:root{--bg:#E8E4DC;--deep:#D6D0C6;--paper:#F6F3ED;--soft:#EFEBE3;--ink:#2C2A26;--text:#3A372F;--muted:#6B675E;--faint:#8A8478;--rock:#6B675E;--dark:#3E3B36;--light:#C8C2B6;--warm:#F7F3EB;--moss:#6A7A58;--clay:#A65A3A;--line:rgba(62,59,54,.16);--hotline:rgba(166,90,58,.40);--shadow:0 12px 28px rgba(44,42,38,.08);--max:1080px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);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{font:inherit}img{display:block;max-width:100%;object-fit:contain;object-position:center}.wrap{width:min(calc(100% - 32px),var(--max));margin:0 auto}.skip-link{position:fixed;left:16px;top:-60px;z-index:9999;background:var(--warm);color:var(--dark);padding:8px 12px;border-radius:8px}.skip-link:focus{top:8px}.stone-line{height:22px;position:fixed;z-index:1200;top:0;left:0;right:0;background:var(--dark);color:var(--warm);font-size:12px}.stone-line-inner{height:100%;width:min(calc(100% - 32px),var(--max));margin:auto;display:flex;align-items:center;justify-content:space-between;gap:12px}.text-button{border:0;background:transparent;color:var(--warm);min-width:44px;height:22px;cursor:pointer}.rock-header{position:fixed;z-index:1190;top:22px;left:0;right:0;height:56px;background:var(--deep);border-bottom:1px solid var(--line)}.rock-header-inner{height:100%;width:min(calc(100% - 32px),var(--max));margin:auto;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand-link{display:inline-flex;align-items:center;min-height:44px;max-width:52%}.brand-logo,.drawer-logo,.footer-logo{height:26px;width:auto}.brand-fallback{font-size:16px;font-weight:800;white-space:nowrap}.header-actions{display:flex;align-items:center;gap:8px}.rockbox-button,.app-link,.button-main,.button-sub,.close-button{min-height:44px;border-radius:9px;padding:0 16px;display:inline-flex;align-items:center;justify-content:center;white-space:nowrap;font-size:14px;cursor:pointer}.rockbox-button{border:1px solid var(--hotline);background:var(--warm);color:var(--dark)}.app-link,.button-main{border:1px solid transparent;background:linear-gradient(135deg,#8A8478 0%,#6B675E 55%,#3E3B36 100%);color:var(--warm)}.button-sub{border:1px solid var(--clay);background:var(--warm);color:var(--dark)}.close-button{border:1px solid var(--line);background:var(--warm);color:var(--dark)}a:hover,button:hover{filter:brightness(.97)}a:focus-visible,button:focus-visible{outline:3px solid rgba(166,90,58,.32);outline-offset:2px}.rock-tabs{position:fixed;z-index:1180;top:78px;left:0;right:0;height:38px;background:var(--warm);border-bottom:1px solid var(--line)}.rock-tabs-inner{height:100%;display:flex;align-items:center;justify-content:center;gap:8px}.rock-tabs a{height:30px;padding:0 18px;border-radius:8px;display:inline-flex;align-items:center;font-size:13px}.rock-tabs a.is-active{background:var(--dark);color:var(--warm)}.site-main{padding-top:116px;min-height:70vh}.page-hero{padding:46px 0 24px}.compact-hero{background:linear-gradient(180deg,var(--deep),transparent)}.narrow-copy{max-width:760px}.eyebrow{font-size:12px;letter-spacing:.12em;color:var(--muted);font-weight:800}.page-hero h1,.intro-block h1{font-size:24px;line-height:1.3;margin:8px 0 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var(--line);border-radius:10px;display:flex;align-items:center;justify-content:center;overflow:hidden}.media-slot:empty::after{content:"";width:46px;height:4px;border-radius:99px;background:var(--light)}.slot-168{height:168px}.slot-190{height:190px}.slot-220{height:220px}.slot-app{max-height:340px;min-height:220px}.slot-app img{max-height:330px}.paired-feature{display:grid;grid-template-columns:1fr 1fr;gap:18px}.feature-pane{background:var(--paper);border:1px solid var(--line);border-radius:11px;padding:16px;box-shadow:var(--shadow)}.feature-pane .media-slot{margin-bottom:14px}.number-bars{display:grid;gap:10px}.number-bar{display:grid;grid-template-columns:54px 1fr;gap:14px;padding:16px;background:var(--paper);border:1px solid var(--line);border-radius:10px}.number-bar .cn-num{font-weight:900;color:var(--clay);font-size:18px}.note-cols{display:grid;grid-template-columns:1fr 1fr;gap:18px}.note-card{background:var(--warm);border-left:4px solid var(--moss);padding:18px;border-radius:8px}.shelf-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.shelf-cell{background:var(--paper);border:1px solid var(--line);border-bottom:4px solid var(--light);border-radius:10px;padding:16px;min-height:140px}.letter-list{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.letter-item{background:var(--deep);border:1px solid var(--line);border-radius:10px;padding:14px}.letter-item b{display:block;color:var(--clay);margin-bottom:7px}.timeline-x{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;position:relative}.timeline-x:before{content:"";position:absolute;left:8%;right:8%;top:22px;height:2px;background:var(--light)}.time-node{position:relative;background:var(--warm);border:1px solid var(--line);border-radius:10px;padding:44px 16px 16px}.time-node:before{content:"";position:absolute;width:14px;height:14px;border-radius:50%;background:var(--clay);top:15px;left:18px;box-shadow:0 0 0 5px var(--warm)}.app-stack{max-width:760px;margin:auto}.app-stack .media-slot{margin-top:18px}.app-icons{display:flex;align-items:center;gap:12px;margin-top:12px}.app-icons img{width:48px;height:48px}.read-points{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.read-point{background:var(--paper);border:1px solid var(--line);padding:16px;border-radius:10px}.faq-mini{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.faq-mini article{background:var(--warm);border:1px solid var(--line);padding:16px;border-radius:10px}.content-stack{display:grid;gap:14px}.content-card{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px}.content-card p:last-child{margin-bottom:0}.content-card strong{color:var(--dark)}.observation-list{counter-reset:obs;display:grid;gap:12px}.observation-item{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px;display:grid;grid-template-columns:110px 1fr;gap:16px}.observation-item .label{font-weight:900;color:var(--moss)}.card-wall{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.wall-card{background:var(--paper);border:1px solid var(--line);border-radius:11px;padding:18px;min-height:190px}.wall-card:nth-child(3n){background:var(--deep)}.wall-card:nth-child(3n) h2,.wall-card:nth-child(3n) p{color:var(--warm)}.memo-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.memo-column{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px}.memo-column section+section{border-top:1px solid var(--line);margin-top:16px;padding-top:16px}.letter-flow{display:grid;gap:12px}.letter-row{display:grid;grid-template-columns:70px 1fr;gap:16px;align-items:start;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:16px}.letter-row .mark{background:var(--dark);color:var(--warm);border-radius:8px;min-height:54px;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:900}.status-track{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.status-box{background:var(--warm);border:1px solid var(--line);border-radius:10px;padding:16px}.status{display:inline-flex;padding:4px 9px;border-radius:999px;background:var(--deep);font-size:12px;color:var(--dark);font-weight:800}.checklist{display:grid;gap:10px}.checkline{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:15px 16px 15px 46px;position:relative}.checkline:before{content:"✓";position:absolute;left:16px;top:15px;width:20px;height:20px;border-radius:50%;background:var(--moss);color:var(--warm);display:flex;align-items:center;justify-content:center;font-size:12px}.method-steps{display:grid;gap:14px}.method-step{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px}.method-step h2{margin-top:0}.topic-list{display:grid;gap:12px}.topic-row{display:flex;gap:16px;align-items:flex-start;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:16px}.topic-row .topic-mark{flex:0 0 110px;color:var(--clay);font-weight:900}.shelf-layout{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.shelf-layout article{background:var(--paper);border:1px solid var(--line);border-bottom:5px solid var(--rock);border-radius:10px;padding:16px;min-height:200px}.product-block{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:20px}.product-features{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:14px}.product-feature{background:var(--soft);border:1px solid var(--line);padding:15px;border-radius:10px}.policy-sections{display:grid;gap:14px}.policy-sections section{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px}.policy-sections 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@media(max-width:420px){.stone-line-inner span{max-width:72%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.header-actions{gap:6px}.rockbox-button,.app-link{padding:0 10px}.shelf-grid,.footer-grid{grid-template-columns:1fr}.number-bar{grid-template-columns:40px 1fr}.wrap{width:calc(100% - 32px)}}