:root{--ink:#17365D;--accent:#0070C0;--accent-soft:#eaf4ff;--gold:#b77600;--muted:#526273;--line:#dfe6ee;--soft:#f7f9fc;--paper:#fff;--footer:#17365D;--max:1180px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,Helvetica,sans-serif;color:#17202a;background:#fff;line-height:1.55;-webkit-font-smoothing:antialiased}a{color:var(--accent)}img{max-width:100%;height:auto}.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;z-index:100;background:#fff;padding:10px;border:2px solid var(--accent)}
.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);backdrop-filter:blur(8px)}.nav{width:min(var(--max),calc(100% - 32px));margin:auto;min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:18px}.brand{font-family:Calibri,Arial,sans-serif;color:var(--ink);font-size:23px;font-weight:800;text-decoration:none}.nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap}.nav-links a{color:var(--ink);font-size:14px;font-weight:700;text-decoration:none}.nav-links a:hover,.nav-links a:focus-visible{text-decoration:underline;text-underline-offset:4px}
.hero{background:linear-gradient(135deg,#f8fbff 0%,#eef6ff 55%,#fff 100%);border-bottom:1px solid var(--line)}.hero-inner{width:min(var(--max),calc(100% - 32px));margin:auto;padding:62px 0 52px}.eyebrow{margin:0 0 10px;color:var(--accent);font-size:13px;font-weight:800;text-transform:uppercase;letter-spacing:.08em}.hero h1{max-width:900px;margin:0;color:var(--ink);font-family:Calibri,Arial,sans-serif;font-size:clamp(38px,5.7vw,68px);line-height:1.02;letter-spacing:-.035em}.hero .lead{max-width:850px;margin:20px 0 0;color:var(--muted);font-size:clamp(17px,2vw,21px);line-height:1.65}.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:11px 17px;border-radius:9px;border:1px solid var(--accent);background:var(--accent);color:#fff;text-decoration:none;font-weight:800}.btn.secondary{background:#fff;color:var(--accent)}.btn:hover,.btn:focus-visible{text-decoration:underline;text-underline-offset:3px}
.section{width:min(var(--max),calc(100% - 32px));margin:auto;padding:56px 0}.section+.section{border-top:1px solid var(--line)}.section h2{margin:0 0 12px;color:var(--ink);font-family:Calibri,Arial,sans-serif;font-size:clamp(28px,3.3vw,42px);line-height:1.1}.section-lead{max-width:840px;margin:0 0 28px;color:var(--muted);font-size:16.5px;line-height:1.65}.sequence-heading{display:flex;align-items:baseline;justify-content:space-between;gap:15px;margin:34px 0 15px}.sequence-heading h3{margin:0;color:var(--ink);font-size:22px}.sequence-heading span{color:var(--muted);font-size:14px}.comic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.comic-card{display:grid;grid-template-columns:150px 1fr;min-height:220px;border:1px solid var(--line);border-radius:16px;background:var(--soft);overflow:hidden;color:#111;text-decoration:none;box-shadow:0 1px 4px rgba(0,0,0,.035);transition:transform .15s ease,border-color .15s ease,box-shadow .15s ease}.comic-card:hover,.comic-card:focus-visible{transform:translateY(-2px);border-color:#9bbbe6;box-shadow:0 8px 22px rgba(23,54,93,.09);outline:none}.comic-card img{width:150px;height:100%;object-fit:cover;object-position:top}.comic-copy{padding:20px}.comic-copy .kicker{color:var(--accent);font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.06em}.comic-copy h4{margin:6px 0 8px;color:var(--ink);font-size:22px;line-height:1.2}.comic-copy p{margin:0 0 14px;color:var(--muted);font-size:14.5px}.read-link{color:var(--accent);font-weight:800}
.breadcrumbs{width:min(var(--max),calc(100% - 32px));margin:0 auto;padding:20px 0 0;color:#687582;font-size:13px}.breadcrumbs a{color:#53677d;text-decoration:none}.breadcrumbs a:hover{text-decoration:underline}.viewer-hero{background:#f8fbff;border-bottom:1px solid var(--line)}.viewer-head{width:min(var(--max),calc(100% - 32px));margin:auto;padding:25px 0 30px;display:grid;grid-template-columns:1fr auto;gap:24px;align-items:end}.viewer-head h1{margin:0;color:var(--ink);font-family:Calibri,Arial,sans-serif;font-size:clamp(34px,4.8vw,58px);line-height:1.03}.viewer-head p{max-width:800px;margin:12px 0 0;color:var(--muted);font-size:16.5px}.progress-box{min-width:160px;text-align:right;color:var(--muted);font-size:13px;font-weight:700}.progress{height:7px;margin-top:8px;border-radius:99px;background:#dfe8f2;overflow:hidden}.progress span{display:block;height:100%;background:var(--accent);border-radius:99px}
.viewer{width:min(var(--max),calc(100% - 32px));margin:auto;padding:34px 0 58px;display:grid;grid-template-columns:minmax(0,2fr) minmax(290px,.8fr);gap:28px;align-items:start}.reader-frame{padding:10px;border:1px solid var(--line);border-radius:16px;background:#fff;box-shadow:0 7px 24px rgba(23,54,93,.08)}.reader-frame img{display:block;width:100%;border-radius:9px}.reader-actions{display:flex;justify-content:space-between;gap:10px;margin-top:18px}.sidebar{display:grid;gap:16px;position:sticky;top:90px}.panel,details{border:1px solid var(--line);border-radius:14px;background:var(--soft);padding:20px}.panel h2,details summary{margin:0;color:var(--ink);font-size:20px;font-weight:800}.panel p{margin:10px 0 0;color:var(--muted);font-size:14.5px}.vocab-intro{margin:9px 0 12px;color:var(--muted);font-size:13.5px}.vocab-list{list-style:none;margin:0;padding:0;display:grid;gap:0}.vocab-list li{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:8px 0;border-top:1px solid #e1e7ee;font-size:13.5px}.vocab-list strong{color:var(--ink)}.vocab-list span{color:var(--muted)}details summary{cursor:pointer}.lesson-link .btn{width:100%;margin-top:14px}.reading-note{margin-top:18px;padding:18px 20px;border-left:4px solid var(--gold);border-radius:9px;background:#fffaf0;color:var(--muted)}.reading-note strong{color:var(--ink)}
.site-footer{background:var(--footer);color:#fff;padding:28px 20px;text-align:center}.footer-nav{display:flex;justify-content:center;gap:12px 20px;flex-wrap:wrap;margin-bottom:12px;font-size:13px}.footer-nav a{color:#fff}.copyright{margin:0 0 7px;font-weight:700}.legal{max-width:900px;margin:auto;font-size:12px;opacity:.9}
@media(max-width:900px){.comic-grid{grid-template-columns:1fr}.viewer{grid-template-columns:1fr}.sidebar{position:static}.viewer-head{grid-template-columns:1fr}.progress-box{text-align:left;max-width:220px}.reader-actions{position:sticky;bottom:0;background:rgba(255,255,255,.96);padding:10px 0;z-index:10}.nav-links a:nth-child(2){display:none}}
@media(max-width:620px){.nav{min-height:60px}.nav-links{gap:12px}.nav-links a{font-size:13px}.hero-inner{padding:45px 0 40px}.section{padding:42px 0}.comic-card{grid-template-columns:105px 1fr;min-height:180px}.comic-card img{width:105px}.comic-copy{padding:15px}.comic-copy h4{font-size:19px}.viewer{width:min(100% - 20px,var(--max));padding-top:18px}.viewer-head,.breadcrumbs{width:min(100% - 24px,var(--max))}.reader-frame{padding:5px;border-radius:10px}.panel,details{padding:16px}.vocab-list li{grid-template-columns:1fr;gap:2px}.btn{padding:10px 12px;font-size:14px}.reader-actions .btn{flex:1}.brand{font-size:20px}}


/* === Coin lecture 2026-08-30: 2 sequences / 6 boards each === */
.collection-status{max-width:900px;margin:18px 0 0;padding:14px 16px;border-left:4px solid var(--accent);border-radius:8px;background:#fff;color:var(--muted);font-size:14px}
.collection-status strong{color:var(--ink)}
.comic-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.comic-card{grid-template-columns:118px 1fr;min-height:194px}
.comic-card img{width:118px}
.comic-copy{padding:16px}
.comic-copy h4{font-size:19px}
.comic-copy p{font-size:13.5px;line-height:1.45}
.sequence-heading{margin-top:38px}
.sequence-heading span{white-space:nowrap}
.vocab-policy{margin-top:12px;color:var(--muted);font-size:12.5px}
@media(max-width:1080px){.comic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.comic-card{grid-template-columns:130px 1fr}.comic-card img{width:130px}}
@media(max-width:720px){.comic-grid{grid-template-columns:1fr}.comic-card{grid-template-columns:112px 1fr}.comic-card img{width:112px}.sequence-heading{align-items:flex-start;flex-direction:column;gap:3px}}

/* === V3 vocabulary: 15 mixed useful items per board === */
@media(min-width:901px){
  .sidebar{max-height:calc(100vh - 105px);overflow-y:auto;scrollbar-gutter:stable;padding-right:4px}
}
.vocab-list li{padding:7px 0}
.vocab-list strong{font-weight:800}
@media(max-width:900px){
  .sidebar{max-height:none;overflow:visible;padding-right:0}
}


/* === V4 full-screen board viewer === */
.reader-frame{position:relative}
.reader-frame img[data-fullscreen-trigger]{cursor:zoom-in}
.fullscreen-open{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  margin:12px 0 2px;
  padding:10px 15px;
  border:1px solid var(--accent);
  border-radius:9px;
  background:#fff;
  color:var(--accent);
  font:inherit;
  font-weight:800;
  cursor:pointer;
}
.fullscreen-open:hover,.fullscreen-open:focus-visible{
  background:var(--accent-soft);
  text-decoration:underline;
  text-underline-offset:3px;
}
.comic-fullscreen{
  position:fixed;
  inset:0;
  z-index:9999;
  display:none;
  align-items:center;
  justify-content:center;
  padding:20px;
  background:rgba(0,0,0,.96);
}
.comic-fullscreen.is-open{display:flex}
.comic-fullscreen__image{
  display:block;
  max-width:calc(100vw - 40px);
  max-height:calc(100vh - 40px);
  width:auto;
  height:auto;
  object-fit:contain;
  border-radius:4px;
}
.comic-fullscreen__close{
  position:fixed;
  top:16px;
  right:16px;
  z-index:10000;
  width:48px;
  height:48px;
  border:2px solid rgba(255,255,255,.75);
  border-radius:999px;
  background:rgba(0,0,0,.62);
  color:#fff;
  font-size:30px;
  line-height:1;
  cursor:pointer;
}
.comic-fullscreen__close:hover,.comic-fullscreen__close:focus-visible{
  background:#fff;
  color:#111;
  outline:3px solid #79bfff;
  outline-offset:2px;
}
body.comic-fullscreen-open{overflow:hidden}
@media(max-width:620px){
  .comic-fullscreen{padding:8px}
  .comic-fullscreen__image{
    max-width:calc(100vw - 16px);
    max-height:calc(100vh - 16px);
  }
  .comic-fullscreen__close{
    top:10px;
    right:10px;
    width:46px;
    height:46px;
  }
  .fullscreen-open{width:100%}
}