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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    background-size: 400% 400%;
    animation: gradientShift 8s ease infinite;
    min-height: 100vh;
    color: #333;
    overflow-x: hidden;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

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

.header {
    text-align: center;
    padding: 80px 0 60px;
    color: white;
    position: relative;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translateX(-50%) scale(1); opacity: 0.3; }
    50% { transform: translateX(-50%) scale(1.2); opacity: 0.1; }
}

.header h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 25px;
    text-shadow: 0 4px 20px rgba(0,0,0,0.4);
    background: linear-gradient(45deg, #fff, #f0f8ff, #fff);
    background-size: 200% 200%;
    animation: textShimmer 3s ease-in-out infinite;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.header h1 .logo {
    width: 50px;
    height: 50px;
    object-fit: contain;
    filter: drop-shadow(0 2px 10px rgba(0,0,0,0.3));
    border-radius: 8px;
}

@keyframes textShimmer {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.header p {
    font-size: 1.4rem;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.7;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    position: relative;
    z-index: 1;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 60px 0;
}

.feature-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(15px);
    border-radius: 25px;
    padding: 45px 35px;
    text-align: center;
    box-shadow: 0 25px 50px rgba(0,0,0,0.1);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.feature-card:hover::before {
    left: 100%;
}

.feature-card:hover {
    transform: translateY(-15px) scale(1.02);
    box-shadow: 0 35px 70px rgba(0,0,0,0.2);
    border-color: rgba(255, 255, 255, 0.4);
}

.feature-icon {
    font-size: 3.5rem;
    margin-bottom: 25px;
    display: inline-block;
    animation: iconBounce 2s ease-in-out infinite;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.1));
}

@keyframes iconBounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.feature-card:hover .feature-icon {
    animation: iconSpin 0.6s ease-in-out;
}

@keyframes iconSpin {
    0% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(180deg); }
    100% { transform: translateY(0) rotate(360deg); }
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #333;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

.download-section {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border-radius: 30px;
    padding: 60px;
    margin: 80px 0;
    text-align: center;
    box-shadow: 0 30px 60px rgba(0,0,0,0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
}

.download-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg, transparent, rgba(102, 126, 234, 0.1), transparent);
    animation: rotateGradient 10s linear infinite;
}

@keyframes rotateGradient {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.download-section > * {
    position: relative;
    z-index: 1;
}

.download-section h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: #333;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    margin-top: 40px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 25px 50px;
    border-radius: 20px;
    text-decoration: none;
    font-size: 1.3rem;
    font-weight: 700;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    min-width: 250px;
    justify-content: center;
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.6s;
}

.download-btn:hover::before {
    left: 100%;
}

.download-btn.windows {
    background: linear-gradient(135deg, #0078d4, #106ebe, #0099ff);
    background-size: 200% 200%;
    animation: gradientMove 3s ease infinite;
    color: white;
    box-shadow: 0 8px 25px rgba(0, 120, 212, 0.3);
}

.download-btn.macos {
    background: linear-gradient(135deg, #1a1a1a, #333333, #555555);
    background-size: 200% 200%;
    animation: gradientMove 3s ease infinite;
    color: white;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

@keyframes gradientMove {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.download-btn:hover {
    transform: translateY(-8px) scale(1.05);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.download-btn.windows:hover {
    box-shadow: 0 20px 40px rgba(0, 120, 212, 0.4);
    border-color: rgba(255, 255, 255, 0.3);
}

.download-btn.macos:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    border-color: rgba(255, 255, 255, 0.3);
}

.download-btn .icon {
    font-size: 1.5rem;
}

.version-info {
    margin-top: 35px;
    color: #666;
    padding: 25px;
    background: rgba(102, 126, 234, 0.05);
    border-radius: 15px;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.version-info p {
    margin: 8px 0;
    font-weight: 500;
}

.footer {
    text-align: center;
    padding: 50px 0;
    color: rgba(255, 255, 255, 0.9);
    background: rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 25px 25px 0 0;
    margin-top: 40px;
}

.footer p {
    margin-bottom: 10px;
}

.footer a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 2.5rem;
    }

    .header p {
        font-size: 1.1rem;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .download-btn {
        width: 100%;
        max-width: 300px;
    }

    .features {
        grid-template-columns: 1fr;
    }
}

.floating-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.shape {
    position: absolute;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite;
    backdrop-filter: blur(2px);
}

.shape:nth-child(1) {
    width: 120px;
    height: 120px;
    top: 15%;
    left: 8%;
    animation-delay: 0s;
    background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0.05) 100%);
}

.shape:nth-child(2) {
    width: 180px;
    height: 180px;
    top: 55%;
    right: 8%;
    animation-delay: 2.5s;
    background: radial-gradient(circle, rgba(255,255,255,0.12) 0%, rgba(255,255,255,0.03) 100%);
}

.shape:nth-child(3) {
    width: 90px;
    height: 90px;
    bottom: 15%;
    left: 15%;
    animation-delay: 5s;
    background: radial-gradient(circle, rgba(255,255,255,0.18) 0%, rgba(255,255,255,0.06) 100%);
}

.shape:nth-child(4) {
    width: 60px;
    height: 60px;
    top: 30%;
    right: 25%;
    animation-delay: 1.5s;
    background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0.08) 100%);
}

.shape:nth-child(5) {
    width: 140px;
    height: 140px;
    bottom: 40%;
    right: 30%;
    animation-delay: 3.5s;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.04) 100%);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg) scale(1);
        opacity: 0.6;
    }
    33% {
        transform: translateY(-25px) rotate(120deg) scale(1.1);
        opacity: 0.8;
    }
    66% {
        transform: translateY(-15px) rotate(240deg) scale(0.9);
        opacity: 0.4;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.feature-card {
    opacity: 0;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}