/* ═══════════════════════════════════════════════════════════════
   FORXA · Sistema Impermeabilizante · Design System
   ═══════════════════════════════════════════════════════════════ */

/* ─── DESIGN TOKENS ─── */
:root {
  /* Brand Colors */
  --clr-fill: #E8590C;          /* FILL – Naranja Acción */
  --clr-fill-light: #FF7A3D;
  --clr-fill-dark: #C44A08;
  --clr-fill-alpha: rgba(232, 89, 12, 0.15);
  --clr-fill-alpha-strong: rgba(232, 89, 12, 0.3);

  --clr-prime: #3DAA5A;         /* PRIME – Verde Ecosistema */
  --clr-prime-light: #52CC72;
  --clr-prime-dark: #2D8A45;
  --clr-prime-alpha: rgba(61, 170, 90, 0.15);
  --clr-prime-alpha-strong: rgba(61, 170, 90, 0.3);

  --clr-pro: #2563EB;           /* PRO – Azul Tecnológico */
  --clr-pro-light: #3B82F6;
  --clr-pro-dark: #1D4ED8;
  --clr-pro-alpha: rgba(37, 99, 235, 0.15);
  --clr-pro-alpha-strong: rgba(37, 99, 235, 0.3);

  /* Neutral Palette */
  --clr-bg: #0A0D12;
  --clr-bg-2: #10151E;
  --clr-bg-3: #161D2A;
  --clr-surface: #1A2235;
  --clr-surface-2: #1F2A3D;
  --clr-border: rgba(255, 255, 255, 0.08);
  --clr-border-strong: rgba(255, 255, 255, 0.15);

  /* Text */
  --clr-text: #E8EBF0;
  --clr-text-2: #9AAABB;
  --clr-text-3: #5A7080;
  --clr-white: #FFFFFF;

  /* Orange as accent (brand primary) */
  --clr-accent: var(--clr-fill);

  /* Typography */
  --font-heading: 'Outfit', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.6);
  --shadow-accent: 0 0 24px rgba(232, 89, 12, 0.35);

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 150ms;
  --dur-md: 250ms;
  --dur-slow: 400ms;

  /* Layout */
  --container-max: 1200px;
  --navbar-h: 72px;
  --section-py: 5rem;
}

/* ─── RESET ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--navbar-h); }
body {
  font-family: var(--font-body);
  background-color: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
ul { list-style: none; }
input, select, textarea { font-family: inherit; }
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }

/* ─── UTILS ─── */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.5rem;
}
.gradient-text {
  background: linear-gradient(135deg, var(--clr-fill), var(--clr-fill-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.glass-card {
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--clr-border-strong);
  border-radius: var(--radius-xl);
}
.section {
  padding-block: var(--section-py);
  position: relative;
}
.section-header {
  text-align: center;
  max-width: 700px;
  margin-inline: auto;
  margin-bottom: var(--space-3xl);
}
.section-tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--clr-fill);
  background: var(--clr-fill-alpha);
  border: 1px solid var(--clr-fill-alpha-strong);
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}
.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--clr-white);
  margin-bottom: var(--space-md);
}
.section-title--left { text-align: left; }
.section-subtitle {
  font-size: clamp(0.95rem, 2vw, 1.075rem);
  color: var(--clr-text-2);
  line-height: 1.7;
}

/* ─── BUTTONS ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: all var(--dur-md) var(--ease);
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.1);
  opacity: 0;
  transition: opacity var(--dur-fast);
}
.btn:hover::after { opacity: 1; }
.btn:active { transform: scale(0.97); }
.btn--primary {
  background: linear-gradient(135deg, var(--clr-fill), var(--clr-fill-light));
  color: var(--clr-white);
  box-shadow: 0 4px 20px rgba(232, 89, 12, 0.4);
}
.btn--primary:hover {
  box-shadow: 0 6px 28px rgba(232, 89, 12, 0.6);
  transform: translateY(-2px);
}
.btn--outline {
  background: transparent;
  color: var(--clr-white);
  border: 2px solid var(--clr-border-strong);
}
.btn--outline:hover {
  border-color: var(--clr-fill);
  color: var(--clr-fill);
  background: var(--clr-fill-alpha);
}
.btn--wa {
  background: linear-gradient(135deg, #25D366, #1ebe5d);
  color: var(--clr-white);
  box-shadow: 0 4px 16px rgba(37, 211, 102, 0.3);
}
.btn--wa:hover {
  box-shadow: 0 6px 24px rgba(37, 211, 102, 0.5);
  transform: translateY(-2px);
}
.btn--lg { font-size: 1rem; padding: 0.875rem 2rem; }
.btn--sm { font-size: 0.8rem; padding: 0.5rem 1.25rem; }
.btn--full { width: 100%; }

/* ─── NAVBAR ─── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--navbar-h);
  background: rgba(10, 13, 18, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: all var(--dur-slow) var(--ease);
}
.navbar.scrolled {
  background: rgba(10, 13, 18, 0.95);
  border-bottom-color: var(--clr-border);
  box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}
.navbar__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
}
.navbar__logo { display: flex; align-items: center; }
.navbar__logo-img {
  height: 40px;
  width: auto;
  object-fit: contain;
  filter: brightness(0) invert(1);
  transition: filter var(--dur-md);
}
.navbar__menu {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.nav-link {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clr-text-2);
  transition: color var(--dur-fast);
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--clr-fill);
  border-radius: var(--radius-full);
  transition: width var(--dur-md) var(--ease);
}
.nav-link:hover { color: var(--clr-white); }
.nav-link:hover::after { width: 100%; }
.navbar__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.navbar__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-text);
  border-radius: var(--radius-full);
  transition: all var(--dur-md) var(--ease);
}
.navbar__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar__hamburger.open span:nth-child(2) { opacity: 0; }
.navbar__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── HERO ─── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--navbar-h);
}
.hero__bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 20%;
  z-index: 0;
}
.hero__bg-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(to right, rgba(10,13,18,0.97) 45%, rgba(10,13,18,0.5) 80%, rgba(10,13,18,0.25) 100%),
    linear-gradient(to bottom, rgba(10,13,18,0.3) 0%, transparent 30%, rgba(10,13,18,0.8) 100%);
}
.hero__particles {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
}
.particle {
  position: absolute;
  border-radius: 50%;
  background: var(--clr-fill);
  opacity: 0;
  animation: float-up var(--dur, 6s) ease-in infinite;
  animation-delay: var(--delay, 0s);
}
@keyframes float-up {
  0% { opacity: 0; transform: translateY(0) scale(0.3); }
  20% { opacity: 0.4; }
  80% { opacity: 0.2; }
  100% { opacity: 0; transform: translateY(-120px) scale(1); }
}
.hero__content {
  position: relative;
  z-index: 3;
  max-width: 680px;
  padding-block: var(--space-4xl);
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-fill-light);
  background: var(--clr-fill-alpha);
  border: 1px solid var(--clr-fill-alpha-strong);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
  animation: fade-up 0.6s var(--ease) both;
}
.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--clr-fill);
  animation: pulse-dot 2s ease infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}
.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.05;
  color: var(--clr-white);
  margin-bottom: var(--space-lg);
  animation: fade-up 0.6s var(--ease) 0.1s both;
}
.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.175rem);
  color: var(--clr-text-2);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
  animation: fade-up 0.6s var(--ease) 0.2s both;
}
.hero__subtitle strong { color: var(--clr-fill-light); }
.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
  animation: fade-up 0.6s var(--ease) 0.3s both;
}
.stat-badge {
  display: flex;
  flex-direction: column;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--clr-border-strong);
  border-radius: var(--radius-md);
  padding: 0.75rem 1.25rem;
  min-width: 120px;
  backdrop-filter: blur(8px);
}
.stat-badge__number {
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
  line-height: 1;
}
.stat-badge__value {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--clr-fill);
  line-height: 1;
}
.stat-badge__unit {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-fill);
  line-height: 1;
}
.stat-badge__label {
  font-size: 0.7rem;
  color: var(--clr-text-2);
  margin-top: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.hero__ctas {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  animation: fade-up 0.6s var(--ease) 0.4s both;
}
.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
}
.scroll-indicator {
  width: 28px;
  height: 44px;
  border: 2px solid var(--clr-border-strong);
  border-radius: var(--radius-full);
  position: relative;
}
.scroll-indicator::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--clr-fill);
  border-radius: var(--radius-full);
  animation: scroll-dot 2s ease infinite;
}
@keyframes scroll-dot {
  0% { opacity: 1; top: 6px; }
  100% { opacity: 0; top: 22px; }
}

/* ─── SISTEMA ─── */
.sistema { background: var(--clr-bg-2); }
.sistema::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--clr-border-strong), transparent);
}
.sistema__tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-3xl);
  flex-wrap: wrap;
}
.tab-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 1.25rem 2rem;
  border-radius: var(--radius-lg);
  border: 2px solid var(--clr-border);
  background: var(--clr-surface);
  color: var(--clr-text-2);
  cursor: pointer;
  transition: all var(--dur-md) var(--ease);
  min-width: 140px;
  position: relative;
  overflow: hidden;
}
.tab-btn::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  opacity: 0;
  transition: opacity var(--dur-md);
}
.tab-btn.active::before { opacity: 1; }
.tab-btn--fill::before { background: var(--clr-fill); }
.tab-btn--prime::before { background: var(--clr-prime); }
.tab-btn--pro::before { background: var(--clr-pro); }
.tab-btn.active.tab-btn--fill {
  border-color: var(--clr-fill);
  background: var(--clr-fill-alpha);
  color: var(--clr-fill-light);
  box-shadow: 0 0 24px var(--clr-fill-alpha-strong);
}
.tab-btn.active.tab-btn--prime {
  border-color: var(--clr-prime);
  background: var(--clr-prime-alpha);
  color: var(--clr-prime-light);
  box-shadow: 0 0 24px var(--clr-prime-alpha-strong);
}
.tab-btn.active.tab-btn--pro {
  border-color: var(--clr-pro);
  background: var(--clr-pro-alpha);
  color: var(--clr-pro-light);
  box-shadow: 0 0 24px var(--clr-pro-alpha-strong);
}
.tab-btn:hover:not(.active) {
  border-color: var(--clr-border-strong);
  background: var(--clr-surface-2);
  color: var(--clr-text);
  transform: translateY(-2px);
}
.tab-btn__number {
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  opacity: 0.6;
  letter-spacing: 0.1em;
}
.tab-btn__name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: 0.05em;
}
.tab-btn__action {
  font-family: var(--font-heading);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.7;
}
.tab-connector {
  color: var(--clr-text-3);
  display: flex;
  align-items: center;
}
.sistema__panels { position: relative; }
.system-panel {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--space-3xl);
  align-items: center;
  animation: fade-up 0.4s var(--ease) both;
}
.system-panel[hidden] { display: none; }
.system-panel__img-col { display: flex; justify-content: center; }
.system-panel__img-wrap {
  width: 340px;
  height: 340px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.system-panel__img-wrap--fill {
  background: radial-gradient(ellipse at center, var(--clr-fill-alpha-strong), transparent 70%);
  border: 1px solid var(--clr-fill-alpha-strong);
  box-shadow: 0 0 60px var(--clr-fill-alpha);
}
.system-panel__img-wrap--prime {
  background: radial-gradient(ellipse at center, var(--clr-prime-alpha-strong), transparent 70%);
  border: 1px solid var(--clr-prime-alpha-strong);
  box-shadow: 0 0 60px var(--clr-prime-alpha);
}
.system-panel__img-wrap--pro {
  background: radial-gradient(ellipse at center, var(--clr-pro-alpha-strong), transparent 70%);
  border: 1px solid var(--clr-pro-alpha-strong);
  box-shadow: 0 0 60px var(--clr-pro-alpha);
}
.system-panel__product-img {
  width: 88%;
  height: 88%;
  object-fit: contain;
  transition: transform var(--dur-slow) var(--ease);
}
.system-panel__img-wrap:hover .system-panel__product-img { transform: scale(1.04) rotate(-1deg); }
.system-panel__badge {
  display: inline-flex;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}
.system-panel__badge--fill { background: var(--clr-fill-alpha); color: var(--clr-fill-light); border: 1px solid var(--clr-fill-alpha-strong); }
.system-panel__badge--prime { background: var(--clr-prime-alpha); color: var(--clr-prime-light); border: 1px solid var(--clr-prime-alpha-strong); }
.system-panel__badge--pro { background: var(--clr-pro-alpha); color: var(--clr-pro-light); border: 1px solid var(--clr-pro-alpha-strong); }
.system-panel__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  color: var(--clr-white);
  margin-bottom: var(--space-sm);
}
.system-panel__title--fill span { color: var(--clr-fill); }
.system-panel__title--prime span { color: var(--clr-prime); }
.system-panel__title--pro span { color: var(--clr-pro-light); }
.system-panel__tagline {
  font-size: 0.95rem;
  color: var(--clr-text-3);
  font-style: italic;
  margin-bottom: var(--space-lg);
}
.system-panel__description {
  font-size: 1rem;
  color: var(--clr-text-2);
  line-height: 1.75;
  margin-bottom: var(--space-xl);
}
.spec-list { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: var(--space-xl); }
.spec-list__item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--clr-text);
}
.spec-list__item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  stroke: var(--clr-fill);
}
.system-panel__tags { display: flex; flex-wrap: wrap; gap: var(--space-sm); }
.tag {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--clr-text-2);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-strong);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
}

/* ─── PRODUCTOS ─── */
.productos { background: var(--clr-bg); }
.productos__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}
.producto-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  position: relative;
  overflow: hidden;
  transition: all var(--dur-md) var(--ease);
  cursor: default;
}
.producto-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}
.producto-card--fill:hover { border-color: var(--clr-fill); box-shadow: 0 20px 60px var(--clr-fill-alpha-strong); }
.producto-card--prime:hover { border-color: var(--clr-prime); box-shadow: 0 20px 60px var(--clr-prime-alpha-strong); }
.producto-card--pro:hover { border-color: var(--clr-pro); box-shadow: 0 20px 60px var(--clr-pro-alpha-strong); }
.producto-card__accent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}
.producto-card--fill .producto-card__accent { background: linear-gradient(90deg, var(--clr-fill), var(--clr-fill-light)); }
.producto-card--prime .producto-card__accent { background: linear-gradient(90deg, var(--clr-prime), var(--clr-prime-light)); }
.producto-card--pro .producto-card__accent { background: linear-gradient(90deg, var(--clr-pro), var(--clr-pro-light)); }
.producto-card__step {
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--clr-text-3);
  text-transform: uppercase;
}
.producto-card__img-wrap {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.02);
}
.producto-card__img {
  max-height: 100%;
  max-width: 100%;
  object-fit: contain;
  transition: transform var(--dur-slow) var(--ease);
}
.producto-card:hover .producto-card__img { transform: scale(1.05); }
.producto-card__body { flex: 1; }
.producto-card__title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--clr-white);
  margin-bottom: 0.25rem;
}
.producto-card--fill .producto-card__title span { color: var(--clr-fill); }
.producto-card--prime .producto-card__title span { color: var(--clr-prime); }
.producto-card--pro .producto-card__title span { color: var(--clr-pro-light); }
.producto-card__action {
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}
.producto-card--fill .producto-card__action { color: var(--clr-fill); }
.producto-card--prime .producto-card__action { color: var(--clr-prime); }
.producto-card--pro .producto-card__action { color: var(--clr-pro-light); }
.producto-card__desc { font-size: 0.875rem; color: var(--clr-text-2); margin-bottom: var(--space-md); }
.producto-card__features {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.producto-card__features li {
  font-size: 0.8rem;
  color: var(--clr-text-3);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.producto-card__features li::before { content: '—'; color: var(--clr-border-strong); }

/* ─── COMMERCE BLOCK (selector + precio + qty + comprar) ─── */
.producto-card__commerce {
  border-top: 1px solid var(--clr-border);
  padding-top: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* Size toggle */
.size-selector {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}
.size-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--clr-border-strong);
  background: var(--clr-bg-3);
  color: var(--clr-text-3);
  cursor: pointer;
  transition: all var(--dur-md) var(--ease);
  font-family: var(--font-heading);
}
.size-btn__icon { font-size: 1.1rem; }
.size-btn__name { font-size: 0.78rem; font-weight: 700; }
.size-btn__vol  { font-size: 0.65rem; opacity: 0.65; letter-spacing: 0.04em; }
.size-btn:hover { border-color: var(--clr-border-strong); color: var(--clr-text); background: var(--clr-surface-2); }

/* Active states per product color */
.size-btn--fill.active  { border-color: var(--clr-fill);  color: var(--clr-fill-light);  background: var(--clr-fill-alpha);  box-shadow: 0 0 12px var(--clr-fill-alpha-strong); }
.size-btn--prime.active { border-color: var(--clr-prime); color: var(--clr-prime-light); background: var(--clr-prime-alpha); box-shadow: 0 0 12px var(--clr-prime-alpha-strong); }
.size-btn--pro.active   { border-color: var(--clr-pro);   color: var(--clr-pro-light);   background: var(--clr-pro-alpha);   box-shadow: 0 0 12px var(--clr-pro-alpha-strong); }

/* Price display */
.price-display {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 0.65rem 1rem;
}
.price-display__label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-text-3);
}
.price-display__amount {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--clr-white);
  transition: all var(--dur-md) var(--ease);
  letter-spacing: -0.01em;
}
.price-display__amount.flip {
  animation: price-flip 0.28s var(--ease) both;
}
@keyframes price-flip {
  0%   { opacity: 0; transform: translateY(-8px) scale(0.92); }
  100% { opacity: 1; transform: translateY(0)    scale(1);    }
}

/* Quantity + total row */
.qty-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}
.qty-control {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--clr-bg-3);
  border: 1px solid var(--clr-border-strong);
  border-radius: var(--radius-full);
  padding: 0.2rem 0.4rem;
}
.qty-btn {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-text-2);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: color var(--dur-fast), background var(--dur-fast);
  line-height: 1;
}
.qty-btn:hover { color: var(--clr-white); background: rgba(255,255,255,0.08); }
.qty-btn:active { transform: scale(0.88); }
.qty-value {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--clr-white);
  min-width: 1.6rem;
  text-align: center;
}
.qty-total {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--clr-text-2);
}

/* Buy button */
.btn--buy {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-family: var(--font-heading);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--dur-md) var(--ease);
  position: relative;
  overflow: hidden;
}
.btn--buy::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.12);
  opacity: 0;
  transition: opacity var(--dur-fast);
}
.btn--buy:hover::before { opacity: 1; }
.btn--buy:hover { transform: translateY(-2px); }
.btn--buy:active { transform: scale(0.97); }

.btn--buy--fill  { background: linear-gradient(135deg, #25D366, #1ebe5d); color: #fff; box-shadow: 0 4px 18px rgba(37,211,102,0.32); }
.btn--buy--fill:hover  { box-shadow: 0 6px 28px rgba(37,211,102,0.5); }
.btn--buy--prime { background: linear-gradient(135deg, #25D366, #1ebe5d); color: #fff; box-shadow: 0 4px 18px rgba(37,211,102,0.32); }
.btn--buy--prime:hover { box-shadow: 0 6px 28px rgba(37,211,102,0.5); }
.btn--buy--pro   { background: linear-gradient(135deg, #25D366, #1ebe5d); color: #fff; box-shadow: 0 4px 18px rgba(37,211,102,0.32); }
.btn--buy--pro:hover   { box-shadow: 0 6px 28px rgba(37,211,102,0.5); }

.btn--outline--fill:hover {
  border-color: var(--clr-fill);
  color: var(--clr-fill-light);
  background: var(--clr-fill-alpha);
}
.btn--outline--prime:hover {
  border-color: var(--clr-prime);
  color: var(--clr-prime-light);
  background: var(--clr-prime-alpha);
}
.btn--outline--pro:hover {
  border-color: var(--clr-pro);
  color: var(--clr-pro-light);
  background: var(--clr-pro-alpha);
}


/* ─── CALCULADORA ─── */
.calculadora { background: var(--clr-bg-2); }
.calculadora__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}
.calculadora__form-card {
  padding: var(--space-2xl);
}
.calc-form__title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-white);
  margin-bottom: var(--space-xl);
}
.form-group { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: var(--space-lg); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clr-text);
}
.input-wrapper { position: relative; display: flex; align-items: center; }
.form-input {
  width: 100%;
  background: var(--clr-bg-3);
  border: 1px solid var(--clr-border-strong);
  border-radius: var(--radius-md);
  color: var(--clr-white);
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  outline: none;
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
}
.form-input:focus {
  border-color: var(--clr-fill);
  box-shadow: 0 0 0 3px var(--clr-fill-alpha);
}
.form-input::placeholder { color: var(--clr-text-3); }
.input-unit {
  position: absolute;
  right: 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clr-text-3);
  pointer-events: none;
}
.form-help { font-size: 0.75rem; color: var(--clr-text-3); }
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%235A7080' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}
.form-select option { background: var(--clr-bg-3); }
.form-textarea { resize: vertical; min-height: 100px; }
.radio-group { display: flex; flex-direction: column; gap: var(--space-sm); }
.radio-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--clr-bg-3);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--dur-fast);
}
.radio-option:hover { border-color: var(--clr-fill-alpha-strong); }
.radio-option input[type="radio"] { display: none; }
.radio-custom {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--clr-border-strong);
  flex-shrink: 0;
  position: relative;
  transition: border-color var(--dur-fast);
}
.radio-custom::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%) scale(0);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--clr-fill);
  transition: transform var(--dur-md) var(--ease-bounce);
}
.radio-option input:checked ~ .radio-custom { border-color: var(--clr-fill); }
.radio-option input:checked ~ .radio-custom::after { transform: translate(-50%,-50%) scale(1); }
.radio-option input:checked ~ .radio-label strong { color: var(--clr-fill-light); }
.radio-label { display: flex; flex-direction: column; }
.radio-label strong { font-size: 0.875rem; color: var(--clr-text); }
.radio-label small { font-size: 0.75rem; color: var(--clr-text-3); }
.capas-selector {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}
.capas-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 2px solid var(--clr-border-strong);
  background: var(--clr-surface);
  color: var(--clr-text);
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--dur-fast);
}
.capas-btn:hover { border-color: var(--clr-fill); color: var(--clr-fill); }
.capas-value {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--clr-fill);
  min-width: 2rem;
  text-align: center;
}
.checkbox-option {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--clr-text-2);
}
.checkbox-option input[type="checkbox"] { display: none; }
.checkbox-custom {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 2px solid var(--clr-border-strong);
  flex-shrink: 0;
  position: relative;
  margin-top: 1px;
  transition: border-color var(--dur-fast), background var(--dur-fast);
}
.checkbox-custom::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 5px;
  width: 5px;
  height: 9px;
  border-right: 2px solid white;
  border-bottom: 2px solid white;
  transform: rotate(45deg) scale(0);
  transition: transform var(--dur-md) var(--ease-bounce);
}
.checkbox-option input:checked ~ .checkbox-custom { background: var(--clr-fill); border-color: var(--clr-fill); }
.checkbox-option input:checked ~ .checkbox-custom::after { transform: rotate(45deg) scale(1); }
.calculadora__results {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  position: sticky;
  top: calc(var(--navbar-h) + 1rem);
}
.calc-results__placeholder {
  text-align: center;
  color: var(--clr-text-3);
}
.placeholder-icon {
  margin-inline: auto;
  margin-bottom: var(--space-md);
  opacity: 0.3;
  width: fit-content;
}
.calc-results__placeholder p { font-size: 0.9rem; line-height: 1.7; }
.calc-results__content { width: 100%; }
.results-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--clr-white);
  margin-bottom: 0.25rem;
}
.results-area { font-size: 0.875rem; color: var(--clr-text-3); margin-bottom: var(--space-lg); }
.results-area strong { color: var(--clr-fill-light); }
.results-products { display: flex; flex-direction: column; gap: var(--space-md); margin-bottom: var(--space-lg); }
.result-product {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  border-left: 3px solid;
}
.result-product--fill { background: var(--clr-fill-alpha); border-color: var(--clr-fill); }
.result-product--prime { background: var(--clr-prime-alpha); border-color: var(--clr-prime); }
.result-product--pro { background: var(--clr-pro-alpha); border-color: var(--clr-pro); }
.result-product__header {
  display: flex;
  flex-direction: column;
  min-width: 80px;
}
.result-product__step {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--clr-text-3);
}
.result-product__name {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--clr-text);
}
.result-product__qty { display: flex; align-items: baseline; gap: 0.4rem; flex: 1; }
.result-qty__num {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 900;
  color: var(--clr-white);
}
.result-qty__unit { font-size: 0.75rem; color: var(--clr-text-3); }
.result-product__note { font-size: 0.7rem; color: var(--clr-text-3); }
.eco-impact-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: var(--clr-prime-alpha);
  border: 1px solid var(--clr-prime-alpha-strong);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
}
.eco-impact-card__icon {
  font-size: 1.75rem;
  flex-shrink: 0;
}
.eco-impact-card__label { font-size: 0.75rem; color: var(--clr-prime-light); margin-bottom: 0.2rem; }
.eco-impact-card__value { font-family: var(--font-heading); font-size: 1rem; font-weight: 700; color: var(--clr-white); }

/* ─── SOSTENIBILIDAD ─── */
.sostenibilidad { background: var(--clr-bg); }
.sostenibilidad__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

/* Eco Cycle — new linear flow */
.eco-cycle {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2xl);
}
.eco-cycle__center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-align: center;
  position: relative;
  padding: var(--space-xl);
}
.eco-cycle__center::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  width: 130px;
  height: 130px;
  margin: auto;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-strong);
  box-shadow: 0 0 40px rgba(61,170,90,0.08);
  z-index: 0;
}
.eco-cycle__logo {
  width: 70px;
  object-fit: contain;
  filter: brightness(0) invert(1);
  position: relative;
  z-index: 1;
}
.eco-cycle__center span {
  font-size: 0.65rem;
  color: var(--clr-text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  position: relative;
  z-index: 1;
}

/* Flow — horizontal on desktop */
.eco-flow {
  display: flex;
  align-items: center;
  gap: 0;
  width: 100%;
}
.eco-flow__step {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.6rem;
  padding: var(--space-lg) var(--space-sm);
  border-radius: var(--radius-lg);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  transition: border-color var(--dur-md) var(--ease), box-shadow var(--dur-md) var(--ease);
}
.eco-flow__step:hover {
  border-color: var(--clr-prime-alpha-strong);
  box-shadow: 0 0 20px rgba(61,170,90,0.1);
}
.eco-flow__icon {
  font-size: 1.6rem;
  background: var(--clr-bg-3);
  border: 1px solid var(--clr-border-strong);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.eco-flow__label {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.eco-flow__label strong {
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--clr-text);
}
.eco-flow__label span {
  font-size: 0.68rem;
  color: var(--clr-text-3);
  line-height: 1.3;
}
.eco-flow__arrow {
  flex-shrink: 0;
  width: 28px;
  color: var(--clr-prime);
  opacity: 0.5;
  display: flex;
  align-items: center;
  justify-content: center;
}
.eco-flow__arrow svg {
  width: 20px;
  height: 20px;
}

.eco-stats-col { display: flex; flex-direction: column; gap: var(--space-lg); }
.eco-stat-card {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.eco-stat-card__num {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 900;
  color: var(--clr-prime);
  line-height: 1;
}
.eco-stat-card__unit {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-prime);
}
.eco-stat-card__label { font-size: 0.875rem; color: var(--clr-text-2); }
.eco-cert-card { padding: var(--space-xl); }
.eco-cert-card__title {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--clr-white);
  margin-bottom: var(--space-md);
}
.cert-badges { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-bottom: var(--space-md); }
.cert-badge {
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--clr-prime-light);
  background: var(--clr-prime-alpha);
  border: 1px solid var(--clr-prime-alpha-strong);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}
.eco-cert-card__desc { font-size: 0.85rem; color: var(--clr-text-2); line-height: 1.65; }

/* ─── COMPARATIVA ─── */
.comparativa { background: var(--clr-bg-2); }
.comparativa__table-wrap { overflow-x: auto; border-radius: var(--radius-xl); }
.comp-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.comp-table th, .comp-table td {
  padding: 1rem 1.25rem;
  text-align: left;
  border-bottom: 1px solid var(--clr-border);
}
.comp-table thead tr {
  background: var(--clr-surface);
}
.comp-table th {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-text-2);
}
.comp-table__forxa {
  color: var(--clr-fill) !important;
  background: var(--clr-fill-alpha) !important;
}
.comp-table th.comp-table__forxa { color: var(--clr-fill-light) !important; }
.comp-table td.comp-table__forxa { font-weight: 600; }
.comp-table .comp-table__asfalto { color: var(--clr-text-3) !important; }
.comp-table .comp-table__acrilico { color: var(--clr-text-3) !important; }
.comp-table .comp-table__no { background: rgba(255,80,80,0.05) !important; }
.comp-table .comp-table__partial { background: rgba(255,200,0,0.04) !important; }
.comp-table tbody tr:hover { background: rgba(255,255,255,0.02); }
.comp-check { color: var(--clr-fill); font-weight: 700; margin-right: 0.3rem; }
.comp-x { color: #F87171; font-weight: 700; margin-right: 0.3rem; }
.comp-partial { color: #FBBF24; font-weight: 700; margin-right: 0.3rem; }

/* ─── GARANTIA ─── */
.garantia { background: var(--clr-bg); }
.garantia__layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-3xl);
  align-items: center;
}
.garantia__img-col { position: relative; }
.garantia__img {
  width: 100%;
  border-radius: var(--radius-xl);
  object-fit: cover;
  height: 520px;
}
.garantia__img-badge {
  position: absolute;
  bottom: -1.5rem;
  right: -1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, var(--clr-fill-dark), var(--clr-fill)) !important;
  border-color: var(--clr-fill) !important;
}
.garantia-badge__num {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 900;
  color: var(--clr-white);
  line-height: 1;
}
.garantia-badge__text {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(255,255,255,0.85);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.garantia__info-col { display: flex; flex-direction: column; gap: var(--space-xl); }
.garantia__lead { font-size: 1.05rem; color: var(--clr-text-2); line-height: 1.75; }
.cert-list { display: flex; flex-direction: column; gap: var(--space-lg); }
.cert-item {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  transition: border-color var(--dur-md);
}
.cert-item:hover { border-color: var(--clr-fill-alpha-strong); }
.cert-item__icon { font-size: 1.5rem; flex-shrink: 0; }
.cert-item strong { display: block; font-size: 0.95rem; color: var(--clr-white); margin-bottom: 0.35rem; }
.cert-item p { font-size: 0.85rem; color: var(--clr-text-2); line-height: 1.6; }

/* ─── CONTACTO ─── */
.contacto { background: var(--clr-bg-2); }
.contacto__layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}
.contacto__form { padding: var(--space-2xl); }
.contact-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  padding: var(--space-lg) var(--space-xl);
}
.contacto__info-col { display: flex; flex-direction: column; gap: var(--space-lg); }
.contact-card__icon {
  color: var(--clr-fill);
  flex-shrink: 0;
  margin-top: 0.2rem;
}
.contact-card strong { display: block; font-size: 0.95rem; color: var(--clr-white); margin-bottom: 0.35rem; }
.contact-card p { font-size: 0.85rem; color: var(--clr-text-2); line-height: 1.6; margin-bottom: var(--space-sm); }
.contact-link {
  font-size: 0.85rem;
  color: var(--clr-fill-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.form-success {
  text-align: center;
  padding: var(--space-md);
  background: var(--clr-prime-alpha);
  border: 1px solid var(--clr-prime-alpha-strong);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--clr-prime-light);
}
.form-group--check { flex-direction: row; align-items: flex-start; }

/* ─── FOOTER ─── */
.footer {
  background: var(--clr-bg);
  border-top: 1px solid var(--clr-border);
  padding-top: var(--space-3xl);
}
.footer__inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  padding-bottom: var(--space-3xl);
}
.footer__logo {
  height: 36px;
  object-fit: contain;
  filter: brightness(0) invert(1);
  margin-bottom: var(--space-md);
}
.footer__tagline {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--clr-fill);
  margin-bottom: var(--space-sm);
  font-style: italic;
}
.footer__mission { font-size: 0.8rem; color: var(--clr-text-3); line-height: 1.65; }
.footer__links {
  grid-column: span 3;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}
.footer__col h4 {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-text-2);
  margin-bottom: var(--space-md);
}
.footer__col a {
  display: block;
  font-size: 0.85rem;
  color: var(--clr-text-3);
  margin-bottom: 0.5rem;
  transition: color var(--dur-fast);
}
.footer__col a:hover { color: var(--clr-fill-light); }
.footer__bottom {
  border-top: 1px solid var(--clr-border);
  padding-block: var(--space-lg);
  text-align: center;
}
.footer__bottom p {
  font-size: 0.75rem;
  color: var(--clr-text-3);
}
.footer__bottom p + p { margin-top: 0.25rem; }

/* ─── BACK TO TOP ─── */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-fill), var(--clr-fill-light));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-accent);
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: all var(--dur-md) var(--ease);
  z-index: 900;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}
.back-to-top:hover { transform: translateY(-4px); box-shadow: 0 8px 32px rgba(232, 89, 12, 0.5); }

/* ─── ANIMATIONS ─── */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ─── RESPONSIVE ─── */
@media (max-width: 1024px) {
  .footer__inner { grid-template-columns: 1fr; }
  .footer__links { grid-column: 1; }
  .garantia__layout { grid-template-columns: 1fr; }
  .garantia__img { height: 350px; }
  .garantia__img-badge { right: 1rem; bottom: -1rem; }
  .sostenibilidad__layout { grid-template-columns: 1fr; }
  .eco-flow {
    flex-direction: column;
    gap: 0;
  }
  .eco-flow__arrow {
    transform: rotate(90deg);
    width: 24px;
    height: 24px;
    margin: 0.25rem 0;
  }
  .eco-flow__step {
    width: 100%;
    flex-direction: row;
    text-align: left;
    padding: var(--space-md) var(--space-lg);
    gap: var(--space-md);
  }
  .eco-flow__label {
    align-items: flex-start;
  }
}

@media (max-width: 900px) {
  :root { --section-py: 3.5rem; }
  .navbar__menu { display: none; }
  .navbar__hamburger { display: flex; }
  .navbar__menu.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--navbar-h);
    left: 0;
    right: 0;
    background: rgba(10,13,18,0.98);
    backdrop-filter: blur(20px);
    padding: var(--space-xl);
    gap: var(--space-lg);
    border-bottom: 1px solid var(--clr-border);
    align-items: flex-start;
  }
  .sistema__tabs { gap: var(--space-sm); }
  .tab-btn { min-width: 100px; padding: 1rem 1.25rem; }
  .system-panel { grid-template-columns: 1fr; }
  .system-panel__img-col { order: -1; }
  .system-panel__img-wrap { width: 260px; height: 260px; }
  .productos__grid { grid-template-columns: 1fr; }
  .calculadora__layout { grid-template-columns: 1fr; }
  .calculadora__results { position: static; }
  .contacto__layout { grid-template-columns: 1fr; }
  .hero__stats { flex-direction: column; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  :root { --section-py: 2.5rem; }
  .hero__ctas { flex-direction: column; }
  .btn--lg { width: 100%; }
  .comp-table { font-size: 0.8rem; }
  .comp-table th, .comp-table td { padding: 0.75rem; }
  .footer__links { grid-template-columns: 1fr; }
}