:root {
    /* Color Palette */
    --color-primary: hsl(250, 84%, 54%);
    --color-primary-light: hsl(250, 84%, 64%);
    --color-primary-dark: hsl(250, 84%, 44%);
    --color-secondary: hsl(280, 80%, 60%);
    --color-accent: hsl(340, 82%, 52%);
    --color-success: hsl(142, 76%, 36%);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, hsl(250, 84%, 54%) 0%, hsl(280, 80%, 60%) 100%);
    --gradient-accent: linear-gradient(135deg, hsl(340, 82%, 52%) 0%, hsl(280, 80%, 60%) 100%);
    --gradient-hero: linear-gradient(180deg, hsl(240, 20%, 8%) 0%, hsl(240, 15%, 12%) 100%);
    
    /* Dark Theme Colors */
    --color-bg-primary: hsl(240, 20%, 8%);
    --color-bg-secondary: hsl(240, 15%, 12%);
    --color-bg-tertiary: hsl(240, 12%, 16%);
    --color-bg-card: hsla(240, 15%, 16%, 0.6);
    --color-bg-card-hover: hsla(240, 15%, 20%, 0.8);
    
    --color-text-primary: hsl(0, 0%, 98%);
    --color-text-secondary: hsl(0, 0%, 75%);
    --color-text-tertiary: hsl(0, 0%, 60%);
    
    --color-border: hsla(240, 10%, 30%, 0.3);
    --color-border-light: hsla(240, 10%, 40%, 0.2);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-chinese: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(124, 58, 237, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary), var(--font-chinese);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: hsla(240, 20%, 8%, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: hsla(240, 20%, 8%, 0.95);
    box-shadow: var(--shadow-md);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    color: var(--color-text-primary);
    font-weight: 800;
    font-size: 1.5rem;
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
}

.logo-icon {
    font-size: 2rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--color-text-primary);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link-primary {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
}

.nav-link-primary::after {
    display: none;
}

.nav-link-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--gradient-primary);
    top: -200px;
    right: -100px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--gradient-accent);
    bottom: -150px;
    left: -100px;
    animation-delay: -5s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: var(--color-secondary);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(10px);
    animation: slideDown 0.6s ease;
}

.badge-icon {
    font-size: 1.2rem;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease 0.2s both;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.hero-subtitle {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    font-weight: 300;
    letter-spacing: 0.05em;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
    animation: fadeInUp 0.8s ease 0.6s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.8s ease 0.8s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

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

.btn-secondary:hover {
    background: var(--color-bg-card);
    border-color: var(--color-primary);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 1.2rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 1s both;
}

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

.stat-value {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--color-text-tertiary);
    font-size: 0.9rem;
    margin-top: var(--spacing-xs);
}

/* Section Styles */
.section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-badge {
    display: inline-block;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-xl);
    font-size: 0.9rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
}

.section-description {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.about-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.about-card:hover {
    background: var(--color-bg-card-hover);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.about-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.about-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.about-card p {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* Principles Section */
.principles-section {
    background: var(--color-bg-secondary);
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.principle-card {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
    overflow: hidden;
}

.principle-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.principle-card:hover::before {
    transform: scaleX(1);
}

.principle-card:hover {
    background: var(--color-bg-card-hover);
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.principle-number {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 4rem;
    font-weight: 900;
    color: hsla(250, 84%, 54%, 0.1);
}

.principle-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
}

.principle-title {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.principle-subtitle {
    color: var(--color-primary);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.05em;
}

.principle-description {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.principle-features {
    list-style: none;
    margin-top: var(--spacing-md);
}

.principle-features li {
    color: var(--color-text-tertiary);
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
}

.principle-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.feature-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
}

.feature-item:hover {
    background: var(--color-bg-card-hover);
    transform: translateY(-5px);
    border-color: var(--color-primary);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.feature-item h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.feature-item p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* Maturity Section */
.maturity-section {
    background: var(--color-bg-secondary);
}

.maturity-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    max-width: 800px;
    margin: 0 auto;
}

.maturity-item {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.maturity-item:hover {
    background: var(--color-bg-card-hover);
    transform: translateX(10px);
    border-color: var(--color-primary);
}

.maturity-level {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    color: white;
}

.maturity-content {
    flex: 1;
}

.maturity-content h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.maturity-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.maturity-tag {
    display: inline-block;
    background: hsla(250, 84%, 54%, 0.2);
    color: var(--color-primary);
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
}

/* Learning Paths */
.learning-paths {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.path-card {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.path-card:hover {
    background: var(--color-bg-card-hover);
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.path-card-featured {
    border-color: var(--color-primary);
    box-shadow: 0 0 30px rgba(124, 58, 237, 0.2);
}

.path-badge {
    position: absolute;
    top: -12px;
    right: var(--spacing-lg);
    background: var(--gradient-primary);
    color: white;
    padding: 4px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
}

.path-header {
    margin-bottom: var(--spacing-lg);
}

.path-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.path-header h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

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

.path-steps {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.path-steps li {
    color: var(--color-text-secondary);
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    border-left: 2px solid var(--color-border);
}

.path-steps li::before {
    content: '';
    position: absolute;
    left: -5px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-primary);
}

.path-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all var(--transition-fast);
}

.path-link:hover {
    gap: var(--spacing-sm);
}

/* CTA Section */
.cta-section {
    background: var(--color-bg-secondary);
    text-align: center;
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
}

.cta-description {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
.footer {
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 800;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.footer-tagline {
    color: var(--color-text-tertiary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-column h4 {
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: var(--spacing-sm);
}

.footer-column a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-tertiary);
    font-size: 0.9rem;
}

.footer-bottom p {
    margin: var(--spacing-xs) 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero {
        min-height: auto;
        padding: var(--spacing-3xl) 0;
    }
    
    .hero-stats {
        gap: var(--spacing-lg);
    }
    
    .stat-value {
        font-size: 2rem;
    }
    
    .about-content,
    .principles-grid,
    .features-grid,
    .learning-paths {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .maturity-item {
        flex-direction: column;
        text-align: center;
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}