:root {
    --primary-color: #ff914d;
    --secondary-color: #ffcc99;
    --accent-color: #f77f00;
    --text-color: #333333;
    --light-text-color: #ffffff;
    --bg-light: #ffffff;
    --bg-dark: #2c2c3e;
    
    font-size: 16px;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-light);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 75rem;
    margin: 0 auto;
    padding: 1.25rem;
}

.header {
    text-align: center;
    padding: 5rem 1.25rem 3.75rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--light-text-color);
    position: relative;
    z-index: 1;
    clip-path: polygon(0 0, 100% 0, 100% 90%, 0% 100%);
    box-shadow: 0 0.25rem 1.25rem rgba(0, 0, 0, 0.2);
}

.header h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem); 
    margin-bottom: 0.625rem;
    text-shadow: 0.125rem 0.125rem 0.5rem rgba(0, 0, 0, 0.3);
}

.header p {
    font-size: 1.5rem;
    color: var(--light-text-color);
}

.main-buttons {
    margin-top: 2.5rem;
    display: flex;
    justify-content: center;
    gap: 1.25rem;
}

.btn {
    padding: 0.9375rem 2.5rem;
    border-radius: 3.125rem;
    font-size: 1.2rem;
    font-weight: bold;
    text-decoration: none;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 0.25rem 0.9375rem rgba(0, 0, 0, 0.1);
}

.btn:hover {
    transform: translateY(-0.3125rem);
    box-shadow: 0 0.5rem 1.25rem rgba(0, 0, 0, 0.25);
}

.btn-try {
    background-color: var(--bg-dark);
    color: var(--light-text-color);
}

.btn-login {
    background-color: var(--primary-color);
    color: var(--light-text-color);
}

.btn-login:hover {
    background-color: var(--accent-color);
    background-image: linear-gradient(45deg, var(--accent-color) 0%, #ff8c40 100%);
}

.section {
    padding: 5rem 1.25rem;
    text-align: center;
}

.section h2 {
    font-size: 2.5rem;
    margin-bottom: 3.125rem;
    position: relative;
    display: inline-block;
    color: var(--accent-color);
}

.section h2::after {
    content: '';
    width: 5rem;
    height: 0.25rem;
    background-color: var(--primary-color);
    position: absolute;
    bottom: -0.625rem;
    left: 50%;
    transform: translateX(-50%);
}

.features {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    flex-wrap: wrap;
}

.feature-item {
    background: var(--bg-light);
    border-radius: 1.25rem;
    padding: 1.875rem;
    width: 18.75rem;
    text-align: center;
    border: 0.0625rem solid #e0e0e0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 0.25rem 0.625rem rgba(0, 0, 0, 0.05);
}

.feature-item:hover {
    transform: scale(1.03);
    box-shadow: 0 0.625rem 1.875rem rgba(0, 0, 0, 0.15);
}

.feature-item img {
    width: 6.25rem;
    height: auto;
    display: block;
    margin: 0 auto 1.25rem;
}

.feature-item h3 {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-bottom: 0.625rem;
}

.plans {
    padding: 5rem 1.25rem;
    text-align: center;
    background-color: var(--bg-dark);
    color: var(--light-text-color);
}

.plans h2 {
    color: var(--light-text-color);
}

.plan-grid {
    display: flex;
    justify-content: center;
    gap: 1.875rem;
    flex-wrap: wrap;
}

.plan-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 0.9375rem;
    padding: 1.875rem;
    width: 18.75rem;
    text-align: center;
    border: 0.0625rem solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.plan-card.highlight {
    background: var(--primary-color);
    box-shadow: 0 0.5rem 1.5625rem rgba(0, 0, 0, 0.3);
    transform: scale(1.05);
    color: var(--light-text-color);
}

.plan-card.highlight .plan-price,
.plan-card.highlight .plan-features li {
    color: var(--light-text-color);
}
    
.plan-card:hover {
    transform: translateY(-0.3125rem);
    box-shadow: 0 0.5rem 1.25rem rgba(0, 0, 0, 0.1);
}

.plan-card h3 {
    font-size: 2rem;
    margin-bottom: 0.9375rem;
    color: var(--secondary-color);
}
    
.plan-card.highlight h3 {
    color: var(--light-text-color);
}

.plan-price {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 1.25rem;
}
    
.plan-price span {
    font-size: 1.5rem;
    font-weight: normal;
}

.plan-features {
    list-style: none;
    padding: 0;
    margin-bottom: 1.875rem;
    text-align: left;
}

.plan-features li {
    margin-bottom: 0.625rem;
    color: #ccc;
    display: flex;
    align-items: center;
}

.plan-features li::before {
    content: '✓';
    color: var(--secondary-color);
    margin-right: 0.625rem;
    font-weight: bold;
    font-size: 1.2rem;
}
    
.plan-card.highlight .plan-features li::before {
    color: var(--light-text-color);
}

.plan-btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--light-text-color);
    padding: 0.75rem 1.875rem;
    border-radius: 3.125rem;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s ease;
}
    
.plan-card.highlight .plan-btn {
    background-color: var(--bg-dark);
}

.plan-btn:hover {
    background-color: var(--accent-color);
}

.footer {
    text-align: center;
    padding: 2.5rem;
    border-top: 0.0625rem solid #e0e0e0;
    color: #888888;
}

/* 响应式设计 */
@media (max-width: 48rem) {
    .header h1 {
        font-size: 2.5rem;
    }

    .header p {
        font-size: 1.2rem;
    }

    .main-buttons {
        flex-direction: column;
    }

    .btn {
        width: 80%;
        margin: 0 auto 0.9375rem;
    }

    .features, .plan-grid {
        flex-direction: column;
        align-items: center;
    }
        
    .feature-item, .plan-card {
        width: 90%;
    }
}