:root { --bg:#0f172a; --card:#1e293b; --accent:#38bdf8; --text:#e2e8f0; --muted:#94a3b8;
        --line:#334155; --green:#4ade80; --amber:#fbbf24; --rose:#fb7185; --ch:var(--accent); }
* { box-sizing:border-box; }
html { scroll-behavior:smooth; scroll-padding-top:110px; }
body { margin:0; font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
       background:radial-gradient(1000px 500px at 50% -150px, #1d3a5f66, transparent), var(--bg);
       color:var(--text); min-height:100vh; line-height:1.55; }

/* barvy okruhů */
body.t-pravopis { --ch:#4ade80; } body.t-tvaroslovi { --ch:#a78bfa; } body.t-skladba { --ch:#fb7185; }
body.t-zasoba { --ch:#fbbf24; } body.t-sloh { --ch:#38bdf8; } body.t-literatura { --ch:#2dd4bf; }

header { text-align:center; padding:44px 20px 14px; }
.kicker { display:inline-block; font-size:.78rem; letter-spacing:.14em; text-transform:uppercase;
          color:var(--ch); border:1px solid color-mix(in srgb, var(--ch) 40%, transparent);
          border-radius:999px; padding:4px 14px; margin-bottom:14px;
          background:color-mix(in srgb, var(--ch) 8%, transparent); }
header h1 { margin:0; font-size:2.2rem; line-height:1.2;
            background:linear-gradient(90deg, color-mix(in srgb, var(--ch) 60%, #fff), var(--ch) 55%, #818cf8);
            -webkit-background-clip:text; background-clip:text; color:transparent; }
header .sub { color:var(--muted); margin:10px 0 0; }
.back { display:inline-block; margin-top:12px; color:var(--ch); text-decoration:none; font-size:.9rem; }
.back:hover { text-decoration:underline; }
.back + .back { margin-left:18px; }

main { max-width:1000px; margin:0 auto; padding:20px 16px 70px; }

/* horní lišta s navigací a hledáním */
.toolbar { position:sticky; top:0; z-index:50; background:rgba(15,23,42,.92);
           backdrop-filter:blur(6px); border-bottom:1px solid var(--line); padding:10px 16px; }
.toolbar-inner { max-width:1000px; margin:0 auto; display:flex; flex-direction:column; gap:8px; }
.searchrow { display:flex; gap:10px; }
#search { flex:1; background:var(--card); border:1px solid #475569; border-radius:10px;
          color:var(--text); padding:9px 14px; font-size:1rem; outline:none; }
#search:focus { border-color:var(--ch); }
.btn { background:var(--card); border:1px solid #475569; border-radius:10px; color:var(--muted);
       padding:9px 14px; font-size:.9rem; cursor:pointer; white-space:nowrap; }
.btn:hover { border-color:var(--ch); color:var(--text); }
nav.parts { display:flex; flex-wrap:wrap; gap:6px; }
nav.parts a { color:var(--muted); text-decoration:none; font-size:.85rem; border:1px solid var(--line);
              border-radius:999px; padding:4px 12px; transition:color .12s, border-color .12s; }
nav.parts a:hover { color:var(--ch); border-color:var(--ch); }

/* sekce a karty */
section.part { margin-top:38px; }
section.part > h2 { font-size:1.35rem; color:var(--ch); margin:0 0 6px; padding:6px 0 6px 14px;
                    border-left:4px solid var(--ch);
                    background:linear-gradient(90deg, color-mix(in srgb, var(--ch) 10%, transparent), transparent 60%);
                    border-radius:4px; }
section.part > .lead { color:var(--muted); margin:0 0 16px; font-size:.95rem; padding-left:18px; }
h3.group { font-size:1.05rem; margin:26px 0 10px; color:var(--text); display:flex; align-items:center; gap:10px; }
h3.group::after { content:""; flex:1; height:1px; background:linear-gradient(90deg, var(--line), transparent); }
h3.group small { color:var(--muted); font-weight:400; }

.items { display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:12px; }
details.item { background:var(--card); border:1px solid var(--line); border-radius:12px; overflow:hidden;
               transition:border-color .15s; }
details.item:hover { border-color:color-mix(in srgb, var(--ch) 60%, var(--line)); }
details.item[open] { grid-column:1 / -1; border-color:color-mix(in srgb, var(--ch) 55%, var(--line));
                     box-shadow:0 6px 24px #0006; }
details.item summary { list-style:none; cursor:pointer; padding:12px 38px 12px 14px; display:flex;
                       flex-direction:column; gap:2px; position:relative; }
details.item summary::after { content:"▾"; position:absolute; right:14px; top:12px; color:var(--muted);
                              transition:transform .15s; }
details.item[open] summary::after { transform:rotate(180deg); color:var(--ch); }
details.item summary::-webkit-details-marker { display:none; }
details.item summary b { color:var(--ch); font-size:.98rem; letter-spacing:.02em; }
details.item summary .hint { color:var(--muted); font-size:.85rem; }
details.item .body { padding:0 14px 13px; font-size:.92rem; }
details.item .body p { margin:6px 0; }
.ex { color:var(--green); font-size:.88rem; }
.ex::before { content:"Př.: "; color:var(--muted); }
.warn { color:var(--amber); font-size:.88rem; }
.tip { background:#0f172a; border:1px dashed #475569; border-radius:10px; padding:8px 12px;
       font-size:.88rem; color:var(--muted); margin:8px 0; }
.tip b { color:var(--amber); }

table { width:100%; border-collapse:collapse; font-size:.9rem; margin:10px 0; }
th, td { border:1px solid var(--line); padding:7px 10px; text-align:left; vertical-align:top; }
th { background:color-mix(in srgb, var(--ch) 12%, var(--card)); color:var(--ch); font-weight:600; }
td b { color:var(--text); }
table tr:nth-child(even) td { background:#0b1322aa; }
.tablewrap { overflow-x:auto; }

.practice { display:inline-block; margin:14px 0 0; color:#082032; font-weight:700; text-decoration:none;
            background:linear-gradient(90deg, color-mix(in srgb, var(--ch) 80%, #fff), var(--ch));
            border-radius:10px; padding:10px 18px; font-size:.95rem; }
.practice:hover { filter:brightness(1.1); }
.practice.ghost { background:transparent; color:var(--ch); border:1px solid var(--ch); font-weight:600; }

.cols2 { display:grid; grid-template-columns:1fr 1fr; gap:10px; }
@media (max-width:700px){ .cols2 { grid-template-columns:1fr; } }
.box { background:var(--card); border:1px solid var(--line); border-top:3px solid var(--ch);
       border-radius:12px; padding:14px 16px; font-size:.92rem; }
.box h4 { margin:0 0 8px; color:var(--ch); font-size:1rem; }
.box ul { margin:6px 0; padding-left:20px; }
.box li { margin:3px 0; }

.hidden { display:none !important; }
mark { background:#fbbf2433; color:inherit; border-radius:3px; }
#noresults { display:none; text-align:center; color:var(--muted); padding:40px 0; }
footer { text-align:center; color:#475569; padding:24px; font-size:.85rem; }
footer a { color:var(--muted); }
.totop { position:fixed; right:18px; bottom:18px; background:var(--card); border:1px solid #475569;
         color:var(--ch); border-radius:50%; width:44px; height:44px; font-size:1.2rem;
         cursor:pointer; display:none; }

/* ===== rozcestník okruhů ===== */
.topics { display:grid; grid-template-columns:repeat(auto-fill,minmax(280px,1fr)); gap:18px; }
.topic { --ch:var(--accent); background:var(--card); border:1px solid var(--line); border-top:4px solid var(--ch);
         border-radius:14px; padding:20px; display:flex; flex-direction:column;
         transition:transform .12s, border-color .12s; }
.topic:hover { transform:translateY(-3px); border-color:var(--ch); }
.topic h2 { margin:0 0 6px; font-size:1.2rem; color:var(--ch); display:flex; align-items:center; gap:10px; }
.topic h2 .ico { font-size:1.4rem; }
.topic p { margin:0; color:var(--muted); flex:1; font-size:.93rem; }
.topic .actions { display:flex; gap:8px; margin-top:16px; }
.topic .actions a { flex:1; text-align:center; text-decoration:none; font-weight:600; font-size:.92rem;
                    border-radius:9px; padding:9px 0; }
.topic .actions .theory { color:var(--ch); border:1px solid var(--ch); }
.topic .actions .theory:hover { background:color-mix(in srgb, var(--ch) 12%, transparent); }
.topic .actions .quiz { color:#082032; background:var(--ch); }
.topic .actions .quiz:hover { filter:brightness(1.1); }

/* ===== kvíz ===== */
.panel { background:var(--card); border:1px solid var(--line); border-radius:16px; padding:22px; }
.panel h2 { margin:0 0 14px; font-size:1.2rem; color:var(--ch); }
.chips { display:flex; flex-wrap:wrap; gap:8px; }
.chip { border:1px solid var(--line); background:transparent; color:var(--text); border-radius:999px;
        padding:8px 16px; font-size:.92rem; cursor:pointer; transition:all .12s; }
.chip:hover { border-color:var(--ch); }
.chip.sel { background:color-mix(in srgb, var(--ch) 14%, transparent); border-color:var(--ch);
            color:var(--ch); font-weight:600; }
.countrow { display:flex; gap:8px; margin-top:16px; align-items:center; flex-wrap:wrap; }
.countrow span { color:var(--muted); font-size:.92rem; }
.subrow { margin-top:16px; }
.subrow .lbl { display:block; color:var(--muted); font-size:.92rem; margin-bottom:8px; }
.startbtn { display:block; width:100%; margin-top:20px; background:linear-gradient(90deg,#0ea5e9,#38bdf8);
            color:#082032; font-weight:700; font-size:1.05rem; border:0; border-radius:12px;
            padding:14px; cursor:pointer; }
.startbtn:hover { filter:brightness(1.1); }
.progress { height:8px; background:var(--card); border-radius:999px; overflow:hidden; margin-bottom:16px;
            border:1px solid var(--line); }
.progress i { display:block; height:100%; background:linear-gradient(90deg,#0ea5e9,#38bdf8); width:0;
              transition:width .25s; }
.qmeta { display:flex; justify-content:space-between; color:var(--muted); font-size:.88rem; margin-bottom:10px; }
.qmeta .topic { color:var(--ch); }
.question { font-size:1.15rem; font-weight:600; margin:0 0 18px; }
.question .cite { display:block; margin-top:8px; padding:10px 14px; background:#0f172a;
                  border-left:3px solid var(--ch); border-radius:6px; font-weight:400; font-style:italic; font-size:1rem; }
.answers { display:grid; gap:10px; }
.ans { text-align:left; background:#0f172a; border:1px solid var(--line); color:var(--text);
       border-radius:12px; padding:13px 16px; font-size:1rem; cursor:pointer; transition:border-color .12s; }
.ans:hover:not(:disabled) { border-color:var(--ch); }
.ans:disabled { cursor:default; }
.ans.correct { border-color:var(--green); background:#4ade8018; color:var(--green); font-weight:600; }
.ans.wrong { border-color:var(--rose); background:#fb718518; color:var(--rose); }
.explain { margin-top:14px; padding:12px 16px; border-radius:10px; background:#0f172a;
           border:1px dashed var(--line); font-size:.95rem; color:var(--muted); display:none; }
.explain b { color:var(--text); }
.nextbtn { margin-top:16px; width:100%; background:var(--card); border:1px solid var(--ch);
           color:var(--ch); font-weight:700; border-radius:12px; padding:12px; font-size:1rem;
           cursor:pointer; display:none; }
.nextbtn:hover { background:color-mix(in srgb, var(--ch) 10%, transparent); }
.score { text-align:center; }
.score .big { font-size:3.4rem; font-weight:800; margin:6px 0;
              background:linear-gradient(90deg,#7dd3fc,#818cf8); -webkit-background-clip:text;
              background-clip:text; color:transparent; }
.score .msg { color:var(--muted); margin-bottom:20px; }
.review { text-align:left; margin-top:20px; display:grid; gap:10px; }
.review .r { border:1px solid var(--line); border-radius:10px; padding:10px 14px; font-size:.92rem; }
.review .r.ok { border-left:3px solid var(--green); }
.review .r.ko { border-left:3px solid var(--rose); }
.review .r .q { font-weight:600; }
.review .r .a { color:var(--muted); }
.review .r .a b { color:var(--green); }