:root {
  --bg: #12141a;
  --panel: #1b1e27;
  --panel-2: #232734;
  --accent: #7dd3fc;
  --accent-2: #0ea5e9;
  --text: #e8eaf0;
  --text-dim: #9aa1b2;
  --danger: #e11d48;
  --border: #2c3140;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: 'Segoe UI', 'Hiragino Sans', 'Yu Gothic', sans-serif; overflow-x: hidden; }

.app { min-height: 100vh; display: flex; flex-direction: column; }

.topbar { display: flex; align-items: baseline; gap: 10px; padding: 14px 20px; background: linear-gradient(180deg, #1a1d26, #14161d); border-bottom: 1px solid var(--border); }
.topbar h1 { font-size: 1.3rem; margin: 0; letter-spacing: 0.5px; }
.ver { color: var(--text-dim); font-size: 0.8rem; }

.layout { flex: 1; display: grid; grid-template-columns: 260px 1fr; grid-template-rows: auto auto; gap: 14px; padding: 16px; max-width: 1400px; margin: 0 auto; width: 100%; }

.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 14px; display: flex; flex-direction: column; gap: 14px; }
.controls { grid-row: 1 / 3; }
.transport { grid-column: 2; grid-row: 2; flex-direction: row; flex-wrap: wrap; align-items: flex-start; gap: 24px; }

.keyboard-wrap { grid-column: 2; grid-row: 1; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 14px; display: flex; flex-direction: column; gap: 10px; }

.control-group { display: flex; flex-direction: column; gap: 6px; min-width: 160px; }
.control-group label { font-size: 0.78rem; color: var(--text-dim); }
select, input[type=file], input[type=range] { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); border-radius: 6px; padding: 6px 8px; font-size: 0.85rem; }
input[type=file] { padding: 4px; }

button { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 7px 12px; font-size: 0.82rem; cursor: pointer; transition: background 0.15s, transform 0.05s; }
button:hover:not(:disabled) { background: #2b3040; border-color: var(--accent-2); }
button:active:not(:disabled) { transform: scale(0.97); }
button:disabled { opacity: 0.4; cursor: not-allowed; }
#recBtn.active { background: var(--danger); border-color: var(--danger); color: white; }
#editModeBtn.active { background: var(--danger); border-color: var(--danger); color: white; }
#bindModeBtn.active { background: var(--accent-2); border-color: var(--accent-2); color: white; }

.btnrow { display: flex; align-items: center; gap: 8px; }
.btnrow.wrap { flex-wrap: wrap; }

.hint { font-size: 0.75rem; color: var(--text-dim); }

.progress-wrap { width: 100%; height: 6px; background: var(--panel-2); border-radius: 3px; overflow: hidden; margin-top: 4px; }
.progress-bar { height: 100%; width: 0%; background: var(--accent-2); transition: width 0.15s; }

/* ---- 鍵盤 ---- */
.piano { position: relative; width: 100%; height: 220px; background: #0c0e13; border-radius: 8px; overflow: hidden; user-select: none; touch-action: none; }
/* black-layer は透明な全面コンテナのため pointer-events:none にし、
   実際に鍵盤がある .pkey 側だけ auto に戻す (でないと黒鍵のない
   隙間のクリックが下の白鍵まで届かず、白鍵が押せなくなる) */
.key-layer { position: absolute; inset: 0; pointer-events: none; }
.white-layer { z-index: 1; }
.black-layer { z-index: 2; }

.pkey { position: absolute; top: 0; border-radius: 0 0 6px 6px; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; padding-bottom: 8px; cursor: pointer; transition: background 0.05s; pointer-events: auto; }
.pkey.white { height: 100%; background: #f2f3f8; border: 1px solid #0005; color: #333; }
.pkey.white.active { background: var(--accent); }
.pkey.black { height: 60%; background: #181a20; border: 1px solid #000; color: #eee; z-index: 3; }
.pkey.black.active { background: var(--accent-2); }

.pkey-label { font-size: 0.68rem; opacity: 0.85; pointer-events: none; }
.pkey-pckey { font-size: 0.6rem; opacity: 0.55; font-family: monospace; pointer-events: none; letter-spacing: 0.5px; }
.pkey.black .pkey-pckey { font-size: 0.55rem; }
.pkey-badge { position: absolute; top: 6px; left: 50%; transform: translateX(-50%); background: var(--danger); color: white; font-size: 0.65rem; font-weight: bold; border-radius: 50%; width: 18px; height: 18px; align-items: center; justify-content: center; display: none; pointer-events: none; }

.piano.edit-mode { outline: 2px dashed var(--danger); outline-offset: 3px; }
.piano.edit-mode .pkey { cursor: text; }
.piano.bind-mode { outline: 2px dashed var(--accent-2); outline-offset: 3px; }
.piano.bind-mode .pkey { cursor: cell; }

.help { font-size: 0.75rem; color: var(--text-dim); margin: 0; }
kbd { background: var(--panel-2); border: 1px solid var(--border); border-radius: 4px; padding: 1px 5px; font-family: monospace; }

.footnote { text-align: center; padding: 10px; font-size: 0.72rem; color: var(--text-dim); border-top: 1px solid var(--border); }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .controls { grid-row: auto; flex-direction: row; flex-wrap: wrap; }
  .control-group { flex: 1 1 140px; }
  .keyboard-wrap { grid-column: 1; grid-row: auto; }
  .transport { grid-column: 1; grid-row: auto; }
  .piano { height: 180px; }
}