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

:root {
  --bg: #F8F7F5;
  --fg: #111110;
  --fg2: #555551;
  --fg3: #999990;
  --accent: #4F5BD5;
  --accent-dim: #4F5BD520;
  --border: #E2E0DA;
  --card: #FFFFFF;
  --mono: 'JetBrains Mono', monospace;
  --sans: 'Inter', sans-serif;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0F0F0E;
    --fg: #F0EFE9;
    --fg2: #A8A89E;
    --fg3: #555551;
    --accent: #7B87E8;
    --accent-dim: #7B87E820;
    --border: #222220;
    --card: #181816;
  }
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--fg);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* NAV */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 3rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: border-color 0.3s;
}

.nav-logo {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 13px;
  color: var(--fg2);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.2s;
}

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

.nav-active {
  color: var(--accent) !important;
  font-weight: 500;
}

.nav-cta {
  font-size: 13px;
  font-family: var(--mono);
  color: var(--accent) !important;
  border: 1px solid var(--accent);
  padding: 0.4rem 1rem;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s !important;
}

.nav-cta:hover {
  background: var(--accent) !important;
  color: #fff !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--fg);
  transition: all 0.3s;
}

/* HERO */
.blog-hero {
  padding: 10rem 3rem 5rem;
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-eyebrow::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.blog-hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  color: var(--fg);
}

.cursor {
  display: inline-block;
  width: 3px;
  height: 0.85em;
  background: var(--accent);
  vertical-align: middle;
  margin-left: 2px;
  animation: blink 1.1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--fg2);
  max-width: 580px;
  line-height: 1.75;
}

/* FILTERS */
.filters {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 3rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
}

.filter-btn {
  font-family: var(--mono);
  font-size: 12px;
  padding: 0.5rem 1.2rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg2);
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 400;
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--fg);
}

.filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* BLOG GRID */
.blog-grid {
  max-width: 960px;
  margin: 0 auto;
  padding: 3rem 3rem 5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

/* BLOG CARD */
.blog-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color 0.2s, transform 0.2s;
  position: relative;
  overflow: hidden;
  opacity: 0;
  animation: fadeInUp 0.5s ease forwards;
}

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

.blog-card:nth-child(1) { animation-delay: 0s; }
.blog-card:nth-child(2) { animation-delay: 0.1s; }
.blog-card:nth-child(3) { animation-delay: 0.2s; }
.blog-card:nth-child(4) { animation-delay: 0.3s; }
.blog-card:nth-child(5) { animation-delay: 0.4s; }
.blog-card:nth-child(6) { animation-delay: 0.5s; }
.blog-card:nth-child(7) { animation-delay: 0.6s; }

.blog-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.blog-card:hover::before {
  transform: scaleX(1);
}

.blog-card:hover {
  border-color: var(--fg3);
  transform: translateY(-4px);
}

.blog-card.featured {
  grid-column: span 2;
  padding: 2.5rem;
  border-color: var(--accent);
  background: linear-gradient(135deg, var(--card) 0%, var(--accent-dim) 100%);
}

.card-content {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex: 1;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.card-badge {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg3);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-featured {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 500;
}

.card-date {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg3);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--fg);
  line-height: 1.3;
}

.featured .card-title {
  font-size: 1.5rem;
}

.card-excerpt {
  font-size: 0.9rem;
  color: var(--fg2);
  line-height: 1.7;
}

.card-meta {
  display: flex;
  gap: 1rem;
  align-items: center;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.read-time {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg3);
}

.card-category {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
}

.card-link {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-weight: 500;
  transition: gap 0.2s;
}

.card-link:hover {
  gap: 0.6rem;
}

/* NEWSLETTER */
.newsletter {
  background: var(--card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 4rem 3rem;
}

.newsletter-wrapper {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
}

.newsletter h2 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin-bottom: 0.75rem;
  color: var(--fg);
}

.newsletter p {
  color: var(--fg2);
  margin-bottom: 2rem;
  line-height: 1.75;
  font-size: 0.95rem;
}

.newsletter-form {
  display: flex;
  gap: 0.75rem;
  max-width: 480px;
  margin: 0 auto 0.75rem;
}

.newsletter-form input {
  flex: 1;
  padding: 0.85rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 14px;
  transition: border-color 0.2s;
}

.newsletter-form input:focus {
  outline: none;
  border-color: var(--accent);
}

.newsletter-form input::placeholder {
  color: var(--fg3);
}

.newsletter-form button {
  padding: 0.85rem 1.75rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s;
}

.newsletter-form button:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.newsletter-note {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg3);
}

/* FOOTER */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 3rem;
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

footer p {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg3);
}

footer a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.2s;
}

footer a:hover {
  opacity: 0.7;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  nav {
    padding: 1rem 1.5rem;
  }

  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
    display: none;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links li {
    border-bottom: 1px solid var(--border);
  }

  .nav-links a {
    display: block;
    padding: 1rem 1.5rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .blog-hero {
    padding: 7rem 1.5rem 3rem;
  }

  .filters {
    padding: 1.5rem 1.5rem;
  }

  .blog-grid {
    grid-template-columns: 1fr;
    padding: 2rem 1.5rem 3rem;
    gap: 1.25rem;
  }

  .blog-card.featured {
    grid-column: span 1;
    padding: 1.75rem;
  }

  .featured .card-title {
    font-size: 1.25rem;
  }

  .newsletter {
    padding: 3rem 1.5rem;
  }

  .newsletter-form {
    flex-direction: column;
  }

  .newsletter-form button {
    width: 100%;
  }

  footer {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
    padding: 2rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .blog-hero h1 {
    font-size: 2rem;
  }

  .card-title {
    font-size: 1.05rem;
  }

  .filters {
    gap: 0.5rem;
  }

  .filter-btn {
    font-size: 11px;
    padding: 0.4rem 0.9rem;
  }
}

/* HIDDEN CLASS FOR FILTERING */
.hidden {
  display: none !important;
}