:root {
  --paper: #e8f1f4;
  --paper-deep: #d9e6eb;
  --white: #f8fbfc;
  --ink: #1b2b33;
  --muted: #5e717a;
  --line: #b4c7ce;
  --line-strong: #7895a0;
  --signal: #a6335d;
  --signal-dark: #7f2747;
  --violet: #5c54a8;
  --moss: #54705f;
  --amber: #b77620;
  --shadow: 0 20px 60px rgba(24, 47, 59, .11);
  --radius: 18px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
  overflow-x: hidden;
}

a { color: inherit; }

:focus-visible {
  outline: 3px solid var(--violet);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-160%);
}

.skip-link:focus { transform: translateY(0); }

.topbar {
  display: flex;
  align-items: center;
  gap: 28px;
  max-width: 1240px;
  margin: 0 auto;
  padding: 20px 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: -.03em;
  text-decoration: none;
}

.brand img { border-radius: 9px; }

nav { display: flex; gap: 22px; margin-left: auto; }

nav a {
  color: var(--muted);
  font-size: .78rem;
  font-weight: 750;
  letter-spacing: .08em;
  text-decoration: none;
  text-transform: uppercase;
}

nav a:hover { color: var(--ink); }

.topbar__action,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 17px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: .84rem;
  font-weight: 800;
  text-decoration: none;
  transition: transform .2s ease, background-color .2s ease, color .2s ease, border-color .2s ease;
}

.topbar__action,
.button--signal { color: var(--white); background: var(--signal); }

.topbar__action:hover,
.button--signal:hover { background: var(--signal-dark); transform: translateY(-2px); }

.button--quiet { color: var(--ink); background: transparent; border-color: var(--line-strong); }
.button--quiet:hover { color: var(--violet); border-color: var(--violet); transform: translateY(-2px); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(440px, 1.08fr);
  gap: clamp(44px, 7vw, 110px);
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(54px, 9vw, 112px) 28px 76px;
}

.hero__copy { align-self: center; max-width: 650px; }

.eyebrow,
.section-label,
.product-name {
  margin: 0 0 14px;
  color: var(--signal);
  font-size: .73rem;
  font-weight: 850;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.product-name { color: var(--violet); }

h1,
h2,
h3,
p { margin-top: 0; }

h1,
h2 {
  max-width: 700px;
  margin-bottom: 22px;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 500;
  letter-spacing: -.055em;
  line-height: 1.02;
}

h1 { font-size: clamp(3.35rem, 6.7vw, 6.8rem); }
h2 { font-size: clamp(2.35rem, 4vw, 4.7rem); }
h3 { font-size: 1.12rem; line-height: 1.2; }

.hero__lede {
  max-width: 610px;
  margin-bottom: 28px;
  color: #36505b;
  font-size: clamp(1.06rem, 1.45vw, 1.28rem);
}

.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 22px; }

.ownership-note {
  max-width: 590px;
  margin: 0;
  color: var(--muted);
  font-size: .83rem;
}

.hero__board {
  position: relative;
  align-self: center;
  min-height: 440px;
  padding: 22px;
  border: 1px solid var(--line-strong);
  border-radius: 22px;
  background:
    linear-gradient(rgba(92, 84, 168, .08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(92, 84, 168, .08) 1px, transparent 1px),
    var(--white);
  background-size: 28px 28px;
  box-shadow: var(--shadow);
  transform: rotate(1.2deg);
}

.hero__board::after {
  position: absolute;
  inset: 14px;
  z-index: 0;
  border: 1px solid rgba(120, 149, 160, .4);
  border-radius: 14px;
  content: "";
  pointer-events: none;
}

.board__topline,
.board__footer {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: .68rem;
  font-weight: 850;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.board__body { position: relative; z-index: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 34px 0 42px; }

.lane { padding: 16px; border: 1px solid var(--line); border-radius: 14px; background: rgba(248, 251, 252, .78); }
.lane--prepare { background: rgba(236, 231, 251, .58); border-color: rgba(92, 84, 168, .32); }

.lane__label { display: grid; gap: 2px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.lane__label strong { color: var(--violet); font-size: .8rem; letter-spacing: .14em; }
.lane__label span { color: var(--muted); font-size: .72rem; }

.lane__item { display: grid; grid-template-columns: 24px 1fr; gap: 6px 9px; padding: 14px 0; border-bottom: 1px dashed var(--line); }
.lane__item:last-child { border-bottom: 0; }
.lane__item span { grid-row: span 2; color: var(--line-strong); font: 700 .76rem/1 Georgia, serif; }
.lane__item b { font-size: .8rem; }
.lane__item em { color: var(--muted); font-size: .66rem; font-style: normal; }
.lane__item--done b { color: var(--moss); }
.lane__item--mark { margin: 0 -8px; padding: 14px 8px; background: rgba(166, 51, 93, .1); border-left: 3px solid var(--signal); }
.lane__item--mark b { color: var(--signal-dark); }
.lane__item--quiet { opacity: .62; }

.board__footer { align-items: center; justify-content: flex-start; color: var(--signal-dark); text-transform: none; letter-spacing: .01em; }
.revision-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 0 5px rgba(166, 51, 93, .12); }

.proof-rail { display: grid; grid-template-columns: repeat(4, 1fr); max-width: 1184px; margin: 0 auto; padding: 0 28px 92px; }
.proof-rail > div { display: grid; gap: 4px; padding: 18px 20px; border-left: 1px solid var(--line-strong); }
.proof-rail strong { color: var(--violet); font: 500 clamp(1.7rem, 3vw, 2.6rem)/1 Georgia, serif; }
.proof-rail span { color: var(--muted); font-size: .76rem; font-weight: 750; letter-spacing: .05em; text-transform: uppercase; }

.section-shell { max-width: 1184px; margin: 0 auto 92px; padding: 0 28px; opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.section-shell.is-visible { opacity: 1; transform: none; }
.section-heading { max-width: 810px; margin-bottom: 32px; }
.section-heading--split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, .55fr); gap: 40px; align-items: end; }
.section-heading--split > p { margin: 0; color: var(--muted); font-size: .95rem; }

.replay-tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 12px; }
.replay-tab { min-height: 82px; padding: 13px 14px; color: var(--muted); background: rgba(248, 251, 252, .55); border: 1px solid var(--line); border-radius: 12px; text-align: left; cursor: pointer; }
.replay-tab span, .replay-tab small { display: block; }
.replay-tab span { color: var(--ink); font-size: .84rem; font-weight: 800; }
.replay-tab small { margin-top: 7px; font-size: .7rem; }
.replay-tab:hover { border-color: var(--violet); }
.replay-tab.is-active { color: var(--white); background: var(--violet); border-color: var(--violet); }
.replay-tab.is-active span { color: var(--white); }

.replay-workspace { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr); min-height: 360px; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--white); box-shadow: 0 12px 40px rgba(24, 47, 59, .08); overflow: hidden; }
.replay-main { padding: clamp(22px, 4vw, 42px); }
.replay-meta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; margin-bottom: 26px; color: var(--muted); font: 700 .7rem/1.2 ui-monospace, SFMono-Regular, Menlo, monospace; }
.replay-status { margin-bottom: 13px; color: var(--signal-dark); font-size: .79rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.replay-main h3 { max-width: 620px; margin-bottom: 13px; font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.65rem, 3vw, 2.65rem); font-weight: 500; letter-spacing: -.04em; }
.replay-main > p:not(.replay-status):not(.replay-meta) { max-width: 650px; color: #46606b; }
.evidence-list { display: grid; gap: 0; margin: 30px 0 0; }
.evidence-list div { display: grid; grid-template-columns: minmax(130px, 1fr) auto auto; gap: 18px; align-items: center; padding: 11px 0; border-top: 1px solid var(--line); }
.evidence-list dt, .evidence-list dd { margin: 0; font-size: .77rem; }
.evidence-list dt { color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.evidence-list dd { font-weight: 800; }
.evidence-list code { color: var(--violet); font-size: .67rem; font-weight: 800; }

.receipt { padding: 30px; background: #e2e4f4; border-left: 1px solid rgba(92, 84, 168, .28); }
.receipt h3 { margin-bottom: 20px; font-family: Georgia, "Times New Roman", serif; font-size: 1.55rem; font-weight: 500; letter-spacing: -.04em; }
.receipt__decision { display: inline-flex; min-width: 116px; min-height: 58px; align-items: center; justify-content: center; margin-bottom: 20px; padding: 10px 16px; color: var(--white); background: var(--signal); border-radius: 10px; font: 700 1.1rem/1 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .08em; }
.receipt > p:not(.section-label) { color: #425765; font-size: .86rem; }
.receipt dl { display: grid; gap: 13px; margin: 28px 0 0; }
.receipt dl div { display: flex; justify-content: space-between; gap: 16px; padding-top: 11px; border-top: 1px solid rgba(92, 84, 168, .28); }
.receipt dt, .receipt dd { margin: 0; font-size: .73rem; }
.receipt dt { color: var(--muted); }
.receipt dd { font-weight: 800; text-align: right; }

.section-shell--paper { padding-top: 44px; padding-bottom: 44px; background: rgba(248, 251, 252, .62); border: 1px solid var(--line); border-radius: var(--radius); }
.packet-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 42px; margin: 0; padding: 0; list-style: none; }
.packet-list li { display: grid; grid-template-columns: 38px 1fr; gap: 16px; padding: 22px 0; border-top: 1px solid var(--line); }
.packet-list > li > span { color: var(--signal); font: 500 1.6rem/1 Georgia, serif; }
.packet-list strong { display: block; margin-bottom: 5px; font-size: .96rem; }
.packet-list p { margin: 0; color: var(--muted); font-size: .84rem; }
.packet-note { display: flex; justify-content: space-between; gap: 18px; margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line-strong); color: var(--muted); font-size: .8rem; }
.packet-note strong { color: var(--signal-dark); }

.boundary-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 42px; }
.boundary-columns > div { padding-top: 18px; border-top: 2px solid var(--violet); }
.boundary-columns > div:last-child { border-top-color: var(--signal); }
.boundary-columns h3 { margin-bottom: 16px; }
.boundary-columns ul { display: grid; gap: 11px; margin: 0; padding-left: 18px; color: var(--muted); font-size: .87rem; }

.fit { margin-bottom: 72px; }
.fit__inner { max-width: 800px; padding: clamp(30px, 6vw, 64px); border-radius: var(--radius); background: var(--ink); color: var(--white); box-shadow: var(--shadow); }
.fit__inner .section-label { color: #dba0ba; }
.fit__inner h2 { margin-bottom: 18px; }
.fit__inner > p:not(.section-label):not(.fit__note) { max-width: 620px; color: #c8d4d8; }
.fit__note { margin: 20px 0 0; color: #9cb1b9; font-size: .76rem; }

.footer { display: flex; justify-content: space-between; gap: 20px; max-width: 1184px; margin: 0 auto; padding: 0 28px 38px; color: var(--muted); font-size: .78rem; }
.footer p { margin: 8px 0 0; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 42px; }
  .hero__board { max-width: 700px; }
  .section-heading--split { grid-template-columns: 1fr; gap: 14px; }
}

@media (max-width: 650px) {
  .topbar { flex-wrap: wrap; padding: 16px 18px; }
  nav { order: 3; width: 100%; justify-content: space-between; margin-left: 0; }
  .topbar__action { margin-left: auto; }
  .hero { padding: 50px 18px 58px; }
  h1 { font-size: clamp(3rem, 16vw, 4.7rem); }
  h2 { font-size: clamp(2.25rem, 12vw, 3.6rem); }
  .hero__board { min-height: 0; padding: 16px; transform: none; }
  .board__body { gap: 8px; margin: 28px 0 30px; }
  .lane { padding: 11px; }
  .lane__item { padding: 11px 0; }
  .lane__item--mark { margin: 0 -5px; padding: 11px 5px; }
  .board__topline, .board__footer { font-size: .56rem; }
  .proof-rail { grid-template-columns: repeat(2, 1fr); padding: 0 18px 72px; }
  .proof-rail > div { padding: 15px 12px; }
  .section-shell { padding: 0 18px; margin-bottom: 72px; }
  .replay-tabs { grid-template-columns: 1fr 1fr; }
  .replay-tab { min-height: 76px; padding: 11px; }
  .replay-workspace { grid-template-columns: 1fr; }
  .receipt { border-top: 1px solid rgba(92, 84, 168, .28); border-left: 0; }
  .section-shell--paper { padding: 28px 18px; }
  .packet-list, .boundary-columns { grid-template-columns: 1fr; gap: 0; }
  .packet-note, .footer { flex-direction: column; }
  .footer { padding: 0 18px 30px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .section-shell { opacity: 1; transform: none; }
}