/* ============================================
   OLYTHUS - Main Stylesheet
   Educational Panel System Design
   ============================================ */

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

:root {
  --primary: #0F2C59;
  --primary-light: #1a3a75;
  --secondary: #E8E8E8;
  --accent-green: #7D9D9C;
  --accent-gold: #C8A870;
  --neutral-dark: #333333;
  --neutral-medium: #666666;
  --neutral-light: #f5f5f5;
  --white: #ffffff;
  
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;
  
  --transition-fast: 0.2s ease-in-out;
  --transition-smooth: 0.4s ease-in-out;
}

html, body {
  font-family: 'Open Sans', 'Lato', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--neutral-dark);
  background-color: var(--white);
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Montserrat', 'Oswald', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--spacing-md);
  color: var(--primary);
}

h1 {
  font-size: 3rem;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-lg);
  font-weight: 700;
}

h2 {
  font-size: 2rem;
  letter-spacing: 0.02em;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 1.5rem;
  letter-spacing: 0.01em;
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--neutral-medium);
  line-height: 1.8;
}

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

a:hover {
  color: var(--accent-gold);
  text-decoration: underline;
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  align-items: center;
}

.col-6 {
  flex: 1;
  min-width: 300px;
}

.col-full {
  flex: 1 1 100%;
}

@media (max-width: 768px) {
  .col-6 {
    flex: 1 1 100%;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

header {
  background-color: var(--white);
  border-bottom: 1px solid var(--secondary);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.logo:hover {
  color: var(--accent-green);
}

nav {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

nav a {
  color: var(--neutral-medium);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  text-decoration: none;
}

nav a:hover,
nav a.active {
  color: var(--accent-green);
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--primary);
  margin: 4px 0;
  transition: background-color var(--transition-fast);
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
  
  nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--white);
    border-bottom: 1px solid var(--secondary);
    gap: 0;
    padding: var(--spacing-md) 0;
  }
  
  nav a {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-bottom: 1px solid var(--secondary);
  }
  
  nav.open {
    display: flex;
  }
}

/* ============================================
   FOOTER
   ============================================ */

footer {
  background-color: var(--primary);
  color: var(--white);
  padding: var(--spacing-xxl) 0 var(--spacing-lg);
  margin-top: var(--spacing-xxl);
}

footer p {
  color: rgba(255, 255, 255, 0.8);
}

footer a {
  color: var(--accent-gold);
}

footer a:hover {
  color: var(--secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
  color: var(--accent-gold);
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
}

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

.footer-section li {
  margin-bottom: var(--spacing-sm);
  line-height: 1.8;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  background-color: var(--primary);
  color: var(--white);
  padding: var(--spacing-xxl) 0;
  position: relative;
  overflow: hidden;
}

.hero-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.hero-text h1 {
  color: var(--white);
  margin-bottom: var(--spacing-md);
}

.hero-text p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-lg);
}

.hero-image {
  flex: 1;
  min-width: 300px;
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
  max-width: 500px;
}

@media (max-width: 768px) {
  .hero-content {
    flex-direction: column;
  }
  
  .hero {
    padding: var(--spacing-xl) 0;
  }
}

/* ============================================
   PANEL SYSTEM
   ============================================ */

.panel {
  background-color: var(--secondary);
  border: 1px solid #ddd;
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  transition: box-shadow var(--transition-smooth);
}

.panel:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

.panel.accent h2,
.panel.accent h3 {
  color: var(--accent-gold);
}

.section {
  padding: var(--spacing-xxl) 0;
  border-bottom: 1px solid var(--secondary);
}

.section:last-child {
  border-bottom: none;
}

/* ============================================
   GRID SYSTEM
   ============================================ */

.grid {
  display: grid;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   CARDS
   ============================================ */

.card {
  background-color: var(--white);
  border: 1px solid #ddd;
  padding: var(--spacing-lg);
  text-align: center;
  transition: all var(--transition-smooth);
}

.card:hover {
  border-color: var(--accent-green);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  transform: translateY(-4px);
}

.card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  margin-bottom: var(--spacing-md);
  border-radius: 4px;
}

.card h3 {
  margin-bottom: var(--spacing-sm);
}

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

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--primary);
  color: var(--white);
  border: 2px solid var(--primary);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-fast);
  cursor: pointer;
  font-size: 0.95rem;
}

.btn:hover {
  background-color: var(--primary-light);
  border-color: var(--primary-light);
  transform: translateY(-2px);
}

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

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

.btn-accent {
  background-color: var(--accent-green);
  border-color: var(--accent-green);
}

.btn-accent:hover {
  background-color: #6a8787;
  border-color: #6a8787;
}

/* ============================================
   IMAGES
   ============================================ */

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

.img-container {
  margin: var(--spacing-lg) 0;
  text-align: center;
}

.img-full {
  width: 100%;
  height: auto;
}

.img-sidebar {
  max-width: 100%;
  border-radius: 4px;
}

/* ============================================
   FORMS
   ============================================ */

form {
  margin: var(--spacing-lg) 0;
}

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

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--neutral-dark);
}

input[type="text"],
input[type="email"],
input[type="tel"],
textarea,
select {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid #ccc;
  border-radius: 4px;
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition-fast);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent-green);
  box-shadow: 0 0 0 3px rgba(125, 157, 156, 0.1);
}

textarea {
  min-height: 150px;
  resize: vertical;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.text-left {
  text-align: left;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xxl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xxl); }

.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xxl); }

.hidden {
  display: none !important;
}

.highlight {
  background-color: var(--accent-gold);
  color: var(--white);
  padding: 2px 6px;
  border-radius: 2px;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.75rem;
  }
  
  h2 {
    font-size: 1.25rem;
  }
  
  h3 {
    font-size: 1.1rem;
  }
  
  p {
    font-size: 0.95rem;
  }
}