/* --- 全域設定 --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Microsoft JhengHei', 'PingFang TC', sans-serif;
  background: linear-gradient(135deg, #2d2d44 0%, #3d3d5c 100%);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  overflow-y: auto;
}

/* --- 移動網格線（背景動畫） --- */
body::before {
  content: '';
  position: absolute;
  width: 200%;
  height: 200%;
  background-image: 
      linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: moveGrid 20s linear infinite;
  pointer-events: none;
}

@keyframes moveGrid {
  0% {
    transform: translate(0, 0) rotate(-15deg);
  }
  100% {
    transform: translate(50px, 50px) rotate(-15deg);
  }
}

/* --- 粒子效果 --- */
.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: rgba(255, 120, 150, 0.6);
  border-radius: 50%;
  animation: float 8s infinite;
}

/* 粒子位置與延遲 */
.particle:nth-child(1) { left: 10%; top: 20%; animation-delay: 0s; }
.particle:nth-child(2) { left: 80%; top: 40%; animation-delay: 2s; }
.particle:nth-child(3) { left: 30%; top: 60%; animation-delay: 4s; }
.particle:nth-child(4) { left: 90%; top: 80%; animation-delay: 6s; background: rgba(160, 120, 255, 0.6); }

@keyframes float {
  0%, 100% {
    transform: translateY(0) translateX(0);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-100px) translateX(30px);
    opacity: 0;
  }
}
html {
  scroll-behavior: smooth; /* 平滑滾動 */
  scroll-snap-type: y mandatory; /* 可選，增加一頁一頁感覺 */
}

section {
  scroll-snap-align: start; /* 每頁貼齊頂部 */
  min-height: 100vh;        /* 確保每頁都是滿版 */
}