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

:root {
  --bg: #f5f5f0;
  --card-bg: #ffffff;
  --text: #1a1a1a;
  --text-secondary: #666666;
  --accent: #c0392b;
  --accent-dark: #96281b;
  --border: #e0e0dc;
  --success: #27ae60;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

#login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.login-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 48px 40px;
  width: 100%;
  max-width: 400px;
}

.login-card h1 {
  font-size: 1.6rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 32px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
}

.error-msg {
  color: var(--accent);
  font-size: 0.85rem;
  margin-bottom: 16px;
}

.btn-primary {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: var(--accent-dark);
}

#dashboard {
  min-height: 100vh;
}

.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 32px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
}

.dashboard-header h1 {
  font-size: 1.3rem;
  font-weight: 600;
}

.btn-logout {
  padding: 8px 16px;
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.2s;
}

.btn-logout:hover {
  background: var(--accent);
  color: #fff;
}

/* ===== 仪表板内容 ===== */

#dashboard-content {
  padding: 24px 32px;
  max-width: 1200px;
  margin: 0 auto;
}

.overview-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 16px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}

.card-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
}

.card-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.section-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 28px;
}

.chart-box {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

.chart-box h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.data-table th {
  text-align: left;
  padding: 8px 10px;
  background: #f9f9f7;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}

.data-table tr:last-child td {
  border-bottom: none;
}

.table-wrapper {
  overflow-x: auto;
}

/* 响应式 */
@media (max-width: 768px) {
  .section-grid {
    grid-template-columns: 1fr;
  }
  .dashboard-header {
    padding: 16px 20px;
  }
  #dashboard-content {
    padding: 16px;
  }
}

/* ===== 加载与空状态 ===== */

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(245, 245, 240, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.loading {
  text-align: center;
  color: var(--text-secondary);
}

.loading p {
  font-size: 1.1rem;
  margin-top: 16px;
}

.loading::before {
  content: '';
  display: block;
  width: 36px;
  height: 36px;
  margin: 0 auto;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.empty-state {
  text-align: center;
  padding: 80px 20px;
}

.empty-state p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 8px;
}

.empty-state .hint {
  font-size: 0.85rem;
  color: #999;
}