:root {
    --primary-color: #0284C7;
    --primary-hover: #026aa1;
    --text-color: #0C3552;
    --bg-glass: rgba(255, 255, 255, 0.55);
    --border-glass: rgba(255, 255, 255, 1);
    --border-radius: 20px;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    z-index: 1000;
    transition: top 0.2s;
}
.skip-link:focus {
    top: 0;
}
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}
section[id], [id] {
    scroll-margin-top: 90px;
}

/* 修复 details/summary 原生样式 */
details.faq-item {
    cursor: pointer;
}
details.faq-item summary {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    outline: none;
}
details.faq-item p {
    margin-top: 0.5rem;
}
/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 50%, #f0f9ff 100%);
    min-height: 100vh;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: transparent;
    -webkit-font-smoothing: antialiased;
}

/* 独立装饰图层 (背景动效) */
html::before, html::after, body::before, body::after {
    content: ""; position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
    pointer-events: none; z-index: -1;
}

html::before {
    background: radial-gradient(circle at 30% 40%, rgba(14, 165, 233, 0.4) 0%, transparent 50%);
    animation: float1 30s ease-in-out infinite alternate;
}
html::after {
    background: radial-gradient(circle at 70% 60%, rgba(167, 139, 250, 0.3) 0%, transparent 50%);
    animation: float2 38s ease-in-out infinite alternate;
}
body::before {
    background: radial-gradient(circle at 50% 20%, rgba(255, 255, 255, 0.7) 0%, transparent 60%);
    animation: float3 46s ease-in-out infinite alternate;
}
body::after {
    background: radial-gradient(ellipse at 15% 25%, rgba(255, 255, 255, 0.5) 0%, transparent 35%),
                radial-gradient(ellipse at 85% 75%, rgba(255, 255, 255, 0.4) 0%, transparent 35%);
    animation: cloudDrift 80s linear infinite alternate;
}

@keyframes float1 { 0% { transform: translate(0, 0); } 100% { transform: translate(4vw, -2vh); } }
@keyframes float2 { 0% { transform: translate(0, 0); } 100% { transform: translate(-3vw, -3vh); } }
@keyframes float3 { 0% { transform: translate(0, 0); } 100% { transform: translate(3vw, 4vh); } }
@keyframes cloudDrift { 0% { transform: translateX(-4vw); } 100% { transform: translateX(4vw); } }

@media (prefers-reduced-motion: reduce) {
    *, ::before, ::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* 基础样式排版 */
a {
    text-decoration: none;
    color: var(--primary-color);
}

ul {
    list-style: none;
}

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

.bg-light {
    background-color: transparent;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--text-color);
}

/* 按钮通用样式 */
.btn-primary, .btn-primary-small {
    display: inline-block;
    background-color: var(--primary-color);
    color: #fff;
    font-weight: 600;
    text-align: center;
    border-radius: 8px;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.btn-primary {
    padding: 14px 32px;
    font-size: 1.1rem;
}

.btn-primary-small {
    padding: 8px 16px;
    font-size: 0.95rem;
}

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

.btn-primary:active, .btn-primary-small:active {
    transform: scale(0.98);
}

.btn-secondary {
    display: inline-block;
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    font-weight: 600;
    text-align: center;
    border-radius: 8px;
    padding: 12px 30px;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

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

.btn-secondary:active {
    transform: scale(0.98);
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

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

/* 顶部导航 */
.header {
    background: rgba(255, 255, 255, 0.55);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

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

.logo span {
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* 主视觉区 (Hero Section) */
.hero {
    background: transparent;
    padding: 5rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-color);
    margin-bottom: 2.5rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* 栅格布局通用 */
.features, .pricing, .faq {
    padding: 5rem 0;
}

.reviews {
    padding: 5rem 0;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

/* 卡片样式 */
.card {
    background: rgba(255, 255, 255, 0.55);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
    border: 1px solid rgba(255, 255, 255, 1);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

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

/* 流媒体与 AI 支持 */
.streaming-ai {
    padding: 5rem 0;
}

.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.split-content {
    background: rgba(255, 255, 255, 0.55);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 1);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
    transition: transform 0.3s ease;
}

.split-content:hover {
    transform: translateY(-5px);
}

.split-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.split-content p {
    color: var(--text-color);
    font-size: 1.1rem;
}

/* 价格套餐 */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    align-items: center;
}

.price-card {
    background: rgba(255, 255, 255, 0.55);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 3rem 2rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 1);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
    text-align: center;
    position: relative;
}

.price-card.popular {
    border: 2px solid var(--primary-color);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    transform: scale(1.05);
    z-index: 10;
}

.badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: #fff;
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: bold;
}

.price-card h3 {
    font-size: 1.5rem;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.price {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-color);
    margin-bottom: 2rem;
}

.price span {
    font-size: 1.25rem;
    color: var(--text-color);
}

.price-features {
    text-align: left;
    margin-bottom: 2rem;
}

.price-features li {
    padding: 0.5rem 0;
    color: var(--text-color);
    border-bottom: 1px solid rgba(255,255,255,0.4);
}

.price-features li:last-child {
    border-bottom: none;
}

/* 用户评价 */
.review-card {
    background: rgba(255, 255, 255, 0.55);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 1);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
}

.stars {
    color: #fbbf24;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.review-card p {
    font-style: italic;
    color: var(--text-color);
    margin-bottom: 1.5rem;
}

.author {
    font-weight: 600;
    color: var(--text-color);
}

/* FAQ 常见问题 */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.6);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item h4 {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.faq-item p {
    color: var(--text-color);
}

/* 页脚 */
.footer {
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid rgba(255, 255, 255, 1);
    color: var(--text-color);
    padding: 3rem 0;
    text-align: center;
}

.footer-links {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.copyright {
    font-size: 0.9rem;
}

/* 响应式适配媒体查询 (手机端等) */
@media (max-width: 992px) {
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        max-width: 500px;
        margin: 0 auto;
    }
    .price-card.popular {
        transform: none; /* 取消放大效果防止错位 */
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding: 3rem 0;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    /* 单栏显示 */
    .card-grid, .split-layout {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
    
    /* 优化手机端按钮点击区域 */
    .btn-primary, .btn-secondary {
        padding: 16px 24px;
        font-size: 1.1rem;
        width: 100%;
        display: block;
    }
    
    .hero-actions {
        padding: 0 1rem;
        flex-direction: column;
    }
}