/* ProductIA Design System v2
   DESIGN_VARIANCE: 7 | MOTION_INTENSITY: 6 | VISUAL_DENSITY: 4
   Body: Outfit (imported below) | Display: Poppins (HTML link)
   Palette: Deep navy-800 + sky-500 accent — avoids AI-purple default
*/
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700&display=swap');

/* ── TOKENS ───────────────────────────────────────────────────────── */
:root {
  /* Brand blues (kept from v1, refined) */
  --color-primary:       #1d4ed8;
  --color-primary-dark:  #1e3a8a;
  --color-primary-light: #eff6ff;

  /* Secondary violet */
  --color-secondary:       #7c3aed;
  --color-secondary-light: #f5f3ff;

  /* Sky accent — the design differentiator */
  --color-accent:  #0ea5e9;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-dark:    #0f172a;

  /* Neutrals — zinc family (cooler, more refined than gray) */
  --color-gray-900: #18181b;
  --color-gray-800: #27272a;
  --color-gray-700: #3f3f46;
  --color-gray-600: #52525b;
  --color-gray-500: #71717a;
  --color-gray-400: #a1a1aa;
  --color-gray-300: #d4d4d8;
  --color-gray-200: #e4e4e7;
  --color-gray-100: #f4f4f5;
  --color-gray-50:  #fafafa;
  --color-white:    #ffffff;

  /* Typography */
  --font-sans:    'Outfit', system-ui, -apple-system, sans-serif;
  --font-display: 'Poppins', 'Outfit', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Consolas', monospace;

  /* Radii — consistent scale */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;

  /* Shadows — blue-tinted, softer */
  --shadow-sm: 0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
  --shadow-md: 0 4px 16px rgba(15,23,42,.08), 0 2px 6px rgba(15,23,42,.04);
  --shadow-lg: 0 12px 40px rgba(15,23,42,.10), 0 4px 12px rgba(15,23,42,.05);
  --shadow-xl: 0 20px 60px rgba(15,23,42,.13), 0 8px 24px rgba(15,23,42,.07);
  --shadow-btn: 0 2px 8px rgba(29,78,216,.32);
  --shadow-btn-hover: 0 4px 18px rgba(29,78,216,.44);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-io:  cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 220ms var(--ease-io);
  --t-base: 260ms var(--ease-out);
  --t-slow: 440ms var(--ease-out);

  /* Layout */
  --max-width: 1240px;
  --max-width-content: 780px;
}

/* ── RESET & BASE ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-sans);
  color: var(--color-gray-800);
  background: #f8fafc;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul, ol { padding-left: 1.5rem; margin-bottom: 1rem; }
li { margin-bottom: 0.4rem; }

/* ── TYPOGRAPHY ───────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--color-gray-900);
}

h1 { font-size: clamp(1.875rem, 4.5vw, 3rem); }
h2 { font-size: clamp(1.375rem, 3vw, 2rem); }
h3 { font-size: clamp(1.125rem, 2.5vw, 1.375rem); }
h4 { font-size: 1.0625rem; font-family: var(--font-sans); }
h5 { font-size: 0.8125rem; font-family: var(--font-sans); text-transform: uppercase; letter-spacing: .07em; }

p { margin-bottom: 1rem; color: var(--color-gray-700); }
p:last-child { margin-bottom: 0; }
strong { font-weight: 600; color: var(--color-gray-900); }

code {
  font-family: var(--font-mono);
  font-size: .875em;
  background: var(--color-gray-100);
  padding: .15em .4em;
  border-radius: var(--radius-sm);
  color: var(--color-primary-dark);
}

/* ── LAYOUT ───────────────────────────────────────────────────────── */
.container        { max-width: var(--max-width);         margin: 0 auto; padding: 0 1.5rem; }
.container-narrow { max-width: var(--max-width-content); margin: 0 auto; padding: 0 1.5rem; }
.section    { padding: 5rem 0; }
.section-sm { padding: 3rem 0; }

/* ── GRIDS ────────────────────────────────────────────────────────── */
.grid-2    { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; }
.grid-3    { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.grid-4    { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.75rem; }

/* ── READING PROGRESS BAR ─────────────────────────────────────────── */
.progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  z-index: 9999;
  transition: width 80ms linear;
  pointer-events: none;
  border-radius: 0 2px 2px 0;
}

/* ── SCROLL REVEAL ────────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--t-slow), transform var(--t-slow);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 80ms; }
.reveal-delay-2 { transition-delay: 160ms; }
.reveal-delay-3 { transition-delay: 240ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ── NAVIGATION ───────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.90);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  border-color: var(--color-gray-200);
  box-shadow: 0 1px 20px rgba(15,23,42,.07);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  height: 68px;
  gap: 0;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-gray-900);
  white-space: nowrap;
  margin-right: auto;
  flex-shrink: 0;
}

.nav-logo .logo-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  display: block;
  object-fit: contain;
  flex-shrink: 0;
}

.nav-logo span.accent { color: var(--color-accent); }

.nav-logo .logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-tagline {
  font-size: 0.5625rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-gray-500);
  white-space: nowrap;
  font-family: var(--font-body);
  margin-top: 1px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.125rem;
  list-style: none;
  padding: 0; margin: 0;
  height: 100%;
}

.nav-menu > li {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.nav-menu > li > a {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-gray-600);
  border-radius: var(--radius-md);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

.nav-menu > li > a:hover,
.nav-menu > li > a.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* Dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown > a::after { content: ' ▾'; font-size: 0.65rem; opacity: 0.6; }

.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  min-width: 220px;
  padding: 0.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-base), transform var(--t-base);
  z-index: 200;
}

.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.dropdown-menu li a {
  display: block;
  padding: 0.5rem 0.875rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-gray-700);
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}
.dropdown-menu li a:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.nav-actions { margin-left: 1rem; flex-shrink: 0; }

.btn-nav {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1.125rem;
  background: var(--color-primary);
  color: white !important;
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-btn);
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn-nav:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-btn-hover);
  transform: translateY(-1px);
  color: white !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-gray-700);
  border-radius: 2px;
  transition: transform var(--t-base), opacity var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ── BUTTONS ──────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6875rem 1.375rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition), color var(--transition), border-color var(--transition);
  border: 1.5px solid transparent;
  text-decoration: none;
  white-space: nowrap;
  line-height: 1;
}
.btn:active { transform: translateY(1px) scale(0.99) !important; }

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), #2563eb);
  color: white;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-btn);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  border-color: var(--color-primary-dark);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn-hover);
}

.btn-secondary {
  background: white;
  color: var(--color-primary);
  border-color: #bfdbfe;
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border-color: #93c5fd;
  transform: translateY(-1px);
}

.btn-white {
  background: white;
  color: var(--color-primary);
  border-color: rgba(255,255,255,.3);
}
.btn-white:hover {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.btn-lg { padding: 0.875rem 2rem; font-size: 1.0625rem; }
.btn-sm { padding: 0.4375rem 0.875rem; font-size: 0.8125rem; }

/* ── HERO ─────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  background: linear-gradient(135deg, #0c1a47 0%, #1e3a8a 55%, #312e81 100%);
  overflow: hidden;
  padding: 6rem 0 5rem;
  text-align: center;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none'%3E%3Ccircle cx='30' cy='30' r='1.5' fill='%23ffffff' fill-opacity='0.04'/%3E%3C/g%3E%3C/svg%3E");
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 48px;
  background: linear-gradient(to top, #f8fafc, transparent);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.20);
  color: #93c5fd;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  backdrop-filter: blur(8px);
}
.hero h1 {
  color: white;
  margin-bottom: 1.25rem;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
  letter-spacing: -0.03em;
}
.hero h1 .gradient-text {
  background: linear-gradient(135deg, #60a5fa, #a78bfa, #34d399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.125rem;
  color: rgba(255,255,255,.75);
  max-width: 580px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}
.hero-actions {
  display: flex; gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}
.hero-stats { display: flex; gap: 3rem; justify-content: center; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.hero-stat .number {
  display: block;
  font-family: var(--font-display);
  font-size: 1.875rem;
  font-weight: 800;
  color: white;
  line-height: 1;
  margin-bottom: 0.25rem;
}
.hero-stat .label { font-size: 0.8125rem; color: rgba(255,255,255,.6); }

/* ── TAGS / BADGES ────────────────────────────────────────────────── */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.625rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border: 1px solid #bfdbfe;
  white-space: nowrap;
  letter-spacing: .01em;
}
.tag.purple { background: var(--color-secondary-light); color: #5b21b6; border-color: #ddd6fe; }
.tag.cyan   { background: #ecfeff; color: #0e7490; border-color: #a5f3fc; }
.tag.green  { background: #ecfdf5; color: #065f46; border-color: #a7f3d0; }
.tag.orange { background: #fff7ed; color: #92400e; border-color: #fed7aa; }

.read-time {
  font-size: 0.75rem;
  color: var(--color-gray-500);
  font-weight: 500;
  white-space: nowrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.625rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* ── SECTION HEADERS ──────────────────────────────────────────────── */
.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-header .eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}
.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}
.section-header h2 { margin-bottom: 1rem; }
.section-header p {
  font-size: 1.0625rem;
  color: var(--color-gray-600);
  max-width: 580px;
  margin: 0 auto;
}

/* ── CARDS (generic) ──────────────────────────────────────────────── */
.card {
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: box-shadow var(--t-base), transform var(--t-base), border-color var(--t-base);
  position: relative;
}
.card:hover {
  border-color: #bfdbfe;
  box-shadow: 0 8px 32px rgba(29,78,216,.10), 0 2px 8px rgba(29,78,216,.06);
  transform: translateY(-3px);
}
.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.375rem;
  margin-bottom: 1.125rem;
  flex-shrink: 0;
}
.card-icon.blue   { background: var(--color-primary-light); }
.card-icon.purple { background: var(--color-secondary-light); }
.card-icon.cyan   { background: #ecfeff; }
.card-icon.green  { background: #ecfdf5; }
.card-icon.orange { background: #fff7ed; }
.card-icon.rose   { background: #fff1f2; }
.card h3 { margin-bottom: 0.625rem; font-size: 1.0625rem; }
.card p  { font-size: 0.9rem; margin-bottom: 0; color: var(--color-gray-600); }

/* ── ARTICLE CARDS ────────────────────────────────────────────────── */
.card-article {
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 1px 4px rgba(15,23,42,.05), 0 4px 16px rgba(15,23,42,.05);
  transition: box-shadow var(--t-base), transform var(--t-base), border-color var(--t-base);
  position: relative;
}
.card-article::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  opacity: 0;
  transition: opacity var(--t-base);
}
.card-article:hover {
  box-shadow: 0 8px 32px rgba(29,78,216,.12), 0 2px 8px rgba(29,78,216,.06);
  transform: translateY(-4px);
  border-color: #bfdbfe;
}
.card-article:hover::after { opacity: 1; }

.card-article-image {
  height: 148px;
  background: linear-gradient(135deg, var(--color-primary-light), #e0f2fe);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.75rem;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}
.card-article-image::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 70% 30%, rgba(255,255,255,.65), transparent 70%);
}

.card-article-body {
  padding: 1.25rem 1.375rem 1rem;
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 0.5rem;
}

.card-article-meta {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  flex-wrap: wrap;
}

.card-article h2, .card-article h3 {
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0;
  letter-spacing: -0.01em;
  color: var(--color-gray-900);
}
.card-article h2 a, .card-article h3 a { color: var(--color-gray-900); }
.card-article h2 a:hover, .card-article h3 a:hover { color: var(--color-primary); }

.card-article p {
  font-size: 0.875rem;
  color: var(--color-gray-600);
  line-height: 1.65;
  margin-bottom: 0;
  flex: 1;
}

.card-article-footer {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding-top: 0.875rem;
  border-top: 1px solid var(--color-gray-100);
  margin-top: auto;
}

.author-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.6875rem;
  font-weight: 700;
  flex-shrink: 0;
  font-family: var(--font-display);
}

.author-info .name { font-size: 0.8125rem; font-weight: 600; color: var(--color-gray-900); line-height: 1.3; }
.author-info .date { font-size: 0.75rem; color: var(--color-gray-500); line-height: 1.3; }

/* ── TOOL CARDS ───────────────────────────────────────────────────── */
.tool-card {
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: 1.875rem;
  transition: box-shadow var(--t-base), transform var(--t-base), border-color var(--t-base);
  position: relative;
  overflow: hidden;
}
.tool-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}
.tool-card:hover {
  border-color: #bfdbfe;
  box-shadow: 0 8px 32px rgba(29,78,216,.12), 0 2px 8px rgba(29,78,216,.06);
  transform: translateY(-4px);
}
.tool-card .icon, .tool-card .tool-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary-light), #e0f2fe);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.625rem;
  margin: 0 auto 1.125rem;
}
.tool-card:not([style*="text-align"]) .icon,
.tool-card:not([style*="text-align"]) .tool-icon { margin: 0 0 1.125rem; }
.tool-card h3 { margin-bottom: 0.5rem; font-size: 1rem; }
.tool-card p  { font-size: 0.875rem; color: var(--color-gray-600); margin-bottom: 1.25rem; }

/* ── BENEFITS ─────────────────────────────────────────────────────── */
.benefits-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.25rem; }
.benefit-item {
  display: flex;
  gap: 1rem;
  padding: 1.5rem;
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--t-base), transform var(--t-base);
}
.benefit-item:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.benefit-item .icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
}
.benefit-item h4 { font-size: 0.9375rem; margin-bottom: 0.25rem; }
.benefit-item p  { font-size: 0.85rem; margin-bottom: 0; color: var(--color-gray-600); }

/* ── CATEGORY CARDS ───────────────────────────────────────────────── */
.category-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  padding: 2rem 1.75rem;
  cursor: pointer;
  text-decoration: none;
  display: block;
  transition: transform var(--t-base), box-shadow var(--t-base);
}
.category-card::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, transparent 40%, rgba(0,0,0,.25));
}
.category-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-xl); }
.category-card .cat-icon { font-size: 2.5rem; margin-bottom: 1rem; display: block; position: relative; z-index: 1; }
.category-card h3 { color: white; margin-bottom: 0.375rem; font-size: 1.125rem; position: relative; z-index: 1; }
.category-card p   { color: rgba(255,255,255,.8); font-size: 0.875rem; margin-bottom: 0.75rem; position: relative; z-index: 1; }
.category-card .count { color: rgba(255,255,255,.7); font-size: 0.8125rem; font-weight: 600; position: relative; z-index: 1; }
.cat-blue   { background: linear-gradient(135deg, #1d4ed8, #7c3aed); }
.cat-cyan   { background: linear-gradient(135deg, #0369a1, #2563eb); }
.cat-green  { background: linear-gradient(135deg, #065f46, #0891b2); }
.cat-orange { background: linear-gradient(135deg, #b45309, #dc2626); }
.cat-purple { background: linear-gradient(135deg, #6d28d9, #db2777); }

/* ── FAQ ──────────────────────────────────────────────────────────── */
.faq-list { max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: 0.625rem; }

.faq-item {
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.faq-item.open {
  border-color: #bfdbfe;
  box-shadow: 0 2px 12px rgba(29,78,216,.08);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 1.125rem 1.25rem;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-gray-800);
  transition: background var(--transition), color var(--transition);
}
.faq-question:hover { background: var(--color-gray-50); color: var(--color-primary); }
.faq-item.open .faq-question { background: var(--color-primary-light); color: var(--color-primary); }

.faq-question .toggle {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--color-gray-100);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  transition: all var(--transition);
}
.faq-item.open .faq-question .toggle {
  background: var(--color-primary);
  color: white;
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 380ms var(--ease-out);
}
.faq-item.open .faq-answer { max-height: 600px; }

.faq-answer-inner,
.faq-answer > div {
  padding: 0 1.25rem 1.25rem;
  font-size: 0.9375rem;
  color: var(--color-gray-700);
  line-height: 1.75;
}
.faq-answer p { font-size: 0.9rem; color: var(--color-gray-600); line-height: 1.75; margin-bottom: 0; }
.faq-answer a { color: var(--color-primary); text-decoration: underline; }

/* ── CTA BLOCK ────────────────────────────────────────────────────── */
.cta-block {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary), #7c3aed);
  border-radius: var(--radius-xl);
  padding: 4rem 3rem;
  text-align: center;
  color: white;
  position: relative;
  overflow: hidden;
}
.cta-block::before {
  content: '';
  position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='20' cy='20' r='1.2' fill='%23ffffff' fill-opacity='0.06'/%3E%3C/svg%3E");
}
.cta-block h2 { color: white; margin-bottom: 1rem; position: relative; }
.cta-block p  { color: rgba(255,255,255,.82); font-size: 1.0625rem; margin-bottom: 2rem; position: relative; }

/* ── BREADCRUMBS ──────────────────────────────────────────────────── */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--color-gray-500);
  list-style: none;
  padding: 1rem 0;
  padding-left: 0;
}
.breadcrumbs li::after { content: '/'; margin-left: 0.25rem; color: var(--color-gray-400); }
.breadcrumbs li:last-child::after { content: ''; }
.breadcrumbs a { color: var(--color-gray-500); }
.breadcrumbs a:hover { color: var(--color-primary); }
.breadcrumbs li:last-child { color: var(--color-gray-700); font-weight: 500; }

/* ── ARTICLE HEADER ───────────────────────────────────────────────── */
.article-header {
  padding: 3rem 0 2rem;
  background: linear-gradient(135deg, #f0f9ff, #eff6ff);
  border-bottom: 1px solid var(--color-gray-200);
}

.article-category-tag,
.article-category-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border: 1px solid #bfdbfe;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.article-title, .article-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.18;
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
}

.article-excerpt, .article-lead {
  font-size: 1.125rem;
  color: var(--color-gray-600);
  line-height: 1.7;
  margin-bottom: 1.5rem;
  max-width: 72ch;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
}
.article-meta-bar .author-block {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.author-avatar-lg {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex; align-items: center; justify-content: center;
  color: white; font-weight: 700; font-size: 0.9375rem;
  flex-shrink: 0;
}
.article-meta-bar .author-name,
.article-author { font-weight: 600; font-size: 0.875rem; color: var(--color-gray-900); }
.article-meta-bar .author-name a,
.article-author a { color: var(--color-primary); }
.article-meta-bar .dates,
.article-dates { font-size: 0.8rem; color: var(--color-gray-500); margin-top: 0.1rem; }
.meta-divider { color: var(--color-gray-300); }
.article-meta-info { flex: 1; min-width: 0; }

.read-time-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border: 1px solid #bfdbfe;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
}

/* ── ARTICLE LAYOUT (two-column) ──────────────────────────────────── */
.article-layout, .content-with-sidebar {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 3rem;
  align-items: start;
  padding: 3rem 0;
}

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

/* Article body typography */
.article-body, .article-content {
  max-width: 100%;
}
.article-body h2, .article-content h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #dbeafe;
  color: var(--color-gray-900);
}
.article-body h3, .article-content h3 {
  font-size: 1.1875rem;
  margin: 2rem 0 0.75rem;
  color: var(--color-gray-800);
}
.article-body p, .article-content > p {
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 1.375rem;
  color: var(--color-gray-700);
  max-width: 72ch;
}
.article-body ul, .article-body ol,
.article-content ul, .article-content ol { margin-bottom: 1.375rem; }
.article-body li, .article-content li {
  font-size: 1.0625rem;
  line-height: 1.75;
  margin-bottom: 0.5rem;
  color: var(--color-gray-700);
}
.article-body strong, .article-content strong { color: var(--color-gray-900); font-weight: 700; }

.article-body a, .article-content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: #bfdbfe;
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition);
}
.article-body a:hover, .article-content a:hover {
  text-decoration-color: var(--color-primary);
}

.article-body blockquote {
  border-left: 4px solid var(--color-primary);
  padding: 1rem 1.5rem;
  background: var(--color-primary-light);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--color-gray-700);
}
.article-body .callout {
  background: var(--color-primary-light);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  display: flex;
  gap: 0.875rem;
}
.article-body .callout .callout-icon { font-size: 1.25rem; flex-shrink: 0; }
.article-body .callout p { margin-bottom: 0; font-size: 0.9375rem; }

.article-body table, .article-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 1.75rem 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-gray-200);
}
.article-body table th, .article-content table th {
  background: var(--color-gray-50);
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--color-gray-700);
  border-bottom: 1px solid var(--color-gray-200);
}
.article-body table td, .article-content table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-gray-100);
  color: var(--color-gray-700);
}
.article-body table tr:last-child td, .article-content table tr:last-child td { border-bottom: none; }
.article-body table tr:hover td, .article-content table tr:hover td { background: var(--color-gray-50); }

/* Legacy article wrapper */
.article-content { padding-top: 0; }

/* ── SIDEBAR ──────────────────────────────────────────────────────── */
.sidebar, .article-sidebar {
  position: sticky;
  top: 84px;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--color-gray-200) transparent;
}
.sidebar::-webkit-scrollbar { width: 3px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--color-gray-300); border-radius: 3px; }

.sidebar-widget {
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: 1.25rem;
}
.sidebar-widget h4 {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--color-gray-500);
  margin-bottom: 0.875rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-gray-100);
}

/* TOC */
.toc-list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 0.125rem; }
.toc-list li { margin-bottom: 0; }
.toc-list a, .toc-list li a {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-gray-600);
  padding: 0.375rem 0.625rem;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all var(--transition);
  line-height: 1.4;
}
.toc-list a:hover { color: var(--color-primary); background: var(--color-primary-light); border-left-color: #93c5fd; }
.toc-list a.active { color: var(--color-primary); background: var(--color-primary-light); border-left-color: var(--color-primary); font-weight: 600; }
.toc-list .toc-h3, .toc-list li.toc-h3 { padding-left: 1rem; }
.toc-list .toc-h3 a { font-size: 0.75rem; }

/* Related list */
.related-list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 0.125rem; }
.related-list li a {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-gray-700);
  padding: 0.5rem 0.625rem;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all var(--transition);
  line-height: 1.4;
}
.related-list li a:hover { color: var(--color-primary); background: var(--color-primary-light); border-left-color: var(--color-primary); }

/* ── TOOL PAGE ────────────────────────────────────────────────────── */
.tool-header {
  background: linear-gradient(135deg, #0c1a47, #1e3a8a);
  padding: 4rem 0 3rem;
}
.tool-header h1 { color: white; margin-bottom: 1rem; }
.tool-header p   { color: rgba(255,255,255,.78); font-size: 1.0625rem; max-width: 650px; }

.tool-workspace {
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.tool-tabs {
  display: flex;
  gap: 0.25rem;
  background: var(--color-gray-50);
  border-bottom: 1px solid var(--color-gray-200);
  padding: 0.5rem 0.5rem 0;
  overflow-x: auto;
}

.tool-tab {
  padding: 0.5625rem 1.125rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-gray-600);
  cursor: pointer;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  border: 1px solid transparent;
  border-bottom: none;
  white-space: nowrap;
  background: transparent;
  transition: all var(--transition);
  font-family: var(--font-sans);
  margin-bottom: -1px;
}
.tool-tab.active {
  color: var(--color-primary);
  background: white;
  border-color: var(--color-gray-200);
  border-bottom-color: white;
}
.tool-tab:hover { color: var(--color-primary); background: white; }

.tool-panel { display: none; padding: 1.75rem; }
.tool-panel.active { display: block; }

/* Forms */
.form-group { margin-bottom: 1.125rem; }
.form-label, .form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-gray-700);
  margin-bottom: 0.4rem;
}
.form-control,
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.6875rem 0.9375rem;
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-family: var(--font-sans);
  color: var(--color-gray-900);
  background: var(--color-gray-50);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  -webkit-appearance: none;
  appearance: none;
}
.form-control:focus,
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #93c5fd;
  background: white;
  box-shadow: 0 0 0 3px rgba(29,78,216,.10);
}
textarea.form-control, .form-group textarea { resize: vertical; min-height: 120px; line-height: 1.6; }
select.form-control, .form-group select { cursor: pointer; }

.output-block, .tool-output {
  background: var(--color-gray-50);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  min-height: 150px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--color-gray-700);
  white-space: pre-wrap;
  font-family: var(--font-sans);
  transition: border-color var(--transition);
}
.output-actions { display: flex; gap: 0.75rem; margin-top: 1rem; flex-wrap: wrap; }

/* Task organizer */
.task-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-gray-300);
  transition: all var(--transition);
}
.task-item.priority-alta  { border-left-color: #ef4444; }
.task-item.priority-media { border-left-color: #f59e0b; }
.task-item.priority-baja  { border-left-color: #10b981; }
.task-item.done { opacity: .5; }
.task-check { display: flex; align-items: center; gap: 0.75rem; flex: 1; cursor: pointer; }
.task-check span { font-size: 0.9rem; color: var(--color-gray-800); }
.task-item.done .task-check span { text-decoration: line-through; }
.task-meta { display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0; }
.badge-alta  { background: #fee2e2; color: #dc2626; }
.badge-media { background: #fef3c7; color: #b45309; }
.badge-baja  { background: #d1fae5; color: #065f46; }
.btn-icon {
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  background: none; border: none; cursor: pointer;
  color: var(--color-gray-400);
  font-size: 1rem;
  transition: all var(--transition);
}
.btn-icon:hover { background: #fee2e2; color: #dc2626; }

/* ── BACK TO TOP ──────────────────────────────────────────────────── */
.back-to-top {
  position: fixed;
  bottom: 2rem; right: 2rem;
  width: 44px; height: 44px;
  background: white;
  border: 1.5px solid var(--color-gray-200);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-md);
  color: var(--color-gray-600);
  font-size: 1.125rem;
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity var(--t-base), transform var(--t-base), box-shadow var(--transition), color var(--transition);
  z-index: 90;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover {
  color: var(--color-primary);
  border-color: #93c5fd;
  box-shadow: var(--shadow-lg);
}

/* ── FOOTER ───────────────────────────────────────────────────────── */
.site-footer {
  background: var(--color-dark);
  color: rgba(255,255,255,.65);
  padding: 4.5rem 0 2rem;
  margin-top: 4rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255,255,255,.07);
  margin-bottom: 2rem;
}
.footer-brand .logo {
  color: white;
  font-size: 1.125rem;
  font-weight: 800;
  font-family: var(--font-display);
  margin-bottom: 0.75rem;
  display: flex; align-items: center; gap: 0.375rem;
}
.footer-brand .logo span { color: #38bdf8; }
.footer-brand .logo .logo-icon { width: 20px; height: 20px; border-radius: 5px; }
.footer-brand p { font-size: 0.875rem; line-height: 1.7; margin-bottom: 0; color: rgba(255,255,255,.45); max-width: 26ch; }
.footer-col h5 {
  color: rgba(255,255,255,.45);
  font-size: 0.725rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}
.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: 0.5rem; }
.footer-col a { font-size: 0.875rem; color: rgba(255,255,255,.55); transition: color var(--transition); }
.footer-col a:hover { color: white; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8125rem;
  color: rgba(255,255,255,.35);
}
.footer-bottom a { color: rgba(255,255,255,.45); }
.footer-bottom a:hover { color: white; }

/* ── AD SLOTS ─────────────────────────────────────────────────────── */
.ad-slot {
  background: var(--color-gray-50);
  border: 1.5px dashed var(--color-gray-200);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-400);
  font-size: 0.725rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  overflow: hidden;
}
.ad-slot-banner      { height: 90px; width: 100%; margin-bottom: 2rem; }
.ad-slot-rectangle   { height: 250px; width: 100%; }
.ad-slot-leaderboard { height: 90px; width: 100%; }

/* ── FEATURED ARTICLE ─────────────────────────────────────────────── */
.featured-article { grid-template-columns: 1fr auto; }

/* ── UTILITIES ────────────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-sm  { font-size: 0.875rem; }
.text-xs  { font-size: 0.75rem; }
.font-bold { font-weight: 700; }
.text-muted { color: var(--color-gray-500); }
.text-primary { color: var(--color-primary); }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mt-4 { margin-top: 2rem; }
.mt-6 { margin-top: 3rem; }
.bg-light { background: var(--color-gray-50); }
.bg-dark  { background: var(--color-dark); }
.divider  { height: 1px; background: var(--color-gray-200); margin: 2rem 0; }
.sr-only  { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* Selection */
::selection { background: #dbeafe; color: #1e3a8a; }

/* Focus visible */
:focus-visible { outline: 2px solid #60a5fa; outline-offset: 3px; border-radius: var(--radius-sm); }

/* Custom scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-gray-300); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-gray-400); }

/* ── RESPONSIVE ───────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .article-layout, .content-with-sidebar {
    grid-template-columns: 1fr;
    padding: 2rem 0;
  }
  .sidebar, .article-sidebar { position: static; max-height: none; overflow: visible; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --section-py: 3.5rem; }
  .section { padding: 3.5rem 0; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .hero { padding: 4rem 0 3rem; }
  .hero-stats { gap: 2rem; }
  .cta-block { padding: 2.5rem 1.5rem; }
  .nav-menu, .nav-actions { display: none; }
  .nav-toggle { display: flex; }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: white;
    border-bottom: 1px solid var(--color-gray-200);
    padding: 1rem 1.5rem 1.5rem;
    gap: 0.25rem;
    box-shadow: var(--shadow-lg);
    z-index: 99;
    height: auto;
  }
  .nav-menu.open > li { height: auto; }
  .nav-menu.open > li > a { padding: 0.625rem 0.75rem; border-radius: var(--radius-md); }
  .nav-dropdown .dropdown-menu {
    position: static;
    transform: none;
    box-shadow: none;
    border: none;
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    opacity: 1;
    pointer-events: auto;
    padding: 0.375rem;
    margin-top: 0.25rem;
    display: none;
  }
  .nav-dropdown.open .dropdown-menu { display: block; }
  .grid-4 { grid-template-columns: 1fr; }
  .ad-slot-banner { height: 60px; }
  .back-to-top { bottom: 1.25rem; right: 1.25rem; }
  .article-meta-bar { flex-direction: column; align-items: flex-start; }
  .featured-article { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: center; }
  .btn-lg { width: 100%; justify-content: center; }
}

@media print {
  .site-header, .site-footer, .ad-slot, .sidebar, .article-sidebar,
  .back-to-top, .progress-bar { display: none !important; }
  .article-layout, .content-with-sidebar { grid-template-columns: 1fr; }
  body { background: white; }
}