/* 全局字体平滑 */
body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 导航栏样式 */
.header-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.nav-link {
    color: #334155; /* slate-700 */
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #1e40af; /* brand-primary */
}

/* 移动端导航动画 */
.mobile-nav {
    transition: max-height 0.3s ease-in-out;
    overflow: hidden;
}

/* 首屏英雄区背景 */
.hero-section {
    background: linear-gradient(135deg, #1e40af 0%, #0f172a 100%);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

/* 按钮脉冲动画 */
.pulse-btn {
    animation: pulse-animation 2s infinite;
}

@keyframes pulse-animation {
    0% {
        box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.7);
    }
    70% {
        box-shadow: 0 0 0 15px rgba(245, 158, 11, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(245, 158, 11, 0);
    }
}

/* 机型卡片 */
.device-card {
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background: white;
}

.device-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* 流程步骤响应处理 */
.step-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 2rem;
}

@media (min-width: 768px) {
    .step-item {
        margin-bottom: 0;
    }
}

/* FAQ折叠动画 */
.faq-btn i {
    transition: transform 0.3s ease;
}

.faq-btn.active i {
    transform: rotate(180deg);
}