@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

body {
    font-family: 'Inter', sans-serif;
    padding-bottom: 80px;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a3e 50%, #2d1b69 100%);
    color: #ffffff;
    position: relative;
    overflow-x: hidden;
}

.gradient-text {
    background: linear-gradient(135deg, #3b82f6, #00d9ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.section-content {
    display: none;
}

.section-content.active {
    display: block;
}

/* 响应式容器 */
.responsive-container {
    width: 100%;
    max-width: 100%;
    padding: 0 1rem;
    margin: 0 auto;
}

.responsive-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: 1fr;
}

.responsive-flex {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.responsive-text {
    font-size: 0.875rem;
    line-height: 1.5;
}

.responsive-title {
    font-size: 1.5rem;
    line-height: 1.3;
    text-align: center;
}

.responsive-subtitle {
    font-size: 1rem;
    line-height: 1.4;
    text-align: center;
}

.responsive-button {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    text-align: center;
    min-height: 44px;
    min-width: 44px;
}

.responsive-card {
    width: 100%;
    padding: 1rem;
    margin-bottom: 1rem;
}

@media (min-width: 768px) {
    .responsive-container {
        padding: 0 2rem;
        max-width: 1200px;
    }
    
    .responsive-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .responsive-flex {
        flex-direction: row;
        gap: 1.5rem;
    }
    
    .responsive-text {
        font-size: 1rem;
    }
    
    .responsive-title {
        font-size: 2.5rem;
    }
    
    .responsive-subtitle {
        font-size: 1.25rem;
    }
    
    .responsive-button {
        width: auto;
        min-width: 120px;
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
    
    .responsive-card {
        padding: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .responsive-container {
        padding: 0 3rem;
        max-width: 1400px;
    }
    
    .responsive-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }
    
    .responsive-flex {
        gap: 2rem;
    }
    
    .responsive-title {
        font-size: 3.5rem;
    }
    
    .responsive-subtitle {
        font-size: 1.5rem;
    }
    
    .responsive-button {
        padding: 1rem 2rem;
        font-size: 1.125rem;
    }
    
    .responsive-card {
        padding: 2rem;
    }
}