:root{
    --bg:#E8E4DC;
    --deep-bg:#D6D0C6;
    --paper:#F6F3ED;
    --soft:#EFEBE3;
    --ink:#2C2A26;
    --body:#3A372F;
    --muted:#6B675E;
    --aux:#8A8478;
    --rock:#6B675E;
    --deep-rock:#3E3B36;
    --light-rock:#C8C2B6;
    --warm:#F7F3EB;
    --moss:#6A7A58;
    --clay:#A65A3A;
    --line:rgba(62,59,54,.16);
    --line-strong:rgba(166,90,58,.40);
    --shadow:0 12px 28px rgba(44,42,38,.08);
    --radius:10px;
    --max:1080px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
    margin:0;
    background:var(--bg);
    color:var(--body);
    font-family:"Microsoft YaHei","PingFang SC","Noto Sans CJK SC",Arial,sans-serif;
    font-size:15px;
    line-height:1.7;
    overflow-x:hidden;
}
body.panel-open{overflow:hidden}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{cursor:pointer}
img{max-width:100%;display:block}
.skip-link{
    position:fixed;left:12px;top:-60px;z-index:2000;
    background:var(--warm);color:var(--deep-rock);padding:8px 12px;border-radius:8px;
}
.skip-link:focus{top:8px}
.stone-line{
    position:fixed;top:0;left:0;right:0;height:22px;z-index:1000;
    background:var(--deep-rock);color:var(--warm);font-size:12px;
}
.stone-line-inner,.rock-bar-inner,.rock-tabs-inner,.footer-inner{
    width:min(var(--max),calc(100% - 32px));margin:0 auto;
}
.stone-line-inner{height:22px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.text-button{
    border:0;background:transparent;color:var(--warm);padding:0 4px;min-height:22px;
}
.rock-bar{
    position:fixed;top:22px;left:0;right:0;height:56px;z-index:990;
    background:var(--bg);border-bottom:1px solid var(--line);
}
.rock-bar-inner{height:56px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand-link{display:flex;align-items:center;min-height:44px;max-width:52%}
.brand-logo{height:26px;width:auto;object-fit:contain;object-position:center}
.brand-fallback{font-size:16px;font-weight:800;color:var(--ink);white-space:nowrap}
.rock-actions{display:flex;align-items:center;gap:8px}
.drawer-button,.app-button,.icon-button{
    min-height:44px;display:inline-flex;align-items:center;justify-content:center;
    border-radius:9px;padding:0 14px;font-size:14px;white-space:nowrap;
}
.drawer-button,.icon-button{background:var(--warm);color:var(--deep-rock);border:1px solid var(--line-strong)}
.app-button{
    background:linear-gradient(135deg,#8A8478 0%,#6B675E 55%,#3E3B36 100%);
    color:var(--warm);border:1px solid transparent;
}
.rock-tabs{
    position:fixed;top:78px;left:0;right:0;height:38px;z-index:980;
    background:var(--warm);border-bottom:1px solid var(--line);
}
.rock-tabs-inner{height:38px;display:flex;align-items:center;justify-content:center;gap:8px}
.rock-tabs a{
    min-height:30px;padding:3px 16px;border-radius:8px;display:flex;align-items:center;
    font-size:13px;color:var(--deep-rock);
}
.rock-tabs a.is-current{background:var(--deep-rock);color:var(--warm)}
.site-main{padding-top:116px;min-height:60vh}
.container{width:min(var(--max),calc(100% - 32px));margin:0 auto}
.section{padding:48px 0}
.section.compact{padding:34px 0}
.section + .section{border-top:1px solid var(--line)}
.hero-intro{padding:54px 0 44px}
.hero-intro .eyebrow,.page-head .eyebrow{font-size:12px;letter-spacing:.08em;color:var(--clay);font-weight:800}
h1,h2,h3{color:var(--ink);margin:0 0 14px;line-height:1.35}
h1{font-size:24px}
h2{font-size:20px}
h3{font-size:16px}
p{margin:0 0 14px}
.lead{font-size:16px;max-width:760px}
.meta-note{color:var(--muted);font-size:13px}
.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.primary-button,.secondary-button{
    min-height:44px;padding:8px 18px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;
    font-size:14px;line-height:1;white-space:nowrap;
}
.primary-button{
    background:linear-gradient(135deg,#8A8478 0%,#6B675E 55%,#3E3B36 100%);
    color:var(--warm);border:1px solid transparent;
}
.secondary-button{background:var(--warm);color:var(--deep-rock);border:1px solid var(--clay)}
a:hover,.text-button:hover,button:hover{filter:brightness(.98)}
a:focus-visible,button:focus-visible,input:focus-visible{
    outline:3px solid rgba(166,90,58,.28);outline-offset:2px;
}
.surface{
    background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
}
.soft-surface{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius)}
.media-slot{
    min-height:140px;background:var(--soft);border:1px solid var(--line);border-radius:10px;
    display:flex;align-items:center;justify-content:center;overflow:hidden;
}
.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}
.media-168{height:168px}
.media-190{height:190px}
.media-220{height:220px}
.media-app{height:min(340px,70vw)}
.media-icon{width:64px;height:64px;min-height:64px}
.two-feature{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.feature-panel{padding:20px}
.feature-panel .media-slot{margin-bottom:18px}
.number-strips{display:grid;gap:10px}
.number-strip{
    display:grid;grid-template-columns:70px 1fr;gap:18px;align-items:start;
    padding:18px 20px;background:var(--paper);border:1px solid var(--line);border-radius:10px;
}
.number-strip .mark{
    font-weight:900;color:var(--clay);font-size:18px;letter-spacing:.15em;
}
.note-columns{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.note-card{padding:22px;background:var(--paper);border:1px solid var(--line);border-radius:10px}
.note-card ul,.plain-list{margin:12px 0 0;padding-left:20px}
.shelf-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.shelf-cell{
    min-height:150px;padding:18px;background:var(--paper);border:1px solid var(--line);border-radius:10px;
    display:flex;flex-direction:column;justify-content:space-between;
}
.shelf-cell small{color:var(--muted)}
.sequence-list{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
.sequence-item{
    padding:18px 14px;background:var(--deep-rock);color:var(--warm);border-radius:10px;min-height:150px;
}
.sequence-item h3,.sequence-item p{color:var(--warm)}
.sequence-item .mark{color:#F2D8C9;font-weight:900}
.timeline{
    display:grid;grid-template-columns:repeat(3,1fr);gap:0;position:relative;margin-top:20px;
}
.timeline:before{
    content:"";position:absolute;left:7%;right:7%;top:18px;height:2px;background:var(--light-rock);
}
.timeline-node{position:relative;padding:42px 16px 18px}
.timeline-node:before{
    content:"";position:absolute;top:11px;left:16px;width:14px;height:14px;border-radius:50%;
    background:var(--clay);border:4px solid var(--warm);box-shadow:0 0 0 1px var(--line-strong);
}
.timeline-node strong{display:block;margin-bottom:8px;color:var(--ink)}
.app-block{padding:24px}
.app-art{margin-top:20px;display:grid;place-items:center}
.read-points{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.read-point{padding:18px;background:var(--soft);border-radius:10px;border:1px solid var(--line)}
.faq-mini{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.faq-mini article{padding:18px;background:var(--paper);border-radius:10px;border:1px solid var(--line)}
.brand-story{padding:24px;background:var(--deep-rock);color:var(--warm);border-radius:12px}
.brand-story h2,.brand-story p{color:var(--warm)}
.page-head{padding:44px 0 28px}
.page-head .head-grid{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:24px;align-items:center}
.page-head .media-slot{width:100%}
.page-copy{max-width:820px}
.card-wall{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.info-card{padding:20px;background:var(--paper);border:1px solid var(--line);border-radius:10px;min-height:200px}
.observation-directory{display:grid;grid-template-columns:220px 1fr;gap:20px}
.observation-index{padding:20px;align-self:start;position:sticky;top:132px}
.observation-index a{display:block;padding:8px 0;border-bottom:1px solid var(--line);color:var(--deep-rock)}
.observation-body{display:grid;gap:16px}
.observation-body article{padding:22px}
.memo-list{display:grid;gap:12px}
.memo-row{display:grid;grid-template-columns:130px 1fr;gap:18px;padding:18px 20px;background:var(--paper);border:1px solid var(--line);border-radius:10px}
.method-stack{display:grid;gap:18px}
.method-step{display:grid;grid-template-columns:80px 1fr;gap:20px;padding:22px;border:1px solid var(--line);background:var(--paper);border-radius:10px}
.method-step .step-mark{font-weight:900;color:var(--clay);font-size:18px}
.theme-list{display:grid;gap:14px}
.theme-row{padding:22px;border-left:5px solid var(--moss);background:var(--paper);border-radius:0 10px 10px 0}
.product-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:22px}
.product-copy,.product-side{padding:22px}
.terms{display:grid;gap:16px}
.term-block{padding:22px;background:var(--paper);border:1px solid var(--line);border-radius:10px}
.term-block h2{margin-bottom:10px}
.faq-full{display:grid;gap:12px}
.faq-full details{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:0 18px}
.faq-full summary{cursor:pointer;padding:18px 0;font-weight:800;color:var(--ink)}
.faq-full details p{padding:0 0 18px;margin:0}
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.contact-card{padding:22px;background:var(--paper);border:1px solid var(--line);border-radius:10px}
.callout{
    padding:18px 20px;background:var(--warm);border:1px solid var(--line-strong);border-radius:10px;color:var(--deep-rock);
}
.site-footer{background:#2A2824;color:#E8E4DC;border-top:1px solid rgba(200,194,182,.35);padding:42px 0 80px}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:28px}
.footer-logo{height:26px;width:auto;object-fit:contain}
.footer-brand span{display:block;font-size:12px;color:#C8C2B6}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.footer-grid h2{font-size:13px;color:#F7F3EB;margin-bottom:10px}
.footer-grid a{display:block;font-size:13px;color:#E8E4DC;padding:4px 0}
.footer-note,.footer-copy{font-size:13px;color:#C8C2B6}
.footer-note{margin-top:26px;padding-top:20px;border-top:1px solid rgba(200,194,182,.22)}
.screen-overlay{
    position:fixed;inset:0;z-index:1090;background:rgba(42,40,36,.48);opacity:0;visibility:hidden;
    transition:.2s ease;pointer-events:none;
}
.screen-overlay.is-open{opacity:1;visibility:visible}
.rock-drawer{
    position:fixed;z-index:1120;left:0;top:0;bottom:0;width:380px;max-width:88vw;
    background:var(--paper);color:var(--body);transform:translateX(-102%);transition:.22s ease;
    visibility:hidden;pointer-events:none;box-shadow:20px 0 40px rgba(0,0,0,.12);
}
.rock-drawer.is-open{transform:translateX(0);visibility:visible}
.drawer-head{
    min-height:72px;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;
    border-bottom:1px solid var(--line);background:var(--warm);
}
.drawer-brand{display:flex;align-items:center;gap:10px}
.drawer-scroll{height:calc(100% - 72px);overflow-y:auto;padding:16px}
.drawer-group{padding:8px 0 14px}
.drawer-group h2{font-size:13px;color:var(--clay);margin-bottom:4px}
.drawer-group a{display:block;padding:11px 8px;border-bottom:1px solid var(--line);border-radius:8px}
.drawer-group a:hover{background:var(--soft)}
.drawer-group strong{display:block;color:var(--ink)}
.drawer-group span{display:block;font-size:12px;color:var(--muted);margin-top:2px}
.search-layer{
    position:fixed;z-index:1110;left:0;right:0;top:78px;visibility:hidden;opacity:0;pointer-events:none;
    transition:.18s ease;
}
.search-layer.is-open{visibility:visible;opacity:1}
.search-card{
    width:min(760px,calc(100% - 32px));margin:12px auto;background:var(--paper);border:1px solid var(--line);
    box-shadow:var(--shadow);border-radius:12px;padding:20px;
}
.search-head{display:flex;justify-content:space-between;align-items:flex-start;gap:18px}
.search-head p{font-size:13px;color:var(--muted);margin:4px 0 0}
.search-label{display:block;font-size:12px;color:var(--muted);margin:16px 0 6px}
#siteSearch{
    width:100%;min-height:46px;border:1px solid var(--line-strong);border-radius:9px;background:var(--warm);
    color:var(--deep-rock);padding:8px 12px;
}
.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.search-presets a{padding:8px 12px;border-radius:8px;background:var(--soft);border:1px solid var(--line)}
.mobile-bottom{display:none}

@media (max-width: 860px){
    .page-head .head-grid,.product-grid{grid-template-columns:1fr}
    .card-wall{grid-template-columns:1fr 1fr}
    .shelf-grid{grid-template-columns:1fr 1fr}
    .sequence-list{grid-template-columns:1fr 1fr}
    .sequence-item:last-child{grid-column:1/-1}
    .read-points{grid-template-columns:1fr 1fr}
    .footer-grid{grid-template-columns:1fr 1fr}
    .observation-directory{grid-template-columns:1fr}
    .observation-index{position:static}
}
@media (max-width: 640px){
    body{padding-bottom:calc(48px + env(safe-area-inset-bottom))}
    .stone-line-inner,.rock-bar-inner,.footer-inner,.container{width:calc(100% - 32px)}
    .rock-tabs{display:none}
    .site-main{padding-top:78px}
    .brand-link{max-width:44%}
    .brand-logo{max-width:100%;height:24px}
    .drawer-button,.app-button{padding:0 10px;min-height:44px}
    .hero-intro{padding:38px 0 30px}
    .section{padding:34px 0}
    .two-feature,.note-columns,.faq-mini,.contact-grid{grid-template-columns:1fr}
    .number-strip,.memo-row,.method-step{grid-template-columns:1fr;gap:8px}
    .card-wall,.shelf-grid,.read-points{grid-template-columns:1fr}
    .sequence-list{grid-template-columns:1fr}
    .sequence-item:last-child{grid-column:auto}
    .timeline{grid-template-columns:1fr}
    .timeline:before{left:22px;right:auto;top:24px;bottom:24px;width:2px;height:auto}
    .timeline-node{padding:10px 14px 10px 54px}
    .timeline-node:before{top:18px;left:15px}
    .page-head{padding:34px 0 20px}
    .search-layer{top:0;bottom:0;background:var(--deep-rock);color:var(--warm)}
    .search-card{
        width:100%;height:100%;margin:0;border:0;border-radius:0;background:var(--deep-rock);color:var(--warm);
        box-shadow:none;padding:22px 16px;
    }
    .search-head strong,.search-head p,.search-label{color:var(--warm)}
    .search-card .icon-button{background:var(--warm);color:var(--deep-rock)}
    .search-presets a{background:#4C4943;color:var(--warm);border-color:rgba(247,243,235,.2)}
    #siteSearch{background:var(--warm);color:var(--deep-rock)}
    .mobile-bottom{
        position:fixed;z-index:970;left:0;right:0;bottom:0;height:calc(48px + env(safe-area-inset-bottom));
        display:grid;grid-template-columns:repeat(5,1fr);background:var(--warm);border-top:1px solid var(--line);
        padding-bottom:env(safe-area-inset-bottom);
    }
    .mobile-bottom a{display:flex;align-items:center;justify-content:center;font-size:12px;min-width:0}
    .mobile-bottom a.is-current{background:var(--clay);color:var(--warm)}
    .site-footer{padding-bottom:86px}
}
@media (prefers-reduced-motion: reduce){
    *{scroll-behavior:auto!important;transition:none!important}
}