/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary-color: #0066cc;
    --secondary-color: #00aaff;
    --dark-blue: #003366;
    --light-blue: #e6f7ff;
    --gray-light: #f5f5f5;
    --gray: #cccccc;
    --gray-dark: #333333;
    --white: #ffffff;
    --black: #000000;
}

body {
    color: var(--gray-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3, h4 {
    font-weight: 600;
    margin-bottom: 1rem;
}

h2 {
    font-size: 2rem;
    color: var(--dark-blue);
    text-align: center;
    margin-bottom: 2rem;
    position: relative;
}

h2::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--primary-color);
    margin: 10px auto 0;
    border-radius: 2px;
}

p {
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

a:hover {
    color: var(--secondary-color);
}

.btn {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 10px 20px;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.btn:hover {
    background: var(--secondary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* 导航栏 */
.navbar {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    margin-right: 10px;
}

.logo h1 {
    font-size: 1.5rem;
    color: var(--dark-blue);
    margin: 0;
}

.nav-links ul {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 25px;
}

.nav-links a {
    color: var(--gray-dark);
    font-weight: 500;
    padding: 5px 0;
    position: relative;
}

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

.nav-links a.active::after {
    content: '';
    display: block;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
    position: absolute;
    bottom: 0;
    left: 0;
}

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

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-dark);
}

/* 移动端菜单 */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background: var(--white);
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
    z-index: 1001;
    transition: right 0.3s ease;
    padding: 20px;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu ul {
    list-style: none;
    margin-top: 60px;
}

.mobile-menu li {
    margin-bottom: 20px;
}

.mobile-menu a {
    color: var(--gray-dark);
    font-size: 1.2rem;
    display: block;
    padding: 10px 0;
    border-bottom: 1px solid var(--gray-light);
}

/* 首页横幅 */
.hero {
    background-image: url('https://p9-flow-imagex-sign.byteimg.com/tos-cn-i-a9rns2rl98/rc/pc/super_tool/39c24e208ec4461d913693429078651f~tplv-a9rns2rl98-image.image?rcl=20251016122104DAF0B110C51DC7E1BCCD&rk3s=8e244e95&rrcfp=f06b921b&x-expires=1763180489&x-signature=jInGBmXhqw4M4oTU3SbHxuOURTw%3D');
    background-size: cover;
    background-position: center;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    position: relative;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: 0 20px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--white);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* 关于我们 */
.about {
    padding: 5rem 0;
    background: var(--white);
}

.about-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}

.about-text {
    flex: 1;
    min-width: 300px;
    padding-right: 2rem;
}

.about-stats {
    flex: 1;
    min-width: 300px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}

.stat-item {
    text-align: center;
    padding: 20px;
    margin: 10px;
    background: var(--light-blue);
    border-radius: 10px;
    flex: 1;
    min-width: 120px;
}

.stat-item h3 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* 技术栈 */
.tech-stack {
    padding: 5rem 0;
    background: var(--gray-light);
}

.tech-categories {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.tech-btn {
    background: var(--white);
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 8px 16px;
    margin: 0 10px 10px 0;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

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

.tech-items {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.tech-item {
    background: var(--white);
    border-radius: 10px;
    padding: 20px;
    margin: 15px;
    width: calc(33.333% - 30px);
    min-width: 250px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    text-align: center;
}

.tech-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.tech-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.tech-chart {
    margin-top: 3rem;
    background: var(--white);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.tech-chart h3 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--dark-blue);
}

/* 学习历程时间轴 */
.timeline {
    padding: 5rem 0;
    background: var(--white);
}

.timeline-container {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
}

.timeline-container::after {
    content: '';
    position: absolute;
    width: 6px;
    background-color: var(--primary-color);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -3px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    width: 50%;
    box-sizing: border-box;
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 25px;
    height: 25px;
    right: -17px;
    background-color: var(--white);
    border: 4px solid var(--secondary-color);
    top: 15px;
    border-radius: 50%;
    z-index: 1;
}

.timeline-item:nth-child(odd) {
    left: 0;
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-content {
    padding: 20px;
    background-color: var(--light-blue);
    position: relative;
    border-radius: 6px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.timeline-content h3 {
    color: var(--dark-blue);
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* 联系我们 */
.contact {
    padding: 5rem 0;
    background: var(--gray-light);
}

.contact-form-container {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
}

.contact-form {
    flex: 1;
    min-width: 300px;
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.form-group {
    margin-bottom: 1.5rem;
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--gray);
    border-radius: 5px;
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.2);
}

.contact-info {
    flex: 1;
    min-width: 300px;
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.contact-info h3 {
    color: var(--dark-blue);
    margin-bottom: 1.5rem;
}

.contact-info p {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

.contact-info i {
    color: var(--primary-color);
    margin-right: 10px;
    font-size: 1.2rem;
}

.social-links {
    margin-top: 2rem;
}

.social-links a {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: var(--light-blue);
    color: var(--primary-color);
    border-radius: 50%;
    text-align: center;
    line-height: 40px;
    margin-right: 10px;
    transition: all 0.3s ease;
}

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

/* 页脚 */
.footer {
    background: var(--dark-blue);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.footer-logo {
    flex: 1;
    min-width: 250px;
    margin-bottom: 2rem;
}

.footer-logo img {
    height: 50px;
    margin-bottom: 1rem;
}

.footer-logo h3 {
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-links {
    flex: 1;
    min-width: 200px;
    margin-bottom: 2rem;
}

.footer-links h4 {
    color: var(--white);
    margin-bottom: 1rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.footer-links h4::after {
    content: '';
    display: block;
    width: 40px;
    height: 2px;
    background: var(--secondary-color);
    position: absolute;
    bottom: 0;
    left: 0;
}

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

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--gray);
}

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

.footer-newsletter {
    flex: 1;
    min-width: 250px;
    margin-bottom: 2rem;
}

.footer-newsletter h4 {
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-newsletter p {
    color: var(--gray);
    margin-bottom: 1rem;
}

.newsletter-form {
    display: flex;
}

.newsletter-form input {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 5px 0 0 5px;
    font-size: 1rem;
}

.newsletter-form button {
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 10px 15px;
    border-radius: 0 5px 5px 0;
    cursor: pointer;
    transition: all 0.3s ease;
}

.newsletter-form button:hover {
    background: var(--secondary-color);
}

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

.copyright {
    margin-bottom: 1rem;
    color: var(--gray);
}

.beian-info {
    color: var(--gray);
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .about-content {
        flex-direction: column;
    }

    .about-text {
        padding-right: 0;
        margin-bottom: 2rem;
    }

    .timeline-container::after {
        left: 31px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }

    .timeline-item::after {
        left: 15px;
    }

    .timeline-item:nth-child(even) {
        left: 0;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

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

    .hero p {
        font-size: 1rem;
    }

    .tech-item {
        width: calc(50% - 30px);
    }
}

@media (max-width: 576px) {
    .hero h1 {
        font-size: 2rem;
    }

    .tech-item {
        width: 100%;
    }

    .footer-content {
        flex-direction: column;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.8s ease forwards;
}

/* 滚动动画 */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

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

/* 技术栈图表容器 */
#techChart {
    width: 100%;
    height: 400px;
}