/* ═══════════════════════════════════════════════════════════════════
   Demo Kilowattia — styles.css
   Sistema de diseño base para la demo visual frontend
   ═══════════════════════════════════════════════════════════════════ */

/* ─── CSS Variables ────────────────────────────────────────────── */
:root {
  /* Colores principales — Kilowattia brand */
  --kw-green:        #4CAF50;
  --kw-green-dark:   #388E3C;
  --kw-green-light:  #66BB6A;
  --kw-green-bg:     #E8F5E9;
  --kw-green-hover:  #43A047;

  /* Verde para energía */
  --energy-green:    #00C853;
  --energy-yellow:   #FFD600;
  --energy-red:      #FF1744;

  /* Neutros */
  --bg-app:          #F0F2F5;
  --bg-card:         #FFFFFF;
  --bg-sidebar:      var(--kw-green);
  --bg-sidebar-hover:#43A047;
  --bg-topbar:       var(--kw-green);

  /* Texto */
  --text-primary:    #1A1A2E;
  --text-secondary:  #5A6272;
  --text-muted:      #9CA3AF;
  --text-inverse:    #FFFFFF;
  --text-sidebar:    #FFFFFF;

  /* Bordes y sombras */
  --border-light:    #E4E7EC;
  --shadow-card:     0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-card-hover: 0 4px 12px rgba(0,0,0,0.10), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-topbar:   0 1px 0 var(--border-light);

  /* Tipografía */
  --font-display:    'Roboto', sans-serif;
  --font-body:       'Roboto', sans-serif;

  /* Espaciado base (8px grid) */
  --space-1:   4px;
  --space-2:   8px;
  --space-3:   12px;
  --space-4:   16px;
  --space-5:   20px;
  --space-6:   24px;
  --space-8:   32px;
  --space-10:  40px;
  --space-12:  48px;

  /* Bordes */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;

  /* Sidebar */
  --sidebar-width: 240px;
  --sidebar-collapsed: 64px;

  /* Topbar */
  --topbar-height: 60px;

  /* Mobile bottom nav */
  --mobile-bottom-nav-height: 64px;

  /* Transiciones */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 14px;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden; /* App shell: scroll en dashboard container */
  height: 100vh;
}

/* ─── Scrollbar personalizada ───────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* ─── App Shell Layout ──────────────────────────────────────────── */
.app-shell {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ─── Sidebar ──────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: fixed;
  left: 0;
  top: 0;
  z-index: 100;
  transition: width var(--transition-base), min-width var(--transition-base);
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed);
  min-width: var(--sidebar-collapsed);
}

/* Logo */
.sidebar-logo {
  height: 80px;
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-4);
  border-bottom: 1px solid rgba(0, 0, 0, 0.12);
  background: var(--kw-green);
}

.logo-image {
  max-width: 190px;
  width: 100%;
  height: auto;
  display: block;
}

.sidebar.collapsed .logo-image {
  display: none;
}

.sidebar.collapsed .sidebar-logo::after {
  content: '';
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: block;
}

/* Navegación */
.sidebar-nav {
  flex: 1;
  padding: 0;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  background: var(--kw-green);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 14px 18px;
  border-radius: 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.12);
  color: rgba(255, 255, 255, 0.92);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: background var(--transition-fast);
  white-space: nowrap;
  overflow: hidden;
  position: relative;
  width: 100%;
  box-sizing: border-box;
}

.nav-item i {
  font-size: 1.15rem;
  flex-shrink: 0;
  width: 22px;
  text-align: center;
  color: #FFFFFF;
}

.nav-item span {
  overflow: hidden;
  text-overflow: ellipsis;
  color: #FFFFFF;
}

.sidebar.collapsed .nav-item span {
  display: none;
}

.nav-item:hover {
  background: rgba(0, 0, 0, 0.08);
  color: #FFFFFF;
}

.nav-item.active {
  background: rgba(0, 0, 0, 0.14);
  color: #FFFFFF;
  font-weight: 600;
  border: none;
  border-bottom: 1px solid rgba(0, 0, 0, 0.12);
}

.nav-item.active i {
  color: #FFFFFF;
}

.nav-item.nav-item-disabled {
  opacity: 0.65;
  cursor: default;
}

.nav-item.nav-item-disabled:hover {
  background: transparent;
}

/* Footer / Badge demo */
.sidebar-footer {
  padding: var(--space-4);
  border-top: 1px solid rgba(255,255,255,0.12);
}

.demo-badge {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.24);
  border-radius: var(--radius-md);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.demo-badge i {
  font-size: 1rem;
  color: #FFF176;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 95;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.sidebar.mobile-open ~ .sidebar-overlay {
  display: block;
  opacity: 1;
}

.sidebar.collapsed .demo-badge span {
  display: none;
}

@media (max-width: 768px) {
  .sidebar-overlay {
    display: none;
  }

  .sidebar.mobile-open ~ .sidebar-overlay {
    display: block;
  }
}

/* ─── Main Content ─────────────────────────────────────────────── */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  transition: margin-left var(--transition-base);
}

.sidebar.collapsed ~ .main-content {
  margin-left: var(--sidebar-collapsed);
}

/* ─── Topbar ───────────────────────────────────────────────────── */
.topbar {
  height: var(--topbar-height);
  min-height: var(--topbar-height);
  background: var(--bg-topbar);
  border-bottom: 1px solid rgba(0,0,0,0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-5);
  box-shadow: 0 1px 2px rgba(0,0,0,0.08);
  position: relative;
  z-index: 50;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.topbar-toggle {
  display: none;
  background: rgba(255,255,255,0.14);
  border: none;
  cursor: pointer;
  color: #FFFFFF;
  font-size: 1.3rem;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.topbar-toggle:hover {
  background: rgba(255,255,255,0.24);
  color: #FFFFFF;
}

.topbar-title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: #FFFFFF;
}

.topbar-title h1 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0;
}

.topbar-title i {
  font-size: 1.3rem;
  color: #FFFFFF;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Botones topbar */
.topbar-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: #FFFFFF;
  font-size: 1.15rem;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
  position: relative;
}

.topbar-btn:hover {
  background: rgba(0,0,0,0.08);
}

.topbar-btn:active {
  transform: scale(0.95);
}

/* Notificación dot */
.notification-dot {
  position: absolute;
  top: 5px;
  right: 5px;
  width: 8px;
  height: 8px;
  background: var(--energy-red);
  border-radius: 50%;
  border: 1.5px solid var(--kw-green);
}

/* Usuario */
.topbar-user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2) var(--space-1) var(--space-1);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background var(--transition-fast);
  margin-left: var(--space-2);
  color: #FFFFFF;
}

.topbar-user:hover {
  background: rgba(0,0,0,0.08);
}

.user-avatar {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
}

.user-avatar i {
  font-size: 2rem;
  line-height: 1;
}

.user-label {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.user-label span {
  font-size: 0.85rem;
  font-weight: 600;
  color: #FFFFFF;
}

.user-label small {
  font-size: 0.7rem;
  font-weight: 400;
  color: rgba(255,255,255,0.8);
}

/* ─── Dashboard Container ──────────────────────────────────────── */
.dashboard-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--space-5);
  background: var(--bg-app);
}

.dashboard-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: var(--space-3);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.dashboard-loading i {
  font-size: 2rem;
  animation: spin 1s linear infinite;
}

/* ─── Cards / Widget containers ────────────────────────────────── */
.kw-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

.kw-card:hover {
  box-shadow: var(--shadow-card-hover);
}

.kw-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border-light);
}

.kw-card-title {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.kw-card-title i {
  color: var(--kw-green);
  font-size: 1.1rem;
}

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

/* ─── Badges de estado ─────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--4px);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.badge-normal   { background: #E8F5E9; color: #2E7D32; }
.badge-atencion { background: #FFF8E1; color: #F57F17; }
.badge-critico  { background: #FFEBEE; color: #C62828; }
.badge-info     { background: var(--kw-green-bg); color: var(--kw-green-dark); }

/* ─── Grid system ──────────────────────────────────────────────── */
.dashboard-grid {
  display: grid;
  gap: var(--space-4);
}

.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ─── Animaciones ──────────────────────────────────────────────── */
@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn var(--transition-base) ease forwards;
}

/* ─── Responsive ───────────────────────────────────────────────── */
@media (max-width: 1200px) {
  .grid-cols-4 { grid-template-columns: repeat(3, 1fr); }
  .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 1024px) {
  :root {
    --sidebar-width: var(--sidebar-collapsed);
  }

  .sidebar {
    width: var(--sidebar-collapsed);
    min-width: var(--sidebar-collapsed);
  }

  .sidebar-logo {
    padding: 0;
    justify-content: center;
  }

  .logo-image {
    display: none;
  }

  .sidebar-logo::after {
    content: '';
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: block;
  }

  .nav-item span,
  .demo-badge span,
  .user-label {
    display: none;
  }

  .sidebar-nav {
    align-items: center;
  }

  .nav-item {
    justify-content: center;
    padding: var(--space-3);
  }

  .topbar-toggle {
    display: flex;
  }

  .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
  }

  .sidebar {
    transform: translateX(-100%);
    width: 260px;
    min-width: 260px;
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  .sidebar-logo {
    padding: 0 var(--space-4);
    justify-content: center;
  }

  .sidebar-logo::after {
    display: none;
  }

  .logo-image {
    display: block;
    max-width: 180px;
  }

  .nav-item span,
  .demo-badge span,
  .user-label {
    display: flex;
  }

  .sidebar-nav {
    align-items: stretch;
  }

  .nav-item {
    justify-content: flex-start;
    padding: var(--space-3) var(--space-3);
    width: 100%;
  }

  .main-content {
    margin-left: 0;
  }

  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr !important;
  }

  .dashboard-grid .widget-cell {
    grid-column: 1 / -1 !important;
    min-height: auto !important;
    height: auto !important;
  }

  .topbar-title h1 {
    font-size: 1rem;
  }

  .topbar-title i {
    font-size: 1.1rem;
  }

  .topbar-btn {
    width: 34px;
    height: 34px;
    font-size: 1rem;
  }

  .user-avatar i {
    font-size: 1.7rem;
  }

  /* ThingsBoard-style preview grids on mobile */
  html body .app-shell .main-content .dashboard-container .tb-preview-grid,
  html body .app-shell .main-content .dashboard-container #dispositivosTbGrid,
  html body .app-shell .main-content .dashboard-container #eficienciaTbGrid,
  html body .app-shell .main-content .dashboard-container #energiaTbGrid {
    display: grid !important;
    grid-template-columns: 1fr !important;
    grid-auto-rows: auto !important;
    gap: var(--space-4) !important;
    padding: var(--space-3) !important;
    background: transparent !important;
  }

  html body .app-shell .main-content .dashboard-container .tb-preview-grid .tb-widget-cell,
  html body .app-shell .main-content .dashboard-container #dispositivosTbGrid .tb-widget-cell,
  html body .app-shell .main-content .dashboard-container #energiaTbGrid .tb-widget-cell {
    grid-column: 1 / -1 !important;
    grid-row: auto !important;
    min-width: 0 !important;
    min-height: 280px !important;
    height: auto !important;
  }

  /* Eficiencia: header chico, KPIs moderados, chart amplio */
  html body .app-shell .main-content .dashboard-container #eficienciaTbGrid {
    gap: var(--space-3) !important;
  }
  html body .app-shell .main-content .dashboard-container #eficienciaTbGrid .tb-widget-cell {
    min-height: 0 !important;
  }
  html body .app-shell .main-content .dashboard-container #eficienciaTbGrid .tb-widget-cell:first-child {
    min-height: 96px !important;
  }
  html body .app-shell .main-content .dashboard-container #eficienciaTbGrid .tb-widget-cell:nth-child(n+2):nth-child(-n+5) {
    min-height: 240px !important;
  }
  html body .app-shell .main-content .dashboard-container #eficienciaTbGrid .tb-widget-cell:last-child {
    min-height: 320px !important;
  }

  /* Energia: filtro corto, resto parejo a 280px (igual que el resto del grid) */
  html body .app-shell .main-content .dashboard-container #energiaTbGrid .tb-widget-cell {
    min-height: 0 !important;
  }
  html body .app-shell .main-content .dashboard-container #energiaTbGrid .tb-widget-cell:first-child {
    min-height: 96px !important;
  }
  html body .app-shell .main-content .dashboard-container #energiaTbGrid .tb-widget-cell:nth-child(2) {
    min-height: 280px !important;
  }
  html body .app-shell .main-content .dashboard-container #energiaTbGrid .tb-widget-cell:nth-child(3) {
    min-height: 280px !important;
  }
  html body .app-shell .main-content .dashboard-container #energiaTbGrid .tb-widget-cell:nth-child(4) {
    min-height: 280px !important;
  }
  html body .app-shell .main-content .dashboard-container #energiaTbGrid .tb-widget-cell:nth-child(5) {
    min-height: 280px !important;
  }

  html body .app-shell .main-content .dashboard-container .tb-preview-grid .tb-widget-cell .tb-widget-root,
  html body .app-shell .main-content .dashboard-container .tb-preview-grid .tb-widget-cell .widget-content,
  html body .app-shell .main-content .dashboard-container #dispositivosTbGrid .tb-widget-cell .tb-widget-root,
  html body .app-shell .main-content .dashboard-container #dispositivosTbGrid .tb-widget-cell .widget-content,
  html body .app-shell .main-content .dashboard-container #eficienciaTbGrid .tb-widget-cell .tb-widget-root,
  html body .app-shell .main-content .dashboard-container #eficienciaTbGrid .tb-widget-cell .widget-content,
  html body .app-shell .main-content .dashboard-container #energiaTbGrid .tb-widget-cell .tb-widget-root,
  html body .app-shell .main-content .dashboard-container #energiaTbGrid .tb-widget-cell .widget-content {
    height: auto !important;
    min-height: auto !important;
  }
}

/* ─── Mobile bottom navigation ─────────────────────────────────── */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: var(--mobile-bottom-nav-height);
  background: #FFFFFF;
  border-top: 1px solid var(--border-light);
  z-index: 90;
  box-shadow: 0 -2px 8px rgba(0,0,0,0.06);
}

.mobile-nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 8px 4px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.7rem;
  font-weight: 500;
  transition: color var(--transition-fast), background var(--transition-fast);
  cursor: pointer;
  min-width: 0;
}

.mobile-nav-item i {
  font-size: 1.35rem;
}

.mobile-nav-item span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.mobile-nav-item.active {
  color: var(--kw-green);
}

.mobile-nav-item:not(.mobile-nav-item-disabled):hover,
.mobile-nav-item:not(.mobile-nav-item-disabled):active {
  background: rgba(76, 175, 80, 0.08);
}

.mobile-nav-item.mobile-nav-item-disabled {
  opacity: 0.45;
  cursor: default;
  pointer-events: none;
}

@media (max-width: 480px) {
  .dashboard-container {
    padding: var(--space-3);
  }

  /* En móvil pequeño ocultar fullscreen, mantener 3 puntos */
  #fullscreenBtn {
    display: none;
  }

  .topbar-title h1 {
    font-size: 0.9rem;
  }
}

@media (max-width: 768px) {
  .dashboard-container {
    padding-bottom: calc(var(--space-5) + var(--mobile-bottom-nav-height));
  }

  .mobile-bottom-nav {
    display: flex;
  }

  .topbar-right .topbar-user {
    display: none;
  }

  .topbar-right .topbar-btn[title="Notificaciones"] {
    display: none;
  }

  .topbar-right .topbar-btn[title="Más opciones"] {
    display: none;
  }
}

/* ═══════════════════════════════════════════════════════════════════
   LOGIN DEMO — pantalla de acceso a la demo
   Estilo inspirado en login real Kilowattia (ThingsBoard).
   NO es autenticación real: es una compuerta visual para demo.
   ═══════════════════════════════════════════════════════════════════ */

.hidden {
  display: none !important;
}

/* Reset del overflow cuando solo se ve el login */
body.demo-login-active {
  overflow: hidden;
  height: 100vh;
}

.demo-login {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--kw-green);
  background-image:
    radial-gradient(circle at 20% 10%, rgba(255,255,255,0.04), transparent 40%),
    radial-gradient(circle at 80% 90%, rgba(0,0,0,0.10), transparent 50%);
  padding: var(--space-6);
  z-index: 200;
  animation: demoLoginFade 350ms ease both;
}

@keyframes demoLoginFade {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.demo-login-card {
  width: 100%;
  max-width: 660px;
  background: rgba(46, 125, 50, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-12) var(--space-10) var(--space-8);
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.18),
    0 4px 14px rgba(0, 0, 0, 0.10);
  color: #FFFFFF;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  text-align: center;
}

.demo-login-logo {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: var(--space-8);
}

.demo-login-logo img {
  max-width: 288px;
  max-height: 144px;
  width: auto;
  height: auto;
  display: block;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.18));
}

.demo-login-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: #FFFFFF;
  margin: 0 0 var(--space-8);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.18);
}

.demo-login-button {
  display: block;
  width: 100%;
  padding: 14px var(--space-5);
  background: #3F51B5;
  color: #FFFFFF;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0,0,0,0.18);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.demo-login-button:hover {
  background: #354296;
  box-shadow: 0 3px 6px rgba(0,0,0,0.22);
}

.demo-login-button:active {
  transform: translateY(1px);
  box-shadow: 0 1px 2px rgba(0,0,0,0.18);
}

.demo-login-button:focus-visible {
  outline: 3px solid rgba(255, 255, 255, 0.5);
  outline-offset: 2px;
}

.demo-login-footer {
  margin-top: var(--space-8);
  text-align: center;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.85);
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* Responsive: tablet */
@media (max-width: 768px) {
  .demo-login {
    padding: var(--space-4);
  }

  .demo-login-card {
    padding: var(--space-8) var(--space-6) var(--space-6);
  }

  .demo-login-title {
    font-size: 1.25rem;
  }

  .demo-login-logo {
    margin-bottom: var(--space-6);
  }

  .demo-login-logo img {
    max-width: 240px;
    max-height: 120px;
  }
}

/* Responsive: móvil pequeño */
@media (max-width: 480px) {
  .demo-login-card {
    padding: var(--space-6) var(--space-4) var(--space-5);
  }

  .demo-login-title {
    font-size: 1.1rem;
  }

  .demo-login-logo img {
    max-width: 204px;
    max-height: 108px;
  }

  .demo-login-field input {
    font-size: 0.92rem;
  }
}