/* ============ Design tokens ============ */
:root{
  --bg:#f6f4ef; --bg-2:#efece4;
  --surface:#ffffff; --surface-2:#fbfaf6;
  --ink:#13201d; --ink-soft:#506460; --ink-faint:#839691;
  --line:#e3ded2; --line-soft:#eeeae0;
  --brand:#0d7a5f; --brand-2:#0a6049; --brand-soft:#e6f4ef;
  --accent:#c9762a; --accent-soft:#fdf1e3;
  --ok:#0f8a5f; --ok-soft:#e7f6ef;
  --bad:#c3402f; --bad-soft:#fdecea;
  --warn:#a8791b; --warn-soft:#fdf6e3;
  --shadow-sm:0 1px 2px rgba(19,32,29,.05),0 1px 3px rgba(19,32,29,.04);
  --shadow:0 2px 4px rgba(19,32,29,.04),0 12px 28px -12px rgba(19,32,29,.16);
  --shadow-lg:0 30px 60px -30px rgba(13,122,95,.35);
  --r-sm:10px; --r:14px; --r-lg:20px; --r-xl:28px;
  --font-sans:"Inter",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-display:"Fraunces",ui-serif,Georgia,"Times New Roman",serif;
  --maxw:1140px;
}
html[data-theme="dark"]{
  --bg:#0b1210; --bg-2:#0f1815;
  --surface:#121c19; --surface-2:#16211e;
  --ink:#e9f2ee; --ink-soft:#a9bdb6; --ink-faint:#7d918b;
  --line:#233029; --line-soft:#1b2622;
  --brand:#3ecfa2; --brand-2:#2bb489; --brand-soft:#123028;
  --accent:#e8a962; --accent-soft:#2a2015;
  --ok:#43d69f; --ok-soft:#102b22;
  --bad:#f38b7c; --bad-soft:#2d1714;
  --warn:#e2bb6a; --warn-soft:#2a2314;
  --shadow-sm:0 1px 2px rgba(0,0,0,.4);
  --shadow:0 2px 6px rgba(0,0,0,.35),0 18px 40px -20px rgba(0,0,0,.7);
  --shadow-lg:0 30px 60px -30px rgba(0,0,0,.8);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--font-sans);font-size:16px;line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--brand-2);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2.5px solid var(--brand);outline-offset:3px;border-radius:6px}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* ============ Nav ============ */
.navbar{
  position:sticky;top:0;z-index:60;
  background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line-soft);
}
.nav-inner{display:flex;align-items:center;gap:18px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:650;color:var(--ink);letter-spacing:-.01em}
.logo:hover{text-decoration:none}
.logo-mark{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(150deg,var(--brand),var(--brand-2));
  color:#fff;font-size:11.5px;font-weight:800;letter-spacing:.04em;
  box-shadow:0 6px 14px -6px rgba(13,122,95,.7);
}
.logo-text{font-size:15.5px}
.nav-links{margin-left:auto;display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.nav-links a{padding:8px 12px;border-radius:9px;color:var(--ink-soft);font-size:14.5px;font-weight:520}
.nav-links a:hover{background:var(--surface-2);color:var(--ink);text-decoration:none}
.icon-btn{
  margin-left:4px;width:36px;height:36px;border-radius:10px;border:1px solid var(--line);
  background:var(--surface);cursor:pointer;display:grid;place-items:center;font-size:15px;color:var(--ink-soft);
  transition:background .18s,transform .18s;
}
.icon-btn:hover{background:var(--surface-2);transform:translateY(-1px)}

/* ============ Buttons ============ */
.btn{
  --btn-bg:var(--surface);--btn-fg:var(--ink);--btn-bd:var(--line);
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:11px;border:1px solid var(--btn-bd);
  background:var(--btn-bg);color:var(--btn-fg);font:inherit;font-weight:600;font-size:14.5px;
  cursor:pointer;transition:transform .16s,box-shadow .18s,background .18s,color .18s;
  text-decoration:none;white-space:nowrap;
}
.btn:hover{transform:translateY(-1.5px);text-decoration:none;box-shadow:var(--shadow-sm)}
.btn-primary{
  --btn-bg:linear-gradient(150deg,var(--brand),var(--brand-2));--btn-fg:#fff;--btn-bd:transparent;
  box-shadow:0 10px 24px -12px rgba(13,122,95,.85);
}
.btn-primary:hover{box-shadow:0 16px 30px -14px rgba(13,122,95,.9)}
html[data-theme="dark"] .btn-primary{--btn-fg:#04120d}
.btn-outline{--btn-bg:transparent;--btn-bd:var(--line);--btn-fg:var(--ink)}
.btn-outline:hover{--btn-bg:var(--surface-2)}
.btn-sm{padding:8px 14px;font-size:13.5px;border-radius:9px}
.btn-lg{padding:14px 26px;font-size:15.5px;border-radius:13px}

/* ============ Hero ============ */
.hero{position:relative;overflow:hidden;padding:76px 0 60px;border-bottom:1px solid var(--line-soft)}
.hero::before,.hero::after{content:"";position:absolute;border-radius:50%;filter:blur(70px);opacity:.5;pointer-events:none}
.hero::before{width:520px;height:520px;right:-120px;top:-200px;background:radial-gradient(circle,color-mix(in srgb,var(--brand) 38%,transparent),transparent 68%)}
.hero::after{width:420px;height:420px;left:-160px;bottom:-220px;background:radial-gradient(circle,color-mix(in srgb,var(--accent) 30%,transparent),transparent 70%)}
.hero-grid{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center}
.badge{
  display:inline-flex;align-items:center;gap:8px;padding:6px 13px;border-radius:999px;
  background:var(--brand-soft);color:var(--brand-2);font-size:12.5px;font-weight:650;letter-spacing:.02em;
  border:1px solid color-mix(in srgb,var(--brand) 22%,transparent);
}
html[data-theme="dark"] .badge{color:var(--brand)}
h1{
  font-family:var(--font-display);font-size:clamp(2.1rem,4.4vw,3.35rem);line-height:1.06;
  letter-spacing:-.025em;margin:18px 0 16px;font-weight:600;
}
h1 .hl{
  background:linear-gradient(100deg,var(--brand),var(--accent));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.lead{font-size:17px;color:var(--ink-soft);max-width:53ch;margin:0 0 26px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:30px}
.stats{display:flex;gap:26px;flex-wrap:wrap}
.stat strong{display:block;font-family:var(--font-display);font-size:22px;letter-spacing:-.02em}
.stat span{font-size:12.5px;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.07em}

.hero-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-xl);
  padding:26px;box-shadow:var(--shadow);
}
.hero-card h3{margin:0 0 4px;font-size:16.5px;letter-spacing:-.01em}
.hero-card>p{margin:0 0 16px;font-size:13.5px;color:var(--ink-soft)}
.quick-links{display:grid;gap:9px}
.quick-link{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:13px 15px;border-radius:var(--r);border:1px solid var(--line);
  background:var(--surface-2);color:var(--ink);transition:.2s;
}
.quick-link:hover{text-decoration:none;border-color:color-mix(in srgb,var(--brand) 40%,var(--line));transform:translateX(3px);background:var(--surface)}
.ql-year{font-weight:640;font-size:14.5px}
.ql-desc{font-size:12px;color:var(--ink-faint);display:block;font-weight:450}
.quick-link .arrow{color:var(--brand);font-weight:700}

/* ============ Sections ============ */
.section{padding:66px 0}
.section-alt{background:var(--bg-2);border-block:1px solid var(--line-soft)}
.section-head{margin-bottom:34px;max-width:62ch}
.section-title{font-family:var(--font-display);font-size:clamp(1.5rem,2.6vw,2rem);letter-spacing:-.02em;margin:0 0 8px;font-weight:600}
.section-sub{margin:0;color:var(--ink-soft);font-size:15px}
.eyebrow{font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--brand);margin:0 0 10px}

/* ============ Cards ============ */
.grid{display:grid;gap:18px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:24px;box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s,border-color .2s;
}
a.card:hover{text-decoration:none;transform:translateY(-3px);box-shadow:var(--shadow);border-color:color-mix(in srgb,var(--brand) 35%,var(--line))}
.card-icon{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;font-size:20px;
  background:var(--brand-soft);margin-bottom:14px;
}
.card h3{margin:0 0 6px;font-size:16.5px;letter-spacing:-.015em}
.card p{margin:0;color:var(--ink-soft);font-size:14px}

.set-card{display:flex;flex-direction:column;gap:10px}
.set-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.pill{
  font-size:11.5px;font-weight:650;padding:4px 10px;border-radius:999px;
  background:var(--surface-2);border:1px solid var(--line);color:var(--ink-soft);white-space:nowrap;
}
.pill-brand{background:var(--brand-soft);border-color:color-mix(in srgb,var(--brand) 22%,transparent);color:var(--brand-2)}
html[data-theme="dark"] .pill-brand{color:var(--brand)}
.pill-warn{background:var(--warn-soft);border-color:color-mix(in srgb,var(--warn) 26%,transparent);color:var(--warn)}
.set-meta{display:flex;gap:14px;flex-wrap:wrap;font-size:12.5px;color:var(--ink-faint)}
.progress{height:7px;border-radius:999px;background:var(--line-soft);overflow:hidden;margin-top:4px}
.progress>span{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--brand),var(--accent));transition:width .5s cubic-bezier(.4,0,.2,1)}

/* ============ Quiz header ============ */
.page-head{
  padding:38px 0 26px;border-bottom:1px solid var(--line-soft);
  background:linear-gradient(180deg,var(--bg-2),var(--bg));
}
.crumb{font-size:13px;color:var(--ink-faint);margin-bottom:12px;display:flex;gap:7px;align-items:center;flex-wrap:wrap}
.crumb a{color:var(--ink-faint)}
.crumb a:hover{color:var(--brand)}
.page-head h1{font-size:clamp(1.7rem,3.2vw,2.5rem);margin:0 0 10px}
.page-head p{margin:0;color:var(--ink-soft);font-size:15px;max-width:70ch}
.head-chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}

/* ============ Sticky quiz bar ============ */
.qbar{
  position:sticky;top:64px;z-index:50;
  background:color-mix(in srgb,var(--surface) 90%,transparent);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.qbar-inner{display:flex;align-items:center;gap:14px;height:56px}
.qbar .progress{flex:1;margin:0;min-width:80px}
.qbar-stats{display:flex;gap:14px;font-size:13px;color:var(--ink-soft);white-space:nowrap}
.qbar-stats b{color:var(--ink);font-weight:680}
.qbar .btn-sm{padding:7px 13px}

/* ============ Toolbar ============ */
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;padding:20px 0 6px}
.search-wrap{position:relative;flex:1;min-width:220px}
.search-wrap svg{position:absolute;left:13px;top:50%;transform:translateY(-50%);opacity:.45}
input[type=search],select{
  width:100%;padding:11px 14px 11px 38px;border-radius:11px;border:1px solid var(--line);
  background:var(--surface);color:var(--ink);font:inherit;font-size:14.5px;
  transition:border-color .18s,box-shadow .18s;
}
select{padding-left:14px;cursor:pointer;width:auto;min-width:150px}
input[type=search]:focus,select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 16%,transparent)}
.chips{display:flex;gap:7px;flex-wrap:wrap}
.chip{
  padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);
  font-size:13px;font-weight:560;color:var(--ink-soft);cursor:pointer;transition:.18s;font-family:inherit;
}
.chip:hover{background:var(--surface-2);color:var(--ink)}
.chip[aria-pressed="true"]{background:var(--brand);border-color:transparent;color:#fff;box-shadow:0 6px 16px -8px rgba(13,122,95,.9)}
html[data-theme="dark"] .chip[aria-pressed="true"]{color:#04120d}
.count-note{font-size:13px;color:var(--ink-faint);margin:12px 0 0}

/* ============ Question ============ */
.qlist{display:grid;gap:16px;padding:10px 0 40px}
.q{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:20px;box-shadow:var(--shadow-sm);scroll-margin-top:140px;
  transition:border-color .2s,box-shadow .2s;
}
.q:hover{border-color:color-mix(in srgb,var(--brand) 25%,var(--line))}
.q.flash{animation:flag 1.1s ease}
@keyframes flag{0%,100%{box-shadow:var(--shadow-sm)}30%{box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 35%,transparent)}}
.q-tags{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:11px;align-items:center}
.q-num{
  font-variant-numeric:tabular-nums;font-size:11.5px;font-weight:750;letter-spacing:.06em;
  color:var(--ink-faint);text-transform:uppercase;
}
.stem{margin:0 0 15px;font-size:15.8px;line-height:1.58;font-weight:470;letter-spacing:-.005em}
.opts{display:grid;gap:8px}
.opt{
  display:flex;align-items:flex-start;gap:12px;padding:11px 14px;border-radius:12px;
  border:1px solid var(--line);background:var(--surface-2);cursor:pointer;
  transition:background .16s,border-color .16s,transform .12s;font-size:14.8px;line-height:1.5;
  text-align:left;color:inherit;font-family:inherit;width:100%;
}
.opt:hover{background:var(--surface);border-color:color-mix(in srgb,var(--brand) 35%,var(--line));transform:translateX(2px)}
.opt .letter{
  flex:0 0 25px;width:25px;height:25px;border-radius:8px;display:grid;place-items:center;
  background:var(--surface);border:1px solid var(--line);font-size:12px;font-weight:750;color:var(--ink-soft);
  transition:.16s;
}
.opt .letter svg{display:none}
.opt.chosen{border-color:var(--brand);background:var(--brand-soft)}
.opt.chosen .letter{background:var(--brand);color:#fff;border-color:transparent}
.opt.correct{border-color:color-mix(in srgb,var(--ok) 55%,var(--line));background:var(--ok-soft)}
.opt.correct .letter{background:var(--ok);color:#fff;border-color:transparent}
.opt.correct .letter b{display:none}
.opt.wrong{border-color:color-mix(in srgb,var(--bad) 50%,var(--line));background:var(--bad-soft)}
.opt.wrong .letter{background:var(--bad);color:#fff;border-color:transparent}
.opt.missed{border-style:dashed;border-color:color-mix(in srgb,var(--ok) 45%,var(--line));background:transparent}
.opt[aria-disabled="true"]{cursor:default}
.opt[aria-disabled="true"]:hover{transform:none;background:var(--surface-2)}
.opt.correct[aria-disabled="true"]:hover{background:var(--ok-soft)}
.opt.wrong[aria-disabled="true"]:hover{background:var(--bad-soft)}
.fb{
  display:flex;gap:9px;align-items:flex-start;margin-top:13px;padding:10px 13px;border-radius:11px;
  font-size:13.5px;line-height:1.5;font-weight:520;
}
.fb-ok{background:var(--ok-soft);color:var(--ok)}
.fb-bad{background:var(--bad-soft);color:var(--bad)}
.fb-info{background:var(--warn-soft);color:var(--warn)}
html[data-theme="dark"] .fb-ok,html[data-theme="dark"] .fb-bad,html[data-theme="dark"] .fb-info{color:var(--ink)}
.fb b{font-weight:700}
.check-btn{
  margin-top:10px;padding:9px 16px;border-radius:10px;border:1px solid var(--line);
  background:var(--surface-2);font:inherit;font-size:13.5px;font-weight:600;cursor:pointer;color:var(--ink);
}
.check-btn:hover{background:var(--brand-soft);border-color:var(--brand)}

/* reveal cards (OSCE / flashcards / notes) */
.reveal{
  margin-top:14px;padding:14px 16px;border-radius:12px;background:var(--surface-2);
  border:1px dashed var(--line);font-size:14.2px;line-height:1.62;color:var(--ink-soft);
  white-space:pre-wrap;
}
.reveal.show{display:block;background:var(--brand-soft);border-style:solid;border-color:color-mix(in srgb,var(--brand) 28%,transparent);color:var(--ink)}
.reveal[hidden]{display:none}
.station-fig{border-radius:12px;border:1px solid var(--line);margin:0 0 14px;background:#fff;padding:6px;max-width:520px}
.note-sec{margin-bottom:14px}
.note-sec h3{margin:0 0 4px;font-size:16px}
.note-sec ul{margin:6px 0 0;padding-left:20px;color:var(--ink-soft);font-size:14.5px}
.note-sec li{margin-bottom:5px}

/* ============ Results ============ */
.results{
  margin:20px 0 50px;padding:28px;border-radius:var(--r-xl);
  background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);
}
.results h2{font-family:var(--font-display);margin:0 0 18px;font-size:1.5rem;letter-spacing:-.02em}
.res-top{display:flex;gap:26px;align-items:center;flex-wrap:wrap;margin-bottom:20px}
.donut{--pct:0;width:120px;height:120px;border-radius:50%;flex:0 0 auto;
  background:conic-gradient(var(--brand) calc(var(--pct)*1%),var(--line-soft) 0);
  display:grid;place-items:center;position:relative;transition:background .8s}
.donut::after{content:"";position:absolute;inset:11px;border-radius:50%;background:var(--surface)}
.donut b{position:relative;font-family:var(--font-display);font-size:27px;letter-spacing:-.02em}
.res-verdict{font-size:18px;font-weight:620;margin:0 0 4px}
.res-sub{font-size:14px;color:var(--ink-soft);margin:0}
.res-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:20px}
.res-table{width:100%;border-collapse:collapse;font-size:13.8px}
.res-table th{text-align:left;font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint);padding:8px 10px;border-bottom:1px solid var(--line)}
.res-table td{padding:9px 10px;border-bottom:1px solid var(--line-soft);color:var(--ink-soft)}
.res-table td:first-child{color:var(--ink);font-weight:520}
.mini-bar{height:6px;border-radius:99px;background:var(--line-soft);overflow:hidden;min-width:60px}
.mini-bar>span{display:block;height:100%;background:var(--brand)}
.res-list{margin:0;padding-left:0;list-style:none;font-size:14px;color:var(--ink-soft)}
.res-list li{display:flex;justify-content:space-between;gap:14px;padding:8px 0;border-bottom:1px solid var(--line-soft)}
.res-list strong{color:var(--ink)}
.missed-list{display:flex;gap:7px;flex-wrap:wrap;margin-top:8px}
.missed-list a{
  padding:4px 10px;border-radius:8px;background:var(--bad-soft);color:var(--bad);
  font-size:12.5px;font-weight:650;
}
html[data-theme="dark"] .missed-list a{color:var(--bad)}
.res-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}

.empty{
  text-align:center;padding:60px 20px;border:1px dashed var(--line);border-radius:var(--r-lg);
  color:var(--ink-faint);background:var(--surface-2);
}

/* ============ Footer ============ */
.footer{border-top:1px solid var(--line-soft);padding:34px 0;background:var(--bg-2)}
.footer-inner{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center}
.footer-tag{margin:8px 0 0;font-size:13px;color:var(--ink-faint);max-width:44ch}
.footer-note{font-size:12.5px;color:var(--ink-faint);margin:0}

/* ============ Responsive ============ */
@media (max-width:940px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .grid-3{grid-template-columns:1fr 1fr}
  .res-grid{grid-template-columns:1fr}
  .hero{padding:52px 0 44px}
}
@media (max-width:680px){
  .container{padding:0 16px}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .nav-links a:not(.btn){display:none}
  .nav-inner{gap:10px}
  .qbar{top:0}
  .qbar-inner{height:auto;padding:10px 0;flex-wrap:wrap;gap:9px}
  .qbar .progress{order:3;flex-basis:100%}
  .qbar-stats{font-size:12px;gap:10px}
  .q{padding:16px;border-radius:16px}
  .stem{font-size:15.2px}
  .opt{font-size:14.4px;padding:11px 12px}
  .section{padding:44px 0}
  .hero-card{padding:20px}
  .results{padding:20px}
  .toolbar{gap:8px}
  .search-wrap{flex-basis:100%}
}
@media print{.navbar,.qbar,.toolbar,.res-actions{display:none}}