@import url('/share.css?v=20261001-134');
.learn-toolbar{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}.learn-toolbar input,.learn-toolbar select{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:12px;padding:11px 13px;min-height:42px}.learn-toolbar input{flex:1;min-width:220px}.strategy-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.strategy-card{border:1px solid var(--line);background:var(--surface);border-radius:17px;padding:16px;text-decoration:none;display:grid;gap:8px;transition:.18s transform,.18s box-shadow}.strategy-card:hover{transform:translateY(-2px);box-shadow:0 12px 30px #2d376415}.strategy-card h3{margin:0;font-size:17px}.strategy-card p{margin:0;font-size:13px}.strategy-card .meta{margin:0}.tier-beginner{--tier:#2d9d68}.tier-intermediate{--tier:#338bd2}.tier-advanced{--tier:#7b61d1}.tier-expert{--tier:#d06b3c}.strategy-card{border-top:3px solid var(--tier,var(--primary))}
.lesson-layout{display:grid;grid-template-columns:minmax(560px,820px) minmax(270px,360px);gap:26px;align-items:start;justify-content:center;margin-top:22px}.lesson-board{display:grid;grid-template-columns:repeat(9,1fr);width:100%;max-width:820px;aspect-ratio:1;border:2.5px solid #525a72;background:#525a72;gap:1px;border-radius:16px;overflow:hidden}.lesson-cell{position:relative;display:grid;place-items:center;background:var(--cell);font-weight:850;color:var(--entry);font-size:clamp(16px,2.8vw,26px)}.lesson-cell.given{color:var(--given)}.lesson-cell.highlight{background:#fff1bd}.lesson-cell.target{background:#ccefd8;outline:3px solid #2aa45f;outline-offset:-3px}.lesson-cell.rowhl,.lesson-cell.colhl,.lesson-cell.boxhl{background:color-mix(in srgb,var(--primary) 10%,var(--cell))}.lesson-cell .candidate-grid{position:absolute;inset:2px;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);font-size:clamp(7px,1.15vw,11px);font-weight:750;color:var(--note)}.lesson-cell .candidate-grid span{display:grid;place-items:center}.lesson-cell .candidate-grid .em{color:#b42318;background:#ffe4e1;border-radius:50%;font-weight:900}.lesson-cell .candidate-grid .elim{text-decoration:line-through;color:#d92d20;opacity:.65}.lesson-cell .promoted{font-size:1.05em;color:#8a4db8;font-weight:950}.lesson-cell.box-right{box-shadow:inset -2px 0 0 #525a72}.lesson-cell.box-bottom:after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:#525a72;z-index:3}.lesson-side{display:grid;gap:12px}.lesson-copy{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:17px}.lesson-copy h2,.lesson-copy h3{margin:0 0 9px}.lesson-copy p{margin:0}.step-nav{display:grid;grid-template-columns:auto 1fr auto;gap:9px;align-items:center}.step-count{text-align:center;font-weight:850;color:var(--muted)}.step-btn{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:12px;padding:10px 14px;cursor:pointer;font-weight:850}.step-btn:disabled{opacity:.4;cursor:not-allowed}.lesson-actions{display:grid;gap:9px}.back-link{display:inline-flex;gap:6px;align-items:center;text-decoration:none;color:var(--primary);font-weight:800;margin-bottom:8px}
@media(max-width:900px){.strategy-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-layout{grid-template-columns:1fr}}
@media(max-width:580px){.strategy-grid{grid-template-columns:1fr}.learn-toolbar{display:grid}.learn-toolbar input{min-width:0}.lesson-layout{margin-top:14px}.lesson-copy{padding:14px}}

.learn-download-row{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 4px}.learn-download-row .web-store-badge{min-width:215px}.lesson-side{max-width:360px}.lesson-cell{font-size:clamp(18px,2vw,30px)}
@media(max-width:1120px){.lesson-layout{grid-template-columns:minmax(0,820px)}.lesson-side{max-width:820px}.learn-download-row{justify-content:flex-start}}

.global-site-header + .shell > .brand{display:none}
.global-site-header + .shell{padding-top:28px}

/* Keep interactive strategy boards fully visible on common laptop/desktop screens. */
@media(min-width:901px){
  .lesson-layout{
    --lesson-board:min(610px,calc(100vh - 290px),calc(100vw - 470px));
    grid-template-columns:var(--lesson-board) minmax(280px,360px);
    gap:22px;
    margin-top:14px;
  }
  .lesson-board{
    width:var(--lesson-board);
    max-width:var(--lesson-board);
  }
  .lesson-side{
    max-width:360px;
  }
}
@media(min-width:901px) and (max-height:820px){
  .lesson-layout{
    --lesson-board:min(535px,calc(100vh - 260px),calc(100vw - 460px));
    margin-top:10px;
    gap:18px;
  }
  .lesson-copy{padding:14px}
}
@media(min-width:901px) and (max-width:1120px){
  .lesson-layout{
    grid-template-columns:var(--lesson-board);
  }
  .lesson-side{
    max-width:var(--lesson-board);
  }
}


/* Final small-screen fit for learning pages. */
@media(max-width:760px){
  html,body{width:100%;max-width:100%;overflow-x:hidden}
  .shell{
    width:100%!important;
    max-width:100%!important;
    padding:8px 6px 28px!important;
  }
  .page{
    width:100%!important;
    max-width:100%!important;
    padding:14px 10px 18px!important;
    overflow:hidden!important;
  }
  .topline,.topline>div:first-child{min-width:0!important}
  .topline h1{font-size:clamp(28px,8vw,36px)!important;overflow-wrap:anywhere!important}
  .learn-toolbar{width:100%!important}
  .learn-toolbar input,.learn-toolbar select{width:100%!important;min-width:0!important}
  .strategy-grid{grid-template-columns:1fr!important}
  .strategy-card{min-width:0!important}
  .lesson-layout{
    display:block!important;
    width:100%!important;
    max-width:100%!important;
  }
  .lesson-board{
    width:100%!important;
    max-width:100%!important;
  }
  .lesson-side{
    width:100%!important;
    max-width:100%!important;
    margin-top:16px!important;
  }
  .step-nav{
    grid-template-columns:auto minmax(0,1fr) auto!important;
    gap:6px!important;
  }
  .step-btn{padding:9px 10px!important;font-size:12px!important}
  .learn-download-row{
    width:100%!important;
    display:grid!important;
    grid-template-columns:1fr!important;
  }
  .learn-download-row .web-store-badge{
    width:100%!important;
    min-width:0!important;
  }
}

/* 2026-09-30 grouped Learn & Strategies layout */
.shell{width:min(1480px,calc(100% - 28px))!important}
.learn-progress-summary{
  display:grid;gap:9px;margin:18px 0 14px;padding:14px 16px;
  border:1px solid var(--line);border-radius:16px;background:var(--surface);
  box-shadow:0 8px 24px rgba(35,57,96,.05)
}
.learn-progress-copy{display:flex;align-items:center;gap:8px;color:var(--ink);font-size:13px}
.learn-progress-copy span{font-size:18px}
.learn-progress-track{height:5px;border-radius:999px;background:var(--soft);overflow:hidden}
.learn-progress-track span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,#45b87a,#3c96e7)}
.strategy-grid{display:grid!important;grid-template-columns:1fr!important;gap:20px!important}
.strategy-tier-section{
  --tier:#5148c8;display:grid;gap:10px;padding-top:4px
}
.strategy-tier-head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:8px 2px 8px;border-bottom:2px solid color-mix(in srgb,var(--tier) 22%,var(--line))
}
.strategy-tier-title{display:flex;align-items:center;gap:9px;color:var(--ink)}
.strategy-tier-title>span{
  width:34px;height:34px;display:grid;place-items:center;border-radius:10px;
  background:color-mix(in srgb,var(--tier) 12%,var(--surface));color:var(--tier);font-size:17px
}
.strategy-tier-title strong{font-size:17px}
.strategy-tier-count{
  display:grid;place-items:center;min-width:32px;height:25px;padding:0 8px;
  border-radius:999px;background:color-mix(in srgb,var(--tier) 10%,var(--surface));
  color:var(--tier);font-size:11px;font-weight:900
}
.strategy-tier-section.tier-beginner{--tier:#34a65f}
.strategy-tier-section.tier-intermediate{--tier:#2f8de2}
.strategy-tier-section.tier-advanced{--tier:#f0832c}
.strategy-tier-section.tier-expert{--tier:#7b61d1}
.strategy-tier-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.strategy-card{
  min-height:136px!important;display:grid!important;
  grid-template-columns:46px minmax(0,1fr) 24px!important;
  align-items:center!important;gap:12px!important;padding:16px!important;
  border-top:1px solid var(--line)!important;
  border-left:3px solid var(--tier,var(--primary))!important
}
.strategy-card-icon{
  width:44px;height:44px;display:grid;place-items:center;border-radius:50%;
  background:color-mix(in srgb,var(--tier) 13%,var(--surface));color:var(--tier);
  font-size:18px;font-weight:900
}
.strategy-card-copy{min-width:0;display:grid;gap:4px}
.strategy-card-copy h3{margin:0!important;font-size:16px!important}
.strategy-card-copy small{color:var(--muted);font-size:11px}
.strategy-card-copy p{font-size:12.5px!important;line-height:1.45!important}
.strategy-card-arrow{color:color-mix(in srgb,var(--tier) 45%,var(--muted));font-size:25px}
.strategy-empty{grid-column:1/-1}
@media(max-width:780px){
  .strategy-tier-grid{grid-template-columns:1fr}
  .learn-progress-summary{margin-top:10px}
  .strategy-card{min-height:122px!important}
}

.strategy-tier-section.tier-advanced .strategy-card{--tier:#f0832c!important}
.strategy-tier-section.tier-expert .strategy-card{--tier:#7b61d1!important}
.learn-progress-copy>span{color:#4b54d8;font-size:15px}


/* Compact app install prompt for shared puzzle / shared strategy pages. */
.top-install-prompt{
  width:min(720px,100%);
  margin:0 auto 10px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:8px 10px 8px 13px;
  border:1px solid var(--line);
  border-radius:14px;
  background:linear-gradient(135deg,var(--surface),color-mix(in srgb,var(--primary) 5%,var(--surface)));
  box-shadow:0 6px 18px rgba(23,41,71,.05);
}
.top-install-copy{display:grid;min-width:0}
.top-install-copy strong{color:var(--ink);font-size:13px}
.top-install-copy small{
  color:var(--muted);
  font-size:10.5px;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.top-install-google{
  flex:0 0 auto;
  min-height:34px;
  display:flex;
  align-items:center;
  gap:7px;
  padding:5px 10px;
  border-radius:10px;
  background:#101522;
  color:#fff;
  text-decoration:none;
  font-size:11px;
  font-weight:850;
}
.top-install-google:hover{filter:brightness(1.07);text-decoration:none}
.top-install-google .store-logo{width:20px;height:22px;display:grid;place-items:center}
.top-install-google svg{width:18px;height:21px;display:block}
@media(max-width:520px){
  .top-install-prompt{
    margin-bottom:5px;
    padding:6px 7px 6px 9px;
    border-radius:11px;
  }
  .top-install-copy strong{font-size:11.5px}
  .top-install-copy small{font-size:9px;max-width:170px}
  .top-install-google{
    min-height:31px;
    padding:4px 8px;
    font-size:10px;
  }
}


/* ===== Stable strategy lesson geometry: Next/Previous never resize the side panel ===== */
@media(min-width:1121px){
  .lesson-layout{
    align-items:stretch!important;
  }
  .lesson-side{
    height:var(--lesson-board)!important;
    min-height:var(--lesson-board)!important;
    max-height:var(--lesson-board)!important;
    display:grid!important;
    grid-template-rows:auto minmax(0,1fr) auto!important;
    gap:12px!important;
    overflow:hidden!important;
  }
  .lesson-side .lesson-copy:nth-child(2){
    min-height:0!important;
    overflow:auto!important;
    scrollbar-width:thin;
  }
  .lesson-actions{
    align-self:end!important;
  }
}
.lesson-view-downloads{
  justify-content:flex-end!important;
  margin-top:14px!important;
}
.lesson-view-downloads .web-store-badge{
  min-width:200px!important;
}
@media(max-width:1120px){
  .lesson-view-downloads{justify-content:flex-start!important}
}


/* ===== Strategy board: fixed 9x9 tracks and overlay box lines ===== */
.lesson-board{
  grid-template-columns:repeat(9,minmax(0,1fr))!important;
  grid-template-rows:repeat(9,minmax(0,1fr))!important;
}
.lesson-cell{
  min-width:0!important;
  min-height:0!important;
  overflow:hidden!important;
  box-sizing:border-box!important;
}
.lesson-cell.box-right{box-shadow:none!important}
.lesson-cell.box-bottom::after{display:none!important}
.lesson-edge-overlay{
  position:absolute;
  inset:0;
  z-index:4;
  pointer-events:none;
  box-sizing:border-box;
  border:0 solid transparent;
}
.lesson-cell.box-right>.lesson-edge-overlay{
  border-right:2px solid #525a72;
}
.lesson-cell.box-bottom>.lesson-edge-overlay{
  border-bottom:2px solid #525a72;
}

/* ===== Cache 119: tighter Learn / Strategy page titles and top spacing ===== */
.global-site-header + .shell{
  padding-top:12px!important;
}
.page{
  padding-top:12px!important;
}
.topline h1{
  font-size:clamp(22px,2.7vw,30px)!important;
  line-height:1.04!important;
  margin:3px 0 3px!important;
}
.topline p{
  font-size:12px!important;
  margin:0!important;
}
.back-link{
  margin-bottom:3px!important;
  font-size:12px!important;
}
.lesson-layout{
  margin-top:6px!important;
}
.lesson-copy h2{
  font-size:1.08rem!important;
}
.lesson-copy h3{
  font-size:1rem!important;
}


/* ===== Cache 121: lift inner strategy lessons away from the viewport edge ===== */
.global-site-header + .shell{
  padding-top:5px!important;
}
.page{
  padding-top:7px!important;
}
.lesson-layout{
  margin-top:0!important;
}
@media(min-width:901px) and (max-height:820px){
  .global-site-header + .shell{padding-top:2px!important}
  .page{padding-top:5px!important}
  .lesson-layout{margin-top:0!important}
}


/* ===== Cache 124: lesson-side ad + tighter lesson viewport ===== */
@media(min-width:1121px){
  .lesson-layout{--lesson-board:min(555px,calc(100vh - 225px),calc(100vw - 520px))!important;margin-top:0!important;gap:24px!important}
  .lesson-side{
    grid-template-rows:auto 68px minmax(0,1fr) auto!important;
    gap:10px!important
  }
  .lesson-side-ad{min-height:68px!important;margin:0!important}
  .lesson-step-copy{min-height:0!important;overflow:auto!important;scrollbar-width:thin}
}
#lessonView>.back-link{margin-bottom:3px!important}
.lesson-actions .btn{min-height:42px!important;padding:10px 12px!important}


/* Cache 124b: laptop lessons keep Previous/Next fully above the viewport edge. */
body:has(#lessonView:not(.hidden)) .top-install-prompt{
  min-height:42px!important;
  padding-top:6px!important;
  padding-bottom:6px!important;
  margin-bottom:6px!important;
}
body:has(#lessonView:not(.hidden)) .page{padding-top:8px!important}
body:has(#lessonView:not(.hidden)) .topline h1{font-size:24px!important;margin:2px 0!important}
body:has(#lessonView:not(.hidden)) .topline p{font-size:11.5px!important;margin:0!important;line-height:1.35!important}
body:has(#lessonView:not(.hidden)) #lessonView>.back-link{margin:3px 0 2px!important;font-size:11px!important}
@media(min-width:901px) and (max-height:820px){
  .lesson-layout{
    --lesson-board:min(475px,calc(100vh - 292px),calc(100vw - 520px))!important;
    margin-top:0!important;
    gap:22px!important;
  }
  .lesson-copy{padding:12px!important}
  .lesson-side{grid-template-rows:auto 58px minmax(0,1fr) auto!important}
  .lesson-side-ad{min-height:58px!important}
  .step-nav{margin-top:8px!important}
  .step-btn{padding:8px 12px!important;min-height:38px!important}
}

/* Cache 134: learning labels and lesson copy stay readable at compact sizes. */
.strategy-card h3,.lesson-copy h2,.lesson-copy h3,.step-btn,.back-link{
  font-weight:850!important;
}
.strategy-card p,.lesson-copy p,.learn-toolbar input,.learn-toolbar select{
  font-weight:550!important;
}
.step-count{font-weight:850!important}