:root {
    --bg-dark: #0C0E1A;
    --bg-dark-secondary: #161A2E;
    --gold-primary: #FFD700;
    --gold-secondary: #FFC107;
    --purple-primary: #8A2BE2;
    --purple-secondary: #9370DB;
    --neon-blue: #4D7CFE;
    --neon-pink: #FF00FF;
    --text-white: #FFFFFF;
    --text-light: #E0E0E0;
    --border-radius: 10px;
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-white);
    line-height: 1.6;
    background-image: radial-gradient(circle at 10% 20%, rgba(90, 92, 106, 0.1) 0%, rgba(32, 45, 58, 0.01) 81.3%);
}

header {
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 20px rgba(138, 43, 226, 0.2);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo img {
    height: 50px;
    filter: drop-shadow(0 0 5px var(--purple-primary));
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-white);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-speed);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(to right, var(--neon-blue), var(--purple-primary));
    transition: width var(--transition-speed);
}

.nav-link:hover {
    color: var(--neon-blue);
}

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

.register-btn {
    background: linear-gradient(45deg, var(--gold-primary), var(--gold-secondary));
    color: #000;
    padding: 0.5rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: all var(--transition-speed);
    border: none;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

.register-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(255, 215, 0, 0.7);
}

.banner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    gap: 2rem;
}

.banner-content {
    flex: 1;
}

.banner-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, var(--gold-primary), var(--purple-primary), var(--neon-blue));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 700;
    text-shadow: 0 0 30px rgba(138, 43, 226, 0.1);
}

.banner-content p {
    font-size: 1.3rem;
    margin-bottom: 2.5rem;
    color: var(--text-light);
}

.cta-btn {
    background: linear-gradient(45deg, var(--purple-primary), var(--neon-blue));
    color: var(--text-white);
    padding: 0.85rem 2.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    transition: all var(--transition-speed);
    border: none;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(138, 43, 226, 0.4);
}

.cta-btn:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 10px 25px rgba(138, 43, 226, 0.6);
}

.banner-image {
    flex: 1;
    display: flex;
    justify-content: center;
    position: relative;
}

.banner-image img {
    max-width: 100%;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
    transition: transform 0.5s ease;
}

.banner-image:hover img {
    transform: translateY(-10px);
}

.promo-bar {
    background: linear-gradient(45deg, var(--purple-primary), var(--neon-blue));
    color: var(--text-white);
    text-align: center;
    padding: 1rem 0;
    font-weight: 500;
    box-shadow: 0 5px 15px rgba(138, 43, 226, 0.3);
    position: relative;
    overflow: hidden;
}

.promo-bar::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(255, 255, 255, 0.1) 10px,
        rgba(255, 255, 255, 0.1) 20px
    );
    animation: promo-animation 20s linear infinite;
    opacity: 0.3;
}

@keyframes promo-animation {
    0% {
        transform: translateX(0) translateY(0);
    }
    100% {
        transform: translateX(50px) translateY(50px);
    }
}

.activities {
    padding: 6rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.activities h2 {
    text-align: center;
    color: var(--gold-primary);
    margin-bottom: 3rem;
    font-size: 2.5rem;
    position: relative;
}

.activities h2::after {
    content: '';
    display: block;
    width: 120px;
    height: 4px;
    background: linear-gradient(to right, var(--gold-primary), var(--purple-primary), var(--neon-blue));
    margin: 0.8rem auto 0;
    border-radius: 50px;
}

.activity-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.activity-card {
    background: var(--bg-dark-secondary);
    border: 2px solid transparent;
    border-image: linear-gradient(to bottom right, var(--gold-primary), var(--purple-primary));
    border-image-slice: 1;
    border-radius: var(--border-radius);
    padding: 1.8rem;
    transition: all var(--transition-speed);
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.activity-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, transparent 50%, var(--gold-primary) 50%);
    border-bottom-left-radius: 15px;
    transition: all var(--transition-speed);
}

.activity-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4), 0 0 20px rgba(138, 43, 226, 0.3);
    border-image: linear-gradient(to bottom right, var(--neon-blue), var(--purple-primary));
    border-image-slice: 1;
}

.activity-card:hover::before {
    background: linear-gradient(135deg, transparent 50%, var(--neon-blue) 50%);
}

.activity-content h3 {
    color: var(--gold-primary);
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    border-bottom: 1px solid rgba(255, 215, 0, 0.2);
    padding-bottom: 0.7rem;
    transition: color var(--transition-speed);
}

.activity-card:hover .activity-content h3 {
    color: var(--neon-blue);
}

.activity-description {
    margin-top: 1rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.games {
    padding: 6rem 2rem 4rem;
    background-color: var(--bg-dark-secondary);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.games::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(77, 124, 254, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.games h2 {
    color: var(--gold-primary);
    margin-bottom: 3rem;
    font-size: 2.5rem;
    position: relative;
    z-index: 1;
}

.games h2::after {
    content: '';
    display: block;
    width: 120px;
    height: 4px;
    background: linear-gradient(to right, var(--gold-primary), var(--purple-primary), var(--neon-blue));
    margin: 0.8rem auto 0;
    border-radius: 50px;
}

.games-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.game-card {
    background-color: var(--bg-dark);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: all var(--transition-speed);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
    position: relative;
}

.game-card:hover {
    transform: translateY(-15px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), 0 0 30px rgba(138, 43, 226, 0.3);
}

.game-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.game-card:hover img {
    transform: scale(1.05);
}

.game-card h3 {
    color: var(--gold-primary);
    padding: 1.5rem 1rem 1rem;
    font-size: 1.3rem;
}

.game-btn {
    display: inline-block;
    background: linear-gradient(45deg, var(--purple-primary), var(--neon-blue));
    color: var(--text-white);
    padding: 0.7rem 2rem;
    margin: 0.5rem 0 1.5rem;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-speed);
}

.game-btn:hover {
    background: linear-gradient(45deg, var(--neon-blue), var(--purple-primary));
    box-shadow: 0 0 15px rgba(138, 43, 226, 0.5);
    transform: scale(1.1);
}

.features {
    padding: 6rem 2rem 4rem;
    text-align: center;
    max-width: 1200px;
    margin: 0 auto;
}

.features h2 {
    color: var(--gold-primary);
    margin-bottom: 3rem;
    font-size: 2.5rem;
    position: relative;
}

.features h2::after {
    content: '';
    display: block;
    width: 120px;
    height: 4px;
    background: linear-gradient(to right, var(--gold-primary), var(--purple-primary), var(--neon-blue));
    margin: 0.8rem auto 0;
    border-radius: 50px;
}

.features-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-dark-secondary);
    border-radius: var(--border-radius);
    padding: 2rem 1.5rem;
    transition: all var(--transition-speed);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3), 0 0 15px rgba(138, 43, 226, 0.2);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1.2rem;
}

.feature-card h3 {
    color: var(--gold-primary);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.feature-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

footer {
    background-color: #060814;
    padding: 2rem 0;
    text-align: center;
    margin-top: 2rem;
}

footer p {
    color: var(--text-light);
    font-size: 0.9rem;
    max-width: 800px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .banner {
        flex-direction: column;
        text-align: center;
        padding: 3rem 1.5rem;
    }
    
    .banner-content h1 {
        font-size: 2.5rem;
    }

    .banner-content p {
        font-size: 1.1rem;
    }
    
    .activity-grid,
    .games-container,
    .features-container {
        grid-template-columns: 1fr;
    }

    .nav-links {
        gap: 1rem;
    }

    .register-btn,
    .cta-btn {
        padding: 0.5rem 1rem;
    }
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(138, 43, 226, 0.7);
    }
    70% {
        box-shadow: 0 0 0 15px rgba(138, 43, 226, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(138, 43, 226, 0);
    }
}

/* 响应式导航按钮样式 */
.nav-buttons {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-buttons a {
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 4px;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-block;
    text-align: center;
}

.register-btn {
    background-color: var(--gold-primary);
    color: var(--bg-dark);
    border: none;
    cursor: pointer;
}

.login-btn {
    background-color: var(--purple-primary);
    color: white;
    border: none;
    cursor: pointer;
}

.register-btn:hover, .login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

/* 使标题按钮使用<a>标签样式 */
a.cta-btn {
    display: inline-block;
    text-decoration: none;
    padding: 12px 25px;
    background: linear-gradient(45deg, var(--gold-primary), var(--gold-secondary));
    color: var(--bg-dark);
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 20px;
    text-align: center;
}

a.cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* 默认显示桌面导航 */
@media screen and (min-width: 769px) {
    .desktop-only {
        display: flex;
    }
}

/* 移动设备样式 */
@media screen and (max-width: 768px) {
    .desktop-only {
        display: none; /* 在移动设备上隐藏桌面导航链接 */
    }
    
    .nav-buttons {
        margin-left: auto; /* 使按钮在移动设备上靠右对齐 */
    }
    
    header nav {
        padding: 15px;
    }
    
    .logo img {
        max-width: 120px; /* 在移动设备上缩小logo */
    }
    
    .nav-buttons a {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
}