/* 基础重置和变量 */
:root {
    --primary-color: #2567E8;
    --secondary-color: #1e55d1;
    --accent-color: #4F8EF7;
    --light-blue: #E8F2FF;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --background: #ffffff;
    --surface: #f7fafc;
    --border: #e2e8f0;
    --shadow: rgba(37, 103, 232, 0.1);
    --gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    --hero-gradient: linear-gradient(135deg, #2567E8 0%, #1e55d1 100%);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

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

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px var(--shadow);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-logo .logo-image {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

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

.language-switcher {
    display: flex;
    gap: 0.5rem;
    margin-left: 1rem;
}

.language-switcher button {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    background: var(--background);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
}

.language-switcher button.active,
.language-switcher button:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.nav-hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* 首页横幅 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: var(--hero-gradient);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.1;
}

.animation-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.message-flow {
    display: flex;
    align-items: center;
    gap: 2rem;
    font-size: 3rem;
    opacity: 0;
    transform: translateY(20px);
    transition: all 1s ease;
}

.message-flow.animate {
    opacity: 1;
    transform: translateY(0);
}

.message-icon, .match-icon, .confirm-icon {
    animation: bounce 2s infinite;
}

.arrow {
    animation: pulse 2s infinite;
    color: var(--accent-color);
    font-weight: bold;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 2rem;
    color: white;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    margin-bottom: 2.5rem;
    opacity: 0.9;
    line-height: 1.6;
}

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

/* 按钮样式 */
.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(37, 103, 232, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(37, 103, 232, 0.6);
}

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

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

/* 通用区块样式 */
section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

/* 功能特色区块 */
.features {
    background: var(--surface);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px var(--shadow);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(37, 103, 232, 0.15);
    border-color: var(--accent-color);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

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

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 使用场景区块 */
.use-cases-grid {
    display: grid;
    gap: 3rem;
    max-width: 800px;
    margin: 0 auto;
}

.use-case {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 2rem;
    align-items: center;
    padding: 2rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px var(--shadow);
    transition: var(--transition);
}

.use-case:hover {
    transform: translateX(10px);
    box-shadow: 0 8px 30px rgba(37, 103, 232, 0.15);
    border-left: 4px solid var(--primary-color);
}

.use-case-image {
    display: flex;
    align-items: center;
    justify-content: center;
}

.use-case-icon {
    font-size: 4rem;
    padding: 1rem;
    background: var(--gradient);
    border-radius: 50%;
    color: white;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(37, 103, 232, 0.3);
}

.use-case-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.use-case-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 常见问题区块 */
.faq {
    background: var(--surface);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    overflow: hidden;
    box-shadow: 0 2px 10px var(--shadow);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--surface);
}

.faq-question h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.faq-question i {
    transition: var(--transition);
    color: var(--primary-color);
}

.faq-question i.rotated {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer.active {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 联系区块 */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    background: var(--surface);
    padding: 1rem;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

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

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: var(--gradient);
    color: white;
    border-radius: 50%;
    text-decoration: none;
    transition: var(--transition);
}

.social-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(37, 103, 232, 0.4);
}

.contact-form {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px var(--shadow);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 103, 232, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* 页脚 */
.footer {
    background: var(--text-primary);
    color: white;
    text-align: center;
    padding: 2rem 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer p {
    opacity: 0.8;
    margin: 0;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-link {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition);
    font-size: 0.9rem;
}

.footer-link:hover {
    opacity: 1;
    color: var(--accent-color);
}

/* 移动端响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 2rem;
        box-shadow: 0 4px 20px var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-hamburger {
        display: flex;
    }

    .language-switcher {
        margin-left: 0;
        margin-top: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 250px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .feature-card {
        padding: 2rem;
    }

    .use-case {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 1.5rem;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-form {
        padding: 1.5rem;
    }

    .message-flow {
        font-size: 2rem;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-content {
        padding: 1rem;
    }

    .feature-card {
        padding: 1.5rem;
    }

    .use-case {
        padding: 1.5rem;
    }

    .contact-form {
        padding: 1rem;
    }

    .message-flow {
        font-size: 1.5rem;
        gap: 0.5rem;
    }
}

/* 动画和过渡效果 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

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

/* 滚动行为 */
html {
    scroll-behavior: smooth;
}