/* TechTypo design tokens and base styles. Light/dark via prefers-color-scheme. */
:root {
  --bg: #fafaf7;
  --bg-elev: #ffffff;
  --fg: #1a1a1a;
  --fg-muted: #5c5c57;
  --line: #e4e2dc;
  --accent: #0f6b4f;
  --accent-fg: #ffffff;
  --accent-soft: #e3f2ec;
  --danger: #b42318;
  --danger-soft: #fde8e6;
  --warn: #9a6700;
  --warn-soft: #fff4d6;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --max: 1040px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121311; --bg-elev: #1b1d1a; --fg: #ecebe6; --fg-muted: #a5a49d; --line: #2c2f2b;
    --accent: #4fc49a; --accent-fg: #0b1f17; --accent-soft: #163327;
    --danger: #ff8a80; --danger-soft: #3a1d1b; --warn: #e2b53c; --warn-soft: #3a2f12;
  }
}
:root[data-theme="dark"] {
  --bg: #121311; --bg-elev: #1b1d1a; --fg: #ecebe6; --fg-muted: #a5a49d; --line: #2c2f2b;
  --accent: #4fc49a; --accent-fg: #0b1f17; --accent-soft: #163327;
  --danger: #ff8a80; --danger-soft: #3a1d1b; --warn: #e2b53c; --warn-soft: #3a2f12;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.55 var(--font); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; letter-spacing: -0.01em; }
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h2 { font-size: clamp(1.3rem, 2.6vw, 1.7rem); margin-top: 2rem; }
h3 { font-size: 1.1rem; margin-top: 1.4rem; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
.site-header { border-bottom: 1px solid var(--line); background: var(--bg-elev); position: sticky; top: 0; z-index: 10; }
.site-header .wrap { display: flex; align-items: center; gap: 1rem; min-height: 56px; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--fg); letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
.nav { display: flex; gap: .25rem; margin-left: auto; flex-wrap: wrap; }
.nav a { color: var(--fg-muted); padding: .4rem .6rem; border-radius: 6px; font-size: .95rem; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--fg); background: var(--accent-soft); text-decoration: none; }
.nav .cta { color: var(--accent-fg); background: var(--accent); }
.nav .cta:hover { background: var(--accent); filter: brightness(1.08); }
main { padding: 2rem 0 4rem; }
.hero { padding: 2.5rem 0 1.5rem; }
.hero .lede { font-size: 1.15rem; color: var(--fg-muted); max-width: 60ch; }
.card { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; }
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.btn { display: inline-block; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-fg); padding: .6rem 1.1rem; border-radius: 8px; font: inherit; font-weight: 600; cursor: pointer; }
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn.secondary { background: transparent; color: var(--accent); }
.btn.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-row { display: flex; gap: .6rem; flex-wrap: wrap; align-items: center; }
label { display: block; font-weight: 600; margin: .8rem 0 .3rem; font-size: .95rem; }
input, select, textarea { width: 100%; font: inherit; color: var(--fg); background: var(--bg-elev); border: 1px solid var(--line); border-radius: 8px; padding: .55rem .7rem; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.hint { color: var(--fg-muted); font-size: .9rem; }
.muted { color: var(--fg-muted); }
.notice { border-radius: 8px; padding: .75rem 1rem; margin: 1rem 0; border: 1px solid var(--line); background: var(--bg-elev); }
.notice.ok { background: var(--accent-soft); border-color: var(--accent); }
.notice.err { background: var(--danger-soft); border-color: var(--danger); }
.notice.warn { background: var(--warn-soft); border-color: var(--warn); }
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; padding: .55rem .5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--fg-muted); font-weight: 600; font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; }
code, kbd { font-family: var(--mono); font-size: .92em; background: var(--accent-soft); padding: .1em .35em; border-radius: 4px; }
.stat { display: flex; flex-direction: column; gap: .15rem; }
.stat b { font-size: 1.7rem; line-height: 1.1; }
.stat span { color: var(--fg-muted); font-size: .85rem; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 1rem; }
.badge { display: inline-block; font-size: .8rem; padding: .15rem .5rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.badge.fail { background: var(--danger-soft); color: var(--danger); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.site-footer { border-top: 1px solid var(--line); color: var(--fg-muted); font-size: .9rem; padding: 1.5rem 0; }
.site-footer .wrap { display: flex; gap: 1rem; flex-wrap: wrap; justify-content: space-between; }
.faq details { border-top: 1px solid var(--line); padding: .6rem 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.prose { max-width: 70ch; }
.prose ul, .prose ol { padding-left: 1.3rem; }
.two-col { display: grid; gap: 2rem; grid-template-columns: 1fr; }
@media (min-width: 820px) { .two-col { grid-template-columns: 2fr 1fr; } }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* Test engine */
.test-shell { max-width: 820px; margin: 0 auto; }
.test-bar { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; margin-bottom: 1rem; }
.test-bar .timer { font-family: var(--mono); font-size: 1.4rem; font-weight: 700; min-width: 4.5ch; }
.passage { font-family: var(--mono); font-size: 1.25rem; line-height: 1.9; padding: 1.25rem; background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); white-space: pre-wrap; word-break: break-word; user-select: none; -webkit-user-select: none; min-height: 7em; }
.passage .ok { color: var(--fg); }
.passage .err { color: var(--danger); background: var(--danger-soft); border-radius: 3px; }
.passage .cur { background: var(--accent-soft); outline: 2px solid var(--accent); border-radius: 3px; }
.passage .todo { color: var(--fg-muted); }
.typing-input { font-family: var(--mono); font-size: 1.1rem; margin-top: .75rem; }
.tenkey-grid { font-family: var(--mono); font-size: 1.35rem; display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: .5rem; }
.tenkey-grid .cell { padding: .5rem .75rem; border: 1px solid var(--line); border-radius: 8px; background: var(--bg-elev); }
.de-form { display: grid; gap: .5rem; grid-template-columns: 1fr 1fr; }
@media (max-width: 600px) { .de-form { grid-template-columns: 1fr; } }
.de-record { font-family: var(--mono); background: var(--bg-elev); border: 1px solid var(--line); border-radius: 8px; padding: .75rem; }
.cert { background: #fff; color: #111; border: 6px double #0f6b4f; padding: 2rem; max-width: 760px; margin: 0 auto; font-family: Georgia, "Times New Roman", serif; }
.cert h1 { font-family: var(--font); color: #0f6b4f; }
.cert .big { font-size: 2.2rem; font-weight: 700; }
.cert .mono { font-family: var(--mono); font-size: .8rem; word-break: break-all; }
@media print { .site-header, .site-footer, .no-print { display: none !important; } body { background: #fff; } main { padding: 0; } }