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

/* ===== 加载动画 ===== */
.loader-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #0a0a0f 0%, #1a1a2e 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s, visibility 0.5s;
}

.loader-wrapper.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    position: relative;
    width: 200px;
    height: 200px;
}

.loader-circle {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 4px solid transparent;
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1.5s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite;
}

.loader-circle:nth-child(2) {
    border-top-color: var(--accent-color);
    animation-delay: 0.3s;
    width: 80%;
    height: 80%;
    top: 10%;
    left: 10%;
}

.loader-circle:nth-child(3) {
    border-top-color: #8b5cf6;
    animation-delay: 0.6s;
    width: 60%;
    height: 60%;
    top: 20%;
    left: 20%;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loader-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: pulse-text 1.5s ease-in-out infinite;
}

@keyframes pulse-text {
    0%, 100% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.5; transform: translate(-50%, -50%) scale(1.1); }
}

/* ===== 鼠标跟随光标 ===== */
.cursor-glow {
    position: fixed;
    width: 20px;
    height: 20px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9998;
    transition: transform 0.2s ease, opacity 0.3s;
    opacity: 0;
}

.cursor-glow.active {
    opacity: 1;
}

.cursor-glow::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    animation: cursor-pulse 1.5s infinite;
}

@keyframes cursor-pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
    50% { transform: translate(-50%, -50%) scale(1.5); opacity: 0; }
}

:root {
    --primary-color: #6366f1;
    --secondary-color: #4f46e5;
    --accent-color: #8b5cf6;
    --text-color: #ffffff;
    --text-light: #a1a1aa;
    --bg-color: #0a0a0f;
    --bg-light: #1a1a2e;
    --border-color: #2d2d44;
    --shadow: 0 8px 32px rgba(99, 102, 241, 0.15);
    --shadow-lg: 0 20px 60px rgba(99, 102, 241, 0.3);
    --glow: 0 0 20px rgba(99, 102, 241, 0.5);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #ffffff;
    background: linear-gradient(135deg, #0a0a0f 0%, #1a1a2e 50%, #16213e 100%);
    background-attachment: fixed;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 0;
    pointer-events: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 1;
}

.section {
    padding: 100px 0;
    position: relative;
    z-index: 1;
}

.bg-light {
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.8) 0%, rgba(22, 33, 62, 0.8) 100%);
    backdrop-filter: blur(10px);
    position: relative;
}

.bg-light::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(45deg, transparent 30%, rgba(99, 102, 241, 0.03) 50%, transparent 70%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0%, 100% { transform: translateX(-100%); }
    50% { transform: translateX(100%); }
}

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(99, 102, 241, 0.2);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    transition: var(--transition);
}

.header::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.header:hover::before {
    opacity: 1;
}

.navbar {
    padding: 1rem 0;
}

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

.logo h1 {
    font-size: 1.8rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    letter-spacing: 1px;
    position: relative;
    animation: glow 2s ease-in-out infinite;
}

@keyframes glow {
    0%, 100% { filter: drop-shadow(0 0 5px rgba(99, 102, 241, 0.5)); }
    50% { filter: drop-shadow(0 0 20px rgba(139, 92, 246, 0.8)); }
}

.logo span {
    color: var(--accent-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px var(--primary-color);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    text-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

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

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

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 3px 0;
    transition: var(--transition);
}

/* ===== 首页轮播 ===== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    margin-top: 70px;
    overflow: hidden;
}

.hero-slider {
    position: relative;
    height: 100%;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hero-slide:nth-child(2) {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.hero-slide:nth-child(3) {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.hero-slide.active {
    opacity: 1;
}

.hero-content {
    text-align: center;
    color: white;
    z-index: 10;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease 0.2s backwards;
}

.slider-controls {
    position: absolute;
    top: 50%;
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 2rem;
    transform: translateY(-50%);
    z-index: 20;
}

.slider-btn {
    background-color: rgba(255, 255, 255, 0.3);
    border: none;
    color: white;
    font-size: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.slider-btn:hover {
    background-color: rgba(255, 255, 255, 0.5);
}

.slider-dots {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1rem;
    z-index: 20;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background-color: white;
    width: 30px;
    border-radius: 6px;
}

/* ===== 按钮样式 ===== */
.btn {
    display: inline-block;
    padding: 14px 40px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 50px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
    z-index: -1;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.6), var(--glow);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    color: white;
    border: 2px solid transparent;
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.4);
}

.btn-secondary:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 12px 40px rgba(139, 92, 246, 0.6);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-block {
    width: 100%;
}

/* ===== 章节标题 ===== */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
    background: linear-gradient(135deg, #ffffff, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 3s ease infinite;
}

@keyframes gradient-shift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 3px;
    box-shadow: 0 0 20px var(--primary-color);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { width: 80px; opacity: 1; }
    50% { width: 120px; opacity: 0.8; }
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
}

/* ===== 公司介绍 ===== */
.about-content {
    max-width: 1000px;
    margin: 0 auto;
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-item {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-light);
    border-radius: 10px;
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-item h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.feature-item p {
    color: var(--text-light);
}

/* ===== 企业发展时间线 ===== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--primary-color);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    width: 50%;
}

.timeline-item:nth-child(odd) {
    padding-right: 3rem;
    text-align: right;
}

.timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-left: 3rem;
}

.timeline-dot {
    position: absolute;
    top: 0;
    width: 20px;
    height: 20px;
    background-color: var(--primary-color);
    border: 4px solid white;
    border-radius: 50%;
    box-shadow: var(--shadow);
}

.timeline-item:nth-child(odd) .timeline-dot {
    right: -10px;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -10px;
}

.timeline-content {
    background-color: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.timeline-content h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    color: var(--text-color);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.timeline-content p {
    color: var(--text-light);
}

/* ===== 产品介绍 ===== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.product-card {
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.9) 0%, rgba(22, 33, 62, 0.9) 100%);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
    border: 1px solid rgba(99, 102, 241, 0.1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.product-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.5s;
}

.product-card:hover::before {
    opacity: 1;
}

.product-card:hover {
    transform: translateY(-15px) rotateX(5deg);
    box-shadow: var(--shadow-lg), var(--glow);
    border-color: rgba(99, 102, 241, 0.5);
}

.product-icon {
    font-size: 4.5rem;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 4px 8px rgba(99, 102, 241, 0.4));
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.product-card:hover .product-icon {
    animation: bounce 0.6s ease;
}

@keyframes bounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2) rotate(5deg); }
}

.product-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.product-card > p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.product-features {
    list-style: none;
    margin-bottom: 1.5rem;
    text-align: left;
}

.product-features li {
    padding: 0.5rem 0;
    color: var(--text-color);
}

/* ===== 服务项目 ===== */
.services-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.service-item {
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.9) 0%, rgba(22, 33, 62, 0.9) 100%);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(99, 102, 241, 0.1);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.service-item::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left 0.5s;
}

.service-item:hover::after {
    left: 100%;
}

.service-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-lg), var(--glow);
    border-color: rgba(99, 102, 241, 0.5);
}

.service-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.service-icon {
    font-size: 3.5rem;
    margin-right: 1rem;
    filter: drop-shadow(0 4px 8px rgba(139, 92, 246, 0.4));
    transition: var(--transition);
}

.service-item:hover .service-icon {
    transform: scale(1.2) rotate(360deg);
}

.service-item h3 {
    font-size: 1.5rem;
    color: var(--text-color);
}

.service-item > p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

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

.service-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-color);
}

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

/* ===== 客户案例 ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.case-card {
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.9) 0%, rgba(22, 33, 62, 0.9) 100%);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(99, 102, 241, 0.1);
    backdrop-filter: blur(10px);
}

.case-card:hover {
    transform: translateY(-12px) rotateY(3deg);
    box-shadow: var(--shadow-lg), var(--glow);
    border-color: rgba(99, 102, 241, 0.6);
}

.case-image {
    height: 220px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.case-image::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(255, 255, 255, 0.05) 10px,
        rgba(255, 255, 255, 0.05) 20px
    );
    animation: slide 20s linear infinite;
}

@keyframes slide {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50%, 50%); }
}

.case-card:hover .case-image::before {
    animation-duration: 10s;
}

.case-placeholder {
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
}

.case-content {
    padding: 2rem;
}

.case-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.case-content > p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.case-stats {
    display: flex;
    gap: 2rem;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

/* ===== 联系我们 ===== */
.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.contact-info h3,
.contact-form h3 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.info-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 2rem;
}

.info-icon {
    font-size: 2rem;
    margin-right: 1rem;
}

.info-text h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.info-text p {
    color: var(--text-light);
}

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

.social-links h4 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.social-icons {
    display: flex;
    gap: 1rem;
}

.social-icon {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: var(--transition);
}

.social-icon:hover {
    background-color: var(--secondary-color);
}

/* ===== 表单样式 ===== */
.contact-form {
    background-color: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ===== 页脚 ===== */
.footer {
    background: linear-gradient(180deg, rgba(10, 10, 15, 0.95) 0%, rgba(0, 0, 0, 0.98) 100%);
    color: white;
    padding: 4rem 0 1.5rem;
    border-top: 2px solid rgba(99, 102, 241, 0.3);
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), var(--accent-color), transparent);
    animation: flow 3s linear infinite;
}

@keyframes flow {
    0% { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.footer-section p,
.footer-section ul {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

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

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

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
}

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

/* ===== 返回顶部按钮 ===== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 55px;
    height: 55px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.8rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.back-to-top::before {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s;
}

.back-to-top:hover::before {
    opacity: 0.5;
    animation: rotate 2s linear infinite;
}

@keyframes rotate {
    100% { transform: rotate(360deg); }
}

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

.back-to-top:hover {
    transform: translateY(-8px) scale(1.1);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.6), var(--glow);
}

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

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: var(--shadow);
        padding: 2rem 0;
    }

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

    .hamburger {
        display: flex;
    }

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

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section {
        padding: 50px 0;
    }

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

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 4rem;
        padding-right: 0;
        text-align: left;
    }

    .timeline-item:nth-child(even) {
        margin-left: 0;
        padding-left: 4rem;
    }

    .timeline-item:nth-child(odd) {
        padding-right: 0;
        text-align: left;
    }

    .timeline-dot {
        left: 11px !important;
    }

    .products-grid,
    .services-content,
    .cases-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }

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

    .slider-btn {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 1.5rem;
    }
}