body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: radial-gradient(circle at top left, #f7fff0, #d4efd5 35%, #b7e3d0 70%);
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  color: #1c2b21;
}

header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: linear-gradient(90deg, #7cc58f, #65b5b1);
  color: white;
  font-family: "Silkscreen";
  position: relative;
  box-shadow: 0 10px 20px rgba(21, 54, 44, 0.2);
}

header h1 {
  font-size: 18pt;
  margin: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

#language-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: inherit;
  color: white;
  white-space: nowrap;
  margin-right: 26px;
}

#language-controls select {
  padding: 4px 6px;
  font-size: 14px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

#help-button {
  width: 32px;
  height: 32px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

#install-button {
  width: 32px;
  height: 32px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

#install-button[hidden] {
  display: none;
}

footer {
  font-size: 10pt;
  width: 100%;
  text-align: center;
  color: #98c889;
  margin-top: 15px;
  font-family: "Silkscreen";
  padding: 0px 0px;
}

.sw-version {
  font-size: 9pt;
  opacity: 0.7;
  margin-left: 8px;
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  flex-grow: 1;
  width: 100%;
  padding: 12px 16px 0;
  box-sizing: border-box;
}

#grid-container {
  --rows: 8;
  --cols: 8;
  --cell-base: 52px;
  --cell-size: 52px;
  --cell-gap: 2px;
  display: grid;
  grid-template-columns: repeat(var(--cols), var(--cell-size));
  grid-template-rows: repeat(var(--rows), var(--cell-size));
  gap: var(--cell-gap);
  width: 100%;
  flex: 1 1 auto;
  align-content: center;
  justify-content: start;
  background: rgba(255, 255, 255, 0.6);
  border-radius: 18px;
  padding: 14px;
  box-shadow: 0 18px 35px rgba(24, 53, 40, 0.15);
  overflow: auto;
}

#grid-container.grid-centered {
  justify-content: center;
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  border-radius: 50%;
  background-color: #e6efe7;
  border: 1px solid rgba(36, 75, 60, 0.2);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.cell.highlighted {
  background-color: #4fb36f;
  box-shadow: 0 6px 16px rgba(17, 51, 36, 0.35);
  transform: scale(1.02);
}

.cell.length-1 {
  background-color: #4fb36f;
}

.cell.length-2 {
  background-color: #4ea9b3;
}

.cell.length-3 {
  background-color: #f0c85a;
}

.cell.length-4 {
  background-color: #e68a5b;
}

.cell.playing {
  border: 2px solid #f0d85a;
  background-color: #f6ea84;
}

#button-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

#controls-toggle {
  padding: 8px 12px;
  font-size: 13px;
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  font-weight: 600;
}

#bpm-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 15px;
  width: 100%;
  justify-content: center;
}

#key-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
}

#note-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
  margin-top: 10px;
}

#pulse-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
  margin-top: 10px;
}

#instrument-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
  margin-top: 10px;
}

#articulation-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
  margin-top: 10px;
}

#controls-container {
  width: 100%;
  max-width: 1400px;
  margin-top: 14px;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 16px;
  padding: 14px 16px;
  box-shadow: 0 12px 25px rgba(24, 53, 40, 0.15);
  position: relative;
}

#button-controls button {
  width: 42px;
  height: 42px;
  padding: 0;
  font-size: 14px;
  cursor: pointer;
  border: none;
  border-radius: 999px;
  color: #0f2c1f;
  background: #e7f6e5;
  font-weight: 600;
  box-shadow: 0 6px 14px rgba(23, 54, 40, 0.18);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

#button-controls button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(23, 54, 40, 0.22);
}

#button-controls button:active {
  transform: translateY(1px);
  box-shadow: 0 4px 10px rgba(23, 54, 40, 0.18);
}

.icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.button-label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

#play-pause-button .icon-pause {
  display: none;
}

#play-pause-button.is-playing .icon-pause {
  display: block;
}

#play-pause-button.is-playing .icon-play {
  display: none;
}

#tempo-value {
  width: 25px;
}

#tonic-select,
#scale-select {
  padding: 5px;
  font-size: 16px;
}

#bpm-display {
  width: 10px;
  text-align: center;
}

#export-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 30, 24, 0.45);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 10;
  backdrop-filter: blur(4px);
}

#export-overlay.is-visible {
  display: flex;
}

.export-card {
  background: white;
  border-radius: 18px;
  padding: 24px 26px;
  width: min(320px, 80vw);
  box-shadow: 0 18px 35px rgba(24, 53, 40, 0.25);
  text-align: center;
  animation: exportPop 0.25s ease;
}

.export-title {
  font-weight: 600;
  margin-bottom: 14px;
}

.export-bar {
  height: 10px;
  background: #e0efe3;
  border-radius: 999px;
  overflow: hidden;
}

#export-progress {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #53b378, #5ac7c2);
  border-radius: inherit;
  transition: width 0.2s ease;
}

.export-percent {
  margin-top: 12px;
  font-weight: 600;
  color: #1a3b2c;
}

@keyframes exportPop {
  from {
    transform: scale(0.95);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

#help-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 30, 24, 0.55);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 11;
  backdrop-filter: blur(4px);
  padding: 16px;
  box-sizing: border-box;
}

#help-overlay.is-visible {
  display: flex;
}

.help-card {
  background: white;
  border-radius: 18px;
  padding: 22px 24px;
  width: min(560px, 92vw);
  box-shadow: 0 18px 35px rgba(24, 53, 40, 0.25);
  animation: exportPop 0.25s ease;
}

.help-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.help-header h2 {
  margin: 0;
  font-size: 18px;
}

#help-close {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 999px;
  background: #e7f6e5;
  color: #0f2c1f;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.help-intro {
  margin: 0 0 12px;
}

.help-list {
  margin: 0 0 14px;
  padding-left: 18px;
  color: #1b3a2b;
}

.help-list li {
  margin-bottom: 6px;
}

.help-shortcuts-title {
  font-weight: 600;
  margin-bottom: 6px;
}

.help-shortcut {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #1b3a2b;
}

.help-shortcut kbd {
  font-family: "Space Grotesk", sans-serif;
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid #c6e2cf;
  background: #f4fbf1;
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.1);
}

@media (max-width: 700px) {
  main {
    width: 100%;
    padding: 10px;
  }

  header {
    flex-direction: column;
    align-items: center;
    padding: 10px 12px;
    gap: 10px;
  }

  #button-controls {
    width: 100%;
    justify-content: center;
  }

  #controls-toggle {
    width: auto;
    max-width: 280px;
    margin: 0 auto;
    text-align: center;
    align-self: center;
    display: inline-flex;
    justify-content: center;
    line-height: 1.2;
  }

  #language-controls {
    width: 100%;
    justify-content: center;
  }

  #controls-container {
    padding: 12px;
  }

  /* Controles: que quepan bien en móvil */
  #bpm-controls {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    margin-bottom: 10px;
  }

  #bpm-controls input[type="range"] {
    width: 100%;
  }

  #key-controls {
    flex-wrap: wrap;
    gap: 8px;
  }

  #note-controls,
  #pulse-controls,
  #instrument-controls,
  #articulation-controls {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
  }

  #tonic-select,
  #scale-select,
  #note-count-select,
  #pulse-count-select,
  #instrument-select,
  #articulation-select {
    flex: 1 1 180px;
    min-width: 160px;
    font-size: 14px;
  }

  #grid-container {
    max-width: 100%;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
  }
}

@media (min-width: 701px) and (max-width: 899px) {
  /* Tablet: 2 columnas para aprovechar ancho sin scroll horizontal */
  header {
    flex-wrap: wrap;
    justify-content: center;
  }

  #button-controls {
    flex: 1 1 100%;
    order: 2;
  }

  #controls-toggle {
    order: 3;
    width: auto;
    max-width: 280px;
    margin: 0 auto;
  }

  #language-controls {
    order: 4;
  }

  #controls-container {
    padding: 12px;
  }

  #bpm-controls {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    margin-bottom: 10px;
  }

  #bpm-controls input[type="range"] {
    width: 100%;
  }

  #key-controls {
    flex-wrap: wrap;
    gap: 8px;
  }

  #note-controls,
  #pulse-controls,
  #instrument-controls,
  #articulation-controls {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
  }

  #tonic-select,
  #scale-select,
  #note-count-select,
  #pulse-count-select,
  #instrument-select,
  #articulation-select {
    flex: 1 1 180px;
    min-width: 160px;
    font-size: 14px;
  }

  #key-controls,
  #note-controls,
  #pulse-controls,
  #instrument-controls,
  #articulation-controls {
    margin-top: 0;
  }
}

@media (min-width: 900px) {
  header {
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    align-items: center;
  }

  .header-left {
    grid-column: 1;
  }

  #button-controls {
    grid-column: 2;
    justify-content: center;
    flex-wrap: nowrap;
  }

  #controls-toggle {
    grid-column: 3;
    justify-self: end;
  }

  #language-controls {
    grid-column: 4;
    justify-self: end;
  }

  /* Desktop: todo en una sola línea */
  #controls-container {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: center;
    gap: 14px;
    overflow-x: auto;
    overflow-y: hidden;
  }

  #bpm-controls,
  #key-controls,
  #note-controls,
  #pulse-controls,
  #instrument-controls,
  #articulation-controls {
    width: auto;
    margin: 0;
    flex: 0 0 auto;
    white-space: nowrap;
  }
}

body.controls-collapsed #controls-container {
  display: none;
}

body.controls-fixed #controls-container {
  position: sticky;
  top: 76px;
  z-index: 2;
}