:root{
    --bg-base: #11151C;
    --bg-elevated: #211D19;
    --bg-card: #2A2522;
    --amber: #E5A63E;
    --amber-deep: #C98727;
    --neon-pink: #FF3D9A;
    --text-primary: #F4F1EC;
    --text-secondary: #B8B3AA;
    --text-tertiary: #948F86;
    --divider: #3A342C;
  }
  * { box-sizing: border-box; }
  body {
    margin: 0;
    background: var(--bg-base);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
  }
  a { color: var(--amber); }
  .wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }

  .nav {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(17, 21, 28, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--divider);
  }
  .nav .wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 14px;
    padding-bottom: 14px;
    max-width: 760px;
  }
  .brand {
    font-weight: 800;
    letter-spacing: 0.06em;
    font-size: 16px;
    color: var(--neon-pink);
    text-decoration: none;
  }
  .nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 16px;
  }
  .nav-links a:hover { color: var(--amber); }
  .nav-links a { position: relative; }
  /* Invisible 44x44 hit-slop: expands the tap target without affecting
     visual size/background (important for .lang-toggle button, whose
     background fills the padding box — real padding would visibly grow
     the active pill). */
  .nav-links a::after,
  .lang-toggle button::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    min-width: 44px;
    min-height: 44px;
    transform: translate(-50%, -50%);
  }

  main { padding: 56px 0 72px; }

  h1 {
    font-size: 28px;
    margin: 0 0 6px;
  }
  .subtitle {
    color: var(--text-tertiary);
    font-size: 15px;
    margin: 0 0 40px;
  }

  .summary-box {
    background: var(--bg-card);
    border: 1px solid var(--divider);
    border-radius: 18px;
    padding: 24px 28px;
    margin-bottom: 40px;
  }
  .summary-box p {
    margin: 0;
    font-size: 17px;
    color: var(--text-primary);
  }
  .summary-box p + p { margin-top: 10px; }

  h2 {
    font-size: 18px;
    margin: 40px 0 12px;
    padding-top: 8px;
    border-top: 1px solid var(--divider);
  }
  h2:first-of-type { border-top: none; padding-top: 0; }

  p, li { color: var(--text-secondary); font-size: 17px; }
  ul { padding-left: 20px; }
  li + li { margin-top: 6px; }

  .contact {
    background: var(--bg-elevated);
    border: 1px solid var(--divider);
    border-radius: 18px;
    padding: 22px 26px;
    margin-top: 40px;
  }
  .contact p { margin: 0; color: var(--text-primary); }
  .contact a { font-weight: 700; }

  footer {
    border-top: 1px solid var(--divider);
    padding: 32px 0 48px;
  }
  footer .wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
    color: var(--text-tertiary);
    max-width: 760px;
  }
  footer a { color: var(--text-tertiary); text-decoration: underline; }
  footer a:hover { color: var(--amber); }

  /* ---------- Lang toggle ---------- */
  .lang-toggle {
    display: flex;
    align-items: center;
    gap: 2px;
    background: var(--bg-elevated);
    border: 1px solid var(--divider);
    border-radius: 999px;
    padding: 3px;
  }
  .lang-toggle button {
    position: relative;
    appearance: none;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.02em;
    padding: 5px 11px;
    border-radius: 999px;
    cursor: pointer;
    font-family: inherit;
  }
  .lang-toggle button.active {
    background: var(--amber);
    color: #211D19;
  }
  .nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
  }

  /* ---------- Lang blocks ---------- */
  .lang-zh, .lang-en { display: none; }
  html[data-lang="zh"] .lang-zh { display: initial; }
  html[data-lang="en"] .lang-en { display: initial; }
  html[data-lang="zh"] li.lang-zh,
  html[data-lang="zh"] p.lang-zh,
  html[data-lang="zh"] div.lang-zh { display: block; }
  html[data-lang="en"] li.lang-en,
  html[data-lang="en"] p.lang-en,
  html[data-lang="en"] div.lang-en { display: block; }
  /* noscript / no-JS fallback: default to zh */
  html:not([data-lang]) .lang-zh { display: initial; }
  html:not([data-lang]) li.lang-zh,
  html:not([data-lang]) p.lang-zh,
  html:not([data-lang]) div.lang-zh { display: block; }
  html:not([data-lang]) .lang-en { display: none; }

  @media (max-width: 600px) {
    main { padding: 40px 0 56px; }
    h1 { font-size: 24px; }
  }