/* 统一全局样式 - TikTok专线服务 */
:root {
    --primary-blue: #3b82f6;
    --primary-purple: #6366f1;
    --primary-gradient: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --border-radius: 0.75rem;
}

/* 基础重置和字体优化 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-light);
}

/* 导航栏样式优化 */
.navbar {
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.nav-link {
    position: relative;
    color: var(--text-gray);
    transition: color 0.3s ease;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--primary-blue);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* 按钮样式优化 */
.btn-primary {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: white;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: var(--primary-blue);
    color: white;
    transform: translateY(-2px);
}

/* 卡片样式 */
.card {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-feature {
    padding: 2rem;
    text-align: center;
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
}

.card-pricing {
    position: relative;
    overflow: hidden;
}

.card-pricing.featured {
    border: 2px solid var(--primary-blue);
    transform: scale(1.05);
}

/* 图标样式 */
.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
}

/* 响应式设计优化 */
@media (max-width: 768px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .card-pricing.featured {
        transform: none;
        margin-bottom: 2rem;
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
}

/* 加载动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 视差滚动效果 */
.parallax-bg {
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

/* 地球可视化样式优化 */
.earth-container {
    position: relative;
    height: 500px;
    background: linear-gradient(135deg, #1e3a8a, #3730a3);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.country-marker {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--primary-blue);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.3);
    animation: pulse 2s infinite;
    cursor: pointer;
    transition: all 0.3s ease;
}

.country-marker:hover {
    transform: scale(1.5);
    background: #ef4444;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(59, 130, 246, 0); }
    100% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0); }
}

/* 页脚样式优化 */
.footer {
    background: linear-gradient(135deg, #111827, #1f2937);
    color: #9ca3af;
    padding: 3rem 0 1rem;
}

.footer a {
    color: #d1d5db;
    transition: color 0.3s ease;
}

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

/* 浮动客服面板优化 */
.float-contact {
    position: fixed;
    right: 2rem;
    bottom: 2rem;
    z-index: 1000;
}

.contact-panel {
    position: absolute;
    right: 0;
    bottom: 5rem;
    width: 280px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    padding: 1.5rem;
    transform: translateY(10px);
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
}

.contact-panel.show {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
}

/* 移动端优化 */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: white;
    z-index: 1001;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
}

.mobile-menu.show {
    transform: translateX(0);
}

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.mobile-menu-overlay.show {
    opacity: 1;
    pointer-events: all;
}

/* 性能优化 */
.lazy-load {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-load.loaded {
    opacity: 1;
}

/* 无障碍优化 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 焦点状态 */
button:focus,
a:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* 打印样式 */
@media print {
    .navbar,
    .float-contact,
    .mobile-menu {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}