/* ============================================
   MAI CHI FOOD - Premium Design System
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Playfair+Display:wght@400;500;600;700&display=swap');

/* CSS Custom Properties */
:root {
  /* Primary Colors - Forest Green & Gold */
  --primary-900: #0d3b1e;
  --primary-800: #145a2d;
  --primary-700: #1a7a3c;
  --primary-600: #21994b;
  --primary-500: #27b85a;
  --primary-400: #4cc97a;
  --primary-300: #7ddb9e;
  --primary-200: #b0ecc2;
  --primary-100: #e0f8e8;
  --primary-50: #f0fcf4;

  /* Gold Accent */
  --gold-600: #b8860b;
  --gold-500: #d4a017;
  --gold-400: #f0c040;
  --gold-300: #f5d576;
  --gold-200: #faeab0;
  --gold-100: #fdf5dc;

  /* Neutrals */
  --neutral-950: #0a0a0a;
  --neutral-900: #171717;
  --neutral-800: #262626;
  --neutral-700: #404040;
  --neutral-600: #525252;
  --neutral-500: #737373;
  --neutral-400: #a3a3a3;
  --neutral-300: #d4d4d4;
  --neutral-200: #e5e5e5;
  --neutral-100: #f5f5f5;
  --neutral-50: #fafafa;
  --white: #ffffff;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;

  /* Spacing */
  --section-padding: 100px 0;
  --container-padding: 0 24px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--neutral-800);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--container-padding);
}

/* ============================================
   HEADER / NAVIGATION
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: var(--transition-base);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-md);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

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

.logo img {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

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

.logo-text .company-name {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-800);
  line-height: 1.2;
}

.logo-text .company-tagline {
  font-size: 0.7rem;
  color: var(--gold-600);
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

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

.nav-menu a {
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--neutral-600);
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
  position: relative;
}

.nav-menu a:hover {
  color: var(--primary-700);
  background: var(--primary-50);
}

.nav-menu a.active {
  color: var(--primary-700);
  background: var(--primary-100);
}

.nav-cta {
  margin-left: 16px;
  padding: 10px 24px !important;
  background: linear-gradient(135deg, var(--primary-700), var(--primary-600)) !important;
  color: var(--white) !important;
  font-weight: 600 !important;
  border-radius: var(--radius-full) !important;
  box-shadow: 0 4px 14px rgba(26, 122, 60, 0.35);
}

.nav-cta:hover {
  background: linear-gradient(135deg, var(--primary-800), var(--primary-700)) !important;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(26, 122, 60, 0.4) !important;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--neutral-700);
  border-radius: 2px;
  transition: var(--transition-base);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--neutral-950);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
  transform: scale(1.05);
  animation: heroZoom 20s ease-in-out infinite alternate;
}

@keyframes heroZoom {
  0% { transform: scale(1.05); }
  100% { transform: scale(1.15); }
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(
    135deg,
    rgba(13, 59, 30, 0.85) 0%,
    rgba(10, 10, 10, 0.7) 50%,
    rgba(13, 59, 30, 0.6) 100%
  );
}

.hero .container {
  position: relative;
  z-index: 3;
  padding-top: 80px;
}

.hero-content {
  max-width: 700px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
  color: var(--gold-300);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 28px;
  animation: fadeInUp 0.8s ease-out;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--gold-400);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 3.8rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.15;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease-out 0.15s both;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--gold-400), var(--gold-300));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.8;
  margin-bottom: 40px;
  max-width: 560px;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.45s both;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  background: linear-gradient(135deg, var(--gold-500), var(--gold-400));
  color: var(--neutral-900);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: var(--transition-base);
  box-shadow: 0 4px 20px rgba(212, 160, 23, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(212, 160, 23, 0.45);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--white);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-base);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-2px);
}

/* Hero Stats */
.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 72px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

.hero-stat .stat-number {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--gold-400);
  line-height: 1;
}

.hero-stat .stat-label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.55);
  margin-top: 8px;
  font-weight: 500;
}

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

/* ============================================
   SECTION UTILITIES
   ============================================ */
.section {
  padding: var(--section-padding);
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--primary-50);
  color: var(--primary-700);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
  border: 1px solid var(--primary-200);
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--neutral-900);
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--neutral-500);
  line-height: 1.7;
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about {
  background: var(--neutral-50);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-image {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-2xl);
}

.about-image img {
  width: 100%;
  height: 450px;
  object-fit: cover;
  transition: var(--transition-slow);
}

.about-image:hover img {
  transform: scale(1.03);
}

.about-image-badge {
  position: absolute;
  bottom: 24px;
  left: 24px;
  padding: 14px 24px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.about-image-badge .badge-number {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-700);
  line-height: 1;
}

.about-image-badge .badge-text {
  font-size: 0.75rem;
  color: var(--neutral-500);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.about-content .section-title {
  text-align: left;
  margin-bottom: 20px;
}

.about-text {
  font-size: 1rem;
  color: var(--neutral-600);
  line-height: 1.8;
  margin-bottom: 32px;
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.about-feature {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  background: var(--white);
  border-radius: var(--radius-md);
  border: 1px solid var(--neutral-200);
  transition: var(--transition-base);
}

.about-feature:hover {
  border-color: var(--primary-300);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.about-feature .feature-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-100), var(--primary-50));
  border-radius: var(--radius-md);
  flex-shrink: 0;
  font-size: 1.3rem;
}

.about-feature .feature-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--neutral-800);
  margin-bottom: 4px;
}

.about-feature .feature-desc {
  font-size: 0.8rem;
  color: var(--neutral-500);
  line-height: 1.5;
}

/* ============================================
   PRODUCTS SECTION
   ============================================ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.product-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--neutral-200);
  transition: var(--transition-base);
  position: relative;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.product-card-image {
  height: 220px;
  overflow: hidden;
  position: relative;
}

.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-slow);
}

.product-card:hover .product-card-image img {
  transform: scale(1.08);
}

.product-card-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 5px 12px;
  background: var(--primary-700);
  color: var(--white);
  font-size: 0.7rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.product-card-body {
  padding: 24px;
}

.product-card-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--neutral-900);
  margin-bottom: 8px;
}

.product-card-desc {
  font-size: 0.85rem;
  color: var(--neutral-500);
  line-height: 1.6;
  margin-bottom: 16px;
}

.product-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary-700);
  transition: var(--transition-fast);
}

.product-card-link:hover {
  color: var(--primary-500);
  gap: 10px;
}

/* ============================================
   WHY CHOOSE US
   ============================================ */
.why-us {
  background: linear-gradient(135deg, var(--primary-900) 0%, var(--neutral-950) 100%);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.why-us::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(212, 160, 23, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.why-us .section-label {
  background: rgba(255, 255, 255, 0.08);
  color: var(--gold-400);
  border-color: rgba(255, 255, 255, 0.1);
}

.why-us .section-title {
  color: var(--white);
}

.why-us .section-subtitle {
  color: rgba(255, 255, 255, 0.55);
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.why-card {
  padding: 40px 32px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(10px);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.why-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold-500), var(--primary-400));
  opacity: 0;
  transition: var(--transition-base);
}

.why-card:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-4px);
}

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

.why-card-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(212, 160, 23, 0.15), rgba(212, 160, 23, 0.05));
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  font-size: 1.6rem;
}

.why-card-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--white);
}

.why-card-desc {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.7;
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
  background: var(--neutral-50);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: start;
}

.contact-info-cards {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-card {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 28px;
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--neutral-200);
  transition: var(--transition-base);
}

.contact-card:hover {
  border-color: var(--primary-300);
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.contact-card-icon {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-700), var(--primary-600));
  border-radius: var(--radius-md);
  flex-shrink: 0;
  font-size: 1.3rem;
}

.contact-card-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--neutral-400);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.contact-card-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--neutral-800);
  line-height: 1.5;
}

/* Contact Form */
.contact-form {
  padding: 40px;
  background: var(--white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--neutral-200);
  box-shadow: var(--shadow-lg);
}

.contact-form h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--neutral-900);
  margin-bottom: 8px;
}

.contact-form p {
  font-size: 0.9rem;
  color: var(--neutral-500);
  margin-bottom: 28px;
}

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

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--neutral-700);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 14px 18px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--neutral-800);
  background: var(--neutral-50);
  border: 1.5px solid var(--neutral-200);
  border-radius: var(--radius-md);
  outline: none;
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--primary-500);
  background: var(--white);
  box-shadow: 0 0 0 4px rgba(39, 184, 90, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.btn-submit {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--primary-700), var(--primary-600));
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-base);
  box-shadow: 0 4px 14px rgba(26, 122, 60, 0.35);
}

.btn-submit:hover {
  background: linear-gradient(135deg, var(--primary-800), var(--primary-700));
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 122, 60, 0.4);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--neutral-950);
  color: rgba(255, 255, 255, 0.6);
  padding: 80px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .logo {
  margin-bottom: 20px;
}

.footer-brand .logo-text .company-name {
  color: var(--white);
}

.footer-brand .footer-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

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

.social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  font-size: 1.1rem;
  transition: var(--transition-base);
}

.social-link:hover {
  background: var(--primary-700);
  border-color: var(--primary-700);
  color: var(--white);
  transform: translateY(-2px);
}

.footer-heading {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 24px;
}

.footer-links li {
  margin-bottom: 14px;
}

.footer-links a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.5);
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--gold-400);
  padding-left: 4px;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.footer-contact-item .icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  font-size: 0.82rem;
}

.footer-bottom a {
  color: var(--gold-400);
}

.footer-bottom a:hover {
  color: var(--gold-300);
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* ============================================
   BACK TO TOP
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-700), var(--primary-600));
  color: var(--white);
  border: none;
  border-radius: var(--radius-full);
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition-base);
  box-shadow: var(--shadow-lg);
  z-index: 99;
}

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

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 3rem;
  }

  .about-grid {
    gap: 48px;
  }

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

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

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

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px 24px;
    border-bottom: 1px solid var(--neutral-200);
    transform: translateY(-120%);
    opacity: 0;
    transition: var(--transition-base);
    gap: 4px;
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-menu a {
    display: block;
    padding: 12px 16px;
    width: 100%;
  }

  .nav-cta {
    margin-left: 0 !important;
    text-align: center;
    justify-content: center;
  }

  .hero {
    min-height: auto;
    padding: 120px 0 80px;
  }

  .hero h1 {
    font-size: 2.4rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .hero-stats {
    gap: 32px;
    flex-wrap: wrap;
  }

  .hero-stat .stat-number {
    font-size: 2rem;
  }

  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 2rem;
  }

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

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

  .products-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

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

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

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.9rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    justify-content: center;
  }

  .contact-form {
    padding: 24px;
  }
}