:root {
  /* Colors */
  --smart-blue: #2D5DA8;
  --smart-blue-hover: #234c8c;
  --white: #ffffff;
  --soft-gray: #f7f9fc;
  --text-dark: #1e293b;
  --text-light: #64748b;
  --border-color: #e2e8f0;

  /* Typography */
  --font-primary: 'Noto Sans Thai', 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  
  /* Layout */
  --container-width: 1320px;
  
  /* Spacing System */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-xxl: 96px;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 999px;
  
  /* Shadows */
  --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 10px 40px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --transition-fast: 200ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  color: var(--text-dark);
  background-color: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

/* Typography Classes */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.headline-1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
.headline-2 { font-size: clamp(1.75rem, 5vw, 3rem); }
.headline-3 { font-size: clamp(1.25rem, 4vw, 2.25rem); }
.subheadline { font-size: clamp(1.125rem, 2vw, 1.25rem); color: var(--text-light); }
.eyebrow { font-size: 0.875rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--smart-blue); }

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

.section {
  padding: 120px 0;
}
@media (max-width: 768px) {
  .section { padding: 80px 0; }
}
@media (max-width: 390px) {
  .section { padding: 64px 0; }
}

.bg-soft-gray { background-color: var(--soft-gray); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 52px;
  padding: 0 24px;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.btn-primary {
  background-color: var(--smart-blue);
  color: var(--white);
}
.btn-primary:hover {
  background-color: var(--smart-blue-hover);
  transform: scale(1.02);
}

.btn-secondary {
  background-color: var(--white);
  color: var(--smart-blue);
  border: 1px solid var(--smart-blue);
}
.btn-secondary:hover {
  background-color: var(--soft-gray);
}

.btn-ghost {
  background: transparent;
  color: var(--smart-blue);
  padding: 0 16px;
}
.btn-ghost:hover {
  opacity: 0.8;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 88px;
  z-index: 100;
  transition: box-shadow var(--transition-normal);
  display: flex;
  align-items: center;
  background-color: var(--white);
  box-shadow: 0 1px 0 rgba(0,0,0,0.05);
}

.navbar.scrolled {
  box-shadow: var(--shadow-soft);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.nav-logo img {
  height: 80px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
}

.nav-links a {
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--smart-blue);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 88px;
    left: 0;
    width: 100%;
    background-color: var(--white);
    padding: var(--space-md) 0;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    text-align: center;
  }
  .nav-links.active {
    display: flex;
  }

  .nav-actions {
    display: none;
  }
  .nav-actions.active {
    display: flex;
    position: absolute;
    top: 310px;
    left: 0;
    width: 100%;
    background-color: var(--white);
    padding-bottom: var(--space-md);
    justify-content: center;
    box-shadow: 0 10px 10px rgba(0,0,0,0.05);
  }

  .hamburger {
    display: block;
    cursor: pointer;
    z-index: 101;
  }
}
@media (min-width: 769px) {
  .hamburger { display: none; }
}

/* Animations */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

/* Product Collection & Tabs */
.tabs {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.tab-btn {
  background: transparent;
  border: none;
  font-size: 1.125rem;
  font-family: var(--font-primary);
  font-weight: 500;
  color: var(--text-light);
  padding: var(--space-xs) var(--space-md);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  position: relative;
}

.tab-badge {
  position: absolute;
  top: -6px;
  right: 0;
  background-color: #E53E3E; /* Modern Red */
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: 0 2px 4px rgba(229, 62, 62, 0.3);
}

.tab-btn.active {
  color: var(--smart-blue);
  border-bottom-color: var(--smart-blue);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
}

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

.product-img-wrapper {
  position: relative;
  width: 100%;
  padding-top: 100%; /* 1:1 Aspect Ratio */
  overflow: hidden;
  background-color: var(--soft-gray);
}

.product-img-wrapper img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

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

.badge {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--white);
}

.badge-original { background-color: #38bdf8; } /* Light Blue */
.badge-premium { background-color: var(--smart-blue); } /* Dark Blue */

.product-info {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.product-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.product-desc {
  color: var(--text-light);
  font-size: 0.875rem;
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

/* Marquee Animation for Testimonials */
.marquee-container {
  width: 100%;
  overflow: hidden;
  position: relative;
  display: flex;
  padding: var(--space-md) 0;
  background: var(--soft-gray);
}

.marquee-content {
  display: flex;
  gap: var(--space-md);
  animation: scroll 100s linear infinite;
  padding-left: var(--space-md);
  width: max-content;
}

.marquee-content:hover {
  animation-play-state: paused;
}

.review-img {
  height: 350px;
  width: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  object-fit: cover;
  background: white;
  padding: 8px;
  border: 1px solid var(--border-color);
}

@keyframes scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(calc(-50% - (var(--space-md) / 2))); }
}

/* Floating Line Button */
.floating-line-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  transition: all 0.3s ease;
  display: block;
}

.floating-line-btn:hover {
  transform: scale(1.1);
}

.line-icon-img {
  width: 60px;
  height: 60px;
  object-fit: contain;
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(0, 185, 0, 0.4);
}