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

:root {
  --bg: #050816;
  --bg-elevated: #0b1020;
  --accent: #6366f1;
  --accent-soft: rgba(99, 102, 241, 0.1);
  --danger: #ef4444;
  --text: #f9fafb;
  --muted: #9ca3af;
  --border-subtle: #1f2937;
  --radius-lg: 16px;
  --radius-md: 10px;
  --shadow-soft: 0 18px 30px rgba(15, 23, 42, 0.8);
  --transition-fast: 0.16s ease-out;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: stretch;
  padding: 24px 16px;
  background: radial-gradient(circle at top, #1d2538 0, #020617 45%, #000 100%);
  color: var(--text);
  font-family: var(--font-sans);
}

.app {
  width: 100%;
  max-width: 720px;
  margin: auto;
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.96), rgba(3, 7, 18, 0.98));
  border-radius: 28px;
  padding: 24px 20px 18px;
  border: 1px solid rgba(148, 163, 184, 0.2);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(18px);
}

.header {
  text-align: center;
  margin-bottom: 20px;
}

.title {
  font-size: 1.7rem;
  letter-spacing: 0.02em;
  margin-bottom: 6px;
}

.subtitle {
  font-size: 0.95rem;
  color: var(--muted);
}

.main {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card {
  background: radial-gradient(circle at top left, rgba(79, 70, 229, 0.14), rgba(15, 23, 42, 0.95));
  border-radius: var(--radius-lg);
  padding: 16px 16px 14px;
  border: 1px solid rgba(148, 163, 184, 0.22);
}

.card-title {
  font-size: 1.1rem;
  margin-bottom: 6px;
}

.card-text {
  font-size: 0.92rem;
  color: var(--muted);
}

.hidden {
  display: none;
}

.file-input-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent), #22c55e);
  color: #f9fafb;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 14px 24px rgba(79, 70, 229, 0.35);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

.file-input-label:hover {
  transform: translateY(-1px);
  filter: brightness(1.04);
  box-shadow: 0 18px 28px rgba(79, 70, 229, 0.45);
}

.file-input-label:active {
  transform: translateY(0);
  box-shadow: 0 10px 18px rgba(79, 70, 229, 0.3);
}

.file-input-label input {
  display: none;
}

.file-name {
  margin-top: 8px;
  font-size: 0.85rem;
}

.upload-progress {
  margin-top: 12px;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(148, 163, 184, 0.25);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #22c55e);
  border-radius: 999px;
  transition: width 0.2s ease-out;
  width: 0%;
}

.progress-text {
  margin-top: 6px;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
}

.audio-wrapper {
  margin-top: 12px;
  padding: 12px 12px 10px;
  border-radius: 14px;
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.18), rgba(15, 23, 42, 0.96));
  border: 1px solid rgba(148, 163, 184, 0.25);
}

.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.time {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  font-size: 0.82rem;
  color: var(--muted);
}

#seek {
  margin-top: 8px;
  width: 100%;
  cursor: pointer;
  appearance: none;
  height: 4px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.35);
  outline: none;
}

#seek::-webkit-slider-thumb {
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.3);
}

#seek::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  border: none;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.3);
}

.volume-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
}

.btn-icon {
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(129, 140, 248, 0.4);
  border-radius: 8px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-icon:hover {
  background: rgba(99, 102, 241, 0.25);
  transform: scale(1.05);
}

.btn-icon:active {
  transform: scale(0.95);
}

#volume {
  flex: 1;
  cursor: pointer;
  appearance: none;
  height: 4px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.35);
  outline: none;
}

#volume::-webkit-slider-thumb {
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.3);
}

#volume::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  border: none;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.3);
}

.share-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
}

.share-input {
  flex: 1;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: rgba(15, 23, 42, 0.9);
  color: var(--text);
  font-size: 0.85rem;
  outline: none;
}

.share-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(99, 102, 241, 0.5);
}

.actions-row {
  display: flex;
  justify-content: flex-end;
  margin-top: 10px;
}

.btn {
  border: none;
  border-radius: var(--radius-md);
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
}

.btn:disabled {
  opacity: 0.5;
  cursor: default;
  box-shadow: none;
}

.btn.primary {
  background: var(--accent);
  color: #f9fafb;
  box-shadow: 0 12px 22px rgba(79, 70, 229, 0.35);
}

.btn.primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 16px 26px rgba(79, 70, 229, 0.45);
}

.btn.secondary {
  background: var(--accent-soft);
  color: var(--text);
  border: 1px solid rgba(129, 140, 248, 0.6);
}

.btn.secondary:hover:not(:disabled) {
  background: rgba(129, 140, 248, 0.3);
}

.btn.danger {
  background: rgba(239, 68, 68, 0.12);
  color: #fecaca;
  border: 1px solid rgba(248, 113, 113, 0.7);
}

.btn.danger:hover:not(:disabled) {
  background: rgba(239, 68, 68, 0.22);
}

.status {
  margin-top: 8px;
  font-size: 0.82rem;
}

.footer {
  margin-top: 18px;
  font-size: 0.8rem;
  text-align: center;
}

.muted {
  color: var(--muted);
}

.divider {
  opacity: 0.6;
}

@media (min-width: 640px) {
  .app {
    padding: 26px 24px 20px;
  }

  .title {
    font-size: 1.9rem;
  }

  .card {
    padding: 18px 18px 14px;
  }
}

@media (max-width: 480px) {
  body {
    padding: 16px 10px;
  }

  .share-row {
    flex-direction: column;
    align-items: stretch;
  }

  .actions-row {
    justify-content: stretch;
  }

  .actions-row .btn {
    width: 100%;
  }
}