/* ============================================================
   Hackathon Lovers v2-b2b — Modern CSS Design System
   Colors: #ee3733 (accent), #444 (dark text), #0d0d0d (dark bg)
   Font: Inter (Google Fonts)
   ============================================================ */

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

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: #333;
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

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

ul { list-style: none; }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- CSS Custom Properties --- */
:root {
  --red: #ee3733;
  --red-dark: #cc2520;
  --red-glow: rgba(238, 55, 51, 0.3);
  --dark: #0d0d0d;
  --dark-light: #1a1a1a;
  --dark-card: #151515;
  --gray-900: #222;
  --gray-700: #444;
  --gray-500: #777;
  --gray-300: #bbb;
  --gray-100: #f5f5f5;
  --white: #ffffff;
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.12);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.15);
  --shadow-glow: 0 0 30px var(--red-glow);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--gray-900);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 3vw, 1.75rem); }
h4 { font-size: 1.25rem; }

p {
  color: var(--gray-500);
  line-height: 1.7;
}

.accent { color: var(--red); }
.text-white { color: var(--white); }
.text-center { text-align: center; }
.text-light { color: var(--gray-300); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--red), var(--red-dark));
  color: var(--white);
  box-shadow: 0 4px 15px var(--red-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--red-glow);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.6);
  transform: translateY(-2px);
}

.btn-outline-dark {
  background: transparent;
  color: var(--gray-700);
  border: 2px solid var(--gray-300);
}

.btn-outline-dark:hover {
  border-color: var(--red);
  color: var(--red);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 10px 24px;
  font-size: 0.875rem;
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(13, 13, 13, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  padding: 10px 0;
}

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

.navbar-logo img {
  filter: brightness(0) invert(1);
}

.navbar-center {
  display: flex;
  align-items: center;
  gap: 24px;
}

.navbar-social {
  display: flex;
  align-items: center;
  gap: 12px;
}

.navbar-social a {
  color: rgba(255,255,255,0.6);
  font-size: 1rem;
  transition: var(--transition);
}

.navbar-social a:hover {
  color: var(--white);
}

/* --- Mode Toggle --- */
.mode-toggle {
  display: flex;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-full);
  padding: 4px;
  border: 1px solid rgba(255,255,255,0.1);
}

.mode-toggle button,
.mode-toggle a {
  padding: 8px 24px;
  border: none;
  border-radius: var(--radius-full);
  background: transparent;
  color: rgba(255,255,255,0.6);
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.mode-toggle button.active,
.mode-toggle a.active {
  background: var(--red);
  color: var(--white);
  box-shadow: 0 2px 10px var(--red-glow);
}

.mode-toggle button:hover:not(.active),
.mode-toggle a:hover:not(.active) {
  color: var(--white);
}

/* Mobile menu button */
.navbar-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--dark);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.3;
  transition: opacity 0.6s ease;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(13,13,13,0.7) 0%,
    rgba(13,13,13,0.5) 50%,
    rgba(13,13,13,0.9) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: 120px 24px 80px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(238, 55, 51, 0.15);
  border: 1px solid rgba(238, 55, 51, 0.3);
  border-radius: var(--radius-full);
  color: var(--red);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: 0.03em;
}

.hero h1 {
  color: var(--white);
  margin-bottom: 20px;
  font-weight: 800;
}

.hero h1 .accent {
  background: linear-gradient(135deg, var(--red), #ff6b5a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  color: rgba(255,255,255,0.7);
  font-size: 1.2rem;
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Decorative glow */
.hero::after {
  content: '';
  position: absolute;
  bottom: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, var(--red-glow), transparent 70%);
  pointer-events: none;
  z-index: 1;
}

/* --- Section Base --- */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

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

.section-header p {
  font-size: 1.1rem;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--red);
  margin-bottom: 12px;
}

/* --- Value Props Strip --- */
.value-strip {
  padding: 60px 0;
  background: var(--gray-100);
}

.value-strip .container {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.value-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: var(--white);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
  font-size: 1rem;
  color: var(--gray-700);
  transition: var(--transition);
}

.value-pill:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.value-pill i {
  color: var(--red);
  font-size: 1.1rem;
}

/* Community value cards */
.value-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.value-card {
  text-align: center;
  padding: 48px 32px;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.value-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.value-card-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--red), var(--red-dark));
  border-radius: var(--radius-md);
  color: var(--white);
  font-size: 1.5rem;
  margin: 0 auto 20px;
}

.value-card h4 {
  margin-bottom: 12px;
}

.value-card p {
  font-size: 0.95rem;
}

/* --- Stats Section --- */
.stats {
  background: linear-gradient(135deg, var(--red), var(--red-dark));
  padding: 80px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.stat-item {
  text-align: center;
}

.stat-item i {
  font-size: 2rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: 16px;
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 1rem;
  color: rgba(255,255,255,0.8);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --- B2B Services Grid --- */
.services {
  background: var(--dark);
  padding: 100px 0;
}

.services .section-header h2,
.services .section-header p {
  color: var(--white);
}

.services .section-header p {
  color: rgba(255,255,255,0.6);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--dark-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red), transparent);
  opacity: 0;
  transition: var(--transition);
}

.service-card:hover {
  border-color: rgba(238, 55, 51, 0.2);
  transform: translateY(-4px);
  box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

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

.service-card-icon {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(238, 55, 51, 0.1);
  border-radius: 12px;
  color: var(--red);
  font-size: 1.3rem;
  margin-bottom: 20px;
}

.service-card h4 {
  color: var(--white);
  margin-bottom: 8px;
  font-size: 1.15rem;
}

.service-card .service-hook {
  color: var(--red);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.service-card p {
  color: rgba(255,255,255,0.55);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* --- Hackathons Gallery --- */
.hackathons {
  padding: 100px 0;
  background: var(--white);
}

.hack-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.hack-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
  transition: var(--transition);
}

.hack-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.hack-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.hack-card:hover img {
  transform: scale(1.08);
}

.hack-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(0,0,0,0.85) 0%,
    rgba(0,0,0,0.2) 50%,
    transparent 100%
  );
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 20px;
}

.hack-card-name {
  color: var(--white);
  font-weight: 700;
  font-size: 1rem;
}

.hack-card-date {
  color: rgba(255,255,255,0.6);
  font-size: 0.85rem;
  margin-top: 4px;
}

/* --- Testimonials --- */
.testimonials {
  padding: 100px 0;
  background: var(--gray-100);
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.testimonial-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.testimonial-quote {
  font-size: 1rem;
  color: var(--gray-700);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 20px;
  font-style: italic;
  position: relative;
  padding-left: 20px;
  border-left: 3px solid var(--red);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.testimonial-author img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial-author-info h5 {
  font-size: 0.95rem;
  color: var(--gray-900);
}

.testimonial-author-info span {
  font-size: 0.85rem;
  color: var(--gray-500);
}

/* --- CTA Section --- */
.cta {
  padding: 100px 0;
  background: var(--dark);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(238,55,51,0.15), transparent 70%);
  pointer-events: none;
}

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

.cta p {
  color: rgba(255,255,255,0.6);
  font-size: 1.15rem;
  margin-bottom: 36px;
  max-width: 550px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

.cta .hero-buttons {
  position: relative;
}

/* --- Team Section --- */
.team {
  padding: 100px 0;
  background: var(--white);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
  justify-items: center;
}

.team-card {
  text-align: center;
  transition: var(--transition);
}

.team-card:hover {
  transform: translateY(-6px);
}

.team-photo {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid var(--gray-100);
  transition: var(--transition);
  filter: grayscale(1);
}

.team-card:hover .team-photo {
  border-color: var(--red);
  filter: grayscale(0);
}

.team-card h4 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.team-card .team-handle {
  color: var(--gray-500);
  font-size: 0.85rem;
  margin-bottom: 4px;
}

.team-card .team-role {
  color: var(--red);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.team-social {
  display: flex;
  justify-content: center;
  gap: 10px;
}

.team-social a {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gray-100);
  color: var(--gray-500);
  font-size: 0.85rem;
  transition: var(--transition);
}

.team-social a:hover {
  background: var(--red);
  color: var(--white);
}

/* --- Footer --- */
.footer {
  background: var(--dark);
  padding: 60px 0 30px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand img {
  height: 24px;
  filter: brightness(0) invert(1);
  margin-bottom: 12px;
}

.footer-brand p {
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
  max-width: 300px;
}

.footer-links h5 {
  color: var(--white);
  font-size: 0.9rem;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links a {
  display: block;
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
  padding: 4px 0;
  transition: var(--transition);
}

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

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.5);
  font-size: 1rem;
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--red);
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  color: rgba(255,255,255,0.35);
  font-size: 0.85rem;
}

.footer-bottom a {
  color: var(--red);
}

.footer-bottom .heart {
  color: var(--red);
}

/* --- Animations --- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.stagger-children .fade-up:nth-child(1) { transition-delay: 0.05s; }
.stagger-children .fade-up:nth-child(2) { transition-delay: 0.1s; }
.stagger-children .fade-up:nth-child(3) { transition-delay: 0.15s; }
.stagger-children .fade-up:nth-child(4) { transition-delay: 0.2s; }
.stagger-children .fade-up:nth-child(5) { transition-delay: 0.25s; }
.stagger-children .fade-up:nth-child(6) { transition-delay: 0.3s; }
.stagger-children .fade-up:nth-child(7) { transition-delay: 0.35s; }
.stagger-children .fade-up:nth-child(8) { transition-delay: 0.4s; }
.stagger-children .fade-up:nth-child(9) { transition-delay: 0.45s; }
.stagger-children .fade-up:nth-child(10) { transition-delay: 0.5s; }
.stagger-children .fade-up:nth-child(11) { transition-delay: 0.55s; }
.stagger-children .fade-up:nth-child(12) { transition-delay: 0.6s; }

/* --- Visibility classes for toggle --- */
.mode-community,
.mode-enterprise {
  display: none;
}

body.community-mode .mode-community {
  display: block;
}

body.enterprise-mode .mode-enterprise {
  display: block;
}

body.community-mode .mode-community.grid-display {
  display: grid;
}

body.enterprise-mode .mode-enterprise.grid-display {
  display: grid;
}

body.community-mode .mode-community.flex-display {
  display: flex;
}

body.enterprise-mode .mode-enterprise.flex-display {
  display: flex;
}

/* Show sections that are always visible */
.mode-both {
  display: block;
}

.mode-both.grid-display {
  display: grid;
}

.scroll-indicator{
  color: white;
  position: absolute;
  bottom: 20px;
  font-size: 30px;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hack-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

  .value-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .navbar-center {
    display: none;
  }

  .navbar-social {
    display: none;
  }

  .navbar-menu-btn {
    display: block;
  }

  /* Mobile menu open */
  .navbar.menu-open .navbar-center {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(13,13,13,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 24px;
    border-bottom: 1px solid var(--glass-border);
  }

  .navbar.menu-open .navbar-social {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(13,13,13,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 16px 24px;
    justify-content: center;
    border-bottom: 1px solid var(--glass-border);
    margin-top: 70px;
  }

  .hero-content {
    padding: 140px 20px 60px;
  }

  .hero h1 {
    font-size: 2rem;
  }

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

  .hack-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .stat-number {
    font-size: 2.2rem;
  }

  .value-cards {
    grid-template-columns: 1fr;
  }

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

  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-social {
    justify-content: center;
  }

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

  .section {
    padding: 60px 0;
  }
}

@media (max-width: 480px) {
  .hack-grid {
    grid-template-columns: 1fr;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .mode-toggle button,
  .mode-toggle a {
    padding: 8px 16px;
    font-size: 0.8rem;
  }

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

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--dark);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-500);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--red);
}

/* --- Selection highlight --- */
::selection {
  background: var(--red);
  color: var(--white);
}

/* --- Scroll indicator --- */
.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 24px;
  color: inherit;
  animation: bounce 2s infinite;
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 35px;
  color: white;
  transition: opacity 0.3s ease;
}

.scroll-indicator:hover {
  opacity: 1;
}

@keyframes bounce {
  0%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  50% {
    transform: translateX(-50%) translateY(10px);
  }
}