:root {
    --primary: #4361ee;
    --primary-light: #4895ef;
    --primary-dark: #3a0ca3;
    --secondary: #f72585;
    --success: #4cc9f0;
    --warning: #f8961e;
    --danger: #e63946;
    --light: #f8f9fa;
    --dark: #212529;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
    
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    --gradient-primary: linear-gradient(135deg, #4361ee 0%, #3a0ca3 100%);
    --gradient-secondary: linear-gradient(135deg, #f72585 0%, #7209b7 100%);
    --gradient-success: linear-gradient(135deg, #4cc9f0 0%, #4895ef 100%);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background-color: #f5f7ff;
    color: var(--gray-800);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#app {
    opacity: 0;
    transition: opacity 0.5s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
}

.container {
    max-width: 1200px;
    padding-left: 20px;
    padding-right: 20px;
}

/* 现代卡片样式 */
.card {
    border: none;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: white;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.card-lg {
    border-radius: var(--radius-lg);
}

.card-xl {
    border-radius: var(--radius-xl);
}

/* 现代按钮 */
.btn {
    border-radius: 8px;
    font-weight: 500;
    padding: 10px 20px;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    border: none;
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #3a0ca3 0%, #4361ee 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(67, 97, 238, 0.3);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.1rem;
    border-radius: 12px;
}

/* 价格标签 */
.price-tag {
    font-weight: 700;
    font-size: 1.4rem;
    color: var(--danger);
    position: relative;
    display: inline-block;
}

.price-tag::before {
    content: '¥';
    font-size: 0.8em;
    margin-right: 2px;
}

.price-tag-large {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--danger);
}

/* 标签样式 */
.tag {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    color: white;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-right: 8px;
    margin-bottom: 8px;
}

.tag-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.tag-lg {
    padding: 8px 18px;
    font-size: 1rem;
}

/* 头像样式 */
.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1rem;
}

.user-avatar-large {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.5rem;
}

/* 表单样式 */
.form-control, .form-select {
    border: 2px solid var(--gray-300);
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
    outline: none;
}

/* 空状态 */
.empty-state {
    padding: 80px 20px;
    text-align: center;
}

.empty-state i {
    font-size: 5rem;
    margin-bottom: 24px;
    opacity: 0.3;
    display: inline-block;
}

/* 加载动画 */
.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid rgba(67, 97, 238, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}

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

/* 动画效果 */
.fade-in {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in {
    animation: slideIn 0.4s ease;
}

@keyframes slideIn {
    from { transform: translateX(-20px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* 徽章 */
.badge-modern {
    padding: 6px 12px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
}

/* 分隔线 */
.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gray-300), transparent);
    margin: 24px 0;
}

/* 工具提示 */
.tooltip-custom {
    position: relative;
}

.tooltip-custom::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--dark);
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.tooltip-custom:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-8px);
}

/* 进度条 */
.progress-bar {
    height: 6px;
    background: var(--gray-200);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 3px;
    transition: width 0.3s ease;
}