/* =============================================
   HATUM KILLA - Mobile-First CSS
   Base: 375px → 768px → 1024px → 1440px
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Poppins:wght@600;700;800&display=swap');

/* --- DESIGN TOKENS --- */
:root {
  --navy:       #0A192F;
  --navy-mid:   #173459;
  --steel:      #334155;
  --brand-blue:     #0A66C2;
  --brand-blue-dk:  #004182;
  --accent-orange:  #F97316;
  --accent-orange-dk: #EA580C;
  --white:      #FFFFFF;
  --grey-100:   #F1F5F9;
  --grey-200:   #E2E8F0;
  --grey-500:   #64748B;
  --text:       #0F172A;

  --font-head: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;

  --radius-sm:  8px;
  --radius-md:  16px;
  --radius-lg:  24px;
  --radius-xl:  32px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.12);
  --shadow-md:  0 4px 16px rgba(0,0,0,.10);
  --shadow-lg:  0 12px 40px rgba(0,0,0,.14);

  --ease:       cubic-bezier(.4,0,.2,1);
  --t-fast:     180ms var(--ease);
  --t-med:      350ms var(--ease);
  --t-slow:     520ms var(--ease);

  /* Touch Target */
  --tap:        44px;
}

/* --- RESET --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-tap-highlight-color: transparent; }
body {
  font-family: var(--font-body);
  font-size: clamp(16px, 4vw, 18px);
  color: var(--text);
  background: var(--white);
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

/* --- TYPOGRAPHY --- */
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.15; }
h1 { font-size: clamp(2rem, 7vw, 3.8rem); }
h2 { font-size: clamp(1.6rem, 5vw, 2.8rem); }
h3 { font-size: clamp(1.1rem, 3.5vw, 1.4rem); }
p  { line-height: 1.7; color: var(--grey-500); }

/* --- SCROLL REVEAL --- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--t-slow), transform var(--t-slow);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* Hero elements: revealed immediately via animation, not IntersectionObserver */
.hero .reveal {
  opacity: 0;
  animation: fadeUpIn var(--t-slow) forwards;
}
.hero .reveal:nth-child(1) { animation-delay: 0ms; }
.hero .reveal:nth-child(2) { animation-delay: 150ms; }
.hero .reveal:nth-child(3) { animation-delay: 300ms; }

@keyframes fadeUpIn {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: none; }
}

/* --- LAYOUT HELPERS --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 1.25rem;
}
@media (min-width: 768px)  { .container { padding-inline: 2rem; } }
@media (min-width: 1024px) { .container { padding-inline: 3rem; } }

section { padding-block: 4rem; }
@media (min-width: 768px) { section { padding-block: 6rem; } }

/* ===================== NAVIGATION ===================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 900;
  background: rgba(15,23,42,.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,.06);
  transition: transform var(--t-med);
}
.site-header.is-hidden { transform: translateY(-110%); }

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
  padding-inline: 1.25rem;
  max-width: 1200px;
  margin-inline: auto;
}
@media (min-width: 768px) { .nav-inner { min-height: 72px; padding-inline: 2rem; } }

.logo {
  display: flex;
  align-items: center;
  gap: .5rem;
  color: var(--white);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -.5px;
}
.logo svg { width: 28px; height: 28px; color: var(--brand-blue); }

/* Desktop nav links */
.nav-links {
  display: none;
  gap: 2rem;
  align-items: center;
}
.nav-links a {
  color: rgba(255,255,255,.8);
  font-weight: 500;
  font-size: .9rem;
  min-height: var(--tap);
  display: flex;
  align-items: center;
  transition: color var(--t-fast);
}
.nav-links a:hover, .nav-links a:focus { color: var(--brand-blue); }
@media (min-width: 1024px) { .nav-links { display: flex; } }

.nav-cta-btn {
  background: var(--accent-orange);
  color: var(--white) !important;
  padding: 0 1.2rem;
  border-radius: 50px;
  font-weight: 600 !important;
}
.nav-cta-btn:hover { background: var(--accent-orange-dk) !important; }

/* Hamburger button */
.nav-hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: var(--tap);
  height: var(--tap);
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  border-radius: var(--radius-sm);
  transition: background var(--t-fast);
}
.nav-hamburger:hover { background: rgba(255,255,255,.08); }
.nav-hamburger span {
  display: block;
  height: 2px;
  width: 22px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--t-med);
  transform-origin: center;
}
.nav-hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.is-open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (min-width: 1024px) { .nav-hamburger { display: none; } }

/* Mobile drawer overlay */
.nav-drawer {
  position: fixed;
  inset: 0;
  z-index: 800;
  background: var(--navy);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  transform: translateX(100%);
  transition: transform var(--t-med);
}
.nav-drawer.is-open { transform: none; }
.nav-drawer a {
  color: var(--white);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.4rem, 5vw, 2rem);
  min-height: var(--tap);
  display: flex;
  align-items: center;
  transition: color var(--t-fast);
}
.nav-drawer a:hover { color: var(--brand-blue); }
.nav-drawer .drawer-cta {
  background: var(--accent-orange);
  padding: .75rem 2.5rem;
  border-radius: 50px;
  font-size: 1.1rem;
  margin-top: 1rem;
}
.nav-drawer .drawer-cta:hover { background: var(--accent-orange-dk); }

/* ===================== HERO ===================== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-block: 6rem 4rem;
  background-color: var(--navy);
  color: var(--white);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('hatum_killa_hero_industrial_engineering_1774244720256.png');
  background-size: cover;
  background-position: center;
  opacity: .28;
  z-index: 0;
}
.hero-glow {
  position: absolute;
  width: 500px; height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(10,102,194,.25) 0%, transparent 70%);
  top: -100px; right: -100px;
  z-index: 0;
}
.hero .container { position: relative; z-index: 1; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  background: rgba(10,102,194,.15);
  border: 1px solid rgba(10,102,194,.35);
  color: var(--brand-blue);
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  padding: .4rem .9rem;
  border-radius: 50px;
  margin-bottom: 1.5rem;
}

.hero h1 {
  color: var(--white);
  max-width: 14ch;
  margin-bottom: 1.25rem;
}
.hero h1 span { color: var(--brand-blue); }
.hero p {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: rgba(255,255,255,.75);
  max-width: 55ch;
  margin-bottom: 2.5rem;
}
.hero-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* --- BUTTONS --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  min-height: var(--tap);
  padding: 0 1.75rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: .95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
  white-space: nowrap;
}
.btn:focus-visible { outline: 3px solid var(--brand-blue); outline-offset: 3px; }

.btn-primary {
  background: var(--accent-orange);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(249,115,22,.4);
}
.btn-primary:hover { background: var(--accent-orange-dk); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(249,115,22,.3); }
.btn-primary:active { transform: translateY(0); }

.btn-outline {
  border-color: rgba(255,255,255,.5);
  color: var(--white);
}
.btn-outline:hover { border-color: var(--white); background: rgba(255,255,255,.07); }

.btn-solid {
  background: var(--navy);
  color: var(--white);
}
.btn-solid:hover { background: var(--navy-mid); }

/* ===================== SINERGIA ===================== */
.sinergia { background: var(--grey-100); }

.sinergia-grid {
  display: grid;
  gap: 2.5rem;
}
@media (min-width: 768px) { .sinergia-grid { grid-template-columns: 1fr 1fr; align-items: center; } }
@media (min-width: 1024px) { .sinergia-grid { grid-template-columns: 1.1fr 1fr; gap: 5rem; } }

.section-label {
  display: inline-block;
  color: var(--brand-blue);
  font-weight: 700;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: 2.5px;
  margin-bottom: .75rem;
}
.sinergia h2 { margin-bottom: 1.25rem; }
.sinergia p { margin-bottom: 1rem; }

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}
.stat-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 1.25rem 1rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border-top: 3px solid var(--brand-blue);
}
.stat-card strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1.8rem;
  color: var(--navy);
}
.stat-card span { font-size: .8rem; color: var(--grey-500); }

.sinergia-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.sinergia-visual img { width: 100%; height: auto; object-fit: cover; }
.sinergia-badge {
  position: absolute;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--brand-blue);
  color: var(--white);
  font-weight: 700;
  font-size: .85rem;
  padding: .6rem 1.1rem;
  border-radius: 50px;
}

/* ===================== SERVICIOS ===================== */
.servicios { background: var(--white); }
.servicios .section-header { text-align: center; max-width: 700px; margin-inline: auto; margin-bottom: 3rem; }
.servicios .section-header p { margin-top: .75rem; }

.services-grid {
  display: grid;
  gap: 1.25rem;
}
@media (min-width: 768px) { .services-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .services-grid { grid-template-columns: repeat(3, 1fr); } }

.service-card {
  background: var(--grey-100);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  border: 1px solid var(--grey-200);
  display: flex;
  flex-direction: column;
  gap: .75rem;
  transition: transform var(--t-med), box-shadow var(--t-med), border-color var(--t-med);
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }

.service-badge {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: .3rem .7rem;
  border-radius: 50px;
  width: fit-content;
}
.badge-infra { background: rgba(30,58,95,.1); color: var(--navy-mid); }
.badge-energy { background: rgba(10,102,194,.1); color: var(--brand-blue-dk); }

.service-icon {
  width: 48px; height: 48px;
  background: var(--white);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  color: var(--navy-mid);
}
.badge-energy ~ .service-icon { color: var(--brand-blue); }

.service-card h3 { font-size: 1.05rem; color: var(--navy); margin-top: .25rem; }
.service-card p { font-size: .9rem; flex: 1; }

/* ===================== CONFIANZA/CAROUSEL ===================== */
.confianza { background: var(--navy); color: var(--white); overflow: hidden; }
.confianza .section-header { text-align: center; margin-bottom: 3rem; color: var(--white); }
.confianza .section-label { color: rgba(10,102,194,.9); }
.confianza h2 { color: var(--white); }
.confianza p { color: rgba(255,255,255,.65); margin-top: .75rem; }

/* CSS Scroll-Snap Carousel */
.carousel-wrapper {
  position: relative;
}
.carousel-track {
  display: flex;
  gap: 1.25rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: .5rem;
  cursor: grab;
}
.carousel-track:active { cursor: grabbing; }
.carousel-track::-webkit-scrollbar { display: none; }

.carousel-item {
  flex: 0 0 calc(50% - .625rem);
  scroll-snap-align: start;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-md);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .75rem;
  text-align: center;
  min-height: 130px;
  transition: background var(--t-fast), border-color var(--t-fast);
}
.carousel-item:hover { background: rgba(255,255,255,.1); border-color: var(--brand-blue); }
@media (min-width: 768px) { .carousel-item { flex: 0 0 calc(25% - .94rem); } }

/* Proveedores & Clientes Overrides */
.ci-prov { background: var(--white) !important; border-color: transparent !important; color: var(--navy) !important; box-shadow: var(--shadow-sm); min-height: 100px; }
.ci-prov span { font-size: 1.1rem; font-weight: 800; letter-spacing: 1px; color: var(--navy) !important; }
@media (min-width: 768px) { .ci-prov { flex: 0 0 calc(33.333% - 1rem) !important; } }
@media (min-width: 1024px) { .ci-prov { flex: 0 0 calc(16.666% - 1.25rem) !important; } }

.ci-client { background: rgba(255,255,255,.08) !important; border: 1px solid rgba(255,255,255,.15) !important; color: var(--white) !important; min-height: 100px; }
.ci-client:hover { background: rgba(255,255,255,.15) !important; border-color: var(--brand-blue) !important; }
.ci-client span { font-weight: 600; color: rgba(255,255,255,.9); font-size: 0.95rem; }
@media (min-width: 768px) { .ci-client { flex: 0 0 calc(50% - .625rem) !important; } }
@media (min-width: 1024px) { .ci-client { flex: 0 0 calc(25% - 1.125rem) !important; } }

.carousel-item .ci-icon {
  width: 44px; height: 44px;
  background: rgba(10,102,194,.15);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--brand-blue); font-size: 1.2rem;
}
.carousel-item span { font-weight: 600; font-size: .9rem; color: rgba(255,255,255,.9); }
.carousel-item small { font-size: .75rem; color: rgba(255,255,255,.5); }

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: .5rem;
  margin-top: 1.5rem;
}
.cdot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,.2);
  cursor: pointer;
  transition: background var(--t-fast), transform var(--t-fast);
  border: none;
}
.cdot.is-active { background: var(--brand-blue); transform: scale(1.4); }

/* ===================== CONTACTO ===================== */
.contacto { background: var(--grey-100); }
.contacto-grid {
  display: grid;
  gap: 3rem;
}
@media (min-width: 768px) { .contacto-grid { grid-template-columns: 1fr 1.1fr; align-items: start; } }

.contacto-info h2 { margin-bottom: 1rem; }
.contacto-info p { margin-bottom: 2rem; }

.contact-details { display: flex; flex-direction: column; gap: 1.25rem; }
.c-detail {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.c-detail-icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  background: var(--white);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--brand-blue);
}
.c-detail-text strong { display: block; font-weight: 600; color: var(--navy); font-size: .95rem; }
.c-detail-text span { font-size: .85rem; color: var(--grey-500); }

/* Contact Form */
.contact-form {
  background: var(--white);
  padding: 2rem 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}
@media (min-width: 768px) { .contact-form { padding: 2.5rem; } }

.contact-form h3 { margin-bottom: 1.5rem; color: var(--navy); }

.form-row { display: flex; flex-direction: column; gap: 1rem; margin-bottom: 1rem; }
@media (min-width: 500px) { .form-row { flex-direction: row; } }

.form-group { display: flex; flex-direction: column; gap: .4rem; flex: 1; }
.form-group label { font-size: .85rem; font-weight: 600; color: var(--steel); }
.form-group input, .form-group select, .form-group textarea {
  padding: .75rem 1rem;
  border: 1.5px solid var(--grey-200);
  border-radius: var(--radius-sm);
  background: var(--grey-100);
  color: var(--text);
  min-height: var(--tap);
  transition: border-color var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--brand-blue);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(10,102,194,.15);
}
.form-group textarea { min-height: 100px; resize: vertical; }

.form-submit {
  width: 100%;
  margin-top: 1.5rem;
  background: var(--brand-blue);
  color: var(--white);
  border: none;
  border-radius: 50px;
  min-height: var(--tap);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
  box-shadow: 0 4px 14px rgba(10,102,194,.4);
}
.form-submit:hover { background: var(--brand-blue-dk); transform: translateY(-2px); }
.form-submit:active { transform: none; }

/* ===================== FOOTER ===================== */
footer {
  background: var(--navy);
  color: rgba(255,255,255,.55);
  padding-block: 3rem;
  font-size: .85rem;
}
.footer-inner {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
@media (min-width: 768px) {
  .footer-inner { flex-direction: row; justify-content: space-between; align-items: flex-start; padding-inline: 2rem; }
}

.footer-brand .logo { color: var(--white); font-size: 1rem; margin-bottom: .5rem; }
.footer-brand p { font-size: .82rem; }
.footer-brand .ruc { margin-top: .5rem; color: rgba(255,255,255,.35); }

.footer-links { display: flex; gap: 2.5rem; flex-wrap: wrap; }
.footer-links a { color: rgba(255,255,255,.55); font-size: .85rem; transition: color var(--t-fast); }
.footer-links a:hover { color: var(--brand-blue); }

.footer-copy { text-align: center; padding-top: 2rem; border-top: 1px solid rgba(255,255,255,.07); font-size: .78rem; }

/* ===================== WHATSAPP FAB ===================== */
.wa-fab {
  position: fixed;
  bottom: 1.5rem;
  right: 1.25rem;
  z-index: 700;
  width: 58px;
  height: 58px;
  background: #25D366;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(37,211,102,.5);
  transition: transform var(--t-fast), box-shadow var(--t-fast);
  text-decoration: none;
  will-change: transform;
}
.wa-fab:hover { transform: scale(1.12); box-shadow: 0 6px 28px rgba(37,211,102,.55); }
.wa-fab:active { transform: scale(.97); }
.wa-fab svg { width: 32px; height: 32px; fill: white; }

/* ===================== MISC ===================== */
.visually-hidden { position: absolute; width: 1px; height: 1px; clip: rect(0,0,0,0); overflow: hidden; }