:root {
  --primary-color: #0066cc;
  --primary-dark: #004d99;
  --primary-light: #3385d6;
  --secondary-color: #00a86b;
  --secondary-dark: #008556;
  --accent-color: #ff6b35;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --text-light: #999999;
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --border-color: #e0e0e0;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}

.header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 24px 0;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.logo-section {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.logo {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: white;
}

.tagline {
  font-size: 13px;
  font-weight: 400;
  opacity: 0.9;
  letter-spacing: 0.5px;
}

.main-nav {
  display: flex;
  gap: 8px;
}

.nav-link {
  padding: 10px 20px;
  color: white;
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  border-radius: 8px;
  transition: var(--transition);
  opacity: 0.85;
}

.nav-link:hover {
  opacity: 1;
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
  background-color: rgba(255, 255, 255, 0.2);
  opacity: 1;
}

.hero {
  background: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
  color: white;
  padding: 64px 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -1px;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 20px;
  font-weight: 400;
  opacity: 0.9;
  margin-bottom: 48px;
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  max-width: 1000px;
  margin: 0 auto;
}

.stat-item {
  text-align: center;
  padding: 24px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: var(--transition);
}

.stat-item:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.15);
}

.stat-number {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 8px;
  color: #ffffff;
}

.stat-label {
  font-size: 14px;
  font-weight: 500;
  opacity: 0.9;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.filters-section {
  background: var(--bg-primary);
  padding: 32px 0;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 76px;
  z-index: 90;
}

.filters {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 16px;
}

.filter-group {
  display: flex;
  flex-direction: column;
}

.search-input,
.filter-select {
  padding: 12px 16px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  transition: var(--transition);
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

.search-input:focus,
.filter-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.filter-select {
  cursor: pointer;
}

.main-content {
  padding: 48px 0 80px;
  min-height: 60vh;
}

.students-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 32px;
  animation: fadeIn 0.6s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.student-card {
  background: var(--bg-primary);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid var(--border-color);
}

.student-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-light);
}

.student-photo-container {
  position: relative;
  width: 100%;
  padding-top: 100%;
  overflow: hidden;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.student-photo {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.student-card:hover .student-photo {
  transform: scale(1.05);
}

.placement-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--secondary-color);
  color: white;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: var(--shadow-md);
}

.student-info {
  padding: 24px;
}

.student-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
  line-height: 1.3;
}

.student-course {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-weight: 500;
}

.placement-details {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.detail-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.detail-icon {
  width: 20px;
  height: 20px;
  min-width: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  font-weight: 600;
  font-size: 14px;
}

.detail-content {
  flex: 1;
}

.detail-label {
  font-size: 12px;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
  margin-bottom: 2px;
}

.detail-value {
  font-size: 15px;
  color: var(--text-primary);
  font-weight: 500;
  line-height: 1.4;
}

.company-name {
  color: var(--primary-color);
  font-weight: 600;
}

.salary-value {
  color: var(--secondary-color);
  font-weight: 700;
  font-size: 18px;
}

.loading-state,
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 24px;
}

.loader {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 24px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-state p,
.empty-state p {
  color: var(--text-secondary);
  font-size: 16px;
}

.footer {
  background: var(--text-primary);
  color: white;
  padding: 32px 0;
  text-align: center;
}

.footer p {
  opacity: 0.8;
  font-size: 14px;
}

@media (max-width: 1024px) {
  .filters {
    grid-template-columns: 1fr 1fr;
  }

  .students-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .hero-title {
    font-size: 36px;
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .header-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .main-nav {
    width: 100%;
    overflow-x: auto;
  }

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

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

  .hero {
    padding: 40px 0;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

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

  .stat-number {
    font-size: 28px;
  }

  .filters-section {
    top: auto;
    position: relative;
  }
}

@media (max-width: 480px) {
  .students-grid {
    grid-template-columns: 1fr;
  }
}