/* ======================================
   Modal Base
   ====================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5000;
  animation: modalOverlayIn 0.2s ease;
}

@keyframes modalOverlayIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-overlay.closing {
  animation: modalOverlayOut 0.15s ease forwards;
}

@keyframes modalOverlayOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

.modal {
  background: var(--bg-glass);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  animation: modalIn 0.25s ease-out;
  overflow: hidden;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal.closing {
  animation: modalOut 0.15s ease-in forwards;
}

@keyframes modalOut {
  from { opacity: 1; transform: scale(1) translateY(0); }
  to { opacity: 0; transform: scale(0.95) translateY(10px); }
}

.modal-sm { max-width: 400px; }
.modal-md { max-width: 520px; }
.modal-lg { max-width: 680px; }
.modal-xl { max-width: 800px; }

/* Modal Header */
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--border-primary);
  flex-shrink: 0;
}

.modal-title {
  font-size: var(--font-lg);
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.modal-title svg {
  width: 20px;
  height: 20px;
  color: var(--accent);
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: none;
  border: none;
}

.modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.modal-close svg {
  width: 18px;
  height: 18px;
}

/* Modal Body */
.modal-body {
  padding: var(--space-6);
  overflow-y: auto;
  flex: 1;
}

/* Modal Footer */
.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--border-primary);
  flex-shrink: 0;
}

/* ======================================
   Signature Modal
   ====================================== */
.signature-tabs {
  display: flex;
  gap: 2px;
  margin-bottom: var(--space-5);
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 3px;
}

.signature-tab {
  flex: 1;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--font-sm);
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  background: none;
}

.signature-tab:hover {
  color: var(--text-primary);
}

.signature-tab.active {
  background: var(--bg-secondary);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.signature-panel {
  display: none;
}

.signature-panel.active {
  display: block;
}

/* Draw tab */
.signature-pad-wrapper {
  background: white;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-secondary);
  margin-bottom: var(--space-3);
}

#signature-pad {
  width: 100%;
  height: 200px;
  display: block;
}

.signature-pad-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
}

/* Type tab */
.signature-type-input {
  width: 100%;
  padding: var(--space-4);
  font-size: var(--font-2xl);
  text-align: center;
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-md);
  background: white;
  color: #1a202c;
  margin-bottom: var(--space-3);
}

.signature-font-options {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.signature-font-btn {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-secondary);
  background: var(--bg-tertiary);
  cursor: pointer;
  font-size: var(--font-lg);
  color: var(--text-primary);
  transition: all var(--transition);
}

.signature-font-btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.signature-font-btn.active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

/* Upload tab */
.signature-upload-area {
  border: 2px dashed var(--border-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
}

.signature-upload-area:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.signature-upload-area svg {
  width: 32px;
  height: 32px;
  color: var(--text-muted);
  margin: 0 auto var(--space-3);
}

.signature-preview {
  max-width: 100%;
  max-height: 150px;
  margin: var(--space-3) auto;
  display: block;
  border-radius: var(--radius-sm);
}

/* ======================================
   Watermark Modal
   ====================================== */
.watermark-preview {
  width: 100%;
  height: 180px;
  background: white;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  position: relative;
  overflow: hidden;
}

.watermark-preview-text {
  font-size: 28px;
  font-weight: 700;
  color: rgba(0, 0, 0, 0.15);
  transform: rotate(-30deg);
  white-space: nowrap;
  user-select: none;
}

.watermark-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.watermark-form .form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.watermark-form .form-group.full-width {
  grid-column: 1 / -1;
}

/* ======================================
   Merge Modal
   ====================================== */
.merge-file-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  max-height: 300px;
  overflow-y: auto;
}

.merge-file-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-primary);
  transition: all var(--transition);
}

.merge-file-item:hover {
  border-color: var(--border-secondary);
}

.merge-file-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
  color: var(--accent);
  flex-shrink: 0;
}

.merge-file-icon svg {
  width: 18px;
  height: 18px;
}

.merge-file-info {
  flex: 1;
  min-width: 0;
}

.merge-file-name {
  font-size: var(--font-sm);
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.merge-file-size {
  font-size: var(--font-xs);
  color: var(--text-muted);
}

.merge-file-actions {
  display: flex;
  gap: 2px;
}

.merge-add-btn {
  width: 100%;
  padding: var(--space-3);
  border: 2px dashed var(--border-secondary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--font-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
  background: none;
}

.merge-add-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.merge-add-btn svg {
  width: 16px;
  height: 16px;
}

/* ======================================
   Split Modal
   ====================================== */
.split-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.split-option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 2px solid var(--border-primary);
  cursor: pointer;
  transition: all var(--transition);
}

.split-option:hover {
  border-color: var(--border-secondary);
}

.split-option.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.split-option-radio {
  width: 18px;
  height: 18px;
  border: 2px solid var(--text-muted);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.split-option.active .split-option-radio {
  border-color: var(--accent);
}

.split-option.active .split-option-radio::after {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
}

.split-option-content {
  flex: 1;
}

.split-option-title {
  font-size: var(--font-md);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.split-option-desc {
  font-size: var(--font-sm);
  color: var(--text-secondary);
}

.split-range-input {
  margin-top: var(--space-3);
  display: none;
}

.split-option.active .split-range-input {
  display: block;
}

/* ======================================
   Password Modal
   ====================================== */
.password-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.password-strength {
  height: 4px;
  background: var(--bg-hover);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: var(--space-1);
}

.password-strength-bar {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--transition), background var(--transition);
}

.password-strength-weak { width: 33%; background: var(--danger); }
.password-strength-medium { width: 66%; background: var(--warning); }
.password-strength-strong { width: 100%; background: var(--success); }

/* ======================================
   Page Settings Modal (Add/Insert page)
   ====================================== */
.page-size-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
}

.page-size-option {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 2px solid var(--border-primary);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-tertiary);
}

.page-size-option:hover {
  border-color: var(--border-secondary);
}

.page-size-option.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.page-size-option .size-label {
  font-size: var(--font-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.page-size-option .size-dims {
  font-size: var(--font-xs);
  color: var(--text-muted);
  margin-top: 2px;
}