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

:root {
    --primary-color: #1a73e8;
    --secondary-color: #34a853;
    --text-dark: #202124;
    --text-medium: #5f6368;
    --text-light: #9aa0a6;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --gradient-primary: linear-gradient(135deg, #1a73e8 0%, #34a853 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-white);
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 40px;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    transition: var(--transition);
}

header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
}

.logo {
    font-size: 28px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 48px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 15px;
    position: relative;
    padding: 8px 0;
    transition: var(--transition);
}

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

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

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    z-index: 1001;
}

.mobile-menu-btn span {
    width: 28px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0.05;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(26, 115, 232, 0.1) 0%, transparent 50%);
    animation: pulse 15s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 120px 0;
}

.hero-title {
    font-size: 84px;
    font-weight: 800;
    letter-spacing: -3px;
    margin-bottom: 16px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 32px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-medium);
    max-width: 600px;
    margin: 0 auto 60px;
    line-height: 1.8;
}

.hero-scroll {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-light);
    font-size: 14px;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    transform: rotate(45deg);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0) rotate(45deg); }
    40% { transform: translateY(10px) rotate(45deg); }
    60% { transform: translateY(5px) rotate(45deg); }
}

.section {
    padding: 120px 0;
}

.section:nth-child(even) {
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-tag {
    display: inline-block;
    padding: 8px 20px;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.1) 0%, rgba(52, 168, 83, 0.1) 100%);
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 600;
    border-radius: 50px;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-dark);
    letter-spacing: -1px;
}

.about-content {
    max-width: 900px;
    margin: 0 auto 80px;
    text-align: center;
}

.about-text p {
    font-size: 18px;
    color: var(--text-medium);
    line-height: 2;
    margin-bottom: 20px;
}

.milestone-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.milestone-item {
    text-align: center;
    padding: 40px 24px;
    background: var(--bg-white);
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.milestone-year {
    font-size: 14px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.milestone-item h4 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.milestone-item p {
    font-size: 14px;
    color: var(--text-medium);
    line-height: 1.7;
}

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

.tech-card {
    background: var(--bg-white);
    padding: 56px 40px;
    border-radius: 24px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

.tech-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-lg);
}

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

.tech-icon {
    width: 72px;
    height: 72px;
    margin-bottom: 32px;
    color: var(--primary-color);
}

.tech-card h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.tech-card p {
    font-size: 15px;
    color: var(--text-medium);
    line-height: 1.8;
}

.values-wrapper {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.value-item {
    position: relative;
    padding: 48px 32px;
}

.value-number {
    font-size: 72px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 20px;
    opacity: 0.3;
}

.value-item h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.value-item p {
    font-size: 15px;
    color: var(--text-medium);
    line-height: 1.8;
}

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

.compliance-card {
    background: var(--bg-white);
    padding: 56px 40px;
    border-radius: 24px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
}

.compliance-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.compliance-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 32px;
    color: var(--primary-color);
}

.compliance-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 24px;
}

.compliance-placeholder {
    background: var(--bg-light);
    border: 2px dashed #dadce0;
    border-radius: 16px;
    padding: 48px 24px;
}

.compliance-placeholder p {
    font-size: 16px;
    color: var(--text-medium);
    margin-bottom: 12px;
    font-weight: 500;
}

.compliance-placeholder span {
    font-size: 13px;
    color: var(--text-light);
}

.compliance-placeholder a {
    color: var(--primary-color);
    text-decoration: none;
}

.compliance-placeholder a:hover {
    text-decoration: underline;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-item {
    text-align: center;
    padding: 56px 40px;
    background: var(--bg-white);
    border-radius: 24px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.contact-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 32px;
    color: var(--primary-color);
}

.contact-item h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.contact-item p {
    font-size: 16px;
    color: var(--text-medium);
}

footer {
    background: var(--text-dark);
    color: var(--bg-white);
    padding: 80px 0 40px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 15px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--bg-white);
}

.footer-compliance {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 40px;
    border-top: 1px solid #3c4043;
}

.footer-compliance p {
    color: var(--text-light);
    margin-bottom: 12px;
    font-size: 14px;
}

.footer-compliance a {
    color: #8ab4f8;
    text-decoration: none;
}

.footer-compliance a:hover {
    text-decoration: underline;
}

.footer-copyright {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid #3c4043;
    color: var(--text-light);
    font-size: 13px;
}

@media (max-width: 1200px) {
    .milestone-grid,
    .values-wrapper {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .tech-grid,
    .compliance-grid,
    .contact-wrapper {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-title {
        font-size: 64px;
    }
    
    .hero-subtitle {
        font-size: 26px;
    }
    
    .section-title {
        font-size: 38px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 24px;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: var(--bg-white);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        transition: var(--transition);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links a {
        font-size: 20px;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-title {
        font-size: 48px;
        letter-spacing: -1.5px;
    }
    
    .hero-subtitle {
        font-size: 22px;
    }
    
    .hero-desc {
        font-size: 16px;
    }
    
    .section {
        padding: 80px 0;
    }
    
    .section-header {
        margin-bottom: 56px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .milestone-grid,
    .tech-grid,
    .values-wrapper,
    .compliance-grid,
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        gap: 24px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 40px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .tech-card,
    .compliance-card,
    .contact-item {
        padding: 40px 24px;
    }
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal.active {
    display: flex;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--bg-white);
    border-radius: 24px;
    max-width: 480px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s ease;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 28px 32px;
    border-bottom: 1px solid #f0f0f0;
}

.modal-header h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
}

.modal-close {
    font-size: 32px;
    line-height: 1;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.modal-close:hover {
    color: var(--text-dark);
    background: var(--bg-light);
}

.modal-body {
    padding: 40px 32px;
}

.contact-info-modal {
    text-align: center;
}

.contact-icon-modal {
    width: 80px;
    height: 80px;
    margin: 0 auto 28px;
    color: var(--primary-color);
}

.contact-info-modal h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.contact-email {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 12px;
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
    padding: 12px 24px;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.1) 0%, rgba(52, 168, 83, 0.1) 100%);
    border-radius: 12px;
}

.contact-email:hover {
    transform: scale(1.05);
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.15) 0%, rgba(52, 168, 83, 0.15) 100%);
}

.contact-hint {
    font-size: 14px;
    color: var(--text-light);
}

@media (max-width: 480px) {
    .modal-header {
        padding: 24px;
    }
    
    .modal-body {
        padding: 32px 24px;
    }
    
    .contact-email {
        font-size: 18px;
    }
}