/* 项目4-开发者友好主题 - 蓝灰配色 */

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

body {
    font-family: 'Monaco', 'Courier New', monospace, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
}

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

/* ========== 导航栏 ========== */
.navbar {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

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

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: #3498db;
    font-family: 'Monaco', monospace;
}

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

.nav-menu a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
}

.nav-menu a:hover {
    color: #3498db;
}

/* ========== 英雄区域 ========== */
.hero {
    background: linear-gradient(135deg, #1a252f 0%, #2c3e50 100%);
    color: white;
    padding: 5rem 2rem;
    text-align: center;
    min-height: 500px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    font-family: 'Monaco', monospace;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    max-width: 600px;
}

.hero .cta-button {
    display: inline-block;
    background: #3498db;
    color: white;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.hero .cta-button:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

/* ========== 特性区域 ========== */
.features {
    padding: 4rem 2rem;
    background: white;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background: #ecf0f1;
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid #3498db;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(52, 152, 219, 0.15);
    background: #e8eef5;
}

.feature-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.3rem;
    font-weight: 600;
}

.feature-card p {
    color: #555;
    line-height: 1.8;
}

/* ========== 代码展示 ========== */
.code-block {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1rem 0;
    overflow-x: auto;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

.code-block code {
    color: #3498db;
}

/* ========== 常见问题 ========== */
.faq {
    padding: 4rem 2rem;
    background: #f5f7fa;
}

.faq h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.faq-container {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    margin-bottom: 1rem;
    border-radius: 8px;
    border: 1px solid #bdc3c7;
    overflow: hidden;
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    background: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s ease;
    font-weight: 600;
    color: #2c3e50;
}

.faq-question:hover {
    background: #ecf0f1;
}

.faq-question.active {
    background: #d6eaf8;
}

.faq-toggle {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.faq-toggle.active {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding: 0 1.5rem;
    color: #555;
    line-height: 1.8;
}

.faq-answer.active {
    max-height: 500px;
    padding: 1.5rem;
}

/* ========== 页脚 ========== */
.footer {
    background: linear-gradient(135deg, #1a252f 0%, #2c3e50 100%);
    color: white;
    padding: 3rem 2rem 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: #3498db;
}

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

.footer-section a {
    color: #bdc3c7;
    text-decoration: none;
    display: block;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #3498db;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #95a5a6;
}

/* ========== 下载按钮 ========== */
.download-btn {
    display: inline-block;
    background: #3498db;
    color: white;
    padding: 0.8rem 2rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    margin: 0.5rem;
}

.download-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

/* ========== 媒体查询 ========== */
/* 平板设备 (768px) */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .nav-menu {
        gap: 1rem;
    }

    .features h2,
    .faq h2 {
        font-size: 2rem;
    }

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

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

/* 手机设备 (480px) */
@media (max-width: 480px) {
    .hero {
        padding: 3rem 1rem;
        min-height: auto;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero p {
        font-size: 0.95rem;
    }

    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.8rem;
    }

    .nav-menu a {
        font-size: 0.9rem;
    }

    .hero .cta-button {
        padding: 0.8rem 1.5rem;
        font-size: 0.95rem;
    }

    .features,
    .faq {
        padding: 2rem 1rem;
    }

    .features h2,
    .faq h2 {
        font-size: 1.5rem;
    }

    .feature-card {
        padding: 1.5rem;
    }

    .faq-question {
        font-size: 0.95rem;
        padding: 1rem;
    }

    .faq-answer {
        font-size: 0.9rem;
    }

    .code-block {
        font-size: 0.8rem;
        padding: 1rem;
    }

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

    .footer-section h4 {
        font-size: 1rem;
    }

    .footer-section a {
        font-size: 0.9rem;
    }
}