/* =========================================================================
   Ukrainian Trainer — styles
   Phone-first, warm-dark (~2800K), one warm gold accent. House style borrowed
   from the sibling /lyrics site (same palette family, warmed a touch) so the
   two feel like one property. Vanilla CSS, no dependencies.
   ========================================================================= */

:root{
  /* Warm-dark palette. bg/panel are warm near-blacks; ink is a warm off-white;
     accent is the house gold. Grade colors are muted so they read on dark. */
  --bg:#12100c;          /* warm near-black background        */
  --panel:#1b1813;       /* raised card / panel surface       */
  --panel-2:#231f18;     /* second-level raised (pressed)     */
  --ink:#efe9df;         /* warm off-white primary text       */
  --muted:#a49d8f;       /* secondary text                    */
  --faint:#6f685c;       /* tertiary / labels                 */
  --accent:#e0a95a;      /* the one warm accent (gold)        */
  --accent-dim:#8a6a37;  /* accent, dimmed                    */
  --line:#2c2820;        /* hairline borders                  */
  --ok:#7fb98a;          /* qualified / good                  */
  --g-again:#c96a5a;
  --g-hard:#caa24e;
  --g-good:#77b184;
  --g-easy:#6f9dc0;
  --radius:16px;
  --tap:56px;            /* minimum tappable height           */
  --maxw:640px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);min-height:100vh;
  font:400 17px/1.55 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,
       "Helvetica Neue",Arial,"Noto Sans",sans-serif;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  /* the fixed grade bar sits over the bottom; keep content clear of it + the notch */
  padding-bottom:env(safe-area-inset-bottom);
}
button{font-family:inherit}
::selection{background:rgba(224,169,90,.28)}

.wrap{max-width:var(--maxw);margin:0 auto;padding:28px 20px 40px}

/* ---- brand / header ---------------------------------------------------- */
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:22px}
.brand{font:600 13px/1 ui-sans-serif,system-ui,sans-serif;letter-spacing:.16em;
  text-transform:uppercase;color:var(--faint)}
.brand b{color:var(--accent);font-weight:600}
.iconbtn{background:none;border:1px solid var(--line);color:var(--muted);
  width:44px;height:44px;border-radius:12px;font-size:18px;cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;transition:.15s}
.iconbtn:hover{border-color:var(--faint);color:var(--ink)}

h1{font:600 clamp(30px,7vw,42px)/1.05 ui-serif,Georgia,Charter,serif;
  letter-spacing:-.02em;margin:6px 0 4px}
.sub{color:var(--muted);margin:0 0 24px;font-size:.98em}
.sub b{color:var(--ink);font-weight:600}
/* first-visit one-liner (renders only while no progress is tracked) */
.intro{color:var(--muted);margin:2px 0 14px;font-size:.95em;line-height:1.5}

/* ---- overall stat strip ------------------------------------------------ */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:0 0 22px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:14px;
  padding:14px 12px;text-align:center}
.stat .n{font:600 26px/1 ui-serif,Georgia,serif;color:var(--ink)}
.stat .n.due{color:var(--accent)}
.stat .n.q{color:var(--ok)}
.stat .l{margin-top:6px;font-size:.7em;letter-spacing:.1em;text-transform:uppercase;color:var(--faint)}

/* ---- primary CTA ------------------------------------------------------- */
.cta{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;
  min-height:var(--tap);background:var(--accent);color:#1a1408;border:none;
  border-radius:14px;font:600 18px/1 ui-sans-serif,system-ui,sans-serif;
  letter-spacing:.01em;cursor:pointer;transition:.15s;margin:0 0 8px;
  box-shadow:0 1px 0 rgba(255,255,255,.06) inset}
.cta:hover{filter:brightness(1.06)}
.cta:active{transform:translateY(1px)}
.cta[disabled]{background:var(--panel-2);color:var(--faint);cursor:default;box-shadow:none}
.cta .pill{background:rgba(26,20,8,.22);border-radius:999px;padding:3px 10px;font-size:.8em}

/* ---- modules + deck rows ---------------------------------------------- */
.module{margin:30px 0 0}
.module-h{font:600 12px/1 ui-sans-serif,system-ui,sans-serif;letter-spacing:.18em;
  text-transform:uppercase;color:var(--faint);margin:0 0 4px}
.module-d{color:var(--muted);font-size:.85em;margin:0 0 14px}

.deck{display:block;width:100%;text-align:left;background:var(--panel);
  border:1px solid var(--line);border-radius:14px;padding:16px 16px;margin:0 0 12px;
  color:inherit;cursor:pointer;transition:.15s}
.deck:hover{border-color:var(--faint);transform:translateY(-1px)}
.deck:active{transform:translateY(0)}
.deck-top{display:flex;align-items:baseline;justify-content:space-between;gap:12px}
.deck-title{font:600 19px/1.2 ui-serif,Georgia,serif;letter-spacing:-.01em}
.deck-desc{color:var(--muted);font-size:.85em;margin:4px 0 0}
.deck-meta{display:flex;align-items:center;gap:10px;margin:12px 0 0;flex-wrap:wrap}

.badge{font-size:.72em;letter-spacing:.06em;text-transform:uppercase;font-weight:700;
  border-radius:999px;padding:4px 11px;white-space:nowrap}
.badge.due{background:rgba(224,169,90,.14);color:var(--accent);border:1px solid var(--accent-dim)}
.badge.new{background:rgba(164,157,143,.1);color:var(--muted);border:1px solid var(--line)}
.badge.q{background:rgba(127,185,138,.14);color:var(--ok);border:1px solid #3f5a44}
.badge.clear{color:var(--faint);border:1px solid var(--line)}

/* progress bar */
.bar{height:8px;background:var(--panel-2);border-radius:999px;overflow:hidden;
  margin:12px 0 0;border:1px solid var(--line)}
.bar > i{display:block;height:100%;background:linear-gradient(90deg,var(--accent-dim),var(--accent));
  border-radius:999px;transition:width .4s ease}
.bar.q > i{background:linear-gradient(90deg,#4c6b52,var(--ok))}
.bar-l{display:flex;justify-content:space-between;margin:6px 2px 0;
  font-size:.74em;color:var(--faint);letter-spacing:.02em}
.bar-l b{color:var(--muted);font-weight:600}

/* ---- review view ------------------------------------------------------- */
.rev-top{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.rev-top .bar{flex:1;margin:0}
.rev-left{font-size:.8em;color:var(--faint);white-space:nowrap;letter-spacing:.04em}
.rev-left b{color:var(--muted)}

.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 22px;min-height:44vh;display:flex;flex-direction:column;
  justify-content:center;text-align:center;cursor:pointer;transition:.15s;
  margin-bottom:16px}
.card:active{background:var(--panel-2)}
.card.revealed{cursor:default;text-align:left;justify-content:flex-start}
.card-type{align-self:center;font-size:.68em;letter-spacing:.12em;text-transform:uppercase;
  color:var(--faint);border:1px solid var(--line);border-radius:999px;padding:4px 12px;
  margin-bottom:20px}
.card.revealed .card-type{align-self:flex-start}
.front{font:500 clamp(28px,7vw,40px)/1.25 ui-sans-serif,system-ui,sans-serif;
  color:var(--ink);word-break:break-word}
.hint{color:var(--muted);font-size:.9em;margin-top:16px;font-style:italic}
.tap-hint{color:var(--faint);font-size:.82em;letter-spacing:.08em;text-transform:uppercase;
  margin-top:26px}

/* revealed answer block */
.divider{border:none;border-top:1px solid var(--line);margin:20px 0}
.back{font:500 clamp(22px,5.5vw,30px)/1.35 ui-sans-serif,system-ui,sans-serif;color:var(--ink)}
.card .front.small{font-size:clamp(20px,5vw,26px);color:var(--muted);font-weight:500}
.translit{color:var(--faint);font-size:.9em;margin-top:8px;font-style:italic}
.notes{background:var(--panel-2);border:1px solid var(--line);border-radius:12px;
  padding:14px 16px;margin-top:18px;color:var(--muted);font-size:.95em;line-height:1.5}
.notes .k{display:block;font-size:.68em;letter-spacing:.14em;text-transform:uppercase;
  color:var(--faint);margin-bottom:6px}
.example{color:var(--muted);font-size:.95em;margin-top:14px;padding-left:12px;
  border-left:2px solid var(--line)}
.tags{margin-top:14px;display:flex;gap:8px;flex-wrap:wrap}
.tag{font-size:.72em;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:3px 10px}

/* ---- fixed grade bar (thumb zone) ------------------------------------- */
.gradebar{position:fixed;left:0;right:0;bottom:0;background:linear-gradient(180deg,
  rgba(18,16,12,0) 0%,var(--bg) 22%);padding:24px 16px calc(16px + env(safe-area-inset-bottom));
  z-index:20}
.gradebar-inner{max-width:var(--maxw);margin:0 auto;display:grid;
  grid-template-columns:repeat(4,1fr);gap:8px}
.grade{min-height:var(--tap);border:1px solid var(--line);border-radius:14px;
  background:var(--panel);color:var(--ink);cursor:pointer;transition:.12s;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  padding:6px 4px}
.grade:active{transform:translateY(1px)}
.grade .lab{font:600 15px/1 ui-sans-serif,system-ui,sans-serif}
.grade .iv{font-size:.72em;color:var(--faint);letter-spacing:.02em}
.grade.again{border-color:#5a352f}.grade.again .lab{color:var(--g-again)}
.grade.hard{border-color:#5a4c2b}.grade.hard .lab{color:var(--g-hard)}
.grade.good{border-color:#37503d}.grade.good .lab{color:var(--g-good)}
.grade.easy{border-color:#2f465a}.grade.easy .lab{color:var(--g-easy)}
.grade:hover{background:var(--panel-2)}
/* reserve space so fixed bar never covers the card during review */
.reviewing .wrap{padding-bottom:120px}

/* ---- empty / done states ---------------------------------------------- */
.center-state{text-align:center;padding:48px 8px}
.center-state .big{font-size:52px;margin-bottom:12px}
.center-state h2{font:600 26px/1.2 ui-serif,Georgia,serif;margin:0 0 8px}
.center-state p{color:var(--muted);margin:0 0 22px}
.done-stats{display:inline-flex;gap:22px;margin:0 0 26px}
.done-stats .n{font:600 24px/1 ui-serif,Georgia,serif;color:var(--ink)}
.done-stats .l{font-size:.72em;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);margin-top:6px}

/* ---- sheet (settings/reset) ------------------------------------------- */
.sheet-bg{position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:40;
  display:flex;align-items:flex-end;justify-content:center}
.sheet{background:var(--panel);border:1px solid var(--line);border-radius:18px 18px 0 0;
  width:100%;max-width:var(--maxw);padding:24px 20px calc(24px + env(safe-area-inset-bottom))}
.sheet h3{font:600 20px/1 ui-serif,Georgia,serif;margin:0 0 4px}
.sheet p{color:var(--muted);font-size:.9em;margin:0 0 18px}
.sheet .row{display:flex;justify-content:space-between;align-items:center;gap:12px;
  padding:12px 0;border-top:1px solid var(--line);font-size:.92em;color:var(--muted)}
.sheet .row b{color:var(--ink)}
.btn{min-height:48px;border-radius:12px;border:1px solid var(--line);background:var(--panel-2);
  color:var(--ink);font:600 15px/1 ui-sans-serif,system-ui,sans-serif;cursor:pointer;
  padding:0 16px;transition:.15s;width:100%}
.btn:hover{border-color:var(--faint)}
.btn.danger{color:var(--g-again);border-color:#5a352f}
.btn.ghost{background:none}

/* ---- misc -------------------------------------------------------------- */
.muted{color:var(--muted)}
.faint{color:var(--faint)}
.hide{display:none!important}
.err{background:var(--panel);border:1px solid #5a352f;border-radius:14px;padding:18px 18px;
  color:var(--muted);line-height:1.6}
.err b{color:var(--g-again)}
.err code{color:var(--accent);background:var(--panel-2);padding:2px 7px;border-radius:6px;
  font-size:.9em;word-break:break-all}
footer{margin-top:40px;color:var(--faint);font-size:.78em;line-height:1.7;text-align:center}

@media (min-width:560px){
  .wrap{padding-top:40px}
  .grade .lab{font-size:16px}
}