:root {
  --primary: #059669;
  --primary-dark: #047857;
  --primary-light: #ecfdf5;
  --slate-900: #0f172a;
  --slate-800: #1e293b;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-500: #64748b;
  --slate-300: #cbd5e1;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f8fafc;
  --white: #ffffff;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-serif: 'Lora', Georgia, serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--slate-50);
  color: var(--slate-800);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Top bar */
.top-bar {
  background: var(--slate-900);
  color: var(--slate-300);
  font-size: 0.82rem;
  padding: 6px 0;
  border-bottom: 1px solid var(--slate-800);
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-bar .date {
  color: var(--slate-400);
}

/* Header */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--slate-200);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
}

.logo {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--slate-900);
  letter-spacing: -0.03em;
}

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

.tagline {
  font-size: 0.78rem;
  color: var(--slate-500);
  margin-top: 2px;
  font-weight: 500;
}

.main-nav {
  display: flex;
  gap: 24px;
}

.main-nav a {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--slate-600);
  transition: color 0.15s ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary);
}

/* Layout */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 40px;
  margin-top: 36px;
  margin-bottom: 60px;
}

/* Hero card */
.hero-card {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: 16px;
  padding: 36px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hero-card:hover {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
}

.badge-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 10px;
  border-radius: 999px;
}

.badge-primary {
  background: var(--primary-light);
  color: var(--primary-dark);
}

.read-time {
  font-size: 0.8rem;
  color: var(--slate-500);
}

.hero-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--slate-900);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-title a:hover {
  color: var(--primary);
}

.hero-excerpt {
  font-size: 1.05rem;
  color: var(--slate-600);
  line-height: 1.65;
  margin-bottom: 24px;
}

.meta-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--slate-500);
  font-weight: 500;
}

/* Ad Placeholders (for Google AdSense preview) */
.ad-placeholder {
  margin: 32px 0;
  text-align: center;
}

.ad-label {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--slate-400);
  margin-bottom: 6px;
}

.ad-box {
  background: var(--slate-100);
  border: 1px dashed var(--slate-300);
  border-radius: 8px;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--slate-500);
  font-size: 0.88rem;
  font-weight: 600;
}

.ad-box-sidebar {
  background: var(--slate-100);
  border: 1px dashed var(--slate-300);
  border-radius: 8px;
  height: 250px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--slate-500);
  font-size: 0.85rem;
  font-weight: 600;
}

/* Recent Posts */
.section-heading {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--slate-900);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.post-card {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.post-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.04);
}

.category-tag {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.post-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--slate-900);
  margin-bottom: 10px;
}

.post-title a:hover {
  color: var(--primary);
}

.post-summary {
  font-size: 0.88rem;
  color: var(--slate-600);
  line-height: 1.55;
  margin-bottom: 16px;
  flex-grow: 1;
}

.post-meta {
  font-size: 0.78rem;
  color: var(--slate-500);
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.sidebar-widget {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: 14px;
  padding: 24px;
}

.sidebar-widget h3 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--slate-900);
  margin-bottom: 12px;
}

.newsletter-widget {
  background: linear-gradient(135deg, #ecfdf5 0%, #ffffff 100%);
  border-color: #a7f3d0;
}

.newsletter-widget p {
  font-size: 0.86rem;
  color: var(--slate-600);
  margin-bottom: 16px;
}

.newsletter-form input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--slate-300);
  border-radius: 8px;
  font-size: 0.9rem;
  margin-bottom: 10px;
  outline: none;
}

.newsletter-form input:focus {
  border-color: var(--primary);
}

.newsletter-form button {
  width: 100%;
  padding: 12px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s ease;
}

.newsletter-form button:hover {
  background: var(--primary-dark);
}

.quick-tips-list {
  list-style: none;
  font-size: 0.88rem;
  color: var(--slate-700);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quick-tips-list li {
  position: relative;
  padding-left: 18px;
}

.quick-tips-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 800;
}

/* Article Page Styling */
.article-container {
  max-width: 820px;
  margin: 40px auto 80px;
  padding: 0 20px;
}

.article-header {
  margin-bottom: 32px;
}

.article-header h1 {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--slate-900);
  margin-top: 14px;
  margin-bottom: 16px;
  letter-spacing: -0.025em;
}

.article-body {
  font-family: var(--font-serif);
  font-size: 1.12rem;
  line-height: 1.85;
  color: #27272a;
}

.article-body p {
  margin-bottom: 24px;
}

.article-body h2 {
  font-family: var(--font-sans);
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--slate-900);
  margin-top: 44px;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.article-body h3 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--slate-800);
  margin-top: 28px;
  margin-bottom: 12px;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 28px;
}

.article-body li {
  margin-bottom: 8px;
}

.callout-box {
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  padding: 20px 24px;
  border-radius: 0 12px 12px 0;
  margin: 32px 0;
  font-family: var(--font-sans);
  font-size: 0.96rem;
  color: var(--slate-800);
}

.callout-box strong {
  color: var(--primary-dark);
}

/* Footer */
.site-footer {
  background: var(--slate-900);
  color: var(--slate-300);
  padding: 60px 0 30px;
  border-top: 1px solid var(--slate-800);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 2fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  color: var(--white);
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.88rem;
  color: var(--slate-400);
  max-width: 320px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links h4 {
  color: var(--white);
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.footer-links a {
  font-size: 0.86rem;
  color: var(--slate-400);
}

.footer-links a:hover {
  color: var(--white);
}

.footer-legal {
  font-size: 0.8rem;
  color: var(--slate-500);
}

.footer-legal .disclaimer {
  margin-top: 8px;
  font-size: 0.74rem;
  color: var(--slate-600);
  line-height: 1.5;
}

/* Responsive */
@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
  .posts-grid {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    grid-template-columns: 1fr;
  }
}