/* EchoKeys - Musical Memory Game */
/* NoteLoop Series by Open Loop Apps */
/* Codename: EchoKeys-NoteLoop */

* { margin: 0; padding: 0; box-sizing: border-box; }

:root{
  --primary:#6366f1; --primary-dark:#4f46e5; --secondary:#8b5cf6;
  --success:#10b981; --error:#ef4444;
  --bg:#0f172a; --card-bg:#1e293b; --text:#f1f5f9; --text-muted:#94a3b8;
  --border:#334155; --key-bg:#334155; --key-active:#6366f1;
  --key-success:#10b981; --key-error:#ef4444;
}

html,body{ overscroll-behavior:none; }
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;
  background:var(--bg); color:var(--text);
  min-height:100vh; display:flex; justify-content:center; align-items:center;
  padding:20px; -webkit-tap-highlight-color:transparent;
}

button,.key{ touch-action:manipulation; }

/* TOAST */
#toast{
  position:fixed; left:50%; top:12px;
  transform:translateX(-50%) translateY(-6px);
  padding:10px 12px; border-radius:14px;
  border:1px solid rgba(148,163,184,.25);
  background:rgba(2,6,23,.55);
  backdrop-filter:blur(8px); -webkit-backdrop-filter:blur(8px);
  color:var(--text); font-size:12px; line-height:1.2;
  opacity:0; pointer-events:none;
  transition:opacity .15s ease, transform .15s ease;
  z-index:2000;
  max-width:min(520px, calc(100vw - 24px));
  text-align:center;
}
#toast.show{ opacity:1; transform:translateX(-50%) translateY(0); }
#toast.ok{ border-color:rgba(16,185,129,.55); }
#toast.bad{ border-color:rgba(239,68,68,.55); }

/* OVERLAY */
.overlay{
  position:fixed; top:0; left:0; width:100%; height:100%;
  background:var(--bg);
  display:flex; justify-content:center; align-items:center;
  z-index:1000; transition:opacity .3s ease;
}
.overlay.hidden{ opacity:0; pointer-events:none; }

.unlock-card{
  background:var(--card-bg);
  border-radius:24px;
  padding:48px 32px;
  text-align:center;
  max-width:420px;
  border:2px solid var(--border);
}
.unlock-card h1{ font-size:48px; margin-bottom:16px; }
.unlock-card p{ color:var(--text-muted); font-size:18px; margin-bottom:22px; }
.unlock-footnote{ margin-top:14px; font-size:12px; color:var(--text-muted); }

kbd{
  font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;
  font-size:11px; padding:2px 6px; border-radius:8px;
  border:1px solid rgba(148,163,184,.35);
  background:rgba(2,6,23,.35); color:var(--text);
}

/* BUTTONS */
.primary-btn,.secondary-btn{
  font-size:18px; font-weight:600;
  padding:16px 32px;
  border-radius:12px;
  border:none; cursor:pointer;
  transition:all .2s ease;
  font-family:inherit; min-width:140px;
}
.primary-btn{ background:var(--primary); color:#fff; }
.primary-btn:hover{ background:var(--primary-dark); transform:translateY(-2px); }
.primary-btn:active{ transform:translateY(0); }

.secondary-btn{
  background:var(--key-bg);
  color:var(--text);
  border:2px solid var(--border);
}
.secondary-btn:hover{ background:var(--border); }

.primary-btn:focus-visible,
.secondary-btn:focus-visible,
.settings-btn:focus-visible{
  outline:2px solid rgba(99,102,241,.65);
  outline-offset:2px;
}

/* GAME CONTAINER */
#game-container{ width:100%; max-width:640px; transition:opacity .3s ease; }
#game-container.hidden{ display:none; }

/* Header */
.game-header{
  display:flex; justify-content:space-between; align-items:center;
  background:var(--card-bg);
  border-radius:16px;
  padding:16px;
  border:2px solid var(--border);
  margin-bottom:16px;
  gap:10px;
  flex-wrap:wrap;
}
.stat{ text-align:center; min-width:70px; }
.label{
  display:block; font-size:12px; color:var(--text-muted);
  text-transform:uppercase; letter-spacing:.05em;
}
.value{ display:block; font-size:24px; font-weight:700; margin-top:4px; }

.settings-btn{
  background:transparent;
  border:2px solid var(--border);
  border-radius:12px;
  padding:10px 12px;
  cursor:pointer;
  font-size:18px;
  color:var(--text);
  transition:all .2s ease;
}
.settings-btn:hover{ background:var(--border); }

/* SETTINGS PANEL */
.settings-panel{
  background:var(--card-bg);
  border-radius:16px;
  padding:20px;
  border:2px solid var(--border);
  margin-bottom:16px;
}
.settings-panel.hidden{ display:none; }
.settings-panel h3{ margin-bottom:16px; font-size:18px; }
.setting-item{ margin-bottom:16px; }

.toggle-label{
  display:flex; align-items:center; gap:12px;
  cursor:pointer; user-select:none;
}
.toggle-label input{ display:none; }
.toggle-slider{
  width:50px; height:26px;
  background:var(--border);
  border-radius:13px;
  position:relative;
  transition:background .2s ease;
}
.toggle-slider::after{
  content:"";
  width:22px; height:22px;
  background:#fff; border-radius:50%;
  position:absolute; top:2px; left:2px;
  transition:transform .2s ease;
}
.toggle-label input:checked + .toggle-slider{ background:var(--primary); }
.toggle-label input:checked + .toggle-slider::after{ transform:translateX(24px); }
.toggle-text{ font-size:16px; }

.settings-actions{ display:flex; gap:12px; flex-wrap:wrap; margin-top:6px; }
.settings-hint{ margin-top:12px; font-size:12px; color:var(--text-muted); line-height:1.4; }

/* STATUS */
.status-message{
  background:var(--card-bg);
  border-radius:16px;
  padding:16px;
  border:2px solid var(--border);
  text-align:center;
  font-size:18px;
  font-weight:600;
  margin-bottom:16px;
  transition:all .3s ease;
}
.status-message.success{ border-color:var(--success); color:var(--success); }
.status-message.error{ border-color:var(--error); color:var(--error); }

/* KEYS */
.keys-container{ display:grid; gap:12px; margin-bottom:16px; }
.key{
  background:var(--key-bg);
  border:2px solid var(--border);
  border-radius:16px;
  padding:20px;
  text-align:center;
  cursor:pointer;
  transition:all .15s ease;
  user-select:none;
  position:relative;
  overflow:hidden;
}
.key:hover{ background:var(--border); }
.key:active{ transform:scale(.98); }
.key.disabled{ opacity:.5; pointer-events:none; }
.key.active{ background:var(--key-active); border-color:var(--primary); transform:scale(1.02); }
.key.success{ background:var(--key-success); border-color:var(--success); }
.key.error{ background:var(--key-error); border-color:var(--error); }

.key-label{ font-size:24px; font-weight:700; margin-bottom:4px; }
.key-note{ font-size:14px; color:var(--text-muted); }

/* ACTION BUTTONS */
.action-buttons{ display:flex; gap:12px; justify-content:center; margin-bottom:16px; flex-wrap:wrap; }
.action-buttons.hidden{ display:none; }
.primary-btn.hidden,.secondary-btn.hidden{ display:none; }

/* FOOTER */
.app-footer{
  text-align:center;
  color:var(--text-muted);
  font-size:12px;
  line-height:1.35;
  padding:8px 0 0 0;
}

@media (max-width:480px){
  body{ padding:12px; }
  .unlock-card{ padding:40px 24px; }
  .unlock-card h1{ font-size:40px; }
  .game-header{ padding:12px; }
  .value{ font-size:20px; }
  .key{ padding:18px; }
  .key-label{ font-size:22px; }
  .primary-btn,.secondary-btn{ padding:14px 24px; font-size:16px; min-width:120px; }
}

@media (prefers-reduced-motion: reduce){
  *{ transition:none !important; animation:none !important; }
}