/* ==========================================================================
   STRUCTURAL S.A.S. — SISTEMA DE DISEÑO INDUSTRIAL & TECNOLÓGICO
   Soporta las 3 Propuestas de Evolución de Identidad Visual en tiempo real:
   - theme-evolution  (Propuesta A: Structural Evolution)
   - theme-industrial (Propuesta B: Structural Industrial)
   - theme-next       (Propuesta C: Structural Next)
   - theme-original   (Identidad Actual de Referencia)
   ========================================================================== */

:root,
[data-brand-theme="evolution"] {
  --bg-obsidian: #070b12;
  --bg-graphite: #0d1420;
  --bg-surface: #131d2e;
  --bg-surface-elevated: #19263c;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --accent-primary: #0ea5e9;
  --accent-primary-rgb: 14, 165, 233;
  --accent-secondary: #22c55e;
  --accent-secondary-rgb: 34, 197, 94;
  --accent-warning: #f59e0b;
  --border-subtle: rgba(148, 163, 184, 0.16);
  --border-strong: rgba(14, 165, 233, 0.45);
  --card-radius: 4px;
  --btn-clip: none;
  --font-display: "Barlow Condensed", "Oswald", "Impact", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans: "Inter", "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Monaco, Consolas, monospace;
}

[data-brand-theme="industrial"] {
  --bg-obsidian: #090a0d;
  --bg-graphite: #111318;
  --bg-surface: #181b22;
  --bg-surface-elevated: #212630;
  --text-primary: #ffffff;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  --accent-primary: #f59e0b;
  --accent-primary-rgb: 245, 158, 11;
  --accent-secondary: #38bdf8;
  --accent-secondary-rgb: 56, 189, 248;
  --border-subtle: rgba(245, 158, 11, 0.2);
  --border-strong: rgba(245, 158, 11, 0.65);
  --card-radius: 0px;
  --btn-clip: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

[data-brand-theme="next"] {
  --bg-obsidian: #050911;
  --bg-graphite: #09111f;
  --bg-surface: #0e1a2f;
  --bg-surface-elevated: #142440;
  --text-primary: #f0fdfa;
  --text-secondary: #bae6fd;
  --text-muted: #7dd3fc;
  --accent-primary: #06b6d4;
  --accent-primary-rgb: 6, 182, 212;
  --accent-secondary: #10b981;
  --accent-secondary-rgb: 16, 185, 129;
  --border-subtle: rgba(6, 182, 212, 0.22);
  --border-strong: rgba(16, 185, 129, 0.6);
  --card-radius: 8px;
  --btn-clip: none;
}

[data-brand-theme="original"] {
  --bg-obsidian: #09101a;
  --bg-graphite: #101b2b;
  --bg-surface: #162438;
  --bg-surface-elevated: #1e314b;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --accent-primary: #0077b6;
  --accent-primary-rgb: 0, 119, 182;
  --accent-secondary: #57b846;
  --accent-secondary-rgb: 87, 184, 70;
  --border-subtle: rgba(255, 255, 255, 0.15);
  --border-strong: rgba(87, 184, 70, 0.55);
  --card-radius: 4px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-obsidian);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.5;
}

body {
  background-color: var(--bg-obsidian);
  color: var(--text-primary);
  overflow-x: hidden;
  transition: background-color 0.35s ease, color 0.35s ease;
}

/* Rejilla técnica industrial sutil */
.bg-industrial-grid {
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
}

.container-structural {
  width: 100%;
  max-width: 1340px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ==========================================================================
   BARRA SUPERIOR DE EVOLUCIÓN DE IDENTIDAD (ENTREGABLE 3)
   ========================================================================== */
.brand-switcher-bar {
  background: linear-gradient(90deg, #04070c 0%, #0d1626 50%, #04070c 100%);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.5rem 0;
  font-size: 0.78rem;
  position: relative;
  z-index: 60;
}

.brand-switcher-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.brand-pill-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: center;
}

.brand-pill-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.3rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 2px;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.brand-pill-btn:hover {
  border-color: var(--accent-primary);
  color: #ffffff;
}

.brand-pill-btn.active {
  background: rgba(var(--accent-primary-rgb), 0.18);
  border-color: var(--accent-primary);
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 0 12px rgba(var(--accent-primary-rgb), 0.25);
}

.brand-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

/* ==========================================================================
   HEADER PRINCIPAL CORPORATIVO
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7, 11, 18, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  gap: 1.25rem;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: var(--text-primary);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color 0.2s ease;
  position: relative;
  padding: 0.35rem 0;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--accent-primary);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transition: width 0.25s ease;
}

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

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

.btn-industrial-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  background: linear-gradient(135deg, var(--accent-primary) 0%, rgba(var(--accent-primary-rgb), 0.85) 100%);
  color: #04070d;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.98rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.8rem 1.45rem;
  border: 1px solid var(--accent-primary);
  border-radius: var(--card-radius);
  clip-path: var(--btn-clip);
  cursor: pointer;
  transition: all 0.22s ease;
}

.btn-industrial-primary:hover {
  filter: brightness(1.12);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(var(--accent-primary-rgb), 0.32);
}

.btn-industrial-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  background: rgba(15, 23, 42, 0.72);
  color: var(--text-primary);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.8rem 1.35rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--card-radius);
  clip-path: var(--btn-clip);
  cursor: pointer;
  transition: all 0.22s ease;
}

.btn-industrial-secondary:hover {
  border-color: var(--accent-primary);
  background: rgba(var(--accent-primary-rgb), 0.12);
}

/* ==========================================================================
   ELEMENTO CENTRAL: CARRUSEL DE 5 BANNERS ROTATIVOS DE GRAN FORMATO
   ========================================================================== */
.hero-carousel-section {
  position: relative;
  width: 100%;
  min-height: 86vh;
  background: var(--bg-obsidian);
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

.carousel-viewport {
  width: 100%;
  min-height: 86vh;
  overflow: hidden;
  position: relative;
}

.carousel-track {
  display: flex;
  width: 100%;
  min-height: 86vh;
  transition: transform 0.78s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}

.carousel-slide {
  flex: 0 0 100%;
  width: 100%;
  min-height: 86vh;
  position: relative;
  display: flex;
  align-items: center;
  padding: 4.5rem 0 7.5rem 0;
  overflow: hidden;
}

.slide-media-layer {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
}

.slide-bg-video,
.slide-bg-poster {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.03);
  transition: transform 8s ease-out;
}

.carousel-slide.is-active .slide-bg-video {
  transform: scale(1);
}

/* Superposiciones cinematográficas personalizadas por banner */
.slide-scrim {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: 
    linear-gradient(90deg, rgba(7, 11, 18, 0.94) 0%, rgba(7, 11, 18, 0.78) 48%, rgba(7, 11, 18, 0.48) 100%),
    linear-gradient(180deg, rgba(7, 11, 18, 0.55) 0%, transparent 35%, rgba(7, 11, 18, 0.95) 100%);
}

.slide-content-wrapper {
  position: relative;
  z-index: 5;
  width: 100%;
}

.slide-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.75rem;
  align-items: center;
}

.slide-eyebrow-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.38rem 0.85rem;
  background: rgba(var(--accent-primary-rgb), 0.14);
  border-left: 3px solid var(--accent-primary);
  border-top: 1px solid rgba(var(--accent-primary-rgb), 0.3);
  border-right: 1px solid rgba(var(--accent-primary-rgb), 0.3);
  border-bottom: 1px solid rgba(var(--accent-primary-rgb), 0.3);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #ffffff;
  margin-bottom: 1.25rem;
}

.slide-headline {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5.4vw, 4.9rem);
  font-weight: 900;
  line-height: 0.96;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: #ffffff;
  margin-bottom: 1.25rem;
  text-shadow: 0 10px 30px rgba(0, 0, 0, 0.65);
}

.slide-headline .accent-line {
  display: block;
  background: linear-gradient(90deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-top: 0.2rem;
}

.slide-description {
  font-size: clamp(1.05rem, 1.4vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 2rem;
  font-weight: 400;
  line-height: 1.6;
}

.slide-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

/* Paneles derechos diferenciados por cada uno de los 5 banners */
.banner-unique-panel {
  background: rgba(11, 17, 28, 0.82);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 1.6rem;
  border-radius: var(--card-radius);
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.55);
}

.banner-unique-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
}

/* Controles del carrusel fijos en la base del Hero */
.carousel-controls-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 20;
  background: rgba(7, 11, 18, 0.9);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-subtle);
  padding: 0.85rem 0;
}

.carousel-controls-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.carousel-tabs {
  display: grid;
  grid-template-columns: repeat(5, minmax(120px, 1fr));
  gap: 0.5rem;
  flex: 1;
}

.carousel-tab-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  padding: 0.55rem 0.75rem;
  text-align: left;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease;
  color: var(--text-secondary);
}

.carousel-tab-btn:hover {
  border-color: rgba(var(--accent-primary-rgb), 0.5);
  color: #ffffff;
}

.carousel-tab-btn.active {
  background: rgba(var(--accent-primary-rgb), 0.14);
  border-color: var(--accent-primary);
  color: #ffffff;
}

.tab-progress-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  width: 0%;
}

.carousel-action-buttons {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.carousel-ctrl-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.55rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s ease;
}

.carousel-ctrl-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* ==========================================================================
   SECCIONES ESTRUCTURALES DEL WEBSITE
   ========================================================================== */
.section-block {
  padding: 6rem 0;
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-primary);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 3.8vw, 3.4rem);
  font-weight: 800;
  text-transform: uppercase;
  line-height: 1.02;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.section-lead {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 760px;
}

/* Tarjetas industriales y consolas */
.industrial-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--card-radius);
  padding: 1.75rem;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  position: relative;
}

.industrial-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.42);
}

/* Selector interactivo de Subproductos Siderúrgicos */
.byproduct-tab-btn {
  width: 100%;
  text-align: left;
  padding: 1.1rem 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.byproduct-tab-btn:hover {
  background: var(--bg-surface-elevated);
  color: #ffffff;
}

.byproduct-tab-btn.active {
  background: var(--bg-surface-elevated);
  border-color: var(--border-subtle);
  border-left-color: var(--accent-primary);
  color: #ffffff;
  font-weight: 700;
}

/* Responsive */
@media (max-width: 1024px) {
  .slide-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }
  .carousel-tabs {
    grid-template-columns: repeat(2, 1fr);
  }
  .main-nav {
    display: none;
  }
}

@media (max-width: 640px) {
  .carousel-slide {
    padding: 3rem 0 11rem 0;
  }
  .carousel-tabs {
    grid-template-columns: repeat(5, 1fr);
  }
  .carousel-tab-btn .tab-title-text {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .carousel-track,
  .slide-bg-video {
    transition: none !important;
    transform: none !important;
  }
}