@font-face {
  font-family: "Orbitron";
  src: url("/assets/orbitron-bold.woff2") format("woff2");
  font-weight: 700; font-style: normal; font-display: swap;
}

:root {
  --field: #070A0F; --field-2: #0B0F16; --panel: #10161F;
  --line: #1D2530; --line-2: #2A3441;
  --text: #E8EDF2; --muted: #808B96; --steel: #9AA3AD;
  --accent: #22D3EE; --accent-deep: #0EA5C4;
  --disp: "Orbitron", "Noto Sans TC", sans-serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
          "Noto Sans TC", "Noto Sans CJK TC", "PingFang TC",
          "Microsoft JhengHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
html[lang="ja"] body {
  font-family: ui-sans-serif, system-ui, "Noto Sans JP", "Noto Sans CJK JP",
               "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--field); color: var(--text);
  font-family: var(--sans); font-size: 16px; line-height: 1.75;
  letter-spacing: .01em;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 28px; }
.wrap-n { max-width: 820px; margin: 0 auto; padding: 0 28px; }
::selection { background: rgba(34,211,238,.25); }

/* 斜體以合成 oblique 呈現（Orbitron 無原生 italic） */
.oblq { font-family: var(--disp); font-weight: 700; font-style: oblique 9deg; }

/* ---------------- nav ---------------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  background: rgba(7,10,15,.55); backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
.nav.scrolled { border-bottom-color: var(--line); background: rgba(7,10,15,.82); }
.nav .wrap { display: flex; align-items: center; min-height: 64px; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand:hover { text-decoration: none; }
.brand .mark { color: var(--accent); transition: color .3s; }
.brand:hover .mark { color: var(--text); }
.brand b {
  font-family: var(--disp); font-style: oblique 9deg; font-weight: 700;
  font-size: 17px; letter-spacing: .16em; color: var(--steel);
  transform: translateY(1px);
}
.nav nav { margin-left: auto; display: flex; gap: 22px; align-items: center; }
.nav nav a { color: var(--muted); font-size: 13.5px; letter-spacing: .06em; }
.nav nav a:hover { color: var(--text); text-decoration: none; }
.langs {
  display: flex; align-items: stretch; margin-left: 12px;
  border: 1px solid var(--line-2); background: rgba(16,22,31,.6);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}
.langs a {
  display: flex; align-items: center; padding: 6px 13px;
  font-family: var(--disp); font-style: oblique 9deg; font-weight: 700;
  font-size: 10.5px; letter-spacing: .1em; color: var(--muted);
  transition: color .2s, background .2s;
}
.langs a + a { border-left: 1px solid var(--line); }
.langs a:hover { color: var(--text); background: rgba(42,52,65,.55); text-decoration: none; }
.langs a.on { background: var(--accent); color: #05262E; }
.langs a.on:hover { background: #4ADDF4; color: #05262E; }
@media (max-width: 720px) {
  .nav nav { gap: 12px; }
  .nav nav a { font-size: 12px; letter-spacing: .02em; }
  .langs { margin-left: 2px; }
}

/* ---------------- hero ---------------- */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: center; overflow: hidden;
  background:
    radial-gradient(1100px 520px at 82% 18%, rgba(14,60,80,.38), transparent 60%),
    linear-gradient(160deg, #0A1018 0%, var(--field) 55%);
}
.hero canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.hero .watermark {
  position: absolute; right: -4%; top: 50%;
  transform: translateY(-50%); height: 130vh; max-height: 1150px;
  color: #10161F; z-index: 1; pointer-events: none;
}
.hero .wrap { position: relative; z-index: 2; padding-top: 96px; padding-bottom: 72px; }
.kicker {
  font-family: var(--disp); font-style: oblique 9deg; font-weight: 700;
  font-size: 12.5px; letter-spacing: .3em; color: var(--accent);
  margin: 0 0 26px; text-transform: uppercase; min-height: 1.6em;
}
.kicker::before {
  content: ""; display: inline-block; width: 34px; height: 2px;
  background: var(--accent); vertical-align: middle; margin-right: 14px;
}
.hero h1 {
  margin: 0 0 28px; font-size: clamp(38px, 6.8vw, 80px);
  line-height: 1.16; letter-spacing: .015em; font-weight: 700;
}
.hero h1 .en {
  display: block; font-family: var(--disp); font-style: oblique 9deg;
  color: var(--steel); font-size: clamp(13px, 1.6vw, 20px);
  letter-spacing: .28em; margin-top: 20px;
}
.hero .lede {
  color: var(--muted); font-size: clamp(16px, 1.6vw, 19px);
  max-width: 58ch; margin: 0 0 44px;
}
.cta-row { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 30px;
  font-family: var(--disp); font-weight: 700; font-style: oblique 9deg;
  font-size: 13.5px; letter-spacing: .12em;
  border: 1px solid var(--line-2); color: var(--text);
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
  background: var(--panel); transition: border-color .25s, color .25s, background .25s;
  cursor: pointer;
}
.btn:hover { text-decoration: none; border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #05262E; }
.btn.primary:hover { background: #4ADDF4; color: #05262E; }
.scroll-hint {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%);
  z-index: 2; color: var(--muted); font-size: 11px; letter-spacing: .3em;
  font-family: var(--disp); font-style: oblique 9deg;
  animation: hint 2.4s ease-in-out infinite;
}
@keyframes hint { 0%,100% { opacity: .35; } 50% { opacity: .9; } }
@media (prefers-reduced-motion: reduce) { .scroll-hint { animation: none; } }

/* ---------------- ticker ---------------- */
.ticker {
  border-block: 1px solid var(--line); background: var(--field-2);
  overflow: hidden; padding: 15px 0;
}
.ticker .track { display: flex; width: max-content; animation: tick 46s linear infinite; }
.ticker:hover .track { animation-play-state: paused; }
@keyframes tick { to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .ticker .track { animation: none; } }
.ticker span {
  font-family: var(--disp); font-style: oblique 9deg; font-weight: 700;
  font-size: 12px; letter-spacing: .24em; color: var(--muted);
  padding: 0 34px; white-space: nowrap;
}
.ticker span::after {
  content: "◆"; color: var(--accent-deep); font-size: 8px;
  margin-left: 66px; vertical-align: 2px;
}

/* ---------------- sections ---------------- */
section.sec { padding: 110px 0; border-bottom: 1px solid var(--line); }
.sec-head { margin-bottom: 56px; }
.sec-head .tag {
  font-family: var(--disp); font-style: oblique 9deg; font-weight: 700;
  font-size: 12px; letter-spacing: .3em; color: var(--accent);
  margin: 0 0 16px; text-transform: uppercase; min-height: 1.5em;
}
.sec-head h2 { margin: 0; font-size: clamp(28px, 4vw, 44px); line-height: 1.25; }
.sec-head p { color: var(--muted); margin: 16px 0 0; max-width: 60ch; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
@media (max-width: 900px) { .cards { grid-template-columns: 1fr; } }
.card {
  position: relative; background: var(--panel);
  border: 1px solid var(--line); padding: 34px 30px 30px;
  transition: transform .3s, border-color .3s, box-shadow .3s; overflow: hidden;
}
.card::before {
  content: ""; position: absolute; inset: 0 auto 0 0; width: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-deep));
  opacity: 0; transition: opacity .3s;
}
.card:hover {
  transform: translateY(-6px); border-color: var(--line-2);
  box-shadow: 0 18px 42px rgba(0,0,0,.45), 0 0 0 1px rgba(34,211,238,.06);
}
.card:hover::before { opacity: 1; }
.card .idx {
  font-family: var(--disp); font-style: oblique 9deg; font-weight: 700;
  font-size: 14px; letter-spacing: .2em; color: var(--accent);
  display: block; margin-bottom: 20px;
}
.card h3 { margin: 0 0 14px; font-size: 21px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .en {
  display: block; margin-top: 22px; font-family: var(--disp);
  font-style: oblique 9deg; font-weight: 700;
  font-size: 10.5px; letter-spacing: .22em; color: #55606B;
}

.docrows { display: grid; }
.docrow {
  display: grid; grid-template-columns: 88px 1fr auto; gap: 26px;
  align-items: baseline; padding: 30px 6px;
  border-top: 1px solid var(--line); color: inherit;
  transition: background .25s, padding-left .25s;
}
.docrow:last-child { border-bottom: 1px solid var(--line); }
.docrow:hover { text-decoration: none; background: var(--field-2); padding-left: 18px; }
.docrow .no {
  font-family: var(--disp); font-style: oblique 9deg; font-weight: 700;
  font-size: 24px; color: #3A4552; transition: color .25s;
}
.docrow:hover .no { color: var(--accent); }
.docrow h3 { margin: 0 0 6px; font-size: 20px; }
.docrow h3 small {
  display: block; font-family: var(--disp); font-style: oblique 9deg; font-weight: 700;
  font-size: 10.5px; letter-spacing: .24em; color: #55606B; margin-top: 6px;
}
.docrow p { margin: 0; color: var(--muted); font-size: 14.5px; max-width: 62ch; }
.docrow .arrow { font-size: 22px; color: var(--muted); transition: transform .25s, color .25s; }
.docrow:hover .arrow { transform: translateX(8px); color: var(--accent); }
@media (max-width: 700px) {
  .docrow { grid-template-columns: 1fr auto; }
  .docrow .no { display: none; }
}

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }
.ch-list { display: grid; gap: 14px; }
.ch {
  display: flex; align-items: center; gap: 18px;
  border: 1px solid var(--line); background: var(--panel); padding: 18px 22px;
}
.ch .lbl {
  font-family: var(--disp); font-style: oblique 9deg; font-weight: 700;
  font-size: 10.5px; letter-spacing: .2em; color: var(--muted); min-width: 88px;
}
.ch .val { font-family: var(--mono); font-size: 15px; color: var(--text); }
.pgp-box { border: 1px solid var(--line); background: var(--panel); padding: 26px 26px 22px; }
.pgp-box .lbl {
  font-family: var(--disp); font-style: oblique 9deg; font-weight: 700;
  font-size: 10.5px; letter-spacing: .2em; color: var(--muted);
  display: block; margin-bottom: 14px;
}
.pgp-box code {
  font-family: var(--mono); font-size: 14px; letter-spacing: .06em;
  color: var(--accent); word-break: break-all; display: block; line-height: 1.9;
}
.pgp-actions { margin-top: 18px; display: flex; gap: 12px; flex-wrap: wrap; }
.pgp-actions .btn { padding: 9px 20px; font-size: 12px; }
.copy-ok { color: var(--accent); font-size: 13px; align-self: center; opacity: 0;
           transition: opacity .3s; }
.copy-ok.show { opacity: 1; }

footer { padding: 54px 0 64px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
footer .mark { color: var(--accent); }
footer .right { margin-left: auto; display: flex; gap: 22px; }
footer a { color: var(--muted); }
footer a:hover { color: var(--accent); }

.rv { opacity: 0; transform: translateY(26px);
      transition: opacity .7s ease, transform .7s ease; }
.rv.in { opacity: 1; transform: none; }
.rv.d1 { transition-delay: .08s; } .rv.d2 { transition-delay: .16s; }
.rv.d3 { transition-delay: .24s; }
@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
}

/* ---------------- 文件內頁 ---------------- */
.prose-hero {
  padding: 150px 0 46px; border-bottom: 1px solid var(--line);
  background:
    radial-gradient(700px 300px at 85% 0%, rgba(14,60,80,.3), transparent 60%),
    var(--field-2);
}
.prose-hero .tag {
  font-family: var(--disp); font-style: oblique 9deg; font-weight: 700;
  font-size: 11.5px; letter-spacing: .28em; color: var(--accent);
  margin: 0 0 14px; min-height: 1.5em;
}
.prose-hero h1 { margin: 0; font-size: clamp(28px, 4.4vw, 44px); }
.prose { padding: 46px 0 96px; }
.prose h1 { font-size: 28px; margin: 40px 0 10px; }
.prose h2 {
  font-size: 21px; margin: 48px 0 14px; padding-top: 26px;
  border-top: 1px solid var(--line);
}
.prose h3 { font-size: 17px; margin: 30px 0 10px; color: var(--accent); }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose blockquote {
  margin: 22px 0; padding: 16px 22px; border-left: 3px solid var(--accent);
  background: var(--panel); color: var(--muted);
}
.prose blockquote p { color: inherit; margin: 0; }
.prose code {
  background: var(--panel); border: 1px solid var(--line);
  padding: 1px 7px; border-radius: 2px; font-size: .9em; font-family: var(--mono);
}
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
.table-scroll { overflow-x: auto; margin: 22px 0; }
.prose table { border-collapse: collapse; width: 100%; font-size: 15px; }
.prose th, .prose td {
  border: 1px solid var(--line); padding: 11px 15px;
  text-align: left; vertical-align: top;
}
.prose th { background: var(--panel); font-weight: 600; }
.back {
  display: inline-block; margin-bottom: 8px; font-size: 13px; color: var(--muted);
  font-family: var(--disp); font-style: oblique 9deg; letter-spacing: .1em;
}