/* ===================================
   VNARION - CSS SYSTEM
   Educational Panel System
   =================================== */

/* ROOT VARIABLES */
:root {
  /* Primary Colors */
  --color-primary: #2C3E50;
  --color-accent-1: #E74C3C;
  --color-accent-2: #F39C12;
  --color-accent-3: #27AE60;
  
  /* Neutrals */
  --color-bg-light: #F5F7FA;
  --color-bg-white: #FFFFFF;
  --color-text-dark: #2C3E50;
  --color-text-light: #7F8C8D;
  --color-border: #ECF0F1;
  
  /* Spacing Base Unit */
  --spacing-unit: 24px;
  --spacing-xs: calc(var(--spacing-unit) / 4);
  --spacing-sm: calc(var(--spacing-unit) / 2);
  --spacing-md: var(--spacing-unit);
  --spacing-lg: calc(var(--spacing-unit) * 1.5);
  --spacing-xl: calc(var(--spacing-unit) * 2);
  --spacing-2xl: calc(var(--spacing-unit) * 3);
  
  /* Typography */
  --font-heading: 'Merriweather', serif;
  --font-body: 'Open Sans', sans-serif;
  
  /* Transitions */
  --transition-smooth: all 0.3s ease;
}

/* ===================================
   RESET & BASE STYLES
   =================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-dark);
  background-color: var(--color-bg-white);
}

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

h1 {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-xl);
  letter-spacing: -0.5px;
}

h2 {
  font-size: 2.8rem;
  margin-bottom: var(--spacing-lg);
}

h3 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

h4 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-dark);
}

a {
  color: var(--color-accent-1);
  text-decoration: none;
  transition: var(--transition-smooth);
}

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

ul, ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

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

/* ===================================
   HEADER & NAVIGATION
   =================================== */
header {
  background-color: var(--color-bg-white);
  border-bottom: 2px solid var(--color-border);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.header-container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 1px;
}

nav ul {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0;
}

nav a {
  font-size: 0.95rem;
  font-weight: 500;
  text-transform: uppercase;
  color: var(--color-text-dark);
  letter-spacing: 0.5px;
  position: relative;
}

nav a:hover,
nav a.active {
  color: var(--color-accent-1);
}

nav a.active::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-accent-1);
}

/* ===================================
   EDUCATIONAL PANEL SYSTEM
   =================================== */
.panel {
  padding: var(--spacing-2xl) 0;
  border-bottom: 1px solid var(--color-border);
}

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

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

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

.panel.accent-bg h1,
.panel.accent-bg h2,
.panel.accent-bg h3 {
  color: var(--color-bg-white);
}

.panel.accent-bg p {
  color: #ECF0F1;
}

.panel-container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

/* Grid System */
.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--spacing-xl);
  align-items: center;
}

.col-6 {
  grid-column: span 6;
}

.col-4 {
  grid-column: span 4;
}

.col-3 {
  grid-column: span 3;
}

.col-12 {
  grid-column: span 12;
}

/* Hero Section */
.hero {
  background-color: var(--color-primary);
  color: var(--color-bg-white);
  padding: var(--spacing-2xl) 0;
  position: relative;
}

.hero h1 {
  color: var(--color-bg-white);
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
}

.hero p {
  color: #ECF0F1;
  font-size: 1.2rem;
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
}

.hero-image {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

/* ===================================
   CONTENT BLOCKS
   =================================== */
.text-block {
  line-height: 1.8;
}

.text-block h2 {
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-accent-2);
  padding-bottom: var(--spacing-md);
}

.text-block strong {
  color: var(--color-accent-1);
  font-weight: 600;
}

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

.image-block {
  position: relative;
  overflow: hidden;
  border-radius: 2px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.image-block img {
  width: 100%;
  height: auto;
  display: block;
  transition: var(--transition-smooth);
}

.image-block:hover img {
  transform: scale(1.02);
}

/* Cards System */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin: var(--spacing-xl) 0;
}

.card {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  padding: var(--spacing-lg);
  transition: var(--transition-smooth);
  border-radius: 2px;
}

.card:hover {
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
  transform: translateY(-4px);
}

.card h3 {
  color: var(--color-primary);
}

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

/* ===================================
   BUTTONS & CTA
   =================================== */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-accent-1);
  color: var(--color-bg-white);
  text-transform: uppercase;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  border: 2px solid var(--color-accent-1);
  cursor: pointer;
  transition: var(--transition-smooth);
  border-radius: 2px;
  text-decoration: none;
}

.btn:hover {
  background-color: transparent;
  color: var(--color-accent-1);
}

.btn-secondary {
  background-color: var(--color-accent-2);
  border-color: var(--color-accent-2);
}

.btn-secondary:hover {
  color: var(--color-accent-2);
}

.btn-text {
  background-color: transparent;
  color: var(--color-accent-1);
  border: none;
  text-transform: none;
  font-size: 1rem;
  padding: 0;
}

.btn-text:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* ===================================
   FOOTER
   =================================== */
footer {
  background-color: var(--color-primary);
  color: var(--color-bg-white);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-2xl);
}

footer h3 {
  color: var(--color-accent-2);
  margin-bottom: var(--spacing-md);
}

footer p, footer a {
  color: #ECF0F1;
  font-size: 0.9rem;
  line-height: 1.8;
}

footer a:hover {
  color: var(--color-accent-2);
  text-decoration: none;
}

.footer-container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
}

.footer-section ul {
  list-style: none;
  margin: 0;
}

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

.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: #BDC3C7;
}

/* ===================================
   FORMS
   =================================== */
form {
  max-width: 600px;
  margin: var(--spacing-xl) 0;
}

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

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--color-text-dark);
}

input[type="text"],
input[type="email"],
input[type="phone"],
textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  font-family: var(--font-body);
  font-size: 1rem;
  transition: var(--transition-smooth);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="phone"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-accent-1);
  box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

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

/* ===================================
   DISCLAIMER & CONTEXT BLOCK
   =================================== */
.disclaimer-block {
  background-color: #FEF5E7;
  border-left: 4px solid var(--color-accent-2);
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  border-radius: 2px;
}

.disclaimer-block h4 {
  color: var(--color-accent-2);
  margin-top: 0;
}

.disclaimer-block p {
  color: var(--color-text-dark);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-sm);
}

.disclaimer-block p:last-child {
  margin-bottom: 0;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 1024px) {
  .col-6 { grid-column: span 12; }
  .col-4 { grid-column: span 6; }
  .col-3 { grid-column: span 4; }
  
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  nav ul {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .col-4 { grid-column: span 12; }
  .col-3 { grid-column: span 12; }
  
  .cards-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .grid {
    gap: var(--spacing-lg);
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .panel-container {
    padding: 0 var(--spacing-md);
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.5rem;
  }
  
  h2 {
    font-size: 1.2rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  nav ul {
    gap: var(--spacing-xs);
  }
  
  nav a {
    font-size: 0.8rem;
  }
}

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

.panel {
  animation: fadeInUp 0.6s ease-out;
}