/* ===================================================================
   NEXUS - INGENIERÍA DE HARDWARE, FIRMWARE & IOT
   Hoja de estilos comercial pura (CSS3 puro sin dependencias externas)
   Compatible con Cloudflare Pages y apertura directa en navegador.
   =================================================================== */

:root {
  /* Paleta base y superficies */
  --bg-deep: #07090e;
  --bg-surface: #0e131d;
  --bg-surface-elevated: #151c2a;
  --bg-surface-card: rgba(15, 20, 31, 0.85);
  --bg-surface-glass: rgba(11, 15, 24, 0.82);

  /* Bordes de precisión y guías de circuito */
  --border-hairline: rgba(255, 255, 255, 0.08);
  --border-subtle: rgba(56, 189, 248, 0.16);
  --border-focus: #38bdf8;
  --border-active: rgba(0, 210, 255, 0.45);

  /* Acentos tecnológicos */
  --color-cyan: #00d2ff;
  --color-blue: #38bdf8;
  --color-emerald: #10b981;
  --color-amber: #f59e0b;
  --color-red: #ef4444;
  --color-purple: #818cf8;

  /* Tipografía y textos */
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dim: #475569;

  /* Efectos y sombras de ingeniería */
  --glow-cyan: 0 0 25px rgba(0, 210, 255, 0.22);
  --glow-emerald: 0 0 25px rgba(16, 185, 129, 0.25);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-elevated: 0 20px 40px -15px rgba(0, 0, 0, 0.7);

  /* Fuentes */
  --font-sans: 'Outfit', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Roboto Mono', monospace;

  /* Transiciones */
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 250ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-deep);
  color: var(--text-main);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Patrón sutil de fondo de ingeniería (PCB grid + micro-puntos) */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    radial-gradient(circle at 50% 15%, rgba(0, 210, 255, 0.07) 0%, transparent 60%),
    radial-gradient(circle at 85% 65%, rgba(16, 185, 129, 0.04) 0%, transparent 50%);
  background-size: 40px 40px, 40px 40px, 100% 100%, 100% 100%;
  pointer-events: none;
  z-index: 0;
}

/* Contenedor centralizado */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Enlaces y botones base */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

/* ===================================================================
   TOP BAR NAVIGATION (3-Zone Contract)
   =================================================================== */
.navbar {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--bg-surface-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-hairline);
  z-index: 100;
  transition: all var(--transition-normal);
}

.navbar .nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  height: 72px;
}

/* Zona 1: Brand Wordmark */
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, #00d2ff, #0284c7);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #041220;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 0 15px rgba(0, 210, 255, 0.4);
}

.brand-accent {
  color: var(--color-cyan);
}

/* Zona 2: Enlaces de navegación */
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  position: relative;
  padding: 0.4rem 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-main);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--color-cyan);
  transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Zona 3: Acción primaria & Utilidades */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: #041220;
  background: linear-gradient(135deg, var(--color-cyan), #38bdf8);
  border-radius: 8px;
  white-space: nowrap;
  box-shadow: 0 2px 12px rgba(0, 210, 255, 0.25);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 210, 255, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  white-space: nowrap;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-subtle);
}

/* Botón menú móvil */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  padding: 7px;
}

.mobile-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text-main);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

/* ===================================================================
   HERO SECTION
   =================================================================== */
.hero-section {
  padding: 5rem 0 4rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--color-cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
}

.hero-kicker .kicker-icon {
  width: 6px;
  height: 6px;
  background: var(--color-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--color-cyan);
}

.hero-title {
  font-size: clamp(2.4rem, 4.2vw, 3.8rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 1.5rem;
  text-wrap: balance;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #ffffff 40%, var(--color-cyan) 85%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2.25rem;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

/* Barra de métricas de confianza adjunta */
.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-hairline);
}

.metric-item {
  display: flex;
  flex-direction: column;
}

.metric-value {
  font-size: 1.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--color-cyan);
  line-height: 1.2;
}

.metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 0.25rem;
}

/* Tarjeta interactiva de Hardware / PCB en el Hero */
.hero-visual {
  position: relative;
}

.pcb-preview-card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-elevated), var(--glow-cyan);
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.pcb-preview-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-active);
}

.pcb-image-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #000;
}

.pcb-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  display: block;
}

.pcb-preview-card:hover .pcb-image-wrapper img {
  transform: scale(1.03);
}

/* Puntos de prueba interactivos sobre el PCB */
.probe-point {
  position: absolute;
  width: 20px;
  height: 20px;
  transform: translate(-50%, -50%);
  cursor: pointer;
  z-index: 10;
}

.probe-ring {
  position: absolute;
  inset: 0;
  border: 2px solid var(--color-cyan);
  border-radius: 50%;
  animation: pulse-ring 2.5s infinite;
}

.probe-center {
  position: absolute;
  inset: 6px;
  background: var(--color-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-cyan);
}

.probe-point[data-probe="vcc"] .probe-ring { border-color: var(--color-amber); }
.probe-point[data-probe="vcc"] .probe-center { background: var(--color-amber); box-shadow: 0 0 10px var(--color-amber); }

.probe-point[data-probe="status"] .probe-ring { border-color: var(--color-emerald); }
.probe-point[data-probe="status"] .probe-center { background: var(--color-emerald); box-shadow: 0 0 10px var(--color-emerald); }

@keyframes pulse-ring {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(1.8); opacity: 0; }
}

.probe-tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(11, 15, 24, 0.95);
  border: 1px solid var(--border-subtle);
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-main);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
}

.probe-point:hover .probe-tooltip {
  opacity: 1;
  transform: translateX(-50%) translateY(-2px);
}

/* Barra de estado del PCB en la tarjeta */
.pcb-card-footer {
  padding: 1rem 1.25rem;
  background: var(--bg-surface-elevated);
  border-top: 1px solid var(--border-hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.pcb-info-block {
  display: flex;
  flex-direction: column;
}

.pcb-info-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.pcb-info-sub {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.telemetry-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--color-emerald);
}

.telemetry-indicator .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-emerald);
  box-shadow: 0 0 8px var(--color-emerald);
}

/* ===================================================================
   SECCIÓN DE SERVICIOS ESPECIALIZADOS
   =================================================================== */
.section {
  padding: 6rem 0;
  position: relative;
}

.section-header {
  margin-bottom: 3.5rem;
  max-width: 680px;
}

.section-label {
  display: inline-block;
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--color-cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(2rem, 3.2vw, 2.75rem);
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Bento grid para los 4 servicios */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.service-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 14px;
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-subtle);
  box-shadow: var(--shadow-card);
}

.service-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.service-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-cyan);
  font-weight: 600;
}

.service-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-cyan);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.service-card:hover .service-icon-box {
  background: rgba(56, 189, 248, 0.16);
  color: #fff;
}

.service-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.85rem;
  line-height: 1.3;
}

.service-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* Lista de capacidades técnicas clave */
.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-hairline);
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  white-space: nowrap;
}

.service-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-cyan);
  transition: gap var(--transition-fast), color var(--transition-fast);
}

.service-action-btn:hover {
  gap: 0.65rem;
  color: #fff;
}

/* ===================================================================
   SECCIÓN IOT EN TIEMPO REAL (Simulación interactiva)
   =================================================================== */
.iot-simulation-section {
  background: linear-gradient(180deg, rgba(7, 9, 14, 0.9), rgba(14, 19, 29, 0.95) 50%, rgba(7, 9, 14, 0.9));
  border-top: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
}

.iot-dashboard {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-elevated);
}

/* Barra superior del panel IoT */
.dashboard-topbar {
  padding: 1rem 1.5rem;
  background: var(--bg-surface-elevated);
  border-bottom: 1px solid var(--border-hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.device-id-badge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.device-avatar {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: rgba(0, 210, 255, 0.12);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-cyan);
}

.device-meta {
  display: flex;
  flex-direction: column;
}

.device-name {
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-main);
}

.device-connection {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.dashboard-controls-cluster {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.control-pill {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-hairline);
  padding: 0.35rem 0.8rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.btn-sm-action {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  padding: 0.35rem 0.8rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-main);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.btn-sm-action:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-subtle);
}

/* Cuerpo del simulador: 2 Columnas */
.dashboard-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  min-height: 440px;
}

/* Columna Izquierda: Actuadores y Microcontrolador */
.iot-control-panel {
  padding: 1.75rem;
  background: rgba(11, 15, 24, 0.6);
  border-right: 1px solid var(--border-hairline);
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.control-block-title {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--color-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

/* Tarjeta de LED virtual */
.actuator-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-hairline);
  border-radius: 10px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.actuator-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.actuator-label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  font-weight: 600;
}

/* El LED Virtual Visual */
.virtual-led {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #1e293b;
  border: 2px solid #334155;
  transition: all 0.2s ease;
  position: relative;
}

.virtual-led.active {
  background: var(--color-cyan);
  border-color: #e0f2fe;
  box-shadow: 0 0 16px var(--color-cyan), 0 0 30px rgba(0, 210, 255, 0.6);
}

.virtual-led.amber.active {
  background: var(--color-amber);
  border-color: #fef3c7;
  box-shadow: 0 0 16px var(--color-amber), 0 0 30px rgba(245, 158, 11, 0.6);
}

.virtual-led.green.active {
  background: var(--color-emerald);
  border-color: #d1fae5;
  box-shadow: 0 0 16px var(--color-emerald), 0 0 30px rgba(16, 185, 129, 0.6);
}

/* Interruptor Toggle */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: #1e293b;
  border: 1px solid var(--border-hairline);
  transition: .3s;
  border-radius: 26px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: #94a3b8;
  transition: .3s;
  border-radius: 50%;
}

input:checked + .toggle-slider {
  background-color: rgba(0, 210, 255, 0.25);
  border-color: var(--color-cyan);
}

input:checked + .toggle-slider:before {
  transform: translateX(22px);
  background-color: var(--color-cyan);
  box-shadow: 0 0 8px var(--color-cyan);
}

/* Selector de Pin GPIO */
.gpio-select-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.gpio-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.gpio-select {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  padding: 0.35rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-main);
  outline: none;
}

.gpio-select:focus {
  border-color: var(--color-cyan);
}

/* Dimmer PWM */
.pwm-slider-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.pwm-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.pwm-slider {
  width: 100%;
  accent-color: var(--color-cyan);
  cursor: pointer;
}

/* Relé virtual */
.relay-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-hairline);
  border-radius: 10px;
  padding: 1.25rem;
}

.relay-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.relay-state-text {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.relay-state-text.closed {
  color: var(--color-emerald);
}

.btn-relay-toggle {
  width: 100%;
  padding: 0.5rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-hairline);
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.btn-relay-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-subtle);
}

/* Columna Derecha: Gráfico de Sensores Canvas en tiempo real */
.iot-telemetry-view {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.telemetry-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.telemetry-readouts {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.readout-box {
  display: flex;
  flex-direction: column;
}

.readout-label {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
}

.readout-val {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
  line-height: 1.2;
}

.readout-val.temp { color: var(--color-cyan); }
.readout-val.hum { color: var(--color-emerald); }
.readout-val.pres { color: var(--color-purple); }

.graph-canvas-container {
  width: 100%;
  height: 220px;
  position: relative;
  background: rgba(7, 9, 14, 0.7);
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  overflow: hidden;
}

#sensorCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Panel inferior MQTT Stream */
.mqtt-log-terminal {
  border-top: 1px solid var(--border-hairline);
  background: #05070a;
  padding: 1rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.mqtt-terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.mqtt-topic {
  color: var(--color-cyan);
}

.mqtt-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-terminal-copy {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-hairline);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.btn-terminal-copy:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.1);
}

.mqtt-payload-display {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #a5f3fc;
  background: rgba(14, 20, 31, 0.7);
  border: 1px solid var(--border-hairline);
  padding: 0.75rem 1rem;
  border-radius: 6px;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ===================================================================
   SECCIÓN FILOSOFÍA DE INGENIERÍA & LABORATORIO
   =================================================================== */
.philosophy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.philosophy-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.pillar-item {
  display: flex;
  gap: 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  padding: 1.5rem;
  transition: border-color var(--transition-fast);
}

.pillar-item:hover {
  border-color: var(--border-subtle);
}

.pillar-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-cyan);
}

.pillar-body h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--text-main);
}

.pillar-body p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.lab-media-card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.lab-media-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
}

.lab-media-caption {
  padding: 1rem 1.25rem;
  background: var(--bg-surface-elevated);
  border-top: 1px solid var(--border-hairline);
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ===================================================================
   CALCULADORA / ESTIMADOR RÁPIDO DE PROYECTO
   =================================================================== */
.estimator-wrapper {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: var(--shadow-elevated);
}

.estimator-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.estimator-step-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.step-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.step-number {
  font-family: var(--font-mono);
  color: var(--color-cyan);
  font-size: 0.8rem;
}

.estimator-select {
  width: 100%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  padding: 0.65rem 0.85rem;
  font-size: 0.9rem;
  color: var(--text-main);
  outline: none;
  transition: border-color var(--transition-fast);
}

.estimator-select:focus {
  border-color: var(--color-cyan);
}

.estimator-result-box {
  background: rgba(7, 9, 14, 0.8);
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.result-specs {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.result-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-cyan);
}

.result-detail {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ===================================================================
   FORMULARIO DE CONTACTO Y COTIZACIÓN
   =================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 3.5rem;
}

.contact-info-panel {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin: 2rem 0;
}

.channel-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.channel-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: rgba(0, 210, 255, 0.08);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-cyan);
  flex-shrink: 0;
}

.channel-title {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.channel-val {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
}

.channel-val a:hover {
  color: var(--color-cyan);
}

/* Formulario */
.contact-form {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 0.92rem;
  color: var(--text-main);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.15);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-help {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ===================================================================
   MODAL DE CONFIRMACIÓN & ESPECIFICACIONES TÉCNICAS
   =================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 1000;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal-content {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  width: 100%;
  max-width: 580px;
  padding: 2.25rem;
  position: relative;
  box-shadow: var(--shadow-elevated), var(--glow-cyan);
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  font-size: 1.2rem;
  cursor: pointer;
}

.modal-close-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.1);
}

.modal-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-emerald);
  margin-bottom: 0.75rem;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.modal-body {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.75rem;
}

/* ===================================================================
   FOOTER
   =================================================================== */
.footer {
  border-top: 1px solid var(--border-hairline);
  background: #05070a;
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 1rem;
  max-width: 300px;
}

.footer-col h5 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--color-cyan);
}

.footer-bottom {
  border-top: 1px solid var(--border-hairline);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

/* Toast de feedback */
.toast-notice {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-focus);
  color: var(--text-main);
  padding: 0.85rem 1.4rem;
  border-radius: 8px;
  font-size: 0.88rem;
  font-family: var(--font-mono);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  z-index: 2000;
  display: none;
  animation: slide-up 0.3s ease;
}

@keyframes slide-up {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* ===================================================================
   RESPONSIVIDAD Y ACCESIBILIDAD
   =================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .services-grid {
    grid-template-columns: 1fr;
  }
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  .iot-control-panel {
    border-right: none;
    border-bottom: 1px solid var(--border-hairline);
  }
  .philosophy-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .estimator-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .mobile-toggle {
    display: flex;
  }
  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .estimator-steps {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 2.2rem;
  }
}