:root{
  --bg:#f7f5f0; --fg:#1a1a1a; --muted:#6a6a6a; --line:#ddd7cc;
  --card:#fff; --accent:#1b2a4a; --accent2:#a3762e; --ok:#1d7a4a; --warn:#b3541e;
  --r:12px;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#14161a; --fg:#eceae5; --muted:#9a978f; --line:#2c3038;
         --card:#1c1f25; --accent:#8fb0e8; --accent2:#d8a94e; }
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);
  font:17px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;}
a{color:var(--accent);text-decoration:none}
main{max-width:940px;margin:0 auto;padding:18px 16px 64px}
.topbar{position:sticky;top:0;z-index:9;display:flex;gap:14px;align-items:center;
  flex-wrap:wrap;background:var(--accent);color:#fff;
  padding:calc(env(safe-area-inset-top) + 10px) 16px 10px}
.topbar a{color:#fff;opacity:.9;font-size:15px}
.topbar .brand{font-weight:700;font-size:18px;opacity:1;margin-right:auto}
.topbar nav{display:flex;gap:14px;flex-wrap:wrap}
.badge{background:var(--accent2);color:#111;border-radius:9px;padding:0 7px;font-size:12px}
h1{font-size:26px;margin:.2em 0 .6em} h2{font-size:20px;margin:1.2em 0 .4em}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:16px;margin:0 0 14px}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.grow{flex:1 1 220px}
.muted{color:var(--muted);font-size:14px}
.btn{display:inline-block;background:var(--accent);color:#fff;border:0;
  border-radius:var(--r);padding:12px 20px;font-size:17px;cursor:pointer}
.btn.big{font-size:22px;padding:20px 28px;width:100%;text-align:center}
.btn.rec{background:#b02020;font-size:26px;padding:26px;border-radius:999px}
.btn.rec.on{background:#333;animation:pulse 1.4s infinite}
@keyframes pulse{50%{opacity:.6}}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--line)}
.btn.ok{background:var(--ok)} .btn.warn{background:var(--warn)}
.btn[disabled]{opacity:.5;cursor:not-allowed}
input,select,textarea{font:inherit;padding:11px;border:1px solid var(--line);
  border-radius:10px;background:var(--card);color:var(--fg);width:100%}
label{display:block;margin:10px 0 4px;font-size:14px;color:var(--muted)}
table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:9px 8px;border-bottom:1px solid var(--line);font-size:15px}
.pill{display:inline-block;border:1px solid var(--line);border-radius:999px;
  padding:2px 10px;font-size:13px;color:var(--muted)}
.pill.on{background:var(--ok);color:#fff;border-color:transparent}
.pill.wait{background:var(--accent2);color:#111;border-color:transparent}
.bar{height:8px;background:var(--line);border-radius:99px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--ok)}
/* --- the teaching surface: BIG type, one button --- */
.teach .unit{font-size:30px;line-height:1.9;margin:0 0 26px}
.teach .unit.locked{opacity:.35}
.he{direction:rtl;text-align:right;font-family:"Frank Ruhl Libre","Times New Roman",serif}
.tr{font-size:.62em;color:var(--muted);direction:ltr;text-align:left;margin-top:.35em}
.reader .unit{font-size:21px;line-height:1.85;margin:0 0 20px;
  padding-bottom:14px;border-bottom:1px dashed var(--line)}
.marker{border:0;border-top:2px solid var(--accent2);margin:24px 0;position:relative}
.marker span{position:absolute;top:-11px;left:50%;transform:translateX(-50%);
  background:var(--bg);padding:0 10px;font-size:12px;color:var(--accent2)}
.w{cursor:pointer;border-bottom:1px dotted transparent}
.w:hover{border-bottom-color:var(--accent2)}
.foot{text-align:center;color:var(--muted);font-size:12px;padding:20px}
.err{background:#b0202015;border:1px solid #b02020;color:#b02020;
  padding:12px;border-radius:10px;margin-bottom:14px}
.hero{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:24px;text-align:center;margin-bottom:18px}
.hero .why{color:var(--muted);font-size:15px;margin-bottom:6px}
.hero .t{font-size:22px;font-weight:600;margin-bottom:16px}
/* --- PWA: one toast, bottom of the screen, above the home indicator --- */
.rcd-toast{position:fixed;left:12px;right:12px;z-index:50;
  bottom:calc(env(safe-area-inset-bottom) + 12px);
  display:none;gap:12px;align-items:center;flex-wrap:wrap;
  background:var(--accent);color:#fff;border-radius:var(--r);
  padding:13px 16px;font-size:15px;box-shadow:0 6px 22px #0004}
.rcd-toast.show{display:flex}
.rcd-toast span{flex:1 1 200px}
.rcd-toast button{background:#fff2;color:#fff;border:1px solid #fff6;
  border-radius:9px;padding:8px 14px;font:inherit;cursor:pointer}
.rcd-toast button[disabled]{opacity:.5;cursor:not-allowed}
.rcd-toast.ok{background:var(--ok)}
.rcd-toast.warn{background:var(--warn)}
@media (min-width:640px){.rcd-toast{left:auto;right:18px;max-width:520px}}
.offline-badge{display:none;background:var(--warn);color:#fff;border-radius:999px;
  padding:2px 10px;font-size:12px}
body.is-offline .offline-badge{display:inline-block}
/* --- Kurz: listen. The box reserves its own height BEFORE the player exists,
   so arriving at a lesson does not shove the text down a second later. --- */
.listen{margin:12px 0}
.listen-frame,.listen iframe{width:100%;aspect-ratio:16/9;height:auto;
  border:0;border-radius:var(--r);background:#000;display:block}
.listen-wait{padding:14px 0}
.listen .btn{margin-top:8px}