/* 现代响应式样式 - 图文通异科技 */

/* CSS变量定义 */
:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-dark: #0f172a;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --border-radius: 0.5rem;
    --border-radius-lg: 1rem;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

/* 通用样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        font-size: 1.5rem;
        font-weight: 700;
        color: var(--primary-color);
    }

    @media (max-width: 480px) {
        .nav-logo {
            font-size: 1.1rem;
            gap: 0.5rem;
        }
    }

    @media (max-width: 390px) {
        .nav-logo {
            font-size: 1rem;
            gap: 0.4rem;
        }
    }

.logo-img {
        width: 50px;
        height: 50px;
        border-radius: 8px;
        object-fit: cover;
    }

    .logo-text {
        font-size: inherit;
    }

    @media (max-width: 480px) {
        .logo-img {
            width: 35px;
            height: 35px;
        }
        .logo-text {
            font-size: 1rem;
        }
    }

    @media (max-width: 390px) {
        .logo-img {
            width: 30px;
            height: 30px;
        }
        .logo-text {
            font-size: 0.9rem;
        }
    }

    @media (max-width: 350px) {
        .logo-text {
            font-size: 0.8rem;
        }
    }

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

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

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

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

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

/* 语言切换按钮 */
.language-switch {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 2rem;
}

.lang-btn {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.3s ease;
    min-width: 36px;
}

.lang-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.hamburger:hover {
    background: rgba(37, 99, 235, 0.1);
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 2px;
}

/* 首页横幅 */
.hero {
    min-height: 50vh;
    max-height: fit-content;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #A1ABC4 0%, #e2e8f0 50%, #cbd5e1 100%);
    color: #1f2937;
    padding: 100px 0 60px;
    position: relative;
    overflow: hidden;
}

.logo-container {
    margin-bottom: 0.5rem;
    text-align: left;
}

.header-logo {
    width: clamp(180px, 25vw, 220px);
    height: clamp(80px, 15vw, 120px);
    object-fit: contain;
    border-radius: 8px;
    max-width: 100%;
    height: auto;
}


.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="a" cx="50%" cy="50%"><stop offset="0%" stop-color="%23ffffff" stop-opacity="0.1"/><stop offset="100%" stop-color="%23ffffff" stop-opacity="0"/></radialGradient></defs><circle cx="200" cy="200" r="100" fill="url(%23a)"/><circle cx="800" cy="300" r="150" fill="url(%23a)"/><circle cx="400" cy="700" r="120" fill="url(%23a)"/></svg>');
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.hero-container {
    max-width: 1200px;
    min-height: fit-content;
    margin: 0 auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 60% 40%;
    gap: 0.5rem;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 2.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.title-prefix {
    background: linear-gradient(45deg, #374151, #6b7280);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    /*animation: fadeInUp 1s ease-out;*/
}

.title-main {
    background: linear-gradient(135deg, #2563eb, #3b82f6, #7c3aed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    /*animation: glowPulse 2s ease-in-out infinite alternate;*/
}

/* 光标闪烁动画 */
.title-cursor {
    display: inline-block;
    color: #00d4ff;
    font-weight: 300;
    animation: blink 1s infinite;
    margin-left: 0.2rem;
}

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

@keyframes glowPulse {
    from {
        text-shadow: 0 0 10px rgba(37, 99, 235, 0.3), 0 0 20px rgba(37, 99, 235, 0.2);
    }
    to {
        text-shadow: 0 0 20px rgba(37, 99, 235, 0.6), 0 0 30px rgba(37, 99, 235, 0.4), 0 0 40px rgba(124, 58, 237, 0.2);
    }
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.gradient-text {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.7;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    position: relative;
    display: inline-block;
}

.subtitle-text {
    background: linear-gradient(90deg, #4b5563, #6b7280);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 500;
    /*animation: slideInLeft 1s ease-out 0.5s both;*/
}

.subtitle-glow {
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, #3b82f6, transparent);
    animation: glowExpand 2s ease-in-out infinite;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes glowExpand {
    0%, 100% {
        opacity: 0.5;
        transform: scaleX(0.5);
    }
    50% {
        opacity: 1;
        transform: scaleX(1);
    }
}

.tech-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #4b5563;
    /*animation: fadeIn 1s ease-out 1s both;*/
}

.desc-line {
    display: block;
    margin-bottom: 0.8rem;
}

.highlight-word {
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
    position: relative;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 0.85; }
}



.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 1000px;
}

.product-image {
    width: 100%;
    max-width: 100%;
    height: auto;
    object-fit: contain;
    transform: rotateY(-5deg) rotateX(5deg);
    transition: var(--transition);
    background-color: transparent;
    mix-blend-mode: multiply;
    -webkit-mask-image: radial-gradient(ellipse 50% 50% at center, rgba(0, 0, 0, 1) 0%, rgba(0, 0, 0, 0.8) 60%, rgba(0, 0, 0, 0) 100%);
    mask-image: radial-gradient(ellipse 70% 70% at center, rgba(0, 0, 0, 1) 0%, rgba(0, 0, 0, 0.8) 60%, rgba(0, 0, 0, 0) 100%);
}

/* 产品图片悬停效果 */
/*
.product-image:hover {
    transform: rotateY(0) rotateX(0);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
}*/

.product-demo {
    max-width: 100%;
    height: auto;
    transition: var(--transition);
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;
}

/*
.product-demo:hover {
    transform: translateY(-10px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
}*/

.btn-primary, .btn-secondary {
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 100;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    position: relative;
    z-index: 10;
    cursor: pointer;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

/* 差异动画 */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.diff-animation {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    max-width: 500px;
}

.doc-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.doc-panel {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    padding: 1rem;
}

.doc-header {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: rgba(255, 255, 255, 0.8);
}

.text-line {
    font-size: 0.875rem;
    margin: 0.25rem 0;
    padding: 0.25rem;
    border-radius: 4px;
}

.text-line.added {
    background: rgba(16, 185, 129, 0.2);
    border-left: 3px solid var(--success-color);
}

.text-line.removed {
    background: rgba(239, 68, 68, 0.2);
    border-left: 3px solid var(--error-color);
    text-decoration: line-through;
    opacity: 0.7;
}

.diff-indicators {
    display: flex;
    gap: 1rem;
    justify-content: center;
    font-size: 0.75rem;
}

.indicator {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* 关于我们 */
.about {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.about-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.tech-stack {
    display: grid;
    gap: 1rem;
}

.tech-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.tech-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-lg);
}

.tech-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

/* 产品介绍 */
.product {
    padding: 100px 0;
    background: white;
}

.product-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.product-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.product-title {
    font-size: 2.0rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.product-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.product-features {
    list-style: none;
    margin-bottom: 2rem;
}

.product-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.product-features i {
    color: var(--success-color);
}

.product-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: flex-start;
}

.product-demo {
    display: flex;
    justify-content: center;
    align-items: center;
}

.demo-container {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    max-width: 500px;
    width: 100%;
}

.demo-header {
    background: var(--bg-secondary);
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.demo-tabs {
    display: flex;
    gap: 1rem;
}

.tab {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.tab.active {
    color: var(--primary-color);
    font-weight: 600;
    border-bottom: 2px solid var(--primary-color);
}

.demo-content {
    padding: 2rem;
}

.file-drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.file-drop-zone:hover {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
}

.file-drop-zone i {
    font-size: 3rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.file-drop-zone p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.file-drop-zone small {
    color: var(--text-light);
}

/* 服务形式 */
.services {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.service-card {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    text-align: center;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.service-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

.service-features {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.service-features span {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.875rem;
}

.service-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.service-cta:hover {
    gap: 1rem;
    color: var(--secondary-color);
}

/* 主要客户 */
.clients {
    padding: 100px 0;
    background: white;
}

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

.client-category {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
}

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

.category-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-size: 1.5rem;
}

.client-category h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.client-list {
    list-style: none;
    color: var(--text-secondary);
}

.client-list li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.client-list li:last-child {
    border-bottom: none;
}

.client-list li i {
    color: var(--primary-color);
    font-size: 0.8rem;
    width: 16px;
    text-align: center;
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-info {
    display: grid;
    gap: 2rem;
}

.info-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.info-item i {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.info-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

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

.contact-form {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
}

.contact-form h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.0rem;
    color: var(--text-primary);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    height: 30px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: var(--font-family);
}

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

.submit-btn {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-bottom: 2rem;
}

.footer-info {
    display: grid;
    gap: 1rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.footer-logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
}

.footer-info p {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: white;
}

.footer-section a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin-bottom: 0.5rem;
    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);
    color: rgba(255, 255, 255, 0.7);
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: white;
    margin: 2% auto;
    border-radius: var(--border-radius-lg);
    width: 90%;
    max-width: 600px;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease-out;
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 2rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
}

.close {
    color: var(--text-light);
    font-size: 2rem;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}

.close:hover {
    color: var(--primary-color);
}

.modal-body {
    padding: 2rem;
}

.modal-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: center;
    font-size: 1.1rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

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

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

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

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

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-group select {
    cursor: pointer;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
    .modal-content {
        margin: 10% auto;
        width: 95%;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .product-image {
        max-width: 90%;
        height: auto;
    }

    .hamburger {
        display: flex;
    }

    .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-lg);
        padding: 2rem 0;
    }

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

    .hero {
        padding: 80px 0 40px;
        min-height: 50vh;
        max-height: fit-content;
    }

    .hero-container {
        min-height: fit-content;
        grid-template-columns: 1fr;
        grid-template-rows: 60% 40%;
        text-align: center;
        gap: 0.5rem;
    }

    .hero-title {
        font-size: 2.0rem;
        justify-content: center;
    }

    .product-title {
        font-size: 2rem;
        line-height: 1.25;
        letter-spacing: -0.015em;
    }

    .logo-container {
        text-align: center;
    }

    .header-logo {
        width: clamp(120px, 35vw, 180px);
        height: clamp(60px, 25vw, 60px);
    }

    .about-content,
    .product-showcase,
    .contact-content,
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

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

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

    .hero-buttons {
        justify-content: center;
    }

    .product-cta {
        justify-content: center;
    }
}

@media (max-width: 480px) {    
    .hero {
        padding: 80px 0 40px;
        min-height: 50vh;
        max-height: fit-content;
    }

    .hero-title {
        font-size: 2rem;
        margin-bottom: 1.5rem;
    }

    .product-title {
        font-size: 1.75rem;
        line-height: 1.2;
        letter-spacing: -0.01em;
        margin-bottom: 1rem;
    }

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

    .btn-primary,
    .btn-secondary {
        padding: 0.75rem 1.5rem;
        font-size: 0.875rem;
    }

    .hero-container {
        min-height: fit-content;
        grid-template-columns: 1fr;
        gap: 0.5rem;
        padding: 0 0.5rem;
        grid-template-rows: 60% 40%;
        text-align: center;
    }

    .product-image {
        max-width: 90%;
        height: auto;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .service-card,
    .client-category {
        padding: 1.5rem;
    }

    .modal-content {
        margin: 10% auto;
        padding: 1.5rem;
    }
}

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

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

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}