/* ==========================================================================
   Feng Tai Technology Research Co., Ltd. (Fort RDTech) - Core Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@300;400;500;700;900&family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Color Palette */
  --sky-blue: #0ea5e9;
  --sky-blue-hover: #0284c7;
  --sky-blue-light: #e0f2fe;
  --sky-blue-soft: #f0f9ff;
  
  --plant-green: #10b981;
  --plant-green-hover: #059669;
  --plant-green-light: #d1fae5;
  
  --earth-beige: #f5f0e6;
  --earth-sand: #e4dcd0;
  --earth-dark: #8c7853;
  --earth-light: #faf8f5;
  
  /* Neutral Colors */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  /* UI Elements */
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(255, 255, 255, 0.6);
  --border-light: #e2e8f0;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.08);
  
  /* Layout */
  --max-width: 1200px;
  --header-height: 80px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius: 16px;
}

/* Base resets & styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
}

body {
  font-family: 'Outfit', 'Noto Sans TC', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--sky-blue-light);
  border-radius: 5px;
  border: 2px solid var(--bg-primary);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--sky-blue);
}

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

ul {
  list-style: none;
}

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

/* Layout Utilities */
section {
  padding: 100px 24px;
  position: relative;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

/* Section Header */
.section-title-wrapper {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background-color: var(--sky-blue-light);
  color: var(--sky-blue-hover);
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: 30px;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  border: 1px solid rgba(14, 165, 233, 0.2);
}

.section-tag.green {
  background-color: var(--plant-green-light);
  color: var(--plant-green-hover);
  border-color: rgba(16, 185, 129, 0.2);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--sky-blue), var(--plant-green));
  border-radius: 2px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 20px auto 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 30px;
  cursor: pointer;
  transition: var(--transition-normal);
  border: none;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--sky-blue), var(--sky-blue-hover));
  color: white;
  box-shadow: 0 4px 15px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(14, 165, 233, 0.4);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-main);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--sky-blue-soft);
  border-color: var(--sky-blue);
  transform: translateY(-2px);
}

.btn-green {
  background: linear-gradient(135deg, var(--plant-green), var(--plant-green-hover));
  color: white;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-green:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(16, 185, 129, 0.4);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  background-color: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

header.scrolled {
  height: 70px;
  background-color: rgba(255, 255, 255, 0.9);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--text-main);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--sky-blue), var(--plant-green));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 900;
  font-size: 1.2rem;
  box-shadow: 0 4px 10px rgba(16, 185, 129, 0.2);
}

.logo-img {
  width: 38px;
  height: 38px;
  object-fit: cover;
  border-radius: 8px;
  background-color: white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.logo-text span {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  display: block;
  margin-top: -4px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-weight: 500;
  font-size: 1rem;
  color: var(--text-main);
  position: relative;
  padding: 8px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--sky-blue), var(--plant-green));
  transition: var(--transition-normal);
}

.nav-link:hover {
  color: var(--sky-blue-hover);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Mobile Toggle */
.hamburger {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-main);
  margin: 5px 0;
  transition: var(--transition-normal);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  background: radial-gradient(circle at 10% 20%, var(--sky-blue-soft) 0%, var(--bg-primary) 90%),
              radial-gradient(circle at 90% 80%, var(--plant-green-light) 0%, transparent 50%);
  padding-top: var(--header-height);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s forwards 0.2s;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: 30px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero-badge i {
  color: var(--plant-green);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #0f172a 30%, #3b82f6 70%, #10b981 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 40px;
  max-width: 600px;
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-image-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transform: scale(0.9);
  animation: scaleIn 1s forwards 0.4s;
}

.hero-bg-blob {
  position: absolute;
  width: 450px;
  height: 450px;
  background: linear-gradient(135deg, var(--sky-blue-light) 0%, var(--plant-green-light) 100%);
  filter: blur(80px);
  border-radius: 50%;
  z-index: 1;
  opacity: 0.7;
}

.hero-card {
  position: relative;
  z-index: 2;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  width: 100%;
  max-width: 400px;
  transform: rotate(2deg);
  transition: var(--transition-normal);
}

.hero-card:hover {
  transform: rotate(0deg) translateY(-8px);
}

.hero-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.hero-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-color: var(--sky-blue-light);
  color: var(--sky-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.hero-card-title {
  font-weight: 700;
  font-size: 1.1rem;
}

.hero-card-stat {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--plant-green);
  margin: 10px 0;
}

.hero-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.hero-shapes div {
  position: absolute;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--sky-blue) 0%, var(--plant-green) 100%);
  opacity: 0.1;
  pointer-events: none;
}

.shape-1 { width: 120px; height: 120px; top: 15%; right: 10%; animation: float 6s ease-in-out infinite; }
.shape-2 { width: 80px; height: 80px; bottom: 15%; left: 5%; animation: float 8s ease-in-out infinite 1s; }
.shape-3 { width: 60px; height: 60px; top: 50%; left: 40%; animation: float 5s ease-in-out infinite 0.5s; }

/* ==========================================================================
   About Us Section
   ========================================================================== */
.about {
  background-color: var(--bg-secondary);
}

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

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.about-image {
  background: linear-gradient(135deg, var(--earth-beige) 0%, var(--sky-blue-soft) 100%);
  border-radius: 24px;
  padding: 40px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.about-image::before {
  content: '';
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background-color: var(--plant-green-light);
  filter: blur(40px);
  top: -50px;
  right: -50px;
  opacity: 0.5;
}

.about-illus {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.illus-card {
  background-color: var(--bg-secondary);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 16px;
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.illus-num {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--earth-beige);
  color: var(--earth-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
}

.about-content {
  padding-left: 20px;
}

.about-content h3 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--text-main);
}

.about-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 30px;
}

.about-feature-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.about-feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--plant-green-light);
  color: var(--plant-green);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.2rem;
}

.about-feature-title {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 6px;
}

.about-feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Services Section
   ========================================================================== */
.services {
  background-color: var(--bg-primary);
}

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

.service-card {
  background-color: var(--bg-secondary);
  border-radius: 20px;
  padding: 40px 32px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.service-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--sky-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition-normal);
}

.service-card.green::after {
  background: var(--plant-green);
}

.service-card.earth::after {
  background: var(--earth-dark);
}

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

.service-card:hover::after {
  transform: scaleX(1);
}

.service-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 28px;
}

.service-card.blue .service-icon {
  background-color: var(--sky-blue-light);
  color: var(--sky-blue);
}

.service-card.green .service-icon {
  background-color: var(--plant-green-light);
  color: var(--plant-green);
}

.service-card.earth .service-icon {
  background-color: var(--earth-beige);
  color: var(--earth-dark);
}

.service-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.service-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
  flex-grow: 1;
}

.service-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 30px;
}

.service-list-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-main);
  font-weight: 500;
}

.service-list-item i {
  color: var(--plant-green);
  font-size: 0.85rem;
}

.service-card.blue .service-list-item i {
  color: var(--sky-blue);
}

.service-card.earth .service-list-item i {
  color: var(--earth-dark);
}

/* ==========================================================================
   UV Selector Section (Interactive Feature)
   ========================================================================== */
.selector {
  background-color: var(--earth-light);
  border-top: 1px solid var(--earth-sand);
  border-bottom: 1px solid var(--earth-sand);
}

.selector-panel {
  background-color: var(--bg-secondary);
  border-radius: 24px;
  border: 1px solid var(--earth-sand);
  box-shadow: var(--shadow-md);
  padding: 48px;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  position: relative;
  overflow: hidden;
}

.selector-panel::before {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background-color: var(--sky-blue-soft);
  filter: blur(60px);
  z-index: 1;
  opacity: 0.5;
}

.selector-steps-container {
  position: relative;
  z-index: 2;
}

.selector-nav {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 32px;
}

.selector-nav-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border-radius: 12px;
  cursor: pointer;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-muted);
  transition: var(--transition-normal);
}

.selector-nav-item.active {
  background-color: var(--sky-blue-light);
  border-color: var(--sky-blue);
  color: var(--sky-blue-hover);
  box-shadow: var(--shadow-sm);
}

.selector-nav-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 800;
  transition: var(--transition-normal);
}

.selector-nav-item.active .selector-nav-num {
  background-color: var(--sky-blue);
  color: white;
}

.selector-content-area {
  position: relative;
  z-index: 2;
}

.selector-step-content {
  display: none;
  animation: fadeIn 0.4s forwards;
}

.selector-step-content.active {
  display: block;
}

.selector-step-content h4 {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 24px;
  color: var(--text-main);
}

.option-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.option-card {
  padding: 16px 20px;
  border-radius: 12px;
  border: 1px solid var(--border-light);
  background-color: var(--bg-secondary);
  cursor: pointer;
  font-weight: 500;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 12px;
}

.option-card:hover {
  border-color: var(--sky-blue);
  background-color: var(--sky-blue-soft);
}

.option-card.selected {
  border-color: var(--plant-green);
  background-color: var(--plant-green-light);
  color: var(--plant-green-hover);
  font-weight: 700;
}

.option-circle {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--text-light);
  position: relative;
  transition: var(--transition-normal);
}

.option-card.selected .option-circle {
  border-color: var(--plant-green);
  background-color: var(--plant-green);
}

.option-card.selected .option-circle::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: white;
}

/* Result panel styles */
.result-panel {
  background-color: var(--bg-primary);
  border-radius: 20px;
  border: 1px solid var(--border-light);
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  z-index: 2;
  transition: var(--transition-normal);
  min-height: 380px;
}

.result-placeholder {
  text-align: center;
  color: var(--text-muted);
}

.result-placeholder-icon {
  font-size: 3rem;
  color: var(--sky-blue-light);
  margin-bottom: 16px;
  animation: float 4s ease-in-out infinite;
}

.result-data {
  display: none;
  animation: fadeIn 0.5s forwards;
}

.result-header {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 20px;
  margin-bottom: 24px;
}

.result-badge {
  display: inline-block;
  padding: 6px 12px;
  background-color: var(--plant-green-light);
  color: var(--plant-green-hover);
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: 20px;
  margin-bottom: 12px;
}

.result-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.result-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
}

.result-steps-title {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}

.result-steps-title i {
  color: var(--sky-blue);
}

.result-steps-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.result-step-item {
  display: flex;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.5;
}

.result-step-idx {
  width: 20px;
  height: 20px;
  background-color: var(--sky-blue-light);
  color: var(--sky-blue-hover);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
  flex-shrink: 0;
  margin-top: 4px;
}

.result-warning {
  background-color: rgba(245, 240, 230, 0.6);
  border: 1px solid var(--earth-sand);
  border-radius: 12px;
  padding: 16px;
  font-size: 0.9rem;
  color: var(--earth-dark);
  display: flex;
  gap: 12px;
}

.result-warning i {
  font-size: 1.1rem;
  margin-top: 2px;
  color: var(--earth-dark);
}

/* ==========================================================================
   Popular Science (科普文章) Section
   ========================================================================== */
.science {
  background-color: var(--bg-secondary);
}

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

.science-card {
  background-color: var(--bg-secondary);
  border-radius: 20px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.science-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
  border-color: var(--sky-blue-light);
}

.science-img-wrapper {
  position: relative;
  height: 200px;
  overflow: hidden;
  background-color: var(--earth-beige);
  display: flex;
  align-items: center;
  justify-content: center;
}

.science-img-wrapper svg {
  width: 80px;
  height: 80px;
  opacity: 0.8;
  transition: var(--transition-normal);
}

.science-card:hover .science-img-wrapper svg {
  transform: scale(1.1) rotate(5deg);
}

.science-card.color-1 .science-img-wrapper { background: linear-gradient(135deg, #e0f2fe 0%, #b3e5fc 100%); }
.science-card.color-2 .science-img-wrapper { background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%); }
.science-card.color-3 .science-img-wrapper { background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%); }

.science-card-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.science-date {
  font-size: 0.8rem;
  color: var(--text-light);
  font-weight: 600;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.science-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text-main);
  transition: var(--transition-fast);
}

.science-card:hover .science-card-title {
  color: var(--sky-blue-hover);
}

.science-card-excerpt {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.science-read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--sky-blue-hover);
  cursor: pointer;
}

.science-read-more i {
  transition: var(--transition-fast);
}

.science-card:hover .science-read-more i {
  transform: translateX(4px);
}

/* ==========================================================================
   Product Showcase / Portfolio Section
   ========================================================================== */
.portfolio {
  background-color: var(--bg-primary);
}

.portfolio-filters {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 20px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  border-radius: 30px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
}

.filter-btn:hover {
  background-color: var(--sky-blue-soft);
  border-color: var(--sky-blue);
  color: var(--sky-blue-hover);
}

.filter-btn.active {
  background-color: var(--sky-blue);
  border-color: var(--sky-blue);
  color: white;
  box-shadow: var(--shadow-sm);
}

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

.portfolio-item {
  background-color: var(--bg-secondary);
  border-radius: 20px;
  border: 1px solid var(--border-light);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

.portfolio-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
}

.portfolio-img-wrapper {
  height: 220px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--earth-beige);
}

.portfolio-img-wrapper svg {
  width: 90px;
  height: 90px;
  opacity: 0.8;
  transition: var(--transition-slow);
}

.portfolio-item:hover .portfolio-img-wrapper svg {
  transform: scale(1.15) rotate(-3deg);
}

.portfolio-item.cate-agri .portfolio-img-wrapper { background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%); }
.portfolio-item.cate-chem .portfolio-img-wrapper { background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%); }
.portfolio-item.cate-material .portfolio-img-wrapper { background: linear-gradient(135deg, #e0f2fe 0%, #b3e5fc 100%); }

.portfolio-body {
  padding: 24px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.portfolio-category {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-light);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.portfolio-item.cate-agri .portfolio-category { color: var(--plant-green); }
.portfolio-item.cate-chem .portfolio-category { color: var(--earth-dark); }
.portfolio-item.cate-material .portfolio-category { color: var(--sky-blue-hover); }

.portfolio-title {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text-main);
}

.portfolio-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==========================================================================
   Contact Us Section
   ========================================================================== */
.contact {
  background-color: var(--bg-secondary);
}

.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 60px;
  align-items: flex-start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.contact-info-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--sky-blue-hover), var(--plant-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.contact-info-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
}

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

.contact-detail-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-detail-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-color: var(--sky-blue-soft);
  color: var(--sky-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-detail-text h5 {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-main);
  margin-bottom: 2px;
}

.contact-detail-text p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.social-links {
  display: flex;
  gap: 12px;
  margin-top: 10px;
}

.social-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 1.1rem;
  transition: var(--transition-normal);
}

.social-btn:hover {
  background-color: var(--sky-blue);
  color: white;
  border-color: var(--sky-blue);
  transform: translateY(-3px);
}

.contact-form-card {
  background-color: var(--bg-primary);
  border-radius: 20px;
  border: 1px solid var(--border-light);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group.full-width {
  grid-column: span 2;
}

.form-label {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-main);
}

.form-input, .form-textarea {
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  background-color: var(--bg-secondary);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text-main);
  transition: var(--transition-normal);
  outline: none;
}

.form-input:focus, .form-textarea:focus {
  border-color: var(--sky-blue);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
}

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

.form-message {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 0.9rem;
  font-weight: 600;
  display: none;
  animation: fadeIn 0.4s forwards;
}

.form-message.success {
  background-color: var(--plant-green-light);
  color: var(--plant-green-hover);
  border: 1px solid rgba(16, 185, 129, 0.2);
  display: block;
}

.form-message.error {
  background-color: #fee2e2;
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.2);
  display: block;
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-light);
  padding: 60px 24px 30px;
}

.footer-grid {
  max-width: var(--max-width);
  margin: 0 auto 40px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr 1.2fr;
  gap: 40px;
  padding: 0 24px;
}

.footer-brand-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 16px 0 24px;
  max-width: 280px;
}

.footer-col h4 {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 20px;
  color: var(--text-main);
}

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

.footer-link {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-link:hover {
  color: var(--sky-blue-hover);
  padding-left: 4px;
}

.newsletter-form {
  display: flex;
  gap: 8px;
}

.newsletter-input {
  flex-grow: 1;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  background-color: var(--bg-secondary);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
}

.newsletter-input:focus {
  border-color: var(--sky-blue);
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 30px 24px 0;
  border-top: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-light);
  font-weight: 500;
}

/* ==========================================================================
   Modals (科普文章 & 專案彈窗)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: fadeIn 0.3s forwards;
}

.modal-card {
  background-color: var(--bg-secondary);
  border-radius: 24px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 750px;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  animation: scaleIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  color: var(--text-muted);
  transition: var(--transition-normal);
}

.modal-close-btn:hover {
  background-color: #fee2e2;
  color: #ef4444;
  transform: rotate(90deg);
}

.modal-header-img {
  height: 250px;
  background-color: var(--earth-beige);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-header-img.color-1 { background: linear-gradient(135deg, #e0f2fe 0%, #b3e5fc 100%); }
.modal-header-img.color-2 { background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%); }
.modal-header-img.color-3 { background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%); }

.modal-header-img svg {
  width: 120px;
  height: 120px;
  opacity: 0.9;
}

.modal-body {
  padding: 40px;
}

.modal-category {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--sky-blue-hover);
  margin-bottom: 12px;
}

.modal-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 24px;
}

.modal-content {
  color: var(--text-main);
  font-size: 1.05rem;
  line-height: 1.7;
}

.modal-content p {
  margin-bottom: 20px;
}

.modal-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 32px 0 16px;
  color: var(--text-main);
  border-left: 4px solid var(--sky-blue);
  padding-left: 12px;
}

.modal-content ul, .modal-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.modal-content li {
  margin-bottom: 8px;
}

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

@keyframes float {
  0% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-12px);
  }
  100% {
    transform: translateY(0px);
  }
}

/* ==========================================================================
   Video Section (YouTube Integration)
   ========================================================================== */
.video-section {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

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

.video-card {
  background-color: var(--bg-primary);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

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

.video-thumbnail {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: #000;
  overflow: hidden;
}

.video-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-normal);
}

.video-card:hover .video-thumbnail img {
  transform: scale(1.05);
  opacity: 0.95;
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(1);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ef4444, #dc2626); /* YouTube red gradient */
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.8rem;
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
  transition: var(--transition-normal);
  z-index: 2;
}

.video-card:hover .video-play-btn {
  transform: translate(-50%, -50%) scale(1.15);
  background: linear-gradient(135deg, #ff0000, #cc0000);
  box-shadow: 0 8px 25px rgba(255, 0, 0, 0.5);
}

.video-info {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.video-tag {
  display: inline-block;
  align-self: flex-start;
  padding: 4px 10px;
  background-color: var(--sky-blue-soft);
  color: var(--sky-blue-hover);
  border-radius: 30px;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.video-card:nth-child(2) .video-tag {
  background-color: var(--plant-green-light);
  color: var(--plant-green-hover);
}

.video-card:nth-child(3) .video-tag {
  background-color: var(--earth-beige);
  color: var(--earth-dark);
}

.video-title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 10px;
  color: var(--text-main);
  transition: var(--transition-normal);
}

.video-card:hover .video-title {
  color: var(--sky-blue-hover);
}

.video-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

/* ==========================================================================
   Product Detail Page Styles
   ========================================================================== */
.product-detail-layout {
  padding: 120px 24px 80px;
  background-color: var(--bg-secondary);
}

.product-detail-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
}

.product-sidebar {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 20px;
  padding: 30px 24px;
  position: sticky;
  top: 100px;
  box-shadow: var(--shadow-sm);
  z-index: 10;
}

.sidebar-title {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 12px;
}

.sidebar-menu {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition-normal);
  border: 1px solid transparent;
}

.sidebar-item:hover {
  background-color: var(--sky-blue-soft);
  color: var(--sky-blue-hover);
}

.sidebar-item.active {
  background-color: var(--sky-blue-light);
  border-color: var(--sky-blue);
  color: var(--sky-blue-hover);
}

.sidebar-item-icon {
  font-size: 1.1rem;
}

.product-main-content {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 24px;
  padding: 48px;
  box-shadow: var(--shadow-sm);
  animation: fadeIn 0.5s forwards;
}

.product-detail-header {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 30px;
  margin-bottom: 36px;
}

.product-detail-badge {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 30px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.product-detail-badge.badge-agri { background-color: var(--plant-green-light); color: var(--plant-green-hover); }
.product-detail-badge.badge-chem { background-color: var(--earth-beige); color: var(--earth-dark); }
.product-detail-badge.badge-material { background-color: var(--sky-blue-light); color: var(--sky-blue-hover); }

.product-detail-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.product-detail-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.product-spec-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.product-spec-title i {
  color: var(--sky-blue);
}

.product-spec-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.spec-item {
  background-color: var(--bg-secondary);
  border-radius: 12px;
  padding: 20px;
  border: 1px solid var(--border-light);
}

.spec-label {
  font-size: 0.85rem;
  color: var(--text-light);
  font-weight: 600;
  margin-bottom: 6px;
  text-transform: uppercase;
}

.spec-value {
  font-size: 1.05rem;
  color: var(--text-main);
  font-weight: 700;
}

/* Case Study section */
.case-study-section {
  border-top: 1px solid var(--border-light);
  padding-top: 40px;
  margin-top: 40px;
}

.case-study-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.case-study-title i {
  color: var(--plant-green);
}

.case-study-card {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(255, 255, 255, 0.5) 100%);
  border-radius: 20px;
  border: 1px solid var(--border-light);
  padding: 36px;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.case-study-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background: linear-gradient(180deg, var(--plant-green), var(--sky-blue));
}

.case-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.case-company {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
}

.case-tag {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 10px;
  background-color: var(--plant-green-light);
  color: var(--plant-green-hover);
  border-radius: 30px;
}

.case-challenge {
  margin-bottom: 20px;
}

.case-challenge h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #dc2626;
  margin-bottom: 6px;
  margin-top: 0;
}

.case-solution {
  margin-bottom: 20px;
}

.case-solution h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--plant-green-hover);
  margin-bottom: 6px;
  margin-top: 0;
}

.case-result {
  background-color: rgba(16, 185, 129, 0.06);
  border-radius: 12px;
  padding: 16px 20px;
  border: 1px solid rgba(16, 185, 129, 0.12);
}

.case-result h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--plant-green-hover);
  margin-bottom: 8px;
  margin-top: 0;
}

.case-result p {
  font-size: 0.95rem;
  color: var(--text-main);
  font-weight: 600;
  margin: 0;
  line-height: 1.5;
}


/* ==========================================================================
   Discussion Forum Page Styles
   ========================================================================== */
.forum-section {
  background-color: var(--bg-secondary);
  padding: 80px 24px;
}

.forum-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  flex-wrap: wrap;
  gap: 20px;
  background-color: var(--bg-primary);
  padding: 20px 24px;
  border-radius: 16px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.forum-user-status {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.95rem;
}

.status-logged-in {
  color: var(--text-main);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-logged-in span {
  color: var(--sky-blue-hover);
}

.btn-logout {
  background: none;
  border: none;
  color: #ef4444;
  font-weight: 700;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  font-size: 0.85rem;
}

.btn-logout:hover {
  color: #dc2626;
}

.forum-posts-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.forum-post-card {
  background-color: var(--bg-primary);
  border-radius: 20px;
  border: 1px solid var(--border-light);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

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

.post-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}

.post-meta-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.post-category-tag {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 30px;
}

.tag-chem { background-color: var(--earth-beige); color: var(--earth-dark); }
.tag-measure { background-color: var(--sky-blue-light); color: var(--sky-blue-hover); }
.tag-agri { background-color: var(--plant-green-light); color: var(--plant-green-hover); }
.tag-auto { background-color: #fee2e2; color: #ef4444; }

.post-author {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.post-date {
  font-size: 0.85rem;
  color: var(--text-light);
}

.post-like-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  padding: 6px 12px;
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-normal);
}

.post-like-btn:hover {
  background-color: #fee2e2;
  color: #ef4444;
  border-color: #fca5a5;
}

.post-like-btn.liked {
  background-color: #fee2e2;
  color: #ef4444;
  border-color: #ef4444;
}

.forum-post-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.forum-post-body {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  white-space: pre-line;
}

.post-actions-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
}

.btn-toggle-replies {
  background: none;
  border: none;
  color: var(--sky-blue-hover);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-toggle-replies:hover {
  color: var(--sky-blue);
}

/* Replies Area */
.post-replies-area {
  margin-top: 20px;
  border-top: 1px dashed var(--border-light);
  padding-top: 20px;
}

.replies-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 20px;
}

.reply-card {
  background-color: var(--bg-secondary);
  border-radius: 12px;
  padding: 16px 20px;
  border: 1px solid var(--border-light);
}

.reply-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 8px;
  font-weight: 600;
}

.reply-author {
  color: var(--text-muted);
}

.reply-body {
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.5;
  white-space: pre-line;
}

.reply-form {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.reply-textarea {
  flex-grow: 1;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  padding: 10px 14px;
  font-family: inherit;
  font-size: 0.9rem;
  height: 42px;
  resize: none;
  outline: none;
  transition: var(--transition-normal);
}

.reply-textarea:focus {
  border-color: var(--sky-blue);
  height: 80px;
}

/* Modal and Form inputs */
.modal-overlay.active {
  display: flex;
}

.modal-form-group {
  margin-bottom: 20px;
}

.modal-form-label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-main);
  margin-bottom: 8px;
}

.modal-form-select {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  background-color: var(--bg-secondary);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text-main);
  outline: none;
}

.modal-form-select:focus {
  border-color: var(--sky-blue);
}

/* Countdown and Login Specifics */
.countdown-box {
  display: flex;
  gap: 10px;
}

.btn-countdown {
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  background-color: var(--bg-secondary);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-normal);
}

.btn-countdown:hover:not(:disabled) {
  background-color: var(--sky-blue-soft);
  color: var(--sky-blue-hover);
  border-color: var(--sky-blue);
}

.btn-countdown:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}


/* ==========================================================================
   Floating Pineapple Animation
   ========================================================================== */
.hero {
  position: relative;
  overflow: hidden; /* Ensure pineapples do not spill outside */
}

.pineapple-float-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none; /* Do not block clicks */
  z-index: 1;
}

.floating-pineapple {
  position: absolute;
  opacity: 0.12; /* Watermark opacity for standard colors to be visible but subtle */
  animation: floatAround 20s infinite ease-in-out;
  will-change: transform;
}

.floating-pineapple:nth-child(1) {
  top: 15%;
  left: 8%;
  width: 90px;
  height: 90px;
  animation-duration: 25s;
  animation-delay: 0s;
}

.floating-pineapple:nth-child(2) {
  top: 55%;
  left: 85%;
  width: 120px;
  height: 120px;
  animation-duration: 30s;
  animation-delay: -5s;
}

.floating-pineapple:nth-child(3) {
  top: 75%;
  left: 12%;
  width: 70px;
  height: 70px;
  animation-duration: 22s;
  animation-delay: -8s;
}

.floating-pineapple:nth-child(4) {
  top: 25%;
  left: 78%;
  width: 100px;
  height: 100px;
  animation-duration: 28s;
  animation-delay: -12s;
}

.floating-pineapple:nth-child(5) {
  top: 40%;
  left: 45%;
  width: 80px;
  height: 80px;
  animation-duration: 35s;
  animation-delay: -3s;
  opacity: 0.08; /* Slightly more subtle for the center element */
}

@keyframes floatAround {
  0% {
    transform: translateY(0) translateX(0) rotate(0deg);
  }
  33% {
    transform: translateY(-25px) translateX(15px) rotate(8deg);
  }
  66% {
    transform: translateY(15px) translateX(-20px) rotate(-12deg);
  }
  100% {
    transform: translateY(0) translateX(0) rotate(0deg);
  }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .services-grid, .science-grid, .portfolio-grid, .video-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .selector-panel {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px;
  }
  
  .result-panel {
    min-height: auto;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
  
  .footer-col:last-child {
    grid-column: span 3;
  }

  .product-detail-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .product-sidebar {
    position: static;
    padding: 20px;
  }
  
  .sidebar-menu {
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }
  
  .sidebar-item {
    white-space: nowrap;
  }
}

@media (max-width: 768px) {
  section {
    padding: 70px 16px;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .hero {
    height: auto;
    padding: 140px 16px 80px;
  }
  
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-image-wrapper {
    order: -1;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .services-grid, .science-grid, .portfolio-grid, .video-grid {
    grid-template-columns: 1fr;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .form-group.full-width {
    grid-column: span 1;
  }

  .product-main-content {
    padding: 30px 20px;
  }
  
  .product-spec-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .case-study-card {
    padding: 24px;
  }
  
  /* Mobile Menu navigation */
  .hamburger {
    display: block;
    z-index: 1001;
  }
  
  .hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }
  
  .hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
  
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background-color: var(--bg-secondary);
    box-shadow: var(--shadow-lg);
    flex-direction: column;
    justify-content: center;
    gap: 40px;
    padding: 40px;
    transition: var(--transition-normal);
    z-index: 1000;
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  .nav-cta {
    display: none;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .footer-col {
    grid-column: span 1 !important;
  }
}