:root {
      --color-purple-950: #3b0764;
      --color-purple-900: #4c1d95;
      --color-purple-800: #5b21b6;
      --color-purple-700: #6d28d9;
      --color-purple-600: #7c3aed;
      --color-purple-500: #8b5cf6;
      --color-purple-400: #a78bfa;
      --color-purple-300: #c4b5fd;
      --color-purple-200: #ddd6fe;
      --color-purple-100: #ede9fe;
      --color-pink-500: #ec4899;
      --color-pink-400: #f472b6;
      --color-pink-300: #f9a8d4;
      --color-white: #ffffff;
      --color-yellow-300: #fcd34d;
      --transition-slow: 0.5s ease;
      --transition-medium: 0.3s ease;
      --transition-fast: 0.2s ease;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
      --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
html, body {
  max-width: 100vw;
  overflow-x: hidden !important;
}
    body {
      font-family: 'Montserrat', sans-serif;
      background: linear-gradient(to bottom, var(--color-purple-950), var(--color-purple-900));
      color: var(--color-purple-100);
      min-height: 100vh;
      line-height: 1.6;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1rem;
    }

    .section {
      padding: 6rem 1rem;
      position: relative;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 1rem;
      color: var(--color-purple-200);
    }

    .section-divider {
      width: 4rem;
      height: 0.25rem;
      background-color: var(--color-purple-500);
      margin: 0 auto 3rem;
      border-radius: 9999px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.75rem 1.5rem;
      border-radius: 9999px;
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition-medium);
      border: 1px solid rgba(124, 58, 237, 0.2);
      outline: none;
    }

    .btn-primary {
      background: linear-gradient(to right, var(--color-purple-800), var(--color-purple-600));
      color: var(--color-white);
    }

    .btn-primary:hover {
      background: linear-gradient(to right, var(--color-purple-700), var(--color-purple-500));
      transform: scale(1.05);
      box-shadow: var(--shadow-md);
    }

    .btn-primary:active {
      transform: scale(0.95);
    }

    .btn-icon {
      width: 2.5rem;
      height: 2.5rem;
      padding: 0;
      border-radius: 9999px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .btn-outline {
      background-color: rgba(91, 33, 182, 0.3);
      backdrop-filter: blur(8px);
      color: var(--color-white);
    }

    .btn-outline:hover {
      background-color: rgba(91, 33, 182, 0.5);
      transform: scale(1.05);
    }

    .btn-outline:active {
      transform: scale(0.95);
    }

    .card {
      background-color: rgba(91, 33, 182, 0.3);
      backdrop-filter: blur(8px);
      border-radius: 1rem;
      padding: 2rem;
      box-shadow: var(--shadow);
      border: 1px solid rgba(124, 58, 237, 0.2);
      transition: all var(--transition-medium);
    }

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

    /* Hero Section */
    .hero {
      position: relative;
      padding: 8rem 1rem;
      text-align: center;
      background: linear-gradient(to right, rgba(59, 7, 100, 0.9), rgba(76, 29, 149, 0.9), rgba(91, 33, 182, 0.9));
      border-bottom-left-radius: 3rem;
      border-bottom-right-radius: 3rem;
      overflow: hidden;
    }

    .hero-content {
      position: relative;
      z-index: 10;
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: var(--color-white);
      font-family: Georgia, serif;
    }

    .hero-subtitle {
      font-size: 1.25rem;
      font-weight: 300;
      margin-bottom: 1.5rem;
      color: var(--color-purple-200);
    }

    .hero-text {
      max-width: 36rem;
      margin: 0 auto;
      font-size: 1.125rem;
      color: var(--color-purple-200);
      font-style: italic;
    }

    .days-counter {
      display: inline-flex;
      align-items: center;
      background-color: rgba(109, 40, 217, 0.3);
      backdrop-filter: blur(8px);
      padding: 1rem 2rem;
      border-radius: 9999px;
      margin-top: 3rem;
      box-shadow: var(--shadow);
      border: 1px solid rgba(124, 58, 237, 0.2);
      transition: transform var(--transition-medium);
    }

    .days-counter:hover {
      transform: scale(1.03);
      box-shadow: var(--shadow-md);
    }

    .days-counter-icon {
      margin-right: 0.75rem;
      color: var(--color-pink-300);
    }

    .days-counter-text {
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--color-white);
    }

    /* Floating Hearts */
    .floating-hearts {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 0;
    }

    .heart {
      position: absolute;
      color: var(--color-pink-300);
      opacity: 0.2;
      will-change: transform;
    }

    /* Hero Hearts */
    .hero-hearts {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      overflow: hidden;
      opacity: 0.2;
    }

    /* Theme Toggle */
    .theme-toggle {
      position: fixed;
      top: 1rem;
      right: 1rem;
      z-index: 50;
    }

    /* Swiper Carousels */
    .swiper {
      width: 100%;
      border-radius: 1rem;
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    .swiper-slide {
      position: relative;
    }

    .carousel-img {
      width: 100%;
      height: auto;
      aspect-ratio: 4/3;
      object-fit: cover;
    }

    .carousel-caption {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
      padding: 2rem;
      color: var(--color-white);
    }

    .carousel-caption-title {
      font-size: 1.5rem;
      font-weight: 500;
      margin-bottom: 0.5rem;
    }

    .carousel-caption-subtitle {
      font-size: 0.875rem;
      opacity: 0.8;
    }

    .swiper-button-next, .swiper-button-prev {
      color: var(--color-white);
      background-color: rgba(91, 33, 182, 0.5);
      width: 3rem;
      height: 3rem;
      border-radius: 50%;
      backdrop-filter: blur(8px);
      border: 1px solid rgba(124, 58, 237, 0.2);
      transition: all var(--transition-medium);
    }

    .swiper-button-next:hover, .swiper-button-prev:hover {
      background-color: rgba(91, 33, 182, 0.7);
      transform: scale(1.05);
    }

    .swiper-button-next:after, .swiper-button-prev:after {
      font-size: 1.25rem;
    }

    .swiper-pagination-bullet {
      background-color: var(--color-purple-500);
      opacity: 0.7;
    }

    .swiper-pagination-bullet-active {
      background-color: var(--color-purple-500);
      opacity: 1;
      transform: scale(1.2);
    }

    /* Polaroid */
    .polaroid {
      background-color: var(--color-white);
      padding: 1.25rem;
      box-shadow: var(--shadow-lg);
      max-width: 20rem;
      margin: 0 auto;
      border-radius: 0.5rem;
      transition: all var(--transition-medium);
      transform: rotate(-3deg);
    }

    .polaroid:hover {
      transform: rotate(2deg) scale(1.02);
    }

    .polaroid-img {
      width: 100%;
      aspect-ratio: 1/1;
      object-fit: cover;
      margin-bottom: 1rem;
    }

    .polaroid-caption {
      text-align: center;
      font-family: 'Caveat', cursive;
      font-size: 1.25rem;
      color: var(--color-purple-800);
      margin-bottom: 0.5rem;
    }

    .polaroid-heart {
      display: flex;
      justify-content: center;
      color: var(--color-pink-500);
    }


    /* Video */.video-caption {
  text-align: center;
  margin-bottom: 8px;
  margin-top: 0;
  font-size: 1.07rem;
  color: var(--color-purple-200, #5B21B6);
  background: rgba(255,255,255,0.7);
  border-radius: 0.6rem;
  padding: 5px 16px 4px 16px;
  width: fit-content;
  max-width: 95%;
  margin-left: auto;
  margin-right: auto;
  font-weight: bold;
}

.video-container {
  position: relative;
  width: 100%;
  max-width: 420px;
  aspect-ratio: 16/9;
  margin: 0 auto;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(124, 58, 237, 0.2);
  transition: all var(--transition-medium);
  background: #1a1625;
}

.video-container:hover {
  transform: scale(1.01);
  box-shadow: var(--shadow-lg);
}

.video-iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: #1a1625;
  border-radius: 1rem;
}

@media (max-width: 600px) {
  .video-container {
    max-width: 98vw;
    border-radius: 10px;
  }
  .video-caption {
    font-size: 0.98rem;
    padding: 4px 7px 3px 7px;
    max-width: 98%;
  }
}


    /* Instagram Grid */
    .instagram-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 1rem;
    }

    @media (min-width: 768px) {
      .instagram-grid {
        grid-template-columns: repeat(4, 1fr);
      }
    }

    .instagram-item {
      position: relative;
      aspect-ratio: 1/1;
      border-radius: 0.75rem;
      overflow: hidden;
      box-shadow: var(--shadow);
      border: 1px solid rgba(124, 58, 237, 0.2);
      transition: all var(--transition-medium);
    }

    .instagram-item:hover {
      transform: scale(1.03) rotate(var(--rotation));
      box-shadow: var(--shadow-md);
    }

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

    .instagram-item:hover .instagram-img {
      transform: scale(1.05);
    }

    .instagram-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(to top, rgba(76, 29, 149, 0.7), transparent);
      opacity: 0;
      transition: opacity var(--transition-medium);
      display: flex;
      align-items: flex-end;
    }

    .instagram-item:hover .instagram-overlay {
      opacity: 1;
    }

    .instagram-icon {
      padding: 1rem;
      color: var(--color-white);
    }

    /* Memories List */
    .memories-list {
      list-style: none;
    }

    .memory-item {
      display: flex;
      align-items: flex-start;
      margin-bottom: 1.5rem;
      transition: transform var(--transition-medium);
    }

    .memory-item:hover {
      transform: translateX(5px);
    }

    .memory-icon {
      background-color: rgba(109, 40, 217, 0.3);
      color: var(--color-purple-300);
      border-radius: 9999px;
      padding: 0.75rem;
      margin-right: 1rem;
      margin-top: 0.25rem;
      transition: transform var(--transition-medium);
    }

    .memory-item:hover .memory-icon {
      transform: scale(1.1);
    }

    .memory-text {
      font-size: 1.125rem;
      color: var(--color-purple-200);
    }

    /* Timeline */
   .timeline {
  position: relative;
  padding: 2rem 0;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  width: 4px;
  height: 100%;
  background: rgba(109, 40, 217, 0.5);
  border-radius: 9999px;
  transform: translateX(-50%);
  z-index: 1;
}

.timeline-item {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 110px;
  margin-bottom: 3rem;
  z-index: 2;
}

.timeline-content {
  width: 40%;
  padding: 0 2rem;
  text-align: right;
  min-height: 80px;
}

.timeline-item .timeline-content:last-child {
  text-align: left;
}

.timeline-icon {
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.3rem;
  height: 3.3rem;
  background: linear-gradient(to bottom right, #6d28d9, #5b21b6);
  border-radius: 50%;
  border: 4px solid #3b0764;
  box-shadow: 0 2px 18px rgba(109, 40, 217, 0.20);
  margin: 0 2rem;
}

.timeline-icon i {
  color: #fff;
  font-size: 1.6rem;
}

.timeline-date {
  font-size: 0.95rem;
  font-weight: 500;
  color: #c4b5fd;
}

.timeline-event {
  font-size: 1.18rem;
  font-weight: 600;
  color: #ede9fe;
  margin: 0.5rem 0 0 0;
}

/* Responsivo */
@media (max-width: 800px) {
  .timeline-item {
    flex-direction: row !important; /* Mantener lado a lado */
    min-height: 100px !important;
    margin-bottom: 1.5rem !important;
  }
  .timeline-content {
    width: 40% !important; /* Igual que en PC */
    text-align: right;
    padding: 0 0.5rem !important;
    font-size: 0.98rem !important;
  }
  .timeline-item .timeline-content:last-child {
    text-align: left;
  }
  .timeline-icon {
    margin: 0 0.5rem !important;
    width: 2.3rem !important;
    height: 2.3rem !important;
    font-size: 1rem !important;
  }
  .timeline-line {
    left: 50% !important;
    transform: translateX(-50%) !important;
  }
}

@media (max-width: 600px) {
  .timeline-content {
    font-size: 0.93rem !important;
    padding: 0 0.2rem !important;
  }
}

    /* Songs */
    .songs-list {
      list-style: none;
    }

    .song-item {
      display: flex;
      align-items: center;
      padding: 1rem;
      border-radius: 0.5rem;
      transition: all var(--transition-medium);
    }

    .song-item:hover {
      background-color: rgba(109, 40, 217, 0.2);
      transform: translateX(5px);
    }

    .song-icon {
      background-color: rgba(109, 40, 217, 0.3);
      color: var(--color-purple-300);
      border-radius: 9999px;
      padding: 0.75rem;
      margin-right: 1rem;
      transition: transform var(--transition-medium);
    }

    .song-item:hover .song-icon {
      transform: scale(1.1);
    }

    .song-info {
      flex: 1;
    }

    .song-title {
      font-weight: 500;
      color: var(--color-purple-200);
    }

    .song-artist {
      font-size: 0.875rem;
      color: var(--color-purple-400);
    }

    /* Dreams Grid */
    .dreams-grid {
      display: grid;
      grid-template-columns: repeat(1, 1fr);
      gap: 1.5rem;
    }

    @media (min-width: 768px) {
      .dreams-grid {
        grid-template-columns: repeat(3, 1fr);
      }
    }

    .dream-card {
      height: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      transition: all var(--transition-medium);
    }

    .dream-card:hover {
      transform: scale(1.03) rotate(var(--rotation)) translateY(-5px);
    }

    .dream-icon {
      background-color: rgba(109, 40, 217, 0.3);
      color: var(--color-purple-300);
      border-radius: 9999px;
      padding: 1rem;
      margin-bottom: 1rem;
      transition: transform var(--transition-medium);
    }

    .dream-card:hover .dream-icon {
      transform: scale(1.1);
    }

    .dream-text {
      font-size: 1.125rem;
      color: var(--color-purple-200);
    }

    /* Places */
    .places-list {
      list-style: none;
    }

    .place-item {
      display: flex;
      align-items: center;
      padding: 1rem;
      border-radius: 0.5rem;
      transition: all var(--transition-medium);
    }

    .place-item:hover {
      background-color: rgba(109, 40, 217, 0.2);
      transform: translateX(5px);
    }

    .place-icon {
      background-color: rgba(109, 40, 217, 0.3);
      color: var(--color-purple-300);
      border-radius: 9999px;
      padding: 0.75rem;
      margin-right: 1rem;
      transition: transform var(--transition-medium);
    }

    .place-item:hover .place-icon {
      transform: scale(1.1);
    }

    .place-text {
      font-size: 1.125rem;
      color: var(--color-purple-200);
    }

    .map-container {
      position: relative;
      aspect-ratio: 1/1;
      border-radius: 0.75rem;
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid rgba(124, 58, 237, 0.2);
      transition: all var(--transition-medium);
    }

    .map-container:hover {
      transform: scale(1.02);
      box-shadow: var(--shadow-lg);
    }

    .map-img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

.map-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(76, 29, 149, 0.7), transparent);
  display: flex;
  align-items: flex-end;
  pointer-events: none; /* <--- Esto es clave */
}

    .map-text {
      padding: 1.5rem;
      width: 100%;
      color: var(--color-white);
      font-size: 1.125rem;
      font-weight: 500;
    }

    /* Jokes Grid */
    .jokes-grid {
      display: grid;
      grid-template-columns: repeat(1, 1fr);
      gap: 1.5rem;
    }

    @media (min-width: 768px) {
      .jokes-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    .joke-card {
      transition: all var(--transition-medium);
    }

    .joke-card:hover {
      transform: scale(1.02) rotate(var(--rotation));
    }

    .joke-text {
      font-size: 1.125rem;
      color: var(--color-purple-200);
      font-style: italic;
    }

    .joke-heart {
      display: flex;
      justify-content: flex-end;
      margin-top: 0.5rem;
      color: var(--color-pink-500);
    }

    /* Surprise */
    .surprise-container {
      max-width: 36rem;
      margin: 4rem auto 0;
      display: none;
      opacity: 0;
      transform: translateY(20px) scale(0.9);
      transition: all var(--transition-slow);
      position: relative;
      z-index: 10;
    }

    .surprise-container.active {
      display: block;
      opacity: 1;
      transform: translateY(0) scale(1);
    }

    .surprise-title {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--color-purple-300);
      margin-bottom: 1rem;
    }

    .surprise-text {
      font-size: 1.125rem;
      color: var(--color-purple-200);
      line-height: 1.7;
    }

    .surprise-heart {
      display: flex;
      justify-content: center;
      margin-top: 1.5rem;
      color: var(--color-pink-500);
    }

    /* Surprise Button Animation */
    .btn-surprise {
      position: relative;
      overflow: hidden;
      transition: all 0.4s ease;
      z-index: 1;
    }

    .btn-surprise:before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(45deg, var(--color-purple-700), var(--color-pink-500));
      opacity: 0;
      z-index: -1;
      transition: opacity 0.4s ease;
    }

    .btn-surprise:hover:before {
      opacity: 1;
    }

    .btn-surprise:active {
      transform: scale(0.95);
    }

    .btn-surprise.clicked {
      animation: pulse-button 0.5s ease;
    }
.text-center {
  text-align: center;
}
    @keyframes pulse-button {
      0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(236, 72, 153, 0.7);
      }
      50% {
        transform: scale(0.95);
        box-shadow: 0 0 0 10px rgba(236, 72, 153, 0);
      }
      100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(236, 72, 153, 0);
      }
    }

    /* Glow Effect */
    .glow-effect {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at center, rgba(236, 72, 153, 0.3), transparent 70%);
      opacity: 0;
      pointer-events: none;
      z-index: 5;
      transition: opacity 0.5s ease;
    }

    .glow-effect.active {
      opacity: 1;
      animation: pulse-glow 2s ease-out;
    }

    @keyframes pulse-glow {
      0% {
        opacity: 0;
        transform: scale(0.8);
      }
      50% {
        opacity: 1;
        transform: scale(1.2);
      }
      100% {
        opacity: 0;
        transform: scale(1.5);
      }
    }

    /* Flying Hearts Animation */
    .flying-heart {
      position: fixed;
      color: var(--color-pink-500);
      font-size: 1.5rem;
      pointer-events: none;
      z-index: 100;
      opacity: 0;
    }

    /* Quote */
    .quote-container {
      position: relative;
      max-width: 48rem;
      margin: 0 auto;
      transition: transform var(--transition-medium);
    }

    .quote-container:hover {
      transform: scale(1.02);
    }

    .quote-mark {
      position: absolute;
      top: -1.5rem;
      left: 0;
      font-size: 9rem;
      color: rgba(109, 40, 217, 0.2);
      opacity: 0.2;
    }

    .quote-text {
      position: relative;
      z-index: 10;
      font-size: 1.5rem;
      font-style: italic;
      color: var(--color-purple-200);
      line-height: 1.7;
    }

    @media (min-width: 768px) {
      .quote-text {
        font-size: 1.875rem;
      }
    }

    .quote-author {
      margin-top: 1.5rem;
      font-size: 1.125rem;
      color: var(--color-purple-400);
    }

    /* Love Letter */
    .letter-content {
      max-width: 42rem;
      margin: 0 auto;
    }

    .letter-paragraph {
      font-size: 1.125rem;
      color: var(--color-purple-200);
      line-height: 1.7;
      margin-bottom: 1.5rem;
    }

    .letter-signature {
      font-size: 1.125rem;
      color: var(--color-purple-200);
      font-weight: 500;
    }

    .letter-heart {
      display: flex;
      justify-content: center;
      margin-top: 1rem;
      color: var(--color-pink-500);
    }

    /* Footer */
    .footer {
      padding: 3rem 1rem;
      text-align: center;
      background: linear-gradient(to right, var(--color-purple-900), var(--color-purple-800));
      color: var(--color-white);
    }

    .footer-text {
      font-size: 1.25rem;
    }

    .footer-copyright {
      font-size: 0.875rem;
      margin-top: 0.75rem;
      opacity: 0.8;
    }

    .footer-actions {
      margin-top: 1.5rem;
      display: flex;
      justify-content: center;
    }

    /* Dark mode */
    .dark-mode {
      --color-bg-main: #F5F6FA;
  --color-bg-secondary: #D7DBDF;
  --color-primary: #B0B3B8;
  --color-secondary: #7E7E7E;
  --color-accent: #F9A8D4;
  --color-text-main: #212529;
  --color-text-alt: #444;
    }

    /* Responsive */
    @media (min-width: 768px) {
      .hero-title {
        font-size: 3.75rem;
      }

      .hero-subtitle {
        font-size: 1.5rem;
      }

      .section-title {
        font-size: 2.25rem;
      }

      .grid-2-cols {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
      }
    }

    /* Animations */
    .animate-float {
      animation: float 6s ease-in-out infinite;
    }

    .animate-pulse {
      animation: pulse 3s ease-in-out infinite;
    }

    .animate-pulse-glow {
      animation: pulse-glow 4s ease-in-out infinite;
    }

    @keyframes float {
      0%, 100% {
        transform: translateY(0);
      }
      50% {
        transform: translateY(-20px);
      }
    }

    @keyframes pulse {
      0%, 100% {
        transform: scale(1);
      }
      50% {
        transform: scale(1.1);
      }
    }

    @keyframes pulse-glow {
      0%, 100% {
        opacity: 0.6;
        filter: blur(10px);
      }
      50% {
        opacity: 1;
        filter: blur(15px);
      }
    }

    /* Shake Animation */
    @keyframes shake {
      0%, 100% { transform: translateX(0); }
      10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
      20%, 40%, 60%, 80% { transform: translateX(5px); }
    }

    .shake {
      animation: shake 0.5s ease-in-out;
    }