html,
  body {
      margin: 0px;
      width: 100%;
      height: 100%;
      overflow: hidden;
      background: #000;
  }

  #orientation-lock {
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      background: rgba(0, 0, 0, 0.96);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      z-index: 99999;
      color: #fff;
      text-align: center;
      font-family: 'Arial', sans-serif;
      font-size: 18px;
      display: none;
      transition: background 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  }

  #orientation-lock .phone-icon {
      font-size: 64px;
      opacity: 0.92;
      animation: phone-bounce-smooth 2.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
      filter: drop-shadow(0 4px 16px #fff3);
      transition: filter 0.4s, opacity 0.4s;
  }

  @keyframes phone-bounce-smooth {
      0% {
          transform: rotate(-45deg) scale(1);
          opacity: 0.8;
      }

      20% {
          transform: rotate(-45deg) scale(1.05);
          opacity: 1;
      }

      40% {
          transform: rotate(45deg) scale(1.1);
          opacity: 1;
      }

      60% {
          transform: rotate(45deg) scale(1.1);
          opacity: 1;
      }

      80% {
          transform: rotate(-45deg) scale(1.05);
          opacity: 1;
      }

      100% {
          transform: rotate(-45deg) scale(1);
          opacity: 0.8;
      }
  }

  #matrix-rain {
      position: fixed;
      top: 0;
      left: 0;
      width: 104%;
      height: 100%;
      z-index: 9999;
      pointer-events: none;
  }

  #settingsModal {
      z-index: 11000 !important;
  }

  body {
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      margin: 0;
      font-family: 'Arial', sans-serif;
      overflow: hidden;
      position: relative;
  }


  /* Enhanced Heart Effect */
  .heart {
      position: fixed;
      z-index: 1000;
      pointer-events: none;
      color: #ff6b6b;
      font-size: 20px;
      animation: float-heart 4s ease-in-out forwards;
  }

  @keyframes float-heart {
      0% {
          transform: translateY(0) scale(0);
          opacity: 0;
      }

      10% {
          transform: translateY(-20px) scale(1);
          opacity: 1;
      }

      90% {
          opacity: 1;
      }

      100% {
          transform: translateY(-700px) scale(0);
          opacity: 0;
      }
  }


  .content-display {
      position: fixed;
      top: 2%;
      left: 50%;
      transform: translateX(-50%);
      width: 85vw;
      max-width: 650px;
      min-height: 160px;
      max-height: 230px;
      background:
          linear-gradient(145deg, #ffffff 0%, #fefefe 100%),
          radial-gradient(circle at 50% 50%, rgba(255, 192, 203, 0.05) 0%, transparent 60%);
      border: none;
      border-radius: 20px;
      padding: 40px 35px;
      box-shadow:
          0 20px 60px rgba(255, 105, 180, 0.15),
          0 10px 30px rgba(0, 0, 0, 0.08),
          inset 0 1px 0 rgba(255, 255, 255, 0.9),
          inset 0 -1px 0 rgba(255, 192, 203, 0.1);
      backdrop-filter: blur(20px);

      /* Mặc định ẩn */
      opacity: 0;
      display: none;
      pointer-events: none;

      font-family: 'Crimson Text', serif;
      overflow-y: auto;
      /* Luôn cho phép scroll */
      scrollbar-width: thin;
      scrollbar-color: rgba(255, 105, 180, 0.3) transparent;
      scroll-behavior: smooth;
      box-sizing: border-box;
      z-index: 10;

      /* Romantic paper texture
            background-image:
                radial-gradient(circle at 100% 50%, transparent 20%, rgba(255, 240, 245, 0.3) 21%, rgba(255, 240, 245, 0.3) 34%, transparent 35%, transparent),
                linear-gradient(0deg, rgba(255, 240, 245, 0.1) 50%, transparent 50%);
            background-size: 30px 60px, 100% 4px; */

      /* Romantic border decoration */
      border: 3px solid transparent;
      /* background-clip: padding-box; */

      /* Animation cho hiệu ứng xuất hiện */
      transition: all 0.5s ease;
  }

  .content-display::after {
      content: '💕';
      position: absolute;
      top: 15px;
      right: 20px;
      font-size: 24px;
      opacity: 0.6;
      animation: heartbeat 2s ease-in-out infinite;
  }

  .content-display.show {
      display: block;
      opacity: 1 !important;
      pointer-events: auto;
      background: rgba(255, 255, 255, 0.98) !important;
  }

  .content-display p {
      margin: 0;
      padding: 0;
      color: #2c1810;
      font-size: clamp(18px, 3vw, 24px);
      line-height: 2.2;
      text-align: center;
      font-weight: 400;
      font-family: 'Dancing Script', 'Brush Script MT', 'Lucida Handwriting', 'Comic Sans MS', cursive;
      width: 100%;
      opacity: 1;
      transform: translateY(0);
      transition: opacity 0.8s ease-in-out, transform 0.8s ease-in-out;
      min-height: fit-content;
      display: block;
      text-shadow: 0 1px 2px rgba(255, 105, 180, 0.1);
      letter-spacing: 0.5px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      text-rendering: optimizeLegibility;

      /* Romantic text effects */
      background: linear-gradient(45deg, #8b4513, #a0522d, #8b4513, #6b3410);
      background-size: 400% 400%;
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      animation: romanticText 8s ease-in-out infinite;
  }

  @keyframes romanticBorder {

      0%,
      100% {
          background-position: 0% 50%;
      }

      50% {
          background-position: 100% 50%;
      }
  }

  @keyframes heartbeat {

      0%,
      100% {
          transform: scale(1);
          opacity: 0.6;
      }

      50% {
          transform: scale(1.2);
          opacity: 0.9;
      }
  }

  @keyframes floatingHearts {

      0%,
      100% {
          transform: translateY(0px);
      }

      50% {
          transform: translateY(-5px);
      }
  }


  .typewriter-text {
      display: inline;
  }

  .typewriter-cursor {
      display: inline-block;
      background-color: #333;
      margin-left: 2px;
      width: 2px;
      height: 1.2em;
      animation: blink 1s infinite;
  }

  @keyframes blink {

      0%,
      50% {
          opacity: 1;
      }

      51%,
      100% {
          opacity: 0;
      }
  }




  .firework-container {
      position: fixed;
      top: 50%;
      left: 50%;
      width: 200px;
      height: 200px;
      pointer-events: none;
      opacity: 0;
      transform: translate(-50%, -50%);
      z-index: 200;
  }

  .firework {
      position: absolute;
      top: 50%;
      left: 50%;
      width: 6px;
      height: 20px;
      background: radial-gradient(circle, #fff 0%, transparent 70%);
      border-radius: 50% 50% 0 0;
      transform-origin: bottom center;
      opacity: 0;
      animation: fireworkExplode 1s ease forwards;
  }

  @keyframes fireworkExplode {
      0% {
          opacity: 1;
          transform: translateY(0) scaleY(1);
      }

      100% {
          opacity: 0;
          transform: translateY(-100px) scaleY(3);
      }
  }


  @media screen and (max-height: 500px) and (orientation: landscape) {
      .content-display::after {
          top: 5px;
          right: 5px;
          font-size: 20px;
      }

      .content-display {
          width: 45vw;
          min-height: 50px;
          max-height: 80px;
          padding: 5px 8px;
          top: 10px;
      }

      .content-display p {
          font-size: 13px !important;
      }

      .firework-container {
          width: 100px;
          height: 100px;
      }
  }

  .music-control {
      position: fixed;
      top: 20px;
      right: 20px;
      width: 40px;
      height: 40px;
      background: none;
      border: none;
      border-radius: 50%;
      cursor: pointer;
      z-index: 10001;
      box-shadow: 0 4px 15px rgba(250, 250, 250, 0.4);
      transition: all 0.3s ease;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 17px;
      color: rgb(205, 202, 202);
      outline: none;
  }

  .music-control:hover {
      transform: scale(1.1);
      box-shadow: 0 6px 20px rgba(255, 107, 157, 0.6);
  }

  .music-control:active {
      transform: scale(0.95);
  }

  .music-control.playing {
      animation: musicPulse 1.5s infinite;
  }

  @keyframes musicPulse {

      0%,
      100% {
          transform: scale(1);
          box-shadow: 0 4px 15px rgba(255, 107, 157, 0.4);
      }

      50% {
          transform: scale(1.05);
          box-shadow: 0 8px 25px rgba(255, 107, 157, 0.8);
      }
  }

  .settings-button {
      position: fixed;
      top: 20px;
      right: 90px;
      width: 40px;
      height: 40px;
      background: linear-gradient(135deg, #b20404, #2a1717);
      border: none;
      border-radius: 50%;
      cursor: pointer;
      z-index: 10001;
      box-shadow: 0 4px 15px rgba(76, 175, 80, 0.4);
      transition: all 0.3s ease;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      color: rgb(255, 255, 255);
      outline: none;
  }

  .settings-button:hover {
      transform: scale(1.1);
      box-shadow: 0 6px 20px rgba(76, 175, 80, 0.6);
  }

  .settings-button:active {
      transform: scale(0.95);
  }

  /* Modal container */
  .modal {
      display: none;
      position: fixed;
      z-index: 10002;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      /* background-color: rgba(0, 0, 0, 0.5); */
      overflow: auto;
      animation: fadeIn 0.3s ease-in-out;
  }

  /* Modal animation */
  @keyframes fadeIn {
      from {
          opacity: 0;
      }

      to {
          opacity: 1;
      }
  }

  /* Modal content */
  .modal-content {
      background-color: #ffffff;
      margin: 3vh auto;
      padding: 0;
      border: none;
      width: 90%;
      max-width: 600px;
      height: 80vh;
      border-radius: 12px;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
      display: flex;
      flex-direction: column;
      overflow: hidden;
  }

  /* Modal header */
  .modal-header {
      background: linear-gradient(135deg, #b69f08, #181818);
      padding: 15px 20px;
      border-radius: 12px 12px 0 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
  }

  .modal-header h2 {
      margin: 0;
      color: white;
      font-size: 24px;
      font-weight: 600;
  }

  .close {
      color: white;
      font-size: 28px;
      font-weight: bold;
      cursor: pointer;
      transition: color 0.2s ease;
      line-height: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      border-radius: 4px;
  }

  .close:hover,
  .close:focus {
      color: #ffeb3b;
  }

  /* Modal body */
  .modal-body {
      flex: 1;
      padding: 20px;
      overflow-y: auto;
      background: #f9f9f9;
  }

  /* Settings section */
  .settings-section {
      margin-bottom: 20px;
      padding: 15px;
      background: white;
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  }

  .settings-section h3 {
      margin: 0 0 15px;
      font-size: 18px;
      color: #333;
      border-bottom: 2px solid #eee;
      padding-bottom: 8px;
  }

  /* Form group */
  .form-group {
      margin-bottom: 15px;
  }

  .form-group label {
      display: block;
      margin-bottom: 5px;
      font-weight: 600;
      color: #444;
      font-size: 14px;
  }

  .form-group input[type="color"] {
      width: 100%;
      height: 40px;
      padding: 0;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      appearance: none;
      -webkit-appearance: none;
      background-color: transparent;
      box-shadow: inset 0 0 0 1px #ddd, inset 0 -1px 0 rgba(255, 255, 255, 0.5);
  }

  /* Form row for side-by-side inputs */
  .form-row {
      display: flex;
      gap: 15px;
  }

  .form-row .form-group {
      flex: 1;
  }

  /* Inputs and selects */
  .modal-content select,
  .modal-content input[type="text"],
  .modal-content input[type="file"],
  .modal-content input[type="color"],
  .modal-content textarea {
      width: 100%;
      padding: 10px;
      margin-bottom: 10px;
      border: 1px solid #ddd;
      border-radius: 6px;
      font-size: 14px;
      background: #fff;
      transition: border-color 0.2s ease;
      box-sizing: border-box;
      white-space: normal !important;
      /* Thêm dòng này */
      word-wrap: normal !important;
      /* Thêm dòng này */
  }

  .modal-content select:focus,
  .modal-content input[type="text"]:focus,
  .modal-content input[type="file"]:focus,
  .modal-content input[type="color"]:focus,
  .modal-content textarea:focus {
      border-color: #ff6b9d;
      outline: none;
  }

  .modal-content textarea {
      min-height: 80px;
      resize: vertical;
      font-family: inherit;
      line-height: 1.4;
      white-space: pre-wrap !important;
      /* Chỉ cho textarea */
  }

  /* CSS cho Photo Preview trong Settings - Gọn gàng, compact */
  .photo-item {
      margin-bottom: 8px;
      padding: 5px;
      border: 1px solid #ddd;
      border-radius: 6px;
      background: #f9f9f9;
      width: auto;
      box-sizing: border-box;
      flex-shrink: 0;
      display: inline-block;
      vertical-align: top;
  }

  .photo-item .form-group {
      margin-bottom: 0;
  }

  .photo-item label {
      display: none !important;
  }

  .photo-preview {
      position: relative;
      display: inline-block;
      width: 80px;
      height: 80px;
  }

  .photo-preview-img {
      width: 80px;
      height: 80px;
      border-radius: 6px;
      border: 1px solid #ddd;
      display: block;
      object-fit: cover;
  }

  .remove-photo-btn {
      position: absolute !important;
      top: -6px !important;
      right: -6px !important;
      background: #f44336 !important;
      color: white !important;
      border: none !important;
      border-radius: 50% !important;
      width: 15px !important;
      height: 15px !important;
      cursor: pointer !important;
      font-size: 10px !important;
      line-height: 1 !important;
      box-shadow: 0 2px 4px rgba(0,0,0,0.2) !important;
      display: flex !important;
      align-items: center !important;
      justify-content: center !important;
      z-index: 10 !important;
      padding: 0 !important;
      font-weight: bold !important;
      min-width: 15px !important;
      min-height: 15px !important;
  }

  .remove-photo-btn:hover {
      background: #d32f2f !important;
      transform: scale(1.1) !important;
  }


  #photoGallerySettings {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 10px;
  }



  /* Buttons */
  .modal-content button {
      background: linear-gradient(135deg, #b69f08, #181818);
      color: white;
      padding: 12px 24px;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      font-size: 16px;
      font-weight: 600;
      transition: background 0.2s ease, transform 0.2s ease;
  }

  .modal-content button:hover {
      background: linear-gradient(135deg, #181818, #b69f08);
      transform: translateY(-2px);
  }

  .modal-content button:active {
      transform: translateY(0);
  }


  .stars-container {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 5;
      pointer-events: none;
      display: none;
  }

  .star {
      position: absolute;
      width: 2px;
      height: 2px;
      background: white;
      border-radius: 50%;
      animation: twinkle 2s infinite;
  }

  .star.large {
      width: 4px;
      height: 4px;
      box-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
  }

  .star.medium {
      width: 3px;
      height: 3px;
      box-shadow: 0 0 6px rgba(255, 255, 255, 0.6);
  }

  .star.small {
      width: 2px;
      height: 2px;
      box-shadow: 0 0 4px rgba(255, 255, 255, 0.4);
  }

  @keyframes twinkle {

      0%,
      100% {
          opacity: 0.3;
          transform: scale(1);
      }

      50% {
          opacity: 1;
          transform: scale(1.2);
      }
  }

  .star:nth-child(2n) {
      animation-delay: 0.5s;
  }

  .star:nth-child(3n) {
      animation-delay: 1s;
  }

  .star:nth-child(4n) {
      animation-delay: 1.5s;
  }

  .star:nth-child(5n) {
      animation-delay: 0.8s;
  }

  .star:nth-child(6n) {
      animation-delay: 1.2s;
  }


  .copyright {
      position: fixed;
      bottom: 10px;
      right: 15px;
      font-size: 13px;
      color: rgba(255, 255, 255, 0.3);
      font-family: 'Arial', sans-serif;
      z-index: 5000;
      pointer-events: none;
      text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
      user-select: none;
      transition: opacity 0.3s ease;
  }

  .copyright a {
      color: rgba(255, 255, 255, 0.4);
      font-weight: 600;
  }

  .copyright:hover {
      opacity: 0.8;
  }

 

  /* Settings hint styling */
  .settings-hint {
      position: fixed;
      top: 70px;
      right: 90px;
      z-index: 10002;
      display: flex;
      align-items: center;
      gap: 8px;
      opacity: 0;
      animation: showHint 3s ease-in-out forwards;
      pointer-events: none;
  }

  .hint-text {
      background: rgba(0, 0, 0, 0.8);
      color: white;
      padding: 8px 12px;
      border-radius: 20px;
      font-size: 14px;
      font-weight: 500;
      white-space: nowrap;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  }

  @keyframes showHint {
      0% {
          opacity: 0;
          transform: translateY(-10px);
      }
      20% {
          opacity: 1;
          transform: translateY(0);
      }
      80% {
          opacity: 1;
          transform: translateY(0);
      }
      100% {
          opacity: 0;
          transform: translateY(-10px);
      }
  }

  /* Color theme buttons styling */
  .color-theme-buttons {
      display: flex;
      gap: 8px;
      margin-top: 10px;
      flex-wrap: nowrap;
      justify-content: space-between;
  }

  .color-theme-btn {
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 10px 8px;
      border: 2px solid #e0e0e0;
      border-radius: 8px;
      background: white;
      cursor: pointer;
      transition: all 0.3s ease;
      flex: 1;
      min-width: 0;
      text-align: center;
  }

  .color-theme-btn:hover {
      border-color: #ff6b6b;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(255, 107, 107, 0.2);
  }

  .color-theme-btn.active {
      border-color: #ff6b6b;
      background: #fff5f5;
      box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
  }

  .color-preview {
      width: 25px;
      height: 25px;
      border-radius: 50%;
      margin-bottom: 8px;
      border: 2px solid #fff;
      box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  }

  .pink-preview {
      background: linear-gradient(135deg, #ff69b4, #ff1493);
  }

  .blue-preview {
      background: linear-gradient(135deg, #87ceeb, #4169e1);
  }

  .purple-preview {
      background: linear-gradient(135deg, #dda0dd, #9370db);
  }

  .custom-preview {
      background: linear-gradient(135deg, #ffb6c1, #ffc0cb, #d39b9b);
  }

  .color-theme-btn span {
      font-size: 12px;
      font-weight: 500;
      color: #fdfdfd;
  }

  .color-theme-btn.active span {
      color: #ff6b6b;
      font-weight: 600;
  }

  /* CSS cho Phong Thư */
  #envelopeContainer {
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 100000;
  }

  .letter {
      position: relative;
      z-index: 1;
  }

  .valentines {
      position: relative;
      top: 50px;
      cursor: pointer;
      animation: up 3s linear infinite;
      pointer-events: auto;
      z-index: 20;
      min-width: 300px;
      min-height: 200px;
  }

  .envelope-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 300px;
      height: 200px;
      z-index: 25;
      pointer-events: auto;
      background: transparent;
  }

  @keyframes up {
      0%,
      100% {
          transform: translateY(0);
      }
      50% {
          transform: translateY(-30px);
      }
  }

  .envelope {
      position: relative;
      width: 300px;
      height: 200px;
      background-color: #f08080;
      z-index: 2;
      pointer-events: auto;
  }

  .envelope:before {
      background-color: #f08080;
      content: "";
      position: absolute;
      width: 212px;
      height: 212px;
      transform: rotate(45deg);
      top: -105px;
      left: 44px;
      border-radius: 30px 0 0 0;
  }

  .card {
      position: absolute;
      background-color: #eae2b7;
      width: 270px;
      height: 170px;
      top: 5px;
      left: 15px;
      box-shadow: -5px -5px 100px rgba(0, 0, 0, 0.4);
      transition: top 0.5s ease;
      cursor: pointer;
      z-index: 2;
  }

  /* Vùng click mở rộng cho card */
  .card::after {
      content: "";
      position: absolute;
      top: -50px;
      left: -50px;
      right: -50px;
      bottom: -50px;
      z-index: 1;
      cursor: pointer;
      pointer-events: auto;
  }

  .card:before {
      content: "";
      position: absolute;
      border: 3px solid #003049;
      border-style: dotted;
      width: 240px;
      height: 140px;
      left: 12px;
      top: 12px;
  }

  .text {
      position: absolute;
      font-family: 'Brush Script MT', cursive;
      font-size: 30px;
      text-align: center;
      line-height: 25px;
      top: 19px;
      left: 85px;
      color: #003049;
  }

  .heart {
      background-color: #d62828;
      display: inline-block;
      height: 30px;
      margin: 0 10px;
      position: relative;
      top: 110px;
      left: 105px;
      transform: rotate(-45deg);
      width: 30px;
  }

  .heart:before,
  .heart:after {
      content: "";
      background-color: #d62828;
      border-radius: 50%;
      height: 30px;
      position: absolute;
      width: 30px;
  }

  .heart:before {
      top: -15px;
      left: 0;
  }

  .heart:after {
      left: 15px;
      top: 0;
  }

  .hearts {
      position: absolute;
      top: 0;
  }

  .one,
  .two,
  .three,
  .four,
  .five {
      background-color: red;
      display: inline-block;
      height: 10px;
      margin: 0 10px;
      position: relative;
      transform: rotate(-45deg);
      width: 10px;
      top: 50px;
  }

  .one:before,
  .one:after,
  .two:before,
  .two:after,
  .three:before,
  .three:after,
  .four:before,
  .four:after,
  .five:before,
  .five:after {
      content: "";
      background-color: red;
      border-radius: 50%;
      height: 10px;
      position: absolute;
      width: 10px;
  }

  .one:before,
  .two:before,
  .three:before,
  .four:before,
  .five:before {
      top: -5px;
      left: 0;
  }

  .one:after,
  .two:after,
  .three:after,
  .four:after,
  .five:after {
      left: 5px;
      top: 0;
  }

  .one {
      left: 10px;
      animation: heart 1s ease-out infinite;
  }

  .two {
      left: 30px;
      animation: heart 2s ease-out infinite;
  }

  .three {
      left: 50px;
      animation: heart 1.5s ease-out infinite;
  }

  .four {
      left: 70px;
      animation: heart 2.3s ease-out infinite;
  }

  .five {
      left: 90px;
      animation: heart 1.7s ease-out infinite;
  }

  @keyframes heart {
      0% {
          transform: translateY(0) rotate(-45deg) scale(0.3);
          opacity: 1;
      }
      100% {
          transform: translateY(-150px) rotate(-45deg) scale(1.3);
          opacity: 0.5;
      }
  }

  .front {
      position: absolute;
      border-right: 180px solid #f4978e;
      border-top: 95px solid transparent;
      border-bottom: 100px solid transparent;
      left: 120px;
      top: 5px;
      width: 0;
      height: 0;
      z-index: 3;
      pointer-events: none !important;
  }

  .front:before {
      position: absolute;
      content: "";
      border-left: 300px solid #f8ad9d;
      border-top: 195px solid transparent;
      left: -120px;
      top: -95px;
      width: 0;
      height: 0;
      pointer-events: none;
  }

  .shadow {
      position: absolute;
      width: 330px;
      height: 25px;
      border-radius: 50%;
      background-color: rgba(0, 0, 0, 0.3);
      top: 265px;
      left: -15px;
      animation: scale 3s linear infinite;
      z-index: -1;
  }

  @keyframes scale {
      0%,
      100% {
          transform: scaleX(1);
      }
      50% {
          transform: scaleX(0.85);
      }
  }

  /* CSS cho Gallery Ảnh Bay */
  #photoGallery {
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      z-index: 10001;
      overflow: hidden;
      background: rgba(0, 0, 0, 0.3);
      backdrop-filter: blur(2px);
  }

  .flying-photo {
      position: absolute;
      max-width: 400px;
      max-height: 400px;
      border-radius: 20px;
      overflow: visible;
      box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5),
                  0 0 20px rgba(255, 255, 255, 0.3),
                  0 0 40px rgba(255, 255, 255, 0.2),
                  0 0 60px rgba(255, 255, 255, 0.1);
      /* Animation sẽ được set động qua JavaScript */
      opacity: 0;
      filter: brightness(1.05);
      cursor: pointer;
      transition: box-shadow 0.3s ease, filter 0.3s ease;
      z-index: 1;
      display: flex;
      align-items: center;
      justify-content: center;
  }

  .flying-photo:hover {
      z-index: 10;
      box-shadow: 0 15px 50px rgba(0, 0, 0, 0.6),
                  0 0 30px rgba(255, 255, 255, 0.4),
                  0 0 50px rgba(255, 255, 255, 0.3),
                  0 0 70px rgba(255, 255, 255, 0.2);
      filter: brightness(1.15);
  }

  .flying-photo img {
      max-width: 100%;
      max-height: 100%;
      width: auto;
      height: auto;
      object-fit: contain;
      border-radius: 20px;
      filter: brightness(1.02);
      transition: filter 0.3s ease;
      display: block;
  }

  .flying-photo:hover img {
      filter: brightness(1.1);
  }

  @keyframes glowPulse {
      0%, 100% {
          box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5),
                      0 0 20px rgba(255, 255, 255, 0.3),
                      0 0 40px rgba(255, 255, 255, 0.2),
                      0 0 60px rgba(255, 255, 255, 0.1);
      }
      50% {
          box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5),
                      0 0 30px rgba(255, 255, 255, 0.4),
                      0 0 60px rgba(255, 255, 255, 0.3),
                      0 0 90px rgba(255, 255, 255, 0.15);
      }
  }

  @keyframes flyAcross {
      0% {
          left: -350px;
          opacity: 0;
          transform: rotate(-5deg) scale(0.8);
      }
      5% {
          opacity: 1;
      }
      50% {
          transform: rotate(0deg) scale(1);
      }
      95% {
          opacity: 1;
      }
      100% {
          left: 100vw;
          opacity: 0;
          transform: rotate(5deg) scale(0.8);
      }
  }

  /* Animation delay sẽ được set động qua JavaScript */
  .flying-photo {
      animation-delay: 0s;
      animation-duration: 12s;
  }

  /* Responsive cho mobile */
  @media (max-width: 480px) {
      .flying-photo {
          max-width: 200px;
          max-height: 280px;
      }

      /* Responsive cho Photo Preview trên mobile portrait - Gọn gàng */
      .photo-preview {
          width: 60px !important;
          height: 60px !important;
      }

      .photo-preview-img {
          width: 60px !important;
          height: 60px !important;
      }

      .remove-photo-btn {
          width: 14px !important;
          height: 14px !important;
          font-size: 9px !important;
          top: -5px !important;
          right: -5px !important;
          background: #f44336 !important;
          min-width: 14px !important;
          min-height: 14px !important;
      }

      #photoGallerySettings {
          gap: 6px !important;
      }

      #photoFileInput {
          padding: 6px !important;
          font-size: 13px !important;
      }
  }

  /* CSS cho Lá Thư */
  .wrapperLetterForm {
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      z-index: 10000;
      background: rgba(0, 0, 0, 0.2);
      display: none;
      backdrop-filter: blur(1px);
  }

  .boxLetter {
      width: 100%;
      height: 100%;
      display: flex;
      justify-content: center;
      align-items: center;
  }

  .boxLetter .formLetter {
      position: relative;
      width: 600px;
      height: 350px;
      background-color: #FFEBEB;
      border-radius: 20px;
      z-index: 100;
      padding: 20px 15px;
      box-shadow: rgba(0, 0, 0, 0.24) 0px 3px 8px;
  }

  .formLetter .wrapperLetter {
      position: relative;
      width: 100%;
      height: 100%;
      border: 2px dashed #FF6666;
      border-radius: inherit;
      display: flex;
  }

  .boxLetter .before {
      position: absolute;
      width: 600px;
      height: 350px;
      background: #fff;
      transform: rotate(-15deg);
      border-radius: 20px;
      z-index: 10;
  }

  .formLetter .heartLetter {
      position: absolute;
      width: 30px;
      height: 30px;
      border-radius: 50%;
      background: #FFEBEB;
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 10;
  }

  .heartLetter .heartLetterItem {
      position: relative;
      width: 10px;
      height: 10px;
      transform: rotate(45deg);
      background: #FF6666;
  }

  .heartLetter:first-child {
      right: 5px;
      top: 10px;
  }

  .heartLetter:nth-child(2) {
      left: 5px;
      bottom: 10px;
  }

  .heartLetterItem::before,
  .heartLetterItem::after {
      position: absolute;
      content: '';
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background: inherit;
  }

  .heartLetterItem::before {
      top: -50%;
  }

  .heartLetterItem::after {
      left: -50%;
  }

  .giftbox {
      position: relative;
      width: 40%;
      height: 100%;
  }

  .giftbox .img {
      position: absolute;
      width: 160px;
      bottom: -10px;
      left: 0px;
      z-index: 100;
  }

  .giftbox img {
      width: 100%;
  }

  .textLetter {
      width: 100%;
      flex-direction: column;
      justify-content: center;
      display: flex;
      align-items: center;
      user-select: none;
  }

  .textLetter h2 {
      font-size: 30px;
      font-weight: 700;
      font-family: 'Dancing Script', cursive;
  }

  .textLetter .contentLetter {
      font-size: 19px;
      text-align: center;
      padding: 0px 30px;
      margin-top: 10px;
      margin-bottom: 30px;
      font-family: 'Dancing Script', cursive;
      position: initial;
      word-break: break-word;
      overflow-wrap: anywhere;
      white-space: pre-wrap;
      overflow-y: auto;
      -webkit-overflow-scrolling: touch;
  }

  .fa-xmark {
      position: absolute;
      right: 20px;
      top: 10%;
      color: #fff;
      cursor: pointer;
      font-size: 25px;
      z-index: 200;
  }

  .close-arrow-btn {
      position: absolute;
      right: 8px;
      bottom: 20px;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background-color: #FF6666;
      border: none;
      color: #fff;
      cursor: pointer;
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 200;
      z-index: 2000;
      transition: transform 0.2s ease, background-color 0.2s ease;
      box-shadow: 0 2px 8px rgba(255, 102, 102, 0.3);
  }

  .close-arrow-btn i {
      font-size: 18px;
  }

  .close-arrow-btn:hover {
      transform: scale(1.1);
      background-color: #ff4444;
  }

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

  .heartAnimation {
      position: absolute;
      width: 150px;
      bottom: 0;
  }

  .heartAnimation img {
      width: 100%;
  }

  .mewmew1,
  .mewmew2 {
      position: absolute;
      width: 90px;
  }

  .mewmew1 {
      bottom: 0;
      left: 0;
  }

  .mewmew2 {
      bottom: 0;
      right: 0;
  }

  .mewmew1 img,
  .mewmew2 img {
      width: 100%;
  }

  .signature {
      position: absolute;
      bottom: 10px;
      right: 90px;
      font-weight: 700;
      font-family: 'Dancing Script', cursive;
      font-size: 20px;
      color: #FF6666;
      font-style: italic;
      text-align: right;
      z-index: 5;
  }

  /* Tối ưu cho điện thoại */
  @media (max-width: 480px) {
      .boxLetter .formLetter {
          width: 92vw;
          height: 55vh;
          max-height: 60vh;
      }

      .formLetter .wrapperLetter {
          overflow: hidden;
      }

      /* .giftbox {
          display: none;
      } */

      .textLetter {
          padding: 6px 4px;
          width: 100%;
          height: 100%;
          display: flex;
          flex-direction: column;
          justify-content: flex-start;
          align-items: center;
      }

      .textLetter h2 {
          font-size: 24px;
          flex-shrink: 0;
          margin-bottom: 5px;
      }

      .textLetter .contentLetter {
          font-size: 16px;
          flex: 1 1 auto;
          width: 100%;
          overflow-y: auto;
          -webkit-overflow-scrolling: touch;
          padding: 0 12px;
          margin-bottom: 24px;
          min-height: 0;
      }

      .heartAnimation {
          position: absolute;
          width: 120px;
          bottom: 20px;
          left: 50%;
          transform: translateX(-50%);
          z-index: 1;
      }

      .signature {
          right: 70px;
          bottom: 8px;
          font-size: 16px;
      }
  }

  @media screen and (max-height: 500px) and (orientation: landscape) {
    .music-control {
        width: 35px;
        height: 35px;
        font-size: 18px;
        top: 10px;
        right: 10px;
    }

    .settings-button {
        width: 35px;
        height: 35px;
        font-size: 18px;
        top: 10px;
        right: 65px;
    }

    .modal-content {
        width: 89%;
        height: 88vh;
        padding-bottom: 0px;

    }

    #settingsModal .modal-header {
        position: static !important;
        /* Không sticky/fixed */
        background: none !important;
        /* Bỏ background */
        padding: 0px 8px !important;
        /* Giảm padding */
        min-height: 0 !important;
        height: auto !important;
        flex-direction: row !important;
        justify-content: flex-end !important;
        align-items: center !important;
        border-radius: 0 !important;
        box-shadow: none !important;
    }

    #settingsModal .modal-header h2 {
        display: none !important;
        /* Ẩn tiêu đề */
    }

    #settingsModal .close {
        font-size: 22px !important;
        color: #222 !important;
        margin: 0 !important;
        padding: 0 !important;
        width: 28px !important;
        height: 28px !important;
        line-height: 1 !important;
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
    }

    .modal-body {
        padding: 15px;
        overflow-y: auto;
        max-height: calc(90vh - 70px);
    }

    .settings-section {
        margin-bottom: 15px;
        padding: 10px;
    }

    .settings-section h3 {
        font-size: 16px;
        margin: 0 0 10px;
        padding-bottom: 5px;
    }

    .form-group {
        margin-bottom: 10px;
    }

    .form-group label {
        font-size: 13px;
        margin-bottom: 3px;
    }

    .form-group input[type="color"] {
        height: 30px;
    }

    .modal-content select,
    .modal-content input[type="text"],
    .modal-content input[type="file"],
    .modal-content input[type="color"],
    .modal-content textarea {
        padding: 6px;
        font-size: 13px;
        margin-bottom: 8px;
    }

    .modal-content textarea {
        min-height: 60px;
    }

    /* Responsive cho Photo Preview trên mobile landscape - Gọn gàng */
    .photo-preview {
        width: 50px !important;
        height: 50px !important;
    }

    .photo-preview-img {
        width: 50px !important;
        height: 50px !important;
    }

    .remove-photo-btn {
        width: 12px !important;
        height: 12px !important;
        font-size: 8px !important;
        top: -4px !important;
        right: -4px !important;
        background: #f44336 !important;
        min-width: 12px !important;
        min-height: 12px !important;
    }

    #photoGallerySettings {
        gap: 5px !important;
    }




    .settings-p {
        font-size: 12px;
    }

    /* Optimize form layout for landscape */
    .form-row {
        gap: 10px;
    }

    /* Ensure scrollable content */
    .modal-body {
        -webkit-overflow-scrolling: touch;
        scrollbar-width: thin;
    }

    /* Adjust page info section */
    .modal-body>div:first-child {
        padding: 8px;
        font-size: 12px;
    }

    /* Compact button styling */
    .apply-settings-btn {
        position: sticky;
        bottom: 0;
        background: linear-gradient(135deg, #b69f08, #181818) !important;
        border-radius: 20 !important;
        margin: 0 !important;
        padding: 7px !important;
        margin-bottom: 20px !important;
        width: 100% !important;
        position: static !important;

        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.2);
    }

    .copyright {
        bottom: 5px;
        right: 10px;
        font-size: 8px;
    }

    #pricingContainer {
        position: fixed !important;
        left: 0 !important;
        right: 0 !important;
        bottom: 0 !important;
        border-radius: 15px 15px 0 0 !important;
        height: 70vh !important;
        overflow-y: auto !important;
        padding-bottom: 0px !important;
        /* Để không che nút */
        z-index: 10000 !important;
    }

    .pricing-header span,
    strong {
        font-size: 12px !important;
    }

    #pricingDetails {
        font-size: 8px !important;
    }

    .pricing-tip label {
        font-size: 10px !important;
    }


    #voucherList {
        max-height: 60px !important;
        font-size: 10px !important;
        margin-bottom: 4px !important;
    }

    #voucherSection {
        padding-top: 4px !important;
        margin-top: 4px !important;
        font-size: 9px !important;
    }

    #voucherSection .voucher-item label {
        font-size: 10px !important;
    }

    #tipAmount {
        width: 55px !important;
        font-size: 11px !important;
        padding: 2px 4px !important;
        margin-left: 4px !important;
    }

    #totalPrice {
        font-size: 14px !important;
    }

    #actionButton {
        position: sticky;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        padding: 5px !important;
        z-index: 10001;
        border-radius: 0 0 8px 8px;
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.08);
        margin: 0;
    }

    #togglePricing {
        font-size: 14px !important;
        top: 2px !important;
        right: 2px !important;
        padding: 2px !important;
        border-radius: 2px !important;
    }

    #googleLoginBtn {
        font-size: 12px !important;
        padding: 6px 10px !important;
        min-width: 90px !important;
        height: 32px !important;
        border-radius: 6px !important;
        margin-bottom: 6px !important;
    }

    #logoutBtn {
        font-size: 12px !important;
        padding: 2px 5px !important;
        min-width: 90px !important;
        height: 32px !important;
        border-radius: 6px !important;
        margin-bottom: 6px !important;
    }

    #userInfo {
        font-size: 11px !important;
        gap: 4px !important;
    }

    #paymentModal>div {
        width: 50vw !important;
        padding: 8px !important;
        border-radius: 8px !important;
        margin: 2vw auto !important;
    }

    #paymentModal iframe {
        height: 36vw !important;
        min-height: 36vw !important;
        max-height: 36vh !important;
    }

    #paymentModal button {
        top: 6px !important;
        right: 6px !important;
        font-size: 18px !important;
    }

    .success-notification-popup {
        max-width: 90vw !important;
        width: 90vw !important;
        padding: 10px !important;
        font-size: 13px !important;
        top: 50% !important;
        left: 50% !important;
        transform: translate(-50%, -50%) !important;
    }

    .success-notification-popup h3 {
        font-size: 14px !important;
        margin-bottom: 5px !important;
    }

    .success-notification-popup button {
        padding: 2px 5px !important;
        font-size: 13px !important;
    }

    /* Payment Method Section Responsive for Landscape Mobile */
    #paymentMethodSection {
        margin-top: 4px !important;
        padding-top: 4px !important;
    }

    #paymentMethodSection > div:first-child {
        margin-bottom: 4px !important;
    }

    #paymentMethodSection > div:first-child span {
        font-size: 10px !important;
    }

    #paymentMethodSection > div:first-child strong {
        font-size: 10px !important;
    }

    #paymentMethodSection > div:last-child {
        gap: 4px !important;
    }

    .payment-method-container {
        padding: 4px !important;
        border-radius: 4px !important;
    }

    .payment-method-container label {
        font-size: 9px !important;
    }

    .payment-method-container input[type="radio"] {
        transform: scale(1.0) !important;
        margin-right: 6px !important;
    }

    .payment-method-container strong {
        font-size: 9px !important;
    }

    .payment-method-container div[style*="font-size: 11px"] {
        font-size: 7px !important;
    }

    .payment-method-container img {
        width: 12px !important;
        height: 12px !important;
        margin-right: 4px !important;
    }

    .payment-method-container span[style*="font-size: 16px"] {
        font-size: 12px !important;
        margin-right: 4px !important;
    }

    /* Responsive cho Phong Thư trên mobile landscape */
    #envelopeContainer {
        padding: 10px !important;
    }

    .valentines {
        top: 0 !important;
        min-width: 200px !important;
        min-height: 130px !important;
        transform: scale(0.65) !important;
        animation: up 3s linear infinite !important;
    }

    .envelope {
        width: 200px !important;
        height: 130px !important;
    }

    .envelope:before {
        width: 141px !important;
        height: 141px !important;
        top: -70px !important;
        left: 29px !important;
    }

    .card {
        width: 180px !important;
        height: 113px !important;
        top: 3px !important;
        left: 10px !important;
    }

    .card:before {
        width: 160px !important;
        height: 93px !important;
        left: 8px !important;
        top: 8px !important;
        border-width: 2px !important;
    }

    .text {
        font-size: 20px !important;
        line-height: 18px !important;
        top: 12px !important;
        left: 57px !important;
    }

    .heart {
        width: 20px !important;
        height: 20px !important;
        top: 73px !important;
        left: 70px !important;
    }

    .heart:before,
    .heart:after {
        width: 20px !important;
        height: 20px !important;
    }

    .heart:before {
        top: -10px !important;
    }

    .heart:after {
        left: 10px !important;
    }

    .one,
    .two,
    .three,
    .four,
    .five {
        width: 7px !important;
        height: 7px !important;
        top: 33px !important;
    }

    .one:before,
    .one:after,
    .two:before,
    .two:after,
    .three:before,
    .three:after,
    .four:before,
    .four:after,
    .five:before,
    .five:after {
        width: 7px !important;
        height: 7px !important;
    }

    .one:before,
    .two:before,
    .three:before,
    .four:before,
    .five:before {
        top: -3.5px !important;
    }

    .one:after,
    .two:after,
    .three:after,
    .four:after,
    .five:after {
        left: 3.5px !important;
    }

    .one {
        left: 7px !important;
    }

    .two {
        left: 20px !important;
    }

    .three {
        left: 33px !important;
    }

    .four {
        left: 47px !important;
    }

    .five {
        left: 60px !important;
    }

    .front {
        border-right-width: 120px !important;
        border-top-width: 63px !important;
        border-bottom-width: 67px !important;
        left: 80px !important;
        top: 3px !important;
    }

    .front:before {
        border-left-width: 200px !important;
        border-top-width: 130px !important;
        left: -80px !important;
        top: -63px !important;
    }

    .shadow {
        width: 220px !important;
        height: 17px !important;
        top: 177px !important;
        left: -10px !important;
    }

    .envelope-overlay {
        width: 200px !important;
        height: 130px !important;
    }

    /* Responsive cho Lá Thư trên mobile landscape */
    .wrapperLetterForm {
        padding: 2px !important;
    }

    .boxLetter .formLetter {
        width: 78vw !important;
        max-width: 80vw !important;
        height: 59vh !important;
        max-height: 59vh !important;
        padding: 6px 5px !important;
        margin-bottom: 40px !important;
    }

    .formLetter .wrapperLetter {
        height: 100% !important;
        border-width: 1px !important;
        padding: 3px !important;
    }

    .boxLetter .before {
        width: 80vw !important;
        max-width: 80vw !important;
        height: 67vh !important;
        max-height: 67vh !important;
        margin-bottom: 40px !important;
        transform: rotate(-6deg) !important;
    }

    .giftbox {
       width: 25% !important;
       height: 100% !important;
    }
    .giftbox .img {
        position: absolute;
        width: 100px;
    }

    .textLetter {
        width: 100% !important;
        height: 100% !important;
        padding: 0 !important;
        justify-content: flex-start !important;
    }

    .textLetter h2 {
        font-size: 25px !important;
        margin-bottom: 2px !important;
        flex-shrink: 0 !important;
    }

    .textLetter .contentLetter {
        font-size: 16px !important;
        padding: 0 5px !important;
        margin-top: 3px !important;
        margin-bottom: 15px !important;
        flex: 1 1 auto !important;
        overflow-y: auto !important;
        -webkit-overflow-scrolling: touch !important;
        max-height: calc(70vh - 50px) !important;
        line-height: 1.4 !important;
    }

    .heartLetter {
        width: 15px !important;
        height: 15px !important;
    }

    .heartLetter .heartLetterItem {
        width: 5px !important;
        height: 5px !important;
    }

    .heartLetter:first-child {
        right: 2px !important;
        top: 3px !important;
    }

    .heartLetter:nth-child(2) {
        left: 2px !important;
        bottom: 3px !important;
    }

    .heartAnimation {
        width: 60px !important;
        bottom: 5px !important;
    }

    .mewmew1,
    .mewmew2 {
        width: 35px !important;
    }

    .signature {
        font-size: 12px !important;
        bottom: 3px !important;
        right: 40px !important;
    }

    .fa-xmark {
        font-size: 16px !important;
        right: 8px !important;
        top: 8px !important;
    }

    .close-arrow-btn {
        width: 25px !important;
        height: 25px !important;
        right: 3px !important;
        bottom: 2px !important;
    }

    .close-arrow-btn i {
        font-size: 12px !important;
    }

    /* Responsive cho Gallery Ảnh Bay trên mobile landscape */
    #photoGallery {
        background: rgba(0, 0, 0, 0.25) !important;
        backdrop-filter: blur(1px) !important;
    }

    .flying-photo {
        max-width: 150px !important;
        max-height: 150px !important;
        border-radius: 12px !important;
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4),
                    0 0 12px rgba(255, 255, 255, 0.25),
                    0 0 24px rgba(255, 255, 255, 0.15),
                    0 0 36px rgba(255, 255, 255, 0.08) !important;
    }

    .flying-photo:hover {
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5),
                    0 0 18px rgba(255, 255, 255, 0.3),
                    0 0 36px rgba(255, 255, 255, 0.2),
                    0 0 54px rgba(255, 255, 255, 0.12) !important;
    }

    .flying-photo img {
        border-radius: 12px !important;
    }

    /* Điều chỉnh animation cho nhanh hơn trên landscape */
    .flying-photo {
        animation-duration: 8s, 2s !important;
    }

    /* Điều chỉnh keyframe animation cho phù hợp với màn hình ngang */
    @keyframes flyAcrossLandscape {
        0% {
            left: -200px;
            opacity: 0;
            transform: rotate(-3deg) scale(0.7);
        }
        5% {
            opacity: 1;
        }
        50% {
            transform: rotate(0deg) scale(0.9);
        }
        95% {
            opacity: 1;
        }
        100% {
            left: 100vw;
            opacity: 0;
            transform: rotate(3deg) scale(0.7);
        }
    }

}