/* Header & Navigation */
.header {
  background-color: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--glass-shadow);
  transition: var(--transition-smooth);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  letter-spacing: -0.03em;
}

.logo span {
  color: var(--accent-color);
  position: relative;
  display: inline-block;
}

.logo span::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--accent-color);
  opacity: 0.15;
  border-radius: var(--radius-full);
}

.nav-links {
  display: flex;
  gap: 2.25rem;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
  position: relative;
  padding: 0.25rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-color);
  transition: var(--transition-smooth);
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-links a.active {
  color: var(--accent-color);
}
.nav-links a.active::after {
  width: 100%;
}

/* Theme Toggle Button */
.theme-toggle {
  background: var(--bg-surface-hover);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  color: var(--text-primary);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  transition: var(--transition-smooth);
}

.theme-toggle:hover {
  background-color: var(--border-strong);
  transform: rotate(15deg) scale(1.05);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.925rem;
  cursor: pointer;
  transition: var(--transition-elastic);
  border: none;
  font-family: var(--font-sans);
  letter-spacing: -0.01em;
  gap: 0.5rem;
}

.btn-primary {
  background-color: var(--text-primary);
  color: var(--bg-surface);
  border: 1px solid var(--border-strong);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
}

.btn-accent {
  background-color: var(--accent-color);
  color: white;
  box-shadow: var(--shadow-accent);
}

.btn-accent:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -4px rgba(var(--accent-rgb), 0.35);
}

/* Premium Hero Section */
.hero-section {
  position: relative;
  background-color: #070b14;
  background-image: 
    radial-gradient(at 0% 0%, rgba(239, 68, 68, 0.12) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(124, 58, 237, 0.1) 0px, transparent 50%),
    linear-gradient(135deg, rgba(7, 11, 20, 0.97) 0%, rgba(15, 23, 42, 0.94) 100%),
    url('https://images.unsplash.com/photo-1502877338535-766e1452684a?auto=format&fit=crop&q=80&w=1200');
  background-size: cover;
  background-position: center;
  color: white;
  padding: 5.5rem 0;
  border-bottom: 1px solid var(--border-strong);
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.22fr 0.78fr;
  gap: 4rem;
  align-items: center;
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--accent-color);
  padding: 0.4rem 1.05rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
  backdrop-filter: blur(4px);
  animation: pulse-glow 2.5s infinite alternate;
}

@keyframes pulse-glow {
  0% { box-shadow: 0 0 4px rgba(239, 68, 68, 0.2); }
  100% { box-shadow: 0 0 14px rgba(239, 68, 68, 0.4); }
}

.hero-title {
  color: white;
  font-size: 3.15rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1.25rem;
  font-family: var(--font-display);
  letter-spacing: -0.03em;
}

.hero-title span {
  background: linear-gradient(to right, #ffffff, var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.05rem;
  margin-bottom: 2rem;
  opacity: 0.8;
  font-weight: 400;
  line-height: 1.625;
  max-width: 600px;
}

/* Search Bar Wrapper */
.search-container {
  max-width: 520px;
  position: relative;
  z-index: 10;
  margin-bottom: 1.5rem;
}

.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 0.25rem 0.5rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition-smooth);
}

.search-wrapper:focus-within {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--accent-color);
  box-shadow: 0 0 30px rgba(var(--accent-rgb), 0.2);
}

.search-icon {
  margin-left: 0.75rem;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.95rem;
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.75rem 0.75rem;
  background: transparent;
  border: none;
  color: white;
  font-size: 0.95rem;
  font-family: var(--font-sans);
}

.search-input:focus {
  outline: none;
}

.search-input::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

/* Popular Keyword Tags */
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
}

.hero-tags-label {
  color: var(--text-muted);
  font-weight: 500;
}

.hero-tag-link {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.75);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  transition: var(--transition-smooth);
}

.hero-tag-link:hover {
  background: rgba(var(--accent-rgb), 0.15);
  color: white;
  border-color: var(--accent-color);
  transform: translateY(-1px);
}

/* Premium 3D Rotating Showcase Card */
.hero-showcase {
  background: rgba(17, 24, 39, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-lg), 0 20px 50px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  position: relative;
  transform: perspective(1000px) rotateY(-8deg) rotateX(6deg);
  transition: var(--transition-elastic);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.hero-showcase:hover {
  transform: perspective(1000px) rotateY(0deg) rotateX(0deg) translateY(-6px);
  box-shadow: var(--shadow-lg), 0 25px 60px rgba(var(--accent-rgb), 0.15);
  border-color: rgba(var(--accent-rgb), 0.3);
}

.showcase-img-wrapper {
  width: 100%;
  height: 180px;
  overflow: hidden;
  border-radius: var(--radius-md);
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.showcase-img {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: transform 0.8s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.hero-showcase:hover .showcase-img {
  transform: scale(1.04);
}

.showcase-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.showcase-badge {
  background: linear-gradient(135deg, var(--accent-color), #ec4899);
  color: white;
  font-size: 0.675rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
  box-shadow: 0 2px 10px rgba(var(--accent-rgb), 0.3);
}

.showcase-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: white;
  line-height: 1.35;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
  text-align: left;
}

.showcase-title a:hover {
  color: var(--accent-color);
}

.showcase-desc {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.65);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0.75rem;
  line-height: 1.5;
  text-align: left;
}

.showcase-link {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-color);
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: var(--transition-smooth);
}

.showcase-link:hover {
  color: white;
  gap: 0.5rem;
}

/* Category Navigation Tabs */
.tabs-container {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 2.25rem 0;
  overflow-x: auto;
  padding: 0.4rem;
  gap: 0.65rem;
  -webkit-overflow-scrolling: touch;
}

.tabs-container::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-elastic);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.tab-btn:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.tab-btn.active {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
  box-shadow: var(--shadow-accent);
}

/* Redesigned Cards */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2.25rem;
  transition: var(--transition-smooth);
}

.card {
  background-color: var(--bg-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition-elastic);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  position: relative;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

.card-img-wrapper {
  position: relative;
  width: 100%;
  height: 200px;
  overflow: hidden;
  background-color: var(--bg-surface-hover);
}

.card-img {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: transform 0.7s cubic-bezier(0.165, 0.84, 0.44, 1);
}

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

.card-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

/* Category Pill Badges */
.card-category {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 700;
  margin-bottom: 0.75rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  display: inline-block;
  align-self: flex-start;
  transition: var(--transition-smooth);
}

/* Category specific coloring using data attributes */
.card[data-category="차량 관리"] .card-category {
  background: rgba(37, 99, 235, 0.07);
  color: var(--color-tag-car-care);
}
.card[data-category="신차 소식"] .card-category {
  background: rgba(124, 58, 237, 0.07);
  color: var(--color-tag-new-car);
}
.card[data-category="드라이빙 팁"] .card-category {
  background: rgba(219, 39, 119, 0.07);
  color: var(--color-tag-driving-tip);
}
.card[data-category="친환경 & EV"] .card-category {
  background: rgba(5, 150, 105, 0.07);
  color: var(--color-tag-eco-ev);
}

.card-title {
  font-size: 1.225rem;
  margin-bottom: 0.75rem;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  height: 3.3em;
}

.card-title a {
  color: var(--text-primary);
  font-weight: 700;
  transition: var(--transition-smooth);
}

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

.card-excerpt {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  height: 4.88em;
  line-height: 1.625;
}

/* Card Metadata Footer */
.card-meta {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.775rem;
  color: var(--text-muted);
}

.card-meta-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* Footer Section */
.footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 3.5rem 0 2rem 0;
  margin-top: 4.5rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-col {
  display: flex;
  flex-direction: column;
}

.footer-col h4 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links li {
  margin-bottom: 0.65rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: var(--transition-smooth);
}

.footer-links a:hover {
  color: var(--accent-color);
  padding-left: 3px;
}

.footer-bottom {
  text-align: center;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.825rem;
}

/* Responsive adjustment */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.1rem;
  }
  .nav-links {
    display: none;
  }
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}