/* roulang page: index */
:root{
    --bg:#F4F2EC;
    --ink:#1F2422;
    --muted:#6D6C66;
    --line:#E2DDD1;
    --brand:#B4542A;
    --brand-deep:#91401F;
    --dark:#23201C;
    --dark-soft:#2E2A25;
  }
  html{scroll-behavior:smooth}
  body{
    font-family: system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
    background:var(--bg);
    color:var(--ink);
    line-height:1.7;
    text-rendering:optimizeLegibility;
    -webkit-font-smoothing:antialiased;
  }
  *{box-sizing:border-box}
  img{max-width:100%;display:block}
  a{color:inherit;text-decoration:none;transition:color .15s ease,background .15s ease,border-color .15s ease}
  .container-custom{max-width:1200px;margin-left:auto;margin-right:auto;padding-left:24px;padding-right:24px}
  .container-narrow{max-width:840px;margin-left:auto;margin-right:auto;padding-left:24px;padding-right:24px}

  .bg-hero{
    background-color:#23201C;
    background-image:linear-gradient(rgba(31,36,34,.88),rgba(35,32,28,.95)),url('/assets/images/backpic/back-1.webp');
    background-size:cover;background-position:center;
  }
  .hero-wipe-top{
    position:absolute;top:0;left:0;right:0;height:1px;
    background:linear-gradient(90deg,transparent,rgba(182,84,42,.7),transparent);
  }

  .glass-nav{
    background:rgba(244,242,236,.9);
    backdrop-filter:blur(18px);
    -webkit-backdrop-filter:blur(18px);
    border-bottom:1px solid var(--line);
  }
  .search-shell{
    background:#FFFDF8;
    border:1px solid var(--line);
    border-radius:999px;
    height:36px;
    width:180px;
    display:flex;align-items:center;
    padding:0 14px;
    gap:8px;
    transition:width .2s ease,border-color .2s ease;
  }
  .search-shell:focus-within{
    width:220px;
    border-color:var(--brand);
  }
  .search-shell input{
    background:transparent;border:0;outline:none;flex:1;
    font-size:13px;color:var(--ink);min-width:0;
  }
  .search-shell input::placeholder{
    color:#9A968C;
  }
  .kbd{
    border:1px solid #D8D2C6;border-radius:4px;font-size:11px;
    padding:0 5px;line-height:18px;white-space:nowrap;
    background:#F4F2EC;color:#6D6C66;
  }

  .btn-primary{
    display:inline-flex;align-items:center;justify-content:center;
    gap:8px;height:44px;padding:0 24px;
    background:var(--ink);color:#F8F3EA;
    border-radius:6px;
    font-weight:600;font-size:15px;
    border:1px solid var(--ink);
    transition:background .15s,transform .15s,box-shadow .15s;
    cursor:pointer;
  }
  .btn-primary:hover{
    background:#2B302D;
    transform:translateY(-1px);
  }
  .btn-primary:focus-visible{
    outline:2px solid var(--brand);outline-offset:2px;
  }
  .btn-brand{
    display:inline-flex;align-items:center;justify-content:center;
    gap:8px;height:44px;padding:0 24px;
    background:var(--brand);color:#FFF;
    border-radius:6px;
    font-weight:600;font-size:15px;
    border:1px solid var(--brand);
    transition:background .15s,transform .15s,box-shadow .15s;
    cursor:pointer;
  }
  .btn-brand:hover{
    background:var(--brand-deep);
    transform:translateY(-1px);
  }
  .btn-brand:focus-visible{
    outline:2px solid var(--brand-deep);outline-offset:2px;
  }
  .btn-outline{
    display:inline-flex;align-items:center;justify-content:center;
    gap:8px;height:44px;padding:0 24px;
    background:transparent;color:var(--ink);
    border:1px solid #C9C2B4;
    border-radius:6px;
    font-size:15px;font-weight:500;
    transition:background .15s,border-color .15s;
  }
  .btn-outline:hover{
    border-color:var(--ink);background:#FFFDF8;
  }
  .btn-outline:focus-visible{
    outline:2px solid var(--brand);outline-offset:2px;
  }
  .btn-white{
    display:inline-flex;align-items:center;justify-content:center;
    gap:8px;height:44px;padding:0 24px;
    background:#F1EADF;color:var(--dark);
    border-radius:6px;
    font-weight:600;font-size:15px;
    border:1px solid #F1EADF;
    transition:background .15s,transform .15s;
  }
  .btn-white:hover{
    background:#fff;transform:translateY(-1px);
  }

  .btn-download{
    height:56px;padding:0 32px;
    font-size:17px;border-radius:6px;
    display:inline-flex;align-items:center;justify-content:center;
    gap:10px;font-weight:600;
    background:#F1EADF;color:#23201C;
    border:1px solid #F1EADF;
    transition:transform .15s,background .15s,box-shadow .15s;
    cursor:pointer;
  }
  .btn-download:hover{
    background:#fff;
    transform:translateY(-2px);
    box-shadow:0 12px 30px -12px rgba(0,0,0,.5);
  }
  .btn-download-dark{
    height:56px;padding:0 32px;
    font-size:17px;border-radius:6px;
    display:inline-flex;align-items:center;justify-content:center;
    gap:10px;font-weight:600;
    background:var(--brand);color:#fff;
    border:1px solid var(--brand);
    transition:background .15s,transform .15s,box-shadow .15s;
    cursor:pointer;
  }
  .btn-download-dark:hover{
    background:var(--brand-deep);
    transform:translateY(-2px);
  }

  .section-tag{
    display:inline-block;
    font-size:12px;font-weight:600;letter-spacing:.14em;
    color:var(--brand);
    text-transform:uppercase;
    margin-bottom:14px;
  }
  .section-title{
    font-size:34px;line-height:1.25;font-weight:650;
    color:var(--ink);
    letter-spacing:-.01em;
  }
  @media(max-width:768px){
    .section-title{font-size:28px}
  }

  .card-soft{
    background:#FFFDF8;
    border:1px solid var(--line);
    border-radius:10px;
    box-shadow:0 12px 40px -22px rgba(31,36,34,.12);
  }

  .nav-link{
    font-size:15px;color:#544F46;position:relative;
    padding:8px 2px;white-space:nowrap;
    letter-spacing:.01em;
  }
  .nav-link:hover{color:var(--ink)}
  .nav-link.active{color:var(--ink);font-weight:600}
  .nav-link.active::after{
    content:'';position:absolute;left:0;right:0;bottom:-6px;height:2px;
    background:var(--brand);border-radius:2px;
  }

  .line-v{width:1px;background:var(--line)}

  .info-item{
    border-left:2px solid var(--brand);
    background:#FFFDF8;
    border-radius:0 8px 8px 0;
    padding:16px 18px;
    transition:transform .15s,box-shadow .15s,background .15s;
  }
  .info-item:hover{
    transform:translateX(3px);
    box-shadow:0 10px 24px -14px rgba(31,36,34,.14);
    background:#fff;
  }

  .table-env{
    width:100%;border-collapse:collapse;
  }
  .table-env th{
    text-align:left;font-size:14px;font-weight:500;color:#B7AFA3;
    text-transform:uppercase;letter-spacing:.1em;
    padding:12px 16px;
    border-bottom:1px solid #F1EADF;
  }
  .table-env td{
    padding:14px 16px;
    border-bottom:1px solid rgba(241,234,223,.12);
    color:#F1EADF;font-size:15px;
    vertical-align:top;
  }
  .table-env tr:last-child td{border-bottom:0}

  .avatar-square{
    width:40px;height:40px;border-radius:8px;
    display:flex;align-items:center;justify-content:center;
    font-size:16px;font-weight:600;color:#fff;
    background:var(--ink);
  }

  .faq-btn{
    width:100%;text-align:left;
    display:flex;align-items:center;gap:16px;
    padding:22px 16px;
    background:transparent;
    border:0;
    border-bottom:1px solid var(--line);
    cursor:pointer;
    font-family:inherit;
  }
  .faq-btn:hover .faq-title{color:var(--brand)}
  .faq-btn:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
  .faq-item:last-child .faq-btn{border-bottom:0}
  .faq-num{
    font-size:13px;font-weight:600;color:var(--brand);
    min-width:30px;text-align:right;
  }
  .faq-title{
    flex:1;font-size:17px;font-weight:600;color:var(--ink);
    transition:color .15s;
  }
  .faq-icon{
    width:20px;height:20px;position:relative;flex-shrink:0;
  }
  .faq-icon::before,.faq-icon::after{
    content:'';position:absolute;background:var(--muted);
    transition:opacity .2s ease,transform .2s ease;
  }
  .faq-icon::before{width:10px;height:2px;top:9px;left:5px}
  .faq-icon::after{width:2px;height:10px;top:5px;left:9px}
  .faq-panel{
    max-height:0;overflow:hidden;
    transition:max-height .3s ease;
  }
  .faq-inner{
    padding:0 16px 22px 62px;
    font-size:15px;color:var(--muted);
    line-height:1.8;
  }
  .faq-open .faq-icon::after{opacity:0;transform:scaleY(0)}
  .faq-open .faq-icon::before{opacity:1;transform:scaleX(1)}

  .footer-link{
    color:#B7AFA3;font-size:14px;line-height:1.9;
    transition:color .15s;
  }
  .footer-link:hover{color:#F1EADF}

  .backtop-btn{
    display:inline-flex;align-items:center;gap:6px;
    color:#F1EADF;font-size:14px;
    transition:color .15s;
  }
  .backtop-btn:hover{color:#D69A4E}

  .cover-shadow{
    box-shadow:0 24px 80px -32px rgba(31,36,34,.5);
  }

  .quote-seri{
    font-family:"Songti SC","Noto Serif CJK SC",serif;
  }

  @media(max-width:1024px){
    .nav-menu{display:none}
    .mobile-menu-btn{display:inline-flex}
  }
  @media(min-width:1025px){
    .mobile-menu-btn{display:none}
  }
  @media(max-width:768px){
    .search-shell{display:none}
    .header-cta{display:none}
  }
  .mobile-drawer{
    position:fixed;inset:0;z-index:90;
    background:rgba(35,32,28,.4);
    display:none;
  }
  .mobile-drawer-panel{
    background:var(--bg);
    width:88%;max-width:320px;
    height:100vh;margin-left:auto;
    padding:28px 24px;
    overflow-y:auto;
  }
  .mobile-drawer.open{display:block}
  .drawer-link{
    display:block;font-size:17px;font-weight:500;
    color:var(--ink);padding:14px 4px;
    border-bottom:1px solid var(--line);
  }
  .drawer-link:hover{color:var(--brand)}
  .drawer-link .dot{color:var(--brand);margin-right:6px}

  @media(prefers-reduced-motion:reduce){
    *{animation:none!important;transition:none!important}
    html{scroll-behavior:auto}
  }

  .img-card{
    width:100%;height:auto;object-fit:cover;
    border-radius:8px;
  }
  .g-img{
    filter:grayscale(20%);
    transition:filter .25s ease,transform .25s ease;
  }
  .img-zoom-wrap{overflow:hidden;border-radius:8px}
  .img-zoom-wrap img{transition:transform .3s ease,filter .3s ease;filter:grayscale(30%)}
  .img-zoom-wrap:hover img{transform:scale(1.02);filter:grayscale(0%)}

  .strip-arrow::before{color:var(--brand);content:"↳";margin-right:6px;font-weight:500}

/* roulang page: article */
/* ========== 设计变量 ========== */
    :root {
        --bg: #F4F2EC;
        --cream: #FFFDF8;
        --ink: #1F2422;
        --muted: #6D6C66;
        --line: #E2DDD1;
        --brand: #B4542A;
        --brand-deep: #91401F;
        --amber: #D69A4E;
        --dark: #23201C;
        --dark-soft: #2E2A25;
        --dark-text: #F1EADF;
        --dark-muted: #B7AFA3;
        --radius-sm: 6px;
        --radius-md: 10px;
        --shadow-card: 0 12px 40px -24px rgba(31, 36, 34, .18);
        --shadow-lift: 0 18px 50px -28px rgba(31, 36, 34, .24);
    }

    *,
    *::before,
    *::after {
        box-sizing: border-box;
    }

    html {
        scroll-behavior: smooth;
    }

    body {
        margin: 0;
        background: var(--bg);
        color: var(--ink);
        font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
        line-height: 1.7;
        -webkit-font-smoothing: antialiased;
        text-rendering: optimizeLegibility;
    }

    img {
        max-width: 100%;
        height: auto;
        display: block;
    }

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

    button,
    input {
        font-family: inherit;
    }

    ::selection {
        background: rgba(180, 84, 42, .18);
    }

    .container-custom {
        max-width: 1280px;
        margin-inline: auto;
        padding-inline: 24px;
    }

    /* ========== 导航栏 ========== */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 60;
        height: 72px;
        background: rgba(244, 242, 236, .86);
        -webkit-backdrop-filter: blur(18px);
        backdrop-filter: blur(18px);
        border-bottom: 1px solid rgba(226, 221, 209, .76);
        transition: background .24s ease, box-shadow .24s ease;
    }

    .site-header.is-scrolled {
        background: rgba(250, 248, 242, .93);
        box-shadow: 0 10px 40px -25px rgba(31, 36, 34, .2);
    }

    .brand-block {
        display: flex;
        align-items: center;
        gap: 0.6rem;
        min-width: 0;
    }

    .brand-mark {
        font-size: 25px;
        font-weight: 700;
        color: var(--brand);
        line-height: 1;
        transform: translateY(-1px);
    }

    .brand-main {
        font-size: 18px;
        font-weight: 700;
        letter-spacing: -0.01em;
        line-height: 1.2;
        color: var(--ink);
        white-space: nowrap;
    }

    .brand-sub {
        font-size: 9px;
        letter-spacing: .24em;
        text-transform: uppercase;
        color: var(--muted);
        margin-top: 2px;
        white-space: nowrap;
    }

    .nav-menu {
        display: flex;
        align-items: center;
        gap: 30px;
        margin-left: 40px;
    }

    .nav-link {
        position: relative;
        font-size: 15px;
        color: var(--muted);
        padding: 8px 2px;
        transition: color .2s ease;
        white-space: nowrap;
    }

    .nav-link:hover {
        color: var(--ink);
    }

    .nav-link::after {
        content: "";
        position: absolute;
        left: 0;
        bottom: -2px;
        height: 2px;
        width: 0;
        background: var(--brand);
        transition: width .24s ease;
        border-radius: 2px;
    }

    .nav-link.active {
        color: var(--ink);
        font-weight: 600;
    }

    .nav-link.active::after,
    .nav-link:hover::after {
        width: 24px;
    }

    .header-search-trigger {
        display: flex;
        align-items: center;
        gap: 8px;
        background: #EDE9DF;
        border: 1px solid var(--line);
        border-radius: 8px;
        height: 36px;
        padding: 0 10px 0 12px;
        font-size: 13px;
        color: var(--muted);
        cursor: pointer;
        transition: all .18s ease;
        width: 180px;
    }

    .header-search-trigger:hover {
        border-color: #CFC6B6;
        background: #E7E2D7;
        width: 200px;
    }

    .header-search-trigger kbd {
        border: 1px solid rgba(109, 108, 102, .35);
        border-radius: 4px;
        padding: 1px 6px;
        font-size: 10px;
        line-height: 1.4;
        color: #8d8a81;
    }

    .btn {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        justify-content: center;
        height: 44px;
        padding: 0 26px;
        border-radius: 8px;
        font-weight: 600;
        font-size: 15px;
        transition: background .15s ease, color .15s ease, transform .15s ease, border-color .15s ease, box-shadow .15s ease;
        cursor: pointer;
        border: 1px solid transparent;
        white-space: nowrap;
    }

    .btn-brand {
        background: var(--brand);
        color: #fff;
        box-shadow: 0 8px 22px -12px rgba(180, 84, 42, .8);
    }

    .btn-brand:hover {
        background: var(--brand-deep);
        transform: translateY(-1px);
    }

    .btn-dark {
        background: var(--ink);
        color: var(--dark-text);
    }

    .btn-dark:hover {
        background: #323a35;
        transform: translateY(-1px);
    }

    .btn-light {
        background: var(--cream);
        color: var(--ink);
        border: 1px solid #d9d2c2;
    }

    .btn-light:hover {
        background: #fff;
        border-color: #9b9384;
    }

    .btn:focus-visible,
    .header-search-trigger:focus-visible,
    .nav-link:focus-visible,
    .footer-link:focus-visible {
        outline: 2px solid var(--brand);
        outline-offset: 2px;
    }

    .btn-lg {
        height: 52px;
        padding: 0 34px;
        font-size: 16px;
        border-radius: 10px;
    }

    /* ========== 移动导航 ========== */
    .mobile-nav {
        position: fixed;
        inset: 0;
        background: rgba(244, 242, 236, .98);
        z-index: 90;
        display: flex;
        flex-direction: column;
        padding: 105px 30px 40px;
        opacity: 0;
        visibility: hidden;
        transition: opacity .22s ease, visibility .22s ease;
    }

    .mobile-nav.is-open {
        opacity: 1;
        visibility: visible;
    }

    .mobile-nav .mobile-item {
        font-size: 26px;
        font-weight: 600;
        padding: 14px 0;
        border-bottom: 1px solid var(--line);
        color: var(--ink);
        display: flex;
        align-items: center;
        gap: 18px;
    }

    .mobile-nav .mobile-item.active {
        color: var(--brand);
    }

    .mobile-nav .mobile-item span {
        width: 36px;
        height: 36px;
        border-radius: 6px;
        background: var(--dark);
        color: #fff;
        font-size: 13px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        flex: none;
    }

    .mobile-nav-close {
        position: absolute;
        top: 18px;
        right: 20px;
        width: 46px;
        height: 46px;
        border-radius: 50%;
        background: transparent;
        border: none;
        color: var(--ink);
        font-size: 26px;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .mobile-nav-close:hover {
        background: rgba(31, 36, 34, .06);
    }

    /* ========== 文章正文排版 ========== */
    .article-hero {
        padding: 54px 0 0;
    }

    .article-kicker {
        display: inline-flex;
        align-items: center;
        gap: 12px;
        font-size: 13px;
        font-weight: 600;
        letter-spacing: .06em;
        color: var(--brand);
        margin-bottom: 24px;
    }

    .article-kicker .dot {
        width: 6px;
        height: 6px;
        border-radius: 50%;
        background: var(--brand);
    }

    .article-kicker .crumb-line {
        display: flex;
        align-items: center;
        gap: 8px;
        color: var(--muted);
        font-weight: 400;
        font-size: 14px;
    }

    .breadcrumb {
        padding-bottom: 26px;
        border-bottom: 1px solid var(--line);
    }

    .breadcrumb li {
        display: inline-flex;
        align-items: center;
        gap: 8px;
    }

    .breadcrumb a {
        color: var(--muted);
        font-size: 14px;
        transition: color .15s;
    }

    .breadcrumb a:hover {
        color: var(--brand);
    }

    .breadcrumb .sep {
        color: #b1aaa0;
        margin: 0 2px;
    }

    .article-title {
        font-size: 44px;
        line-height: 1.18;
        font-weight: 700;
        letter-spacing: -0.03em;
        margin: 0 0 20px;
        color: var(--ink);
        max-width: 760px;
    }

    .article-meta-row {
        display: flex;
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 16px;
        padding-top: 22px;
        border-top: 1px solid var(--line);
    }

    .article-meta-item {
        display: flex;
        align-items: center;
        gap: 18px;
        font-size: 14px;
        color: var(--muted);
        flex-wrap: wrap;
    }

    .article-meta-item strong {
        color: var(--ink);
        font-weight: 600;
    }

    .article-cat-chip {
        background: rgba(180, 84, 42, .08);
        color: var(--brand);
        font-size: 12px;
        font-weight: 600;
        border-radius: 999px;
        padding: 4px 13px;
        display: inline-flex;
        align-items: center;
        gap: 6px;
    }

    .article-reading {
        background: transparent;
        padding-bottom: 30px;
    }

    .article-inner {
        max-width: 860px;
        margin: 0 auto;
        padding-top: 70px;
    }

    .post-body {
        font-size: 18px;
        line-height: 2;
        color: #2B2F2B;
    }

    .post-body p {
        margin: 0 0 1.7em;
        line-height: 1.95;
    }

    .post-body h2 {
        font-size: 28px;
        line-height: 1.3;
        font-weight: 700;
        margin: 2em 0 .8em;
        letter-spacing: -0.02em;
    }

    .post-body h3 {
        font-size: 21px;
        line-height: 1.4;
        font-weight: 700;
        margin: 1.8em 0 .7em;
    }

    .post-body a {
        color: var(--brand);
        text-decoration: underline;
        text-underline-offset: 4px;
        text-decoration-color: rgba(180, 84, 42, .36);
        transition: text-decoration-color .15s;
    }

    .post-body a:hover {
        text-decoration-color: var(--brand);
    }

    .post-body ul,
    .post-body ol {
        margin: 0 0 1.7em padding-left: 1.6em;
    }

    .post-body li {
        margin-bottom: .65em;
        line-height: 1.9;
    }

    .post-body ul li::marker {
        color: var(--brand);
    }

    .post-body blockquote {
        margin: 2em 0;
        border-left: 3px solid var(--brand);
        background: rgba(255, 253, 248, .7);
        padding: 22px 28px;
        border-radius: 0 var(--radius-md) var(--radius-md) 0;
        color: var(--muted);
        font-size: 17px;
    }

    .post-body blockquote p {
        margin: 0;
    }

    .post-body img {
        border-radius: 12px;
        margin: 2em 0;
        border: 1px solid var(--line);
    }

    .post-body code {
        background: #EDE8DF;
        font-size: .9em;
        padding: 3px 8px;
        border-radius: 6px;
    }

    .post-body pre {
        background: var(--dark);
        color: var(--dark-text);
        border-radius: 12px;
        padding: 24px 26px;
        overflow-x: auto;
        margin: 2em 0;
        line-height: 1.8;
        font-size: 15px;
    }

    .post-body pre code {
        background: transparent;
        padding: 0;
        color: inherit;
    }

    .post-body table {
        width: 100%;
        border-collapse: collapse;
        margin: 2em 0;
        font-size: 15px;
        line-height: 1.7;
        background: var(--cream);
        border-radius: 12px;
        overflow: hidden;
        border: 1px solid var(--line);
    }

    .post-body th {
        background: rgba(31, 36, 34, .06);
        text-align: left;
        font-weight: 700;
        padding: 14px 18px;
    }

    .post-body td {
        padding: 14px 18px;
        border-top: 1px solid var(--line);
        vertical-align: top;
    }

    /* ========== 文章页卡片 / 空态 ========== */
    .paper-card {
        background: var(--cream);
        border: 1px solid var(--line);
        border-radius: 14px;
        box-shadow: var(--shadow-card);
    }

    .more-card {
        transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
        border: 1px solid var(--line);
        background: var(--cream);
        border-radius: 14px;
        box-shadow: var(--shadow-card);
        display: block;
    }

    .more-card:hover {
        transform: translateY(-4px);
        border-color: #C7B398;
        box-shadow: var(--shadow-lift);
    }

    .empty-state {
        border: 1px dashed #CFC7B8;
        background: rgba(255, 253, 248, .5);
        border-radius: 14px;
    }

    .geo-avatar {
        width: 42px;
        height: 42px;
        border-radius: 11px;
        flex: none;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 700;
        font-size: 15px;
        color: #fff;
    }

    .geo-avatar.avatar-a {
        background: linear-gradient(135deg, #B4542A, #7F3A20);
    }

    .geo-avatar.avatar-b {
        background: linear-gradient(135deg, #2E4842, #47665D);
    }

    .geo-avatar.avatar-c {
        background: linear-gradient(135deg, #5B5A3A, #8A8855);
    }

    .geo-avatar.avatar-d {
        background: linear-gradient(135deg, #6B6044, #A19672);
    }

    /* ========== 页脚 ========== */
    .footer-link {
        font-size: 14px;
        color: #B7AFA3;
        padding: 4px 0;
        transition: color .15s ease;
    }

    .footer-link:hover {
        color: #F1EADF;
    }

    .footer-link::before {
        content: "· ";
        color: var(--brand);
    }

    .backtop-btn {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        background: rgba(255, 255, 255, .06);
        color: #F1EADF;
        border: 1px solid rgba(255, 255, 255, .14);
        border-radius: 8px;
        font-size: 14px;
        padding: 9px 18px;
        transition: background .15s, transform .15s;
    }

    .backtop-btn:hover {
        background: rgba(255, 255, 255, .12);
        transform: translateY(-2px);
    }

    .author-mini-card {
        background: var(--cream);
        border: 1px solid var(--line);
        border-radius: 16px;
        padding: 20px 24px;
        display: flex;
        align-items: center;
        gap: 18px;
    }

    .share-actions a,
    .share-actions button {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        border: 1px solid var(--line);
        background: var(--cream);
        border-radius: 8px;
        height: 36px;
        padding: 0 14px;
        font-size: 13px;
        color: var(--ink);
        cursor: pointer;
        transition: all .15s;
    }

    .share-actions a:hover,
    .share-actions button:hover {
        border-color: var(--brand);
        color: var(--brand);
    }

    .pager-placeholder {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        border-radius: 12px;
        padding: 14px 4px;
        color: var(--muted);
        font-size: 14px;
    }

    /* ========== 搜索浮层 ========== */
    .search-sheet {
        position: fixed;
        z-index: 120;
        left: 0;
        right: 0;
        top: 0;
        bottom: 0;
        background: rgba(31, 36, 34, .4);
        opacity: 0;
        visibility: hidden;
        transition: opacity .18s ease, visibility .18s;
        display: flex;
        align-items: flex-start;
        justify-content: center;
        padding-top: 110px;
    }

    .search-sheet.is-open {
        opacity: 1;
        visibility: visible;
    }

    .search-pop {
        width: min(560px, 92vw);
        background: #FFFDF8;
        border-radius: 14px;
        box-shadow: 0 30px 90px -24px rgba(0, 0, 0, .3);
        overflow: hidden;
        transform: translateY(14px);
        transition: transform .2s ease;
    }

    .search-sheet.is-open .search-pop {
        transform: translateY(0);
    }

    .search-pop input {
        width: 100%;
        border: 0;
        background: transparent;
        padding: 18px 20px;
        font-size: 17px;
        outline: none;
        border-bottom: 1px solid var(--line);
    }

    /* ========== 信息区通用 ========== */
    .section-label {
        font-size: 14px;
        font-weight: 700;
        color: var(--brand);
        letter-spacing: .08em;
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .section-label::after {
        content: "";
        width: 34px;
        height: 1px;
        background: rgba(180, 84, 42, .42);
    }

    /* ========== 动效偏好 ========== */
    @media (prefers-reduced-motion: reduce) {
        *,
        *::before,
        *::after {
            transition: none !important;
            animation: none !important;
            scroll-behavior: auto !important;
        }
    }

    /* ========== 响应式 ========== */
    @media (max-width: 1024px) {
        .desktop-nav-main {
            display: none;
        }

        .search-trigger-wrap {
            display: none;
        }
    }

    @media (max-width: 767px) {
        .site-header {
            height: 64px;
        }

        .article-title {
            font-size: 28px;
            line-height: 1.3;
        }

        .article-inner {
            padding-top: 50px;
        }

        .post-body {
            font-size: 16.5px;
            line-height: 1.85;
        }

        .post-body h2 {
            font-size: 23px;
        }

        .brand-sub {
            display: none;
        }
    }

    @media (max-width: 520px) {
        .container-custom {
            padding-inline: 18px;
        }

        .header-burger {
            display: flex !important;
        }

        .header-cta-desktop {
            display: none;
        }
    }

/* roulang page: category1 */
:root {
    --bg: #F4F2EC;
    --ink: #1F2422;
    --muted: #6D6C66;
    --line: #E2DDD1;
    --brand: #B4542A;
    --brand-deep: #91401F;
    --amber-accent: #D69A4E;
    --dark: #23201C;
    --dark-soft: #2E2A25;
    --deep-text: #F1EADF;
    --deep-muted: #B7AFA3;
    --card-bg: #FFFDF8;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-soft: 0 12px 40px -22px rgba(31, 36, 34, 0.16);
    --shadow-lifted: 0 18px 44px -24px rgba(31, 36, 34, 0.22);
    --font-serif: "Songti SC", "Noto Serif CJK SC", serif;
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    background: var(--bg);
    color: var(--ink);
    font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
    font-size: 16px;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
  }

  p,
  h1,
  h2,
  h3,
  h4,
  figure,
  blockquote {
    margin: 0;
  }

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

  img,
  svg {
    display: block;
    max-width: 100%;
  }

  button,
  input {
    font: inherit;
    color: inherit;
  }

  ::selection {
    background: rgba(180, 84, 42, 0.16);
    color: var(--ink);
  }

  .container-custom {
    width: min(1200px, 100% - 48px);
    margin-inline: auto;
  }

  .container-narrow {
    width: min(920px, 100% - 48px);
    margin-inline: auto;
  }

  .site-header {
    position: sticky;
    top: 0;
    z-index: 60;
    background: rgba(244, 242, 236, 0.92);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(226, 221, 209, 0.9);
    transition: background 0.2s ease;
  }

  .site-header.scrolled {
    background: rgba(244, 242, 236, 0.98);
  }

  .nav-menu {
    display: none;
    align-items: center;
    gap: clamp(16px, 2vw, 28px);
  }

  .nav-menu a {
    font-size: 15px;
    font-weight: 500;
    color: #55514B;
    position: relative;
    padding: 6px 0 4px;
    letter-spacing: 0.01em;
    transition: color 0.18s ease;
  }

  .nav-menu a:hover {
    color: var(--ink);
    transform: translateY(1px);
  }

  .nav-menu a.active {
    color: var(--ink);
    font-weight: 600;
  }

  .nav-menu a.active::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    background: var(--brand);
    border-radius: 2px;
  }

  .command-search {
    display: none;
    width: 188px;
    transition: width 0.25s ease;
  }

  .command-search:focus-within {
    width: 224px;
  }

  .command-search form {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 253, 248, 0.8);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 6px 10px;
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
  }

  .command-search form:focus-within {
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(180, 84, 42, 0.12);
  }

  .command-search input {
    min-width: 0;
    flex: 1;
    background: transparent;
    border: 0;
    outline: 0;
    font-size: 14px;
    color: var(--ink);
  }

  .command-search input::placeholder {
    color: #969084;
  }

  .command-search svg {
    flex-shrink: 0;
  }

  .btn-primary,
  .btn-outline,
  .btn-ghost-light,
  .btn-white-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 44px;
    padding: 0 22px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    line-height: 1;
    transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
    white-space: nowrap;
  }

  .btn-primary {
    background: var(--brand);
    color: #fff;
    border: 1px solid var(--brand);
  }

  .btn-primary:hover {
    background: var(--brand-deep);
    border-color: var(--brand-deep);
    transform: translateY(-1px);
    box-shadow: 0 10px 22px -12px rgba(180, 84, 42, 0.7);
  }

  .btn-primary:focus-visible {
    outline: 2px solid var(--brand-deep);
    outline-offset: 2px;
    box-shadow: 0 0 0 6px rgba(180, 84, 42, 0.18);
  }

  .btn-outline {
    background: #fff;
    border: 1px solid var(--ink);
    color: var(--ink);
  }

  .btn-outline:hover {
    background: var(--ink);
    color: #fff;
    transform: translateY(-1px);
  }

  .btn-outline:focus-visible {
    outline: 2px solid #6f1e0b;
    outline-offset: 2px;
    box-shadow: 0 0 0 6px rgba(180, 84, 42, 0.14);
  }

  .btn-ghost-light {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(241, 234, 223, 0.38);
    color: var(--deep-text);
  }

  .btn-ghost-light:hover {
    background: #fff;
    border-color: #fff;
    color: var(--dark);
    transform: translateY(-1px);
  }

  .btn-white-outline {
    background: transparent;
    border: 1px solid rgba(241, 234, 223, 0.36);
    color: var(--deep-text);
  }

  .btn-white-outline:hover {
    background: rgba(241, 234, 223, 0.14);
    border-color: rgba(241, 234, 223, 0.7);
  }

  .mobile-panel {
    display: none;
    padding: 18px 0 28px;
    background: rgba(255, 253, 248, 0.97);
    border-bottom: 1px solid var(--line);
  }

  .mobile-panel.is-open {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .mobile-panel a {
    padding: 12px 8px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    color: var(--ink);
  }

  .mobile-panel a.active {
    background: rgba(180, 84, 42, 0.1);
    color: var(--brand-deep);
  }

  .logo-mark {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.2;
  }

  .logo-main {
    font-size: 18px;
    font-weight: 700;
    color: var(--ink);
    letter-spacing: -0.01em;
  }

  .logo-sub {
    font-size: 10px;
    letter-spacing: .18em;
    color: #969084;
    text-transform: uppercase;
    margin-top: 2px;
  }

  .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--brand-deep);
  }

  .eyebrow::before {
    content: "";
    width: 20px;
    height: 1px;
    background: var(--brand);
  }

  .section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
  }

  .content-card {
    background: var(--card-bg);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-soft);
  }

  .index-mark {
    font-family: var(--font-serif);
    font-weight: 700;
    color: var(--brand);
    font-size: 14px;
  }

  .check-list {
    list-style: none;
    display: grid;
    gap: 18px;
  }

  .check-list li {
    position: relative;
    padding-left: 34px;
    font-size: 15px;
    line-height: 1.75;
    color: #4e4a45;
  }

  .check-list li strong {
    color: var(--ink);
    font-weight: 600;
  }

  .check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 5px;
    width: 20px;
    height: 20px;
    border: 1px solid var(--brand);
    border-radius: 50%;
    background: rgba(180, 84, 42, 0.08);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 20 20' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M5.5 10.5L8.6 13.7L14.5 7' stroke='%2391401F' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-size: 12px;
    background-position: center;
    background-repeat: no-repeat;
  }

  .footer-link {
    font-size: 14px;
    color: #B7AFA3;
    line-height: 2.2;
    transition: color 0.15s ease;
  }

  .footer-link:hover {
    color: #fff;
  }

  .backtop-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: #8F8778;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding-bottom: 4px;
    transition: color 0.2s ease, border-color 0.2s ease;
  }

  .backtop-btn:hover {
    color: #fff;
    border-color: #fff;
  }

  details.faq-item {
    border-bottom: 1px solid var(--line);
    list-style-type: none;
  }

  details.faq-item summary {
    list-style-type: none;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px 4px;
    cursor: pointer;
    transition: background 0.2s ease;
  }

  details.faq-item summary:focus-visible {
    outline: 2px solid var(--brand);
    outline-offset: 4px;
    border-radius: 8px;
  }

  details.faq-item summary::-webkit-details-marker {
    display: none;
  }

  .faq-no {
    font-size: 13px;
    font-weight: 700;
    color: var(--brand-deep);
    letter-spacing: .06em;
    font-family: var(--font-serif);
    min-width: 30px;
  }

  .faq-title {
    font-size: 17px;
    font-weight: 600;
    flex: 1;
  }

  .faq-icon {
    position: relative;
    width: 22px;
    height: 22px;
    border: 1px solid #BFB9AE;
    border-radius: 50%;
    flex-shrink: 0;
    transition: border-color 0.2s, background 0.2s;
  }

  .faq-icon::before,
  .faq-icon::after {
    content: "";
    position: absolute;
    background: #888078;
    left: 50%;
    top: 50%;
    translate: -50% -50%;
    transition: background 0.2s, opacity 0.2s;
  }

  .faq-icon::before {
    width: 9px;
    height: 1.5px;
  }

  .faq-icon::after {
    height: 9px;
    width: 1.5px;
  }

  details.faq-item[open] .faq-icon {
    background: var(--brand);
    border-color: var(--brand);
  }

  details.faq-item[open] .faq-icon::before,
  details.faq-item[open] .faq-icon::after {
    background: #fff;
  }

  details.faq-item[open] .faq-icon::after {
    opacity: 0;
  }

  details.faq-item .faq-body {
    padding: 0 48px 28px;
    padding-left: 50px;
    font-size: 15.5px;
    line-height: 1.9;
    color: #68655f;
    max-width: 900px;
  }

  .pseudo-window {
    background: rgba(255, 253, 248, 0.96);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-lg);
    box-shadow: 0 24px 64px -30px rgba(0, 0, 0, 0.5);
  }

  .pseudo-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.45);
  }

  .dark-block {
    background-color: var(--dark);
    color: var(--deep-text);
  }

  @media (min-width: 1024px) {
    .nav-menu {
      display: flex;
    }

    .command-search {
      display: block;
    }

    .menu-toggle,
    .menu-close {
      display: none !important;
    }

    .desktop-cta {
      display: inline-flex !important;
    }
  }

  @media (max-width: 1023px) {
    .desktop-cta {
      display: none !important;
    }
  }

  @media (max-width: 640px) {
    .container-custom {
      width: min(1200px, 100% - 36px);
    }

    .faq-title {
      font-size: 16px;
    }

    details.faq-item .faq-body {
      padding-left: 46px;
      padding-right: 8px;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      transition-duration: 0.01ms !important;
      scroll-behavior: auto !important;
    }
  }

/* roulang page: category2 */
:root{
  --bg:#F4F2EC;
  --paper:#FFFDF8;
  --ink:#1F2422;
  --muted:#6D6C66;
  --line:#E2DDD1;
  --brand:#B4542A;
  --brand-deep:#91401F;
  --amber:#D69A4E;
  --dark:#23201C;
  --dark-soft:#2E2A25;
  --cream:#FAF7F0;
  --text-on-dark:#F1EADF;
  --muted-dark:#B7AFA3;
  --radius-card:10px;
  --shadow-card:0 12px 40px -22px rgba(31,36,34,.18);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button,input{font:inherit;color:inherit}
h1,h2,h3,h4,p{margin-top:0}
.container-custom{width:100%;max-width:1200px;margin-left:auto;margin-right:auto;padding-left:24px;padding-right:24px}
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(244,242,236,.86);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s ease;
}
.site-header.scrolled{box-shadow:0 8px 30px -18px rgba(31,36,34,.28)}
.header-inner{display:flex;align-items:center;height:72px;gap:24px}
.brand-logo{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand-mark{
  width:34px;height:34px;border-radius:8px;
  background:var(--ink);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:17px;letter-spacing:.04em;
}
.brand-name{font-size:18px;font-weight:700;letter-spacing:-.02em;white-space:nowrap}
.brand-year{font-size:11px;color:var(--muted);letter-spacing:.14em;display:block;margin-left:auto;font-weight:500}
.main-nav{display:flex;align-items:center;gap:clamp(14px,2.2vw,38px);margin:0 auto}
.nav-link{position:relative;font-size:15px;color:#3D433F;font-weight:500;padding:8px 1px;transition:color .15s ease}
.nav-link:hover{color:var(--ink)}
.nav-link.active{color:var(--ink);font-weight:600}
.nav-link.active::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;
  background:var(--brand);border-radius:2px;
}
.nav-tools{display:flex;align-items:center;gap:14px;flex-shrink:0}
.cmd-search{
  display:flex;align-items:center;gap:8px;
  height:38px;padding:0 8px 0 12px;
  background:var(--paper);border:1px solid var(--line);border-radius:8px;
  color:var(--muted);min-width:150px;cursor:pointer;transition:border .15s ease,box-shadow .15s ease;
}
.cmd-search:hover{border-color:#c4bbac;color:var(--ink)}
.cmd-search:focus-visible{outline:2px solid #8f4020;outline-offset:2px}
.cmd-search kbd{
  margin-left:auto;background:var(--bg);border:1px solid var(--line);border-radius:5px;
  padding:1px 6px;font-size:11px;font-family:inherit;color:var(--muted);
}
.nav-burger{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:8px;background:var(--paper);align-items:center;justify-content:center;gap:4px;flex-direction:column;cursor:pointer}
.nav-burger span{display:block;width:17px;height:2px;background:var(--ink);border-radius:2px}
.mobile-menu{
  display:none;border-top:1px solid var(--line);background:var(--bg);
  padding:14px 24px 22px;position:fixed;left:0;right:0;top:72px;z-index:55;
  box-shadow:0 16px 30px -18px rgba(31,36,34,.16);
}
.mobile-menu.open{display:block}
.mobile-menu .nav-link{display:block;padding:12px 0;border-bottom:1px solid var(--line)}
.mobile-menu .nav-link:last-child{border-bottom:none}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:7px;font-size:15px;font-weight:600;
  border:1px solid transparent;white-space:nowrap;cursor:pointer;
  transition:transform .15s ease,background .15s ease,box-shadow .15s ease,border-color .15s ease,color .15s ease;
}
.btn:focus-visible{outline:2px solid var(--brand);outline-offset:3px}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-deep);transform:translateY(-1px);box-shadow:0 8px 20px -10px rgba(145,64,31,.5)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost-light{
  background:rgba(255,255,255,.06);border-color:rgba(241,234,223,.34);color:var(--text-on-dark);
}
.btn-ghost-light:hover{background:var(--dark-soft);border-color:var(--text-on-dark);color:#fff}
.btn-ink{background:var(--ink);color:#fff}
.btn-ink:hover{background:#111411;transform:translateY(-1px);box-shadow:0 10px 22px -12px rgba(31,36,34,.45)}
.btn-block-xl{height:56px;padding:0 30px;font-size:16px;border-radius:9px}
.section{padding:88px 0}
.section.paper{background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;font-size:13px;font-weight:700;
  color:var(--brand);letter-spacing:.06em;margin-bottom:18px;
}
.eyebrow::before{content:"";width:24px;height:2px;background:var(--amber)}
.section-title{font-size:clamp(30px,4vw,44px);font-weight:700;line-height:1.2;letter-spacing:-.03em;margin-bottom:12px}
.lead-text{font-size:17px;line-height:1.9;color:var(--muted);max-width:760px}
.card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-card);
  box-shadow:var(--shadow-card);
}
.paper-card{background:var(--paper);border-radius:10px;border:1px solid var(--line)}
.page-hero{
  position:relative;background:var(--dark);color:var(--text-on-dark);
  overflow:hidden;
}
.hero-artwork{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.28}
.hero-shadow{position:absolute;inset:0;background:linear-gradient(100deg, rgba(35,32,28,.96) 0%, rgba(35,32,28,.8) 38%, rgba(35,32,28,.46) 100%)}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--muted-dark);margin-bottom:22px}
.breadcrumb a{color:var(--muted-dark);transition:color .15s ease}
.breadcrumb a:hover{color:#fff}
.hero-title{font-size:clamp(40px,6.8vw,78px);font-weight:700;line-height:1.1;letter-spacing:-.04em;margin-bottom:22px}
.hero-sub{font-size:17px;line-height:1.9;color:var(--muted-dark);max-width:620px;margin-bottom:28px}
.hero-media{
  border-radius:12px;overflow:hidden;border:1px solid rgba(241,234,223,.18);background:var(--dark-soft);
  box-shadow:0 28px 60px -32px rgba(0,0,0,.5);
}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px 16px;margin-top:26px}
.hero-check{display:inline-flex;align-items:center;gap:7px;font-size:13px;color:var(--muted-dark)}
.compat-strip{background:var(--ink);border-bottom:1px solid rgba(255,255,255,.08)}
.compat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.compat-cell{padding:28px 18px;border-right:1px solid rgba(255,255,255,.1);text-align:left}
.compat-cell:last-child{border-right:none}
.compat-cell strong{font-size:17px;color:#fff;font-weight:700}
.compat-cell span{display:block;font-size:13px;color:var(--muted-dark);margin-top:8px;line-height:1.6}
.split-block{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
@media(max-width:1024px){.split-block{grid-template-columns:1fr;gap:40px}}
.ordered-list{list-style:none;counter-reset:step;padding-left:0;margin:0}
.ordered-list li{position:relative;padding-left:52px;margin-bottom:24px}
.ordered-list li::before{
 counter-increment:step;content:counter(step);
 position:absolute;left:0;top:0;width:34px;height:34px;border-radius:7px;
 background:var(--ink);color:#fff;font-weight:700;font-size:13px;
 display:flex;align-items:center;justify-content:center;
}
.ordered-list h3{font-size:18px;font-weight:600;margin-bottom:8px}
.ordered-list p{color:var(--muted);font-size:15px;line-height:1.8;margin-bottom:0}
.mini-note{
  display:flex;gap:12px;background:var(--cream);border-left:3px solid var(--amber);
  padding:16px 18px;border-radius:8px;font-size:15px;color:#56564f;line-height:1.8;
}
.chip-grid{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  background:var(--paper);border:1px solid var(--line);border-radius:999px;
  padding:8px 16px;font-size:13px;color:#484D49;transition:border-color .15s ease,color .15s ease,background .15s ease;
}
.chip:hover{border-color:var(--brand);color:var(--brand)}
.strap-list{margin:0;padding:0;list-style:none}
.strap-list li{display:flex;gap:12px;align-items:flex-start;padding:14px 0;border-bottom:1px solid var(--line)}
.strap-list li:last-child{border-bottom:none}
.strap-list .num{font-size:14px;font-weight:800;color:var(--brand);margin-top:2px}
.os-table{width:100%;border-collapse:separate;border-spacing:0;margin-top:10px}
.os-table th, .os-table td{text-align:left;padding:15px 18px;font-size:15px;border-bottom:1px solid var(--line)}
.os-table th{
  font-size:13px;font-weight:600;color:var(--muted);letter-spacing:.04em;
  background:var(--cream);text-transform:none;
}
.os-table td:first-child{color:var(--ink);font-weight:600}
.os-table tr:last-child td{border-bottom:none}
.table-wrap{
  background:var(--paper);border:1px solid var(--line);border-radius:12px;
  overflow:hidden;box-shadow:var(--shadow-card);
}
.path-step{position:relative;padding-left:78px}
.path-step::before{content:"";position:absolute;left:25px;top:58px;bottom:-42px;width:2px;background:var(--line)}
.path-step:last-child::before{display:none}
.path-step .index{
  position:absolute;left:0;top:2px;width:50px;height:50px;border-radius:50%;
  background:var(--paper);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;color:var(--brand);
}
.faq-list{margin:0;padding:0}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item:first-child{border-top:1px solid var(--line)}
.faq-question{margin:0}
.faq-trigger{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:24px;
  background:transparent;border:0;padding:20px 4px;text-align:left;cursor:pointer;transition:color .15s ease;
}
.faq-trigger span.faq-q{font-size:17px;font-weight:600;line-height:1.6;color:var(--ink)}
.faq-trigger .faq-icon{flex-shrink:0;width:30px;height:30px;border:1px solid var(--line);border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--brand);font-size:16px;font-weight:700;transition:background .15s ease,color .15s ease}
.faq-trigger:hover span.faq-q{color:var(--brand)}
.faq-answer{display:none;padding:0 4px 24px;color:var(--muted);font-size:15px;line-height:1.9}
.faq-item.is-open .faq-answer{display:block}
.faq-item.is-open .faq-icon{background:var(--brand);color:#fff;border-color:var(--brand)}
.faq-icon .minus{display:none}
.faq-item.is-open .faq-icon .plus{display:none}
.faq-item.is-open .faq-icon .minus{display:block}
.side-cross{background:var(--dark);position:relative;color:var(--text-on-dark)}
.side-cross .bg-img{position:absolute;inset:0;object-fit:cover;opacity:.22;width:100%;height:100%}
.bg-mask{position:absolute;inset:0;background:linear-gradient(100deg,rgba(35,32,28,.96),rgba(35,32,28,.83))}
.img-frame{
  border-radius:12px;overflow:hidden;border:1px solid var(--line);background:var(--paper);
  box-shadow:var(--shadow-card);
}
.img-frame img{width:100%;height:100%;object-fit:cover}
.footer-link{color:var(--muted-dark);font-size:14px;transition:color .15s ease}
.footer-link:hover{color:#fff}
.backtop-btn{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14px;color:#fff;border:1px solid rgba(241,234,223,.28);
  padding:9px 18px;border-radius:999px;background:rgba(255,255,255,.04);
  transition:background .15s ease,border-color .15s ease;
}
.backtop-btn:hover{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.6)}
.return-strip{
  background:var(--cream);border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.cmd-overlay{position:fixed;inset:0;z-index:120;background:rgba(31,26,20,.42);backdrop-filter:blur(4px);display:none;align-items:flex-start;justify-content:center;padding:11vh 20px 0}
.cmd-overlay.show{display:flex}
.cmd-panel{width:100%;max-width:580px;background:var(--bg);border:1px solid var(--line);border-radius:14px;box-shadow:0 30px 90px -20px rgba(20,16,12,.35);overflow:hidden}
.cmd-head{display:flex;align-items:center;gap:10px;padding:18px 18px;border-bottom:1px solid var(--line)}
.cmd-head svg{color:var(--muted)}
.cmd-input{background:transparent;border:0;outline:none;flex:1;font-size:17px;color:var(--ink)}
.cmd-input::placeholder{color:#98938c}
.cmd-list{padding:10px;max-height:300px;overflow:auto}
.cmd-item{display:flex;align-items:center;justify-content:space-between;padding:11px 12px;border-radius:8px;color:var(--ink);font-size:15px;cursor:pointer;transition:background .1s ease}
.cmd-item:hover,.cmd-item.keyed{background:var(--ink);color:#fff}
.cmd-item small{color:var(--muted);font-size:12px}
.cmd-empty{display:block;padding:30px 18px;color:var(--muted);text-align:center;font-size:14px}
@media(max-width:1024px){
  .main-nav{display:none}
  .header-inner{height:64px}
  .mobile-menu{top:64px}
  .nav-burger{display:inline-flex}
  .cmd-search{display:none}
  .section{padding:64px 0}
  .compat-grid{grid-template-columns:1fr 1fr}
  .compat-cell{border-bottom:1px solid rgba(255,255,255,.1)}
}
@media(max-width:640px){
  .container-custom{padding-left:18px;padding-right:18px}
  .header-inner{gap:12px}
  .brand-name{font-size:16px}
  .brand-mark{width:32px;height:32px;font-size:15px}
  .brand-year{display:none}
  .btn-block-xl{height:52px;padding:0 22px}
  .compat-grid{grid-template-columns:1fr}
  .compat-cell{border-right:none;padding:20px 14px}
  .hero-title{font-size:38px;letter-spacing:-.03em}
  .mobile-menu{position:fixed}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}
}

/* roulang page: category3 */
:root {
      --bg: #F4F2EC;
      --paper: #FFFDF8;
      --ink: #1F2422;
      --muted: #6D6C66;
      --line: #E2DDD1;
      --brand: #B4542A;
      --brand-deep: #91401F;
      --amber: #D69A4E;
      --dark: #23201C;
      --dark-soft: #2E2A25;
      --cream: #F1EADF;
      --cream-muted: #B7AFA3;
      --footer-text: #8F8778;
      --radius: 8px;
      --shadow-soft: 0 12px 40px -22px rgba(31, 36, 34, 0.18);
      --font-title: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
      --font-serif: "Songti SC", "Noto Serif CJK SC", serif;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: var(--font-title);
      background-color: var(--bg);
      color: var(--ink);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button,
    input {
      font-family: inherit;
    }

    .container-custom {
      width: min(1200px, calc(100% - 40px));
      margin-left: auto;
      margin-right: auto;
    }

    .skip-link {
      position: absolute;
      left: -9999px;
      top: 0;
      z-index: 100;
    }

    .skip-link:focus {
      left: 16px;
      top: 16px;
      background: var(--paper);
      border: 1px solid var(--ink);
      padding: 8px 18px;
    }

    ::selection {
      background: rgba(180, 84, 42, 0.22);
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(244, 242, 236, 0.88);
      -webkit-backdrop-filter: blur(18px);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(226, 221, 209, 0.9);
      transition: background 150ms ease, border-color 150ms ease;
    }

    .site-header.is-scrolled {
      background: rgba(244, 242, 236, 0.94);
      border-bottom-color: var(--line);
    }

    .brand-logo-mark {
      width: 34px;
      height: 34px;
      border-radius: 9px;
      background: var(--dark);
      color: var(--cream);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      flex: 0 0 auto;
      box-shadow: inset 0 0 0 1px rgba(214, 154, 78, 0.2);
    }

    .brand-logo-mark svg {
      width: 18px;
      height: 18px;
    }

    .brand-text {
      font-size: 17px;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
    }

    .brand-sub {
      font-size: 10px;
      letter-spacing: 0.14em;
      color: var(--muted);
      text-transform: uppercase;
      line-height: 1;
      margin-top: 3px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
    }

    .nav-link {
      font-size: 15px;
      color: #55544e;
      position: relative;
      padding: 6px 2px;
      transition: color 150ms ease;
    }

    .nav-link:hover {
      color: var(--ink);
    }

    .nav-link::after {
      content: "";
      position: absolute;
      left: 0;
      right: 100%;
      bottom: -4px;
      height: 2px;
      background: var(--brand);
      transition: right 150ms ease;
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      right: 0;
    }

    .nav-link.active {
      color: var(--ink);
      font-weight: 600;
    }

    .search-btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      height: 38px;
      padding: 0 12px;
      border-radius: 8px;
      border: 1px solid var(--line);
      background: rgba(255, 253, 248, 0.75);
      color: #8c8a83;
      font-size: 13px;
      white-space: nowrap;
      cursor: pointer;
      transition: border-color 150ms ease, width 150ms ease;
    }

    .search-btn:hover {
      border-color: #c4b9a4;
      color: var(--ink);
    }

    .search-btn kbd {
      font-family: inherit;
      font-size: 11px;
      border: 1px solid var(--line);
      border-radius: 5px;
      padding: 1px 5px;
      background: var(--paper);
    }

    .mobile-menu-btn,
    .mobile-close-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 40px;
      height: 40px;
      border-radius: 8px;
      border: 1px solid var(--line);
      background: transparent;
      cursor: pointer;
      color: var(--ink);
    }

    .mobile-panel {
      position: fixed;
      top: 64px;
      bottom: 0;
      right: 0;
      z-index: 60;
      width: min(360px, 88%);
      background: var(--paper);
      border-left: 1px solid var(--line);
      transform: translateX(100%);
      transition: transform 200ms ease;
      overflow-y: auto;
      box-shadow: -30px 0 60px -45px rgba(31, 36, 34, 0.4);
      padding: 24px 20px 36px;
    }

    .mobile-panel.open {
      transform: translateX(0);
    }

    .mobile-overlay {
      position: fixed;
      inset: 0;
      z-index: 55;
      background: rgba(31, 36, 34, 0.32);
      backdrop-filter: blur(2px);
      opacity: 0;
      pointer-events: none;
      transition: opacity 200ms ease;
    }

    .mobile-overlay.open {
      opacity: 1;
      pointer-events: auto;
    }

    .mobile-nav {
      display: flex;
      flex-direction: column;
    }

    .mobile-nav a {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 13px 4px;
      border-bottom: 1px solid var(--line);
      font-size: 15px;
      color: var(--ink);
      font-weight: 500;
    }

    .mobile-nav a.active {
      color: var(--brand);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      height: 44px;
      padding: 0 24px;
      border-radius: 7px;
      border: 1px solid transparent;
      font-size: 15px;
      font-weight: 600;
      line-height: 1;
      white-space: nowrap;
      cursor: pointer;
      transition: background 150ms ease, color 150ms ease, border-color 150ms ease, transform 150ms ease, box-shadow 150ms ease;
    }

    .btn:focus-visible {
      outline: 2px solid var(--brand);
      outline-offset: 2px;
      box-shadow: 0 0 0 5px rgba(180, 84, 42, 0.18);
    }

    .btn-sm {
      height: 38px;
      padding: 0 16px;
      font-size: 14px;
    }

    .btn-lg {
      height: 54px;
      padding: 0 30px;
      font-size: 16px;
    }

    .btn-brand {
      background: var(--brand);
      color: #fff;
    }

    .btn-brand:hover {
      background: var(--brand-deep);
      transform: translateY(-1px);
    }

    .btn-dark {
      background: var(--dark);
      color: var(--cream);
      border-color: var(--dark);
    }

    .btn-dark:hover {
      background: #3a342d;
      transform: translateY(-1px);
    }

    .btn-ghost-dark {
      background: transparent;
      color: var(--ink);
      border-color: var(--ink);
    }

    .btn-ghost-dark:hover {
      background: var(--ink);
      color: var(--cream);
      transform: translateY(-1px);
    }

    .btn-ghost-light {
      background: transparent;
      color: var(--cream);
      border-color: rgba(241, 234, 223, 0.5);
    }

    .btn-ghost-light:hover {
      background: var(--cream);
      color: var(--dark);
      border-color: var(--cream);
      transform: translateY(-1px);
    }

    .btn-plain {
      background: transparent;
      color: var(--cream-muted);
      border-color: rgba(241, 234, 223, 0.16);
    }

    .btn-plain:hover {
      color: var(--cream);
      border-color: rgba(241, 234, 223, 0.5);
    }

    .page-hero {
      position: relative;
      background-color: var(--dark);
      background-image: linear-gradient(105deg, rgba(31, 36, 34, 0.16), rgba(35, 32, 28, 0.94)), url('/assets/images/backpic/back-2.png');
      background-size: cover;
      background-position: right center;
      color: var(--cream);
      overflow: hidden;
    }

    .page-hero::after {
      content: "";
      position: absolute;
      right: -130px;
      bottom: -160px;
      width: 440px;
      height: 440px;
      border-radius: 50%;
      border: 1px solid rgba(214, 154, 78, 0.18);
      pointer-events: none;
    }

    .page-hero .container-custom {
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      height: 32px;
      padding: 0 13px;
      border-radius: 999px;
      border: 1px solid rgba(241, 234, 223, 0.22);
      background: rgba(255, 253, 248, 0.08);
      color: var(--cream-muted);
      font-size: 13px;
    }

    .hero-badge span {
      color: var(--amber);
    }

    .section-wrap {
      padding-top: 72px;
      padding-bottom: 72px;
    }

    .section-heading {
      font-size: clamp(28px, 4vw, 40px);
      font-weight: 650;
      letter-spacing: -0.03em;
      line-height: 1.18;
    }

    .section-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      font-weight: 600;
      letter-spacing: 0.14em;
      color: var(--brand);
      text-transform: uppercase;
    }

    .section-kicker::before {
      content: "";
      width: 18px;
      height: 2px;
      background: var(--brand);
    }

    .surface-card {
      background: var(--paper);
      border: 1px solid var(--line);
      border-radius: 12px;
      box-shadow: var(--shadow-soft);
    }

    .tag {
      display: inline-flex;
      align-items: center;
      height: 25px;
      padding: 0 10px;
      border-radius: 5px;
      background: rgba(180, 84, 42, 0.1);
      color: var(--brand-deep);
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.02em;
    }

    .tag-neutral {
      background: rgba(109, 108, 102, 0.08);
      color: var(--muted);
    }

    .version-table-wrap {
      overflow-x: auto;
      border-radius: 14px;
      border: 1px solid var(--line);
      background: var(--paper);
      box-shadow: var(--shadow-soft);
    }

    .version-table {
      width: 100%;
      min-width: 860px;
      border-collapse: collapse;
    }

    .version-table th {
      background: #F1ECE2;
      color: var(--ink);
      font-size: 14px;
      font-weight: 700;
      text-align: left;
      padding: 16px 18px;
      border-bottom: 1px solid var(--line);
      white-space: nowrap;
    }

    .version-table td {
      padding: 20px 18px;
      font-size: 15px;
      line-height: 1.8;
      border-bottom: 1px solid var(--line);
      vertical-align: top;
      color: #4e4d48;
    }

    .version-table tr:last-child td {
      border-bottom: 0;
    }

    .version-table th:first-child {
      width: 150px;
    }

    .version-table td:first-child {
      font-weight: 650;
      color: var(--ink);
    }

    .version-table tr:hover td {
      background: rgba(255, 253, 248, 0.7);
    }

    .how-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .how-list li {
      display: grid;
      grid-template-columns: 68px 1fr;
      gap: 20px;
      padding: 22px 0;
      border-bottom: 1px solid var(--line);
    }

    .how-list li:last-child {
      border-bottom: 0;
    }

    .how-index {
      font-size: 28px;
      font-weight: 700;
      letter-spacing: -0.04em;
      color: transparent;
      -webkit-text-stroke: 1px var(--brand);
      opacity: 0.85;
    }

    .timeline-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .timeline-list li {
      position: relative;
      display: grid;
      grid-template-columns: 92px 1fr;
      gap: 20px;
      padding: 0 0 30px;
    }

    .timeline-list li:not(:last-child) {
      border-bottom: 1px solid var(--line);
      margin-bottom: 26px;
    }

    .timeline-list time {
      font-size: 14px;
      font-weight: 600;
      padding-top: 4px;
      color: var(--muted);
      white-space: nowrap;
    }

    .faq-item {
      border-bottom: 1px solid var(--line);
      background: transparent;
    }

    .faq-item summary {
      list-style: none;
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      gap: 20px;
      padding: 22px 4px;
      cursor: pointer;
      font-size: 17px;
      font-weight: 650;
      line-height: 1.5;
    }

    .faq-item summary::-webkit-details-marker {
      display: none;
    }

    .faq-item summary:hover {
      color: var(--brand-deep);
    }

    .faq-icon {
      flex: 0 0 auto;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      border: 1px solid var(--line);
      font-size: 18px;
      font-weight: 400;
      transition: transform 160ms ease, background 160ms ease, color 160ms ease;
    }

    .faq-item[open] summary .faq-icon {
      transform: rotate(45deg);
      background: var(--dark);
      color: var(--cream);
      border-color: var(--dark);
    }

    .faq-answer {
      padding: 2px 40px 26px 4px;
      color: var(--muted);
      font-size: 15.5px;
      line-height: 1.9;
    }

    .cta-grand {
      position: relative;
      background-color: var(--dark);
      background-image: linear-gradient(100deg, rgba(35, 32, 28, 0.92), rgba(41, 35, 30, 0.66)), url('/assets/images/backpic/back-3.png');
      background-size: cover;
      background-position: center;
      color: var(--cream);
      overflow: hidden;
      padding: 76px 0;
    }

    .cta-grand::before {
      content: "";
      position: absolute;
      left: -60px;
      bottom: -80px;
      width: 220px;
      height: 220px;
      border-radius: 50%;
      background: rgba(180, 84, 42, 0.18);
      filter: blur(28px);
    }

    .footer {
      background: var(--dark);
      color: var(--cream);
    }

    .footer-title {
      font-size: 22px;
      font-weight: 650;
      letter-spacing: -0.02em;
    }

    .footer-column-title {
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--footer-text);
      margin-bottom: 14px;
    }

    .footer-link {
      display: inline-block;
      padding: 2px 0;
      color: #B7AFA3;
      font-size: 14px;
      line-height: 1.9;
      transition: color 150ms ease;
    }

    .footer-link:hover {
      color: #fff;
    }

    .backtop-btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      height: 36px;
      padding: 0 14px;
      border: 1px solid rgba(241, 234, 223, 0.16);
      border-radius: 6px;
      font-size: 13px;
      color: var(--cream-muted);
      transition: color 150ms ease, border-color 150ms ease;
    }

    .backtop-btn:hover {
      color: var(--cream);
      border-color: rgba(241, 234, 223, 0.5);
    }

    .command-layer {
      position: fixed;
      inset: 0;
      z-index: 80;
      display: flex;
      align-items: flex-start;
      justify-content: center;
      padding: 14vh 16px 24px;
      opacity: 0;
      pointer-events: none;
      transition: opacity 150ms ease;
    }

    .command-layer.open {
      opacity: 1;
      pointer-events: auto;
    }

    .command-backdrop {
      position: absolute;
      inset: 0;
      background: rgba(31, 36, 34, 0.38);
      -webkit-backdrop-filter: blur(6px);
      backdrop-filter: blur(6px);
    }

    .command-box {
      position: relative;
      width: min(580px, 100%);
      background: var(--paper);
      border-radius: 14px;
      border: 1px solid var(--line);
      box-shadow: 0 30px 80px -30px rgba(31, 36, 34, 0.45);
      overflow: hidden;
    }

    .command-box form {
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--line);
    }

    .command-box input {
      flex: 1;
      border: 0;
      outline: 0;
      height: 58px;
      padding: 0 18px 0 6px;
      background: transparent;
      color: var(--ink);
      font-size: 15px;
    }

    .command-hint {
      padding: 12px 18px;
      color: var(--muted);
      font-size: 13px;
    }

    body.no-scroll {
      overflow: hidden;
    }

    @media (max-width: 767px) {
      .container-custom {
        width: calc(100% - 40px);
      }

      .section-wrap {
        padding-top: 52px;
        padding-bottom: 52px;
      }

      .page-hero {
        min-height: auto;
        padding-top: 20px;
      }

      .version-table td,
      .version-table th {
        padding: 15px 13px;
      }

      .how-list li {
        grid-template-columns: 44px 1fr;
        gap: 14px;
        padding: 18px 0;
      }

      .timeline-list li {
        grid-template-columns: 72px 1fr;
        gap: 12px;
      }

      .faq-item summary {
        font-size: 16px;
        padding: 18px 0;
      }

      .faq-answer {
        padding-right: 8px;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
      }
    }