/* ============================================
   随行付智能POS - 深银青闪营风格
   ============================================ */

/* CSS Variables */
:root {
  --vsp-silver: #1E2A33;
  --flash-cyan: #06B6D4;
  --direct-gold: #F59E0B;
  --vsp-silver-light: #2E3A43;
  --bg-page: #EDF0F2;
  --text-dark: #0A0E15;
  --text-body: #334155;
  --text-light: #64748B;
  --white: #FFFFFF;
  --shadow-sm: 0 1px 2px rgba(30, 42, 51, 0.05);
  --shadow-md: 0 4px 6px rgba(30, 42, 51, 0.07);
  --shadow-lg: 0 10px 15px rgba(30, 42, 51, 0.1);
  --shadow-xl: 0 20px 25px rgba(30, 42, 51, 0.15);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-page);
  color: var(--text-body);
  line-height: 1.7;
  font-size: 16px;
}

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

a {
  text-decoration: none;
  color: inherit;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul {
  list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.3;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: 1.25rem; }

.font-dm {
  font-family: 'DM Sans', 'Noto Sans SC', sans-serif;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--white);
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(30, 42, 51, 0.15);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--vsp-silver);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--vsp-silver), var(--vsp-silver-light));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-weight: 500;
  color: var(--text-body);
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--flash-cyan);
}

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

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

.nav-cta {
  background: linear-gradient(135deg, var(--flash-cyan), #0891b2);
  color: var(--white) !important;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: var(--transition);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.4);
}

.nav-cta::after {
  display: none !important;
}

/* Mobile Menu */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--vsp-silver);
  transition: var(--transition);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: var(--white);
  padding: 20px;
  box-shadow: var(--shadow-lg);
}

.mobile-nav.active {
  display: block;
}

.mobile-nav a {
  display: block;
  padding: 12px 0;
  border-bottom: 1px solid #eee;
  color: var(--text-body);
  font-weight: 500;
}

.mobile-nav .nav-cta {
  margin-top: 16px;
  text-align: center;
  border-radius: var(--radius-md);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .menu-toggle {
    display: flex;
  }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  padding: 160px 0 100px;
  background: linear-gradient(135deg, var(--vsp-silver) 0%, var(--vsp-silver-light) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 20%, rgba(6, 182, 212, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(245, 158, 11, 0.1) 0%, transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero-tag {
  display: inline-block;
  background: rgba(6, 182, 212, 0.15);
  color: var(--flash-cyan);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 20px;
  animation: fadeInDown 0.8s ease;
}

.hero h1 {
  color: var(--white);
  margin-bottom: 20px;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-subtitle {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.25rem;
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.6s both;
}

.btn-primary {
  background: linear-gradient(135deg, var(--flash-cyan), #0891b2);
  color: var(--white);
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(6, 182, 212, 0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--white);
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid rgba(255, 255, 255, 0.5);
  transition: var(--transition);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--white);
}

/* Hero Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-header h2 {
  margin-bottom: 16px;
}

.section-header p {
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

.bg-white {
  background: var(--white);
}

/* ============================================
   闪营板块 (Flash + Direct Section)
   ============================================ */
.flash-direct {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.flash-direct-image {
  background: linear-gradient(135deg, var(--flash-cyan), #0891b2);
  border-radius: var(--radius-lg);
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.25rem;
  position: relative;
  overflow: hidden;
}

.flash-direct-image::before {
  content: '';
  position: absolute;
  width: 200px;
  height: 200px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  top: -50px;
  right: -50px;
}

.flash-direct-image::after {
  content: '';
  position: absolute;
  width: 150px;
  height: 150px;
  background: rgba(245, 158, 11, 0.2);
  border-radius: 50%;
  bottom: -30px;
  left: -30px;
}

.flash-direct-content h2 {
  margin-bottom: 24px;
}

.flash-direct-content p {
  font-size: 1.125rem;
  margin-bottom: 24px;
}

.flash-highlight {
  color: var(--flash-cyan);
  font-weight: 700;
}

.gold-highlight {
  color: var(--direct-gold);
  font-weight: 700;
}

@media (max-width: 768px) {
  .flash-direct {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .flash-direct-image {
    height: 280px;
  }
}

/* ============================================
   Flash Pay Cards Section
   ============================================ */
.flash-cards {
  display: grid;
  grid-template-columns: 55% 43%;
  gap: 30px;
}

.flash-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.flash-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.flash-card-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--flash-cyan), #0891b2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.flash-card-icon svg {
  width: 30px;
  height: 30px;
  color: var(--white);
}

.flash-card h3 {
  margin-bottom: 12px;
}

.flash-card p {
  color: var(--text-light);
  margin-bottom: 20px;
}

.flash-card .number {
  font-family: 'DM Sans', sans-serif;
  font-size: 3rem;
  font-weight: 700;
  color: var(--flash-cyan);
  line-height: 1;
}

.flash-card .unit {
  color: var(--text-light);
  font-size: 1rem;
  margin-left: 8px;
}

/* Inner cards grid for first card */
.flash-card-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.flash-card-inner .inner-item h4 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.flash-card-inner .inner-item p {
  font-size: 0.875rem;
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .flash-cards {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Official Direct Section
   ============================================ */
.direct-section {
  background: var(--white);
}

.direct-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 50px;
}

.direct-item {
  text-align: center;
  padding: 30px;
}

.direct-item .icon {
  width: 70px;
  height: 70px;
  background: linear-gradient(135deg, var(--direct-gold), #d97706);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.direct-item .icon svg {
  width: 32px;
  height: 32px;
  color: var(--white);
}

.direct-item h3 {
  margin-bottom: 12px;
  font-size: 1.25rem;
}

.direct-item p {
  color: var(--text-light);
  font-size: 0.9375rem;
}

.direct-promise {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.05));
  border: 2px solid rgba(245, 158, 11, 0.2);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
}

.direct-promise h3 {
  font-size: 1.5rem;
  margin-bottom: 24px;
  color: var(--direct-gold);
}

.direct-promise-list {
  display: flex;
  gap: 40px;
  justify-content: center;
  flex-wrap: wrap;
}

.direct-promise-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--vsp-silver);
}

.direct-promise-item svg {
  width: 24px;
  height: 24px;
  color: var(--direct-gold);
}

.direct-cta {
  margin-top: 30px;
}

.btn-gold {
  background: linear-gradient(135deg, var(--direct-gold), #d97706);
  color: var(--white);
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(245, 158, 11, 0.4);
}

@media (max-width: 768px) {
  .direct-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Comparison Table
   ============================================ */
.comparison-table {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.comparison-table table {
  width: 100%;
  border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
  padding: 20px 24px;
  text-align: left;
  border-bottom: 1px solid #eee;
}

.comparison-table th {
  background: var(--vsp-silver);
  color: var(--white);
  font-weight: 600;
  font-size: 1rem;
}

.comparison-table th:first-child {
  width: 180px;
}

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

.comparison-table tr:hover td {
  background: rgba(6, 182, 212, 0.05);
}

.check-icon {
  color: var(--flash-cyan);
  font-weight: 700;
  font-size: 1.25rem;
}

.cross-icon {
  color: #DC2626;
  font-size: 1.25rem;
}

@media (max-width: 768px) {
  .comparison-table {
    overflow-x: auto;
  }
  
  .comparison-table table {
    min-width: 600px;
  }
}

/* ============================================
   FAQ Section
   ============================================ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dark);
  text-align: left;
  transition: var(--transition);
}

.faq-question:hover {
  color: var(--flash-cyan);
}

.faq-icon {
  width: 24px;
  height: 24px;
  transition: var(--transition);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 200px;
}

.faq-answer-content {
  padding: 0 24px 20px;
  color: var(--text-light);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  background: linear-gradient(135deg, var(--vsp-silver) 0%, var(--vsp-silver-light) 100%);
  padding: 80px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.1) 0%, transparent 60%);
}

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

.cta-section h2 {
  color: var(--white);
  margin-bottom: 16px;
}

.cta-section p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.125rem;
  margin-bottom: 32px;
}

.cta-highlight {
  color: var(--flash-cyan);
  font-weight: 700;
}

/* ============================================
   Page Hero (Inner Pages)
   ============================================ */
.page-hero {
  padding: 140px 0 80px;
  text-align: center;
  position: relative;
}

.page-hero.flash-bg {
  background: linear-gradient(135deg, var(--flash-cyan), #0891b2);
}

.page-hero.gold-bg {
  background: linear-gradient(135deg, var(--direct-gold), #d97706);
}

.page-hero.silver-bg {
  background: linear-gradient(135deg, var(--vsp-silver), var(--vsp-silver-light));
}

.page-hero h1 {
  color: var(--white);
  margin-bottom: 16px;
}

.page-hero p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Feature Cards (Asymmetric Layout)
   ============================================ */
.feature-grid {
  display: grid;
  gap: 30px;
}

.feature-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

.feature-card:first-child {
  grid-column: span 2;
}

.feature-card .card-tag {
  display: inline-block;
  background: rgba(6, 182, 212, 0.1);
  color: var(--flash-cyan);
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.feature-card.gold-card .card-tag {
  background: rgba(245, 158, 11, 0.1);
  color: var(--direct-gold);
}

.feature-card h3 {
  margin-bottom: 16px;
}

.feature-card p {
  color: var(--text-light);
  margin-bottom: 20px;
}

.feature-card .big-number {
  font-family: 'DM Sans', sans-serif;
  font-size: 4rem;
  font-weight: 700;
  color: var(--flash-cyan);
  line-height: 1;
}

.feature-card.gold-card .big-number {
  color: var(--direct-gold);
}

.feature-three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.feature-block {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
  text-align: center;
}

.feature-block h3 {
  margin-bottom: 12px;
}

.feature-block p {
  color: var(--text-light);
}

@media (max-width: 992px) {
  .feature-card:first-child {
    grid-column: span 1;
  }
  
  .feature-three-col {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .feature-card:first-child {
    grid-column: span 1;
  }
}

/* Colored Feature Block */
.feature-colored {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.1), rgba(6, 182, 212, 0.05));
  border: 2px solid rgba(6, 182, 212, 0.2);
}

/* ============================================
   Direct Sales Section Layout
   ============================================ */
.direct-features {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: center;
}

.direct-features-content h2 {
  margin-bottom: 24px;
}

.direct-features-content p {
  font-size: 1.125rem;
  margin-bottom: 20px;
}

.direct-features-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.direct-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.direct-feature-item .num {
  font-family: 'DM Sans', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--direct-gold);
  line-height: 1;
}

.direct-feature-item h4 {
  font-size: 1.125rem;
  margin-bottom: 4px;
}

.direct-feature-item p {
  font-size: 0.9375rem;
  color: var(--text-light);
  margin-bottom: 0;
}

.direct-features-image {
  background: linear-gradient(135deg, var(--direct-gold), #d97706);
  border-radius: var(--radius-lg);
  height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.25rem;
}

@media (max-width: 768px) {
  .direct-features {
    grid-template-columns: 1fr;
  }
  
  .direct-features-image {
    height: 250px;
  }
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: linear-gradient(135deg, var(--vsp-silver) 0%, var(--vsp-silver-light) 100%);
  padding: 60px 0 30px;
  color: var(--white);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h4 {
  color: var(--white);
  margin-bottom: 20px;
  font-size: 1.125rem;
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 10px;
  display: block;
  transition: var(--transition);
}

.footer-section a:hover {
  color: var(--flash-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 30px;
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

/* ============================================
   Comparison Page Specific
   ============================================ */
.compare-hero {
  padding: 160px 0 80px;
  background: linear-gradient(135deg, var(--vsp-silver) 0%, var(--vsp-silver-light) 100%);
  text-align: center;
}

.compare-hero h1 {
  color: var(--white);
  margin-bottom: 16px;
}

.compare-hero p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.25rem;
}

.compare-table-wrap {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.compare-table-wrap table {
  width: 100%;
  border-collapse: collapse;
}

.compare-table-wrap th,
.compare-table-wrap td {
  padding: 24px 20px;
  text-align: center;
  border-bottom: 1px solid #eee;
}

.compare-table-wrap th {
  background: var(--vsp-silver);
  color: var(--white);
  font-size: 1rem;
  font-weight: 600;
}

.compare-table-wrap th:first-child,
.compare-table-wrap td:first-child {
  text-align: left;
  padding-left: 30px;
}

.compare-table-wrap tr:last-child td {
  border-bottom: none;
}

.compare-table-wrap tr:hover td {
  background: rgba(6, 182, 212, 0.03);
}

.brand-highlight {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.1), rgba(245, 158, 11, 0.05));
}

@media (max-width: 768px) {
  .compare-table-wrap {
    overflow-x: auto;
  }
  
  .compare-table-wrap table {
    min-width: 800px;
  }
}

/* ============================================
   Form Styles
   ============================================ */
.form-group {
  margin-bottom: 20px;
}

.form-input {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition);
}

.form-input:focus {
  outline: none;
  border-color: var(--flash-cyan);
}

.form-input::placeholder {
  color: var(--text-light);
}

.btn-submit {
  width: 100%;
  background: linear-gradient(135deg, var(--flash-cyan), #0891b2);
  color: var(--white);
  padding: 16px 32px;
  border-radius: var(--radius-md);
  font-size: 1.125rem;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(6, 182, 212, 0.4);
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }