/* ==========================================================================
   Emergency Prescription Card System - Core Design System & Tokens
   ========================================================================== */

:root {
  /* Color Palette - Medical & Emergency High-Contrast */
  --color-emergency-red: #dc2626;
  --color-emergency-red-dark: #991b1b;
  --color-emergency-red-bg: #fef2f2;
  --color-emergency-red-border: #fecaca;

  --color-alert-amber: #d97706;
  --color-alert-amber-bg: #fffbeb;
  --color-alert-amber-border: #fde68a;

  --color-medical-blue: #0284c7;
  --color-medical-blue-dark: #0369a1;
  --color-medical-blue-bg: #f0f9ff;
  --color-medical-blue-border: #bae6fd;

  --color-success-green: #16a34a;
  --color-success-green-bg: #f0fdf4;
  --color-success-green-border: #bbf7d0;

  /* Neutral Surface & Typography */
  --bg-app: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-surface-subtle: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --border-subtle: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-strong: #94a3b8;

  /* Elevation & Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.05);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.06);

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Layout */
  --max-width-responder: 740px;
  --max-width-admin: 1100px;
  --header-height: 64px;
}

/* Reset & Base Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-app);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* App Header Navigation */
.app-header {
  height: var(--header-height);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  text-decoration: none;
}

.header-brand .brand-badge {
  background: var(--color-emergency-red);
  color: #fff;
  border-radius: var(--radius-sm);
  padding: 4px 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-link {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-surface-subtle);
}

.nav-link.active {
  color: var(--color-medical-blue-dark);
  background: var(--color-medical-blue-bg);
}

/* Main Content Container */
.main-content {
  flex: 1;
  padding: 1.5rem;
  max-width: var(--max-width-admin);
  width: 100%;
  margin: 0 auto;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, transform 0.05s ease, box-shadow 0.15s ease;
  user-select: none;
  line-height: 1.25;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--color-medical-blue);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--color-medical-blue-dark);
  box-shadow: var(--shadow-md);
}

.btn-emergency {
  background: var(--color-emergency-red);
  color: #ffffff;
}

.btn-emergency:hover {
  background: var(--color-emergency-red-dark);
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.btn-secondary:hover {
  background: var(--bg-surface-subtle);
  border-color: var(--border-strong);
}

.btn-outline-danger {
  background: transparent;
  color: var(--color-emergency-red);
  border-color: var(--color-emergency-red-border);
}

.btn-outline-danger:hover {
  background: var(--color-emergency-red-bg);
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.825rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.85rem 1.5rem;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

/* Badges & Tags */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-danger {
  background: var(--color-emergency-red-bg);
  color: var(--color-emergency-red-dark);
  border: 1px solid var(--color-emergency-red-border);
}

.badge-warning {
  background: var(--color-alert-amber-bg);
  color: var(--color-alert-amber);
  border: 1px solid var(--color-alert-amber-border);
}

.badge-info {
  background: var(--color-medical-blue-bg);
  color: var(--color-medical-blue-dark);
  border: 1px solid var(--color-medical-blue-border);
}

.badge-success {
  background: var(--color-success-green-bg);
  color: var(--color-success-green);
  border: 1px solid var(--color-success-green-border);
}

.badge-neutral {
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

/* Form Controls */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--color-medical-blue);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

/* Modals & Dialogs */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 580px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 1.75rem;
  position: relative;
  transform: translateY(12px) scale(0.98);
  transition: transform 0.2s ease;
}

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

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
}

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

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: var(--text-primary);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: slideUp 0.2s ease;
}

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

/* Responsive adjustments */
@media (max-width: 640px) {
  .app-header {
    padding: 0 1rem;
  }
  .main-content {
    padding: 1rem 0.75rem;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
}