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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #0f1419 0%, #1a2332 50%, #0f1419 100%);
    min-height: 100vh;
    overflow: hidden;
    position: relative;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    position: relative;
    z-index: 10;
}

/* 3D几何图形 */
.geometric-shape {
    width: 120px;
    height: 120px;
    margin-bottom: 40px;
    perspective: 1000px;
    animation: float 6s ease-in-out infinite;
}

.shape-inner {
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, #00ff88, #00cc6a);
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
    transform-style: preserve-3d;
    animation: rotate3d 8s linear infinite;
    box-shadow: 0 20px 40px rgba(0, 255, 136, 0.3);
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes rotate3d {
    0% { transform: rotateY(0deg) rotateX(0deg); }
    25% { transform: rotateY(90deg) rotateX(15deg); }
    50% { transform: rotateY(180deg) rotateX(0deg); }
    75% { transform: rotateY(270deg) rotateX(-15deg); }
    100% { transform: rotateY(360deg) rotateX(0deg); }
}

/* OT Logo */
.ot-logo {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    perspective: 1000px;
}

.ot-letter {
    font-size: 6rem;
    font-weight: 900;
    color: #00ff88;
    text-shadow:
        0 0 20px rgba(0, 255, 136, 0.8),
        0 0 40px rgba(0, 255, 136, 0.6),
        0 0 60px rgba(0, 255, 136, 0.4);
    animation: letterGlow 3s ease-in-out infinite alternate;
    transition: all 0.3s ease;
    cursor: pointer;
    transform-style: preserve-3d;
}

.ot-letter:nth-child(1) {
    animation-delay: 0s;
}

.ot-letter:nth-child(2) {
    animation-delay: 0.5s;
}

.ot-letter:hover {
    transform: rotateY(15deg) scale(1.1);
    color: #ffffff;
    text-shadow:
        0 0 30px rgba(255, 255, 255, 0.8),
        0 0 50px rgba(0, 255, 136, 0.8),
        0 0 70px rgba(0, 255, 136, 0.6);
}

@keyframes letterGlow {
    from {
        text-shadow:
            0 0 20px rgba(0, 255, 136, 0.8),
            0 0 40px rgba(0, 255, 136, 0.6),
            0 0 60px rgba(0, 255, 136, 0.4);
    }
    to {
        text-shadow:
            0 0 30px rgba(0, 255, 136, 1),
            0 0 50px rgba(0, 255, 136, 0.8),
            0 0 80px rgba(0, 255, 136, 0.6);
    }
}

/* 主标题 */
.main-title {
    font-size: 2.5rem;
    font-weight: 300;
    color: #ffffff;
    letter-spacing: 0.3rem;
    margin-bottom: 20px;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
    opacity: 0.9;
}

@keyframes glow {
    from { text-shadow: 0 0 30px rgba(255, 255, 255, 0.5); }
    to { text-shadow: 0 0 50px rgba(0, 255, 136, 0.8); }
}

/* 副标题 */
.subtitle {
    color: #888;
    font-size: 1.2rem;
    margin-bottom: 40px;
    letter-spacing: 0.2rem;
}

/* 主下载按钮 */
.main-download {
    background: linear-gradient(45deg, #00ff88, #00cc6a);
    color: #000;
    border: none;
    padding: 15px 60px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 50px;
    cursor: pointer;
    margin-bottom: 30px;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 255, 136, 0.4);
    display: flex;
    align-items: center;
    gap: 10px;
}

.main-download:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 255, 136, 0.6);
    background: linear-gradient(45deg, #00cc6a, #00ff88);
}

.download-icon {
    font-size: 1.5rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-5px); }
    60% { transform: translateY(-3px); }
}

/* 按钮组 */
.button-group {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    justify-content: center;
}

.action-btn {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 12px 25px;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.action-btn:hover {
    background: rgba(0, 255, 136, 0.2);
    border-color: #00ff88;
    transform: translateY(-2px);
}

/* 底部按钮 */
.bottom-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.secondary-btn {
    background: transparent;
    color: #888;
    border: 1px solid rgba(136, 136, 136, 0.3);
    padding: 10px 20px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
}

.secondary-btn:hover {
    color: #00ff88;
    border-color: #00ff88;
    background: rgba(0, 255, 136, 0.1);
}

.btn-icon {
    font-size: 1rem;
}

/* 背景粒子效果 */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: rgba(0, 255, 136, 0.6);
    border-radius: 50%;
    animation: particle-float 10s linear infinite;
}

@keyframes particle-float {
    0% {
        transform: translateY(100vh) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100px) translateX(100px);
        opacity: 0;
    }
}

/* 特性介绍部分 */
.features-section {
    display: flex;
    gap: 30px;
    margin-top: 40px;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 600px;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    border: 1px solid rgba(0, 255, 136, 0.2);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    min-width: 120px;
}

.feature-item:hover {
    background: rgba(0, 255, 136, 0.1);
    border-color: #00ff88;
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 255, 136, 0.3);
}

.feature-icon {
    font-size: 1.5rem;
    filter: drop-shadow(0 0 10px rgba(0, 255, 136, 0.5));
}

.feature-text {
    color: #fff;
    font-size: 0.9rem;
    font-weight: 500;
    text-align: center;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .ot-logo {
        gap: 5px;
        margin-bottom: 20px;
    }
    
    .ot-letter {
        font-size: 4rem;
    }
    
    .main-title {
        font-size: 2rem;
        letter-spacing: 0.2rem;
    }
    
    .geometric-shape {
        width: 80px;
        height: 80px;
        margin-bottom: 30px;
    }
    
    .button-group {
        flex-direction: column;
        align-items: center;
    }
    
    .bottom-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .action-btn, .secondary-btn {
        width: 200px;
        justify-content: center;
    }
    
    .features-section {
        gap: 15px;
        margin-top: 30px;
    }
    
    .feature-item {
        min-width: 100px;
        padding: 12px;
    }
}

@media (max-width: 480px) {
    .ot-letter {
        font-size: 3rem;
    }
    
    .main-title {
        font-size: 1.5rem;
    }
    
    .main-download {
        padding: 12px 40px;
        font-size: 1rem;
    }
    
    .features-section {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }
    
    .feature-item {
        width: 150px;
    }
}