/* Main Styles for Koreapedia */

/* Global Styles - Using Obangsaek Color System */
:root {
  /* Traditional Korean Obangsaek Colors */
  --obangsaek-red: #E63946;    /* Red (적/朱) - Passion, South, Fire, Summer, Vermilion Bird */
  --obangsaek-blue: #457B9D;   /* Blue (청/靑) - Integrity, East, Wood, Spring, Azure Dragon */
  --obangsaek-yellow: #F9C74F; /* Yellow (황/黃) - Wealth, Central, Earth, Yellow Emperor */
  --obangsaek-white: #F1FAEE;  /* White (백/白) - Nonpossession, West, Metal, Autumn, White Tiger */
  --obangsaek-black: #1D3557;  /* Black (흑/黑) - Wisdom, North, Water, Winter, Black Tortoise */
  
  /* Secondary colors */
  --light-gray: #F8F9FA;
  --dark-gray: #212529;
  
  /* Animation timing */
  --transition-slow: 0.5s ease;
  --transition-medium: 0.3s ease;
  --transition-fast: 0.2s ease;
}

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

body {
  font-family: 'Noto Serif', serif;
  line-height: 1.6;
  color: var(--dark-gray);
  background-color: white;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Open Sans', sans-serif;
  margin-bottom: 1rem;
  color: var(--obangsaek-black);
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--obangsaek-blue);
  text-decoration: none;
  transition: color var(--transition-medium);
  position: relative;
}

a:hover {
  color: var(--obangsaek-red);
}

a.animated-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -2px;
  left: 0;
  background-color: var(--obangsaek-red);
  transition: width var(--transition-medium);
}

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--obangsaek-red);
  color: var(--obangsaek-white);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: bold;
  text-transform: uppercase;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.1);
  transition: left var(--transition-medium);
  z-index: -1;
}

.btn:hover {
  background-color: #c62d3b;
  color: var(--obangsaek-white);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn:hover::before {
  left: 100%;
}

.btn-secondary {
  background-color: var(--obangsaek-blue);
}

.btn-secondary:hover {
  background-color: #3a6985;
}

/* Header Styles */
header {
  background-color: white;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}

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

.logo img {
  height: 50px;
  margin-right: 10px;
}

nav ul {
  display: flex;
  list-style: none;
}

nav ul li {
  margin-left: 20px;
}

nav ul li a {
  font-weight: 600;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--obangsaek-black);
}

/* Hero Section */
.hero {
  background-image: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)), url('../images/korean_hanbok_woman.jpeg');
  background-size: cover;
  background-position: center;
  height: 70vh;
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--obangsaek-white);
  margin-top: 80px;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 0;
  color: var(--obangsaek-white);
}

.hero .tagline {
  font-size: 1.5rem;
  margin-top: 5px;
  margin-bottom: 15px;
  font-family: 'Noto Sans KR', sans-serif;
  font-weight: 500;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 30px;
}

/* About Section */
.about {
  padding: 80px 0 0 0;
  background-color: white;
}

.about-content {
  display: flex;
  align-items: center;
  gap: 40px;
}

.about-text {
  flex: 1;
  text-align: center;
}

.about-image {
  flex: 1;
}

.about-image img {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

/* Features Section */
.features {
  padding: 0 0 80px 0;
  background-color: white;
}

.features-title {
  text-align: center;
  margin-bottom: 50px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.feature-card {
  background-color: var(--obangsaek-white);
  border-radius: 8px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  text-align: center;
  transition: transform var(--transition-medium), box-shadow var(--transition-medium);
  border-top: 4px solid var(--obangsaek-blue);
  position: relative;
  overflow: hidden;
}

.feature-card:nth-child(2) {
  border-top-color: var(--obangsaek-red);
}

.feature-card:nth-child(3) {
  border-top-color: var(--obangsaek-yellow);
}

.feature-card:nth-child(4) {
  border-top-color: var(--obangsaek-black);
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: -4px;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(to right, 
    var(--obangsaek-blue) 0%, 
    var(--obangsaek-blue) 25%, 
    var(--obangsaek-red) 25%, 
    var(--obangsaek-red) 50%, 
    var(--obangsaek-yellow) 50%, 
    var(--obangsaek-yellow) 75%, 
    var(--obangsaek-black) 75%, 
    var(--obangsaek-black) 100%);
  opacity: 0;
  transition: opacity var(--transition-medium);
}

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

.feature-icon {
  font-size: 40px;
  margin-bottom: 20px;
}

.feature-card:nth-child(1) .feature-icon {
  color: var(--obangsaek-blue);
}

.feature-card:nth-child(2) .feature-icon {
  color: var(--obangsaek-red);
}

.feature-card:nth-child(3) .feature-icon {
  color: var(--obangsaek-yellow);
}

.feature-card:nth-child(4) .feature-icon {
  color: var(--obangsaek-black);
}

/* Content Preview Section */
.content-preview {
  padding: 80px 0;
  background-color: var(--light-gray);
}

.preview-title {
  text-align: center;
  margin-bottom: 50px;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.preview-card {
  background-color: var(--obangsaek-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  transition: transform var(--transition-medium), box-shadow var(--transition-medium);
}

.preview-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.preview-image {
  height: 200px;
  overflow: hidden;
  position: relative;
}

.preview-image::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, transparent 70%, rgba(0, 0, 0, 0.3) 100%);
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.preview-card:hover .preview-image::after {
  opacity: 1;
}

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

.preview-card:hover .preview-image img {
  transform: scale(1.05);
}

.preview-content {
  padding: 20px;
}

.preview-content h3 {
  margin-bottom: 10px;
  color: var(--obangsaek-black);
}

/* Registration Section */
.registration {
  padding: 80px 0;
  background-color: var(--obangsaek-blue);
  color: var(--obangsaek-white);
  text-align: center;
}

.registration h2 {
  color: var(--obangsaek-white);
  margin-bottom: 20px;
}

.registration p {
  margin-bottom: 30px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.registration-form {
  max-width: 500px;
  margin: 0 auto;
}

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

.form-group input {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  transition: box-shadow var(--transition-medium);
}

.form-group input:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(69, 123, 157, 0.3);
}

.privacy-notice {
  font-size: 0.8rem;
  margin-top: 15px;
  opacity: 0.8;
}

.success-message {
  background-color: rgba(255, 255, 255, 0.2);
  padding: 20px;
  border-radius: 8px;
  text-align: center;
  animation: fadeIn 0.5s ease;
  margin-top: 20px;
}

.success-message i {
  color: #4CAF50;
  font-size: 2rem;
  margin-bottom: 10px;
  display: block;
}

.error-message {
  background-color: rgba(255, 255, 255, 0.2);
  padding: 20px;
  border-radius: 8px;
  text-align: center;
  animation: fadeIn 0.5s ease;
  margin-top: 20px;
}

.error-message i {
  color: #F44336;
  font-size: 2rem;
  margin-bottom: 10px;
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Footer */
footer {
  background-color: var(--obangsaek-black);
  color: var(--obangsaek-white);
  padding: 50px 0 20px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 30px;
  margin-bottom: 30px;
}

.footer-column {
  flex: 1;
  min-width: 200px;
}

.footer-column h3 {
  color: var(--obangsaek-white);
  margin-bottom: 20px;
  font-size: 1.2rem;
}

.footer-column ul {
  list-style: none;
}

.footer-column ul li {
  margin-bottom: 10px;
}

.footer-column ul li a {
  color: #ccc;
}

.footer-column ul li a:hover {
  color: var(--obangsaek-white);
}

.social-links {
  display: flex;
  gap: 15px;
}

.social-links a {
  color: var(--obangsaek-white);
  font-size: 20px;
}

.copyright {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.9rem;
}

/* Responsive Styles */
@media (max-width: 992px) {
  .about-content {
    flex-direction: column;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }
  
  nav ul {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background-color: var(--obangsaek-white);
    flex-direction: column;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
  }
  
  nav ul.show {
    display: flex;
  }
  
  nav ul li {
    margin: 0;
  }
  
  nav ul li a {
    display: block;
    padding: 15px 20px;
    border-bottom: 1px solid #eee;
  }
  
  .hero {
    height: 50vh;
    margin-top: 70px;
  }
  
  .hero-content {
    padding: 15px;
  }
  
  .hero p {
    font-size: 1rem;
    margin-bottom: 20px;
  }
  
  .btn {
    padding: 8px 16px;
    font-size: 0.9rem;
  }
}

@media (max-width: 576px) {
  .hero {
    height: 45vh;
    margin-top: 60px;
  }
  
  .hero-content {
    padding: 10px;
  }
  
  .hero p {
    font-size: 0.95rem;
    margin-bottom: 15px;
    line-height: 1.3;
  }
  
  .btn {
    padding: 8px 14px;
    font-size: 0.85rem;
  }
  
  .features-grid,
  .preview-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    flex-direction: column;
  }
}