/* 共用玻璃圖卡設計系統：卡片 50% 透明，後面是 bg3d.js 的 3D 場景。 */
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;min-height:100dvh;background:linear-gradient(160deg,var(--bg),var(--bg2));background-attachment:fixed;color:var(--ink);font-family:"PingFang TC","Noto Sans TC","Microsoft JhengHei",system-ui,sans-serif;font-size:16px;line-height:1.7;overflow-x:hidden;-webkit-font-smoothing:antialiased}
h1,h2,h3{line-height:1.25;margin:0 0 .5em;letter-spacing:.01em;text-wrap:balance}
h1{font-size:clamp(2rem,7vw,3.6rem);font-weight:700}
h2{font-size:clamp(1.5rem,4.5vw,2.3rem);font-weight:700}
h3{font-size:1.15rem;font-weight:650}
p{margin:0 0 1em}
a{color:inherit}
.muted{color:var(--soft)}
.wrap{position:relative;z-index:1;width:min(1120px,100%);margin:0 auto;padding:0 16px}
.card{position:relative;background:var(--surface);-webkit-backdrop-filter:blur(18px) saturate(1.25);backdrop-filter:blur(18px) saturate(1.25);border:1px solid var(--line);border-radius:22px;padding:clamp(18px,3.5vw,32px);box-shadow:0 18px 50px -24px rgba(0,0,0,.35),inset 0 1px 0 rgba(255,255,255,.22)}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr))}
.stack{display:flex;flex-direction:column;gap:14px}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.section{padding:clamp(40px,8vw,84px) 0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 22px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:inherit;font-weight:600;text-decoration:none;cursor:pointer}
.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
label{display:flex;flex-direction:column;gap:6px;font-size:.92rem;color:var(--soft)}
input,select,textarea{width:100%;min-height:46px;padding:10px 14px;border-radius:12px;border:1px solid var(--line);background:var(--surface-solid);color:var(--ink);font:inherit;font-size:16px}
.chip{display:inline-flex;align-items:center;min-height:28px;padding:2px 12px;border-radius:999px;border:1px solid var(--line);font-size:.85rem;color:var(--soft)}
.chip-on{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.alert{padding:10px 14px;border-radius:12px;border:1px solid var(--line);background:var(--surface-solid)}
.hidden{display:none!important}
.scene{position:fixed;inset:0;z-index:0;overflow:hidden;perspective:1100px;pointer-events:none}
.slab{position:absolute;transform-style:preserve-3d;border-radius:18%;background:linear-gradient(140deg,var(--shape2),var(--shape1) 55%,var(--shape3));box-shadow:0 40px 80px -30px rgba(0,0,0,.45);animation:drift var(--t,24s) ease-in-out infinite alternate}
.slab::after{content:"";position:absolute;inset:0;border-radius:inherit;transform:translateZ(-26px);background:var(--shape3);opacity:.75}
.orb{position:absolute;border-radius:50%;background:radial-gradient(circle at 32% 28%,var(--shape2),var(--shape1) 48%,var(--shape3));box-shadow:0 30px 70px -25px rgba(0,0,0,.45);animation:float var(--t,18s) ease-in-out infinite alternate}
@keyframes drift{from{transform:translate3d(0,0,0) rotateX(var(--rx,48deg)) rotateY(var(--ry,-22deg)) rotateZ(var(--rz,18deg))}to{transform:translate3d(var(--dx,30px),var(--dy,-40px),60px) rotateX(calc(var(--rx,48deg) + 26deg)) rotateY(calc(var(--ry,-22deg) + 34deg)) rotateZ(calc(var(--rz,18deg) - 18deg))}}
@keyframes float{from{transform:translate3d(0,0,0)}to{transform:translate3d(var(--dx,24px),var(--dy,-36px),0)}}
@media (prefers-reduced-motion:reduce){.slab,.orb{animation:none}html{scroll-behavior:auto}}
@media (max-width:640px){.slab,.orb{opacity:.75}.card{border-radius:18px}}