/* =============================================
   Reflexiones sobre Tecnología e IA — Estilos
   ============================================= */

/* Fuentes */
@import url('https://fonts.googleapis.com/css2?family=Merriweather:ital,wght@0,400;0,700;1,400&family=Inter:wght@400;500;600&display=swap');

/* Variables */
:root {
  --color-bg: #fafaf8;
  --color-surface: #ffffff;
  --color-border: #e5e5e0;
  --color-text: #1a1a1a;
  --color-muted: #6b6b6b;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-tag-bg: #eff6ff;
  --color-tag-text: #1d4ed8;
  --font-serif: 'Merriweather', Georgia, serif;
  --font-sans: 'Inter', system-ui, sans-serif;
  --max-width: 720px;
  --radius: 6px;
}

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

/* Base */
html {
  font-size: 18px;
  scroll-behavior: smooth;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Layout */
.site-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  width: 100%;
}

/* ── Header / Navbar ── */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .site-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.site-nav a {
  font-size: 0.9rem;
  color: var(--color-muted);
  text-decoration: none;
  margin-left: 1.5rem;
  font-weight: 500;
  transition: color 0.15s;
}

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

/* ── Hero (index) ── */
.hero {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--color-border);
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.hero p {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 560px;
}

/* ── Article list ── */
.article-list {
  padding: 3rem 0;
  flex: 1;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 1.75rem;
}

.post-card {
  display: block;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  padding: 1.75rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.1s;
  margin-bottom: 1.25rem;
}

.post-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.08);
  transform: translateY(-1px);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
}

.post-card h2 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.35;
  color: var(--color-text);
}

.post-card p {
  font-size: 0.95rem;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.post-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  display: inline-block;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2em 0.65em;
  border-radius: 99px;
}

.read-more {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
}

/* ── Article page ── */
.article-back {
  padding: 1.5rem 0 0;
}

.back-link {
  font-size: 0.875rem;
  color: var(--color-muted);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: color 0.15s;
}

.back-link:hover {
  color: var(--color-accent);
}

.article-header {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--color-border);
}

.article-header .post-meta {
  margin-bottom: 1rem;
}

.article-header h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.article-header .lead {
  font-size: 1.1rem;
  color: var(--color-muted);
  line-height: 1.65;
}

/* Article body */
.article-body {
  padding: 2.5rem 0 4rem;
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text);
}

.article-body h2 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.01em;
}

.article-body h3 {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
}

.article-body p {
  margin-bottom: 1.4rem;
}

.article-body blockquote {
  border-left: 3px solid var(--color-accent);
  margin: 2rem 0;
  padding: 0.5rem 0 0.5rem 1.5rem;
  color: var(--color-muted);
  font-style: italic;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1.4rem 1.5rem;
}

.article-body li {
  margin-bottom: 0.4rem;
}

.article-body strong {
  font-weight: 700;
  color: var(--color-text);
}

.article-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.5rem 0;
}

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 2rem 0;
  text-align: center;
}

.site-footer p {
  font-size: 0.82rem;
  color: var(--color-muted);
}

.site-footer a {
  color: var(--color-muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-accent);
}

/* ── Responsive ── */
@media (max-width: 600px) {
  html {
    font-size: 16px;
  }

  .hero h1 {
    font-size: 1.7rem;
  }

  .article-header h1 {
    font-size: 1.6rem;
  }

  .site-nav a {
    margin-left: 1rem;
  }
}