/* CSS Variables */
:root {
    --color-bg: #0A1628;
    --color-bg-light: #0F2744;
    --color-primary: #3B82F6;
    --color-primary-light: #60A5FA;
    --color-accent: #06B6D4;
    --color-accent-light: #22D3EE;
    --color-text: #F8FAFC;
    --color-text-muted: #94A3B8;
    --color-card: #1E3A5F;
    --color-card-hover: #2D4A6F;
    --gradient-primary: linear-gradient(135deg, #3B82F6 0%, #06B6D4 100%);
    --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.3);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 22, 40, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(59, 130, 246, 0.2);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
}

.logo-icon {
    font-size: 28px;
}

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

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    color: var(--color-text-muted);
    font-weight: 500;
    transition: color 0.3s;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(59, 130, 246, 0.5);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    padding: 120px 0 80px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.grid-lines {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(59, 130, 246, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.1) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
}

.glow-1 {
    width: 600px;
    height: 600px;
    background: var(--color-primary);
    top: -200px;
    right: -100px;
}

.glow-2 {
    width: 400px;
    height: 400px;
    background: var(--color-accent);
    bottom: -100px;
    left: -100px;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text h1 {
    font-size: 56px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-text h1 .highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--color-text-muted);
    margin-bottom: 40px;
}

/* Search Box */
.search-box {
    background: rgba(30, 58, 95, 0.6);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 20px;
    padding: 24px;
}

.search-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.search-select,
.search-input {
    flex: 1;
    min-width: 140px;
    padding: 16px 20px;
    border-radius: 12px;
    border: 1px solid rgba(59, 130, 246, 0.3);
    background: rgba(10, 22, 40, 0.8);
    color: var(--color-text);
    font-size: 16px;
    outline: none;
    transition: border-color 0.3s;
}

.search-select:focus,
.search-input:focus {
    border-color: var(--color-primary);
}

.search-select option,
.search-input::placeholder {
    color: var(--color-text-muted);
}

.btn-ai {
    background: var(--gradient-primary);
    color: white;
    padding: 16px 32px;
    font-size: 16px;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
    white-space: nowrap;
}

.btn-ai:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(59, 130, 246, 0.5);
}

.btn-icon {
    font-size: 18px;
}

.search-hint {
    margin-top: 12px;
    font-size: 14px;
    color: var(--color-text-muted);
    text-align: center;
}

/* AI Brain Visual */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.ai-brain {
    position: relative;
    width: 300px;
    height: 300px;
}

.brain-core {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    box-shadow: var(--shadow-glow);
    animation: pulse 2s ease-in-out infinite;
}

.brain-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid rgba(59, 130, 246, 0.3);
    border-radius: 50%;
    animation: rotate 10s linear infinite;
}

.ring-1 {
    width: 150px;
    height: 150px;
    border-top-color: var(--color-primary);
}

.ring-2 {
    width: 200px;
    height: 200px;
    border-bottom-color: var(--color-accent);
    animation-direction: reverse;
    animation-duration: 15s;
}

.ring-3 {
    width: 260px;
    height: 260px;
    border-left-color: var(--color-primary);
    animation-duration: 20s;
}

.brain-node {
    position: absolute;
    padding: 8px 16px;
    background: rgba(30, 58, 95, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.5);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    animation: float 3s ease-in-out infinite;
}

.node-1 { top: 20px; left: 50%; transform: translateX(-50%); animation-delay: 0s; }
.node-2 { top: 50%; right: 0; transform: translateY(-50%); animation-delay: 0.5s; }
.node-3 { bottom: 20px; left: 50%; transform: translateX(-50%); animation-delay: 1s; }
.node-4 { top: 50%; left: 0; transform: translateY(-50%); animation-delay: 1.5s; }

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
    50% { transform: translate(-50%, -50%) scale(1.1); opacity: 0.8; }
}

@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

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

/* Features Section */
.features {
    padding: 100px 0;
    background: var(--color-bg-light);
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--color-text-muted);
    text-align: center;
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: rgba(30, 58, 95, 0.4);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 20px;
    padding: 32px 24px;
    text-align: center;
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-primary);
    background: rgba(30, 58, 95, 0.6);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-bottom: 16px;
    line-height: 1.7;
}

.feature-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--gradient-primary);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

/* Data Section */
.data-section {
    padding: 80px 0;
    background: linear-gradient(180deg, var(--color-bg-light) 0%, var(--color-bg) 100%);
}

.data-stats {
    display: flex;
    justify-content: space-around;
    text-align: center;
}

.stat-item {
    padding: 20px;
}

.stat-number {
    font-size: 56px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 16px;
    color: var(--color-text-muted);
}

/* Reviews Section */
.reviews {
    padding: 100px 0;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.review-card {
    background: rgba(30, 58, 95, 0.4);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 20px;
    padding: 28px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.review-avatar {
    font-size: 48px;
    flex-shrink: 0;
}

.review-text {
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 16px;
    color: var(--color-text);
}

.review-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.review-name {
    font-weight: 600;
    color: var(--color-primary-light);
}

.review-score {
    font-size: 13px;
    color: var(--color-text-muted);
}

/* Experts Section */
.experts {
    padding: 100px 0;
    background: var(--color-bg-light);
}

.experts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.expert-card {
    background: rgba(30, 58, 95, 0.4);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 20px;
    padding: 40px 28px;
    text-align: center;
    transition: all 0.3s;
}

.expert-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-primary);
}

.expert-avatar {
    font-size: 64px;
    margin-bottom: 20px;
}

.expert-card h3 {
    font-size: 22px;
    margin-bottom: 8px;
}

.expert-title {
    color: var(--color-primary-light);
    font-weight: 600;
    margin-bottom: 16px;
}

.expert-desc {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* CTA Section */
.cta-section {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-light) 100%);
}

.cta-section h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 18px;
    color: var(--color-text-muted);
    margin-bottom: 40px;
}

.btn-large {
    padding: 20px 48px;
    font-size: 18px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(59, 130, 246, 0.4);
    transition: all 0.3s;
}

.btn-large:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(59, 130, 246, 0.5);
}

.arrow {
    margin-left: 8px;
    transition: transform 0.3s;
}

.btn-large:hover .arrow {
    transform: translateX(6px);
}

/* Footer */
.footer {
    padding: 60px 0 40px;
    background: var(--color-bg-light);
    border-top: 1px solid rgba(59, 130, 246, 0.2);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    color: var(--color-text-muted);
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: 14px;
}

.beian {
    font-size: 12px !important;
    margin-top: 8px;
}

/* Responsive */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .experts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
    }
    
    .nav {
        display: none;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text h1 {
        font-size: 36px;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .ai-brain {
        width: 200px;
        height: 200px;
    }
    
    .brain-ring {
        display: none;
    }
    
    .search-row {
        flex-direction: column;
    }
    
    .search-select,
    .search-input {
        width: 100%;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .experts-grid {
        grid-template-columns: 1fr;
    }
    
    .reviews-grid {
        grid-template-columns: 1fr;
    }
    
    .data-stats {
        flex-wrap: wrap;
        gap: 30px;
    }
    
    .stat-item {
        flex: 1 1 40%;
    }
    
    .stat-number {
        font-size: 40px;
    }
    
    .cta-section h2 {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-text h1 {
        font-size: 28px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .btn-large {
        padding: 16px 32px;
        font-size: 16px;
    }
}