/* ========== 全局样式变量 ========== */
:root {
  --primary: #1890ff;
  --success: #52c41a;
  --warning: #faad14;
  --error: #f5222d;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f5f5f5;
  --bg-card: #fff;
  --border-color: #e8e8e8;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* ========== 重置样式 ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-secondary);
}

a {
  text-decoration: none;
  color: var(--primary);
}

button {
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
  font-family: inherit;
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ========== 通用工具类 ========== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }

/* ========== 按钮样式 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  font-size: 14px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
  border: none;
  outline: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: #40a9ff;
}

.btn-secondary {
  background: #fff;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-success {
  background: var(--success);
  color: #fff;
}

.btn-success:hover {
  background: #73d13d;
}

.btn-danger {
  background: var(--error);
  color: #fff;
}

.btn-danger:hover {
  background: #ff4d4f;
}

.btn-large {
  padding: 12px 24px;
  font-size: 16px;
}

.btn-small {
  padding: 4px 12px;
  font-size: 12px;
}

.btn-block {
  display: block;
  width: 100%;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ========== 表单样式 ========== */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 14px;
  transition: border-color 0.3s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary);
  outline: none;
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-checkbox,
.form-radio {
  margin-right: 8px;
}

.form-error {
  color: var(--error);
  font-size: 12px;
  margin-top: 4px;
}

.form-help {
  color: var(--text-muted);
  font-size: 12px;
  margin-top: 4px;
}

/* ========== 卡片样式 ========== */
.card {
  background: var(--bg-card);
  border-radius: 8px;
  padding: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.card-body {
  color: var(--text-secondary);
}

.card-footer {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

/* ========== 标签样式 ========== */
.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
}

.badge-success {
  background: var(--success);
}

.badge-warning {
  background: var(--warning);
}

.badge-error {
  background: var(--error);
}

.badge-info {
  background: #13c2c2;
}

/* ========== 分隔线 ========== */
.divider {
  height: 1px;
  background: var(--border-color);
  margin: 16px 0;
}

.divider-text {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  font-size: 12px;
  margin: 16px 0;
}

.divider-text::before,
.divider-text::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

.divider-text::before {
  margin-right: 8px;
}

.divider-text::after {
  margin-left: 8px;
}

/* ========== 面包屑导航 ========== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  margin-bottom: 12px;
  font-size: 13px;
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--primary);
}

.breadcrumb .separator {
  color: var(--text-muted);
}

.breadcrumb .current {
  color: var(--text-primary);
}

/* ========== 加载状态 ========== */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 40px;
  color: var(--text-muted);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* ========== 空状态 ========== */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.empty-state-text {
  font-size: 14px;
  margin-bottom: 8px;
}

.empty-state-desc {
  font-size: 12px;
  color: var(--text-muted);
}

/* ========== 响应式工具类 ========== */
@media (min-width: 768px) {
  .container {
    padding: 0 24px;
  }

  .card {
    padding: 24px;
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 32px;
  }

  .card {
    padding: 32px;
  }
}

/* ========== 移动端优化 ========== */
@media (max-width: 767px) {
  .btn-large {
    padding: 10px 20px;
    font-size: 14px;
  }

  .card {
    border-radius: 0;
    box-shadow: none;
    border: none;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
  }
}

/* ========== 工具类 ========== */
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }
.text-muted { color: var(--text-muted); }

.bg-primary { background: var(--primary); }
.bg-success { background: var(--success); }
.bg-warning { background: var(--warning); }
.bg-error { background: var(--error); }
.bg-secondary { background: var(--bg-secondary); }

.border { border: 1px solid var(--border-color); }
.border-top { border-top: 1px solid var(--border-color); }
.border-bottom { border-bottom: 1px solid var(--border-color); }
.border-left { border-left: 1px solid var(--border-color); }
.border-right { border-right: 1px solid var(--border-color); }

.rounded { border-radius: 4px; }
.rounded-lg { border-radius: 8px; }
.rounded-full { border-radius: 9999px; }

.shadow { box-shadow: var(--shadow); }
.shadow-lg { box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15); }
.shadow-none { box-shadow: none; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }

.position-relative { position: relative; }
.position-absolute { position: absolute; }
.position-fixed { position: fixed; }

.d-none { display: none; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.p-0 { padding: 0; }
.p-8 { padding: 8px; }
.p-16 { padding: 16px; }
.p-24 { padding: 24px; }

.m-0 { margin: 0; }
.m-8 { margin: 8px; }
.m-16 { margin: 16px; }
.m-24 { margin: 24px; }