/*
 * styles-global.css — Sistema de diseño Nutrición Inteligente
 * Paleta médica accesible · WCAG 2.2 AA · Bootstrap 5.3 override
 * Tipografía: base ≥ 16px · Contraste ≥ 4.5:1 · Botones ≥ 48px
 */

/* ─── TOKENS ─────────────────────────────────── */
:root {
  /* Colores principales */
  --ni-blue-dark:   #0d3b66;
  --ni-blue:        #1a7abf;
  --ni-blue-light:  #e8f4fc;
  --ni-green:       #0f9d6d;
  --ni-green-light: #e6f7f2;
  --ni-orange:      #e67e22;
  --ni-red:         #c0392b;
  --ni-red-light:   #fdecea;
  --ni-purple:      #6c3483;
  --ni-gray-50:     #f8fafc;
  --ni-gray-100:    #f1f5f9;
  --ni-gray-200:    #e2e8f0;
  --ni-gray-400:    #94a3b8;
  --ni-gray-600:    #475569;
  --ni-gray-800:    #1e293b;
  --ni-white:       #ffffff;

  /* Semánticos */
  --ni-text-primary:   var(--ni-gray-800);
  --ni-text-secondary: var(--ni-gray-600);
  --ni-text-muted:     var(--ni-gray-400);
  --ni-border:         var(--ni-gray-200);
  --ni-surface:        var(--ni-white);
  --ni-surface-alt:    var(--ni-gray-50);

  /* Tipografía */
  --ni-font-body:    'Nunito', 'Segoe UI', Arial, sans-serif;
  --ni-font-heading: 'Nunito', 'Segoe UI', Arial, sans-serif;
  --ni-text-base:    1rem;       /* 16px */
  --ni-text-sm:      0.9375rem;  /* 15px */
  --ni-text-lg:      1.125rem;   /* 18px */
  --ni-text-xl:      1.25rem;

  /* Espaciado y radios */
  --ni-radius:    0.5rem;
  --ni-radius-lg: 0.75rem;
  --ni-shadow:    0 2px 12px rgba(0,0,0,.08);
  --ni-shadow-md: 0 4px 24px rgba(0,0,0,.12);

  /* Botones accesibles ≥ 48px */
  --ni-btn-height:    3rem;    /* 48px */
  --ni-btn-height-sm: 2.5rem;
  --ni-btn-gap:       0.5rem;  /* 8px */
}

/* ─── RESET & BASE ───────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: var(--ni-font-body);
  font-size: var(--ni-text-base);
  color: var(--ni-text-primary);
  background: var(--ni-gray-50);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Screen-reader only */
.sr-only {
  position: absolute !important;
  width: 1px !important; height: 1px !important;
  padding: 0 !important; margin: -1px !important;
  overflow: hidden !important; clip: rect(0,0,0,0) !important;
  white-space: nowrap !important; border: 0 !important;
}

/* Focus visible accesible */
:focus-visible {
  outline: 3px solid var(--ni-blue);
  outline-offset: 2px;
}

/* ─── HEADER ─────────────────────────────────── */
.ni-header {
  background: linear-gradient(135deg, var(--ni-blue-dark) 0%, var(--ni-blue) 100%);
  box-shadow: 0 2px 16px rgba(13,59,102,.35);
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.ni-header__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--ni-white);
}

.ni-header__logo {
  width: 36px; height: 36px;
  background: rgba(255,255,255,.15);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
}

.ni-header__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
}

.ni-header__subtitle {
  font-size: 0.75rem;
  opacity: .75;
  margin: 0;
}

.ni-header__nav {
  display: flex; align-items: center; gap: 0.5rem;
}

.ni-header__nav-link {
  color: rgba(255,255,255,.85);
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: var(--ni-radius);
  font-size: var(--ni-text-sm);
  font-weight: 600;
  transition: background .2s, color .2s;
  display: flex; align-items: center; gap: 0.4rem;
}

.ni-header__nav-link:hover,
.ni-header__nav-link--active {
  background: rgba(255,255,255,.18);
  color: var(--ni-white);
}

/* ─── CONTENEDOR PRINCIPAL ───────────────────── */
.ni-main {
  max-width: 1440px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
}

/* ─── PAGE TITLE ─────────────────────────────── */
.ni-page-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.ni-page-title__icon {
  width: 48px; height: 48px;
  border-radius: var(--ni-radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  color: var(--ni-white);
  flex-shrink: 0;
}

.ni-page-title__text h1 {
  font-size: var(--ni-text-xl);
  font-weight: 800;
  margin: 0;
  color: var(--ni-text-primary);
  line-height: 1.2;
}

.ni-page-title__text p {
  margin: 0;
  font-size: var(--ni-text-sm);
  color: var(--ni-text-secondary);
}

/* ─── CARD ───────────────────────────────────── */
.ni-card {
  background: var(--ni-surface);
  border-radius: var(--ni-radius-lg);
  box-shadow: var(--ni-shadow);
  border: 1px solid var(--ni-border);
  overflow: hidden;
}

.ni-card__header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--ni-border);
  background: var(--ni-surface-alt);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.ni-card__title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0;
  display: flex; align-items: center; gap: 0.5rem;
}

.ni-card__body { padding: 1.25rem; }

/* ─── BOTONES (≥ 48px WCAG) ──────────────────── */
.ni-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--ni-btn-gap);
  height: var(--ni-btn-height);
  padding: 0 1.25rem;
  border: 2px solid transparent;
  border-radius: var(--ni-radius);
  font-family: var(--ni-font-body);
  font-size: var(--ni-text-sm);
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: all .2s;
  white-space: nowrap;
  min-width: 48px;
}

.ni-btn--sm {
  height: var(--ni-btn-height-sm);
  padding: 0 0.875rem;
  font-size: 0.875rem;
}

.ni-btn--primary   { background: var(--ni-blue);    color: #fff; border-color: var(--ni-blue); }
.ni-btn--primary:hover   { background: var(--ni-blue-dark); border-color: var(--ni-blue-dark); }
.ni-btn--secondary { background: var(--ni-white);   color: var(--ni-text-primary); border-color: var(--ni-border); }
.ni-btn--secondary:hover { background: var(--ni-gray-100); }
.ni-btn--success   { background: var(--ni-green);   color: #fff; border-color: var(--ni-green); }
.ni-btn--danger    { background: var(--ni-red);     color: #fff; border-color: var(--ni-red); }
.ni-btn--ghost     { background: transparent;        color: var(--ni-text-secondary); border-color: transparent; }
.ni-btn--ghost:hover { background: var(--ni-gray-100); }
.ni-btn--active    { background: var(--ni-blue-light); color: var(--ni-blue); border-color: var(--ni-blue); }
.ni-btn:disabled   { opacity: .5; cursor: not-allowed; }

/* ─── TOOLBAR (buscador + acciones) ─────────────*/
.ni-toolbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.ni-search-wrapper {
  position: relative;
  flex: 1;
  min-width: 220px;
  max-width: 400px;
}

.ni-search-wrapper i {
  position: absolute;
  left: 0.875rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ni-text-muted);
  pointer-events: none;
}

.ni-search-input {
  width: 100%;
  height: var(--ni-btn-height);
  padding: 0 1rem 0 2.5rem;
  border: 2px solid var(--ni-border);
  border-radius: var(--ni-radius);
  font-size: var(--ni-text-sm);
  background: var(--ni-surface);
  color: var(--ni-text-primary);
  transition: border-color .2s;
}

.ni-search-input:focus {
  border-color: var(--ni-blue);
  outline: none;
}

/* ─── TABLA ──────────────────────────────────── */
.ni-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.ni-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--ni-text-sm);
}

.ni-table thead tr {
  background: var(--ni-gray-50);
  border-bottom: 2px solid var(--ni-border);
}

.ni-table th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 700;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--ni-text-secondary);
  white-space: nowrap;
}

.ni-table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--ni-border);
  vertical-align: middle;
}

.ni-table tbody tr:hover { background: var(--ni-blue-light); }
.ni-table tbody tr:last-child td { border-bottom: none; }

/* Opciones dropdown */
.ni-options-cell { width: 60px; text-align: center; }

.ni-dropdown {
  position: relative;
  display: inline-block;
}

.ni-dropdown__menu {
  position: absolute;
  left: 0;
  top: calc(100% + 4px);
  min-width: 180px;
  background: var(--ni-surface);
  border: 1px solid var(--ni-border);
  border-radius: var(--ni-radius);
  box-shadow: var(--ni-shadow-md);
  z-index: 500;
  display: none;
  overflow: hidden;
}

.ni-dropdown__menu--open { display: block; }

.ni-dropdown__item {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.625rem 1rem;
  font-size: var(--ni-text-sm);
  color: var(--ni-text-primary);
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  transition: background .15s;
  min-height: 44px;
}

.ni-dropdown__item:hover { background: var(--ni-gray-100); }
.ni-dropdown__item--danger { color: var(--ni-red); }
.ni-dropdown__item--danger:hover { background: var(--ni-red-light); }

/* ─── BADGE / ESTADO ─────────────────────────── */
.ni-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 700;
}

.ni-badge--activo   { background: var(--ni-green-light); color: var(--ni-green); }
.ni-badge--inactivo { background: var(--ni-gray-100);    color: var(--ni-gray-600); }
.ni-badge--leve     { background: #fff3cd; color: #856404; }
.ni-badge--media    { background: #ffe5d0; color: #c44b17; }
.ni-badge--grave    { background: var(--ni-red-light);   color: var(--ni-red); }

/* ─── FORMULARIO ─────────────────────────────── */
.ni-form-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

@media (max-width: 1100px) { .ni-form-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .ni-form-grid { grid-template-columns: 1fr; } }

.ni-form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.ni-form-group--full   { grid-column: 1 / -1; }
.ni-form-group--half   { grid-column: span 2; }

.ni-label {
  font-size: var(--ni-text-sm);
  font-weight: 700;
  color: var(--ni-text-primary);
}

.ni-label--required::after {
  content: ' *';
  color: var(--ni-red);
}

.ni-input,
.ni-select,
.ni-textarea {
  width: 100%;
  border: 2px solid var(--ni-border);
  border-radius: var(--ni-radius);
  font-family: var(--ni-font-body);
  font-size: var(--ni-text-base);
  color: var(--ni-text-primary);
  background: var(--ni-surface);
  transition: border-color .2s, box-shadow .2s;
  min-height: 48px; /* WCAG 2.2 */
}

.ni-input, .ni-select { padding: 0 0.875rem; }
.ni-textarea { padding: 0.625rem 0.875rem; min-height: 96px; resize: vertical; }

.ni-input:focus, .ni-select:focus, .ni-textarea:focus {
  border-color: var(--ni-blue);
  box-shadow: 0 0 0 3px rgba(26,122,191,.2);
  outline: none;
}

.ni-input[readonly], .ni-select[disabled], .ni-textarea[readonly] {
  background: var(--ni-gray-100);
  color: var(--ni-text-secondary);
  cursor: not-allowed;
}

.ni-input--error { border-color: var(--ni-red); }
.ni-field-error  { font-size: 0.8125rem; color: var(--ni-red); font-weight: 600; margin-top: 0.2rem; }

/* Checkbox accesible */
.ni-checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  cursor: pointer;
  font-size: var(--ni-text-base);
  min-height: 48px;
}

.ni-checkbox {
  width: 22px; height: 22px;
  border: 2px solid var(--ni-border);
  border-radius: 4px;
  accent-color: var(--ni-blue);
  flex-shrink: 0;
}

/* ─── MODAL ──────────────────────────────────── */
.ni-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 1.5rem 1rem;
  z-index: 2000;
  opacity: 0;
  transition: opacity .25s;
  overflow-y: auto;
}

.ni-modal-overlay--in { opacity: 1; }

.ni-modal-box {
  background: var(--ni-surface);
  border-radius: var(--ni-radius-lg);
  box-shadow: var(--ni-shadow-md);
  width: 100%;
  max-width: 900px;
  animation: slideUp .3s ease;
}

.ni-modal-box--sm  { max-width: 440px; }
.ni-modal-box--lg  { max-width: 1100px; }

@keyframes slideUp {
  from { transform: translateY(30px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.ni-modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--ni-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.ni-modal-header h3 {
  margin: 0;
  font-size: var(--ni-text-lg);
  font-weight: 800;
}

.ni-modal-body   { padding: 1.5rem; }
.ni-modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--ni-border);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ─── PAGINACIÓN ─────────────────────────────── */
.ni-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--ni-border);
  font-size: var(--ni-text-sm);
  color: var(--ni-text-secondary);
}

.ni-pagination__btns { display: flex; gap: 0.25rem; flex-wrap: wrap; }

/* ─── LOADER ─────────────────────────────────── */
.ni-loader {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  gap: 1rem;
  color: var(--ni-text-secondary);
  font-size: var(--ni-text-sm);
}

.ni-loader__spinner {
  width: 40px; height: 40px;
  border: 4px solid var(--ni-border);
  border-top-color: var(--ni-blue);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

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

/* ─── TOAST ──────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 360px;
}

.ni-toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border-radius: var(--ni-radius);
  box-shadow: var(--ni-shadow-md);
  font-size: var(--ni-text-sm);
  font-weight: 600;
  transform: translateX(120%);
  transition: transform .3s ease;
  background: var(--ni-surface);
  border-left: 4px solid transparent;
}

.ni-toast--in { transform: translateX(0); }
.ni-toast--out { transform: translateX(120%); }

.ni-toast--success { border-color: var(--ni-green); color: var(--ni-green); }
.ni-toast--error   { border-color: var(--ni-red);   color: var(--ni-red); }
.ni-toast--warning { border-color: var(--ni-orange); color: var(--ni-orange); }
.ni-toast--info    { border-color: var(--ni-blue);   color: var(--ni-blue); }

.ni-toast span { flex: 1; color: var(--ni-text-primary); }
.ni-toast__close { background: none; border: none; cursor: pointer; color: var(--ni-text-muted); padding: 0.25rem; min-width: 28px; }

/* ─── EMPTY STATE ────────────────────────────── */
.ni-empty {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 3.5rem 1rem; text-align: center; gap: 1rem;
}

.ni-empty i { font-size: 3rem; color: var(--ni-text-muted); }
.ni-empty h4 { margin: 0; font-size: var(--ni-text-lg); color: var(--ni-text-secondary); }
.ni-empty p  { margin: 0; color: var(--ni-text-muted); max-width: 320px; }

/* ─── VISTA DETALLE ──────────────────────────── */
.ni-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

@media (max-width: 900px) { .ni-detail-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .ni-detail-grid { grid-template-columns: 1fr; } }

.ni-detail-item { display: flex; flex-direction: column; gap: 0.2rem; }
.ni-detail-label { font-size: 0.8125rem; font-weight: 700; color: var(--ni-text-secondary); text-transform: uppercase; letter-spacing: .04em; }
.ni-detail-value { font-size: var(--ni-text-base); color: var(--ni-text-primary); word-break: break-word; }

/* ─── SECCIÓN COLAPSABLE (Progressive Disclosure) */
.ni-section-toggle {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; background: none; border: none; cursor: pointer;
  padding: 0.75rem 0; border-bottom: 2px solid var(--ni-border);
  font-family: var(--ni-font-body); font-size: var(--ni-text-base);
  font-weight: 700; color: var(--ni-text-primary);
}

.ni-section-toggle i { transition: transform .3s; }
.ni-section-toggle[aria-expanded="false"] i { transform: rotate(-90deg); }
.ni-section-body { padding-top: 1rem; }
.ni-section-body[hidden] { display: none; }

/* ─── PRINT ──────────────────────────────────── */
@media print {
  .ni-header, .ni-toolbar, .ni-pagination, .ni-btn,
  .ni-dropdown, #toast-container { display: none !important; }
  .ni-card { box-shadow: none; border: 1px solid #ccc; }
  body { font-size: 12pt; background: white; }
}

/* ─── RESPONSIVE HEADER ──────────────────────── */
@media (max-width: 768px) {
  .ni-header__nav .ni-header__nav-link span { display: none; }
  .ni-main { padding: 1rem 0.75rem; }
}