/* Layout: one dark navy world lifted straight from the app. Split hero with real phones, then a numbered round (a true sequence), a university section, a modes strip and a closing call. */
:root{
  --navy-900:#070f1d;      /* page ground, deeper than the app header */
  --navy-800:#0a1a30;      /* app header navy */
  --slate-700:#161b24;     /* app card surface */
  --slate-600:#1f2532;     /* raised card / tile */
  --line:#263043;          /* hairlines, tile borders */
  --ink:#eef3f8;           /* primary text */
  --ink-soft:#a7b3c4;      /* secondary text, blue-biased */
  --teal:#2dc4b6;          /* the M tile, Start Quiz */
  --cyan:#22d3ee;          /* wordmark, MediBattle */
  --violet:#8b5cf6;        /* university, achievements */
  --amber:#f5a524;         /* speed bonus, medium */
  --font-display:"Sora", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-body:"Manrope", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-tile:"JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --r-lg:28px; --r-md:18px; --r-sm:12px;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--navy-900);color:var(--ink);font-family:var(--font-body);font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased}
::selection{background:var(--teal);color:var(--navy-900)}
a{color:var(--cyan);text-underline-offset:3px}
a:focus-visible,button:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:8px}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1160px;margin:0 auto;padding-inline:clamp(16px,4vw,40px)}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance;margin:0;letter-spacing:-0.02em;line-height:1.08}
p{margin:0}

/* nav */
.nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:10;background:color-mix(in srgb,var(--navy-800) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:14px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand-m{width:36px;height:36px;border-radius:10px;background:var(--teal);display:grid;place-items:center;font-family:var(--font-display);font-weight:800;color:#fff;font-size:18px}
.wordmark{font-family:var(--font-display);font-weight:800;font-size:22px;letter-spacing:-0.03em}
.wordmark span{color:var(--cyan)}
.nav-links{display:flex;align-items:center;gap:22px}
.nav-links a.text{color:var(--ink-soft);text-decoration:none;font-weight:600;font-size:15px}
.nav-links a.text:hover{color:var(--ink)}
@media (max-width:720px){.nav-links a.text{display:none}}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:10px;padding:14px 22px;border-radius:14px;font-weight:700;font-size:16px;text-decoration:none;transition:transform .2s cubic-bezier(.2,.8,.2,1),box-shadow .2s,background .2s}
.btn-primary{background:var(--teal);color:#05211e;box-shadow:0 10px 30px -12px rgba(45,196,182,.7)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 36px -14px rgba(45,196,182,.85)}
.btn-ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line)}
.btn-ghost:hover{transform:translateY(-2px);border-color:var(--cyan)}
.btn-small{padding:9px 16px;font-size:14px;border-radius:11px}
.btn svg{width:18px;height:18px;flex:none}

/* hero */
.hero{padding-block:clamp(48px,8vw,96px) clamp(40px,6vw,72px);position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:-20% -10% auto auto;width:720px;height:720px;background:radial-gradient(closest-side,rgba(34,211,238,.13),transparent);pointer-events:none}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(32px,5vw,64px);align-items:center}
.hero-copy{min-width:0;display:flex;flex-direction:column;gap:26px}
.tiles{display:flex;gap:8px;flex-wrap:wrap}
.tile{width:clamp(44px,6vw,58px);aspect-ratio:1;border-radius:12px;display:grid;place-items:center;font-family:var(--font-tile);font-weight:600;font-size:clamp(20px,2.6vw,26px);background:var(--slate-600);border:1.5px solid var(--line);color:var(--ink-soft)}
.tile.hit{background:#0f3a3f;border-color:var(--cyan);color:var(--cyan);box-shadow:0 6px 18px -8px rgba(34,211,238,.6)}
.tiles-caption{font-size:14px;color:var(--ink-soft);margin-top:-14px}
.tiles-caption b{color:var(--ink);font-weight:700}
.hero h1{font-size:clamp(40px,6.2vw,72px);font-weight:800}
.hero h1 em{font-style:normal;color:var(--cyan)}
.lede{font-size:clamp(17px,1.6vw,20px);color:var(--ink-soft);max-width:34em}
.cta-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px 20px}
.cta-note{font-size:14px;color:var(--ink-soft)}
.courses{display:flex;flex-wrap:wrap;gap:8px}
.chip{font-size:13px;font-weight:600;padding:6px 12px;border-radius:999px;border:1px solid var(--line);color:var(--ink-soft);background:var(--slate-700)}

/* phones */
.phones{position:relative;min-height:560px;min-width:0}
.phone{position:absolute;width:min(270px,60%);border-radius:38px;padding:9px;background:#0b0f16;border:1px solid #2a3344;box-shadow:0 40px 80px -30px rgba(0,0,0,.8),0 0 0 1px rgba(255,255,255,.03) inset}
.phone img{border-radius:30px;width:100%}
.phone.front{right:6%;top:0;z-index:2}
.phone.back{left:2%;top:70px;transform:rotate(-6deg);opacity:.92}
@media (max-width:860px){
  .hero-grid{grid-template-columns:1fr}
  .phones{min-height:0;display:flex;justify-content:center;gap:14px;padding-block:8px}
  .phone{position:relative;inset:auto;width:min(230px,46%)}
  .phone.back{transform:rotate(-4deg);top:24px}
}

/* tile reveal: letters already visible at rest, one flip on load */
@media (prefers-reduced-motion:no-preference){
  .tile.hit{animation:flip .7s cubic-bezier(.2,.8,.2,1) both}
  .tile.hit:nth-child(2){animation-delay:.15s}.tile.hit:nth-child(5){animation-delay:.3s}.tile.hit:nth-child(6){animation-delay:.45s}
  @keyframes flip{0%{transform:rotateX(0)}45%{transform:rotateX(90deg);filter:brightness(1.6)}100%{transform:rotateX(0)}}
}

/* sections */
section{padding-block:clamp(64px,9vw,112px)}
.section-head{display:flex;flex-direction:column;gap:14px;max-width:40em;margin-bottom:clamp(36px,5vw,56px)}
.section-head h2{font-size:clamp(30px,4.2vw,48px);font-weight:800}
.section-head p{color:var(--ink-soft);font-size:18px}

/* round */
.round{background:linear-gradient(180deg,var(--navy-900),var(--navy-800) 40%,var(--navy-900))}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(20px,3vw,36px)}
.step{display:flex;flex-direction:column;gap:18px;min-width:0}
.step-shot{border-radius:24px;overflow:hidden;border:1px solid var(--line);background:var(--slate-700);aspect-ratio:9/11}
.step-shot img{width:100%;height:100%;object-fit:cover;object-position:top}
.step-num{font-family:var(--font-tile);font-weight:600;font-size:14px;color:var(--teal)}
.step h3{font-size:22px;font-weight:700}
.step p{color:var(--ink-soft);font-size:16px}
@media (max-width:860px){.steps{grid-template-columns:1fr;max-width:460px}}

/* universities */
.uni-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(32px,6vw,80px);align-items:center}
.uni-shot{max-width:340px;justify-self:center;border-radius:32px;overflow:hidden;border:1px solid #3a2c5f;box-shadow:0 40px 80px -40px rgba(139,92,246,.55)}
.uni-copy{display:flex;flex-direction:column;gap:22px;min-width:0}
.uni-copy h2{font-size:clamp(32px,4.6vw,54px);font-weight:800}
.uni-copy h2 span{color:var(--violet)}
.uni-copy p{color:var(--ink-soft);font-size:18px;max-width:32em}
.board{border:1px solid var(--line);border-radius:var(--r-md);background:var(--slate-700);overflow:hidden}
.board-row{display:grid;grid-template-columns:2.2em 1fr auto;gap:12px;align-items:center;padding:13px 18px;border-top:1px solid var(--line);font-size:15px}
.board-row:first-child{border-top:0}
.board-row .rank{font-family:var(--font-tile);color:var(--ink-soft);font-variant-numeric:tabular-nums}
.board-row .pts{font-variant-numeric:tabular-nums;color:var(--ink-soft);font-weight:600}
.board-row.you{background:rgba(139,92,246,.12)}
.board-row.you .rank,.board-row.you .pts{color:var(--violet)}
.board-note{font-size:13px;color:var(--ink-soft)}
@media (max-width:860px){.uni-grid{grid-template-columns:1fr}.uni-shot{max-width:280px}}

/* modes */
.modes{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(18px,3vw,32px)}
.mode{display:flex;flex-direction:column;gap:14px;min-width:0}
.mode .shot{border-radius:24px;overflow:hidden;border:1px solid var(--line);aspect-ratio:9/12}
.mode .shot img{width:100%;height:100%;object-fit:cover;object-position:top}
.mode h3{font-size:20px;font-weight:700}
.mode p{color:var(--ink-soft);font-size:15px}
@media (max-width:860px){.modes{grid-template-columns:1fr 1fr}.mode:last-child{grid-column:1/-1;max-width:50%}}
@media (max-width:520px){.modes{grid-template-columns:1fr}.mode:last-child{max-width:none}}

/* close */
.close{padding-block:clamp(64px,9vw,104px)}
.close-card{border-radius:var(--r-lg);background:radial-gradient(120% 140% at 0% 0%,#0f3a3f 0%,var(--navy-800) 55%);border:1px solid #1d4a52;padding:clamp(32px,6vw,64px);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:28px}
.close-card h2{font-size:clamp(28px,4vw,44px);font-weight:800;max-width:15em}
.close-card p{color:var(--ink-soft);margin-top:10px}

/* footer */
footer{border-top:1px solid var(--line);padding-block:36px 48px;font-size:14px;color:var(--ink-soft)}
footer .wrap{display:flex;flex-wrap:wrap;gap:20px 40px;justify-content:space-between;align-items:flex-start}
.foot-links{display:flex;flex-wrap:wrap;gap:10px 22px}
.foot-links a{color:var(--ink-soft);text-decoration:none}
.foot-links a:hover{color:var(--ink)}
.email{user-select:all;color:var(--ink)}

/* inner pages */
.page{padding-block:clamp(48px,8vw,96px)}
.page .wrap{max-width:760px}
.page h1{font-size:clamp(36px,5.4vw,56px);font-weight:800;margin-bottom:18px}
.page .intro{font-size:clamp(17px,1.6vw,20px);color:var(--ink-soft);margin-bottom:clamp(32px,5vw,48px)}
.doc{display:flex;flex-direction:column;gap:36px}
.doc section{padding:0;display:flex;flex-direction:column;gap:12px}
.doc h2{font-size:24px;font-weight:700}
.doc p,.doc li{color:var(--ink-soft)}
.doc ul{margin:0;padding-left:1.2em;display:flex;flex-direction:column;gap:6px}
.doc li::marker{color:var(--teal)}
.callout{border:1px solid #1d4a52;background:#0c2a33;border-radius:var(--r-md);padding:20px 22px}
.callout p{color:var(--ink)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,40px);align-items:start}
@media (max-width:760px){.contact-grid{grid-template-columns:1fr}}
.card{border:1px solid var(--line);background:var(--slate-700);border-radius:var(--r-md);padding:clamp(20px,3vw,28px);display:flex;flex-direction:column;gap:16px;min-width:0}
.card h2{font-size:22px;font-weight:700}
form{display:flex;flex-direction:column;gap:16px}
label{font-weight:600;font-size:15px;display:flex;flex-direction:column;gap:8px}
input[type=email],textarea{font:inherit;color:var(--ink);background:var(--navy-900);border:1px solid var(--line);border-radius:var(--r-sm);padding:12px 14px;width:100%}
input[type=email]:focus,textarea:focus{outline:2px solid var(--cyan);outline-offset:1px;border-color:transparent}
textarea{min-height:150px;resize:vertical}
.consent{flex-direction:row;align-items:flex-start;gap:10px;font-weight:500;font-size:14px;color:var(--ink-soft)}
.consent input{margin-top:4px;accent-color:var(--teal);flex:none}
.req{font-size:13px;color:var(--ink-soft)}
button.btn{border:0;cursor:pointer;font-family:inherit;align-self:flex-start}
.hidden-field{position:absolute;left:-9999px}

/* Play in your browser */
.web-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:clamp(32px,5vw,72px);align-items:center}
.web-copy{display:flex;flex-direction:column;gap:18px;min-width:0}
.web-copy h2{font-size:clamp(30px,4.2vw,48px);font-weight:800;line-height:1.1}
.web-copy h2 span{color:var(--cyan)}
.web-copy>p{color:var(--ink-soft);font-size:18px;margin:0}
.web-list{list-style:none;padding:0;margin:4px 0 8px;display:flex;flex-direction:column;gap:12px}
.web-list li{padding-left:28px;position:relative;color:var(--ink-soft);font-size:16px}
.web-list li::before{content:"";position:absolute;left:0;top:.45em;width:14px;height:14px;border-radius:4px;background:var(--teal)}
.web-list strong{color:var(--ink)}
.web-devices{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.device{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;aspect-ratio:1/1;border-radius:var(--r-md);border:1px solid var(--line);background:var(--slate-700);color:var(--cyan);font-weight:700;font-size:15px}
.device span{color:var(--ink)}
.device svg{width:44px;height:44px}
@media (max-width:860px){.web-grid{grid-template-columns:1fr}.web-devices{grid-template-columns:repeat(4,1fr);gap:10px}.device{aspect-ratio:auto;padding:16px 6px;font-size:13px}.device svg{width:30px;height:30px}}

/* SEO pages: glossary, word pages, landing pages */
.crumbs{font-size:14px;color:var(--ink-soft);margin-bottom:22px;display:flex;flex-wrap:wrap;gap:6px}
.crumbs a{color:var(--ink-soft);text-decoration:none}
.crumbs a:hover{color:var(--cyan)}
.kicker{font-family:var(--font-tile);font-size:13px;color:var(--teal);margin-bottom:10px;letter-spacing:.02em}
.kicker a{color:var(--teal);text-decoration:none}
.muted{color:var(--ink-soft);font-size:14px}
.word-grid{list-style:none;padding:0!important;margin:0;display:grid!important;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:8px!important}
.word-grid li::marker{content:none}
.word-grid a{display:block;padding:10px 14px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--slate-700);color:var(--ink);text-decoration:none;font-weight:600;font-size:15px}
.word-grid a:hover{border-color:var(--cyan);color:var(--cyan)}
.topic-list{columns:2;column-gap:32px;display:block!important}
.topic-list li{break-inside:avoid;margin-bottom:6px}
@media (max-width:560px){.topic-list{columns:1}}
.az{display:flex;flex-wrap:wrap;gap:6px}
.az a{font-family:var(--font-tile);width:34px;height:34px;display:grid;place-items:center;border:1px solid var(--line);border-radius:9px;color:var(--ink);text-decoration:none;font-size:14px}
.az a:hover{border-color:var(--cyan);color:var(--cyan)}
.quiz{display:flex;flex-direction:column;gap:18px}
.q{border:1px solid var(--line);background:var(--slate-700);border-radius:var(--r-md);padding:18px 20px;display:flex;flex-direction:column;gap:12px}
.q-text{color:var(--ink)!important}
.q-opts{display:grid;grid-template-columns:1fr 1fr;gap:8px}
@media (max-width:520px){.q-opts{grid-template-columns:1fr}}
.q-opt{font:inherit;font-weight:600;font-size:15px;text-align:left;padding:11px 14px;border-radius:var(--r-sm);border:1.5px solid var(--line);background:var(--navy-900);color:var(--ink);cursor:pointer}
.q-opt:hover:not(:disabled){border-color:var(--cyan)}
.q-opt.right{border-color:var(--teal);background:#0c2a33;color:var(--teal)}
.q-opt.wrong{border-color:#f87171;color:#fca5a5}
.q-opt:disabled{cursor:default}
.q-res{font-weight:700;color:var(--ink)!important}
.seo-cta{margin-block:8px}
.seo-cta .cta-row{gap:12px}
.faq-q{font-size:18px;font-weight:700;margin-top:6px}
.page .intro b{color:var(--ink)}
.doc section.callout{padding:16px 20px}

/* Study guides and word of the day */
.tbl{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-md);background:var(--slate-700)}
.tbl table{width:100%;border-collapse:collapse;font-size:15px}
.tbl th{text-align:left;font-family:var(--font-tile);font-size:13px;color:var(--teal);padding:12px 14px;border-bottom:1px solid var(--line)}
.tbl td{padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl tr:last-child td{border-bottom:0}
.tbl td a{color:var(--cyan)}
.guide-list{list-style:none;padding:0!important;display:grid!important;gap:12px!important}
.guide-list li::marker{content:none}
.guide-list li{border:1px solid var(--line);border-radius:var(--r-md);background:var(--slate-700);padding:16px 18px}
.guide-list a{color:var(--ink);text-decoration:none;font-size:17px}
.guide-list a:hover{color:var(--cyan)}
.doc .wotd,.wotd{border:1px solid var(--line);border-radius:var(--r-lg);background:var(--slate-700);padding:24px!important}
.wotd h2{font-size:clamp(30px,6vw,44px);margin:4px 0 12px}