/* ============================================================================
   Kerr Prep — Companion Site
   Palette matched to the SIE cover: deep navy ink + aqua→cobalt accent on a cool
   off-white ground (no gold). Success/danger stay functional for quiz feedback.
   Headlines = Source Sans (cover), body = Inter. No build step; plain CSS vars.
   ========================================================================== */
:root{
  --ink:#0A1A2C;
  --ink-2:#14304c;
  --ink-soft:#33506e;
  --paper:#FBFAF6;
  --surface:#ffffff;
  /* brand accent — aqua (bright fills) / cobalt (text & deep accents) */
  --accent:#3BC9D6;
  --accent-2:#2E6BE6;
  --accent-deep:#2E6BE6;
  --accent-tint:#E4F4FB;
  --grad:linear-gradient(90deg,#3BC9D6,#2E6BE6);
  /* legacy aliases — older selectors/JS still reference --gold*; map to accent */
  --gold:var(--accent);
  --gold-deep:var(--accent-deep);
  --gold-tint:var(--accent-tint);
  --success:#1C8A57;
  --success-tint:#E4F3EB;
  --danger:#C0392B;
  --danger-tint:#FBE9E7;
  --muted:#5d6f80;
  --line:#E6E8EC;
  --line-strong:#d3d8df;
  --shadow:0 1px 2px rgba(10,26,44,.06),0 8px 24px rgba(10,26,44,.08);
  --shadow-lg:0 12px 40px rgba(10,26,44,.15);
  --radius:14px;
  --radius-sm:10px;
  --maxw:1120px;
  --display:"Source Sans 3","Source Sans Pro",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--sans);
  color:var(--ink);
  background:var(--paper);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--display);font-weight:600;line-height:1.12;color:var(--ink);margin:0 0 .5em}
h1{font-size:clamp(2.1rem,4.6vw,3.5rem);letter-spacing:-.5px}
h2{font-size:clamp(1.6rem,3vw,2.3rem);letter-spacing:-.3px}
h3{font-size:1.25rem}
p{margin:0 0 1rem}
a{color:var(--ink-2);text-decoration-color:var(--line-strong);text-underline-offset:3px}
a:hover{color:var(--gold-deep)}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.muted{color:var(--muted)}
.center{text-align:center}

/* ---- Buttons ---- */
.btn{
  display:inline-flex;align-items:center;gap:.5em;
  font-family:var(--sans);font-weight:600;font-size:1rem;
  padding:.85em 1.5em;border-radius:999px;border:1.5px solid transparent;
  cursor:pointer;text-decoration:none;transition:transform .08s ease,box-shadow .15s ease,background .15s ease;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 6px 16px rgba(46,107,230,.32)}
.btn-primary:hover{background:linear-gradient(90deg,#2fbcc9,#2a60d2);color:#fff}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn-ghost:hover{border-color:var(--ink);color:var(--ink)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:var(--ink-2);color:#fff}
.btn-lg{font-size:1.08rem;padding:1em 1.8em}
.btn-block{display:flex;width:100%;justify-content:center}

/* ---- Header ---- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(251,250,246,.85);backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:.55em;font-family:var(--display);font-weight:600;font-size:1.35rem;color:var(--ink);text-decoration:none;letter-spacing:-.2px}
.brand .mark{
  width:30px;height:30px;border-radius:8px;background:var(--ink);color:var(--gold);
  display:grid;place-items:center;font-family:var(--display);font-weight:600;font-size:1.05rem;
}
.brand b{color:var(--gold-deep);font-weight:600}
.nav-links{display:flex;align-items:center;gap:1.6rem}
.nav-links a{color:var(--ink-soft);text-decoration:none;font-weight:500;font-size:.98rem}
.nav-links a:hover{color:var(--ink)}
.nav-cta{margin-left:.4rem}
.nav-toggle{display:none}

/* ---- Hero ---- */
.hero{padding:72px 0 28px;position:relative;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:.5em;font-weight:600;font-size:.82rem;letter-spacing:.08em;text-transform:uppercase;color:var(--gold-deep);background:var(--gold-tint);padding:.4em .9em;border-radius:999px;margin-bottom:1.1rem}
.hero p.lead{font-size:1.18rem;color:var(--ink-soft);max-width:34em;margin-bottom:1.7rem}
.hero-cta{display:flex;gap:.8rem;flex-wrap:wrap;align-items:center}
.hero-note{font-size:.9rem;color:var(--muted);margin-top:1rem}
.hero-note strong{color:var(--ink)}
/* 3D book mockup in the hero (real front cover, tilted with page edge + spine) */
.hero-book{perspective:1600px;display:grid;place-items:center;padding:8px 0}
.hero-book .bk{position:relative;width:clamp(210px,21vw,292px);aspect-ratio:760/983;transform:rotateY(-22deg) rotateX(3deg);transform-style:preserve-3d;border-radius:2px 6px 6px 2px;box-shadow:0 2px 8px rgba(10,26,44,.14),22px 30px 42px rgba(10,26,44,.30);transition:transform .45s cubic-bezier(.2,.7,.2,1)}
.hero-book:hover .bk{transform:rotateY(-13deg) rotateX(2deg)}
.hero-book .bk img{display:block;width:100%;height:100%;object-fit:cover;border-radius:2px 6px 6px 2px;position:relative;z-index:2}
.hero-book .bk::before{content:"";position:absolute;z-index:1;top:1.5%;right:-15px;height:97%;width:17px;background:linear-gradient(90deg,#cfc9bb,#fbf9f4 35%,#e7e1d4 62%,#fbf9f4);transform:rotateY(36deg);transform-origin:left center;border-radius:0 2px 2px 0}
.hero-book .bk::after{content:"";position:absolute;z-index:3;top:0;bottom:0;left:0;width:16px;background:linear-gradient(90deg,rgba(0,0,0,.30),rgba(0,0,0,.05) 60%,transparent);border-radius:2px 0 0 2px;pointer-events:none}
@media (max-width:880px){ .hero-book{padding:6px 0} .hero-book .bk{width:clamp(190px,46vw,250px);transform:rotateY(-16deg) rotateX(2deg)} }

/* Hero visual: dominant book (anchor) + compact live-quiz card at the corner
   + small status chip, on a soft brand glow. (Linear-style single floating accent.) */
.hero-visual{position:relative;height:436px}
.hero-visual::before{content:"";position:absolute;z-index:0;right:2%;top:50%;width:460px;height:460px;max-width:96%;transform:translateY(-50%);background:radial-gradient(closest-side,rgba(59,201,214,.22),rgba(46,107,230,.10) 55%,transparent 72%);pointer-events:none}
.hero-visual .hero-book{position:absolute;z-index:2;top:50%;right:3%;padding:0;transform:translateY(-50%)}
.hero-visual .hero-book .bk{width:clamp(228px,20vw,272px)}
/* compact quiz card */
.qcard-mini{position:absolute;z-index:4;left:0;bottom:6px;width:clamp(244px,23vw,286px);background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:0 26px 58px rgba(10,26,44,.28);padding:15px 15px 0;transform:rotate(-2deg);overflow:hidden}
.qcard-mini .qm-top{display:flex;justify-content:space-between;font-size:.69rem;letter-spacing:.02em;color:var(--muted);margin-bottom:9px}
.qcard-mini .qm-q{font-weight:600;font-size:.9rem;line-height:1.3;margin-bottom:11px;color:var(--ink)}
.qcard-mini .qm-opt{display:flex;align-items:center;gap:.5em;border:1.5px solid var(--line);border-radius:9px;padding:.42em .6em;margin-bottom:.4rem;font-size:.82rem;color:var(--ink-soft)}
.qcard-mini .qm-opt .k{width:20px;height:20px;border-radius:5px;background:var(--paper);display:grid;place-items:center;font-weight:600;font-size:.71rem;flex:none;color:var(--ink-soft)}
.qcard-mini .qm-opt.ok{border-color:var(--success);background:var(--success-tint);color:var(--ink)}
.qcard-mini .qm-opt.ok .k{background:var(--success);color:#fff}
.qcard-mini .qm-why{margin:11px -15px 0;padding:11px 15px;background:var(--success-tint);font-size:.77rem;color:#14633f;line-height:1.4}
.qcard-mini .qm-why strong{color:var(--success)}
@media (max-width:880px){
  .hero-visual{height:auto;display:flex;flex-direction:column;align-items:center;gap:18px;margin-top:8px}
  .hero-visual::before{display:none}
  .hero-visual .hero-book{position:static;transform:none}
  .hero-visual .hero-book .bk{width:200px}
  .qcard-mini{position:static;transform:none;width:min(100%,330px)}
}
.preview-card .pc-head{display:flex;justify-content:space-between;align-items:center;font-size:.82rem;color:var(--muted);margin-bottom:14px}
.preview-card .pc-q{font-weight:600;font-size:1.05rem;margin-bottom:16px;color:var(--ink)}
.preview-card .pc-opt{border:1.5px solid var(--line);border-radius:10px;padding:.7em .9em;margin-bottom:.55rem;font-size:.95rem;display:flex;gap:.7em;align-items:center}
.preview-card .pc-opt .k{width:24px;height:24px;border-radius:6px;background:var(--paper);display:grid;place-items:center;font-weight:600;font-size:.85rem;flex:none}
.preview-card .pc-opt.correct{border-color:var(--success);background:var(--success-tint)}
.preview-card .pc-opt.correct .k{background:var(--success);color:#fff}
.preview-card .pc-exp{font-size:.88rem;color:var(--ink-soft);background:var(--paper);border-radius:10px;padding:.7em .9em;margin-top:.4rem}

/* ---- Trust strip ---- */
.trust{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--surface);margin-top:40px}
.trust-row{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.trust-item{padding:26px 22px;text-align:center;border-right:1px solid var(--line)}
.trust-item:last-child{border-right:0}
.trust-item .n{font-family:var(--display);font-size:1.7rem;color:var(--ink);font-weight:600;line-height:1}
.trust-item .l{font-size:.86rem;color:var(--muted);margin-top:.45rem}

/* ---- Sections ---- */
section.block{padding:64px 0}
.section-head{max-width:40em;margin:0 auto 42px;text-align:center}
.section-head .eyebrow{margin-bottom:.8rem}
.section-head p{color:var(--ink-soft);font-size:1.08rem}

/* feature cards */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.feature .ic{width:44px;height:44px;border-radius:11px;background:var(--gold-tint);color:var(--gold-deep);display:grid;place-items:center;margin-bottom:16px}
.feature h3{margin-bottom:.4rem}
.feature p{font-size:.96rem;color:var(--ink-soft);margin:0}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;counter-reset:step}
.step{position:relative;padding-left:0}
.step .num{font-family:var(--display);font-size:1rem;width:36px;height:36px;border-radius:50%;background:var(--ink);color:var(--gold);display:grid;place-items:center;margin-bottom:14px;font-weight:600}
.step h3{font-size:1.12rem}
.step p{font-size:.96rem;color:var(--ink-soft);margin:0}

/* book band */
.book-band{background:var(--ink);color:#eaf0f6}
.book-band h2,.book-band h3{color:#fff}
.book-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:48px;align-items:center}
.book-cover-wrap{max-width:300px;margin:0 auto}
.book-cover-img{width:100%;height:auto;border-radius:10px;box-shadow:0 18px 50px rgba(0,0,0,.4);border:1px solid rgba(255,255,255,.12)}
.book-cover{aspect-ratio:1/1.5;border-radius:12px;background:linear-gradient(160deg,#16395d,#0b1f33);border:1px solid rgba(255,255,255,.12);box-shadow:var(--shadow-lg);display:flex;flex-direction:column;justify-content:space-between;padding:30px;max-width:300px;margin:0 auto}
.book-cover .bc-top{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--gold)}
.book-cover .bc-title{font-family:var(--display);font-size:2rem;line-height:1.05;color:#fff}
.book-cover .bc-sub{font-size:.9rem;color:#b9c7d6}
.book-cover .bc-author{font-size:.85rem;color:#eaf0f6;border-top:1px solid rgba(255,255,255,.15);padding-top:14px}
.book-list{list-style:none;padding:0;margin:0 0 1.6rem}
.book-list li{padding-left:30px;position:relative;margin-bottom:.7rem;color:#cdd9e5}
.book-list li::before{content:"";position:absolute;left:0;top:.55em;width:16px;height:9px;border-left:2.5px solid var(--gold);border-bottom:2.5px solid var(--gold);transform:rotate(-45deg)}

/* email band */
.email-band{background:var(--gold-tint);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.email-wrap{max-width:38em;margin:0 auto;text-align:center}
.email-form{display:flex;gap:.6rem;margin-top:1.4rem}
.email-form input[type=email]{flex:1;font-family:var(--sans);font-size:1rem;padding:.85em 1.1em;border-radius:999px;border:1.5px solid var(--line-strong);background:#fff}
.email-form input[type=email]:focus{outline:none;border-color:var(--gold-deep);box-shadow:0 0 0 3px rgba(46,107,230,.2)}
.email-fineprint{font-size:.82rem;color:var(--ink-soft);margin-top:1rem}
.form-msg{margin-top:1rem;font-weight:600;display:none}
.form-msg.ok{display:block;color:var(--success)}
.form-msg.err{display:block;color:var(--danger)}

/* FAQ */
.faq{max-width:46em;margin:0 auto}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);margin-bottom:12px;overflow:hidden}
.faq summary{cursor:pointer;padding:18px 22px;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--display);font-size:1.4rem;color:var(--gold-deep);flex:none;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details > div{padding:0 22px 20px;color:var(--ink-soft)}
.faq details > div p{margin:0}

/* About */
.about-grid{display:grid;grid-template-columns:1fr 1.4fr;gap:48px;align-items:center;max-width:60em;margin:0 auto}
.about-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow);text-align:center}
.about-card .avatar{width:84px;height:84px;border-radius:50%;background:var(--ink);color:var(--gold);font-family:var(--display);font-size:2rem;display:grid;place-items:center;margin:0 auto 14px;font-weight:600}

/* CTA band */
.cta-band{background:var(--ink);color:#fff;text-align:center}
.cta-band h2{color:#fff}
.cta-band p{color:#bccadb;max-width:34em;margin:0 auto 1.8rem}

/* ---- Footer ---- */
.site-footer{background:#0a1d30;color:#9fb2c4;padding:54px 0 30px;font-size:.92rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;margin-bottom:34px}
.site-footer .brand{color:#fff;margin-bottom:1rem}
.site-footer .brand .mark{background:#16395d}
.footer-col h4{font-family:var(--sans);font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;color:#6f8298;margin-bottom:1rem;font-weight:600}
.footer-col a{display:block;color:#9fb2c4;text-decoration:none;margin-bottom:.6rem}
.footer-col a:hover{color:#fff}
.footer-legal{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;font-size:.82rem;color:#6f8298;line-height:1.7}
.footer-legal .addr{margin-bottom:.6rem}
.disclaimer{font-size:.78rem;color:#5d7187;margin-top:1rem}

/* ---- Legal pages ---- */
.legal{max-width:48em;margin:0 auto;padding:56px 0}
.legal h1{margin-bottom:.3rem}
.legal .updated{color:var(--muted);margin-bottom:2.5rem}
.legal h2{font-size:1.35rem;margin-top:2.2rem}
.legal h3{font-size:1.08rem;margin-top:1.5rem}
.legal ul{padding-left:1.2rem}
.legal li{margin-bottom:.4rem}

/* ============================ QUIZ APP ============================ */
.quiz-page{min-height:calc(100vh - 68px);display:flex;flex-direction:column}
.quiz-wrap{max-width:680px;margin:0 auto;padding:36px 24px 80px;width:100%;flex:1}

/* start screen */
.quiz-start{text-align:center}
.quiz-start h1{margin-bottom:.4rem}
.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:28px 0 8px}
.mode-card{background:var(--surface);border:2px solid var(--line);border-radius:var(--radius);padding:20px;cursor:pointer;text-align:left;transition:border-color .12s,box-shadow .12s;font-family:var(--sans)}
.mode-card:hover{border-color:var(--line-strong);box-shadow:var(--shadow)}
.mode-card.active{border-color:var(--gold);box-shadow:0 0 0 3px rgba(46,107,230,.18)}
.mode-card h3{font-family:var(--sans);font-size:1.05rem;margin-bottom:.2rem}
.mode-card p{font-size:.88rem;color:var(--muted);margin:0}
.sub-select{margin:18px 0;display:none}
.sub-select.show{display:block}
.mode-badge{display:inline-block;background:var(--gold);color:var(--ink);font-family:var(--sans);font-size:.72rem;font-weight:700;border-radius:999px;padding:.1em .55em;vertical-align:middle;margin-left:.3em}
.kbd-hint{text-align:center;font-size:.82rem;margin-top:14px}
@media (hover:none){.kbd-hint{display:none}}
.opt:focus-visible{outline:none;border-color:var(--gold-deep);box-shadow:0 0 0 3px rgba(46,107,230,.28)}
.btn:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(14,39,64,.25)}
.chip:focus-visible,.mode-card:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(46,107,230,.28)}
#flashMsg{transition:opacity .25s ease}
.sub-select label{font-weight:600;font-size:.9rem;display:block;margin-bottom:.5rem}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.chip{border:1.5px solid var(--line-strong);background:#fff;border-radius:999px;padding:.4em 1em;font-size:.9rem;cursor:pointer;font-family:var(--sans);color:var(--ink-soft)}
.chip.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.len-row{display:flex;gap:8px;justify-content:center;margin-top:8px}

/* progress */
.quiz-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;font-size:.9rem;color:var(--muted)}
.progress{height:8px;background:var(--line);border-radius:999px;overflow:hidden;margin-bottom:28px}
.progress > i{display:block;height:100%;background:var(--gold);border-radius:999px;transition:width .25s ease;width:0}

/* question card */
.qcard{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px}
.qcard .qmeta{font-size:.78rem;letter-spacing:.05em;text-transform:uppercase;color:var(--gold-deep);font-weight:600;margin-bottom:10px}
.qcard .qstem{font-size:1.2rem;font-weight:600;line-height:1.4;margin-bottom:22px;color:var(--ink)}
.opt{display:flex;gap:.8em;align-items:flex-start;width:100%;text-align:left;border:1.5px solid var(--line);background:#fff;border-radius:11px;padding:.85em 1em;margin-bottom:.7rem;cursor:pointer;font-family:var(--sans);font-size:1rem;color:var(--ink);transition:border-color .1s,background .1s}
.opt:hover:not(:disabled){border-color:var(--line-strong);background:var(--paper)}
.opt .key{width:26px;height:26px;border-radius:7px;background:var(--paper);display:grid;place-items:center;font-weight:600;font-size:.9rem;flex:none}
.opt .txt{padding-top:1px}
.opt:disabled{cursor:default}
.opt.correct{border-color:var(--success);background:var(--success-tint)}
.opt.correct .key{background:var(--success);color:#fff}
.opt.wrong{border-color:var(--danger);background:var(--danger-tint)}
.opt.wrong .key{background:var(--danger);color:#fff}
.opt.dim{opacity:.55}
.rationale{margin-top:6px;border-radius:11px;padding:16px 18px;font-size:.96rem;display:none;line-height:1.55}
.rationale.show{display:block}
.rationale.right{background:var(--success-tint);border:1px solid #bfe3cf}
.rationale.wrong{background:var(--danger-tint);border:1px solid #f1cdc8}
.rationale .verdict{font-weight:700;display:block;margin-bottom:.3rem}
.rationale.right .verdict{color:var(--success)}
.rationale.wrong .verdict{color:var(--danger)}
.qnav{display:flex;justify-content:space-between;align-items:center;margin-top:22px}

/* results */
.result-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:34px;text-align:center}
.score-ring{width:140px;height:140px;border-radius:50%;display:grid;place-items:center;margin:0 auto 18px;background:conic-gradient(var(--ring,var(--gold)) var(--p,0%),var(--line) 0)}
.score-ring .inner{width:112px;height:112px;border-radius:50%;background:var(--surface);display:grid;place-items:center;flex-direction:column}
.score-ring .pct{font-family:var(--display);font-size:2rem;font-weight:600;color:var(--ink);line-height:1}
.score-ring .sub{font-size:.78rem;color:var(--muted)}
.breakdown{text-align:left;margin:26px 0;border-top:1px solid var(--line)}
.breakdown .brow{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--line)}
.breakdown .blabel{flex:1;font-size:.94rem}
.breakdown .bbar{flex:none;width:120px;height:8px;background:var(--line);border-radius:999px;overflow:hidden}
.breakdown .bbar > i{display:block;height:100%;background:var(--gold)}
.breakdown .bnum{flex:none;width:48px;text-align:right;font-size:.88rem;color:var(--muted);font-variant-numeric:tabular-nums}

/* result CTAs */
.result-cta{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px;margin-top:20px;text-align:left}
.result-cta.gold{background:var(--gold-tint);border-color:#b8e3ea}
.result-cta h3{margin-bottom:.4rem}
.result-cta p{color:var(--ink-soft);font-size:.96rem;margin-bottom:1rem}
.result-cta .email-form{margin-top:0}
.feedback-link{font-size:.86rem;color:var(--muted);margin-top:.8rem;display:inline-block}

/* ---- Responsive ---- */
@media (max-width:880px){
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .preview-card{transform:none;max-width:420px}
  .features,.steps{grid-template-columns:1fr}
  .trust-row{grid-template-columns:1fr 1fr}
  .trust-item:nth-child(2){border-right:0}
  .trust-item{border-bottom:1px solid var(--line)}
  .book-grid,.about-grid{grid-template-columns:1fr;gap:30px}
  .footer-grid{grid-template-columns:1fr 1fr}
  /* keep the primary CTA in the header on mobile; hide only the text links */
  .nav-links a:not(.nav-cta){display:none}
  .nav-links{gap:0}
  /* app pages: show the short section links, drop the Home button (logo = home) */
  .app-nav a:not(.nav-cta){display:inline-block;font-size:.92rem}
  .app-nav .nav-cta{display:none}
  .app-nav{gap:1.1rem}
}
@media (max-width:430px){
  .app-nav ~ *, .app-nav{gap:.85rem}
  .nav .brand{font-size:1.15rem}
  .nav .brand .mark{width:26px;height:26px;font-size:.95rem}
  .app-nav a:not(.nav-cta){font-size:.85rem}
}
@media (max-width:560px){
  .mode-grid{grid-template-columns:1fr}
  .email-form{flex-direction:column}
  .footer-grid{grid-template-columns:1fr}
  .trust-row{grid-template-columns:1fr}
  .trust-item{border-right:0}
}

/* ============================ EXAM SIMULATOR ============================ */
.exam-facts{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:24px}
.exam-fact{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px 22px;min-width:96px}
.exam-fact .n{font-family:var(--display);font-size:1.7rem;color:var(--ink);line-height:1}
.exam-fact .l{font-size:.82rem;color:var(--muted);margin-top:.3rem}

.exam-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.exam-count{font-size:.9rem;color:var(--muted)}
.exam-clock{font-weight:600;font-variant-numeric:tabular-nums;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:.3em .9em}
.exam-clock #examTimer.low{color:var(--danger)}

.flag-btn{font-family:var(--sans);font-size:.85rem;font-weight:600;border:1.5px solid var(--line-strong);background:#fff;color:var(--ink-soft);border-radius:999px;padding:.3em .8em;cursor:pointer;flex:none}
.flag-btn.on{background:var(--gold-tint);border-color:var(--gold);color:var(--gold-deep)}

.opt.chosen{border-color:var(--ink);background:#f1f5f9}
.opt.chosen .key{background:var(--ink);color:#fff}

.exam-nav-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px;margin-top:22px}
.nav-cell{font-family:var(--sans);font-size:.82rem;font-weight:600;height:38px;border:1.5px solid var(--line);background:#fff;border-radius:8px;cursor:pointer;color:var(--ink-soft);position:relative}
.nav-cell.done{background:var(--ink);color:#fff;border-color:var(--ink)}
.nav-cell.cur{box-shadow:0 0 0 3px rgba(46,107,230,.4);border-color:var(--gold)}
.nav-cell.flag::after{content:"";position:absolute;top:3px;right:3px;width:6px;height:6px;border-radius:50%;background:var(--gold)}

.pass-pill{display:inline-block;font-weight:700;font-size:.85rem;letter-spacing:.06em;text-transform:uppercase;padding:.35em 1em;border-radius:999px}
.pass-pill.pass{background:var(--success-tint);color:var(--success)}
.pass-pill.fail{background:var(--gold-tint);color:var(--gold-deep)}

/* answer review list */
.rev-card{border-top:1px solid var(--line);padding:18px 0}
.rev-card:first-of-type{border-top:0}
.rev-head{display:flex;gap:12px;align-items:flex-start;margin-bottom:12px}
.rev-num{flex:none;width:28px;height:28px;border-radius:7px;display:grid;place-items:center;font-weight:700;font-size:.85rem;color:#fff}
.rev-num.ok{background:var(--success)}
.rev-num.no{background:var(--danger)}
.rev-num.blank{background:var(--muted)}
.rev-stem{font-weight:600;line-height:1.45;padding-top:2px}
.rev-opt{font-size:.94rem;padding:.5em .7em;border-radius:8px;margin-bottom:.35rem;color:var(--ink-soft);background:var(--paper)}
.rev-opt.correct{background:var(--success-tint);color:#14633f}
.rev-opt.wrong{background:var(--danger-tint);color:#8c2c22}
.rev-rat{font-size:.92rem;color:var(--ink-soft);margin-top:.5rem;line-height:1.55}

/* ============================ PROGRESS DASHBOARD ============================ */
.tile-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:18px 0 24px}
.tile{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:18px 16px;text-align:center;box-shadow:var(--shadow)}
.tile-n{font-family:var(--display);font-size:1.8rem;color:var(--ink);line-height:1}
.tile-l{font-size:.82rem;color:var(--ink-soft);margin-top:.4rem;font-weight:600}
.tile-s{font-size:.74rem;color:var(--muted);margin-top:.2rem}

.mastery-row{padding:14px 0;border-top:1px solid var(--line)}
.mastery-row:first-of-type{border-top:0}
.mr-top{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:8px}
.mr-name{font-weight:600;font-size:.96rem}
.mr-acc{font-size:.85rem;color:var(--muted)}
.mr-bar{height:9px;background:var(--line);border-radius:999px;overflow:hidden}
.mr-bar > i{display:block;height:100%;background:var(--gold);border-radius:999px}
.mr-sub{font-size:.78rem;color:var(--muted);margin-top:.4rem}

.weak-list{list-style:none;padding:0;margin:0}
.weak-list li{padding:.4em 0;border-bottom:1px dashed var(--line);font-size:.96rem}
.weak-list li:last-child{border-bottom:0}

.sess-row{display:flex;justify-content:space-between;font-size:.92rem;padding:.5em 0;border-top:1px solid var(--line)}
.sess-row:first-of-type{border-top:0}

@media (max-width:560px){ .tile-grid{grid-template-columns:1fr 1fr} }

/* ============================ GAMIFICATION ============================ */
/* ---- header HUD (daily ring · streak · level) ---- */
.gami-hud{display:inline-flex;align-items:center;gap:.6rem;text-decoration:none;background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:.28rem .7rem .28rem .32rem;box-shadow:var(--shadow);line-height:1}
.gami-hud:hover{border-color:var(--line-strong);color:var(--ink)}
.gami-ring{position:relative;display:inline-grid;place-items:center;flex:none}
.gami-ring svg{transform:rotate(-90deg);display:block}
.gami-ring circle{fill:none;stroke-width:4;stroke-linecap:round}
.gami-ring circle.bg{stroke:var(--line)}
.gami-ring circle.fg{stroke:var(--gold);transition:stroke-dashoffset .5s cubic-bezier(.3,.8,.3,1)}
.gami-ring .gami-ring-num{position:absolute;inset:0;display:grid;place-items:center;font-size:.6rem;font-weight:700;color:var(--ink);font-variant-numeric:tabular-nums}
.gami-streak{display:inline-flex;align-items:center;gap:.18rem;font-weight:700;color:var(--ink);font-size:.95rem;font-variant-numeric:tabular-nums}
.gami-streak svg{width:15px;height:15px;color:var(--gold);filter:drop-shadow(0 1px 1px rgba(46,107,230,.35))}
.gami-streak.dim{color:var(--muted)}
.gami-streak.dim svg{color:var(--line-strong);filter:none}
.gami-level{font-size:.82rem;color:var(--ink-soft);font-weight:600;white-space:nowrap}
.gami-level b{color:var(--ink)}
/* keep the HUD a flex pill even though the app-nav link reset is more specific */
.nav .gami-hud,.app-nav a.gami-hud{display:inline-flex}
@media (max-width:560px){ .gami-hud{gap:.45rem;padding-right:.55rem} .gami-level{display:none} }
/* the HUD itself links to Progress, so drop the text link on small screens to fit */
@media (max-width:480px){ .app-nav a:not(.nav-cta):nth-of-type(3){display:none} .app-nav{gap:.9rem} }

/* floating +XP pop */
.gami-pop{position:fixed;z-index:80;font-weight:800;font-size:.92rem;color:var(--gold-deep);pointer-events:none;animation:gamiPop 1s ease forwards;text-shadow:0 1px 2px rgba(255,255,255,.6)}
.gami-pop.miss{color:var(--muted)}
@keyframes gamiPop{0%{opacity:0;transform:translateY(2px) scale(.9)}18%{opacity:1;transform:translateY(-3px) scale(1)}100%{opacity:0;transform:translateY(-24px) scale(1)}}

/* reward toasts */
.gami-toasts{position:fixed;right:18px;bottom:18px;z-index:90;display:flex;flex-direction:column;gap:10px;max-width:340px;pointer-events:none}
@media (max-width:560px){ .gami-toasts{left:14px;right:14px;bottom:14px;max-width:none} }
.gami-toast{display:flex;gap:.8rem;align-items:center;background:var(--ink);color:#fff;border-radius:14px;padding:.75rem .9rem;box-shadow:var(--shadow-lg);opacity:0;transform:translateY(12px) scale(.98);transition:transform .38s cubic-bezier(.2,.85,.25,1),opacity .38s}
.gami-toast.in{opacity:1;transform:none}
.gami-toast .gt-ic{flex:none;width:42px;height:42px;border-radius:11px;display:grid;place-items:center;background:linear-gradient(150deg,var(--gold),var(--gold-deep));color:#fff;box-shadow:inset 0 0 0 1px rgba(255,255,255,.18)}
.gami-toast .gt-ic svg{width:23px;height:23px}
.gami-toast.level .gt-ic{background:linear-gradient(150deg,#3f74ad,var(--ink-2))}
.gami-toast.daily .gt-ic{background:linear-gradient(150deg,#2aa06a,var(--success))}
.gami-toast .gt-body{display:flex;flex-direction:column;min-width:0}
.gami-toast .gt-tt{font-size:.66rem;letter-spacing:.09em;text-transform:uppercase;color:var(--gold);font-weight:700}
.gami-toast.level .gt-tt{color:#a8caec}
.gami-toast.daily .gt-tt{color:#9fe3c1}
.gami-toast .gt-nm{font-weight:600;font-size:.98rem;line-height:1.25}
.gami-toast .gt-ds{font-size:.79rem;color:#c6d4e2;margin-top:.1rem;line-height:1.35}

/* confetti canvas */
.gami-confetti{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:85}

/* ---- badge medallions (toast + dashboard) ---- */
.gami-badge{display:flex;flex-direction:column;align-items:center;text-align:center;gap:.45rem}
.gami-medal{position:relative;width:64px;height:64px;border-radius:50%;display:grid;place-items:center;color:var(--gold-deep);background:radial-gradient(120% 120% at 30% 25%,#fff,var(--gold-tint));border:2px solid var(--gold);box-shadow:0 5px 14px rgba(46,107,230,.28),inset 0 1px 0 rgba(255,255,255,.7)}
.gami-medal svg{width:31px;height:31px}
.gami-medal.locked{color:#9aa7b3;background:#eef1f4;border-color:var(--line-strong);box-shadow:none}
.gami-medal .lk{position:absolute;right:-2px;bottom:-2px;font-size:.7rem;background:#fff;border:1px solid var(--line-strong);border-radius:50%;width:18px;height:18px;display:grid;place-items:center;filter:grayscale(1)}
.gami-badge .bname{font-size:.74rem;font-weight:600;color:var(--ink);line-height:1.15;max-width:9em}
.gami-badge.locked .bname{color:var(--muted)}

/* ---- dashboard momentum panel ---- */
.gami-panel{background:linear-gradient(180deg,#fff, #f6fdff);border-color:#bfe6ec}
.gami-head{display:flex;align-items:center;gap:1.1rem}
.gami-level-badge{flex:none;width:64px;height:64px;border-radius:16px;background:linear-gradient(155deg,var(--ink-2),var(--ink));color:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:var(--shadow);border:1px solid rgba(255,255,255,.08)}
.gami-level-badge .gami-lvl-num{font-family:var(--display);font-size:1.7rem;line-height:1;color:var(--gold)}
.gami-level-badge .gami-lvl-lbl{font-size:.6rem;letter-spacing:.12em;text-transform:uppercase;color:#b9c7d6;margin-top:.15rem}
.gami-level-wrap{flex:1;min-width:0}
.gami-level-row{display:flex;justify-content:space-between;align-items:baseline;gap:1rem}
.gami-xpbar{height:10px;background:var(--line);border-radius:999px;overflow:hidden;margin:.5rem 0 .3rem}
.gami-xpbar>i{display:block;height:100%;background:linear-gradient(90deg,var(--gold),var(--gold-deep));border-radius:999px;transition:width .6s ease}
.gami-xp-sub{font-size:.8rem}

.gami-stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}
@media (max-width:560px){ .gami-stat-grid{grid-template-columns:1fr} }
.gami-stat{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px 16px;display:flex;align-items:center;gap:.9rem}
.gami-stat .big{font-family:var(--display);font-size:1.7rem;color:var(--ink);line-height:1}
.gami-stat .big .unit{font-family:var(--sans);font-size:.85rem;color:var(--muted);font-weight:600}
.gami-stat-sub{font-size:.76rem;margin-top:.3rem}
.gami-flame{flex:none;width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:radial-gradient(120% 120% at 40% 25%,#fff,var(--gold-tint));border:1px solid #bfe6ec;color:var(--gold-deep)}
.gami-flame svg{width:24px;height:24px}
.gami-flame.dim{color:var(--line-strong);background:#f1f3f6;border-color:var(--line)}
.gami-stat .gami-ring circle.fg{stroke:var(--gold-deep)}

.gami-goal-chips{display:flex;gap:6px;margin-top:.5rem}
.gami-goal-chip{font-family:var(--sans);font-size:.78rem;font-weight:600;border:1.5px solid var(--line-strong);background:#fff;color:var(--ink-soft);border-radius:999px;padding:.15em .6em;cursor:pointer;line-height:1.3}
.gami-goal-chip.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.gami-goal-chip:hover:not(.active){border-color:var(--ink)}

.gami-badges-head{display:flex;justify-content:space-between;align-items:baseline;gap:1rem;margin:24px 0 4px}
.gami-badges-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(82px,1fr));gap:18px 12px;margin-top:14px}

@media (prefers-reduced-motion:reduce){
  .gami-ring circle.fg,.gami-xpbar>i{transition:none}
  .gami-toast{transition:opacity .2s}
  .gami-pop{display:none}
}