/* Mr Poore Maths — v3: typeset like mathematics, marked like a teacher */
:root{
  --paper:#FAF9F5;
  --card:#FFFFFF;
  --ink:#171D2B;
  --muted:#5A6170;
  --pen:#5E2CA5;
  --pen-deep:#3D1A73;
  --pen-soft:#F2ECFB;
  --lav:#E9E1F7;
  --tick:#2E7D4F;
  --tick-soft:#E7F3EB;
  --amber:#B45309;
  --amber-soft:#FCF0DE;
  --line:#E5E2DA;
  --shadow-s:0 1px 2px rgba(23,29,43,.05), 0 2px 8px rgba(23,29,43,.04);
  --shadow-m:0 2px 6px rgba(61,26,115,.06), 0 14px 36px rgba(61,26,115,.10);
  --r-s:10px; --r-m:16px; --r-l:22px;
  --font-display:'STIX Two Text', Georgia, serif;
  --font-body:'Source Sans 3', system-ui, sans-serif;
  --font-mono:'IBM Plex Mono', ui-monospace, monospace;
  --font-hand:'Caveat', cursive;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--paper);
  line-height:1.65;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
a{color:var(--pen)}
a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--pen);outline-offset:2px;border-radius:4px}
::selection{background:var(--lav)}

/* ============ type ============ */
h1,h2{font-family:var(--font-display);font-weight:600;letter-spacing:-.015em}
h1{font-size:clamp(2.4rem,5.8vw,4rem);line-height:1.04}
h2{font-size:clamp(1.7rem,3.4vw,2.3rem);line-height:1.15;margin-bottom:10px}
h3{font-family:var(--font-body);font-weight:600;font-size:1.1rem}
em.serif{font-family:var(--font-display);font-style:italic}
.kicker{
  font-family:var(--font-mono);font-weight:500;font-size:.76rem;
  letter-spacing:.14em;text-transform:uppercase;color:var(--pen);margin-bottom:12px;
}
.section-sub{color:var(--muted);max-width:62ch;margin-bottom:34px;font-size:1.06rem}
.annotation{
  font-family:var(--font-hand);color:var(--pen);font-size:1.55rem;line-height:1.15;
  transform:rotate(-3.5deg);display:inline-block;
}
.mono{font-family:var(--font-mono)}

/* ============ motion ============ */
html.js .reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
html.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}

/* ============ nav ============ */
header.site{
  position:sticky;top:0;z-index:60;
  background:rgba(250,249,245,.86);
  backdrop-filter:blur(14px) saturate(1.4);
  -webkit-backdrop-filter:blur(14px) saturate(1.4);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:18px;padding:0}
.brand{
  font-family:var(--font-display);font-weight:700;font-size:1.22rem;
  text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:10px;
  padding:14px 0;flex:none;
}
.tabs{
  display:flex;list-style:none;gap:2px;margin-left:auto;
  overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch;
}
.tabs::-webkit-scrollbar{display:none}
.tabs a{
  position:relative;display:block;padding:20px 13px;white-space:nowrap;
  text-decoration:none;color:var(--muted);font-weight:600;font-size:.93rem;
  transition:color .2s ease;
}
.tabs a::after{
  content:"";position:absolute;left:13px;right:13px;bottom:0;height:3px;
  background:var(--pen);border-radius:3px 3px 0 0;
  transform:scaleX(0);transform-origin:center;transition:transform .25s ease;
}
.tabs a:hover{color:var(--ink)}
.tabs a.active{color:var(--pen)}
.tabs a.active::after,.tabs a:hover::after{transform:scaleX(1)}
.tabs a.nav-cta{
  background:var(--pen);color:#fff;border-radius:999px;
  padding:8px 16px;margin:12px 0 12px 8px;font-size:.88rem;
  transition:background .2s ease, transform .15s ease;
}
.tabs a.nav-cta::after{display:none}
.tabs a.nav-cta:hover{background:var(--pen-deep);transform:translateY(-1px)}
@media (max-width:820px){
  .nav{flex-wrap:wrap;gap:0}
  .brand{padding:12px 0 6px}
  .tabs{margin-left:-24px;margin-right:-24px;padding:0 24px;width:calc(100% + 48px)}
  .tabs a{padding:12px 11px}
  .tabs a::after{left:11px;right:11px}
  .tabs a.nav-cta{margin:6px 0 8px 6px;padding:7px 14px}
}

/* ============ buttons ============ */
.btn{
  display:inline-block;text-decoration:none;font-weight:600;font-size:1rem;
  padding:14px 28px;border-radius:999px;border:2px solid var(--ink);
  transition:transform .15s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
  cursor:pointer;font-family:inherit;
}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn-primary:hover{background:var(--pen);border-color:var(--pen);color:#fff;box-shadow:var(--shadow-m)}
.btn-ghost{color:var(--ink);background:transparent}
.btn-ghost:hover{border-color:var(--pen);color:var(--pen)}
.badge{
  display:inline-flex;align-items:center;gap:8px;background:var(--card);color:var(--pen);
  font-weight:600;font-size:.85rem;padding:7px 15px;border-radius:999px;
  border:1px solid var(--lav);box-shadow:var(--shadow-s);
}
.badge::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--tick)}

/* status chips */
.status{display:inline-block;font-family:var(--font-mono);font-size:.72rem;font-weight:500;padding:4px 11px;border-radius:999px;white-space:nowrap;letter-spacing:.02em}
.status.soon{background:var(--amber-soft);color:var(--amber)}
.status.free{background:var(--tick-soft);color:var(--tick)}
.status.live{background:var(--pen-soft);color:var(--pen)}

/* ============ hero ============ */
.hero{position:relative;padding:76px 0 30px;overflow:visible}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero::before{
  content:"";position:absolute;inset:-160px -50vw 0;z-index:-1;
  background:
    radial-gradient(ellipse 780px 460px at 22% -10%, var(--pen-soft) 0%, rgba(242,236,251,0) 62%),
    radial-gradient(ellipse 620px 420px at 92% 8%, var(--lav) 0%, rgba(233,225,247,0) 55%);
  opacity:.9;
}
.hero h1{max-width:13ch}
.hero h1 .not{font-style:italic;position:relative;white-space:nowrap;color:var(--pen)}
.hero h1 .not::after{
  content:"";position:absolute;left:-1%;right:-1%;bottom:.1em;height:.2em;
  background:var(--pen);opacity:.18;border-radius:3px;transform:rotate(-1deg);
}
.hero p.lede{max-width:50ch;color:var(--muted);font-size:1.18rem;margin:22px 0 32px}
.cta-row{display:flex;gap:14px;flex-wrap:wrap}
.hero .annotation{margin:12px 0 0 2px}
@media (max-width:860px){
  .hero{padding:48px 0 16px}
  .hero-grid{grid-template-columns:1fr;gap:34px}
}

/* the jotter — animated maths panel */
.jotter{
  position:relative;background:var(--card);border:1px solid var(--line);
  border-radius:var(--r-l);box-shadow:var(--shadow-m);padding:18px;
  transform:rotate(1.2deg);
}
.jotter svg{display:block;width:100%;height:auto;border-radius:12px;
  background:
    linear-gradient(#F0EDF7 1px, transparent 1px),
    linear-gradient(90deg,#F0EDF7 1px, transparent 1px);
  background-size:24px 24px;
}
.jotter .clip{
  position:absolute;top:-14px;left:50%;transform:translateX(-50%) rotate(-2deg);
  background:var(--pen);color:#fff;font-family:var(--font-mono);font-size:.7rem;
  letter-spacing:.12em;text-transform:uppercase;padding:5px 14px;border-radius:999px;
}
.draw{stroke-dasharray:600;stroke-dashoffset:0;animation:draw 2.2s ease .3s both}
.draw2{stroke-dasharray:400;stroke-dashoffset:0;animation:draw2 1.6s ease 1.6s both}
.pop{animation:pop .5s ease 2.9s both}
@keyframes draw{from{stroke-dashoffset:600}to{stroke-dashoffset:0}}
@keyframes draw2{from{stroke-dashoffset:400}to{stroke-dashoffset:0}}
@keyframes pop{from{opacity:0;transform:scale(.6)}to{opacity:1;transform:scale(1)}}

/* formula ribbon */
.ribbon{
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  background:var(--card);overflow:hidden;padding:12px 0;margin-top:44px;
}
.ribbon-track{display:flex;gap:0;width:max-content;animation:marquee 46s linear infinite}
.ribbon:hover .ribbon-track{animation-play-state:paused}
.ribbon span{
  font-family:var(--font-hand);color:var(--pen);font-size:1.45rem;
  padding:0 30px;white-space:nowrap;opacity:.85;
}
@keyframes marquee{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* ============ sections & cards ============ */
section{padding:64px 0}
.specs{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.spec{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-m);
  padding:26px 24px;display:flex;flex-direction:column;gap:9px;position:relative;
  text-decoration:none;color:var(--ink);box-shadow:var(--shadow-s);overflow:hidden;
  transition:transform .22s cubic-bezier(.2,.7,.3,1.2), box-shadow .22s ease, border-color .22s ease;
}
a.spec:hover{transform:translateY(-5px);box-shadow:var(--shadow-m);border-color:var(--lav)}
.spec .glyph{
  position:absolute;right:-8px;bottom:-34px;font-family:var(--font-display);
  font-size:7.4rem;line-height:1;color:var(--pen-soft);font-style:italic;
  user-select:none;pointer-events:none;transition:color .25s ease, transform .25s ease;
}
a.spec:hover .glyph{color:var(--lav);transform:translateY(-4px)}
.spec.flagship{border:2px solid var(--pen)}
.spec .flag{
  position:absolute;top:-12px;right:16px;background:var(--pen);color:#fff;
  font-family:var(--font-mono);font-size:.66rem;font-weight:500;letter-spacing:.1em;
  text-transform:uppercase;padding:4px 11px;border-radius:999px;
}
.spec-code{
  font-family:var(--font-mono);font-size:.72rem;font-weight:500;color:var(--muted);
  letter-spacing:.03em;border:1px solid var(--line);border-radius:6px;padding:3px 9px;
  align-self:flex-start;background:var(--paper);
}
.spec h3{font-family:var(--font-display);font-size:1.35rem;font-weight:600}
.spec p{font-size:.96rem;color:var(--muted);position:relative;z-index:1;max-width:34ch}
.spec .go{margin-top:auto;font-weight:600;font-size:.92rem;color:var(--pen);position:relative;z-index:1}
.spec .go::after{content:" \2192";transition:margin-left .2s ease}
a.spec:hover .go::after{margin-left:5px}

/* ============ exam cover ============ */
.exam-cover{
  background:var(--card);border:1.5px solid var(--ink);border-radius:var(--r-l);
  padding:34px;margin:52px 0 8px;position:relative;box-shadow:var(--shadow-m);overflow:hidden;
}
.exam-cover .corner{
  position:absolute;top:-13px;left:26px;background:var(--pen);color:#fff;
  font-family:var(--font-mono);font-size:.68rem;font-weight:500;letter-spacing:.1em;
  text-transform:uppercase;padding:4px 13px;border-radius:999px;
}
.exam-cover h1{font-size:clamp(2rem,4.6vw,3rem);margin:8px 0 8px}
.exam-cover .meta{
  display:flex;gap:10px 28px;flex-wrap:wrap;border-top:1px dashed var(--line);
  margin-top:20px;padding-top:16px;color:var(--muted);font-family:var(--font-mono);font-size:.8rem;
}
.exam-cover .meta strong{color:var(--ink);font-weight:600}
.exam-cover .annotation{position:absolute;right:30px;top:18px;font-size:1.35rem;z-index:2}
.exam-cover .watermark{
  position:absolute;right:-24px;bottom:-70px;font-family:var(--font-display);font-style:italic;
  font-size:15rem;line-height:1;color:var(--pen-soft);user-select:none;pointer-events:none;
}
.exam-cover > *{position:relative;z-index:1}
.exam-cover .watermark{z-index:0}
@media (max-width:640px){.exam-cover .annotation{display:none}.exam-cover{padding:26px}}

/* ============ tables ============ */
.table-scroll{overflow-x:auto;border-radius:var(--r-m);box-shadow:var(--shadow-s)}
.res-table{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--line);border-radius:var(--r-m);overflow:hidden}
.res-table th{
  text-align:left;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--muted);font-weight:500;padding:13px 18px;
  background:var(--paper);border-bottom:1px solid var(--line);
}
.res-table td{padding:16px 18px;border-bottom:1px solid var(--line);vertical-align:top;font-size:.97rem}
.res-table tr:last-child td{border-bottom:none}
.res-table tbody tr{transition:background .15s ease}
.res-table tbody tr:hover{background:var(--paper)}
.res-table td.name{font-weight:600}
.res-table td .sub{display:block;font-weight:400;color:var(--muted);font-size:.87rem;margin-top:2px}

/* topic grid */
.topics{display:grid;grid-template-columns:repeat(auto-fill,minmax(225px,1fr));gap:14px}
.topic{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-m);padding:19px;
  display:flex;flex-direction:column;gap:6px;box-shadow:var(--shadow-s);
  transition:transform .2s ease, box-shadow .2s ease;
}
.topic:hover{transform:translateY(-3px);box-shadow:var(--shadow-m)}
.topic h3{font-size:1.02rem}
.topic p{font-size:.9rem;color:var(--muted)}
.topic .status{align-self:flex-start;margin-top:auto}

/* strand owners */
.owners{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px;margin-top:20px}
.owner{background:var(--pen-soft);border-radius:var(--r-s);padding:14px 18px;font-size:.95rem}
.owner strong{font-weight:600}

/* ============ people ============ */
.teachers{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px}
.teacher{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-m);padding:26px;
  display:flex;gap:16px;align-items:flex-start;box-shadow:var(--shadow-s);
}
.avatar{
  width:58px;height:58px;border-radius:50%;flex:none;
  background:linear-gradient(145deg,var(--pen-soft),var(--lav));color:var(--pen);
  font-family:var(--font-display);font-weight:700;font-size:1.25rem;
  display:flex;align-items:center;justify-content:center;
}
.teacher .role,.bio-card .role{color:var(--pen);font-weight:600;font-size:.88rem;margin-bottom:6px}
.teacher p{font-size:.95rem;color:var(--muted)}
.teacher h3{font-family:var(--font-display);font-size:1.3rem}

.bio-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-l);padding:40px;
  margin-bottom:24px;position:relative;box-shadow:var(--shadow-m);overflow:hidden;
}
.bio-card .avatar{width:76px;height:76px;font-size:1.6rem;margin-bottom:16px}
.bio-card h2{margin-bottom:2px}
.bio-card .role{font-size:.95rem;margin-bottom:16px}
.bio-card p{color:var(--ink);margin-bottom:15px;max-width:70ch;position:relative;z-index:1}
.bio-card p:last-child{margin-bottom:0}
.bio-card .subjects{display:flex;gap:8px;flex-wrap:wrap;margin:4px 0 20px}
.bio-card .annotation{position:absolute;right:34px;top:28px}
@media (max-width:640px){.bio-card .annotation{display:none}.bio-card{padding:28px}}

/* ============ signup ============ */
.signup{
  background:linear-gradient(140deg, var(--card) 55%, var(--pen-soft));
  border:1px solid var(--lav);border-radius:var(--r-l);padding:40px;
  display:grid;grid-template-columns:1.2fr 1fr;gap:30px;align-items:center;
  box-shadow:var(--shadow-m);
}
.signup h2{margin-bottom:6px}
.signup .free-sub{color:var(--muted)}
.signup form{display:flex;gap:10px;flex-wrap:wrap}
.signup input[type=email]{
  flex:1;min-width:200px;padding:13px 18px;font-size:1rem;font-family:inherit;
  border:2px solid var(--line);border-radius:999px;background:var(--card);
  transition:border-color .2s ease;
}
.signup input[type=email]:focus{border-color:var(--pen)}
.signup button{
  padding:13px 24px;font-size:1rem;font-weight:600;font-family:inherit;
  background:var(--pen);color:#fff;border:2px solid var(--pen);border-radius:999px;cursor:pointer;
  transition:background .2s ease, transform .15s ease;
}
.signup button:hover{background:var(--pen-deep);transform:translateY(-1px)}
.signup small{color:var(--muted);display:block;margin-top:12px}
.ml-success{display:none;font-weight:600;color:var(--tick);margin-top:10px}
@media (max-width:720px){.signup{grid-template-columns:1fr;padding:28px}}

/* roadmap */
.roadmap{list-style:none;border-left:2px solid var(--lav);margin-left:8px}
.roadmap li{padding:0 0 24px 24px;position:relative}
.roadmap li::before{
  content:"";position:absolute;left:-8px;top:6px;width:14px;height:14px;border-radius:50%;
  background:var(--pen);border:3.5px solid var(--paper);box-shadow:0 0 0 1.5px var(--lav);
}
.roadmap li strong{display:block;font-weight:600;font-family:var(--font-display);font-size:1.12rem}
.roadmap li span{color:var(--muted);font-size:.96rem}

/* ============ footer ============ */
footer.site{border-top:1px solid var(--line);padding:44px 0 52px;margin-top:48px;background:var(--card)}
.foot{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;align-items:flex-start}
.foot .cols{display:flex;gap:44px;flex-wrap:wrap}
.foot h4{font-family:var(--font-mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);margin-bottom:10px;font-weight:500}
.foot ul{list-style:none}
.foot li{margin-bottom:6px}
.foot a{text-decoration:none;font-size:.95rem}
.foot a:hover{text-decoration:underline}
.honesty{max-width:46ch;color:var(--muted);font-size:.9rem}
.copyright{margin-top:26px;font-size:.85rem;color:var(--muted)}

@media (max-width:720px){
  section{padding:46px 0}
}