:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --accent: #38bdf8;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Nav */
header {
  background-color: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  text-decoration: none;
  letter-spacing: -0.5px;
}

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

nav a {
  color: var(--text-muted);
  text-decoration: none;
  margin-left: 1.5rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

nav a:hover {
  color: var(--accent);
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 4rem 1rem 3rem;
  background: radial-gradient(circle at top, #1e293b 0%, #0f172a 70%);
  border-bottom: 1px solid var(--border-color);
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: 999px;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(to right, #ffffff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.15rem;
  max-width: 650px;
  margin: 0 auto;
}

/* Posts Grid */
.posts-section {
  padding: 3rem 0;
}

.section-title {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

.post-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.post-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 12px 24px -10px rgba(0, 0, 0, 0.5);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: #334155;
}

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

.card-tag {
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

.card-title a {
  color: #fff;
  text-decoration: none;
}

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

.card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.card-meta {
  font-size: 0.85rem;
  color: #64748b;
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
  display: flex;
  justify-content: space-between;
}

/* Single Post Page */
.post-content {
  max-width: 800px;
  margin: 3rem auto;
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.featured-img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  border-radius: 10px;
  margin: 1.5rem 0 2rem;
}

.post-content h1 {
  font-size: 2.25rem;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

.post-content h2 {
  font-size: 1.6rem;
  margin: 2rem 0 1rem;
  color: var(--accent);
}

.post-content h3 {
  font-size: 1.25rem;
  margin: 1.5rem 0 0.75rem;
}

.post-content p {
  color: #cbd5e1;
  font-size: 1.05rem;
  margin-bottom: 1.2rem;
}

.post-content ul {
  margin: 1rem 0 1.5rem 1.5rem;
  color: #cbd5e1;
}

.post-content li {
  margin-bottom: 0.5rem;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: #0f172a;
  border-radius: 8px;
  overflow: hidden;
}

.post-content th, .post-content td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

.post-content th {
  background-color: #1e293b;
  color: var(--accent);
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 0;
  margin-top: 4rem;
  background: #0b1120;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  margin-left: 1.25rem;
}

.footer-links a:hover {
  color: #fff;
}

@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .featured-img { height: 220px; }
  .post-content { padding: 1.5rem; }
  .footer-content { flex-direction: column; gap: 1rem; text-align: center; }
}