/* ===== COMPONENTS — TechPulse Blog ===== */

/* --- Header / Navbar --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(10, 15, 30, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  z-index: 1000;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}
[data-theme="light"] .header {
  background: rgba(248, 250, 252, 0.9);
}
.header.scrolled {
  box-shadow: var(--shadow-md);
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.logo {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-links {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}
.nav-links a {
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: var(--bg-glass);
}
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-md);
  transition: all var(--transition-fast);
}
.theme-toggle:hover {
  border-color: var(--border-hover);
  color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
}

/* Mobile Menu */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}
.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}
@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-glass);
    padding: var(--space-lg);
    gap: var(--space-sm);
  }
  .nav-links.open { display: flex; }
}

/* --- Hero Section --- */
.hero {
  padding: calc(var(--header-height) + var(--space-4xl)) 0 var(--space-4xl);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.12), transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.08), transparent 70%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 1;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-full);
  color: var(--accent-primary-hover);
  font-size: var(--fs-sm);
  font-weight: 500;
  margin-bottom: var(--space-xl);
  animation: fadeInUp 0.6s ease;
}
.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse-glow 2s infinite;
}
.hero h1 {
  font-size: var(--fs-5xl);
  font-weight: 800;
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.6s ease 0.1s both;
}
.hero h1 .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  font-size: var(--fs-lg);
  max-width: 600px;
  margin-bottom: var(--space-2xl);
  animation: fadeInUp 0.6s ease 0.2s both;
}
@media (max-width: 768px) {
  .hero h1 { font-size: var(--fs-3xl); }
  .hero p { font-size: var(--fs-base); }
}

/* --- Article Card --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
}
.card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card-hover);
}
.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 1px solid var(--border-glass);
}
.card-body {
  padding: var(--space-lg);
}
.card-category {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-primary-hover);
  font-size: var(--fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
}
.card-category.cat-ai { background: rgba(99, 102, 241, 0.1); color: #818cf8; }
.card-category.cat-software { background: rgba(6, 182, 212, 0.1); color: #22d3ee; }
.card-category.cat-productivity { background: rgba(34, 197, 94, 0.1); color: #4ade80; }
.card-category.cat-howto { background: rgba(245, 158, 11, 0.1); color: #fbbf24; }
.card-category.cat-compare { background: rgba(236, 72, 153, 0.1); color: #f472b6; }
.card-title {
  font-size: var(--fs-lg);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-excerpt {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-md);
}
.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-xs);
  color: var(--text-muted);
}
.card-meta .read-time {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* --- Featured Card (Large) --- */
.card-featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  min-height: 360px;
}
.card-featured .card-image {
  height: 100%;
  border-bottom: none;
  border-right: 1px solid var(--border-glass);
}
.card-featured .card-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-2xl);
}
.card-featured .card-title {
  font-size: var(--fs-2xl);
  -webkit-line-clamp: 3;
}
.card-featured .card-excerpt {
  -webkit-line-clamp: 4;
  font-size: var(--fs-base);
}
@media (max-width: 768px) {
  .card-featured { grid-template-columns: 1fr; }
  .card-featured .card-image {
    height: 220px;
    border-right: none;
    border-bottom: 1px solid var(--border-glass);
  }
}

/* --- Category Pills --- */
.category-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}
.pill {
  padding: var(--space-sm) var(--space-lg);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-glass);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.pill:hover, .pill.active {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
}

/* --- Section Header --- */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2xl);
}
.section-header h2 {
  font-size: var(--fs-2xl);
}
.section-header .view-all {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}
.section-header .view-all:hover { gap: var(--space-sm); }

/* --- Newsletter CTA --- */
.newsletter {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.newsletter::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
}
.newsletter h3 {
  font-size: var(--fs-2xl);
  margin-bottom: var(--space-sm);
}
.newsletter p {
  margin-bottom: var(--space-xl);
  max-width: 500px;
  margin-inline: auto;
}
.newsletter-form {
  display: flex;
  gap: var(--space-sm);
  max-width: 460px;
  margin: 0 auto;
}
.newsletter-form input {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-primary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  outline: none;
  transition: border-color var(--transition-fast);
}
.newsletter-form input:focus {
  border-color: var(--accent-primary);
}
.newsletter-form input::placeholder {
  color: var(--text-muted);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 2px 12px var(--accent-glow);
}
.btn-primary:hover {
  background: var(--accent-gradient-hover);
  box-shadow: 0 4px 20px var(--accent-glow);
  transform: translateY(-1px);
  color: #fff;
}
.btn-secondary {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-primary);
}
.btn-secondary:hover {
  border-color: var(--border-hover);
  background: rgba(99, 102, 241, 0.1);
}

/* --- Footer --- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-glass);
  padding: var(--space-4xl) 0 var(--space-xl);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}
.footer-brand .logo { margin-bottom: var(--space-md); display: inline-block; }
.footer-brand p { font-size: var(--fs-sm); max-width: 300px; }
.footer-col h4 {
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}
.footer-col a {
  display: block;
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom {
  border-top: 1px solid var(--border-glass);
  padding-top: var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-xs);
  color: var(--text-muted);
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* --- Sidebar --- */
.layout-with-sidebar {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--space-2xl);
}
.sidebar { position: sticky; top: calc(var(--header-height) + var(--space-xl)); height: fit-content; }
.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-xl);
}
.sidebar-widget h4 {
  font-size: var(--fs-base);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border-glass);
}
.popular-item {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border-glass);
}
.popular-item:last-child { border-bottom: none; }
.popular-item .num {
  font-family: var(--font-heading);
  font-size: var(--fs-2xl);
  font-weight: 800;
  color: var(--accent-primary);
  opacity: 0.4;
  line-height: 1;
}
.popular-item a {
  font-size: var(--fs-sm);
  color: var(--text-primary);
  font-weight: 500;
  line-height: 1.4;
}
.popular-item a:hover { color: var(--accent-primary); }
@media (max-width: 1024px) {
  .layout-with-sidebar { grid-template-columns: 1fr; }
  .sidebar { position: static; }
}

/* --- Search --- */
.search-box {
  position: relative;
  max-width: 320px;
}
.search-box input {
  width: 100%;
  padding: var(--space-sm) var(--space-lg) var(--space-sm) 40px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: var(--fs-sm);
  outline: none;
  transition: border-color var(--transition-fast);
}
.search-box input:focus { border-color: var(--accent-primary); }
.search-box .search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: var(--fs-sm);
}

/* --- Page Header (for inner pages) --- */
.page-header {
  padding: calc(var(--header-height) + var(--space-3xl)) 0 var(--space-2xl);
  text-align: center;
  position: relative;
}
.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at center top, rgba(99,102,241,0.1), transparent 60%);
  pointer-events: none;
}
.page-header h1 { margin-bottom: var(--space-md); }
.page-header p { max-width: 600px; margin: 0 auto; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-sm);
  color: var(--text-muted);
  justify-content: center;
  margin-bottom: var(--space-lg);
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--accent-primary); }
.breadcrumb .sep { color: var(--text-muted); }

/* --- Contact Form --- */
.form-group {
  margin-bottom: var(--space-lg);
}
.form-group label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 500;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-primary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  outline: none;
  transition: border-color var(--transition-fast);
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent-primary);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* --- Tags --- */
.tags { display: flex; flex-wrap: wrap; gap: var(--space-sm); }
.tag {
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.tag:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* --- Stats Row --- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  margin: var(--space-2xl) 0;
}
.stat-item {
  text-align: center;
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
}
.stat-item .stat-number {
  font-family: var(--font-heading);
  font-size: var(--fs-3xl);
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-item .stat-label {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  margin-top: var(--space-xs);
}
@media (max-width: 768px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
}