/* InteracBook — site styles
   Design idea: the school notebook. Ruled paper, a red margin line, blue ink,
   a yellow highlighter, and one green chalkboard section.
   Brand indigo (#585FED) comes from the existing InteracBook logo. */

:root{
  --paper:#FCFCFB;
  --paper-2:#F1F3FC;
  --rule:#DCE3F7;
  --line:#E2E6F3;
  --ink:#171B3B;
  --mute:#565C7E;
  --indigo:#585FED;
  --indigo-deep:#3A40C2;
  --margin:#D93A46;
  --hi:#FFE566;
  --chalk-bg:#12362E;
  --chalk:#EEF3EA;
  --chalk-mute:#B6CCBE;
  --ui:'Bricolage Grotesque',system-ui,-apple-system,'Segoe UI',sans-serif;
  --read:'Literata',Georgia,'Times New Roman',serif;
  --hand:'Kalam','Bradley Hand',cursive;
  --radius:10px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.72 var(--read);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;height:auto;display:block}
a{color:var(--indigo-deep)}
[hidden]{display:none !important}
h1,h2,h3,h4,button,input,select,textarea,label,nav,.ui{font-family:var(--ui)}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.02em;line-height:1.1}
p{margin:0 0 1rem}
ul,ol{margin:0;padding:0}
:focus-visible{outline:3px solid var(--indigo);outline-offset:3px;border-radius:4px}

.wrap{max-width:1180px;margin:0 auto;padding:0 clamp(1.25rem,4vw,2.5rem)}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:.6rem 1rem;z-index:100}
.skip:focus{left:0}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.8rem 1.35rem;border-radius:9px;font:600 1rem/1.2 var(--ui);text-decoration:none;border:2px solid var(--ink);color:var(--ink);background:transparent;cursor:pointer;transition:transform .12s ease,box-shadow .12s ease}
.btn-primary{background:var(--indigo);border-color:var(--indigo-deep);color:#fff;box-shadow:0 3px 0 var(--indigo-deep)}
.btn-primary:hover{transform:translateY(1px);box-shadow:0 2px 0 var(--indigo-deep)}
.btn-primary:active{transform:translateY(3px);box-shadow:0 0 0 var(--indigo-deep)}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-hi{background:var(--hi);border-color:var(--hi);color:var(--ink);box-shadow:0 3px 0 rgba(0,0,0,.35)}
.btn-hi:hover{transform:translateY(1px);box-shadow:0 2px 0 rgba(0,0,0,.35)}
.btn-sm{padding:.55rem 1rem;font-size:.92rem}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(252,252,251,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;min-height:68px}
.brand{display:flex;align-items:center;gap:.6rem;font:700 1.3rem/1 var(--ui);letter-spacing:-.015em;color:var(--ink);text-decoration:none}
.brand img{width:34px;height:34px}
.nav ul{display:flex;align-items:center;gap:1.35rem;list-style:none}
.nav a{font:500 .95rem var(--ui);color:var(--ink);text-decoration:none;padding:.35rem 0;border-bottom:2px solid transparent}
.nav a:hover{border-color:var(--indigo)}
.nav a.btn{border-bottom:2px solid var(--indigo-deep);padding:.55rem 1rem}
.menu-btn{display:none;background:none;border:2px solid var(--ink);border-radius:8px;padding:.45rem .8rem;font:600 .95rem var(--ui);cursor:pointer;color:var(--ink)}

/* ---------- Sections ---------- */
.sec{padding:clamp(4rem,9vw,7rem) 0}
.sec-alt{background:var(--paper-2)}
.title{font-size:clamp(1.9rem,3.7vw,2.9rem);max-width:22ch;margin-bottom:1rem}
.title.wide{max-width:30ch}
.lead{font-size:1.15rem;max-width:44rem;color:var(--ink)}
.muted{color:var(--mute)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4.5rem);align-items:center}
.split.top{align-items:start}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;padding:clamp(3rem,7vw,5.5rem) 0 clamp(3.5rem,8vw,6rem);
  background-color:var(--paper);
  background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 31px,var(--rule) 31px,var(--rule) 32px)}
.hero::before{content:"";position:absolute;top:0;bottom:0;left:clamp(12px,3.6vw,54px);width:2px;background:var(--margin);opacity:.5}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:clamp(2rem,5vw,4.5rem);align-items:center;padding-left:clamp(.5rem,3vw,2.5rem)}
.hero h1{font-size:clamp(2.5rem,5.4vw,4.4rem);line-height:1.03;letter-spacing:-.03em;margin-bottom:1.3rem;max-width:14ch}
.hero .lead{max-width:34rem;margin-bottom:1.75rem}
.cta-row{display:flex;flex-wrap:wrap;gap:.9rem}

/* the live page in the hero */
.sheet-wrap{position:relative}
.sheet{position:relative;background:#fff;border:1px solid var(--line);border-radius:6px;padding:1.3rem 1.5rem 1.1rem 3.1rem;
  box-shadow:0 22px 40px -20px rgba(23,27,59,.38),0 2px 0 var(--line);transform:rotate(-1.2deg);
  background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 27px,#EEF2FB 27px,#EEF2FB 28px);
  animation:settle .8s cubic-bezier(.2,.7,.2,1) both}
.sheet::before{content:"";position:absolute;left:2.25rem;top:0;bottom:0;width:2px;background:var(--margin);opacity:.45}
@keyframes settle{from{opacity:0;transform:rotate(-4deg) translateY(18px)}to{opacity:1;transform:rotate(-1.2deg) translateY(0)}}
.sheet-top{display:flex;justify-content:space-between;font:500 .82rem var(--ui);color:var(--mute);margin-bottom:.5rem}
.sheet h2{font:600 1.55rem/1.15 var(--read);letter-spacing:-.01em;margin-bottom:.4rem}
.sheet p{font-size:.98rem;line-height:1.55;margin-bottom:.8rem}
.q{display:flex;gap:1.2rem;align-items:center;margin:.5rem 0 .4rem}
.q svg{flex:none;width:112px;height:112px}
.q-body strong{display:block;font:600 1rem/1.35 var(--ui);margin-bottom:.55rem}
.opts{display:flex;gap:.5rem;flex-wrap:wrap}
.opt{min-width:3.6rem;padding:.45rem .8rem;border:2px solid var(--ink);border-radius:8px;background:#fff;font:600 1rem var(--ui);cursor:pointer;color:var(--ink);transition:background .12s,transform .12s}
.opt:hover{background:var(--paper-2)}
.opt.right{background:#DDF5E6;border-color:#12784A}
.opt.wrong{background:#FCE3E5;border-color:var(--margin)}
.note{min-height:2.7rem;margin:.4rem 0 .2rem;font:400 1.2rem/1.3 var(--hand);color:var(--indigo-deep);transform:rotate(-1deg)}
.sheet-foot{display:flex;align-items:center;justify-content:space-between;gap:.75rem;border-top:1px dashed var(--line);padding-top:.7rem;margin-top:.4rem;font:500 .85rem var(--ui)}
.pill{display:inline-flex;align-items:center;gap:.45rem}
.dot{width:9px;height:9px;border-radius:50%;background:#1E9E62;flex:none}
.is-offline .dot{background:#E39A00}
.switch{display:inline-flex;align-items:center;gap:.5rem;background:none;border:0;padding:0;cursor:pointer;font:600 .85rem var(--ui);color:var(--ink)}
.switch .track{width:34px;height:20px;border-radius:20px;background:#C4C9E2;position:relative;transition:background .15s}
.switch .track::after{content:"";position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:#fff;transition:transform .15s}
.switch[aria-checked="true"] .track{background:var(--indigo)}
.switch[aria-checked="true"] .track::after{transform:translateX(14px)}
.hand-caption{font:400 1.25rem/1.2 var(--hand);color:var(--indigo-deep);margin:1.2rem 0 0 1.2rem;transform:rotate(-1.5deg)}

/* ---------- Doors ---------- */
.door-list{list-style:none;border-top:2px solid var(--ink);margin-top:2.2rem}
.door{display:grid;grid-template-columns:minmax(150px,220px) 1fr auto;gap:1.5rem;align-items:center;padding:1.35rem .5rem 1.35rem 1rem;border-bottom:1px solid var(--line);color:var(--ink);text-decoration:none;position:relative;transition:background .15s}
.door::before{content:"";position:absolute;left:0;top:0;bottom:0;width:0;background:var(--indigo);transition:width .15s}
.door:hover{background:var(--paper-2)}
.door:hover::before{width:5px}
.door-name{font:700 1.5rem/1.1 var(--ui);letter-spacing:-.015em}
.door-text{color:var(--mute);font-size:1rem;line-height:1.55}
.door-go{font:600 .95rem var(--ui);color:var(--indigo-deep);white-space:nowrap}

/* ---------- Chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:.5rem;list-style:none;margin:1rem 0 1.4rem}
.chip{padding:.4rem .85rem;border:2px solid var(--ink);border-radius:999px;background:#fff;font:500 .92rem var(--ui);color:var(--ink);cursor:pointer;transition:background .12s}
.chip:hover{background:var(--paper-2)}
.chip[aria-pressed="true"]{background:var(--hi);border-color:var(--ink)}
.tag{display:inline-block;padding:.2rem .6rem;border-radius:6px;background:var(--paper-2);border:1px solid var(--line);font:500 .85rem var(--ui);margin:0 .35rem .35rem 0}
.presence{margin-top:1.6rem;padding-top:1.2rem;border-top:1px dashed var(--rule);font-size:.98rem}

/* ---------- K-12 ---------- */
.tabs{display:flex;gap:.4rem;margin-top:2rem;flex-wrap:wrap}
.tab{padding:.65rem 1.2rem;border:2px solid var(--ink);border-bottom:0;border-radius:10px 10px 0 0;background:var(--paper-2);font:600 1rem var(--ui);cursor:pointer;color:var(--ink);position:relative;top:2px}
.tab[aria-selected="true"]{background:var(--hi);z-index:1}
.tabpanel{border:2px solid var(--ink);border-radius:0 12px 12px 12px;background:#fff;padding:clamp(1.2rem,3vw,2rem)}
.board-text{max-width:46rem;margin-bottom:1.6rem}
.shelf{display:grid;grid-template-columns:repeat(12,1fr);gap:6px;align-items:end;padding-bottom:6px;border-bottom:6px solid var(--ink);margin-bottom:1.6rem}
.spine{height:calc(96px + var(--h) * 1px);border:0;border-radius:5px 5px 0 0;color:#fff;font:700 1.55rem/1 var(--ui);display:flex;flex-direction:column;align-items:center;justify-content:space-between;padding:.55rem 0 .5rem;cursor:pointer;transition:transform .15s;position:relative;background:var(--c)}
.spine small{font:500 .62rem var(--ui);opacity:.9;letter-spacing:.02em}
.spine::after{content:"";width:60%;height:3px;background:rgba(255,255,255,.55);border-radius:2px}
.spine:hover{transform:translateY(-4px)}
.spine[aria-pressed="true"]{transform:translateY(-12px);outline:3px solid var(--hi);outline-offset:2px}
.class-detail h3{font-size:1.6rem;display:flex;flex-wrap:wrap;align-items:center;gap:.8rem;margin-bottom:.9rem}
.badge{font:600 .8rem var(--ui);padding:.25rem .65rem;border-radius:6px;border:1.5px solid var(--ink)}
.badge.on{background:#DDF5E6;border-color:#12784A;color:#0C5A37}
.badge.dev{background:#FFF1CC;border-color:#B47B00;color:#6F4A00}
.badge.plan{background:var(--paper-2);border-color:var(--mute);color:var(--mute)}
.includes{display:grid;grid-template-columns:repeat(3,1fr);gap:1.4rem;margin-top:2.2rem}
.includes>div{border-top:2px solid var(--ink);padding-top:.8rem}
.includes h4{font-size:1.1rem;margin-bottom:.3rem}
.includes p{font-size:.98rem;color:var(--mute);margin:0}

/* ---------- Platform ---------- */
.media-pair{display:grid;grid-template-columns:.9fr 1.1fr;gap:1rem;align-items:center}
.media-pair img,.frame{border:2px solid var(--ink);border-radius:12px;background:#fff}
.media-pair img:last-child{transform:translateY(1.6rem)}
.steps{list-style:none;counter-reset:s;margin:1.6rem 0 0 15px;border-left:2px dotted var(--indigo)}
.steps li{counter-increment:s;position:relative;padding:0 0 1.3rem 2.4rem}
.steps li::before{content:counter(s);position:absolute;left:-15px;top:-2px;width:28px;height:28px;border-radius:50%;background:var(--indigo);color:#fff;font:700 .9rem/28px var(--ui);text-align:center}
.steps strong{display:block;font:700 1.1rem var(--ui);margin-bottom:.15rem}
.steps span{color:var(--mute);font-size:.98rem}
.trio{display:grid;grid-template-columns:repeat(3,1fr);margin-top:3.5rem;border-top:2px solid var(--ink)}
.trio>div{padding:1.4rem 1.6rem 0 0}
.trio>div+div{padding-left:1.6rem;border-left:1px solid var(--line)}
.trio h3{font-size:1.25rem;margin-bottom:.5rem}
.trio p{font-size:1rem;color:var(--mute);margin:0}
.checklist{list-style:none;margin:1.2rem 0 1.6rem}
.checklist li{position:relative;padding:.3rem 0 .3rem 1.9rem;font-size:1rem}
.checklist li::before{content:"";position:absolute;left:0;top:.6rem;width:1rem;height:.55rem;border-left:3px solid var(--indigo);border-bottom:3px solid var(--indigo);transform:rotate(-48deg) scale(.85)}

/* ---------- Chalkboard: school suite ---------- */
.sec-chalk{background:var(--chalk-bg);color:var(--chalk);
  background-image:radial-gradient(ellipse at 20% 0%,rgba(255,255,255,.05),transparent 55%),radial-gradient(ellipse at 90% 100%,rgba(255,255,255,.04),transparent 50%)}
.sec-chalk .lead,.sec-chalk p{color:var(--chalk-mute)}
.sec-chalk .title{color:var(--chalk)}
.sec-chalk a{color:var(--hi)}
.sec-chalk a.btn-hi{color:var(--ink)}
.chalk-grid{display:grid;grid-template-columns:1fr 1fr;margin-top:2.6rem;border:2px dashed rgba(238,243,234,.45);border-radius:14px}
.chalk-item{padding:clamp(1.4rem,3vw,2.2rem)}
.chalk-item:nth-child(odd){border-right:2px dashed rgba(238,243,234,.35)}
.chalk-item:nth-child(-n+2){border-bottom:2px dashed rgba(238,243,234,.35)}
.chalk-item h3{font-size:1.55rem;margin-bottom:.55rem;color:var(--chalk)}
.chalk-item p{font-size:1rem;margin:0}
.chalk-note{font:400 1.3rem/1.3 var(--hand);color:var(--hi);margin:1.6rem 0 1.4rem;transform:rotate(-1deg)}

/* ---------- Partners ---------- */
.cols2{display:grid;grid-template-columns:1fr 1fr;gap:clamp(1.5rem,4vw,3.5rem);margin-top:2.6rem}
.panel{background:#fff;border:2px solid var(--ink);border-radius:14px;padding:clamp(1.3rem,3vw,2rem)}
.panel h3{font-size:1.5rem;margin-bottom:.6rem}
.panel{display:flex;flex-direction:column}
.panel .btn{align-self:flex-start;margin-top:auto}
.panel .frame{margin:1.4rem 0 0;overflow:hidden}
.engage{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem;margin-top:1.4rem}
.engage>div{border-top:2px solid var(--ink);padding-top:.7rem}
.engage h4{font-size:1.1rem;margin-bottom:.25rem}
.engage p{font-size:.98rem;color:var(--mute);margin:0}

/* ---------- Authors ---------- */
.routes{display:grid;grid-template-columns:1fr 1fr;gap:1.4rem;margin-top:2.4rem}
.route{border:2px solid var(--ink);border-radius:14px;padding:clamp(1.3rem,3vw,2rem);background:#fff;display:flex;flex-direction:column}
.route h3{font-size:1.5rem;margin-bottom:.5rem}
.route .btn{margin-top:auto;align-self:flex-start}
.route .checklist{margin-bottom:1.4rem}
.fine{font-size:.92rem;color:var(--mute)}
.author-flow{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4rem);margin-top:3.5rem;align-items:center}

/* ---------- Catalog ---------- */
.filters{display:flex;flex-wrap:wrap;gap:1rem 1.4rem;align-items:end;margin:1.8rem 0 .4rem}
.field-inline{display:flex;flex-direction:column;gap:.3rem;font:600 .85rem var(--ui)}
.field-inline input,.field-inline select{min-width:210px}
.books{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:1.6rem;margin-top:1.8rem}
.book{display:flex;flex-direction:column;gap:.6rem;height:100%}
.cover{aspect-ratio:3/4;border-radius:4px 10px 10px 4px;background:var(--c);color:#fff;padding:1rem 1rem .9rem 1.4rem;display:flex;flex-direction:column;justify-content:space-between;position:relative;box-shadow:6px 8px 0 rgba(23,27,59,.14);overflow:hidden}
.cover::before{content:"";position:absolute;left:.55rem;top:0;bottom:0;width:2px;background:rgba(255,255,255,.35)}
.cover .cls{font:700 3.4rem/.9 var(--ui);letter-spacing:-.04em}
.cover .cls small{display:block;font:500 .78rem var(--ui);letter-spacing:.02em;margin-bottom:.2rem;opacity:.9}
.cover .ct{font:700 1.3rem/1.15 var(--ui);letter-spacing:-.01em}
.cover .ct.hi{font-family:var(--hand);font-weight:700;font-size:1.65rem}
.cover .cb{font:500 .72rem var(--ui);display:flex;justify-content:space-between;opacity:.92}
.book h3{font-size:1.05rem;line-height:1.25}
.book .meta{font:500 .85rem var(--ui);color:var(--mute)}
.book .btn{align-self:flex-start;margin-top:auto}
.empty{grid-column:1/-1;border:2px dashed var(--indigo);border-radius:14px;padding:2rem;background:#fff}
.empty h3{font-size:1.4rem;margin-bottom:.5rem}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:clamp(2rem,5vw,4.5rem);align-items:start}
.formcard{background:#fff;border:2px solid var(--ink);border-radius:14px;box-shadow:7px 7px 0 var(--ink);padding:clamp(1.2rem,3vw,2rem)}
.formcard .tabs{margin-top:0}
.formcard .tab{font-size:.92rem;padding:.55rem .9rem}
.form-body{border-top:2px solid var(--ink);margin-top:-2px;padding-top:1.4rem}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.f{display:flex;flex-direction:column;gap:.35rem;margin-bottom:1rem}
.f label,.f .lab{font:600 .9rem var(--ui)}
.f label i{color:var(--margin);font-style:normal}
input,select,textarea{width:100%;padding:.7rem .85rem;border:2px solid var(--ink);border-radius:8px;background:#fff;color:var(--ink);font:500 1rem var(--ui)}
textarea{min-height:110px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:3px solid var(--hi);outline-offset:0;border-color:var(--indigo-deep)}
fieldset{border:0;padding:0;margin:0}
.checks{display:grid;gap:.5rem;margin-bottom:1rem}
.checks label{display:flex;gap:.6rem;align-items:flex-start;font:500 .96rem var(--ui);cursor:pointer}
.checks input{width:1.1rem;height:1.1rem;margin-top:.15rem;accent-color:var(--indigo)}
.consent label{display:flex;gap:.6rem;align-items:flex-start;font:400 .88rem/1.45 var(--ui);color:var(--mute)}
.consent input{width:1.1rem;height:1.1rem;margin-top:.1rem;accent-color:var(--indigo)}
.hp{position:absolute;left:-9999px;height:0;overflow:hidden}
.form-msg{margin-top:1rem;font:500 .98rem var(--ui)}
.form-msg.err{color:#A3202B}
.success{padding:1.4rem 0}
.success h3{font-size:1.6rem;margin-bottom:.5rem}
.mail{font:600 1.15rem var(--ui)}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#DDE0F5;padding:3.5rem 0 2rem}
.site-footer a{color:#fff;text-decoration:none}
.site-footer a:hover{text-decoration:underline}
.foot-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:2rem}
.foot-grid h4{font-size:1rem;margin-bottom:.8rem;color:#fff}
.foot-grid ul{list-style:none;display:grid;gap:.45rem;font:400 .95rem var(--ui)}
.foot-brand p{font-size:.95rem;color:#B9BEE0;max-width:26rem}
.foot-brand .brand{color:#fff;margin-bottom:.8rem}
.legal-line{margin-top:2.5rem;padding-top:1.3rem;border-top:1px solid rgba(255,255,255,.18);font:400 .85rem/1.6 var(--ui);color:#B9BEE0}

/* ---------- Legal pages ---------- */
.legal{padding:clamp(3rem,7vw,5rem) 0}
.legal .wrap{max-width:820px}
.legal h1{font-size:clamp(2.1rem,4.5vw,3.2rem);margin-bottom:.4rem}
.legal h2{font-size:1.4rem;margin:2.2rem 0 .6rem}
.legal ul{margin:0 0 1rem 1.2rem}
.legal li{margin-bottom:.3rem}

/* ---------- Responsive ---------- */
@media (max-width:980px){
  .menu-btn{display:inline-block}
  .nav{position:absolute;left:0;right:0;top:100%;background:var(--paper);border-bottom:2px solid var(--ink);display:none;padding:1rem clamp(1.25rem,4vw,2.5rem) 1.4rem}
  .nav.open{display:block}
  .nav ul{flex-direction:column;align-items:flex-start;gap:.5rem}
  .nav a{font-size:1.05rem}
  .hero-grid,.split,.cols2,.routes,.author-flow,.contact-grid{grid-template-columns:1fr}
  .door{grid-template-columns:1fr;gap:.35rem}
  .shelf{grid-template-columns:repeat(6,1fr);row-gap:14px}
  .includes,.trio{grid-template-columns:1fr}
  .trio>div,.trio>div+div{padding:1.2rem 0 0;border-left:0}
  .chalk-grid{grid-template-columns:1fr}
  .chalk-item:nth-child(odd){border-right:0}
  .chalk-item:not(:last-child){border-bottom:2px dashed rgba(238,243,234,.35)}
  .foot-grid{grid-template-columns:1fr 1fr}
  .media-pair img:last-child{transform:none}
}
@media (max-width:640px){
  .grid2,.engage{grid-template-columns:1fr}
  .q{flex-direction:column;align-items:flex-start}
  .foot-grid{grid-template-columns:1fr}
  .sheet{padding-left:2.7rem}
  .hero h1{max-width:none}
  .hero::before{left:9px}
  .hero-grid{padding-left:1rem}
  .books{grid-template-columns:repeat(2,1fr);gap:1.2rem 1rem}
  .cover{padding:.8rem .7rem .7rem 1.1rem}
  .cover .cls{font-size:2.4rem}
  .cover .ct{font-size:1.02rem}
  .cover .ct.hi{font-size:1.3rem}
  .book h3{font-size:.98rem}
  .book .meta{font-size:.8rem}
  .field-inline input,.field-inline select{min-width:0;width:100%}
  .field-inline{flex:1 1 100%}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none !important;transition:none !important}
}

/* ---------- Additions: brand lockup, video, social, higher ed, covers ---------- */
.brand-text{display:flex;flex-direction:column;gap:.18rem}
.brand-name{line-height:1}
.brand sup{font-size:.5em;font-weight:600;vertical-align:super;margin-left:1px}
.brand small{font:500 .7rem/1 var(--ui);color:var(--mute);letter-spacing:.005em}
.site-footer .brand small{color:#B9BEE0}

.link-play{display:inline-flex;align-items:center;gap:.55rem;padding:.8rem .4rem;font:600 1rem var(--ui);color:var(--ink);text-decoration:none;border-bottom:2px solid transparent}
.link-play:hover{border-color:var(--indigo)}
.link-play .tri{width:30px;height:30px;border-radius:50%;background:var(--hi);border:2px solid var(--ink);position:relative;flex:none}
.link-play .tri::after{content:"";position:absolute;left:10px;top:6px;border-left:9px solid var(--ink);border-top:6px solid transparent;border-bottom:6px solid transparent}

.video{position:relative;aspect-ratio:16/9;border:2px solid var(--ink);border-radius:14px;overflow:hidden;background:var(--ink);
  background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 27px,rgba(255,255,255,.07) 27px,rgba(255,255,255,.07) 28px);box-shadow:6px 6px 0 var(--ink)}
.video-play{position:absolute;inset:0;width:100%;height:100%;border:0;padding:0;background:transparent;cursor:pointer;display:block}
.video-play img{width:100%;height:100%;object-fit:cover}
.play-icon{position:absolute;left:50%;top:50%;width:76px;height:76px;margin:-38px 0 0 -38px;border-radius:50%;background:var(--hi);border:3px solid var(--ink);box-shadow:0 4px 0 rgba(0,0,0,.4);transition:transform .12s}
.play-icon::after{content:"";position:absolute;left:29px;top:22px;border-left:22px solid var(--ink);border-top:14px solid transparent;border-bottom:14px solid transparent}
.video-play:hover .play-icon{transform:scale(1.06)}
.video-cap{position:absolute;left:14px;bottom:14px;background:#fff;color:var(--ink);border:2px solid var(--ink);border-radius:8px;padding:.3rem .7rem;font:600 .9rem var(--ui)}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-links{display:flex;flex-wrap:wrap;gap:.4rem 1.4rem;margin:1.5rem 0 0;font:600 .95rem var(--ui)}

.social{display:flex;gap:.6rem;list-style:none;margin:1rem 0 0}
.social a{width:40px;height:40px;border-radius:50%;background:#fff;color:var(--ink);border:2px solid var(--ink);display:grid;place-items:center;transition:transform .12s}
.social a:hover{transform:translateY(-2px);text-decoration:none}
.social svg{width:20px;height:20px}
.site-footer .social a{color:var(--ink);border-color:#fff}
.site-footer .social a:hover{text-decoration:none}
.follow{margin:1.4rem 0 0;font:600 .95rem var(--ui)}

.series-grid{display:grid;gap:1.1rem}
.series-card{border:2px solid var(--ink);border-radius:14px;padding:1.3rem 1.5rem;background:#fff}
.series-card h3{font-size:1.35rem;margin-bottom:.3rem}
.series-card p{color:var(--mute);font-size:1rem;margin-bottom:.7rem}

.frame svg{display:block;width:100%;height:auto}
.frame img{width:100%}
.frame{overflow:hidden}

.cover .cls-tag{align-self:flex-start;font:600 .78rem/1.2 var(--ui);border:1.5px solid rgba(255,255,255,.75);border-radius:5px;padding:.2rem .5rem}
.cover .cs{font:500 .8rem/1.2 var(--ui);margin-top:.45rem;opacity:.92}
.book .blurb{font-size:.92rem;line-height:1.5;margin:0;color:var(--ink)}

@media (max-width:1180px){
  .nav ul{gap:.95rem}
  .nav a{font-size:.9rem}
}
@media (max-width:640px){
  .brand small{font-size:.62rem}
  .video-cap{font-size:.8rem}
  .play-icon{width:62px;height:62px;margin:-31px 0 0 -31px}
  .play-icon::after{left:24px;top:17px;border-left-width:18px;border-top-width:12px;border-bottom-width:12px}
}
.foot-grid .social{display:flex;flex-wrap:wrap;gap:.6rem;font:inherit}