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

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

a {
    text-decoration: none;
    color: #4a90e2;
    transition: color 0.3s ease;
}

a:hover {
    color: #2a6fc9;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2.2rem;
    color: #2c3e50;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.primary-btn {
    background-color: #4a90e2;
    color: white;
    border: none;
}

.primary-btn:hover {
    background-color: #2a6fc9;
    color: white;
}

.secondary-btn {
    background-color: transparent;
    color: #4a90e2;
    border: 2px solid #4a90e2;
}

.secondary-btn:hover {
    background-color: #4a90e2;
    color: white;
}

/* 头部样式 */
header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
}

.logo h1 {
    font-size: 1.8rem;
    color: #4a90e2;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    color: #333;
    font-weight: 500;
    padding: 5px 0;
    position: relative;
}

nav ul li a:after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    background-color: #4a90e2;
    bottom: 0;
    left: 0;
    transition: width 0.3s ease;
}

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

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 英雄区域样式 */
.hero {
    padding: 80px 0;
    background-color: #f0f7ff;
}

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

.hero-content {
    flex: 1;
    padding-right: 40px;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #2c3e50;
}

.hero-content p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #7f8c8d;
}

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

.hero-image {
    flex: 1;
    text-align: center;
}

/* 特色区域样式 */
.features {
    padding: 80px 0;
    background-color: white;
}

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

.feature-card {
    background-color: #f9f9f9;
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 2.5rem;
    color: #4a90e2;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #2c3e50;
}

.feature-card p {
    color: #7f8c8d;
}

/* 如何使用区域样式 */
.how-it-works {
    padding: 80px 0;
    background-color: #f0f7ff;
}

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

.step {
    text-align: center;
    padding: 20px;
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background-color: #4a90e2;
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    border-radius: 50%;
    margin: 0 auto 20px;
}

.step h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #2c3e50;
}

.step p {
    color: #7f8c8d;
}

/* 用户评价区域样式 */
.testimonials {
    padding: 80px 0;
    background-color: white;
}

.testimonial-slider {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: 30px;
    padding: 20px 0;
    scrollbar-width: none; /* Firefox */
}

.testimonial-slider::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Edge */
}

.testimonial {
    flex: 0 0 calc(33.333% - 20px);
    min-width: 300px;
    scroll-snap-align: start;
    background-color: #f9f9f9;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.testimonial-content {
    margin-bottom: 20px;
}

.testimonial-content p {
    font-style: italic;
    color: #555;
}

.testimonial-author {
    display: flex;
    align-items: center;
}

.testimonial-author img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin-right: 15px;
}

.author-info h4 {
    font-size: 1.1rem;
    margin-bottom: 5px;
    color: #2c3e50;
}

.author-info p {
    font-size: 0.9rem;
    color: #7f8c8d;
}

/* CTA区域样式 */
.cta {
    padding: 80px 0;
    background-color: #4a90e2;
    color: white;
    text-align: center;
}

.cta-content h2 {
    font-size: 2.2rem;
    margin-bottom: 20px;
}

.cta-content p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.cta .primary-btn {
    background-color: white;
    color: #4a90e2;
}

.cta .primary-btn:hover {
    background-color: #f0f0f0;
}

/* 页脚样式 */
footer {
    background-color: #2c3e50;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo h2 {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.footer-logo p {
    opacity: 0.8;
}

.footer-links h3,
.footer-contact h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    position: relative;
}

.footer-links h3:after,
.footer-contact h3:after {
    content: '';
    position: absolute;
    width: 40px;
    height: 2px;
    background-color: #4a90e2;
    bottom: -10px;
    left: 0;
}

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links ul li a {
    color: #ecf0f1;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-links ul li a:hover {
    opacity: 1;
}

.footer-contact p {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.footer-contact p i {
    margin-right: 10px;
    color: #4a90e2;
}

.social-icons {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-icons a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: background-color 0.3s ease;
}

.social-icons a:hover {
    background-color: #4a90e2;
}

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

.footer-bottom p {
    opacity: 0.7;
    font-size: 0.9rem;
}

/* 聊天页面样式 */
.chat-container {
    max-width: 800px;
    margin: 40px auto;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.chat-header {
    background-color: #4a90e2;
    color: white;
    padding: 20px;
    text-align: center;
}

.chat-header h2 {
    font-size: 1.5rem;
}

.chat-messages {
    height: 400px;
    overflow-y: auto;
    padding: 20px;
}

.message {
    margin-bottom: 20px;
    display: flex;
}

.message.user {
    justify-content: flex-end;
}

.message-content {
    max-width: 70%;
    padding: 15px;
    border-radius: 10px;
}

.message.bot .message-content {
    background-color: #f0f7ff;
    border-bottom-left-radius: 0;
}

.message.user .message-content {
    background-color: #4a90e2;
    color: white;
    border-bottom-right-radius: 0;
}

.chat-input {
    display: flex;
    padding: 15px;
    border-top: 1px solid #eee;
}

.chat-input input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 30px;
    font-size: 1rem;
    outline: none;
}

.chat-input button {
    background-color: #4a90e2;
    color: white;
    border: none;
    border-radius: 30px;
    padding: 12px 20px;
    margin-left: 10px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.chat-input button:hover {
    background-color: #2a6fc9;
}

.chat-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
}

.option-button {
    background-color: #f0f7ff;
    border: 1px solid #4a90e2;
    color: #4a90e2;
    border-radius: 20px;
    padding: 8px 15px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.option-button:hover {
    background-color: #4a90e2;
    color: white;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }

    .hero-content {
        padding-right: 0;
        margin-bottom: 40px;
    }

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

@media (max-width: 768px) {
    nav {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .mobile-menu-open nav {
        display: block;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: white;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    }

    .mobile-menu-open nav ul {
        flex-direction: column;
        padding: 20px;
    }

    .mobile-menu-open nav ul li {
        margin: 10px 0;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .hero-content h2 {
        font-size: 2rem;
    }

    .testimonial {
        flex: 0 0 calc(100% - 20px);
    }
}

@media (max-width: 576px) {
    .cta-buttons {
        flex-direction: column;
        gap: 10px;
    }

    .btn {
        width: 100%;
    }

    .feature-card,
    .step,
    .testimonial {
        padding: 20px;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}