:root {
  --navy-dark: #0f2035;
  --navy: #1a3050;
  --blue: #2563eb;
  --blue-hover: #1d4ed8;
  --blue-light: #dbeafe;
  --blue-pale: #eff6ff;
  --sky: #60a5fa;
  --bg: #f0f4f8;
  --text-dark: #0f2035;
  --text: #334155;
  --text-muted: #64748b;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(15, 32, 53, 0.06);
  --shadow: 0 2px 8px rgba(15, 32, 53, 0.08);
  --shadow-lg: 0 8px 24px rgba(15, 32, 53, 0.12);
  --shadow-blue: 0 4px 14px rgba(37, 99, 235, 0.25);
  --transition: 0.2s ease;
}

html {
  font-size: 14px;
  position: relative;
  min-height: 100%;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
  background-color: var(--bg);
  color: var(--text-dark);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
}

a {
  color: var(--blue);
  transition: color var(--transition);
}

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

.page-wrapper {
  flex: 1;
}

.navbar-custom {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 100%);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  padding: 0.75rem 0;
}

.navbar-custom .navbar-brand {
  color: #ffffff;
  font-weight: 700;
  font-size: 1.4rem;
  transition: color var(--transition);
}

.navbar-custom .navbar-brand:hover {
  color: var(--sky);
}

.navbar-custom .nav-link {
  color: rgba(255, 255, 255, 0.8);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all var(--transition);
  margin: 0 2px;
}

.navbar-custom .nav-link:hover {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.1);
}

.navbar-custom .nav-link.active {
  color: #ffffff;
  background-color: rgba(59, 130, 246, 0.35);
}

.navbar-custom .navbar-toggler {
  border-color: rgba(255, 255, 255, 0.3);
}

.navbar-custom .navbar-toggler-icon {
  filter: invert(1);
}

.navbar-custom .dropdown-menu {
  border: none;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 0.5rem;
  margin-top: 0.5rem;
}

.navbar-custom .dropdown-item {
  border-radius: 8px;
  padding: 0.5rem 1rem;
  font-weight: 500;
  transition: background-color var(--transition);
}

.navbar-custom .dropdown-item:hover {
  background-color: var(--blue-pale);
  color: var(--blue);
}

.hero-section {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 50%, var(--blue) 100%);
  color: white;
  padding: 70px 20px;
  border-radius: var(--radius);
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(96, 165, 250, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-title-row {
  margin-left: -10%;
  gap: 0 !important;
}

.hero-title-row h1 {
  margin-left: -60px;
}

.hero-section h1 {
  font-size: 2.6rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.hero-section p {
  font-size: 1.15rem;
  opacity: 0.9;
  margin-bottom: 1.5rem;
}

.card {
  border: none;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  overflow: hidden;
  background: #ffffff;
}

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

.card-img-top {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.card:hover .card-img-top {
  transform: scale(1.03);
}

.card-body {
  padding: 1.5rem;
}

.card-title a {
  color: var(--text-dark);
  text-decoration: none;
  transition: color var(--transition);
}

.card-title a:hover {
  color: var(--blue);
}

.card-text {
  color: var(--text);
  line-height: 1.7;
}

.post-thumbnail {
  width: 120px;
  height: 80px;
  object-fit: cover;
  border-radius: 8px;
  transition: opacity var(--transition);
}

.post-thumbnail:hover {
  opacity: 0.85;
}

.post-image img {
  box-shadow: var(--shadow);
}

.post-card-thumbnail {
  width: 240px;
  height: 170px;
  border-radius: 10px;
  overflow: hidden;
  background-color: var(--blue-pale);
  border: 1px solid rgba(37, 99, 235, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
}

.post-card-thumbnail img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
  border-radius: 6px;
  transition: transform 0.3s ease;
}

.post-card:hover .post-card-thumbnail img {
  transform: scale(1.06);
}

.btn-primary {
  background-color: var(--blue);
  border-color: var(--blue);
  border-radius: 8px;
  padding: 0.5rem 1.25rem;
  font-weight: 500;
  transition: all var(--transition);
}

.btn-primary:hover {
  background-color: var(--blue-hover);
  border-color: var(--blue-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-blue);
}

.btn-outline-primary {
  color: var(--blue);
  border-color: var(--blue);
  border-radius: 8px;
  font-weight: 500;
  transition: all var(--transition);
}

.btn-outline-primary:hover {
  background-color: var(--blue);
  border-color: var(--blue);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: #475569;
  border-color: #475569;
  border-radius: 8px;
  transition: all var(--transition);
}

.btn-secondary:hover {
  background-color: #374151;
  border-color: #374151;
}

.btn-warning {
  border-radius: 8px;
  transition: all var(--transition);
}

.btn-warning:hover {
  transform: translateY(-1px);
}

.btn-danger {
  border-radius: 8px;
  transition: all var(--transition);
}

.btn-danger:hover {
  transform: translateY(-1px);
}

.btn-outline-secondary {
  border-radius: 8px;
  transition: all var(--transition);
}

.btn-outline-danger {
  border-radius: 8px;
}

.btn-light {
  font-weight: 600;
  border-radius: 8px;
  transition: all var(--transition);
}

.btn-light:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(255, 255, 255, 0.3);
}

.badge-category {
  background-color: var(--blue-light);
  color: var(--blue-hover);
  border-radius: 20px;
  padding: 0.35em 0.85em;
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.form-control {
  border-radius: 8px;
  border: 2px solid #e2e8f0;
  padding: 0.6rem 1rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  background-color: #ffffff;
}

.form-control:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
  background-color: #ffffff;
}

.form-label {
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
}

.form-card {
  background: #ffffff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  border: 1px solid rgba(226, 232, 240, 0.6);
}

.footer-custom {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 100%);
  color: rgba(255, 255, 255, 0.7);
  padding: 2rem 0;
  margin-top: 3rem;
}

.footer-custom a {
  color: var(--sky);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-custom a:hover {
  color: #ffffff;
}

.alert {
  border-radius: 10px;
  border: none;
  font-weight: 500;
}

.alert-success {
  background-color: #d1fae5;
  color: #065f46;
}

.alert-danger {
  background-color: #fee2e2;
  color: #991b1b;
}

.breadcrumb {
  background-color: var(--blue-pale);
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  font-size: 0.9rem;
}

.breadcrumb-item a {
  color: var(--blue);
  text-decoration: none;
}

.breadcrumb-item a:hover {
  color: var(--blue-hover);
}

.post-content {
  font-size: 1.1rem;
  line-height: 1.85;
  color: var(--text);
}

.section-title {
  color: var(--navy-dark);
  font-weight: 700;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--blue);
  display: inline-block;
  letter-spacing: -0.01em;
}

.reading-time {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.word-counter {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: right;
  margin-top: 0.25rem;
}

.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.category-filter .btn {
  border-radius: 20px;
  padding: 0.3rem 1rem;
  font-size: 0.85rem;
  transition: all var(--transition);
}

.category-filter .btn-active {
  background-color: var(--blue);
  color: white;
  border-color: var(--blue);
  box-shadow: var(--shadow-blue);
}

.btn:focus,
.btn:active:focus,
.btn-link.nav-link:focus,
.form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem var(--blue);
}

.modal-content {
  border-radius: var(--radius);
  border: none;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  background-color: var(--blue-pale);
  border-radius: var(--radius) var(--radius) 0 0;
  border-bottom: 1px solid #e2e8f0;
}

.modal-footer {
  border-top: 1px solid #e2e8f0;
}

.post-meta-item {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.shellty-logo {
  transition: transform 0.3s ease;
}

.shellty-logo:hover {
  transform: scale(1.05);
}

.logo-glow-highlight path,
.logo-glow-highlight-2 path,
.logo-glow-highlight-3 path,
.logo-glow-highlight-4 path,
.logo-glow-small path,
.logo-glow-small-2 path {
  transition: fill 0.3s ease, filter 0.3s ease;
}

.shellty-logo:hover .logo-glow-highlight path,
.shellty-logo:hover .logo-glow-highlight-2 path,
.shellty-logo:hover .logo-glow-highlight-3 path,
.shellty-logo:hover .logo-glow-highlight-4 path,
.shellty-logo:hover .logo-glow-small path,
.shellty-logo:hover .logo-glow-small-2 path {
  fill: #ffffff;
  filter: drop-shadow(0 0 8px #00d4ff) drop-shadow(0 0 15px #00d4ff);
}

@keyframes glow-pulse {
  0%, 100% {
    filter: drop-shadow(0 0 5px #00d4ff);
  }
  50% {
    filter: drop-shadow(0 0 15px #00d4ff) drop-shadow(0 0 25px #00d4ff);
  }
}

.shellty-logo:hover .logo-glow-highlight path {
  animation: glow-pulse 1.5s ease-in-out infinite;
}

@media (max-width: 576px) {
  .post-card .card-body {
    flex-direction: column !important;
  }

  .post-card-thumbnail {
    width: 100%;
    height: 180px;
    border-radius: 10px;
  }
}

@media (min-width: 577px) and (max-width: 767.98px) {
  .post-card-thumbnail {
    width: 180px;
    height: 130px;
  }
}

@media (max-width: 767.98px) {
  .hero-section {
    padding: 40px 16px;
  }

  .hero-section h1 {
    font-size: 1.8rem;
  }

  .hero-title-row {
    margin-left: 0;
    flex-direction: column;
  }

  .hero-title-row h1 {
    margin-left: 0;
  }

  .post-thumbnail {
    width: 80px;
    height: 56px;
  }

  .card-img-top {
    height: 160px;
  }
}

.highlight-ty {
  color: #00E5FF;
}