:root {
  --bg: #f6f5f2;
  --panel: #ffffff;
  --border: #e3e0da;
  --text: #2b2a28;
  --text-dim: #767268;
  --accent: #8a5a3b;
  --accent-bg: #f1e6da;
  --chord: #a8632f;
  --song-font-size: 15.5px;
}

/* Тема песни: пользовательские варианты (сохраняются в localStorage) */
body[data-song-theme="sepia"] {
  --panel: #f4ecd8;
  --bg: #ece2c8;
  --text: #4a3826;
}
body[data-song-theme="dark"] {
  --panel: #1e1c1a;
  --bg: #141312;
  --text: #eae7e1;
  --text-dim: #a19b8f;
  --border: #34302b;
  --accent-bg: #3a2c1f;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
#app { display: flex; height: 100vh; }

/* Sidebar */
#sidebar {
  width: 380px;
  min-width: 280px;
  max-width: 45vw;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  background: var(--panel);
}
#sidebar-header { padding: 16px 16px 10px; border-bottom: 1px solid var(--border); }
#sidebar-header h1 { font-size: 17px; margin: 0 0 10px; font-weight: 600; }
#search {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: var(--bg);
  color: var(--text);
}
#theme-details { margin-top: 10px; }
#theme-summary {
  font-size: 12.5px;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
  padding: 4px 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 4px;
}
#theme-summary::-webkit-details-marker { display: none; }
#theme-summary::before { content: "▸"; font-size: 10px; transition: transform .15s ease; }
#theme-details[open] #theme-summary::before { transform: rotate(90deg); }
#theme-summary .active-badge {
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  padding: 1px 7px;
  font-size: 11px;
}
#theme-filter { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.theme-chip {
  font-size: 12px;
  padding: 4px 9px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}
.theme-chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }
#count { font-size: 12px; color: var(--text-dim); padding: 8px 16px 4px; }
#list { flex: 1; overflow-y: auto; padding: 4px 0 16px; }
.song-item { padding: 10px 16px; cursor: pointer; border-bottom: 1px solid var(--border); }
.song-item:hover { background: var(--accent-bg); }
.song-item.active { background: var(--accent-bg); border-left: 3px solid var(--accent); }
.song-item .num { font-size: 12px; color: var(--text-dim); margin-right: 6px; }
.song-item .name { font-size: 14.5px; font-weight: 500; }
.song-item .eng { font-size: 12.5px; color: var(--text-dim); }
.song-item .themes { font-size: 11px; color: var(--text-dim); margin-top: 2px; }

/* Main pane */
#main { flex: 1; overflow-y: auto; padding: 32px 40px 60px; }
#placeholder { color: var(--text-dim); font-size: 15px; padding-top: 100px; text-align: center; }
#song-title { font-size: 26px; margin: 0 0 4px; font-weight: 700; }
#song-eng { font-size: 15px; color: var(--text-dim); margin: 0 0 14px; }
#song-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.meta-tag { font-size: 12px; background: var(--accent-bg); color: var(--accent); padding: 3px 10px; border-radius: 999px; }
#song-copyright { font-size: 12.5px; color: var(--text-dim); margin-bottom: 18px; font-style: italic; }
#song-audio { margin-bottom: 20px; }
#song-audio audio { width: 100%; max-width: 420px; }

/* Панель управления видом/тональностью */
#view-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  padding: 12px 14px;
  margin-bottom: 20px;
  background: var(--accent-bg);
  border-radius: 10px;
  font-size: 13px;
}
.control-group { display: flex; align-items: center; gap: 8px; }
.control-label { color: var(--text-dim); font-size: 12px; }
.transpose-btn, .fontsize-btn {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.transpose-btn:hover, .fontsize-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
#transpose-value { min-width: 68px; text-align: center; font-weight: 600; }
#transpose-value .orig { color: var(--text-dim); font-weight: 400; font-size: 11px; }
.theme-swatches { display: flex; gap: 6px; }
.theme-swatch {
  width: 22px; height: 22px; border-radius: 50%;
  border: 2px solid transparent; cursor: pointer;
}
.theme-swatch[data-theme="light"] { background: #f6f5f2; }
.theme-swatch[data-theme="sepia"] { background: #ece2c8; }
.theme-swatch[data-theme="dark"] { background: #1e1c1a; }
.theme-swatch.active { border-color: var(--accent); }

#song-text {
  font-size: var(--song-font-size);
  line-height: 1.85;
  max-width: 720px;
  white-space: normal;
}
#song-text .chord {
  color: var(--chord);
  font-weight: 700;
}
#song-text strong { font-weight: 700; }

::-webkit-scrollbar { width: 9px; }
::-webkit-scrollbar-thumb { background: #d8d4cc; border-radius: 6px; }

#back-btn { display: none; }

@media (max-width: 760px) {
  html, body { overscroll-behavior-y: contain; }
  #app { position: relative; height: 100dvh; overflow: hidden; }
  #sidebar {
    position: absolute; inset: 0; width: 100%; max-width: 100%; height: 100%;
    transition: transform .22s ease; z-index: 1;
  }
  #main {
    position: absolute; inset: 0; width: 100%; height: 100%;
    overflow-y: auto; padding: 16px 18px 60px;
    transform: translateX(100%); transition: transform .22s ease;
    z-index: 2; background: var(--panel);
  }
  #app.show-song #sidebar { transform: translateX(-100%); }
  #app.show-song #main { transform: translateX(0); }

  #sidebar-header { padding: 14px 14px 8px; }
  #search { padding: 11px 12px; font-size: 16px; }
  .song-item { padding: 13px 14px; }
  .theme-chip { padding: 6px 11px; font-size: 12.5px; }

  #back-btn {
    display: flex; align-items: center; gap: 6px;
    background: none; border: none; color: var(--accent);
    font-size: 15px; font-weight: 600; padding: 6px 0 16px;
    cursor: pointer; -webkit-tap-highlight-color: transparent;
  }
  #song-title { font-size: 21px; }
  #song-text { max-width: 100%; }
  #song-audio audio { max-width: 100%; }
  #view-controls { gap: 12px; padding: 10px 12px; }
}