:root{
  --bg:#E8E4DC;--deep-bg:#D6D0C6;--paper:#F6F3ED;--soft:#EFEBE3;--ink:#2C2A26;--body:#3A372F;--muted:#6B675E;--quiet:#8A8478;--rock:#6B675E;--deep:#3E3B36;--light:#C8C2B6;--warm:#F7F3EB;--moss:#6A7A58;--clay:#A65A3A;--line:rgba(62,59,54,.16);--focus:rgba(166,90,58,.40);--shadow:0 12px 28px rgba(44,42,38,.08);--max:1080px
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden}
body{margin:0;background:var(--bg);color:var(--body);font:15px/1.7 system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;overflow-x:hidden}
body.ui-locked{overflow:hidden}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
button,input{font:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
.site-header{position:fixed;inset:0 0 auto;z-index:80}
.stone-line{height:22px;background:var(--deep);color:var(--warm);font-size:12px}
.stone-line-inner,.rock-bar-inner,.rock-tags-inner,.section-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-control{border:0;background:transparent;color:var(--warm);height:22px;padding:0 2px;font-size:12px}
.rock-bar{height:56px;background:var(--deep-bg);border-bottom:1px solid var(--line)}
.rock-bar-inner{height:56px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand-link{min-height:44px;display:inline-flex;align-items:center;max-width:55%}
.brand-logo,.drawer-logo,.footer-logo{height:26px;width:auto;object-fit:contain;object-position:center}
.brand-fallback{font-weight:800;font-size:16px;color:var(--deep)}
.rock-actions{display:flex;align-items:center;gap:8px}
.drawer-button,.app-button{height:44px;min-width:76px;padding:0 14px;border-radius:9px;border:1px solid var(--focus);display:inline-flex;align-items:center;justify-content:center;font-size:14px;white-space:nowrap}
.drawer-button{background:var(--warm);color:var(--deep)}
.app-button{background:linear-gradient(135deg,#8A8478 0%,#6B675E 55%,#3E3B36 100%);color:var(--warm);border-color:transparent}
.drawer-button:hover,.app-button:hover,.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.rock-tags{height:38px;background:var(--warm);border-bottom:1px solid var(--line)}
.rock-tags-inner{height:38px;display:flex;align-items:center;justify-content:center;gap:10px}
.rock-tags a{height:30px;min-width:74px;padding:0 14px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;color:var(--deep);font-size:13px}
.rock-tags a:hover,.rock-tags a.is-active{background:var(--deep);color:var(--warm)}
.site-main{padding-top:116px;min-height:70vh}
.page-section{padding:48px 0}
.page-section.compact{padding:34px 0}
.page-section.alt{background:var(--soft)}
.page-section.deep{background:var(--deep);color:var(--warm)}
.page-section.paper{background:var(--paper)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12px;letter-spacing:.08em;color:var(--clay);font-weight:800;margin-bottom:10px}
h1,h2,h3,p{margin-top:0}
h1{font-size:24px;line-height:1.3;color:var(--ink);margin-bottom:14px}
h2{font-size:20px;line-height:1.35;color:var(--ink);margin-bottom:12px}
h3{font-size:16px;line-height:1.4;color:var(--ink);margin-bottom:8px}
.deep h1,.deep h2,.deep h3{color:var(--warm)}
p{margin-bottom:14px}
.lede{max-width:780px;font-size:16px;line-height:1.75;color:var(--body)}
.deep .lede,.deep p{color:#EEE9E0}
.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.btn{height:42px;padding:0 18px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;white-space:nowrap;border:1px solid transparent;transition:.18s ease}
.btn.primary{background:linear-gradient(135deg,#8A8478 0%,#6B675E 55%,#3E3B36 100%);color:var(--warm)}
.btn.secondary{background:var(--warm);color:var(--deep);border-color:var(--clay)}
.media-slot{background:var(--warm);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-slot.short{height:168px}.media-slot.medium{height:190px}.media-slot.banner{height:220px}.media-slot.app{height:min(340px,62vw)}
.media-slot:empty::after{content:"";width:34%;height:2px;background:var(--line);box-shadow:0 -12px 0 var(--line),0 12px 0 var(--line)}
.intro-stone{padding:56px 0 44px;background:linear-gradient(180deg,var(--soft),var(--bg))}
.intro-stone .intro-box{max-width:820px}
.intro-mark{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.intro-mark img{height:26px;max-width:90px;object-fit:contain}
.paired-observe{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.observe-panel{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:18px;box-shadow:var(--shadow)}
.observe-panel p{min-height:86px}
.numbered-ribbons{display:grid;gap:10px;margin-top:18px}
.ribbon{display:grid;grid-template-columns:56px 1fr;gap:14px;align-items:start;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:14px}
.ribbon b{display:flex;height:42px;align-items:center;justify-content:center;border-radius:8px;background:var(--deep);color:var(--warm);font-size:15px}
.notes-two{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.note-board{background:var(--paper);border-top:3px solid var(--moss);border-radius:10px;padding:20px;border-left:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.note-board ul{padding-left:18px;margin:0}
.note-board li+li{margin-top:8px}
.shelf-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.shelf-cell{min-height:150px;background:var(--warm);border:1px solid var(--line);border-radius:10px;padding:16px;position:relative}
.shelf-cell::after{content:"";position:absolute;left:14px;right:14px;bottom:12px;height:4px;border-radius:4px;background:var(--deep-bg)}
.letter-sequence{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
.letter-card{padding:16px;border-radius:10px;background:var(--paper);border:1px solid var(--line)}
.letter-card span{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--clay);color:var(--warm);font-weight:800;margin-bottom:10px}
.status-track{display:flex;gap:0;overflow-x:auto;padding:12px 2px 8px;scrollbar-width:thin}
.status-node{min-width:210px;position:relative;padding:0 18px 18px 20px}
.status-node::before{content:"";position:absolute;top:10px;left:0;width:12px;height:12px;border:3px solid var(--warm);background:var(--moss);border-radius:50%;box-shadow:0 0 0 1px var(--moss)}
.status-node::after{content:"";position:absolute;left:12px;right:-6px;top:15px;height:1px;background:var(--light)}
.status-node:last-child::after{display:none}
.status-node b{display:block;color:var(--warm);margin-bottom:5px}
.status-node small{color:#D7D0C5}
.app-stack{display:grid;grid-template-columns:1fr;gap:22px;max-width:760px;margin:0 auto;text-align:center}
.app-icon{width:48px;height:48px;object-fit:contain;margin:0 auto 10px}
.home-tail{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.info-card{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px}
.faq-mini{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.faq-mini article{background:var(--warm);border:1px solid var(--line);border-radius:10px;padding:16px}
.page-hero{padding:44px 0 28px;background:var(--soft);border-bottom:1px solid var(--line)}
.page-hero .hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,.8fr);gap:24px;align-items:center}
.page-hero .hero-copy{max-width:720px}
.longstrips{display:grid;gap:12px}
.longstrip{display:grid;grid-template-columns:64px 1fr;gap:16px;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px}
.longstrip .mark{width:48px;height:48px;border-radius:9px;background:var(--deep);color:var(--warm);display:grid;place-items:center;font-weight:800}
.observe-directory{display:grid;grid-template-columns:220px 1fr;gap:22px;align-items:start}
.observe-index{position:sticky;top:132px;background:var(--deep);color:var(--warm);padding:16px;border-radius:10px}
.observe-index a{display:block;padding:9px 10px;border-radius:7px}.observe-index a:hover{background:rgba(255,255,255,.08)}
.observe-flow{display:grid;gap:14px}.observe-flow article{background:var(--paper);border-left:4px solid var(--moss);padding:18px;border-radius:0 10px 10px 0}
.card-wall{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.card-wall article{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:18px;min-height:220px}.card-wall article:nth-child(even){background:var(--warm)}
.dual-ledger{display:grid;grid-template-columns:1fr 1fr;gap:18px}.ledger{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:20px}.ledger article+article{border-top:1px dashed var(--line);padding-top:14px;margin-top:14px}
.alpha-list{display:grid;gap:14px}.alpha-row{display:grid;grid-template-columns:70px 1fr;gap:18px;align-items:start;padding:18px;background:var(--paper);border:1px solid var(--line);border-radius:10px}.alpha-row .alpha{font-size:26px;font-weight:900;color:var(--clay)}
.timeline{position:relative;display:grid;gap:18px;margin-left:12px}.timeline::before{content:"";position:absolute;left:11px;top:12px;bottom:12px;width:2px;background:var(--light)}.timeline article{position:relative;padding:0 0 0 44px}.timeline article::before{content:"";position:absolute;left:3px;top:7px;width:18px;height:18px;border-radius:50%;background:var(--moss);border:4px solid var(--bg)}.timeline .state{display:inline-block;font-size:12px;padding:3px 9px;border-radius:99px;background:var(--deep);color:var(--warm);margin-bottom:6px}
.memo-list{display:grid;grid-template-columns:1fr 1fr;gap:14px}.memo{background:var(--warm);border:1px solid var(--line);border-radius:10px;padding:18px}.memo ul{margin:0;padding-left:18px}
.method-steps{counter-reset:step;display:grid;gap:16px}.method-steps article{counter-increment:step;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px 18px 18px 70px;position:relative}.method-steps article::before{content:counter(step, cjk-ideographic);position:absolute;left:18px;top:18px;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:var(--clay);color:var(--warm);font-weight:800}
.topic-list{display:grid;gap:12px}.topic-list article{display:grid;grid-template-columns:150px 1fr;gap:18px;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:16px}.topic-list b{color:var(--clay)}
.archive-shelves{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.archive-shelf{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px}.archive-shelf .slat{border-top:5px solid var(--deep-bg);padding-top:14px;margin-top:12px}
.product-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:start}.feature-stack{display:grid;gap:12px}.feature-stack article{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:16px}
.install-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.install-flow article{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:16px}.install-flow span{display:block;color:var(--clay);font-weight:900;margin-bottom:8px}
.policy-sections{display:grid;gap:14px}.policy-sections section{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:20px}.policy-sections section h2{border-bottom:1px solid var(--line);padding-bottom:10px}
.help-board{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.help-board article{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px}
.faq-list{display:grid;gap:12px}.faq-item{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px}.faq-item h2{font-size:16px}.faq-item p:last-child{margin-bottom:0}
.contact-lanes{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.contact-lane{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:20px}.contact-lane a{display:inline-flex;align-items:center;min-height:44px;color:var(--clay);font-weight:800}
.about-manifesto{display:grid;grid-template-columns:.85fr 1.15fr;gap:24px;align-items:start}.manifesto-card{background:var(--deep);color:var(--warm);border-radius:12px;padding:22px;position:sticky;top:132px}.manifesto-card h2{color:var(--warm)}.manifesto-flow{display:grid;gap:14px}.manifesto-flow section{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px}
.site-footer{background:#2A2824;color:#E8E4DC;border-top:1px solid rgba(200,194,182,.28);padding:38px 0 calc(30px + env(safe-area-inset-bottom));font-size:13px}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:24px}.footer-brand-mark{min-height:44px;display:flex;align-items:center}.footer-brand strong,.footer-brand span{display:block}.footer-brand span{color:#C8C2B6;margin-top:2px}
.footer-columns{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.footer-columns h2{color:#F7F3EB;font-size:13px;margin-bottom:10px}.footer-columns a{display:block;color:#E8E4DC;min-height:30px;padding:4px 0}.footer-columns a:hover{color:#fff;text-decoration:underline}
.footer-note{margin:28px 0 10px;padding-top:20px;border-top:1px solid rgba(200,194,182,.2);color:#D8D1C7}.footer-copy{margin:0;color:#BEB7AC}
.page-overlay{position:fixed;inset:0;background:rgba(30,29,26,.48);z-index:95;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.page-overlay.is-active{opacity:1;visibility:visible;pointer-events:auto}
.rock-drawer{position:fixed;left:0;top:0;bottom:0;width:380px;max-width:88vw;background:var(--paper);z-index:100;transform:translateX(-104%);visibility:hidden;pointer-events:none;transition:.24s ease;box-shadow:20px 0 46px rgba(44,42,38,.18)}.rock-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;border-bottom:1px solid var(--line);background:var(--deep-bg)}.drawer-brand{display:flex;align-items:center;gap:10px}.drawer-close,.search-head button{min-width:64px;height:44px;border:1px solid var(--focus);border-radius:9px;background:var(--warm);color:var(--deep)}.drawer-scroll{height:calc(100% - 72px);overflow-y:auto;padding:12px 14px 24px}.drawer-group{padding:12px 0}.drawer-group h2{font-size:13px;color:var(--muted);margin:0 0 8px}.drawer-group a{display:block;padding:11px 10px;border-radius:9px;border:1px solid transparent}.drawer-group a:hover{background:var(--soft);border-color:var(--line)}.drawer-group strong,.drawer-group span{display:block}.drawer-group span{font-size:12px;color:var(--muted);margin-top:2px}
.search-panel{position:fixed;top:78px;left:50%;width:min(760px,calc(100% - 32px));transform:translate(-50%,-18px);z-index:102;background:var(--paper);border:1px solid var(--line);border-radius:0 0 12px 12px;box-shadow:var(--shadow);padding:20px;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.search-panel.is-open{transform:translate(-50%,0);opacity:1;visibility:visible;pointer-events:auto}.search-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:14px}.search-head strong{font-size:18px;color:var(--ink)}.search-head p{font-size:13px;color:var(--muted);margin:2px 0 0}.search-panel label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}.search-panel input{width:100%;height:46px;border:1px solid var(--line);border-radius:9px;background:var(--warm);color:var(--ink);padding:0 12px}.search-presets{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}.search-presets a{height:44px;border-radius:9px;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;background:var(--soft)}.search-presets a:hover{border-color:var(--clay);color:var(--clay)}.search-empty{margin:12px 0 0;color:var(--muted);font-size:13px}
.mobile-bottom{display:none}
@media (max-width:820px){
  .rock-tags{display:none}.site-main{padding-top:78px;padding-bottom:calc(64px + env(safe-area-inset-bottom))}
  .page-section{padding:36px 0}.intro-stone{padding:42px 0 34px}
  .paired-observe,.notes-two,.home-tail,.faq-mini,.dual-ledger,.memo-list,.help-board,.contact-lanes,.archive-shelves,.about-manifesto,.product-grid{grid-template-columns:1fr}
  .shelf-grid{grid-template-columns:1fr 1fr}.letter-sequence{grid-template-columns:1fr}.letter-card{display:grid;grid-template-columns:44px 1fr;gap:12px;align-items:start}.letter-card span{margin:0}
  .page-hero .hero-grid{grid-template-columns:1fr}.page-hero .media-slot{order:2}
  .observe-directory{grid-template-columns:1fr}.observe-index{position:static;display:flex;gap:6px;overflow-x:auto}.observe-index a{white-space:nowrap}
  .card-wall{grid-template-columns:1fr 1fr}.install-flow{grid-template-columns:1fr 1fr}.topic-list article{grid-template-columns:110px 1fr}
  .manifesto-card{position:static}.footer-columns{grid-template-columns:1fr 1fr}
  .mobile-bottom{position:fixed;left:0;right:0;bottom:0;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);z-index:70;background:var(--warm);border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(5,1fr)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-width:0;font-size:12px;color:var(--deep)}.mobile-bottom a.is-active{background:var(--clay);color:var(--warm)}
}
@media (max-width:620px){
  .stone-line-inner,.rock-bar-inner,.section-inner,.footer-inner{width:calc(100% - 32px)}
  .stone-line-inner span{max-width:75%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.brand-link{max-width:42%}.brand-logo{max-width:130px}
  .rock-actions{gap:6px}.drawer-button,.app-button{min-width:68px;padding:0 10px}.page-section{padding:30px 0}
  .paired-observe,.shelf-grid,.card-wall,.archive-shelves,.search-presets,.footer-columns,.install-flow{grid-template-columns:1fr}
  .ribbon,.longstrip,.alpha-row{grid-template-columns:48px 1fr;gap:12px;padding:14px}.ribbon b{height:40px}.topic-list article{grid-template-columns:1fr;gap:6px}.media-slot.short{height:168px}.media-slot.medium{height:190px}.media-slot.banner{height:220px}
  .search-panel{inset:0;width:100%;height:100dvh;transform:none;border:0;border-radius:0;background:var(--deep);color:var(--warm);padding:calc(24px + env(safe-area-inset-top)) 16px 24px}.search-panel.is-open{transform:none}.search-head strong,.search-head p,.search-panel label{color:var(--warm)}.search-head button{background:var(--warm)}.search-panel input{background:#F7F3EB;color:var(--deep)}.search-presets a{background:#4A4640;color:var(--warm);border-color:rgba(247,243,235,.16)}.search-empty{color:#E8E4DC}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}