/* ============================================================
   THEME — palete reglate manual pentru contrast & confort
   ============================================================ */
:root{
  /* surfaces (neutre, ușor calde — nu albastru) */
  --bg:#f3f4f7; --bg2:#fbfbfd; --card:#ffffff; --elev:#ffffff;
  --text:#181b22; --muted:#646c7c; --faint:#8a93a3;
  --border:#e7e9ef; --border2:#dfe2ea; --chip:#eef0f5;
  /* accent — indigo/violet temperat */
  --accent:#5b54e6; --accent2:#7b74f2; --accent-ink:#4a43d6;
  --accent-soft:#ecebfc; --accent-line:#d9d7f8;
  /* semantic */
  --ok:#179a5b; --ok-soft:#e4f6ec; --ok-line:#bfe8cf;
  --bad:#d23b46; --bad-soft:#fbe9eb; --bad-line:#f3c9cd;
  --warn:#c9700a; --warn-soft:#fdf0dd;
  /* code */
  --code-bg:#1d2230; --code-text:#e8ebf3; --code-line:rgba(255,255,255,.07);
  --shadow:0 4px 14px rgba(28,38,68,.07), 0 1px 3px rgba(28,38,68,.06);
  --shadow-lg:0 14px 40px rgba(28,38,68,.12);
}
[data-theme="dark"]{
  --bg:#101218; --bg2:#161922; --card:#1a1e28; --elev:#1f2430;
  --text:#e9ebf1; --muted:#9aa2b2; --faint:#727b8d;
  --border:#272c38; --border2:#2f3543; --chip:#242a36;
  --accent:#897fff; --accent2:#a59dff; --accent-ink:#9a90ff;
  --accent-soft:#262340; --accent-line:#3a3563;
  --ok:#46d68a; --ok-soft:#15301f; --ok-line:#1f5236;
  --bad:#ff7b85; --bad-soft:#341d20; --bad-line:#5a2d33;
  --warn:#f3b04a; --warn-soft:#332615;
  --code-bg:#0c0e15; --code-text:#dfe4ef; --code-line:rgba(255,255,255,.06);
  --shadow:0 6px 22px rgba(0,0,0,.34); --shadow-lg:0 16px 44px rgba(0,0,0,.5);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth; -webkit-text-size-adjust:100%}
body{
  margin:0; font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg); color:var(--text); line-height:1.55;
  transition:background .25s ease,color .25s ease; -webkit-font-smoothing:antialiased;
}
code,pre,.mono{font-family:"SF Mono",ui-monospace,"Cascadia Code",Consolas,Menlo,monospace}

/* ============================================================
   HEADER (desktop top bar)
   ============================================================ */
header{
  position:sticky; top:0; z-index:50; background:var(--bg2);
  background:color-mix(in srgb,var(--bg2) 90%, transparent);
  border-bottom:1px solid var(--border); backdrop-filter:saturate(1.6) blur(12px);
}
.bar{max-width:1040px; margin:0 auto; padding:13px 22px; display:flex; align-items:center; gap:18px; min-height:64px}

/* brand */
.brand{display:flex; align-items:center; gap:11px; cursor:pointer; user-select:none}
.brand-badge{
  width:40px; height:40px; flex:none; border-radius:12px; display:grid; place-items:center; font-size:22px;
  background:linear-gradient(135deg,var(--accent) 0%, var(--accent2) 100%);
  box-shadow:0 5px 14px rgba(91,84,230,.4);
}
.brand-text{font-weight:800; font-size:19px; letter-spacing:-.4px; color:var(--text); line-height:1}
.brand-text b{color:var(--accent-ink)}

/* nav — segmented control */
nav{display:flex; gap:3px; margin-left:auto; background:var(--chip); padding:5px; border-radius:14px}
nav button{
  display:flex; align-items:center; gap:7px; background:transparent; border:none; color:var(--muted);
  font-weight:650; padding:9px 16px; border-radius:10px; cursor:pointer; font-size:14.5px;
  transition:background .15s,color .15s,box-shadow .15s; font-family:inherit; white-space:nowrap;
}
nav button .ni{display:none; font-size:18px; line-height:1}
nav button:hover{color:var(--text)}
nav button.active{color:var(--accent-ink); background:var(--card); box-shadow:0 2px 6px rgba(28,38,68,.1)}

.theme-btn{
  flex:none; border:1px solid var(--border2); background:var(--card); width:44px; height:44px; border-radius:12px;
  cursor:pointer; font-size:19px; display:grid; place-items:center; transition:border-color .15s,transform .1s;
}
.theme-btn:hover{border-color:var(--accent)}
.theme-btn:active{transform:scale(.94)}

/* ============================================================
   LAYOUT
   ============================================================ */
main{max-width:1000px; margin:0 auto; padding:26px 18px 90px}
.view{display:none; animation:fade .28s ease}
.view.active{display:block}
@keyframes fade{from{opacity:0; transform:translateY(6px)}to{opacity:1; transform:none}}
h1{font-size:29px; letter-spacing:-.7px; margin:.2em 0 .35em; line-height:1.2}
h2{font-size:20px; letter-spacing:-.3px; margin:1.5em 0 .65em}
.sub{color:var(--muted); font-size:15px; max-width:64ch}

/* ============================================================
   HOME
   ============================================================ */
.hero{
  position:relative; overflow:hidden; color:#fff; border-radius:20px; padding:32px 30px;
  background:linear-gradient(135deg,var(--accent) 0%, var(--accent2) 100%);
  box-shadow:var(--shadow-lg); margin-bottom:24px;
}
.hero::after{
  content:""; position:absolute; right:-60px; top:-60px; width:240px; height:240px; border-radius:50%;
  background:rgba(255,255,255,.12);
}
.hero h1{color:#fff; margin-top:0; position:relative}
.hero p{color:rgba(255,255,255,.94); max-width:60ch; margin:.2em 0 0; position:relative}
.hero .row{position:relative}
.grid{display:grid; gap:14px; grid-template-columns:repeat(auto-fill,minmax(215px,1fr))}
.card{
  background:var(--card); border:1px solid var(--border); border-radius:15px; padding:18px;
  box-shadow:var(--shadow); transition:transform .16s ease,border-color .16s,box-shadow .16s;
  cursor:pointer; text-align:left; font-family:inherit; color:inherit; font-size:inherit;
}
.card:hover{transform:translateY(-3px); border-color:var(--accent-line); box-shadow:var(--shadow-lg)}
.card:active{transform:translateY(-1px)}
.card .ic{font-size:26px}
.card h3{margin:.55em 0 .25em; font-size:16.5px; letter-spacing:-.2px}
.card p{margin:0; color:var(--muted); font-size:13.5px}
.card .stat{margin-top:11px; font-size:12.5px; color:var(--accent-ink); font-weight:700}
.btn{
  display:inline-flex; align-items:center; gap:8px; background:var(--accent); color:#fff; border:none;
  padding:11px 18px; border-radius:12px; font-weight:700; cursor:pointer; font-size:15px;
  transition:filter .15s,transform .1s; font-family:inherit;
}
.btn:hover{filter:brightness(1.07); transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn.ghost{background:var(--chip); color:var(--text)}
.btn.ghost:hover{background:var(--border)}
.btn.sm{padding:8px 13px; font-size:13.5px; border-radius:10px}
.row{display:flex; gap:10px; flex-wrap:wrap; align-items:center}

/* ============================================================
   QUIZ
   ============================================================ */
.qmeta{display:flex; justify-content:space-between; align-items:center; margin-bottom:14px; flex-wrap:wrap; gap:10px}
.progress{height:8px; background:var(--chip); border-radius:99px; overflow:hidden; margin:6px 0 20px}
.progress>i{display:block; height:100%; background:linear-gradient(90deg,var(--accent),var(--accent2)); width:0; transition:width .35s ease}
.pill{font-size:12.5px; font-weight:700; padding:5px 11px; border-radius:99px; background:var(--accent-soft); color:var(--accent-ink)}
.pill.warn{background:var(--warn-soft); color:var(--warn)}
.qcard{background:var(--card); border:1px solid var(--border); border-radius:18px; padding:22px; box-shadow:var(--shadow)}
.qtext{font-size:18px; font-weight:650; margin-bottom:4px; letter-spacing:-.2px}
.qhint{font-size:13px; color:var(--muted); margin-bottom:14px}
pre.code{
  background:var(--code-bg); color:var(--code-text); padding:14px 16px; border-radius:12px; overflow-x:auto;
  font-size:13.5px; line-height:1.5; margin:12px 0; border:1px solid var(--code-line);
  -webkit-overflow-scrolling:touch;
}
.answers{display:flex; flex-direction:column; gap:10px; margin-top:6px}
.ans{
  display:flex; gap:12px; align-items:flex-start; padding:13px 15px; border:1.5px solid var(--border2);
  border-radius:13px; cursor:pointer; transition:border-color .13s,background .13s; background:var(--bg2); user-select:none;
}
.ans:hover{border-color:var(--accent2)}
.ans .box{
  flex:none; width:22px; height:22px; border:2px solid var(--faint); border-radius:7px; margin-top:1px;
  display:grid; place-items:center; font-size:14px; color:#fff; transition:.13s;
}
.ans.sel{border-color:var(--accent); background:var(--accent-soft)}
.ans.sel .box{background:var(--accent); border-color:var(--accent)}
.ans .t{flex:1; min-width:0}
.ans .t code{background:var(--chip); padding:1px 6px; border-radius:6px; font-size:.9em; word-break:break-word}
.ans.correct{border-color:var(--ok-line); background:var(--ok-soft)}
.ans.correct .box{background:var(--ok); border-color:var(--ok)}
.ans.wrong{border-color:var(--bad-line); background:var(--bad-soft)}
.ans.wrong .box{background:var(--bad); border-color:var(--bad)}
.ans.missed{border-color:var(--ok); border-style:dashed}
.locked{pointer-events:none}
.explain{
  margin-top:16px; padding:14px 16px; border-radius:13px; border-left:4px solid var(--accent);
  background:var(--accent-soft); font-size:14.5px;
}
.explain.good{border-color:var(--ok); background:var(--ok-soft)}
.explain.bad{border-color:var(--bad); background:var(--bad-soft)}
.explain b{display:block; margin-bottom:3px}
.explain code{background:rgba(125,125,125,.18); padding:1px 6px; border-radius:6px; font-size:.9em; word-break:break-word}
.qfoot{display:flex; justify-content:space-between; gap:10px; margin-top:18px; flex-wrap:wrap}

/* ============================================================
   RESULT
   ============================================================ */
.result{text-align:center; background:var(--card); border:1px solid var(--border); border-radius:20px; padding:34px 22px; box-shadow:var(--shadow-lg)}
.score-ring{
  width:150px; height:150px; border-radius:50%; margin:8px auto 18px; display:grid; place-items:center;
  font-size:34px; font-weight:800; border:6px solid currentColor;
}
.score-ring small{display:block; font-size:13px; font-weight:600; color:var(--muted)}

/* ============================================================
   EXAMS
   ============================================================ */
.exam-item{background:var(--card); border:1px solid var(--border); border-radius:15px; padding:18px 20px; margin-bottom:14px; box-shadow:var(--shadow)}
.exam-item .qh{display:flex; gap:12px; align-items:baseline; flex-wrap:wrap}
.exam-item .num{font-weight:800; color:var(--accent-ink); font-size:18px; flex:none}
.exam-item .qq{font-weight:650; font-size:16px; flex:1; min-width:60%}
.pts{margin-left:auto; font-size:12px; color:var(--muted); font-weight:700; white-space:nowrap}
.exam-item .qq code,.qq code{background:var(--chip); padding:1px 6px; border-radius:6px; font-size:.9em}
.barem{margin-top:12px; border-top:1px dashed var(--border2); padding-top:12px; display:none}
.barem.open{display:block}
.barem h4{margin:.2em 0 .6em; color:var(--ok); font-size:13px; text-transform:uppercase; letter-spacing:.5px; font-weight:700}
.barem pre{background:var(--code-bg); color:var(--code-text); padding:12px 14px; border-radius:11px; overflow-x:auto; font-size:13px; border:1px solid var(--code-line); -webkit-overflow-scrolling:touch}
.barem code{background:var(--chip); padding:1px 6px; border-radius:6px; font-size:.9em; word-break:break-word}
.barem>div{margin:2px 0}
.toggle-b{margin-top:12px}
.exam-tabs{display:flex; gap:8px; flex-wrap:wrap; margin-bottom:18px}
.exam-tabs button{padding:9px 15px; border-radius:11px; border:1px solid var(--border2); background:var(--card); color:var(--text); font-weight:650; cursor:pointer; transition:.15s; font-family:inherit; font-size:14px}
.exam-tabs button:hover{border-color:var(--accent)}
.exam-tabs button.active{background:var(--accent); color:#fff; border-color:var(--accent)}

/* ============================================================
   STATS
   ============================================================ */
.stat-grid{display:grid; gap:14px; grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}
.stat-card{background:var(--card); border:1px solid var(--border); border-radius:15px; padding:18px; box-shadow:var(--shadow)}
.stat-card .big{font-size:30px; font-weight:800; color:var(--accent-ink); letter-spacing:-1px}
.stat-card .lbl{color:var(--muted); font-size:13px; font-weight:600}
.bar-row{margin:13px 0}
.bar-row .top{display:flex; justify-content:space-between; font-size:13.5px; margin-bottom:5px; font-weight:600; gap:10px}
.bar{height:10px; background:var(--chip); border-radius:99px; overflow:hidden}
.bar>i{display:block; height:100%; border-radius:99px; transition:width .5s ease}
.muted{color:var(--muted)}
.empty{text-align:center; padding:44px 20px; color:var(--muted)}
footer{text-align:center; padding:24px 18px; color:var(--muted); font-size:13px}
a{color:var(--accent-ink)}
::selection{background:var(--accent-soft)}

/* ============================================================
   RESPONSIVE — tablete
   ============================================================ */
@media (max-width:760px){
  h1{font-size:25px}
  .hero{padding:26px 22px; border-radius:18px}
  main{padding:22px 15px 96px}
}

/* ============================================================
   RESPONSIVE — mobil: nav devine BOTTOM TAB BAR
   ============================================================ */
@media (max-width:600px){
  .bar{padding:12px 16px; justify-content:space-between; min-height:60px}
  .brand-badge{width:36px; height:36px; font-size:20px; border-radius:11px}
  .brand-text{font-size:18px}

  /* topbar: doar brand + theme; nav se mută jos ca tab bar */
  nav{
    position:fixed; left:0; right:0; bottom:0; z-index:60; margin:0;
    background:var(--bg2);
    background:color-mix(in srgb,var(--bg2) 97%, transparent);
    border-top:1px solid var(--border); border-radius:0; gap:0; padding:7px 6px;
    padding-bottom:calc(7px + env(safe-area-inset-bottom));
    backdrop-filter:saturate(1.5) blur(14px);
    box-shadow:0 -3px 18px rgba(0,0,0,.08);
  }
  nav button{
    flex:1; flex-direction:column; gap:3px; padding:6px 2px; border-radius:12px;
    font-size:11px; font-weight:650; box-shadow:none;
  }
  nav button .ni{display:block}
  nav button.active{background:transparent; color:var(--accent-ink); box-shadow:none}
  nav button:hover{background:transparent}

  main{padding:18px 14px 96px}
  h1{font-size:23px}
  .hero{padding:24px 20px}
  .hero h1{font-size:24px}
  .sub{font-size:14px}

  .grid{grid-template-columns:1fr 1fr; gap:11px}
  .card{padding:15px; border-radius:14px}
  .card .ic{font-size:23px}
  .card h3{font-size:15px}
  .card p{font-size:12.5px}

  .qcard{padding:17px; border-radius:16px}
  .qtext{font-size:16.5px}
  .ans{padding:12px 13px}
  .btn{padding:11px 16px; font-size:14.5px}
  .qfoot .btn{flex:1; justify-content:center}

  .stat-grid{grid-template-columns:1fr 1fr 1fr; gap:9px}
  .stat-card{padding:13px}
  .stat-card .big{font-size:23px}
  .stat-card .lbl{font-size:11.5px}

  .result{padding:28px 18px}
  footer{padding-bottom:90px}
}

/* telefoane mici de tot */
@media (max-width:380px){
  .grid{grid-template-columns:1fr}
  nav button{font-size:10px}
}