/* ============================================================
   Audio Trimmer — page layout & component styles
   ============================================================ */

.at-page {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}

/* Title block */
.at-title-block {
  padding-top: 2.5rem;
  margin-bottom: 2rem;
}
.at-title-block h1 {
  font-size: clamp(1.75rem, 1rem + 3vw, 2.5rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: var(--text-primary);
}
.at-title-block p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 0;
}

/* Dropzone */
.at-dropzone {
  width: 100%;
  border: 2px dashed var(--border-color);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  cursor: pointer;
  padding: 2.5rem 1.5rem;
  transition: border-color var(--transition), background var(--transition);
  margin-bottom: 1.5rem;
}
.at-dropzone:hover,
.at-dropzone:focus-visible,
.at-dropzone.is-dragover {
  border-color: var(--accent);
  background: var(--accent-light);
  outline: none;
}
.at-dropzone-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}
.at-dropzone-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 0.25rem;
}
.at-dropzone-hint {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin: 0 0 1rem;
}
.at-browse-btn {
  padding: 0.5rem 1.25rem;
  border: 1.5px solid var(--accent);
  color: var(--accent);
  background: transparent;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.at-browse-btn:hover {
  background: var(--accent);
  color: #fff;
}

/* Loading */
.at-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 2rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}
.at-loading[hidden] { display: none; }
.at-spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: at-spin 0.7s linear infinite;
}
@keyframes at-spin { to { transform: rotate(360deg); } }

/* Error */
.at-error {
  padding: 0.75rem 1rem;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 8px;
  color: #dc2626;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
.at-error[hidden] { display: none; }

/* Tool panel */
.at-panel[hidden] { display: none; }
.at-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.25rem;
  margin-bottom: 2rem;
}

/* Info bar */
.at-info-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1rem;
}
.at-info-file {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 55%;
}
.at-info-duration {
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* Waveform canvas */
.at-canvas-wrap {
  width: 100%;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  cursor: crosshair;
  margin-bottom: 0.5rem;
  position: relative;
}
.at-canvas {
  display: block;
  width: 100%;
  height: 120px;
}

/* Dual range sliders */
.at-sliders-wrap {
  position: relative;
  height: 28px;
  margin-bottom: 1rem;
}
.at-range {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  pointer-events: none;
  height: 4px;
}
.at-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.25);
  cursor: pointer;
  pointer-events: all;
  transition: transform var(--transition);
}
.at-range::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.25);
  cursor: pointer;
  pointer-events: all;
}
.at-range::-webkit-slider-thumb:hover { transform: scale(1.2); }
.at-range::-moz-range-thumb:hover { transform: scale(1.2); }
.at-range-start::-webkit-slider-thumb { background: var(--accent); }
.at-range-end::-webkit-slider-thumb { background: var(--accent); }

/* Time inputs row */
.at-time-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}
.at-time-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  min-width: 90px;
}
.at-time-group--sel {
  flex: 1;
}
.at-time-group--end {
  align-items: flex-end;
}
.at-time-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.at-time-input {
  width: 90px;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
  text-align: center;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.at-time-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.at-sel-dur {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
}

/* Action buttons */
.at-btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  align-items: center;
}
.at-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  height: 40px;
  padding: 0 1.125rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), box-shadow var(--transition);
}
.at-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.at-btn--primary {
  background: var(--accent);
  color: #fff;
  border: 1.5px solid var(--accent);
}
.at-btn--primary:hover { background: #1d4ed8; border-color: #1d4ed8; }
.at-btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border-color);
}
.at-btn--ghost:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }
.at-btn:disabled { opacity: 0.45; cursor: not-allowed; }

/* Status line */
.at-status {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}
.at-status[hidden] { display: none; }
.at-status--ok { color: #16a34a; }
.at-status--err { color: #dc2626; }

/* How It Works */
.at-how-section {
  margin-bottom: 2.5rem;
}
.at-how-section h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 1rem;
  color: var(--text-primary);
}
.at-how-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.at-how-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.25rem;
}
.at-how-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.at-how-card strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}
.at-how-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.55;
}

/* FAQ */
.at-faq-section {
  margin-bottom: 3rem;
}
.at-faq-section h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 0.25rem;
  color: var(--text-primary);
}

/* Responsive */
@media (max-width: 540px) {
  .at-how-grid { grid-template-columns: 1fr; }
  .at-btn-row { flex-direction: column; }
  .at-btn { width: 100%; }
  .at-time-row { flex-direction: column; align-items: stretch; }
  .at-time-group { align-items: flex-start; }
  .at-time-group--end { align-items: flex-start; }
  .at-time-input { width: 100%; }
  .at-info-file { max-width: 100%; }
}