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

:root {
    --primary-blue: #1e3a8a;
    --secondary-blue: #3b82f6;
    --accent-red: #dc2626;
    --bg-light: #f0f4ff;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --white: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
}

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

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

ul {
    list-style: none;
}

/* 导航栏 */
.navbar {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 15px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 20px;
}

.logo img {
    height: 40px;
    width: auto;
}

.logo-dhc {
    height: 50px;
}

.logo-yt {
    height: 120px;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-menu a {
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary-blue);
}

/* 导航栏登录按钮 */
.nav-login-btn {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white) !important;
    padding: 8px 16px !important;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 2px 10px rgba(30, 58, 138, 0.3);
}

.nav-login-btn:hover {
    background: linear-gradient(135deg, var(--secondary-blue) 0%, var(--primary-blue) 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(30, 58, 138, 0.5);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

/* Banner 区 */
.banner {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white);
    padding: 150px 0 100px;
    text-align: center;
    margin-top: 70px;
}

.banner-title {
    font-size: 2.5rem;
    margin-bottom: 15px;
    font-weight: 700;
}

.banner-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 20px;
}

.banner-company {
    font-size: 1rem;
    opacity: 0.8;
    margin-bottom: 40px;
}

.banner-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
}

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

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

.btn-outline {
    background: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

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

/* 通用区块样式 */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    color: var(--primary-blue);
    margin-bottom: 15px;
}

.section-desc {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 50px;
    font-size: 1.1rem;
}

/* 关于我们 */
.about {
    background: var(--white);
}

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

.about-intro {
    font-size: 1.1rem;
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-features {
    margin-top: 30px;
}

.about-features li {
    padding: 8px 0;
    color: var(--text-dark);
}

.about-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

/* SaaS CTA 蓝色方块 */
.saas-cta-box {
    display: block;
    width: 100%;
    height: 300px;
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    border-radius: 10px;
    padding: 25px 20px;
    text-align: center;
    color: var(--white);
    text-decoration: none;
    box-shadow: 0 5px 20px rgba(30, 58, 138, 0.3);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.saas-cta-box::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.saas-cta-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(30, 58, 138, 0.5);
}

.saas-cta-box:hover .cta-ai {
    transform: scale(1.1);
    text-shadow: 0 0 30px rgba(255,255,255,0.8), 0 0 60px rgba(59, 130, 246, 0.8);
}

.cta-line-1 {
    font-size: 0.95rem;
    margin-bottom: 10px;
    opacity: 0.95;
    line-height: 1.4;
}

.cta-ai {
    font-size: 3.5rem;
    font-weight: 900;
    margin: 15px 0;
    background: linear-gradient(135deg, #ffffff 0%, #60a5fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 40px rgba(59, 130, 246, 0.5);
    animation: aiGlow 2s ease-in-out infinite alternate;
    letter-spacing: 5px;
    position: relative;
    z-index: 1;
}

@keyframes aiGlow {
    0% { 
        filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.5));
        transform: scale(1);
    }
    100% { 
        filter: drop-shadow(0 0 25px rgba(59, 130, 246, 0.9));
        transform: scale(1.05);
    }
}

.cta-line-2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 5px;
    line-height: 1.4;
}

.cta-line-3 {
    font-size: 1rem;
    opacity: 0.95;
    margin-bottom: 20px;
}

.cta-button {
    display: inline-block;
    padding: 10px 25px;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.6);
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s;
    position: relative;
    z-index: 1;
}

.saas-cta-box:hover .cta-button {
    background: var(--white);
    color: var(--primary-blue);
    border-color: var(--white);
}

/* 产品体系 */
.products {
    background: var(--bg-light);
}

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

.product-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s;
    position: relative;
}

.product-card:hover {
    transform: translateY(-10px);
}

.product-card.featured {
    border: 3px solid var(--primary-blue);
}

.featured-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-red);
    color: var(--white);
    padding: 5px 20px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.product-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.product-card h3 {
    color: var(--primary-blue);
    margin-bottom: 10px;
}

.product-name {
    color: var(--text-light);
    font-family: monospace;
    margin-bottom: 20px;
}

.product-features {
    text-align: left;
    margin-bottom: 30px;
}

.product-features li {
    padding: 8px 0;
    color: var(--text-dark);
}

.qr-code {
    margin-top: 20px;
}

.qr-code img {
    width: 150px;
    height: 150px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.qr-code p {
    margin-top: 10px;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* 核心功能 */
.features {
    background: var(--white);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 2fr);
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 30px;
    border-radius: 10px;
    transition: all 0.3s;
}

.feature-item:hover {
    background: var(--bg-light);
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.feature-item h3 {
    color: var(--primary-blue);
    margin-bottom: 10px;
}

.feature-item p {
    color: var(--text-light);
    line-height: 1.8;
}

/* 系统展示 */
.showcase {
    background: var(--bg-light);
}

.showcase-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: stretch;
}

.showcase-left {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.showcase-mobile-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.showcase-mobile-row img {
    width: 100%;
    height: 350px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.showcase-mobile-row img:hover {
    transform: translateY(-5px);
}

.showcase-main-map {
    flex: 1;
}

.showcase-main-map img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    min-height: 400px;
}

.showcase-right {
    display: flex;
    flex-direction: column;
    gap: 20px;
    height: 100%;
}

.showcase-right-top,
.showcase-right-bottom {
    flex: 1;
    min-height: 0;
}

.showcase-right-top img,
.showcase-right-bottom img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.showcase-left {
    display: flex;
    flex-direction: column;
    gap: 20px;
    height: 100%;
}

.showcase-main-map {
    flex: 1;
    min-height: 0;
}

.showcase-main-map img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

/* 联系我们 */
.contact {
    background: var(--primary-blue);
    color: var(--white);
}

.contact .section-title {
    color: var(--white);
}

.contact .section-desc {
    color: rgba(255,255,255,0.8);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.contact-card {
    background: rgba(255,255,255,0.1);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    backdrop-filter: blur(10px);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.contact-card h4 {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.contact-text {
    color: rgba(255,255,255,0.9);
    line-height: 1.8;
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.2);
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
}

.copyright a {
    color: rgba(255,255,255,0.9);
}

.copyright a:hover {
    text-decoration: underline;
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
    transition: all 0.3s;
    display: none;
}

.back-to-top:hover {
    background: var(--secondary-blue);
    transform: translateY(-5px);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cta-ai {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-login-btn {
        background: var(--primary-blue);
        text-align: center;
        margin-top: 10px;
    }
    
    .logo img {
        height: 30px;
    }
    
    .logo-dhc {
        height: 40px;
    }
    
    .logo-yt {
        height: 90px;
    }
    
    .banner-title {
        font-size: 1.8rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .showcase-grid {
        grid-template-columns: 1fr;
    }
    
    .showcase-mobile-row {
        grid-template-columns: 1fr;
    }
    
    .showcase-mobile-row img {
        height: 300px;
    }
    
    .banner-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .saas-cta-box {
        height: 280px;
        padding: 20px 15px;
    }
    
    .cta-line-1 {
        font-size: 0.85rem;
    }
    
    .cta-ai {
        font-size: 2.5rem;
        margin: 10px 0;
    }
    
    .cta-line-2 {
        font-size: 1rem;
    }
    
    .cta-line-3 {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .banner {
        padding: 100px 0 60px;
    }
    
    .banner-title {
        font-size: 1.5rem;
    }
    
    section {
        padding: 50px 0;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}