/* ── AMBIENT BACKGROUND ── */
.pdm-ambient {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  pointer-events: none; z-index: 0; overflow: hidden;
}
.pdm-ambient::before {
  content: '';
  position: absolute; top: -20%; left: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(34,197,94,0.07) 0%, transparent 70%);
  border-radius: 50%;
  animation: pdmDrift1 20s ease-in-out infinite alternate;
}
.pdm-ambient::after {
  content: '';
  position: absolute; bottom: -20%; right: -10%;
  width: 700px; height: 700px;
  background: radial-gradient(circle, rgba(234,179,8,0.05) 0%, transparent 70%);
  border-radius: 50%;
  animation: pdmDrift2 25s ease-in-out infinite alternate;
}
@keyframes pdmDrift1 { from { transform: translate(0,0); } to { transform: translate(60px,80px); } }
@keyframes pdmDrift2 { from { transform: translate(0,0); } to { transform: translate(-80px,-60px); } }

/* ── MAIN CONTAINER ── */
.pdm-wrap {
  position: relative; z-index: 1;
  max-width: 820px; margin: 0 auto;
  padding: 120px 1.5rem 5rem;
}

/* ── HERO SECTION ── */
.pdm-hero { margin-bottom: 2.5rem; text-align: center; }

.pdm-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  font-weight: 900; text-transform: uppercase;
  letter-spacing: -0.02em; line-height: 1;
  color: var(--on-surface); margin-bottom: 1rem;
}

.pdm-gradient {
  background: linear-gradient(135deg, #22c55e, #84cc16);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.pdm-desc {
  font-size: 1.1rem; line-height: 1.6;
  color: var(--on-surface-variant);
  max-width: 600px; margin: 0 auto;
}

/* ── TOOL CARD ── */
.pdm-card {
  background: var(--surface-variant);
  border: 1px solid var(--outline);
  border-radius: 1rem;
  padding: 2rem;
  margin-bottom: 2rem;
  backdrop-filter: blur(10px);
}

/* ── FILE INPUT ── */
.pdm-file-input-wrapper {
  position: relative;
  margin-bottom: 2rem;
}

.pdm-file-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 3rem;
  border: 2px dashed var(--outline);
  border-radius: 0.75rem;
  background: var(--surface);
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--on-surface-variant);
  font-weight: 500;
}

.pdm-file-label:hover {
  border-color: var(--primary);
  background: var(--surface-variant);
  color: var(--on-surface);
}

.pdm-file-label.drag-over {
  border-color: var(--primary);
  background: rgba(34, 197, 94, 0.1);
}

.pdm-file-icon {
  font-size: 2rem;
  color: var(--primary);
}

#pdm-file-input {
  display: none;
}

/* ── PREVIEW LIST ── */
.pdm-preview-container {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--outline);
}

.pdm-preview-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.pdm-preview-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: 0.5rem;
  font-size: 0.95rem;
}

.pdm-preview-name {
  flex: 1;
  font-weight: 500;
  color: var(--on-surface);
  word-break: break-word;
}

.pdm-preview-size {
  margin: 0 1rem;
  color: var(--on-surface-variant);
  font-size: 0.9rem;
  min-width: 60px;
  text-align: right;
}

.pdm-preview-remove {
  background: none;
  border: none;
  color: var(--error);
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.3s;
}

.pdm-preview-remove:hover {
  color: var(--error-bright);
}

.pdm-size-info {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border-radius: 0.5rem;
  font-weight: 500;
  color: var(--on-surface);
}

.pdm-size-warning {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  margin-top: 1rem;
  padding: 1rem;
  background: rgba(234, 179, 8, 0.1);
  border-left: 3px solid #eab308;
  border-radius: 0.5rem;
  color: var(--on-surface-variant);
  font-size: 0.9rem;
}

.pdm-size-warning .material-symbols-outlined {
  color: #eab308;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

/* ── BUTTONS ── */
.pdm-merge-btn {
  width: 100%;
  padding: 1rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.3s ease;
  margin-bottom: 1rem;
}

.pdm-merge-btn:hover:not(:disabled) {
  background: #16a34a;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

.pdm-merge-btn:disabled {
  background: var(--outline);
  cursor: not-allowed;
  opacity: 0.5;
}

.pdm-merge-btn.merging {
  pointer-events: none;
}

.pdm-action-btn {
  flex: 1;
  padding: 0.875rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.3s ease;
}

.pdm-action-btn:hover {
  background: #16a34a;
  transform: translateY(-2px);
}

.pdm-action-btn:active {
  transform: translateY(0);
}

/* ── STATUS MESSAGES ── */
.pdm-status {
  padding: 1rem;
  margin-bottom: 1rem;
  border-radius: 0.5rem;
  font-size: 0.95rem;
  display: none;
}

.pdm-status.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  border-left: 3px solid #ef4444;
  color: #dc2626;
}

.pdm-status.success {
  display: block;
  background: rgba(34, 197, 94, 0.1);
  border-left: 3px solid #22c55e;
  color: #16a34a;
}

.pdm-status.loading {
  display: block;
  background: rgba(59, 130, 246, 0.1);
  border-left: 3px solid #3b82f6;
  color: #1d4ed8;
}

/* ── OUTPUT SECTION ── */
.pdm-output-section {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: 0.75rem;
}

.pdm-output-header {
  margin-bottom: 1.5rem;
}

.pdm-success-message {
  color: var(--on-surface);
  font-weight: 500;
  margin: 0;
}

.pdm-output-actions {
  display: flex;
  gap: 1rem;
}

@media (max-width: 640px) {
  .pdm-wrap { padding: 80px 1rem 3rem; }
  .pdm-title { font-size: clamp(1.8rem, 5vw, 2.5rem); }
  .pdm-card { padding: 1.5rem; }
  .pdm-file-label { padding: 2rem; }
  .pdm-output-actions { flex-direction: column; }
  .pdm-action-btn { width: 100%; }
}