/* ─── RESET & BASE ─── */
@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&display=swap');

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

:root {
  --color-primary: #2D5BE3;
  --color-primary-dark: #2347b8;
  --color-primary-deeper: #1a3a9e;
  --color-accent-blue: #60a5fa;
  --color-accent-peach: #f9d5bb;
  --color-bg: #f8fafc;
  --color-bg-mint: #eff3ff;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-text-light: #64748b;
  --color-text-lighter: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --font-body: "Manrope", system-ui, -apple-system, sans-serif;
  --max-width: 1140px;
  --content-width: 760px;
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.1);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a {
  color: var(--color-primary-dark);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--color-primary-deeper);
}

img {
  max-width: 100%;
  height: auto;
}

/* ─── HEADER ─── */
.site-header {
  background: var(--color-surface);
  padding: 0.85rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--color-border-light);
  backdrop-filter: blur(12px);
  background: rgba(255,255,255,0.92);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.logo span {
  color: var(--color-text-light);
  font-weight: 500;
}
.logo:hover {
  color: var(--color-primary-deeper);
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}
.main-nav a {
  color: var(--color-text-light);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-md);
  transition: all var(--transition);
}
.main-nav a:hover {
  color: var(--color-primary-dark);
  background: var(--color-bg-mint);
  text-decoration: none;
}

/* ─── FOOTER ─── */
.site-footer {
  background: var(--color-text);
  color: var(--color-text-lighter);
  padding: 2.5rem 0;
  margin-top: 5rem;
  font-size: 0.85rem;
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.site-footer ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}
.site-footer a {
  color: var(--color-text-lighter);
  transition: color var(--transition);
}
.site-footer a:hover {
  color: #fff;
}

/* ─── BREADCRUMB ─── */
.breadcrumb {
  max-width: var(--content-width);
  margin: 0 auto;
}
.breadcrumb ol {
  list-style: none;
  display: flex;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--color-text-lighter);
  padding: 1.25rem 0 0.5rem;
}
.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 0.4rem;
  color: var(--color-border);
}
.breadcrumb a {
  color: var(--color-text-light);
}
.breadcrumb a:hover {
  color: var(--color-primary-dark);
}

/* ─── BLOG POST ─── */
.blog-post {
  max-width: var(--content-width);
  margin: 0 auto;
}

.post-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--color-border-light);
}

.category-tag {
  display: inline-block;
  background: var(--color-bg-mint);
  color: var(--color-primary-dark);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-2xl);
  letter-spacing: 0.06em;
  margin-bottom: 0.85rem;
  text-transform: uppercase;
}

.post-header h1 {
  font-family: var(--font-body);
  font-size: 2.1rem;
  font-weight: 800;
  line-height: 1.22;
  color: var(--color-text);
  margin-bottom: 0.85rem;
  letter-spacing: -0.025em;
}

.post-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.83rem;
  color: var(--color-text-light);
  flex-wrap: wrap;
}
.post-meta span,
.post-meta time {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* ─── POST FEATURED IMAGE ─── */
.post-featured-image {
  margin-bottom: 2rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.post-featured-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* ─── POST CONTENT ─── */
.post-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 2.5rem 0 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary);
  letter-spacing: -0.015em;
}

.post-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 1.75rem 0 0.5rem;
}

.post-content p {
  margin-bottom: 1.1rem;
  color: var(--color-text);
  line-height: 1.8;
}

.post-content ul,
.post-content ol {
  margin: 0.85rem 0 1.25rem 1.5rem;
}
.post-content li {
  margin-bottom: 0.4rem;
  line-height: 1.7;
}

.post-content strong {
  font-weight: 700;
  color: var(--color-text);
}

/* ─── TABLES ─── */
.post-content table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.75rem 0;
  font-size: 0.9rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
}
.post-content th {
  background: var(--color-primary);
  color: #fff;
  text-align: left;
  padding: 0.85rem 1.1rem;
  font-weight: 600;
  font-size: 0.84rem;
  letter-spacing: 0.02em;
}
.post-content td {
  padding: 0.75rem 1.1rem;
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text);
}
.post-content tr:last-child td {
  border-bottom: none;
}
.post-content tr:nth-child(even) {
  background: var(--color-bg);
}
.post-content tr:hover {
  background: var(--color-bg-mint);
}

/* ─── FAQ ─── */
.faq-section {
  max-width: var(--content-width);
  margin: 3.5rem auto 0;
}
.faq-section h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary);
}

details {
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  margin-bottom: 0.6rem;
  overflow: hidden;
  transition: box-shadow var(--transition);
}
details:hover {
  box-shadow: var(--shadow-sm);
}
details summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-surface);
  transition: background var(--transition);
  list-style: none;
}
details summary::-webkit-details-marker {
  display: none;
}
details summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  margin-right: 0.75rem;
  background: var(--color-bg-mint);
  color: var(--color-primary-dark);
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}
details[open] summary::before {
  content: "−";
}
details summary:hover {
  background: var(--color-bg);
}
details[open] summary {
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-bg);
}
details p {
  padding: 1.1rem 1.25rem;
  color: var(--color-text-light);
  line-height: 1.75;
}

/* ─── RELATED POSTS ─── */
.related-posts {
  max-width: var(--content-width);
  margin: 2.5rem auto 0;
  padding: 1.75rem;
  background: var(--color-bg-mint);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
}
.related-posts h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
  color: var(--color-text);
}
.related-posts ul {
  list-style: none;
}
.related-posts li {
  margin-bottom: 0.5rem;
}
.related-posts li::before {
  content: "\2192";
  margin-right: 0.6rem;
  color: var(--color-primary-dark);
  font-weight: 600;
}
.related-posts a {
  font-weight: 500;
}

/* ─── HOMEPAGE ─── */
.hero {
  text-align: center;
  padding: 4rem 0 2.5rem;
}
.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 0.75rem;
  letter-spacing: -0.03em;
}
.hero h1 .accent {
  color: var(--color-primary-dark);
}
.hero p {
  font-size: 1.1rem;
  color: var(--color-text-light);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.section-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.25rem;
}

.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}
.post-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

/* ─── POST CARD IMAGE ─── */
.post-card-image {
  display: block;
  overflow: hidden;
  aspect-ratio: 1200/630;
  background: var(--color-bg-mint);
}
.post-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}
.post-card:hover .post-card-image img {
  transform: scale(1.03);
}

.post-card-body {
  padding: 1.5rem;
}
.post-card-body .category-tag {
  font-size: 0.65rem;
  margin-bottom: 0.6rem;
}
.post-card-body h2 {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.38;
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}
.post-card-body h2 a {
  color: var(--color-text);
  transition: color var(--transition);
}
.post-card-body h2 a:hover {
  color: var(--color-primary-dark);
  text-decoration: none;
}
.post-card-body p {
  font-size: 0.87rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-card-meta {
  font-size: 0.78rem;
  color: var(--color-text-lighter);
  display: flex;
  gap: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--color-border-light);
}

/* ─── CTA ─── */
.cta-text {
  display: inline-block;
  margin-top: 1.25rem;
  padding: 0.7rem 1.75rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-2xl);
  font-weight: 600;
  font-size: 0.92rem;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}
.cta-text:hover {
  background: var(--color-primary-dark);
  text-decoration: none;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* ─── CATEGORY CHIPS ─── */
.category-chips {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 1.5rem;
}
.category-chip {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: var(--color-surface);
  color: var(--color-text-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  font-size: 0.82rem;
  font-weight: 500;
  transition: all var(--transition);
}
.category-chip:hover {
  background: var(--color-bg-mint);
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
  text-decoration: none;
}

/* ─── CATEGORY PAGE ─── */
.category-header {
  text-align: center;
  padding: 3rem 0 2rem;
}
.category-header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.025em;
}
.category-header p {
  color: var(--color-text-light);
  margin-top: 0.5rem;
  font-size: 1rem;
}

/* ─── RESPONSIVE ─── */
@media (max-width: 768px) {
  .post-header h1 {
    font-size: 1.65rem;
  }
  .hero h1 {
    font-size: 1.85rem;
  }
  .hero {
    padding: 2.5rem 0 1.5rem;
  }
  .post-grid {
    grid-template-columns: 1fr;
  }
  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
  }
  .main-nav ul {
    gap: 0.15rem;
  }
  .main-nav a {
    padding: 0.35rem 0.65rem;
    font-size: 0.82rem;
  }
  .post-content h2 {
    font-size: 1.25rem;
  }
  .post-content table {
    font-size: 0.82rem;
  }
  .post-content th,
  .post-content td {
    padding: 0.6rem 0.75rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }
  .post-card-body {
    padding: 1.15rem;
  }
}