:root {
    --text-main: #1e293b;
    --text-muted: #475569;
    --primary-color: #0284c7;
    --secondary-color: #0ea5e9;
    --accent-color: #38bdf8;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
}

body {
    margin: 0;
    font-family: 'KaiTi', '楷体', STKaiti, serif;
    background: linear-gradient(to right, rgb(0, 90, 167), rgb(255, 253, 228));
    background-attachment: fixed;
    color: var(--text-main);
    line-height: 1.8;
    overflow-x: hidden;
}

/* Asymmetrical container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
}

nav {
    position: fixed;
    top: 20px;
    left: 5%;
    width: 90%;
    border-radius: 50px;
    padding: 15px 40px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    box-sizing: border-box;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}
nav:hover {
    transform: translateY(-2px);
}

nav .logo {
    font-size: 26px;
    font-weight: 900;
    color: #0f172a;
    text-decoration: none;
    letter-spacing: 2px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Microsoft YaHei', sans-serif;
}
nav ul {
    list-style: none;
    display: flex;
    gap: 45px;
    margin: 0;
    padding: 0;
    align-items: center;
}
nav ul li a {
    text-decoration: none;
    color: #1e293b;
    font-size: 1.05rem;
    font-weight: bold;
    position: relative;
    padding-bottom: 5px;
    transition: color 0.3s ease;
}
nav ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}
nav ul li a:hover {
    color: var(--primary-color);
}
nav ul li a:hover::after {
    width: 100%;
}

.nav-btn {
    background: linear-gradient(135deg, #0284c7, #38bdf8);
    padding: 12px 30px;
    border-radius: 30px;
    color: white !important;
    font-weight: bold;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(2, 132, 199, 0.4);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.nav-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(2, 132, 199, 0.6);
}

/* Parallax Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 100px;
    position: relative;
    perspective: 1000px;
}
.hero-content {
    width: 50%;
    padding: 60px;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    border-radius: 30px;
    border: 1px solid rgba(255, 255, 255, 0.8);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    transform: rotateY(5deg) translateZ(50px);
    transition: transform 0.5s ease;
}
.hero-content:hover {
    transform: rotateY(0deg) translateZ(80px);
}
.hero h1 {
    font-size: 4rem;
    margin-bottom: 25px;
    font-weight: 900;
    line-height: 1.2;
    background: linear-gradient(to right, #0f172a, #0284c7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-family: 'Microsoft YaHei', sans-serif;
}
.hero p {
    font-size: 1.2rem;
    color: #334155;
    margin-bottom: 45px;
}

.hero-image {
    width: 45%;
    display: flex;
    justify-content: center;
    animation: float 6s ease-in-out infinite;
    z-index: 2;
}
.hero-image svg {
    max-width: 100%;
    width: 400px;
    filter: drop-shadow(0 20px 30px rgba(0,0,0,0.1));
}

/* Floating Decorative Elements */
.blob {
    position: absolute;
    filter: blur(80px);
    z-index: -1;
    opacity: 0.6;
    animation: float 10s ease-in-out infinite;
}
.blob-1 {
    top: 20%;
    right: 10%;
    width: 400px;
    height: 400px;
    background: #38bdf8;
    border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
}
.blob-2 {
    bottom: -10%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: #0284c7;
    border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
    animation-delay: -5s;
}

@keyframes float {
    0% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-30px) rotate(10deg); }
    100% { transform: translateY(0) rotate(0deg); }
}

section {
    padding: 100px 0;
    position: relative;
}
.section-header {
    text-align: left;
    margin-bottom: 70px;
    padding-left: 50px;
    border-left: 8px solid var(--primary-color);
}
.section-header h2 {
    font-size: 3rem;
    margin-bottom: 10px;
    color: #0f172a;
    font-family: 'Microsoft YaHei', sans-serif;
}

/* Asymmetrical Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}
.feature-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    padding: 50px 40px;
    border-radius: 30px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 15px 35px rgba(0,0,0,0.05);
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.feature-card:nth-child(2) { transform: translateY(50px); }
.feature-card:nth-child(3) { transform: translateY(-30px); }
.feature-card:hover {
    transform: translateY(-10px) scale(1.03) !important;
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 25px 50px rgba(0,0,0,0.1);
}
.feature-icon {
    font-size: 3.5rem;
    margin-bottom: 25px;
}
.feature-card h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    font-family: 'Microsoft YaHei', sans-serif;
}

/* Pricing Section */
.pricing-grid {
    display: flex;
    gap: 30px;
    justify-content: center;
    align-items: flex-end;
}
.pricing-card {
    background: rgba(15, 23, 42, 0.9);
    color: white;
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 24px;
    padding: 50px 40px;
    text-align: center;
    flex: 1;
    transition: transform 0.4s ease, box-shadow 0.4s ease;
    position: relative;
    overflow: hidden;
}
.pricing-card::before {
    content: '';
    position: absolute;
    top: 0; left: -100%; width: 50%; height: 100%;
    background: linear-gradient(to right, transparent, rgba(255,255,255,0.1), transparent);
    transform: skewX(-25deg);
    transition: 0.5s;
}
.pricing-card:hover::before {
    left: 200%;
}
.pricing-card:hover {
    transform: translateY(-20px);
    box-shadow: 0 30px 60px rgba(0,0,0,0.3);
}
.pricing-card.popular {
    background: linear-gradient(135deg, #1e1b4b, #172554);
    padding: 70px 40px;
    border-color: #38bdf8;
    transform: translateY(-20px);
}
.pricing-card.popular:hover {
    transform: translateY(-35px);
}
.popular-badge {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(90deg, #8b5cf6, #3b82f6);
    padding: 8px 25px;
    border-radius: 20px;
    font-weight: bold;
    letter-spacing: 1px;
}
.pricing-card h3 {
    font-size: 1.6rem;
    margin-bottom: 15px;
    color: #cbd5e1;
}
.price-value {
    font-size: 4rem;
    font-weight: 900;
    margin-bottom: 30px;
    font-family: 'Microsoft YaHei', sans-serif;
}
.price-value span { font-size: 1.2rem; font-weight: normal; }
.pricing-card ul {
    list-style: none;
    padding: 0;
    text-align: left;
    margin-bottom: 40px;
}
.pricing-card ul li {
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    font-size: 1.1rem;
}
.pricing-card ul li::before {
    content: '✔';
    color: #38bdf8;
    margin-right: 12px;
    font-size: 1.2rem;
}
.btn-buy {
    display: inline-block;
    width: 100%;
    padding: 15px 0;
    background: transparent;
    border: 2px solid rgba(255,255,255,0.3);
    color: white;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}
.btn-buy:hover {
    background: white;
    color: #0f172a;
}
.popular .btn-buy {
    background: linear-gradient(90deg, #8b5cf6, #3b82f6);
    border: none;
}
.popular .btn-buy:hover {
    background: linear-gradient(90deg, #7c3aed, #2563eb);
    color: white;
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.4);
}

/* Articles */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}
.article-card {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    text-decoration: none;
    color: var(--text-main);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.article-card:hover {
    transform: translateY(-10px) rotate(1deg);
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}
.article-card h4 {
    font-size: 1.4rem;
    margin: 0 0 15px 0;
    color: #0f172a;
}

/* Article Pages Content */
.article-container {
    max-width: 900px;
    margin: 150px auto 60px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    padding: 60px;
    border-radius: 30px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 25px 50px rgba(0,0,0,0.1);
}
.article-container h1 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 20px;
    font-family: 'Microsoft YaHei', sans-serif;
}
.article-meta {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px dashed rgba(0,0,0,0.1);
}
.article-container p {
    text-indent: 2.5em;
    font-size: 1.2rem;
    line-height: 2;
    margin-bottom: 25px;
}
.internal-link {
    color: var(--primary-color);
    font-weight: bold;
    text-decoration: none;
    position: relative;
}
.internal-link::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    bottom: -2px;
    left: 0;
    background: var(--primary-color);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}
.internal-link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* FAQ section */
.faq-section {
    margin-top: 60px;
}
.faq-section dt {
    background: rgba(255, 255, 255, 0.9);
    padding: 20px 25px;
    border-radius: 15px 15px 0 0;
    font-weight: bold;
    font-size: 1.25rem;
    margin-top: 25px;
    border: 1px solid var(--glass-border);
    border-bottom: none;
}
.faq-section dd {
    margin: 0;
    background: rgba(255, 255, 255, 0.5);
    padding: 20px 25px;
    border-radius: 0 0 15px 15px;
    border: 1px solid var(--glass-border);
    border-top: none;
    font-size: 1.15rem;
}

footer {
    text-align: center;
    padding: 50px;
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255,255,255,0.2);
    font-size: 1.1rem;
}

@media (max-width: 900px) {
    .hero { flex-direction: column; }
    .hero-content { width: 100%; transform: none; padding: 40px 20px; }
    .hero-image { width: 100%; margin-top: 30px; }
    .features-grid { grid-template-columns: 1fr; }
    .feature-card:nth-child(2), .feature-card:nth-child(3) { transform: none; }
    .pricing-grid { flex-direction: column; align-items: stretch; }
    .pricing-card.popular { transform: none; padding: 50px 40px; }
    nav ul { display: none; }
}