:root {
    --bg-color: #050505;
    --text-color: #e0e0e0;
    --primary-color: #ffcc00; /* 霓虹金 */
    --secondary-color: #bc13fe; /* 霓虹紫 */
    --accent-color: #00f3ff; /* 赛博蓝 */
    --card-bg: #121212;
    --gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

ul {
    list-style: none;
}

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

/* Header & Nav */
header {
    background: rgba(5, 5, 5, 0.9);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 30px;
}

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

/* Search Bar */
.search-container {
    margin-top: 80px;
    padding: 20px 0;
    background: rgba(18, 18, 18, 0.5);
}

.search-box {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-box input {
    width: 100%;
    padding: 15px 25px;
    background: #1a1a1a;
    border: 1px solid var(--secondary-color);
    border-radius: 30px;
    color: #fff;
    outline: none;
    box-shadow: 0 0 15px rgba(188, 19, 254, 0.2);
}

.search-box button {
    position: absolute;
    right: 5px;
    top: 5px;
    padding: 10px 25px;
    background: var(--gradient);
    border: none;
    border-radius: 25px;
    color: #000;
    font-weight: bold;
    cursor: pointer;
}

/* Banner */
.banner {
    height: 80vh;
    background: url('images/banner_main.webp') center/cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
}

.banner::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
}

.banner-content {
    position: relative;
    z-index: 1;
}

.banner h1 {
    font-size: 4rem;
    margin-bottom: 20px;
    text-shadow: 0 0 20px var(--secondary-color);
}

.banner p {
    font-size: 1.5rem;
    margin-bottom: 30px;
}

.btn-primary {
    padding: 15px 40px;
    background: var(--gradient);
    color: #000;
    font-weight: bold;
    border-radius: 5px;
    font-size: 1.1rem;
    display: inline-block;
}

/* Video Cards */
.section-title {
    text-align: center;
    margin: 60px 0 40px;
    font-size: 2.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.video-card {
    background: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    transition: 0.4s;
    border: 1px solid rgba(255, 255, 255, 0.05);
    position: relative;
}

.video-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(188, 19, 254, 0.3);
}

.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: 0.5s;
}

.video-card:hover .video-thumb img {
    transform: scale(1.1);
}

.play-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: 0.3s;
}

.video-card:hover .play-overlay {
    opacity: 1;
}

.play-btn {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #000;
    font-size: 24px;
}

.video-info {
    padding: 20px;
}

.video-info h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: #888;
}

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

.faq-item {
    background: var(--card-bg);
    margin-bottom: 15px;
    border-radius: 5px;
    overflow: hidden;
}

.faq-question {
    padding: 20px;
    cursor: pointer;
    font-weight: bold;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    justify-content: space-between;
}

.faq-answer {
    padding: 20px;
    color: #aaa;
    display: none;
}

/* Reviews */
.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.review-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    border-left: 4px solid var(--primary-color);
}

.user-name {
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 10px;
    display: block;
}

/* Footer */
footer {
    background: #000;
    padding: 60px 0 30px;
    margin-top: 80px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 20px;
    display: block;
}

.footer-links h4 {
    margin-bottom: 20px;
    color: #fff;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: #666;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .banner h1 {
        font-size: 2.5rem;
    }
}