/* ==========================================================================
   全局样式
   ========================================================================== */

:root {
    /* 色彩系统 - 黑白灰色调 */
    --color-black: #1A1A1A;
    --color-gray-900: #2D2D2D;
    --color-gray-800: #3D3D3D;
    --color-gray-700: #525252;
    --color-gray-600: #737373;
    --color-gray-500: #A3A3A3;
    --color-gray-400: #D4D4D4;
    --color-gray-300: #E5E5E5;
    --color-gray-200: #F5F5F5;
    --color-gray-100: #FAFAFA;
    --color-white: #FFFFFF;
    
    /* 强调色 - 暖色调橙红 */
    --color-accent: #D97706;
    --color-accent-dark: #B45309;
    --color-accent-light: #FBBF24;
    
    /* 成功色 - 绿色 */
    --color-success: #10B981;
    
    /* 标签色 - 蓝色 */
    --color-tag: #3B82F6;
    
    /* 字体 */
    --font-sans: 'Montserrat', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* 动画 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

/* RTL支持 */
[dir="rtl"] {
    direction: rtl;
}

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

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-gray-900);
    background-color: var(--color-white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray-600);
}

/* ==========================================================================
   导航栏
   ========================================================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-black);
    text-decoration: none;
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.navbar-menu a {
    text-decoration: none;
    color: var(--color-gray-700);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.lang-switcher {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.lang-btn {
    background: none;
    border: none;
    color: var(--color-gray-600);
    cursor: pointer;
    padding: var(--spacing-xs);
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

.lang-btn.active {
    color: var(--color-accent);
    font-weight: 600;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-white);
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: background-color var(--transition-fast);
    display: inline-block;
    border: none;
    cursor: pointer;
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--color-white);
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--color-white);
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-fast);
    display: inline-block;
}

.btn-secondary:hover {
    background-color: var(--color-white);
    color: var(--color-black);
}

.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.navbar-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-gray-900);
    transition: all var(--transition-fast);
}

/* ==========================================================================
   Hero区域
   ========================================================================== */

.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0,0,0,0.5), rgba(0,0,0,0.7));
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    color: var(--color-white);
    max-width: 900px;
    padding: 0 var(--spacing-md);
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent-light);
}

.hero-desc {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

/* ==========================================================================
   Partners区域
   ========================================================================== */

.partners-section {
    padding: var(--spacing-2xl) 0;
    background-color: var(--color-gray-100);
}

.partners-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.partners-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
}

.partners-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray-600);
}

.partners-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-2xl);
    flex-wrap: wrap;
}

.partner-logo {
    width: 200px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-white);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md);
    transition: transform var(--transition-normal);
}

.partner-logo:hover {
    transform: translateY(-5px);
}

/* ==========================================================================
   服务卡片网格（新设计）
   ========================================================================== */

.services-section {
    background-color: var(--color-white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.service-card {
    background-color: var(--color-white);
    border: 2px solid var(--color-gray-300);
    border-radius: 1rem;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.service-card.active {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg);
}

.service-card-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-gray-200);
    border-radius: 1rem;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-normal);
}

.service-card.active .service-card-icon,
.service-card:hover .service-card-icon {
    background-color: var(--color-accent);
    color: var(--color-white);
}

.service-card-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
}

.service-card-desc {
    font-size: 1rem;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
    flex-grow: 1;
}

.service-card-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 0.5rem;
    margin-bottom: var(--spacing-md);
}

.service-card-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    background-color: var(--color-accent);
    color: var(--color-white);
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.service-card-btn:hover {
    background-color: var(--color-accent-dark);
}

.service-card-btn svg {
    transition: transform var(--transition-normal);
}

.service-card.active .service-card-btn svg {
    transform: rotate(180deg);
}

/* ==========================================================================
   服务详情展开区域（图文并茂）
   ========================================================================== */

.service-detail-container {
    max-width: 100%;
    margin-top: var(--spacing-xl);
}

.service-detail {
    display: none;
    background-color: var(--color-gray-100);
    border-radius: 1rem;
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    animation: fadeInSlideDown var(--transition-slow);
}

.service-detail.active {
    display: flex;
    gap: var(--spacing-xl);
}

.service-detail-image {
    flex: 0 0 40%;
    max-width: 40%;
}

.service-detail-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
}

.service-detail-content {
    flex: 1;
    min-width: 0;
}

.service-detail-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: var(--spacing-md);
}

.service-detail-desc {
    font-size: 1.125rem;
    color: var(--color-gray-700);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.service-detail-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-lg);
    position: relative;
    padding-left: 1rem;
}

.service-detail-subtitle::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.25rem;
    width: 4px;
    height: 1.75rem;
    background-color: var(--color-accent);
    border-radius: 2px;
}

.service-advantages-list {
list-style: none;
    padding: 0;
    margin-bottom: var(--spacing-lg);
}

.service-advantages-list li {
    position: relative;
    padding-left: 2.5rem;
    margin-bottom: 1rem;
    font-size: 1.125rem;
    color: var(--color-gray-700);
    line-height: 1.6;
}

.service-advantages-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 0;
    width: 1.75rem;
    height: 1.75rem;
    background-color: var(--color-success);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1rem;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.service-tag {
    display: inline-block;
    background-color: var(--color-tag);
    color: var(--color-white);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
}

/* ==========================================================================
   服务流程
   ========================================================================== */

.process-section {
    background-color: var(--color-gray-100);
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.process-item {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--color-white);
    border-radius: 1rem;
    transition: transform var(--transition-normal);
}

.process-item:hover {
    transform: translateY(-5px);
}

.process-number {
    display: inline-block;
    width: 60px;
    height: 60px;
    line-height: 60px;
    background-color: var(--color-accent);
    color: var(--color-white);
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
    margin-bottom: var(--spacing-md);
}

.process-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
}

.process-desc {
    font-size: 1rem;
    color: var(--color-gray-600);
}

/* ==========================================================================
   Why Us区域
   ========================================================================== */

.why-section {
    background-color: var(--color-white);
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.why-item {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--color-gray-100);
    border-radius: 1rem;
    transition: all var(--transition-normal);
}

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

.why-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.why-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
}

.why-desc {
    font-size: 1rem;
    color: var(--color-gray-600);
}

/* ==========================================================================
   联系我们区域
   ========================================================================== */

.contact-section {
    background-color: var(--color-gray-100);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.contact-card {
    background-color: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: 1rem;
    text-align: center;
    transition: all var(--transition-normal);
}

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

.contact-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-accent);
    color: var(--color-white);
    border-radius: 50%;
}

.contact-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
}

.contact-card-text {
    font-size: 1rem;
    color: var(--color-gray-700);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    background-color: var(--color-gray-900);
    color: var(--color-gray-400);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

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

.footer-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.footer-text {
    font-size: 0.875rem;
    line-height: 1.8;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-gray-400);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-contact {
    list-style: none;
    font-size: 0.875rem;
}

.footer-contact li {
    margin-bottom: var(--spacing-sm);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-gray-800);
    color: var(--color-gray-400);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-gray-800);
}

.footer-copyright {
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

/* ==========================================================================
   响应式设计
   ========================================================================== */

@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .navbar-menu,
    .navbar-actions {
        display: none;
    }
    
    .navbar-toggle {
        display: flex;
    }
    
    .hero {
        min-height: 500px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-desc {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .service-detail.active {
        flex-direction: column;
    }
    
    .service-detail-image {
        flex: 0 0 auto;
        max-width: 100%;
        margin-bottom: var(--spacing-lg);
    }
    
    .service-detail-image img {
        height: 250px;
    }
    
    .service-detail-title {
        font-size: 1.5rem;
    }
    
    .service-detail-desc {
        font-size: 1rem;
    }
    
    .service-detail-subtitle {
        font-size: 1.25rem;
    }
    
    .service-advantages-list li {
        font-size: 1rem;
    }
    
    .process-grid {
        grid-template-columns: 1fr;
    }
    
    .why-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .partners-logos {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

/* ==========================================================================
   RTL布局支持
   ========================================================================== */

[dir="rtl"] .service-detail-subtitle {
    padding-left: 0;
    padding-right: 1rem;
}

[dir="rtl"] .service-detail-subtitle::before {
    left: auto;
    right: 0;
}

[dir="rtl"] .service-advantages-list li {
    padding-left: 0;
    padding-right: 2.5rem;
}

[dir="rtl"] .service-advantages-list li::before {
    left: auto;
    right: 0;
}

/* ==========================================================================
   动画效果
   ========================================================================== */

@keyframes fadeInSlideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==========================================================================
   打印样式
   ========================================================================== */

@media print {
    .navbar,
    .hero-buttons,
    .footer {
        display: none;
    }
    
    .service-detail {
        display: flex !important;
    }
}