/* --- 全局样式和变量 --- */
:root {
    --primary-gradient: linear-gradient(90deg, #4facfe 0%, #00f2fe 100%);
    --dark-bg: #121212;
    --dark-surface: #1e1e1e;
    --light-text: #e0e0e0;
    --secondary-text: #a0a0a0;
    --container-width: 1100px;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.8;
    margin: 0;
    padding: 0;
    background-color: var(--dark-bg);
    color: var(--secondary-text);
}

.container {
    max-width: var(--container-width);
    margin: auto;
    overflow: hidden;
    padding: 0 2rem;
}

h1, h2, h3, h4 {
    color: var(--light-text);
    font-weight: 600;
}

section {
    padding: 6rem 0;
    border-bottom: 1px solid #2a2a2a;
}
section:last-of-type {
    border-bottom: none;
}

/* --- 顶部横幅 (Hero Section) --- */
.hero-section {
    background: linear-gradient(rgba(18, 18, 18, 0.8), rgba(18, 18, 18, 0.8)), url(hero-background.jpg) no-repeat center center/cover;
    text-align: center;
    padding: 8rem 0;
}

.main-headline {
    font-size: 4.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
    margin-bottom: 1rem;
}

.hero-section p {
    font-size: 1.25rem;
    max-width: 700px;
    margin: auto;
    color: var(--secondary-text);
}

/* --- 效果展示区 (Showcase) --- */
.showcase-item {
    display: flex;
    align-items: center;
    gap: 5rem; /* 增加间距 */
    margin-bottom: 6rem; /* 增加每个项目下方的边距 */
}
.showcase-item:last-child {
    margin-bottom: 0;
}
.showcase-item.reverse {
    flex-direction: row-reverse;
}
.showcase-item img {
    width: 50%;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.showcase-item img:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 40px rgba(79, 172, 254, 0.3);
}
.showcase-item .text-content {
    width: 50%;
}

/* --- 服务流程区 (How It Works) --- */
.how-it-works-section {
    background-color: var(--dark-surface);
    text-align: center;
}
.steps {
    display: flex;
    justify-content: space-around;
    gap: 2rem;
    margin-top: 3rem;
}
.step {
    flex: 1;
    padding: 2rem;
}
.step h3 {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

/* --- 价格方案区 (Pricing) --- */
.pricing-section {
  display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    padding-top: 30px; /* 新增：为 'Most Popular' 标签增加顶部空间 */
}
.pricing-plan {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 2.5rem;
    text-align: center;
    flex: 1;
    max-width: 380px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}
.pricing-plan:hover {
    transform: translateY(-15px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}
.pricing-plan.expert {
    border-color: #4facfe;
}
.pricing-plan .price {
    font-size: 3rem;
    font-weight: 700;
    color: var(--light-text);
    margin: 1.5rem 0;
}
.pricing-plan ul {
    list-style: none;
    padding: 0;
    margin: 2rem 0;
}
.pricing-plan ul li {
    margin-bottom: 1rem;
}
.badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-gradient);
    color: #fff;
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}
.cta-button {
    display: inline-block;
    background: var(--primary-gradient);
    color: #fff;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
}
.cta-button:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(79, 172, 254, 0.4);
}

/* --- 常见问题区 (FAQ) --- */
.faq-section h2 { text-align: center; margin-bottom: 3rem; }
.faq-item {
    background: var(--dark-surface);
    padding: 1.5rem 2rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    border-left: 4px solid #4facfe;
}

/* --- 页脚区 (Footer) --- */
footer {
    background-color: var(--dark-surface);
    text-align: center;
    padding: 3rem 0;
}

/* --- 滚动动画 --- */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    transition-delay: 0.2s;
}
.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- 响应式设计 (手机端) --- */
@media (max-width: 768px) {
    .main-headline { font-size: 2.8rem; }
    .hero-section p { font-size: 1rem; }
    
    .showcase-item, .showcase-item.reverse {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }
    .showcase-item img, .showcase-item .text-content {
        width: 100%;
    }
    
    .steps, .pricing-section {
        flex-direction: column;
        align-items: center;
    }
}