/* ==========================================================================
   Blue Hen Bites — Shared Design System
   University of Delaware inspired, light-theme foundation.
   Loaded by base.html — available to every page automatically.
   ========================================================================== */


/* --------------------------------------------------------------------------
   1. DESIGN TOKENS (CSS Custom Properties)
   -------------------------------------------------------------------------- */
:root {
  /* --- UD Brand Colors --- */
  --ud-blue:         #00539F;
  --ud-blue-hover:   #003D73;
  --ud-navy:         #003C71;
  --ud-gold:         #FFD200;
  --ud-gold-hover:   #E6BD00;
  --ud-light-blue:   #00A0DF;
  --ud-red:          #AF1E2D;
  --ud-red-hover:    #8D1824;

  /* --- Neutrals (light theme) --- */
  --white:           #FFFFFF;
  --gray-50:         #F8FAFC;
  --gray-100:        #F1F5F9;
  --gray-200:        #E2E8F0;
  --gray-300:        #CBD5E1;
  --gray-400:        #94A3B8;
  --gray-500:        #64748B;
  --gray-600:        #475569;
  --gray-700:        #334155;
  --gray-800:        #1E293B;
  --gray-900:        #0F172A;

  /* --- Semantic --- */
  --success:         #16A34A;
  --success-bg:      #DCFCE7;
  --success-border:  #BBF7D0;
  --warning:         #D97706;
  --warning-bg:      #FEF3C7;
  --warning-border:  #FDE68A;
  --error:           #DC2626;
  --error-bg:        #FEE2E2;
  --error-border:    #FECACA;
  --info:            #0284C7;
  --info-bg:         #E0F2FE;
  --info-border:     #BAE6FD;

  /* --- Typography --- */
  --font-heading:    'greycliff-bold', Arial, Helvetica, sans-serif;
  --font-body:       'greycliff-light', Arial, Helvetica, sans-serif;
  --font-display:    'vanguard-regular', 'greycliff-bold', Arial, sans-serif;
  --font-mono:       ui-monospace, 'Cascadia Code', 'Fira Code', monospace;

  --text-xs:         0.75rem;
  --text-sm:         0.875rem;
  --text-base:       1rem;
  --text-lg:         1.125rem;
  --text-xl:         1.25rem;
  --text-2xl:        1.5rem;
  --text-3xl:        1.875rem;
  --text-4xl:        2.25rem;

  --leading-tight:   1.25;
  --leading-normal:  1.5;
  --leading-relaxed: 1.625;

  /* --- Spacing --- */
  --space-0:  0;
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* --- Border Radius --- */
  --radius-sm:   0.25rem;
  --radius-md:   0.375rem;
  --radius-lg:   0.5rem;
  --radius-xl:   0.75rem;
  --radius-2xl:  1rem;
  --radius-3xl:  1.5rem;
  --radius-full: 9999px;

  /* --- Shadows (light theme) --- */
  --shadow-xs:   0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm:   0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md:   0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg:   0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl:   0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  /* --- Transitions --- */
  --transition-fast:  150ms ease-in-out;
  --transition-base:  250ms ease-in-out;
  --transition-slow:  350ms ease-in-out;

  /* --- Layout --- */
  --container-max:    1200px;
  --container-narrow: 800px;
  --container-wide:   1400px;
}


/* --------------------------------------------------------------------------
   2. BASE / RESET
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--gray-800);
  background-color: var(--gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--ud-blue);
  text-decoration: none;
}

a:hover {
  color: var(--ud-blue-hover);
  text-decoration: underline;
}


/* --------------------------------------------------------------------------
   3. TYPOGRAPHY
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--gray-900);
  line-height: var(--leading-tight);
  margin-top: 0;
  margin-bottom: var(--space-3);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl);  }
h5 { font-size: var(--text-lg);  }
h6 { font-size: var(--text-base); }

p {
  margin-top: 0;
  margin-bottom: var(--space-4);
  color: var(--gray-600);
}

small, .text-sm { font-size: var(--text-sm); }
.text-xs        { font-size: var(--text-xs); }

.text-muted     { color: var(--gray-500); }


/* --------------------------------------------------------------------------
   4. BUTTONS
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-sm);
  line-height: 1.25;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.btn:focus-visible {
  outline: 2px solid var(--ud-blue);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 83, 159, 0.15);
}

.btn:disabled, .btn.disabled {
  opacity: 0.5;
  pointer-events: none;
}

/* Primary — UD Blue */
.btn-primary {
  background: var(--ud-blue);
  color: var(--white);
  border-color: var(--ud-blue);
}
.btn-primary:hover, .btn-primary:focus-visible {
  background: var(--ud-blue-hover);
  border-color: var(--ud-blue-hover);
  color: var(--white);
  text-decoration: none;
}

/* Secondary — neutral */
.btn-secondary {
  background: var(--white);
  color: var(--gray-700);
  border-color: var(--gray-300);
}
.btn-secondary:hover, .btn-secondary:focus-visible {
  background: var(--gray-50);
  border-color: var(--gray-400);
  color: var(--gray-800);
  text-decoration: none;
}

/* Outline — blue border on white */
.btn-outline {
  background: transparent;
  color: var(--ud-blue);
  border-color: var(--ud-blue);
}
.btn-outline:hover, .btn-outline:focus-visible {
  background: var(--ud-blue);
  color: var(--white);
  text-decoration: none;
}

/* Danger — red */
.btn-danger {
  background: var(--error);
  color: var(--white);
  border-color: var(--error);
}
.btn-danger:hover, .btn-danger:focus-visible {
  background: var(--ud-red-hover);
  border-color: var(--ud-red-hover);
  color: var(--white);
  text-decoration: none;
}

/* Success — green */
.btn-success {
  background: var(--success);
  color: var(--white);
  border-color: var(--success);
}
.btn-success:hover, .btn-success:focus-visible {
  background: #15803D;
  border-color: #15803D;
  color: var(--white);
  text-decoration: none;
}

/* Ghost — invisible until hover */
.btn-ghost {
  background: transparent;
  color: var(--gray-600);
  border-color: transparent;
}
.btn-ghost:hover, .btn-ghost:focus-visible {
  background: var(--gray-100);
  color: var(--gray-800);
  text-decoration: none;
}

/* Quiet danger — text-only destructive, doesn't dominate */
.btn-danger-quiet {
  background: transparent;
  color: var(--gray-500);
  border-color: transparent;
}
.btn-danger-quiet:hover, .btn-danger-quiet:focus-visible {
  background: var(--error-bg);
  color: var(--error);
  border-color: var(--error-border);
  text-decoration: none;
}

/* Sizes */
.btn-xs  { padding: var(--space-1) var(--space-2); font-size: var(--text-xs); border-radius: var(--radius-md); }
.btn-sm  { padding: var(--space-1) var(--space-3); font-size: var(--text-sm); border-radius: var(--radius-md); }
.btn-lg  { padding: var(--space-3) var(--space-6); font-size: var(--text-base); }

.btn-block { display: flex; width: 100%; }

/* Icon-only button */
.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
}
.btn-icon.btn-sm { width: 32px; height: 32px; }
.btn-icon.btn-xs { width: 28px; height: 28px; }

/* Icon-button ghost — quiet icon-only actions (edit, delete, etc.) */
.btn-icon.btn-ghost {
  color: var(--gray-400);
}
.btn-icon.btn-ghost:hover {
  color: var(--gray-700);
  background: var(--gray-100);
}

/* Legacy compat: .btn-add maps to primary (kept professional) */
.btn-add {
  background: var(--ud-blue);
  color: var(--white);
  border: 1px solid var(--ud-blue);
}
.btn-add:hover, .btn-add:focus-visible {
  background: var(--ud-blue-hover);
  color: var(--white);
  border-color: var(--ud-blue-hover);
  text-decoration: none;
}


/* --------------------------------------------------------------------------
   5. FORM CONTROLS
   -------------------------------------------------------------------------- */
.form-label {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: var(--space-1);
}

.form-control,
.form-select,
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="url"],
input[type="number"],
input[type="password"],
input[type="date"],
input[type="search"],
textarea,
select {
  display: block;
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  color: var(--gray-800);
  background-color: var(--white);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
  -webkit-appearance: none;
  appearance: none;
}

.form-control:focus,
.form-select:focus,
input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--ud-blue);
  box-shadow: 0 0 0 3px rgba(0, 83, 159, 0.15);
}

.form-control::placeholder,
input::placeholder,
textarea::placeholder {
  color: var(--gray-400);
}

.form-control:disabled,
input:disabled,
textarea:disabled,
select:disabled {
  background-color: var(--gray-100);
  color: var(--gray-400);
  cursor: not-allowed;
}

/* Checkboxes & radios */
input[type="checkbox"],
input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--ud-blue);
  cursor: pointer;
}

.form-check {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) 0;
}

.form-check-label {
  font-size: var(--text-sm);
  color: var(--gray-700);
  cursor: pointer;
}

/* Form group spacing */
.form-group {
  margin-bottom: var(--space-4);
}

/* Validation */
.form-error {
  color: var(--error);
  font-size: var(--text-sm);
  margin-top: var(--space-1);
}

.form-control.is-invalid,
input.is-invalid {
  border-color: var(--error);
}

.form-control.is-invalid:focus,
input.is-invalid:focus {
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
}


/* --------------------------------------------------------------------------
   6. CARDS
   -------------------------------------------------------------------------- */
.ds-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl);
  box-shadow: none;
  overflow: hidden;
  transition:
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

.ds-card-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--gray-200);
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--gray-900);
}

.ds-card-body {
  padding: var(--space-4) var(--space-5);
}

.ds-card-footer {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--gray-200);
  background: var(--gray-50);
}

/* Branded card header — UD Blue bg */
.ds-card-header-branded {
  background: var(--ud-blue);
  color: var(--white);
  border-bottom: 3px solid var(--ud-gold);
}


/* --------------------------------------------------------------------------
   7. BADGES / PILLS
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  line-height: 1.5;
  white-space: nowrap;
}

.badge-default   { background: var(--gray-100);     color: var(--gray-700); }
.badge-primary   { background: var(--ud-blue);       color: var(--white); }
.badge-gold      { background: var(--ud-gold);       color: var(--gray-900); }
.badge-success   { background: var(--success-bg);    color: #166534; border: 1px solid var(--success-border); }
.badge-warning   { background: var(--warning-bg);    color: #92400E; border: 1px solid var(--warning-border); }
.badge-error     { background: var(--error-bg);      color: #991B1B; border: 1px solid var(--error-border); }
.badge-info      { background: var(--info-bg);       color: #075985; border: 1px solid var(--info-border); }

/* --------------------------------------------------------------------------
   8. ALERTS
   -------------------------------------------------------------------------- */
.ds-alert {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  border: 1px solid transparent;
}

.ds-alert-info    { background: var(--info-bg);    color: #075985; border-color: var(--info-border); }
.ds-alert-success { background: var(--success-bg); color: #166534; border-color: var(--success-border); }
.ds-alert-warning { background: var(--warning-bg); color: #92400E; border-color: var(--warning-border); }
.ds-alert-error   { background: var(--error-bg);   color: #991B1B; border-color: var(--error-border); }


/* --------------------------------------------------------------------------
   11. PAGE LAYOUT CONTAINERS
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.container-narrow {
  max-width: var(--container-narrow);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

/* Legacy compat */
.container-1200 {
  max-width: var(--container-max);
  margin: var(--space-5) auto;
  padding: 0 var(--space-4);
}

/* Page title bar — used below UD header for page-specific title + actions */
.page-title-bar {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: var(--space-4) var(--space-6);
}

.page-title-bar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.page-title-bar h1,
.page-title-bar h2 {
  margin: 0;
  font-size: var(--text-2xl);
  color: var(--gray-900);
  line-height: 1.2;
}

.page-title-bar .subtitle {
  font-size: var(--text-sm);
  color: var(--gray-500);
  margin: var(--space-1) 0 0;
}

/* Title bar action group — wraps buttons on the right */
.page-title-bar .title-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   11. GRID LAYOUTS
   -------------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--space-4);
}

/* Legacy compat */
.menu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
}

/* --------------------------------------------------------------------------
   13. EMPTY / LOADING / ERROR STATES
   -------------------------------------------------------------------------- */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-4);
  color: var(--gray-500);
}

.empty-state-icon {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-3);
  color: var(--gray-300);
}
.empty-state-icon svg {
  margin: 0 auto;
  width: 48px;
  height: 48px;
  color: var(--gray-300);
}

.empty-state h3 {
  font-size: var(--text-lg);
  color: var(--gray-700);
  margin-bottom: var(--space-2);
}

.empty-state p {
  font-size: var(--text-sm);
  color: var(--gray-500);
  margin-bottom: var(--space-4);
}

/* Inline empty — for inside lists, grids (no padding, left-aligned) */
.empty-inline {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--gray-400);
  font-style: italic;
}

/* Spinner */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--ud-blue);
  border-radius: 50%;
  animation: ds-spin 0.6s linear infinite;
}

@keyframes ds-spin {
  to { transform: rotate(360deg); }
}

/* Loading overlay */
.loading-overlay {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  color: var(--gray-500);
  gap: var(--space-3);
}

.loading-overlay .loading-text {
  font-size: var(--text-sm);
  color: var(--gray-400);
}


/* --------------------------------------------------------------------------
   14. UTILITIES
   -------------------------------------------------------------------------- */

/* Display */
.hidden           { display: none !important; }
.flex             { display: flex; }
.col              { display: flex; flex-direction: column; }

/* Flexbox */
.items-center     { align-items: center; }
.items-start      { align-items: flex-start; }
.justify-between  { justify-content: space-between; }
.justify-end      { justify-content: flex-end; }
.flex-wrap        { flex-wrap: wrap; }
.flex-1           { flex: 1; }

/* Gap */
.gap-1  { gap: var(--space-1); }
.gap-2  { gap: var(--space-2); }
.gap-3  { gap: var(--space-3); }
.gap-4  { gap: var(--space-4); }

/* Margin */
.mt-2   { margin-top: var(--space-2); }
.mt-3   { margin-top: var(--space-3); }
.mt-4   { margin-top: var(--space-4); }
.mb-1   { margin-bottom: var(--space-1); }
.mb-2   { margin-bottom: var(--space-2); }
.mb-3   { margin-bottom: var(--space-3); }
.mb-4   { margin-bottom: var(--space-4); }
.mb-8   { margin-bottom: var(--space-8); }

/* Padding */
.p-4    { padding: var(--space-4); }
.py-6   { padding-top: var(--space-6); padding-bottom: var(--space-6); }
.py-8   { padding-top: var(--space-8); padding-bottom: var(--space-8); }

/* Text */
.text-center  { text-align: center; }

/* Borders */
.border-b      { border-bottom: 1px solid var(--gray-200); }
.border-t      { border-top: 1px solid var(--gray-200); }

/* Divider */
.divider {
  height: 1px;
  background: var(--gray-200);
  border: none;
  margin: var(--space-4) 0;
}


/* --------------------------------------------------------------------------
   15. ACCESSIBILITY
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--ud-blue);
  outline-offset: 2px;
}

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


/* --------------------------------------------------------------------------
   16. RESPONSIVE BREAKPOINTS
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --text-4xl: 1.875rem;
    --text-3xl: 1.5rem;
    --text-2xl: 1.25rem;
  }

  .page-title-bar {
    padding: var(--space-3) var(--space-4);
  }

  .page-title-bar .container {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-title-bar .title-actions {
    width: 100%;
    justify-content: flex-start;
  }
}