/* ============================================
   SBIT Ingeniería — Design System & Styles
   Premium Structural Engineering Website
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Primary palette — dark charcoal/slate → corporate teal */
  --color-primary-900: #0A0F1A; /* body background (deep slate) */
  --color-primary-800: #0F172A; /* slate 900 */
  --color-primary-700: #1A2738; /* cards / nav scrolled */
  --color-primary-600: #24384A;
  --color-primary-500: #3D6065; /* teal-slate transition */
  --color-primary-400: #628C90; /* CORPORATE teal — brand color */
  --color-primary-300: #80A8AC;
  --color-primary-200: #A8C7CA;
  --color-primary-100: #CFE0E2;
  --color-primary-50: #ECF3F3;

  /* Accent — corporate petroleum teal (replaces gold) */
  --color-accent-600: #4E797F;
  --color-accent-500: #6B9EA7; /* CORPORATE accent teal */
  --color-accent-400: #87B4BB;
  --color-accent-300: #A6C9CE;
  --color-accent-200: #C7DDE0;
  --color-accent-100: #E6F1F2;

  /* Neutral */
  --color-neutral-950: #0B0D10;
  --color-neutral-900: #14171D;
  --color-neutral-800: #1E2229;
  --color-neutral-700: #2D3340;
  --color-neutral-600: #4A5568;
  --color-neutral-500: #6B7A8D;
  --color-neutral-400: #8E9BAD;
  --color-neutral-300: #B0BBCA;
  --color-neutral-200: #D1D9E4;
  --color-neutral-100: #E8ECF2;
  --color-neutral-50: #F5F7FA;
  --color-white: #FFFFFF;

  /* Semantic */
  --color-success: #22C55E;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

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

  /* Spacing scale (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.2);
  --shadow-xl: 0 16px 50px rgba(0,0,0,0.25);
  --shadow-glow-blue: 0 0 30px rgba(98,140,144,0.40);
  --shadow-glow-gold: 0 0 30px rgba(107,158,167,0.35);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 900px;
  --nav-height: 80px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-neutral-200);
  background-color: var(--color-primary-900);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

ul, ol { list-style: none; }

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

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-white);
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); letter-spacing: -0.01em; }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); }
h4 { font-size: clamp(1.1rem, 2vw, 1.4rem); }

.text-gradient {
  background: linear-gradient(135deg, var(--color-primary-300), var(--color-accent-400));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-accent { color: var(--color-accent-500); }
.text-muted { color: var(--color-neutral-500); }

.subtitle {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent-500);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.subtitle::before {
  content: '';
  display: inline-block;
  width: 32px;
  height: 2px;
  background: var(--color-accent-500);
}

/* ---------- Layout Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding: var(--space-24) 0;
  position: relative;
}

.section--dark {
  background-color: var(--color-primary-800);
}

.section--darker {
  background-color: var(--color-neutral-950);
}

.grid {
  display: grid;
  gap: var(--space-8);
}

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

.flex {
  display: flex;
  align-items: center;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-header .subtitle {
  justify-content: center;
  margin-bottom: var(--space-4);
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

.section-header p {
  max-width: 650px;
  margin: 0 auto;
  color: var(--color-neutral-400);
  font-size: 1.1rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-primary-500));
  color: var(--color-white);
  box-shadow: var(--shadow-glow-blue);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(98,140,144,0.5);
}

.btn--accent {
  background: linear-gradient(135deg, var(--color-accent-500), var(--color-accent-600));
  color: var(--color-primary-900);
  box-shadow: var(--shadow-glow-gold);
}

.btn--accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(107,158,167,0.5);
}

.btn--outline {
  border: 2px solid var(--color-neutral-600);
  color: var(--color-white);
  background: transparent;
}

.btn--outline:hover {
  border-color: var(--color-primary-400);
  color: var(--color-primary-300);
  background: rgba(98,140,144,0.08);
}

.btn--large {
  padding: var(--space-5) var(--space-10);
  font-size: 1.05rem;
}

.btn .icon {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-fast);
}

.btn:hover .icon {
  transform: translateX(3px);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: all var(--transition-base);
  background: transparent;
}

.nav.scrolled {
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  box-shadow: var(--shadow-lg);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: -0.02em;
}

.nav__logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-accent-500));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 900;
  color: var(--color-white);
}

.nav__logo span {
  color: var(--color-accent-500);
}

/* Corporate logo image — fits the 80px navbar without distortion */
.nav__logo-img {
  height: 60px;
  width: auto;
  display: block;
  object-fit: contain;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav__logo:hover .nav__logo-img {
  transform: scale(1.04);
  opacity: 0.9;
}

.footer__logo-img {
  height: 88px;
  width: auto;
  display: block;
  object-fit: contain;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  padding: var(--space-2) var(--space-4);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-neutral-300);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-white);
  background: rgba(255,255,255,0.06);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 20px;
  height: 2px;
  background: var(--color-accent-500);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base);
}

.nav__link:hover::after,
.nav__link.active::after {
  transform: translateX(-50%) scaleX(1);
}

.nav__cta {
  margin-left: var(--space-4);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  cursor: pointer;
  z-index: 1010;
}

.nav__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.nav__toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------- Top Bar ---------- */
.topbar {
  background: var(--color-primary-800);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  padding: var(--space-2) 0;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1001;
  font-size: 0.82rem;
  transition: transform var(--transition-base);
}

.topbar.hidden {
  transform: translateY(-100%);
}

.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.topbar__contact {
  display: flex;
  gap: var(--space-6);
  color: var(--color-neutral-400);
}

.topbar__contact a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-neutral-400);
}

.topbar__contact a:hover {
  color: var(--color-accent-400);
}

.topbar__social {
  display: flex;
  gap: var(--space-3);
}

.topbar__social a {
  color: var(--color-neutral-500);
  transition: color var(--transition-fast);
}

.topbar__social a:hover {
  color: var(--color-primary-300);
}

body {
  padding-top: calc(var(--nav-height) + 36px);
}

.nav {
  top: 36px;
}

.nav.scrolled + .topbar,
.topbar.hidden {
  transform: translateY(-100%);
}

.nav.scrolled {
  top: 0;
}

/* ---------- Hero Section ---------- */
.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-height) - 36px);
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
  filter: brightness(0.6);
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10,15,26, 0.95) 0%,
    rgba(10, 22, 40, 0.8) 40%,
    rgba(98,140,144, 0.15) 100%
  );
}

.hero__particles {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
}

.hero__particle {
  position: absolute;
  width: 3px;
  height: 3px;
  background: var(--color-primary-400);
  border-radius: 50%;
  opacity: 0;
  animation: particle-float 8s ease-in-out infinite;
}

@keyframes particle-float {
  0%, 100% { opacity: 0; transform: translateY(100vh) scale(0); }
  10% { opacity: 0.6; }
  90% { opacity: 0.6; }
  50% { transform: translateY(-20vh) scale(1); }
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 100%;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(98,140,144, 0.12);
  border: 1px solid rgba(98,140,144, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-primary-300);
  margin-bottom: var(--space-6);
  animation: fadeInDown 0.8s ease-out;
}

.hero__badge .pulse {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 0 rgba(34,197,94,0.5); }
  50% { box-shadow: 0 0 0 8px rgba(34,197,94,0); }
}

.hero h1 {
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero__description {
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--color-neutral-300);
  margin-bottom: var(--space-10);
  max-width: 900px;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

.hero__metrics {
  display: flex;
  gap: var(--space-10);
  margin-top: var(--space-16);
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255,255,255,0.08);
  animation: fadeInUp 0.8s ease-out 0.8s both;
}

.hero__metric {
  text-align: left;
}

.hero__metric-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-white);
  line-height: 1;
  display: flex;
  align-items: baseline;
}

.hero__metric-value .accent {
  color: var(--color-accent-500);
  margin-left: 2px;
}

.hero__metric-label {
  font-size: 0.82rem;
  color: var(--color-neutral-500);
  margin-top: var(--space-1);
}

/* Geometric decorations */
.hero__decoration {
  position: absolute;
  right: -5%;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1;
  opacity: 0.08;
}

.hero__decoration svg {
  width: 500px;
  height: 500px;
}

/* ---------- Stats Section ---------- */
.stats {
  position: relative;
  padding: var(--space-16) 0;
  background: linear-gradient(180deg, var(--color-primary-800) 0%, var(--color-primary-900) 100%);
  overflow: hidden;
}

.stats::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-primary-400), transparent);
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
}

.stat-card {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  position: relative;
}

.stat-card::after {
  content: '';
  position: absolute;
  right: 0;
  top: 20%;
  height: 60%;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(255,255,255,0.08), transparent);
}

.stat-card:last-child::after { display: none; }

.stat-card__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-4);
  background: linear-gradient(135deg, rgba(98,140,144,0.15), rgba(107,158,167,0.1));
  border: 1px solid rgba(98,140,144,0.2);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: all var(--transition-base);
}

.stat-card:hover .stat-card__icon {
  transform: scale(1.1) rotate(5deg);
  border-color: var(--color-accent-500);
  box-shadow: var(--shadow-glow-gold);
}

.stat-card__value {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-white);
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat-card__value .suffix {
  color: var(--color-accent-500);
  font-size: 1.5rem;
}

.stat-card__label {
  font-size: 0.9rem;
  color: var(--color-neutral-400);
  font-weight: 500;
}

/* ---------- About Section ---------- */
.about {
  position: relative;
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.about__image {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 4/3;
}

.about__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.about__image:hover img {
  transform: scale(1.03);
}

.about__image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(10,15,26,0.6));
}

.about__image-badge {
  position: absolute;
  bottom: var(--space-6);
  left: var(--space-6);
  z-index: 2;
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(107,158,167, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.about__image-badge strong {
  font-size: 1.8rem;
  color: var(--color-accent-500);
  font-weight: 800;
  line-height: 1;
}

.about__image-badge span {
  font-size: 0.82rem;
  color: var(--color-neutral-300);
  line-height: 1.3;
}

.about__text h2 {
  margin-bottom: var(--space-6);
}

.about__text p {
  color: var(--color-neutral-300);
  margin-bottom: var(--space-4);
  font-size: 1.05rem;
}

.about__highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.about__highlight {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: rgba(98,140,144, 0.05);
  border: 1px solid rgba(98,140,144, 0.1);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.about__highlight:hover {
  border-color: rgba(98,140,144, 0.3);
  background: rgba(98,140,144, 0.08);
}

.about__highlight-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-primary-600));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.about__highlight h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.about__highlight p {
  font-size: 0.8rem;
  color: var(--color-neutral-500);
  margin-bottom: 0;
}

/* ---------- Services Section ---------- */
.services {
  background: linear-gradient(180deg, var(--color-primary-800) 0%, var(--color-primary-900) 100%);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.service-card {
  background: rgba(14, 23, 38, 0.6);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary-400), var(--color-accent-500));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: rgba(98,140,144, 0.2);
  box-shadow: var(--shadow-xl);
  background: rgba(14, 23, 38, 0.9);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card__icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, rgba(98,140,144,0.15), rgba(98,140,144,0.05));
  border: 1px solid rgba(98,140,144,0.15);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: var(--space-6);
  transition: all var(--transition-base);
}

.service-card:hover .service-card__icon {
  background: linear-gradient(135deg, rgba(98,140,144,0.25), rgba(107,158,167,0.1));
  border-color: rgba(107,158,167,0.3);
  transform: scale(1.05);
}

.service-card h3 {
  font-size: 1.2rem;
  margin-bottom: var(--space-3);
}

.service-card p {
  color: var(--color-neutral-400);
  font-size: 0.92rem;
  margin-bottom: var(--space-6);
  line-height: 1.7;
}

.service-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.service-card__tag {
  padding: var(--space-1) var(--space-3);
  background: rgba(98,140,144,0.08);
  border: 1px solid rgba(98,140,144,0.12);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  color: var(--color-primary-300);
  font-weight: 500;
}

/* ---------- Why Choose Us ---------- */
.why__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.why-card {
  display: flex;
  gap: var(--space-6);
  padding: var(--space-8);
  background: rgba(14, 23, 38, 0.4);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
}

.why-card:hover {
  border-color: rgba(107,158,167, 0.2);
  background: rgba(14, 23, 38, 0.7);
}

.why-card__number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-accent-500), var(--color-accent-600));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-primary-900);
}

.why-card h3 {
  font-size: 1.1rem;
  margin-bottom: var(--space-2);
}

.why-card p {
  color: var(--color-neutral-400);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* ---------- Projects Section ---------- */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.project-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 16/10;
  cursor: pointer;
  group: true;
}

.project-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-card__image {
  transform: scale(1.08);
}

.project-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 30%, rgba(10,15,26,0.95) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-8);
  transition: all var(--transition-base);
}

.project-card:hover .project-card__overlay {
  background: linear-gradient(180deg, rgba(10,15,26,0.3) 0%, rgba(10,15,26,0.95) 80%);
}

.project-card__category {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-400);
  margin-bottom: var(--space-2);
}

.project-card h3 {
  font-size: 1.15rem;
  margin-bottom: var(--space-2);
  transition: color var(--transition-fast);
}

.project-card:hover h3 {
  color: var(--color-primary-300);
}

.project-card p {
  font-size: 0.85rem;
  color: var(--color-neutral-400);
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--transition-base);
}

.project-card:hover p {
  opacity: 1;
  transform: translateY(0);
}

.project-card--featured {
  grid-column: 1 / -1;
  aspect-ratio: 21/9;
}

/* ---------- Testimonials ---------- */
.testimonials {
  background: linear-gradient(180deg, var(--color-primary-800) 0%, var(--color-primary-900) 100%);
}

.testimonials__slider {
  position: relative;
  overflow: hidden;
}

.testimonials__track {
  display: flex;
  transition: transform var(--transition-slow);
}

.testimonial-card {
  flex: 0 0 100%;
  padding: 0 var(--space-4);
}

.testimonial-card__inner {
  background: rgba(14, 23, 38, 0.5);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  text-align: center;
  max-width: 750px;
  margin: 0 auto;
  position: relative;
}

.testimonial-card__quote {
  font-size: 3rem;
  color: var(--color-accent-500);
  opacity: 0.3;
  position: absolute;
  top: var(--space-6);
  left: var(--space-8);
  font-family: Georgia, serif;
  line-height: 1;
}

.testimonial-card__text {
  font-size: 1.15rem;
  color: var(--color-neutral-200);
  line-height: 1.8;
  font-style: italic;
  margin-bottom: var(--space-8);
}

.testimonial-card__author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}

.testimonial-card__avatar {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-accent-500));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-white);
}

.testimonial-card__info h4 {
  font-size: 1rem;
  font-weight: 600;
}

.testimonial-card__info span {
  font-size: 0.85rem;
  color: var(--color-neutral-500);
}

.testimonials__dots {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-8);
}

.testimonials__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-neutral-700);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
}

.testimonials__dot.active {
  background: var(--color-accent-500);
  width: 30px;
  border-radius: var(--radius-full);
}

/* ---------- FAQ Section ---------- */
.faq__list {
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.faq-item {
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-3);
  overflow: hidden;
  transition: all var(--transition-base);
}

.faq-item:hover {
  border-color: rgba(98,140,144, 0.2);
}

.faq-item.active {
  border-color: rgba(98,140,144, 0.3);
  background: rgba(98,140,144, 0.04);
}

.faq-item__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-white);
  text-align: left;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.faq-item__question:hover {
  color: var(--color-primary-300);
}

.faq-item__icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border-radius: 50%;
  background: rgba(98,140,144,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  font-size: 1.2rem;
  color: var(--color-primary-400);
}

.faq-item.active .faq-item__icon {
  transform: rotate(45deg);
  background: rgba(107,158,167,0.15);
  color: var(--color-accent-500);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-base);
}

.faq-item.active .faq-item__answer {
  max-height: 400px;
}

.faq-item__answer-inner {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--color-neutral-400);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ---------- CTA Section ---------- */
.cta {
  position: relative;
  padding: var(--space-20) 0;
  text-align: center;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-primary-700) 0%, var(--color-primary-900) 100%);
}

.cta__glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(98,140,144,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.cta__content {
  position: relative;
  z-index: 2;
}

.cta h2 {
  margin-bottom: var(--space-4);
}

.cta p {
  font-size: 1.1rem;
  color: var(--color-neutral-300);
  max-width: 600px;
  margin: 0 auto var(--space-8);
}

.cta__actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-neutral-950);
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: var(--space-16) 0 var(--space-8);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer__brand p {
  color: var(--color-neutral-500);
  font-size: 0.9rem;
  margin-top: var(--space-4);
  line-height: 1.7;
}

.footer__title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-white);
  margin-bottom: var(--space-5);
}

.footer__links li {
  margin-bottom: var(--space-3);
}

.footer__links a {
  font-size: 0.9rem;
  color: var(--color-neutral-500);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.footer__links a:hover {
  color: var(--color-primary-300);
  transform: translateX(4px);
}

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  font-size: 0.9rem;
  color: var(--color-neutral-400);
}

.footer__contact-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  background: rgba(98,140,144,0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 0.82rem;
  color: var(--color-neutral-600);
}

.footer__legal {
  display: flex;
  gap: var(--space-6);
}

.footer__legal a {
  color: var(--color-neutral-600);
}

.footer__legal a:hover {
  color: var(--color-primary-300);
}

/* ---------- Scroll Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0.05s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.1s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.15s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.2s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.25s; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.3s; }

.stagger-children.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Keyframes ---------- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

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

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

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

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

  .stat-card:nth-child(2)::after { display: none; }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 70px;
  }

  body { padding-top: var(--nav-height); }

  .topbar { display: none; }
  .nav { top: 0; }

  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: rgba(10, 22, 40, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-8);
    transition: right var(--transition-base);
    border-left: 1px solid rgba(255,255,255,0.06);
  }

  .nav__links.open {
    right: 0;
  }

  .nav__link {
    width: 100%;
    text-align: center;
    padding: var(--space-4);
    font-size: 1.1rem;
  }

  .nav__cta {
    margin-left: 0;
    margin-top: var(--space-4);
    width: 100%;
  }

  .nav__cta .btn { width: 100%; }

  .nav__toggle { display: flex; }

  .hero__metrics {
    flex-direction: column;
    gap: var(--space-6);
  }

  .services__grid,
  .why__grid,
  .projects__grid {
    grid-template-columns: 1fr;
  }

  .stats__grid {
    grid-template-columns: 1fr 1fr;
  }

  .about__highlights {
    grid-template-columns: 1fr;
  }

  .project-card--featured {
    aspect-ratio: 16/10;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

  .footer__legal {
    flex-wrap: wrap;
    justify-content: center;
  }

  .section {
    padding: var(--space-16) 0;
  }

  .cta { padding: var(--space-16) 0; }
}

@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
  }

  .hero__actions .btn { width: 100%; }

  .stats__grid {
    grid-template-columns: 1fr;
  }

  .stat-card::after { display: none; }
}

/* ---------- Scroll to top ---------- */
/* ---------- WhatsApp Floating Button ---------- */
.whatsapp-fab {
  position: fixed;
  bottom: calc(var(--space-8) + 64px); /* sits above the scroll-top button */
  right: var(--space-8);
  width: 56px;
  height: 56px;
  background: #25D366;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 24px rgba(37,211,102,0.45);
  z-index: 1000;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.whatsapp-fab:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 32px rgba(37,211,102,0.6);
  color: #fff;
}

.whatsapp-fab svg { display: block; }

@media (max-width: 768px) {
  .whatsapp-fab {
    width: 52px;
    height: 52px;
    bottom: calc(var(--space-6) + 60px);
    right: var(--space-6);
  }
}

.scroll-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-primary-600));
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-glow-blue);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 999;
  border: none;
  cursor: pointer;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 40px rgba(98,140,144,0.5);
}

/* ---------- Loading Screen ---------- */
.loader {
  position: fixed;
  inset: 0;
  background: var(--color-primary-900);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader__bar {
  width: 200px;
  height: 3px;
  background: var(--color-neutral-800);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.loader__progress {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary-400), var(--color-accent-500));
  border-radius: var(--radius-full);
  animation: loading 1.5s ease-in-out forwards;
}

@keyframes loading {
  0% { width: 0%; }
  50% { width: 70%; }
  100% { width: 100%; }
}

/* ============================================
   Metodología de trabajo (sección Servicios)
   ============================================ */
.process {
  margin-top: var(--space-12);
}

.process__heading {
  text-align: center;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 800;
  color: var(--color-neutral-50);
  margin-bottom: var(--space-10);
  letter-spacing: -0.02em;
}

.process__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.process__step {
  background: rgba(14, 23, 38, 0.6);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-6);
  position: relative;
  transition: all var(--transition-base);
}

.process__step:hover {
  border-color: rgba(107,158,167,0.35);
  transform: translateY(-4px);
}

.process__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-accent-500));
  color: var(--color-white);
  font-weight: 800;
  font-size: 1.15rem;
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-glow-blue);
}

.process__step h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-neutral-50);
  margin-bottom: var(--space-2);
}

.process__step p {
  font-size: 0.95rem;
  color: var(--color-neutral-300);
  margin: 0;
}

.process__cta {
  text-align: center;
  margin-top: var(--space-10);
}

@media (max-width: 992px) {
  .process__steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .process__steps { grid-template-columns: 1fr; }
}

/* Enlace "Saber más" en tarjetas de servicio */
.service-card__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: var(--space-4);
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--color-accent-400);
  transition: gap var(--transition-base), color var(--transition-base);
}
.service-card__link:hover { color: var(--color-accent-300); gap: 9px; }

/* Bloque de zonas en el pie (enlazado interno SEO) */
.footer__seo {
  margin-top: var(--space-10);
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255,255,255,0.08);
}
.footer__seo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-5);
}
.footer__seo-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent-400);
  margin-bottom: var(--space-3);
}
.footer__seo .footer__links a { font-size: 0.92rem; }
@media (max-width: 768px) {
  .footer__seo-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer__seo-grid { grid-template-columns: 1fr; }
}

/* Experiencia previa (etapa CEMOSA) en la sección Proyectos */
.exp { margin-top: var(--space-12); }
.exp__heading {
  text-align: center;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 800;
  color: var(--color-neutral-50);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}
.exp__note {
  text-align: center;
  color: var(--color-neutral-300);
  max-width: 60ch;
  margin: 0 auto var(--space-8);
}
.exp__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}
.exp__card {
  background: rgba(14, 23, 38, 0.6);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-xl);
  padding: var(--space-7) var(--space-6);
  transition: all var(--transition-base);
}
.exp__card:hover { border-color: rgba(107,158,167,0.35); transform: translateY(-4px); }
.exp__tag {
  display: inline-block;
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent-400);
  background: rgba(107,158,167,0.12);
  border: 1px solid rgba(107,158,167,0.25);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: var(--space-4);
}
.exp__card h4 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--color-neutral-50);
  margin-bottom: var(--space-3);
  line-height: 1.3;
}
.exp__card p { font-size: 0.94rem; color: var(--color-neutral-300); margin: 0; }
@media (max-width: 900px) { .exp__grid { grid-template-columns: 1fr; } }

/* Metodología con 3 pasos */
.process__steps--3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 768px) { .process__steps--3 { grid-template-columns: 1fr; } }

/* Nosotros sin imagen: una sola columna */
.about__grid--noimg { grid-template-columns: 1fr; max-width: 860px; margin: 0 auto; text-align: left; }

/* Zonas reducidas a tres enlaces */
.footer__seo-grid--three { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-4); }
.footer__seo-grid--three a {
  padding: 10px 20px;
  border: 1px solid rgba(107,158,167,0.3);
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-neutral-200);
}
.footer__seo-grid--three a:hover { border-color: var(--color-accent-400); color: var(--color-accent-400); }

/* ============================================
   Colaboradores (logos sobre chip claro)
   ============================================ */
.collab__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-4);
}
.collab__logo {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base);
}
.collab__logo:hover { transform: translateY(-4px); }
.collab__logo img {
  max-width: 100%;
  max-height: 70px;
  width: auto;
  height: auto;
  object-fit: contain;
}
@media (max-width: 768px) { .collab__grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 460px) { .collab__grid { grid-template-columns: 1fr; } }