/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #0ea5e9;
    --text-color: #1e293b;
    --text-light: #64748b;
    --bg-color: #f8fafc;
    --white: #ffffff;
    --border-color: #e2e8f0;
    --gradient: linear-gradient(135deg, #6366f1 0%, #0ea5e9 100%);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

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

/* 导航栏 */
.navbar {
    background: var(--white);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo-icon {
    font-size: 1.8rem;
}

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

.nav-tabs {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-item {
    cursor: pointer;
    padding: 8px 0;
    color: var(--text-light);
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

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

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient);
    border-radius: 2px;
}

.btn-contact {
    background: var(--gradient);
    color: var(--white);
    padding: 10px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-contact:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

/* 主内容 */
.main-content {
    padding-top: 70px;
    min-height: calc(100vh - 70px);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

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

/* Hero区域 */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: calc(100vh - 200px);
    padding: 60px 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

.btn {
    padding: 14px 32px;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--white);
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

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

/* AI动画 */
.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

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

.circle {
    position: absolute;
    border-radius: 50%;
    border: 2px solid transparent;
}

.c1 {
    width: 100%;
    height: 100%;
    border-color: rgba(99, 102, 241, 0.3);
    animation: rotate 10s linear infinite;
}

.c2 {
    width: 75%;
    height: 75%;
    top: 12.5%;
    left: 12.5%;
    border-color: rgba(14, 165, 233, 0.4);
    animation: rotate 8s linear infinite reverse;
}

.c3 {
    width: 50%;
    height: 50%;
    top: 25%;
    left: 25%;
    border-color: rgba(99, 102, 241, 0.5);
    animation: rotate 6s linear infinite;
}

.brain-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 4rem;
    animation: pulse 2s ease-in-out infinite;
}

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

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

/* 特性区域 */
.features {
    background: var(--white);
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
    color: var(--text-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    text-align: center;
    padding: 30px 20px;
    border-radius: 16px;
    background: var(--bg-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

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

/* 页面头部 */
.page-header {
    text-align: center;
    padding: 60px 0 40px;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 16px;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-header p {
    color: var(--text-light);
    font-size: 1.1rem;
}

/* 服务网格 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    padding-bottom: 60px;
}

.service-card {
    background: var(--white);
    border-radius: 16px;
    padding: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.service-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.service-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--text-color);
}

.service-card > p {
    color: var(--text-light);
    margin-bottom: 20px;
}

.service-features {
    list-style: none;
}

.service-features li {
    padding: 8px 0;
    color: var(--text-light);
    position: relative;
    padding-left: 24px;
}

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

/* 关于我们 */
.about-content {
    padding-bottom: 60px;
}

.about-section {
    background: var(--white);
    border-radius: 16px;
    padding: 40px;
    margin-bottom: 30px;
}

.about-section h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-color);
}

.about-section p {
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.8;
}

/* 统计数据 */
.stats-section {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-bottom: 30px;
}

.stat-item {
    background: var(--white);
    border-radius: 16px;
    padding: 30px;
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    color: var(--text-light);
    font-size: 1rem;
}

/* 联系方式 */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 30px;
}

.contact-item {
    text-align: center;
    padding: 20px;
    background: var(--bg-color);
    border-radius: 12px;
}

.contact-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.contact-item h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text-color);
}

.contact-item p {
    color: var(--text-light);
    margin: 0;
}

/* 页脚 */
.footer {
    background: var(--white);
    padding: 30px 0;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.2rem;
    font-weight: 600;
}

.footer-text {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

@media (max-width: 768px) {
    .navbar .container {
        flex-wrap: wrap;
        height: auto;
        padding: 15px 20px;
    }

    .nav-tabs {
        order: 3;
        width: 100%;
        justify-content: center;
        gap: 20px;
        margin-top: 15px;
    }

    .nav-contact {
        display: none;
    }

    .hero {
        flex-direction: column;
        text-align: center;
        padding: 40px 20px;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

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

    .hero-visual {
        margin-top: 40px;
    }

    .ai-animation {
        width: 200px;
        height: 200px;
    }

    .feature-grid,
    .services-grid,
    .stats-section,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}