/* ==================== 统一设计系统 ==================== */

:root {
  /* 主色调系统 */
  --primary-color: #137fec;
  --primary-hover: #0f6fd9;
  --primary-light: #e6f3ff;
  --primary-dark: #0b5fc7;
  
  /* 辅助色彩 */
  --secondary-color: #64748b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --info-color: #3b82f6;
  
  /* 背景色 */
  --background: #f8fafc;
  --surface: #ffffff;
  --surface-hover: #f1f5f9;
  
  /* 文字色彩 */
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  
  /* 边框和分割线 */
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  
  /* 圆角 */
  --radius-sm: 0.25rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  
  /* 字体 */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* ==================== 基础样式重置 ==================== */

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

body {
  font-family: var(--font-family);
  background-color: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==================== 统一头部样式 ==================== */

.app-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.app-header .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.app-header .header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.app-header .logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}

.app-header .logo-icon {
  width: 2rem;
  height: 2rem;
  background: var(--primary-color);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.app-header .logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.app-header .header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* ==================== 统一底部样式 ==================== */

.app-footer {
  margin-top: 3rem;
  padding: 2rem 0 1.5rem;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.app-footer .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.app-footer .footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.app-footer .footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.app-footer .footer-link:hover {
  color: var(--primary-color);
}

.app-footer .footer-copyright {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ==================== 统一按钮样式 ==================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text-primary);
  border-color: var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--surface-hover);
  border-color: var(--border-hover);
}

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-outline:hover:not(:disabled) {
  background: var(--primary-color);
  color: white;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1rem;
}

/* ==================== 统一表单样式 ==================== */

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.875rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem;
  font-size: 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-control::placeholder {
  color: var(--text-muted);
}

/* ==================== 统一卡片样式 ==================== */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.card-body {
  padding: 1.5rem;
}

.card-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  background: var(--surface-hover);
}

/* ==================== 统一消息提示 ==================== */

.message {
  position: fixed;
  top: 1rem;
  right: 1rem;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 9999;
  animation: slideIn 0.3s ease;
  max-width: 400px;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.message-success {
  background: var(--success-color);
  color: white;
}

.message-error {
  background: var(--error-color);
  color: white;
}

.message-warning {
  background: var(--warning-color);
  color: white;
}

.message-info {
  background: var(--info-color);
  color: white;
}

/* ==================== 响应式设计 ==================== */

@media (max-width: 768px) {
  .app-header .logo-text {
    font-size: 1.25rem;
  }
  
  .app-footer .footer-links {
    gap: 1rem;
  }
  
  .btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.8125rem;
  }
}

@media (max-width: 640px) {
  .app-header .container,
  .app-footer .container {
    padding: 0 0.75rem;
  }
  
  .app-footer .footer-links {
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
  }
}

/* ==================== 工具类 ==================== */

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

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

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

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

.transition { transition: all 0.2s ease; }