/* 配色與元件取自 docs PDF 的 5 張設計圖：深海軍藍底、螢光綠強調、藍色等寬標籤、四角框線。 */
:root {
  --bg: #0b1424;
  --bg-alt: #0e1a2e;
  --panel: #111f36;
  --line: #24406a;
  --line-soft: #1a2e4d;
  --text: #eef3fb;
  --muted: #9fb1cc;
  --green: #8cf03c;
  --green-dim: #5fb52a;
  --blue: #5fb0f0;
  --warn: #ff5a36;
  --radius: 4px;
  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
/* 有設 display 的元素（例如 .reg-form 是 grid）會蓋掉瀏覽器預設的 [hidden]，這裡統一壓回去 */
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--green); }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--green); outline-offset: 2px; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link { position: absolute; left: -9999px; top: 8px; z-index: 100; background: var(--green); color: #000; padding: 8px 12px; }
.skip-link:focus { left: 8px; }

.wrap { width: min(1200px, 100% - 32px); margin-inline: auto; }
.wrap-narrow { width: min(820px, 100% - 32px); }

/* ── 頁首 ───────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 20, 36, .9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-soft);
}
.header-inner { display: flex; align-items: center; gap: 24px; min-height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 900; letter-spacing: .02em; }
.brand-tag { font-family: var(--mono); font-size: 12px; color: var(--green); border: 1px solid var(--green-dim); padding: 1px 6px; }
.brand-name { font-size: 15px; }
.brand-name b { color: var(--green); }
.site-nav { display: flex; gap: 22px; margin-left: auto; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
.site-nav a:hover { color: var(--text); }

/* ── 按鈕 ───────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 28px;
  border: 0; border-radius: var(--radius);
  font: inherit; font-weight: 800; letter-spacing: .04em;
  text-decoration: none; cursor: pointer;
  transition: transform .15s, box-shadow .15s, background .15s;
}
.btn-primary { background: var(--green); color: #07120a; box-shadow: 0 0 24px rgba(140, 240, 60, .25); }
.btn-primary:hover { background: #a4ff5c; box-shadow: 0 0 32px rgba(140, 240, 60, .45); transform: translateY(-1px); }
.btn-primary:disabled { background: #4a6b33; color: #142010; box-shadow: none; cursor: progress; transform: none; }
.btn-sm { min-height: 38px; padding: 0 16px; font-size: 14px; }
.btn-block { width: 100%; }

/* ── 主視覺 ─────────────────────────────────── */
.hero { background: #0a1322; }
.hero-img { width: 100%; max-width: 1600px; margin-inline: auto; }
.hero-bar { display: flex; justify-content: center; padding-block: 20px 28px; }
.accent { color: var(--green); text-shadow: 0 0 18px rgba(140, 240, 60, .4); }

/* ── 區塊 ───────────────────────────────────── */
.section { padding-block: 88px; }
.section-alt { background: var(--bg-alt); }
.eyebrow {
  display: inline-block; margin: 0 0 18px;
  font-family: var(--mono); font-size: 13px; font-weight: 700; letter-spacing: .14em;
  color: var(--green); border: 1px solid var(--green-dim); background: rgba(140, 240, 60, .06);
  padding: 4px 12px;
}
.eyebrow span { color: var(--green-dim); margin: 0 6px; }
.section-title { margin: 0 0 20px; font-size: clamp(28px, 4.2vw, 44px); line-height: 1.3; font-weight: 900; }
.section-title em, .sub-title em { font-style: normal; color: var(--green); }
.sub-title { margin: 56px 0 20px; font-size: clamp(22px, 2.8vw, 30px); font-weight: 900; line-height: 1.35; }
.lead { max-width: 860px; color: var(--muted); font-size: 18px; margin: 0 0 40px; }
.lead strong { color: var(--text); }
.note { color: var(--muted); font-size: 14px; }
.hl { color: var(--green); font-weight: 700; border-bottom: 2px solid var(--green); }

/* 四角框線：設計圖上每張卡片的角標 */
.frame {
  position: relative;
  background: linear-gradient(180deg, rgba(17, 31, 54, .9), rgba(13, 24, 42, .9));
  border: 1px solid var(--line-soft);
  padding: 24px;
  --c: var(--blue);
}
.frame::before, .frame::after {
  content: ""; position: absolute; width: 12px; height: 12px; pointer-events: none;
  border-color: var(--c); border-style: solid;
}
.frame::before { top: -1px; left: -1px; border-width: 2px 0 0 2px; }
.frame::after { bottom: -1px; right: -1px; border-width: 0 2px 2px 0; }
.frame-green { --c: var(--green); border-color: rgba(140, 240, 60, .35); }

.label { margin: 0 0 8px; font-family: var(--mono); font-size: 13px; letter-spacing: .12em; color: var(--blue); display: flex; justify-content: space-between; gap: 12px; }
.idx { color: var(--line); }

/* 事實卡 */
.fact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.fact-big { margin: 0; font-size: 30px; font-weight: 900; line-height: 1.2; }
.fact-big b { font-size: 96px; color: var(--green); text-shadow: 0 0 24px rgba(140, 240, 60, .45); margin-right: 10px; vertical-align: -10px; }
.fact-mid { margin: 4px 0; font-size: clamp(22px, 2.6vw, 30px); font-weight: 900; line-height: 1.35; }
.fact-em { margin: 6px 0 0; color: var(--green); font-weight: 800; font-size: 20px; }
.fact-date { margin: 8px 0 0; font-size: 72px; font-weight: 900; line-height: 1; color: var(--green); text-shadow: 0 0 24px rgba(140, 240, 60, .45); }
.hw-list { margin: 8px 0 0; display: grid; gap: 10px; }
.hw-list > div { display: grid; grid-template-columns: 110px 1fr; align-items: center; border: 1px solid var(--line-soft); background: rgba(8, 15, 28, .6); padding: 10px 16px; }
.hw-list dt { font-family: var(--mono); color: var(--blue); letter-spacing: .12em; font-size: 13px; }
.hw-list dd { margin: 0; font-weight: 800; font-size: 19px; line-height: 1.35; }
.hw-list small { display: block; color: var(--muted); font-weight: 600; font-size: 14px; }

.benefits { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.benefits h4 { margin: 0 0 8px; font-size: 19px; line-height: 1.45; }
.benefits p { margin: 0; color: var(--muted); }

/* 關卡 */
.levels-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.levels-flow { font-family: var(--mono); color: var(--muted); font-size: 13px; letter-spacing: .06em; margin: 0; }
.levels { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.level { display: flex; align-items: center; gap: 24px; }
.lv { font-weight: 900; color: var(--green); font-size: 28px; line-height: 1; min-width: 84px; border-right: 1px solid var(--line-soft); padding-right: 20px; }
.lv b { font-size: 72px; text-shadow: 0 0 20px rgba(140, 240, 60, .4); }
.level-task { margin: 0; font-size: 24px; font-weight: 900; line-height: 1.4; }
.level-task em { font-style: normal; color: var(--green); border-bottom: 3px solid var(--green); }
.level-max { --c: var(--warn); border-color: rgba(255, 90, 54, .4); }
.badge { background: var(--warn); color: #fff; font-size: 11px; padding: 1px 8px; letter-spacing: .1em; }
.rule-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 20px; }
.rule { margin: 0; font-size: 20px; font-weight: 800; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.rule em { font-style: normal; color: var(--green); }
.rule-warn { --c: var(--warn); border-color: rgba(255, 90, 54, .4); }
.rule-warn strong { color: var(--warn); }
.tag { font-family: var(--mono); font-size: 13px; letter-spacing: .12em; border: 1px solid var(--blue); color: var(--blue); padding: 2px 10px; }
.tag-warn { background: var(--warn); border-color: var(--warn); color: #fff; }
.tag-blue { margin-right: 12px; }

.spec-list { margin: 0; padding-left: 1.2em; display: grid; gap: 10px; font-size: 17px; }
.spec-list li::marker { color: var(--green); }

/* NVIDIA 與獎項 */
.support-grid { display: grid; grid-template-columns: 5fr 7fr; gap: 40px; align-items: center; }
.nv-word { margin: 16px 0; font-size: clamp(64px, 10vw, 128px); font-weight: 900; line-height: 1; letter-spacing: -.01em; text-shadow: 0 0 30px rgba(238, 243, 251, .15); }
.partner { margin: 0; font-size: clamp(22px, 2.6vw, 32px); font-weight: 900; display: flex; align-items: center; flex-wrap: wrap; }
.support-cards { display: grid; gap: 20px; }
.credit-title { margin: 0; font-size: 30px; font-weight: 900; }
.credit-title em { font-style: normal; color: var(--green); }
.credit-amount { margin: 0; font-size: clamp(56px, 9vw, 112px); font-weight: 900; line-height: 1.05; color: var(--green); text-shadow: 0 0 30px rgba(140, 240, 60, .45); letter-spacing: -.02em; }
.credit p:last-child { margin: 8px 0 0; font-size: 20px; font-weight: 700; }

.prize { margin-top: 56px; display: grid; grid-template-columns: 220px 1fr 1.2fr; gap: 32px; align-items: center; }
.prize-rank { margin: 8px 0 0; font-size: 72px; font-weight: 900; line-height: 1; text-shadow: 0 0 24px rgba(140, 240, 60, .4); }
.prize-rank small { display: block; font-family: var(--mono); font-size: 16px; color: var(--green); letter-spacing: .2em; margin-bottom: 8px; }
.prize img { border: 1px solid var(--line-soft); }
.prize-name { margin: 0; font-size: 28px; font-weight: 900; line-height: 1.3; }
.prize-value { margin: 6px 0 12px; font-size: 22px; font-weight: 800; }
.prize-value b { color: var(--green); font-size: 44px; }
.prize-body p:last-child { color: var(--muted); margin: 0; }

.first-round { margin-top: 32px; }

/* 時程 */
.timeline { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline::before { content: ""; position: absolute; left: 140px; top: 8px; bottom: 8px; width: 1px; background: var(--line); }
.timeline li { display: grid; grid-template-columns: 140px 1fr; gap: 32px; padding: 0 0 28px; position: relative; }
.timeline li::before { content: ""; position: absolute; left: 136px; top: 10px; width: 9px; height: 9px; background: var(--bg); border: 2px solid var(--blue); border-radius: 50%; }
.timeline time { font-family: var(--mono); font-weight: 700; color: var(--blue); font-size: 17px; padding-top: 2px; }
.timeline h3 { margin: 0; font-size: 20px; padding-left: 8px; }
.timeline p { margin: 4px 0 0; color: var(--muted); padding-left: 8px; overflow-wrap: anywhere; }
.tl-final time { color: var(--green); }
.tl-final::before { border-color: var(--green) !important; background: var(--green) !important; box-shadow: 0 0 12px var(--green); }
.tl-final h3 { color: var(--green); }

/* ── 表單 ───────────────────────────────────── */
.reg-form { display: grid; gap: 24px; }
fieldset.frame { margin: 0; min-width: 0; }
legend { padding: 0 8px; font-weight: 900; font-size: 19px; }
.field { margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }
.field label { display: block; font-weight: 700; margin-bottom: 6px; font-size: 15px; }
.req { color: var(--warn); margin-left: 3px; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.row-2 > .field { margin-bottom: 16px; }
.row-phone { grid-template-columns: minmax(0, 2fr) minmax(0, 3fr); }
input[type=text], input[type=email], input[type=tel], select {
  width: 100%; min-height: 46px; padding: 10px 12px;
  background: #0a1426; color: var(--text);
  border: 1px solid var(--line); border-radius: var(--radius);
  font: inherit; font-size: 16px;
}
input:focus, select:focus { outline: none; border-color: var(--green); box-shadow: 0 0 0 3px rgba(140, 240, 60, .2); }
[aria-invalid=true] { border-color: var(--warn) !important; }
.error { margin: 6px 0 0; color: #ff8a6e; font-size: 14px; }
.hint { margin: 6px 0 0; color: var(--muted); font-size: 13px; }
.members { display: grid; gap: 0; }
.member { border-top: 1px dashed var(--line-soft); padding-top: 14px; }
.field-check label { display: flex; gap: 10px; align-items: flex-start; font-weight: 600; }
.field-check input { width: 20px; height: 20px; margin-top: 3px; accent-color: var(--green); flex: none; }
.notes { margin-top: 20px; border-top: 1px solid var(--line-soft); padding-top: 16px; font-size: 14px; color: var(--muted); }
.notes ol { margin: 0; padding-left: 1.4em; display: grid; gap: 6px; }
.form-status { margin: 0; padding: 14px 16px; border: 1px solid var(--warn); background: rgba(255, 90, 54, .1); color: #ffc2b3; }
.success:focus { outline: none; }
.success .serial { font-size: 18px; margin: 16px 0; }
.success .serial b { font-size: 40px; color: var(--green); margin-left: 8px; font-family: var(--mono); }
.next-step, .summary { border-top: 1px solid var(--line-soft); padding-top: 16px; }
.summary dl { margin: 0; display: grid; grid-template-columns: 9em 1fr; gap: 6px 16px; font-size: 15px; }
.summary dt { color: var(--muted); }
.summary dd { margin: 0; overflow-wrap: anywhere; }
@media (max-width: 760px) { .summary dl { grid-template-columns: 1fr; gap: 0; } .summary dd { margin-bottom: 8px; } }
.notice { text-align: center; }
/* 陷阱欄位：移出畫面而不是 display:none，機器人才會以為要填 */
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

/* ── 頁尾 ───────────────────────────────────── */
.site-footer { border-top: 1px solid var(--line-soft); padding-block: 40px; color: var(--muted); font-size: 14px; }
.footer-inner p { margin: 8px 0 0; }
.orgs { display: flex; gap: 40px; flex-wrap: wrap; margin: 0; }
.orgs dt { font-family: var(--mono); color: var(--blue); font-size: 12px; letter-spacing: .1em; }
.orgs dd { margin: 0; color: var(--text); font-weight: 700; font-size: 16px; }
.copy { opacity: .7; }

/* ── 響應式 ─────────────────────────────────── */
@media (max-width: 960px) {
  .support-grid { grid-template-columns: 1fr; gap: 24px; }
  .prize { grid-template-columns: 1fr; gap: 20px; }
}
@media (max-width: 760px) {
  .site-nav { display: none; }
  .header-inner { justify-content: space-between; }
  .brand-name { font-size: 13px; }
  .section { padding-block: 56px; }
  .fact-grid, .benefits, .levels, .rule-row, .row-2 { grid-template-columns: 1fr; }
  .row-phone { grid-template-columns: 1fr; }
  .hero-bar .btn { width: 100%; }
  .fact-big b { font-size: 72px; }
  .hw-list > div { grid-template-columns: 1fr; gap: 2px; }
  .lv b { font-size: 56px; }
  .level { gap: 16px; }
  .level-task { font-size: 20px; }
  .timeline::before { left: 4px; }
  .timeline li { grid-template-columns: 1fr; gap: 4px; padding-left: 24px; }
  .timeline li::before { left: 0; }
  .timeline h3, .timeline p { padding-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}