/* Reset & Variables */
:root {
    --primary-color: #007bff;
    --secondary-color: #f8f9fa;
    --text-dark: #333;
    --text-light: #666;
    --bg-light: #f4f7f6;
    --white: #ffffff;
    --border-radius: 8px;
    --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-dark);
    line-height: 1.6;
    background-color: var(--white);
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* Typography */
h1, h2, h3 {
    margin-bottom: 1rem;
    font-weight: 700;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #222;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: bold;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    border: 2px solid var(--primary-color);
}

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    display: block;
    width: 100%;
}
.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

/* Navbar */
.navbar {
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    position: sticky;
    top: 15px;
    z-index: 1000;
    width: 92%;
    max-width: 1100px;
    margin: 15px auto;
    border-radius: 50px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.navbar:hover {
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 65px;
    padding: 0 2rem;
}

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

.nav-menu {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    font-weight: 600;
    color: var(--text-dark);
}

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

/* Hero Section */
.hero {
    padding: 6rem 0;
    background: linear-gradient(135deg, #e0eafc 0%, #cfdef3 100%);
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.hero-text {
    flex: 1;
}

.hero-text h1 {
    font-size: 2.8rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero-text h2 {
    font-size: 1.2rem;
    color: var(--text-light);
    font-weight: normal;
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.dynamic-element {
    width: 100%;
    max-width: 550px;
}

.hero-img {
    max-width: 100%;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

/* Animations */
.pulse {
    animation: pulse-animation 2s infinite ease-in-out;
}

@keyframes pulse-animation {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* Sections */
.section {
    padding: 5rem 0;
}

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

/* Grids */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

/* Cards */
.card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: var(--transition);
}

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

.feature-card .icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.media-card {
    padding: 0;
    overflow: hidden;
}

.media-card img {
    width: 100%;
    height: auto;
    display: block;
}

.media-card h3, .media-card p {
    padding: 1rem 1.5rem;
}

/* Pricing */
.pricing-card {
    text-align: center;
    position: relative;
    border: 1px solid #eaeaea;
}

.pricing-card.popular {
    border: 2px solid var(--primary-color);
    transform: scale(1.05);
}

.pricing-card.popular:hover {
    transform: scale(1.05) translateY(-5px);
}

.pricing-card .badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
}

.pricing-card .price {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin: 1.5rem 0;
}

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

.pricing-features {
    list-style: none;
    margin-bottom: 2rem;
}

.pricing-features li {
    margin-bottom: 0.8rem;
    color: var(--text-light);
}

/* Article Cards */
.article-card {
    display: block;
    color: inherit;
}
.article-card h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
}
.article-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Testimonials */
.testimonial-card {
    font-style: italic;
}
.testimonial-card .stars {
    margin-bottom: 1rem;
}
.testimonial-card .author {
    margin-top: 1rem;
    font-weight: bold;
    font-style: normal;
    text-align: right;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #ddd;
    padding-bottom: 1rem;
}
.faq-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: #222;
}
.faq-item p {
    color: var(--text-light);
}

/* Footer */
.footer {
    background-color: #222;
    color: #ccc;
    padding: 3rem 0;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-links a {
    color: #fff;
    font-weight: bold;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-copyright {
    font-size: 0.9rem;
}

.pbn-links {
    margin-top: 1rem;
    font-size: 0.9rem;
}

.pbn-links a {
    color: #88aaff; /* 显色处理 */
    font-weight: bold;
    text-decoration: underline;
    margin: 0 0.5rem;
}
.pbn-links a:hover {
    color: #fff;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none; /* Simplification for mobile without JS */
    }
    
    .hero-container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .grid-3, .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.popular {
        transform: scale(1);
    }
    .pricing-card.popular:hover {
        transform: translateY(-5px);
    }
}