/* Polynox - Institutional Educational Website */
/* Design System: Modular Institutional Composition */

/* ===== IMPORT FONTS ===== */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;600;700&family=Open+Sans:wght@400;500;600;700&display=swap');

/* ===== CSS VARIABLES - COLOR SYSTEM ===== */
:root {
  /* Primary Color */
  --primary: #2C3E50;
  
  /* Secondary - Neutrals */
  --neutral-light: #F8F8F8;
  --neutral-medium: #EEEEEE;
  --neutral-dark: #333333;
  --white: #FFFFFF;
  
  /* Accent Colors */
  --accent-orange: #F39C12;
  --accent-green: #27AE60;
  --accent-silver: #BDC3C7;
  
  /* Spacing System */
  --spacing-xs: 10px;
  --spacing-sm: 20px;
  --spacing-md: 40px;
  --spacing-lg: 80px;
  --spacing-xl: 120px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  
  /* Container Width */
  --container-width: 1200px;
  --container-max-width: 1440px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Open Sans', sans-serif;
  color: var(--primary);
  background-color: var(--white);
  line-height: 1.6;
  font-size: 16px;
  letter-spacing: 0.3px;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

h1 {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-bottom: var(--spacing-lg);
}

h3 {
  font-size: 24px;
  font-weight: 600;
}

h4 {
  font-size: 20px;
  font-weight: 600;
}

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

a {
  color: var(--accent-orange);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

/* ===== CONTAINER & LAYOUT ===== */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-wide {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.full-width {
  width: 100%;
}

/* ===== HEADER & NAVIGATION ===== */
header {
  background-color: var(--primary);
  color: var(--white);
  padding: var(--spacing-sm) 0;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

.logo {
  font-family: 'Montserrat', sans-serif;
  font-size: 24px;
  font-weight: 700;
  color: var(--white);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo img {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
}

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

nav a {
  color: var(--white);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: color 0.3s ease;
  position: relative;
}

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

nav a.active {
  color: var(--accent-orange);
  border-bottom: 2px solid var(--accent-orange);
  padding-bottom: 2px;
}

body {
  padding-top: 70px;
}

/* ===== HERO SECTION ===== */
.hero {
  background-image: linear-gradient(rgba(44, 62, 80, 0.5), rgba(44, 62, 80, 0.5)), url('../images/hero-main.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--white);
  padding: var(--spacing-xl) var(--spacing-md);
  position: relative;
}

.hero-content h1 {
  font-size: 56px;
  color: var(--white);
  margin-bottom: var(--spacing-md);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.3;
}

.hero-content p {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing-lg);
}

/* ===== SECTIONS - GENERAL ===== */
section {
  padding: var(--spacing-xl) 0;
}

section.full-width-section {
  padding-left: 0;
  padding-right: 0;
}

/* Alternating background colors */
section:nth-child(even) {
  background-color: var(--neutral-light);
}

section:nth-child(odd) {
  background-color: var(--white);
}

/* ===== GRID LAYOUT ===== */
.grid {
  display: grid;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.grid-2 {
  grid-template-columns: 1fr 1fr;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-col-60-40 {
  grid-template-columns: 60% 40%;
}

.grid-col-40-60 {
  grid-template-columns: 40% 60%;
}

/* ===== CARDS ===== */
.card {
  background-color: var(--white);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.card img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

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

.card p {
  font-size: 15px;
  color: #666;
  margin-bottom: var(--spacing-md);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
}

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

.btn-primary:hover {
  background-color: #E67E22;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(243, 156, 18, 0.3);
}

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

.btn-secondary:hover {
  background-color: #1a2332;
}

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

.footer-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
}

.footer-section h4 {
  color: var(--accent-orange);
  margin-bottom: var(--spacing-md);
  font-size: 16px;
}

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

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

.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 14px;
}

.footer-section a:hover {
  color: var(--accent-orange);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
}

/* ===== CONTENT SECTIONS ===== */
.section-text {
  max-width: 800px;
}

.section-image {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* ===== QUOTE BLOCK ===== */
.quote-block {
  background-color: var(--accent-silver);
  padding: var(--spacing-lg);
  border-left: 4px solid var(--accent-orange);
  margin: var(--spacing-lg) 0;
  border-radius: var(--radius-md);
}

.quote-block p {
  font-style: italic;
  font-size: 18px;
  color: var(--primary);
  margin: 0;
}

/* ===== STATISTICS BLOCK ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
  margin: var(--spacing-xl) 0;
}

.stat {
  text-align: center;
  padding: var(--spacing-md);
  background-color: var(--neutral-light);
  border-radius: var(--radius-md);
}

.stat-number {
  font-size: 36px;
  font-weight: 700;
  color: var(--accent-green);
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  font-size: 14px;
  color: var(--primary);
  font-weight: 600;
}

/* ===== TABLE ===== */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-lg) 0;
  background-color: var(--white);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-md);
  overflow: hidden;
}

thead {
  background-color: var(--primary);
  color: var(--white);
}

th, td {
  padding: var(--spacing-sm);
  text-align: left;
  border-bottom: 1px solid var(--neutral-medium);
}

tr:hover {
  background-color: var(--neutral-light);
}

/* ===== GLOSSARY ===== */
.glossary-item {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--neutral-medium);
}

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

.glossary-term {
  font-weight: 700;
  color: var(--accent-orange);
  font-size: 16px;
  margin-bottom: var(--spacing-sm);
}

.glossary-definition {
  color: #666;
  line-height: 1.8;
}

/* ===== FORM ELEMENTS ===== */
form {
  max-width: 600px;
  margin: var(--spacing-lg) auto;
}

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

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

input[type="text"],
input[type="email"],
input[type="phone"],
textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--neutral-medium);
  border-radius: var(--radius-md);
  font-family: 'Open Sans', sans-serif;
  font-size: 14px;
  transition: border-color 0.3s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="phone"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent-orange);
  box-shadow: 0 0 8px rgba(243, 156, 18, 0.2);
}

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

/* ===== BREADCRUMB ===== */
.breadcrumb {
  font-size: 13px;
  margin-bottom: var(--spacing-md);
  color: #999;
}

.breadcrumb a {
  color: var(--accent-orange);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  h1 {
    font-size: 36px;
  }
  
  h2 {
    font-size: 28px;
  }
  
  .header-content {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  nav ul {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
  
  .grid-2, .grid-col-60-40, .grid-col-40-60 {
    grid-template-columns: 1fr;
  }
  
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }
  
  .hero {
    min-height: 400px;
  }
  
  .hero-content h1 {
    font-size: 36px;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  section {
    padding: var(--spacing-lg) 0;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }
  
  h1 {
    font-size: 28px;
  }
  
  h2 {
    font-size: 22px;
  }
  
  h3 {
    font-size: 18px;
  }
  
  nav ul {
    gap: var(--spacing-xs);
  }
  
  nav a {
    font-size: 12px;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .btn {
    padding: 10px 20px;
    font-size: 12px;
  }
}