:root {
  --bg: #1a1a2e;
  --surface: #16213e;
  --accent: #e94560;
  --accent2: #0f3460;
  --text: #eaeaea;
  --text-dim: #888;
  --radius: 12px;
  --btn-h: 64px;
}

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

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
}

#app {
  max-width: 600px;
  margin: 0 auto;
  padding: 16px;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
  min-height: 100vh;
}
/* gap fallback: margin between every direct child */
#app > * + * { margin-top: 16px; }

/* Status bar */
#status-bar {
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  font-size: 12px;
  color: var(--text-dim);
}
#status-bar > * + * { margin-left: 8px; }
#winamp-status { font-size: 16px; }
#winamp-status.ok { color: #4caf50; }
#winamp-status.err { color: var(--accent); }

/* Track info */
#track-info {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
#track-title {
  font-size: 18px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#star-rating {
  font-size: 32px;
  margin-top: 10px;
  letter-spacing: 4px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
}
.star {
  color: #333;
  -webkit-transition: color 0.12s, -webkit-transform 0.1s;
  transition: color 0.12s, transform 0.1s;
  display: inline-block;
}
.star.lit  { color: #f5a623; }
.star:active { -webkit-transform: scale(1.25); transform: scale(1.25); }

#playlist-pos {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 6px;
}

/* Visualisation canvas */
#viz {
  width: 100%;
  height: 80px;
  border-radius: var(--radius);
  background: #000;
  display: block;
  cursor: pointer;
}

/* Progress */
#progress-wrap {
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
}
#progress-wrap > * + * { margin-top: 4px; }
#progress-bar {
  height: 8px;
  background: var(--accent2);
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
}
#progress-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  -webkit-transition: width 0.5s linear;
  transition: width 0.5s linear;
  border-radius: 4px;
}
#time-display {
  display: -webkit-flex;
  display: flex;
  -webkit-justify-content: space-between;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
}

/* Buttons base */
.btn {
  background: var(--surface);
  color: var(--text);
  border: none;
  border-radius: var(--radius);
  font-size: 22px;
  cursor: pointer;
  -webkit-transition: background 0.15s, -webkit-transform 0.08s;
  transition: background 0.15s, transform 0.08s;
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  -webkit-justify-content: center;
  justify-content: center;
  /* Fallback for iOS 9: <button> ignores justify-content on flex,
     so center the text the old-fashioned way too. */
  text-align: center;
  touch-action: manipulation;
}
.btn:active { -webkit-transform: scale(0.93); transform: scale(0.93); background: var(--accent2); }

/* ── Seek row ────────────────────────────────────────────────────────────── */
/* Base: flexbox (iOS 9 and up) */
#seek-row {
  display: -webkit-flex;
  display: flex;
}
#seek-row > .btn-seek {
  -webkit-flex: 1;
  flex: 1;
}
#seek-row > .btn-seek + .btn-seek { margin-left: 8px; }

/* Enhancement: CSS Grid (iOS 10.3+, all modern browsers) */
@supports (display: grid) {
  #seek-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
  }
  #seek-row > .btn-seek { -webkit-flex: none; flex: none; }
  #seek-row > .btn-seek + .btn-seek { margin-left: 0; }
}

.btn-seek {
  height: 52px;
  font-size: 14px;
  font-weight: 600;
}

/* ── Controls row ───────────────────────────────────────────────────────── */
/* Base: flexbox */
#controls-row {
  display: -webkit-flex;
  display: flex;
}
#controls-row > .btn-ctrl {
  -webkit-flex: 1;
  flex: 1;
}
#controls-row > .btn-ctrl + .btn-ctrl { margin-left: 8px; }

/* Enhancement: CSS Grid */
@supports (display: grid) {
  #controls-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
  }
  #controls-row > .btn-ctrl { -webkit-flex: none; flex: none; }
  #controls-row > .btn-ctrl + .btn-ctrl { margin-left: 0; }
}

.btn-ctrl { height: var(--btn-h); font-size: 28px; }
.btn-play {
  background: var(--accent);
  font-size: 32px;
}
.btn-play:active { background: #c73652; }

/* Volume row */
#volume-row {
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
}
#volume-row > * + * { margin-left: 10px; }
.btn-vol { width: 48px; height: 48px; -webkit-flex-shrink: 0; flex-shrink: 0; font-size: 18px; }
#btn-mute { font-size: 22px; }
#btn-mute.muted { color: var(--accent); }
#volume-bar-wrap {
  -webkit-flex: 1;
  flex: 1;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
}
#volume-bar-wrap > * + * { margin-top: 4px; }
#volume-bar {
  height: 8px;
  background: var(--accent2);
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
}
#volume-fill {
  height: 100%;
  background: #4caf50;
  width: 70%;
  -webkit-transition: width 0.2s;
  transition: width 0.2s;
  border-radius: 4px;
}
#volume-pct {
  font-size: 11px;
  color: var(--text-dim);
  text-align: center;
}
#volume-fill.muted { background: var(--accent); }

/* Killist */
#killist-row {
  display: -webkit-flex;
  display: flex;
}
#killist-row > * + * { margin-left: 8px; }
.btn-kill { -webkit-flex: 1; flex: 1; height: 52px; font-size: 16px; background: #3a1a1a; }
.btn-kill:active { background: var(--accent); }
.btn-kill-list { width: 64px; height: 52px; font-size: 14px; }
.btn-action   { width: 52px; height: 52px; font-size: 20px; }

#killist-panel {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
}
#killist-panel h3 { margin-bottom: 12px; }
#killist-items {
  list-style: none;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
}
#killist-items li + li { margin-top: 8px; }
#killist-items li {
  display: -webkit-flex;
  display: flex;
  -webkit-justify-content: space-between;
  justify-content: space-between;
  -webkit-align-items: center;
  align-items: center;
  background: var(--bg);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 14px;
}
#killist-items li button {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
}
#btn-close-killist { margin-top: 12px; width: 100%; height: 44px; font-size: 15px; }

/* ── Playlist overlay ────────────────────────────────────────────────────── */
#playlist-overlay {
  position: fixed;
  /* inset: 0 fallback for browsers without inset support (iOS < 14.5) */
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 200;
  background: var(--bg);
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
}
#playlist-header {
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  -webkit-justify-content: space-between;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--surface);
  border-bottom: 1px solid #ffffff12;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
}
#playlist-title-label {
  font-size: 16px;
  font-weight: 600;
}
#btn-close-playlist {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 22px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 8px;
  line-height: 1;
  touch-action: manipulation;
}
#btn-close-playlist:active { background: var(--accent2); color: var(--text); }

#playlist-list {
  list-style: none;
  overflow-y: auto;
  -webkit-flex: 1;
  flex: 1;
  padding: 8px 0;
  -webkit-overflow-scrolling: touch;
}
#playlist-list li {
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  padding: 12px 20px;
  cursor: pointer;
  border-radius: 0;
  -webkit-transition: background 0.1s;
  transition: background 0.1s;
  -webkit-tap-highlight-color: transparent;
}
#playlist-list li > * + * { margin-left: 12px; }
#playlist-list li:active { background: var(--accent2); }
#playlist-list li.current {
  background: #e9456018;
  border-left: 3px solid var(--accent);
  padding-left: 17px;
}
.pl-idx {
  font-size: 12px;
  color: var(--text-dim);
  min-width: 32px;
  text-align: right;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
}
.pl-title {
  font-size: 15px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
li.current .pl-title { color: var(--accent); font-weight: 600; }

#playlist-loading {
  text-align: center;
  color: var(--text-dim);
  padding: 40px;
  font-size: 14px;
}

/* ── gap enhancement for all flex containers (iOS 14.5+ / modern browsers) */
@supports (gap: 1px) {
  #app              { gap: 16px; }
  #app > * + *      { margin-top: 0; }

  #status-bar       { gap: 8px; }
  #status-bar > * + * { margin-left: 0; }

  #progress-wrap    { gap: 4px; }
  #progress-wrap > * + * { margin-top: 0; }

  #volume-row       { gap: 10px; }
  #volume-row > * + * { margin-left: 0; }

  #volume-bar-wrap  { gap: 4px; }
  #volume-bar-wrap > * + * { margin-top: 0; }

  #killist-row      { gap: 8px; }
  #killist-row > * + * { margin-left: 0; }

  #killist-items    { gap: 8px; }
  #killist-items li + li { margin-top: 0; }

  #playlist-list li { gap: 12px; }
  #playlist-list li > * + * { margin-left: 0; }
}

.hidden { display: none !important; }