@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;600;700&display=swap');

:root {
    --bg: #09090b;
    --card-bg: rgba(24, 24, 27, 0.6);
    --text-main: #f4f4f5;
    --text-muted: #a1a1aa;
    --accent: #3b82f6; /* 现代感幽蓝色 */
    --accent-glow: rgba(59, 130, 246, 0.4);
    --border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-width;
    font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--bg);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

/* =========================================
   顶部悬浮椭圆形导航栏 (Floating Pill Navbar)
   ========================================= */
.navbar {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: 85%;
    max-width: 1100px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(24, 24, 27, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 50px; 
    padding: 0.6rem 0.6rem 0.6rem 2rem;
    z-index: 1000;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #fff;
}

.navbar .CTA-btn {
    margin: 0;
}

/* 移动端椭圆导航适配 */
@media (max-width: 991px) {
    .navbar {
        top: 15px;
        width: 92%;
        flex-direction: column;
        border-radius: 32px;
        padding: 1.5rem;
    }
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.8rem;
        margin: 1.5rem 0;
    }
    .nav-links a {
        background: rgba(255,255,255,0.05);
        padding: 0.5rem 1.2rem;
        border-radius: 50px;
        font-size: 0.85rem;
    }
    .navbar .CTA-btn {
        width: 100%;
    }
}

/* =========================================
   圆润流畅的椭圆形按钮 (Pill Buttons)
   ========================================= */
.btn-nav, .btn-primary, .btn-outline {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-align: center;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-nav {
    padding: 0.7rem 1.5rem;
}

.btn-primary, .btn-nav {
    background: var(--accent);
    color: #fff;
    border: 1px solid var(--accent);
    box-shadow: 0 4px 15px var(--accent-glow);
}
.btn-primary:hover, .btn-nav:hover {
    background: #2563eb;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--accent-glow);
}

.btn-outline {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
    border: 1px solid var(--border);
}
.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* =========================================
   全局区块与卡片设计 (居中排版，防止大屏过宽)
   ========================================= */
section {
    padding: 6rem 5%;
    position: relative;
}

h2 {
    font-size: 2.2rem;
    margin-bottom: 4rem;
    text-align: center;
    font-weight: 700;
    background: linear-gradient(to right, #fff, #9ca3af);
    -webkit-background-clip: text;
    color: transparent;
}

/* Hero Section 主视觉区 - 全新居中排版 */
.hero {
    display: flex;
    flex-direction: column; /* 垂直居中堆叠 */
    justify-content: center;
    align-items: center;
    text-align: center;
    min-height: 100vh;
    padding-top: 150px; 
    background: radial-gradient(circle at 50% -20%, rgba(59, 130, 246, 0.15) 0%, var(--bg) 80%);
    position: relative;
}

.hero-content {
    max-width: 800px;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-content h1 {
    font-size: clamp(2.8rem, 5vw, 4.5rem);
    line-height: 1.15;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 650px;
}

.hero-visual {
    position: absolute;
    top: 0; left: 0; 
    width: 100%; height: 100%;
    z-index: 1;
    pointer-events: none; /* 穿透点击，不影响中间的按钮 */
}

@media (max-width: 991px) {
    .hero { padding-top: 240px; min-height: auto;}
    .hero-visual { display: none; }
}

/* 悬浮装饰卡片 - 环绕在中心文字周围 */
.floating-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    padding: 0.8rem 1.5rem;
    border: 1px solid var(--border);
    border-radius: 50px; 
    color: #fff;
    font-weight: 600;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.c1 { top: 25%; left: 15%; animation: float 6s ease-in-out infinite; }
.c2 { top: 55%; right: 15%; animation: float 5s ease-in-out infinite alternate; }
.c3 { bottom: 20%; left: 25%; animation: float 7s ease-in-out infinite alternate-reverse; }

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0px); }
}

/* 通用网格 - 限制最大宽度，整体居中不发散 */
.feature-grid, .stream-grid, .price-grid, .article-grid, .review-grid {
    display: grid;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}
.feature-grid, .price-grid, .article-grid, .review-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
.stream-grid {
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

/* 卡片基础 (柔和的大圆角) */
.feature-card, .price-card, .review-card, .article-card, .stream-card, .faq-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 2.5rem;
    transition: all 0.3s ease;
}

.feature-card:hover, .review-card:hover, .article-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.4);
}

.feature-card .icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.feature-card h3, .faq-item h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

/* 定价表 */
.price-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}
.price-card.popular {
    background: linear-gradient(180deg, rgba(59, 130, 246, 0.1) 0%, rgba(24, 24, 27, 0.6) 100%);
    border: 1px solid var(--accent);
    transform: scale(1.05);
}
.price-card.popular:hover {
    transform: scale(1.05) translateY(-5px);
}
@media (max-width:991px){
    .price-card.popular { transform: none; }
    .price-card.popular:hover { transform: translateY(-5px); }
}
.badge {
    background: var(--accent);
    color: #fff;
    padding: 0.4rem 1.2rem;
    font-size: 0.85rem;
    font-weight: 700;
    border-radius: 50px;
    position: absolute;
    top: -15px;
}
.price {
    font-size: 3.5rem;
    font-weight: 700;
    margin: 1.5rem 0;
    color: #fff;
}
.price span {
    font-size: 1rem;
    color: var(--text-muted);
}
.price-card ul {
    list-style: none;
    margin-bottom: 2.5rem;
    width: 100%;
}
.price-card ul li {
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    color: var(--text-muted);
}

/* SEO 文章 */
.article-card {
    padding: 0;
    overflow: hidden; 
    display: flex;
    flex-direction: column;
}
.article-cover {
    height: 180px;
    background-size: cover;
    background-position: center;
    transition: transform 0.5s ease;
}
.article-card:hover .article-cover {
    transform: scale(1.05);
}
.article-card h3 {
    padding: 1.5rem 1.5rem 0.5rem;
    font-size: 1.2rem;
}
.article-card p {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-muted);
}

/* 流媒体与 AI */
.ai-card {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(24, 24, 27, 0.6) 100%);
    border: 1px solid rgba(16, 185, 129, 0.3);
}
.media-card {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(24, 24, 27, 0.6) 100%);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* 常见问题 */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.faq-item {
    padding: 1.5rem 2rem;
    cursor: pointer;
}

/* 页脚 */
.site-footer {
    padding: 4rem 5%;
    text-align: center;
    background: rgba(0, 0, 0, 0.2);
}
.footer-nav {
    margin-bottom: 2rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}
.footer-nav a {
    color: var(--text-muted);
    font-weight: 600;
}
.footer-nav a:hover {
    color: #fff;
}
.seo-links-container {
    margin: 2rem 0;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}
.seo-link {
    color: var(--accent);
    margin: 0 1rem;
}
.copyright {
    color: var(--text-muted);
    font-size: 0.9rem;
}