/* 全新结构模版 CSS */
:root {
    --primary: #2563eb;       
    --primary-hover: #1d4ed8;
    --bg-light: #ffffff;
    --bg-alt: #f8fafc;
    --text-dark: #0f172a;
    --text-gray: #475569;
    --border: #e2e8f0;
    
    --shadow-sm: 0 4px 6px -1px rgba(0,0,0,0.05);
    --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1);
}

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

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

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

section { padding: 100px 0; }

.section-title {
    text-align: center;
    margin-bottom: 60px;
}
.section-title h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 10px;
}
.section-title p {
    font-size: 1.1rem;
    color: var(--text-gray);
}

/* 按钮通用 */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    text-align: center;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-outline:hover {
    background: #eff6ff;
}
.btn-large {
    padding: 18px 40px;
    font-size: 1.1rem;
    border-radius: 50px;
}

/* 悬浮导航栏 */
.floating-nav {
    position: fixed;
    top: 20px;
    left: 0; right: 0;
    z-index: 999;
}
.nav-inner {
    max-width: 1000px;
    margin: 0 auto;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: 50px;
    padding: 10px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}
.logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}
.nav-links {
    display: flex;
    gap: 30px;
}
.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.95rem;
}
.nav-links a:hover { color: var(--primary); }
.nav-btn {
    background: var(--text-dark);
    color: #fff;
    padding: 8px 20px;
}

/* 居中大视觉区 Hero */
.hero-section {
    padding: 180px 0 100px;
    background: linear-gradient(180deg, #eff6ff 0%, #ffffff 100%);
    text-align: center;
}
.hero-center {
    max-width: 900px;
    margin: 0 auto;
}
.badge {
    display: inline-block;
    padding: 6px 16px;
    background: #dbeafe;
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 25px;
}
.hero-center h1 {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 25px;
    letter-spacing: -1px;
}
.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 40px;
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
}
.stat-box {
    display: flex;
    align-items: center;
    gap: 15px;
    text-align: left;
}
.stat-box .emoji {
    font-size: 2.5rem;
}
.stat-box strong { font-size: 1.2rem; color: var(--text-dark); }
.stat-box div { font-size: 0.9rem; color: var(--text-gray); }

/* Z字交替排版 Features */
.split-features-section { background: var(--bg-light); }
.split-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    margin-bottom: 80px;
}
.split-row.reverse {
    flex-direction: row-reverse;
}
.split-text { flex: 1; }
.split-text h3 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 20px;
}
.split-text p {
    font-size: 1.1rem;
    color: var(--text-gray);
}
.split-visual {
    flex: 1;
    height: 350px;
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
    box-shadow: var(--shadow-lg);
}
.color-1 { background: linear-gradient(135deg, #bfdbfe 0%, #60a5fa 100%); }
.color-2 { background: linear-gradient(135deg, #fbcfe8 0%, #f472b6 100%); }
.color-3 { background: linear-gradient(135deg, #bbf7d0 0%, #4ade80 100%); }

/* 宽卡片流媒体区 */
.wide-cards-section { background: var(--bg-alt); }
.wide-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}
.wide-card {
    background: #fff;
    padding: 40px;
    border-radius: 20px;
    border: 1px solid var(--border);
    display: flex;
    align-items: flex-start;
    gap: 25px;
    box-shadow: var(--shadow-sm);
}
.wc-icon { font-size: 3.5rem; }
.wc-text h3 { font-size: 1.5rem; margin-bottom: 15px; }
.wc-text p { color: var(--text-gray); }

/* 阶梯式价格套餐 (Flex 居中换行) */
.pricing-tier-section { background: var(--bg-light); }
.pricing-flex {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}
.tier-card {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px 30px;
    width: 320px;
    display: flex;
    flex-direction: column;
}
.tier-card h4 { font-size: 1.3rem; color: var(--text-gray); font-weight: 600; margin-bottom: 10px; }
.tier-price { font-size: 2.8rem; font-weight: 800; margin-bottom: 25px; color: var(--text-dark); }
.tier-price span { font-size: 1rem; font-weight: 400; color: var(--text-gray); }
.tier-features { list-style: none; flex-grow: 1; margin-bottom: 30px; }
.tier-features li { padding: 10px 0; border-bottom: 1px solid var(--border); color: var(--text-dark); }
.tier-card.featured {
    background: #fff;
    border: 2px solid var(--primary);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
    position: relative;
    z-index: 10;
}
.featured-label {
    position: absolute;
    top: -14px; left: 50%; transform: translateX(-50%);
    background: var(--primary); color: #fff;
    padding: 4px 16px; border-radius: 20px; font-weight: bold; font-size: 0.9rem;
}

/* 列表式文章布局 */
.articles-list-section { background: var(--bg-alt); }
.list-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}
.list-item {
    display: flex;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 16px;
    text-decoration: none;
    color: inherit;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}
.list-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}
.li-thumb {
    width: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}
.t-1 { background: #e0e7ff; }
.t-2 { background: #ffedd5; }
.t-3 { background: #dcfce7; }
.li-text {
    padding: 25px;
    flex: 1;
}
.li-text h3 { font-size: 1.2rem; margin-bottom: 10px; }
.li-text p { color: var(--text-gray); font-size: 0.95rem; }

/* FAQ 双列布局 */
.faq-section { background: var(--bg-light); }
.faq-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}
.faq-box {
    background: var(--bg-alt);
    padding: 30px;
    border-radius: 12px;
}
.faq-box h4 { font-size: 1.15rem; margin-bottom: 10px; }
.faq-box p { color: var(--text-gray); }

/* 评价 瀑布流/并排感 */
.reviews-section { background: var(--bg-alt); }
.review-masonry {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.review-card {
    background: #fff;
    padding: 35px;
    border-radius: 16px;
    border: 1px solid var(--border);
}
.r-stars { margin-bottom: 15px; font-size: 1.2rem; }
.r-text { font-style: italic; color: var(--text-gray); margin-bottom: 20px; line-height: 1.7; }
.r-author { font-weight: bold; }

/* 极简底部 */
.site-footer {
    background: var(--text-dark);
    color: #cbd5e1;
    padding: 60px 0 40px;
    text-align: center;
}
.footer-nav { display: flex; justify-content: center; gap: 30px; margin-bottom: 30px; }
.footer-nav a { color: #fff; text-decoration: none; font-weight: 500; }
.copyright { margin-bottom: 30px; font-size: 0.9rem; opacity: 0.7; }
.pbn-links {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 25px;
    font-size: 0.9rem;
}
.pbn-label { color: #64748b; margin-right: 15px; }
.pbn-links a {
    color: #38bdf8;
    text-decoration: none;
    font-weight: bold;
    margin: 0 10px;
}

/* 独立页面通用样式 */
.page-header { background: var(--bg-alt); padding: 150px 0 80px; text-align: center; }
.page-header h1 { font-size: 2.5rem; color: var(--text-dark); }
.page-content { background: #fff; padding: 50px; border-radius: 16px; margin: -30px auto 80px; max-width: 900px; box-shadow: var(--shadow-sm); border: 1px solid var(--border); }
.page-content h2 { font-size: 1.6rem; margin: 40px 0 20px; }
.page-content p { color: var(--text-gray); margin-bottom: 15px; font-size: 1.05rem; }
.page-content a { color: var(--primary); text-decoration: none; font-weight: 600; }
.page-content a.btn-primary { color: #fff; }
.page-content a:hover { text-decoration: underline; }
.page-content a.btn:hover { text-decoration: none; }

/* 响应式调整 */
@media (max-width: 900px) {
    .split-row, .split-row.reverse { flex-direction: column; gap: 30px; text-align: center; }
    .split-visual { width: 100%; height: 250px; }
    .wide-grid, .faq-grid, .review-masonry { grid-template-columns: 1fr; }
    .hero-center h1 { font-size: 2.8rem; }
    .hero-stats { flex-direction: column; align-items: center; gap: 20px; }
    .tier-card { width: 100%; }
    .tier-card.featured { transform: scale(1); }
    .floating-nav { padding: 0 15px; }
    .nav-inner { border-radius: 12px; flex-wrap: wrap; padding: 15px; }
    .nav-links { display: none; }
    .list-item { flex-direction: column; }
    .li-thumb { width: 100%; height: 120px; }
}