:root {
  --bg-base: #EEF6FD;
  --text-primary: #204137;
  --text-secondary: rgba(32, 65, 55, 0.75);
  --accent: #FE531F;
  --surface-light: rgba(32, 65, 55, 0.08);
  --surface-strong: rgba(32, 65, 55, 0.14);
  --border-soft: rgba(32, 65, 55, 0.18);
  --shadow-soft: 0 16px 32px rgba(32, 65, 55, 0.15);
  --radius-lg: 18px;
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', sans-serif;
  margin: 0;
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  color: var(--text-primary);
  background: var(--bg-base);
}

.content {
  width: min(1100px, 94vw);
  margin: 0 auto;
  padding-block: clamp(1.75rem, 5vw, 3rem);
  padding-inline: clamp(1.25rem, 4vw, 3rem);
  display: flex;
  flex-direction: column;
  gap: clamp(1.5rem, 4vw, 2.75rem);
}

h1 {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  margin: 0;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  line-height: 1.08;
  color: var(--text-primary);
}

.divcont {
  display: flex;
  justify-content: center;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.drop-area {
  width: min(680px, 100%);
  display: grid;
  gap: 1rem;
}

.drop-zone {
  position: relative;
  width: 100%;
  border-radius: var(--radius-lg);
  border: 2px dashed var(--accent);
  padding: clamp(1.25rem, 3vw, 2rem);
  text-align: center;
  background: var(--bg-base);
  box-shadow: var(--shadow-soft);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  cursor: pointer;
}

.primary {
  background: var(--accent);
  border: none;
  border-radius: calc(var(--radius-lg) - 10px);
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 0.75rem 1.75rem;
  text-transform: uppercase;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 12px 24px rgba(32, 65, 55, 0.15);
}

.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 28px rgba(32, 65, 55, 0.18);
}

.primary:active {
  transform: translateY(1px);
  box-shadow: 0 8px 16px rgba(32, 65, 55, 0.14);
}

.primary:disabled {
  cursor: not-allowed;
  opacity: 0.4;
  background: linear-gradient(135deg, rgba(32, 65, 55, 0.15), rgba(32, 65, 55, 0.08));
  box-shadow: none;
  transform: none;
}

.drop-zone p {
  margin: 0;
  font-size: clamp(1.05rem, 2.8vw, 1.28rem);
  color: var(--text-secondary);
  letter-spacing: 0.03em;
}

.control-actions {
  background: var(--bg-base);
  border: 1px solid rgba(32, 65, 55, 0.12);
  border-radius: calc(var(--radius-lg) - 10px);
  padding: 0.9rem 1.1rem;
  box-shadow: 0 8px 16px rgba(32, 65, 55, 0.08);
  display: grid;
  gap: 0.75rem;
}

.file-status {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.button-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.button-row .primary {
  flex: 1 1 180px;
  text-align: center;
}

.drop-zone:hover,
.drop-zone.dragover {
  transform: translateY(-2px);
  border-color: rgba(254, 83, 31, 0.7);
  box-shadow: 0 20px 36px rgba(32, 65, 55, 0.18);
}

.information {
  display: flex;
  flex-direction: column;
  gap: clamp(1rem, 2.5vw, 1.75rem);
}

.options-row {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(220px, 1fr);
  gap: clamp(1rem, 2vw, 1.5rem);
  align-items: stretch;
}

.options-row > div,
.options-row > p,
.options-row > fieldset,
.options-row > .volume-slider {
  height: 100%;
}

.options-row .volume-slider {
  grid-auto-columns: 160px;
  min-width: 140px;
  padding-inline: 0.5rem;
}

.panel {
  background: var(--surface-light);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: clamp(1.25rem, 3vw, 2rem);
}

.items {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: clamp(1rem, 2.5vw, 1.5rem);
}

.items > div {
  background: var(--bg-base);
  border: 1px solid rgba(32, 65, 55, 0.12);
  border-radius: calc(var(--radius-lg) - 10px);
  padding: 1rem 1.1rem;
  display: grid;
  gap: 0.75rem;
  box-shadow: 0 6px 12px rgba(32, 65, 55, 0.08);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.items > div:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 18px rgba(32, 65, 55, 0.12);
}

.items p {
  margin: 0;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

label {
  white-space: normal;
}

.items label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-primary);
}

input[type="radio"],
input[type="checkbox"],
input[type="range"],
input[type="number"] {
  accent-color: var(--accent);
}

input[type="radio"],
input[type="checkbox"] {
  width: 1.05rem;
  height: 1.05rem;
}

summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  cursor: pointer;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary b {
  font-family: 'Montserrat', sans-serif;
  letter-spacing: 0.08em;
  font-size: 1.1rem;
  color: var(--text-primary);
}

details > p {
  margin-top: 1rem;
  color: var(--text-secondary);
}

fieldset {
  border: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

fieldset:disabled {
  opacity: 0.5;
  filter: saturate(0.75);
}

.volume-slider {
  text-align: center;
  display: grid;
  gap: 0.75rem;
  justify-items: center;
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.25rem;
  align-items: stretch;
}

.grid-container > div {
  background: var(--bg-base);
  border: 1px solid rgba(32, 65, 55, 0.12);
  border-radius: calc(var(--radius-lg) - 10px);
  padding: 1rem 1.1rem;
  display: grid;
  gap: 0.75rem;
  box-shadow: 0 6px 12px rgba(32, 65, 55, 0.08);
}

.grid-container label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.85rem;
}

.price-output {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  font-weight: 600;
}

input[type="range"] {
  appearance: none;
  width: 100%;
  height: 5px;
  border-radius: 999px;
  background: rgba(32, 65, 55, 0.25);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid rgba(32, 65, 55, 0.2);
  box-shadow: 0 0 0 4px rgba(254, 83, 31, 0.2);
  transition: transform 0.2s ease, background 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(32, 65, 55, 0.2);
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(254, 83, 31, 0.2);
  transition: transform 0.2s ease;
}

input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.1);
}

input[type=range][orient=vertical] {
  appearance: slider-vertical;
  width: auto;
  height: 12em;
  margin: 0 auto;
}

input[type="number"] {
  width: 100%;
  border-radius: 12px;
  border: 1px solid rgba(32, 65, 55, 0.2);
  background: rgba(32, 65, 55, 0.08);
  color: var(--text-primary);
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
}

.manual-bpm input {
  width: 100%;
  border-radius: 12px;
  border: 1px solid rgba(32, 65, 55, 0.18);
  background: rgba(32, 65, 55, 0.04);
  color: var(--text-primary);
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
}

.manual-bpm .input-hint {
  margin: 0.35rem 0 0;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.download-options {
  display: grid;
  gap: 0.75rem;
}

input[type="number"]:focus,
.manual-bpm input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(254, 83, 31, 0.2);
}

input[role="switch"] {
  position: relative;
  height: 1.6rem;
  width: 3.2rem;
  border-radius: 999px;
  border: 1px solid rgba(32, 65, 55, 0.2);
  background: rgba(32, 65, 55, 0.08);
  appearance: none;
  transition: background 0.2s ease, border 0.2s ease;
}

input[role="switch"]::after {
  content: "";
  position: absolute;
  inset: 0.2rem;
  width: 1.2rem;
  height: 1.2rem;
  border-radius: 50%;
  background: var(--text-secondary);
  transform: translateX(0);
  transition: transform 0.2s ease, background 0.2s ease;
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.25);
}

input[role="switch"]:checked {
  border-color: rgba(254, 83, 31, 0.6);
  background: var(--accent);
}

input[role="switch"]:checked::after {
  background: var(--bg-base);
  transform: translateX(1.6rem);
}

.narrative {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.25rem);
}

.narrative .section {
  background: var(--bg-base);
  border: 1px solid var(--border-soft);
  border-radius: calc(var(--radius-lg) - 8px);
  padding: 1.25rem 1.5rem;
  box-shadow: 0 10px 20px rgba(32, 65, 55, 0.12);
}

.narrative h2 {
  margin: 0 0 0.75rem;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.narrative p {
  margin: 0;
  color: var(--text-secondary);
}

a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

a:hover {
  color: rgba(254, 83, 31, 0.8);
}

.footer {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding-bottom: 2rem;
}

.footer a {
  color: var(--accent);
}

.footer a:hover {
  color: rgba(254, 83, 31, 0.8);
}

.darkmode-layer,
.darkmode-toggle {
  z-index: 500;
}

@media (max-width: 920px) {
  summary {
    flex-direction: column;
    align-items: flex-start;
  }

  input[role="switch"] {
    align-self: flex-start;
  }
}

@media (max-width: 780px) {
  .options-row {
    grid-auto-flow: row;
    grid-auto-columns: unset;
    grid-template-columns: none;
  }

  .panel {
    padding: 1.25rem;
  }

  .items {
    grid-template-columns: 1fr;
  }

  .drop-zone {
    padding: 1.5rem;
  }
}