/* Redline OS — landing page.
 *
 * Loaded only on `/`. The questionnaire does not pay for any of this.
 *
 * Section 7's brief still governs the identity: drawing paper, hairlines, title blocks,
 * clause numbering, redline used once. What changed on 2026-08-01 is that motion is now
 * allowed (docs/decisions.md D-015) — so the page sequences attention rather than
 * presenting everything at once.
 */

.landing main { padding: 0; }
.wrap { max-width: 68rem; margin: 0 auto; padding-inline: var(--gutter); }
.narrow { max-width: 46rem; }

section { padding-block: var(--s8); border-bottom: 1px solid var(--rule); }
section:last-of-type { border-bottom: 0; }

.section-label {
  font-family: var(--display);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.625rem;
  font-weight: 600;
  color: var(--stamp);
  display: flex;
  align-items: center;
  gap: var(--s3);
  margin: 0 0 var(--s5);
  max-width: none;
}
.section-label::after { content: ""; flex: 1; height: 1px; background: var(--rule); }

h2.big {
  font-family: var(--display);
  font-size: clamp(1.75rem, 5.5vw, 2.75rem);
  line-height: 1.06;
  letter-spacing: -0.022em;
  font-weight: 700;
  margin: 0 0 var(--s4);
  text-wrap: balance;
}

/* ========================================================================== hero */

.hero {
  padding-block: var(--s8) var(--s7);
  border-bottom: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
}

/* Drawing grid, drawn in CSS so it survives images being blocked. */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--rule-2) 1px, transparent 1px),
    linear-gradient(to bottom, var(--rule-2) 1px, transparent 1px);
  background-size: 3.5rem 3.5rem;
  mask-image: radial-gradient(120% 90% at 78% 0%, #000 0%, transparent 68%);
  opacity: 0.75;
  pointer-events: none;
}
.hero > * { position: relative; }

.hero h1 {
  font-size: clamp(2.5rem, 9vw, 5.25rem);
  line-height: 0.98;
  letter-spacing: -0.032em;
  margin: 0 0 var(--s5);
  max-width: 18ch;
}

.hero .lede { font-size: clamp(1.0625rem, 2.4vw, 1.375rem); max-width: 38ch; }

.hero-actions { display: flex; flex-wrap: wrap; gap: var(--s4); align-items: center; margin-top: var(--s6); }
.hero-actions .cta { width: auto; min-width: 15rem; }
.hero-meta { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-3); letter-spacing: 0.01em; }

/* ------------------------------------------------- the thesis: before and after */

.thesis { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); margin-top: var(--s8); }
.thesis-side { background: var(--surface); padding: var(--s5) var(--s4); min-width: 0; }
.thesis-side h3 {
  font-family: var(--display);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.625rem;
  font-weight: 600;
  color: var(--ink-3);
  margin: 0 0 var(--s4);
}
.thesis-side.after h3 { color: var(--stamp); }

.rawclause {
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.75;
  color: var(--ink-3);
  margin: 0;
  max-width: none;
  white-space: pre-wrap;
  word-break: break-word;
}
.rawclause em { font-style: normal; color: var(--ink); background: #FFF3C4; padding: 0 0.125rem; }

.rowout { display: grid; gap: 1px; background: var(--rule-2); border: 1px solid var(--rule-2); }
.rowout div { background: #FFFFFF; display: grid; grid-template-columns: 8.5rem 1fr; gap: var(--s3); padding: 0.5rem 0.625rem; }
.rowout dt, .rowout .k {
  font-family: var(--display);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.5625rem;
  font-weight: 600;
  color: var(--ink-3);
  align-self: center;
}
.rowout .v { font-family: var(--mono); font-size: 0.8125rem; color: var(--ink); overflow-wrap: anywhere; }
.rowout .v.must { color: var(--redline); font-weight: 700; }

.thesis-note { font-size: 0.8125rem; color: var(--ink-3); margin: var(--s4) 0 0; max-width: none; }

/* ==================================================================== deliverables */

.pair { display: grid; gap: var(--s5); }
.card {
  border: 1px solid var(--rule);
  background: var(--surface);
  padding: var(--s5) var(--s4) var(--s6);
  position: relative;
}
.card .n { font-family: var(--mono); font-size: 0.6875rem; color: var(--redline); display: block; margin-bottom: var(--s3); }
.card h3 { font-family: var(--display); font-size: 1.375rem; letter-spacing: -0.015em; font-weight: 700; margin: 0 0 var(--s3); }
.card p { font-size: 0.9375rem; color: var(--ink-2); max-width: none; margin: 0 0 var(--s3); }
.card ul { margin: 0; padding-left: 1.125rem; font-size: 0.9375rem; color: var(--ink-2); }
.card li { margin-bottom: var(--s1); }
.card .tagline {
  font-family: var(--display);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.625rem;
  color: var(--stamp);
  margin-top: var(--s4);
}

/* ========================================================================= lenses */

.lenslist { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.lenslist li {
  display: grid;
  grid-template-columns: 2.25rem 1fr auto;
  gap: var(--s4);
  align-items: baseline;
  padding: var(--s4) 0 var(--s3);
  border-bottom: 1px solid var(--rule-2);
}
.lenslist .ref { font-family: var(--mono); font-size: 0.6875rem; color: var(--ink-3); }
.lenslist .nm { font-size: 1.0625rem; font-weight: 600; letter-spacing: -0.012em; }
.lenslist .wt { font-family: var(--mono); font-size: 0.9375rem; color: var(--stamp); font-variant-numeric: tabular-nums; }
.lenslist .bar { grid-column: 2 / -1; }

/* ========================================================================== bands */

.bandgrid { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.bandcell { background: var(--surface); padding: var(--s4); }
.bandcell .r { font-family: var(--mono); font-size: 0.6875rem; color: var(--ink-3); display: block; }
.bandcell .l {
  font-family: var(--display);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.8125rem;
  font-weight: 600;
  margin-top: var(--s2);
  display: block;
}
.bandcell:last-child .l { color: var(--redline); }

/* ====================================================================== the maths */

.maths { display: grid; gap: var(--s5); }
.workings {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--flag);
  background: var(--surface);
  padding: var(--s4);
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.9;
  color: var(--ink-2);
  overflow-x: auto;
}
.workings .sum { color: var(--ink); font-weight: 700; border-top: 1px solid var(--rule); display: block; margin-top: var(--s2); padding-top: var(--s2); }
.workings .capped { color: var(--redline); }

/* ====================================================================== final CTA */

.close { text-align: center; background: var(--surface); }
.close h2.big { max-width: 20ch; margin-inline: auto; }
.close p { margin-inline: auto; }
.close .cta { margin-top: var(--s6); width: auto; min-width: 18rem; }

/* ==================================================================== wider screens */

@media (min-width: 46rem) {
  section { padding-block: calc(var(--s8) * 1.5); }
  .thesis { grid-template-columns: 1fr 1fr; }
  .pair { grid-template-columns: 1fr 1fr; gap: var(--s6); }
  .bandgrid { grid-template-columns: repeat(5, 1fr); }
  .maths { grid-template-columns: 1fr 1fr; align-items: start; gap: var(--s7); }
  .hero { padding-block: calc(var(--s8) * 1.75) var(--s8); }
}