:root {
        --bg: #fff;
        --text: #222;
        --accent: #111;
      }
      html,
      body {
        height: 100%;
        margin: 0;
        font-family: system-ui, -apple-system, Segoe UI, Roboto,
          "Helvetica Neue", Arial;
      }
      body {
        color: var(--text);
        background: var(--bg);
        opacity: 0;
        animation: fadeIn 0.3s ease-in-out forwards;
      }
      
      @keyframes fadeIn {
        from { opacity: 0; }
        to { opacity: 1; }
      }
      
      /* 雪花游標效果 */
      #snowflake-container {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        pointer-events: none;
        z-index: 9998;
      }
      
      .snowflake {
        position: absolute;
        color: #87CEEB;
        font-size: 1.2em;
        animation: snowfall 3s ease-out forwards;
        pointer-events: none;
        text-shadow: 0 0 8px rgba(135, 206, 235, 0.8), 0 0 15px rgba(255, 255, 255, 0.6);
        font-weight: bold;
        z-index: 9999;
      }
      
      @keyframes snowfall {
        0% {
          opacity: 1;
          transform: translateY(0px) translateX(0px) rotate(0deg) scale(1);
        }
        50% {
          opacity: 0.9;
          transform: translateY(60px) translateX(var(--random-x, 20px)) rotate(180deg) scale(1.1);
        }
        100% {
          opacity: 0;
          transform: translateY(150px) translateX(var(--random-x, 40px)) rotate(360deg) scale(0.3);
        }
      }
      /* header with hamburger */
      .site-header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        height: 64px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 20px;
        z-index: 900;
        background: transparent;
      }
      .brand {
        font-weight: 700;
        letter-spacing: 0.02em;
      }
      .hamburger {
        width: 44px;
        height: 44px;
        border: 0;
        background: transparent;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
      }
      .hamburger .bar {
        position: relative;
        width: 22px;
        height: 2px;
        background: var(--accent);
        transition: all 0.28s ease;
      }
      .hamburger .bar::before,
      .hamburger .bar::after {
        content: "";
        position: absolute;
        left: 0;
        width: 22px;
        height: 2px;
        background: var(--accent);
        transition: all 0.28s ease;
      }
      .hamburger .bar::before {
        top: -7px;
      }
      .hamburger .bar::after {
        top: 7px;
      }
      /* hero / banner */
      .hero {
        display: flex;
        align-items: center;
        justify-content: center;
        /* 讓 hero 區塊佔滿可視區（扣掉固定 header 64px） */
        height: calc(100vh - 64px);
        min-height: 320px;
        width: 100%;
        background: linear-gradient(
          180deg,
          rgba(0, 0, 0, 0.03),
          rgba(0, 0, 0, 0.01)
        );
        padding: 24px;
        box-sizing: border-box;
        margin-top: 64px; /* below fixed header */
        background-image: url("assets/banner.jpg");
        background-position: center;
        background-size: cover;
      }
      .hero .inner {
        max-width: 1100px;
        width: 100%;
        display: flex;
        gap: 40px;
        align-items: center;
        justify-content: space-between;
      }
      .hero .left {
        flex: 1;
      }
      .hero h1 {
        margin: 0 0 12px 0;
        font-size: 48px;
        line-height: 1.05;
        font-weight: 700;
        color: white;
      }
      .hero p {
        margin: 0 0 18px 0;
        color: white;
        max-width: 60ch;
      }
      .hero .cta {
        display: inline-block;
        background: var(--accent);
        color: #fff;
        padding: 12px 18px;
        text-decoration: none;
        font-weight: 600;
      }
      .hero .visual {
        width: 320px;
        height: 200px;
        /* hero.jpg 放在與 index.html 相同資料夾，或改成 assets/hero.jpg */
        background-image: url("hero.jpg");
        background-size: cover;
        background-position: center;
        box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
        flex-shrink: 0;
      }
      /* overlay full-screen menu */
      .overlay {
        position: fixed;
        inset: 0;
        background: var(--bg);
        z-index: 1000;
        display: flex;
        align-items: center;
        justify-content: center;
        transform: translateX(100%);
        transition: transform 0.36s cubic-bezier(0.2, 0.9, 0.2, 1);
        will-change: transform;
        padding: 40px;
      }
      .overlay.open {
        transform: translateX(0);
      }
      .overlay .menu {
        max-width: 1000px;
        width: 100%;
        display: flex;
        gap: 60px;
        align-items: flex-start;
        justify-content: space-between;
      }
      .menu .col {
        flex: 1;
      }
      .menu .links {
        list-style: none;
        padding: 0;
        margin: 0;
      }
      .menu .links li {
        margin: 18px 0;
      }
      .menu .links a {
        font-size: 48px;
        font-weight: 600;
        color: var(--text);
        text-decoration: none;
        line-height: 1;
      }
      .overlay .meta {
        max-width: 360px;
      }
      .overlay .close {
        position: absolute;
        top: 18px;
        right: 18px;
        border: 0;
        background: transparent;
        padding: 10px;
        cursor: pointer;
        font-size: 20px;
      }
      /* hamburger -> X animation when open */
      body.nav-open .hamburger .bar {
        background: transparent;
      }
      body.nav-open .hamburger .bar::before {
        transform: translateY(7px) rotate(45deg);
      }
      body.nav-open .hamburger .bar::after {
        transform: translateY(-7px) rotate(-45deg);
      }
      /* prevent background scroll when open */
      body.nav-open {
        overflow: hidden;
      }
      /* responsive */
      @media (max-width: 700px) {
        /* 手機版讓 hero 仍佔滿可視高度並把內容垂直置中 */
        .hero {
          height: calc(100vh - 64px);
          min-height: 280px;
          padding: 20px;
          margin-top: 64px;
        }
        .hero .inner {
          flex-direction: column;
          align-items: center;      /* 水平置中 */
          justify-content: center;  /* 垂直置中 */
          gap: 16px;
          text-align: center;       /* 文字置中 */
          width: 100%;
        }
         .hero .visual {
           width: 100%;
           height: 160px;
         }
         .menu {
           flex-direction: column;
           align-items: flex-start;
           gap: 20px;
         }
         .menu .links a {
           font-size: 36px;
         }
       }

       /* 3x3 圖片網格樣式 */
       .gallery-section {
         padding: 60px 20px;
         background: #f8f9fa;
       }

       .gallery-section .container {
         max-width: 1200px;
         margin: 0 auto;
       }

       .gallery-section h2 {
         text-align: center;
         margin-bottom: 40px;
         font-size: 28px;
         color: var(--text);
       }

       .image-grid {
         display: grid;
         grid-template-columns: repeat(3, 1fr);
         gap: 20px;
         max-width: 900px;
         margin: 0 auto;
       }

       .grid-item {
         display: flex;
         flex-direction: column;
         background: white;
         overflow: hidden;
         box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
         transition: transform 0.3s ease, box-shadow 0.3s ease;
       }

       .grid-item:hover {
         transform: translateY(-5px);
         box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
       }

       .image-container {
         aspect-ratio: 1;
         overflow: hidden;
         position: relative;
       }

       .grid-item img {
         width: 100%;
         height: 100%;
         object-fit: cover;
         transition: transform 0.3s ease;
       }

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

       .ice-name {
         padding: 12px 16px;
         margin: 0;
         font-size: 16px;
         font-weight: 600;
         color: var(--text);
         text-align: center;
         background: white;
         border-top: 1px solid #f0f0f0;
       }

       /* 響應式設計 */
       @media (max-width: 768px) {
         .image-grid {
           grid-template-columns: repeat(2, 1fr);
           gap: 15px;
         }

         .gallery-section {
           padding: 40px 15px;
         }

         .gallery-section h2 {
           font-size: 24px;
           margin-bottom: 30px;
         }
       }

       @media (max-width: 480px) {
         .image-grid {
           grid-template-columns: 1fr;
           gap: 12px;
         }

         .gallery-section {
           padding: 30px 10px;
         }
       }