:root{--b-econ:url("banners/econ.webp");--b-ocm:url("banners/ocm.webp");--b-sp:url("banners/sp.webp");--b-bk:url("banners/bk.webp")}
:root{--mascot:url("mascot.webp")}
:root{
  --bg:#f3f6fb; --card:#ffffff; --text:#14213d; --muted:#586180; --line:#dfe5f2;
  --brand:#0b7a72; --on-brand:#ffffff; --brand-soft:#e2f4f2; --gold:#ffb627;
  --ok:#15803d; --ok-bg:#e3f5e9; --bad:#c2261f; --bad-bg:#fdeceb;
  --hero-a:#14213d; --hero-b:#0f6f69;
  --shadow:0 1px 2px rgba(20,33,61,.06),0 8px 24px rgba(20,33,61,.07);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0b1222; --card:#141d33; --text:#eaf0ff; --muted:#9fabc9; --line:#25314f;
    --brand:#3ccfc2; --on-brand:#06201d; --brand-soft:#123033;
    --ok:#6fd08c; --ok-bg:#12301f; --bad:#ff8a80; --bad-bg:#3a1a1a;
    --hero-a:#101a33; --hero-b:#0d5a56; --shadow:0 8px 24px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"]{
  --bg:#0b1222; --card:#141d33; --text:#eaf0ff; --muted:#9fabc9; --line:#25314f;
  --brand:#3ccfc2; --on-brand:#06201d; --brand-soft:#123033;
  --ok:#6fd08c; --ok-bg:#12301f; --bad:#ff8a80; --bad-bg:#3a1a1a;
  --hero-a:#101a33; --hero-b:#0d5a56; --shadow:0 8px 24px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
body{margin:0;font-family:Figtree,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
h1,h2,h3,.brand{font-family:"Bricolage Grotesque",Figtree,system-ui,sans-serif}
h2,h3{text-wrap:balance}

/* header */
.top{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;padding:10px 20px;background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;color:var(--text);text-decoration:none}
.brand em{font-style:normal;color:var(--brand)}
.logo{flex:none;width:38px;height:38px;display:block}
.top-actions{display:flex;gap:6px}
button{font:inherit;cursor:pointer;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--text);padding:8px 14px;transition:transform .12s,border-color .12s,background .12s}
button:hover{border-color:var(--brand)}
button:active{transform:scale(.98)}
button:disabled{opacity:.55;cursor:not-allowed}button:disabled:hover{border-color:var(--line)}
.vid{margin:6px 0 4px;border-radius:14px;overflow:hidden;background:#000;border:1px solid var(--line)}
.vid video{display:block;width:100%;height:auto;aspect-ratio:16/9;background:#000}
.vid-cap{margin:6px 0 0;color:var(--muted);font-size:.85rem}
button:focus-visible,select:focus-visible,input:focus-visible,li:focus-visible,textarea:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
.tab.active,.primary{background:var(--brand);color:var(--on-brand);border-color:var(--brand);font-weight:600}
.icon{padding:8px 11px}

/* hero */
.hero{display:flex;align-items:center;justify-content:space-between;gap:24px;max-width:1100px;margin:16px auto 0;padding:28px 32px;border-radius:24px;color:#fff;background:linear-gradient(120deg,var(--hero-a),var(--hero-b));overflow:hidden;position:relative}
.hero-text{max-width:460px;position:relative;z-index:1}
.hero h1{font-size:clamp(1.7rem,4.5vw,2.6rem);line-height:1.1;margin:6px 0 10px;font-weight:800;text-wrap:balance}
.hero p{margin:0;color:#d5e3f0}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.75rem;font-weight:600;color:#ffb627!important}
.hero-art{width:min(420px,44%);height:auto;flex:none}

.layout{display:grid;grid-template-columns:300px 1fr;gap:20px;max-width:1100px;margin:20px auto;padding:0 16px}
.side,.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:var(--shadow)}
.side{align-self:start}
.cap{display:block;font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin:16px 0 8px;font-family:Figtree,sans-serif;font-weight:600}

/* class switch */
.seg{display:grid;grid-template-columns:1fr 1fr;background:var(--bg);border-radius:12px;padding:4px;gap:4px}
.seg button{border:0;background:transparent;font-weight:600;color:var(--muted)}
.seg button.on{background:var(--card);color:var(--text);box-shadow:var(--shadow)}

/* subject tiles */
.subjects{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.tile{display:flex;flex-direction:column;align-items:flex-start;gap:6px;text-align:left;padding:12px;border-radius:14px;line-height:1.25}
.tile b{font-size:.88rem}
.tile small{color:var(--muted);font-size:.74rem}
.tile.on{border-color:var(--sc);background:color-mix(in srgb,var(--sc) 12%,var(--card))}
.ico{display:grid;place-items:center;width:38px;height:38px;border-radius:11px;background:color-mix(in srgb,var(--sc) 18%,var(--card));color:var(--sc)}
.ico svg{width:22px;height:22px}

input[type=search]{width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--text);font:inherit}
.chapters{list-style:none;margin:10px 0 0;padding:0;display:grid;gap:4px}
.chapters li{padding:9px 10px;border-radius:12px;cursor:pointer;display:flex;align-items:center;gap:10px}
.chapters li:hover{background:var(--bg)}
.chapters li.active{background:color-mix(in srgb,var(--sc,var(--brand)) 14%,var(--card));font-weight:600}
.num{flex:none;display:grid;place-items:center;width:26px;height:26px;border-radius:8px;background:var(--bg);font-size:.8rem;font-weight:600;font-variant-numeric:tabular-nums}
.chapters li.active .num{background:var(--sc,var(--brand));color:#fff}
.chapters .t{flex:1;font-size:.92rem}
.tag{color:var(--ok);font-weight:700}

/* study */
.banner{display:flex;align-items:center;gap:16px;padding:20px;border-radius:18px;margin-bottom:16px;color:#fff;background:linear-gradient(120deg,color-mix(in srgb,var(--sc) 85%,#0b1222),color-mix(in srgb,var(--sc) 55%,#0b1222))}
.banner .ico{width:56px;height:56px;border-radius:16px;background:rgba(255,255,255,.18);color:#fff;flex:none}
.banner .ico svg{width:30px;height:30px}
.banner small{opacity:.85;letter-spacing:.04em}
.banner h2{margin:2px 0 0;font-size:1.5rem;line-height:1.2}
h3{margin:22px 0 8px;font-size:1.05rem}
.lead{color:var(--muted);font-size:1.02rem}
.concepts{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px}
.concept{padding:14px;border-radius:14px;background:color-mix(in srgb,var(--sc,var(--brand)) 9%,var(--card));border:1px solid color-mix(in srgb,var(--sc,var(--brand)) 22%,var(--line))}
.concept b{display:block;margin-bottom:4px;color:var(--sc,var(--brand));font-size:.8rem;text-transform:uppercase;letter-spacing:.06em}
.revise{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.revise li{display:flex;gap:10px}
.revise li::before{content:"";flex:none;width:8px;height:8px;margin-top:.55em;border-radius:50%;background:var(--gold)}
.row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:14px 0}
.best{background:var(--brand-soft);color:var(--brand);padding:6px 12px;border-radius:99px;font-weight:600;font-size:.85rem}
textarea{width:100%;min-height:80px;padding:10px;border-radius:12px;border:1px solid var(--line);background:var(--bg);color:var(--text);font:inherit}

/* quiz */
.opts{display:grid;gap:8px;margin:14px 0}
.opt{display:flex;align-items:center;gap:12px;text-align:left;padding:12px 14px;border-radius:14px}
.opt i{flex:none;display:grid;place-items:center;width:28px;height:28px;border-radius:8px;background:var(--bg);font-style:normal;font-weight:600;font-size:.85rem}
.opt.right{background:var(--ok-bg);border-color:var(--ok)}
.opt.wrong{background:var(--bad-bg);border-color:var(--bad)}
.bar{height:8px;background:var(--line);border-radius:99px;overflow:hidden}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--gold));border-radius:99px}
.expl{padding:12px;border-radius:12px;background:var(--brand-soft);margin-top:8px}
.meta{display:flex;justify-content:space-between;color:var(--muted);font-size:.9rem;margin-bottom:8px}
.score{font-family:"Bricolage Grotesque",sans-serif;font-size:3rem;font-weight:800;color:var(--brand);line-height:1.1}
.wrong-item{padding:12px;border-radius:12px;background:var(--bad-bg);margin:8px 0}

.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse}
th,td{padding:9px 8px;border-bottom:1px solid var(--line);text-align:left}
footer{text-align:center;color:var(--muted);font-size:.8rem;padding:20px 16px}

/* sign in dialog */
dialog{width:min(380px,calc(100% - 32px));border:1px solid var(--line);border-radius:18px;padding:22px;background:var(--card);color:var(--text);box-shadow:var(--shadow)}
dialog::backdrop{background:rgba(8,14,30,.55)}
dialog h2{margin:0 0 12px}
dialog label{display:block;font-size:.85rem;color:var(--muted);margin:10px 0 4px}
dialog input{width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--text);font:inherit}
.pin-mask{-webkit-text-security:disc;text-security:disc;letter-spacing:.2em}

/* welcome / login page */
.welcome{position:fixed;inset:0;z-index:200;display:grid;place-items:center;padding:20px;overflow:auto;background:radial-gradient(900px 500px at 15% -10%,var(--hero-b,#0d5a56),transparent 60%),linear-gradient(160deg,var(--hero-a,#101a33),var(--bg))}
.welcome[hidden]{display:none}
body.welcome-open{overflow:hidden}
.w-card{width:min(460px,100%);margin:auto;padding:26px 26px 22px;border-radius:24px;background:var(--card);color:var(--text);box-shadow:0 24px 60px rgba(0,0,0,.4);text-align:center}
.w-mascot{width:min(150px,40%);aspect-ratio:1;margin:0 auto 14px;border-radius:24px;background:var(--mascot) center/cover no-repeat;border:3px solid #ffc23a;box-shadow:0 10px 28px rgba(0,0,0,.25)}
.w-eyebrow{margin:0;text-transform:uppercase;letter-spacing:.08em;font-size:.72rem;font-weight:700;color:var(--brand)}
.w-card h1{font-size:clamp(1.5rem,5.5vw,1.95rem);line-height:1.15;margin:6px 0 10px;font-weight:800;text-wrap:balance}
.w-card h1 em{font-style:normal;color:var(--brand)}
.w-brief{margin:0 0 8px;color:var(--muted);line-height:1.5;font-size:.95rem}
#wForm{text-align:left;margin-top:14px;padding-top:6px;border-top:1px solid var(--line)}
#wForm h2{font-size:1.05rem;margin:12px 0 2px}
.welcome label{display:block;font-size:.85rem;color:var(--muted);margin:10px 0 4px}
.welcome input{width:100%;padding:11px 12px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--text);font:inherit}
.w-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.w-row button{flex:1 1 140px}
.w-card .auth-msg{min-height:1.3em}
.w-seq{opacity:0;animation:wIn .5s ease forwards;animation-delay:calc(var(--i,0)*90ms)}
@keyframes wIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){.w-seq{opacity:1;animation:none}}
.auth-msg{min-height:1.2em;margin:8px 0 0;color:var(--bad);font-size:.88rem}
.link{border:0;background:none;color:var(--brand);padding:4px 0;text-decoration:underline}
.note{color:var(--muted);font-size:.78rem;margin:10px 0 0}

@media(max-width:820px){
  .layout{grid-template-columns:1fr}
  .hero{flex-direction:column;align-items:flex-start;padding:22px 20px;margin:12px 16px 0}
  .hero-art{width:100%;max-width:340px;align-self:center}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}

/* mascot */
.mascot-img{flex:none;width:min(230px,28%);aspect-ratio:1;border-radius:24px;background:var(--mascot) center/cover no-repeat;box-shadow:0 14px 40px rgba(0,0,0,.35);border:3px solid rgba(255,255,255,.25)}
.logo-face{flex:none;display:block;width:42px;height:42px;border-radius:50%;background:var(--mascot) 56% 30%/290% no-repeat;border:2px solid #ffc23a}
@media(max-width:820px){.mascot-img{width:min(150px,40%);align-self:center}}
/* concept pop-up */
button.concept{display:block;width:100%;text-align:left;font:inherit;cursor:pointer;color:var(--text);transition:transform .12s,box-shadow .12s}
button.concept:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.concept .more{display:block;margin-top:8px;font-size:.78rem;font-weight:600;color:var(--sc,var(--brand))}
dialog.wide{width:min(720px,calc(100% - 24px));max-height:88vh;overflow:auto}
.c-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.c-head h2{margin:2px 0 8px;font-size:1.4rem}
.c-sub{margin:0;color:var(--muted);font-size:.8rem;text-transform:uppercase;letter-spacing:.06em}
.c-h{display:flex;align-items:center;gap:10px;margin:16px 0 6px;font-size:1rem}
.pill{background:var(--brand-soft);color:var(--brand);padding:2px 10px;border-radius:99px;font-size:.75rem;font-weight:600}
.book-text{white-space:pre-line;background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:14px;line-height:1.7;font-size:.95rem}

/* tables in concept pop-up */
dialog.wide{width:min(860px,calc(100% - 24px))}
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px}
.ctbl{width:100%;border-collapse:collapse;font-size:.9rem;line-height:1.45}
.ctbl th{background:var(--brand-soft);color:var(--text);text-align:left;padding:9px 10px;font-weight:700;white-space:nowrap}
.ctbl td{padding:8px 10px;border-top:1px solid var(--line);vertical-align:top;min-width:110px}
.ctbl tbody tr:nth-child(even) td{background:color-mix(in srgb,var(--bg) 70%,var(--card))}
.ctbl td:first-child{font-weight:600}

/* chapter map */
.omap,.omap-sub{list-style:none;margin:0;padding:0}
.omap{display:grid;gap:10px}
.omap>li{padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:color-mix(in srgb,var(--sc,var(--brand)) 5%,var(--card))}
.omap>li>b{color:var(--sc,var(--brand))}
.omap b{font-weight:700}
.omap span{color:var(--text)}
.omap-sub{margin-top:8px;padding-left:12px;border-left:2px solid color-mix(in srgb,var(--sc,var(--brand)) 35%,var(--line));display:grid;gap:6px}
.omap-sub li{font-size:.92rem;line-height:1.5}
.omap-sub li b{font-weight:600}

/* subject photo banners */
.banner{min-height:190px;background-image:linear-gradient(100deg,rgba(6,12,28,.88) 0%,rgba(6,12,28,.62) 42%,rgba(6,12,28,.06) 100%),var(--bimg,none),linear-gradient(120deg,color-mix(in srgb,var(--sc) 85%,#0b1222),color-mix(in srgb,var(--sc) 55%,#0b1222));background-size:cover;background-position:center;box-shadow:var(--shadow)}
.banner h2,.banner small{text-shadow:0 2px 12px rgba(0,0,0,.55)}
.banner>div{max-width:min(640px,100%)}
/* Ask StudyRaah: free offline helper */
.sbq-fab{position:fixed;right:18px;bottom:18px;z-index:60;display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border:0;border-radius:999px;font:inherit;font-weight:700;color:var(--on-brand);background:linear-gradient(135deg,var(--hero-b),var(--brand));box-shadow:var(--shadow);cursor:pointer}
.sbq-fab:hover{filter:brightness(1.07)}
.sbq-fab-ico{display:grid;place-items:center;width:22px;height:22px;border-radius:50%;background:rgba(255,255,255,.28);font-weight:800}
.sbq-panel{position:fixed;right:18px;bottom:84px;z-index:61;display:flex;flex-direction:column;width:min(400px,calc(100vw - 32px));height:min(600px,calc(100vh - 110px));background:var(--card);color:var(--text);border:1px solid var(--line);border-radius:18px;box-shadow:0 18px 50px rgba(0,0,0,.3);overflow:hidden}
.sbq-panel[hidden]{display:none}
.sbq-head{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:12px 14px;color:#fff;background:linear-gradient(120deg,var(--hero-a),var(--hero-b))}
.sbq-title strong{display:block;font-family:"Bricolage Grotesque",Figtree,sans-serif}
.sbq-title span{font-size:.78rem;opacity:.85}
.sbq-close{border:0;background:transparent;color:#fff;font-size:1rem;padding:6px 8px;border-radius:8px}
.sbq-log{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:10px;font-size:.92rem}
.sbq-msg{padding:10px 12px;border-radius:14px;line-height:1.5;max-width:100%}
.sbq-user{align-self:flex-end;background:var(--brand);color:var(--on-brand);border-bottom-right-radius:4px;max-width:88%;white-space:pre-wrap}
.sbq-bot{background:var(--bg);border:1px solid var(--line);border-bottom-left-radius:4px}
.sbq-bot p{margin:0 0 8px}.sbq-bot p:last-child{margin-bottom:0}
.sbq-list{margin:0 0 8px;padding-left:18px}.sbq-list li{margin-bottom:4px}
.sbq-src{font-size:.78rem;color:var(--muted)}
.sbq-acts,.sbq-chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.sbq-act,.sbq-chip{padding:6px 10px;border-radius:999px;font-size:.8rem;border:1px solid var(--line);background:var(--card);color:var(--text);cursor:pointer}
.sbq-act{color:var(--brand);font-weight:600}
.sbq-form{display:flex;gap:8px;padding:10px 12px 0;border-top:1px solid var(--line)}
.sbq-form textarea{flex:1;resize:none;padding:9px 11px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--text);font:inherit}
.sbq-send{align-self:flex-end;padding:9px 14px;border:0;border-radius:12px;background:var(--brand);color:var(--on-brand);font-weight:700;cursor:pointer}
.sbq-foot{margin:6px 12px 10px;font-size:.72rem;color:var(--muted)}
.sbq-tbl{margin:6px 0}
@media(max-width:640px){.sbq-fab-txt{display:none}.sbq-fab{padding:12px}.sbq-panel{inset:0;width:100%;height:100%;border-radius:0;border:0}}

/* downloads tab: one-pager list */
.dl-group{margin-top:16px}
.dl-group h3{display:flex;align-items:center;gap:10px;margin:0 0 10px}
.dl-group h3 .ico{width:32px;height:32px;color:var(--sc,var(--brand));background:color-mix(in srgb,var(--sc,var(--brand)) 16%,var(--card))}
.dl-group h3 .ico svg{width:18px;height:18px}
.dl-list{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.dl-list li{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:12px;background:color-mix(in srgb,var(--sc,var(--brand)) 5%,var(--card));border:1px solid var(--line)}
.dl-list .t{flex:1;font-size:.94rem}
.dl-btn{white-space:nowrap;font-size:.85rem;padding:7px 12px;color:var(--sc,var(--brand));border-color:color-mix(in srgb,var(--sc,var(--brand)) 40%,var(--line))}
.dl-btn:hover{background:color-mix(in srgb,var(--sc,var(--brand)) 12%,var(--card))}

/* one-pager: hidden on screen, shown only when printing */
#printArea{display:none}
@media print{
  body.printing>*:not(#printArea){display:none!important}
  body.printing #printArea{display:block!important}
  @page{size:A4;margin:0}
}
.op-page{font-family:Figtree,system-ui,sans-serif;color:#1c2333;background:#f7f3ea;background-image:radial-gradient(circle,#00000010 1px,transparent 1px);background-size:14px 14px;padding:14mm 13mm;box-sizing:border-box;min-height:100%}
.op-head2{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;border-bottom:4px solid var(--sc,#0b7a72);padding-bottom:10px;margin-bottom:12px}
.op-eyebrow{margin:0;text-transform:uppercase;letter-spacing:.08em;font-weight:700;font-size:.7rem;color:var(--sc,#0b7a72)}
.op-head2 h1{margin:3px 0 4px;font-family:"Bricolage Grotesque",Figtree,sans-serif;font-size:1.55rem;color:#1c2333}
.op-sub{margin:0;font-size:.82rem;color:#5b6472}
.op-head-right{flex:none;display:flex;align-items:center;gap:8px}
.op-icon2{flex:none;display:grid;place-items:center;width:42px;height:42px;border-radius:11px;background:color-mix(in srgb,var(--sc,#0b7a72) 16%,#fff);color:var(--sc,#0b7a72)}
.op-icon2 svg{width:22px;height:22px}
.op-pages-badge{background:var(--sc,#0b7a72);color:#fff;font-weight:700;font-size:.66rem;line-height:1.3;text-align:center;padding:5px 10px;border-radius:9px;white-space:nowrap}
.op-callout{display:flex;gap:12px;align-items:flex-start;padding:10px 13px;border-radius:9px;margin:10px 0;font-size:.82rem;line-height:1.5;break-inside:avoid}
.op-callout .op-tag{flex:none;width:58px;font-weight:800;font-size:.62rem;letter-spacing:.04em;text-transform:uppercase;line-height:1.25}
.op-remember{background:#fbeed7;border-left:5px solid #e08a2c;color:#4a2f0a}
.op-remember .op-tag{color:#b4590a}
.op-keyfacts{background:color-mix(in srgb,var(--sc,#0b7a72) 12%,#fff);border-left:5px solid var(--sc,#0b7a72)}
.op-keyfacts .op-tag{color:var(--sc,#0b7a72)}
.op-section{margin:12px 0;break-inside:avoid}
.op-sec-head{display:flex;align-items:center;gap:9px;margin-bottom:5px}
.op-badge{flex:none;background:var(--sc,#0b7a72);color:#fff;font-weight:800;font-size:.72rem;padding:3px 9px;border-radius:7px}
.op-sec-head h2{margin:0;font-family:"Bricolage Grotesque",Figtree,sans-serif;font-size:.98rem;color:#1c2333}
.op-sec-desc{margin:0 0 7px;font-size:.8rem;color:#5b6472;line-height:1.45}
.op-cards{display:grid;grid-template-columns:1fr 1fr;gap:7px}
.op-card{background:#fff;border:1px solid #e7e2d5;border-left:4px solid var(--sc,#0b7a72);border-radius:8px;padding:8px 10px;break-inside:avoid}
.op-card b{display:block;font-size:.78rem;margin-bottom:2px;color:#1c2333}
.op-card span{display:block;font-size:.73rem;color:#5b6472;line-height:1.4}
.op-num{display:inline-block;margin-right:6px;color:var(--sc,#0b7a72);font-weight:800}
.op-tbl-wrap{margin:10px 0;break-inside:avoid}
.op-tbl-title{margin:0 0 5px;font-weight:700;font-size:.82rem;color:var(--sc,#0b7a72)}
table.op-table{width:100%;border-collapse:collapse;font-size:.72rem}
table.op-table th{background:#1c2333;color:#fff;text-align:left;padding:5px 7px;font-weight:600}
table.op-table td{padding:5px 7px;border-bottom:1px solid #e7e2d5}
table.op-table tr:nth-child(even) td{background:#f0ece0}
.op-foot2{display:flex;justify-content:space-between;gap:10px;margin-top:12px;padding-top:7px;border-top:1px solid #e7e2d5;font-size:.66rem;color:#5b6472}
.op-brand{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.op-logo-full{height:58px;width:auto;display:block}
.op-logo{width:30px;height:30px;border-radius:50%;border:2px solid #ffc23a;display:block}
.op-word{font-family:"Bricolage Grotesque",Figtree,sans-serif;font-weight:800;font-size:1rem;color:#1c2333}
.op-word em{font-style:normal;color:#0b7a72}
.op-brand-sub{margin-left:auto;font-size:.62rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:#5b6472}
.op-mascot{width:66px;height:66px;border-radius:14px;border:3px solid #ffc23a;display:block}
.op-foot-brand{display:inline-flex;align-items:center;gap:6px;font-weight:700;color:#1c2333}
.op-foot-brand img{width:18px;height:18px;display:block}
/* one-pager graphics: roadmap, story-line and diagrams */
.op-gtitle{margin:0 0 6px;font-weight:800;font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;color:var(--sc,#0b7a72)}
.op-roadmap{margin:10px 0 12px;break-inside:avoid}
.op-roadmap ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px 0;position:relative}
.op-roadmap li{flex:1 1 0;min-width:72px;display:flex;flex-direction:column;align-items:center;text-align:center;position:relative;padding:0 3px}
.op-roadmap li::before{content:"";position:absolute;top:12px;left:-50%;width:100%;height:3px;background:color-mix(in srgb,var(--sc,#0b7a72) 35%,#fff);z-index:0}
.op-roadmap li:first-child::before{display:none}
.op-rm-dot{position:relative;z-index:1;width:25px;height:25px;border-radius:50%;background:var(--sc,#0b7a72);color:#fff;font-weight:800;font-size:.7rem;display:grid;place-items:center;border:3px solid #f7f3ea}
.op-rm-t{margin-top:3px;font-size:.6rem;line-height:1.2;color:#3b4252;font-weight:600}
.op-story{display:flex;gap:12px;align-items:flex-start;background:#fff;border:2px dashed color-mix(in srgb,var(--sc,#0b7a72) 55%,#fff);border-radius:14px;padding:11px 13px;margin:10px 0;break-inside:avoid}
.op-story-av{flex:none;width:54px;height:54px;border-radius:50%;background:color-mix(in srgb,var(--sc,#0b7a72) 18%,#fff);padding:3px}
.op-story-av svg{width:100%;height:100%;display:block}
.op-story-k{margin:0;font-size:.62rem;font-weight:800;letter-spacing:.05em;text-transform:uppercase;color:#b4590a}
.op-story h3{margin:1px 0 4px;font-family:"Bricolage Grotesque",Figtree,sans-serif;font-size:.98rem;color:#1c2333}
.op-story-body p:not(.op-story-k){margin:0 0 5px;font-size:.78rem;line-height:1.5;color:#2f3646}
.op-graphics{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:8px 0 12px}
.op-graphic{background:#fff;border:1px solid #e7e2d5;border-radius:12px;padding:9px 11px;break-inside:avoid}
.op-graphics .op-graphic:only-child,.op-graphic:has(.op-chain),.op-graphic:has(.op-jr){grid-column:1/-1}
.op-chain{display:flex;flex-wrap:wrap;align-items:center;gap:5px}
.op-step{display:inline-flex;align-items:center;gap:5px;background:color-mix(in srgb,var(--sc,#0b7a72) 12%,#fff);border:1px solid color-mix(in srgb,var(--sc,#0b7a72) 35%,#fff);border-radius:999px;padding:4px 10px 4px 4px;font-size:.72rem;font-weight:600;color:#1c2333}
.op-step small{display:grid;place-items:center;width:18px;height:18px;border-radius:50%;background:var(--sc,#0b7a72);color:#fff;font-size:.6rem;font-weight:800}
.op-arrow{color:var(--sc,#0b7a72);font-weight:800}
.op-split{display:grid;grid-template-columns:1fr auto 1fr;gap:8px;align-items:stretch}
.op-split>div{background:#f7f3ea;border-radius:9px;padding:6px 9px}
.op-split>div:last-child{background:color-mix(in srgb,var(--sc,#0b7a72) 10%,#fff)}
.op-split b{font-size:.76rem;color:#1c2333}
.op-split ul{margin:3px 0 0;padding-left:15px;font-size:.7rem;line-height:1.45;color:#3b4252}
.op-vs{align-self:center;font-weight:800;font-size:.72rem;color:#b4590a}
.op-eq{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:8px;padding:6px 0}
.op-term{background:var(--sc,#0b7a72);color:#fff;font-weight:700;font-size:.8rem;border-radius:9px;padding:7px 12px}
.op-op{font-size:1.2rem;font-weight:800;color:#b4590a}
table.op-jr{width:100%;border-collapse:collapse;font-size:.7rem}
table.op-jr th{background:#1c2333;color:#fff;text-align:left;padding:4px 6px}
table.op-jr td{padding:4px 6px;border-bottom:1px solid #e7e2d5;vertical-align:top}
table.op-jr td i{color:#5b6472}
table.op-jr td:nth-child(3),table.op-jr td:nth-child(4),table.op-jr th:nth-child(3),table.op-jr th:nth-child(4){text-align:right;white-space:nowrap}
.op-graphics{grid-template-columns:1fr}
@media print{html,body.printing{background:#f7f3ea!important}body.printing #printArea{background:#f7f3ea}}
.op-foot2{break-before:avoid;break-inside:avoid}
.op-keyfacts{break-after:avoid}

/* Gen Z one-pager: bold header band, stickers, quote cards */
.op-page{background:#fbf8f2;background-image:radial-gradient(circle,#0000000d 1px,transparent 1px);background-size:16px 16px}
.op-head2{background:linear-gradient(120deg,var(--sc,#0b7a72),color-mix(in srgb,var(--sc,#0b7a72) 55%,#7c3aed));border:0;border-radius:18px;padding:14px 16px;color:#fff;margin-bottom:14px}
.op-head2 .op-eyebrow{display:inline-block;background:#ffffff2e;color:#fff;border-radius:999px;padding:3px 10px;letter-spacing:.06em}
.op-head2 h1{color:#fff;font-size:1.75rem;letter-spacing:-.01em;margin:6px 0 3px}
.op-head2 .op-sub{color:#ffffffd9}
.op-head2 .op-mascot{border:3px solid #fff;border-radius:16px}
.op-pages-badge{background:#fff;color:var(--sc,#0b7a72);box-shadow:0 2px 0 #00000026}
.op-callout{border-radius:14px}
.op-remember{background:#fff3c4;border-left:0;border:2px solid #f5c542;color:#3d2c00}
.op-remember .op-tag{background:#1c2333;color:#ffe066;border-radius:8px;padding:4px 7px;width:auto;transform:rotate(-3deg);white-space:nowrap}
.op-keyfacts{border-left:0;border:2px solid color-mix(in srgb,var(--sc,#0b7a72) 45%,#fff)}
.op-keyfacts .op-tag{background:var(--sc,#0b7a72);color:#fff;border-radius:8px;padding:4px 7px;width:auto;transform:rotate(-2deg);white-space:nowrap}
.op-badge{border-radius:999px;padding:3px 10px}
.op-card{border-radius:12px;border-left-width:5px}
.op-gtitle span{text-transform:none;letter-spacing:0;font-weight:600;color:#8a6d1f}
.op-defs{margin:10px 0 12px;break-inside:avoid}
.op-def{position:relative;background:#fff;border:2px solid #1c2333;border-radius:14px;padding:9px 12px 8px 34px;margin:0 0 7px;box-shadow:3px 3px 0 color-mix(in srgb,var(--sc,#0b7a72) 70%,#fff);break-inside:avoid}
.op-qm{position:absolute;left:9px;top:-2px;font-family:Georgia,serif;font-size:2.1rem;font-weight:700;color:var(--sc,#0b7a72);line-height:1}
.op-def p{margin:0;font-size:.79rem;line-height:1.45;color:#1c2333;font-weight:600}
.op-def cite{display:block;margin-top:3px;font-style:normal;font-size:.68rem;font-weight:700;color:var(--sc,#0b7a72)}
.op-story{border-style:solid;border-width:2px;border-color:#1c2333;box-shadow:4px 4px 0 #f5c542}
.op-step{border-width:2px}
.op-foot-brand{font-weight:700}
/* chapter page: textbook definition cards */
.tdefs{display:grid;gap:10px;margin:6px 0 14px}
.tdef{margin:0;padding:12px 14px 10px 16px;border-radius:14px;background:color-mix(in srgb,var(--sc,#0b7a72) 9%,var(--card));border-left:5px solid var(--sc,#0b7a72)}
.tdef p{margin:0;font-weight:600;line-height:1.55}
.tdef cite{display:block;margin-top:6px;font-style:normal;font-size:.85rem;font-weight:700;color:var(--sc,#0b7a72)}
.tdef cite::before{content:"\2014  "}

.op-sec-desc.op-q,.op-card-q span{color:#1c2333!important;font-weight:600;font-style:italic}
.op-card-q{border-left-color:#f5c542!important}
.omap span.tq{font-weight:600;font-style:italic}

/* sign-in page: bigger on laptops and desktops (phones and tablets unchanged) -
   two columns so it stays on one screen: mascot and welcome on the left, the sign-in form on the right */
@media (min-width:900px){
  .w-card{width:min(1000px,100%);padding:40px 48px 34px;border-radius:28px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);grid-template-rows:minmax(0,56px) auto auto auto auto auto 1fr;column-gap:48px}
  .w-card>*{grid-column:1}
  .w-card>.w-mascot{grid-row:2;width:220px;margin:0 auto 20px;border-radius:30px}
  .w-card>.w-eyebrow{grid-row:3;font-size:.82rem}
  .w-card>h1{grid-row:4;font-size:2.5rem;margin:8px 0 14px}
  .w-card>.w-brief:nth-child(4){grid-row:5}
  .w-card>.w-brief:nth-child(5){grid-row:6}
  .w-brief{font-size:1.08rem}
  .w-card>#wForm{grid-column:2;grid-row:1 / -1;align-self:start;margin:0;padding:0 0 0 48px;border-top:0;border-left:1px solid var(--line)}
  #wForm h2{font-size:1.3rem}
  .welcome label{font-size:.95rem}
  .welcome input{padding:14px 16px;font-size:1.05rem}
  .w-row button{padding:13px 18px;font-size:1.05rem}
}