/* ==========================================
   Hankook Pharm Holdings - Global Styles
   Design Concept: "Holographic Wellness"
   ========================================== */

/* ==========================================
   CSS Variables (Design System) - Clean & Eco-Science
   ========================================== */
:root {
  /* Primary Colors - Clean & Eco-Science */
  --primary-deep-teal: #006D77;
  --primary-soft-sage: #83C5BE;
  --primary-teal: #14B8A6;
  
  /* Accent Colors */
  --accent-sage-light: #A8DADC;
  --accent-sage-dark: #4A5C5A;
  --accent-white: #FFFFFF;
  
  /* Neutral Colors - Eco-friendly */
  --neutral-off-white: #F9FAFB;
  --neutral-light-sage: #E9F5F4;
  --neutral-soft-grey: #6B7280;
  --neutral-dark-grey: #374151;
  --neutral-white: #FFFFFF;
  --neutral-light: #F8FAFC;
  --neutral-grey: #94A3B8;
  --neutral-dark: #1E293B;
  
  /* Gradients - Clean & Eco-Science */
  --gradient-main: linear-gradient(135deg, var(--primary-deep-teal) 0%, var(--primary-soft-sage) 100%);
  --gradient-soft: linear-gradient(135deg, var(--primary-soft-sage) 0%, var(--accent-sage-light) 100%);
  --gradient-eco: linear-gradient(135deg, var(--primary-deep-teal) 0%, var(--accent-sage-light) 100%);
  --gradient-hero: linear-gradient(135deg, var(--primary-deep-teal) 0%, var(--primary-soft-sage) 50%, var(--accent-sage-light) 100%);
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-bg-dark: rgba(15, 23, 42, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-border-dark: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
  
  /* White Space (여백의 미) */
  --spacing-section: 120px;
  --spacing-section-mobile: 60px;
  --spacing-card: 40px;
  --spacing-card-mobile: 20px;
  --spacing-text: 48px;
  --spacing-text-mobile: 24px;
  
  /* Typography */
  --font-primary: 'Inter', 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-size-h1: 4rem;
  --font-size-h2: 3rem;
  --font-size-h3: 2rem;
  --font-size-body: 1rem;
  --line-height: 1.8;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.6s ease;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 14px rgba(139, 92, 246, 0.4);
  --shadow-lg: 0 6px 20px rgba(139, 92, 246, 0.5);
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
}

/* ==========================================
   CSS Reset & Base Styles
   ========================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

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

/* ==========================================
   Typography - Pretendard, Light Weight
   ========================================== */
body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-weight: 400;
  line-height: var(--line-height);
  color: var(--neutral-dark-grey);
  background-color: var(--neutral-off-white);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 300; /* Light weight for clean feel */
  line-height: 1.4;
  margin-bottom: var(--spacing-text);
  color: var(--primary-deep-teal);
}

h1 {
  font-size: var(--font-size-h1);
  font-weight: 200; /* Extra light for elegant feel */
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-h2);
  font-weight: 300;
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--font-size-h3);
  font-weight: 400;
}

p {
  margin-bottom: var(--spacing-text-mobile);
}

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

/* ==========================================
   Glassmorphism Navigation
   ========================================== */
.glassmorphism-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 20px 80px;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border-dark);
  box-shadow: var(--glass-shadow);
  transition: all var(--transition-medium);
  z-index: 1000;
}

.glassmorphism-nav.transparent {
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--glass-border-dark);
  box-shadow: none;
}

.glassmorphism-nav .nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
}

.glassmorphism-nav .logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: white;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.7), 0 0 20px rgba(255, 255, 255, 0.4);
  filter: drop-shadow(0 0 15px rgba(255, 255, 255, 0.3));
  letter-spacing: -0.5px;
}

.glassmorphism-nav .nav-links {
  display: flex;
  gap: 40px;
  list-style: none;
}

.glassmorphism-nav .nav-links a {
  font-weight: 500;
  position: relative;
  padding: 12px 20px;
  border-radius: var(--radius-lg);
  transition: all var(--transition-medium);
  display: inline-block;
  background: transparent;
  color: var(--neutral-white);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5), 0 0 15px rgba(255, 255, 255, 0.2);
}

.glassmorphism-nav .nav-links a:hover {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: var(--primary-deep-teal);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 109, 119, 0.15);
  text-shadow: none;
}

.glassmorphism-nav .nav-links a::after {
  content: '';
  position: absolute;
  bottom: 8px;
  left: 50%;
  width: 0;
  height: 3px;
  background: var(--gradient-main);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition-medium);
}

.glassmorphism-nav .nav-links a:hover::after {
  width: 80%;
}

/* ==========================================
   Micro-interaction Button
   ========================================== */
.micro-interaction-button {
  position: relative;
  padding: 16px 32px;
  background: var(--gradient-mystic);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
}

.micro-interaction-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.micro-interaction-button:active {
  transform: translateY(2px) scale(0.98);
  box-shadow: var(--shadow-sm);
}

/* Ripple Effect */
.micro-interaction-button::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transform: translate(-50%, -50%);
  transition: width var(--transition-slow), height var(--transition-slow);
}

.micro-interaction-button:active::after {
  width: 300px;
  height: 300px;
}

/* Button Variants */
.micro-interaction-button.btn-primary {
  background: var(--gradient-holographic);
  color: var(--neutral-white);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.micro-interaction-button.btn-secondary {
  background: linear-gradient(135deg, var(--primary-teal) 0%, var(--primary-violet) 100%);
}

.micro-interaction-button.btn-outline {
  background: transparent;
  border: 2px solid var(--neutral-white);
  color: var(--neutral-white);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.micro-interaction-button.btn-outline:hover {
  background: var(--neutral-white);
  color: var(--primary-deep-teal);
  text-shadow: none;
}

/* ==========================================
   Section Spacing (여백의 미)
   ========================================== */
section {
  padding: var(--spacing-section) 80px;
  position: relative;
}

section + section {
  margin-top: var(--spacing-section);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  margin-bottom: 80px;
}

.section-title h2 {
  font-size: 3rem;
  margin-bottom: 24px;
}

.section-title p {
  font-size: 1.25rem;
  color: var(--neutral-grey);
}

/* ==========================================
   Card Styles
   ========================================== */
.card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-medium);
}

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

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-card);
}

/* Glass Card */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--glass-shadow);
}

/* ==========================================
   Bento Grid Layout
   ========================================== */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--spacing-card);
  margin-top: 60px;
}

.bento-item {
  border-radius: var(--radius-lg);
  padding: 40px;
  background: white;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-medium);
}

.bento-item:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.bento-item.large {
  grid-column: span 6;
}

.bento-item.medium {
  grid-column: span 4;
}

.bento-item.small {
  grid-column: span 3;
}

/* ==========================================
   Holographic Background
   ========================================== */
.holographic-bg {
  position: relative;
  background: var(--gradient-hero);
  overflow: hidden;
}

.holographic-bg::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: 
    radial-gradient(circle at 20% 50%, rgba(139, 92, 246, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(20, 184, 166, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 40% 90%, rgba(251, 113, 133, 0.3) 0%, transparent 50%);
  animation: holographic-rotate 20s linear infinite;
}

@keyframes holographic-rotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

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

.fade-in-up {
  animation: fadeInUp 0.8s ease-out forwards;
}

.fade-in-up.delay-1 { animation-delay: 0.2s; }
.fade-in-up.delay-2 { animation-delay: 0.4s; }
.fade-in-up.delay-3 { animation-delay: 0.6s; }

/* ==========================================
   Responsive Design
   ========================================== */
/* Tablet (768px ~ 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
  :root {
    --font-size-h1: 3rem;
    --font-size-h2: 2.5rem;
    --font-size-h3: 1.75rem;
  }
  
  section {
    padding: 80px 60px;
  }
  
  section + section {
    margin-top: 80px;
  }
  
  .glassmorphism-nav {
    padding: 20px 60px;
  }
  
  .bento-item.large,
  .bento-item.medium,
  .bento-item.small {
    grid-column: span 6;
  }
}

/* Mobile (~ 767px) */
@media (max-width: 767px) {
  :root {
    --font-size-h1: 2rem;
    --font-size-h2: 1.75rem;
    --font-size-h3: 1.5rem;
  }
  
  section {
    padding: var(--spacing-section-mobile) 24px;
  }
  
  section + section {
    margin-top: var(--spacing-section-mobile);
  }
  
  .glassmorphism-nav {
    padding: 16px 24px;
  }
  
  .glassmorphism-nav .nav-links {
    display: none;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-card-mobile);
  }
  
  .bento-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-card-mobile);
  }
  
  .bento-item.large,
  .bento-item.medium,
  .bento-item.small {
    grid-column: span 1;
  }
  
  .micro-interaction-button {
    width: 100%;
    padding: 14px 24px;
  }
}

/* ==========================================
   Utility Classes
   ========================================== */
.text-center { text-align: center; }
.text-gradient {
  background: var(--gradient-holographic);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mt-1 { margin-top: 20px; }
.mt-2 { margin-top: 40px; }
.mt-3 { margin-top: 60px; }
.mt-4 { margin-top: 80px; }

.mb-1 { margin-bottom: 20px; }
.mb-2 { margin-bottom: 40px; }
.mb-3 { margin-bottom: 60px; }
.mb-4 { margin-bottom: 80px; }

.hidden { display: none; }
.visible { display: block; }

/* ==========================================
   Tailwind CSS Integration & Custom Animations
   ========================================== */
/* Video Hero Section */
#hero {
  position: relative;
  height: 100vh;
  overflow: hidden;
}

#hero video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

#hero .bg-gradient-to-r {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
}

#hero .hero-content {
  position: relative;
  z-index: 10;
}

/* Custom Animations */
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

.animation-delay-2 {
  animation-delay: 2s;
}

.animation-delay-3 {
  animation-delay: 3s;
}

.animation-delay-4 {
  animation-delay: 4s;
}

/* Particles Animation */
.particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 3;
}

.particle {
  opacity: 0.6;
  animation: float 8s ease-in-out infinite;
}

.particle:nth-child(2) {
  animation-delay: 2s;
}

.particle:nth-child(3) {
  animation-delay: 3s;
}

.particle:nth-child(4) {
  animation-delay: 4s;
}