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

/* 基础样式 */
body {
    font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

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

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    color: #2C3E50;
    font-size: 24px;
}

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

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #E8B86D;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(45deg, #E8B86D, #F39C12);
    transition: width 0.3s ease;
}

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

.nav-item {
    position: relative;
    list-style: none;
}

.nav-item.dropdown > .nav-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.nav-item.dropdown > .nav-link::before {
    content: '\25BE';
    font-size: 0.65rem;
    color: rgba(255, 255, 255, 0.7);
    transition: transform 0.3s ease, color 0.3s ease;
}

.nav-item.dropdown:hover > .nav-link::before,
.nav-item.dropdown:focus-within > .nav-link::before {
    transform: rotate(180deg);
    color: #f7b731;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    min-width: 200px;
    background: rgba(255, 255, 255, 0.98);
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
    padding: 12px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.24s ease, transform 0.24s ease, visibility 0s linear 0.24s;
    pointer-events: none;
    z-index: 999;
}

.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -12px;
    left: 0;
    right: 0;
    height: 12px;
}

.nav-item.dropdown:hover .dropdown-menu,
.nav-item.dropdown:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
    transition-delay: 0s, 0s, 0s;
}

.dropdown-menu li {
    list-style: none;
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    color: #2c3e50;
    font-weight: 500;
    font-size: 0.95rem;
    text-decoration: none;
    transition: background 0.3s ease, color 0.3s ease;
}

.dropdown-menu a::after {
    display: none;
}

.dropdown-menu a:hover {
    background: rgba(46, 213, 115, 0.08);
    color: #2c3e50;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* 英雄区域样式 */
.hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
}

.hero-bg-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    animation: slowZoom 20s ease-in-out infinite alternate;
}

@keyframes slowZoom {
    0% { transform: scale(1); }
    100% { transform: scale(1.1); }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.8), rgba(44, 62, 80, 0.4));
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    padding: 0 20px;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 1s ease-out 0.3s both;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 40px;
    opacity: 0.9;
    animation: fadeInUp 1s ease-out 0.6s both;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease-out 0.9s both;
}

/* 首页英雄区域增强布局 */
.hero {
    min-height: 100vh;
    padding: 120px 0;
    align-items: center;
    text-align: left;
    justify-content: center;
}

.hero-container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 60px;
    align-items: center;
}

.hero-intro {
    max-width: 520px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 18px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    font-size: 0.9rem;
    letter-spacing: 1px;
    backdrop-filter: blur(6px);
}

.hero-title {
    margin-bottom: 0;
    font-size: 3.6rem;
    line-height: 1.08;
}

.hero-subtitle {
    margin: 0;
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.85);
}

.hero-actions {
    justify-content: flex-start;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin-top: 12px;
}

.hero-stat-card {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 16px;
    padding: 20px;
    text-align: center;
    backdrop-filter: blur(8px);
}

.hero-stat-card .stat-number {
    display: block;
    font-size: 2.4rem;
    font-weight: 700;
    color: #f7b731;
}

.hero-stat-card .stat-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

.hero-sidepanel {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.highlight-card {
    background: rgba(248, 249, 250, 0.96);
    color: #2c3e50;
    border-radius: 20px;
    padding: 32px;
    box-shadow: 0 25px 35px rgba(0, 0, 0, 0.12);
}

/* 核心优势区域 */
.advantages {
    padding: 90px 0;
    background: linear-gradient(180deg, #ffffff 0%, #f7f8fc 100%);
}

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 28px;
}

.advantage-card {
    background: #fff;
    border-radius: 18px;
    padding: 32px 28px;
    box-shadow: 0 20px 35px rgba(44, 62, 80, 0.08);
    border: 1px solid rgba(232, 184, 109, 0.18);
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.advantage-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 28px 55px rgba(44, 62, 80, 0.12);
}

.advantage-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(232, 184, 109, 0.25), rgba(243, 156, 18, 0.4));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
}

.advantage-card h3 {
    font-size: 1.2rem;
    color: #2c3e50;
    margin: 0;
}

.advantage-card p {
    color: #5f6c7b;
    line-height: 1.7;
    margin: 0;
}

.advantage-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 8px;
    color: #2c3e50;
    font-size: 0.95rem;
}

.advantage-list li {
    position: relative;
    padding-left: 18px;
}

.advantage-list li::before {
    content: '';
    position: absolute;
    top: 9px;
    left: 0;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: linear-gradient(135deg, #E8B86D, #F39C12);
}

/* 项目流程区域 */
.process {
    padding: 90px 0;
    background: #ffffff;
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
}

.process-step {
    background: #fff;
    border-radius: 18px;
    padding: 28px;
    box-shadow: 0 18px 35px rgba(44, 62, 80, 0.08);
    border: 1px solid rgba(91, 105, 135, 0.08);
    display: flex;
    flex-direction: column;
    gap: 14px;
    position: relative;
}

.process-step ul {
    list-style: none;
    padding: 0;
    margin: 0;
    color: #5f6c7b;
    display: grid;
    gap: 6px;
    font-size: 0.92rem;
}

.process-step ul li {
    position: relative;
    padding-left: 16px;
}

.process-step ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: #E8B86D;
}

.process-step h3 {
    margin: 0;
    font-size: 1.2rem;
    color: #2c3e50;
}

.process-step p {
    margin: 0;
    color: #5f6c7b;
    line-height: 1.7;
}

.step-index {
    width: 48px;
    height: 48px;
    border-radius: 16px;
    background: linear-gradient(135deg, #E8B86D, #F39C12);
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 行动召集区域 */
.cta-banner {
    padding: 80px 0;
    background: linear-gradient(120deg, rgba(44, 62, 80, 0.92), rgba(232, 184, 109, 0.85));
    color: #fff;
}

.cta-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    flex-wrap: wrap;
}

.cta-text h2 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.cta-text p {
    margin: 0;
    font-size: 1.05rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.85);
}

.cta-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.cta-actions .btn {
    padding: 14px 28px;
    font-size: 1rem;
}

.highlight-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.highlight-card p {
    color: #5f6c7b;
    line-height: 1.7;
    margin-bottom: 18px;
}

.highlight-card ul {
    list-style: none;
    padding: 0;
    margin: 0 0 20px;
    display: grid;
    gap: 10px;
}

.highlight-card ul li {
    position: relative;
    padding-left: 18px;
    font-weight: 500;
    color: #2c3e50;
}

.highlight-card ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #E8B86D;
}

.panel-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #c7862d;
    font-weight: 600;
    text-decoration: none;
}

.panel-link::after {
    content: '\2192';
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.panel-link:hover::after {
    transform: translateX(4px);
}

.contact-card {
    background: linear-gradient(135deg, rgba(232, 184, 109, 0.2), rgba(243, 156, 18, 0.45));
    border: 1px solid rgba(255, 255, 255, 0.35);
}

.contact-card h4 {
    font-size: 1.25rem;
    margin-bottom: 6px;
}

.contact-card p {
    margin: 0 0 18px;
    color: rgba(44, 62, 80, 0.85);
}

.contact-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.pill-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 22px;
    border-radius: 999px;
    background: #2c3e50;
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.pill-button:hover {
    background: #1f2a36;
    transform: translateY(-2px);
}

.pill-button.pill-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: #2c3e50;
    border: 1px solid rgba(44, 62, 80, 0.18);
}

.pill-button.pill-secondary:hover {
    background: rgba(255, 255, 255, 0.35);
}

.btn {
    display: inline-block;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 16px;
}

.btn-primary {
    background: linear-gradient(45deg, #E8B86D, #F39C12);
    color: white;
    box-shadow: 0 4px 15px rgba(232, 184, 109, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(232, 184, 109, 0.6);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #2C3E50;
    transform: translateY(-3px);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

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

.scroll-arrow {
    width: 30px;
    height: 30px;
    border: 2px solid white;
    border-top: none;
    border-left: none;
    transform: rotate(45deg);
}

/* 通用区域样式 */
section {
    padding: 100px 0;
}

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

.section-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: #2C3E50;
    margin-bottom: 20px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(45deg, #E8B86D, #F39C12);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

/* 业务介绍区域样式 */
.services {
    background: #f8f9fa;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.service-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.service-image {
    position: relative;
    height: 250px;
    overflow: hidden;
}

.service-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.service-card:hover .service-image img {
    transform: scale(1.1);
}

.service-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.8), rgba(232, 184, 109, 0.8));
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.service-card:hover .service-overlay {
    opacity: 1;
}

.service-icon {
    font-size: 3rem;
    animation: pulse 2s infinite;
}

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

.service-content {
    padding: 30px;
}

.service-content h3 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: #2C3E50;
    margin-bottom: 15px;
}

.service-content p {
    color: #666;
    margin-bottom: 20px;
    line-height: 1.8;
}

.service-link {
    color: #E8B86D;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.service-link:hover {
    color: #F39C12;
}

/* 项目案例区域样式 */
.portfolio {
    background: white;
}

.portfolio-filters {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 12px 24px;
    background: transparent;
    border: 2px solid #E8B86D;
    color: #E8B86D;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
    background: linear-gradient(45deg, #E8B86D, #F39C12);
    color: white;
    transform: translateY(-2px);
}

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

.portfolio-item {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.portfolio-link {
    display: block;
    height: 100%;
    color: inherit;
    text-decoration: none;
}

.portfolio-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

.portfolio-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.portfolio-item:hover img {
    transform: scale(1.1);
}

.portfolio-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(44, 62, 80, 0.9));
    color: white;
    padding: 30px 20px 20px;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

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

.portfolio-overlay h4 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.portfolio-overlay p {
    color: #E8B86D;
    font-size: 0.9rem;
}

/* 关于我们区域样式 */
.about {
    background: #f8f9fa;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text .section-title {
    text-align: left;
    margin-bottom: 30px;
}

.about-text .section-title::after {
    left: 0;
    transform: none;
}

.about-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #666;
    margin-bottom: 30px;
}

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

.stat-item {
    text-align: center;
}

.stat-number {
    font-family: 'Montserrat', sans-serif;
    font-size: 3rem;
    font-weight: 700;
    color: #E8B86D;
    display: block;
}

.stat-label {
    color: #666;
    font-size: 0.9rem;
    margin-top: 5px;
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* 联系我们区域样式 */
.contact {
    background: white;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    margin-top: 60px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 40px;
}

.contact-icon {
    font-size: 2rem;
    width: 60px;
    height: 60px;
    background: linear-gradient(45deg, #E8B86D, #F39C12);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-details h4 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.2rem;
    font-weight: 600;
    color: #2C3E50;
    margin-bottom: 10px;
}

.contact-details p {
    color: #666;
    line-height: 1.6;
}

.contact-form {
    background: #f8f9fa;
    padding: 40px;
    border-radius: 20px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s ease;
    background: white;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #E8B86D;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* 页脚样式 */
.footer {
    background: #2C3E50;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
    font-family: 'Montserrat', sans-serif;
    margin-bottom: 20px;
    color: #E8B86D;
}

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

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

.footer-section ul li a {
    color: #bbb;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #E8B86D;
}

.footer-section p {
    color: #bbb;
    line-height: 1.6;
    margin-bottom: 10px;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 20px;
    text-align: center;
    color: #bbb;
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(45deg, #E8B86D, #F39C12);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(232, 184, 109, 0.4);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 20px 0;
    }

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

    .nav-menu li {
        margin: 15px 0;
    }

    .nav-item.dropdown {
        width: 100%;
    }

    .nav-item.dropdown > .nav-link {
        justify-content: center;
    }

    .nav-item.dropdown > .nav-link::before {
        display: none;
    }

    .nav-item.dropdown .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        pointer-events: auto;
        box-shadow: none;
        background: transparent;
        padding: 0;
        margin-top: 8px;
    }

    .nav-item.dropdown .dropdown-menu a {
        padding: 8px 0;
        color: #2c3e50;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

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

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero {
        padding: 100px 0 80px;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-actions {
        justify-content: flex-start;
    }

    .hero-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .hero-sidepanel {
        order: -1;
    }

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

    .services-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .portfolio-grid {
        grid-template-columns: 1fr;
    }

    .advantage-grid {
        grid-template-columns: 1fr;
    }

    .advantage-card {
        padding: 28px 24px;
    }

    .process-grid {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-stats {
        justify-content: space-around;
        gap: 20px;
    }

    .stat-number {
        font-size: 2.5rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .section-title {
        font-size: 2rem;
    }

    .cta-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .cta-actions {
        width: 100%;
    }

    .cta-actions .btn {
        flex: 1;
        min-width: 200px;
        text-align: center;
    }

    section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

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

    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .service-card {
        margin: 0 10px;
    }

    .portfolio-filters {
        gap: 10px;
    }

    .filter-btn {
        padding: 8px 16px;
        font-size: 14px;
    }

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

    .contact-form {
        padding: 20px;
    }

    .cta-actions {
        gap: 12px;
    }

    .cta-actions .btn {
        width: 100%;
        min-width: 0;
    }
}

/* 动画类 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 隐藏类用于筛选 */
.portfolio-item.hidden {
    display: none;
}

/* 加载动画 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.portfolio-item {
    animation: fadeIn 0.5s ease-in-out;
}