:root {
  color-scheme: light;
  --page: #f4f4f1; --panel: #fcfcfb; --ink: #0d1117; --ink2: #4b4f56; --ink3: #767a80; --line: #e2e1db; --wash: #ecebe5;
  --accent: #2a63d6; --accent-soft: #e4ebfa; --good: #1a7f4b; --warn: #a45f00; --bad: #c22f2e;
  --f-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --f-body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #121211; --panel: #1a1a19; --ink: #f4f4f1; --ink2: #c3c2b7; --ink3: #8f8e86; --line: #2f2f2c; --wash: #232321;
    --accent: #6c9bf0; --accent-soft: #1c2740; --good: #3fbf7f; --warn: #e0a030; --bad: #ef7776;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #121211; --panel: #1a1a19; --ink: #f4f4f1; --ink2: #c3c2b7; --ink3: #8f8e86; --line: #2f2f2c; --wash: #232321;
  --accent: #6c9bf0; --accent-soft: #1c2740; --good: #3fbf7f; --warn: #e0a030; --bad: #ef7776;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--page); color: var(--ink); font: 400 16px/1.6 var(--f-body); }
.wrap { max-width: 1120px; margin: 0 auto; padding-inline: 20px; padding-block: 28px 56px; }
h1, h2, h3 { font-family: var(--f-display); text-wrap: balance; margin: 0; letter-spacing: -0.015em; }
p { margin: 0; }
a { color: var(--accent); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.eyebrow { font: 500 12px/1.2 var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink3); }
.mono { font-family: var(--f-mono); font-variant-numeric: tabular-nums; }

/* hero */
.hero { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 40px; align-items: center; padding-block: 24px 40px; }
.hero h1 { font-size: clamp(34px, 5.2vw, 56px); line-height: 1.04; font-weight: 700; margin: 14px 0 18px; }
.hero .lede { font-size: 18px; color: var(--ink2); max-width: 56ch; }
.hero-facts { display: grid; gap: 12px; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line); }
.hero-facts .f { display: grid; grid-template-columns: 98px minmax(0, 1fr); gap: 4px 14px; }
.hero-facts .f b { font: 600 11px/1.5 var(--f-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--accent); }
.hero-facts .f p { font-size: 14.5px; color: var(--ink2); margin: 0; }
.hero-facts .f .grade { margin-left: 4px; }
.meta { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 22px; font-size: 13px; color: var(--ink3); }
.meta b { color: var(--ink2); font-weight: 600; }
.cta { display: inline-block; margin-top: 22px; background: var(--accent); color: #fff; text-decoration: none; font-weight: 600; padding: 11px 18px; border-radius: 10px; }
.cta:hover { filter: brightness(1.08); }
.receipt { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; box-shadow: 0 1px 0 var(--line), 0 18px 40px -28px rgba(0,0,0,.35); }
.receipt .big { font: 700 34px/1.1 var(--f-display); margin: 6px 0 12px; }
.receipt .r { display: flex; justify-content: space-between; gap: 12px; padding: 6px 0; border-top: 1px dashed var(--line); font-size: 14px; }
.receipt .r span:first-child { color: var(--ink2); }
.receipt .r.tot { font-weight: 600; border-top: 1.5px solid var(--ink); margin-top: 4px; padding-top: 10px; }
.receipt .cmp { margin-top: 14px; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.receipt .cmp div { border-radius: 10px; padding: 10px 12px; font-size: 12px; color: var(--ink2); }
.receipt .cmp b { display: block; font: 500 13px/1.35 var(--f-mono); color: var(--ink); margin-top: 2px; }
.receipt .cmp .us { background: color-mix(in srgb, var(--good) 14%, transparent); }
.receipt .cmp .bk { background: var(--wash); }
.receipt .note { margin-top: 12px; font-size: 12px; color: var(--ink3); }

/* sections */
section { padding-block: 44px 8px; border-top: 1px solid var(--line); margin-top: 28px; }
section > .head { display: grid; grid-template-columns: minmax(0, 320px) minmax(0, 1fr); gap: 12px 40px; margin-bottom: 26px; }
section h2 { font-size: clamp(24px, 3vw, 32px); line-height: 1.12; font-weight: 700; }
section .sub { color: var(--ink2); max-width: 62ch; }

.pain { display: grid; gap: 0; }
.pain .row { display: grid; grid-template-columns: 200px minmax(0, 1fr) auto; gap: 8px 24px; align-items: baseline; padding: 14px 0; border-top: 1px solid var(--line); }
.pain .row:first-child { border-top: 0; }
.pain .fig { font: 500 20px/1.2 var(--f-mono); color: var(--ink); }
.pain .txt { color: var(--ink2); }
.pain .txt b { color: var(--ink); font-weight: 600; }
.grade { font: 500 11px/1 var(--f-mono); padding: 5px 8px; border-radius: 6px; background: var(--wash); color: var(--ink2); white-space: nowrap; }
.grade.a { background: color-mix(in srgb, var(--good) 16%, transparent); color: var(--good); }
.grade.b { background: var(--accent-soft); color: var(--accent); }
.grade.c { background: color-mix(in srgb, var(--warn) 16%, transparent); color: var(--warn); }
.aside { margin-top: 16px; padding: 12px 16px; background: var(--wash); border-radius: 10px; color: var(--ink2); font-size: 14px; }

.chain { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; margin-bottom: 26px; }
.chain .n { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px 12px 14px; position: relative; }
.chain .n b { display: block; font: 600 14px/1.3 var(--f-display); margin-bottom: 4px; }
.chain .n span { font-size: 12.5px; color: var(--ink2); line-height: 1.4; display: block; }
.chain .n.hot { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.chain .n:not(:last-child)::after { content: "→"; position: absolute; right: -10px; top: 50%; transform: translateY(-50%); z-index: 1; color: var(--ink3); background: var(--page); font-size: 13px; line-height: 1; padding: 2px 0; }
.principles { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 22px 28px; }
.principles h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.principles p { font-size: 14.5px; color: var(--ink2); }

.proto { background: var(--page); }
.frame { border: 1px solid var(--line); border-radius: 14px; overflow: hidden; background: var(--page); }
.frame iframe { display: block; width: 100%; height: 980px; border: 0; background: var(--page); }
.hint { margin-top: 10px; font-size: 13px; color: var(--ink3); }

table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.tw { overflow-x: auto; }
th { text-align: left; font: 500 11.5px/1.2 var(--f-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink3); padding: 8px 12px 8px 0; border-bottom: 1.5px solid var(--line); white-space: nowrap; }
td { padding: 10px 12px 10px 0; border-bottom: 1px solid var(--line); vertical-align: top; color: var(--ink2); }
td:first-child { color: var(--ink); font-weight: 500; }
td.t { color: var(--ink); font-family: var(--f-mono); font-variant-numeric: tabular-nums; font-size: 13.5px; }

.delivery { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 36px; }
.delivery h3 { font-size: 17px; font-weight: 600; margin-bottom: 10px; }
.sprints { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; counter-reset: s; }
.sprints li { counter-increment: s; display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 10px; padding: 11px 0; border-top: 1px solid var(--line); font-size: 14.5px; color: var(--ink2); }
.sprints li:first-child { border-top: 0; }
.sprints li::before { content: "S" counter(s); font: 500 12px/1.9 var(--f-mono); color: var(--accent); }
.sprints li b { color: var(--ink); font-weight: 600; display: block; }
.sla { display: grid; gap: 0; font-size: 14px; }
.sla div { display: flex; justify-content: space-between; gap: 14px; padding: 8px 0; border-top: 1px solid var(--line); color: var(--ink2); }
.sla div:first-child { border-top: 0; }
.sla b { font: 500 13px/1.5 var(--f-mono); color: var(--ink); white-space: nowrap; }
.rituals { margin-top: 16px; font-size: 14.5px; color: var(--ink2); }

.risks { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin-top: 4px; }
.risk { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; }
.risk h3 { font-size: 15.5px; font-weight: 600; margin-bottom: 6px; }
.risk p { font-size: 14px; color: var(--ink2); }
.risk .k { display: block; margin-top: 10px; font: 500 12px/1.4 var(--f-mono); color: var(--bad); }
.evid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px 28px; font-size: 14px; color: var(--ink2); }
.evid b { display: block; margin-bottom: 4px; color: var(--ink); }
footer { margin-top: 44px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 13px; color: var(--ink3); }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 28px; }
  section > .head { grid-template-columns: 1fr; }
  .pain .row { grid-template-columns: 1fr; gap: 4px; }
  .pain .row .grade { justify-self: start; margin-top: 4px; }
  .chain { grid-template-columns: 1fr; }
  .chain .n:not(:last-child)::after { content: "↓"; right: auto; left: 16px; top: auto; bottom: -13px; transform: none; }
  .delivery { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }
@media (max-width: 1000px) { .frame iframe { height: 2000px; } }