/* Hallmark · macrostructure: Letter + eleven chapters · theme: LegacyOS Sea
 * pre-emit critique: P4 H4 E4 S5 R4 V4 */
:root {
  --bg: var(--color-sea); --bg-2: var(--color-paper); --surface: var(--color-paper);
  --ink: var(--color-ink); --muted: var(--color-muted); --line: var(--color-rule);
  --bronze: var(--color-accent); --bronze-2: var(--color-accent); --sea: var(--color-sea-deep);
  --paper: var(--color-paper); --paper-ink: var(--color-ink); --danger: var(--color-error);
  --ok: var(--color-success); --warn: var(--color-warning);
  --shadow: 0 24px 60px var(--color-shadow); --ease: var(--ease-out);
  --display: var(--font-display); --body: var(--font-body); --mono: var(--font-body);
  --pad-x: clamp(24px,6vw,112px); --pad-y: clamp(100px,12vh,148px);
}

    
    *{box-sizing:border-box}
    html,body{width:100%;height:100%;margin:0;overflow-x:clip;background:var(--bg);color:var(--ink)}
    body{
      font-family:var(--body);
      font-synthesis:none;
      -webkit-font-smoothing:antialiased;
      text-rendering:optimizeLegibility;
    }
    button,a{font:inherit;color:inherit}
    button{cursor:pointer;background:none;border:0;padding:0}
    a{text-decoration:none}
    ::selection{background:var(--color-sea-deep)}

    .deck{position:relative;z-index:2;width:100%;height:100%}
    .slide{
      position:absolute;inset:0;display:grid;place-items:center;
      padding:var(--pad-y) var(--pad-x) clamp(72px,7vh,96px);
      opacity:0;visibility:hidden;pointer-events:none;
      transform:translate3d(0,28px,0);
      transition:opacity .55s var(--ease),transform .7s var(--ease),visibility 0s linear .7s;
      overflow:hidden;
    }
    .slide.active{
      opacity:1;visibility:visible;pointer-events:auto;transform:none;
      transition:opacity .55s var(--ease),transform .7s var(--ease),visibility 0s;
    }
    .slide.exit-up{opacity:0;transform:translate3d(0,-24px,0)}
    .slide.exit-down{opacity:0;transform:translate3d(0,24px,0)}
    .slide-inner{width:min(1480px,100%);height:min(860px,100%);position:relative;display:flex;flex-direction:column;justify-content:center}
    .slide-inner.scrollable{overflow:auto;overscroll-behavior:contain}

    .reveal{opacity:0;transform:translateY(18px);transition:opacity .55s var(--ease),transform .65s var(--ease);transition-delay:min(var(--d,0ms),220ms)}
    .active .reveal{opacity:1;transform:none}
    .reveal-left{opacity:0;transform:translateX(-18px);transition:opacity .55s var(--ease),transform .65s var(--ease);transition-delay:min(var(--d,0ms),220ms)}
    .active .reveal-left{opacity:1;transform:none}
    .reveal-right{opacity:0;transform:translateX(18px);transition:opacity .55s var(--ease),transform .65s var(--ease);transition-delay:min(var(--d,0ms),220ms)}
    .active .reveal-right{opacity:1;transform:none}

    .topbar{
      position:fixed;z-index:30;left:0;right:0;top:0;height:64px;
      padding:0 max(28px,env(safe-area-inset-left));
      display:flex;align-items:center;gap:18px;
      background:linear-gradient(180deg,var(--color-sea),transparent);
      pointer-events:none;
    }
    .topbar>*{pointer-events:auto}
    .brand{display:flex;align-items:baseline;gap:12px;min-width:220px}
    .brand b{font-family:var(--display);font-size:22px;font-weight:500;letter-spacing:.02em;line-height:1}
    .brand span{font-family:var(--mono);font-size:10px;letter-spacing:.18em;color:var(--muted);text-transform:none}
    .chapter{margin-left:auto;color:var(--muted);font-size:11px;letter-spacing:.04em;white-space:nowrap;max-width:38vw;overflow:hidden;text-overflow:ellipsis}
    .top-actions{display:flex;gap:4px}
    .icon-btn{
      width:34px;height:34px;border:1px solid transparent;color:var(--muted);
      display:grid;place-items:center;transition:.2s var(--ease);
    }
    .icon-btn:hover,.icon-btn.active{color:var(--bronze);border-color:var(--line)}
    .icon-btn svg{width:15px;height:15px}

    .progress-rail{position:fixed;z-index:35;left:max(28px,env(safe-area-inset-left));right:max(28px,env(safe-area-inset-right));bottom:22px;height:36px;display:flex;align-items:center;gap:16px;pointer-events:none}
    .progress-rail>*{pointer-events:auto}
    .count{font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--muted);min-width:52px}
    .count b{font-size:13px;color:var(--ink)}
    .track{height:1px;flex:1;background:var(--line);position:relative}
    .track-fill{position:absolute;left:0;top:0;height:100%;width:0;background:var(--bronze);transition:width .7s var(--ease)}
    .track-dot{position:absolute;top:50%;width:7px;height:7px;background:var(--ink);transform:translate(-50%,-50%);left:0;transition:left .7s var(--ease)}
    .nav-controls{display:flex;gap:6px}
    .nav-btn{width:34px;height:34px;border:1px solid var(--line);display:grid;place-items:center;color:var(--ink);transition:.2s var(--ease)}
    .nav-btn:hover{border-color:var(--bronze);color:var(--bronze)}
    .nav-btn:disabled{opacity:.25;cursor:default}
    .nav-btn svg{width:15px;height:15px}
    .auto-timer{position:fixed;z-index:34;left:0;right:0;bottom:0;height:2px;transform-origin:left;background:var(--bronze);opacity:0;transform:scaleX(0)}
    .auto-timer.running{opacity:.85;animation:autoTimer 8s linear forwards}
    @keyframes autoTimer{to{transform:scaleX(1)}}

    .eyebrow{color:var(--bronze);font-family:var(--display);font-style:normal;font-size:18px;font-weight:400}
    .kicker{font-size:11px;letter-spacing:.14em;text-transform:none;color:var(--muted);font-weight:600}
    h1,h2,h3,p{margin-top:0}
    .num{font-family:var(--mono);font-weight:500;letter-spacing:0;font-style:normal}
    .display{font-family:var(--display);font-size:clamp(46px,5.6vw,92px);font-weight:600;line-height:1.04;letter-spacing:-.03em;margin:18px 0 22px;max-width:1180px;text-wrap:pretty;font-feature-settings:"lnum","tnum"}
    .display .accent,.title .accent{color:var(--bronze);font-style:normal}
    .title{font-family:var(--display);font-size:clamp(34px,4.1vw,64px);font-weight:600;line-height:1.08;letter-spacing:-.025em;margin:14px 0 16px;max-width:1180px;text-wrap:pretty;font-feature-settings:"lnum","tnum"}
    .title .gold{color:var(--bronze);font-style:normal}
    .lead{font-size:clamp(16px,1.45vw,22px);line-height:1.55;color:var(--muted);max-width:860px;margin-bottom:0;text-wrap:pretty}
    .micro{font-size:11px;color:var(--muted);line-height:1.55}
    .panel{background:var(--surface);border:1px solid var(--line)}
    .verdict{margin-top:22px;padding-top:18px;border-top:1px solid var(--color-rule);font-family:var(--display);font-size:clamp(18px,1.6vw,24px);line-height:1.4;color:var(--ink)}
    .quote{margin-top:22px;padding-top:16px;border-top:1px solid var(--line);font-family:var(--display);font-size:20px;line-height:1.45;color:var(--ink)}

    .cover-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(320px,.72fr);gap:clamp(32px,5vw,80px);align-items:center}
    .cover-sub{margin-top:28px;color:var(--muted);font-size:14px}
    .cover-metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin-top:36px;max-width:720px;border-top:1px solid var(--line)}
    .cover-metric{padding:16px 18px 0 0}
    .cover-metric strong{display:block;font-family:var(--mono);font-size:22px;font-weight:500;line-height:1.1;letter-spacing:.02em}
    .cover-metric span{display:block;margin-top:6px;font-size:11px;color:var(--muted);line-height:1.4}
    .register{border:1px solid var(--line);padding:28px 28px 22px;background:var(--surface)}
    .register-head{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:none;color:var(--bronze);margin-bottom:22px}
    .register-list{list-style:none;margin:0;padding:0;display:grid;gap:0}
    .register-list li{display:grid;grid-template-columns:42px 1fr;gap:12px;align-items:baseline;padding:14px 0;border-top:1px solid var(--line);font-size:15px}
    .register-list i{font-family:var(--mono);font-style:normal;font-size:11px;color:var(--bronze)}

    .split{display:grid;grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:clamp(34px,5vw,88px);align-items:center}
    .problem-stack{position:relative;min-height:540px;display:grid;place-items:center}
    .paper-card{position:absolute;width:min(390px,78%);min-height:230px;padding:28px 26px;background:var(--paper);color:var(--paper-ink);box-shadow:var(--shadow);transform-origin:center}
    .paper-card:nth-child(1){transform:translate(-36px,-64px) rotate(-7deg);opacity:.4}
    .paper-card:nth-child(2){transform:translate(28px,-14px) rotate(5deg);opacity:.62}
    .paper-card.main{transform:translate(0,52px) rotate(-1deg);z-index:3}
    .paper-card .doc-top{display:flex;justify-content:space-between;align-items:baseline;border-bottom:1px solid var(--color-rule);padding-bottom:12px;margin-bottom:18px;font-family:var(--display)}
    .paper-card .doc-top b{font-size:15px;font-weight:600;letter-spacing:.04em}
    .paper-card .doc-top span{font-family:var(--mono);font-size:9px;letter-spacing:.12em}
    .doc-line{height:6px;background:var(--color-rule-soft);margin:10px 0}
    .doc-line.w70{width:70%}.doc-line.w88{width:88%}.doc-line.w55{width:55%}
    .download-stamp{position:absolute;right:22px;bottom:22px;border:1.5px solid var(--color-error);color:var(--color-error);padding:6px 9px;font-family:var(--mono);font-size:10px;letter-spacing:.12em;transform:rotate(-8deg)}
    .failure-marker{position:absolute;z-index:6;padding:8px 0;color:var(--danger);font-family:var(--display);font-style:normal;font-size:15px}
    .failure-marker.f1{left:2%;top:16%}.failure-marker.f2{right:0;top:44%}.failure-marker.f3{left:0;bottom:6%}
    .problem-list{display:grid;gap:0;margin-top:28px}
    .problem-item{display:grid;grid-template-columns:48px minmax(0,1fr);gap:14px;align-items:start;padding:16px 0;border-top:1px solid var(--line)}
    .problem-item .num{font-family:var(--mono);font-size:11px;color:var(--danger);padding-top:4px}
    .problem-item b{display:block;font-size:17px;font-weight:600;margin-bottom:4px}
    .problem-item span{display:block;color:var(--muted);font-size:13px;line-height:1.5}

    .horizon{position:relative;margin-top:44px;height:300px}
    .horizon-line{position:absolute;left:2%;right:2%;top:50%;height:1px;background:linear-gradient(90deg,transparent,var(--bronze),transparent);transform:scaleX(0);transform-origin:left;transition:transform 1.8s .4s var(--ease)}
    .active .horizon-line{transform:scaleX(1)}
    .life-point{position:absolute;top:calc(50% - 4px);width:8px;height:8px;background:var(--bronze);opacity:0;transform:scale(.4);transition:.45s var(--ease);transition-delay:min(var(--d),280ms)}
    .active .life-point{opacity:1;transform:scale(1)}
    .life-card{position:absolute;width:210px;padding:0;opacity:0;transform:translateY(var(--y,12px));transition:.65s var(--ease);transition-delay:min(var(--d),280ms)}
    .active .life-card{opacity:1;transform:none}
    .life-card.top{bottom:calc(50% + 28px)}.life-card.bottom{top:calc(50% + 26px)}
    .life-card b{display:block;font-family:var(--display);font-size:16px;font-weight:500}
    .life-card span{display:block;color:var(--muted);font-size:11px;line-height:1.45;margin-top:4px}
    .life-label{display:none}
    .insight-metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin-top:18px;border-top:1px solid var(--line)}
    .big-stat{padding:18px 22px 0 0}
    .big-stat strong{display:block;font-family:var(--mono);font-size:clamp(26px,2.4vw,40px);font-weight:500;line-height:1.1;letter-spacing:.01em}
    .big-stat span{display:block;margin-top:7px;color:var(--muted);font-size:12px;line-height:1.45}
    .big-stat strong.teal,.big-stat strong.gold{color:var(--bronze)}

    .solution-grid{display:grid;grid-template-columns:minmax(0,.86fr) minmax(480px,1.14fr);gap:clamp(32px,5vw,80px);align-items:center}
    .position-box{margin-top:28px;padding-top:18px;border-top:1px solid var(--line);font-size:15px;line-height:1.65;color:var(--ink)}
    .position-box b{color:var(--bronze);font-weight:600}
    .trust-bar{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;margin-top:28px}
    .trust-chip{padding:12px 14px 0 0;border-top:1px solid var(--line);font-size:11px;color:var(--muted)}
    .trust-chip b{display:block;color:var(--ink);font-size:12px;margin-bottom:4px;font-weight:600}
    .protocol{margin:0;padding:28px 32px;border:1px solid var(--line);background:var(--surface)}
    .protocol-head{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:none;color:var(--bronze);margin-bottom:8px}
    .protocol-title{font-family:var(--display);font-size:28px;margin:0 0 22px}
    .protocol ol{list-style:none;margin:0;padding:0}
    .protocol li{display:grid;grid-template-columns:40px 1fr;gap:14px;padding:13px 0;border-top:1px solid var(--line)}
    .protocol i{font-family:var(--mono);font-style:normal;font-size:11px;color:var(--bronze);padding-top:3px}
    .protocol b{display:block;font-size:15px;font-weight:600}
    .protocol span{display:block;margin-top:3px;font-size:12px;color:var(--muted);line-height:1.4}

    .journey-stage{position:relative;margin-top:40px;padding:40px 8px 8px}
    .journey-line{position:absolute;left:4%;right:4%;top:68px;height:1px;background:var(--line);overflow:hidden}
    .journey-line::after{content:"";position:absolute;inset:0;background:var(--bronze);transform:translateX(-100%)}
    .active .journey-line::after{animation:journeyFill 3.6s .5s var(--ease) forwards}
    @keyframes journeyFill{to{transform:translateX(0)}}
    .journey-steps{display:grid;grid-template-columns:repeat(8,1fr);position:relative;z-index:2;gap:8px}
    .journey-step{text-align:left;opacity:0;transform:translateY(14px);transition:.55s var(--ease);transition-delay:min(var(--d),280ms)}
    .active .journey-step{opacity:1;transform:none}
    .step-icon{font-family:var(--mono);font-size:11px;color:var(--bronze);margin-bottom:12px}
    .journey-step h3{font-size:14px;margin:0 0 6px;font-weight:600;line-height:1.3}
    .journey-step p{font-size:11px;color:var(--muted);line-height:1.45;margin:0}
    .completion-state{margin-top:36px;padding-top:20px;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr auto;gap:18px;align-items:end}
    .completion-state b{display:block;font-family:var(--display);font-size:20px;font-weight:500}
    .completion-state p{margin:6px 0 0;color:var(--muted);font-size:13px}
    .true-state{font-family:var(--display);font-style:normal;font-size:18px;color:var(--ok)}

    .triage-grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(500px,1.1fr);gap:clamp(30px,5vw,72px);align-items:center}
    .case-switch{display:flex;flex-wrap:wrap;gap:8px;margin-top:26px}
    .case-btn{border:1px solid var(--line);padding:8px 12px;color:var(--muted);font-size:12px;transition:.2s var(--ease)}
    .case-btn:hover,.case-btn.active{border-color:var(--bronze);color:var(--ink)}
    .guardrails{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;margin-top:22px}
    .guardrail{padding:12px 16px 12px 0;border-top:1px solid var(--line);font-size:12px;color:var(--muted);line-height:1.45}
    .guardrail::before{content:"— ";color:var(--bronze)}
    .decision-tree{position:relative;padding:28px 28px 22px;min-height:580px;display:flex;flex-direction:column;justify-content:center;gap:18px}
    .tree-root{font-family:var(--display);font-size:22px;line-height:1.25}
    .tree-root span{display:block;margin-top:6px;color:var(--muted);font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:none}
    .risk-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .risk-card{padding:18px 4px 0 0;border-top:2px solid var(--line);min-height:220px;opacity:.34;transition:.35s var(--ease)}
    .risk-card.selected{opacity:1}
    .risk-card.red{border-top-color:var(--danger)}
    .risk-card.amber{border-top-color:var(--warn)}
    .risk-card.green{border-top-color:var(--ok)}
    .risk-letter{font-family:var(--display);font-size:28px;margin-bottom:10px}
    .risk-card.red .risk-letter{color:var(--danger)}
    .risk-card.amber .risk-letter{color:var(--warn)}
    .risk-card.green .risk-letter{color:var(--ok)}
    .risk-card h3{font-size:15px;margin:0 0 8px}
    .risk-card p{font-size:12px;line-height:1.5;color:var(--muted);margin:0}
    .risk-card ul{padding-left:16px;margin:12px 0 0;color:var(--ink);font-size:11px;line-height:1.55}
    .case-result{margin-top:4px;padding-top:14px;border-top:1px solid var(--line);font-size:13px;color:var(--ink);line-height:1.5;min-height:48px}
    .case-result b{color:var(--bronze)}

    .architecture{margin-top:28px;position:relative}
    .arch-row{display:grid;grid-template-columns:repeat(7,1fr);gap:12px;position:relative;z-index:2}
    .arch-line{position:absolute;left:6%;right:6%;top:18px;height:1px;background:var(--line);z-index:1}
    .arch-node{min-height:auto;padding:0;text-align:left;opacity:0;transform:translateY(12px);transition:.5s var(--ease);transition-delay:min(var(--d),280ms)}
    .active .arch-node{opacity:1;transform:none}
    .arch-node i{display:block;font-family:var(--mono);font-style:normal;font-size:10px;color:var(--bronze);margin-bottom:28px}
    .arch-node b{display:block;font-size:13px;line-height:1.3;font-weight:600}
    .arch-node span{display:block;font-size:11px;color:var(--muted);line-height:1.4;margin-top:5px}
    .graph-zone{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;margin-top:28px;padding-top:22px;border-top:1px solid var(--line)}
    .graph-card h3{font-family:var(--display);font-size:22px;font-weight:500;margin:0 0 16px}
    .entity-cloud{display:flex;flex-wrap:wrap;gap:8px 18px;align-content:flex-start}
    .entity{font-size:13px;color:var(--ink);padding:0}
    .entity-core{width:100%;margin-top:8px;padding-top:12px;border-top:1px solid var(--line);font-family:var(--display);font-style:normal;font-size:16px;color:var(--bronze)}
    .moat-list{display:grid;gap:0}
    .moat{padding:12px 0;border-top:1px solid var(--line);display:grid;grid-template-columns:36px 1fr;gap:12px;align-items:start}
    .moat i{font-family:var(--mono);font-style:normal;font-size:11px;color:var(--bronze);padding-top:2px}
    .moat b{display:block;font-size:13px}
    .moat span{display:block;font-size:11px;color:var(--muted);margin-top:3px;line-height:1.35}

    .slide[id="07"] .title{font-size:clamp(32px,3.5vw,56px);margin:10px 0 10px}
    .slide[id="07"] .lead{font-size:clamp(15px,1.2vw,18px)}
    .slide[id="07"] .architecture{margin-top:18px}
    .slide[id="07"] .graph-zone{margin-top:18px}

    .business-grid{display:grid;grid-template-columns:minmax(0,.92fr) minmax(460px,1.08fr);gap:clamp(36px,5vw,84px);align-items:center}
    .revenue-stack{display:grid;gap:0;margin-top:26px}
    .rev-layer{padding:13px 0;border-top:1px solid var(--line);display:grid;grid-template-columns:140px 1fr auto;gap:12px;align-items:baseline}
    .rev-layer b{font-size:13px}
    .rev-layer span{font-size:12px;color:var(--muted)}
    .rev-layer strong{font-size:13px;color:var(--bronze);white-space:nowrap}
    .cycle{position:relative;min-height:520px;display:grid;grid-template-columns:1fr 160px 1fr;grid-template-rows:1fr 140px 1fr;gap:12px;align-items:center}
    .cycle-core{grid-column:2;grid-row:2;display:grid;place-items:center;text-align:center;border:1px solid var(--bronze);height:140px}
    .cycle-core b{font-family:var(--display);font-size:26px;font-weight:500}
    .cycle-core span{display:block;margin-top:6px;font-size:11px;color:var(--muted)}
    .fly-node{padding:4px 8px}
    .fly-node b{display:block;font-size:15px;font-weight:600}
    .fly-node span{display:block;margin-top:4px;font-size:12px;color:var(--muted);line-height:1.4}
    .fly-node.f1{grid-column:1;grid-row:1;align-self:end}
    .fly-node.f2{grid-column:3;grid-row:1;align-self:end;text-align:right}
    .fly-node.f3{grid-column:3;grid-row:3;align-self:start;text-align:right}
    .fly-node.f4{grid-column:1;grid-row:3;align-self:start}
    .econ-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin-top:18px}
    .econ{padding:12px 12px 0 0;border-top:1px solid var(--line)}
    .econ b{display:block;color:var(--bronze);font-family:var(--mono);font-size:16px;font-weight:500}
    .econ span{display:block;margin-top:4px;color:var(--muted);font-size:11px;line-height:1.35}

    .gtm-layout{display:grid;grid-template-columns:minmax(0,.82fr) minmax(500px,1.18fr);gap:clamp(36px,5vw,80px);align-items:center}
    .beachheads{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;margin-top:24px}
    .beachhead{padding:16px 16px 16px 0;border-top:1px solid var(--line)}
    .beachhead b{display:block;font-size:14px}
    .beachhead span{display:block;font-size:12px;color:var(--muted);line-height:1.45;margin-top:5px}
    .channel-stage{padding:8px 0;min-height:520px;display:flex;flex-direction:column;justify-content:center}
    .channel-row{display:flex;justify-content:space-between;gap:12px;margin-bottom:28px;padding-bottom:16px;border-bottom:1px solid var(--line)}
    .channel{flex:1;font-size:13px;color:var(--ink)}
    .channel-pipe{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
    .pipe-step{padding:0;font-size:12px;color:var(--muted);opacity:0;transform:translateY(10px);transition:.5s var(--ease);transition-delay:min(var(--d),280ms)}
    .active .pipe-step{opacity:1;transform:none}
    .pipe-step b{display:block;color:var(--bronze);font-family:var(--mono);font-size:11px;margin-bottom:6px}
    .pilot-box{margin-top:32px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;border-top:1px solid var(--line)}
    .pilot{padding:16px 12px 0 0}
    .pilot strong{display:block;font-family:var(--mono);font-size:26px;font-weight:500;color:var(--bronze)}
    .pilot span{display:block;margin-top:4px;color:var(--muted);font-size:11px}
    .channel-reason{margin-top:18px;font-size:12px;color:var(--muted);line-height:1.5}

    .roadmap{position:relative;margin-top:40px}
    .road-line{position:absolute;left:0;right:0;top:18px;height:1px;background:var(--line)}
    .road-line::after{content:"";position:absolute;left:0;top:0;height:100%;width:0;background:var(--bronze);transition:width 3.2s .5s var(--ease)}
    .active .road-line::after{width:100%}
    .road-phases{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:22px;position:relative;z-index:2}
    .phase{opacity:0;transform:translateY(14px);transition:.6s var(--ease);transition-delay:min(var(--d),280ms)}
    .active .phase{opacity:1;transform:none}
    .phase-dot{width:9px;height:9px;margin:14px 0 20px;background:var(--bg);border:1px solid var(--bronze)}
    .phase-card .weeks{font-family:var(--mono);font-size:10px;color:var(--bronze);letter-spacing:.14em;text-transform:none}
    .phase-card h3{font-family:var(--display);font-size:22px;font-weight:500;margin:8px 0 12px}
    .phase-card ul{margin:0;padding-left:16px;color:var(--muted);font-size:13px;line-height:1.6}
    .gates{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;margin-top:28px;border-top:1px solid var(--line)}
    .gate{padding:14px 16px 0 0;font-size:12px;color:var(--muted)}
    .gate b{display:block;font-size:13px;color:var(--ink);margin-bottom:4px}
    .gate.zero b{color:var(--ok)}

    .close-slide{text-align:center;align-items:center}
    .go-word{font-family:var(--display);font-style:normal;font-size:22px;color:var(--bronze);margin-bottom:12px}
    .close-title{font-family:var(--display);font-size:clamp(42px,5.4vw,84px);font-weight:600;line-height:1.06;letter-spacing:-.03em;margin:0 auto 20px;max-width:1100px}
    .close-title .accent{color:var(--bronze);font-style:normal}
    .close-lead{max-width:760px;margin:0 auto;color:var(--muted);font-size:clamp(16px,1.5vw,22px);line-height:1.55}
    .ask-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;max-width:860px;margin:40px auto 0;border-top:1px solid var(--line)}
    .ask{padding:18px 12px 0}
    .ask strong{display:block;font-family:var(--mono);font-size:30px;font-weight:500;color:var(--bronze)}
    .ask span{display:block;margin-top:6px;color:var(--muted);font-size:12px}
    .closing-line{margin:32px auto 0;padding-top:20px;border-top:1px solid var(--line);max-width:820px;font-family:var(--display);font-size:22px;line-height:1.5}
    .closing-actions{display:flex;justify-content:center;gap:18px;margin-top:28px}
    .cta{border-bottom:1px solid var(--bronze);padding:4px 0;font-size:13px;letter-spacing:.04em}
    .cta:hover{color:var(--bronze)}
    .cta.secondary{border-color:var(--line);color:var(--muted)}

    .overlay{position:fixed;inset:0;z-index:80;background:var(--color-shadow);opacity:0;visibility:hidden;transition:.3s ease;display:grid;place-items:center;padding:28px}
    .overlay.open{opacity:1;visibility:visible}
    .drawer{width:min(840px,100%);max-height:min(760px,90vh);overflow:auto;padding:32px;border:1px solid var(--line);background:var(--bg-2);box-shadow:var(--shadow)}
    .drawer-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:20px}
    .drawer-head h2{font-family:var(--display);font-size:28px;font-weight:500;margin:0}
    .drawer-head p{font-size:12px;color:var(--muted);margin:6px 0 0}
    .close-overlay{border:1px solid var(--line);width:32px;height:32px;color:var(--ink)}
    .source-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
    .source-link{display:block;padding:12px 0;border-top:1px solid var(--line);font-size:12px;color:var(--muted);line-height:1.45}
    .source-link:hover{color:var(--bronze)}
    .disclaimer{margin-top:18px;padding-top:14px;border-top:1px solid var(--warn);font-size:11px;color:var(--muted);line-height:1.55}
    .help-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0}
    .key-row{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}
    .keys{display:flex;gap:4px}
    .key{min-width:24px;height:24px;padding:0 6px;display:grid;place-items:center;border:1px solid var(--line);font-family:var(--mono);font-size:10px;color:var(--ink)}
    .notes{position:fixed;z-index:60;left:50%;bottom:68px;transform:translate(-50%,12px);width:min(840px,calc(100% - 44px));padding:14px 16px;border:1px solid var(--line);background:var(--bg-2);color:var(--ink);font-size:13px;line-height:1.55;opacity:0;visibility:hidden;transition:.25s ease}
    .notes.open{opacity:1;visibility:visible;transform:translate(-50%,0)}
    .notes b{color:var(--bronze);margin-right:8px;font-family:var(--display);font-weight:500}

    .dot-nav{position:fixed;z-index:40;right:22px;top:50%;transform:translateY(-50%);display:grid;gap:10px}
    .dot-nav button{width:14px;height:1px;border:0;background:var(--line);padding:0;transition:.25s ease;position:relative}
    .dot-nav button::before{content:attr(aria-label);position:absolute;right:18px;top:50%;transform:translateY(-50%) translateX(6px);white-space:nowrap;padding:5px 8px;background:var(--bg-2);border:1px solid var(--line);font-size:10px;color:var(--muted);opacity:0;pointer-events:none;transition:.2s ease}
    .dot-nav button:hover::before{opacity:1;transform:translateY(-50%) translateX(0)}
    .dot-nav button.active{background:var(--bronze);transform:scaleX(1.4);transform-origin:right}

    .swipe-hint{position:fixed;z-index:20;left:50%;bottom:68px;transform:translateX(-50%);font-family:var(--mono);font-size:9px;color:var(--muted);letter-spacing:.14em;text-transform:none;animation:hintFade 5s 1.5s forwards}
    @keyframes hintFade{0%,65%{opacity:1}100%{opacity:0;visibility:hidden}}

    @media (max-width:1180px){
      .cover-grid,.split,.solution-grid,.triage-grid,.business-grid,.gtm-layout{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:32px}
      .display{font-size:clamp(42px,6.4vw,72px)}
      .journey-step p{display:none}
      .arch-node b{font-size:12px}
    }
    @media (max-width:820px){
      :root{--pad-x:22px;--pad-y:78px}
      .chapter,.dot-nav{display:none}
      .slide{overflow:auto;overscroll-behavior:contain;display:block}
      .slide-inner{height:auto;min-height:100%;padding:12px 0 32px}
      .cover-grid,.split,.solution-grid,.triage-grid,.business-grid,.gtm-layout,.graph-zone{grid-template-columns:1fr}
      .cover-metrics,.insight-metrics,.trust-bar,.ask-grid,.econ-grid,.beachheads,.gates,.pilot-box{grid-template-columns:1fr}
      .problem-stack{order:2;min-height:380px}
      .horizon{height:480px}.horizon-line{left:50%;right:auto;top:3%;bottom:3%;width:1px;height:auto}
      .life-point{left:calc(50% - 4px)!important;top:var(--mobile-y)!important}
      .life-card{width:44%;top:var(--mobile-y)!important;bottom:auto!important}
      .life-card:nth-of-type(odd){left:0!important}.life-card:nth-of-type(even){left:56%!important}
      .life-label{display:none}
      .journey-stage{overflow-x:auto}.journey-steps{min-width:860px}
      .risk-row{grid-template-columns:1fr}.risk-card{min-height:auto}
      .arch-row{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.arch-line{display:none}.arch-node i{margin-bottom:8px}
      .cycle{min-height:auto;grid-template-columns:1fr;grid-template-rows:auto}
      .cycle-core,.fly-node{grid-column:1;grid-row:auto;text-align:left;height:auto;padding:16px 0}
      .channel-pipe{grid-template-columns:1fr}
      .roadmap{overflow-x:auto}.road-phases{min-width:880px}
      .source-grid,.help-grid{grid-template-columns:1fr}
      .rev-layer{grid-template-columns:1fr auto}.rev-layer span{grid-column:1/-1}
    }
    @media (max-height:760px) and (min-width:821px){
      :root{--pad-y:64px}
      .display{font-size:clamp(42px,5vw,72px)}.title{font-size:clamp(32px,3.6vw,52px)}
      .horizon{height:240px;margin-top:24px}
      .problem-stack{min-height:430px}
      .cycle{min-height:420px}
    }
    @media (prefers-reduced-motion:reduce){
      *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
    }
    @media print{
      html,body{overflow:visible;background:var(--bg)}
      .topbar,.progress-rail,.dot-nav,.auto-timer,.swipe-hint,.notes,.overlay,.grain,.wash{display:none!important}
      .deck{height:auto}.slide{position:relative;opacity:1!important;visibility:visible!important;transform:none!important;page-break-after:always;height:100vh;pointer-events:auto}
      .reveal,.reveal-left,.reveal-right,.journey-step,.arch-node,.phase,.pipe-step,.life-point,.life-card{opacity:1!important;transform:none!important}
    }
  
/* 家書風格：水青封面、紙張章節、深墨結尾。 */
html {scroll-behavior:smooth;scroll-padding-top:64px}
html,body {height:auto;min-height:100%;overflow-x:clip}
button,a {touch-action:manipulation}
a,button,.key {white-space:nowrap}
button:focus-visible,a:focus-visible {outline:2px solid var(--color-focus);outline-offset:5px}
h1,h2,h3 {font-style:normal;overflow-wrap:anywhere;min-width:0}
.topbar {height:72px;padding:0 var(--pad-x);background:var(--color-sea);border-bottom:1px solid var(--color-rule-soft);gap:18px}
.brand {min-width:0;gap:10px}
.brand b {font-family:var(--font-wordmark);font-size:32px;font-weight:400;letter-spacing:-.045em}
.brand span {font-family:var(--font-body);font-size:10px;letter-spacing:.04em}
.chapter {font-size:11px}
.top-actions {gap:5px;align-items:center}
.icon-btn {width:34px;height:38px}
.mode-btn {padding:9px 14px;border:1px solid var(--color-ink);border-radius:var(--radius-button);font-size:12px;margin-right:12px}
.mode-btn:hover,.mode-btn[aria-pressed="true"] {background:var(--color-ink);color:var(--color-paper)}
.deck {height:auto}
.slide {--bg:var(--color-paper);--surface:var(--color-white);background:var(--bg)}
.slide:nth-of-type(odd) {--bg:var(--color-sea-light);--surface:var(--color-paper)}
.slide:first-child {--bg:var(--color-sea)}
.slide-inner {width:min(1280px,100%);height:auto;max-height:none}
body[data-mode="reading"] .slide {position:relative;opacity:1;visibility:visible;pointer-events:auto;transform:none;min-height:100svh;overflow:visible;padding:var(--pad-y) var(--pad-x);scroll-margin-top:0}
body[data-mode="reading"] .slide+.slide {border-top:1px solid var(--color-rule-soft)}
body[data-mode="reading"] .slide-inner {padding:0}
body[data-mode="reading"] .slide:first-child {padding-top:130px;padding-bottom:100px}
body[data-mode="presentation"] {height:100dvh;overflow-y:hidden}
body[data-mode="presentation"] .deck {height:100dvh}
body[data-mode="presentation"] .slide {height:100dvh;overflow-y:auto;overscroll-behavior:contain;padding-top:100px;padding-bottom:90px;align-items:safe center}
body[data-mode="presentation"] .slide-inner {height:auto;flex-shrink:0}
body[data-mode="presentation"] .slide:not(.active) {visibility:hidden;transition:none}
.eyebrow {font-family:var(--font-body);font-size:12px;letter-spacing:.07em;color:var(--color-muted);font-style:normal;margin-bottom:22px}
.display {font-size:clamp(44px,4.8vw,78px);font-weight:500;line-height:1.4;letter-spacing:-.045em;margin:0 0 24px;max-width:760px}
.title {font-size:clamp(32px,3.7vw,58px);font-weight:500;line-height:1.35;letter-spacing:-.04em;margin:0 0 22px}
.display .accent,.title .accent,.title .gold {font-style:normal;color:inherit}
.lead {font-size:clamp(15px,1.25vw,19px);line-height:1.9;max-width:760px}
.cover-grid {grid-template-columns:minmax(0,1.2fr) minmax(0,.85fr);gap:clamp(30px,5vw,80px)}
.cover-sub {font-size:12px;line-height:1.8;margin-top:24px}
.cover-metrics {margin-top:28px}
.cover-metric strong {font-family:var(--font-wordmark);font-size:30px;color:var(--color-ink);font-weight:400}
.cover-metric span {line-height:1.6}
.cover-letter {position:relative;min-height:550px;display:grid;place-items:start center;isolation:isolate;padding:10px 15px 0}
.letter-sheet {position:relative;z-index:1;width:90%;padding:32px 30px 90px;background:var(--color-paper);border:1px solid var(--color-rule-soft);box-shadow:0 20px 50px var(--color-shadow);transform:translateY(calc(var(--letter-progress,0) * -34px)) rotate(-4deg);transition:transform .12s linear}
.letter-overline {font-size:11px;color:var(--color-muted)}
.letter-title {font-family:var(--font-display);font-size:clamp(24px,2.25vw,36px);line-height:1.6;margin:20px 0 22px;letter-spacing:-.03em}
.register-list li {font-size:13px;padding:12px 0;grid-template-columns:24px minmax(0,1fr)}
.register-list i {font-family:var(--font-wordmark);font-size:16px}
.letter-signature {display:block;font-family:var(--font-wordmark);font-size:23px;color:var(--color-muted);margin-top:25px}
.letter-envelope {position:absolute;bottom:0;left:0;right:0;height:235px;z-index:2;background:var(--color-envelope);box-shadow:0 22px 35px var(--color-shadow);transform:rotate(3deg);border:1px solid var(--color-rule-soft)}
.letter-envelope::before,.letter-envelope::after {content:"";position:absolute;inset:0;background:var(--color-envelope-front);clip-path:polygon(0 0,50% 54%,100% 0,100% 100%,0 100%)}
.letter-envelope::after {background:var(--color-envelope-fold);clip-path:polygon(0 100%,50% 43%,100% 100%)}
.letter-seal {position:absolute;z-index:3;left:calc(50% - 24px);top:91px;display:grid;place-items:center;width:48px;height:48px;background:var(--color-seal);color:var(--color-paper);border:3px double var(--color-seal-light);border-radius:50%;font-family:var(--font-wordmark);font-size:28px}
.progress-rail {left:0;right:0;bottom:0;height:60px;padding:0 var(--pad-x);background:var(--color-sea);border-top:1px solid var(--color-rule-soft);gap:20px}
.nav-btn {width:38px;height:38px;border-radius:var(--radius-button)}
.track {background:var(--color-rule-soft)}
.track-fill,.track-dot {background:var(--color-ink)}
.dot-nav {right:12px;gap:1px}
.dot-nav button {width:24px;height:24px;background:none;display:grid;place-items:center}
.dot-nav button::after {content:"";width:6px;height:6px;border:1px solid var(--color-muted);border-radius:50%;background:var(--color-paper)}
.dot-nav button.active {transform:none;background:none}
.dot-nav button.active::after {background:var(--color-ink);border-color:var(--color-ink)}
.dot-nav button::before {right:30px;max-width:300px}
.swipe-hint {display:none}
.protocol,.decision-tree {background:var(--color-paper);border:1px solid var(--color-rule-soft);box-shadow:0 14px 40px var(--color-shadow-soft);border-radius:2px}
.protocol {padding:32px}
.protocol-head,.register-head,.tree-root span {font-family:var(--font-body);letter-spacing:.04em}
.protocol-title {font-size:28px;line-height:1.5}
.decision-tree {min-height:490px;padding:30px}
.risk-card {opacity:1;min-height:220px;color:var(--color-ink)}
.risk-card:not(.selected) {border-top-color:var(--color-rule);background:none}
.risk-card.selected {background:var(--color-sea-light);padding-left:12px}
.case-btn {border-radius:var(--radius-button);font-size:12px;min-height:40px}
.case-btn.active {background:var(--color-ink);color:var(--color-paper);border-color:var(--color-ink)}
.risk-letter {font-family:var(--font-wordmark);font-size:34px}
.guardrail::before {content:""}
.problem-item span,.protocol span,.risk-card p,.moat span,.channel-reason {font-size:13px;line-height:1.7}
.problem-item b {font-size:16px;line-height:1.7}
.verdict {font-size:20px;line-height:1.6}
.problem-stack {min-height:490px}
.failure-marker {font-style:normal;font-size:14px;padding:10px;background:var(--bg)}
.paper-card {border:1px solid var(--color-rule-soft)}
.horizon {margin-top:36px;height:270px}
.horizon-line {background:var(--color-rule)}
.life-card {width:18%}
.life-card b {font-size:18px;line-height:1.6}
.life-card span {font-size:12px;line-height:1.7}
.big-stat strong,.pilot strong,.ask strong {font-family:var(--font-wordmark);font-weight:400;font-size:40px;color:var(--color-ink)}
.big-stat strong.teal,.big-stat strong.gold {color:var(--color-ink)}
.big-stat {padding-top:22px}
.journey-stage {padding:25px 0 0;margin-top:30px}
.journey-line {display:none}
.journey-steps {gap:16px;grid-template-columns:repeat(4,minmax(0,1fr))}
.journey-step {border-top:1px solid var(--color-rule);padding:18px 0 16px}
.journey-step p {display:block;font-size:13px;line-height:1.7}
.journey-step h3 {font-size:16px}
.step-icon {font-family:var(--font-wordmark);font-size:26px;color:var(--color-muted)}
.arch-row {gap:24px}
.arch-node b {font-size:14px;line-height:1.7}
.arch-node span {font-size:12px;line-height:1.7}
.arch-node i {font-family:var(--font-wordmark);font-size:21px;margin-bottom:24px;background:var(--bg);display:inline-block;padding-right:10px}
.graph-zone {grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr)}
.graph-card {padding:24px;background:var(--color-paper);border:1px solid var(--color-rule-soft)}
.graph-card h3 {line-height:1.7}
.entity {padding:5px 0;line-height:1.6}
.entity-core {font-style:normal;line-height:1.6}
.cycle {min-height:460px;grid-template-columns:minmax(0,1fr) 130px minmax(0,1fr)}
.cycle-core {height:130px;border-radius:50%;border-color:var(--color-rule);background:var(--color-paper)}
.cycle-core b {font-family:var(--font-wordmark);font-size:28px}
.rev-layer {grid-template-columns:130px minmax(0,1fr) auto;line-height:1.7}
.rev-layer strong {font-size:12px}
.econ b {font-family:var(--font-wordmark);font-size:25px}
.channel-stage {min-height:440px}
.channel-row,.channel-pipe {gap:20px}
.channel {font-size:14px;line-height:1.7}
.pipe-step {font-size:14px;line-height:1.6}
.pipe-step b {font-family:var(--font-wordmark);font-size:24px}
.phase-card h3 {line-height:1.6}
.phase-card .weeks {font-size:12px;letter-spacing:0}
.phase-card ul {line-height:1.9}
.gate {line-height:1.7}
.slide:last-child {--bg:var(--color-ink);--ink:var(--color-paper);--muted:var(--color-inverse-muted);--line:var(--color-inverse-rule);--bronze:var(--color-paper);color:var(--ink)}
.close-title {font-size:clamp(36px,4.6vw,70px);font-weight:500;line-height:1.45;letter-spacing:-.03em}
.close-title .accent {color:inherit;font-style:normal}
.go-word {font-size:15px;font-style:normal;letter-spacing:.07em;color:var(--color-inverse-muted)}
.close-lead {line-height:1.8;font-size:17px}
.close-slide .ask strong {color:var(--color-paper)}
.close-slide .closing-line {font-size:22px;line-height:1.7}
.closing-actions {align-items:center;flex-wrap:wrap;gap:24px}
.cta {padding:12px 24px;background:var(--color-paper);color:var(--color-ink);border:1px solid var(--color-paper);border-radius:var(--radius-button);font-size:14px}
.cta.secondary {padding:8px 0;border:0;border-bottom:1px solid var(--color-inverse-rule);color:var(--color-inverse-muted);background:none}
.cta:hover {background:var(--color-sea);color:var(--color-ink)}
.cta.secondary:hover {background:none;color:var(--color-paper)}
.overlay {inset:0;width:min(880px,calc(100% - 40px));height:fit-content;max-height:calc(100dvh - 40px);border:0;margin:auto;padding:0;color:var(--color-ink);background:var(--color-paper);display:none;opacity:1;visibility:visible;box-shadow:var(--shadow)}
.overlay[open] {display:block}
.overlay::backdrop {background:var(--color-shadow)}
.drawer {width:100%;border:0;box-shadow:none;background:var(--color-paper);max-height:calc(100dvh - 40px);padding:32px}
.source-link {white-space:normal;line-height:1.7}
.source-grid {column-gap:28px}
.notes {background:var(--color-paper);color:var(--color-ink);bottom:72px;box-shadow:var(--shadow)}
.notes b {color:var(--color-accent)}
.help-grid {column-gap:24px}
.micro {font-size:12px;line-height:1.7}
body[data-mode="reading"] .slide:not(.active) :is(.reveal,.reveal-left,.reveal-right,.journey-step,.arch-node,.phase,.pipe-step,.life-card,.life-point) {opacity:1;transform:none}
body[data-mode="reading"] .slide:not(.active) .horizon-line {transform:scaleX(1)}

@media (min-width:821px) and (max-width:1180px) {
  .business-grid,.triage-grid {grid-template-columns:minmax(0,1fr)}
  .cycle {min-height:340px;width:min(650px,100%);margin:auto}
  .decision-tree {min-height:0}
  .cover-letter {min-height:530px}
  .letter-sheet {padding:28px 22px 85px}
}
@media (max-width:820px) {
  :root {--pad-x:24px;--pad-y:100px}
  .topbar {height:68px;gap:10px}
  .brand {margin-right:auto}
  .brand b {font-size:29px}
  .brand span {display:none}
  .top-actions {gap:3px}
  .mode-btn {margin-right:0;padding:8px 10px;font-size:11px}
  .icon-btn {width:30px;height:34px}
  #autoBtn,#fullBtn {display:none}
  .cover-grid,.split,.solution-grid,.triage-grid,.business-grid,.gtm-layout,.graph-zone {grid-template-columns:minmax(0,1fr);gap:44px}
  .display {font-size:clamp(40px,7vw,58px);line-height:1.4}
  .title,.slide[id="07"] .title {font-size:clamp(30px,5.7vw,46px);line-height:1.5}
  .lead {font-size:15px;line-height:1.9}
  .cover-metrics,.insight-metrics,.ask-grid,.pilot-box {grid-template-columns:repeat(3,minmax(0,1fr))}
  .cover-metric {padding-right:10px}
  .cover-metric strong {font-size:26px}
  .cover-metric span {font-size:10px}
  .cover-letter {width:min(410px,100%);min-height:510px;margin:0 auto}
  .letter-title {font-size:29px}
  .letter-envelope {height:210px}
  .letter-seal {top:80px}
  .register-list li {padding:10px 0}
  .letter-sheet {padding:25px 22px 75px}
  .progress-rail {padding:0 var(--pad-x);height:56px;gap:14px}
  .nav-btn {height:34px;width:34px}
  body[data-mode="reading"] .slide {min-height:0;padding:90px var(--pad-x)}
  body[data-mode="reading"] .slide:first-child {padding-top:108px;padding-bottom:86px}
  body[data-mode="presentation"] .slide {display:block;padding-top:96px;padding-bottom:82px}
  body[data-mode="presentation"] .slide-inner {min-height:0;padding:0}
  .problem-stack {min-height:390px}
  .paper-card {width:82%;padding:22px 18px}
  .failure-marker {font-size:12px}
  .problem-item {grid-template-columns:24px minmax(0,1fr);gap:10px}
  .horizon {height:auto;display:grid;grid-template-columns:minmax(0,1fr);gap:28px;padding-left:26px;border-left:1px solid var(--color-rule);margin:32px 0 36px}
  .horizon-line,.life-point {display:none}
  .life-card {position:relative;width:100%;left:auto!important;top:auto!important;bottom:auto!important}
  .life-card:nth-of-type(odd),.life-card:nth-of-type(even) {left:auto!important}
  .life-card::before {content:"";position:absolute;left:-31px;top:10px;width:8px;height:8px;background:var(--color-accent);border-radius:50%}
  .life-card b {font-size:18px}
  .life-card span {font-size:13px}
  .big-stat strong {font-size:32px}
  .big-stat {padding:18px 12px 0 0}
  .big-stat span {font-size:11px}
  .trust-bar,.econ-grid,.beachheads,.gates {grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
  .protocol {padding:25px}
  .journey-stage,.roadmap {overflow:visible}
  .journey-steps {min-width:0;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px 22px}
  .journey-step p {display:block;font-size:12px}
  .completion-state {grid-template-columns:minmax(0,1fr)}
  .decision-tree {min-height:0;padding:22px}
  .risk-row {grid-template-columns:minmax(0,1fr);gap:18px}
  .risk-card {min-height:0;padding:16px 10px}
  .risk-card.selected {padding-left:14px}
  .risk-card:not(.selected) p,.risk-card:not(.selected) ul {display:none}
  .risk-letter {display:inline-block;font-size:28px;margin:0 16px 0 0}
  .risk-card h3 {display:inline;font-size:15px}
  .risk-card.selected p {margin-top:10px}
  .arch-row {grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
  .arch-node i {margin-bottom:8px}
  .rev-layer {grid-template-columns:minmax(0,1fr) auto}
  .cycle {grid-template-columns:minmax(0,1fr);grid-template-rows:auto;gap:0;min-height:0}
  .cycle .fly-node,.cycle-core {grid-column:auto;grid-row:auto;text-align:left;height:auto;align-self:auto;padding:18px 0}
  .cycle-core {border-radius:0;background:none;border:0;border-block:1px solid var(--color-rule);display:block}
  .channel-stage {min-height:0}
  .channel-row {display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
  .channel-pipe {grid-template-columns:minmax(0,1fr);gap:18px}
  .pipe-step {display:flex;gap:18px;align-items:center}
  .pipe-step b {margin:0;width:22px}
  .road-phases {min-width:0;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
  .road-line {display:none}
  .phase-dot {display:none}
  .phase-card {border-top:1px solid var(--color-rule);padding-top:18px}
  .phase-card h3 {font-size:21px}
  .phase-card ul {font-size:12px}
  .close-title {font-size:clamp(31px,6vw,46px);line-height:1.6}
  .close-lead {font-size:15px}
  .close-slide .closing-line {font-size:19px}
  .ask-grid {margin-top:28px}
  .ask {padding:20px 8px 0}
  .ask strong,.pilot strong {font-size:31px}
  .ask span,.pilot span {font-size:11px;line-height:1.6}
  .drawer {padding:24px}
  .notes {max-height:40vh;overflow:auto;font-size:12px}
  .close-slide {align-items:stretch}
}
@media (max-width:374px) {
  :root {--pad-x:18px}
  .brand b {font-size:25px}
  .icon-btn {width:27px}
  .top-actions {gap:0}
  .letter-title {font-size:26px}
  .cover-letter {min-height:495px}
  .letter-envelope {height:192px}
  .display {font-size:37px}
  .drawer {padding:20px}
}
@media (prefers-reduced-motion:reduce) {
  html {scroll-behavior:auto}
  .letter-sheet {transform:rotate(-4deg)}
  *,*::before,*::after {animation:none!important;transition:none!important}
}
@media print {
  html,body {overflow:visible;height:auto}
  body[data-mode] .deck {height:auto}
  body[data-mode] .slide {display:block;position:relative;opacity:1!important;visibility:visible!important;min-height:100vh;height:auto;break-after:page;overflow:visible;padding:48px;transform:none!important}
  .topbar,.progress-rail,.dot-nav,.auto-timer,.notes,.overlay {display:none!important}
}

/* 一般筆電上的簡報模式收緊輔助資訊，完整章節同屏可讀。 */
@media (min-width:821px) and (max-height:900px) {
  body[data-mode="presentation"] .eyebrow {margin-bottom:12px}
  body[data-mode="presentation"] .title {font-size:clamp(30px,3.1vw,46px);line-height:1.35;margin:0 0 14px}
  body[data-mode="presentation"] .lead {font-size:15px;line-height:1.75}
  body[data-mode="presentation"] .problem-list {margin-top:20px}
  body[data-mode="presentation"] .problem-item {padding:12px 0}
  body[data-mode="presentation"] .verdict {margin-top:16px;padding-top:14px;font-size:18px}
  body[data-mode="presentation"] .horizon {height:230px;margin-top:24px}
  body[data-mode="presentation"] .journey-stage {margin-top:16px;padding-top:10px}
  body[data-mode="presentation"] .journey-step {padding:13px 0}
  body[data-mode="presentation"] .completion-state {margin-top:20px;padding-top:14px}
  body[data-mode="presentation"] .step-icon {font-size:22px;margin-bottom:8px}
  body[data-mode="presentation"] .arch-node i {margin-bottom:12px;font-size:18px}
  body[data-mode="presentation"] .arch-node b {font-size:12px;line-height:1.4}
  body[data-mode="presentation"] .arch-node span {font-size:11px;line-height:1.45}
  body[data-mode="presentation"] .graph-zone {margin-top:16px;padding-top:16px;gap:22px}
  body[data-mode="presentation"] .graph-card {padding:16px 20px}
  body[data-mode="presentation"] .graph-card h3 {font-size:20px;margin-bottom:10px}
  body[data-mode="presentation"] .moat {padding:8px 0}
  body[data-mode="presentation"] .moat span {font-size:11px;line-height:1.5}
  body[data-mode="presentation"] .quote {margin-top:12px;padding-top:12px;font-size:17px}
  body[data-mode="presentation"] .revenue-stack {margin-top:18px}
  body[data-mode="presentation"] .rev-layer {padding:9px 0}
  body[data-mode="presentation"] .econ-grid {margin-top:12px}
  body[data-mode="presentation"] .econ {padding-top:8px}
  body[data-mode="presentation"] .econ b {font-size:22px}
  body[data-mode="presentation"] .close-title {font-size:clamp(36px,4.2vw,60px);line-height:1.35}
  body[data-mode="presentation"] .ask-grid {margin-top:24px}
  body[data-mode="presentation"] .closing-line {margin-top:22px;padding-top:14px}
}
@media (min-width:821px) and (max-height:900px) {
  body[data-mode="presentation"] .slide {padding-top:92px;padding-bottom:76px}
  body[data-mode="presentation"] .slide[id="07"] .title {font-size:36px;margin:0 0 10px}
  body[data-mode="presentation"] .slide[id="07"] .lead {font-size:15px}
  body[data-mode="presentation"] .slide[id="07"] .architecture {margin-top:12px}
  body[data-mode="presentation"] .slide[id="07"] .graph-zone {grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);margin-top:14px;padding-top:14px}
  body[data-mode="presentation"] .slide[id="07"] .graph-card {padding:0;border:0;background:none}
  body[data-mode="presentation"] .slide[id="07"] .graph-card h3 {font-size:18px;margin-bottom:8px}
  body[data-mode="presentation"] .slide[id="07"] .moat {padding:6px 0}
  body[data-mode="presentation"] .slide[id="07"] .quote {font-size:15px;margin-bottom:0}
}