/* ============================================
   MatchingLoving - Warm Romantic Design System
   ============================================ */

/* --- CSS Variables --- */
:root {
  --dark: #0a0608;
  --dark-card: #150e12;
  --dark-border: #2a1a22;
  --primary: #f43f5e;
  --primary-light: #fb7185;
  --primary-dark: #be123c;
  --secondary: #fb923c;
  --secondary-light: #fdba74;
  --accent: #fbbf24;
  --accent-light: #fde68a;
  --text-main: #f5e6ea;
  --text-muted: #c9a8b3;
  --text-dark: #0a0608;
  --gradient-rose: linear-gradient(135deg, #f43f5e 0%, #fb923c 100%);
  --gradient-sunset: linear-gradient(135deg, #be123c 0%, #f43f5e 40%, #fb923c 80%, #fbbf24 100%);
  --gradient-warm-soft: linear-gradient(135deg, rgba(244,63,94,0.15) 0%, rgba(251,146,60,0.10) 100%);
  --gradient-card: linear-gradient(160deg, #1a0f14 0%, #150e12 100%);
  --shadow-rose: 0 4px 30px rgba(244,63,94,0.15);
  --shadow-warm: 0 8px 40px rgba(244,63,94,0.10), 0 4px 20px rgba(251,146,60,0.08);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: 'Nunito', sans-serif;
  background-color: var(--dark);
  color: var(--text-main);
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: 'Playfair Display', serif;
  color: var(--text-main);
  line-height: 1.25;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 4vw, 2.4rem); }
h3 { font-size: clamp(1.3rem, 3vw, 1.8rem); }
h4 { font-size: clamp(1.1rem, 2.5vw, 1.4rem); }

p {
  margin-bottom: 1.2rem;
  color: var(--text-muted);
}

ul, ol {
  margin-bottom: 1.2rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-narrow {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Header / Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 6, 8, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--dark-border);
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 6, 8, 0.95);
  box-shadow: var(--shadow-rose);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.navbar-brand {
  font-family: 'Playfair Display', serif;
  font-size: 1.6rem;
  font-weight: 700;
  background: var(--gradient-rose);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.navbar-brand .heart-icon {
  width: 28px;
  height: 28px;
  fill: var(--primary);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-rose);
  transition: width var(--transition);
  border-radius: 2px;
}

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

.nav-links a:hover::after {
  width: 100%;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.mobile-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 1.5rem 80px;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 20%, rgba(244,63,94,0.12) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 80%, rgba(251,146,60,0.08) 0%, transparent 50%),
              radial-gradient(ellipse at 50% 50%, rgba(251,191,36,0.05) 0%, transparent 40%);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 780px;
}

.hero-badge {
  display: inline-block;
  padding: 0.4rem 1.2rem;
  background: rgba(244,63,94,0.12);
  border: 1px solid rgba(244,63,94,0.25);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary-light);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero h1 {
  margin-bottom: 1.5rem;
  line-height: 1.15;
}

.hero h1 .gradient-text {
  background: var(--gradient-sunset);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
}

/* Floating hearts animation */
.floating-hearts {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.floating-heart {
  position: absolute;
  opacity: 0;
  animation: floatHeart 8s ease-in-out infinite;
}

.floating-heart svg {
  fill: var(--primary);
  opacity: 0.08;
}

@keyframes floatHeart {
  0% { transform: translateY(100vh) rotate(0deg) scale(0.5); opacity: 0; }
  20% { opacity: 0.08; }
  80% { opacity: 0.04; }
  100% { transform: translateY(-10vh) rotate(45deg) scale(1.2); opacity: 0; }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 2rem;
  font-family: 'Nunito', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-rose);
  color: #fff;
  box-shadow: 0 4px 20px rgba(244,63,94,0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(244,63,94,0.4);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--dark-border);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(244,63,94,0.05);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent) 0%, var(--secondary) 100%);
  color: var(--text-dark);
  font-weight: 800;
  box-shadow: 0 4px 20px rgba(251,191,36,0.3);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(251,191,36,0.4);
  color: var(--text-dark);
}

.btn-lg {
  padding: 1.1rem 2.8rem;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

/* --- Cards --- */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-rose);
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-warm);
  border-color: rgba(244,63,94,0.2);
}

.card:hover::before {
  opacity: 1;
}

.card-image {
  width: 100%;
  height: 200px;
  background: var(--gradient-warm-soft);
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.card-image svg {
  width: 60px;
  height: 60px;
  fill: var(--primary);
  opacity: 0.4;
}

.card-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: rgba(244,63,94,0.1);
  border: 1px solid rgba(244,63,94,0.2);
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary-light);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.8rem;
}

.card h3 {
  margin-bottom: 0.8rem;
}

.card h3 a {
  color: var(--text-main);
}

.card h3 a:hover {
  color: var(--primary-light);
}

.card p {
  font-size: 0.95rem;
  line-height: 1.7;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1.2rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --- Article Grid --- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

/* --- Section Styles --- */
.section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-header h2 {
  margin-bottom: 1rem;
}

.section-header p {
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.05rem;
}

.section-label {
  display: inline-block;
  font-family: 'Nunito', sans-serif;
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary);
  margin-bottom: 0.8rem;
}

/* --- Features / Stats --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: all var(--transition);
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-rose);
  border-color: rgba(244,63,94,0.2);
}

.feature-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 1.2rem;
  background: rgba(244,63,94,0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  fill: var(--primary);
}

.feature-card h4 {
  margin-bottom: 0.6rem;
}

/* --- CTA Banner --- */
.cta-banner {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-xl);
  padding: 3.5rem 2.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-sunset);
}

.cta-banner::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center bottom, rgba(244,63,94,0.08) 0%, transparent 60%);
  pointer-events: none;
}

.cta-banner h2 {
  position: relative;
  z-index: 1;
  margin-bottom: 1rem;
}

.cta-banner p {
  position: relative;
  z-index: 1;
  max-width: 550px;
  margin: 0 auto 2rem;
  font-size: 1.05rem;
}

.cta-banner .btn {
  position: relative;
  z-index: 1;
}

/* --- Article Page Styles --- */
.article-hero {
  padding: 120px 0 60px;
  text-align: center;
  position: relative;
}

.article-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 30%, rgba(244,63,94,0.1) 0%, transparent 60%);
}

.article-hero .container-narrow {
  position: relative;
  z-index: 1;
}

.article-hero h1 {
  margin-bottom: 1.2rem;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.article-content {
  padding: 0 0 5rem;
}

.article-content h2 {
  margin: 2.5rem 0 1.2rem;
  padding-top: 1rem;
}

.article-content h3 {
  margin: 2rem 0 1rem;
}

.article-content p {
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-content ul,
.article-content ol {
  margin: 1.2rem 0;
  padding-left: 2rem;
}

.article-content li {
  font-size: 1.02rem;
  line-height: 1.8;
  margin-bottom: 0.6rem;
}

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

/* --- Comparison Table --- */
.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--dark-border);
}

.comparison-table thead th {
  background: rgba(244,63,94,0.1);
  padding: 1rem 1.2rem;
  text-align: left;
  font-family: 'Playfair Display', serif;
  font-size: 1rem;
  color: var(--text-main);
  border-bottom: 1px solid var(--dark-border);
}

.comparison-table tbody td {
  padding: 0.9rem 1.2rem;
  border-bottom: 1px solid rgba(42,26,34,0.5);
  font-size: 0.95rem;
  color: var(--text-muted);
}

.comparison-table tbody tr:last-child td {
  border-bottom: none;
}

.comparison-table tbody tr:hover {
  background: rgba(244,63,94,0.03);
}

/* --- Rating / Score Box --- */
.rating-box {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin: 2rem 0;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.rating-score {
  min-width: 70px;
  height: 70px;
  background: var(--gradient-rose);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Playfair Display', serif;
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.rating-info h4 {
  margin-bottom: 0.3rem;
}

.rating-info p {
  margin: 0;
  font-size: 0.95rem;
}

/* --- Pros / Cons --- */
.pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

.pros-box, .cons-box {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.pros-box {
  border-top: 3px solid #22c55e;
}

.cons-box {
  border-top: 3px solid var(--primary);
}

.pros-box h4 {
  color: #22c55e;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.cons-box h4 {
  color: var(--primary);
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.pros-box ul, .cons-box ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.pros-box li::before {
  content: '+ ';
  color: #22c55e;
  font-weight: 700;
}

.cons-box li::before {
  content: '- ';
  color: var(--primary);
  font-weight: 700;
}

/* --- Info Box / Tip --- */
.info-box {
  background: rgba(244,63,94,0.06);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.5rem;
  margin: 2rem 0;
}

.info-box p {
  margin: 0;
  color: var(--text-main);
}

.info-box strong {
  color: var(--primary-light);
}

/* --- App Review Card --- */
.app-review {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin: 2rem 0;
}

.app-review-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.2rem;
}

.app-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-rose);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.app-icon svg {
  width: 28px;
  height: 28px;
  fill: #fff;
}

.app-review-header h3 {
  margin: 0;
}

.app-review-header .app-rating {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
}

/* --- Breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--primary-light);
}

.breadcrumb-sep {
  color: rgba(201,168,179,0.4);
}

/* --- TOC (Table of Contents) --- */
.toc {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  margin: 2rem 0;
}

.toc h4 {
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.toc ol {
  margin: 0;
  padding-left: 1.5rem;
}

.toc li {
  margin-bottom: 0.5rem;
}

.toc a {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.toc a:hover {
  color: var(--primary-light);
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--dark-border);
  padding: 4rem 0 2rem;
  background: rgba(10, 6, 8, 0.6);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand {
  font-family: 'Playfair Display', serif;
  font-size: 1.4rem;
  font-weight: 700;
  background: var(--gradient-rose);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  display: inline-block;
}

.footer-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 320px;
}

.footer h4 {
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--text-main);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--primary-light);
}

.footer-bottom {
  border-top: 1px solid var(--dark-border);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: var(--gradient-rose);
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-rose);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(244,63,94,0.4);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
  fill: #fff;
}

/* --- Related Articles --- */
.related-articles {
  padding: 4rem 0;
  border-top: 1px solid var(--dark-border);
}

.related-articles h2 {
  text-align: center;
  margin-bottom: 2.5rem;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 6, 8, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 2.5rem;
    padding: 2rem;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links a {
    font-size: 1.3rem;
  }

  .mobile-toggle {
    display: flex;
  }

  .mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .mobile-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    min-height: 80vh;
    padding: 100px 1.5rem 60px;
  }

  .articles-grid {
    grid-template-columns: 1fr;
  }

  .pros-cons {
    grid-template-columns: 1fr;
  }

  .rating-box {
    flex-direction: column;
    text-align: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .cta-banner {
    padding: 2.5rem 1.5rem;
  }

  .comparison-table {
    font-size: 0.85rem;
  }

  .comparison-table thead th,
  .comparison-table tbody td {
    padding: 0.7rem 0.8rem;
  }

  .app-review-header {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .section {
    padding: 3.5rem 0;
  }

  .card {
    padding: 1.5rem;
  }

  .btn-lg {
    padding: 0.9rem 2rem;
    font-size: 1rem;
  }
}

/* --- Utility --- */
.text-center { text-align: center; }
.text-gradient {
  background: var(--gradient-rose);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }