/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: #f4f7f6;
    color: #2c3e50;
    line-height: 1.6;
}

/* Typography */
h1, h2, h3, h4 {
    color: #1a252f;
    margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; line-height: 1.2; }
h2 { font-size: 2rem; text-align: center; margin-bottom: 2rem; }
h3 { font-size: 1.25rem; }

a {
    text-decoration: none;
    color: #00b894;
    transition: color 0.3s;
}
a:hover { color: #00896f; }

/* Layout & Containers */
.section {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    scroll-margin-top: 100px; /* 解决固定导航栏遮挡锚点标题的问题 */
}
.bg-light {
    background-color: #eef2f1;
    max-width: 100%;
}

/* 导航栏 - 椭圆形设计 */
.navbar-wrapper {
    position: sticky;
    top: 1rem;
    z-index: 100;
    display: flex;
    justify-content: center;
    width: 100%;
    padding: 0 1rem;
}
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
    border-radius: 50px;
    width: 100%;
    max-width: 1000px;
}
.nav-container {
    padding: 0.8rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #00b894;
}
.nav-links {
    display: none;
}
@media (min-width: 768px) {
    .nav-links {
        display: flex;
        gap: 2rem;
    }
    .nav-links a {
        color: #34495e;
        font-weight: 500;
    }
    .nav-links a:hover {
        color: #00b894;
    }
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-primary-small {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}
.btn-primary {
    background-color: #00b894;
    color: #ffffff;
    border: none;
    box-shadow: 0 4px 15px rgba(0, 184, 148, 0.3);
}
.btn-primary:hover {
    background-color: #00896f;
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 184, 148, 0.4);
}
.btn-secondary {
    background-color: #dfe6e9;
    color: #2d3436;
}
.btn-secondary:hover {
    background-color: #b2bec3;
    color: #2d3436;
}
.btn-primary-small {
    padding: 0.5rem 1.2rem;
    background-color: #00b894;
    color: #ffffff;
}

/* Hero Section */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 6rem 2rem 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    gap: 3rem;
}
.hero-content {
    text-align: center;
    flex: 1;
}
.hero-content p {
    font-size: 1.125rem;
    color: #7f8c8d;
    margin-bottom: 2rem;
}
.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    height: 300px;
    width: 100%;
}
@media (min-width: 768px) {
    .hero {
        flex-direction: row;
        text-align: left;
        padding: 8rem 2rem 6rem 2rem;
    }
    .hero-content {
        text-align: left;
    }
}

/* Animations */
.dynamic-globe {
    width: 160px;
    height: 160px;
    background: linear-gradient(135deg, #00b894, #55efc4);
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    position: relative;
    z-index: 2;
    animation: morph 8s ease-in-out infinite;
}
.pulse-ring {
    position: absolute;
    width: 160px;
    height: 160px;
    border: 2px dashed #00b894;
    border-radius: 50%;
    z-index: 1;
    animation: spin 10s linear infinite;
}
@keyframes morph {
    0% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; transform: translateY(0); }
    50% { border-radius: 70% 30% 30% 70% / 70% 70% 30% 30%; transform: translateY(-20px); }
    100% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; transform: translateY(0); }
}
@keyframes spin {
    100% { transform: rotate(360deg); }
}

/* Icons (Replacement for broken images) */
.emoji-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: inline-block;
}
.media-card .emoji-icon {
    font-size: 4rem;
}
.article-img-placeholder {
    width: 100%;
    height: 160px;
    background: linear-gradient(135deg, #eef2f1, #dfe6e9);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
}

/* Card Grids */
.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}
@media (min-width: 768px) {
    .card-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}
.card {
    background: #ffffff;
    padding: 2.5rem 2rem;
    border-radius: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.03);
    text-align: center;
    transition: transform 0.3s;
}
.card:hover { transform: translateY(-8px); }

.card-grid-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}
@media (min-width: 768px) {
    .card-grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
}
.media-card {
    background: #ffffff;
    padding: 2rem;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.03);
}

/* Pricing */
.pricing-table {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: center;
}
@media (min-width: 768px) {
    .pricing-table {
        grid-template-columns: repeat(3, 1fr);
    }
}
.price-card {
    background: #ffffff;
    padding: 3rem 2rem;
    border-radius: 25px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.03);
    text-align: center;
    position: relative;
    border: 1px solid #eef2f1;
}
.price-card.popular {
    border: 2px solid #00b894;
    transform: scale(1.05);
    box-shadow: 0 15px 30px rgba(0, 184, 148, 0.15);
}
.badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: #00b894;
    color: white;
    padding: 0.4rem 1.2rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: bold;
}
.price {
    font-size: 3.5rem;
    font-weight: bold;
    color: #2c3e50;
    margin: 1.5rem 0;
}
.price span {
    font-size: 1rem;
    color: #95a5a6;
    font-weight: normal;
}
.price-card ul {
    list-style: none;
    margin-bottom: 2.5rem;
    text-align: left;
}
.price-card ul li {
    padding: 0.8rem 0;
    color: #7f8c8d;
    border-bottom: 1px dashed #eef2f1;
}

/* SEO Articles Grid */
.article-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem 3rem 2rem;
}
@media (min-width: 640px) {
    .article-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
    .article-grid { grid-template-columns: repeat(3, 1fr); }
}
.article-card {
    background: #fff;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 3px 10px rgba(0,0,0,0.04);
    transition: transform 0.3s;
    display: flex;
    flex-direction: column;
}
.article-card:hover {
    transform: translateY(-5px);
}
.article-card h3 {
    font-size: 1.1rem;
    margin: 1.2rem 1rem 0.5rem 1rem;
}
.article-card p {
    font-size: 0.9rem;
    color: #7f8c8d;
    margin: 0 1rem 1rem 1rem;
    flex-grow: 1;
}
.article-card .read-more {
    display: block;
    margin: 0 1rem 1rem 1rem;
    font-weight: bold;
    text-align: right;
}

/* Single SEO Article Page Styles */
.article-page {
    max-width: 800px;
    margin: 4rem auto;
    background: #fff;
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}
.article-page h1 {
    font-size: 2.2rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid #eef2f1;
    padding-bottom: 1rem;
}
.article-page p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: #34495e;
    line-height: 1.8;
}
.article-page strong {
    color: #2c3e50;
}
.article-page .back-link {
    display: inline-block;
    margin-bottom: 2rem;
    font-weight: bold;
}

/* Reviews */
.review-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}
@media (min-width: 768px) {
    .review-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
.review {
    background: #ffffff;
    padding: 2rem;
    border-radius: 20px;
    border-left: 5px solid #00b894;
    font-style: italic;
    box-shadow: 0 3px 10px rgba(0,0,0,0.03);
}
.review h4 {
    margin-top: 1rem;
    font-style: normal;
    text-align: right;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    margin-bottom: 1.5rem;
    background: #ffffff;
    padding: 1.8rem;
    border-radius: 15px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.03);
}

/* Footer */
.footer {
    background: #1a252f;
    color: #bdc3c7;
    padding: 4rem 2rem 2rem 2rem;
    text-align: center;
}
.footer-links {
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}
.footer-links a {
    color: #ecf0f1;
}
.footer-links a:hover {
    color: #00b894;
}
.footer-copyright {
    border-top: 1px solid #2c3e50;
    padding-top: 2rem;
    font-size: 0.875rem;
}
.pbn-links {
    margin-top: 1rem;
}
.seo-link {
    color: #00b894;
    font-weight: 500;
    text-decoration: underline;
}
.seo-link:hover {
    color: #55efc4;
}