/* ============================================================
   C. A. Tech Sistemas — Stylesheet
   ============================================================ */

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

:root {
  --primary:    #0d3b6e;
  --secondary:  #1565c0;
  --cta:        #2196f3;
  --cta-hover:  #1976d2;
  --petrol:     #0a2d52;
  --light:      #f4f7fb;
  --gray-100:   #f8faff;
  --gray-200:   #e8edf5;
  --gray-400:   #94a3b8;
  --gray-600:   #64748b;
  --dark:       #0f1e36;
  --text:       #1e293b;
  --text-light: #475569;
  --white:      #ffffff;
  --radius:     10px;
  --radius-lg:  18px;
  --shadow-sm:  0 2px 8px rgba(13,59,110,.08);
  --shadow-md:  0 6px 24px rgba(13,59,110,.14);
  --shadow-lg:  0 16px 48px rgba(13,59,110,.18);
  --transition: .25s ease;
  --font:       'Inter', 'Segoe UI', system-ui, sans-serif;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a  { color: var(--cta); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--cta-hover); }

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--primary);
}
h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.45rem); }
h4 { font-size: 1.1rem; }
p  { color: var(--text-light); }

.section-tag {
  display: inline-block;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cta);
  background: rgba(33,150,243,.1);
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 14px;
}

.section-title {
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-light);
  max-width: 600px;
  margin-bottom: 48px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .95rem;
  font-weight: 600;
  padding: 13px 28px;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--cta);
  color: var(--white);
  border-color: var(--cta);
}
.btn-primary:hover {
  background: var(--cta-hover);
  border-color: var(--cta-hover);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(33,150,243,.35);
}

.btn-outline {
  background: transparent;
  color: var(--cta);
  border-color: var(--cta);
}
.btn-outline:hover {
  background: var(--cta);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-white {
  background: var(--white);
  color: var(--primary);
  border-color: var(--white);
}
.btn-white:hover {
  background: var(--light);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
}

.btn-outline-white {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,.6);
}
.btn-outline-white:hover {
  background: rgba(255,255,255,.12);
  color: var(--white);
}

/* ---------- Header & Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 var(--gray-200);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--secondary), var(--cta));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 900;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-name {
  font-size: .95rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -.01em;
}

.logo-tagline {
  font-size: .65rem;
  font-weight: 500;
  color: var(--gray-600);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 8px 14px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--text);
  border-radius: 8px;
  transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--cta);
  background: rgba(33,150,243,.08);
}

.nav-cta {
  margin-left: 10px;
}

/* Mobile menu */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border: none;
  background: none;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: linear-gradient(135deg, var(--petrol) 0%, var(--primary) 45%, var(--secondary) 100%);
  color: var(--white);
  padding: 100px 0 90px;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 70% at 70% 50%, rgba(33,150,243,.18) 0%, transparent 70%),
    radial-gradient(ellipse 40% 50% at 20% 80%, rgba(255,255,255,.04) 0%, transparent 60%);
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  color: rgba(255,255,255,.9);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 7px 16px;
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: #4caf50;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .6; transform: scale(1.3); }
}

.hero h1 { color: var(--white); margin-bottom: 20px; }

.hero h1 span {
  background: linear-gradient(90deg, #64b5f6, #90caf9);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,.8);
  margin-bottom: 36px;
  max-width: 500px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1;
}

.stat-label {
  font-size: .78rem;
  color: rgba(255,255,255,.6);
  margin-top: 4px;
}

/* Hero visual */
.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.product-card-hero {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
}

.product-card-hero:hover {
  background: rgba(255,255,255,.14);
  border-color: rgba(255,255,255,.28);
  transform: translateX(6px);
}

.pch-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.pch-info { flex: 1; }
.pch-name {
  font-size: .95rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 3px;
}
.pch-desc {
  font-size: .78rem;
  color: rgba(255,255,255,.65);
}
.pch-arrow { color: rgba(255,255,255,.5); font-size: 1.1rem; }

/* ---------- Sections ---------- */
section { padding: 80px 0; }

.section-centered { text-align: center; }
.section-centered .section-subtitle { margin-left: auto; margin-right: auto; }

/* ---------- Services ---------- */
.services-bg { background: var(--light); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.service-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--secondary), var(--cta));
  opacity: 0;
  transition: opacity var(--transition);
}

.service-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-lg);
  transform: translateY(-6px);
}

.service-card:hover::before { opacity: 1; }

.service-icon {
  width: 56px;
  height: 56px;
  background: rgba(33,150,243,.1);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.service-card h3 { margin-bottom: 10px; }

.service-card ul {
  list-style: none;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.service-card ul li {
  font-size: .87rem;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

.service-card ul li::before {
  content: '✓';
  color: var(--cta);
  font-weight: 700;
  flex-shrink: 0;
}

/* ---------- Products ---------- */
.products-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 48px;
}

.product-card {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}

.product-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-6px);
  border-color: transparent;
}

.product-header {
  padding: 32px;
  position: relative;
  overflow: hidden;
}

.product-header.zap   { background: linear-gradient(135deg, #0d47a1, #1976d2); }
.product-header.update { background: linear-gradient(135deg, #01579b, #0288d1); }

.product-badge {
  display: inline-block;
  background: rgba(255,255,255,.2);
  color: var(--white);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 14px;
}

.product-header h3 { color: var(--white); font-size: 1.5rem; margin-bottom: 8px; }
.product-header p { color: rgba(255,255,255,.78); font-size: .9rem; }

.product-logo {
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 4rem;
  opacity: .15;
}

.product-body { padding: 28px 32px; }

.product-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.feat-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: .85rem;
  color: var(--text-light);
}

.feat-item-icon {
  width: 28px;
  height: 28px;
  background: rgba(33,150,243,.1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .8rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.product-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---------- About (home teaser) ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.about-stat-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.about-stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.about-stat-card .num {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 6px;
}

.about-stat-card .lbl {
  font-size: .78rem;
  color: var(--gray-600);
  font-weight: 500;
}

.about-stat-card.featured {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-color: transparent;
  grid-column: 1 / -1;
}

.about-stat-card.featured .num,
.about-stat-card.featured .lbl { color: var(--white); }
.about-stat-card.featured .lbl { opacity: .8; }

.about-content .section-tag { margin-bottom: 12px; }
.about-content h2 { margin-bottom: 18px; }
.about-content p { margin-bottom: 16px; }

.pillars {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 24px 0 32px;
}

.pillar {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.pillar-icon {
  width: 40px;
  height: 40px;
  background: rgba(33,150,243,.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.pillar-text strong { display: block; font-weight: 700; color: var(--text); font-size: .9rem; }
.pillar-text span { font-size: .83rem; color: var(--text-light); }

/* ---------- CTA Banner ---------- */
.cta-section {
  background: linear-gradient(135deg, var(--petrol), var(--primary));
  color: var(--white);
  text-align: center;
  padding: 80px 0;
}

.cta-section h2 { color: var(--white); margin-bottom: 16px; }
.cta-section p { color: rgba(255,255,255,.75); font-size: 1.05rem; margin-bottom: 36px; max-width: 520px; margin-left: auto; margin-right: auto; }

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- Testimonials ---------- */
.testimonials-bg { background: var(--light); }

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.testimonial-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.stars { color: #f59e0b; font-size: 1rem; margin-bottom: 14px; }

.testimonial-card p {
  font-size: .9rem;
  line-height: 1.7;
  margin-bottom: 20px;
  color: var(--text-light);
  font-style: italic;
}

.testimonial-card p::before { content: '"'; }
.testimonial-card p::after { content: '"'; }

.testi-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--secondary), var(--cta));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: .95rem;
  flex-shrink: 0;
}

.author-name { font-weight: 700; font-size: .9rem; color: var(--text); }
.author-role { font-size: .78rem; color: var(--gray-600); }

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 56px;
  align-items: start;
}

.contact-info h2 { margin-bottom: 14px; }
.contact-info p { margin-bottom: 32px; }

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.channel {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  text-decoration: none;
  transition: all var(--transition);
}

.channel:hover {
  border-color: var(--cta);
  box-shadow: 0 0 0 3px rgba(33,150,243,.1);
  transform: translateX(4px);
}

.channel-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.channel-icon.whatsapp { background: rgba(37,211,102,.12); }
.channel-icon.email    { background: rgba(33,150,243,.1); }
.channel-icon.linkedin { background: rgba(10,102,194,.1); }
.channel-icon.instagram { background: rgba(225,48,108,.1); }

.channel-info .label { font-size: .72rem; font-weight: 600; color: var(--gray-400); text-transform: uppercase; letter-spacing: .08em; }
.channel-info .value { font-size: .9rem; font-weight: 600; color: var(--text); }

/* Contact Form */
.contact-form-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}

.contact-form-card h3 { margin-bottom: 6px; font-size: 1.3rem; }
.contact-form-card > p { margin-bottom: 28px; font-size: .9rem; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.form-group label {
  font-size: .83rem;
  font-weight: 600;
  color: var(--text);
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 11px 14px;
  font-size: .9rem;
  font-family: var(--font);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius);
  background: var(--gray-100);
  color: var(--text);
  transition: all var(--transition);
  outline: none;
  width: 100%;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--cta);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(33,150,243,.12);
}

.form-group textarea { resize: vertical; min-height: 110px; }

.form-success {
  display: none;
  padding: 16px;
  background: rgba(76,175,80,.1);
  border: 1px solid rgba(76,175,80,.3);
  border-radius: var(--radius);
  color: #2e7d32;
  font-weight: 600;
  font-size: .9rem;
  text-align: center;
  margin-top: 16px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--dark);
  color: rgba(255,255,255,.7);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer-brand .logo-name { color: var(--white); }
.footer-brand .logo-tagline { color: rgba(255,255,255,.4); }

.footer-desc {
  font-size: .85rem;
  color: rgba(255,255,255,.55);
  margin: 16px 0 24px;
  line-height: 1.7;
}

.social-links {
  display: flex;
  gap: 10px;
}

.social-link {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,.08);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.6);
  font-size: .85rem;
  transition: all var(--transition);
  text-decoration: none;
}

.social-link:hover {
  background: var(--cta);
  color: var(--white);
  transform: translateY(-2px);
}

.footer-col h4 {
  color: var(--white);
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: .85rem;
  color: rgba(255,255,255,.55);
  text-decoration: none;
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p { font-size: .8rem; color: rgba(255,255,255,.35); }

/* ---------- Page Hero (inner pages) ---------- */
.page-hero {
  background: linear-gradient(135deg, var(--petrol), var(--primary));
  padding: 64px 0 56px;
  color: var(--white);
}

.page-hero .breadcrumb {
  font-size: .8rem;
  color: rgba(255,255,255,.55);
  margin-bottom: 12px;
}

.page-hero .breadcrumb a { color: rgba(255,255,255,.6); text-decoration: none; }
.page-hero .breadcrumb a:hover { color: var(--white); }
.page-hero .breadcrumb span { margin: 0 8px; }

.page-hero h1 { color: var(--white); font-size: clamp(1.8rem, 4vw, 2.8rem); margin-bottom: 12px; }
.page-hero p  { color: rgba(255,255,255,.75); font-size: 1.05rem; max-width: 580px; }

/* ---------- About Page ---------- */
.timeline {
  position: relative;
  padding-left: 32px;
  margin-top: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--cta), transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: 36px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -38px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cta);
  border: 2px solid var(--white);
  box-shadow: 0 0 0 2px var(--cta);
}

.timeline-year {
  font-size: .75rem;
  font-weight: 700;
  color: var(--cta);
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.timeline-item h4 { margin-bottom: 6px; }
.timeline-item p { font-size: .88rem; }

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.value-card {
  text-align: center;
  padding: 32px 24px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

.value-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: rgba(33,150,243,.2);
}

.value-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.value-card h4 { color: var(--primary); margin-bottom: 8px; }
.value-card p { font-size: .85rem; }

/* ---------- Scroll top ---------- */
.scroll-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition);
  z-index: 999;
}

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

.scroll-top:hover {
  background: var(--cta);
  transform: translateY(-3px);
}

/* ---------- Floating WhatsApp ---------- */
.whatsapp-float {
  position: fixed;
  bottom: 82px;
  right: 28px;
  width: 52px;
  height: 52px;
  background: #25d366;
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 4px 20px rgba(37,211,102,.4);
  text-decoration: none;
  z-index: 999;
  transition: all var(--transition);
  animation: float-in .6s ease .5s both;
}

.whatsapp-float:hover {
  transform: scale(1.1) translateY(-2px);
  box-shadow: 0 8px 28px rgba(37,211,102,.5);
  color: var(--white);
}

@keyframes float-in {
  from { opacity: 0; transform: scale(.5); }
  to   { opacity: 1; transform: scale(1); }
}

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0 !important; }
.mt-4 { margin-top: 16px; }
.mt-8 { margin-top: 32px; }
.mt-12 { margin-top: 48px; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  section { padding: 60px 0; }

  .nav-hamburger { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 16px; }
  .nav-cta { width: 100%; text-align: center; }
  .nav-cta .btn { width: 100%; justify-content: center; }

  .hero { padding: 60px 0; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { display: none; }

  .services-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr 1fr; }

  .form-row { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; }

  .about-visual { display: none; }

  .product-features { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  .values-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .cta-buttons { flex-direction: column; align-items: center; }
}