@import url('https://fonts.googleapis.com/css2?family=Caprasimo&family=Figtree:wght@400;600;700&display=swap');
:root{
  --color-bg:#f5ead8; --color-surface:#ebddc5; --color-text:#201e1d;
  --color-divider:color-mix(in srgb,#201e1d 16%,transparent);
  --color-neutral-100:#f9f4ed; --color-neutral-200:#eee7db;
  --color-neutral-400:#c0b6a5; --color-neutral-700:#645c50;
  --color-accent:#5f4bc0; --color-accent-100:#f1eefb; --color-accent-200:#e2ddf7;
  --color-accent-600:#6753bd; --color-accent-700:#513da0; --color-accent-800:#3a2b76;
  --must-bg:#fff2eb; --must-dot:#d67f48; --must-fg:#8c491a;
  --use-bg:#f0fae1;  --use-dot:#8fa073;  --use-fg:#56633f;
  --skip-bg:#eee7db; --skip-dot:#c0b6a5; --skip-fg:#645c50;
  --paper:#fbf7f0;
  --font-heading:"Caprasimo",Georgia,serif;
  --font-body:"Figtree",system-ui,-apple-system,sans-serif;
  --space-2:8.8px; --space-3:13.2px; --space-4:17.6px; --space-6:26.4px; --space-8:35.2px;
  --shadow-sm:0 1px 2px color-mix(in srgb,#2e2b25 14%,transparent);
  --shadow-md:0 3px 10px color-mix(in srgb,#2e2b25 16%,transparent);
  --shadow-lg:0 12px 32px color-mix(in srgb,#2e2b25 22%,transparent);
}

*,*::before,*::after{box-sizing:border-box}
body{
  margin:0;background:var(--color-bg);color:var(--color-text);
  font-family:var(--font-body);font-size:15px;line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-heading);font-weight:400;line-height:1.12;
  letter-spacing:-0.015em;margin:0 0 var(--space-2);text-wrap:balance}
h1{font-size:clamp(30px,4.4vw,42px)} h2{font-size:25px} h3{font-size:21px}
a{color:var(--color-accent-700);text-underline-offset:3px}
:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}
::selection{background:color-mix(in srgb,var(--color-accent) 26%,transparent)}
.kicker{font-size:11.5px;letter-spacing:0.09em;text-transform:uppercase;
  color:var(--color-accent-700);margin-bottom:10px}
.muted{color:color-mix(in srgb,var(--color-text) 55%,transparent)}
/* Nav */
.nav{display:flex;align-items:center;gap:var(--space-4);
  padding:14px clamp(18px,4vw,44px);position:sticky;top:0;z-index:40;
  background:color-mix(in srgb,var(--color-bg) 88%,transparent);backdrop-filter:blur(14px)}
.brand{font-family:var(--font-heading);font-size:18px;display:flex;align-items:center;
  gap:10px;text-decoration:none;color:inherit}
.brand-mark{width:26px;height:26px;border-radius:9px;background:var(--color-accent);
  display:grid;place-items:center;color:#fff;font-size:14px}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:var(--space-4);
  font-size:13px}
.nav-right a{color:inherit;text-decoration:none}
.nav-right a:hover,.nav-right a[aria-current=page]{color:var(--color-accent)}
/* Buttons - pill, per the design system */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;
  cursor:pointer;text-decoration:none;font-family:var(--font-heading);font-weight:400;
  font-size:14px;line-height:1.2;color:var(--color-text);background:transparent;
  border:1px solid transparent;padding:10px 18px;border-radius:999px}
.btn-primary{background:var(--color-accent);color:#fff}
.btn-primary:hover{background:var(--color-accent-600)}
.btn-secondary{border-color:var(--color-divider)}
.btn-secondary:hover{background:color-mix(in srgb,var(--color-text) 7%,transparent)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn-lg{font-size:16px;padding:13px 24px}
/* Tags */
.tag{display:inline-flex;align-items:center;font-size:11.5px;letter-spacing:0.02em;
  padding:4px 12px;border-radius:999px;white-space:nowrap}
.dot{width:7px;height:7px;border-radius:999px;margin-right:6px;flex:none}
/* Rail - the pill bar carrying a census or filter row */
.rail{display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  padding:12px 18px;border-radius:999px;background:var(--paper)}
.rail-right{margin-left:auto;font-size:13px;color:var(--color-accent-700);font-weight:600}
/* Panels */
.panel{padding:16px 18px;border-radius:20px;background:#fff}
.panel-kicker{font-size:11.5px;letter-spacing:0.09em;text-transform:uppercase;margin-bottom:7px}
.warn{display:flex;gap:10px;padding:14px 18px;border-radius:20px;
  background:var(--must-bg);color:var(--must-fg);font-size:13.5px}
/* Forms - the only text inputs in the product are the auth pages */
.field{display:block;margin-bottom:var(--space-4)}
.field>span{display:block;font-size:11.5px;letter-spacing:0.09em;
  text-transform:uppercase;color:var(--color-accent-700);margin-bottom:7px}
.field input{width:100%;font-family:var(--font-body);font-size:15.5px;
  color:var(--color-text);background:#fff;border:1px solid var(--color-divider);
  border-radius:16px;padding:12px 16px}
.field input::placeholder{color:var(--color-neutral-400)}
/* Ring rather than a colour swap: the border alone is too quiet against the
   paper background to show which field has focus. */
.field input:focus{border-color:var(--color-accent);outline:none;
  box-shadow:0 0 0 3px var(--color-accent-200)}
.auth{max-width:420px;margin:0 auto}
.auth .btn{width:100%}
.auth-alt{text-align:center;font-size:13.5px;margin-top:var(--space-6);
  color:color-mix(in srgb,var(--color-text) 58%,transparent)}
.ref{font-size:12px;color:color-mix(in srgb,var(--color-text) 45%,transparent);font-style:italic}
table{width:100%;border-collapse:collapse;font-size:13.5px}
th{text-align:left;font-size:11px;letter-spacing:0.08em;text-transform:uppercase;
  color:color-mix(in srgb,var(--color-text) 60%,transparent);padding:9px;
  border-bottom:1px solid var(--color-divider)}
td{padding:9px;border-bottom:1px solid color-mix(in srgb,var(--color-text) 8%,transparent);
  font-variant-numeric:tabular-nums}
td.num,th.num{text-align:right}
tr.total td{font-weight:700;border-bottom:0}
.scroll{overflow-x:auto}

main{max-width:1080px;margin:0 auto;padding:0 clamp(18px,4vw,44px) 80px}
.hero{padding:var(--space-8) 0 var(--space-6)}
.sub{color:color-mix(in srgb,var(--color-text) 58%,transparent);font-size:14px;margin:0}
.sec{padding:22px 24px;border-radius:28px;margin-bottom:14px}
.sec>summary{display:flex;align-items:flex-start;gap:12px;cursor:pointer;list-style:none}
.sec>summary::-webkit-details-marker{display:none}
.sec h3{margin:0;flex:1}
.chev{flex:none;margin-top:2px;transition:transform .18s ease;
  color:color-mix(in srgb,var(--color-text) 45%,transparent)}
details[open]>summary .chev{transform:rotate(180deg)}
.pages{flex:none;font-size:12px;color:color-mix(in srgb,var(--color-text) 45%,transparent);
  margin-top:6px}
.body{margin-top:16px;font-size:16px;line-height:1.7;
  color:color-mix(in srgb,var(--color-text) 88%,transparent)}
.points{margin:0;padding-left:22px}
.points li{margin-bottom:10px}
.pt{font-weight:600}
.dt{color:color-mix(in srgb,var(--color-text) 62%,transparent);font-size:15px}
.q{padding:18px 20px;border-radius:22px;background:#fff;margin-bottom:12px}
.q-stem{font-weight:600;margin-bottom:12px;font-size:15.5px}
.opts{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:7px}
.opt{display:flex;gap:10px;align-items:flex-start;padding:9px 14px;border-radius:999px;
  background:var(--color-neutral-100);font-size:14.5px}
.opt.right{background:var(--use-bg);color:var(--use-fg);font-weight:600}
.opt-key{flex:none;font-weight:700;opacity:.6}
.exp{margin-top:12px;padding-top:12px;
  border-top:1px solid color-mix(in srgb,var(--color-text) 10%,transparent);
  font-size:14px;color:color-mix(in srgb,var(--color-text) 70%,transparent)}
.cost{margin-top:var(--space-8);padding:26px 28px;border-radius:28px;background:var(--paper)}
.note{font-size:12.5px;color:color-mix(in srgb,var(--color-text) 52%,transparent);
  margin-top:var(--space-3)}
@media (max-width:720px){.pages{display:none}.sec{padding:18px 18px}}

/* Library */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));
  gap:16px;margin-top:var(--space-6)}
.pack-card{display:flex;flex-direction:column;gap:10px;padding:22px 24px;
  border-radius:28px;background:var(--paper);text-decoration:none;color:inherit;
  transition:transform .16s ease,box-shadow .16s ease}
.pack-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}
.pack-card h3{font-size:19px;margin:0}
.pack-meta{display:flex;align-items:center;gap:8px;font-size:12px;
  color:color-mix(in srgb,var(--color-text) 50%,transparent);margin-top:auto}
.tier-bar{display:flex;height:8px;border-radius:999px;overflow:hidden;
  background:var(--color-neutral-200)}
.tier-bar span{display:block;height:100%}
/* Empty state */
.empty{text-align:center;padding:80px 20px;max-width:520px;margin:0 auto}
.empty-mark{width:74px;height:74px;border-radius:26px;background:var(--paper);
  display:grid;place-items:center;margin:0 auto var(--space-4);font-size:30px}
/* Upload */
/* display:block because this is a <label>, which is inline by default - its
   padding would otherwise overlap whatever sits above it rather than push it. */
.drop{display:block;
  border:2px dashed color-mix(in srgb,var(--color-text) 22%,transparent);
  border-radius:28px;padding:56px 28px;text-align:center;background:var(--paper);
  cursor:pointer;transition:border-color .16s ease,background .16s ease}
.drop:hover,.drop.over{border-color:var(--color-accent);
  background:color-mix(in srgb,var(--color-accent) 5%,var(--paper))}
.drop input{display:none}
.filename{font-weight:600;margin-top:10px;color:var(--color-accent-700)}
/* Processing */
.stages{display:flex;flex-direction:column;gap:12px;max-width:460px;margin:var(--space-6) auto 0}
.stage{display:flex;align-items:center;gap:12px;padding:14px 18px;border-radius:999px;
  background:var(--paper);font-size:14.5px}
.stage.done{background:var(--use-bg);color:var(--use-fg)}
.stage.active{background:var(--must-bg);color:var(--must-fg)}
.stage .mark{width:22px;height:22px;border-radius:999px;flex:none;display:grid;
  place-items:center;font-size:12px;background:color-mix(in srgb,var(--color-text) 10%,transparent)}
.stage.done .mark{background:var(--use-dot);color:#fff}
.stage.active .mark{background:var(--must-dot);color:#fff;animation:pulse 1.4s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:.55}50%{opacity:1}}
.spin{animation:spin 1s linear infinite;display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}
/* Test mode */
.test-wrap{max-width:720px;margin:0 auto}
.progress{height:8px;border-radius:999px;background:var(--color-neutral-200);
  overflow:hidden;margin-bottom:var(--space-6)}
.progress span{display:block;height:100%;background:var(--color-accent);
  border-radius:999px;transition:width .3s ease}
.choice{display:block;width:100%;text-align:left;padding:15px 20px;border-radius:999px;
  background:var(--paper);border:1px solid transparent;font:inherit;font-size:15px;
  cursor:pointer;margin-bottom:10px;transition:background .14s ease}
.choice:hover{background:color-mix(in srgb,var(--color-accent) 8%,var(--paper))}
.choice .k{font-weight:700;opacity:.55;margin-right:10px}
.choice.correct{background:var(--use-bg);color:var(--use-fg);border-color:var(--use-dot)}
.choice.wrong{background:var(--must-bg);color:var(--must-fg);border-color:var(--must-dot)}
.choice:disabled{cursor:default}
.feedback{padding:18px 22px;border-radius:24px;margin-top:var(--space-4);font-size:14.5px}
.score-ring{font-family:var(--font-heading);font-size:56px;text-align:center;
  color:var(--color-accent-700)}
/* Flashcards */
.card-stage{max-width:620px;margin:0 auto}
/* Flashcard. Two faces on a single sheet that turns, rather than the answer
   appearing underneath the question — a card you turn over is the mental model
   people already have, and seeing the question leave makes the moment of recall
   feel like a commitment rather than a scroll. */
.flip-scene{perspective:1600px;cursor:pointer;min-height:270px}
.flip{position:relative;width:100%;height:100%;min-height:270px;
  transform-style:preserve-3d;transition:transform .55s cubic-bezier(.2,.75,.3,1)}
.flip.turned{transform:rotateY(180deg)}
.flip-face{position:absolute;inset:0;backface-visibility:hidden;
  -webkit-backface-visibility:hidden;border-radius:32px;background:var(--paper);
  padding:40px 36px;display:flex;flex-direction:column;align-items:center;
  justify-content:center;text-align:center;overflow-y:auto;
  box-shadow:var(--shadow-sm);transition:box-shadow .18s ease}
.flip-scene:hover .flip-face{box-shadow:var(--shadow-md)}
/* The reverse is pre-rotated so that turning the sheet brings it upright. */
.flip-face.answer{transform:rotateY(180deg);background:#fff}
.flip .side-label{position:absolute;top:18px;left:24px;font-size:10.5px;
  letter-spacing:0.1em;text-transform:uppercase;
  color:color-mix(in srgb,var(--color-text) 40%,transparent)}
.flip .front{font-family:var(--font-heading);font-size:24px;line-height:1.25}
.flip .back{font-size:18px;line-height:1.6}
.flip .hint{position:absolute;bottom:22px;left:0;right:0;font-size:12.5px;
  color:color-mix(in srgb,var(--color-text) 42%,transparent)}
/* A card that spins is decoration; for anyone who has asked not to be moved,
   swap the faces instantly instead. */
@media (prefers-reduced-motion: reduce){
  .flip{transition:none}
}
.grades{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;
  margin-top:var(--space-4)}
.grades.two{grid-template-columns:repeat(2,1fr);gap:12px}
.grades.two .grade{padding:16px 10px}
.grade{padding:13px 8px;border-radius:20px;border:1px solid var(--color-divider);
  background:var(--color-bg);cursor:pointer;font:inherit;text-align:center;
  transition:transform .12s ease,background .12s ease}
.grade:hover{transform:translateY(-2px)}
.grade b{display:block;font-family:var(--font-heading);font-size:15px}
.grade span{display:block;font-size:11px;margin-top:3px;
  color:color-mix(in srgb,var(--color-text) 50%,transparent)}
.grade.again{background:var(--must-bg);border-color:var(--must-dot);color:var(--must-fg)}
.grade.easy{background:var(--use-bg);border-color:var(--use-dot);color:var(--use-fg)}
.deck-meta{display:flex;gap:8px;justify-content:center;margin-bottom:var(--space-6);
  flex-wrap:wrap}
/* Tabs */
.tabs{display:inline-flex;border-radius:999px;background:var(--paper);padding:5px;gap:4px}
.tabs a{padding:8px 18px;border-radius:999px;text-decoration:none;color:inherit;
  font-size:14px}
.tabs a[aria-current=page]{background:var(--color-accent);color:#fff}
.tabs a.disabled{opacity:.4;pointer-events:none}
/* Sidebar shell */
.shell{display:grid;grid-template-columns:250px 1fr;gap:var(--space-8);
  max-width:1180px;margin:0 auto;padding:0 clamp(18px,4vw,44px) 80px}
.outline{position:sticky;top:80px;align-self:start;max-height:calc(100vh-120px);
  overflow-y:auto;font-size:13.5px}
.outline a{display:flex;gap:8px;align-items:baseline;padding:7px 10px;border-radius:12px;
  text-decoration:none;color:inherit;line-height:1.35}
.outline a:hover{background:color-mix(in srgb,var(--color-text) 6%,transparent)}
@media (max-width:980px){.shell{grid-template-columns:1fr}.outline{display:none}}