:root {
  --primary-color: #3b82f6;
  --primary-dark: #1e40af;
  --secondary-color: #10b981;
  --accent-color: #f59e0b;
  --danger-color: #ef4444;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --border-color: #e5e7eb;
  --border-light: #f3f4f6;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --transition: all 0.2s ease-in-out;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header Styles */
.header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
}

.header__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo::before {
  content: '🎓';
  font-size: 1.25rem;
}

.nav {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav__link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
}

.nav__link:hover {
  color: var(--primary-color);
  background-color: var(--bg-secondary);
}

.nav__actions {
  display: flex;
  gap: 1rem;
  align-items: center;
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  font-size: 0.875rem;
  line-height: 1;
}

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

.btn--primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn--secondary:hover {
  background: var(--bg-tertiary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

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

.btn--success:hover {
  background: #059669;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.hero__title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero__subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Quick Links */
.quick-links {
  padding: 3rem 0;
  background: var(--bg-secondary);
}

.quick-links__title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--text-primary);
}

.quick-links__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.quick-link-card {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: var(--transition);
  border: 1px solid var(--border-light);
}

.quick-link-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.quick-link-card__icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.quick-link-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.quick-link-card__description {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* Forms */
.form-container {
  max-width: 500px;
  margin: 2rem auto;
  padding: 2rem;
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
}

.form-title {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* Dashboard */
.dashboard {
  display: grid;
  grid-template-columns: 250px 1fr;
  min-height: calc(100vh - 80px);
}

.sidebar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: 2rem 1rem;
}

.sidebar__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.sidebar__nav {
  list-style: none;
}

.sidebar__nav-item {
  margin-bottom: 0.5rem;
}

.sidebar__nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.sidebar__nav-link:hover,
.sidebar__nav-link--active {
  background: var(--primary-color);
  color: white;
}

.main-content {
  padding: 2rem;
  background: var(--bg-primary);
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--text-primary);
}

/* Cards */
.card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.card__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

/* Contact */
.contact-info {
  background: var(--bg-secondary);
  padding: 3rem 0;
  text-align: center;
}

.contact-info__title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.contact-info__methods {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.contact-method {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: var(--text-primary);
  transition: var(--transition);
}

.contact-method:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Utilities */
.hidden {
  display: none !important;
}

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

.mt-4 {
  margin-top: 2rem;
}

.mb-4 {
  margin-bottom: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header__content {
    flex-direction: column;
    gap: 1rem;
  }

  .nav {
    flex-direction: column;
    gap: 1rem;
  }

  .nav__actions {
    width: 100%;
    justify-content: center;
  }

  .hero__title {
    font-size: 2rem;
  }

  .hero__subtitle {
    font-size: 1rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

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

  .sidebar {
    position: fixed;
    top: 80px;
    left: -250px;
    width: 250px;
    height: calc(100vh - 80px);
    z-index: 90;
    transition: var(--transition);
  }

  .sidebar.open {
    left: 0;
  }

  .quick-links__grid {
    grid-template-columns: 1fr;
  }

  .contact-info__methods {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 0.5rem;
  }

  .form-container {
    margin: 1rem;
    padding: 1.5rem;
  }

  .main-content {
    padding: 1rem;
  }

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