/* ============================================================
   MODAL / BOTTOM SHEET — Treatment selectors, date pickers,
   confirmation dialogs, detail views.

   USAGE (modal):
   <div class="modal-backdrop">
     <div class="modal">
       <div class="modal-header">
         <h3 class="modal-title">Select Treatment</h3>
         <button class="modal-close">&times;</button>
       </div>
       <div class="modal-body">...</div>
       <div class="modal-footer">
         <button class="btn btn--secondary">Cancel</button>
         <button class="btn btn--primary">Confirm</button>
       </div>
     </div>
   </div>
   ============================================================ */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal {
  background: var(--color-surface-base);
  border: 1px solid var(--color-border);
  border-radius: 0;                    /* Sharp corners */
  box-shadow: var(--shadow-modal);
  max-width: 600px;
  width: 100%;
  padding: 32px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.modal-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text-primary);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}

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

.modal-body {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.modal-footer {
  display: flex;
  gap: 16px;
  justify-content: flex-end;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  margin-top: 24px;
}