:root {
    --bg: #ffffff;
    --text: #1a1a1a;
    --subtext: #4d4d4d;
    --border: #e5e5e5;
    --shadow: 0 8px 24px rgba(0,0,0,0.12);
    --shadow-heavy: 0 20px 48px rgba(0,0,0,0.16);
    --overlay: rgba(0, 0, 0, 0.4);
    --accent: #0078d4;
  }
  
  * { box-sizing: border-box; }
  html, body { height: 100%; }
  body {
    margin: 0;
    background: linear-gradient(135deg, #f0f4f8 0%, #e8eef5 50%, #dfe7f0 100%);
    color: var(--text);
    font-family: "Noto Sans SC", Segoe UI, system-ui, -apple-system, Roboto, Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    overflow: hidden;
  }
  
  #popup-layer {
    position: fixed;
    inset: 0;
    pointer-events: none; 
  }
  

  .modal-backdrop {
    position: fixed;
    inset: 0;
    background: #ffffff;
    display: grid;
    place-items: center;
    z-index: 9999;
  }
  
  .modal {
    width: min(92vw, 420px);
    background: #ffffff;
    border: none;
    border-radius: 12px;
    box-shadow: none;
    text-align: center;
    overflow: hidden;
    padding: 32px 24px 28px;
    animation: modal-appear 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
  }
  
  .modal-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 12px;
  }
  
  .modal-header .gift-icon {
    font-size: 24px;
    line-height: 1;
  }
  
  .modal-title {
    margin: 0;
    font-size: 25px;
    font-weight: 600;
    color: #497dd5;
    line-height: 1.4;
  }
  
  .modal-subtitle {
    font-size: 16px;
    color: #2b2d31bd;
    margin-bottom: 20px;
    line-height: 1.5;
  }
  
  .modal-tip {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-bottom: 24px;
    font-size: 13px;
    color: #858585d9;
  }
  
  .modal-tip .tip-icon {
    font-size: 16px;
  }
  
  .modal-tip .tip-text {
    line-height: 1.4;
  }
  
  .modal-actions {
    display: flex;
    justify-content: center;
  }
  
  .btn-start {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    padding: 0 32px;
    border-radius: 20px;
    border: 1px solid #e2e8f0;
    background: #ffffff;
    color: #497dd5;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.2px;
    transition: all 0.2s ease;
  }
  
  .btn-start:hover {
    background: #f7fafc;
    border-color: #cbd5e0;
  }
  
  .btn-start:active {
    transform: scale(0.98);
  }
  
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 36px;
    padding: 0 14px;
    border-radius: 4px;
    border: 1px solid var(--border);
    cursor: pointer;
    font-weight: 600;
    letter-spacing: .2px;
    background: #f7f7f7;
  }
  
  .btn.primary { background: var(--accent); color: #fff; border-color: #0a6ecf; }
  .btn:hover { filter: brightness(0.98); }
  .btn.primary:hover { filter: brightness(1.05); }
  .btn:active { transform: translateY(1px); }
  

  .popup {
    position: absolute;
    width: 120px;
    height: 58px;
    color: var(--text);
    background: #ffffff;
    border-radius: 5px;
    border: 1px solid var(--border);
    box-shadow: 0 2px 8px rgba(255,105,135,0.4);
    font-size: 13px;
    line-height: 1.3;
    pointer-events: none;
    user-select: none;
    transform-origin: center;
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }
  
  .popup .header {
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 2px 4px;
    background: #f3f3f3;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
  }
  .popup .header .icon { font-size: 10px; }
  .popup .header .title { font-weight: 800; font-size: 9px; }
  
  .popup .content { 
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2px 4px;
    color: var(--text);
    font-size: 13px;
    font-weight: 700;
    line-height: 1.3;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    word-break: break-word;
  }
  

  .popup.theme-blue .header { background: #e3f2fd; border-bottom-color: #bbdefb; }
  .popup.theme-blue .content { background: #f1f8ff; }
  
  .popup.theme-green .header { background: #e8f5e9; border-bottom-color: #c8e6c9; }
  .popup.theme-green .content { background: #f1f8f4; }
  
  .popup.theme-orange .header { background: #fff3e0; border-bottom-color: #ffe0b2; }
  .popup.theme-orange .content { background: #fffaf3; }
  
  .popup.theme-purple .header { background: #f3e5f5; border-bottom-color: #e1bee7; }
  .popup.theme-purple .content { background: #faf5fc; }
  
  .popup.theme-pink .header { background: #fce4ec; border-bottom-color: #f8bbd0; }
  .popup.theme-pink .content { background: #fff0f5; }
  
  .popup.theme-yellow .header { background: #fffde7; border-bottom-color: #fff9c4; }
  .popup.theme-yellow .content { background: #fffef7; }
  
  .popup.theme-cyan .header { background: #e0f7fa; border-bottom-color: #b2ebf2; }
  .popup.theme-cyan .content { background: #f0fcff; }
  
  .popup.theme-lime .header { background: #f9fbe7; border-bottom-color: #f0f4c3; }
  .popup.theme-lime .content { background: #fdfef8; }
  
  .popup.theme-red .header { background: #ffebee; border-bottom-color: #ffcdd2; }
  .popup.theme-red .content { background: #fff5f5; }
  
  .popup.theme-teal .header { background: #e0f2f1; border-bottom-color: #b2dfdb; }
  .popup.theme-teal .content { background: #f0faf9; }
  
  .popup.theme-indigo .header { background: #e8eaf6; border-bottom-color: #c5cae9; }
  .popup.theme-indigo .content { background: #f3f4fb; }
  
  .popup.theme-amber .header { background: #fff8e1; border-bottom-color: #ffecb3; }
  .popup.theme-amber .content { background: #fffef5; }
  
  .popup.theme-rose .header { background: #fce4ec; border-bottom-color: #f8bbd0; }
  .popup.theme-rose .content { background: #fef5f8; }
  
  .popup.theme-mint .header { background: #e8f8f5; border-bottom-color: #c8ebe3; }
  .popup.theme-mint .content { background: #f5fcfa; }
  
  .popup.theme-peach .header { background: #fff0e5; border-bottom-color: #ffe0c7; }
  .popup.theme-peach .content { background: #fffaf5; }
  
  .popup.theme-lavender .header { background: #f0ebf8; border-bottom-color: #ddd0f0; }
  .popup.theme-lavender .content { background: #f9f6fc; }
  
  .popup.theme-coral .header { background: #ffe4e1; border-bottom-color: #ffc4bd; }
  .popup.theme-coral .content { background: #fff7f6; }
  
  .popup.theme-sky .header { background: #e1f5fe; border-bottom-color: #b3e5fc; }
  .popup.theme-sky .content { background: #f0fbff; }
  
  .popup.theme-lemon .header { background: #fffef0; border-bottom-color: #fff9c8; }
  .popup.theme-lemon .content { background: #fffffa; }

  /* 掉落动画 */
  @keyframes popup-fall {
    0% {
      opacity: 1;
      transform: translateY(0) rotate(0deg) scale(1);
    }
    100% {
      opacity: 0;
      transform: translateY(150vh) rotate(720deg) scale(0.3);
    }
  }
  
  .popup.falling {
    animation: popup-fall 1s cubic-bezier(0.55, 0.085, 0.68, 0.53) forwards;
    pointer-events: none;
    z-index: 10001;
    transform-origin: center;
  }


  @media (max-width: 375px) {
    .popup { 
      width: 65px;
      height: 42px;
    }
    .popup .header {
      padding: 2px 3px;
      gap: 1px;
    }
    .popup .header .icon { font-size: 7px; }
    .popup .header .title { font-size: 6px; }
    .popup .content { 
      font-size: 10px; 
      padding: 2px 3px;
      font-weight: 800;
    }
  }
  
  @media (min-width: 376px) and (max-width: 480px) {
    .popup { 
      width: 75px;
      height: 46px;
    }
    .popup .header {
      padding: 2px 3px;
      gap: 1px;
    }
    .popup .header .icon { font-size: 8px; }
    .popup .header .title { font-size: 7px; }
    .popup .content { 
      font-size: 11px; 
      padding: 2px 3px;
      font-weight: 800;
    }
  }
  
  @media (min-width: 481px) and (max-width: 640px) {
    .popup { 
      width: 90px;
      height: 50px;
    }
    .popup .content { 
      font-size: 12px; 
      padding: 2px 4px;
      font-weight: 700;
    }
  }
  
  @media (min-width: 641px) and (max-width: 768px) {
    .popup { 
      width: 105px;
      height: 55px;
    }
    .popup .content { 
      font-size: 13px; 
      padding: 3px 4px;
      font-weight: 700;
    }
  }
  
  @media (min-width: 769px) and (max-width: 1024px) {
    .popup { 
      width: 120px;
      height: 58px;
    }
    .popup .content { 
      font-size: 13px;
      font-weight: 700;
    }
  }
  
  @media (min-width: 1025px) and (max-width: 1440px) {
    .popup { 
      width: 145px;
      height: 62px;
    }
    .popup .content { 
      font-size: 14px; 
      font-weight: 700;
    }
  }
  
  @media (min-width: 1441px) {
    .popup { 
      width: 165px;
      height: 68px;
    }
    .popup .content { 
      font-size: 15px; 
      font-weight: 700;
    }
  }
  

  @keyframes modal-appear {
    0% {
      opacity: 0;
      transform: scale(0.7) translateY(-20px);
    }
    100% {
      opacity: 1;
      transform: scale(1) translateY(0);
    }
  }

  @keyframes popup-from-top {
    0% {
      opacity: 0;
      transform: scale(0.3) translateY(-60px);
    }
    30% {
      opacity: 1;
      transform: scale(1.08) translateY(0);
    }
    60% {
      opacity: 1;
      transform: scale(1.08) translateY(0);
    }
    90% {
      transform: scale(0.95) translateY(0);
    }
    100% {
      opacity: 1;
      transform: scale(1) translateY(0);
    }
  }
  

  @keyframes popup-from-bottom {
    0% {
      opacity: 0;
      transform: scale(0.3) translateY(60px);
    }
    30% {
      opacity: 1;
      transform: scale(1.08) translateY(0);
    }
    60% {
      opacity: 1;
      transform: scale(1.08) translateY(0);
    }
    90% {
      transform: scale(0.95) translateY(0);
    }
    100% {
      opacity: 1;
      transform: scale(1) translateY(0);
    }
  }
  

  @keyframes popup-from-left {
    0% {
      opacity: 0;
      transform: translateX(-100vw) scale(0.8);
    }
    25% {
      opacity: 0.8;
    }
    35% {
      opacity: 1;
      transform: translateX(10px) scale(1.3);
    }
    58% {
      opacity: 1;
      transform: translateX(10px) scale(1.3);
    }
    92% {
      transform: translateX(-3px) scale(1.1);
    }
    100% {
      opacity: 1;
      transform: translateX(0) scale(1);
    }
  }
  

  @keyframes popup-from-right {
    0% {
      opacity: 0;
      transform: translateX(100vw) scale(0.8);
    }
    25% {
      opacity: 0.8;
    }
    35% {
      opacity: 1;
      transform: translateX(-10px) scale(1.3);
    }
    58% {
      opacity: 1;
      transform: translateX(-10px) scale(1.3);
    }
    92% {
      transform: translateX(3px) scale(1.1);
    }
    100% {
      opacity: 1;
      transform: translateX(0) scale(1);
    }
  }
  

  @keyframes popup-from-topleft {
    0% {
      opacity: 0;
      transform: scale(0.3) translate(-50px, -50px);
    }
    30% {
      opacity: 1;
      transform: scale(1.08) translate(0, 0);
    }
    60% {
      opacity: 1;
      transform: scale(1.08) translate(0, 0);
    }
    90% {
      transform: scale(0.95) translate(0, 0);
    }
    100% {
      opacity: 1;
      transform: scale(1) translate(0, 0);
    }
  }
  

  @keyframes popup-from-topright {
    0% {
      opacity: 0;
      transform: scale(0.3) translate(50px, -50px);
    }
    30% {
      opacity: 1;
      transform: scale(1.08) translate(0, 0);
    }
    60% {
      opacity: 1;
      transform: scale(1.08) translate(0, 0);
    }
    90% {
      transform: scale(0.95) translate(0, 0);
    }
    100% {
      opacity: 1;
      transform: scale(1) translate(0, 0);
    }
  }
  

  @keyframes popup-from-bottomleft {
    0% {
      opacity: 0;
      transform: scale(0.3) translate(-50px, 50px);
    }
    30% {
      opacity: 1;
      transform: scale(1.08) translate(0, 0);
    }
    60% {
      opacity: 1;
      transform: scale(1.08) translate(0, 0);
    }
    90% {
      transform: scale(0.95) translate(0, 0);
    }
    100% {
      opacity: 1;
      transform: scale(1) translate(0, 0);
    }
  }
  

  @keyframes popup-from-bottomright {
    0% {
      opacity: 0;
      transform: scale(0.3) translate(50px, 50px);
    }
    30% {
      opacity: 1;
      transform: scale(1.08) translate(0, 0);
    }
    60% {
      opacity: 1;
      transform: scale(1.08) translate(0, 0);
    }
    90% {
      transform: scale(0.95) translate(0, 0);
    }
    100% {
      opacity: 1;
      transform: scale(1) translate(0, 0);
    }
  }
  

  .anim-top { animation: popup-from-top 1.05s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }
  .anim-bottom { animation: popup-from-bottom 1.05s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }
  .anim-left { animation: popup-from-left 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards; }
  .anim-right { animation: popup-from-right 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards; }
  .anim-topleft { animation: popup-from-topleft 1.05s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }
  .anim-topright { animation: popup-from-topright 1.05s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }
  .anim-bottomleft { animation: popup-from-bottomleft 1.05s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }
  .anim-bottomright { animation: popup-from-bottomright 1.05s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }
  
  /* 爱心形状动画 - 从右边直接飞到爱心位置并停留展示 */
  @keyframes heart-fly-in {
    0% {
      opacity: 0;
      left: var(--start-left);
      top: var(--final-top);
      transform: scale(0.3) rotate(var(--rotation, 0deg));
    }
    /* 飞到�?终位�? */
    25% {
      opacity: 1;
      left: var(--final-left);
      top: var(--final-top);
      transform: scale(1.15) rotate(var(--rotation, 0deg));
    }
    /* 保持1.15�?1秒后（约58.33%处） */
    58.33% {
      opacity: 1;
      left: var(--final-left);
      top: var(--final-top);
      transform: scale(1.15) rotate(var(--rotation, 0deg));
    }
    /* �?100%处回到正常大�?1.0�? */
    100% {
      opacity: 1;
      left: var(--final-left);
      top: var(--final-top);
      transform: scale(1) rotate(var(--rotation, 0deg));
    }
  }
  
  .heart-anim {
    animation: heart-fly-in 3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    /* 动画结束后保持最终状�? */
    animation-fill-mode: forwards;
  }

  /* 收回动画 - 卡片移动到第�?个卡片位�? */
  @keyframes collect-card {
    0% {
      left: var(--current-left);
      top: var(--current-top);
      transform: scale(1) rotate(var(--current-rotation, 0deg));
      opacity: 1;
    }
    100% {
      left: var(--target-left);
      top: var(--target-top);
      transform: scale(0.8) rotate(0deg);
      opacity: 0.9;
    }
  }

  .collecting {
    animation: collect-card 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    animation-fill-mode: forwards;
    z-index: var(--collect-z-index, 10000);
  }

  /* 喷发动画 - 从中心点向屏幕各处飞�? */
  @keyframes explode-card {
    0% {
      left: var(--explode-start-x);
      top: var(--explode-start-y);
      transform: scale(0.8) rotate(0deg);
      opacity: 0.9;
    }
    100% {
      left: var(--explode-end-x);
      top: var(--explode-end-y);
      transform: scale(1.3) rotate(var(--explode-rotation, 0deg));
      opacity: 1;
    }
  }

  .exploding {
    animation: explode-card 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
    animation-fill-mode: forwards;
    z-index: 10001;
  }

  /* 呼吸灯阴影闪烁动�? */
  @keyframes shadow-breathe {
    0%, 100% {
      box-shadow: 0 2px 8px rgba(255, 105, 135, 0.4);
    }
    50% {
      box-shadow: 0 3px 12px rgba(255, 105, 135, 0.6);
    }
  }

  .shadow-breathing {
    animation: shadow-breathe 2s ease-in-out infinite;
  }
  

  #float-balls {
    position: fixed;
    right: 30px;
    bottom: 30px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 10000;
  }
  
  .float-ball {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    pointer-events: auto;
  }
  
  .float-ball span {
    color: #1a1a1a;
    font-size: 12px;
    font-weight: 600;
    text-align: center;
  }
  
  .float-ball:hover {
    background: rgba(255, 255, 255, 0.85);
    transform: scale(1.1);
    box-shadow: 0 6px 30px rgba(0, 0, 0, 0.25);
  }
  
  .float-ball:active {
    transform: scale(0.95);
  }
  

  @keyframes ball-appear {
    0% {
      opacity: 0;
      transform: scale(0) translateX(100px);
    }
    60% {
      opacity: 1;
      transform: scale(1.15) translateX(0);
    }
    80% {
      transform: scale(0.9) translateX(0);
    }
    100% {
      opacity: 1;
      transform: scale(1) translateX(0);
    }
  }
  
  #float-balls.show .float-ball {
    animation: ball-appear 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
  }
  
  #float-balls.show .float-ball:nth-child(2) {
    animation-delay: 0.15s;
  }
  
  @media (max-width: 640px) {
    #float-balls {
      right: 20px;
      bottom: 20px;
      gap: 10px;
    }
    
    .float-ball {
      width: 40px;
      height: 40px;
    }
    
    .float-ball span {
      font-size: 11px;
    }
  }