/* 基础变量 */
:root {
    --primary-color: #1a1a1a;
    --secondary-color: #ff3b30;
    --accent-color: #007aff;
    --text-color: #333333;
    --light-text: #ffffff;
    --gray-text: #666666;
    --background-light: #f5f5f5;
    --background-dark: #1a1a1a;
    --border-color: #e0e0e0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-light);
}

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

/* 顶部栏 */
.top-bar {
    background: linear-gradient(90deg, #ff0000, #ff6b6b);
    padding: 0.8rem 0;
    color: var(--light-text);
    font-size: 1.1rem;
    font-weight: bold;
    text-align: center;
}

.top-bar .container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.contact-info {
    display: flex;
    align-items: center;
}

.contact-info span {
    display: flex;
    align-items: center;
    color: var(--light-text);
    opacity: 1;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

.contact-info span::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--light-text);
    border-radius: 50%;
    margin-right: 0.8rem;
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
}

.social-links {
    display: none;
}

/* 导航栏 */
.main-nav {
    background-color: var(--light-text);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.main-nav.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

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

.nav-menu ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

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

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

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

/* 英雄区域 */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--background-dark));
    color: var(--light-text);
    padding: 100px 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

/* 按钮样式 */
.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--secondary-color);
    color: var(--light-text);
}

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

.btn-primary:hover {
    background-color: #e6352b;
    transform: translateY(-2px);
}

.btn-secondary:hover {
    background-color: var(--light-text);
    color: var(--primary-color);
}

/* 服务区域 */
.service-section {
    padding: 80px 0;
    background-color: var(--light-text);
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: var(--primary-color);
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.service-card {
    background-color: var(--background-light);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.service-icon {
    font-size: 40px;
    margin-bottom: 20px;
}

.service-card h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

/* 流程区域 */
.process-section {
    padding: 80px 0;
    background-color: var(--background-light);
}

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

.process-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--border-color);
    z-index: 1;
}

.process-step {
    position: relative;
    z-index: 2;
    background-color: var(--light-text);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: var(--shadow);
}

.step-number {
    width: 40px;
    height: 40px;
    background-color: var(--secondary-color);
    color: var(--light-text);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-weight: bold;
}

/* 案例区域 */
.cases-section {
    padding: 80px 0;
    background-color: var(--light-text);
}

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

.case-card {
    background-color: var(--background-light);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-5px);
}

.case-content {
    padding: 30px;
}

.case-content h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

/* 联系区域 */
.contact-section {
    padding: 80px 0;
    background-color: var(--background-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info {
    padding: 30px;
    background-color: var(--light-text);
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.contact-item {
    margin-bottom: 20px;
}

.contact-item .label {
    font-weight: 500;
    margin-right: 10px;
}

.contact-form {
    background-color: var(--light-text);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 16px;
}

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

/* 关于我们 */
.about-section {
    padding: 80px 0;
    background-color: var(--light-text);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-text ul {
    list-style: none;
    margin-top: 20px;
}

.about-text li {
    margin-bottom: 10px;
    padding-left: 25px;
    position: relative;
}

.about-text li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-item .number {
    font-size: 36px;
    font-weight: bold;
    color: var(--secondary-color);
    display: block;
    margin-bottom: 10px;
}

/* 页脚 */
.site-footer {
    background-color: var(--background-dark);
    color: var(--light-text);
    padding: 60px 0 20px;
}

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

.footer-section h4 {
    margin-bottom: 20px;
    font-size: 18px;
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section a {
    color: var(--light-text);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-content h1 {
        font-size: 36px;
    }
    
    .contact-grid,
    .about-content {
        grid-template-columns: 1fr;
    }

    .nav-menu ul {
        gap: 20px;
    }
}

@media (max-width: 768px) {
    /* 导航菜单 */
    .nav-menu {
        position: fixed;
        top: 0;
        left: -100%;
        width: 80%;
        height: 100vh;
        background-color: var(--background-dark);
        padding: 80px 20px;
        box-shadow: var(--shadow);
        transition: all 0.3s ease;
        z-index: 1000;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu ul {
        display: flex;
        flex-direction: column;
        gap: 20px;
    }

    .nav-menu a {
        color: var(--light-text);
        font-size: 18px;
        padding: 15px 0;
        display: block;
        text-align: center;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

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

    /* 汉堡菜单按钮 */
    .nav-trigger {
        display: block;
        width: 40px;
        height: 40px;
        position: relative;
        cursor: pointer;
        z-index: 1001;
    }

    .nav-trigger .line {
        position: absolute;
        width: 100%;
        height: 2px;
        background-color: var(--primary-color);
        top: 50%;
        transform: translateY(-50%);
        transition: var(--transition);
    }

    .nav-trigger .line::before,
    .nav-trigger .line::after {
        content: '';
        position: absolute;
        width: 100%;
        height: 2px;
        background-color: var(--primary-color);
        transition: var(--transition);
    }

    .nav-trigger .line::before {
        top: -8px;
    }

    .nav-trigger .line::after {
        bottom: -8px;
    }

    .nav-trigger.active .line {
        background-color: transparent;
    }

    .nav-trigger.active .line::before {
        transform: rotate(45deg);
        top: 0;
        background-color: var(--light-text);
    }

    .nav-trigger.active .line::after {
        transform: rotate(-45deg);
        bottom: 0;
        background-color: var(--light-text);
    }

    /* 头部区域优化 */
    .top-bar {
        padding: 0.5rem 0;
        font-size: 1rem;
    }

    .top-bar .container {
        padding: 0 15px;
    }

    .contact-info span {
        font-size: 0.9rem;
    }

    /* 内容区域优化 */
    .hero-section {
        padding: 60px 0;
    }

    .hero-content h1 {
        font-size: 28px;
        margin-bottom: 15px;
    }

    .hero-content p {
        font-size: 16px;
        margin-bottom: 30px;
        padding: 0 15px;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 15px;
        padding: 0 20px;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        text-align: center;
        padding: 15px 30px;
    }

    /* 服务卡片优化 */
    .service-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 0 15px;
    }

    .service-card {
        padding: 25px;
    }

    /* 流程步骤优化 */
    .process-timeline {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 0 15px;
    }

    .process-step {
        padding: 25px;
    }

    /* 案例卡片优化 */
    .cases-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 0 15px;
    }

    .case-card {
        padding: 25px;
    }

    /* 联系表单优化 */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 30px;
        padding: 0 15px;
    }

    .contact-info,
    .contact-form {
        padding: 25px;
    }

    .form-group input,
    .form-group textarea {
        padding: 15px;
        font-size: 16px;
    }

    /* 底部优化 */
    .site-footer {
        padding: 40px 0 20px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
        padding: 0 15px;
    }

    .footer-section {
        text-align: center;
    }

    .footer-section h4 {
        font-size: 18px;
        margin-bottom: 15px;
    }

    .footer-section ul {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }

    .footer-bottom {
        margin-top: 30px;
        padding-top: 20px;
    }

    .footer-bottom p {
        font-size: 14px;
    }
}

/* 小屏幕设备优化 */
@media (max-width: 480px) {
    .top-bar {
        padding: 0.4rem 0;
    }

    .contact-info span {
        font-size: 0.85rem;
    }

    .hero-content h1 {
        font-size: 24px;
    }

    .hero-content p {
        font-size: 15px;
    }

    .section-title {
        font-size: 22px;
        margin-bottom: 25px;
    }

    .service-card,
    .process-step,
    .case-card,
    .contact-info,
    .contact-form {
        padding: 20px;
    }

    .footer-section h4 {
        font-size: 16px;
    }

    .footer-section ul li {
        font-size: 14px;
    }
}

/* 横屏模式优化 */
@media (max-width: 768px) and (orientation: landscape) {
    .nav-menu {
        width: 60%;
    }

    .hero-section {
        padding: 40px 0;
    }

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

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

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

/* 触摸设备优化 */
@media (hover: none) {
    .nav-menu a,
    .btn-primary,
    .btn-secondary,
    .service-card,
    .case-card {
        -webkit-tap-highlight-color: transparent;
    }

    .service-card:active,
    .case-card:active {
        transform: scale(0.98);
    }
}

/* 打印样式优化 */
@media print {
    .nav-menu,
    .hero-buttons,
    .contact-form {
        display: none !important;
    }

    .container {
        max-width: 100%;
        padding: 0;
    }

    .service-card,
    .case-card {
        break-inside: avoid;
        box-shadow: none;
    }
}