/* ==================== Buttons ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 0.88rem;
  font-weight: 500;
  border-radius: 6px;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

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

.btn-secondary {
  background: var(--color-bg-sidebar);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-border-light);
}

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

.btn-danger:hover {
  background: var(--color-danger-hover);
}

.btn-icon {
  padding: 7px;
  color: var(--color-text-secondary);
  border-radius: 6px;
}

.btn-icon:hover {
  background: var(--color-bg-sidebar);
  color: var(--color-text);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.8rem;
}

.btn-add-book {
  width: 100%;
  justify-content: center;
  padding: 10px;
  color: var(--color-primary);
  font-weight: 500;
}

.btn-add-book:hover {
  background: var(--color-primary-light);
}

/* ==================== Form Styles ==================== */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.88rem;
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(184, 134, 11, 0.15);
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
}

.form-check {
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-check input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary);
}

.form-hint {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* ==================== Modals ==================== */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
}

.modal-content {
  position: relative;
  width: 90%;
  max-width: 480px;
  background: var(--color-bg-card);
  border-radius: 10px;
  box-shadow: var(--shadow-md);
  transform: scale(0.95) translateY(8px);
  transition: transform 0.2s ease;
  color: var(--color-text);
}

.modal.active .modal-content {
  transform: scale(1) translateY(0);
}

.modal-sm .modal-content {
  max-width: 380px;
}

.modal-lg .modal-content {
  max-width: 640px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  border-bottom: 1px solid var(--color-border-light);
}

.modal-header h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
}

.modal-body {
  padding: 22px;
  max-height: 70vh;
  overflow-y: auto;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 14px 22px;
  border-top: 1px solid var(--color-border-light);
  background: var(--color-bg-sidebar);
  border-radius: 0 0 10px 10px;
}

/* ==================== Toast ==================== */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 2000;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: var(--color-text);
  color: var(--color-bg-card);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  animation: slideIn 0.3s ease;
  font-size: 0.9rem;
}

.toast.success {
  background: var(--color-success);
  color: white;
}

.toast.error {
  background: var(--color-danger);
  color: white;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideOut {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(20px);
  }
}

.toast.hiding {
  animation: slideOut 0.3s ease forwards;
}

/* ==================== Switch Toggle ==================== */
.switch {
  position: relative;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-border);
  transition: 0.3s;
  border-radius: 24px;
}

.switch-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.3s;
  border-radius: 50%;
}

.switch input:checked + .switch-slider {
  background-color: var(--color-primary);
}

.switch input:checked + .switch-slider:before {
  transform: translateX(20px);
}

/* ==================== Radio Group ==================== */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.radio-option {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.radio-option input[type="radio"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary);
}

/* ==================== Background Color Options ==================== */
.bg-color-options {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.bg-color-btn {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.bg-color-btn:hover {
  transform: scale(1.05);
}

.bg-color-btn.active {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* ==================== Cloud Options ==================== */
.cloud-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cloud-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--color-bg-sidebar);
  border-radius: 8px;
}

.cloud-icon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1rem;
}

.cloud-item span {
  flex: 1;
  font-weight: 500;
}

/* ==================== Export Background Options ==================== */
.export-bg-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px 0;
}

.export-bg-option {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.88rem;
}

.export-bg-option input[type="radio"] {
  width: 14px;
  height: 14px;
  accent-color: var(--color-primary);
}

/* ==================== Cover Upload Area ==================== */
.cover-upload-area {
  border: 2px dashed var(--color-border);
  border-radius: 12px;
  padding: 40px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-sidebar);
}

.cover-upload-area:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.cover-upload-area.dragover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.cover-upload-placeholder {
  color: var(--color-text-muted);
}

.cover-upload-placeholder svg {
  opacity: 0.5;
  margin-bottom: 12px;
}

.cover-upload-placeholder p {
  margin-bottom: 4px;
}

/* ==================== Cover Add Button ==================== */
.cover-add-btn {
  width: 100%;
  height: 320px;
  border: 2px dashed var(--color-border);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0.6;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  background: transparent;
}

.cover-add-btn:hover {
  opacity: 1;
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.cover-add-btn svg {
  width: 64px;
  height: 64px;
  color: var(--color-text-muted);
}

.cover-add-btn p {
  margin-top: 12px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ==================== WebDAV Help ==================== */
.webdav-help {
  margin-top: 20px;
  padding: 16px;
  background: var(--color-bg-sidebar);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.help-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-primary);
  font-size: 0.95rem;
}

.help-steps {
  padding-left: 20px;
  font-size: 0.88rem;
  line-height: 1.7;
}

.help-steps li {
  margin-bottom: 10px;
}

.help-steps pre {
  background: var(--color-bg-card);
  padding: 10px 12px;
  border-radius: 4px;
  margin: 6px 0;
  font-size: 0.8rem;
  font-family: monospace;
  border: 1px solid var(--color-border);
  white-space: pre-wrap;
}

/* ==================== Sync Header ==================== */
.sync-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--color-bg-sidebar);
  border-radius: 8px;
  margin-bottom: 16px;
}

.sync-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.sync-help {
  margin-top: 16px;
  padding: 12px;
  background: var(--color-bg-sidebar);
  border-radius: 6px;
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ==================== Settings Panel ==================== */
.settings-panel,
.settings-tabs {
  font-size: 1.05rem;
}

.settings-panel label {
  font-size: 1rem;
}

.settings-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--color-border-light);
}

.settings-tab {
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: 4px 4px 0 0;
  transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}

.settings-tab:hover {
  color: var(--color-text);
  background: var(--color-bg-sidebar);
}

.settings-tab.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-bottom: 2px solid var(--color-primary);
}

.settings-panel {
  display: none;
}

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