*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(900px 500px at 85% -10%, var(--bg-glow-1), transparent 60%),
    radial-gradient(700px 500px at -10% 30%, var(--bg-glow-2), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3 { line-height: 1.3; margin: 0; }
h1 { font-size: 1.55rem; }
h2 { font-size: 1.15rem; }
h3 { font-size: 1rem; }
p { margin: 0; }

.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: -999px; top: 8px; z-index: 100;
  background: var(--accent); color: var(--accent-ink); padding: 8px 14px; border-radius: 8px;
}
.skip-link:focus { left: 8px; }

/* ── 外殼：左側欄＋主欄 ── */
.shell { display: flex; min-height: 100vh; }

.sidebar {
  position: sticky; top: 0;
  width: var(--sidebar-w); height: 100vh; flex: none;
  display: flex; flex-direction: column; gap: 18px;
  padding: 22px 14px;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  backdrop-filter: blur(12px);
  border-right: 1px solid var(--border);
  z-index: 40;
}
.brand { display: flex; align-items: center; gap: 10px; padding: 0 8px; }
.brand-logo {
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; font-size: 22px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 30%, transparent), color-mix(in srgb, var(--accent-2) 30%, transparent));
  box-shadow: var(--glow);
}
.brand strong { display: block; font-size: 1.05rem; letter-spacing: .04em; }
.brand small { color: var(--muted); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; }

.nav { display: flex; flex-direction: column; gap: 4px; }
.nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-radius: var(--radius-sm);
  color: var(--text-2); font-weight: 500;
  transition: background .2s, color .2s, transform .2s var(--ease-out);
}
.nav a span { width: 22px; text-align: center; }
.nav a:hover { background: var(--surface-2); color: var(--text); text-decoration: none; transform: translateX(3px); }
.nav a[aria-current="page"] {
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 18%, transparent), transparent);
  color: var(--text);
  box-shadow: inset 3px 0 0 var(--accent);
}
.nav .soon {
  margin-left: auto; font-style: normal; font-size: .66rem; color: var(--muted);
  border: 1px solid var(--border); padding: 0 6px; border-radius: 99px;
}
.sidebar-foot { margin-top: auto; display: flex; flex-direction: column; gap: 10px; padding: 0 4px; }

.main-col { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar { display: none; }
main {
  flex: 1; width: 100%; max-width: 1240px; margin: 0 auto;
  padding: 28px 28px 40px;
  outline: none;
}
.footer {
  max-width: 1240px; width: 100%; margin: 0 auto; padding: 22px 28px 34px;
  border-top: 1px solid var(--border); color: var(--muted); font-size: .82rem;
  display: grid; gap: 6px;
}
.footer strong { color: var(--text-2); }

.backdrop { display: none; }

/* ── 手機與平板 ── */
@media (max-width: 900px) {
  .sidebar {
    position: fixed; left: 0; top: 0; bottom: 0;
    transform: translateX(-105%);
    transition: transform .3s var(--ease-out);
    box-shadow: var(--shadow);
    background: var(--surface);
  }
  .sidebar.is-open { transform: none; }
  .backdrop {
    display: block; position: fixed; inset: 0; z-index: 35;
    background: rgba(3, 6, 15, .55); backdrop-filter: blur(2px);
    opacity: 0; pointer-events: none; transition: opacity .3s;
  }
  .backdrop.is-open { opacity: 1; pointer-events: auto; }
  .topbar {
    display: flex; align-items: center; justify-content: space-between; gap: 10px;
    position: sticky; top: 0; z-index: 30;
    padding: 10px 16px; padding-top: max(10px, env(safe-area-inset-top));
    background: color-mix(in srgb, var(--surface) 85%, transparent);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
  }
  .brand-mini { color: var(--text); font-weight: 700; letter-spacing: .03em; }
  main { padding: 18px 16px 32px; }
  .footer { padding: 18px 16px 28px; }
}

/* ── 共用排版格線 ── */
.page-head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 12px; margin-bottom: 20px; }
.page-head p { color: var(--muted); margin-top: 4px; }
.stack { display: flex; flex-direction: column; gap: 20px; }
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
.grid-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.spacer { flex: 1; }
@media (max-width: 760px) {
  .grid-2 { grid-template-columns: 1fr; }
  .grid-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}