/* ============================================================
   MH INTRENA TECHNOLOGY — MAIN STYLESHEET
   ------------------------------------------------------------
   Primary:   Teal / Blue-green
   Accent:    Orange
   Text:      Dark navy / charcoal
   ============================================================ */

/* ---------- 1. RESET & BASE ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px; /* offset for sticky header */
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--navy-700);
  background: var(--white);
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

/* ---------- 2. CSS VARIABLES ---------- */
:root {
  /* Teal / blue-green palette */
  --teal-900: #0B4F4A;
  --teal-700: #0E7A74;
  --teal-600: #12958D;
  --teal-500: #1AA79E;
  --teal-100: #E6F5F4;

  /* Orange accent */
  --orange-500: #F97316;
  --orange-400: #FB923C;
  --orange-100: #FFF1E6;

  /* Neutral */
  --navy-900: #0B1A2B;
  --navy-700: #1E293B;
  --gray-100: #F4F7F9;
  --gray-200: #E2E8F0;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --white: #FFFFFF;

  /* WhatsApp green */
  --whatsapp: #25D366;
  --whatsapp-dark: #1DA851;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(11, 26, 43, 0.06);
  --shadow-md: 0 4px 14px rgba(11, 26, 43, 0.08);
  --shadow-lg: 0 12px 32px rgba(11, 26, 43, 0.12);

  /* Radius */
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;

  --transition: 0.3s ease;
  --container: 1200px;
}

/* ---------- 3. TYPOGRAPHY ---------- */
h1, h2, h3, h4, h5 {
  font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
  color: var(--navy-900);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
h4 { font-size: 1.1rem; }

p { color: var(--gray-500); }

/* ---------- 4. LAYOUT HELPERS ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 90px 0;
}

.section-head {
  max-width: 720px;
  margin: 0 auto 60px;
  text-align: center;
}

.section-head h2 {
  margin-bottom: 16px;
}

.section-head p {
  font-size: 1.05rem;
}

/* Eyebrow label */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal-700);
  background: var(--teal-100);
  padding: 8px 16px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.eyebrow i { color: var(--orange-500); }

/* ---------- 5. BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn i { font-size: 0.9em; }

.btn-primary {
  background: var(--teal-700);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(14, 122, 116, 0.25);
}
.btn-primary:hover {
  background: var(--teal-900);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(14, 122, 116, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--teal-700);
  border-color: var(--teal-700);
}
.btn-outline:hover {
  background: var(--teal-700);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-accent {
  background: var(--orange-500);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(249, 115, 22, 0.25);
}
.btn-accent:hover {
  background: #EA6A0A;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(249, 115, 22, 0.3);
}

.btn-light {
  background: var(--white);
  color: var(--navy-900);
}
.btn-light:hover {
  background: var(--gray-100);
  transform: translateY(-2px);
}

.btn-whatsapp {
  background: var(--whatsapp);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(37, 211, 102, 0.25);
}
.btn-whatsapp:hover {
  background: var(--whatsapp-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(37, 211, 102, 0.3);
}

.btn-block {
  width: 100%;
}

/* ---------- 6. HEADER / NAVIGATION ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--white);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 96px;
}

.logo img {
  width: 200px;
  height: 90px;
  object-fit: contain;
}

.main-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--navy-700);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover {
  color: var(--teal-700);
  background: var(--teal-100);
}

.nav-link.active {
  color: var(--teal-700);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 3px;
  background: var(--orange-500);
  border-radius: 2px;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
}

.nav-toggle span {
  display: block;
  height: 2.5px;
  width: 100%;
  background: var(--navy-900);
  border-radius: 2px;
  transition: all var(--transition);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* ---------- 7. HERO ---------- */
.hero {
  position: relative;
  padding: 80px 0 100px;
  background: linear-gradient(160deg, var(--gray-100) 0%, var(--teal-100) 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -120px;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(26, 167, 158, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

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

.hero-content h1 {
  margin-bottom: 22px;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--gray-500);
  margin-bottom: 34px;
}

.hero-lead strong {
  color: var(--teal-700);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 44px;
}

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

.hero-stats li {
  display: flex;
  flex-direction: column;
}

.hero-stats strong {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--teal-700);
  line-height: 1.1;
}

.hero-stats span {
  font-size: 0.85rem;
  color: var(--gray-500);
  font-weight: 500;
}

.hero-media img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* ---------- 8. ABOUT ---------- */
.about {
  background: var(--white);
}

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

.about-media img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.about-content h3 {
  margin-bottom: 18px;
}

.about-content p {
  margin-bottom: 16px;
}

.about-subtitle {
  margin: 26px 0 16px;
  color: var(--teal-700);
}

.expertise-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 24px;
  margin-bottom: 32px;
}

.expertise-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--navy-700);
  font-weight: 500;
}

.expertise-list i {
  color: var(--teal-600);
  font-size: 0.95rem;
}

/* ---------- 9. SERVICES ---------- */
.services {
  background: var(--gray-100);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 60px;
}

.service-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}

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

.service-media {
  overflow: hidden;
  aspect-ratio: 3 / 2;
}

.service-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.service-card:hover .service-media img {
  transform: scale(1.05);
}

.service-body {
  padding: 30px 26px 32px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.service-icon {
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--teal-100);
  color: var(--teal-700);
  border-radius: 14px;
  font-size: 1.4rem;
  margin-bottom: 18px;
  transition: background var(--transition), color var(--transition);
}

.service-card:hover .service-icon {
  background: var(--orange-100);
  color: var(--orange-500);
}

.service-body h3 {
  margin-bottom: 12px;
}

.service-body p {
  font-size: 0.95rem;
  margin-bottom: 18px;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 22px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--navy-700);
}

.feature-list i {
  color: var(--orange-500);
  font-size: 0.8rem;
  margin-top: 5px;
  flex-shrink: 0;
}

.service-link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--teal-700);
  transition: gap var(--transition), color var(--transition);
}

.service-link:hover {
  gap: 12px;
  color: var(--orange-500);
}

/* Support band */
.support-band {
  display: flex;
  align-items: center;
  gap: 28px;
  background: linear-gradient(135deg, var(--orange-500), var(--orange-400));
  border-radius: var(--radius-lg);
  padding: 38px 40px;
  box-shadow: 0 12px 32px rgba(249, 115, 22, 0.28);
  flex-wrap: wrap;
}

.support-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  color: var(--white);
  font-size: 1.7rem;
  flex-shrink: 0;
}

.support-text {
  flex: 1;
  min-width: 260px;
}

.support-text h3 {
  color: var(--white);
  margin-bottom: 6px;
}

.support-text p {
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.98rem;
  margin: 0;
}

/* ---------- 10. PRODUCTS ---------- */
.products {
  background: var(--white);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.product-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--teal-100);
}

.product-media {
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: var(--gray-100);
}

.product-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.product-card:hover .product-media img {
  transform: scale(1.05);
}

.product-info {
  padding: 22px 24px 26px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.product-name {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--navy-900);
}

.product-price {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--teal-700);
  margin-bottom: 18px;
}

.product-info .btn {
  margin-top: auto;
}

/* ---------- 11. CONTACT ---------- */
.contact {
  background: var(--gray-100);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-bottom: 50px;
}

.contact-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.contact-card:hover {
  box-shadow: var(--shadow-md);
}

.contact-card-icon {
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--teal-100);
  color: var(--teal-700);
  border-radius: 14px;
  font-size: 1.4rem;
  margin-bottom: 20px;
}

.contact-card h3 {
  margin-bottom: 14px;
}

.contact-address {
  font-size: 1rem;
  color: var(--navy-700);
  line-height: 1.8;
  margin-bottom: 22px;
}

.contact-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  margin-bottom: 22px;
}

.contact-mini-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.contact-mini-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.92rem;
  color: var(--gray-500);
}

.contact-mini-list i {
  color: var(--teal-600);
  width: 18px;
  text-align: center;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 22px;
  margin: 26px 0 30px;
}

.contact-details li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.cd-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--teal-100);
  color: var(--teal-700);
  border-radius: 12px;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.cd-text {
  display: flex;
  flex-direction: column;
}

.cd-text small {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gray-400);
  font-weight: 600;
  margin-bottom: 2px;
}

.cd-text a,
.cd-text span {
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy-900);
}

.cd-text a:hover {
  color: var(--teal-700);
}

/* ---------- 12. ENQUIRY FORM ---------- */
.form-wrap {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 46px 48px;
  box-shadow: var(--shadow-md);
  max-width: 900px;
  margin: 0 auto;
}

.form-head {
  text-align: center;
  margin-bottom: 34px;
}

.form-head h3 {
  margin-bottom: 8px;
}

.form-head p {
  font-size: 0.98rem;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.form-field {
  display: flex;
  flex-direction: column;
}

.form-field.full {
  grid-column: 1 / -1;
}

.form-field label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--navy-900);
  margin-bottom: 8px;
}

.req {
  color: var(--orange-500);
}

.form-field input,
.form-field textarea {
  font-family: inherit;
  font-size: 0.98rem;
  padding: 14px 16px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  background: var(--white);
  color: var(--navy-900);
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--gray-400);
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--teal-600);
  box-shadow: 0 0 0 4px rgba(18, 149, 141, 0.12);
}

.form-field textarea {
  resize: vertical;
  min-height: 140px;
}

.form-field.invalid input,
.form-field.invalid textarea {
  border-color: #E11D48;
  box-shadow: 0 0 0 4px rgba(225, 29, 72, 0.1);
}

.field-error {
  display: none;
  font-size: 0.82rem;
  color: #E11D48;
  margin-top: 6px;
}

.form-field.invalid .field-error {
  display: block;
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.form-note {
  font-size: 0.85rem;
  color: var(--gray-400);
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}

.form-note i {
  color: var(--teal-600);
}

/* Success message */
.form-success {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--teal-100);
  border: 1px solid var(--teal-500);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-top: 28px;
}

.form-success i {
  color: var(--teal-700);
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.form-success p {
  color: var(--teal-900);
  font-weight: 500;
  margin: 0;
}

/* ---------- 13. FOOTER ---------- */
.site-footer {
  background: var(--navy-900);
  color: rgba(255, 255, 255, 0.75);
  padding-top: 70px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.1fr;
  gap: 44px;
  padding-bottom: 50px;
}

.footer-col h3 {
  color: var(--white);
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.footer-col h4 {
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 12px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 3px;
  background: var(--orange-500);
  border-radius: 2px;
}

.footer-brand p {
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.8;
  margin-bottom: 22px;
}

.social-links {
  display: flex;
  gap: 12px;
}

.social-links a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.08);
  color: var(--white);
  border-radius: 10px;
  font-size: 0.95rem;
  transition: background var(--transition), transform var(--transition);
}

.social-links a:hover {
  background: var(--teal-600);
  transform: translateY(-3px);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.65);
  transition: color var(--transition), padding-left var(--transition);
}

.footer-links a:hover {
  color: var(--orange-400);
  padding-left: 5px;
}

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

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.92rem;
}

.footer-contact i {
  color: var(--teal-500);
  margin-top: 4px;
  width: 18px;
  text-align: center;
  flex-shrink: 0;
}

.footer-contact a {
  color: rgba(255, 255, 255, 0.75);
}

.footer-contact a:hover {
  color: var(--orange-400);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 24px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.5);
  margin: 0;
}

/* ---------- 14. MODAL ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal.open {
  display: flex;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(11, 26, 43, 0.65);
  backdrop-filter: blur(4px);
  animation: fadeIn 0.25s ease;
}

.modal-dialog {
  position: relative;
  background: var(--white);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 760px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.3s ease;
  z-index: 1;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gray-100);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  color: var(--navy-700);
  font-size: 1.1rem;
  transition: background var(--transition), color var(--transition);
  z-index: 2;
}

.modal-close:hover {
  background: var(--orange-500);
  color: var(--white);
}

.modal-body {
  padding: 40px;
}

.modal-product {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 34px;
  align-items: start;
}

.modal-product img {
  width: 100%;
  border-radius: var(--radius);
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.modal-product h3 {
  margin-bottom: 10px;
}

.modal-price {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--teal-700);
  margin-bottom: 16px;
}

.modal-desc {
  font-size: 0.95rem;
  color: var(--gray-500);
  margin-bottom: 22px;
}

.modal-features {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 26px;
}

.modal-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--navy-700);
}

.modal-features i {
  color: var(--orange-500);
  font-size: 0.8rem;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 15. BACK TO TOP ---------- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--teal-700);
  color: var(--white);
  border: none;
  border-radius: 50%;
  font-size: 1rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition);
  z-index: 900;
}

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

.back-to-top:hover {
  background: var(--orange-500);
  transform: translateY(-4px);
}

/* ---------- 16. SKIP LINK ---------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--teal-700);
  color: var(--white);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 3000;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 16px;
}

/* ---------- 17. REVEAL ANIMATION ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================================
   18. RESPONSIVE — TABLET (max-width: 1024px)
   ============================================================ */
@media (max-width: 1024px) {

  .section { padding: 70px 0; }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-media {
    order: -1;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-media { order: -1; }

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

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

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

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

/* ============================================================
   19. RESPONSIVE — MOBILE (max-width: 768px)
   ============================================================ */
@media (max-width: 768px) {

  .container { padding: 0 20px; }

  .section { padding: 56px 0; }

  .section-head { margin-bottom: 40px; }

  /* ---- Header / Mobile Nav ---- */
  .header-inner {
    height: 80px;
  }

  .logo img {
    width: 150px;
    height: 68px;
  }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background: var(--white);
    box-shadow: var(--shadow-lg);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
    border-top: 1px solid var(--gray-200);
  }

  .main-nav.open {
    max-height: 420px;
  }

  .main-nav .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 20px 24px;
  }

  .nav-link {
    padding: 14px 16px;
    border-radius: var(--radius-sm);
  }

  .nav-link.active::after {
    display: none;
  }

  .nav-link.active {
    background: var(--teal-100);
  }

  /* ---- Hero ---- */
  .hero {
    padding: 50px 0 70px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-stats {
    gap: 24px;
  }

  .hero-stats strong { font-size: 1.5rem; }

  /* ---- About ---- */
  .expertise-list {
    grid-template-columns: 1fr;
  }

  /* ---- Services ---- */
  .services-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* ---- Support band ---- */
  .support-band {
    flex-direction: column;
    text-align: center;
    padding: 32px 24px;
  }

  .support-band .btn {
    width: 100%;
  }

  /* ---- Products ---- */
  .products-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* ---- Contact ---- */
  .contact-card {
    padding: 28px 22px;
  }

  /* ---- Form ---- */
  .form-wrap {
    padding: 32px 22px;
  }

  .form-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .form-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .form-actions .btn {
    width: 100%;
  }

  .form-note {
    justify-content: center;
  }

  /* ---- Footer ---- */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  /* ---- Modal ---- */
  .modal-body {
    padding: 30px 22px;
  }

  /* ---- Back to top ---- */
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
  }
}

/* ============================================================
   20. SMALL MOBILE (max-width: 480px)
   ============================================================ */
@media (max-width: 480px) {

  h1 { font-size: 1.85rem; }
  h2 { font-size: 1.5rem; }

  .eyebrow {
    font-size: 0.72rem;
    padding: 6px 12px;
  }

  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }

  .btn {
    padding: 13px 22px;
    font-size: 0.9rem;
  }
}

/* ---------- 21. REDUCED MOTION ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}