:root {
  --bg: #f7f7fb;
  --card: #ffffff;
  --card-2: #f0f0f6;
  --text: #1c1e2b;
  --text-dim: #6b7080;
  --accent: #6c5ce7;
  --accent-2: #00b3ae;
  --danger: #e0453c;
  --border: #e3e4ee;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, "Noto Sans Thai", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

header { text-align: center; margin-bottom: 24px; }
header h1 { margin: 0 0 6px; font-size: 28px; }
.subtitle { color: var(--text-dim); margin: 0; font-size: 14px; }

.upload-card, .player-card, .library-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 1px 3px rgba(20,20,50,0.04);
}

.upload-card {
  text-align: center;
  border-style: dashed;
  transition: border-color .2s, background .2s;
  cursor: pointer;
}
.section-title {
  margin: 0 0 14px;
  font-size: 18px;
  text-align: left;
}
.upload-card.dragover {
  border-color: var(--accent);
  background: var(--card-2);
}
.upload-icon { font-size: 32px; margin-bottom: 8px; }
.hint { color: var(--text-dim); font-size: 12px; margin-top: 8px; }

.btn {
  border: none;
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 14px;
  cursor: pointer;
  color: var(--text);
  background: var(--card-2);
  transition: transform .1s, background .2s;
}
.btn:hover { background: #e6e6f2; }
.btn:active { transform: scale(0.96); }
.btn.primary { background: var(--accent); color: white; font-weight: 600; }
.btn.primary:hover { background: #7d6cf0; }
.btn.small { padding: 6px 12px; font-size: 13px; }
.btn.icon { font-size: 18px; padding: 10px 14px; border-radius: 50%; }
.btn.icon.large { font-size: 22px; padding: 14px 18px; background: var(--accent); }

.progress-list { margin-top: 10px; text-align: left; }
.progress-item { font-size: 13px; color: var(--text-dim); padding: 4px 0; }
.progress-item.error { color: var(--danger); }
.progress-item.done { color: var(--accent-2); }

.now-playing { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; }
.disc {
  width: 56px; height: 56px; flex-shrink: 0;
  border-radius: 50%;
  background: var(--card-2);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
}
.disc.spinning { animation: spin 3s linear infinite; }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.track-info { flex: 1; min-width: 0; }
.track-name { font-weight: 600; margin-bottom: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.time-row { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--text-dim); }
.time-row input[type="range"] { flex: 1; }

.controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.speed-control, .volume-control {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-dim);
  margin-left: auto;
}
.volume-control input[type="range"] { width: 80px; }

select {
  background: var(--card-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 8px;
}

input[type="range"] {
  -webkit-appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

.library-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.library-header h2 { margin: 0; font-size: 18px; }

.file-list { list-style: none; margin: 0; padding: 0; }
.file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  transition: background .15s;
}
.file-item:hover { background: var(--card-2); }
.file-item.active { background: rgba(108,92,231,0.18); border: 1px solid var(--accent); }
.file-item .f-icon { font-size: 20px; }
.file-item .f-meta { flex: 1; min-width: 0; }
.file-item .f-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: 14px; }
.file-item .f-size { color: var(--text-dim); font-size: 12px; }
.file-item .f-del,
.file-item .f-edit-btn,
.file-item .f-save,
.file-item .f-cancel,
.file-item .f-confirm-del {
  background: transparent;
  font-size: 15px;
  padding: 4px 8px;
  border-radius: 8px;
  flex-shrink: 0;
  border: none;
  color: var(--text);
  cursor: pointer;
}
.file-item .f-del { color: var(--danger); font-size: 16px; }
.file-item .f-del:hover { background: rgba(255,107,107,0.15); }
.file-item .f-edit-btn:hover { background: var(--card-2); }
.file-item .f-save:hover { background: rgba(0,206,201,0.15); }
.file-item .f-cancel:hover { background: rgba(255,107,107,0.15); }
.file-item .f-confirm-del {
  background: var(--danger);
  color: white;
  font-weight: 600;
  padding: 6px 14px;
}
.file-item .f-confirm-del:hover { background: #ff8585; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(20px);
  background: var(--card-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 14px;
  opacity: 0;
  transition: opacity .25s, transform .25s;
  z-index: 1000;
  box-shadow: 0 8px 24px rgba(20,20,50,0.15);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { border-color: var(--danger); color: var(--danger); }

.f-edit { display: flex; align-items: center; gap: 6px; }
.f-name-input {
  flex: 1;
  min-width: 0;
  background: var(--card-2);
  color: var(--text);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 6px 8px;
  font-size: 14px;
  font-family: inherit;
}
.f-ext { color: var(--text-dim); font-size: 13px; flex-shrink: 0; }

.empty-state { text-align: center; color: var(--text-dim); padding: 20px; list-style: none; }