:root {
    --primary-color: #ff6b81;
    --text-dark: #333;
    --text-light: #fff;
    --glass-bg: rgba(25, 25, 30, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    font-family: 'Kaiti', 'STKaiti', 'KaiTi_GB2312', '楷体', serif;
    background-color: #f5f5f5;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background */
.bg-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: linear-gradient(135deg, #fbc2eb 0%, #a6c1ee 100%); /* Fallback gradient */
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}
.bg-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(to bottom, rgba(255,255,255,0.1), rgba(255,255,255,0.6));
}

/* Navbar */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    transition: var(--transition);
}
nav.scrolled {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    padding: 15px 50px;
}
.logo {
    font-size: 28px;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: 2px;
}
.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}
.nav-links li a {
    text-decoration: none;
    color: var(--text-dark);
    font-size: 18px;
    position: relative;
    padding: 5px 0;
    transition: var(--transition);
}
.nav-links li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}
.nav-links li a:hover::after {
    width: 100%;
}
.nav-links li a.active {
    color: var(--primary-color);
}
.nav-btn {
    background: var(--primary-color);
    color: white !important;
    padding: 8px 25px !important;
    border-radius: 30px;
}
.nav-btn::after { display: none !important; }
.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 129, 0.4);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 20px;
}
.hero h1 {
    font-size: 5rem;
    color: var(--text-dark);
    margin-bottom: 20px;
    text-shadow: 2px 2px 10px rgba(255,255,255,0.8);
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 1s forwards 0.3s;
}
.hero p {
    font-size: 1.5rem;
    color: #555;
    max-width: 800px;
    margin-bottom: 40px;
    text-shadow: 1px 1px 5px rgba(255,255,255,0.8);
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 1s forwards 0.6s;
}
.btn {
    display: inline-block;
    padding: 15px 40px;
    font-size: 1.2rem;
    text-decoration: none;
    border-radius: 50px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}
.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 10px 20px rgba(255, 107, 129, 0.3);
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 25px rgba(255, 107, 129, 0.5);
}
.hero .btn {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 1s forwards 0.9s;
}

/* Sections */
section {
    padding: 100px 50px;
    max-width: 1200px;
    margin: 0 auto;
}
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: var(--text-dark);
}

/* Pricing - Dark Glassmorphism */
.pricing-cards {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}
.pricing-card {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 40px 30px;
    width: 320px;
    color: white;
    box-shadow: var(--glass-shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.pricing-card:hover {
    transform: translateY(-10px);
    border-color: rgba(255, 107, 129, 0.5);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5);
}
.pricing-card.featured {
    transform: scale(1.05);
    border-color: var(--primary-color);
}
.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-10px);
}
.featured-badge {
    position: absolute;
    top: 0; left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 5px 20px;
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
    font-size: 0.9rem;
}
.pricing-title {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #ddd;
}
.pricing-price {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 20px;
    display: flex;
    align-items: baseline;
}
.pricing-price span {
    font-size: 1rem;
    font-weight: normal;
    color: #aaa;
    margin-left: 5px;
}
.pricing-features {
    list-style: none;
    margin-bottom: 30px;
}
.pricing-features li {
    margin-bottom: 12px;
    font-size: 1rem;
    display: flex;
    align-items: center;
    color: #ccc;
}
.pricing-features li::before {
    content: '✓';
    color: var(--primary-color);
    margin-right: 10px;
    font-weight: bold;
}
.pricing-btn {
    display: block;
    width: 100%;
    padding: 12px 0;
    text-align: center;
    text-decoration: none;
    border-radius: 30px;
    font-size: 1.1rem;
    transition: var(--transition);
    background: transparent;
    border: 1px solid rgba(255,255,255,0.3);
    color: white;
}
.pricing-card.featured .pricing-btn {
    background: var(--primary-color);
    border: none;
}
.pricing-btn:hover {
    background: rgba(255,255,255,0.1);
}
.pricing-card.featured .pricing-btn:hover {
    background: #ff526a;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}
.feature-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.5);
}
.feature-card:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.9);
}
.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}
.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    margin-bottom: 15px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.03);
}
.faq-question {
    padding: 20px;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: bold;
}
.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    color: #555;
}
.faq-item.active .faq-answer {
    padding: 0 20px 20px 20px;
    max-height: 200px;
}

/* Article List */
.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}
.article-card {
    background: rgba(255,255,255,0.8);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-dark);
    display: block;
}
.article-card:hover {
    transform: translateY(-5px);
    background: rgba(255,255,255,0.95);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}
.article-card h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}
.article-card p {
    color: #666;
    font-size: 0.95rem;
}

/* Footer */
footer {
    background: rgba(25, 25, 30, 0.9);
    color: white;
    text-align: center;
    padding: 40px 20px;
    margin-top: 50px;
}
.footer-links a {
    color: #aaa;
    text-decoration: none;
    margin: 0 10px;
    transition: var(--transition);
}
.footer-links a:hover {
    color: var(--primary-color);
}

/* Animations */
@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease;
}
.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Article Page Specifics */
.article-container {
    max-width: 900px;
    margin: 120px auto 50px auto;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(15px);
    padding: 50px;
    border-radius: 20px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.08);
}
.breadcrumb {
    margin-bottom: 20px;
    font-size: 0.9rem;
}
.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
}
.article-title {
    font-size: 2.5rem;
    margin-bottom: 20px;
    text-align: center;
}
.article-meta {
    text-align: center;
    color: #888;
    margin-bottom: 40px;
}
.article-content {
    font-size: 1.1rem;
    line-height: 1.8;
}
.article-content h2 {
    margin: 30px 0 15px 0;
    color: var(--primary-color);
}
.article-content p {
    margin-bottom: 15px;
    text-indent: 2em;
}
.article-content ul {
    margin-bottom: 15px;
    padding-left: 40px;
}

/* Dynamic Dotting Animation */
.dynamic-dots {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}
.dot {
    position: absolute;
    background: rgba(255, 107, 129, 0.5);
    border-radius: 50%;
    animation: float 10s infinite ease-in-out;
}
@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.5; }
    50% { transform: translateY(-20px) scale(1.2); opacity: 0.8; }
}