/* ── AI Blog Styles — InfraestructuraIT ───────────────────────────────────── */

:root {
  --bg:       #050c14;
  --surface:  #0a1628;
  --surface2: #0f1f38;
  --cyan:     #00d4ff;
  --purple:   #7c3aed;
  --accent:   #00ffcc;
  --orange:   #f97316;
  --text:     #e8f4f8;
  --muted:    #6b8fa8;
  --border:   rgba(0,212,255,0.12);
  --radius:   6px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-weight: 300;
  line-height: 1.6;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* ── NAV ── */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: .85rem 3rem;
  background: rgba(5,12,20,.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  display: flex; align-items: center; gap: .75rem;
  text-decoration: none;
  font-family: 'Space Mono', monospace;
  font-size: .85rem; color: var(--text); letter-spacing: .08em;
}
.nav-brand strong { color: var(--cyan); }

.nav-links { display: flex; gap: 1.5rem; }
.nav-links a {
  text-decoration: none; color: var(--muted);
  font-size: .75rem; font-family: 'Space Mono', monospace;
  letter-spacing: .1em; text-transform: uppercase;
  transition: color .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--cyan); }

/* ── HERO ── */
.blog-hero {
  position: relative;
  padding: 5rem 3rem 4rem;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}
.hero-grid::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 50% at 70% 50%, rgba(124,58,237,.08) 0%, transparent 70%);
}

.hero-inner { position: relative; z-index: 1; max-width: 860px; }

.hero-eyebrow {
  font-family: 'Space Mono', monospace;
  font-size: .65rem; letter-spacing: .3em;
  color: var(--cyan); text-transform: uppercase;
  margin-bottom: 1rem;
  display: flex; align-items: center; gap: .75rem;
}
.hero-eyebrow::before {
  content: ''; display: inline-block;
  width: 28px; height: 1px; background: var(--cyan);
}

.hero-title {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: clamp(2.5rem, 6vw, 5rem);
  line-height: .95; letter-spacing: -.02em;
  margin-bottom: 1.25rem;
}
.hero-title .accent {
  color: var(--cyan);
  -webkit-text-stroke: 0;
}

.hero-desc {
  font-size: 1.05rem; color: var(--muted);
  max-width: 580px; line-height: 1.75;
  margin-bottom: 2.5rem;
}

.hero-stats {
  display: flex; gap: 2.5rem; flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.stat { display: flex; flex-direction: column; gap: .2rem; }
.stat-num {
  font-family: 'Space Mono', monospace;
  font-size: 1.8rem; font-weight: 700;
  color: var(--cyan); line-height: 1;
}
.stat-label {
  font-size: .65rem; letter-spacing: .2em;
  color: var(--muted); text-transform: uppercase;
  font-family: 'Space Mono', monospace;
}

.last-update {
  font-size: .72rem; color: var(--muted);
  font-family: 'Space Mono', monospace;
}
.last-update span { color: var(--text); }

/* ── FILTER BAR ── */
.filter-bar {
  position: sticky; top: 57px; z-index: 90;
  background: rgba(5,12,20,.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: .85rem 3rem;
}

.filter-inner {
  display: flex; align-items: center;
  gap: .6rem; flex-wrap: wrap;
}

.filter-btn {
  display: flex; align-items: center; gap: .4rem;
  padding: .45rem 1rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: .72rem; font-family: 'Space Mono', monospace;
  letter-spacing: .08em; text-transform: uppercase;
  cursor: pointer; transition: all .2s;
  border-radius: var(--radius);
}
.filter-btn:hover { border-color: var(--fc, var(--cyan)); color: var(--fc, var(--cyan)); }
.filter-btn.active {
  background: color-mix(in srgb, var(--fc, var(--cyan)) 15%, transparent);
  border-color: var(--fc, var(--cyan));
  color: var(--fc, var(--cyan));
}
.filter-count {
  background: var(--surface2);
  padding: .1rem .4rem;
  border-radius: 10px;
  font-size: .6rem;
  color: var(--muted);
}

.search-wrap {
  position: relative; margin-left: auto;
}
.search-wrap input {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: .45rem 2.5rem .45rem .9rem;
  font-size: .8rem; font-family: 'Inter', sans-serif;
  border-radius: var(--radius);
  outline: none; width: 220px;
  transition: border-color .2s;
}
.search-wrap input:focus { border-color: var(--cyan); }
.search-wrap input::placeholder { color: var(--muted); }
.search-wrap svg {
  position: absolute; right: .75rem; top: 50%;
  transform: translateY(-50%);
  width: 14px; height: 14px; color: var(--muted);
  pointer-events: none;
}

/* ── MAIN LAYOUT ── */
.blog-main {
  position: relative; z-index: 1;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2.5rem;
  max-width: 1300px;
  margin: 0 auto;
  padding: 2.5rem 3rem;
}

.content-wrap { min-width: 0; }

/* ── DAY SECTION ── */
.day-section { margin-bottom: 3.5rem; }

.day-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: .75rem;
  border-bottom: 1px solid var(--border);
}
.day-label {
  display: flex; align-items: center; gap: .75rem;
  font-family: 'Space Mono', monospace;
}
.today-badge {
  font-size: .65rem; font-weight: 700;
  color: var(--cyan); letter-spacing: .2em;
  animation: pulse-badge 2s ease-in-out infinite;
}
@keyframes pulse-badge {
  0%,100% { opacity: 1; }
  50% { opacity: .4; }
}
.day-date {
  font-size: .8rem; color: var(--text);
  text-transform: capitalize;
}
.day-count {
  font-size: .65rem; color: var(--muted);
  font-family: 'Space Mono', monospace;
  letter-spacing: .1em;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

/* ── ARTICLE CARD ── */
.article-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
  transition: border-color .2s, transform .2s;
}
.article-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent, var(--cyan)), transparent);
  opacity: 0; transition: opacity .2s;
}
.article-card:hover { border-color: rgba(0,212,255,.3); transform: translateY(-2px); }
.article-card:hover::before { opacity: 1; }

.article-card.featured {
  grid-column: 1 / -1;
  border-color: rgba(0,212,255,.25);
}
.article-card.featured::before { opacity: 1; }

.card-header {
  display: flex; align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap; gap: .5rem;
}
.card-meta { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; }
.card-icon { font-size: 1rem; }
.card-category {
  font-family: 'Space Mono', monospace;
  font-size: .65rem; font-weight: 700;
  letter-spacing: .12em; text-transform: uppercase;
}
.card-tag {
  font-size: .6rem; padding: .15rem .6rem;
  border: 1px solid; border-radius: 20px;
  font-family: 'Space Mono', monospace;
  letter-spacing: .08em;
}
.card-read {
  font-size: .65rem; color: var(--muted);
  font-family: 'Space Mono', monospace;
}

.card-title {
  font-family: 'Syne', sans-serif;
  font-weight: 700; font-size: 1.05rem;
  line-height: 1.3; margin-bottom: .6rem;
  color: var(--text);
}
.article-card.featured .card-title { font-size: 1.3rem; }

.card-summary {
  font-size: .85rem; color: var(--muted);
  line-height: 1.65; margin-bottom: 1rem;
}

.card-body {
  font-size: .88rem; line-height: 1.75;
  color: #bdd4e4; margin-bottom: 1rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}
.card-body p { margin-bottom: .85rem; }
.card-body p:last-child { margin-bottom: 0; }
.card-body strong { color: var(--text); font-weight: 600; }
.card-body code {
  background: var(--surface2);
  border: 1px solid var(--border);
  padding: .15rem .4rem;
  border-radius: 3px;
  font-family: 'Space Mono', monospace;
  font-size: .8em;
  color: var(--cyan);
}
.card-body ul, .card-body ol {
  padding-left: 1.4rem;
  margin: .6rem 0;
}
.card-body li { margin-bottom: .35rem; }

.card-toggle {
  display: flex; align-items: center; gap: .4rem;
  background: transparent; border: 1px solid var(--border);
  color: var(--muted); cursor: pointer;
  font-size: .72rem; font-family: 'Space Mono', monospace;
  letter-spacing: .1em; text-transform: uppercase;
  padding: .45rem 1rem; border-radius: var(--radius);
  transition: all .2s;
}
.card-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.card-toggle.open { color: var(--cyan); border-color: var(--cyan); }
.toggle-icon {
  width: 14px; height: 14px;
  transition: transform .25s;
}
.card-toggle.open .toggle-icon { transform: rotate(180deg); }

/* ── EMPTY STATE ── */
.empty-state {
  text-align: center; padding: 5rem 2rem;
  color: var(--muted);
}
.empty-icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state h3 { font-family: 'Syne', sans-serif; font-size: 1.3rem; margin-bottom: .5rem; color: var(--text); }

/* ── SIDEBAR ── */
.blog-sidebar {
  display: flex; flex-direction: column; gap: 1.25rem;
}

.sidebar-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.sidebar-title {
  font-family: 'Space Mono', monospace;
  font-size: .65rem; letter-spacing: .2em;
  color: var(--cyan); text-transform: uppercase;
  margin-bottom: 1rem;
}

.sidebar-cat {
  display: flex; align-items: center; gap: .75rem;
  padding: .6rem .75rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .15s;
  border-left: 2px solid transparent;
}
.sidebar-cat:hover {
  background: var(--surface2);
  border-left-color: var(--fc, var(--cyan));
}
.sidebar-count {
  margin-left: auto;
  font-size: .7rem; color: var(--muted);
  font-family: 'Space Mono', monospace;
}

.sidebar-desc {
  font-size: .82rem; color: var(--muted);
  line-height: 1.7;
}
.sidebar-desc strong { color: var(--text); }

.cta-card { border-color: rgba(0,212,255,.25); }
.cta-btn {
  display: inline-block; margin-top: 1rem;
  background: var(--cyan); color: var(--bg);
  padding: .6rem 1.25rem;
  font-family: 'Space Mono', monospace;
  font-size: .72rem; font-weight: 700;
  letter-spacing: .08em; text-transform: uppercase;
  text-decoration: none; transition: opacity .2s;
  border-radius: var(--radius);
}
.cta-btn:hover { opacity: .85; }

.recent-item {
  display: flex; align-items: flex-start; gap: .6rem;
  padding: .6rem 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer; transition: color .15s;
}
.recent-item:last-child { border-bottom: none; }
.recent-item:hover .recent-title { color: var(--cyan); }
.recent-icon { flex-shrink: 0; font-size: .9rem; margin-top: .1rem; }
.recent-title { font-size: .8rem; line-height: 1.4; color: var(--muted); }

/* ── FOOTER ── */
.blog-footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--border);
  padding: 1.5rem 3rem;
}
.footer-inner {
  display: flex; align-items: center;
  justify-content: space-between;
  flex-wrap: wrap; gap: .75rem;
  font-size: .72rem; color: var(--muted);
  font-family: 'Space Mono', monospace;
}
.footer-powered strong { color: var(--cyan); }
.footer-inner a { color: var(--muted); text-decoration: none; }
.footer-inner a:hover { color: var(--cyan); }

/* ── HIDDEN / FILTERED ── */
.article-card.hidden { display: none; }
.day-section.hidden { display: none; }

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .blog-main { grid-template-columns: 1fr; }
  .blog-sidebar { display: grid; grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 700px) {
  .site-nav { padding: .75rem 1.25rem; }
  .blog-hero { padding: 3.5rem 1.25rem 2.5rem; }
  .filter-bar { padding: .75rem 1.25rem; }
  .blog-main { padding: 1.5rem 1.25rem; }
  .articles-grid { grid-template-columns: 1fr; }
  .blog-sidebar { grid-template-columns: 1fr; }
  .blog-footer { padding: 1.25rem; }
  .search-wrap input { width: 100%; }
  .filter-inner { gap: .4rem; }
}

/* ── Brand badge ── */
.card-brand {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: .6rem; padding: .15rem .55rem;
  border: 1px solid; border-radius: 20px;
  font-family: 'Space Mono', monospace;
  letter-spacing: .06em; font-weight: 700;
  text-transform: uppercase;
}

/* ── Source note ── */
.card-source {
  font-size: .75rem !important;
  color: var(--muted) !important;
  border-top: 1px solid var(--border);
  padding-top: .6rem !important;
  margin-top: .6rem !important;
  font-style: italic;
}