/* Page frame: top strip, the tool, the explainer, footer. No hero. */
*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: light dark; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 16px/1.55 var(--font-body);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-ink); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
code, kbd, pre, .mono { font-family: var(--font-mono); font-size: 0.92em; }
pre { white-space: pre-wrap; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; line-height: 1.15; margin: 0; }
p { margin: 0 0 1em; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 var(--gutter); }

/* top strip */
.top {
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
  padding: 18px 0 14px;
  border-bottom: 1px solid var(--line);
}
.top .name { font-family: var(--font-display); font-weight: 700; font-size: 20px; letter-spacing: -0.01em; }
.top .name small { font-family: var(--font-mono); font-weight: 400; font-size: 12px; color: var(--muted); margin-left: 8px; }
.top .tagline { color: var(--ink-2); flex: 1 1 320px; margin: 0; }
.top nav { display: flex; gap: 18px; font-size: 14px; }

/* the tool */
.tool { margin: 28px 0 56px; }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); position: relative; }
.tabs [role="tab"] {
  background: none; border: 0; padding: 10px 14px; cursor: pointer; color: var(--muted);
  font-weight: 500; transition: color var(--t-fast) var(--ease-snap);
}
.tabs [role="tab"]:hover { color: var(--ink); }
.tabs [role="tab"][aria-selected="true"] { color: var(--ink); }
.tabs .indicator {
  position: absolute; bottom: -1px; height: 2px; background: var(--accent);
  transition: transform var(--t-move) var(--ease-out), width var(--t-move) var(--ease-out);
}
.panel { padding-top: 22px; }

/* explainer */
.explain { border-top: 1px solid var(--line); padding: 48px 0 24px; }
.explain h2 { font-size: clamp(22px, 2.6vw, 30px); margin-bottom: 10px; }
.explain h3 { font-size: 18px; margin: 28px 0 8px; }
.explain .prose { max-width: var(--measure); color: var(--ink-2); }
.explain .prose p { margin-bottom: 0.9em; }
.explain .cols { display: grid; grid-template-columns: 1fr; gap: 24px 40px; }
@media (min-width: 900px) { .explain .cols { grid-template-columns: 1.1fr 0.9fr; } }
.explain table { border-collapse: collapse; width: 100%; font-size: 14px; }
.explain th, .explain td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.explain th { font-weight: 600; color: var(--ink); }
.explain .table-wrap { overflow-x: auto; }
.limits { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; font-size: 14px; color: var(--ink-2); }
.limits ul { margin: 6px 0 0; padding-left: 18px; }
.limits li { margin: 4px 0; }

footer { border-top: 1px solid var(--line); padding: 20px 0 40px; font-size: 13px; color: var(--muted); display: flex; gap: 18px; flex-wrap: wrap; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}