:root{
  --stone-bg:#E8E4DC;--stone-deep:#D6D0C6;--paper:#F6F3ED;--paper-soft:#EFEBE3;
  --ink:#2C2A26;--body:#3A372F;--muted:#6B675E;--light-muted:#8A8478;
  --rock:#6B675E;--deep-rock:#3E3B36;--pale-rock:#C8C2B6;--warm:#F7F3EB;
  --moss:#6A7A58;--clay:#A65A3A;--border:rgba(62,59,54,.16);--border-strong:rgba(166,90,58,.40);
  --shadow:0 12px 28px rgba(44,42,38,.08);--max:1080px;--radius:10px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--stone-bg)}
body{margin:0;background:var(--stone-bg);color:var(--body);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{cursor:pointer}
img{display:block;max-width:100%;height:auto;object-fit:contain;object-position:center}
.site-header{position:fixed;z-index:80;top:0;left:0;right:0}
.header-wrap,.footer-wrap,.content-wrap{width:min(var(--max),calc(100% - 32px));margin:0 auto}
.stone-line{height:22px;background:var(--deep-rock);color:var(--warm);font-size:12px}
.stone-line-inner{height:22px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.text-button{border:0;background:transparent;color:var(--warm);padding:0 2px;min-height:22px}
.rock-bar{height:56px;background:var(--stone-deep);border-bottom:1px solid var(--border)}
.rock-bar-inner{height:56px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand-mark{display:flex;align-items:center;min-height:44px;min-width:120px;font-size:16px;font-weight:700;color:var(--ink)}
.brand-image-slot:empty{display:none}.brand-logo{height:26px;width:auto}.brand-image-slot:not(:empty)+.brand-fallback{display:none}
.rock-actions{display:flex;align-items:center;gap:10px}.rock-drawer-button,.app-link{height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:9px;padding:0 15px;font-size:14px}
.rock-drawer-button{border:1px solid var(--border-strong);background:var(--warm);color:var(--deep-rock)}
.app-link{background:linear-gradient(135deg,#8A8478 0%,#6B675E 55%,#3E3B36 100%);color:var(--warm)}
.rock-tabs{height:38px;background:var(--warm);border-bottom:1px solid var(--border)}
.rock-tabs-inner{height:38px;display:flex;justify-content:center;align-items:center;gap:8px}
.rock-tabs a{height:30px;min-width:86px;display:inline-flex;align-items:center;justify-content:center;border-radius:8px;font-size:13px;color:var(--deep-rock)}
.rock-tabs a.active{background:var(--deep-rock);color:var(--warm)}
.site-main{padding-top:132px;min-height:70vh}.page-shell{padding:34px 0 56px}.hero{margin-bottom:28px}
.eyebrow{display:inline-block;color:var(--clay);font-size:12px;letter-spacing:.08em;font-weight:700;margin-bottom:6px}
h1,h2,h3{color:var(--ink);margin:0 0 12px;line-height:1.3}h1{font-size:24px}h2{font-size:20px}h3{font-size:16px}p{margin:0 0 14px}
.lead{font-size:16px;line-height:1.85;max-width:780px;color:var(--body)}.section{margin-top:28px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:14px}.section-head p{max-width:620px;color:var(--muted);margin:0}
.btn-primary,.btn-secondary{height:42px;display:inline-flex;align-items:center;justify-content:center;padding:0 18px;border-radius:9px;font-size:14px;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,#8A8478 0%,#6B675E 55%,#3E3B36 100%);color:var(--warm)}
.btn-secondary{background:var(--warm);border:1px solid var(--clay);color:var(--deep-rock)}
a:hover,.text-button:hover,.rock-drawer-button:hover{filter:brightness(.97)}a:focus-visible,button:focus-visible{outline:3px solid rgba(166,90,58,.35);outline-offset:2px}
.panel{background:var(--paper);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.image-slot{background:var(--paper-soft);border:1px dashed var(--border);border-radius:10px;display:flex;align-items:center;justify-content:center;overflow:hidden}.image-slot img{width:100%;height:100%;object-fit:contain}
.image-slot.small{height:120px}.image-slot.medium{height:168px}.image-slot.wide{height:190px}.image-slot.banner{height:220px}.image-slot.app{height:min(340px,70vw)}
.home-intro{padding:28px;background:linear-gradient(145deg,var(--paper),var(--stone-deep));border:1px solid var(--border);border-radius:12px}.home-intro .mini-brand{width:52px;height:52px;margin-bottom:18px}
.home-intro .actions{margin-top:20px}.paired-columns{display:grid;grid-template-columns:1fr 1fr;gap:18px}.feature-column{padding:18px}.feature-column .image-slot{margin-bottom:15px}
.number-strips{display:grid;gap:10px}.number-strip{display:grid;grid-template-columns:64px 1fr;gap:16px;align-items:start;padding:16px;background:var(--paper);border:1px solid var(--border);border-radius:9px}.number-strip .mark{font-size:20px;font-weight:800;color:var(--clay)}
.note-columns{display:grid;grid-template-columns:1fr 1fr;gap:18px}.note-card{padding:20px;border-left:4px solid var(--moss);background:var(--paper);border-radius:8px;box-shadow:var(--shadow)}
.shelf-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.shelf-item{min-height:150px;padding:16px;background:var(--warm);border:1px solid var(--border);border-bottom:5px solid var(--rock);border-radius:9px}
.sequence{display:grid;gap:9px}.sequence-item{display:grid;grid-template-columns:54px 1fr;gap:14px;padding:14px 16px;background:var(--paper);border-radius:9px;border:1px solid var(--border)}.sequence-item .cn{font-weight:800;color:var(--moss);font-size:18px}
.node-row{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.node{position:relative;padding:18px;background:var(--paper);border-top:4px solid var(--clay);border-radius:9px}.status{display:inline-flex;padding:3px 8px;border-radius:99px;background:var(--stone-deep);font-size:12px;color:var(--deep-rock);margin-bottom:10px}
.app-promo{padding:22px}.app-promo .image-slot{margin-top:18px}.app-icon{width:48px;height:48px;margin-bottom:10px}.tips-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.tip{padding:18px;background:var(--paper);border:1px solid var(--border);border-radius:9px}
.faq-mini{display:grid;gap:10px}.faq-mini details{background:var(--paper);border:1px solid var(--border);border-radius:9px;padding:13px 16px}.faq-mini summary{font-weight:700;color:var(--ink);cursor:pointer}.brand-block{padding:24px;background:var(--deep-rock);color:var(--warm);border-radius:12px}.brand-block h2{color:var(--warm)}
.long-strips{display:grid;gap:12px}.long-strip{display:grid;grid-template-columns:70px 1fr;gap:18px;padding:18px;background:var(--paper);border:1px solid var(--border);border-radius:9px}.long-strip .tag{font-weight:800;color:var(--clay)}
.observation-list{display:grid;gap:14px}.observation-item{display:grid;grid-template-columns:180px 1fr;gap:20px;padding:18px;border-bottom:1px solid var(--border)}.observation-item:nth-child(odd){background:var(--paper)}
.card-wall{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.wall-card{padding:18px;background:var(--paper);border:1px solid var(--border);border-radius:10px}.wall-card:nth-child(2n){background:var(--paper-soft)}
.memo-board{display:grid;grid-template-columns:1fr 1fr;gap:20px}.memo-column{padding:20px;background:var(--paper);border-radius:10px;border:1px solid var(--border)}.memo-entry{padding:14px 0;border-bottom:1px solid var(--border)}.memo-entry:last-child{border-bottom:0}
.timeline{position:relative;display:grid;gap:18px;padding-left:28px}.timeline:before{content:"";position:absolute;left:9px;top:6px;bottom:6px;width:2px;background:var(--pale-rock)}.timeline-item{position:relative;padding:18px;background:var(--paper);border:1px solid var(--border);border-radius:9px}.timeline-item:before{content:"";position:absolute;left:-26px;top:24px;width:12px;height:12px;border-radius:50%;background:var(--clay);border:3px solid var(--stone-bg)}
.checklist{display:grid;gap:12px}.check-item{display:grid;grid-template-columns:34px 1fr;gap:14px;padding:16px;background:var(--paper);border-radius:9px;border:1px solid var(--border)}.check-dot{width:26px;height:26px;border:2px solid var(--moss);border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--moss);font-weight:800}
.method-steps{counter-reset:method;display:grid;gap:16px}.method-step{counter-increment:method;padding:18px 18px 18px 68px;position:relative;background:var(--paper);border-radius:10px}.method-step:before{content:counter(method,"cjk-ideographic");position:absolute;left:18px;top:18px;width:34px;height:34px;border-radius:8px;background:var(--deep-rock);color:var(--warm);display:flex;align-items:center;justify-content:center;font-weight:800}
.theme-list{display:grid;gap:12px}.theme-row{display:grid;grid-template-columns:160px 1fr 140px;gap:16px;align-items:start;padding:18px;background:var(--paper);border:1px solid var(--border);border-radius:9px}.theme-row .side-note{font-size:13px;color:var(--muted)}
.rack{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.rack-shelf{background:var(--warm);border:1px solid var(--border);border-radius:10px;padding:18px}.rack-shelf h2{border-bottom:4px solid var(--rock);padding-bottom:10px}.rack-items{display:grid;gap:10px}.rack-item{padding:12px;background:var(--paper);border-radius:8px}
.product-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.product-feature{padding:20px;background:var(--paper);border:1px solid var(--border);border-radius:10px}.product-feature:nth-child(3){grid-column:1 / -1}
.install-rail{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.install-step{padding:18px;background:var(--paper);border-top:4px solid var(--moss);border-radius:9px}.install-step .step-label{font-size:12px;color:var(--clay);font-weight:700}
.terms{display:grid;gap:16px}.term-section{padding:20px;background:var(--paper);border-left:4px solid var(--clay);border-radius:8px}.term-section:nth-child(even){border-left-color:var(--moss)}
.help-index{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin-bottom:18px}.help-index a{padding:13px 10px;text-align:center;background:var(--warm);border:1px solid var(--border);border-radius:8px}.help-body{display:grid;grid-template-columns:1fr 1fr;gap:16px}.help-card{padding:18px;background:var(--paper);border-radius:9px;border:1px solid var(--border)}
.faq-list{display:grid;gap:12px}.faq-item{padding:18px 20px;background:var(--paper);border:1px solid var(--border);border-radius:9px}.faq-item h2{font-size:16px;margin-bottom:8px}
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.contact-card{padding:20px;background:var(--paper);border:1px solid var(--border);border-radius:9px}.contact-note{margin-top:18px;padding:20px;background:var(--stone-deep);border-radius:10px}
.about-manifesto{display:grid;grid-template-columns:1.1fr .9fr;gap:20px}.about-copy{padding:22px;background:var(--paper);border-radius:10px}.about-points{display:grid;gap:12px}.about-point{padding:16px;background:var(--paper-soft);border-radius:9px}
.site-footer{background:#2A2824;color:#E8E4DC;border-top:1px solid rgba(232,228,220,.18);font-size:13px}.footer-wrap{padding:34px 0 74px}.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:24px}.footer-brand strong{display:block;font-size:16px}.footer-brand span{display:block;color:#C8C2B6}.footer-logo{height:26px;width:auto}.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;color:#E8E4DC;padding:4px 0}.footer-note{margin-top:24px;max-width:880px;color:#C8C2B6}.footer-copy{margin-top:12px;color:#8A8478}
.site-overlay{position:fixed;inset:0;z-index:90;background:rgba(24,23,21,.42);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.site-overlay.active{opacity:1;visibility:visible}
.rock-drawer{position:fixed;z-index:100;top:0;bottom:0;left:0;width:380px;max-width:88vw;background:var(--paper);transform:translateX(-104%);visibility:hidden;pointer-events:none;transition:transform .25s ease,visibility .25s;overflow:auto;box-shadow:var(--shadow)}
body.drawer-open{overflow:hidden}.drawer-open .rock-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{position:sticky;top:0;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 16px;background:var(--stone-deep);border-bottom:1px solid var(--border)}.drawer-brand{display:flex;align-items:center;gap:10px}.drawer-logo{height:26px}.drawer-brand span{display:block;font-size:11px;color:var(--muted)}.drawer-close,.search-close{min-height:44px;border:1px solid var(--border-strong);background:var(--warm);color:var(--deep-rock);border-radius:8px;padding:0 12px}.drawer-sections{padding:16px}.drawer-sections section{margin-bottom:18px}.drawer-sections h2{font-size:13px;color:var(--clay);margin-bottom:8px}.drawer-sections a{display:grid;gap:2px;padding:11px 0;border-bottom:1px solid var(--border)}.drawer-sections a strong{font-size:14px;color:var(--ink)}.drawer-sections a span{font-size:12px;color:var(--muted)}
.search-panel{position:fixed;z-index:105;top:78px;left:0;right:0;visibility:hidden;pointer-events:none;opacity:0;transition:.2s}.search-open .search-panel{visibility:visible;pointer-events:auto;opacity:1}.search-open{overflow:hidden}.search-card{width:min(760px,calc(100% - 32px));margin:0 auto;background:var(--stone-deep);border:1px solid var(--border);border-radius:0 0 12px 12px;box-shadow:var(--shadow);padding:20px}.search-head{display:flex;justify-content:space-between;align-items:start;gap:16px}.search-card p{color:var(--muted)}.search-presets{display:flex;flex-wrap:wrap;gap:10px}.search-presets a{min-height:44px;display:inline-flex;align-items:center;padding:0 14px;background:var(--warm);border:1px solid var(--border);border-radius:8px}
.mobile-bottom{display:none}
@media (max-width:860px){
  .paired-columns,.note-columns,.memo-board,.product-grid,.about-manifesto,.help-body{grid-template-columns:1fr}.card-wall{grid-template-columns:1fr 1fr}.shelf-grid{grid-template-columns:1fr 1fr}.node-row{grid-template-columns:1fr}.install-rail{grid-template-columns:1fr 1fr}.theme-row{grid-template-columns:120px 1fr}.theme-row .side-note{grid-column:2}.footer-grid{grid-template-columns:1fr 1fr}.help-index{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:640px){
  .header-wrap,.footer-wrap,.content-wrap{width:calc(100% - 32px)}.rock-tabs{display:none}.site-main{padding-top:78px;padding-bottom:56px}.rock-bar-inner{gap:8px}.brand-mark{min-width:0;flex:1}.rock-actions{gap:6px}.rock-drawer-button,.app-link{padding:0 11px}.stone-line-inner>span{max-width:72%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .page-shell{padding:24px 0 36px}.home-intro{padding:22px}.paired-columns,.note-columns,.shelf-grid,.card-wall,.rack,.contact-grid,.tips-grid{grid-template-columns:1fr}.observation-item{grid-template-columns:1fr;gap:10px}.observation-item .image-slot{height:150px}.install-rail{grid-template-columns:1fr}.theme-row{grid-template-columns:1fr}.theme-row .side-note{grid-column:auto}.number-strip,.long-strip{grid-template-columns:44px 1fr}.section-head{align-items:start;flex-direction:column}.help-index{grid-template-columns:1fr 1fr}
  .footer-wrap{padding-bottom:88px}.footer-grid{grid-template-columns:1fr 1fr}.mobile-bottom{position:fixed;z-index:70;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(5,1fr);height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--warm);border-top:1px solid var(--border)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--deep-rock)}.mobile-bottom a.active{background:var(--clay);color:var(--warm)}
  .search-panel{top:0;bottom:0;background:var(--deep-rock)}.search-card{width:100%;height:100%;margin:0;border:0;border-radius:0;background:var(--deep-rock);color:var(--warm);padding:24px 16px}.search-card h2,.search-card .eyebrow{color:var(--warm)}.search-card p{color:#E8E4DC}.search-close{background:var(--warm)}.search-presets a{background:transparent;border-color:rgba(247,243,235,.35);color:var(--warm)}
}