/* =========================================
   CKP Official Website - Main Styles
   ========================================= */

/* --- Variables & Tokens --- */
:root {
  /* Colors */
  --color-primary: #1a2c4e;     /* Navy Blue */
  --color-text-main: #333333;
  --color-text-light: #666666;
  --color-bg-light: #f4f7f9;
  --color-white: #ffffff;
  --color-accent: #e67e22;      /* Orange */
  --color-accent-hover: #d35400;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI", sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;

  /* Spacing */
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 32px;
  --spacing-xl: 64px;
  --container-width: 1100px;
  --header-height: 70px;
}

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

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text-main);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
  transition: opacity 0.2s ease, color 0.2s ease;
}

ul {
  list-style: none;
}

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

/* --- Typography Utilities --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }

/* --- Layout Utilities --- */
.container {
  width: 90%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
}

.section-title {
  font-size: 2rem;
  text-align: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
  display: inline-block;
  width: 100%;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background-color: var(--color-accent);
  margin: var(--spacing-sm) auto 0;
}

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

/* --- Components: Buttons --- */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 4px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.3s ease;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-white);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
}

/* --- Components: Header --- */
.site-header {
  background-color: var(--color-white);
  height: var(--header-height);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.site-logo a {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
}

/* Desktop Navigation */
.nav-list {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-item a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-primary);
}

.nav-item a:hover {
  color: var(--color-accent);
}

/* Mobile Navigation Toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--color-primary);
  transition: all 0.3s ease;
}

/* --- Components: Footer --- */
.site-footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-lg) 0;
  font-size: 0.9rem;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  text-align: center;
}

.footer-links a {
  margin: 0 var(--spacing-sm);
  color: #ccc;
}

.footer-links a:hover {
  color: var(--color-white);
}

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

.card {
  background: var(--color-white);
  border: 1px solid #eee;
  border-radius: 8px;
  padding: var(--spacing-lg);
  box-shadow: 0 4px 6px rgba(0,0,0,0.02);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px rgba(0,0,0,0.05);
}

.card h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
}

.card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-md);
}

/* --- Page Specific Styles --- */

/* Hero Section */
.hero {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 100px 0;
  text-align: center;
  background-image: linear-gradient(rgba(26, 44, 78, 0.9), rgba(26, 44, 78, 0.9)); /* Overlay for text readability if bg image is added */
}

.hero h1 {
  font-size: 2.5rem;
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
  opacity: 0.9;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
}

/* Breadcrumbs (Optional but good for subpages) */
.page-header {
  background-color: var(--color-bg-light);
  padding: var(--spacing-lg) 0;
  text-align: center;
  border-bottom: 1px solid #eee;
}

.page-header h1 {
  margin-bottom: 0;
}

/* Contact Form */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--color-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1rem;
  font-family: inherit;
}

.form-group textarea {
  height: 150px;
  resize: vertical;
}

/* --- Media Queries --- */
@media (max-width: 768px) {
  .nav-list {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--color-white);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    gap: 0;
  }
  
  .nav-list.active {
    display: flex;
  }

  .nav-item {
    width: 100%;
    border-bottom: 1px solid #f0f0f0;
  }

  .nav-item:last-child {
    border-bottom: none;
  }

  .nav-item a {
    display: block;
    padding: 15px 0;
    font-size: 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .hero h1 {
    font-size: 1.8rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 300px;
  }
}