:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --dark-color: #121826;
    --light-color: #f8f9fa;
    --success-color: #198754;
    --gradient-primary: linear-gradient(135deg, #0d6efd 0%, #0b5ed7 100%);
    --gradient-dark: linear-gradient(135deg, #121826 0%, #1e293b 100%);
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

.bg-gradient-dark {
    background: var(--gradient-dark);
}

.bg-gradient-primary {
    background: var(--gradient-primary);
}

.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800" opacity="0.05"><path d="M0 0h1200v800H0z" fill="none"/><g fill="%23ffffff"><circle cx="200" cy="100" r="20"/><circle cx="800" cy="300" r="15"/><circle cx="400" cy="500" r="25"/><circle cx="1000" cy="600" r="18"/><circle cx="600" cy="200" r="22"/></g></svg>');
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #fff 0%, #a5d8ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
}

.btn-xl {
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    transition: all 0.3s ease;
    border: none;
    flex: 1;
    min-width: 240px;
    max-width: 280px;
    margin: 0.5rem;
}

.btn-primary {
    background: var(--gradient-primary);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(13, 110, 253, 0.3);
}

.btn-outline-light {
    border: 2px solid rgba(255, 255, 255, 0.2);
    background: transparent;
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-3px);
}

.feature-card {
    background: white;
    border-radius: 20px;
    padding: 2.5rem 2rem;
    height: 100%;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

.feature-icon {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: white;
}

.icon-security {
    background: linear-gradient(135deg, #198754 0%, #157347 100%);
}

.icon-speed {
    background: linear-gradient(135deg, #fd7e14 0%, #e8590c 100%);
}

.icon-global {
    background: linear-gradient(135deg, #0dcaf0 0%, #0aa2c0 100%);
}

.icon-support {
    background: linear-gradient(135deg, #6f42c1 0%, #5a32a3 100%);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--dark-color) 0%, #2d3748 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--secondary-color);
    max-width: 700px;
    margin: 0 auto 3rem;
}

.platform-stats {
    background: var(--gradient-dark);
    border-radius: 20px;
    padding: 3rem;
    margin: 4rem 0;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: white;
    line-height: 1;
}

.stat-label {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.1rem;
    margin-top: 0.5rem;
}

.download-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 30px;
    padding: 4rem 3rem;
    position: relative;
    overflow: hidden;
}

.download-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 200%;
    background: radial-gradient(circle, rgba(13, 110, 253, 0.1) 0%, transparent 70%);
}

.app-info {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    margin-top: 1.5rem;
}

.app-info-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.app-info-text {
    color: var(--secondary-color);
    margin-bottom: 0;
}

.footer {
    background: var(--dark-color);
    color: rgba(255, 255, 255, 0.7);
    padding: 4rem 0 2rem;
}

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

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

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .platform-stats {
        padding: 2rem;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .btn-xl {
        padding: 0.9rem 1.2rem;
        font-size: 1rem;
        min-width: 200px;
        max-width: 250px;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .btn-xl {
        padding: 0.8rem 1rem;
        font-size: 0.95rem;
        min-width: 100%;
        max-width: 100%;
        margin: 0.25rem 0;
    }
    
    .download-section {
        padding: 2rem 1.5rem;
    }
    
    .button-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .button-row {
        flex-direction: column;
        align-items: stretch;
    }
}

@media (max-width: 992px) {
    .footer .col-lg-4, 
    .footer .col-lg-2 {
        margin-bottom: 2rem;
    }
}

@media (max-width: 768px) {
    .footer {
        padding: 3rem 0 1.5rem;
        text-align: center;
    }
    
    .footer .row {
        justify-content: center;
    }
    
    .footer-links {
        align-items: center;
    }
    
    .footer .d-flex {
        justify-content: center;
    }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

.button-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
    width: 100%;
}

.button-row {
    display: flex;
    justify-content: center;
    gap: 1rem;
    width: 100%;
    max-width: 900px;
}

/* 移除animate-on-scroll动画样式，直接显示所有内容 */
.feature-card,
.platform-stats,
.card,
.download-section,
.animate-on-scroll {
    opacity: 1 !important;
    transform: translateY(0) !important;
    transition: none !important;
}

/* 移除动画类 */
.animate-on-scroll.animated {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

/* 移除滚动动画相关CSS */
.animate-on-scroll {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

/* 按钮点击效果改为纯CSS实现 */
.btn:active {
    transform: translateY(-1px) !important;
}

@media (max-width: 1200px) {
    .button-row {
        max-width: 800px;
    }
}

@media (max-width: 992px) {
    .button-row {
        max-width: 700px;
    }
}

@media (max-width: 768px) {
    .button-row {
        max-width: 500px;
    }
}

@media (max-width: 576px) {
    .button-row {
        max-width: 100%;
        flex-direction: column;
    }
}