/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #f39c12;
    --secondary-light: #f9c74f;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --gray-color: #7f8c8d;
    --white-color: #ffffff;
    --section-padding: 80px 0;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--white-color);
}

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

/* 按钮样式 */
.btn-primary {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: var(--white-color);
    text-decoration: none;
    border-radius: 4px;
    font-weight: 500;
    transition: var(--transition);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.btn-secondary {
    display: inline-block;
    padding: 12px 24px;
    background-color: transparent;
    color: var(--primary-color);
    text-decoration: none;
    border: 1px solid var(--primary-color);
    border-radius: 4px;
    font-weight: 500;
    transition: var(--transition);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--white-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

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

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

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    color: var(--primary-dark);
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

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

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

/* 英雄区域 */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f5f9ff 0%, #e3f2fd 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle, rgba(52, 152, 219, 0.1) 0%, transparent 70%);
    z-index: 1;
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 60px;
    position: relative;
    z-index: 2;
}

.hero-content {
    flex: 1;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--dark-color);
    animation: fadeInUp 1s ease-out;
}

.hero p {
    font-size: 18px;
    color: var(--gray-color);
    margin-bottom: 30px;
    max-width: 500px;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.hero-image {
    flex: 1;
    animation: fadeInRight 1s ease-out 0.6s both;
}

.hero-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
}

.hero-image img:hover {
    transform: scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

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

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

/* 服务部分 */
.services {
    padding: var(--section-padding);
    background-color: var(--white-color);
    position: relative;
}

.services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(to bottom, #e3f2fd, transparent);
}

.services h2 {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 10px;
    color: var(--dark-color);
    position: relative;
}

.services h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: var(--gray-color);
    margin-bottom: 60px;
    font-size: 16px;
}

.service-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background-color: var(--white-color);
    padding: 40px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

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

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 28px;
    box-shadow: 0 8px 20px rgba(52, 152, 219, 0.3);
    transition: var(--transition);
}

.service-card:hover .service-icon {
    transform: scale(1.1);
    box-shadow: 0 12px 25px rgba(52, 152, 219, 0.4);
}

.service-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--dark-color);
    transition: var(--transition);
}

.service-card:hover h3 {
    color: var(--primary-color);
}

.service-card p {
    color: var(--gray-color);
    font-size: 14px;
    line-height: 1.6;
}

/* 作品集部分 */
.portfolio {
    padding: var(--section-padding);
    background-color: #f8f9fa;
    position: relative;
}

.portfolio::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(to bottom, var(--white-color), #f8f9fa);
}

.portfolio h2 {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 10px;
    color: var(--dark-color);
    position: relative;
}

.portfolio h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.portfolio-item {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.portfolio-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.portfolio-item img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.portfolio-item:hover img {
    transform: scale(1.15);
}

.portfolio-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.6), transparent);
    color: var(--white-color);
    padding: 40px 30px 30px;
    transform: translateY(100%);
    transition: transform 0.4s ease;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    height: 100%;
}

.portfolio-item:hover .portfolio-overlay {
    transform: translateY(0);
}

.portfolio-overlay h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    transform: translateY(20px);
    transition: transform 0.5s ease 0.1s;
}

.portfolio-overlay p {
    font-size: 14px;
    opacity: 0.9;
    transform: translateY(20px);
    transition: transform 0.5s ease 0.2s;
}

.portfolio-item:hover .portfolio-overlay h3,
.portfolio-item:hover .portfolio-overlay p {
    transform: translateY(0);
}

.portfolio-btn {
    display: block;
    width: fit-content;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.portfolio-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(52, 152, 219, 0.2), transparent);
    transition: left 0.6s ease;
}

.portfolio-btn:hover::before {
    left: 100%;
}

/* 设计流程部分 */
.process {
    padding: var(--section-padding);
    background-color: var(--white-color);
    position: relative;
}

.process::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(to bottom, #f8f9fa, var(--white-color));
}

.process h2 {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 10px;
    color: var(--dark-color);
    position: relative;
}

.process h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    position: relative;
}

/* 连接线 - 仅在桌面视图显示 */
@media (min-width: 768px) {
    .process-steps::before {
        content: '';
        position: absolute;
        top: 60px;
        left: 10%;
        right: 10%;
        height: 2px;
        background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
        z-index: 1;
    }
}

.process-step {
    text-align: center;
    position: relative;
    z-index: 2;
    transition: var(--transition);
}

.process-step:hover {
    transform: translateY(-5px);
}

.step-number {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 24px;
    font-weight: 700;
    box-shadow: 0 8px 20px rgba(52, 152, 219, 0.3);
    transition: var(--transition);
    position: relative;
}

.step-number::before {
    content: '';
    position: absolute;
    top: 5px;
    left: 5px;
    right: 5px;
    bottom: 5px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
}

.process-step:hover .step-number {
    transform: scale(1.1);
    box-shadow: 0 12px 25px rgba(52, 152, 219, 0.4);
}

.process-step h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--dark-color);
    transition: var(--transition);
}

.process-step:hover h3 {
    color: var(--primary-color);
}

.process-step p {
    color: var(--gray-color);
    font-size: 14px;
    line-height: 1.6;
}

/* 关于我们部分 */
.about {
    padding: var(--section-padding);
    background: linear-gradient(135deg, #f5f9ff 0%, #e3f2fd 100%);
    position: relative;
    overflow: hidden;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle, rgba(52, 152, 219, 0.1) 0%, transparent 70%);
    z-index: 1;
}

.about .container {
    display: flex;
    align-items: center;
    gap: 60px;
    position: relative;
    z-index: 2;
}

.about-content {
    flex: 1;
    animation: fadeInLeft 1s ease-out;
}

.about h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--dark-color);
    position: relative;
}

.about h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.about p {
    color: var(--gray-color);
    margin-bottom: 20px;
    font-size: 16px;
    line-height: 1.7;
}

.about-stats {
    display: flex;
    gap: 40px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    flex: 1;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    background-color: var(--white-color);
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
    display: block;
}

.stat-label {
    color: var(--gray-color);
    font-size: 14px;
    font-weight: 500;
}

.about-image {
    flex: 1;
    animation: fadeInRight 1s ease-out 0.3s both;
}

.about-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
}

.about-image img:hover {
    transform: scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 联系我们部分 */
.contact {
    padding: var(--section-padding);
    background-color: var(--white-color);
    position: relative;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(to bottom, #e3f2fd, var(--white-color));
}

.contact h2 {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 10px;
    color: var(--dark-color);
    position: relative;
}

.contact h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.contact-content {
    display: flex;
    gap: 60px;
    margin-top: 40px;
}

.contact-form {
    flex: 1;
    background-color: #f8f9fa;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.contact-form:hover {
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid rgba(52, 152, 219, 0.1);
    border-radius: 8px;
    font-size: 16px;
    font-family: 'Inter', sans-serif;
    transition: var(--transition);
    background-color: var(--white-color);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.form-group.error input,
.form-group.error textarea {
    border-color: #e74c3c;
}

.error-message {
    color: #e74c3c;
    font-size: 12px;
    margin-top: 5px;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.form-group.error .error-message {
    opacity: 1;
    transform: translateY(0);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.contact-info {
    flex: 1;
}

.info-item {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    align-items: flex-start;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 12px;
    transition: var(--transition);
}

.info-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
    background-color: var(--white-color);
}

.info-item i {
    color: var(--primary-color);
    font-size: 24px;
    margin-top: 5px;
    transition: var(--transition);
}

.info-item:hover i {
    transform: scale(1.2);
}

.info-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--dark-color);
}

.info-item p {
    color: var(--gray-color);
    font-size: 14px;
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 40px;
    justify-content: center;
}

.social-links a {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.social-links a:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 8px 20px rgba(52, 152, 219, 0.4);
}

/* 页脚 */
.footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: var(--white-color);
    padding: 80px 0 40px;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
    position: relative;
    z-index: 2;
}

.footer-logo h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--white-color);
    transition: var(--transition);
}

.footer-logo h3:hover {
    color: var(--primary-color);
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    line-height: 1.6;
}

.footer-links h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--white-color);
    position: relative;
    padding-bottom: 10px;
}

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

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

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
    position: relative;
    padding-left: 15px;
}

.footer-links a::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    transition: var(--transition);
    opacity: 0;
    transform: translateX(-10px);
}

.footer-links a:hover {
    color: var(--primary-color);
    padding-left: 20px;
}

.footer-links a:hover::before {
    opacity: 1;
    transform: translateX(0);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    position: relative;
    z-index: 2;
}

.footer-bottom p {
    transition: var(--transition);
}

.footer-bottom p:hover {
    color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--white-color);
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        flex-direction: column;
        align-items: flex-start;
        z-index: 1000;
    }

    .nav-links.active {
        display: flex;
    }

    .menu-toggle {
        display: block;
        color: var(--dark-color);
    }

    .hero .container {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero-buttons {
        justify-content: center;
        flex-direction: column;
        align-items: center;
    }

    .about .container {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }

    .about h2::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .about-stats {
        justify-content: center;
        flex-wrap: wrap;
    }

    .contact-content {
        flex-direction: column;
        gap: 40px;
    }

    .contact-form {
        padding: 30px;
    }

    .process-steps::before {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 28px;
    }

    .hero p {
        font-size: 16px;
    }

    .services h2,
    .portfolio h2,
    .process h2,
    .about h2,
    .contact h2 {
        font-size: 28px;
    }

    .service-cards,
    .portfolio-grid,
    .process-steps {
        grid-template-columns: 1fr;
    }

    .about-stats {
        flex-direction: column;
        gap: 20px;
    }

    .stat-item {
        padding: 15px;
    }

    .stat-number {
        font-size: 30px;
    }

    .footer-content {
        gap: 30px;
    }

    .social-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .social-links a {
        width: 45px;
        height: 45px;
    }

    .container {
        padding: 0 15px;
    }

    .service-card,
    .info-item {
        padding: 30px 20px;
    }
}