:root{
  --navy:#14213d; --navy2:#1e2d54; --amber:#fca311; --amber2:#e8930a; --amber-dk:#b45309;
  --teal:#0d9488; --teal-light:#f0fdfa; --cream:#fffdf7; --grey:#f8f9fb;
  --border:#e8eaf0; --ink:#14213d; --text:#1a1f36; --muted:#64748b; --white:#fff;
  --red:#b91c1c; --red-light:#fef2f2;
  --serif:'DM Serif Display',Georgia,serif; --sans:'Plus Jakarta Sans',system-ui,sans-serif;
  --gutter:clamp(18px,5vw,64px); --shadow:0 4px 24px rgba(20,33,61,.10);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--sans);color:var(--text);background:var(--grey);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit} img{max-width:100%}
:focus-visible{outline:2.5px solid var(--teal);outline-offset:2px;border-radius:4px}

.site-nav{position:sticky;top:0;z-index:100;background:rgba(20,33,61,.97);backdrop-filter:blur(12px);
  padding:0 var(--gutter);display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-logo{color:#fff;font-family:var(--serif);font-size:22px;text-decoration:none}
.nav-logo span{color:var(--amber)}
.nav-links a{color:rgba(255,255,255,.75);text-decoration:none;font-size:14px;font-weight:500;margin-left:24px}
.nav-links a:hover{color:#fff}

.wrap{max-width:820px;margin:0 auto;padding:clamp(28px,5vw,56px) var(--gutter) 90px}
h1{font-family:var(--serif);font-size:clamp(32px,5vw,48px);color:var(--navy);font-weight:400;line-height:1.14;margin-bottom:16px}
h2{font-family:var(--serif);font-size:clamp(22px,3vw,28px);color:var(--navy);font-weight:400;margin-bottom:12px}
.pill{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;
  padding:5px 12px;border-radius:99px;background:rgba(252,163,17,.14);color:var(--amber-dk);
  border:1px solid rgba(252,163,17,.35);margin-bottom:18px}
.lede{font-size:18px;color:var(--muted);line-height:1.7;margin-bottom:26px}
.card{background:var(--white);border:1px solid var(--border);border-radius:16px;padding:clamp(22px,4vw,34px);
  box-shadow:var(--shadow);margin-bottom:22px}
.btn{background:var(--amber);color:var(--navy);font-weight:700;font-size:16px;font-family:var(--sans);
  padding:15px 34px;border-radius:10px;border:none;cursor:pointer;text-decoration:none;display:inline-block;
  transition:background .2s,transform .15s}
.btn:hover{background:var(--amber2);transform:translateY(-2px)}
.btn:disabled{background:var(--border);color:var(--muted);cursor:not-allowed;transform:none}
.btn-ghost{background:transparent;border:1.5px solid var(--border);color:var(--navy);font-weight:600;
  padding:12px 24px;border-radius:10px;cursor:pointer;font-family:var(--sans);font-size:15px}
.btn-ghost:hover{border-color:var(--navy)}
.rules{list-style:none;display:grid;gap:10px;margin:22px 0}
.rules li{padding-left:26px;position:relative;color:var(--text);font-size:15.5px}
.rules li::before{content:'';position:absolute;left:0;top:8px;width:9px;height:9px;border-radius:50%;background:var(--amber)}
.note{background:var(--teal-light);border-left:3px solid var(--teal);padding:16px 18px;border-radius:0 10px 10px 0;
  font-size:14.5px;color:#134e4a;margin:22px 0}

/* test chrome */
.bar{position:sticky;top:64px;z-index:50;background:var(--navy);color:#fff;border-radius:12px;
  padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}
.bar .lbl{font-size:12px;text-transform:uppercase;letter-spacing:.7px;color:rgba(255,255,255,.6);font-weight:700}
.timer{font-family:ui-monospace,Consolas,monospace;font-size:26px;font-weight:700;color:var(--amber);
  font-variant-numeric:tabular-nums;line-height:1}
.timer.low{color:#fca5a5}
.track{height:5px;background:var(--border);border-radius:99px;overflow:hidden;margin-bottom:24px}
.track i{display:block;height:100%;background:var(--amber);width:0;transition:width .3s}

.passage{background:var(--cream);border:1px solid var(--border);border-radius:14px;padding:26px 30px;margin-bottom:22px;
  max-height:min(58vh,560px);overflow-y:auto}
.passage h3{font-family:var(--serif);font-weight:400;color:var(--navy);font-size:24px;margin-bottom:14px}
.passage p{margin-bottom:15px;font-size:17.5px;line-height:1.85}
.passage p:last-child{margin-bottom:0}

.qhead{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.7px;color:var(--muted);margin-bottom:10px}
.instr{font-size:14.5px;color:var(--muted);font-style:italic;margin-bottom:12px}
.qtext{font-size:19px;line-height:1.55;color:var(--navy);font-weight:600;margin-bottom:20px;white-space:pre-wrap}
.opts{display:grid;gap:10px}
.opt{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;border:1.5px solid var(--border);
  border-radius:11px;cursor:pointer;background:var(--white);transition:border-color .15s,background .15s;font-size:15.5px}
.opt:hover{border-color:var(--amber)}
.opt input{margin-top:3px;accent-color:var(--amber);flex-shrink:0}
.opt.sel{border-color:var(--amber);background:rgba(252,163,17,.07)}
.opt .k{font-weight:700;color:var(--muted);flex-shrink:0}
.nav-row{display:flex;justify-content:space-between;gap:12px;margin-top:24px;flex-wrap:wrap}
.dots{display:flex;flex-wrap:wrap;gap:6px;margin-top:22px}
.dots button{width:30px;height:30px;border-radius:7px;border:1.5px solid var(--border);background:var(--white);
  font-size:12px;font-weight:700;color:var(--muted);cursor:pointer;font-family:var(--sans)}
.dots button.done{background:var(--navy);color:#fff;border-color:var(--navy)}
.dots button.here{outline:2.5px solid var(--amber);outline-offset:1px}

/* results */
.score{display:flex;align-items:baseline;gap:14px;margin-bottom:8px}
.score b{font-family:var(--serif);font-size:62px;color:var(--navy);font-weight:400;line-height:1}
.score span{font-size:17px;color:var(--muted)}
.brk{display:grid;gap:12px;margin:22px 0}
.brk .row{display:grid;grid-template-columns:1fr 62px;gap:14px;align-items:center}
.brk .nm{font-size:15px;font-weight:600;color:var(--navy)}
.brk .mtr{height:9px;background:var(--border);border-radius:99px;overflow:hidden;margin-top:6px}
.brk .mtr i{display:block;height:100%;border-radius:99px}
.brk .sc{text-align:right;font-family:ui-monospace,Consolas,monospace;font-size:15px;font-weight:700;font-variant-numeric:tabular-nums}
.rev{border:1px solid var(--border);border-radius:12px;padding:18px 20px;margin-bottom:12px}
.rev.wrong{border-color:#fecaca;background:var(--red-light)}
.rev .t{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);margin-bottom:8px}
.rev .qq{font-weight:600;color:var(--navy);margin-bottom:10px;white-space:pre-wrap}
.rev .ans{font-size:14.5px;margin-bottom:4px}
.rev .ok{color:var(--teal);font-weight:600}
.rev .no{color:var(--red);font-weight:600}
label.f{display:block;font-size:13px;font-weight:700;color:var(--navy);margin-bottom:6px}
input.f,select.f{width:100%;padding:13px 15px;border:1.5px solid var(--border);border-radius:10px;
  font-family:var(--sans);font-size:15px;background:var(--white)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.hide{display:none!important}
footer{background:var(--navy);color:rgba(255,255,255,.6);padding:32px var(--gutter);text-align:center;font-size:13px}
footer a{color:var(--amber);text-decoration:none}
@media(max-width:620px){.grid2{grid-template-columns:1fr}.bar{flex-direction:row}}

/* diagram questions */
.qfig{margin:0 0 20px;display:flex;justify-content:center;background:var(--cream);
  border:1px solid var(--border);border-radius:12px;padding:20px}
.qfig svg{max-width:100%;height:auto}
.opt-fig{align-items:center}
.opt-fig svg{max-width:100%;height:auto}
.opt-fig > span:last-child{display:flex;justify-content:center;flex:1}

/* ---------- setup step ---------- */
.setup{background:linear-gradient(135deg,rgba(252,163,17,.10),rgba(13,148,136,.08));
  border:1.5px solid rgba(252,163,17,.30);border-radius:14px;padding:20px 22px;margin:22px 0}
.setup h4{font-family:var(--sans);font-size:15px;font-weight:800;color:var(--navy);margin-bottom:4px}
.setup p{font-size:13.5px;color:var(--muted);margin-bottom:14px}
.yg{display:flex;gap:9px;flex-wrap:wrap}
.yg button{font-family:var(--sans);font-size:14.5px;font-weight:700;color:var(--navy);
  background:var(--white);border:2px solid var(--border);border-radius:99px;padding:9px 18px;cursor:pointer;
  transition:border-color .15s,background .15s,transform .12s}
.yg button:hover{border-color:var(--amber);transform:translateY(-1px)}
.yg button.on{background:var(--navy);border-color:var(--navy);color:#fff}

/* ---------- hero ---------- */
.wrap>.pill{background:linear-gradient(90deg,var(--amber),#ffb949);color:#4a2c00;border:none;
  box-shadow:0 3px 12px rgba(252,163,17,.35)}
h1 em{font-style:normal;background:linear-gradient(90deg,var(--amber-dk),#d97706);
  -webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- progress + timer ---------- */
.track i{background:linear-gradient(90deg,var(--amber),#ffcf6b)}
.bar{background:linear-gradient(135deg,var(--navy) 0%,#243a6b 100%)}

/* ---------- score ring ---------- */
.ring-wrap{display:flex;align-items:center;gap:26px;flex-wrap:wrap}
.ring{position:relative;width:132px;height:132px;flex-shrink:0}
.ring svg{transform:rotate(-90deg)}
.ring .val{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;
  justify-content:center;font-family:var(--serif);font-size:40px;color:var(--navy);line-height:1}
.ring .val small{font-family:var(--sans);font-size:12px;font-weight:700;color:var(--muted);
  letter-spacing:.6px;text-transform:uppercase;margin-top:2px}

/* ---------- the ask ---------- */
.ask{background:linear-gradient(135deg,var(--navy) 0%,#22345f 100%);color:#fff;border:none}
.ask h2{color:#fff}
.ask p{color:rgba(255,255,255,.78)}
.ask label.f{color:rgba(255,255,255,.9)}
.ask input.f,.ask select.f{background:rgba(255,255,255,.97);border-color:transparent}
.ask .locked{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:700;
  letter-spacing:.5px;text-transform:uppercase;color:var(--amber);margin-bottom:12px}
.ask small{color:rgba(255,255,255,.55)!important}
.ask a{color:var(--amber)!important}
.ask-again{border:1.5px dashed var(--border);background:transparent;text-align:center}

/* ---------- nav marker ---------- */
.nav-links a.nav-free{position:relative;color:#fff;font-weight:700}
.nav-links a.nav-free::after{content:'';position:absolute;top:-2px;right:-11px;width:7px;height:7px;
  border-radius:50%;background:var(--amber);box-shadow:0 0 0 0 rgba(252,163,17,.7);animation:gp-pulse 2.2s infinite}
@keyframes gp-pulse{0%{box-shadow:0 0 0 0 rgba(252,163,17,.65)}70%{box-shadow:0 0 0 9px rgba(252,163,17,0)}100%{box-shadow:0 0 0 0 rgba(252,163,17,0)}}
@media (prefers-reduced-motion:reduce){.nav-links a.nav-free::after{animation:none}}