/* CDL HazMat Practice — shared styles. Zero dependencies, system fonts. */
:root{
  --navy:#0e2a47;
  --navy-2:#123a61;
  --ink:#1b2733;
  --muted:#5a6a79;
  --bg:#f4f6f8;
  --card:#ffffff;
  --line:#d9e0e7;
  --amber:#e8a33d;
  --amber-dark:#b97a14;
  --ok:#146c43;
  --ok-bg:#e6f4ec;
  --bad:#b3261e;
  --bad-bg:#fbeae9;
  --info-bg:#eef3f8;
  --radius:12px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  font-size:17px;line-height:1.55;
}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
a{color:var(--navy-2)}
h1{font-size:2rem;line-height:1.2;margin:.4em 0 .3em}
h2{font-size:1.45rem;line-height:1.25;margin:1.2em 0 .5em}
h3{font-size:1.12rem;margin:1em 0 .4em}
p{margin:.55em 0}
.small{font-size:.88rem;color:var(--muted)}
.lede{font-size:1.13rem;color:#33475c}

/* Header / footer */
.site-header{background:var(--navy);color:#fff}
.site-header .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:8px 20px;padding-top:12px;padding-bottom:12px}
.brand{color:#fff;text-decoration:none;font-weight:800;font-size:1.15rem;letter-spacing:.2px}
.brand span{color:var(--amber)}
.main-nav{display:flex;flex-wrap:wrap;gap:4px 16px;margin-left:auto}
.main-nav a{color:#dbe6f2;text-decoration:none;font-size:.95rem;padding:4px 2px}
.main-nav a:hover{color:#fff;text-decoration:underline}
.site-footer{background:#0b1f36;color:#b9c9da;margin-top:56px;padding:28px 0 36px;font-size:.9rem}
.site-footer a{color:#dbe6f2}
.site-footer .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px}

/* Hero & cards */
.hero{background:linear-gradient(180deg,var(--navy) 0%,var(--navy-2) 100%);color:#fff;padding:34px 0 40px}
.hero h1{color:#fff}
.hero .lede{color:#d7e4f2}
.hero .cta-row{margin-top:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin:16px 0}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:16px 0}
.grid .card{margin:0}
.price-big{font-size:2rem;font-weight:800;color:var(--navy)}
.tag{display:inline-block;background:var(--info-bg);color:var(--navy-2);border:1px solid var(--line);
  border-radius:999px;padding:1px 10px;font-size:.78rem;font-weight:600;margin-bottom:8px}
.check-list{list-style:none;padding-left:0}
.check-list li{padding-left:26px;position:relative;margin:.35em 0}
.check-list li::before{content:"✓";position:absolute;left:2px;color:var(--ok);font-weight:700}

/* Buttons */
.btn{display:inline-block;background:var(--navy);color:#fff;text-decoration:none;border:none;cursor:pointer;
  font-size:1rem;font-weight:700;padding:12px 22px;border-radius:9px;line-height:1.2}
.btn:hover{background:var(--navy-2)}
.btn-accent{background:var(--amber);color:#231500}
.btn-accent:hover{background:#f0b354}
.btn-ghost{background:#fff;color:var(--navy);border:1.5px solid var(--navy)}
.btn-ghost:hover{background:var(--info-bg)}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}

/* Quiz engine */
.quiz-progress{margin:18px 0 6px}
.quiz-progress .bar{background:#dde5ec;border-radius:99px;height:10px;overflow:hidden}
.quiz-progress .bar span{display:block;height:100%;background:var(--amber);width:0;transition:width .25s}
.quiz-count{font-size:.9rem;color:var(--muted);margin-top:6px}
.quiz-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin:10px 0}
.quiz-q{font-size:1.14rem;font-weight:650;margin:2px 0 14px}
.opts{display:grid;gap:10px}
.opt-btn{display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;
  background:#fff;border:1.5px solid var(--line);border-radius:10px;padding:13px 15px;
  font-size:1rem;color:var(--ink);cursor:pointer;line-height:1.45}
.opt-btn .letter{flex:0 0 auto;font-weight:800;color:var(--navy-2);background:var(--info-bg);
  border-radius:6px;padding:0 8px;line-height:1.7}
.opt-btn:hover{border-color:var(--navy-2)}
.opt-btn.selected{border-color:var(--navy);background:var(--info-bg)}
.opt-btn.correct{border-color:var(--ok);background:var(--ok-bg)}
.opt-btn.correct .letter{background:var(--ok);color:#fff}
.opt-btn.wrong{border-color:var(--bad);background:var(--bad-bg)}
.opt-btn.wrong .letter{background:var(--bad);color:#fff}
.opt-btn[disabled]{cursor:default;opacity:.92}
.explain{margin-top:16px;border-left:4px solid var(--amber);background:#fffaf0;padding:12px 16px;border-radius:0 8px 8px 0}
.explain .verdict{font-weight:800;margin-bottom:4px}
.explain .verdict.ok{color:var(--ok)}
.explain .verdict.bad{color:var(--bad)}
.explain .source{font-size:.86rem;color:var(--muted);margin-top:6px}
.quiz-nav{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;margin:14px 0 8px}
.results{text-align:left}
.score-big{font-size:2.4rem;font-weight:800;color:var(--navy);line-height:1.1}
.pass-banner{border-radius:10px;padding:14px 18px;font-weight:700;margin:12px 0}
.pass-banner.ok{background:var(--ok-bg);color:var(--ok);border:1px solid var(--ok)}
.pass-banner.bad{background:var(--bad-bg);color:var(--bad);border:1px solid var(--bad)}
.review-item{border:1px solid var(--line);border-radius:10px;padding:16px 18px;margin:12px 0;background:#fff}
.review-item .rq{font-weight:650}
.review-item .your{color:var(--bad)}
.review-item .right{color:var(--ok);font-weight:650}
.loading,.error{padding:22px;text-align:center;color:var(--muted)}

/* Practice bank */
.filter-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:14px 0}
.filter-row select{font-size:1rem;padding:9px 12px;border:1.5px solid var(--line);border-radius:8px;background:#fff}
.practice-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;margin:12px 0}
.practice-card .quiz-q{font-size:1.05rem}
.gate{background:#fff7e6;border:1.5px dashed var(--amber-dark);border-radius:var(--radius);padding:22px;margin:18px 0}
.unlock-form{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}
.unlock-form input{flex:1 1 240px;font-size:1rem;padding:12px 14px;border:1.5px solid var(--line);border-radius:9px}
.unlock-msg{font-weight:700;margin-top:8px}
.unlock-msg.ok{color:var(--ok)}
.unlock-msg.bad{color:var(--bad)}
.notebook-empty{color:var(--muted)}
details.faq{background:#fff;border:1px solid var(--line);border-radius:10px;padding:6px 18px;margin:10px 0}
details.faq summary{font-weight:700;cursor:pointer;padding:10px 0}
.state-cards .card h3{margin-top:0}
@media (max-width:640px){
  body{font-size:16px}
  h1{font-size:1.6rem}
  .hero{padding:24px 0 28px}
  .site-header .wrap{gap:6px 12px}
  .main-nav{margin-left:0}
  .btn{padding:12px 16px}
}