/* ============================================================
   Bitsu — bitsu.ai
   Hand-written, no build step, no external dependencies.
   Light palette on :root, dark overrides in the media query.
   ============================================================ */

:root {
  --bg:        #fbfaf8;
  --surface:   #ffffff;
  --ink:       #14171c;
  --ink-2:     #565d66;
  --ink-3:     #7d848d;
  --rule:      #e6e3dd;
  --rule-soft: #efece6;

  --accent:      #0c6b63;
  --accent-hi:   #0a5750;
  --accent-ink:  #ffffff;
  --accent-tint: #e8f2f0;

  /* inverted band — dark in both themes */
  --band-bg:    #14171c;
  --band-ink:   #f2f1ee;
  --band-ink-2: #a2a8b0;
  --band-rule:  #2a2f37;
  --band-acc:   #4dc0b2;

  --alt-bg: #f4f2ed;

  --shadow: 0 1px 2px rgba(20, 23, 28, .04), 0 8px 24px -12px rgba(20, 23, 28, .12);

  --wrap: 68rem;
  --measure: 42rem;

  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #0f1114;
    --surface:   #171a1f;
    --ink:       #eceef1;
    --ink-2:     #9aa1ab;
    --ink-3:     #79808a;
    --rule:      #262a31;
    --rule-soft: #1f232a;

    --accent:      #45b8aa;
    --accent-hi:   #63cabd;
    --accent-ink:  #0c1512;
    --accent-tint: #14231f;

    --band-bg:    #171a20;
    --band-ink:   #eceef1;
    --band-ink-2: #9aa1ab;
    --band-rule:  #2c313a;
    --band-acc:   #45b8aa;

    --alt-bg: #13161a;

    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px -12px rgba(0, 0, 0, .6);
  }
}

/* ---------- reset-ish ---------- */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { line-height: 1.15; letter-spacing: -.021em; margin: 0 0 .6em; text-wrap: balance; }
h1 { font-size: clamp(2.15rem, 1.35rem + 3.4vw, 3.9rem); font-weight: 660; letter-spacing: -.031em; }
h2 { font-size: clamp(1.6rem, 1.15rem + 1.9vw, 2.5rem); font-weight: 640; }
h3 { font-size: 1.125rem; font-weight: 640; letter-spacing: -.012em; }

p { margin: 0 0 1.15em; max-width: var(--measure); }
a { color: inherit; }
strong { font-weight: 640; }
em { font-style: italic; }

.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 {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--accent-ink);
  padding: .7rem 1.1rem; border-radius: 0 0 .5rem 0; text-decoration: none; font-weight: 600;
}
.skip:focus { left: 0; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

/* ---------- layout ---------- */

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: clamp(1.25rem, 5vw, 2.5rem); }
/* Narrow sections keep the same left edge as every other section — only the
   content column gets shorter, so the page never shifts sideways as you scroll. */
.wrap.narrow > * { max-width: 46rem; }

.band { padding-block: clamp(3.75rem, 8vw, 7rem); border-top: 1px solid var(--rule); }
.band-alt { background: var(--alt-bg); }
.band-ink { background: var(--band-bg); color: var(--band-ink); border-top-color: var(--band-rule); }
.band-ink h2, .band-ink h3 { color: var(--band-ink); }
.band-ink .muted, .band-ink .kicker { color: var(--band-ink-2); }

.intro { font-size: 1.16rem; color: var(--ink-2); max-width: 44rem; }
.muted { color: var(--ink-2); }

.kicker {
  margin-top: 2.25rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--rule);
  color: var(--ink-2);
  font-size: .975rem;
  /* Rule spans the full section while the text still wraps at a readable
     measure — padding, not max-width, so every divider is the same length. */
  max-width: none;
  padding-right: max(0rem, calc(100% - 46rem));
}
.band-ink .kicker { border-top-color: var(--band-rule); }
.band-alt .kicker { border-top-color: #ddd9d1; }
@media (prefers-color-scheme: dark) { .band-alt .kicker { border-top-color: var(--rule); } }

/* ---------- header ---------- */

.site-head { border-bottom: 1px solid var(--rule); background: var(--bg); }
.head-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 4.25rem; }

.wordmark {
  display: inline-flex; align-items: center; gap: .55rem;
  font-weight: 680; font-size: 1.15rem; letter-spacing: -.028em;
  text-decoration: none; color: var(--ink);
}
.mark {
  width: 1.4rem; height: 1.4rem; border-radius: .42rem;
  background: var(--accent); flex: none;
  position: relative;
}
.mark::after {
  content: ""; position: absolute; inset: 0;
  background: var(--accent-ink);
  clip-path: polygon(34% 22%, 34% 78%, 48% 64%, 58% 82%, 68% 76%, 58% 59%, 74% 57%);
}

/* ---------- buttons ---------- */

.btn {
  display: inline-block; text-decoration: none; font-weight: 600;
  font-size: .96rem; line-height: 1.2; letter-spacing: -.008em;
  padding: .78rem 1.35rem; border-radius: .55rem;
  border: 1px solid transparent;
  transition: background-color .15s ease, border-color .15s ease, transform .15s ease;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent-hi); }
.btn-ghost { border-color: var(--rule); color: var(--ink); background: transparent; }
.btn-ghost:hover { border-color: var(--ink-3); }
.btn-lg { font-size: 1.08rem; padding: .95rem 1.9rem; font-family: var(--mono); letter-spacing: -.01em; }
.btn:active { transform: translateY(1px); }

/* ---------- hero ---------- */

.hero { padding-block: clamp(3.5rem, 9vw, 8rem) clamp(3.25rem, 7vw, 6rem); }
.hero h1 { max-width: 20ch; }
.eyebrow {
  font-family: var(--mono); font-size: .78rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 1.4rem; font-weight: 600;
}
.lede { font-size: clamp(1.09rem, 1rem + .4vw, 1.28rem); color: var(--ink-2); max-width: 40rem; }

.chips { list-style: none; display: flex; flex-wrap: wrap; gap: .5rem; padding: 0; margin: 2rem 0 2.5rem; }
.chips li {
  font-family: var(--mono); font-size: .78rem; letter-spacing: .01em;
  padding: .4rem .7rem; border-radius: .4rem;
  background: var(--accent-tint); color: var(--accent-hi);
  border: 1px solid transparent;
}
@media (prefers-color-scheme: dark) { .chips li { color: var(--accent); border-color: #1e3a35; } }

.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 1.1rem 1.5rem; }
.proof { margin: 0; font-size: .93rem; color: var(--ink-2); max-width: 27rem; }

/* ---------- cards ---------- */

.cards { display: grid; gap: 1.15rem; margin-top: 2.5rem; }
.cards.three { grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
.cards.two   { grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr)); }

.card {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: .8rem;
  padding: 1.5rem 1.5rem 1.15rem;
  box-shadow: var(--shadow);
}
.card h3 { color: var(--accent); margin-bottom: .5rem; }
.card p { color: var(--ink-2); font-size: .965rem; margin: 0; max-width: none; }

/* ---------- results / stat ---------- */

.stat-lead { display: grid; grid-template-columns: auto 1fr; gap: 1rem 3rem; align-items: start; }
@media (max-width: 46rem) { .stat-lead { grid-template-columns: 1fr; gap: .5rem; } }

.stat-figure { margin: 0; line-height: .82; }
.stat-figure > span {
  font-size: clamp(5rem, 3rem + 11vw, 11rem);
  font-weight: 680; letter-spacing: -.05em;
  color: var(--band-acc);
  display: inline-block;
}
.pct { font-size: .42em; letter-spacing: -.02em; vertical-align: .55em; margin-left: .05em; }

.stat-body { padding-top: clamp(0rem, 1.5vw, 1.1rem); }
.stat-body h2 { margin-bottom: .55em; max-width: 16ch; }
.stat-body p { color: var(--band-ink-2); max-width: 38rem; }
.stat-body p em { color: var(--band-ink); font-style: normal; font-weight: 620; }

.quality {
  display: grid; grid-template-columns: 1fr auto; gap: 1.5rem 3rem;
  align-items: center;
  margin-top: 3.5rem; padding-top: 2.5rem; border-top: 1px solid var(--band-rule);
}
@media (max-width: 46rem) { .quality { grid-template-columns: 1fr; } }
.quality-text h3 { margin-bottom: .45em; }
.quality-text p { color: var(--band-ink-2); font-size: .975rem; margin: 0; }

.qtable { border-collapse: collapse; font-variant-numeric: tabular-nums; }
.qtable caption { text-align: left; }
.qtable th, .qtable td { padding: .6rem 1.15rem; text-align: right; }
.qtable thead th { font-size: .76rem; letter-spacing: .07em; text-transform: uppercase; color: var(--band-ink-2); font-weight: 600; border-bottom: 1px solid var(--band-rule); }
.qtable tbody th { text-align: left; font-weight: 500; color: var(--band-ink-2); padding-left: 0; }
.qtable tbody td { font-size: 1.5rem; font-weight: 620; color: var(--band-ink-2); }
.qtable td.win { color: var(--band-acc); }
.qtable tbody tr + tr th, .qtable tbody tr + tr td { border-top: 1px solid var(--band-rule); }

.pullquote {
  margin: 2.75rem 0 0;
  font-size: clamp(1.2rem, 1rem + 1vw, 1.65rem);
  font-weight: 620; letter-spacing: -.02em; line-height: 1.3;
  color: var(--band-ink); max-width: 30ch;
}

/* ---------- steps ---------- */

.steps { list-style: none; padding: 0; margin: 2.5rem 0 0; display: grid; gap: 1.15rem; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); }
.steps > li { background: var(--surface); border: 1px solid var(--rule); border-radius: .8rem; padding: 1.5rem; box-shadow: var(--shadow); }
.step-n { font-family: var(--mono); font-size: .8rem; color: var(--accent); margin: 0 0 .9rem; letter-spacing: .06em; font-weight: 600; }
.steps h3 { margin-bottom: .45em; }
.steps p { color: var(--ink-2); font-size: .965rem; margin: 0; max-width: none; }

/* ---------- split ---------- */

.split { display: grid; gap: 1.15rem; grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr)); margin-top: 2.5rem; }
.split-col { border: 1px solid var(--rule); border-radius: .8rem; padding: 1.6rem; background: var(--surface); }
.split-col-on { border-color: var(--accent); background: var(--accent-tint); }
@media (prefers-color-scheme: dark) { .split-col-on { border-color: #23514a; } }
.split-label { font-family: var(--mono); font-size: .74rem; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 .8rem; font-weight: 600; }
.split-col-on .split-label { color: var(--accent); }
.split-col h3 { margin-bottom: .5em; }
.split-col p { margin: 0; color: var(--ink-2); font-size: .975rem; max-width: none; }

/* ---------- comparison table ---------- */

.table-scroll { overflow-x: auto; margin-top: 2.5rem; -webkit-overflow-scrolling: touch; }
.ctable { border-collapse: collapse; width: 100%; min-width: 40rem; font-size: .95rem; }
.ctable th, .ctable td { padding: .85rem 1rem; text-align: center; border-bottom: 1px solid var(--rule); }
.ctable thead th { font-size: .84rem; font-weight: 620; color: var(--ink-2); vertical-align: bottom; }
.ctable thead th.us { color: var(--accent); background: var(--accent-tint); border-radius: .5rem .5rem 0 0; }
.th-sub { display: block; font-weight: 400; font-size: .76rem; color: var(--ink-3); margin-top: .15rem; }
.ctable tbody th { text-align: left; font-weight: 500; color: var(--ink); min-width: 17rem; }
.ctable td { font-size: 1.05rem; color: var(--ink-3); }
.ctable td[data-v="yes"] { color: var(--accent); }
.ctable td.us { background: var(--accent-tint); font-weight: 700; }
.ctable tbody tr:last-child th, .ctable tbody tr:last-child td { border-bottom: 0; }

.legend { display: flex; flex-wrap: wrap; gap: .4rem 1.4rem; margin: .9rem 0 0; font-size: .82rem; color: var(--ink-3); }

/* ---------- faq / risks ---------- */

.faq { margin: 2.5rem 0 0; display: grid; gap: 0; }
.faq > div { display: grid; grid-template-columns: 12rem 1fr; gap: 1rem 2.5rem; padding: 1.5rem 0; border-top: 1px solid var(--rule); }
.faq > div:last-child { border-bottom: 1px solid var(--rule); }
@media (max-width: 44rem) { .faq > div { grid-template-columns: 1fr; gap: .35rem; } }
.faq dt { font-weight: 640; font-size: 1.05rem; letter-spacing: -.012em; }
.faq dd { margin: 0; color: var(--ink-2); font-size: .975rem; }

/* ---------- ticks ---------- */

.ticks { list-style: none; padding: 0; margin: 1.4rem 0 1.6rem; display: grid; gap: .7rem; max-width: var(--measure); }
.ticks li { position: relative; padding-left: 1.8rem; color: var(--ink-2); }
.ticks li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--accent); font-weight: 700;
}
.ticks strong { color: var(--ink); }

/* ---------- final cta ---------- */

.final p { color: var(--band-ink-2); max-width: 40rem; }
.final strong { color: var(--band-ink); }
.cta-final { margin-top: 2rem; }

/* ---------- footer ---------- */

.site-foot { border-top: 1px solid var(--rule); padding-block: 2.5rem 3rem; }
.foot-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 2rem; }
.foot-inner p { margin: 0; font-size: .92rem; max-width: none; }
.site-foot a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }

/* ---------- print ---------- */

@media print {
  .site-head, .skip, .btn { display: none; }
  body { background: #fff; color: #000; }
  .band, .band-ink, .band-alt { background: #fff !important; color: #000 !important; }
}

/* ---------- small-screen tightening ---------- */

@media (max-width: 46rem) {
  .quality { margin-top: 2.25rem; padding-top: 1.75rem; }
  .stat-figure > span { line-height: 1; }
  .cta-row { gap: 1rem; }
  .proof { max-width: none; }
  .btn { width: auto; }
}

@media (max-width: 30rem) {
  .cta-row .btn-primary { width: 100%; text-align: center; }
}