:root {
    --primary: rgb(17, 153, 142);
    --secondary: rgb(56, 239, 125);
    --text-color: #000000;
    --text-muted: rgba(0, 0, 0, 0.7);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'KaiTi', '楷体', 'STKaiti', serif;
    background: linear-gradient(to right, rgb(17, 153, 142), rgb(56, 239, 125));
    background-attachment: fixed;
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: var(--text-color);
}

ul {
    list-style: none;
}

/* 新拟态核心类 */
.neu-box {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 
        8px 8px 16px rgba(0, 0, 0, 0.15),
        -8px -8px 16px rgba(255, 255, 255, 0.3),
        inset 1px 1px 2px rgba(255, 255, 255, 0.5),
        inset -1px -1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 20px;
}

.neu-btn {
    display: inline-block;
    padding: 12px 30px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 
        6px 6px 12px rgba(0, 0, 0, 0.15),
        -6px -6px 12px rgba(255, 255, 255, 0.3);
    border-radius: 50px;
    color: #000;
    font-weight: bold;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
}

.neu-btn:hover {
    box-shadow: 
        inset 6px 6px 12px rgba(0, 0, 0, 0.15),
        inset -6px -6px 12px rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(2px);
}

.neu-btn-primary {
    background: linear-gradient(135deg, rgba(255,255,255,0.4), rgba(255,255,255,0.1));
    color: #000;
    font-size: 1.2rem;
}
.neu-btn-primary:hover {
    color: #000;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
header {
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 30px;
    border-radius: 50px;
}
.logo {
    font-size: 1.8rem;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}
.nav-links {
    display: flex;
    gap: 30px;
}
.nav-links a {
    font-size: 1.1rem;
    position: relative;
    padding: 5px 10px;
    transition: 0.3s;
}
.nav-links a:hover {
    text-shadow: 0 0 10px rgba(255,255,255,0.8);
}
.nav-btn {
    padding: 8px 25px;
    font-size: 1rem;
}

/* Hero首屏 */
.hero {
    text-align: center;
    padding: 100px 0;
}
.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    text-shadow: 3px 3px 6px rgba(0,0,0,0.2);
}
.hero p {
    font-size: 1.5rem;
    margin-bottom: 40px;
    color: rgba(0, 0, 0, 0.9);
}
.hero-tags {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 50px;
}
.hero-tag {
    padding: 8px 20px;
    border-radius: 30px;
    font-size: 1.1rem;
}

/* 区域通用标题 */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}
section {
    padding: 80px 0;
}

/* 功能特性 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}
.feature-card {
    padding: 40px 30px;
    text-align: center;
    transition: transform 0.3s ease;
}
.feature-card:hover {
    transform: translateY(-10px);
}
.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}
.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}
.feature-card p {
    color: var(--text-muted);
}

/* 订阅套餐 (复刻图1) */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
    align-items: center;
}
.pricing-card {
    padding: 40px;
    text-align: center;
    position: relative;
    display: flex;
    flex-direction: column;
    height: 100%;
}
.pricing-card.highlight {
    transform: scale(1.05);
    background: rgba(255, 255, 255, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.5);
}
.pricing-title {
    font-size: 1.6rem;
    margin-bottom: 20px;
}
.pricing-price {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 30px;
    color: #000;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}
.pricing-price span {
    font-size: 1.2rem;
    font-weight: normal;
    color: rgba(0,0,0,0.8);
}
.pricing-features {
    text-align: left;
    margin-bottom: 40px;
    flex-grow: 1;
}
.pricing-features li {
    margin-bottom: 15px;
    position: relative;
    padding-left: 30px;
}
.pricing-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 0;
    color: #000;
    font-weight: bold;
}
.pricing-btn {
    width: 100%;
    margin-top: auto;
}

/* 用户评价 */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}
.review-card {
    padding: 30px;
    font-style: italic;
}
.review-author {
    margin-top: 15px;
    font-weight: bold;
    text-align: right;
    font-style: normal;
}

/* 知识科普 (SEO文章列表) */
.articles-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}
.article-item {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.article-item h4 {
    font-size: 1.2rem;
}
.article-item a {
    margin-top: auto;
    align-self: flex-start;
    border-bottom: 1px solid rgba(255,255,255,0.5);
    padding-bottom: 2px;
}
.article-item a:hover {
    border-color: #fff;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.faq-item {
    padding: 20px 30px;
    cursor: pointer;
}
.faq-question {
    font-size: 1.3rem;
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.faq-answer {
    margin-top: 15px;
    display: none;
    color: rgba(0, 0, 0, 0.9);
}
.faq-item.active .faq-answer {
    display: block;
}

/* 底部版权 */
footer {
    text-align: center;
    padding: 40px 0;
    margin-top: 50px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .hero h1 {
        font-size: 2.5rem;
    }
    .pricing-card.highlight {
        transform: scale(1);
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
}