:root {
  --brand: #165dff;
  --brand-hover: #4080ff;
  --bg: #f7f8fa;
  --card: #ffffff;
  --border: #e5e6eb;
  --text-1: #1d2129;
  --text-2: #4e5969;
  --text-3: #86909c;
  --fill-1: #f7f8fa;
  --fill-2: #f2f3f5;
  --success: #00b42a;
  --danger: #f53f3f;
  --warning: #ff7d00;
  --shadow: 0 1px 2px rgba(29, 33, 41, 0.04);
}

body {
  color: var(--text-1);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}

.admin-layout {
  grid-template-columns: 220px minmax(0, 1fr);
  background: var(--bg);
}

.admin-sider {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: #fff;
  padding: 16px 12px;
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 8px 14px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.brand-mark {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
}

.brand strong { display: block; font-size: 15px; line-height: 20px; }
.brand small { display: block; margin-top: 1px; color: var(--text-3); font-size: 11px; }

.nav { display: grid; gap: 2px; }
.nav > button, .nav .nav-parent {
  width: 100%;
  height: 34px;
  border: 0;
  border-radius: 6px;
  color: var(--text-2);
  background: transparent;
  text-align: left;
  padding: 0 12px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-icon {
  display: inline-flex;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}
.nav-icon svg {
  width: 100%;
  height: 100%;
}
.nav > button:hover, .nav .nav-parent:hover { background: var(--fill-2); color: var(--text-1); }
.nav > button.active, .nav .nav-parent.active { background: #e8f3ff; color: var(--brand); font-weight: 600; }

.nav-group { margin: 0; }
.nav-group .nav-parent { position: relative; }
.nav-group .nav-parent::after {
  content: "▸";
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 10px;
  color: var(--text-3);
  transition: transform 0.2s;
}
.nav-group.open .nav-parent::after { transform: translateY(-50%) rotate(90deg); }
.nav-children {
  display: none;
  padding-left: 12px;
}
.nav-group.open .nav-children { display: grid; gap: 1px; }
.nav-children button.child {
  width: 100%;
  height: 28px;
  border: 0;
  border-radius: 6px;
  color: var(--text-3);
  background: transparent;
  text-align: left;
  padding: 0 12px;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.nav-children button.child:hover { background: var(--fill-2); color: var(--text-1); }
.nav-children button.child.active { background: #e8f3ff; color: var(--brand); font-weight: 600; }

/* Logo upload */
.logo-upload-box {
  width: 96px;
  height: 96px;
  border: 2px dashed var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.15s;
  overflow: hidden;
}
.logo-upload-box:hover { border-color: var(--brand); }
.logo-placeholder { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.logo-hint { font-size: 11px; color: var(--text-3); text-align: center; }

.admin-shell { min-width: 0; }

.admin-header {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  height: 56px;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
}
.admin-header h1 { margin: 0; font-size: 16px; font-weight: 600; }

.header-meta { display: flex; align-items: center; gap: 8px; }
.meta-pill {
  display: inline-flex;
  height: 28px;
  align-items: center;
  border-radius: 4px;
  padding: 0 10px;
  background: var(--fill-2);
  color: var(--text-2);
  font-size: 12px;
}

.main { padding: 20px 24px 40px; max-width: 1400px; }

.auth-panel { max-width: 560px; }
.auth-grid { grid-template-columns: 1fr 1fr; }

.panel {
  margin-bottom: 16px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  box-shadow: var(--shadow);
}
.panel-head { margin-bottom: 14px; }
.panel h2 { margin: 0; font-size: 15px; font-weight: 600; color: var(--text-1); }

.grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
.settings-grid { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

label { gap: 4px; color: var(--text-2); font-size: 13px; }
.site-config-form { display: grid; gap: 14px; max-width: 480px; }
.site-config-form label { display: grid; gap: 6px; }
.site-config-form input, .site-config-form select { max-width: 240px; }
.setting-key { font-weight: 500; color: var(--text-1); }
.setting-hint { color: var(--text-3); font-size: 11px; }

input, select, textarea {
  min-height: 34px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
  color: var(--text-1);
  padding: 6px 10px;
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}
input:focus, select:focus, textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 2px rgba(22,93,255,0.1); }
textarea { min-height: 72px; resize: vertical; }

.actions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; justify-content: flex-end; }
.actions.compact { margin-top: 0; }

button.primary, .actions button {
  height: 32px;
  border: 1px solid var(--brand);
  border-radius: 4px;
  background: var(--brand);
  color: #fff;
  padding: 0 14px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
}
button.primary:hover, .actions button:hover { background: var(--brand-hover); border-color: var(--brand-hover); }

button.secondary {
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
  color: var(--text-1);
  padding: 0 12px;
  font-size: 13px;
  cursor: pointer;
}
button.secondary:hover { border-color: var(--brand); color: var(--brand); }

button.sm { height: 26px; padding: 0 8px; font-size: 12px; }
.danger-text { color: var(--danger) !important; }
.danger-text:hover { border-color: var(--danger) !important; }

table {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
  font-size: 13px;
  margin-top: 12px;
}
th, td { border-bottom: 1px solid var(--border); padding: 10px 12px; color: var(--text-2); line-height: 20px; }
th { background: var(--fill-1); color: var(--text-1); font-weight: 600; font-size: 12px; }
tbody tr:hover td { background: #f7fbff; }
tbody tr:last-child td { border-bottom: 0; }

.tag {
  display: inline-flex;
  height: 22px;
  align-items: center;
  border-radius: 3px;
  padding: 0 6px;
  background: var(--fill-2);
  color: var(--text-2);
  font-size: 12px;
  white-space: nowrap;
}
.tag.success { background: #e8ffea; color: var(--success); }
.tag.danger { background: #ffece8; color: var(--danger); }
.tag.warning { background: #fff7e8; color: var(--warning); }
.tag.info { background: #e8f3ff; color: var(--brand); }

/* Stats */
.stats-grid { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; }
.stat-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 10px;
  text-align: center;
}
.stat-card.gradient-card {
  border: none;
  color: #fff;
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}
.gradient-card .stat-val { font-size: 28px; font-weight: 700; color: #fff; }
.gradient-card .stat-label { margin-top: 6px; font-size: 13px; color: rgba(255,255,255,0.85); }
.stat-val { font-size: 24px; font-weight: 700; color: var(--text-1); }
.stat-label { margin-top: 4px; font-size: 12px; color: var(--text-3); }

/* Pagination */
.pagination { display: flex; align-items: center; gap: 8px; margin-top: 12px; }
.page-info { font-size: 13px; color: var(--text-3); }

/* Tabs */
.tab-bar { display: flex; gap: 0; border-bottom: 1px solid var(--border); margin-bottom: 14px; }
.tab {
  height: 36px;
  border: 0;
  border-bottom: 2px solid transparent;
  background: none;
  color: var(--text-2);
  padding: 0 16px;
  font-size: 13px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.tab:hover { color: var(--text-1); }
.tab.active { color: var(--brand); border-bottom-color: var(--brand); font-weight: 500; }

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(2px);
}
.modal-box {
  width: min(600px, 90vw);
  max-height: 80vh;
  overflow-y: auto;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.15);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}
.modal-header h3 { margin: 0; font-size: 15px; font-weight: 600; }
.modal-close {
  width: 28px;
  height: 28px;
  border: 0;
  border-radius: 4px;
  background: transparent;
  font-size: 18px;
  color: var(--text-3);
  cursor: pointer;
}
.modal-close:hover { background: var(--fill-2); color: var(--text-1); }
.modal-body { padding: 18px; }

/* Toast */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-60px);
  padding: 10px 20px;
  border-radius: 6px;
  background: var(--text-1);
  color: #fff;
  font-size: 13px;
  opacity: 0;
  transition: transform 0.3s, opacity 0.3s;
  z-index: 200;
  pointer-events: none;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
.toast.error { background: var(--danger); }
.toast.success { background: var(--success); }

/* Charts */
.charts-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 16px; }
.chart-panel { padding: 20px; border: 1px solid var(--border); border-radius: 8px; background: var(--card); box-shadow: var(--shadow); min-width: 0; }
.chart-title { margin: 0 0 14px; font-size: 15px; font-weight: 600; color: var(--text-1); }
.chart-row { display: flex; align-items: center; gap: 32px; flex-wrap: wrap; }
.pie-svg { width: 200px; height: 200px; flex-shrink: 0; }
.chart-legend { display: grid; gap: 8px; }
.legend-item { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-2); }
.legend-item strong { color: var(--text-1); margin-left: 2px; }
.legend-dot { width: 10px; height: 10px; border-radius: 2px; flex-shrink: 0; }
.line-svg, .bar-svg { width: 100%; max-width: 600px; height: auto; }

/* Loading */
.loading { padding: 40px; text-align: center; color: var(--text-3); font-size: 14px; }

/* Detail */
.detail-grid { display: grid; gap: 8px; }
.detail-grid p { margin: 0; font-size: 13px; color: var(--text-2); }

.hint { margin: 0 0 10px; font-size: 12px; color: var(--text-3); }

/* Login Screen */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #f0f4ff 0%, #e8f3ff 50%, #f7f8fa 100%);
}

.login-card {
  width: min(420px, 90vw);
  padding: 40px 36px;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 8px 32px rgba(22, 93, 255, 0.08), 0 2px 8px rgba(0,0,0,0.04);
}

.login-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
}
.login-brand strong { display: block; font-size: 18px; color: var(--text-1); }
.login-brand small { display: block; margin-top: 2px; font-size: 12px; color: var(--text-3); }

.login-form {
  display: grid;
  gap: 16px;
}
.login-form label {
  display: grid;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
}
.login-form input {
  height: 40px;
  font-size: 14px;
  padding: 0 12px;
}

.login-submit {
  height: 42px !important;
  margin-top: 8px;
  font-size: 15px !important;
  font-weight: 600 !important;
  border-radius: 6px !important;
}

.login-footer {
  margin: 24px 0 0;
  text-align: center;
  font-size: 12px;
  color: var(--text-3);
}

@media (max-width: 768px) {
  .admin-layout { grid-template-columns: 1fr; }
  .admin-sider { position: static; height: auto; flex-direction: row; flex-wrap: wrap; gap: 4px; padding: 10px; }
  .brand { border-bottom: 0; margin-bottom: 0; padding-bottom: 0; }
  .nav { grid-template-columns: repeat(auto-fit, minmax(80px, 1fr)); width: 100%; }
  .main { padding: 14px; }
  .auth-grid { grid-template-columns: 1fr; }
}

/* Upload field group */
.field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.field-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
}

/* Chrome-compatible file input: overlay on upload box */
.logo-upload-box {
  position: relative;
  overflow: hidden;
}
.logo-file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 2;
}