/* The One AI Studio — Demo Day 2026
   視覺語言取自主視覺：全黑場域、一道由藍轉橙的光柱、極細線體 DEMO DAY。 */

:root {
  --bg: #030304;
  --bg-tint: #09090c;
  --panel: #0e0f13;
  --ink: #f5f1ec;
  --ink-2: #b9b3ab;
  --ink-3: #8f8981;
  --line: rgba(255, 255, 255, 0.11);
  --line-2: rgba(255, 255, 255, 0.2);
  --orange: #ff6b1a;
  --amber: #ffa53c;
  --blue: #1d5cff;
  --violet: #6a3ff0;
  --beam: linear-gradient(180deg, var(--blue) 0%, var(--violet) 32%, #e8552b 62%, var(--orange) 78%, var(--amber) 100%);
  --beam-x: linear-gradient(90deg, var(--blue) 0%, var(--violet) 30%, var(--orange) 72%, var(--amber) 100%);

  --display: "Montserrat", "Noto Sans TC", sans-serif;
  --sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --serif: "Noto Serif TC", "Songti TC", serif;

  --gutter: clamp(20px, 5vw, 72px);
  --max: 1240px;
  --nav-h: 64px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 12px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
/* 細微顆粒，讓大面積的黑不死板 */
body::after {
  content: "";
  position: fixed; inset: 0; z-index: 90; pointer-events: none; opacity: .07;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4, p, ul, ol, dl, dd, address { margin: 0; padding: 0; font-style: normal; }
ul, ol { list-style: none; }
h2, h3 { font-weight: 500; text-wrap: balance; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }

.skip { position: absolute; left: -999px; top: 8px; z-index: 200; background: var(--ink); color: #000; padding: 8px 14px; }
.skip:focus { left: 8px; }
.wrap { width: min(100% - var(--gutter) * 2, var(--max)); margin-inline: auto; }
.muted { color: var(--ink-3); }
.thin { font-weight: 300; color: var(--ink-2); }
br.lg { display: none; }
@media (min-width: 900px) { br.lg { display: inline; } }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .6em;
  padding: 14px 28px;
  background: linear-gradient(90deg, var(--orange), var(--amber));
  color: #140700; text-decoration: none;
  font-family: var(--sans); font-weight: 700; font-size: 15px; letter-spacing: .12em; line-height: 1;
  border-radius: 2px; white-space: nowrap;
  box-shadow: 0 0 0 rgba(255, 107, 26, 0);
  transition: box-shadow .3s, transform .3s;
}
.btn:hover { box-shadow: 0 0 34px rgba(255, 107, 26, .55); transform: translateY(-1px); }
.btn span { transition: transform .3s; }
.btn:hover span { transform: translateX(4px); }
.btn--sm { padding: 10px 18px; font-size: 13px; }
.btn--lg { padding: 20px 44px; font-size: 17px; }
.link { color: var(--ink-2); text-underline-offset: 5px; font-size: 14px; letter-spacing: .08em; }
.link:hover { color: var(--amber); }

/* ── Nav ── */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100; height: var(--nav-h);
  display: flex; align-items: center; gap: 32px;
  padding-inline: var(--gutter);
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s;
}
.nav.is-stuck { background: rgba(3, 3, 4, .78); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-color: var(--line); }
.nav__brand {
  display: flex; align-items: center; gap: 12px; margin-right: auto;
  font-family: var(--display); font-weight: 500; font-size: 13px; letter-spacing: .28em; text-decoration: none; white-space: nowrap;
}
.nav__beam { width: 5px; height: 26px; background: var(--beam); box-shadow: 0 0 14px rgba(255, 107, 26, .7); }
.nav__links { display: none; gap: 28px; }
.nav__links a { font-size: 14px; font-weight: 400; letter-spacing: .1em; color: var(--ink-2); text-decoration: none; transition: color .2s; }
.nav__links a:hover { color: var(--amber); }
@media (min-width: 980px) { .nav__links { display: flex; } }
@media (max-width: 520px) { .nav .btn { display: none; } }

/* ── Hero：直接使用主視覺原圖，整張等比縮放、不裁切 ── */
.hero { padding-top: var(--nav-h); background: #000; }
.hero__kv { width: 100%; height: auto; animation: fade-in 1.2s both; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.hero__bar {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px 40px;
  padding: 22px var(--gutter);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(3, 3, 4, .55), rgba(3, 3, 4, .9));
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  animation: fade-up .9s .95s both;
}
.facts { display: flex; flex-wrap: wrap; gap: 16px clamp(28px, 5vw, 72px); }
.facts dt { font-size: 12px; letter-spacing: .3em; color: var(--orange); font-weight: 500; }
.facts dd { font-size: 16px; font-weight: 400; line-height: 1.6; }
.facts small { display: block; font-size: 13px; color: var(--ink-3); font-weight: 300; }
.facts__partner dd { padding-top: 6px; }
.facts__partner img { height: 20px; width: auto; }
.facts__count dd { font-family: var(--display); font-variant-numeric: tabular-nums; letter-spacing: .06em; }

@media (max-width: 860px) {
  .hero__bar .btn { width: 100%; }
}

/* ── At a glance ── */
.glance { border-block: 1px solid var(--line); background: var(--bg-tint); }
.stats { display: grid; grid-template-columns: repeat(2, 1fr); width: min(100%, var(--max) + var(--gutter) * 2); margin-inline: auto; }
.stats li { padding: clamp(28px, 4vw, 52px) var(--gutter); border-left: 1px solid var(--line); }
.stats li:nth-child(odd) { border-left: 0; }
.stats li:nth-child(n+3) { border-top: 1px solid var(--line); }
.stats b {
  font-family: var(--display); font-weight: 200; font-size: clamp(54px, 7vw, 104px); line-height: 1; letter-spacing: -.01em;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(180deg, #fff 30%, var(--amber) 120%); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stats .unit { margin-left: 8px; font-size: 18px; color: var(--orange); font-weight: 500; }
.stats em { display: block; margin-top: 12px; font-style: normal; font-weight: 500; font-size: 17px; letter-spacing: .14em; }
.stats p { font-size: 14px; color: var(--ink-3); }
@media (min-width: 900px) {
  .stats { grid-template-columns: repeat(4, 1fr); }
  .stats li { padding-inline: clamp(20px, 2.6vw, 40px); }
  .stats li:nth-child(odd) { border-left: 1px solid var(--line); }
  .stats li:first-child { border-left: 0; }
  .stats li:nth-child(n+3) { border-top: 0; }
}

/* ── Shared section scaffolding ── */
.section { padding-block: clamp(80px, 11vw, 160px); position: relative; }
.section--tint { background: var(--bg-tint); border-block: 1px solid var(--line); }
.eyebrow { font-family: var(--display); font-weight: 500; font-size: 12px; letter-spacing: .32em; color: var(--orange); }
.eyebrow span { display: inline-flex; align-items: center; gap: 14px; }
.eyebrow span::before { content: ""; width: 3px; height: 22px; background: var(--beam); box-shadow: 0 0 10px rgba(255, 107, 26, .6); }
.head { max-width: 760px; margin-bottom: clamp(40px, 6vw, 80px); }
.head h2 { margin-top: 22px; font-size: clamp(30px, 4.4vw, 58px); line-height: 1.28; letter-spacing: .04em; }
.head__lead { margin-top: 22px; color: var(--ink-2); font-size: clamp(16px, 1.35vw, 18px); max-width: 60ch; }
.note { margin-top: 28px; font-size: 13px; color: var(--ink-3); }

/* ── Manifesto ── */
.manifesto { padding-block: clamp(96px, 13vw, 180px) clamp(24px, 4vw, 56px); position: relative; }
.manifesto::before { /* 一道橫向的光 */
  content: ""; position: absolute; left: 0; top: 0; width: min(38vw, 520px); height: 1px; background: var(--beam-x);
}
.manifesto__grid { display: grid; gap: 36px; }
.manifesto__quote {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(28px, 4.3vw, 60px); line-height: 1.5; letter-spacing: .03em;
}
.manifesto__quote mark {
  background: none; color: transparent;
  background-image: var(--beam-x); -webkit-background-clip: text; background-clip: text;
}
.manifesto__body { margin-top: clamp(32px, 4vw, 56px); display: grid; gap: 24px clamp(32px, 5vw, 72px); color: var(--ink-2); font-size: 17px; line-height: 2; }
@media (min-width: 900px) {
  .manifesto__grid { grid-template-columns: 220px 1fr; }
  .manifesto__body { grid-template-columns: 1fr 1fr; }
}

/* ── Highlights ── */
.cards { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.card { position: relative; background: var(--bg); padding: clamp(28px, 3.4vw, 48px); overflow: hidden; transition: background .4s; }
.card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--beam); transform: scaleY(0); transform-origin: bottom; transition: transform .5s cubic-bezier(.2, .7, .2, 1); }
.card:hover { background: #0b0a0a; }
.card:hover::before, .card--hot::before { transform: scaleY(1); }
.card--hot { background: radial-gradient(120% 90% at 0% 100%, rgba(255, 107, 26, .2), transparent 60%), var(--bg); }
.card__no { font-family: var(--display); font-weight: 200; font-size: 64px; line-height: 1; color: transparent; -webkit-text-stroke: 1px rgba(255, 165, 60, .75); }
.card h3 { margin-top: 28px; font-size: clamp(21px, 2vw, 26px); letter-spacing: .05em; line-height: 1.4; }
.card__en { margin: 6px 0 18px; font-family: var(--display); font-size: 11px; font-weight: 500; letter-spacing: .3em; color: var(--orange); }
.card p:last-child { color: var(--ink-2); font-size: 15.5px; }
@media (min-width: 900px) { .cards { grid-template-columns: repeat(3, 1fr); } }

.features { margin-top: 28px; display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 12px; }
.features li { display: flex; align-items: center; gap: 14px; padding: 16px 20px; border: 1px solid var(--line); font-weight: 400; font-size: 15px; letter-spacing: .04em; }
.features span { font-family: var(--display); font-size: 12px; font-weight: 600; color: var(--orange); width: 24px; height: 24px; display: grid; place-items: center; border: 1px solid rgba(255, 107, 26, .6); border-radius: 50%; flex: none; }

/* ── Split layouts ── */
.split { display: grid; gap: 24px clamp(40px, 7vw, 110px); align-items: start; }
@media (min-width: 980px) {
  .split { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); }
  .split--agenda { grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); }
  .split .head { position: sticky; top: calc(var(--nav-h) + 40px); margin-bottom: 0; }
}

/* ── Live PoC ── */
.poc li { display: flex; gap: clamp(20px, 3vw, 40px); align-items: baseline; padding: 26px 0; border-top: 1px solid var(--line); }
.poc li:last-child { border-bottom: 1px solid var(--line); }
.poc__no { font-family: var(--display); font-size: 13px; font-weight: 500; letter-spacing: .2em; color: var(--orange); }
.poc h3 { font-family: var(--display); font-weight: 400; font-size: clamp(22px, 2.4vw, 30px); letter-spacing: .03em; line-height: 1.3; }
.poc h3 small { font-family: var(--sans); font-size: 15px; font-weight: 400; color: var(--ink-2); margin-left: 10px; letter-spacing: .1em; }
.poc p { margin-top: 4px; color: var(--ink-2); }
.poc p.muted { color: var(--ink-3); }

/* ── Value chain + lineup ── */
@media (min-width: 640px) { .chain { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 980px) { .chain { grid-template-columns: repeat(3, 1fr); } }
.chain { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); counter-reset: c; }
.chain li { background: var(--bg); padding: 28px clamp(22px, 2.4vw, 34px) 32px; position: relative; }
.chain span { font-family: var(--display); font-size: 12px; font-weight: 500; letter-spacing: .24em; color: var(--orange); }
.chain h3 { margin: 10px 0 8px; font-size: 19px; letter-spacing: .05em; line-height: 1.5; }
.chain p { font-size: 14.5px; color: var(--ink-2); line-height: 1.75; }
.chain li::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--beam-x); transform: scaleX(0); transform-origin: left; transition: transform .5s cubic-bezier(.2, .7, .2, 1); }
.chain li:hover::after { transform: scaleX(1); }

.lineup { margin-top: clamp(56px, 7vw, 96px); }
.lineup__head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px 24px; margin-bottom: 24px; }
.lineup__head h3 { font-family: var(--display); font-weight: 300; font-size: clamp(20px, 2.4vw, 30px); letter-spacing: .2em; }
.lineup__head p { font-size: 14px; color: var(--ink-3); letter-spacing: .1em; }
.teams { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
@media (min-width: 720px) { .teams { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1080px) { .teams { grid-template-columns: repeat(5, 1fr); } }
.team {
  position: relative; aspect-ratio: 4 / 5; overflow: clip; align-self: stretch; /* 同一排卡片等高 */
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: clamp(64px, 6vw, 80px) 18px 18px; border: 1px solid var(--line); /* 上方留給編號；內容較多時卡片會自動長高 */
  background: linear-gradient(180deg, #0a0a0d 0%, #0a0a0d 45%, rgba(255, 107, 26, .16) 100%);
  transition: border-color .3s, transform .4s cubic-bezier(.2, .7, .2, 1);
}
.team:hover { border-color: rgba(255, 165, 60, .6); transform: translateY(-4px); }
.team::before { /* 每張卡都有一道自己的光柱 */
  content: ""; position: absolute; top: 0; bottom: 38%; left: 50%; width: 22%; transform: translateX(-50%);
  background: var(--beam); opacity: .22; filter: blur(14px); transition: opacity .4s;
}
.team:hover::before { opacity: .55; }
.team__no { position: absolute; top: 12px; left: 16px; font-family: var(--display); font-weight: 200; font-size: clamp(40px, 4.6vw, 60px); line-height: 1; color: transparent; -webkit-text-stroke: 1px rgba(255, 255, 255, .5); }
.team__seg { position: relative; font-family: var(--display); font-size: 10px; font-weight: 600; letter-spacing: .24em; color: var(--orange); }
.team__name { position: relative; font-size: 18px; font-weight: 500; letter-spacing: .05em; line-height: 1.4; margin-top: 4px; }
.team__en { position: relative; font-family: var(--display); font-size: 12px; letter-spacing: .08em; color: var(--ink-2); }
.team__tag { position: relative; margin-top: 8px; font-size: 13px; color: var(--ink-2); line-height: 1.6; }
.team--tba .team__name { color: var(--ink-2); font-weight: 400; }
.team img.team__logo { position: relative; width: 100%; height: clamp(64px, 6.4vw, 86px); object-fit: contain; margin-bottom: 12px; padding: 6px 8px; background: #fff; border-radius: 2px; }
.team img.team__logo--dark { background: #1b1c22; box-shadow: inset 0 0 0 1px var(--line-2); padding: 14px 16px; }
.team__hit { position: absolute; inset: 0; z-index: 2; }
.team__hit:focus-visible { outline: 2px solid var(--amber); outline-offset: -2px; }
.team--link:has(.team__hit:focus-visible) { border-color: rgba(255, 165, 60, .6); }
.team__url { position: relative; margin-top: 8px; font-size: 12px; letter-spacing: .12em; color: var(--amber); transition: transform .3s; }
.team--link:hover .team__url { transform: translateX(3px); }

/* ── Agenda ── */
.agenda__date { margin-top: 28px; font-family: var(--display); font-weight: 200; font-size: clamp(56px, 7vw, 96px); line-height: 1; letter-spacing: .02em; }
.agenda__date small { font-size: .22em; font-weight: 500; letter-spacing: .3em; color: var(--orange); }
.timeline { position: relative; }
.timeline::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--beam); box-shadow: 0 0 18px rgba(255, 107, 26, .35); }
.timeline li { display: grid; gap: 2px 28px; padding: 22px 0 22px clamp(24px, 3vw, 40px); border-bottom: 1px solid var(--line); position: relative; }
.timeline li::before { content: ""; position: absolute; left: -3px; top: 34px; width: 9px; height: 9px; border-radius: 50%; background: var(--bg-tint); border: 1px solid var(--ink-3); }
.timeline li.is-key::before { background: var(--amber); border-color: var(--amber); box-shadow: 0 0 14px var(--orange); }
.timeline time { font-family: var(--display); font-size: 15px; font-weight: 400; letter-spacing: .08em; color: var(--ink-2); font-variant-numeric: tabular-nums; white-space: nowrap; padding-top: 3px; }
.timeline h3 { font-size: 19px; letter-spacing: .05em; line-height: 1.5; display: inline; }
.timeline p { color: var(--ink-3); font-size: 14.5px; }
.timeline .is-key h3 { color: #fff; }
.timeline .is-key time { color: var(--amber); }
.tag { display: inline-block; margin-right: 10px; padding: 3px 8px; font-family: var(--display); font-size: 10px; font-weight: 600; letter-spacing: .2em; color: #140700; background: linear-gradient(90deg, var(--orange), var(--amber)); border-radius: 2px; vertical-align: 3px; }
@media (min-width: 600px) { .timeline li { grid-template-columns: 128px 1fr; } }

/* ── Audience ── */
.room { border-top: 1px solid var(--line-2); }
.room > div { display: grid; gap: 6px 40px; padding: 26px 0; border-bottom: 1px solid var(--line); transition: padding .4s cubic-bezier(.2, .7, .2, 1), background .4s; }
.room > div:hover { padding-left: 18px; background: linear-gradient(90deg, rgba(255, 107, 26, .1), transparent 50%); }
.room dt { font-size: clamp(20px, 2vw, 25px); font-weight: 500; letter-spacing: .08em; }
.room dd { color: var(--ink-2); font-size: 16px; line-height: 1.9; }
@media (min-width: 820px) { .room > div { grid-template-columns: 240px 1fr; align-items: baseline; } }

/* ── Ways to join ── */
.ways { display: grid; gap: 16px; }
@media (min-width: 900px) { .ways { grid-template-columns: repeat(3, 1fr); } }
.ways > li { padding: clamp(26px, 3vw, 40px); background: var(--panel); border: 1px solid var(--line); border-top: 2px solid transparent; border-image: var(--beam-x) 1 1 0 0; border-image-width: 2px 0 0 0; }
.ways__who { font-size: 13px; font-weight: 500; letter-spacing: .24em; color: var(--orange); }
.ways h3 { margin: 10px 0 20px; font-size: clamp(21px, 2vw, 25px); letter-spacing: .05em; line-height: 1.45; }
.ways ul li { position: relative; padding-left: 20px; color: var(--ink-2); font-size: 15px; line-height: 1.8; }
.ways ul li + li { margin-top: 10px; }
.ways ul li::before { content: ""; position: absolute; left: 0; top: .8em; width: 9px; height: 1px; background: var(--amber); }

/* ── Hosts ── */
.hosts { display: grid; gap: clamp(28px, 4vw, 56px); }
@media (min-width: 900px) { .hosts { grid-template-columns: repeat(3, 1fr); } }
.hosts__logo { height: 84px; display: flex; align-items: center; padding: 14px 18px; background: #fff; border-radius: 2px; margin-bottom: 22px; width: fit-content; max-width: 100%; }
.hosts__logo img { max-height: 36px; width: auto; }
.hosts__logo--square { padding: 8px 14px; }
.hosts__logo--square img { max-height: 68px; }
.hosts__role { font-size: 13px; font-weight: 500; letter-spacing: .24em; color: var(--orange); }
.hosts h3 { margin: 6px 0 12px; font-size: 21px; letter-spacing: .05em; line-height: 1.5; }
.hosts li > p:last-child { color: var(--ink-2); font-size: 15px; }
.gcp {
  margin-top: clamp(48px, 6vw, 88px); display: grid; gap: 24px clamp(32px, 5vw, 72px);
  padding: clamp(28px, 3.4vw, 48px); border: 1px solid var(--line);
  background: radial-gradient(90% 120% at 0% 0%, rgba(66, 133, 244, .14), transparent 60%), var(--panel);
}
@media (min-width: 900px) { .gcp { grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); } }
.gcp__logo { margin-top: 18px; height: clamp(28px, 3.4vw, 42px); width: auto; max-width: 100%; }
.gcp h3 { font-size: clamp(20px, 2vw, 24px); letter-spacing: .05em; line-height: 1.45; }
.gcp__body > p { margin-top: 10px; color: var(--ink-2); font-size: 15.5px; }
.gcp__stack { margin-top: 24px; display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.gcp__stack li { display: grid; gap: 2px 24px; padding: 16px 20px; background: var(--bg); }
.gcp__stack b { font-family: var(--display); font-weight: 500; font-size: 15px; letter-spacing: .04em; color: var(--ink); }
.gcp__stack span { color: var(--ink-2); font-size: 14.5px; }
@media (min-width: 640px) { .gcp__stack li { grid-template-columns: 190px 1fr; align-items: baseline; } }
.field { margin-top: clamp(48px, 6vw, 88px); display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
@media (min-width: 900px) { .field { grid-template-columns: repeat(4, 1fr); } }
.field li { background: var(--bg); padding: 26px clamp(18px, 2.4vw, 32px); }
.field b { display: block; font-family: var(--display); font-weight: 200; font-size: clamp(34px, 4vw, 54px); line-height: 1.1; color: var(--amber); }
.field span { font-size: 14px; color: var(--ink-2); letter-spacing: .06em; }
.gov { margin-top: 32px; font-size: 13px; color: var(--ink-3); letter-spacing: .08em; }

/* ── Register ── */
.register { position: relative; isolation: isolate; overflow: hidden; padding-block: clamp(110px, 15vw, 210px) clamp(120px, 17vw, 240px); border-top: 1px solid var(--line); text-align: center; }
.register__art { /* 主視覺的光柱與地面，置中收尾 */
  position: absolute; z-index: -2; left: 50%; top: 0; bottom: 0; transform: translateX(-50%);
  aspect-ratio: 702 / 941; min-width: 520px;
}
.register__art img {
  width: 100%; height: 100%; object-fit: cover; mix-blend-mode: screen; margin-left: 8.3%; /* 光柱在原圖偏左，補回正中 */
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent), linear-gradient(180deg, transparent, #000 12%);
  -webkit-mask-composite: source-in; mask-image: linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent), linear-gradient(180deg, transparent, #000 12%); mask-composite: intersect;
}
.register::after { content: ""; position: absolute; z-index: -1; inset: 0; background: radial-gradient(70% 42% at 50% 40%, rgba(3, 3, 4, .8), rgba(3, 3, 4, .35) 70%, transparent); }
.register h2 { text-shadow: 0 2px 30px rgba(0, 0, 0, .8); }
.register .eyebrow span::before { display: none; }
.register h2 { margin-top: 20px; font-family: var(--serif); font-weight: 600; font-size: clamp(40px, 7vw, 96px); line-height: 1.3; letter-spacing: .06em; }
.register__info { margin: clamp(36px, 5vw, 60px) auto 0; max-width: 760px; text-align: left; border-left: 3px solid var(--orange); background: rgba(14, 15, 19, .82); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
.register__info > div { display: grid; grid-template-columns: 84px 1fr; padding: 14px 22px; }
.register__info > div + div { border-top: 1px solid var(--line); }
.register__info dt { color: var(--orange); font-weight: 500; letter-spacing: .5em; font-size: 14px; padding-top: 2px; }
.register__info dd { font-size: 15.5px; font-weight: 400; }
.register__cta { margin-top: 40px; display: flex; flex-wrap: wrap; gap: 20px 32px; align-items: center; justify-content: center; }
.register .note { color: var(--ink-2); }
.register .link { color: var(--ink); text-shadow: 0 1px 10px rgba(0, 0, 0, .7); }

/* ── Footer ── */
.footer { border-top: 1px solid var(--line); padding-block: 56px 0; font-size: 14px; color: var(--ink-2); background: #000; position: relative; z-index: 1; }
.footer__grid { display: grid; gap: 32px; }
@media (min-width: 860px) { .footer__grid { grid-template-columns: 1fr auto; } }
.footer__brand { font-family: var(--display); font-weight: 600; font-size: 16px; color: var(--ink); letter-spacing: .04em; }
.footer__brand span { font-family: var(--sans); font-weight: 500; }
.footer__partner { display: flex; align-items: center; gap: 12px; margin: 14px 0 6px; }
.footer__partner span { font-size: 12px; letter-spacing: .3em; color: var(--orange); font-weight: 500; }
.footer__partner img { height: 18px; width: auto; }
.footer__label { font-size: 12px; letter-spacing: .3em; color: var(--orange); font-weight: 500; margin-bottom: 4px; }
.footer a { text-decoration: none; border-bottom: 1px solid var(--line-2); }
.footer a:hover { color: var(--amber); border-color: var(--amber); }
.footer__tag { margin-top: 48px; text-align: center; font-family: var(--display); font-weight: 100; font-size: 9.6vw; line-height: .8; letter-spacing: .02em; white-space: nowrap; color: transparent; -webkit-text-stroke: 1px rgba(255, 255, 255, .16); overflow: hidden; user-select: none; }

/* ── Floating CTA（手機）── */
.fab { position: fixed; right: 16px; bottom: 16px; z-index: 95; box-shadow: 0 8px 30px rgba(0, 0, 0, .6), 0 0 24px rgba(255, 107, 26, .4); opacity: 0; pointer-events: none; transform: translateY(12px); transition: opacity .3s, transform .3s; }
.fab.is-on { opacity: 1; pointer-events: auto; transform: none; }
@media (min-width: 521px) { .fab { display: none; } }

/* ── Motion ── */
@keyframes fade-up { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
.js .reveal { opacity: 0; transform: translateY(22px); transition: opacity .8s cubic-bezier(.2, .7, .2, 1), transform .8s cubic-bezier(.2, .7, .2, 1); transition-delay: var(--d, 0ms); }
.js .reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}