/* ========================================
   年光科技 Website - Main Stylesheet
   Modern AI Company Website Design
   ======================================== */

/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #06b6d4;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --text-muted: #9ca3af;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-dark: #0a0f1c;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
    --gradient-dark: linear-gradient(135deg, #0a0f1c 0%, #1a1f3a 100%);
    --gradient-cyber: linear-gradient(135deg, #00f5ff 0%, #6366f1 50%, #ff00ff 100%);
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Container */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--border-radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(99, 102, 241, 0.39);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(99, 102, 241, 0.5);
}

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

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

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

.btn-block {
    width: 100%;
}

/* Section Styles */
section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem;
}

.section-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 2rem;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
    line-height: 1.2;
}

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

.section-desc {
    font-size: 1.125rem;
    color: var(--text-light);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
}

.nav-brand a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
}

.logo-img {
    height: 40px;
    width: auto;
    border-radius: 8px;
}

.logo-icon {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--border-radius-md);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-light);
    position: relative;
    padding: 0.5rem 0;
}

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

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-dark);
    cursor: pointer;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--bg-dark);
    overflow: hidden;
    padding-top: 4rem;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-dark);
}

.gradient-overlay {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 30%, rgba(99, 102, 241, 0.25) 0%, transparent 40%),
        radial-gradient(ellipse at 80% 70%, rgba(6, 182, 212, 0.2) 0%, transparent 40%),
        radial-gradient(ellipse at 50% 50%, rgba(139, 92, 246, 0.15) 0%, transparent 50%);
}

/* 科技感网格背景 */
.tech-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: perspective(500px) rotateX(60deg) translateY(0); }
    100% { transform: perspective(500px) rotateX(60deg) translateY(50px); }
}

/* 扫描线效果 */
.scan-line {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(0, 245, 255, 0.5), transparent);
    animation: scan 4s linear infinite;
    z-index: 2;
}

@keyframes scan {
    0% { top: 0; opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { top: 100%; opacity: 0; }
}

/* 霓虹光晕效果 */
.neon-glow {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: neonPulse 4s ease-in-out infinite;
}

.neon-glow-1 {
    background: radial-gradient(circle, rgba(99, 102, 241, 0.6) 0%, transparent 70%);
    top: 20%;
    left: 10%;
}

.neon-glow-2 {
    background: radial-gradient(circle, rgba(6, 182, 212, 0.5) 0%, transparent 70%);
    bottom: 20%;
    right: 10%;
    animation-delay: 2s;
}

@keyframes neonPulse {
    0%, 100% { transform: scale(1); opacity: 0.4; }
    50% { transform: scale(1.2); opacity: 0.6; }
}

.particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

/* Canvas for mouse interaction */
.hero-canvas {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 3;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.4);
    border-radius: 2rem;
    color: #a5b4fc;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: white;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    text-shadow: 0 0 40px rgba(99, 102, 241, 0.3);
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    gap: 3rem;
    margin-bottom: 2.5rem;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: white;
    text-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
}

.stat-suffix {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-light);
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 0.25rem;
}

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

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

.ai-visualization {
    position: relative;
    width: 400px;
    height: 400px;
    z-index: 3;
}

.brain-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.brain-core {
    width: 120px;
    height: 120px;
    background: var(--gradient-primary);
    border-radius: 50%;
    position: relative;
    z-index: 2;
    box-shadow: 
        0 0 60px rgba(99, 102, 241, 0.6),
        0 0 100px rgba(99, 102, 241, 0.3),
        inset 0 0 30px rgba(255, 255, 255, 0.1);
    animation: pulse 2s ease-in-out infinite;
}

.brain-core::before {
    content: '';
    position: absolute;
    inset: -10px;
    border-radius: 50%;
    background: conic-gradient(from 0deg, transparent, rgba(99, 102, 241, 0.3), transparent);
    animation: rotate 3s linear infinite;
}

.brain-core::after {
    content: '';
    position: absolute;
    inset: -20px;
    border-radius: 50%;
    border: 1px solid rgba(99, 102, 241, 0.2);
    animation: pulse-ring 2s ease-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.9; }
}

@keyframes pulse-ring {
    0% { transform: scale(1); opacity: 0.5; }
    100% { transform: scale(1.3); opacity: 0; }
}

.orbit {
    position: absolute;
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

.orbit-1 {
    width: 200px;
    height: 200px;
    animation-duration: 15s;
}

.orbit-2 {
    width: 280px;
    height: 280px;
    animation-duration: 25s;
    animation-direction: reverse;
}

.orbit-3 {
    width: 360px;
    height: 360px;
    animation-duration: 35s;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.floating-icons {
    position: absolute;
    inset: 0;
}

.floating-icons i {
    position: absolute;
    font-size: 1.5rem;
    color: var(--primary-light);
    opacity: 0.7;
}

.floating-icons i:nth-child(1) { top: 10%; left: 20%; animation: float 3s ease-in-out infinite; }
.floating-icons i:nth-child(2) { top: 20%; right: 15%; animation: float 3s ease-in-out infinite 0.5s; }
.floating-icons i:nth-child(3) { bottom: 20%; left: 15%; animation: float 3s ease-in-out infinite 1s; }
.floating-icons i:nth-child(4) { bottom: 10%; right: 25%; animation: float 3s ease-in-out infinite 1.5s; }

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

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

.mouse {
    width: 24px;
    height: 36px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 12px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 2px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 1.5s ease-in-out infinite;
}

@keyframes scroll {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

/* ========================================
   About Section
   ======================================== */
.about {
    background: var(--bg-light);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 4rem;
}

.about-card {
    background: white;
    padding: 2.5rem;
    border-radius: var(--border-radius-xl);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    font-size: 2rem;
    border-radius: 50%;
}

.about-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.about-card p {
    color: var(--text-light);
    line-height: 1.6;
}

.timeline-section {
    background: white;
    padding: 3rem;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-sm);
}

.timeline-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-dark);
}

.timeline {
    display: flex;
    justify-content: space-between;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.timeline-item {
    text-align: center;
    position: relative;
    flex: 1;
}

.timeline-year {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    color: white;
    font-weight: 700;
    font-size: 0.875rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    position: relative;
    z-index: 1;
}

.timeline-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.timeline-content p {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* ========================================
   Office Evolution Gallery
   ======================================== */
.office-evolution {
    margin-top: 3rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border-color);
}

.office-title {
    text-align: center;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 2rem;
}

.office-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.office-item {
    position: relative;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.office-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.office-image {
    position: relative;
    width: 100%;
    aspect-ratio: 4/3;
    overflow: hidden;
}

.office-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.office-item:hover .office-image img {
    transform: scale(1.05);
}

.office-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1rem;
    background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.4) 60%, transparent 100%);
    color: white;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.office-year {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-light);
}

.office-desc {
    font-size: 0.8rem;
    opacity: 0.9;
}

@media (max-width: 1024px) {
    .office-gallery {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .office-gallery {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   User Stats Section
   ======================================== */
.user-stats-section {
    background: linear-gradient(135deg, #0a0f1c 0%, #1a1f3a 100%);
    padding: 4rem 3rem;
    border-radius: var(--border-radius-xl);
    margin-top: 4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.user-stats-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
}

.user-stats-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: white;
    margin-bottom: 3rem;
    position: relative;
    z-index: 1;
}

.user-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    position: relative;
    z-index: 1;
}

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

.user-stat-number {
    font-size: 3.5rem;
    font-weight: 800;
    color: white;
    line-height: 1;
}

.user-stat-suffix {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-light);
}

.user-stat-label {
    display: block;
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 0.5rem;
}

/* ========================================
   Philosophy Section
   ======================================== */
.philosophy-section {
    background: linear-gradient(135deg, #e0f7fa 0%, #fff3e0 50%, #f3e5f5 100%);
    padding: 3rem;
    border-radius: var(--border-radius-xl);
    margin-top: 4rem;
}

.philosophy-title {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 2rem;
}

.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.philosophy-card {
    background: rgba(255, 255, 255, 0.9);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    text-align: center;
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.philosophy-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.philosophy-card h4 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.philosophy-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.philosophy-card.simple h4 { color: #00acc1; }
.philosophy-card.eternal h4 { color: #ff8f00; }
.philosophy-card.trust h4 { color: #7cb342; }
.philosophy-card.transparent h4 { color: #5c6bc0; }

/* ========================================
   Products Section
   ======================================== */
.products {
    background: white;
}

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

.product-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: var(--border-radius-xl);
    position: relative;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    overflow: hidden;
}

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

/* Product card hover reveal effect */
.product-summary {
    color: var(--text-light);
    margin-bottom: 1rem;
    transition: all var(--transition-normal);
}

.product-detail {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.product-card:hover .product-summary {
    opacity: 0;
    max-height: 0;
    margin: 0;
}

.product-card:hover .product-detail {
    max-height: 300px;
    opacity: 1;
}

.product-detail p {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.product-card.featured {
    background: var(--gradient-primary);
    color: white;
}

.product-card.featured .product-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.product-card.featured h3,
.product-card.featured p,
.product-card.featured .feature-list li {
    color: white;
}

.product-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.25rem 0.75rem;
    background: var(--accent-color);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 1rem;
}

.product-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    font-size: 1.5rem;
    border-radius: var(--border-radius-lg);
    margin-bottom: 1.5rem;
}

.product-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.product-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.feature-list {
    margin-bottom: 1.5rem;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.feature-list li i {
    color: var(--primary-color);
    font-size: 0.8rem;
}

.product-card.featured .feature-list li i {
    color: rgba(255, 255, 255, 0.8);
}

.product-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
}

.product-card.featured .product-link {
    color: white;
}

.product-link:hover {
    gap: 0.75rem;
}

/* ========================================
   Solutions Section
   ======================================== */
.solutions {
    background: var(--bg-dark);
    color: white;
}

.solutions .section-title {
    color: white;
}

.solutions .section-desc {
    color: rgba(255, 255, 255, 0.7);
}

.solutions-tabs {
    max-width: 900px;
    margin: 0 auto;
}

.tab-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-lg);
    color: rgba(255, 255, 255, 0.8);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.tab-btn:hover,
.tab-btn.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
}

.tab-btn i {
    font-size: 1.25rem;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.solution-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-xl);
    padding: 3rem;
}

.solution-icon-large {
    width: 200px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    font-size: 5rem;
    border-radius: 50%;
    margin: 0 auto;
}

.solution-info h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.solution-info p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.solution-features {
    margin-bottom: 2rem;
}

.solution-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    color: rgba(255, 255, 255, 0.9);
}

.solution-features li i {
    color: var(--secondary-color);
}

/* ========================================
   Cases Section
   ======================================== */
.cases {
    background: var(--bg-light);
}

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

.case-card {
    background: white;
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.case-logo {
    height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    font-size: 4rem;
}

.case-content {
    padding: 2rem;
}

.case-industry {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 1rem;
    margin-bottom: 1rem;
}

.case-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.case-content p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.case-stats {
    display: flex;
    gap: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

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

.case-number {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary-color);
}

.case-label {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* ========================================
   Strength Section
   ======================================== */
.strength {
    background: white;
}

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

.strength-card {
    background: var(--bg-light);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.strength-card:hover {
    box-shadow: var(--shadow-lg);
}

.strength-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--gradient-primary);
    color: white;
}

.strength-header i {
    font-size: 1.5rem;
}

.strength-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
}

.strength-content {
    padding: 1.5rem;
}

.tech-stack {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tech-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    position: relative;
}

.tech-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-dark);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.tech-percent {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-color);
}

.tech-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.tech-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
    transition: width 1s ease;
}

.team-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 1rem;
}

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

.team-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
}

.team-label {
    font-size: 0.875rem;
    color: var(--text-light);
}

.team-desc {
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

.achievement-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.achievement-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-dark);
}

.achievement-list li i {
    color: var(--accent-color);
}

.partner-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.partner-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: white;
    border-radius: var(--border-radius-md);
    color: var(--text-light);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.partner-item:hover {
    background: var(--primary-color);
    color: white;
}

.partner-item i {
    font-size: 1.5rem;
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    background: var(--gradient-primary);
    padding: 5rem 0;
    text-align: center;
    color: white;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.cta-buttons .btn-outline {
    border-color: white;
    color: white;
}

.cta-buttons .btn-outline:hover {
    background: white;
    color: var(--primary-color);
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    background: var(--bg-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

.contact-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    font-size: 1.25rem;
    border-radius: var(--border-radius-md);
    flex-shrink: 0;
}

.contact-detail h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.contact-detail p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
}

.contact-form-wrapper {
    background: white;
    padding: 2.5rem;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-sm);
}

.contact-form h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: 0.95rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-logo-img {
    height: 36px;
    width: auto;
    border-radius: 8px;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.icp-link {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.icp-link:hover {
    color: var(--primary-light);
    text-decoration: underline;
}

.beian-info {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
}

.beian-info a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

.beian-icon {
    width: 16px;
    height: 16px;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-visual {
        display: none;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-buttons {
        justify-content: center;
    }

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

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

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

    .strength-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 4rem;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 2rem;
        gap: 1rem;
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        transition: transform var(--transition-normal);
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .mobile-toggle {
        display: block;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .about-grid,
    .products-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }

    .solution-card {
        grid-template-columns: 1fr;
    }

    .solution-icon-large {
        width: 120px;
        height: 120px;
        font-size: 3rem;
    }

    .tab-buttons {
        flex-direction: column;
        align-items: center;
    }

    .tab-btn {
        width: 200px;
        justify-content: center;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-social {
        justify-content: center;
    }

    .timeline {
        flex-direction: column;
        gap: 2rem;
    }

    .timeline::before {
        display: none;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .cta-buttons {
        flex-direction: column;
    }

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

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

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease forwards;
}

/* Scroll animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}