/* 基础重置 */
:root {
    --primary-color: #4A90E2;
    --primary-hover: #357ABD;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #fff;
    --bg-light: #f8f9fa;
    --border-color: #eaeaea;
}

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

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

a {
    text-decoration: none;
    color: inherit;
}

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

.text-center {
    text-align: center;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
    border: 2px solid var(--primary-color);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-large {
    padding: 15px 40px;
    font-size: 18px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.3);
}

.btn-large:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 144, 226, 0.4);
}

/* 导航栏 */
.navbar {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    background-color: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links a {
    margin: 0 15px;
    color: var(--text-color);
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* 页面通用段落 */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 32px;
    margin-bottom: 50px;
    color: #1a1a1a;
}

.bg-light {
    background-color: var(--bg-light);
}

/* 头部主视觉区 */
.hero {
    padding: 120px 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4ebf5 100%);
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    color: #111;
}

.hero .subtitle {
    font-size: 20px;
    color: var(--text-light);
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* 网格布局 */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

/* 卡片样式 */
.card {
    background: #fff;
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    text-align: center;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card .icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.card h3 {
    font-size: 22px;
    margin-bottom: 15px;
}

.card p {
    color: var(--text-light);
}

.media-card, .ai-card {
    text-align: left;
    padding: 50px 40px;
}

.media-card h3, .ai-card h3 {
    font-size: 24px;
    margin-bottom: 20px;
}

/* 价格表 */
.pricing-table {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    align-items: center;
}

.pricing-card {
    background: #fff;
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    text-align: center;
    border: 1px solid var(--border-color);
    position: relative;
}

.pricing-card.popular {
    transform: scale(1.05);
    border: 2px solid var(--primary-color);
    box-shadow: 0 10px 30px rgba(74, 144, 226, 0.15);
    z-index: 10;
}

.pricing-card .badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: #fff;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: bold;
}

.pricing-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
}

.pricing-card .price {
    font-size: 20px;
    color: var(--text-light);
    margin-bottom: 30px;
}

.features-list {
    list-style: none;
    margin-bottom: 30px;
    text-align: left;
}

.features-list li {
    margin-bottom: 12px;
    color: #444;
}

/* 评价卡片 */
.review-card {
    background: #fdfdfd;
    padding: 30px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.review-text {
    font-style: italic;
    margin-bottom: 20px;
    color: #555;
}

.reviewer {
    font-weight: bold;
    color: #222;
}

/* FAQ 列表 */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 30px;
    background: #fff;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}

.faq-item h4 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #222;
}

.faq-item p {
    color: var(--text-light);
}

/* 页脚 */
.footer {
    padding: 40px 0;
    background: #222;
    color: #fff;
}

.footer-links {
    margin-bottom: 20px;
}

.footer-links a {
    color: #ccc;
    margin: 0 10px;
}

.footer-links a:hover {
    color: #fff;
}

.copyright {
    color: #888;
    font-size: 14px;
}

/* 媒体查询 (响应式) */
@media (max-width: 992px) {
    .pricing-table {
        grid-template-columns: repeat(1, 1fr);
        max-width: 500px;
        margin: 0 auto;
    }
    
    .pricing-card.popular {
        transform: scale(1);
    }
}

@media (max-width: 768px) {
    .grid-3, .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .navbar .nav-links {
        display: none; /* 移动端简化隐藏导航，保留按钮即可 */
    }
    
    .hero {
        padding: 80px 0;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .section {
        padding: 50px 0;
    }
    
    /* 按钮适合手指点击 */
    .btn {
        padding: 12px 20px;
        width: 100%;
        margin-bottom: 10px;
    }
    
    .navbar .btn {
        width: auto;
        padding: 8px 16px;
        margin-bottom: 0;
    }

    .btn-large {
        width: 100%;
        padding: 15px;
    }
}

/* =========================================================
   M78星云 视觉风格覆盖 (增量修改)
   ========================================================= */
:root {
    --primary-color: #93C5FD;
    --primary-hover: #608CF8;
    --text-color: #F1F5F9;
    --text-light: #94A3B8;
    --bg-color: transparent;
    --bg-light: rgba(16, 27, 62, 0.3);
    --border-color: rgba(147, 197, 253, 0.15);
    --accent-color: #A78BFA;
}

body {
    background-color: #05081E;
}

.navbar { background-color: rgba(5, 8, 30, 0.8); backdrop-filter: blur(10px); }
.hero { background: transparent; }
.hero h1 { color: #FFFFFF; text-shadow: 0 0 20px rgba(147, 197, 253, 0.3); }
.section-title { color: #FFFFFF; text-shadow: 0 0 15px rgba(147, 197, 253, 0.3); }
.card, .pricing-card, .faq-item, .review-card, .content-section, .article-card { 
    background: rgba(16, 27, 62, 0.5); 
    backdrop-filter: blur(5px); 
}

.faq-item h4, .reviewer, .pricing-card h3, .card h3, .media-card h3, .ai-card h3, .content-section h2, .article-card h2 { color: var(--primary-color); }
.features-list li, .review-text, .content-section p, .content-section ul, .article-card p { color: var(--text-color); }

.btn-primary { color: #05081E; font-weight: bold; }
.btn-primary:hover { color: #05081E; }
.btn-outline { color: var(--primary-color); border-color: var(--primary-color); }
.btn-outline:hover { background-color: rgba(147, 197, 253, 0.1); }

.pricing-card.popular { border-color: var(--accent-color); box-shadow: 0 10px 30px rgba(167, 139, 250, 0.2); }
.pricing-card .badge { background: var(--accent-color); color: #fff; }


/* Phase 2 SEO & Accessibility Updates */
section { scroll-margin-top: 80px; }
.btn { min-height: 44px; min-width: 44px; display: inline-flex; align-items: center; justify-content: center; }
details.faq-item { cursor: pointer; }
details.faq-item summary { list-style: none; outline: none; }
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary h4 { display: inline-block; margin-bottom: 0; }
details.faq-item p { margin-top: 15px; }