/* ═══════════════════════════════════════════════════════════════════════════
   TAMIL BOOKSHELF — MIDI COMMON CSS  v5.0
   midi-common.css  —  shared by all instrument pages
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── CSS CUSTOM PROPERTIES ───────────────────────────────────────────────── */
:root {
  /* Core backgrounds */
  --bg:        #070509;
  --bg2:       #0c0a10;
  --surface:   #111018;
  --surface2:  #17141f;
  --surface3:  #1e1a28;
  --surface4:  #252030;

  /* Player accent (overridden dynamically per genre) */
  --player-accent:     #8b5cf6;
  --player-accent-dim: rgba(139,92,246,.14);
  --player-accent-glow:rgba(139,92,246,.25);

  /* Borders */
  --border:    rgba(255,255,255,.07);
  --border2:   rgba(255,255,255,.12);
  --border3:   rgba(255,255,255,.2);

  /* Text */
  --cream:      #f0eafc;
  --cream-dim:  #c0b8d0;
  --text:       #ccc4e0;
  --text-dim:   #806a99;
  --text-muted: #4a3866;
  --signal:     #00e5a0;

  /* Fonts */
  --font-display: 'Cormorant Garamond', serif;
  --font-body:    'Outfit', sans-serif;
  --font-mono:    'DM Mono', 'Courier New', monospace;

  /* Layout */
  --nav-h:     58px;
  --sidebar-w: 220px;
  --r-sm:      5px;
  --r:         8px;
  --r-lg:      14px;
}

/* ── RESET & BASE ────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14px;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── SCROLLBAR ───────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: rgba(139,92,246,.25); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--player-accent); }

/* ── PAGES ───────────────────────────────────────────────────────────────── */
.page { display: none; }
.page.active { display: block; }

/* ── LOADING OVERLAY ─────────────────────────────────────────────────────── */
#loading-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background: radial-gradient(ellipse at center, #0d0818 0%, #070509 100%);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  transition: opacity .6s ease; overflow: hidden;
}
.loader-logo {
  font-family: var(--font-display);
  font-size: 3rem; font-weight: 700; color: var(--cream);
  letter-spacing: -1px; margin-bottom: 6px; position: relative; z-index: 1;
}
.loader-logo span {
  background: linear-gradient(135deg, var(--player-accent), #f43f5e);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.loader-sub {
  font-size: .62rem; color: var(--text-dim); letter-spacing: 5px;
  text-transform: uppercase; margin-bottom: 38px; z-index: 1; position: relative;
}
.music-bars {
  display: flex; align-items: flex-end; gap: 5px;
  height: 44px; margin-bottom: 26px; position: relative; z-index: 1;
}
.music-bars span {
  width: 4px; border-radius: 2px;
  background: var(--player-accent);
  animation: barBounce 1.1s ease-in-out infinite;
}
.music-bars span:nth-child(2) { animation-delay: .12s; }
.music-bars span:nth-child(3) { animation-delay: .24s; filter: hue-rotate(30deg); }
.music-bars span:nth-child(4) { animation-delay: .36s; }
.music-bars span:nth-child(5) { animation-delay: .48s; filter: hue-rotate(60deg); }
@keyframes barBounce { 0%,100% { height: 5px; } 50% { height: 44px; } }

.loader-text {
  color: var(--text-dim); font-size: .85rem; margin-bottom: 18px;
  min-height: 22px; text-align: center; z-index: 1; position: relative;
}
.loader-bar-wrap {
  width: 280px; height: 2px;
  background: rgba(139,92,246,.12); border-radius: 2px; overflow: hidden;
  z-index: 1; position: relative;
}
#loader-progress {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--player-accent), #f43f5e);
  border-radius: 2px; transition: width .35s ease;
  box-shadow: 0 0 8px var(--player-accent-glow);
}
.enter-btn {
  margin-top: 34px; padding: 14px 52px;
  background: linear-gradient(135deg, var(--player-accent), #f43f5e);
  border: none; border-radius: 50px;
  color: #fff; font-family: var(--font-body); font-size: .95rem; font-weight: 700;
  letter-spacing: .8px; cursor: pointer; display: none;
  box-shadow: 0 4px 24px var(--player-accent-glow);
  animation: btnPulse 2.5s ease infinite; transition: transform .2s;
  position: relative; z-index: 1;
}
.enter-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 36px var(--player-accent-glow); }
@keyframes btnPulse {
  0%,100% { box-shadow: 0 4px 24px var(--player-accent-glow), 0 0 0 0 var(--player-accent-dim); }
  50%      { box-shadow: 0 4px 24px var(--player-accent-glow), 0 0 0 14px transparent; }
}

/* ── NAVIGATION ──────────────────────────────────────────────────────────── */
nav {
  display: flex; align-items: center; gap: 12px;
  padding: 0 22px; height: var(--nav-h);
  background: rgba(11,9,16,.93);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 500;
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
}
nav::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--player-accent) 30%, var(--player-accent) 70%, transparent);
  opacity: .3;
}
.logo {
  font-family: var(--font-display); font-size: 1.5rem; font-weight: 700;
  color: var(--cream); white-space: nowrap; text-decoration: none; letter-spacing: -.5px;
}
.logo span {
  background: linear-gradient(135deg, var(--player-accent), #f43f5e);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.yamaha-title {
  font-size: .7rem; color: #c7c7c7; letter-spacing: 3.5px;
  text-transform: uppercase; border: 1px solid var(--border2); border-radius: 4px;
  padding: 3px 10px; white-space: nowrap;
}
.nav-links { display: flex; gap: 14px; margin-left: auto; flex-wrap: wrap; }
.nav-links a {
  color: var(--text-dim); text-decoration: none; font-size: 1rem; font-weight: 500;
  transition: color .2s; padding-bottom: 2px; position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
  background: var(--player-accent); transform: scaleX(0); transition: transform .2s;
}
.nav-links a:hover { color: var(--cream); }
.nav-links a:hover::after { transform: scaleX(1); }

/* ── LAYOUT — SIDEBAR + MAIN ─────────────────────────────────────────────── */
#explorer-section.with-sidebar {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: auto 1fr;
  min-height: calc(100vh - var(--nav-h));
}

/* ── SIDEBAR ─────────────────────────────────────────────────────────────── */
#sidebar {
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  grid-row: 1 / -1;
  position: sticky; top: var(--nav-h);
  height: calc(100vh - var(--nav-h));
  overflow-y: auto; overflow-x: hidden;
  display: flex; flex-direction: column;
}
.sidebar-header {
  padding: 14px 16px 10px;
  font-family: var(--font-display); font-size: 1.2rem; font-weight: 700;
  color: var(--cream); border-bottom: 1px solid var(--border);
}

/* Tab bar in sidebar */
.tab-row {
  display: flex; border-bottom: 1px solid var(--border);
}
.tab-btn {
  flex: 1; padding: 8px 4px; border: none; background: transparent;
  color: var(--text-dim); font-family: var(--font-body); font-size: .72rem;
  font-weight: 500; cursor: pointer; transition: all .2s; position: relative;
  letter-spacing: .5px; text-transform: uppercase;
}
.tab-btn::after {
  content: ''; position: absolute; bottom: 0; left: 20%; right: 20%; height: 2px;
  background: var(--player-accent); border-radius: 2px;
  transform: scaleX(0); transition: transform .2s;
}
.tab-btn.active { color: var(--cream); }
.tab-btn.active::after { transform: scaleX(1); }
.tab-btn:hover { color: var(--text); }

/* Tab content (folder grid) */
.tab-folder-grid {
  display: flex; flex-direction: column; gap: 2px; padding: 8px 0;
}
.tab-folder-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 14px; border: none; background: transparent;
  color: var(--text-dim); font-family: var(--font-body); font-size: .78rem;
  cursor: pointer; transition: all .15s; text-align: left; border-radius: 0;
  width: 100%;
}
.tab-folder-btn:hover { background: rgba(255,255,255,.04); color: var(--cream); }
.tf-icon { font-size: 1rem; flex-shrink: 0; width: 22px; text-align: center; }
.tf-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tf-count {
  font-size: .62rem; color: var(--text-muted);
  background: rgba(255,255,255,.05); border-radius: 10px; padding: 1px 6px;
  flex-shrink: 0;
}

/* Sidebar category list */
#sidebar-cat-list { list-style: none; flex: 1; padding: 4px 0; }
.sidebar-item {
  display: flex; align-items: center; gap: 9px;
  padding: 8px 16px; cursor: pointer; transition: all .15s;
  font-size: .8rem; color: var(--text-dim);
}
.sidebar-item:hover { background: rgba(255,255,255,.04); color: var(--cream); }
.sidebar-item.active {
  background: var(--player-accent-dim);
  color: var(--cream); border-right: 2px solid var(--player-accent);
}
.si-icon { font-size: .95rem; width: 22px; text-align: center; flex-shrink: 0; }
.si-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sidebar-group-header {
  padding: 12px 16px 4px; font-size: .58rem; letter-spacing: 2px;
  text-transform: uppercase; color: var(--text-muted); font-weight: 600;
  border-top: 1px solid var(--border); margin-top: 6px;
}

/* Main content area */
#main-content { min-width: 0; }

/* ── CATEGORY BAR ─────────────────────────────────────────────────────────── */
.cat-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 22px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap; position: relative;
}
.mega-wrapper { position: relative; }
.nav-btn {
  padding: 6px 14px; border: 1px solid var(--border2); border-radius: var(--r-sm);
  background: var(--player-accent-dim); color: var(--cream);
  font-family: var(--font-body); font-size: .78rem; font-weight: 500;
  cursor: pointer; transition: all .2s; display: flex; align-items: center; gap: 6px;
}
.nav-btn:hover { background: rgba(139,92,246,.2); border-color: var(--player-accent); }
.mega-menu {
  display: none; position: absolute; top: calc(100% + 8px); left: 0;
  width: 660px; background: #0a0812;
  border: 1px solid var(--border2); border-radius: var(--r-lg); padding: 24px;
  z-index: 999; box-shadow: 0 24px 60px rgba(0,0,0,.9);
}
.mega-menu.show { display: block; animation: megaIn .2s ease; }
@keyframes megaIn { from { opacity:0; transform:translateY(-8px); } to { opacity:1; transform:translateY(0); } }
.mega-inner { display: grid; grid-template-columns: 1fr 1fr 1.4fr; gap: 24px; }
.mega-col-title {
  font-size: .62rem; color: var(--player-accent); text-transform: uppercase;
  letter-spacing: 2.5px; font-weight: 600; margin-bottom: 12px;
  padding-bottom: 6px; border-bottom: 1px solid var(--border);
}
.mega-item {
  display: flex; align-items: center; gap: 8px;
  color: var(--text-dim); padding: 6px; font-size: .82rem;
  text-decoration: none; border-radius: 5px; transition: all .15s;
}
.mega-item:hover { color: var(--cream); padding-left: 10px; background: var(--player-accent-dim); }
.mega-item .item-title { font-size: 1rem; }
.mega-item .item-info { display: flex; flex-direction: column; }
.alpha-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 4px; }
.alpha-grid a {
  background: rgba(255,255,255,.025); text-align: center;
  padding: 5px 2px; border-radius: 4px; font-size: .7rem;
  color: var(--text-dim); text-decoration: none; transition: all .15s;
}
.alpha-grid a:hover { background: var(--player-accent); color: #fff; font-weight: 600; }
.item-desc {
    font-size: 0.8rem !important;
}
.cat-btn {
  padding: 5px 14px; border: 1px solid var(--border); border-radius: 20px;
  background: transparent; color: var(--text-dim);
  font-family: var(--font-body); font-size: .78rem; cursor: pointer;
  transition: all .2s; white-space: nowrap; text-transform: capitalize;
}
.cat-btn:hover { background: var(--player-accent-dim); color: var(--cream); border-color: var(--border2); }
.cat-btn.active {
  background: var(--player-accent); color: #fff; border-color: var(--player-accent);
  font-weight: 600; box-shadow: 0 2px 10px var(--player-accent-glow);
}
.mega-btn {
  padding: 6px 10px; border: 1px solid var(--border); border-radius: 6px;
  background: transparent; color: var(--text-dim); font-size: 1.2rem;
  cursor: pointer; transition: all .2s; display: flex; align-items: center;
  gap: 5px; margin-left: auto;
}
.mega-btn:hover { border-color: var(--player-accent); color: var(--player-accent); transform: rotate(30deg); }

/* ── SEARCH ROW ──────────────────────────────────────────────────────────── */
.srch-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px 10px; flex-wrap: wrap; gap: 10px;
}
.srch-box {
  display: flex; align-items: center; max-width: 520px; flex: 1;
  border-radius: var(--r); overflow: hidden;
  border: 1px solid var(--border); transition: border-color .2s;
  background: rgba(255,255,255,.025);
}
.srch-box:focus-within { border-color: var(--player-accent); }
.srch-box input {
  flex: 1; padding: 10px 16px; background: transparent; border: none;
  color: var(--cream); font-family: var(--font-body); font-size: .88rem; outline: none;
}
.srch-box input::placeholder { color: var(--text-muted); }
.srch-box button {
  padding: 10px 22px; background: var(--player-accent);
  border: none; color: #fff; cursor: pointer; font-size: .82rem; font-weight: 600;
  transition: opacity .2s;
}
.srch-box button:hover { opacity: .85; }
#song-counter {
  font-size: .72rem; color: var(--player-accent); font-weight: 500;
  padding: 5px 14px; background: var(--player-accent-dim);
  border: 1px solid var(--border2); border-radius: 20px; white-space: nowrap;
}
#status-msg { display: none; }

/* ── SECTION LABELS ──────────────────────────────────────────────────────── */
.sec-label {
  font-family: var(--font-display); font-size: 1.2rem; font-weight: 700;
  color: var(--cream); padding: 20px 22px 12px;
  display: flex; align-items: center; gap: 10px;
  border-bottom: 1px solid var(--border);
}
.sec-rule {
  width: 28px; height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--player-accent), #f43f5e);
  flex-shrink: 0;
}

/* ── CARDS GRID ──────────────────────────────────────────────────────────── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(198px, 1fr));
  gap: 14px; padding: 16px 22px;
}
.empty-msg {
  grid-column: 1/-1; color: var(--text-dim);
  font-size: .85rem; padding: 32px; text-align: center;
}

/* ── MIDI CARD ───────────────────────────────────────────────────────────── */
.midi-card {
  background: linear-gradient(160deg, #131020 0%, #0c0a14 100%);
  border: 1px solid var(--border);
  border-radius: var(--r-lg); overflow: hidden; cursor: pointer;
  transition: transform .18s cubic-bezier(.2,.8,.4,1), border-color .2s, box-shadow .2s;
  position: relative;
}
.midi-card::before {
  content: ''; position: absolute; inset: 0; border-radius: inherit;
  background: linear-gradient(160deg, rgba(139,92,246,.025) 0%, transparent 60%);
  pointer-events: none; z-index: 0;
}
.midi-card:hover {
  transform: translateY(-5px) scale(1.01);
  border-color: var(--border3);
  box-shadow: 0 16px 40px rgba(0,0,0,.6), 0 0 0 1px rgba(255,255,255,.06);
}
.midi-card.best { border-color: rgba(20,184,166,.2); }
.midi-card.fav  { border-color: rgba(244,63,94,.2); }
.midi-card.playing {
  border-color: var(--player-accent);
  box-shadow: 0 0 0 2px var(--player-accent-dim), 0 12px 36px var(--player-accent-glow);
}
.card-thumb {
  height: 88px; display: flex; align-items: center; justify-content: center;
  border-bottom: 1px solid var(--border); font-size: 2rem;
  position: relative; overflow: hidden;
}
.folder-emoji { position: relative; z-index: 1; }
.playing-indicator {
  position: absolute; inset: 0; display: none;
  align-items: center; justify-content: center; gap: 4px; z-index: 2;
}
.midi-card.playing .card-thumb .playing-indicator { display: flex; }
.playing-bar {
  width: 3px; border-radius: 2px;
  animation: barBounce .75s ease infinite;
}
.playing-bar:nth-child(2) { animation-delay: .12s; }
.playing-bar:nth-child(3) { animation-delay: .24s; }

/* Genre badge on card thumb */
.card-genre-badge {
  position: absolute; bottom: 6px; left: 50%; transform: translateX(-50%);
  font-size: .56rem; font-weight: 600; padding: 2px 8px;
  border-radius: 10px; border: 1px solid; letter-spacing: .5px;
  white-space: nowrap; max-width: 90%; overflow: hidden; text-overflow: ellipsis;
  opacity: .9; z-index: 2; text-transform: uppercase;
}
.card-body { padding: 10px 13px 13px; position: relative; z-index: 1; }
.card-title {
  font-size: .84rem; font-weight: 500; color: var(--cream);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  text-transform: capitalize; margin-bottom: 4px;
}
.card-folder {
  font-size: .66rem; margin-bottom: 9px;
  text-transform: capitalize; display: flex; align-items: center; gap: 4px;
}
.card-actions { display: flex; gap: 5px; }
.card-actions button {
  flex: 1; padding: 6px 3px; border: 1px solid var(--border); border-radius: var(--r-sm);
  background: rgba(255,255,255,.02); color: var(--text-dim);
  font-size: .66rem; cursor: pointer; transition: all .2s;
  display: flex; align-items: center; justify-content: center; gap: 3px;
}
.card-actions button:hover { background: var(--player-accent-dim); color: var(--cream); border-color: var(--border2); }
.card-actions button.fav-on { background: rgba(244,63,94,.1); color: #fb7185; border-color: rgba(244,63,94,.3); }
.load-more-btn {
  display: none; margin: 8px auto 90px; padding: 10px 44px;
  background: transparent; border: 1px solid var(--border2); border-radius: 50px;
  color: var(--text-dim); font-family: var(--font-body); font-size: .82rem;
  cursor: pointer; transition: all .2s;
}
.load-more-btn:hover { border-color: var(--player-accent); color: var(--cream); box-shadow: 0 0 14px var(--player-accent-glow); }

/* ── PLAYER HEADER ───────────────────────────────────────────────────────── */
.player-header {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 22px;
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.back-btn {
  padding: 7px 18px; background: rgba(255,255,255,.04);
  border: 1px solid var(--border); border-radius: var(--r-sm);
  color: var(--text); font-family: var(--font-body); font-size: .78rem;
  font-weight: 500; cursor: pointer; display: flex; align-items: center; gap: 6px;
  transition: all .2s;
}
.back-btn:hover { border-color: var(--player-accent); color: var(--cream); }
.player-song-title {
  flex: 1; text-align: center;
  font-family: var(--font-display); font-size: 1.3rem; font-weight: 700;
  color: var(--cream); text-transform: capitalize;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.learn-wrap { position: relative; display: inline-block; }
.learn-btn {
  padding: 7px 14px; background: rgba(20,184,166,.1);
  border: 1px solid rgba(20,184,166,.28); border-radius: var(--r-sm);
  color: #14b8a6; font-family: var(--font-body); font-size: .76rem; font-weight: 600;
  cursor: pointer; display: flex; align-items: center; gap: 5px; transition: all .2s;
}
.learn-btn:hover { background: rgba(20,184,166,.2); }
#learn-dropdown {
  display: none; position: absolute; right: 0; top: calc(100% + 5px);
  background: #0a0812; border: 1px solid var(--border2); border-radius: var(--r);
  min-width: 172px; z-index: 400; box-shadow: 0 12px 36px rgba(0,0,0,.9);
}
.learn-wrap:hover #learn-dropdown { display: block; }
#learn-dropdown a {
  display: flex; align-items: center; gap: 8px;
  color: var(--text); padding: 10px 14px; font-size: .8rem;
  text-decoration: none; border-bottom: 1px solid var(--border); transition: all .2s;
}
#learn-dropdown a:last-child { border: none; }
#learn-dropdown a:hover { background: rgba(20,184,166,.1); color: #14b8a6; }

/* ── SEEK BAR ────────────────────────────────────────────────────────────── */
.seek-wrap { display: flex; align-items: center; gap: 10px; padding: 10px 0 12px; }
.seek-label { font-size: .66rem; color: #ffffff; font-family: var(--font-mono); white-space: nowrap; }
.seek-bar {
  flex: 1; height: 4px;
  background: rgba(255,255,255,.07);
  border-radius: 2px; cursor: pointer; position: relative; transition: height .15s;
}
.seek-bar:hover { height: 6px; }
.seek-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--player-accent), #f43f5e);
  border-radius: 2px; pointer-events: none; transition: width .5s linear; position: relative;
}
.seek-fill::after {
  content: ''; position: absolute; right: -5px; top: 50%; transform: translateY(-50%);
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--cream); box-shadow: 0 0 6px var(--player-accent-glow);
  opacity: 0; transition: opacity .15s;
}
.seek-bar:hover .seek-fill::after { opacity: 1; }

/* ── PLAYER ZONE ─────────────────────────────────────────────────────────── */
.player-zone { padding: 0 0 18px; }
.now-row {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 0 10px; border-bottom: 1px solid var(--border); margin-bottom: 6px;
}
.now-info .now-label {
  font-size: .62rem; color: #ffffff; text-transform: uppercase; letter-spacing: 2.5px; margin-bottom: 3px;
}
.now-info .now-title {
  font-family: var(--font-display); font-size: 1.2rem; font-weight: 700;
  background: linear-gradient(135deg, var(--player-accent), #f43f5e);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  text-transform: capitalize; line-height: 1.2;
}
.time-display {
  font-size: .9rem; color: #ffffff; font-family: var(--font-mono);
  margin-left: auto; white-space: nowrap;
  background: var(--surface2); border: 1px solid var(--border); border-radius: 6px; padding: 5px 10px;
}

/* ── CONTROLS ROW ────────────────────────────────────────────────────────── */
.controls-row {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding-bottom: 14px; border-bottom: 1px solid var(--border);
}
.ctrl-btn {
  width: 46px; height: 46px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  border: none; cursor: pointer; font-size: 1rem; transition: all .22s;
}
.ctrl-btn.primary {
  background: linear-gradient(135deg, var(--player-accent), #f43f5e); color: #fff;
  box-shadow: 0 4px 16px var(--player-accent-glow);
}
.ctrl-btn.primary:hover { transform: scale(1.1); box-shadow: 0 6px 28px var(--player-accent-glow); }
.ctrl-btn.secondary { background: rgba(255,255,255,.04); border: 1px solid var(--border); color: var(--text); }
.ctrl-btn.secondary:hover { border-color: var(--player-accent); color: var(--cream); }
.ctrl-btn.active-loop { background: var(--player-accent-dim); border-color: var(--player-accent); color: var(--cream); }

.right-actions { display: flex; gap: 7px; margin-left: auto; flex-wrap: wrap; }
.act-btn {
  padding: 9px 12px; border: 1px solid var(--border); border-radius: var(--r-sm);
  background: rgba(255,255,255,.02); color: #ffffff;
  font-size: .9rem; cursor: pointer; transition: all .2s;
  display: flex; align-items: center; gap: 5px; font-family: var(--font-body);
}
.act-btn:hover { border-color: var(--player-accent); color: var(--cream); background: var(--player-accent-dim); }
.act-btn.on { border-color: rgba(244,63,94,.4); background: rgba(244,63,94,.1); color: #fb7185; }

/* ── ADVANCED OPTIONS ROW ────────────────────────────────────────────────── */
.adv-row {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  padding: 12px 0 14px; border-bottom: 1px solid var(--border);
}
.adv-group { display: flex; align-items: center; gap: 8px; }
.adv-label {
  font-size: .62rem; color: var(--text-dim); letter-spacing: 1.5px;
  text-transform: uppercase; white-space: nowrap;
}
.adv-slider {
  -webkit-appearance: none; appearance: none;
  width: 88px; height: 3px; background: rgba(255,255,255,.1);
  border-radius: 2px; outline: none; cursor: pointer;
}
.adv-slider::-webkit-slider-thumb {
  -webkit-appearance: none; width: 13px; height: 13px;
  border-radius: 50%; background: var(--player-accent);
  cursor: pointer; box-shadow: 0 0 5px var(--player-accent-glow); transition: transform .15s;
}
.adv-slider::-webkit-slider-thumb:hover { transform: scale(1.3); }
.adv-slider::-moz-range-thumb {
  width: 13px; height: 13px; border: none; border-radius: 50%;
  background: var(--player-accent); cursor: pointer;
}
.adv-value {
  font-size: .68rem; color: var(--cream); font-family: var(--font-mono);
  min-width: 30px; text-align: right;
}
.speed-pills { display: flex; gap: 4px; }
.speed-pill {
  padding: 4px 9px; border: 1px solid var(--border); border-radius: 20px;
  background: transparent; color: var(--text-dim); font-size: .66rem;
  font-family: var(--font-body); cursor: pointer; transition: all .15s;
}
.speed-pill:hover { border-color: var(--border2); color: var(--cream); }
.speed-pill.active { background: var(--player-accent); color: #fff; border-color: var(--player-accent); font-weight: 600; }

/* ── INSTRUMENT DROPUP ───────────────────────────────────────────────────── */
.inst-wrap { position: relative; display: inline-block; }
.inst-btn {
  padding: 9px 13px; background: var(--player-accent-dim);
  border: 1px solid var(--border2); border-radius: var(--r-sm);
  color: var(--cream); font-family: var(--font-body); font-size: .74rem; font-weight: 600;
  cursor: pointer; display: flex; align-items: center; gap: 6px; transition: all .2s;
}
.inst-btn:hover { background: rgba(139,92,246,.2); }
.inst-menu {
  display: none; position: absolute; bottom: calc(100% + 0px); left: 0;
  background: #0a0812; border: 1px solid var(--border2); border-radius: var(--r);
  min-width: 215px; max-height: 270px; overflow-y: auto;
  z-index: 300; box-shadow: 0 -12px 40px rgba(0,0,0,.9);
}
.inst-wrap:hover .inst-menu { display: block; }
.inst-menu a {
  display: block; padding: 9px 14px; color: var(--text);
  font-size: .8rem; text-decoration: none; cursor: pointer;
  border-bottom: 1px solid var(--border); transition: all .2s;
}
.inst-menu a:last-child { border: none; }
.inst-menu a:hover { background: var(--player-accent-dim); color: var(--cream); }
.inst-menu a.active-inst { color: var(--player-accent); font-weight: 600; }

/* ── RELATED ─────────────────────────────────────────────────────────────── */
.related-wrap { padding: 0 22px 130px; }
.related-label {
  font-family: var(--font-display); font-size: 1.05rem; color: var(--cream);
  padding: 14px 0 12px; border-bottom: 1px solid var(--border);
  margin-bottom: 14px; display: flex; align-items: center; gap: 8px;
}

/* ── FIXED FOOTER PLAYER ─────────────────────────────────────────────────── */
#fixed-player-footer {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: rgba(11,9,16,.95);
  border-top: 1px solid var(--border2);
  padding: 10px 22px; z-index: 600;
  backdrop-filter: blur(22px); -webkit-backdrop-filter: blur(22px);
}
#fixed-player-footer::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--player-accent) 30%, var(--player-accent) 70%, transparent);
  opacity: .35;
}
.footer-inner {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  max-width: 1600px; margin: 0 auto; position: relative; z-index: 1;
}
.fp-info { flex: 1; min-width: 120px; overflow: hidden; }
.fp-title {
  font-size: .8rem; font-weight: 500;
  background: linear-gradient(135deg, var(--player-accent), #f43f5e);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; text-transform: capitalize;
}
.fp-time { font-size: .67rem; color: var(--text-dim); font-family: var(--font-mono); }
.fp-ctrls { display: flex; gap: 7px; align-items: center; }
.fp-btn {
  width: 38px; height: 38px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  border: none; cursor: pointer; font-size: .86rem; transition: all .2s;
}
.fp-btn.play-btn {
  background: linear-gradient(135deg, var(--player-accent), #f43f5e);
  color: #fff; box-shadow: 0 2px 12px var(--player-accent-glow);
}
.fp-btn.play-btn:hover { transform: scale(1.08); }
.fp-btn.nav-btn { background: rgba(255,255,255,.04); border: 1px solid var(--border); color: var(--text); }
.fp-btn.nav-btn:hover { border-color: var(--player-accent); color: var(--cream); }
.fp-extra { display: flex; gap: 6px; margin-left: auto; }
.fp-ext-btn {
  padding: 7px 11px; border: 1px solid var(--border);
  border-radius: 5px; background: transparent; color: var(--text-dim);
  font-size: .7rem; cursor: pointer; transition: all .2s;
  display: flex; align-items: center; gap: 4px;
}
.fp-ext-btn:hover { color: var(--cream); border-color: var(--player-accent); }
.fp-ext-btn.on { color: #fb7185; border-color: rgba(244,63,94,.4); }
.fp-seek {
  flex: 1; min-width: 80px; max-width: 200px; height: 3px;
  background: rgba(255,255,255,.07); border-radius: 2px; cursor: pointer; position: relative;
}
.fp-seek-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--player-accent), #f43f5e);
  border-radius: 2px; pointer-events: none; transition: width .5s linear;
}

/* ── MIDIPLAYERINTERFACE WRAPPER ─────────────────────────────────────────── */
#midiPlayerInterface { padding: 0 22px; position: relative; }

/* ── RESPONSIVE ──────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  #explorer-section.with-sidebar { grid-template-columns: 1fr; }
  #sidebar { display: none; }
}
@media (max-width: 768px) {
  nav { flex-wrap: nowrap; padding: 8px 14px; }
  .nav-links, .musicss { display: none; }
  .mega-menu { width: 95vw; }
  .mega-inner { grid-template-columns: 1fr; gap: 14px; }
  .player-song-title { font-size: .95rem; }
  .footer-inner { gap: 8px; }
  .fp-extra, .fp-seek { display: none; }
  .cards-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 10px; padding: 12px 14px; }
  #midiPlayerInterface { padding: 0 14px; }
  .related-wrap, .cat-bar, .srch-row, .player-header { padding-left: 14px; padding-right: 14px; }
  .sec-label { padding-left: 14px; }
  .adv-row { gap: 10px; }
  .adv-slider { width: 70px; }
}
/* ── SIDEBAR LIST ITEMS (sb-* matches buildSidebar output) ──────────────── */
#sb-cat-list { list-style: none; padding: 4px 0; }

.sb-group {
  padding: 12px 16px 4px;
  font-size: .58rem; letter-spacing: 2px; text-transform: uppercase;
  color: var(--text-muted); font-weight: 600;
  border-top: 1px solid var(--border); margin-top: 6px;
}
.sb-group:first-child { border-top: none; margin-top: 0; }

.sb-item {
  display: flex; align-items: center; gap: 9px;
  padding: 7px 14px; cursor: pointer; transition: all .15s;
  font-size: .79rem; color: var(--text-dim);
  border-right: 2px solid transparent;
}
.sb-item:hover {
  background: rgba(255,255,255,.04); color: var(--cream);
}
.sb-item.active {
  background: var(--player-accent-dim); color: var(--cream);
  border-right-color: var(--player-accent);
}
.sb-icon  { font-size: .95rem; width: 22px; text-align: center; flex-shrink: 0; }
.sb-label { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sb-count {
  font-size: .6rem; color: var(--text-muted);
  background: rgba(255,255,255,.05); border-radius: 10px;
  padding: 1px 6px; flex-shrink: 0;
}

/* ── TAB FOLDER BUTTONS (tab-folder-btn, used by buildTabContent) ────────── */
.tab-folder-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 14px; border: none;
  background: var(--fb, transparent);
  color: var(--text-dim);
  font-family: var(--font-body); font-size: .78rem;
  cursor: pointer; transition: all .15s;
  text-align: left; width: 100%; border-radius: 0;
}
.tab-folder-btn:hover {
  background: rgba(255,255,255,.05); color: var(--cream);
}
.tab-folder-btn.active {
  background: var(--fb, var(--player-accent-dim));
  color: var(--fc, var(--cream));
  border-right: 2px solid var(--fc, var(--player-accent));
}
.tfb-name {
  flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  color: inherit;
}
.tfb-cnt {
  font-size: .6rem; color: var(--text-muted);
  background: rgba(255,255,255,.05); border-radius: 10px;
  padding: 1px 6px; flex-shrink: 0;
}
/* ═══════════════════════════════════════════════════════════════════════════
   midi-common ADDITIONS — append to midi-common.css
   1. Explorer/Player mutual visibility
   2. Sidebar accordion tabs (sb-tabs)
   3. Sidebar sb-* item classes
   4. tab-folder-btn fix
═══════════════════════════════════════════════════════════════════════════ */

/* ── 1. PAGE VISIBILITY ──────────────────────────────────────────────────── */
/*  .page { display:none } already in midi-common.css
    .page.active { display:block }
    For explorer we need the grid layout when active, not just block.       */
#explorer-section.page         { display: none; }
#explorer-section.page.active  { display: grid; }   /* restores with-sidebar grid */
#player-section.page           { display: none; }
#player-section.page.active    { display: block; }


/* ── 2. SIDEBAR STRUCTURE ────────────────────────────────────────────────── */
#sidebar {
  display: flex;
  flex-direction: column;
  /* sb-cat-list gets flex:1 so it takes all available space,
     pushing .sb-tabs to the bottom                                         */
}

#sb-cat-list {
  flex: 1;          /* fills remaining height, pushes tabs down */
  overflow-y: auto;
  list-style: none;
  padding: 4px 0;
}


/* ── 3. SIDEBAR ITEM CLASSES (matches buildSidebar output) ──────────────── */
.sb-group {
  padding: 12px 16px 4px;
  font-size: .58rem; letter-spacing: 2px; text-transform: uppercase;
  color: var(--text-muted); font-weight: 600;
  border-top: 1px solid var(--border); margin-top: 6px;
}
.sb-group:first-child { border-top: none; margin-top: 0; }

.sb-item {
  display: flex; align-items: center; gap: 9px;
  padding: 7px 14px; cursor: pointer; transition: all .15s;
  font-size: .79rem; color: var(--text-dim);
  border-right: 2px solid transparent;
}
.sb-item:hover  { background: rgba(255,255,255,.04); color: var(--cream); }
.sb-item.active {
  background: var(--player-accent-dim); color: var(--cream);
  border-right-color: var(--player-accent);
}
.sb-icon  { font-size: .95rem; width: 22px; text-align: center; flex-shrink: 0; }
.sb-label { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sb-count {
  font-size: .6rem; color: var(--text-muted);
  background: rgba(255,255,255,.05); border-radius: 10px;
  padding: 1px 6px; flex-shrink: 0;
}


/* ── 4. ACCORDION TABS at bottom of sidebar ─────────────────────────────── */
.sb-tabs {
  border-top: 1px solid var(--border);
  flex-shrink: 0;          /* never compress — stays at bottom */
}

/* Each accordion item */
.sb-tab-item { border-bottom: 1px solid var(--border); }
.sb-tab-item:last-child { border-bottom: none; }

/* Header button (always visible, click to toggle) */
.sb-tab-hdr {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border: none; background: transparent;
  color: var(--text-dim); font-family: var(--font-body); font-size: .76rem;
  font-weight: 600; letter-spacing: .4px; text-transform: uppercase;
  cursor: pointer; transition: all .18s;
}
.sb-tab-hdr:hover  { background: rgba(255,255,255,.04); color: var(--cream); }
.sb-tab-hdr span   { display: flex; align-items: center; gap: 7px;font-size: .9rem; }
.sb-tab-hdr span i { font-size: .9rem; color: var(--player-accent); }

/* Chevron rotates when open */
.sb-chev { font-size: .75rem; transition: transform .22s ease; }
.sb-tab-item.open .sb-chev { transform: rotate(180deg); }
.sb-tab-item.open .sb-tab-hdr { color: var(--cream); background: var(--player-accent-dim); }

/* Body — collapsed by default, expands on .open */
.sb-tab-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
  /* max-height set via JS to scrollHeight when opening */
}
.sb-tab-item.open .sb-tab-body {
  max-height: 420px;   /* large enough for any list */
  overflow-y: auto;
}

/* Folder buttons inside each tab body (matches buildTabContent output) */
.tab-folder-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 14px; border: none;
  background: var(--fb, transparent);
  color: var(--text-dim);
  font-family: var(--font-body); font-size: .78rem;
  cursor: pointer; transition: all .15s;
  text-align: left; width: 100%; border-radius: 0;
}
.tab-folder-btn:hover  { background: rgba(255,255,255,.05); color: var(--cream); }
.tab-folder-btn.active {
  background: var(--fb, var(--player-accent-dim));
  color: var(--fc, var(--cream));
  border-right: 2px solid var(--fc, var(--player-accent));
}
.tfb-name {
  flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: inherit;
  text-shadow: 1px 1px black;
    font-weight: 700;
    font-size: .9rem;
}
.tfb-cnt {
  font-size: .6rem; color: var(--text-muted);
  background: rgba(255,255,255,.05); border-radius: 10px;
  padding: 1px 6px; flex-shrink: 0;
}


/* ── 5. RESPONSIVE — hide accordion tabs on small screens ───────────────── */
@media (max-width: 900px) {
  .sb-tabs { display: none; }
}
.card-genre-tag {
    font-size: 14px;
}
.nav-btn {
    font-size: 1rem !important;
}