:root{
  --navy:#0b2e59; --navy-2:#103a6b; --blue:#1351b4; --blue-soft:#e8f0fb;
  --green:#1e8e3e; --green-d:#176c30; --red:#c5221f; --red-d:#a01815;
  --amber:#e8a317; --ink:#15233a; --muted:#5b6b82; --line:#e1e7f0;
  --bg:#f4f6fb; --card:#ffffff; --shadow:0 8px 30px rgba(16,40,80,.10);
  --radius:16px; --mono:"Inter",system-ui,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{
  font-family:"Inter",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  background:var(--bg); color:var(--ink); -webkit-font-smoothing:antialiased;
}
#app{height:100vh;overflow:hidden;position:relative}
.screen{position:absolute;inset:0;opacity:0;visibility:hidden;transition:opacity .25s ease;overflow-y:auto}
.screen.active{opacity:1;visibility:visible}
button{font-family:inherit;cursor:pointer;border:none;background:none}

/* ---------- HOME ---------- */
#screen-home{background:
  radial-gradient(1200px 600px at 50% -10%, #16407c 0%, var(--navy) 45%, #07203f 100%);}
.home-wrap{max-width:920px;margin:0 auto;padding:clamp(28px,5vh,64px) 22px 40px;
  min-height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center}
.home-head{text-align:center;color:#fff}
.emblem{width:54px;height:54px;border-radius:12px;background:#fff;color:var(--navy);
  font-weight:800;font-size:20px;display:grid;place-items:center;margin:0 auto 18px;
  box-shadow:0 6px 18px rgba(0,0,0,.25);letter-spacing:.5px}
.home-head h1{font-size:clamp(30px,5vw,46px);line-height:1.05;margin:0;font-weight:800;letter-spacing:-.02em}
.home-head h1 span{color:#9dc1f5}
.home-sub{color:#bcd0ee;margin:14px 0 0;font-size:16px;font-weight:500}
.home-cards{display:grid;grid-template-columns:1fr 1fr;gap:18px;width:100%;margin:38px 0 26px}
.mode-card{background:var(--card);border-radius:var(--radius);padding:26px 24px;text-align:left;
  box-shadow:var(--shadow);transition:transform .15s ease, box-shadow .15s ease;border:1px solid rgba(255,255,255,.5)}
.mode-card:hover{transform:translateY(-4px);box-shadow:0 16px 40px rgba(8,24,50,.28)}
.mode-ic{width:46px;height:46px;border-radius:12px;background:var(--blue-soft);color:var(--blue);
  display:grid;place-items:center;font-size:20px;margin-bottom:16px}
.mode-card h2{margin:0 0 8px;font-size:22px;color:var(--navy)}
.mode-card p{margin:0 0 18px;color:var(--muted);font-size:14px;line-height:1.5}
.mode-go{display:inline-block;color:var(--blue);font-weight:700;font-size:14px}
.mode-card[data-mode="exam"] .mode-ic{background:#e7f3ea;color:var(--green)}
.home-foot{display:flex;gap:26px;flex-wrap:wrap;justify-content:center;margin-bottom:18px}
.stat{display:flex;flex-direction:column;align-items:center;color:#fff}
.stat b{font-size:26px;font-weight:800}
.stat span{font-size:12px;color:#a9c2e6;text-transform:uppercase;letter-spacing:.04em;margin-top:2px}
.lang-row{display:flex;align-items:center;gap:8px;color:#bcd0ee;font-size:13px;margin-bottom:14px}
.lang-btn{padding:5px 12px;border-radius:8px;background:rgba(255,255,255,.12);color:#dce8fa;font-weight:700;font-size:12px}
.lang-btn.active{background:#fff;color:var(--navy)}
.src-note{color:#86a3cc;font-size:12px;text-align:center;max-width:560px;line-height:1.5}

/* SEO content (poniżej pierwszego ekranu home) */
.seo-block{max-width:760px;margin:10px auto 0;padding:30px 22px 50px;color:#c7d6ee}
.seo-block article h2{color:#fff;font-size:clamp(19px,2.6vw,24px);margin:30px 0 10px;font-weight:700;letter-spacing:-.01em}
.seo-block article h2:first-child{margin-top:0}
.seo-block p{font-size:15px;line-height:1.65;margin:0 0 12px;color:#b9cbe8}
.seo-block strong{color:#e8f0fb}
.seo-block em{color:#9dc1f5;font-style:normal;font-weight:600}
.faq{margin-top:8px}
.faq details{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);
  border-radius:12px;padding:4px 16px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:600;color:#eaf1fc;padding:12px 0;font-size:15px;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";color:#9dc1f5;font-weight:800;margin-right:10px}
.faq details[open] summary::before{content:"–"}
.faq details p{padding:0 0 12px;font-size:14px}
.seo-foot{margin-top:34px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1);text-align:center}
.seo-foot p{font-size:13px;color:#86a3cc;margin:4px 0}
.seo-foot a{color:#9dc1f5;text-decoration:none;font-weight:600}
.seo-foot a:hover{text-decoration:underline}

/* ---------- EXAM ---------- */
#screen-exam{display:flex;flex-direction:column;background:var(--bg)}
.exam-bar{display:flex;align-items:center;justify-content:space-between;
  background:var(--navy);color:#fff;padding:12px 20px;flex:0 0 auto}
.eb-left{display:flex;align-items:center;gap:10px}
.eb-title{font-weight:800;letter-spacing:.04em;font-size:15px}
.eb-cat{background:rgba(255,255,255,.16);padding:3px 9px;border-radius:6px;font-size:12px;font-weight:700}
.phase-pill{font-size:13px;font-weight:700;padding:6px 16px;border-radius:999px;
  background:rgba(255,255,255,.14);transition:background .2s}
.phase-pill.answer{background:var(--amber);color:#332200}
.timer-ring{position:relative;width:44px;height:44px}
.timer-ring svg{transform:rotate(-90deg)}
.tr-bg{fill:none;stroke:rgba(255,255,255,.2);stroke-width:4}
.tr-fg{fill:none;stroke:#fff;stroke-width:4;stroke-linecap:round;
  stroke-dasharray:119.4;stroke-dashoffset:0;transition:stroke-dashoffset 1s linear,stroke .3s}
#timer-num{position:absolute;inset:0;display:grid;place-items:center;font-weight:800;font-size:15px}
.timer-ring.low .tr-fg{stroke:var(--amber)}
.timer-ring.crit .tr-fg{stroke:#ff6b6b}
.exam-progress{height:4px;background:#dde5f1;flex:0 0 auto}
#exam-progress-fill{height:100%;width:0;background:linear-gradient(90deg,var(--blue),#3b82f6);transition:width .4s}
.exam-main{flex:1 1 auto;max-width:780px;width:100%;margin:0 auto;padding:20px 22px 8px;
  display:flex;flex-direction:column}
.exam-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
#q-counter{font-weight:700;color:var(--navy);font-size:14px}
#q-tags{display:flex;gap:6px}
.tag{font-size:11px;font-weight:700;padding:3px 9px;border-radius:6px;background:var(--blue-soft);color:var(--blue)}
.tag.pts{background:#fff3d6;color:#9a6b00}
.media-stage{width:100%;background:#0a1626;border-radius:14px;overflow:hidden;
  display:flex;align-items:center;justify-content:center;min-height:60px;margin-bottom:18px}
.media-stage:empty{display:none}
.media-stage img,.media-stage video{width:100%;max-height:46vh;object-fit:contain;display:block}
.media-missing{color:#9fb3d1;font-size:14px;padding:40px 20px;text-align:center}
.media-missing b{display:block;color:#cdddf2;font-size:15px;margin-bottom:4px}
.question-text{font-size:clamp(18px,2.4vw,23px);font-weight:600;line-height:1.4;
  color:var(--ink);margin:0 0 20px}
.answers{display:flex;flex-direction:column;gap:12px;padding-bottom:16px}
.answers.tn{flex-direction:row}
.ans{display:flex;align-items:center;gap:14px;width:100%;text-align:left;padding:16px 20px;
  border-radius:14px;background:var(--card);border:2px solid var(--line);font-size:16px;font-weight:600;
  color:var(--ink);transition:transform .12s,border-color .15s,background .15s}
.ans:hover:not(:disabled){border-color:var(--blue);transform:translateY(-2px)}
.ans:disabled{cursor:not-allowed;opacity:.55}
.ans .key{flex:0 0 auto;width:34px;height:34px;border-radius:9px;background:var(--blue-soft);
  color:var(--blue);font-weight:800;display:grid;place-items:center;font-size:15px}
.answers.tn .ans{justify-content:center;flex:1;font-size:20px;font-weight:800;padding:22px}
.answers.tn .ans.yes .key{background:#e7f3ea;color:var(--green)}
.answers.tn .ans.no .key{background:#fbe9e8;color:var(--red)}
.answers.tn .ans.yes:hover:not(:disabled){border-color:var(--green);background:#f3faf5}
.answers.tn .ans.no:hover:not(:disabled){border-color:var(--red);background:#fdf4f3}
.ans.correct{border-color:var(--green);background:#eaf6ee}
.ans.correct .key{background:var(--green);color:#fff}
.ans.wrong{border-color:var(--red);background:#fceceb}
.ans.wrong .key{background:var(--red);color:#fff}
.exam-foot{flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;
  max-width:780px;width:100%;margin:0 auto;padding:12px 22px 18px}
.btn-ghost{color:var(--muted);font-weight:600;font-size:14px;padding:8px 14px;border-radius:10px}
.btn-ghost:hover{background:#e9eef6;color:var(--ink)}
.foot-hint{font-size:13px;color:var(--muted)}

/* ---------- RESULT ---------- */
#screen-result{background:var(--bg)}
.result-wrap{max-width:820px;margin:0 auto;padding:34px 22px 60px}
.result-hero{border-radius:var(--radius);padding:34px;color:#fff;text-align:center;margin-bottom:24px;box-shadow:var(--shadow)}
.result-hero.pass{background:linear-gradient(135deg,#1e8e3e,#14672c)}
.result-hero.fail{background:linear-gradient(135deg,#c5221f,#8e1614)}
.result-hero .verdict{font-size:34px;font-weight:800;margin:0}
.result-hero .score{font-size:58px;font-weight:800;margin:8px 0 0;letter-spacing:-.02em}
.result-hero .score small{font-size:24px;opacity:.8;font-weight:700}
.result-hero .sub{margin:6px 0 0;opacity:.92;font-weight:500}
.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:26px}
.rg-card{background:var(--card);border-radius:14px;padding:18px;text-align:center;box-shadow:var(--shadow)}
.rg-card b{display:block;font-size:28px;color:var(--navy);font-weight:800}
.rg-card span{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.result-actions{display:flex;gap:12px;justify-content:center;margin-bottom:30px}
.btn-primary{background:var(--blue);color:#fff;font-weight:700;padding:14px 26px;border-radius:12px;font-size:15px}
.btn-primary:hover{background:#0f47a0}
.btn-second{background:#fff;color:var(--navy);font-weight:700;padding:14px 26px;border-radius:12px;border:1.5px solid var(--line);font-size:15px}
.btn-second:hover{border-color:var(--blue);color:var(--blue)}
.review-h{font-weight:800;color:var(--navy);margin:0 0 14px;font-size:18px}
.review-item{background:var(--card);border-radius:12px;padding:14px 16px;margin-bottom:10px;
  display:flex;gap:14px;align-items:flex-start;box-shadow:0 2px 10px rgba(16,40,80,.05);border-left:5px solid var(--green)}
.review-item.bad{border-left-color:var(--red)}
.ri-ic{flex:0 0 auto;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;
  font-weight:800;color:#fff;font-size:14px;background:var(--green)}
.review-item.bad .ri-ic{background:var(--red)}
.ri-body{flex:1}
.ri-q{font-weight:600;font-size:14px;margin:0 0 6px}
.ri-a{font-size:13px;color:var(--muted)}
.ri-a b{color:var(--ink)}
.ri-thumb{width:70px;height:48px;border-radius:8px;object-fit:cover;flex:0 0 auto;background:#0a1626}

/* ---------- LEARN ---------- */
#screen-learn{background:var(--bg);display:flex;flex-direction:column}
.learn-bar{display:flex;align-items:center;justify-content:space-between;gap:14px;
  background:#fff;padding:14px 20px;border-bottom:1px solid var(--line);flex:0 0 auto}
.learn-bar h2{margin:0;font-size:17px;color:var(--navy)}
.learn-count{font-size:13px;color:var(--muted);font-weight:600}
.learn-controls{background:#fff;padding:0 20px 16px;border-bottom:1px solid var(--line);flex:0 0 auto}
#learn-search{width:100%;padding:12px 16px;border-radius:12px;border:1.5px solid var(--line);
  font-size:15px;margin-bottom:12px;font-family:inherit}
#learn-search:focus{outline:none;border-color:var(--blue)}
.learn-filters{display:flex;gap:10px;flex-wrap:wrap}
.learn-filters select{padding:9px 12px;border-radius:10px;border:1.5px solid var(--line);
  font-size:13px;font-weight:600;color:var(--ink);background:#fff;font-family:inherit}
.learn-list{flex:1 1 auto;overflow-y:auto;max-width:900px;width:100%;margin:0 auto;padding:18px 20px 40px}
.q-card{background:var(--card);border-radius:12px;padding:14px 16px;margin-bottom:10px;
  display:flex;gap:14px;align-items:center;cursor:pointer;box-shadow:0 2px 10px rgba(16,40,80,.05);
  transition:transform .12s,box-shadow .12s;border:1px solid transparent}
.q-card:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:var(--blue-soft)}
.q-card.known{opacity:.6}
.qc-thumb{width:72px;height:52px;border-radius:8px;object-fit:cover;background:#0a1626;flex:0 0 auto}
.qc-thumb.ph{display:grid;place-items:center;color:#7d93b3;font-size:20px}
.qc-body{flex:1;min-width:0}
.qc-q{font-weight:600;font-size:14px;margin:0 0 6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.qc-tags{display:flex;gap:6px;align-items:center}
.qc-known{flex:0 0 auto;color:var(--green);font-weight:800;font-size:18px}
.empty{text-align:center;color:var(--muted);padding:60px 20px;font-size:15px}

/* ---------- MODAL ---------- */
.modal{position:fixed;inset:0;background:rgba(10,22,40,.55);backdrop-filter:blur(3px);
  display:none;align-items:center;justify-content:center;padding:20px;z-index:50}
.modal.open{display:flex}
.modal-card{background:#fff;border-radius:18px;max-width:620px;width:100%;max-height:90vh;
  overflow-y:auto;padding:24px;box-shadow:0 30px 80px rgba(0,0,0,.4)}
.modal-media{width:100%;border-radius:12px;background:#0a1626;margin-bottom:16px;max-height:50vh;object-fit:contain}
.modal-q{font-size:19px;font-weight:700;line-height:1.4;margin:0 0 16px;color:var(--ink)}
.modal-ans{display:flex;flex-direction:column;gap:10px;margin-bottom:18px}
.modal-opt{padding:13px 16px;border-radius:11px;border:2px solid var(--line);font-size:15px;font-weight:600;display:flex;gap:12px}
.modal-opt.ok{border-color:var(--green);background:#eaf6ee}
.modal-opt .key{width:30px;height:30px;border-radius:8px;background:var(--blue-soft);color:var(--blue);font-weight:800;display:grid;place-items:center;flex:0 0 auto}
.modal-opt.ok .key{background:var(--green);color:#fff}
.modal-foot{display:flex;gap:10px;justify-content:space-between;align-items:center}
.modal-tags{display:flex;gap:6px}
.modal-btns{display:flex;gap:10px}
.btn-known{background:var(--green);color:#fff;font-weight:700;padding:10px 18px;border-radius:10px;font-size:14px}
.btn-known.is-known{background:#eaf6ee;color:var(--green-d)}
.btn-close{color:var(--muted);font-weight:700;padding:10px 16px;border-radius:10px}
.btn-close:hover{background:#eef2f8}

@media(max-width:680px){
  .home-cards{grid-template-columns:1fr}
  .result-grid{grid-template-columns:1fr 1fr}
  .eb-title{font-size:13px}
  .answers.tn{flex-direction:column}
}