/* ================================================================
   Merge PDF — styles/merge-pdf.css
   Design System: PAPIC OS / Stacks (base.css variables)
   ================================================================ */

/* --- Page Shell --- */
.mg-page {
  background-color: var(--color-bg-primary);
  max-width: 100%;
  overflow-x: hidden;
}

/* --- Main Layout --- */

.mg-main {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: var(--space-2);
  padding-right: var(--space-2);
  padding-bottom: var(--space-7);
  box-sizing: border-box;
}

@media (min-width: 640px) {
  .mg-main {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
}

@media (min-width: 1024px) {
  .mg-main {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

/* --- Hero --- */

.mg-hero {
  padding-top: var(--space-5);
  padding-bottom: var(--space-5);
  text-align: center;
}

.mg-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-purple-2);
  background: rgba(122, 64, 238, 0.08);
  border: 1px solid rgba(122, 64, 238, 0.18);
  border-radius: var(--radius-xl);
  padding: 6px 14px;
  margin-bottom: var(--space-3);
  justify-content: center;
}

.mg-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-circle);
  background: var(--color-primary);
  display: inline-block;
  animation: mg-pulse 2s ease-in-out infinite;
}

@keyframes mg-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.mg-title {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-primary-dark);
  margin-bottom: var(--space-2);
  font-family: var(--font-family-display);
}

@media (max-width: 639px) {
  .mg-title {
    font-size: 36px;
  }
}

.mg-desc {
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto var(--space-3);
}

/* --- Workspace Card --- */

.mg-workspace {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 920px;
  margin: 0 auto var(--space-5);
  min-width: 0;
  width: 100%;
}

.mg-card {
  background: var(--color-white);
  border: 1px solid var(--color-border-muted);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  min-height: 276px;
  box-shadow: var(--shadow-raised);
  transition: box-shadow var(--transition-default);
  box-sizing: border-box;
  width: 100%;
  min-width: 0;
}

/* --- Upload Zone --- */

.mg-upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 56px var(--space-3);
  border: 2px dashed var(--color-border-muted);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: center;
  box-sizing: border-box;
}

@media (max-width: 639px) {
  .mg-upload-zone {
    padding: 32px 16px;
  }
}

.mg-upload-zone:hover {
  border-color: var(--color-primary);
  background: rgba(252, 100, 50, 0.03);
}

.mg-upload-zone:focus-visible {
  outline: 3px solid rgba(252, 100, 50, 0.28);
  outline-offset: 4px;
  border-color: var(--color-primary);
}

.mg-upload-zone.is-dragover {
  border-style: solid;
  border-color: var(--color-primary);
  background: rgba(252, 100, 50, 0.06);
  transform: scale(1.01);
}

.mg-upload-zone[hidden] { display: none; }

.mg-upload-icon {
  font-size: 48px;
  color: var(--color-primary);
  margin-bottom: var(--space-1);
  transition: transform 0.3s ease;
}

.mg-upload-zone:hover .mg-upload-icon { transform: translateY(-4px); }
.mg-upload-zone.is-dragover .mg-upload-icon { transform: translateY(-8px) scale(1.1); }

.mg-upload-text {
  font-family: var(--font-family-display);
  font-size: 16px;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.mg-upload-hint {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.mg-upload-formats {
  display: flex;
  justify-content: center;
  margin-top: var(--space-1);
}

.mg-format-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: var(--font-weight-medium);
  color: #c0392b;
  background: rgba(192, 57, 43, 0.08);
  border-radius: var(--radius-lg);
}

/* --- File Panel --- */

.mg-file-panel[hidden] { display: none; }

.mg-file-panel {
  animation: mg-slideIn 0.3s ease;
  min-width: 0;
  width: 100%;
}

.mg-file-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.mg-file-panel__title {
  color: var(--color-text-primary);
  font-family: var(--font-family-display);
  font-size: 16px;
  font-weight: var(--font-weight-bold);
  margin-bottom: 2px;
}

.mg-file-panel__hint {
  color: var(--color-text-secondary);
  font-size: 13px;
  line-height: 1.5;
}

@keyframes mg-slideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* --- File List --- */

.mg-file-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: var(--space-2);
  min-width: 0;
}

.mg-file-feedback {
  display: flex;
  align-items: center;
  padding: 10px 14px;
  margin-bottom: var(--space-2);
  border: 1px solid rgba(192, 57, 43, 0.2);
  border-radius: var(--radius-md);
  color: #9f2e22;
  background: rgba(192, 57, 43, 0.06);
  font-size: 14px;
  line-height: 1.5;
}

.mg-file-feedback[hidden] { display: none; }

/* --- File Item --- */

.mg-file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--color-bg-lighter);
  border: 1px solid var(--color-border-muted);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  cursor: default;
  user-select: none;
  min-width: 0;
  box-sizing: border-box;
}

.mg-file-item:hover {
  border-color: var(--color-neutral-medium);
  box-shadow: var(--shadow-raised);
}

.mg-file-item.is-dragging {
  opacity: 0.4;
  border-style: dashed;
}

.mg-file-item.drag-over {
  border-color: var(--color-primary);
  background: rgba(252, 100, 50, 0.04);
  transform: translateY(-2px);
  box-shadow: var(--shadow-floating);
}

/* Drag Handle */
.mg-drag-handle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 32px;
  color: var(--color-neutral-medium);
  cursor: grab;
  flex-shrink: 0;
  font-size: 14px;
  border-radius: 4px;
  transition: color 0.2s ease;
}

.mg-drag-handle:hover { color: var(--color-text-primary); }
.mg-drag-handle:active { cursor: grabbing; }

/* Order Badge */
.mg-file-order {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-circle);
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 11px;
  font-weight: var(--font-weight-bold);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* PDF Icon */
.mg-file-pdf-icon {
  font-size: 20px;
  color: #c0392b;
  flex-shrink: 0;
}

/* File Details */
.mg-file-details {
  flex: 1;
  min-width: 0;
}

.mg-file-name {
  font-size: 14px;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mg-file-size {
  font-size: 12px;
  color: var(--color-text-secondary);
}

/* Mobile up/down buttons */
.mg-reorder-btns {
  display: none;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.mg-reorder-btn {
  width: 24px;
  height: 22px;
  border-radius: 4px;
  font-size: 10px;
  color: var(--color-text-secondary);
  background: var(--color-bg-neutral);
  border: 1px solid var(--color-border-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.mg-reorder-btn:hover {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.mg-reorder-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* Remove button */
.mg-file-remove {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-circle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  flex-shrink: 0;
}

.mg-file-remove:hover {
  background: rgba(192, 57, 43, 0.08);
  color: #c0392b;
}

/* --- Min Warning --- */

.mg-min-warning {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(247, 183, 15, 0.08);
  border: 1px solid rgba(247, 183, 15, 0.3);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--color-warning-secondary);
  margin-bottom: var(--space-2);
  box-sizing: border-box;
  width: 100%;
}

.mg-min-warning[hidden] { display: none; }

/* --- Add More & Total Info --- */

.mg-add-more-wrap {
  margin-bottom: var(--space-2);
  width: 100%;
}

.mg-total-info {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  padding: 0 2px;
}

/* --- Action Area --- */

.mg-action-area {
  display: flex;
  justify-content: center;
  width: 100%;
}

/* --- Shared Buttons --- */

.mg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: var(--font-family-body);
  font-size: 14px;
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-xl);
  border: none;
  cursor: pointer;
  height: 48px;
  transition: all 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
  box-sizing: border-box;
}

@media (max-width: 639px) {
  .mg-btn {
    width: 100%;
  }
}

.mg-btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.mg-btn--primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(252, 100, 50, 0.3);
}

.mg-btn--primary:active:not(:disabled) {
  background: var(--color-primary-active);
  transform: translateY(0);
}

.mg-btn--primary:disabled {
  background: #D9D9D9;
  color: #999;
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.mg-btn--secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-border-muted);
  border-radius: var(--radius-md);
}

.mg-btn--secondary:hover { background: var(--color-bg-primary); }

.mg-btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px dashed var(--color-primary);
  border-radius: var(--radius-md);
  height: 40px;
  font-size: 14px;
}

.mg-btn--ghost:hover {
  background: rgba(252, 100, 50, 0.05);
}

.mg-btn--quiet {
  height: 40px;
  padding: 8px 14px;
  color: var(--color-text-secondary);
  background: transparent;
  font-size: 13px;
}

.mg-btn--quiet:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-neutral);
}

.mg-btn:focus-visible,
.mg-file-remove:focus-visible,
.mg-reorder-btn:focus-visible {
  outline: 3px solid rgba(252, 100, 50, 0.28);
  outline-offset: 3px;
}

/* --- Progress --- */

.mg-progress {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-2);
  animation: mg-slideIn 0.3s ease;
  width: 100%;
  box-sizing: border-box;
}

.mg-progress[hidden] { display: none; }

.mg-progress__spinner { font-size: 36px; color: var(--color-primary); }

.mg-progress__status {
  font-family: var(--font-family-display);
  font-size: 16px;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.mg-progress__bar-container {
  width: 100%;
  max-width: 400px;
  height: 6px;
  background: var(--color-bg-neutral);
  border-radius: 3px;
  overflow: hidden;
}

.mg-progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover));
  border-radius: 3px;
  transition: width 0.5s ease;
  position: relative;
}

.mg-progress__bar.is-indeterminate {
  width: 42%;
  animation: mg-progress-indeterminate 1.35s ease-in-out infinite;
}

@keyframes mg-progress-indeterminate {
  0% { transform: translateX(-120%); }
  100% { transform: translateX(340%); }
}

.mg-progress__bar::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: mg-shimmer 1.5s infinite;
}

@keyframes mg-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.mg-progress__detail {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* --- Result --- */

.mg-result {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-2);
  animation: mg-slideIn 0.3s ease;
  box-sizing: border-box;
  width: 100%;
}

.mg-result[hidden] { display: none; }

.mg-result__icon {
  font-size: 48px;
  color: var(--color-success);
  animation: mg-bounceIn 0.5s ease;
}

@keyframes mg-bounceIn {
  0% { opacity: 0; transform: scale(0.5); }
  60% { transform: scale(1.15); }
  100% { opacity: 1; transform: scale(1); }
}

.mg-result__info { text-align: center; }

.mg-result__title {
  font-family: var(--font-family-display);
  font-size: 16px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: 4px;
}

.mg-result__subtitle {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 2px;
}

.mg-result__filename {
  font-size: 14px;
  color: var(--color-neutral-medium);
}

.mg-result__actions {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
  justify-content: center;
  margin-top: var(--space-1);
  width: 100%;
}

/* --- Error --- */

.mg-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-2);
  animation: mg-slideIn 0.3s ease;
  box-sizing: border-box;
  width: 100%;
}

.mg-error[hidden] { display: none; }

.mg-error__icon { font-size: 40px; color: var(--color-warning-primary); }

.mg-error__message {
  font-size: 14px;
  color: var(--color-text-secondary);
  text-align: center;
  max-width: 400px;
  line-height: 1.6;
}

.mg-error__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-1);
}

/* --- Info Grid --- */

.mg-info-section { 
  margin-bottom: var(--space-7); 
  width: 100%;
}

.mg-info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
}

@media (max-width: 1024px) {
  .mg-info-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 639px) {
  .mg-info-grid { grid-template-columns: 1fr; }
}

.mg-info-card {
  background: var(--color-white);
  border: 1px solid var(--color-border-muted);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  box-shadow: var(--shadow-raised);
  text-align: center;
  transition: all 0.25s ease;
}

.mg-info-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-floating);
}

.mg-info-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin: 0 auto var(--space-2);
}

.mg-info-card__icon--order { background: rgba(252, 100, 50, 0.08); color: var(--color-primary); }
.mg-info-card__icon--security { background: rgba(85, 70, 255, 0.08); color: var(--color-accent-purple-1); }
.mg-info-card__icon--speed { background: rgba(22, 163, 74, 0.08); color: var(--color-success); }

.mg-info-card__title {
  font-family: var(--font-family-display);
  font-size: 16px;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.mg-info-card__desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

.mg-inline-link {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.mg-inline-link:hover {
  color: var(--color-primary-hover);
}

/* ================================================================
   Responsive Overrides
   ================================================================ */

@media (max-width: 639px) {
  /* Hide drag handle, show up/down buttons on mobile */
  .mg-drag-handle { display: none; }
  .mg-file-item {
    gap: 6px;
    padding: 9px 8px;
  }
  .mg-file-pdf-icon { display: none; }
  .mg-reorder-btns {
    display: flex;
    gap: 3px;
  }
  .mg-reorder-btn {
    width: 30px;
    height: 24px;
  }
  .mg-file-remove {
    width: 32px;
    height: 32px;
  }
  .mg-error__actions {
    width: 100%;
  }
}

@media (min-width: 640px) and (max-width: 1024px) {
  .mg-info-card:last-child {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .mg-page *,
  .mg-page *::before,
  .mg-page *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}