:root {
    --primary-color: #ff6b81;
    --primary-hover: #ff4757;
    --text-color: #2f3542;
    --text-light: #747d8c;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --border-color: #dfe4ea;
    --radius: 16px;
    --shadow: 0 8px 20px rgba(0,0,0,0.06);
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--bg-color);
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
}

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

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.text-center {
    text-align: center;
}

.section-title {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 50px;
    color: #2f3542;
    font-weight: 700;
}

.bg-light {
    background-color: var(--bg-light);
}

/* Button */
.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 28px;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    border: 2px solid var(--primary-color);
    cursor: pointer;
}

.btn:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    color: white;
    box-shadow: 0 4px 12px rgba(255, 107, 129, 0.3);
}

.btn-large {
    padding: 16px 45px;
    font-size: 1.1rem;
}

.btn-small {
    padding: 8px 24px;
    font-size: 0.95rem;
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Navbar */
.navbar {
    padding: 15px 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    margin: 0;
    padding: 0;
}

.nav-menu a {
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

.nav-menu a:hover {
    color: var(--primary-color);
}

/* Hero Section (2-Column) */
.hero {
    padding: 80px 0 100px;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    overflow: hidden;
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.hero-content {
    flex: 1;
    max-width: 550px;
}

.hero-content h1 {
    font-size: 3.2rem;
    margin-bottom: 25px;
    line-height: 1.25;
    font-weight: 800;
    color: #1a1a1a;
}

.brand-highlight {
    color: var(--primary-color);
}

.hero-content .subtitle {
    font-size: 1.15rem;
    color: var(--text-light);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-visual {
    flex: 1;
    position: relative;
    height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Animations */
.circle-decoration {
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(255, 107, 129, 0.08) 0%, rgba(255, 107, 129, 0.01) 100%);
    border: 1px dashed rgba(255, 107, 129, 0.3);
    position: absolute;
    animation: rotate 20s linear infinite;
}

.floating-card {
    position: absolute;
    background: white;
    padding: 15px 20px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    display: flex;
    align-items: center;
    gap: 15px;
    animation: float 4s ease-in-out infinite;
    z-index: 2;
    border: 1px solid rgba(0,0,0,0.03);
    min-width: 200px;
}

.floating-card .card-icon {
    font-size: 1.8rem;
}

.floating-card strong {
    display: block;
    font-size: 0.95rem;
    color: var(--text-color);
    margin-bottom: 2px;
}

.floating-card p {
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: bold;
    margin: 0;
}

.card-1 {
    top: 15%;
    left: 5%;
    animation-delay: 0s;
}

.card-2 {
    bottom: 20%;
    left: 10%;
    animation-delay: 1.5s;
}

.card-3 {
    top: 40%;
    right: 5%;
    animation-delay: 0.7s;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0px); }
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Grid Layouts */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

/* Sections */
section {
    padding: 100px 0;
}

.card {
    background: white;
    padding: 40px 35px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.03);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

/* Features */
.features .icon {
    font-size: 3.5rem;
    margin-bottom: 20px;
}

.features h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.features p {
    color: var(--text-light);
}

/* Support */
.support-card h3 {
    margin-bottom: 20px;
    color: var(--text-color);
    font-size: 1.4rem;
}

.support-card p {
    color: var(--text-light);
    font-size: 1.05rem;
}

/* Pricing */
.pricing-card {
    text-align: center;
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card.popular {
    border-color: var(--primary-color);
    transform: scale(1.05);
    z-index: 10;
}

.pricing-card.popular:hover {
    transform: scale(1.05) translateY(-8px);
}

.badge {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: bold;
    letter-spacing: 1px;
}

.price {
    font-size: 3.5rem;
    font-weight: 800;
    margin: 25px 0;
    color: var(--text-color);
}

.price span {
    font-size: 1rem;
    color: var(--text-light);
    font-weight: normal;
}

.pricing-card ul {
    list-style: none;
    margin-bottom: 40px;
    flex-grow: 1;
}

.pricing-card ul li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-light);
}

.pricing-card ul li:last-child {
    border-bottom: none;
}

/* Article Cards Section (SEO 图卡) */
.article-card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 30px 25px;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.03);
    text-decoration: none;
    color: inherit;
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
    border-color: rgba(255, 107, 129, 0.2);
}

.article-card-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.article-badge {
    display: inline-block;
    background: rgba(255, 107, 129, 0.1);
    color: var(--primary-color);
    font-size: 0.8rem;
    font-weight: bold;
    padding: 4px 12px;
    border-radius: 12px;
    margin-bottom: 12px;
    align-self: flex-start;
}

.article-card h3 {
    font-size: 1.15rem;
    color: var(--text-color);
    margin-bottom: 12px;
    line-height: 1.4;
    transition: var(--transition);
}

.article-card:hover h3 {
    color: var(--primary-color);
}

.article-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 20px;
    flex-grow: 1;
}

.read-more {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* Article Detail Page Styles */
.article-container {
    padding: 60px 20px;
    max-width: 860px;
    margin: 0 auto;
}

.article-detail {
    background: white;
    padding: 50px 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.article-header {
    margin-bottom: 40px;
    padding-bottom: 25px;
    border-bottom: 1px solid var(--border-color);
}

.article-category {
    background: var(--primary-color);
    color: white;
    padding: 4px 14px;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 600;
}

.article-header h1 {
    font-size: 2.2rem;
    margin: 20px 0 15px;
    line-height: 1.3;
    color: var(--text-color);
}

.article-meta {
    color: var(--text-light);
    font-size: 0.9rem;
}

.article-body h2 {
    font-size: 1.6rem;
    margin: 35px 0 18px;
    color: var(--text-color);
    border-left: 4px solid var(--primary-color);
    padding-left: 12px;
}

.article-body h3 {
    font-size: 1.25rem;
    margin: 25px 0 12px;
    color: var(--text-color);
}

.article-body p {
    font-size: 1.05rem;
    color: #4a5568;
    margin-bottom: 20px;
    line-height: 1.8;
}

.article-body ul, .article-body ol {
    margin: 0 0 25px 25px;
    color: #4a5568;
    font-size: 1.05rem;
}

.article-body li {
    margin-bottom: 10px;
    line-height: 1.7;
}

.cta-box {
    background: linear-gradient(135deg, #fff0f3 0%, #ffffff 100%);
    border: 2px dashed var(--primary-color);
    border-radius: var(--radius);
    padding: 35px;
    text-align: center;
    margin-top: 50px;
}

.cta-box h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

.cta-box p {
    color: var(--text-light);
    margin-bottom: 25px;
}

/* Reviews */
.review-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.review-text {
    font-style: italic;
    margin-bottom: 25px;
    color: var(--text-color);
    font-size: 1.05rem;
}

.reviewer {
    font-weight: 600;
    text-align: right;
    color: var(--primary-color);
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 35px;
}

.faq-item h4 {
    margin-bottom: 12px;
    font-size: 1.2rem;
    color: var(--text-color);
}

.faq-item p {
    color: var(--text-light);
    font-size: 1.05rem;
}

/* Footer */
footer {
    background-color: #2f3542;
    color: white;
    padding: 60px 0 40px;
}

.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.footer-links {
    margin-bottom: 30px;
    display: flex;
    gap: 30px;
}

.footer-links a {
    color: #ced6e0;
    transition: var(--transition);
    font-size: 1rem;
}

.footer-links a:hover {
    color: white;
}

.pbn-links {
    margin-bottom: 25px;
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

.pbn-label {
    color: #a4b0be;
    font-size: 0.9rem;
}

.pbn-links a {
    color: #ff6b81;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
}

.pbn-links a:hover {
    color: #ff4757;
    text-decoration: underline;
}

.copyright {
    color: #747d8c;
    font-size: 0.95rem;
}

/* Responsive */
@media (max-width: 900px) {
    .nav-menu {
        display: none;
    }
    
    .hero-container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        max-width: 100%;
        margin-bottom: 40px;
    }
    
    .hero-content h1 {
        font-size: 2.8rem;
    }
    
    .hero-visual {
        width: 100%;
        height: 350px;
    }
    
    .circle-decoration {
        width: 250px;
        height: 250px;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .grid-3, .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.popular {
        transform: none;
        z-index: 1;
    }
    
    .pricing-card.popular:hover {
        transform: translateY(-8px);
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
    
    section {
        padding: 60px 0;
    }

    .article-detail {
        padding: 30px 20px;
    }
}