:root {
    --primary-color: #f0abfc; /* 霓虹粉紫 */
    --primary-hover: #d946ef;
    --accent-color: #22d3ee; /* 赛博青色 */
    --bg-color: #030305; /* 深邃黑 */
    --card-bg: rgba(18, 18, 26, 0.85); /* 更明显的半透明面板底色 */
    --text-main: #f8fafc;
    --text-muted: #a1a1aa;
    --border-color: rgba(34, 211, 238, 0.2); /* 赛博青色边框，增加可见度 */
}

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

body {
    font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-color);
    overflow-x: hidden;
    /* 底部微弱的双色环境光晕 */
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(217, 70, 239, 0.15), transparent 40%),
        radial-gradient(circle at 85% 20%, rgba(34, 211, 238, 0.15), transparent 40%);
}

/* 动效 1：斜向滚动的赛博数据线 */
body::before {
    content: '';
    position: fixed;
    top: -50%; left: -50%; width: 200%; height: 200%;
    z-index: -2;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 60px,
        rgba(34, 211, 238, 0.2) 60px,
        rgba(34, 211, 238, 0.2) 62px,
        transparent 62px,
        transparent 120px,
        rgba(217, 70, 239, 0.15) 120px,
        rgba(217, 70, 239, 0.15) 122px
    );
    animation: moveLines 40s linear infinite;
    pointer-events: none;
}

@keyframes moveLines {
    0% { transform: translate(0, 0); }
    100% { transform: translate(-60px, 60px); }
}

/* 动效 2：雷达扫描线从上至下周期性扫过 */
body::after {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: -1;
    background: linear-gradient(to bottom, transparent, rgba(217, 70, 239, 0.2) 50%, transparent);
    background-size: 100% 20px;
    background-repeat: no-repeat;
    animation: scan 6s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    pointer-events: none;
}

@keyframes scan {
    0% { transform: translateY(-10vh); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(110vh); opacity: 0; }
}

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

/* Typography */
h1, h2, h3 {
    margin-bottom: 1rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
}

h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 3rem;
    padding-top: 4rem;
    color: var(--text-main);
}

a {
    text-decoration: none;
    color: var(--primary-color);
}

/* Header & Nav */
header {
    background-color: rgba(3, 3, 5, 0.9);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 18px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--text-main);
    letter-spacing: 2px;
    text-shadow: 2px 2px 0px rgba(217, 70, 239, 0.5), -2px -2px 0px rgba(34, 211, 238, 0.5);
    transition: all 0.3s;
}

.logo:hover {
    text-shadow: 3px 3px 0px rgba(217, 70, 239, 0.8), -3px -3px 0px rgba(34, 211, 238, 0.8);
}

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

.nav-links a {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0; height: 2px;
    bottom: -4px; left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s;
}

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

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

/* Buttons - Cyberpunk Style */
.btn {
    display: inline-block;
    padding: 14px 30px;
    background: transparent;
    color: var(--primary-color);
    font-size: 1rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
    border: 1px solid var(--primary-hover);
    border-radius: 0; /* 直角边缘 */
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    box-shadow: inset 0 0 15px rgba(217, 70, 239, 0.1), 0 0 15px rgba(217, 70, 239, 0.1);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0; left: -100%; width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    background: var(--primary-hover);
    color: #fff;
    box-shadow: 0 0 25px rgba(217, 70, 239, 0.5);
    border-color: var(--primary-hover);
}

.btn-large {
    padding: 16px 36px;
    font-size: 1.1rem;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.btn-header {
    padding: 10px 24px;
    font-size: 0.95rem;
    background: rgba(34, 211, 238, 0.1);
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    box-shadow: 0 0 10px rgba(34, 211, 238, 0.2);
}

.btn-header:hover {
    background: var(--accent-color);
    color: #000;
    box-shadow: 0 0 20px rgba(34, 211, 238, 0.5);
    border-color: var(--accent-color);
}

/* Hero Section */
.hero {
    position: relative;
    text-align: center;
    padding: 10rem 20px;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
    /* Glitch/Neon Text Effect */
    text-shadow: 0 0 10px rgba(255,255,255,0.3), 0 0 20px var(--primary-color), 0 0 40px var(--primary-hover);
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
    letter-spacing: 0.5px;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 5rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 3rem 2rem;
    border: 1px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    backdrop-filter: blur(8px);
}

.feature-card::after {
    content: '';
    position: absolute;
    bottom: 0; right: 0;
    width: 20px; height: 20px;
    border-bottom: 2px solid var(--text-muted);
    border-right: 2px solid var(--text-muted);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-top-color: var(--accent-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.feature-card:hover .feature-icon {
    color: var(--accent-color);
    text-shadow: 0 0 15px rgba(34, 211, 238, 0.5);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    transition: all 0.3s;
}

/* Streaming & AI */
.media-ai {
    background: repeating-linear-gradient(
        -45deg,
        #050505,
        #050505 10px,
        #09090b 10px,
        #09090b 20px
    );
    padding: 6rem 20px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.media-icons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.media-icons span {
    padding: 12px 24px;
    background: var(--bg-color);
    color: var(--accent-color);
    font-weight: 700;
    letter-spacing: 1px;
    border: 1px solid rgba(34, 211, 238, 0.3);
    box-shadow: inset 0 0 10px rgba(34, 211, 238, 0.1);
    text-transform: uppercase;
}

/* Pricing */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 5rem;
}

.price-card {
    background: var(--card-bg);
    padding: 3rem 2.5rem;
    border: 1px solid var(--border-color);
    text-align: center;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: all 0.3s ease;
    backdrop-filter: blur(8px);
}

.price-card:hover {
    border-color: var(--primary-hover);
}

.price-card.popular {
    border-color: var(--accent-color);
    box-shadow: 0 0 30px rgba(34, 211, 238, 0.1);
    transform: translateY(-10px);
}

.price-card.popular::before {
    content: '[ 推荐配置 ]';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-color);
    color: var(--accent-color);
    padding: 0 10px;
    font-size: 0.85rem;
    font-weight: bold;
    letter-spacing: 2px;
}

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

.price-amount {
    font-size: 3rem;
    font-weight: 900;
    color: var(--text-main);
    margin-bottom: 2rem;
}

.price-amount span {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: normal;
}

.price-features {
    list-style: none;
    margin-bottom: 2.5rem;
    flex-grow: 1;
    text-align: left;
}

.price-features li {
    margin-bottom: 1.2rem;
    color: var(--text-main);
    padding-left: 1.5rem;
    position: relative;
}

.price-features li::before {
    content: '>';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Reviews & FAQ */
.reviews-grid, .faq-list {
    margin-bottom: 5rem;
}

.review-card, .faq-item {
    background: var(--card-bg);
    padding: 2.5rem 2rem;
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-hover);
    margin-bottom: 2rem;
    transition: all 0.3s;
    backdrop-filter: blur(8px);
}

.review-card:hover, .faq-item:hover {
    border-color: var(--accent-color);
    border-left-color: var(--accent-color);
    background: rgba(34, 211, 238, 0.05);
    box-shadow: 0 0 20px rgba(34, 211, 238, 0.1);
    transform: translateX(5px);
}

.review-text {
    font-family: monospace;
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

.review-author {
    font-weight: bold;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto 4rem auto;
}

.faq-q {
    font-weight: bold;
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.faq-q::before {
    content: '? ';
    color: var(--primary-color);
}

.faq-a {
    color: var(--text-muted);
    padding-left: 1.5rem;
}

/* Footer */
footer {
    background: #000;
    border-top: 1px solid var(--border-color);
    padding: 4rem 20px 3rem 20px;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.footer-links a {
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
    transition: color 0.3s;
}

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

/* Subpages Content */
.subpage-content {
    background: var(--card-bg);
    padding: 4rem 3rem;
    border: 1px solid var(--border-color);
    margin: 4rem auto;
}

.subpage-content h1 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.subpage-content h3 {
    margin-top: 3rem;
    color: var(--text-main);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 15px;
    }
    
    .header-right {
        flex-direction: column;
        gap: 15px;
        width: 100%;
    }
    
    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h1 {
        font-size: 2.8rem;
    }
    
    h2 {
        font-size: 1.8rem;
    }
    
    .btn {
        width: 100%;
        display: block;
        box-sizing: border-box;
    }
    
    .price-card.popular {
        transform: none;
    }
}

/* Accessibility & Details Fix */
.skip-link { position: absolute; top: -100px; left: 0; background: var(--primary-color); color: #000; padding: 12px 24px; z-index: 1000; transition: top 0.2s; font-weight: bold; border-bottom-right-radius: 8px; }
.skip-link:focus { top: 0; }
:focus-visible { outline: 2px solid var(--accent-color); outline-offset: 4px; }
h1, h2, h3, h4, h5, h6, [id] { scroll-margin-top: 100px; }
details > summary { list-style: none; }
details > summary::-webkit-details-marker { display: none; }