:root{
    --bg:#E8E4DC;
    --deep:#D6D0C6;
    --paper:#F6F3ED;
    --paper2:#EFEBE3;
    --title:#2C2A26;
    --text:#3A372F;
    --muted:#6B675E;
    --soft:#8A8478;
    --rock:#6B675E;
    --rockDeep:#3E3B36;
    --rockLight:#C8C2B6;
    --warm:#F7F3EB;
    --moss:#6A7A58;
    --clay:#A65A3A;
    --line:rgba(62,59,54,.16);
    --strong:rgba(166,90,58,.40);
    --shadow:0 12px 28px rgba(44,42,38,.08);
    --max:1080px;
}
*{box-sizing:border-box}
html{overflow-x:hidden;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:15px/1.7 "PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;overflow-x:hidden}
body.ui-locked{overflow:hidden}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
img{display:block;max-width:100%}
h1,h2,h3{margin:0;color:var(--title);line-height:1.3}
h1{font-size:24px}
h2{font-size:20px}
h3{font-size:16px}
p{margin:0}
.bar-inner,.tabs-inner,.footer-inner,.site-main{width:min(calc(100% - 32px),var(--max));margin:auto}
.skip-link{position:fixed;top:-90px;left:12px;z-index:999;background:var(--warm);padding:8px 12px;border-radius:8px}
.skip-link:focus{top:8px}
.stone-line{position:fixed;inset:0 0 auto;height:22px;background:var(--rockDeep);color:var(--warm);z-index:80;font-size:12px}
.stone-line .bar-inner{height:22px;display:flex;align-items:center;justify-content:space-between;gap:10px}
.text-button{height:22px;min-width:44px;border:0;background:transparent;color:var(--warm);cursor:pointer}
.rock-header{position:fixed;left:0;right:0;top:22px;height:56px;background:rgba(232,228,220,.97);border-bottom:1px solid var(--line);z-index:79}
.header-inner{height:56px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand-mark{display:flex;align-items:center;min-height:44px;font-size:16px;font-weight:700}
.brand-mark img,.footer-logo img,.drawer-brand img{height:26px;width:auto;object-fit:contain;object-position:center}
.header-actions{display:flex;align-items:center;gap:8px}
.header-button,.icon-button,.btn{min-height:44px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer}
.header-button,.icon-button{min-height:44px;white-space:nowrap;padding:0 14px;border:1px solid var(--line);background:var(--warm)}
.header-app,.btn-primary{background:linear-gradient(135deg,#8A8478 0%,#6B675E 55%,#3E3B36 100%);color:var(--warm);border-color:transparent}
.rock-tabs{position:fixed;left:0;right:0;top:78px;height:38px;background:var(--warm);border-bottom:1px solid var(--line);z-index:78}
.tabs-inner{height:38px;display:flex;align-items:center;justify-content:center;gap:8px}
.tabs-inner a{height:30px;min-width:74px;padding:0 14px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:13px}
.tabs-inner a.is-current{background:var(--rockDeep);color:var(--warm)}
.site-main{padding-top:148px;padding-bottom:56px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--clay);font-size:13px;font-weight:700;letter-spacing:.06em}
.eyebrow:before{content:"";width:22px;height:1px;background:var(--clay)}
.page-head{padding:28px 0 22px;margin-bottom:26px;border-bottom:1px solid var(--line)}
.page-head .lead{max-width:820px;margin-top:12px;color:var(--muted)}
.btn{padding:0 17px;white-space:nowrap;border:1px solid transparent;font-size:14px}
.btn-secondary{background:var(--warm);border-color:var(--clay);color:var(--rockDeep)}
a:focus-visible,button:focus-visible{outline:3px solid rgba(166,90,58,.35);outline-offset:2px}
a:hover,.header-button:hover,.btn:hover{filter:brightness(.98)}
.media-slot{background:var(--paper2);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-sm{height:168px}.media-md{height:190px}.media-banner{height:220px}.media-app{height:min(340px,58vw)}.media-icon{width:64px;height:64px}
.section{margin:34px 0}
.section-title{margin-bottom:16px}.section-title p{margin-top:7px;color:var(--muted)}
.intro-stone{padding:34px;border:1px solid var(--line);border-radius:12px;background:linear-gradient(145deg,var(--paper),var(--deep));box-shadow:var(--shadow)}
.intro-stone h1{margin-top:8px}.intro-stone p{max-width:780px;margin-top:14px;color:var(--muted)}.intro-stone .btn{margin-top:18px}.micro-brand img{height:26px;object-fit:contain}
.split-feature{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.feature-panel{padding:18px;background:var(--paper);border:1px solid var(--line);border-radius:11px;box-shadow:var(--shadow)}
.feature-panel h2{margin:14px 0 8px}.feature-panel p{color:var(--muted);margin-bottom:14px}
.number-strip{display:grid;grid-template-columns:72px 1fr;gap:16px;padding:18px 0;border-top:1px solid var(--line)}
.number-strip:last-child{border-bottom:1px solid var(--line)}.number-strip .mark{font-size:24px;color:var(--clay);font-weight:700}.number-strip p{margin-top:6px;color:var(--muted)}
.note-columns{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.note-sheet{padding:20px;background:var(--paper);border-left:4px solid var(--moss);border-radius:0 10px 10px 0}
.note-sheet p{margin-top:8px;color:var(--muted)}
.shelf-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.shelf-item{min-height:150px;padding:17px;background:var(--paper);border:1px solid var(--line);border-radius:9px;display:flex;flex-direction:column;justify-content:space-between}
.shelf-item span{font-size:13px;color:var(--soft)}.shelf-item p{margin-top:8px;color:var(--muted)}.shelf-item a{margin-top:14px;color:var(--clay);font-weight:700}
.sequence-list{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
.sequence-item{min-height:155px;padding:18px;border-radius:10px;background:var(--rockDeep);color:var(--warm)}
.sequence-item h3{margin:6px 0 8px;color:var(--warm)}.sequence-item .mark{font-size:13px;color:#E7C9B9}.sequence-item p{color:#EFEAE0}
.timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:0;padding:8px 0 12px}
.timeline-node{position:relative;min-width:0;padding:28px 14px 10px;border-top:2px solid var(--rockLight)}
.timeline-node:before{content:"";position:absolute;left:16px;top:-7px;width:12px;height:12px;border-radius:50%;background:var(--clay)}
.timeline-node span{font-size:13px;color:var(--moss)}.timeline-node strong{display:block;margin-top:2px}.timeline-node p{margin-top:7px;color:var(--muted)}
.app-story{padding:22px;background:var(--paper);border:1px solid var(--line);border-radius:12px}.app-story .media-app{margin-top:20px}.app-story p{margin-top:9px;color:var(--muted)}.app-story .btn{margin-top:15px}
.lower-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.read-card,.brand-card{padding:20px;background:var(--paper2);border:1px solid var(--line);border-radius:10px}.read-card p,.brand-card p{margin-top:8px;color:var(--muted)}.read-card .btn,.brand-card .btn{margin-top:14px}
.faq-mini details{padding:12px 0;border-top:1px solid var(--line)}.faq-mini details:last-child{border-bottom:1px solid var(--line)}.faq-mini summary{font-weight:700;cursor:pointer}.faq-mini p{padding-top:8px;color:var(--muted)}
.observation-directory{display:grid;grid-template-columns:220px 1fr;gap:16px}
.observation-directory nav{position:sticky;top:136px;height:max-content;padding:16px;border-radius:10px;background:var(--rockDeep);color:var(--warm)}
.observation-directory nav a{display:block;padding:10px;border-bottom:1px solid rgba(255,255,255,.12)}
.observation-content section{margin-bottom:14px;padding:20px;background:var(--paper);border:1px solid var(--line);border-radius:10px}.observation-content p{margin-top:8px;color:var(--muted)}
.card-wall{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.wall-card{min-height:220px;padding:18px;background:var(--paper);border:1px solid var(--line);border-radius:11px}.wall-card:nth-child(2n){background:var(--paper2)}.wall-card p{margin-top:10px;color:var(--muted)}
.memo-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.memo-card{padding:20px;background:var(--warm);border:1px solid var(--line);border-radius:10px}.memo-card h2{padding-bottom:8px;border-bottom:1px solid var(--line)}.memo-card h3{margin-top:16px}.memo-card p{margin-top:6px;color:var(--muted)}
.alpha-track{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
.alpha-block{padding:18px;background:var(--paper);border-top:5px solid var(--clay);border-radius:9px}.alpha-block>span{font-size:24px;font-weight:700;color:var(--clay)}.alpha-block h2{margin:8px 0}.alpha-block p{color:var(--muted)}
.status-board{display:grid;grid-template-columns:repeat(4,1fr);padding-bottom:12px}.status-card{min-width:0;padding:18px;background:var(--paper);border:1px solid var(--line)}.status-card+.status-card{border-left:0}.status-card .status{display:inline-block;margin-bottom:12px;padding:3px 8px;border-radius:999px;background:#E5E8DE;color:#48573B;font-size:12px}.status-card p{margin-top:8px;color:var(--muted)}
.checklist{max-width:860px;margin:auto}.check-row{display:grid;grid-template-columns:56px 1fr;gap:16px;padding:18px 0;border-bottom:1px solid var(--line)}.check-mark{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--rockDeep);color:var(--warm);font-weight:700}.check-row p{margin-top:7px;color:var(--muted)}
.method-steps{counter-reset:method;max-width:900px;margin:auto}.method-step{counter-increment:method;display:grid;grid-template-columns:110px 1fr;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}.method-step:before{content:"方法 " counter(method, cjk-ideographic);color:var(--clay);font-weight:700}.method-step p{margin-top:7px;color:var(--muted)}
.theme-list{display:grid;gap:12px}.theme-row{display:grid;grid-template-columns:180px 1fr auto;gap:16px;align-items:center;padding:18px;background:var(--paper);border:1px solid var(--line);border-radius:10px}.theme-row p{color:var(--muted)}
.cabinet{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.cabinet section{padding:17px;background:var(--paper);border:1px solid var(--line);border-radius:9px;box-shadow:inset 0 -5px 0 var(--deep)}.cabinet p{margin-top:9px;color:var(--muted)}.cabinet a{display:inline-block;margin-top:12px;color:var(--clay);font-weight:700}
.product-flow{display:grid;grid-template-columns:1.1fr .9fr;gap:22px;align-items:start}.product-panel{padding:22px;background:var(--paper);border:1px solid var(--line);border-radius:12px}.product-feature{padding:16px 0;border-bottom:1px solid var(--line)}.product-feature:last-child{border-bottom:0}.product-feature p{margin-top:7px;color:var(--muted)}
.install-steps{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.install-step{padding:20px;background:var(--paper);border:1px solid var(--line);border-radius:10px}.install-step b{color:var(--clay)}.install-step p{margin-top:8px;color:var(--muted)}
.terms{max-width:900px;margin-left:auto;margin-right:auto}.term-section{padding:22px 0;border-bottom:1px solid var(--line)}.term-section p{margin-top:9px;color:var(--muted)}
.help-index{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin-bottom:22px}.help-index a{padding:15px;text-align:center;background:var(--paper);border:1px solid var(--line);border-radius:9px;font-weight:700}
.help-body section{margin-bottom:14px;padding:20px;background:var(--paper);border-left:4px solid var(--clay);border-radius:0 10px 10px 0}.help-body p{margin-top:7px;color:var(--muted)}
.faq-list{max-width:920px;margin:auto}.faq-item{margin-bottom:12px;padding:20px;background:var(--paper);border:1px solid var(--line);border-radius:10px}.faq-item h2{font-size:17px}.faq-item p{margin-top:9px;color:var(--muted)}
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.contact-card{padding:20px;background:var(--paper);border:1px solid var(--line);border-radius:10px}.contact-card p{margin-top:8px;color:var(--muted)}
.about-rails{display:grid;grid-template-columns:260px 1fr;gap:22px}.brand-side{position:sticky;top:136px;height:max-content}.about-copy section{padding:20px 0;border-bottom:1px solid var(--line)}.about-copy p{margin-top:8px;color:var(--muted)}
.site-footer{background:#2A2824;color:#E8E4DC;border-top:1px solid rgba(200,194,182,.25);padding:34px 0 calc(34px + env(safe-area-inset-bottom));font-size:13px}
.footer-brand{display:grid;grid-template-columns:260px 1fr;gap:28px;padding-bottom:24px;border-bottom:1px solid rgba(200,194,182,.18)}.footer-logo{display:flex;align-items:center;gap:10px}.footer-logo div{display:flex;flex-direction:column}.footer-logo span{font-size:11px;color:#C8C2B6}.footer-brand p{color:#D6D0C6}
.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;padding:24px 0}.footer-groups h2{font-size:13px;color:#F7F3EB;margin-bottom:8px}.footer-groups a{display:block;padding:3px 0;color:#D6D0C6}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;padding-top:16px;border-top:1px solid rgba(200,194,182,.18);color:#C8C2B6}
.ui-overlay{position:fixed;inset:0;z-index:90;background:rgba(42,40,36,.48);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.ui-overlay.is-active{opacity:1;visibility:visible;pointer-events:auto}
.rock-drawer{position:fixed;left:0;top:0;bottom:0;z-index:100;width:min(380px,88vw);background:var(--warm);box-shadow:var(--shadow);transform:translateX(-102%);visibility:hidden;pointer-events:none;transition:.24s ease}
body.drawer-open .rock-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{height:66px;padding:0 16px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.drawer-brand{display:flex;align-items:center;gap:10px}.drawer-scroll{height:calc(100% - 66px);overflow:auto;padding:14px 16px 28px}.drawer-scroll section+section{margin-top:18px}.drawer-scroll h2{font-size:13px;color:var(--clay);margin-bottom:6px}.drawer-scroll a{display:block;padding:10px 0;border-bottom:1px solid var(--line)}.drawer-scroll a strong,.drawer-scroll a span{display:block}.drawer-scroll a span{font-size:12px;color:var(--muted);margin-top:2px}
.search-layer{position:fixed;left:0;right:0;top:78px;z-index:99;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}body.search-open .search-layer{opacity:1;visibility:visible;pointer-events:auto}.search-card{width:min(calc(100% - 32px),760px);margin:12px auto 0;padding:20px;background:var(--paper);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow)}.search-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}.search-head h2{margin-top:5px}.search-card>p{margin-top:10px;color:var(--muted)}.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.search-presets a{min-height:44px;padding:0 16px;display:flex;align-items:center;background:var(--warm);border:1px solid var(--line);border-radius:9px}
.mobile-bottom{display:none}
@media(max-width:820px){
    .site-main{padding-top:110px;padding-bottom:80px}.rock-tabs{display:none}
    .split-feature,.note-columns,.lower-grid,.memo-grid,.product-flow,.about-rails,.footer-brand{grid-template-columns:1fr}
    .sequence-list,.alpha-track{grid-template-columns:1fr 1fr}.shelf-grid,.cabinet{grid-template-columns:1fr 1fr}.card-wall{grid-template-columns:1fr 1fr}.timeline,.status-board{grid-template-columns:1fr 1fr}
    .observation-directory{grid-template-columns:1fr}.observation-directory nav{position:static;display:flex;flex-wrap:wrap;gap:6px}.observation-directory nav a{white-space:nowrap;border-bottom:0}
    .theme-row{grid-template-columns:1fr}.help-index{grid-template-columns:1fr 1fr}.brand-side{position:static}.footer-groups{grid-template-columns:1fr 1fr}
    .search-layer{top:0;bottom:0;background:var(--rockDeep)}.search-card{width:100%;height:100%;margin:0;padding:72px 20px 20px;border:0;border-radius:0;background:var(--rockDeep);color:var(--warm)}.search-card h2,.search-card .eyebrow,.search-card p{color:var(--warm)}.search-card .icon-button,.search-presets a{background:var(--warm);color:var(--rockDeep)}
    .mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:70;min-height:48px;padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(5,1fr);background:var(--warm);border-top:1px solid var(--line)}.mobile-bottom a{min-height:48px;display:flex;align-items:center;justify-content:center;font-size:12px}.mobile-bottom a.is-current{background:var(--clay);color:var(--warm)}
    .site-footer{padding-bottom:calc(76px + env(safe-area-inset-bottom))}
}
@media(max-width:560px){
    .stone-line .bar-inner span{max-width:74%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.brand-mark{max-width:42%}.brand-mark img{max-width:100%}.header-actions{gap:6px}.header-button{padding:0 10px}
    .intro-stone{padding:24px 18px}.split-feature,.note-columns,.lower-grid,.memo-grid,.install-steps,.contact-grid,.shelf-grid,.cabinet,.sequence-list,.alpha-track,.card-wall,.timeline,.status-board{grid-template-columns:1fr}
    .number-strip,.check-row,.method-step{grid-template-columns:1fr}.number-strip .mark{font-size:19px}.footer-bottom{flex-direction:column}.media-app{height:320px}
}