:root {
  --ink: #f4f6ff;
  --soft: rgba(244, 246, 255, 0.74);
  --faint: rgba(244, 246, 255, 0.5);
  --amber: #ff9e1a;
  --amber-ink: #1f1200;
  --card: rgba(255, 255, 255, 0.07);
  --line: rgba(255, 255, 255, 0.12);
  --deep: #070a33;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  color: var(--ink);
  background: radial-gradient(ellipse 120% 70% at 50% 0%, #24339a 0%, #0b1050 45%, var(--deep) 100%) fixed, var(--deep);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "Noto Sans", "Noto Sans TC", "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", "Noto Sans Arabic", "Noto Sans Devanagari", sans-serif;
  overflow-wrap: anywhere;
}
a { color: var(--amber); }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; border-radius: 6px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 12px; background: var(--amber); color: var(--amber-ink); padding: 8px 12px; border-radius: 8px; z-index: 10; }

header, main, footer { max-width: 1040px; margin: 0 auto; padding-inline: 20px; }
header { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-block: 18px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 600; font-size: 19px; }
.brand img { border-radius: 9px; }
header nav { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
header nav > a { color: var(--soft); text-decoration: none; padding: 8px 12px; border-radius: 999px; }
header nav > a[aria-current="page"] { color: var(--ink); background: var(--card); }

.language { position: relative; }
.language summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: 6px; padding: 8px 12px; border-radius: 999px; color: var(--soft); border: 1px solid var(--line); }
.language summary::-webkit-details-marker { display: none; }
.language ul { position: absolute; inset-inline-end: 0; top: calc(100% + 8px); margin: 0; padding: 8px; list-style: none; background: #10165a; border: 1px solid var(--line); border-radius: 14px; max-height: 60vh; overflow: auto; width: max-content; min-width: 180px; columns: 2; column-gap: 4px; z-index: 5; box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45); }
.language li a { display: block; padding: 6px 10px; border-radius: 8px; color: var(--ink); text-decoration: none; break-inside: avoid; }
.language li a:hover, .language li a[aria-current] { background: var(--card); }
.language li a[aria-current] { color: var(--amber); }

.hero { padding: 56px 0 28px; max-width: 760px; }
.hero.home { text-align: center; margin: 0 auto; padding-top: 40px; }
.hero .icon { border-radius: 22px; box-shadow: 0 0 60px rgba(255, 158, 26, 0.35); }
h1 { font-size: clamp(30px, 5.5vw, 50px); line-height: 1.18; margin: 18px 0 16px; letter-spacing: -0.01em; }
h2 { font-size: 23px; line-height: 1.3; margin: 0 0 10px; }
h3 { font-size: 19px; margin: 0 0 6px; }
.lead { font-size: clamp(18px, 2.4vw, 21px); color: var(--soft); margin: 0; }
.date { color: var(--faint); font-size: 15px; }

.points { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; padding: 28px 0; }
.points > div, .modes > div > div { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 22px; }
.points p, .modes p { color: var(--soft); margin: 0; }
.modes { padding: 20px 0 8px; }
.modes > h2 { text-align: center; margin-bottom: 18px; }
.modes > div { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.modes > p { text-align: center; margin-top: 26px; }

.button { display: inline-block; background: var(--amber); color: var(--amber-ink); font-weight: 600; text-decoration: none; padding: 12px 22px; border-radius: 14px; }

.layout { display: grid; grid-template-columns: 220px 1fr; gap: 40px; padding-bottom: 20px; }
aside nav { position: sticky; top: 20px; display: flex; flex-direction: column; gap: 2px; }
aside nav a { color: var(--soft); text-decoration: none; padding: 6px 10px; border-radius: 8px; font-size: 15px; }
aside nav a:hover { background: var(--card); color: var(--ink); }
article section { padding: 22px 0; border-top: 1px solid var(--line); scroll-margin-top: 16px; }
article section:first-child { border-top: 0; padding-top: 0; }
article p, article li { color: var(--soft); }
article strong { color: var(--ink); }
article ul, article ol { padding-inline-start: 22px; }
article li { margin: 6px 0; }

.contact { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; margin: 40px 0; padding: 26px; background: var(--card); border: 1px solid var(--line); border-radius: 22px; }
.contact p { color: var(--soft); margin: 0; }
.contact-links { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }

footer { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-block: 26px 40px; color: var(--faint); font-size: 15px; border-top: 1px solid var(--line); }
footer div { display: flex; gap: 16px; flex-wrap: wrap; }
footer a { color: var(--soft); text-decoration: none; }

@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; gap: 8px; }
  aside nav { position: static; flex-direction: row; flex-wrap: wrap; }
  .hero { padding-top: 32px; }
  .language ul { columns: 1; }
}