/* =========================================================
   FLASHFILL BLOG CSS - ajustes SEO/UX
   Archivo sugerido: static/css/blog.css
   ========================================================= */

:root {
  --ff-blue: #2563eb;
  --ff-blue-dark: #1d4ed8;
  --ff-blue-soft: #eff6ff;
  --ff-blue-border: #bfdbfe;
  --ff-dark: #0f172a;
  --ff-text: #334155;
  --ff-muted: #64748b;
  --ff-soft: #f8fafc;
  --ff-border: #e2e8f0;
  --ff-green: #16a34a;
  --ff-green-soft: #dcfce7;
  --ff-red: #b91c1c;
  --ff-red-soft: #fee2e2;
  --ff-radius-sm: 8px;
  --ff-radius-md: 12px;
  --ff-radius-lg: 16px;
  --ff-radius-xl: 20px;
  --ff-shadow-sm: 0 10px 24px rgba(15, 23, 42, 0.05);
  --ff-shadow-md: 0 18px 42px rgba(15, 23, 42, 0.07);
  --ff-shadow-lg: 0 26px 70px rgba(15, 23, 42, 0.10);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.blog-page {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #ffffff;
  color: var(--ff-text);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
}

.blog-container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.blog-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--ff-border);
}

.blog-nav {
  width: min(1120px, calc(100% - 32px));
  min-height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.blog-logo,
.blog-menu a,
.blog-btn-primary {
  text-decoration: none;
}

.blog-logo {
  display: inline-flex;
  align-items: center;
}

.blog-logo img {
  width: 155px;
  height: auto;
  display: block;
}

.blog-menu {
  display: flex;
  align-items: center;
  gap: 22px;
}

.blog-menu a {
  color: #475569;
  font-weight: 650;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

.blog-menu a:hover,
.blog-menu a[aria-current="page"] {
  color: var(--ff-blue);
}

.blog-nav-cta {
  background: var(--ff-blue);
  color: #ffffff !important;
  padding: 10px 16px;
  border-radius: var(--ff-radius-md);
  font-size: 0.92rem;
  font-weight: 800;
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.18);
  transition: background 0.2s ease, transform 0.2s ease;
}

.blog-nav-cta:hover {
  background: var(--ff-blue-dark);
  transform: translateY(-1px);
}

.article-wrapper {
  width: min(860px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 88px;
}

.article-header {
  padding-bottom: 36px;
  border-bottom: 1px solid var(--ff-border);
  margin-bottom: 38px;
}

.article-back {
  display: inline-flex;
  margin-bottom: 28px;
  color: var(--ff-blue);
  text-decoration: none;
  font-weight: 800;
  font-size: 0.95rem;
}

.blog-kicker {
  margin: 0 0 12px;
  color: var(--ff-blue);
  font-weight: 800;
  text-transform: uppercase;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
}

.article-header h1 {
  margin: 0 0 18px;
  color: var(--ff-dark);
  font-size: clamp(2rem, 4vw, 3.15rem);
  line-height: 1.08;
  letter-spacing: 0;
  font-weight: 800;
}

.article-summary {
  max-width: 780px;
  margin: 0 0 22px;
  color: var(--ff-muted);
  font-size: 1.05rem;
  line-height: 1.75;
}

.article-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.article-meta span,
.article-meta time {
  display: inline-flex;
  align-items: center;
  background: var(--ff-soft);
  border: 1px solid var(--ff-border);
  color: var(--ff-muted);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 0.82rem;
  font-weight: 750;
}

.article-content {
  color: var(--ff-text);
}

.article-content h2 {
  margin: 44px 0 16px;
  color: var(--ff-dark);
  font-size: clamp(1.45rem, 2.6vw, 2rem);
  line-height: 1.2;
  letter-spacing: 0;
  font-weight: 800;
  scroll-margin-top: 96px;
}

.article-content h3 {
  margin: 26px 0 10px;
  color: var(--ff-dark);
  font-size: 1.13rem;
  line-height: 1.3;
  font-weight: 800;
}

.article-content h4 {
  margin: 0 0 8px;
  color: var(--ff-dark);
  font-size: 1rem;
  font-weight: 800;
}

.article-content p {
  margin: 0 0 20px;
  font-size: 1rem;
  line-height: 1.75;
}

.article-content strong {
  color: var(--ff-dark);
  font-weight: 800;
}

.article-content ul,
.article-content ol {
  margin: 16px 0 24px;
  padding-left: 24px;
}

.article-content li {
  margin-bottom: 10px;
  font-size: 1rem;
  line-height: 1.75;
}

.article-content pre {
  margin: 16px 0 22px;
  padding: 16px 18px;
  border-radius: var(--ff-radius-lg);
  background: var(--ff-dark);
  color: #e2e8f0;
  font-size: 0.88rem;
  line-height: 1.65;
  overflow-x: auto;
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.10);
}

.article-content code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.article-toc {
  display: grid;
  gap: 8px;
  margin: 30px 0;
  padding: 20px 22px;
  border: 1px solid var(--ff-border);
  border-radius: var(--ff-radius-lg);
  background: var(--ff-soft);
}

.article-toc strong {
  margin-bottom: 4px;
}

.article-toc a {
  color: var(--ff-blue);
  text-decoration: none;
  font-weight: 700;
}

.article-toc a:hover {
  color: var(--ff-blue-dark);
}

.article-callout {
  margin: 30px 0;
  padding: 22px 24px;
  border-radius: var(--ff-radius-xl);
  background: var(--ff-blue-soft);
  border: 1px solid var(--ff-blue-border);
  color: #1e3a8a;
  font-size: 0.98rem;
  line-height: 1.7;
}

.article-checklist {
  list-style: none;
  padding-left: 0 !important;
}

.article-checklist li {
  position: relative;
  padding-left: 32px;
}

.article-checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 3px;
  width: 22px;
  height: 22px;
  background: var(--ff-green-soft);
  color: var(--ff-green);
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 0.8rem;
}

.article-clean-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0 24px;
}

.article-clean-list span {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--ff-soft);
  border: 1px solid var(--ff-border);
  color: var(--ff-text);
  font-size: 0.9rem;
  font-weight: 700;
}

.article-image-card {
  margin: 26px 0 34px;
  padding: 12px;
  border: 1px solid var(--ff-border);
  border-radius: var(--ff-radius-xl);
  background: #ffffff;
  box-shadow: var(--ff-shadow-md);
}

.article-image-card img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--ff-radius-lg);
  object-fit: cover;
  background: var(--ff-soft);
}

.article-image-card figcaption {
  margin: 12px 6px 2px;
  color: var(--ff-muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.article-tip-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin: 22px 0 34px;
}

.article-tip-card {
  padding: 22px;
  border-radius: var(--ff-radius-xl);
  border: 1px solid var(--ff-border);
  background: #ffffff;
  box-shadow: var(--ff-shadow-sm);
}

.article-tip-card .tip-label {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 5px 10px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.article-tip-card.is-good .tip-label {
  background: var(--ff-green-soft);
  color: #15803d;
}

.article-tip-card.is-bad .tip-label {
  background: var(--ff-red-soft);
  color: var(--ff-red);
}

.article-tip-card p {
  margin: 0 0 12px;
  color: var(--ff-muted);
  font-size: 0.94rem;
  line-height: 1.6;
}

.article-tip-card ul {
  margin: 0;
  padding-left: 18px;
}

.article-tip-card li {
  margin-bottom: 4px;
  font-size: 0.92rem;
  line-height: 1.5;
}

.article-formula {
  margin: 28px 0;
  padding: 22px 24px;
  text-align: center;
  background: #ffffff;
  border: 2px dashed var(--ff-blue-border);
  color: var(--ff-blue);
  border-radius: var(--ff-radius-xl);
  font-size: 1.12rem;
  line-height: 1.4;
  font-weight: 800;
}

.faq-list {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.faq-list details {
  background: #ffffff;
  border: 1px solid var(--ff-border);
  border-radius: var(--ff-radius-lg);
  padding: 18px 20px;
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.03);
}

.faq-list summary {
  cursor: pointer;
  color: var(--ff-dark);
  font-weight: 800;
}

.faq-list p {
  margin: 14px 0 0;
  color: var(--ff-muted);
}

.article-cta {
  margin-top: 50px;
  padding: 32px;
  border-radius: var(--ff-radius-xl);
  background: linear-gradient(135deg, var(--ff-blue-soft), #ffffff);
  border: 1px solid var(--ff-blue-border);
  text-align: center;
  box-shadow: var(--ff-shadow-sm);
}

.article-cta h2 {
  margin-top: 0;
  font-size: clamp(1.45rem, 2.5vw, 2rem);
}

.article-cta p {
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  color: var(--ff-muted);
}

.blog-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ff-blue);
  color: #ffffff;
  border: 0;
  border-radius: var(--ff-radius-md);
  padding: 14px 24px;
  font-weight: 800;
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.24);
  transition: transform 0.2s ease, background 0.2s ease;
}

.blog-btn-primary:hover {
  background: var(--ff-blue-dark);
  color: #ffffff;
  transform: translateY(-2px);
}

.blog-footer {
  border-top: 1px solid var(--ff-border);
  padding: 26px 0;
  background: #ffffff;
}

.blog-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.blog-footer p {
  margin: 0;
  color: var(--ff-muted);
  font-size: 0.92rem;
}

.blog-footer-links {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.blog-footer a {
  color: var(--ff-muted);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.92rem;
}

.blog-footer a:hover {
  color: var(--ff-blue);
}

@media (max-width: 900px) {
  .article-tip-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .blog-nav {
    min-height: auto;
    padding: 18px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .blog-logo img {
    width: 140px;
  }

  .blog-menu {
    width: 100%;
    gap: 12px;
    flex-wrap: wrap;
  }

  .blog-menu a {
    font-size: 0.92rem;
  }

  .article-wrapper {
    width: min(100% - 28px, 860px);
    padding-top: 34px;
  }

  .article-header h1 {
    font-size: clamp(2rem, 10vw, 2.65rem);
  }

  .article-content h2 {
    margin-top: 38px;
  }

  .article-toc,
  .article-cta {
    padding: 22px;
  }

  .blog-footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .blog-container {
    width: min(100% - 24px, 1120px);
  }

  .article-content pre {
    font-size: 0.82rem;
  }

  .article-clean-list span {
    padding: 7px 10px;
    font-size: 0.86rem;
  }
}