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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', Arial, sans-serif;
    font-size: 14px;
    background: #000;
    color: #fff;
    overflow-x: hidden;
    /* 背景图设置 - 已优化 */
    background-image: url('https://cdn.yopngs.com/2026/02/14/38c42b75-8392-4425-af1d-309c29e01ec9.jpg');
    background-size: cover;
    background-position: center top;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

/* 添加一个半透明遮罩层，让文字更清晰 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6); /* 黑色半透明遮罩 */
    z-index: -1;
    pointer-events: none;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    padding: 15px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    border-bottom: 2px solid #1E88E5;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: all 0.3s;
}

.logo:hover {
    transform: scale(1.05);
}

.logo img {
    height: 45px;
    width: auto;
    transition: transform 0.3s;
    filter: drop-shadow(0 0 10px rgba(30, 136, 229, 0.5));
}

.logo:hover img {
    transform: rotate(360deg);
}

.logo span {
    font-size: 24px;
    font-weight: bold;
    background: linear-gradient(45deg, #1E88E5, #90CAF9);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav-links a {
    color: #fff;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #1E88E5;
    transition: width 0.3s;
}

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

/* 主横幅 */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0,0,0,0.3), rgba(0,0,0,0.5));
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(30, 136, 229, 0.15), transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(144, 202, 249, 0.15), transparent 50%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    padding: 20px;
}

.hero h1 {
    font-size: 44px;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 5px;
    animation: slideDown 1s ease-out;
    text-shadow: 0 0 20px rgba(30, 136, 229, 0.8),
                 0 0 40px rgba(30, 136, 229, 0.5),
                 0 5px 10px rgba(0, 0, 0, 0.8);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero p {
    font-size: 20px;
    margin-bottom: 24px;
    color: #fff;
    animation: slideUp 1s ease-out 0.3s both;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8);
}

/* Hero 特性条：静态网络加速 + 安全/稳定/极速/高匿 */
.hero-features {
    text-align: center;
    margin-bottom: 32px;
    animation: fadeIn 1s ease-out 0.4s both;
}
.hero-features-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 16px;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
}
.hero-features-list {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 32px;
    flex-wrap: wrap;
}
.hero-feature-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
}
.hero-feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    color: #1E88E5;
}
.hero-feature-icon svg {
    width: 100%;
    height: 100%;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    animation: fadeIn 1s ease-out 0.6s both;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.btn {
    padding: 16px 40px;
    font-size: 16px;
    font-weight: bold;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn span {
    position: relative;
    z-index: 1;
}

.btn-primary {
    background: linear-gradient(45deg, #1E88E5, #42A5F5);
    color: #fff;
    box-shadow: 0 10px 30px rgba(30, 136, 229, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(30, 136, 229, 0.6);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.btn-secondary:hover {
    background: #fff;
    color: #000;
    transform: translateY(-3px);
}

/* 视频区域 */
.video-section {
    padding: 100px 5%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    position: relative;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 42px;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 3px;
    background: linear-gradient(45deg, #1E88E5, #90CAF9);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-title p {
    font-size: 15px;
    color: #999;
}

.video-container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(30, 136, 229, 0.3);
    width: 100%;
    transition: aspect-ratio 0.35s ease-out;
}

/* 未播放时：由封面图比例决定尺寸（由 JS 设置 aspect-ratio） */
.video-container video {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: contain;
}

.video-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.9));
    padding: 30px;
    color: #fff;
}

.video-overlay h3 {
    font-size: 24px;
    margin-bottom: 10px;
}

/* 特性区域 */
.features-section {
    padding: 100px 5%;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    max-width: 1400px;
    margin: 0 auto;
}

.feature-card {
    background: linear-gradient(135deg, rgba(26, 26, 26, 0.95), rgba(15, 15, 15, 0.95));
    backdrop-filter: blur(10px);
    padding: 40px 30px;
    border-radius: 20px;
    border: 1px solid #222;
    transition: all 0.4s;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, #1E88E5, #90CAF9);
    transform: scaleX(0);
    transition: transform 0.4s;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: #1E88E5;
    box-shadow: 0 20px 50px rgba(30, 136, 229, 0.3);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #1E88E5;
}

.feature-card p {
    font-size: 13px;
    color: #aaa;
    line-height: 1.8;
}

/* 步骤区域 */
.steps-section {
    padding: 100px 5%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
}

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

.step {
    display: flex;
    align-items: center;
    gap: 60px;
    margin-bottom: 80px;
    opacity: 0;
    animation: slideInLeft 0.8s ease-out forwards;
}

.step:nth-child(even) {
    flex-direction: row-reverse;
    animation: slideInRight 0.8s ease-out forwards;
}

.step:nth-child(1) { animation-delay: 0.2s; }
.step:nth-child(2) { animation-delay: 0.4s; }
.step:nth-child(3) { animation-delay: 0.6s; }
.step:nth-child(4) { animation-delay: 0.8s; }

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.step-number {
    min-width: 120px;
    height: 120px;
    background: linear-gradient(135deg, #1E88E5, #90CAF9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 42px;
    font-weight: bold;
    box-shadow: 0 10px 40px rgba(30, 136, 229, 0.5);
    position: relative;
}

.step-number::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 3px solid #1E88E5;
    animation: ripple 2s infinite;
}

@keyframes ripple {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    100% {
        transform: scale(1.5);
        opacity: 0;
    }
}

.step-content {
    flex: 1;
}

.step-content h3 {
    font-size: 28px;
    margin-bottom: 15px;
    color: #1E88E5;
}

.step-content p {
    font-size: 15px;
    color: #aaa;
    line-height: 1.8;
}

.step-image {
    flex: 1;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}

.step-image img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: transform 0.5s;
}

.step:hover .step-image img {
    transform: scale(1.1);
}

/* 图库展示 */
.gallery-section {
    padding: 100px 5%;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    max-width: 1400px;
    margin: 0 auto;
}

.gallery-item {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    cursor: pointer;
    height: 250px;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.gallery-item:hover img {
    transform: scale(1.2);
}

.gallery-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.9));
    display: flex;
    align-items: flex-end;
    padding: 20px;
    opacity: 0;
    transition: opacity 0.3s;
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-overlay h4 {
    font-size: 17px;
    color: #1E88E5;
}

/* 下载区域 */
.download-section {
    padding: 100px 5%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    text-align: center;
}

.download-content {
    max-width: 800px;
    margin: 0 auto;
}

.download-content h2 {
    font-size: 44px;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.download-content p {
    font-size: 20px;
    color: #aaa;
    margin-bottom: 40px;
}

.version-info {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin: 40px 0;
    flex-wrap: wrap;
}

.version-item {
    background: rgba(26, 26, 26, 0.8);
    backdrop-filter: blur(10px);
    padding: 20px 40px;
    border-radius: 10px;
    border: 1px solid #333;
}

.version-item span {
    display: block;
    color: #666;
    font-size: 12px;
    margin-bottom: 5px;
}

.version-item strong {
    font-size: 18px;
    color: #1E88E5;
}

/* 页脚 */
.footer {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    padding: 60px 5% 30px;
    border-top: 1px solid #222;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    color: #1E88E5;
    margin-bottom: 20px;
    font-size: 20px;
}

.footer-section ul {
    list-style: none;
}

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

.footer-section a {
    color: #999;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: #1E88E5;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #222;
    color: #666;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 42px;
    }
    
    .hero p {
        font-size: 18px;
    }
    
    .hero-features-desc {
        font-size: 14px;
    }
    .hero-features-list {
        gap: 20px;
    }
    .hero-feature-item {
        font-size: 13px;
    }
    .hero-feature-icon {
        width: 24px;
        height: 24px;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .section-title h2 {
        font-size: 36px;
    }
    
    .step {
        flex-direction: column !important;
        text-align: center;
    }
    
    .step-number {
        min-width: 80px;
        height: 80px;
        font-size: 36px;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .version-info {
        flex-direction: column;
        gap: 20px;
    }
}

/* 滚动动画 */
.scroll-reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease-out;
}

.scroll-reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* 返回顶部按钮样式 */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #1E88E5 0%, #42A5F5 50%, #90CAF9 100%);
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 
        0 5px 20px rgba(30, 136, 229, 0.5),
        0 0 0 0 rgba(30, 136, 229, 0.7);
    z-index: 999;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0;
    overflow: hidden;
}

#backToTop::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transform: scale(0);
    transition: transform 0.3s;
}

#backToTop:hover::before {
    transform: scale(1);
}

#backToTop:hover {
    transform: translateY(-8px) scale(1.08);
    box-shadow: 
        0 10px 35px rgba(30, 136, 229, 0.8),
        0 0 0 10px rgba(30, 136, 229, 0.1),
        0 0 0 20px rgba(30, 136, 229, 0.05);
    border-color: rgba(255, 255, 255, 0.5);
}

#backToTop:active {
    transform: translateY(-5px) scale(1);
}

#backToTop img {
    width: 32px;
    height: 32px;
    object-fit: contain;
    transition: transform 0.3s;
    position: relative;
    z-index: 1;
}

#backToTop:hover img {
    transform: translateY(-3px);
    animation: rocketFly 0.6s ease infinite;
}

@keyframes rocketFly {
    0%, 100% { transform: translateY(-3px); }
    50% { transform: translateY(-8px); }
}

/* 手机端适配 */
@media (max-width: 768px) {
    #backToTop {
        width: 50px;
        height: 50px;
        bottom: 20px;
        right: 20px;
    }
    
    #backToTop img {
        width: 24px;
        height: 24px;
    }
}