font-size: 13px; margin-bottom: 3px; color: var(--text-2); }
.hbar .track { height: 8px; background: #eef0f4; border-radius: 4px; overflow: hidden; }
.hbar .fill { height: 100%; background: var(--primary); border-radius: 4px; }

/* ---------- 分页 ---------- */
.pagination { display: flex; gap: 6px; margin-top: 16px; flex-wrap: wrap; }
.pagination a, .pagination span {
  padding: 5px 12px; border: 1px solid var(--border); border-radius: 6px; color: var(--text-2); font-size: 13px; background: #fff;
}
.pagination a:hover { border-color: var(--primary); color: var(--primary); text-decoration: none; }
.pagination .current { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---------- 首页 ---------- */
.hero { text-align: center; padding: 60px 0 24px; }
.hero h1 { font-size: 30px; margin: 0 0 8px; }
.hero p { color: var(--text-2); margin: 0 0 32px; }
.create-box { max-width: 640px; margin: 0 auto; }
.create-box .big-input { padding: 15px 16px; font-size: 16px; border-radius: 10px; }
.options { margin-top: 12px; text-align: left; background: #fafbfd; border: 1px dashed var(--border); border-radius: 10px; padding: 14px 16px; display: none; }
.options.open { display: block; }
.toggle-options { font-size: 13px; color: var(--text-2); cursor: pointer; user-select: none; }
.result-box { margin-top: 20px; text-align: center; }
.result-link { font-size: 22px; font-weight: 700; color: var(--primary); word-break: break-all; }

.footer { text-align: center; color: var(--text-3); font-size: 12px; padding: 30px 0; }

/* ---------- 后台布局 ---------- */
.admin-body { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px; background: #171c28; color: #c7cdda; flex-shrink: 0;
  display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh;
}
.sidebar .brand { padding: 18px 20px; font-size: 16px; font-weight: 700; color: #fff; border-bottom: 1px solid rgba(255,255,255,.08); }
.sidebar nav { flex: 1; padding: 12px 0; }
.sidebar nav a {
  display: block; padding: 10px 20px; color: #b6bdcb; font-size: 13.5px;
  text-decoration: none; border-left: 3px solid transparent;
}
.sidebar nav a:hover { background: rgba(255,255,255,.06); color: #fff; text-decoration: none; }
.sidebar nav a.active { background: rgba(79,110,247,.18); color: #fff; border-left-color: var(--primary); }
.sidebar .side-foot { padding: 14px 20px; border-top: 1px solid rgba(255,255,255,.08); font-size: 12px; color: #7c8495; }
.admin-main { flex: 1; min-width: 0; padding: 24px; }
.admin-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; gap: 12px; flex-wrap: wrap; }
.admin-top h2 { margin: 0; font-size: 20px; }
.toolbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.toolbar .input { width: auto; min-width: 200px; }
.muted { color: var(--text-3); font-size: 12.5px; }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }
.text-center { text-align: center; }

/* ---------- 登录页 ---------- */
.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; }
.auth-card { width: 100%; max-width: 380px; }
.auth-card .brand { text-align: center; font-size: 20px; font-weight: 700; margin-bottom: 20px; }

/* ---------- 安装向导 ---------- */
.install-wrap { max-width: 980px; margin: 0 auto; padding: 44px 20px 60px; }
.install-head { text-align: center; margin-bottom: 30px; }
.install-head h1 { margin: 0 0 6px; font-size: 28px; }
.install-head p { margin: 0; color: var(--text-2); }
.install-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 20px; align-items: start; }
.install-grid .card { padding: 22px 24px; }
.install-list { margin: 0; padding: 0; list-style: none; }
.install-list li { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--border); font-size: 13.5px; }
.install-list li:last-child { border-bottom: none; }
.install-tip { text-align: center; color: var(--text-3); font-size: 12.5px; margin-top: 22px; line-height: 1.8; }

@media (max-width: 860px) {
  .install-grid { grid-template-columns: 1fr; }
}

/* ---------- 空状态 ---------- */
.empty { text-align: center; color: var(--text-3); padding: 48px 0; }
.empty .icon { font-size: 34px; margin-bottom: 8px; }

@media (max-width: 768px) {
  .sidebar { width: 60px; }
  .sidebar .brand, .sidebar nav a { padding-left: 14px; padding-right: 14px; }
  .sidebar .brand { font-size: 0; }
  .sidebar .brand::first-letter { font-size: 18px; }
  .sidebar nav a span { display: none; }
  .form-grid { grid-template-columns: 1fr; }
}