/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #64748b;
  --text-color: #1f2937;
  --text-light: #6b7280;
  --bg-color: #ffffff;
  --bg-light: #f9fafb;
  --bg-dark: #f3f4f6;
  --border-color: #e5e7eb;
  --card-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --card-shadow-hover: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --max-width: 1200px;
  --spacing: 1rem;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
  width: 100%;
}

/* Header */
.header {
  background-color: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--card-shadow);
}

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

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

.logo-link:hover {
  color: var(--primary-color);
}

.site-logo {
  height: 40px;
  width: auto;
  display: block;
  object-fit: contain;
}

.logo-text {
  display: inline-block;
}

/* Navigation */
.nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-link {
  color: var(--text-light);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 0;
  transition: color 0.2s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--text-color);
}

.nav-link.active {
  color: var(--primary-color);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--primary-color);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-color);
  padding: 0.5rem;
  line-height: 1;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 2rem 0;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 3rem 0;
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.hero .tagline {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-light);
  max-width: 700px;
  margin: 0 auto 2rem;
}

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

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-weight: 500;
  text-align: center;
  border-radius: 0.5rem;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  text-decoration: none;
  font-size: 1rem;
}

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

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

.btn-secondary {
  background-color: var(--bg-dark);
  color: var(--text-color);
}

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

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

/* Stats Section */
.stats-section {
  background-color: var(--bg-light);
  padding: 3rem 0;
  margin: 3rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.stat-card {
  text-align: center;
  padding: 1.5rem;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 1rem;
  color: var(--text-light);
}

/* Features Section */
.features-section {
  margin: 3rem 0;
}

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

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature-card {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 2rem;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: all 0.2s ease;
}

.feature-card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-color);
}

.feature-card p {
  color: var(--text-light);
}

/* CTA Section */
.cta-section {
  background-color: var(--primary-color);
  color: white;
  padding: 3rem 2rem;
  border-radius: 0.5rem;
  text-align: center;
  margin: 3rem 0;
}

.cta-section h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.cta-section p {
  font-size: 1.125rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

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

.cta-section .btn:hover {
  background-color: var(--bg-light);
}

/* Page Titles */
.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-color);
}

.page-subtitle {
  font-size: 1.125rem;
  color: var(--text-light);
  margin-bottom: 2rem;
}

/* Filter Bar */
.filter-bar {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background-color: var(--bg-light);
  border-radius: 0.5rem;
  flex-wrap: wrap;
  align-items: end;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
  min-width: 150px;
}

.filter-group label {
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--text-color);
}

.filter-select,
.filter-input,
.search-input {
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  font-size: 1rem;
  background-color: var(--bg-color);
  color: var(--text-color);
}

.search-input-large {
  padding: 1rem;
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  font-size: 1.125rem;
  flex: 1;
  min-width: 300px;
}

.search-input-large:focus {
  outline: none;
  border-color: var(--primary-color);
}

/* Alumni Grid */
.alumni-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.alumni-card {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  transition: all 0.2s ease;
  text-decoration: none;
  color: inherit;
  display: block;
}

.alumni-card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-2px);
  border-color: var(--primary-color);
}

.alumni-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2rem;
  font-weight: 700;
  margin: 0 auto 1rem;
}

.alumni-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-color);
  text-align: center;
}

.alumni-info {
  text-align: center;
  color: var(--text-light);
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

.alumni-location {
  text-align: center;
  color: var(--text-light);
  font-size: 0.875rem;
  margin-top: 0.5rem;
}

/* Search Container */
.search-container {
  margin-bottom: 2rem;
}

.search-box {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.advanced-search {
  background-color: var(--bg-light);
  padding: 1.5rem;
  border-radius: 0.5rem;
  margin-bottom: 2rem;
}

.advanced-search h3 {
  margin-bottom: 1rem;
  color: var(--text-color);
}

.search-filters {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.filter-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.filter-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.filter-item label {
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--text-color);
}

.filter-input {
  width: 100%;
}

.filter-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.search-results {
  margin-top: 2rem;
}

.results-count {
  margin-bottom: 1rem;
  color: var(--text-light);
  font-weight: 500;
}

.no-results {
  text-align: center;
  padding: 3rem;
  color: var(--text-light);
}

/* Registration Form */
.form-container {
  max-width: 800px;
  margin: 0 auto;
}

.registration-form {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 2rem;
  box-shadow: var(--card-shadow);
}

.form-section {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.form-section:last-of-type {
  border-bottom: none;
}

.form-section h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-color);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

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

.form-row .form-group {
  margin-bottom: 0;
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-color);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  font-size: 1rem;
  font-family: inherit;
  background-color: var(--bg-color);
  color: var(--text-color);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
  resize: vertical;
}

.form-group input[type="checkbox"] {
  width: auto;
  margin-right: 0.5rem;
}

.form-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
}

/* Auth Pages (Signup/Login) */
.auth-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60vh;
  padding: 2rem 0;
}

.auth-card {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 2.5rem;
  box-shadow: var(--card-shadow);
  width: 100%;
  max-width: 500px;
}

.auth-card .page-title {
  text-align: center;
  margin-bottom: 0.5rem;
}

.auth-card .page-subtitle {
  text-align: center;
  margin-bottom: 2rem;
}

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

.auth-form .form-group {
  margin-bottom: 1.25rem;
}

.auth-form .form-group:last-of-type {
  margin-bottom: 1.5rem;
}

.form-hint {
  display: block;
  font-size: 0.875rem;
  color: var(--text-light);
  margin-top: 0.25rem;
}

.btn-block {
  width: 100%;
  display: block;
}

.auth-divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: 1.5rem 0;
  color: var(--text-light);
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-color);
}

.auth-divider span {
  padding: 0 1rem;
  font-size: 0.875rem;
}

.auth-social {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.social-btn span {
  font-size: 1.25rem;
}

.auth-footer {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.auth-footer p {
  color: var(--text-light);
  margin: 0;
}

.auth-footer .link {
  color: var(--primary-color);
  font-weight: 500;
}

.form-row-inline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.form-row-inline label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0;
}

.form-row-inline input[type="checkbox"] {
  width: auto;
  margin: 0;
}

/* Content Sections */
.content-section {
  margin-bottom: 3rem;
}

.content-section h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.content-section p {
  color: var(--text-light);
  margin-bottom: 1rem;
  line-height: 1.8;
}

.feature-list {
  list-style: none;
  padding-left: 0;
}

.feature-list li {
  padding: 0.75rem 0;
  color: var(--text-light);
  border-bottom: 1px solid var(--border-color);
}

.feature-list li:last-child {
  border-bottom: none;
}

.contact-info {
  background-color: var(--bg-light);
  padding: 1.5rem;
  border-radius: 0.5rem;
  margin-top: 1rem;
}

.contact-info p {
  margin-bottom: 0.5rem;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

/* Footer */
.footer {
  background-color: var(--bg-light);
  border-top: 1px solid var(--border-color);
  margin-top: 4rem;
  padding: 3rem 0 1.5rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-color);
}

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

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: var(--text-light);
  text-decoration: none;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-light);
  font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-color);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav.active {
    max-height: 500px;
  }

  .nav-link {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
  }

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

  .nav-link.active::after {
    display: none;
  }

  .nav-link.active {
    font-weight: 600;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero .tagline {
    font-size: 1.25rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .page-title {
    font-size: 2rem;
  }

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

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

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .filter-bar {
    flex-direction: column;
  }

  .filter-group {
    width: 100%;
  }

  .search-box {
    flex-direction: column;
  }

  .search-input-large {
    width: 100%;
  }

  .site-logo {
    height: 32px;
  }

  .logo-text {
    font-size: 1.25rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .auth-card {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 2rem 0;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .page-title {
    font-size: 1.75rem;
  }

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

  .site-logo {
    height: 28px;
  }

  .logo-text {
    font-size: 1.125rem;
  }
}