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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #2c3e50;
    background-color: #ffffff;
}

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

/* 导航栏 - 简洁商务风格 */
.navbar {
    background: #ffffff;
    padding: 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    border-bottom: 1px solid #e8e8e8;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    color: #1e40af;
    font-size: 1.4rem;
    font-weight: 600;
}

.logo i {
    margin-right: 12px;
    font-size: 1.6rem;
    color: #2563eb;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-links a {
    color: #374151;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s;
    position: relative;
    padding: 8px 0;
}

.nav-links a:hover {
    color: #2563eb;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #2563eb;
    transition: width 0.3s;
}

.nav-links a:hover::after {
    width: 100%;
}

/* 主页横幅 - 专业商务风格 */
.hero {
    background: linear-gradient(to bottom, #f8fafc 0%, #e0f2fe 50%, #f0f9ff 100%);
    color: #1e293b;
    padding: 140px 0 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: auto;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -100px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -150px;
    left: -80px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-content {
    max-width: 800px;
    text-align: center;
    padding: 0 20px;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 24px;
    color: #0f172a;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.35rem;
    margin-bottom: 14px;
    color: #1e40af;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.description {
    font-size: 1.1rem;
    margin-bottom: 42px;
    color: #64748b;
    line-height: 1.8;
}

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

/* 按钮样式 - 商务风格 */
.btn {
    padding: 14px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.btn-primary {
    background: #2563eb;
    color: white;
    box-shadow: 0 1px 3px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-secondary {
    background: transparent;
    color: #2563eb;
    border: 1.5px solid #2563eb;
}

.btn-secondary:hover {
    background: #2563eb;
    color: white;
}

.btn-download {
    background: #2563eb;
    color: white;
    padding: 16px 40px;
    font-size: 1.05rem;
}

.btn-download:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
}

/* 区块标题 - 商务风格 */
.section-title {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 12px;
    color: #0f172a;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.section-subtitle {
    text-align: center;
    font-size: 1.05rem;
    color: #64748b;
    margin-bottom: 50px;
}

/* 功能特点 - 商务风格 */
.features {
    padding: 80px 0;
    background: #ffffff;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
}

.feature-card {
    background: #f8fafc;
    padding: 36px 28px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s;
    border: 1px solid #e2e8f0;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: #2563eb;
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.12);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: #eff6ff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.8rem;
    color: #2563eb;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: #0f172a;
    font-weight: 600;
}

.feature-card p {
    color: #64748b;
    line-height: 1.7;
    font-size: 0.95rem;
}

/* 使用教程 - 商务风格 */
.tutorial {
    padding: 80px 0;
    background: #f8fafc;
}

.tutorial-link-box {
    text-align: center;
    margin-bottom: 50px;
}

.btn-tutorial {
    background: #2563eb;
    color: white;
    padding: 16px 40px;
    font-size: 1.05rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s;
    box-shadow: 0 1px 3px rgba(37, 99, 235, 0.3);
}

.btn-tutorial:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.25);
}

.tutorial-steps {
    max-width: 900px;
    margin: 0 auto;
}

.tutorial-step {
    display: flex;
    gap: 24px;
    margin-bottom: 32px;
    align-items: flex-start;
}

.step-number {
    width: 56px;
    height: 56px;
    background: #2563eb;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
    background: white;
    padding: 28px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    border: 1px solid #e2e8f0;
}

.step-content h3 {
    font-size: 1.25rem;
    margin-bottom: 14px;
    color: #0f172a;
    font-weight: 600;
}

.step-content ul {
    list-style: none;
    padding-left: 0;
}

.step-content li {
    padding: 6px 0;
    padding-left: 24px;
    position: relative;
    color: #64748b;
    font-size: 0.95rem;
}

.step-content li:before {
    content: "•";
    color: #2563eb;
    font-size: 1.3rem;
    position: absolute;
    left: 0;
}

/* AI集成 - 商务风格 */
.ai-integration {
    max-width: 900px;
    margin: 50px auto 0;
    background: white;
    padding: 36px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    border: 1px solid #e2e8f0;
}

.ai-integration h3 {
    font-size: 1.35rem;
    margin-bottom: 16px;
    color: #0f172a;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
}

.ai-note {
    color: #475569;
    margin-bottom: 28px;
    padding: 16px;
    background: #fffbeb;
    border-radius: 8px;
    border-left: 3px solid #f59e0b;
    font-size: 0.95rem;
    line-height: 1.7;
}

.ai-providers {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

.provider-card {
    background: #f8fafc;
    padding: 24px;
    border-radius: 10px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s;
}

.provider-card:hover {
    border-color: #2563eb;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.1);
}

.provider-card h4 {
    font-size: 1.1rem;
    margin-bottom: 14px;
    color: #0f172a;
    font-weight: 600;
}

.provider-card p {
    color: #64748b;
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.provider-card a {
    display: inline-block;
    margin-top: 8px;
    color: #2563eb;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
}

.provider-card a:hover {
    text-decoration: underline;
}

/* 检查功能列表 - 商务风格 */
.check-features {
    padding: 80px 0;
    background: white;
}

.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    max-width: 900px;
    margin: 0 auto;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 20px;
    background: #f8fafc;
    border-radius: 8px;
    transition: all 0.3s;
    border: 1px solid #e2e8f0;
}

.feature-item:hover {
    background: #eff6ff;
    border-color: #2563eb;
}

.feature-item i {
    font-size: 1.3rem;
    color: #2563eb;
}

.feature-item span {
    color: #334155;
    font-weight: 500;
    font-size: 0.95rem;
}

.membership-note {
    text-align: center;
    margin-top: 36px;
    padding: 18px;
    background: #eff6ff;
    border-radius: 8px;
    color: #475569;
    font-size: 0.95rem;
    border: 1px solid #dbeafe;
}

.membership-note i {
    color: #f59e0b;
    margin-right: 8px;
}

/* 常见问题 - 商务风格 */
.faq {
    padding: 80px 0;
    background: #f8fafc;
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    margin-bottom: 16px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    border: 1px solid #e2e8f0;
}

.faq-question {
    padding: 22px;
    display: flex;
    align-items: center;
    gap: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.faq-question:hover {
    background: #f8fafc;
}

.faq-question i {
    font-size: 1.3rem;
    color: #2563eb;
}

.faq-question span {
    font-size: 1.05rem;
    font-weight: 600;
    color: #0f172a;
}

.faq-answer {
    padding: 0 22px 22px;
    padding-left: 56px;
    color: #64748b;
    line-height: 1.7;
    font-size: 0.95rem;
}

.faq-answer p {
    margin-bottom: 10px;
}

/* 页脚 - 商务风格 */
.footer {
    background: #0f172a;
    color: white;
    padding: 60px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 36px;
}

.footer-section h4 {
    font-size: 1.15rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.footer-section p {
    color: #94a3b8;
    line-height: 1.8;
    font-size: 0.95rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section a {
    color: #94a3b8;
    text-decoration: none;
    transition: all 0.3s;
    font-size: 0.95rem;
}

.footer-section a:hover {
    color: #60a5fa;
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid #1e293b;
    color: #64748b;
    font-size: 0.9rem;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding: 120px 0 80px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .description {
        font-size: 1rem;
        margin-bottom: 32px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

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

    .tutorial-step {
        flex-direction: column;
    }

    .step-number {
        margin: 0 auto;
    }

    .ai-providers {
        grid-template-columns: 1fr;
    }

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

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