/* CSS Variables - Colors from Reunion Logo */
:root {
  /* Primary Colors from Logo */
  --primary-blue: #1e3a8a;
  --dark-blue: #1e40af;
  --light-blue: #3b82f6;
  --accent-red: #dc2626;
  --bright-red: #ef4444;
  --golden-yellow: #fbbf24;
  --bright-yellow: #fde047;

  /* Neutral Colors */
  --white: #ffffff;
  --light-gray: #f8fafc;
  --medium-gray: #e2e8f0;
  --dark-gray: #64748b;
  --text-dark: #1e293b;
  --text-medium: #475569;
  --text-light: #94a3b8;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;

  /* Shadows */
  --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);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--light-gray);
}

/* Header Styles */
.header {
  background: var(--white);
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar {
  padding: 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo-img {
  width: 3.75rem;
  height: 3.75rem;
  border-radius: 50%;
  object-fit: cover;
}

.logo-text {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--primary-blue);
  display: none;
}

.nav-menu {
  display: none;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-link {
  text-decoration: none;
  color: var(--text-medium);
  font-weight: 500;
  font-size: 0.9rem;
  transition: color 0.3s ease;
  position: relative;
}

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

.nav-link.active {
  color: var(--primary-blue);
  font-weight: 600;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-blue);
}

/* Dropdown Styles */
.dropdown {
  position: relative;
}

.dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-sm);
  min-width: 12rem;
  display: none;
  z-index: 1000;
}

.dropdown-item {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  color: var(--text-medium);
  border-radius: var(--radius-md);
  transition: background-color 0.3s ease;
}

.dropdown-item:hover {
  background-color: var(--light-gray);
  color: var(--primary-blue);
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.hamburger-line {
  width: 1.5rem;
  height: 2px;
  background: var(--text-medium);
  transition: all 0.3s ease;
}

.mobile-menu-btn.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(0.375rem, 0.375rem);
}

.mobile-menu-btn.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(0.375rem, -0.375rem);
}

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 50%, var(--primary-blue) 100%);
  padding: var(--spacing-2xl) 0;
  color: var(--white);
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
  align-items: center;
}

.hero-text-block {
  flex: 1;
  text-align: center;
}

.promo-banners {
  background: rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.yellow-banner {
  background: var(--golden-yellow);
  color: var(--primary-blue);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-lg);
  font-size: 1.125rem;
  font-weight: 800;
  box-shadow: var(--shadow-md);
}

.red-banner {
  background: var(--accent-red);
  color: var(--white);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-size: 2rem;
  font-weight: 900;
  box-shadow: var(--shadow-lg);
}

.online-offline-text {
  font-size: 1.25rem;
  font-weight: 700;
  opacity: 0.9;
}

.platform-text {
  font-size: 0.875rem;
  opacity: 0.7;
}

.video-player-wrapper {
  flex: 1;
  width: 100%;
  max-width: 700px;
}

.video-player-container {
  background: var(--text-dark);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  aspect-ratio: 16 / 9;
}

.video-player-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.no-video-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-light);
}

.no-video-placeholder i {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

/* Faculty and Seminar Section */
.faculty-seminar-section {
  padding: var(--spacing-3xl) 0;
  background: var(--medium-gray);
}

.section-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.faculty-seminar-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
}

.section-card {
  background: var(--white);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-2xl);
}

.section-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--primary-blue);
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.faculty-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.faculty-card {
  background: var(--light-gray);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.faculty-card:hover {
  transform: translateY(-0.25rem);
  box-shadow: var(--shadow-lg);
}

.faculty-avatar {
  width: 4rem;
  height: 4rem;
  background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
  color: var(--white);
  font-size: 1.5rem;
  font-weight: 700;
}

.faculty-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary-blue);
  margin-bottom: var(--spacing-xs);
}

.faculty-role {
  font-size: 0.875rem;
  color: var(--text-medium);
  margin-bottom: var(--spacing-xs);
}

.faculty-designation {
  font-size: 0.75rem;
  color: var(--text-light);
  font-weight: 500;
}

/* Seminar Section */
.seminar-section {
  display: flex;
  align-items: stretch;
}

.seminar-card {
  background: linear-gradient(135deg, var(--primary-blue), var(--dark-blue));
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-2xl);
  color: var(--white);
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 100%;
}

.seminar-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--golden-yellow);
  margin-bottom: var(--spacing-xl);
}

.seminar-details {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.seminar-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 700;
}

.qr-code-section {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
}

.qr-code-placeholder {
  width: 8rem;
  height: 8rem;
  background: var(--medium-gray);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
}

.qr-code-placeholder i {
  font-size: 3rem;
  color: var(--text-light);
}

.qr-text {
  color: var(--primary-blue);
  font-weight: 600;
  font-size: 0.875rem;
}

/* Current Affairs Section */
.current-affairs-section {
  padding: var(--spacing-3xl) 0;
  background: var(--white);
}

.current-affairs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.current-affairs-card {
  background: var(--light-gray);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.current-affairs-card:hover {
  transform: translateY(-0.5rem);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  width: 3rem;
  height: 3rem;
  background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
  color: var(--white);
  font-size: 1.25rem;
}

.current-affairs-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--primary-blue);
  margin-bottom: var(--spacing-sm);
}

.current-affairs-card p {
  font-size: 0.875rem;
  color: var(--text-medium);
  line-height: 1.6;
}

/* Latest Videos Section */
.latest-videos-section {
  padding: var(--spacing-3xl) 0;
  background: var(--medium-gray);
}

.no-videos-message {
  text-align: center;
  color: var(--text-medium);
  padding: var(--spacing-2xl);
}

.no-videos-message i {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: var(--text-light);
}

.videos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.video-card {
  background: var(--white);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.video-card:hover {
  transform: translateY(-0.5rem);
  box-shadow: var(--shadow-xl);
}

.video-thumbnail {
  aspect-ratio: 16 / 9;
  background: var(--text-dark);
}

.video-thumbnail iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.video-info {
  padding: var(--spacing-lg);
}

.video-info h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--primary-blue);
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.video-info p {
  font-size: 0.875rem;
  color: var(--text-medium);
  line-height: 1.6;
}

/* Footer */
.footer {
  background: var(--primary-blue);
  color: var(--white);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--golden-yellow);
  margin-bottom: var(--spacing-md);
}

.footer-content {
  color: var(--text-light);
}

.contact-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.footer-links {
  list-style: none;
}

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

.footer-links a {
  color: var(--text-light);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--golden-yellow);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
}

.social-link {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: transform 0.3s ease, background-color 0.3s ease;
}

.social-link.facebook {
  background: #1877f2;
}

.social-link.instagram {
  background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
}

.social-link.youtube {
  background: var(--accent-red);
}

.social-link:hover {
  transform: translateY(-0.125rem);
}

.social-link i {
  color: var(--white);
  font-size: 1rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-xl);
  text-align: center;
  color: var(--text-light);
}

/* Responsive Design */
@media (min-width: 640px) {
  .logo-text {
    display: block;
  }

  .nav-container {
    height: 5rem;
  }

  .hero-content {
    flex-direction: row;
    text-align: left;
  }

  .promo-banners {
    align-items: flex-start;
  }
}

@media (min-width: 1024px) {
  .nav-menu {
    display: flex;
  }

  .mobile-menu-btn {
    display: none;
  }

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

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

/* Mobile Menu Styles */
@media (max-width: 1023px) {
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-lg);
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-md);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
  }

  .nav-menu.active {
    display: flex;
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

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

  .dropdown-menu {
    position: static;
    box-shadow: none;
    background: var(--light-gray);
    margin-top: var(--spacing-sm);
    display: block;
  }
}

/* Small Mobile Adjustments */
@media (max-width: 480px) {
  .hero-section {
    padding: var(--spacing-xl) 0;
  }

  .yellow-banner {
    font-size: 1rem;
    padding: var(--spacing-xs) var(--spacing-md);
  }

  .red-banner {
    font-size: 1.5rem;
    padding: var(--spacing-sm) var(--spacing-lg);
  }

  .online-offline-text {
    font-size: 1rem;
  }

  .platform-text {
    font-size: 0.75rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

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

  .faculty-grid,
  .current-affairs-grid,
  .videos-grid {
    grid-template-columns: 1fr;
  }

  .section-card,
  .seminar-card {
    padding: var(--spacing-lg);
  }
}