/* 简洁专业设计 - 基于ultrathink优秀设计理念 */

/* 重置和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #2d3748;
    background-color: #f7fafc;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Hero 头部样式 - 简洁渐变 */
.hero {
    position: relative;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
    overflow: hidden;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50px;
    padding: 8px 20px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    font-weight: 400;
    opacity: 0.9;
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.feature-tag {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 25px;
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.hero-text {
    font-size: 3rem;
    margin-top: 20px;
}

/* 语言选择器 - 简洁设计 */
.language-selector {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.language-select {
    padding: 10px 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 8px;
    background: rgba(255,255,255,0.2);
    color: white;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
}

.language-select:hover {
    background: rgba(255,255,255,0.3);
    border-color: rgba(255,255,255,0.5);
}

.language-select option {
    background: white;
    color: #2d3748;
}

/* 主要内容区域 */
main {
    background: #f7fafc;
}

/* Experience 体验区域 */
.experience {
    padding: 80px 0;
    background: white;
}

.experience h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #2d3748;
    font-weight: 700;
}

.experience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.experience-card {
    background: white;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 2px solid #f7fafc;
    position: relative;
}

.experience-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.experience-card.highlight {
    border-color: #667eea;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.experience-card.highlight::before {
    content: '🔥 推荐';
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: #ff6b6b;
    color: white;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    box-shadow: 0 4px 10px rgba(255, 107, 107, 0.3);
}

.card-header h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 5px;
    margin-bottom: 25px;
}

.price-amount {
    font-size: 3rem;
    font-weight: 800;
    color: #667eea;
}

.experience-card.highlight .price-amount {
    color: white;
}

.price-period {
    font-size: 1.2rem;
    color: #718096;
}

.experience-card.highlight .price-period {
    color: rgba(255, 255, 255, 0.8);
}

.feature-list {
    list-style: none;
    margin-bottom: 30px;
    text-align: left;
}

.feature-list li {
    padding: 10px 0;
    color: #4a5568;
    font-size: 1rem;
    line-height: 1.5;
}

.experience-card.highlight .feature-list li {
    color: rgba(255, 255, 255, 0.9);
}

.plan-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    text-decoration: none;
    display: inline-block;
}

.plan-button.featured {
    background: white;
    color: #667eea;
    border: 2px solid white;
}

.plan-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.plan-button.featured:hover {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.3);
}

/* Comparison 对比区域 */
.comparison {
    padding: 80px 0;
    background: #f7fafc;
}

.comparison h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #2d3748;
    font-weight: 700;
}

.comparison-desc {
    text-align: center;
    font-size: 1.2rem;
    color: #4a5568;
    margin-bottom: 50px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.comparison-table {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.comparison-header {
    display: grid;
    grid-template-columns: 2fr 1fr 3fr;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: 600;
    font-size: 1.1rem;
}

.comparison-header > div {
    padding: 20px;
    text-align: center;
}

.comparison-row {
    display: grid;
    grid-template-columns: 2fr 1fr 3fr;
    border-bottom: 1px solid #e2e8f0;
    transition: background-color 0.2s ease;
}

.comparison-row:hover {
    background-color: #f8f9ff;
}

.comparison-row.winner {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    border-left: 4px solid #667eea;
}

.comparison-row > div {
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.model-name {
    font-weight: 600;
    color: #2d3748;
    font-size: 1.1rem;
}

.crown {
    margin-right: 8px;
    font-size: 1.2rem;
}

.result.success {
    background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.result.fail {
    color: #e53e3e;
    font-weight: 600;
}

.cta-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

/* Advantages 优势区域 */
.advantages {
    padding: 80px 0;
    background: white;
}

.advantages h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #2d3748;
    font-weight: 700;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.advantage-card {
    background: white;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 2px solid #f7fafc;
}

.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
    border-color: #667eea;
}

.advantage-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.advantage-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #2d3748;
}

.advantage-card p {
    color: #4a5568;
    line-height: 1.6;
    font-size: 1rem;
}

/* Pain Points 痛点区域 */
.pain-points {
    padding: 80px 0;
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
    color: white;
}

.pain-points-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.pain-points h2 {
    font-size: 2.5rem;
    margin-bottom: 40px;
    font-weight: 700;
}

.pain-point-item {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 1.2rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 15px 30px;
    border-radius: 10px;
    backdrop-filter: blur(10px);
}

.pain-icon {
    margin-right: 15px;
    font-size: 1.5rem;
}

/* Solutions 解决方案区域 */
.solutions {
    padding: 80px 0;
    background: #f7fafc;
}

.solutions h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #2d3748;
    font-weight: 700;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    max-width: 1200px;
    margin: 0 auto;
}

.solution-card {
    background: white;
    padding: 30px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 2px solid #f7fafc;
}

.solution-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
    border-color: #667eea;
}

.solution-icon {
    font-size: 1.3rem;
    font-weight: 600;
    color: #667eea;
    margin-bottom: 15px;
}

.solution-card p {
    color: #4a5568;
    line-height: 1.6;
    font-size: 1rem;
}

/* FAQ section */
.faq {
    padding: 80px 0;
    background: white;
}

.faq h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #2d3748;
    font-weight: 700;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: #f7fafc;
    margin-bottom: 20px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s ease;
}

.faq-item:hover {
    transform: translateY(-2px);
}

.faq-item h3 {
    padding: 25px;
    font-size: 1.2rem;
    font-weight: 600;
    color: #2d3748;
    background: white;
    margin: 0;
    border-bottom: 1px solid #e2e8f0;
}

.faq-item p {
    padding: 25px;
    color: #4a5568;
    line-height: 1.6;
    margin: 0;
    background: #f7fafc;
}

/* Contact 联系区域 */
.contact {
    padding: 80px 0;
    background: #f7fafc;
}

.contact h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #2d3748;
    font-weight: 700;
}

.contact p {
    text-align: center;
    font-size: 1.2rem;
    color: #4a5568;
    margin-bottom: 40px;
}

.contact-info {
    max-width: 600px;
    margin: 0 auto;
    display: grid;
    gap: 20px;
}

.contact-item {
    text-align: center;
    padding: 25px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s ease;
}

.contact-item:hover {
    transform: translateY(-3px);
}

.contact-item span,
.contact-item a {
    font-size: 1.1rem;
    color: #2d3748;
    font-weight: 500;
    text-decoration: none;
}

.contact-item a {
    color: #667eea;
}

.contact-item a:hover {
    color: #5a67d8;
}

/* Final CTA 最终行动号召 */
.final-cta {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.final-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

.final-cta h2 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.final-cta p {
    font-size: 1.3rem;
    margin-bottom: 40px;
    opacity: 0.9;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
    z-index: 1;
    line-height: 1.6;
}

.final-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.cta-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    min-width: 200px;
}

.cta-button.primary {
    background: white;
    color: #667eea;
    border: 2px solid white;
}

.cta-button.secondary {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.cta-button.large {
    padding: 18px 40px;
    font-size: 1.2rem;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.cta-button.primary:hover {
    background: rgba(255, 255, 255, 0.95);
    color: #5a67d8;
}

.cta-button.secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

/* Footer 底部 */
footer {
    background: #2d3748;
    color: white;
    padding: 50px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-content p {
    margin: 0;
    opacity: 0.9;
    font-size: 1rem;
}

.footer-links {
    display: flex;
    gap: 25px;
    flex-wrap: wrap;
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.2s ease, color 0.2s ease;
    font-weight: 500;
}

.footer-links a:hover {
    opacity: 1;
    color: #667eea;
}

/* 响应式设计 */
/* 响应式设计 */
@media (max-width: 768px) {
    .hero {
        padding: 60px 0;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-features {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .language-selector {
        position: relative;
        top: 0;
        right: 0;
        margin: 20px 0;
        text-align: center;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .experience,
    .comparison,
    .advantages,
    .pain-points,
    .solutions,
    .faq,
    .contact,
    .final-cta {
        padding: 60px 0;
    }
    
    .experience-grid,
    .advantages-grid,
    .solutions-grid {
        grid-template-columns: 1fr;
    }
    
    .comparison-header,
    .comparison-row {
        grid-template-columns: 1fr;
        text-align: left;
    }
    
    .comparison-header > div,
    .comparison-row > div {
        padding: 15px;
        border-bottom: 1px solid #e2e8f0;
    }
    
    .price-amount {
        font-size: 2.5rem;
    }
    
    .final-cta h2 {
        font-size: 2.2rem;
    }
    
    .final-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 性能优化 */
* {
    will-change: auto;
}

.experience-card,
.advantage-card,
.solution-card,
.cta-button,
.plan-button {
    will-change: transform;
}

/* 通用按钮样式 */
a.cta-button {
    text-decoration: none;
}

/* 选择文本样式 */
::selection {
    background: #667eea;
    color: white;
}

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

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.experience-card.highlight {
    animation: pulse 3s ease-in-out infinite;
}

/* 隐藏类 */
.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;
}

/* 可访问性增强 */
.cta-button:focus,
.plan-button:focus {
    outline: 3px solid rgba(102, 126, 234, 0.5);
    outline-offset: 2px;
}