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

:root {
    --primary: #1976D2;
    --primary-dark: #0D47A1;
    --secondary: #FF5722;
    --accent: #FFC107;
    --dark: #263238;
    --light: #f8f9fa;
    --gray: #607D8B;
    --white: #ffffff;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    color: var(--dark);
    line-height: 1.6;
    background-color: var(--light);
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

    .logo img {
        height: 38px;
    }

    .logo h1 {
        font-size: 1.5rem;
        font-weight: 700;
    }

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
}


nav a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.3s;
    padding: 8px 12px;
    border-radius: 4px;
}

    nav a:hover, nav a.active {
        background: rgba(255, 255, 255, 0.15);
    }

/* 主横幅 */
.hero {
    padding: 100px 0 120px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    text-align: center;
    position: relative;
    overflow: hidden;
}

    .hero::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 C50,0 50,100 100,100 L100,0 Z" fill="rgba(255,255,255,0.05)"/></svg>');
        background-size: cover;
        opacity: 0.5;
    }

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    gap: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

    .btn:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
    }

.btn-primary {
    background: var(--accent);
    color: var(--dark);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.15);
    color: var(--white);
    backdrop-filter: blur(10px);
}

.btn-accent {
    background: var(--secondary);
    color: var(--white);
}

/* 特性部分 */
.features {
    padding: 80px 0;
    background: var(--white);
}

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

    .section-title h2 {
        font-size: 2rem;
        color: var(--dark);
        margin-bottom: 15px;
        position: relative;
        display: inline-block;
    }

        .section-title h2::after {
            content: "";
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: var(--secondary);
            border-radius: 2px;
        }

    .section-title p {
        color: var(--gray);
        max-width: 700px;
        margin: 20px auto 0;
        font-size: 1.1rem;
    }

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--white);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    text-align: center;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

    .feature-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
        border-color: var(--primary);
    }

.feature-icon {
    width: 80px;
    height: 80px;
    background: rgba(25, 118, 210, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 2rem;
    color: var(--primary);
}

.feature-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--dark);
}

.feature-card p {
    color: var(--gray);
    font-size: 1rem;
}

/* 截图部分 */
.screenshots {
    padding: 80px 0;
    background: var(--light);
}

.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.gallery-item {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    transition: all 0.3s ease;
    background: var(--white);
}

    .gallery-item:hover {
        transform: translateY(-5px);
        box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
    }

.gallery-img {
    width: 100%;
    height: 220px;
    background: linear-gradient(135deg, #e0e0e0 0%, #bdbdbd 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray);
    font-size: 1.2rem;
}

.gallery-caption {
    padding: 20px;
    text-align: center;
}

    .gallery-caption h3 {
        font-size: 1.2rem;
        margin-bottom: 8px;
        color: var(--dark);
    }

    .gallery-caption p {
        color: var(--gray);
        font-size: 0.95rem;
    }

/* 资源部分 */
.resources {
    padding: 80px 0;
    background: var(--white);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.resource-card {
    background: var(--white);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

    .resource-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
        border-color: var(--accent);
    }

.resource-icon {
    width: 70px;
    height: 70px;
    background: rgba(255, 152, 0, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 1.8rem;
    color: var(--accent);
}

.resource-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--dark);
}

.resource-card p {
    color: var(--gray);
    font-size: 1rem;
    margin-bottom: 20px;
}

/* 底部 */
footer {
    background: var(--dark);
    color: var(--white);
    padding: 50px 0 20px;
}

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

.footer-column h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

    .footer-column h3::after {
        content: "";
        position: absolute;
        bottom: 0;
        left: 0;
        width: 40px;
        height: 3px;
        background: var(--accent);
    }

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

    .footer-column ul li {
        margin-bottom: 12px;
    }

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s;
}

    .footer-column a:hover {
        color: var(--accent);
        padding-left: 5px;
    }

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.8);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    position: relative;
    width: 80%;
    max-width: 900px;
    background: #fff;
    border-radius: 8px;
    padding: 20px;
}

    .modal-content video {
        width: 100%;
        border-radius: 5px;
    }

.close {
    position: absolute;
    top: 10px;
    right: 20px;
    color: #fff;
    font-size: 30px;
    cursor: pointer;
    z-index: 1001;
}

/* 登录注册按钮样式 */
.auth-buttons {
    margin-left: 15px;
    display: flex;
    gap: 10px;
}

.btn-login, .btn-register {
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 5px;
}

.btn-login {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-register {
    background: var(--accent);
    color: var(--dark);
    border: 1px solid var(--accent);
}

.btn-login:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-register:hover {
    background: #ffb300;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 193, 7, 0.3);
}
/* 确保图片显示 */
video[poster] {
    object-fit: cover;
    background-color: #000;
}

/* 备用封面方案 */
.video-container {
    position: relative;
}

.video-poster-fallback {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    display: none; /* 默认隐藏，JS控制显示 */
}

/* 视频模态框关闭按钮 */
.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 40px;
    height: 40px;
    background: rgba(0, 0, 0, 0.7);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

    .modal-close:hover {
        background: rgba(0, 0, 0, 0.9);
        transform: rotate(90deg);
    }

/* 视频容器相对定位 */
.modal-content {
    position: relative;
    width: 80%;
    max-width: 900px;
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
}

    /* 视频样式优化 */
    .modal-content video {
        width: 100%;
        display: block;
        outline: none;
    }