/* Codility Solutions - Blog Styles */
:root {
  --color-bg: #0a0a0f;
  --color-bg-elevated: #12121a;
  --color-bg-card: #16161f;
  --color-text: #e8e8ed;
  --color-text-muted: #8b8b9a;
  --color-accent: #6366f1;
  --color-accent-hover: #818cf8;
  --color-accent-muted: rgba(99, 102, 241, 0.15);
  --color-border: rgba(255, 255, 255, 0.08);
  --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius: 12px;
  --radius-lg: 16px;
  --transition: 0.2s ease;
}

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

html { scroll-behavior: smooth; }

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

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Header ─────────────────────────────────────────── */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 32px;
}

.logo img { display: block; height: 30px; }
.logo-text {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.logo-text span { color: var(--color-accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

.btn-nav {
  background: var(--color-accent) !important;
  color: #fff !important;
  padding: 8px 18px;
  border-radius: 8px;
  font-weight: 600 !important;
  transition: background var(--transition) !important;
}
.btn-nav:hover { background: var(--color-accent-hover) !important; }

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.mobile-menu-btn span {
  display: block;
  width: 22px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── Main layout ─────────────────────────────────────── */
.main {
  padding-top: 96px;
  padding-bottom: 80px;
  min-height: 100vh;
}

/* ── Blog header ─────────────────────────────────────── */
.blog-page-header {
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 48px;
}

.blog-page-header h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 10px;
}

.blog-page-header p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  max-width: 520px;
}

/* ── Blog card list ──────────────────────────────────── */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.blog-card {
  display: flex;
  gap: 0;
  background: var(--color-bg-card);
  transition: background var(--transition);
  text-decoration: none;
  color: inherit;
}

.blog-card:hover { background: var(--color-bg-elevated); }

/* Thumbnail */
.blog-card-thumb {
  flex-shrink: 0;
  width: 200px;
  min-height: 140px;
  overflow: hidden;
  position: relative;
  background: var(--thumb-gradient, linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%));
}

.blog-card-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.blog-card:hover .blog-card-thumb img { transform: scale(1.04); }

/* Content */
.blog-card-body {
  flex: 1;
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  min-width: 0;
}

.blog-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-muted);
  padding: 3px 10px;
  border-radius: 20px;
  width: fit-content;
}

.blog-card-body h2 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.blog-card-body h2 a {
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
}

.blog-card-body h2 a:hover { color: var(--color-accent-hover); }

.blog-card-body p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 4px;
}

.blog-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.read-more {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}
.read-more:hover { color: var(--color-accent-hover); }

/* ── Pagination ──────────────────────────────────────── */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 48px;
}

.pagination button {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.pagination button:hover:not(:disabled) {
  background: var(--color-bg-elevated);
  border-color: var(--color-accent);
  color: var(--color-accent-hover);
}

.pagination button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.page-info {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  min-width: 110px;
  text-align: center;
}

/* ── Blog detail page ────────────────────────────────── */
.post-hero {
  width: 100%;
  max-height: 420px;
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin-bottom: 40px;
  background: var(--post-gradient, linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%));
  position: relative;
}

.post-hero img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  display: block;
}

.post-wrap {
  max-width: 760px;
  margin: 0 auto;
}

.post-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  margin-bottom: 32px;
  transition: color var(--transition);
}
.post-back:hover { color: var(--color-accent-hover); }

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

.post-date {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.post-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: 20px;
}

.post-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
}

.post-content {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
}

.post-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 40px 0 16px;
}

.post-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--color-accent-hover);
}

.post-content p {
  margin-bottom: 20px;
  color: var(--color-text-muted);
}

.post-content p strong,
.post-content li strong { color: var(--color-text); }

.post-content ul,
.post-content ol {
  padding-left: 24px;
  margin-bottom: 20px;
  color: var(--color-text-muted);
}

.post-content li { margin-bottom: 8px; }

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  padding: 2px 7px;
  border-radius: 5px;
  color: var(--color-accent-hover);
}

.post-content pre {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  overflow-x: auto;
  margin-bottom: 20px;
}

.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  color: var(--color-text);
}

.post-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 16px 20px;
  margin: 28px 0;
  background: var(--color-accent-muted);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.post-content blockquote p {
  margin: 0;
  font-style: italic;
  color: var(--color-text);
}

.post-cta {
  margin-top: 56px;
  padding: 40px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
}

.post-cta h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.post-cta p {
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.btn-primary {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  padding: 12px 28px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: background var(--transition);
}
.btn-primary:hover { background: var(--color-accent-hover); }

/* ── Footer ──────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer p { font-size: 0.85rem; color: var(--color-text-muted); }
.footer a { color: var(--color-text-muted); text-decoration: none; transition: color var(--transition); }
.footer a:hover { color: var(--color-accent-hover); }

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    padding: 20px 24px;
    gap: 20px;
  }
  .mobile-menu-btn { display: flex; }

  .blog-card-thumb {
    width: 120px;
    min-height: 110px;
  }

  .blog-card-body { padding: 16px 18px; }
  .blog-card-body h2 { font-size: 0.95rem; }

  .post-title { font-size: 1.6rem; }
  .post-cta { padding: 28px 20px; }
}

@media (max-width: 480px) {
  .blog-card { flex-direction: column; }
  .blog-card-thumb {
    width: 100%;
    height: 180px;
    min-height: unset;
  }
}