/* ==================== 基础样式 ==================== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; 
    line-height: 1.6; 
    color: #1d1d1f; 
    background: #fff; 
    -webkit-font-smoothing: antialiased;
}
a { color: #0066cc; text-decoration: none; transition: color 0.2s; }
a:hover { text-decoration: none; color: #0055aa; }

/* ==================== 导航栏 ==================== */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.35);
}
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 980px;
    margin: 0 auto;
    padding: 0.85rem 0;
}
.logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: #fff;
    letter-spacing: -0.3px;
    text-decoration: none;
    transition: opacity 0.2s;
}
.logo:hover { opacity: 0.88; text-decoration: none; color: #fff; }
.nav-links { display: flex; align-items: center; gap: 0.25rem; }
.nav-links a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    padding: 0.45rem 1.1rem;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.25s ease;
    position: relative;
}
.nav-links a:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.18);
    text-decoration: none;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: transform 0.25s ease;
}
.nav-links a:hover::after { transform: translateX(-50%) scaleX(1); }
.lang-switch {
    margin-left: auto;
    padding: 0 0.75rem;
    font-size: 0.88rem;
    white-space: nowrap;
    border-left: 1px solid rgba(255,255,255,0.25);
}
.lang-switch a { color: rgba(255, 255, 255, 0.75); text-decoration: none; padding: 0.2rem 0.5rem; border-radius: 4px; transition: all 0.2s; font-weight: 500; }
.lang-switch a:hover { color: #fff; background: rgba(255,255,255,0.15); }
.lang-switch .lang-en { color: #a8d8ff; }
.lang-switch .lang-zh { color: #ffd4a8; }
.lang-switch .divider { color: rgba(255,255,255,0.3); }

/* ==================== 主内容区域 ==================== */
main { max-width: 980px; margin: 0 auto; padding: 0 1.5rem; }

/* ==================== Hero 区域 ==================== */
.hero {
    text-align: center;
    padding: 7rem 0 6rem;
    background: linear-gradient(180deg, #fbfbfd 0%, #fff 100%);
}
.hero-content { max-width: 680px; margin: 0 auto; }
.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: #1d1d1f;
    margin-bottom: 1.25rem;
}
.hero-subtitle {
    font-size: 1.35rem;
    color: #86868b;
    margin-bottom: 2.5rem;
    font-weight: 400;
    line-height: 1.5;
}
.hero-cta { display: flex; gap: 1rem; justify-content: center; }

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-block;
    padding: 0.85rem 2rem;
    border-radius: 980px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.25s ease;
    cursor: pointer;
}
/* ==================== 品牌展示 ==================== */
.brands {
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid #d2d2d7;
    border-bottom: 1px solid #d2d2d7;
    background: #f5f5f7;
}
.brands-label {
    font-size: 0.85rem;
    color: #86868b;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}
.brands-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2.5rem;
    font-size: 1.5rem;
    font-weight: 600;
}
.brand-link {
    color: #1d1d1f;
    opacity: 0.8;
    text-decoration: none;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 8px;
}
.brand-link:hover {
    opacity: 1;
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    text-decoration: none;
}

/* ==================== 文章区域 ==================== */
.articles {
    padding: 5rem 0;
    background: #f5f5f7;
}
.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}
.article-card {
    background: #fff;
    border-radius: 18px;
    padding: 2rem;
    transition: all 0.35s ease;
    cursor: pointer;
    text-decoration: none;
    display: block;
}
.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.08);
    text-decoration: none;
}
.article-card:hover h3 {
    color: #667eea;
}
.article-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #fff;
    background: #667eea;
    padding: 0.25rem 0.75rem;
    border-radius: 980px;
    margin-bottom: 1rem;
}
.article-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1d1d1f;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}
.article-card p {
    font-size: 0.9rem;
    color: #86868b;
    margin-bottom: 1rem;
    line-height: 1.5;
}
.article-card time {
    font-size: 0.8rem;
    color: #86868b;
}

/* ==================== CTA 区域 ==================== */
.cta {
    padding: 6rem 0;
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    margin: 0 -1.5rem;
}
.cta h2 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #fff;
}
.cta p {
    font-size: 1.15rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

/* ==================== Footer ==================== */
footer {
    padding: 3rem 1.5rem;
    background: #f5f5f7;
    border-top: 1px solid #d2d2d7;
}
.footer-content {
    max-width: 980px;
    margin: 0 auto;
    text-align: center;
}
.footer-brand {
    margin-bottom: 1.5rem;
}
.footer-logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1d1d1f;
}
.footer-brand p {
    font-size: 0.85rem;
    color: #86868b;
    margin-top: 0.25rem;
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}
.footer-links a {
    color: #515154;
    font-size: 0.9rem;
}
.footer-links a:hover { color: #0066cc; }
.footer-copy {
    font-size: 0.75rem;
    color: #86868b;
    padding-top: 1.5rem;
    border-top: 1px solid #d2d2d7;
}

/* ================================================================
   苹果风视觉体系 — 图片与版面协调性升级
   设计原则：简洁、通透、有呼吸感、高级感
   色彩：背景 #F5F5F7 / 正文 #1D1D1F / 强调 #FF6600
   ================================================================ */

/* ==================== CSS 变量 ==================== */
:root {
    --apple-bg: #F5F5F7;
    --apple-bg-alt: #FBFBFD;
    --apple-text: #1D1D1F;
    --apple-text-secondary: #86868b;
    --apple-accent: #FF6600;
    --apple-accent-light: rgba(255, 102, 0, 0.1);
    --apple-border: #d2d2d7;
    --apple-card: #FFFFFF;
    --apple-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    --apple-shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.10);
    --apple-radius: 16px;
    --apple-radius-sm: 10px;
    --apple-max-width: 980px;
}

/* ==================== 文章页面全局升级 ==================== */
.post {
    background: var(--apple-card);
    padding: 3rem 3.5rem;
    border-radius: var(--apple-radius);
    box-shadow: var(--apple-shadow);
    max-width: var(--apple-max-width);
    margin: 2.5rem auto;
}
.post h1 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--apple-text);
    margin-bottom: 0.5rem;
    line-height: 1.15;
}
.post .meta {
    color: var(--apple-text-secondary);
    font-size: 0.9rem;
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--apple-border);
}
.post .content {
    line-height: 1.85;
    font-size: 1.05rem;
    color: var(--apple-text);
}
.post .content p {
    margin-bottom: 1.5rem;
}
.post h2 {
    font-size: 1.65rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--apple-text);
    margin: 3rem 0 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--apple-accent);
}
.post h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--apple-text);
    margin: 2rem 0 0.75rem;
}
.post h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--apple-text);
    margin: 1.5rem 0 0.5rem;
}
.post .content a {
    color: var(--apple-accent);
    border-bottom: 1px solid rgba(255, 102, 0, 0.3);
    transition: all 0.2s ease;
}
.post .content a:hover {
    color: #e55c00;
    border-bottom-color: var(--apple-accent);
}

/* ==================== 图片规格体系 ==================== */

/* 1. 内容主图 — 最大800px，视觉焦点，居中 */
.img-hero,
figure.img-hero {
    margin: 2.5rem auto;
    max-width: 800px;
    text-align: center;
}
.img-hero img,
figure.img-hero img {
    max-width: 100%;
    height: auto;
    border-radius: var(--apple-radius);
    box-shadow: var(--apple-shadow);
    transition: transform 0.35s ease, box-shadow 0.35s ease;
}
.img-hero img:hover,
figure.img-hero img:hover {
    transform: scale(1.01);
    box-shadow: var(--apple-shadow-hover);
}
.img-hero figcaption,
figure.img-hero figcaption {
    font-size: 0.88rem;
    color: var(--apple-text-secondary);
    text-align: center;
    margin-top: 0.75rem;
    font-style: normal;
}

/* 2. 步骤/流程插图 — 最大600px */
.img-step,
figure.img-step {
    margin: 2rem auto;
    max-width: 600px;
}
.img-step img,
figure.img-step img {
    max-width: 100%;
    height: auto;
    border-radius: var(--apple-radius-sm);
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease;
}
.img-step img:hover,
figure.img-step img:hover {
    transform: translateY(-2px);
    box-shadow: var(--apple-shadow);
}
.img-step figcaption,
figure.img-step figcaption {
    font-size: 0.85rem;
    color: var(--apple-text-secondary);
    margin-top: 0.6rem;
    font-style: normal;
}

/* 3. 数据图表/对比 — 宽度与正文一致 */
.img-chart,
figure.img-chart {
    margin: 2rem 0;
    text-align: center;
}
.img-chart img,
figure.img-chart img {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: var(--apple-radius-sm);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
}
.img-chart figcaption,
figure.img-chart figcaption {
    font-size: 0.85rem;
    color: var(--apple-text-secondary);
    margin-top: 0.6rem;
    font-style: normal;
}

/* 4. 细节/特写图 — 最大400px，嵌入段落或侧边 */
.img-detail,
figure.img-detail {
    margin: 1.5rem auto;
    max-width: 400px;
    display: block;
}
.img-detail img,
figure.img-detail img {
    max-width: 100%;
    height: auto;
    border-radius: var(--apple-radius-sm);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(0, 0, 0, 0.04);
    transition: transform 0.25s ease;
}
.img-detail img:hover,
figure.img-detail img:hover {
    transform: scale(1.02);
}
.img-detail figcaption,
figure.img-detail figcaption {
    font-size: 0.8rem;
    color: var(--apple-text-secondary);
    margin-top: 0.5rem;
    font-style: normal;
}

/* 5. 对比图 — Before/After 并列 */
.img-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin: 2.5rem 0;
    align-items: start;
}
.img-comparison .comparison-side {
    position: relative;
    border-radius: var(--apple-radius-sm);
    overflow: hidden;
    box-shadow: var(--apple-shadow);
}
.img-comparison .comparison-side img {
    width: 100%;
    height: auto;
    display: block;
}
.img-comparison .comparison-side .comparison-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.6rem 1rem;
    text-align: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: #fff;
    letter-spacing: 0.5px;
}
.img-comparison .comparison-side.before .comparison-label {
    background: rgba(220, 53, 69, 0.85);
}
.img-comparison .comparison-side.after .comparison-label {
    background: rgba(40, 167, 69, 0.85);
}
.img-comparison figcaption {
    grid-column: 1 / -1;
    font-size: 0.85rem;
    color: var(--apple-text-secondary);
    text-align: center;
    margin-top: 0.5rem;
}

/* 6. 图片网格 — 多图并列 */
.img-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}
.img-gallery figure,
.img-gallery .gallery-item {
    margin: 0;
}
.img-gallery img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-radius: var(--apple-radius-sm);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}
.img-gallery img:hover {
    transform: translateY(-3px);
    box-shadow: var(--apple-shadow-hover);
}
.img-gallery figcaption {
    font-size: 0.8rem;
    color: var(--apple-text-secondary);
    text-align: center;
    margin-top: 0.5rem;
}

/* ==================== 图文排版布局 ==================== */

/* 左图右文 */
.layout-img-left {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 2rem;
    align-items: center;
    margin: 2.5rem 0;
}
.layout-img-left > :first-child img {
    width: 100%;
    height: auto;
    border-radius: var(--apple-radius);
    box-shadow: var(--apple-shadow);
}

/* 右图左文 */
.layout-img-right {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 2rem;
    align-items: center;
    margin: 2.5rem 0;
}
.layout-img-right > :last-child img {
    width: 100%;
    height: auto;
    border-radius: var(--apple-radius);
    box-shadow: var(--apple-shadow);
}

/* 上图下文 — 居中通栏 */
.layout-img-top {
    margin: 2.5rem 0;
    text-align: center;
}
.layout-img-top img {
    max-width: 100%;
    height: auto;
    border-radius: var(--apple-radius);
    box-shadow: var(--apple-shadow);
    margin-bottom: 1.5rem;
}

/* 图文卡片 */
.img-card {
    background: var(--apple-bg);
    border-radius: var(--apple-radius);
    overflow: hidden;
    box-shadow: var(--apple-shadow);
    margin: 2rem 0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.img-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--apple-shadow-hover);
}
.img-card img {
    width: 100%;
    height: auto;
    display: block;
}
.img-card .card-body {
    padding: 1.5rem 1.75rem;
}
.img-card .card-body h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--apple-text);
    margin-bottom: 0.5rem;
}
.img-card .card-body p {
    font-size: 0.9rem;
    color: var(--apple-text-secondary);
    line-height: 1.6;
}

/* ==================== 苹果风内容组件升级 ==================== */
.warning-box {
    background: #FFF8F0;
    border-left: 4px solid var(--apple-accent);
    border-radius: var(--apple-radius-sm);
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    font-size: 0.95rem;
    line-height: 1.6;
}
.important-box {
    background: #FFF0F0;
    border-left: 4px solid #E53935;
    border-radius: var(--apple-radius-sm);
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    font-size: 0.95rem;
    line-height: 1.6;
}
.success-box {
    background: #F0FFF4;
    border-left: 4px solid #2E7D32;
    border-radius: var(--apple-radius-sm);
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    font-size: 0.95rem;
    line-height: 1.6;
}
.info-box {
    background: #F0F7FF;
    border-left: 4px solid #1565C0;
    border-radius: var(--apple-radius-sm);
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    font-size: 0.95rem;
    line-height: 1.6;
}
.case-box {
    background: #F8F6FF;
    border-left: 4px solid #5C6BC0;
    border-radius: var(--apple-radius-sm);
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ==================== 表格苹果风升级 ==================== */
.spec-table,
.compare-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 2rem 0;
    font-size: 0.9rem;
    border-radius: var(--apple-radius-sm);
    overflow: hidden;
    box-shadow: var(--apple-shadow);
    border: 1px solid var(--apple-border);
}
.spec-table th,
.compare-table th {
    background: var(--apple-text);
    color: #fff;
    padding: 0.85rem 1.25rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 0.3px;
}
.spec-table td,
.compare-table td {
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid #f0f0f0;
    background: var(--apple-card);
}
.spec-table tr:nth-child(even) td,
.compare-table tr:nth-child(even) td {
    background: var(--apple-bg);
}
.spec-table tr:last-child td,
.compare-table tr:last-child td {
    border-bottom: none;
}
.spec-table tr:hover td,
.compare-table tr:hover td {
    background: var(--apple-accent-light);
}
.compare-table .good { color: #2E7D32; font-weight: 600; }
.compare-table .bad { color: #E53935; font-weight: 600; }

/* ==================== 流程步骤升级 ==================== */
.step-list {
    counter-reset: step;
    list-style: none;
    padding: 0;
    margin: 2rem 0;
}
.step-list li {
    counter-increment: step;
    padding: 1rem 1rem 1rem 4rem;
    position: relative;
    border-left: 2px solid #e0e0e0;
    margin-left: 1rem;
    min-height: 3rem;
}
.step-list li::before {
    content: counter(step);
    position: absolute;
    left: -1.1rem;
    width: 2.2rem;
    height: 2.2rem;
    background: var(--apple-accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    box-shadow: 0 2px 8px rgba(255, 102, 0, 0.25);
}
.step-list li:first-child {
    border-top: 2px solid var(--apple-accent);
    padding-top: 1.5rem;
}
.step-list li:last-child {
    border-left-color: transparent;
}

/* ==================== 产品图片组升级 ==================== */
.product-images {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}
.product-images img {
    width: 100%;
    height: auto;
    border-radius: var(--apple-radius-sm);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    object-fit: cover;
}
.product-images img:hover {
    transform: translateY(-3px);
    box-shadow: var(--apple-shadow-hover);
}

/* ==================== 通用图片适配 ==================== */
.post .content figure {
    margin: 2rem 0;
}
.post .content figure img {
    border-radius: var(--apple-radius-sm);
    box-shadow: var(--apple-shadow);
}
.post .content figcaption {
    font-size: 0.85rem;
    color: var(--apple-text-secondary);
    text-align: center;
    margin-top: 0.75rem;
    line-height: 1.5;
}
.article-img,
.article-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--apple-radius-sm);
    margin: 2rem 0;
    box-shadow: var(--apple-shadow);
    transition: transform 0.3s ease;
}
.article-img:hover,
.article-image:hover {
    transform: translateY(-2px);
}
.article-image img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: var(--apple-radius-sm);
}
.img-caption,
.image-caption {
    font-size: 0.85rem;
    color: var(--apple-text-secondary);
    text-align: center;
    margin-top: 0.6rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

/* ==================== 分隔线/引用/代码 — 苹果风 ==================== */
.post .content hr {
    border: none;
    height: 1px;
    background: var(--apple-border);
    margin: 3rem 0;
}
.post .content blockquote {
    border-left: 4px solid var(--apple-accent);
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    background: var(--apple-bg);
    border-radius: 0 var(--apple-radius-sm) var(--apple-radius-sm) 0;
    color: var(--apple-text);
    font-style: normal;
}
.post .content code {
    background: var(--apple-bg);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--apple-accent);
}
.post .content pre {
    background: #1d1d1f;
    color: #f5f5f7;
    padding: 1.5rem;
    border-radius: var(--apple-radius-sm);
    overflow-x: auto;
    margin: 2rem 0;
}
.post .content pre code {
    background: none;
    color: inherit;
    padding: 0;
}

/* ==================== FAQ 升级 ==================== */
.faq-item {
    border: 1px solid var(--apple-border);
    border-radius: var(--apple-radius-sm);
    margin: 1rem 0;
    overflow: hidden;
    transition: box-shadow 0.25s ease;
}
.faq-item:hover {
    box-shadow: var(--apple-shadow);
}
.faq-q {
    background: var(--apple-bg);
    padding: 1rem 1.5rem;
    font-weight: 600;
    color: var(--apple-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.faq-q::before {
    content: "Q";
    background: var(--apple-accent);
    color: #fff;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
    flex-shrink: 0;
}
.faq-a {
    padding: 1rem 1.5rem;
    background: var(--apple-card);
    border-top: 1px solid var(--apple-border);
    color: #444;
    line-height: 1.75;
}
.faq-a::before {
    content: "A：";
    font-weight: 600;
    color: var(--apple-accent);
}

/* ==================== 按钮苹果风 ==================== */
.btn-primary {
    background: var(--apple-accent);
    color: #fff !important;
}
.btn-primary:hover {
    background: #e55c00;
    transform: scale(1.02);
}

/* ==================== 首页核心布局 ==================== */
.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    text-align: center;
    letter-spacing: -0.02em;
    color: #1d1d1f;
    margin-bottom: 0.5rem;
}
.section-subtitle {
    font-size: 1.15rem;
    color: #86868b;
    text-align: center;
    margin-bottom: 3rem;
    font-weight: 400;
}
.products { padding: 5rem 0; background: #fff; }
.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}
.product-card {
    background: #f5f5f7;
    border-radius: 18px;
    padding: 2.5rem 2rem;
    text-align: center;
    transition: all 0.35s ease;
}
.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.08);
}
.product-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--apple-accent, #FF6600);
}
.product-card h3 {
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #1d1d1f;
}
.product-card p {
    font-size: 0.95rem;
    color: #86868b;
    margin-bottom: 1.25rem;
    line-height: 1.5;
}
.product-card ul {
    list-style: none;
    font-size: 0.85rem;
    color: #86868b;
}
.product-card ul li { margin: 0.4rem 0; }
.product-card ul li::before {
    content: "✓ ";
    color: #34c759;
}
.articles {
    padding: 5rem 0;
    background: #f5f5f7;
}
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}
.section-link { color: #0066cc; font-size: 0.95rem; }
.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}
.article-card {
    background: #fff;
    border-radius: 18px;
    padding: 2rem;
    transition: all 0.35s ease;
    text-decoration: none;
    display: block;
}
.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.08);
    text-decoration: none;
}
.article-card:hover h3 { color: var(--apple-accent, #FF6600); }
.article-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #fff;
    background: var(--apple-accent, #FF6600);
    padding: 0.25rem 0.75rem;
    border-radius: 980px;
    margin-bottom: 1rem;
}
.article-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1d1d1f;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}
.article-card p {
    font-size: 0.9rem;
    color: #86868b;
    margin-bottom: 1rem;
    line-height: 1.5;
}
.article-card time { font-size: 0.8rem; color: #86868b; }
.cta {
    padding: 6rem 0;
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    margin: 0 -1.5rem;
}
.cta h2 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #fff;
}
.cta p {
    font-size: 1.15rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}
.brands {
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid #d2d2d7;
    border-bottom: 1px solid #d2d2d7;
    background: #f5f5f7;
}
.brands-label {
    font-size: 0.85rem;
    color: #86868b;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}
.brands-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2.5rem;
    font-size: 1.5rem;
    font-weight: 600;
}
.brand-link {
    color: #1d1d1f;
    opacity: 0.8;
    text-decoration: none;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 8px;
}
.brand-link:hover {
    opacity: 1;
    color: var(--apple-accent, #FF6600);
    background: rgba(255, 102, 0, 0.1);
    text-decoration: none;
}
.back-link {
    display: inline-block;
    margin: 2rem 0;
    color: #666;
    font-size: 0.95rem;
}
.back-link:hover { color: var(--apple-accent, #FF6600); }

@media (max-width: 768px) {
    .section-title { font-size: 2rem; }
    .product-grid, .article-grid { grid-template-columns: 1fr; }
    .brands-grid { gap: 1.5rem; font-size: 1.2rem; }
    .cta { padding: 4rem 1.5rem; }
    .cta h2 { font-size: 2rem; }
    nav { flex-wrap: wrap; gap: 0.5rem; padding: 0.6rem 1rem; }
    .nav-links { order: 3; width: 100%; justify-content: center; margin-top: 0.5rem; }
    .lang-switch { margin-left: 0; border-left: none; padding: 0.5rem 0; }
    .hero { padding: 4rem 0 3rem; }
    .hero-title { font-size: 2.25rem; }
    .hero-subtitle { font-size: 1.1rem; }
    .hero-cta { flex-direction: column; align-items: center; gap: 0.75rem; }
}

/* ==================== 响应式图片体系 ==================== */
@media (max-width: 768px) {
    .post {
        padding: 1.75rem 1.25rem;
        margin: 1rem auto;
        border-radius: 12px;
    }
    .post h1 { font-size: 1.65rem; }
    .post h2 { font-size: 1.35rem; }
    .img-hero,
    figure.img-hero { max-width: 100%; }
    .img-step,
    figure.img-step { max-width: 100%; }
    .img-detail,
    figure.img-detail { max-width: 300px; }
    .img-comparison { grid-template-columns: 1fr; gap: 1rem; }
    .layout-img-left,
    .layout-img-right { grid-template-columns: 1fr; gap: 1.25rem; }
    .img-gallery { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
    .img-gallery img { height: 160px; }
    .product-images { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
    .post { padding: 1.25rem 1rem; }
    .img-gallery { grid-template-columns: 1fr; }
    .product-images { grid-template-columns: 1fr; }
}