:root {
  --bg: #0b1220;
  --bg2: #0e1628;
  --card: rgba(18, 26, 43, 0.78);
  --card-solid: #121a2b;
  --line: #243049;
  --line-soft: rgba(36, 48, 73, 0.7);
  --text: #e8eef8;
  --muted: #9aa8c0;
  --accent: #c9a46a;
  --accent-soft: rgba(201, 164, 106, 0.16);
  --accent2: #7eb6ff;
  --accent2-soft: rgba(126, 182, 255, 0.12);
  --ok: #1f6b3a;
  --ok-text: #7CFF9A;
  --danger-soft: rgba(255, 120, 120, 0.08);
  --radius: 16px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --header-h: 64px;
  --font: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", "Noto Sans", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(1200px 600px at 8% -12%, #1a2744 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #1d1830 0%, transparent 50%),
    radial-gradient(700px 400px at 50% 100%, #122033 0%, transparent 45%),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}
a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img { max-width: 100%; height: auto; }

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px 56px;
}

/* —— Sticky header —— */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  background: rgba(11, 18, 32, 0.78);
  border-bottom: 1px solid var(--line-soft);
}
.site-header .inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  font-weight: 750;
  letter-spacing: .14em;
  font-size: 13px;
  color: var(--accent);
  text-transform: uppercase;
  white-space:nowrap;
}
.brand:hover { text-decoration: none; opacity: .92; }

.nav-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* About dropdown */
.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-item { position: relative; }
.nav-btn, .nav-link {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 10px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.nav-btn:hover, .nav-link:hover,
.nav-btn[aria-expanded="true"] {
  background: rgba(255,255,255,0.05);
  text-decoration: none;
}
.nav-btn .chev {
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid var(--muted);
  transition: transform .18s ease;
}
.nav-btn[aria-expanded="true"] .chev { transform: rotate(180deg); }

.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 240px;
  padding: 8px;
  border-radius: 14px;
  background: rgba(14, 22, 40, 0.96);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  display: none;
  flex-direction: column;
  gap: 2px;
}
.nav-item.open .dropdown,
.nav-item:hover .dropdown,
.nav-item:focus-within .dropdown {
  display: flex;
}
.dropdown a {
  color: var(--text);
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  display: block;
  text-decoration: none;
}
.dropdown a:hover,
.dropdown a:focus {
  background: var(--accent-soft);
  color: var(--accent);
  outline: none;
}

/* Lang toggle */
.lang {
  display: inline-flex;
  border: 1px solid #3a4558;
  border-radius: 999px;
  overflow: hidden;
  background: #0a0f18;
  padding: 2px;
}
.lang button {
  appearance: none; border: 0; background: transparent;
  color: var(--muted); padding: 6px 12px; font-size: 12px;
  cursor: pointer; font-weight: 650; border-radius: 999px; line-height: 1.2;
}
.lang button[aria-pressed="true"] {
  background: var(--ok);
  color: var(--ok-text);
}

.nav-mobile { display: none; }

/* Mobile hamburger */
.menu-toggle {
  display: none;
  appearance: none; border: 1px solid var(--line); background: transparent;
  color: var(--text); width: 40px; height: 40px; border-radius: 10px;
  cursor: pointer; align-items: center; justify-content: center;
}
.menu-toggle span {
  display: block; width: 18px; height: 2px; background: var(--text);
  position: relative;
}
.menu-toggle span::before, .menu-toggle span::after {
  content: ""; position: absolute; left: 0; width: 18px; height: 2px; background: var(--text);
}
.menu-toggle span::before { top: -6px; }
.menu-toggle span::after { top: 6px; }

@media (max-width: 760px) {
  .menu-toggle { display: inline-flex; }
  .nav-desktop { display: none; }
  .nav-mobile {
    display: none;
    position: absolute;
    left: 0; right: 0; top: var(--header-h);
    background: rgba(11, 18, 32, 0.97);
    border-bottom: 1px solid var(--line);
    padding: 12px 20px 18px;
    flex-direction: column;
    gap: 4px;
  }
  body.nav-open .nav-mobile { display: flex; }
  .nav-mobile a {
    color: var(--text);
    padding: 12px 10px;
    border-radius: 10px;
    font-weight: 600;
    text-decoration: none;
  }
  .nav-mobile a:hover { background: rgba(255,255,255,0.05); }
  .nav-mobile .sub { padding-left: 18px; font-weight: 500; color: var(--muted); font-size: 14px; }
}

/* —— Page chrome —— */
.page-hero {
  padding: 44px 0 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
}
.page-hero .eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  letter-spacing: .12em;
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 700;
}
.page-hero h1 {
  margin: 0 0 12px;
  font-size: clamp(28px, 5vw, 44px);
  letter-spacing: .02em;
  font-weight: 750;
  line-height: 1.18;
}
.page-hero .lead {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  max-width: 46rem;
}

.grid-2 {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}
@media (min-width: 760px) {
  .grid-2 { grid-template-columns: 1.15fr .85fr; }
}
.grid-3 {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}
@media (min-width: 760px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}
.grid-cards {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .grid-cards { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .grid-cards.cols-3 { grid-template-columns: repeat(3, 1fr); }
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 22px 20px;
  box-shadow: 0 1px 0 rgba(255,255,255,0.03) inset;
  backdrop-filter: blur(8px);
}
.card.glass {
  background: linear-gradient(180deg, rgba(24,34,54,0.85), rgba(14,22,40,0.72));
}
.card h2, .card h3 {
  margin: 0 0 10px;
  font-size: 14px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}
.card h3.plain {
  text-transform: none;
  letter-spacing: 0;
  font-size: 17px;
  color: var(--text);
}
.card p { margin: 0 0 10px; }
.card p:last-child { margin-bottom: 0; }
.muted { color: var(--muted); font-size: 14px; }
.small { font-size: 13px; }

/* Exclusive localization: only active language visible (!important beats cache/specificity) */
.bilingual {
  display: grid;
  gap: 0;
}
.bilingual .zh, .bilingual .en {
  margin: 0;
}
.bilingual .zh { display: none !important; }
.bilingual .en { display: block !important; color: var(--text); }
html[lang="en"] .bilingual .zh,
html[data-lang="en"] .bilingual .zh { display: none !important; }
html[lang="en"] .bilingual .en,
html[data-lang="en"] .bilingual .en { display: block !important; color: var(--text); }
html[lang="zh"] .bilingual .zh,
html[data-lang="zh"] .bilingual .zh { display: block !important; color: var(--text); }
html[lang="zh"] .bilingual .en,
html[data-lang="zh"] .bilingual .en { display: none !important; }

.bi-block { display: grid; gap: 0; margin-bottom: 12px; }
.bi-block .line-zh { display: none !important; color: var(--text); }
.bi-block .line-en { display: block !important; color: var(--text); }
html[lang="en"] .bi-block .line-zh,
html[data-lang="en"] .bi-block .line-zh { display: none !important; }
html[lang="en"] .bi-block .line-en,
html[data-lang="en"] .bi-block .line-en { display: block !important; color: var(--text); }
html[lang="zh"] .bi-block .line-zh,
html[data-lang="zh"] .bi-block .line-zh { display: block !important; color: var(--text); }
html[lang="zh"] .bi-block .line-en,
html[data-lang="zh"] .bi-block .line-en { display: none !important; }

.note, .disclaimer {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px dashed var(--line);
  color: var(--muted);
  font-size: 13px;
  background: rgba(0,0,0,0.18);
}
.disclaimer.strong {
  border-style: solid;
  border-color: rgba(201, 164, 106, 0.35);
  background: var(--accent-soft);
  color: var(--text);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.pill.live { background: rgba(124,255,154,0.12); color: var(--ok-text); }
.pill.progress { background: var(--accent2-soft); color: var(--accent2); }
.pill.planned { background: rgba(154,168,192,0.12); color: var(--muted); }

/* Timeline / roadmap */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.timeline li {
  position: relative;
  padding: 18px 18px 16px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--card);
}
.timeline li::before {
  content: "";
  position: absolute;
  left: 0; top: 14px; bottom: 14px;
  width: 3px;
  border-radius: 3px;
  background: var(--accent);
}
.timeline li.in-progress::before { background: var(--accent2); }
.timeline li.planned::before { background: var(--muted); }
.timeline .head {
  display: flex; flex-wrap: wrap; gap: 8px 12px;
  align-items: center; justify-content: space-between;
  margin-bottom: 8px;
}
.timeline h3 {
  margin: 0;
  font-size: 16px;
  color: var(--text);
  letter-spacing: 0;
  text-transform: none;
}

/* Definition lists / facts */
.facts {
  display: grid;
  gap: 0;
  margin: 0;
}
.facts > div {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}
@media (min-width: 640px) {
  .facts > div { grid-template-columns: 200px 1fr; gap: 16px; align-items: start; }
}
.facts dt {
  margin: 0;
  color: var(--accent);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  font-weight: 700;
}
.facts dd { margin: 0; color: var(--text); }
.facts code, code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: rgba(0,0,0,0.28);
  padding: 2px 6px;
  border-radius: 6px;
}

.table-wrap { overflow-x: auto; margin: 8px 0; }
table.clean {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
table.clean th, table.clean td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.clean th {
  color: var(--accent);
  font-size: 12px;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.person {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.person .name {
  font-size: 20px;
  font-weight: 700;
  margin: 0;
  color: var(--text);
}
.person .role { color: var(--muted); margin: 0; }
.person ul { margin: 8px 0 0; padding-left: 18px; color: var(--text); }
.person li { margin-bottom: 4px; }

.cta-row {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 12px;
  font-weight: 650;
  font-size: 14px;
  border: 1px solid transparent;
  text-decoration: none !important;
  cursor: pointer;
}
.btn-primary {
  background: linear-gradient(180deg, #d4b57a, var(--accent));
  color: #1a1408 !important;
}
.btn-primary:hover { filter: brightness(1.05); }
.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text) !important;
}
.btn-ghost:hover { border-color: var(--accent2); color: var(--accent2) !important; }

.link-cards a.card-link {
  display: block;
  color: inherit;
  text-decoration: none;
  transition: border-color .15s ease, transform .15s ease;
}
.link-cards a.card-link:hover {
  border-color: rgba(201,164,106,0.55);
  transform: translateY(-1px);
}
.link-cards .card-link h3 {
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
  font-size: 16px;
  margin-bottom: 6px;
}
.link-cards .card-link .arrow { color: var(--accent); font-weight: 700; }

.section { margin: 28px 0; }
.section > h2 {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
}

.site-footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  justify-content: space-between;
}
.site-footer .fine { max-width: 52rem; }

.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; word-break: break-all; }

/* Exclusive [lang-zh] / [lang-en] — only active language visible */
[lang-zh] { display: none !important; }
[lang-en] { display: inline !important; }
html[lang="en"] [lang-zh] { display: none !important; }
html[lang="en"] [lang-en] { display: inline !important; }
html[lang="zh"] [lang-en] { display: none !important; }
html[lang="zh"] [lang-zh] { display: inline !important; }

/* Block-level lang wrappers */
html[lang="en"] h1[lang-en],
html[lang="en"] h2[lang-en],
html[lang="en"] h3[lang-en],
html[lang="en"] p[lang-en],
html[lang="en"] li[lang-en],
html[lang="en"] div[lang-en],
html[lang="en"] dt[lang-en],
html[lang="en"] dd[lang-en],
html[lang="en"] a[lang-en] { display: block; }
html[lang="zh"] h1[lang-zh],
html[lang="zh"] h2[lang-zh],
html[lang="zh"] h3[lang-zh],
html[lang="zh"] p[lang-zh],
html[lang="zh"] li[lang-zh],
html[lang="zh"] div[lang-zh],
html[lang="zh"] dt[lang-zh],
html[lang="zh"] dd[lang-zh],
html[lang="zh"] a[lang-zh] { display: block; }

/* Inline exceptions for block-looking tags used as spans inside parents */
html[lang="en"] span[lang-en],
html[lang="zh"] span[lang-zh] { display: inline !important; }
html[lang="en"] a span[lang-en],
html[lang="zh"] a span[lang-zh],
html[lang="en"] button span[lang-en],
html[lang="zh"] button span[lang-zh],
html[lang="en"] h1 span[lang-en],
html[lang="zh"] h1 span[lang-zh],
html[lang="en"] h2 span[lang-en],
html[lang="zh"] h2 span[lang-zh],
html[lang="en"] h3 span[lang-en],
html[lang="zh"] h3 span[lang-zh],
html[lang="en"] dt span[lang-en],
html[lang="zh"] dt span[lang-zh],
html[lang="en"] dd span[lang-en],
html[lang="zh"] dd span[lang-zh],
html[lang="en"] li span[lang-en],
html[lang="zh"] li span[lang-zh],
html[lang="en"] p span[lang-en],
html[lang="zh"] p span[lang-zh] { display: inline !important; }

/* JS sets hidden= on inactive lang nodes — must win over display:inline !important */
[hidden] { display: none !important; }