/* 全局样式 */
:root {
    --color-bg-default: #ffffff;
    --color-bg-secondary: #f6f8fa;
    --color-border: #d0d7de;
    --color-text-primary: #24292f;
    --color-text-secondary: #57606a;
    --color-accent: #0969da;
    --color-accent-hover: #1b1f23;
    --color-success: #2da44e;
    --color-danger: #cf222e;
}

/* 英雄区域 */
.hero {
    padding: 80px 0;
    background: linear-gradient(to bottom, var(--color-bg-default), var(--color-bg-secondary));
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 48px;
}

.hero-content {
    flex: 1;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--color-text-primary);
}

.hero-description {
    font-size: 20px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

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

/* 特性展示 */
.features {
    padding: 80px 0;
    background-color: var(--color-bg-default);
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    color: var(--color-text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 32px;
    background-color: var(--color-bg-default);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
}

.feature-icon img {
    width: 100%;
    height: 100%;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-text-primary);
}

.feature-card p {
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text-secondary);
}

/* 使用场景 */
.use-cases {
    padding: 80px 0;
    background-color: var(--color-bg-secondary);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.use-case-card {
    padding: 32px;
    background-color: var(--color-bg-default);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: transform 0.3s ease;
}

.use-case-card:hover {
    transform: translateY(-4px);
}

.use-case-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-text-primary);
}

.use-case-card p {
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
}

.learn-more {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    display: inline-block;
}

.learn-more:hover {
    text-decoration: underline;
}

/* 技术特点 */
.tech-features {
    padding: 80px 0;
    background-color: var(--color-bg-default);
}

.tech-features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.tech-feature-card {
    padding: 32px;
    background-color: var(--color-bg-secondary);
    border-radius: 12px;
    transition: transform 0.3s ease;
}

.tech-feature-card:hover {
    transform: translateY(-4px);
}

.tech-feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-text-primary);
}

.tech-feature-card p {
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text-secondary);
}

/* 客户案例 */
.case-studies {
    padding: 80px 0;
    background-color: var(--color-bg-secondary);
}

.case-studies-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.case-study-card {
    padding: 32px;
    background-color: var(--color-bg-default);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: transform 0.3s ease;
}

.case-study-card:hover {
    transform: translateY(-4px);
}

.case-study-logo {
    margin-bottom: 24px;
}

.case-study-logo img {
    max-width: 120px;
    height: auto;
}

.case-study-quote {
    font-size: 18px;
    line-height: 1.6;
    color: var(--color-text-primary);
    margin-bottom: 24px;
    font-style: italic;
}

.case-study-author {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.case-study-author strong {
    font-size: 16px;
    color: var(--color-text-primary);
}

.case-study-author span {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* CTA 区域 */
.cta {
    padding: 80px 0;
    background: linear-gradient(to right, var(--color-accent), #1a4f91);
    color: white;
    text-align: center;
}

.cta h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta p {
    font-size: 20px;
    margin-bottom: 32px;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.cta .btn-outline {
    color: white;
    border-color: white;
}

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

/* 响应式设计 */
@media (max-width: 1200px) {
    .features-grid,
    .use-cases-grid,
    .tech-features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }

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

    .features-grid,
    .use-cases-grid,
    .tech-features-grid {
        grid-template-columns: 1fr;
    }

    .case-studies-grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero-description {
        font-size: 18px;
    }

    .section-title {
        font-size: 28px;
    }
} 

/* AI聊天工具展示 */
.chat-feature {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.chat-feature .section-title {
    color: white;
    margin-bottom: 48px;
}

.chat-demo {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.chat-demo-content h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
    color: white;
}

.chat-demo-content p {
    font-size: 18px;
    line-height: 1.6;
    margin-bottom: 32px;
    opacity: 0.9;
}

.chat-features-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 32px;
}

.chat-feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.1);
    padding: 12px 16px;
    border-radius: 8px;
    backdrop-filter: blur(10px);
}

.chat-feature-item .feature-icon {
    font-size: 20px;
}

.chat-demo-buttons {
    display: flex;
    gap: 16px;
}

.chat-demo-preview {
    display: flex;
    justify-content: center;
}

.chat-window {
    width: 400px;
    height: 500px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.chat-header {
    background: #f8f9fa;
    padding: 16px 20px;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    align-items: center;
    gap: 12px;
}

.chat-avatar {
    font-size: 24px;
    width: 40px;
    height: 40px;
    background: #007bff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-title {
    flex: 1;
}

.chat-name {
    font-weight: 600;
    color: #212529;
    display: block;
}

.chat-status {
    font-size: 12px;
    color: #28a745;
}

.chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    display: flex;
    flex-direction: column;
}

.user-message {
    align-items: flex-end;
}

.ai-message {
    align-items: flex-start;
}

.message-content {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.4;
    color: #212529;
}

.user-message .message-content {
    background: #007bff;
    color: white;
    border-bottom-right-radius: 4px;
}

.ai-message .message-content {
    background: #f8f9fa;
    border-bottom-left-radius: 4px;
}

.message-time {
    font-size: 11px;
    color: #6c757d;
    margin-top: 4px;
    padding: 0 16px;
}

.typing-indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 12px 16px;
    background: #f8f9fa;
    border-radius: 16px;
    border-bottom-left-radius: 4px;
    max-width: 80px;
}

.typing-indicator span {
    width: 6px;
    height: 6px;
    background: #6c757d;
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
    }
    30% {
        transform: translateY(-10px);
    }
}

.chat-input {
    padding: 16px 20px;
    border-top: 1px solid #e9ecef;
    display: flex;
    gap: 12px;
    background: white;
}

.chat-input input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid #ced4da;
    border-radius: 20px;
    outline: none;
    font-size: 14px;
}

.chat-input button {
    padding: 8px 16px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 20px;
    font-size: 14px;
    cursor: not-allowed;
    opacity: 0.6;
}

/* 聊天功能特色 */
.chat-capabilities {
    padding: 80px 0;
    background-color: var(--color-bg-default);
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.capability-card {
    padding: 32px;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.capability-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.capability-icon {
    font-size: 48px;
    margin-bottom: 16px;
    display: block;
}

.capability-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-text-primary);
}

.capability-card p {
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text-secondary);
}

/* 响应式设计 - 聊天功能 */
@media (max-width: 1200px) {
    .chat-demo {
        gap: 32px;
    }
    
    .chat-window {
        width: 350px;
        height: 450px;
    }
    
    .capabilities-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .chat-demo {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .chat-demo-content {
        text-align: center;
    }
    
    .chat-features-list {
        grid-template-columns: 1fr;
    }
    
    .chat-window {
        width: 100%;
        max-width: 350px;
        height: 400px;
    }
    
    .capabilities-grid {
        grid-template-columns: 1fr;
    }
    
    .chat-feature {
        padding: 60px 0;
    }
    
    .chat-capabilities {
        padding: 60px 0;
    }
}