@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,600;9..144,700&family=Work+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@500;700&display=swap');

:root{
  --bg:#12131c;
  --bg-2:#0d0e15;
  --panel:#191b28;
  --panel-2:#212436;
  --border:rgba(255,255,255,0.08);
  --border-strong:rgba(255,255,255,0.16);
  --text:#f1efe4;
  --text-dim:#a6a4bd;
  --text-faint:#6d6c85;
  --accent:#cfa53a;
  --accent-soft:rgba(207,165,58,0.14);
  --accent-strong:#e6bf55;
  --good:#45bb8c;
  --good-soft:rgba(69,187,140,0.16);
  --bad:#e2604f;
  --bad-soft:rgba(226,96,79,0.16);
  --radius-lg:18px;
  --radius-md:12px;
  --radius-sm:8px;
  --font-display:'Fraunces', serif;
  --font-body:'Work Sans', sans-serif;
  --font-mono:'JetBrains Mono', monospace;
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0; width:100%; overflow-x:hidden;}
body{
  background:
    radial-gradient(ellipse 900px 500px at 15% -10%, rgba(207,165,58,0.09), transparent 60%),
    radial-gradient(ellipse 700px 500px at 100% 0%, rgba(69,187,140,0.06), transparent 55%),
    var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}

::selection{background:var(--accent-soft);}

a{color:inherit; text-decoration:none;}
button{font-family:inherit;}
button:focus-visible, input:focus-visible, a:focus-visible{
  outline:2px solid var(--accent-strong);
  outline-offset:2px;
}

.settings-overlay{display:none;}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.001ms !important; transition-duration:0.001ms !important;}
}

.wrap{
  max-width:1180px;
  margin:0 auto;
  padding:28px 20px 60px;
}

/* ---------- Header ---------- */
.site-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  margin-bottom:26px;
  flex-wrap:wrap;
}
.brand{display:flex; align-items:baseline; gap:12px;}
.brand-mark{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.12em;
  color:var(--accent);
  border:1px solid var(--border-strong);
  padding:4px 8px;
  border-radius:6px;
  background:var(--accent-soft);
  transition:border-color .15s, background .15s;
}
a.brand-mark:hover{border-color:var(--accent); background:rgba(207,165,58,0.22);}
h1{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(26px,4vw,34px);
  margin:0;
  letter-spacing:-0.01em;
}

/* Settings toggle (gear) — mobile only */
.settings-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width:42px; height:42px;
  border-radius:50%;
  border:1px solid var(--border-strong);
  background:var(--panel);
  color:var(--accent);
  font-size:19px;
  cursor:pointer;
  flex:none;
  transition:border-color .15s, background .15s;
}
.settings-toggle:hover{border-color:var(--accent); background:var(--accent-soft);}

.settings-close{
  display:none;
  align-items:center;
  justify-content:center;
  width:30px; height:30px;
  border-radius:50%;
  border:1px solid var(--border-strong);
  background:transparent;
  color:var(--text-dim);
  font-size:16px;
  cursor:pointer;
}

.settings-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:16px;
}
.settings-head h2{margin:0;}

/* ---------- Home page ---------- */
.home-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(220px, 1fr));
  gap:16px;
  margin-top:10px;
}
.home-tile{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:8px;
  padding:26px 24px 24px;
  border-radius:var(--radius-lg);
  border:1px solid var(--border);
  background:linear-gradient(180deg, var(--panel), var(--panel-2));
  transition:border-color .18s, transform .15s, background .18s;
}
.home-tile:hover{
  border-color:var(--accent);
  transform:translateY(-2px);
}
.home-tile-title{
  font-family:var(--font-display);
  font-weight:600;
  font-size:22px;
}
.home-tile-desc{
  font-size:13.5px;
  color:var(--text-dim);
  line-height:1.5;
}
.home-tile-arrow{
  margin-top:10px;
  font-family:var(--font-mono);
  color:var(--accent);
  font-size:15px;
  transition:transform .15s;
}
.home-tile:hover .home-tile-arrow{transform:translateX(4px);}

/* ---------- Placeholder pages ---------- */
.placeholder-panel{
  text-align:center;
  padding:50px 24px;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
}
.placeholder-title{
  font-family:var(--font-display);
  font-weight:600;
  font-size:24px;
  color:var(--accent);
}
.placeholder-text{
  color:var(--text-dim);
  font-size:14px;
  margin:0;
}

/* ---------- Layout ---------- */
.app{
  display:grid;
  grid-template-columns:290px 1fr;
  gap:22px;
  align-items:start;
}

.panel{
  background:linear-gradient(180deg, var(--panel), var(--panel-2));
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  padding:20px;
}

/* ---------- Settings ---------- */
.settings h2{
  font-family:var(--font-display);
  font-size:18px;
  font-weight:600;
  margin:0;
}
.field-group{margin-bottom:20px;}
.field-group:last-child{margin-bottom:0;}
.field-label{
  display:flex;
  align-items:center;
  justify-content:space-between;
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:0.08em;
  color:var(--text-faint);
  margin-bottom:9px;
}

.radio-row{display:flex; flex-direction:column; gap:7px;}
.radio-chip{
  display:flex;
  align-items:center;
  gap:9px;
  padding:9px 10px;
  border-radius:var(--radius-sm);
  border:1px solid var(--border);
  cursor:pointer;
  font-size:13.5px;
  transition:border-color .15s, background .15s;
}
.radio-chip:hover{border-color:var(--border-strong);}
.radio-chip input{
  appearance:none; -webkit-appearance:none;
  width:15px; height:15px;
  border-radius:50%;
  border:1.5px solid var(--text-faint);
  display:grid; place-content:center;
  flex:none; cursor:pointer;
}
.radio-chip input::before{
  content:"";
  width:7px;height:7px;
  border-radius:50%;
  background:var(--accent);
  transform:scale(0);
  transition:transform .12s;
}
.radio-chip input:checked::before{transform:scale(1);}
.radio-chip input:checked{border-color:var(--accent);}
.radio-chip.checked{background:var(--accent-soft); border-color:rgba(207,165,58,0.4);}

.pill-row{display:flex; gap:7px;}
.pill-row .radio-chip{flex:1; justify-content:center; padding:9px 4px;}
.pill-row .radio-chip input{display:none;}

.toggle-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:10px 2px 2px;
}
.toggle-row .toggle-label{font-size:13.5px; line-height:1.4;}
.toggle-row .toggle-sub{font-size:11.5px; color:var(--text-faint); margin-top:2px;}
.switch{
  position:relative;
  width:40px; height:23px;
  flex:none;
}
.switch input{
  opacity:0; width:100%; height:100%; margin:0; position:absolute; cursor:pointer; z-index:1;
}
.switch .track{
  position:absolute; inset:0;
  background:rgba(255,255,255,0.12);
  border-radius:20px;
  transition:background .15s;
  border:1px solid var(--border);
}
.switch .knob{
  position:absolute; top:2px; left:2px;
  width:17px; height:17px;
  border-radius:50%;
  background:var(--text-dim);
  transition:transform .15s, background .15s;
}
.switch input:checked ~ .track{background:var(--accent-soft); border-color:rgba(207,165,58,0.5);}
.switch input:checked ~ .knob{transform:translateX(17px); background:var(--accent);}

#settingsWarn{
  display:none;
  font-size:12.5px;
  color:var(--bad);
  background:var(--bad-soft);
  border:1px solid rgba(226,96,79,0.3);
  padding:8px 10px;
  border-radius:var(--radius-sm);
  margin-bottom:14px;
}

/* ---------- Main / game area ---------- */
.main-col{display:flex; flex-direction:column; gap:18px;}

.scoreboard{
  display:flex;
  gap:14px;
}
.score-card{
  flex:1;
  background:linear-gradient(180deg, var(--panel), var(--panel-2));
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:16px;
  text-align:center;
}
.score-card .num{
  font-family:var(--font-mono);
  font-size:26px;
  font-weight:700;
}
.score-card.correct .num{color:var(--good);}
.score-card.wrong .num{color:var(--bad);}
.score-card.acc .num{color:var(--accent);}

.stage{
  border-radius:var(--radius-lg);
  border:1px solid var(--border);
  background:
    radial-gradient(ellipse 520px 260px at 50% 0%, rgba(207,165,58,0.08), transparent 65%),
    linear-gradient(180deg, var(--panel), var(--bg-2));
  padding:24px 22px;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:18px;
}

.action-row{
  display:flex;
  gap:12px;
  width:100%;
}
.action-btn{
  flex:1;
  min-width:110px;
  padding:16px 18px;
  border-radius:var(--radius-md);
  font-size:15px;
  font-weight:600;
  cursor:pointer;
  transition:transform .12s, filter .15s, border-color .15s, background .15s;
}
.action-btn:active:not(:disabled){transform:scale(0.97);}
.action-btn:disabled{opacity:0.4; cursor:not-allowed;}
.action-btn.primary{
  background:linear-gradient(180deg, var(--accent-strong), var(--accent));
  color:#20180a;
  border:none;
}
.action-btn.primary:hover:not(:disabled){filter:brightness(1.06);}
.action-btn.secondary{
  background:transparent;
  border:1px solid var(--border-strong);
  color:var(--text);
}
.action-btn.secondary:hover:not(:disabled){border-color:var(--accent); background:var(--accent-soft);}

.ghost-btn{
  display:inline-block;
  background:transparent;
  border:1px solid var(--border-strong);
  color:var(--text);
  padding:9px 18px;
  border-radius:999px;
  font-size:13.5px;
  cursor:pointer;
  transition:border-color .15s, background .15s;
}
.ghost-btn:hover{border-color:var(--accent); background:var(--accent-soft);}

/* ---------- Interval / chord tiles (settings + answers, merged) ---------- */
.tiles-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(180px,1fr));
  gap:9px;
}
.tiles-grid.symbols{
  grid-template-columns:repeat(auto-fill, minmax(120px,1fr));
}

.interval-tile{
  display:flex;
  align-items:center;
  gap:10px;
  padding:11px 13px;
  border-radius:var(--radius-md);
  border:1px solid var(--border);
  background:rgba(255,255,255,0.02);
  transition:border-color .15s, background .15s, opacity .15s;
}
.interval-tile:hover{border-color:var(--accent);}

.tile-check{
  flex:none;
  display:flex;
  cursor:pointer;
  padding:3px;
}
.tile-check input{
  appearance:none;
  -webkit-appearance:none;
  width:16px;height:16px;
  border-radius:4px;
  border:1.5px solid var(--text-faint);
  display:grid;
  place-content:center;
  cursor:pointer;
  background:transparent;
  margin:0;
}
.tile-check input::before{
  content:"";
  width:8px;height:8px;
  border-radius:2px;
  background:var(--accent);
  transform:scale(0);
  transition:transform .12s;
}
.tile-check input:checked::before{transform:scale(1);}
.tile-check input:checked{border-color:var(--accent);}

.tile-body{
  flex:1;
  cursor:pointer;
  font-size:13.5px;
  font-weight:500;
}

/* Symbol tiles (intervals/chords/dominants): true two-row stack.
   Row 1 = the sign itself (○ / + / D / number) plus its quality mark.
   Row 2 = the bass-note figure, centered directly BELOW the sign —
   a real line break, not a small side subscript. */
.tiles-grid.symbols .tile-body{
  display:flex;
  flex-direction:column;
  align-items:center;
  text-align:center;
  font-family:var(--font-display);
  gap:3px;
}
.sym-top{
  font-size:22px;
  line-height:1;
  display:inline-flex;
  align-items:flex-start;
}
.sym-top .sym-base{font-weight:600;}
.sym-top sup{
  font-size:0.5em;
  font-family:var(--font-mono);
  margin-left:1px;
}
.sym-bass{
  font-size:12px;
  font-family:var(--font-mono);
  color:var(--text-dim);
  border-top:1px solid var(--border-strong);
  padding-top:3px;
  min-width:1.6em;
  line-height:1;
}
.sym-bass s{text-decoration-color:#ffffff; text-decoration-thickness:1.5px;}
.interval-tile.correct .sym-bass{color:var(--good); border-top-color:var(--good);}
.interval-tile.wrong .sym-bass{color:var(--bad); border-top-color:var(--bad);}

.interval-tile.excluded{opacity:0.4;}
.interval-tile.excluded .tile-body{cursor:default;}

.interval-tile.correct{
  background:var(--good-soft);
  border-color:var(--good);
  color:var(--good);
}
.interval-tile.wrong{
  background:var(--bad-soft);
  border-color:var(--bad);
  color:var(--bad);
}

/* ---------- Mobile ---------- */
@media (max-width:900px){
  .app{grid-template-columns:1fr;}

  .settings-toggle{display:flex;}

  .settings{
    position:fixed;
    top:0; right:0;
    height:100vh;
    width:84%;
    max-width:320px;
    z-index:60;
    transform:translateX(105%);
    transition:transform .25s ease;
    border-radius:0;
    overflow-y:auto;
    box-shadow:-10px 0 30px rgba(0,0,0,0.4);
  }
  .settings.open{transform:translateX(0);}
  .settings-close{display:flex;}

  .settings-overlay{
    position:fixed;
    inset:0;
    background:rgba(6,6,10,0.55);
    z-index:55;
  }
  .settings-overlay.open{display:block;}
}

@media (max-width:600px){
  .tiles-grid{
    grid-template-columns:repeat(auto-fill, minmax(var(--tile-min-mobile, 96px),1fr));
    gap:7px;
  }
  .interval-tile{
    padding:9px 8px;
    gap:6px;
    flex-direction:column;
    align-items:stretch;
    text-align:center;
  }
  .tile-check{align-self:flex-end; padding:0;}
  .tile-body{font-size:12px;}
  .tiles-grid.symbols .tile-body{font-size:19px;}
  .sym-bass{font-size:11px;}
  .action-row{gap:8px;}
  .action-btn{padding:14px 8px; font-size:13.5px;}
}

footer{
  text-align:center;
  color:var(--text-faint);
  font-size:11.5px;
  margin-top:34px;
}