:root{--blue:#2563EB;--blue-deep:#1D4ED8;--cyan:#22D3EE;--night:linear-gradient(155deg,#14121F,#211B3D 52%,#2E2657);--navy:#0F2C4C;--slate:#33506E;--muted:#6A819A;--line:#E7EDF3;--soft:#F5F8FC;--gold:#FFC53D;--gold-ink:#5A3D00;--disp:'Comfortaa',system-ui,sans-serif;--mono:'JetBrains Mono',monospace;--body:'Open Sans',system-ui,sans-serif;--sh:0 8px 24px rgba(15,44,76,.1);--lift:0 16px 40px rgba(15,44,76,.18)}
*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}
body{font-family:var(--body);color:var(--navy);line-height:1.6;background:#fff}
a{text-decoration:none;color:inherit}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
h1,h2,h3{font-family:var(--disp);font-weight:800}
.kick{font-family:var(--disp);font-weight:700;font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--blue)}
.sec{padding:72px 0}.sec h2{font-size:34px;margin:6px 0 8px;line-height:1.1}.sec .lead{font-size:17px;color:var(--slate);max-width:640px}
header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:20px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--disp);font-weight:800;font-size:18px}
.brand img{width:34px;height:34px}
.links{display:flex;gap:22px;margin-left:auto}.links a{font-weight:600;font-size:15px;color:var(--slate)}.links a:hover{color:var(--blue)}
.links .cta{background:var(--blue);color:#fff;font-family:var(--disp);font-weight:700;font-size:14px;padding:9px 17px;border-radius:12px}
.drop{position:relative}
.dropbtn{font-family:var(--body);font-weight:600;font-size:15px;color:var(--slate);background:0;border:0;cursor:pointer;padding:0}
.dropbtn:hover{color:var(--blue)}
.dropmenu{display:none;position:absolute;top:26px;left:-8px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--lift);padding:10px;min-width:236px;flex-direction:column;gap:2px;z-index:60}
.drop:hover .dropmenu,.drop.open .dropmenu{display:flex}
.dropmenu a{padding:9px 12px;border-radius:9px;font-weight:600;font-size:14.5px;color:var(--navy)}
.dropmenu a:hover{background:var(--soft);color:var(--blue)}
.dropmenu .dh{font-family:var(--disp);font-weight:800;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);padding:8px 12px 2px}
.dropmenu .allbooks{margin-top:6px;border-top:1px solid var(--line);padding-top:11px;color:var(--blue)}
.burger{display:none;margin-left:auto;background:0;border:0;font-size:24px;cursor:pointer}
.hero{background:var(--night);color:#fff;position:relative;overflow:hidden}
.hero .g1{position:absolute;width:820px;height:820px;right:-280px;top:-320px;border-radius:50%;background:radial-gradient(circle,#2563EB,transparent 62%);opacity:.5}
.hero .g2{position:absolute;width:520px;height:520px;left:-200px;bottom:-260px;border-radius:50%;background:radial-gradient(circle,#22D3EE,transparent 66%);opacity:.22}
.hero .gr{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:46px 46px}
.hero .wrap{position:relative;padding:80px 24px 84px}
.pill{display:inline-block;background:rgba(96,165,250,.16);border:2px solid rgba(96,165,250,.5);color:#bcd4ff;font-family:var(--disp);font-weight:800;font-size:12.5px;letter-spacing:.12em;padding:7px 16px;border-radius:30px}
.hero h1{font-size:58px;line-height:1.02;margin:20px 0 0;max-width:900px}.hero h1 .x{background:linear-gradient(90deg,#22D3EE,#60A5FA);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{font-size:19px;color:#dcd9ee;margin-top:22px;max-width:680px;font-weight:600}
.btns{margin-top:32px;display:flex;gap:14px;flex-wrap:wrap}
.btn{font-family:var(--disp);font-weight:800;font-size:16px;padding:15px 28px;border-radius:14px;display:inline-block;cursor:pointer}
.btn.gold{background:var(--gold);color:var(--gold-ink)}.btn.ghost{background:rgba(255,255,255,.08);color:#fff;border:2px solid rgba(255,255,255,.25)}
.meta{margin-top:24px;font-family:var(--mono);font-size:13px;color:#9b93c9}
.mont{display:flex;gap:14px;margin-top:34px;padding-bottom:6px;-webkit-mask-image:linear-gradient(90deg,#000 0,#000 66%,transparent 100%);mask-image:linear-gradient(90deg,#000 0,#000 66%,transparent 100%)}
.mont .mcw{width:152px;flex:none;border-radius:12px;overflow:hidden;box-shadow:0 18px 38px rgba(0,0,0,.55);outline:1px solid rgba(255,255,255,.16);outline-offset:-1px}
.mont .mc{background:linear-gradient(160deg,#1d1937,#2e2555)}
@media(max-width:900px){.mont .mcw{width:132px}}
@media(max-width:560px){.mont{display:none}}
.feat{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:30px}
.fc{background:var(--soft);border:1px solid var(--line);border-radius:20px;padding:22px}.fc .i{font-size:26px}.fc h3{font-size:17px;margin:10px 0 6px}.fc p{font-size:14px;color:var(--slate)}
.filter{display:flex;gap:10px;flex-wrap:wrap;margin:24px 0 8px}
.chip{font-family:var(--disp);font-weight:700;font-size:14px;padding:9px 18px;border-radius:30px;border:2px solid var(--line);background:#fff;color:var(--slate);cursor:pointer}
.chip.on{background:var(--blue);border-color:var(--blue);color:#fff}
.shead{display:flex;align-items:baseline;gap:14px;margin:38px 0 4px;scroll-margin-top:84px}.shead h3{font-size:22px}.shead span{font-size:14px;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:20px;margin-top:16px}
.bk{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--sh);display:flex;flex-direction:column;transition:.15s}
.bk:hover{transform:translateY(-4px);box-shadow:var(--lift)}
.bk .body{padding:13px 14px 15px;display:flex;flex-direction:column;flex:1}
.bk .tag{font-family:var(--mono);font-size:10.5px;font-weight:700;letter-spacing:.02em;text-transform:uppercase}
.bk .ti{font-size:15px;margin:6px 0 12px;line-height:1.25;flex:1}
.bk .ft{display:flex;align-items:center;justify-content:space-between}
.bk .pr{font-family:var(--mono);font-weight:700;font-size:16px}
.bk .buy{font-family:var(--disp);font-weight:700;font-size:13px;color:#fff;padding:8px 13px;border-radius:10px}
.bk .buy.soon{background:#e7ecf3;color:#8496a8}
.mcw{container-type:inline-size;display:block;width:100%}
.mc{position:relative;width:100%;aspect-ratio:795/1123;overflow:hidden;background:linear-gradient(160deg,#141226,#221d3c);color:#fff;padding:6cqw;display:flex;flex-direction:column;font-family:var(--disp)}
.mc:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 78% 12%,var(--c),transparent 55%);opacity:.85}
.mc:after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:11cqw 11cqw}
.mc>*{position:relative;z-index:1}
.mc .bd{align-self:flex-start;font-weight:800;font-size:3.3cqw;letter-spacing:.08em;text-transform:uppercase;background:rgba(255,255,255,.18);padding:1.4cqw 3.6cqw;border-radius:20px}
.mc .cr{width:11cqw;height:11cqw;border-radius:3cqw;background:var(--c);position:relative;margin-top:6cqw;flex:none}
.mc .cr:before,.mc .cr:after{content:"";position:absolute;background:#fff;border-radius:1px}
.mc .cr:before{left:4.75cqw;top:2.5cqw;width:1.5cqw;height:6cqw}.mc .cr:after{top:4.75cqw;left:2.5cqw;height:1.5cqw;width:6cqw}
.mc .wm{font-weight:800;font-size:8.4cqw;line-height:1;margin-top:5cqw}
.mc .rl{width:15cqw;height:1.5cqw;background:var(--c);border-radius:3px;margin:4.5cqw 0 3cqw}
.mc .bk2{font-weight:700;font-size:3.6cqw;letter-spacing:.14em;color:#d4d7ff}
.mc .tt{font-weight:700;font-size:5cqw;line-height:1.18;margin-top:1.5cqw}
.mc .by{margin-top:auto;font-size:3.8cqw;color:#dcdef7;font-weight:700}
.bundles{background:var(--soft)}
.bg{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:28px}
.bn{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px 24px;box-shadow:var(--sh);border-top:6px solid var(--c);position:relative;display:flex;flex-direction:column}
.bn.best{border:2px solid var(--gold);border-top:6px solid var(--gold);background:linear-gradient(180deg,#fffdf5,#fff)}
.bn .best-t{position:absolute;top:-13px;left:24px;background:var(--gold);color:var(--gold-ink);font-family:var(--disp);font-weight:800;font-size:11px;letter-spacing:.1em;text-transform:uppercase;padding:5px 13px;border-radius:20px}
.bn h3{font-size:20px}.bn .d{font-size:14px;color:var(--slate);margin:6px 0 16px;flex:1}
.bn .pr{display:flex;align-items:baseline;gap:10px;margin-bottom:16px}.bn .now{font-family:var(--disp);font-weight:800;font-size:34px}.bn .was{font-family:var(--mono);font-size:16px;color:var(--muted);text-decoration:line-through}
.bn .buy{font-family:var(--disp);font-weight:800;font-size:15px;color:#fff;text-align:center;padding:13px;border-radius:12px;background:var(--c)}.bn.best .buy{background:var(--gold);color:var(--gold-ink)}
.soon{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:28px}
.sc{border:2px dashed #cfdae8;border-radius:20px;padding:26px;background:#fff}.sc .b{display:inline-block;background:var(--blue);color:#fff;font-family:var(--disp);font-weight:700;font-size:11px;letter-spacing:.08em;text-transform:uppercase;padding:4px 11px;border-radius:20px}.sc h3{font-size:19px;margin:12px 0 6px}.sc p{font-size:14px;color:var(--slate)}
.news{background:var(--night);color:#fff;border-radius:24px;padding:46px 40px;text-align:center;position:relative;overflow:hidden}
.news h2{font-size:30px}.news p{color:#dcd9ee;margin:8px 0 22px}
.news form{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.news input{font-size:15px;padding:14px 18px;border-radius:12px;border:0;width:320px;max-width:80vw}
.news button{font-family:var(--disp);font-weight:800;font-size:15px;background:var(--gold);color:var(--gold-ink);border:0;padding:14px 26px;border-radius:12px;cursor:pointer}
.news button:disabled{opacity:.85;cursor:default}
.mlmsg{display:none;color:#bfe9c8;font-size:14px;margin-top:16px}
footer{background:#0d0b16;color:#b9b4d4;padding:52px 0 34px}
.fcols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px}
footer h4{font-family:var(--disp);font-weight:700;color:#fff;font-size:14px;margin-bottom:12px}footer a{display:block;color:#b9b4d4;font-size:14px;margin:7px 0}footer a:hover{color:#fff}
.fbot{border-top:1px solid rgba(255,255,255,.1);margin-top:34px;padding-top:20px;font-size:13px;color:#8a85a8;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
@media(max-width:900px){.feat,.bg,.soon{grid-template-columns:1fr 1fr}.fcols{grid-template-columns:1fr 1fr}.hero h1{font-size:42px}.links{display:none}.burger{display:block}.links.open{display:flex;position:absolute;top:64px;left:0;right:0;flex-direction:column;background:#fff;padding:16px 24px;border-bottom:1px solid var(--line);margin:0;gap:14px}.drop{width:100%}.dropbtn{font-family:var(--disp);font-weight:800;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.dropmenu{display:flex;position:static;box-shadow:none;border:0;padding:6px 0 0;min-width:0}.dropmenu a{padding:8px 8px}}
@media(max-width:560px){.feat,.bg,.soon,.fcols{grid-template-columns:1fr}.hero h1{font-size:34px}.sec h2{font-size:26px}}
.mc .aiwm{font-size:0;line-height:1;margin-top:4cqw;display:block}.mc .aiwm .wmai{display:block;font-weight:800;font-size:21cqw;line-height:.9;letter-spacing:.02em}.mc .aiwm .wmsub{display:block;font-weight:700;font-size:3.5cqw;letter-spacing:.1em;color:var(--c);filter:brightness(1.6) saturate(.9);margin-top:1.4cqw}.mc .aiwm .wmser{display:block;font-weight:800;font-size:5.8cqw;margin-top:2.6cqw}
/* ============================================================
   Rebuild additions. Everything above is ported unchanged from
   the one page site so the look does not drift.
   ============================================================ */

/* accessibility: the old site relied on browser defaults */
:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:4px}
@media(prefers-reduced-motion:reduce){
  *,*:before,*:after{animation-duration:.01ms !important;transition-duration:.01ms !important}
  html{scroll-behavior:auto}
  .bk:hover{transform:none}
}
.skip{position:absolute;left:-9999px;top:0;background:var(--blue);color:#fff;padding:10px 16px;
  border-radius:0 0 10px 0;font-family:var(--disp);font-weight:700;z-index:100}
.skip:focus{left:0}

/* breadcrumbs */
.crumb{font-size:13.5px;color:var(--muted);padding:18px 0 0;display:flex;flex-wrap:wrap;gap:6px}
.crumb a{color:var(--slate);font-weight:600}
.crumb a:hover{color:var(--blue)}
.crumb .sep{opacity:.5}

/* generic page head */
.phead{padding:26px 0 8px}
.phead h1{font-size:40px;line-height:1.08;margin:8px 0 0}
.phead .lead{font-size:17px;color:var(--slate);max-width:680px;margin-top:12px}
@media(max-width:560px){.phead h1{font-size:30px}}

/* book page hero */
.bhero{display:grid;grid-template-columns:340px 1fr;gap:44px;align-items:start;padding:22px 0 8px}
.bhero .mcw{border-radius:16px;overflow:hidden;box-shadow:var(--lift)}
.bhero h1{font-size:38px;line-height:1.1;margin:10px 0 0}
.bhero .lead{font-size:17px;color:var(--slate);margin-top:14px}
.bhero .eyebrow{font-family:var(--disp);font-weight:700;font-size:12px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--c)}
.buyrow{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:24px}
.buyrow .price{font-family:var(--mono);font-weight:700;font-size:30px}
.btn.buy{background:var(--c);color:#fff;font-size:15px;padding:14px 26px;border-radius:13px}
.btn.buy:hover{filter:brightness(1.08)}
.btn.soonbtn{background:#e7ecf3;color:#7d8fa2;cursor:default}
.altbuy{font-size:14px;color:var(--slate);margin-top:12px}
.altbuy a{color:var(--blue);font-weight:700}
@media(max-width:900px){.bhero{grid-template-columns:220px 1fr;gap:28px}.bhero h1{font-size:30px}}
@media(max-width:560px){.bhero{grid-template-columns:1fr}.bhero .mcw{max-width:220px}}

/* fact strip */
.strip{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:34px 0 0}
.strip div{background:var(--soft);border:1px solid var(--line);border-radius:14px;padding:14px 16px}
.strip b{display:block;font-family:var(--disp);font-size:14px}
.strip span{font-size:13px;color:var(--muted)}
@media(max-width:900px){.strip{grid-template-columns:1fr 1fr}}

/* prose blocks */
.prose{max-width:720px}
.prose h2{font-size:26px;margin:34px 0 10px}
.prose h3{font-size:19px;margin:24px 0 8px}
.prose p{margin:12px 0;color:var(--slate)}
.prose ul{margin:12px 0 12px 22px}
.prose li{margin:7px 0;color:var(--slate)}
.prose strong{color:var(--navy)}
.prose a{color:var(--blue);font-weight:600}

/* callout */
.note{background:var(--soft);border-left:4px solid var(--blue);border-radius:0 14px 14px 0;
  padding:16px 20px;margin:22px 0;font-size:15px;color:var(--slate)}
.note b{color:var(--navy)}

/* prev / next */
.pn{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:34px}
.pn a{border:1px solid var(--line);border-radius:14px;padding:16px 18px;background:#fff;
  box-shadow:var(--sh)}
.pn a:hover{border-color:var(--blue)}
.pn .k{font-family:var(--disp);font-weight:700;font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--muted)}
.pn .t{font-weight:700;font-size:15px;margin-top:5px}
.pn .nx{text-align:right}
@media(max-width:560px){.pn{grid-template-columns:1fr}.pn .nx{text-align:left}}

/* offer card, used on series and book pages */
.offer{border:2px solid var(--gold);background:linear-gradient(180deg,#fffdf5,#fff);
  border-radius:20px;padding:24px 26px;display:flex;align-items:center;gap:24px;flex-wrap:wrap;
  margin:28px 0}
.offer .txt{flex:1;min-width:240px}
.offer h3{font-size:20px}
.offer p{font-size:14.5px;color:var(--slate);margin-top:4px}
.offer .pr{font-family:var(--disp);font-weight:800;font-size:30px}
.offer .was{font-family:var(--mono);font-size:15px;color:var(--muted);text-decoration:line-through;
  margin-left:8px}

/* bundle contents list */
.inclist{margin-top:14px;border-top:1px solid var(--line)}
.inclist a{display:flex;align-items:center;gap:14px;padding:11px 4px;border-bottom:1px solid var(--line)}
.inclist a:hover{background:var(--soft)}
.inclist .n{font-family:var(--mono);font-size:12px;color:var(--muted);width:64px;flex:none}
.inclist .t{font-weight:600;font-size:15px;flex:1}
.inclist .p{font-family:var(--mono);font-size:13px;color:var(--muted)}

/* search */
.searchwrap{position:relative;margin-left:8px}
.searchbox{font-family:var(--body);font-size:14px;padding:8px 14px;border-radius:11px;
  border:1px solid var(--line);background:var(--soft);width:190px;color:var(--navy)}
.searchbox::placeholder{color:var(--muted)}
.results{display:none;position:absolute;top:42px;right:0;width:380px;max-width:86vw;background:#fff;
  border:1px solid var(--line);border-radius:14px;box-shadow:var(--lift);padding:8px;z-index:70;
  max-height:60vh;overflow:auto}
.results.open{display:block}
.results a{display:block;padding:9px 12px;border-radius:9px}
.results a:hover,.results a.sel{background:var(--soft)}
.results .t{font-weight:600;font-size:14.5px}
.results .m{font-size:12px;color:var(--muted);font-family:var(--mono)}
.results .none{padding:14px 12px;font-size:14px;color:var(--muted)}
@media(max-width:900px){.searchwrap{margin:0;width:100%}.searchbox{width:100%}
  .results{width:100%;right:auto;left:0}}

/* catalogue */
.count{font-family:var(--mono);font-size:13px;color:var(--muted);margin-top:10px}
.bk.hide{display:none}
.shead.hide{display:none}
.grid.hide{display:none}
.nores{display:none;padding:40px 0;color:var(--muted);font-size:16px}
.nores.on{display:block}

/* article */
.artmeta{font-family:var(--mono);font-size:13px;color:var(--muted);margin-top:10px}
.artlist{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;margin-top:24px}
.artcard{border:1px solid var(--line);border-radius:16px;padding:22px;background:#fff;
  box-shadow:var(--sh)}
.artcard:hover{box-shadow:var(--lift)}
.artcard h3{font-size:18px;margin-bottom:6px}
.artcard p{font-size:14px;color:var(--slate)}

/* series index cards */
.sgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;margin-top:24px}
.scard{border:1px solid var(--line);border-top:5px solid var(--c);border-radius:18px;padding:22px;
  background:#fff;box-shadow:var(--sh)}
.scard:hover{box-shadow:var(--lift)}
.scard .k{font-family:var(--disp);font-weight:700;font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--muted)}
.scard h3{font-size:19px;margin:8px 0 6px}
.scard p{font-size:14px;color:var(--slate)}
.scard .n{font-family:var(--mono);font-size:12.5px;color:var(--muted);margin-top:12px}

/* soon badge on a book page */
.soontag{display:inline-block;background:#e7ecf3;color:#61738a;font-family:var(--disp);
  font-weight:700;font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;
  padding:5px 12px;border-radius:20px}

/* 404 */
.big404{font-family:var(--disp);font-weight:800;font-size:96px;color:var(--line);line-height:1}

/* real cover art, used by the 27 Python books. Same shape as the CSS cover so
   a grid of the two mixed together lines up exactly. */
.mci{display:block;width:100%;height:auto;aspect-ratio:795/1123;object-fit:cover}

/* Code Clinic is Python. PYTHON sits above the wordmark, sized so CODE CLINIC
   stays the dominant line, and the block starts higher to absorb the extra row. */
.mc .wm.wmpy{margin-top:3.4cqw}
.mc .wm .wmpre{display:block;font-weight:700;font-size:5cqw;letter-spacing:.05em;
  line-height:1;margin-bottom:.7cqw;color:#e4e7ff}

/* ==========================================================
   Redesign: subjects first, and cheat sheets as a second product type
   ========================================================== */

/* a cheat sheet cover uses the same two line wordmark as the Python books */
.mc .wm.wm2{margin-top:3.4cqw}

/* mega menu, one column per subject */
.dropmenu.mega{min-width:820px;left:-60px;padding:16px 16px 12px;gap:4px 18px;
  grid-template-columns:repeat(4,1fr)}
.drop:hover .dropmenu.mega,.drop.open .dropmenu.mega{display:grid}
.mega .mcol{display:flex;flex-direction:column;gap:1px;min-width:0}
.mega .mh{font-family:var(--disp);font-weight:800;font-size:15px;color:var(--navy);
  border-bottom:2px solid var(--line);margin-bottom:4px}
.mega .mcol a{font-size:14px;padding:7px 10px}
.mega .msheet{color:var(--blue)}
.mega .mfoot{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:4px 16px;border-top:1px solid var(--line);
  margin-top:8px;padding-top:8px}
.mega .mfoot a{color:var(--blue);font-weight:700}
.newpill{display:inline-block;margin-left:6px;background:var(--gold);color:var(--gold-ink);
  font-family:var(--disp);font-weight:800;font-size:10px;letter-spacing:.06em;text-transform:uppercase;
  padding:2px 7px;border-radius:10px;vertical-align:2px}
@media(max-width:900px){
  .dropmenu.mega{display:grid;grid-template-columns:1fr 1fr;min-width:0;left:0;padding:6px 0 0}
  .mega .mfoot{grid-column:1/-1}
}
@media(max-width:560px){.dropmenu.mega{grid-template-columns:1fr}}

/* sheet card: same shape as a book card */
.bk .dchip{display:inline-block;margin-left:4px;border:1px solid currentColor;border-radius:8px;
  padding:0 6px;font-size:10px;letter-spacing:.04em}

/* bundle and pack cards */
.bn .kind{font-family:var(--mono);font-size:11px;font-weight:700;text-transform:uppercase;
  letter-spacing:.06em;color:var(--muted);margin-bottom:4px}
.bn .buy.soon{background:#e7ecf3;color:#7d8fa2;cursor:default}

/* section tints */
.sec.alt{background:var(--soft)}
.sechead{display:flex;align-items:end;justify-content:space-between;gap:20px;flex-wrap:wrap}
.sechead a.more{font-family:var(--disp);font-weight:700;color:var(--blue);font-size:15px}

/* subject tiles on the home page */
.subjects{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:28px}
.subj{border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:var(--sh);
  overflow:hidden;display:flex;flex-direction:column;transition:.15s}
.subj:hover{transform:translateY(-4px);box-shadow:var(--lift)}
.subj .fan{height:176px;background:var(--night);position:relative;overflow:hidden}
.subj .fan:before{content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 50% 0%,var(--c),transparent 70%);opacity:.55}
.subj .fanc{position:absolute;width:98px;border-radius:9px;overflow:hidden;
  box-shadow:0 14px 28px rgba(0,0,0,.55);outline:1px solid rgba(255,255,255,.14);outline-offset:-1px}
.subj .f0{left:calc(50% - 124px);transform:rotate(-10deg);bottom:-44px}
.subj .f1{left:calc(50% - 49px);z-index:2;bottom:-24px}
.subj .f2{left:calc(50% + 26px);transform:rotate(10deg);bottom:-44px}
.subj .st{padding:18px 20px 20px;flex:1;display:flex;flex-direction:column}
.subj h3{font-size:20px}
.subj p{font-size:14px;color:var(--slate);margin:6px 0 12px;flex:1}
.subj .n{font-family:var(--mono);font-size:12px;color:var(--muted)}
@media(max-width:900px){.subjects{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.subjects{grid-template-columns:1fr}}

/* two ways to learn */
.formats{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:28px}
.fmt{border:1px solid var(--line);border-radius:22px;padding:26px 26px 24px;background:#fff;
  box-shadow:var(--sh);display:flex;flex-direction:column}
.fmt .fk{font-family:var(--disp);font-weight:700;font-size:12px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--blue)}
.fmt h3{font-size:24px;margin:6px 0 10px}
.fmt ul{list-style:none;margin:4px 0 18px}
.fmt li{padding:6px 0 6px 26px;position:relative;color:var(--slate);font-size:15px}
.fmt li:before{content:"";position:absolute;left:0;top:11px;width:14px;height:14px;border-radius:4px;
  background:var(--blue);opacity:.9}
.fmt .fprev{margin-top:auto;display:grid;grid-template-columns:1fr 1fr;gap:10px}
.fmt .fprev img{width:100%;height:auto;display:block;border-radius:8px;border:1px solid var(--line);
  box-shadow:var(--sh)}
.fmt .fcovers{margin-top:auto;display:flex;gap:10px}
.fmt .fcovers .mcw{width:31%;border-radius:8px;overflow:hidden;box-shadow:var(--sh)}
.fmt .btn{align-self:flex-start;margin-top:18px}
@media(max-width:900px){.formats{grid-template-columns:1fr}}

/* the trust strip */
.trust{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:26px}
.trust div{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px 22px}
.trust b{display:block;font-family:var(--disp);font-size:16px;margin-bottom:6px}
.trust span{font-size:14px;color:var(--slate)}
@media(max-width:900px){.trust{grid-template-columns:1fr}}

/* subject hub: a learning path of series */
.path{display:grid;gap:14px;margin-top:22px}
.step{display:grid;grid-template-columns:52px 1fr auto;gap:18px;align-items:center;
  border:1px solid var(--line);border-radius:18px;padding:18px 22px;background:#fff;box-shadow:var(--sh)}
.step:hover{border-color:var(--c)}
.step .num{width:44px;height:44px;border-radius:12px;background:var(--c);color:#fff;
  font-family:var(--disp);font-weight:800;font-size:20px;display:grid;place-items:center}
.step h3{font-size:19px}
.step p{font-size:14px;color:var(--slate);margin-top:3px}
.step .n{font-family:var(--mono);font-size:13px;color:var(--muted);text-align:right;white-space:nowrap}
@media(max-width:560px){.step{grid-template-columns:44px 1fr}.step .n{grid-column:2;text-align:left}}

/* statline under a page head */
.stats{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.stats span{font-family:var(--mono);font-size:13px;background:var(--soft);border:1px solid var(--line);
  border-radius:20px;padding:5px 12px;color:var(--slate)}

/* cheat sheet page: see both real pages */
.preview{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:16px}
.preview figure{border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:var(--sh);
  background:#fff;margin:0}
.preview img{display:block;width:100%;height:auto}
.preview figcaption{font-size:13px;color:var(--muted);padding:8px 12px;border-top:1px solid var(--line)}
@media(max-width:560px){.preview{grid-template-columns:1fr}}
.sheetbits{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px;margin-top:14px}
.sheetbits div{border:1px solid var(--line);border-left:4px solid var(--c);border-radius:10px;
  padding:10px 14px;background:#fff;font-size:14px}
.sheetbits b{display:block;font-family:var(--disp);font-size:14px}
.sheetbits span{color:var(--muted);font-size:13px}
.dialect{display:inline-block;font-family:var(--disp);font-weight:800;font-size:12px;letter-spacing:.06em;
  border:2px solid var(--c);color:var(--c);border-radius:20px;padding:3px 11px;margin-left:8px;
  vertical-align:3px}

/* book page: revise it in two pages */
.revise{display:flex;gap:20px;align-items:center;border:2px solid var(--c);border-radius:20px;
  padding:18px 22px;margin:26px 0;background:#fff;flex-wrap:wrap}
.revise .mcw{width:88px;flex:none;border-radius:8px;overflow:hidden;box-shadow:var(--sh)}
.revise .txt{flex:1;min-width:220px}
.revise .k{font-family:var(--disp);font-weight:700;font-size:11px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--c)}
.revise h3{font-size:19px;margin:4px 0}
.revise p{font-size:14px;color:var(--slate)}

/* The ported one-pager stylesheet has a .soon rule that makes an element a
   three column grid (it was the old coming-soon section). Buttons also use
   .soon, so pin their display explicitly. */
.bk .buy.soon{display:inline-block;margin-top:0;gap:0}
.bn .buy.soon{display:block;margin-top:0;gap:0;text-align:center}