:root {
    --primary: #4D5F79;
    --primary-dark: #3a485e;
    --primary-light: #647892;
    --accent: #F20000;
    --accent-light: #ff4d4d;
    --secondary: #5c6b84;
    --light: #f8fafc;
    --dark: #1e293b;
    --success: #10b981;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition: all 0.3s ease;
    --glass-bg: #000000bb;
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--dark);
    line-height: 1.6;
    background-color: #f9fafb;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 新增：语言切换按钮样式 */
.language-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    display: flex;
    gap: 8px;
}

.lang-btn {
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background: rgba(0, 0, 0, 0.5);
    color: white;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

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

.lang-btn:hover {
    background: var(--accent-light);
    border-color: var(--accent-light);
}

/* Header Styles */
header {
    background-color: var(--glass-bg);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
    padding-right: 120px; /* 为语言切换按钮留出空间 */
}

header.scrolled {
    background-color: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 24px;
    color: white;
}

.logo i {
    margin-right: 10px;
    color: var(--accent);
}

nav ul {
    display: flex;
    gap: 30px;
}

nav a {
    font-weight: 500;
    transition: color 0.15s ease, font-weight 0.15s ease;
    position: relative;
    color: white;
}

nav a:hover {
    color: var(--accent-light);
}

nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-light);
    transition: width 0.2s ease;
}

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

nav a.active {
    color: var(--accent-light);
    font-weight: 600;
}

.header-buttons {
    display: flex;
    gap: 15px;
}

.btn {
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-outline {
    background: transparent;
    border: 1px solid white;
    color: white;
}

.btn-outline:hover {
    background: white;
    color: var(--primary);
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-light);
}

/* Hero Section */
.hero {
    padding: 0;
    height: 100vh;
    position: relative;
    overflow: hidden;
    color: white;
}

.hero-slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease;
    background-size: cover;
    background-position: center;
}

.slide::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.4) 50%, rgba(0, 0, 0, 0.3) 100%);
}

.slide.active {
    opacity: 1;
    /*animation: breathe 8s infinite ease-in-out;*/
}

.slide:hover {
    animation: none;
    /*transform: scale(1.01);*/
}

.slide-1 {
    background-image: url('https://images.unsplash.com/photo-1460925895917-afdab827c52f?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1115&q=80');
}

.slide-2 {
    background-image: url('https://images.unsplash.com/photo-1552664730-d307ca884978?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1170&q=80');
}

.slide-3 {
    background-image: url('https://images.unsplash.com/photo-1563986768609-322da13575f3?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1170&q=80');
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 660px;
    padding: 0 20px;
    margin-top: 200px;
    margin-left: 50px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: white;
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 30px;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.slider-controls {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 5;
}

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

.slider-dot.active {
    background: white;
    transform: scale(1.2);
}

/* Features Section */
.features {
    padding: 100px 0;
    background: white;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
}

.section-title p {
    font-size: 1.125rem;
    color: var(--secondary);
    max-width: 700px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.feature-image {
    width: 100%;
    height: 180px;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 20px;
    background: var(--light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 28px;
    position: relative;
}

.feature-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: var(--transition);
}

.feature-card:hover .feature-image img {
    transform: scale(1.05);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--dark);
}

.feature-card p {
    color: var(--secondary);
}

/* Use Cases Section */
.use-cases {
    padding: 100px 0;
    background: var(--light);
}

.tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
    gap: 10px;
}

.tab-btn {
    padding: 12px 24px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

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

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s forwards;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.case-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.case-image {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    position: relative;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.case-content {
    padding: 25px;
}

.case-content h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--dark);
}

.case-content p {
    color: var(--secondary);
}

/* Pricing Section */
.pricing {
    padding: 100px 0;
    background: white;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.pricing-card {
    background: white;
    border-radius: 12px;
    padding: 40px 30px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border);
}

.pricing-card.featured {
    transform: scale(1.05);
}

.pricing-card.featured::before {
    content: 'Most Popular';
    position: absolute;
    top: 0;
    right: 0;
    background: var(--primary);
    color: white;
    padding: 5px 15px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.pricing-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--dark);
}

.price {
    font-size: 3rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
}

.price span {
    font-size: 1rem;
    color: var(--secondary);
    font-weight: 400;
}

.pricing-features {
    margin: 30px 0;
    text-align: left;
}

.pricing-features li {
    margin-bottom: 10px;
    color: var(--secondary);
    display: flex;
    align-items: center;
}

.pricing-features li i {
    color: var(--success);
    margin-right: 10px;
}

/* CTA Section */
.cta {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: white;
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.cta p {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.9;
}

.cta .btn {
    background: white;
    color: var(--primary);
    font-weight: 600;
    padding: 15px 30px;
    font-size: 1.125rem;
}

.cta .btn:hover {
    background: var(--light);
    transform: translateY(-3px);
}

/* Footer */
footer {
    background: var(--dark);
    color: white;
    padding: 70px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 50px;
}

.footer-col h4 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    color: white;
}

.footer-col ul li {
    margin-bottom: 10px;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-col ul li:hover {
    opacity: 1;
    color: var(--accent-light);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

@keyframes breathe {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.03); }
}

/* Responsive Styles */
@media (max-width: 992px) {
    .features-grid,
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid,
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .header-container {
        flex-direction: column;
        gap: 20px;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
    
    .hero-content {
        margin-left: 0;
        text-align: center;
        margin-top: 250px;
    }
    
    .hero p {
        margin: 0 auto 30px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    /* 响应式调整语言切换按钮 */
    .language-switcher {
        top: 10px;
        right: 10px;
    }
    
    .lang-btn {
        padding: 6px 12px;
        font-size: 12px;
    }
    
    header {
        padding-right: 0px;
    }
}

/* Subpage Styles */
.subpage-hero {
    padding: 160px 0 80px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    text-align: center;
}

.subpage-content {
    padding: 80px 0;
    background: white;
}

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

.content-text h2 {
    font-size: 2.2rem;
    margin-bottom: 20px;
    color: var(--dark);
}

.content-text p {
    font-size: 1.1rem;
    color: var(--secondary);
    margin-bottom: 25px;
    line-height: 1.8;
}

.content-image {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.content-image img {
    width: 100%;
    height: auto;
    display: block;
}

.feature-list {
    margin-top: 40px;
}

.feature-list li {
    margin-bottom: 15px;
    display: flex;
    align-items: flex-start;
}

.feature-list li i {
    color: var(--primary);
    margin-right: 15px;
    font-size: 1.2rem;
    margin-top: 3px;
}

/* Breadcrumb */
.breadcrumb {
    padding: 20px 0;
    background: var(--light);
    margin-bottom: 0;
}

.breadcrumb ul {
    display: flex;
    gap: 10px;
    font-size: 0.9rem;
}

.breadcrumb li:not(:last-child)::after {
    content: '/';
    margin-left: 10px;
    color: var(--secondary);
}

.breadcrumb a {
    color: var(--primary);
    transition: var(--transition);
}

.breadcrumb a:hover {
    color: var(--accent);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: white;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    position: relative;
    animation: slideInUp 0.3s ease;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.modal-header {
    height: 66px;
    padding: 0 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.modal-header h2 {
    color: var(--dark);
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.close {
    font-size: 28px;
    font-weight: bold;
    color: var(--secondary);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
    padding: 5px;
}

.close:hover {
    color: var(--accent);
    transform: scale(1.1);
}

.modal-body {
    padding: 20px 25px;
    overflow-y: auto;
    flex: 1;
    min-height: 0;
}

.modal-description {
    color: var(--secondary);
    margin-bottom: 10px;
    text-align: center;
}

.contact-form {
    width: 100%;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
    font-size: 0.95rem;
}

.required {
    color: var(--accent);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
    background: white;
    box-sizing: border-box;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(77, 95, 121, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.error-message {
    color: var(--accent);
    font-size: 0.85rem;
    margin-top: 5px;
    display: none;
}

.error-message.show {
    display: block;
}

.form-group.error input,
.form-group.error textarea {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(242, 0, 0, 0.1);
}

.modal-footer {
    border-top: 1px solid var(--border);
    padding: 20px 25px;
    flex-shrink: 0;
    background: white;
}

.form-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
}

.btn-secondary {
    background: transparent;
    color: var(--secondary);
    border: 1px solid var(--border);
}

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

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

/* Modal Responsive */
@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        margin: 20px;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding-left: 20px;
        padding-right: 20px;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-actions button {
        width: 100%;
    }
}