.hero {
  min-height: 93vh;
  padding: 160px 0 76px;
  display: grid;
  align-items: end;
  background: var(--white);
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  z-index: 1;
  left: 0;
  right: 0;
  top: 104px;
  height: 4px;
  background: linear-gradient(90deg, var(--blue) 0 34%, var(--green) 34% 58%, var(--yellow) 58% 78%, var(--coral) 78% 100%);
  opacity: .88;
}
.hero::after {
  content: "01";
  position: absolute;
  right: -1vw;
  bottom: -13vw;
  color: #f3f3ec;
  font-family: var(--display);
  font-size: clamp(260px, 38vw, 620px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.1em;
  pointer-events: none;
}
.hero-grid {
  position: relative; z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(260px, .55fr);
  gap: 8vw;
  align-items: end;
}
.project-id { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
.project-chip {
  display: inline-flex; align-items: center; gap: 9px;
  height: 34px; padding: 0 13px; border-radius: 13px;
  background: var(--blue-soft); color: #315fae; font-size: 12px; font-weight: 800;
}
.project-chip::before { content: ""; width: 8px; height: 8px; background: var(--blue); border-radius: 3px; }
.project-id span:last-child { color: var(--muted); font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.hero h1 {
  max-width: 850px;
  font-size: clamp(64px, 9vw, 132px);
  line-height: .88;
  letter-spacing: -.072em;
  font-weight: 780;
}
.hero h1 .accent { display: block; color: var(--blue); }
.hero-side { padding-bottom: 9px; }
.hero-lead { font-size: clamp(18px, 1.8vw, 24px); line-height: 1.42; letter-spacing: -.018em; font-weight: 560; }
.hero-note { margin-top: 20px; color: var(--muted); font-size: 14px; }
.hero-actions { display: flex; align-items: center; gap: 10px; margin-top: 32px; flex-wrap: wrap; }
.primary-button, .secondary-button {
  min-height: 50px;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 0 20px; border-radius: 17px;
  border: 1px solid transparent;
  font-weight: 760; font-size: 14px;
  transition: transform .22s ease, box-shadow .22s ease, background .22s ease;
}
.primary-button { background: var(--blue); color: var(--white); box-shadow: 0 10px 24px rgba(70,112,194,.18), inset 0 1px 0 rgba(255,255,255,.28); }
.primary-button:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(70,112,194,.24); }
.secondary-button { border-color: var(--line); background: rgba(255,255,255,.6); }
.secondary-button:hover { background: #fff; transform: translateY(-2px); }
.arrow { font-size: 18px; line-height: 1; }

.experience-band { background: var(--green-soft); border-bottom: 1px solid rgba(58,122,95,.15); scroll-margin-top: 110px; }
.experience-inner {
  min-height: 118px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 28px;
}
.experience-title { display: flex; align-items: center; gap: 22px; }
.experience-title strong { font-family: var(--display); font-size: clamp(23px, 2.6vw, 38px); letter-spacing: -.035em; line-height: 1.1; }
.status-pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 11px; border: 1px solid rgba(32,33,36,.18); border-radius: 999px;
  font-size: 12px; font-weight: 800; white-space: nowrap;
}
.status-pill::before { content: ""; width: 7px; height: 7px; background: var(--ink); border-radius: 50%; opacity: .45; }
.experience-copy { max-width: 410px; color: #426e5b; font-size: 13px; }
.experience-launch { padding-block: 24px; max-width: 440px; }
.experience-button { margin-top: 14px; min-height: 44px; }
.experience-hint { margin-top: 10px; color: #426e5b; font-size: 12px; }
.experience-title { flex-wrap: wrap; }

.summary { padding: 112px 0 126px; background: var(--paper); }
.summary-grid { display: grid; grid-template-columns: .55fr 1.45fr; gap: 10vw; }
.summary h2 { font-size: clamp(40px, 5.2vw, 76px); line-height: .98; letter-spacing: -.055em; font-weight: 690; max-width: 830px; }
.summary h2 em { font-style: normal; background: linear-gradient(transparent 64%, var(--green-soft) 64%); }
.summary-copy { margin-top: 36px; display: grid; grid-template-columns: 1fr 1fr; gap: 46px; }
.summary-copy p { color: #4f4f48; font-size: 17px; }
.summary-copy strong { color: var(--ink); }

.architecture { padding: 24px 0 102px; background: #efefe7; }
.architecture-head {
  width: min(calc(100% - 48px), var(--max)); margin: 0 auto 26px;
  display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: end;
}
.architecture-head h2 { margin-top: 10px; font-size: clamp(42px, 6.2vw, 82px); line-height: .95; letter-spacing: -.06em; }
.architecture-head p { max-width: 420px; color: var(--muted); font-size: 14px; margin-top: 18px; }
.architecture-frame {
  width: min(calc(100% - 32px), 1520px);
  margin-inline: auto;
  padding: 10px;
  border-radius: 30px;
  position: relative;
}
.architecture-frame {
  border: 1px solid rgba(32,33,36,.12);
  background: rgba(255,255,255,.72);
  box-shadow: 0 26px 70px rgba(45,54,52,.12), 0 1px 0 rgba(255,255,255,.9) inset;
}
.frame-bar {
  height: 50px;
  padding: 0 12px 0 16px;
  display: flex; align-items: center; gap: 10px;
  border-bottom: 1px solid var(--line);
}
.frame-mark { width: 24px; height: 3px; border-radius: 3px; background: linear-gradient(90deg, var(--blue) 0 25%, var(--green) 25% 50%, var(--yellow) 50% 75%, var(--coral) 75%); }
.frame-label { color: var(--muted); font-size: 12px; font-weight: 690; }
.frame-state { margin-left: auto; color: var(--muted); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.architecture-canvas {
  height: min(74vh, 820px);
  min-height: 620px;
  border-radius: 0 0 21px 21px;
  overflow: hidden;
  background: #fff;
  position: relative;
}
.architecture-canvas iframe { display: block; width: 100%; height: 100%; border: 0; background: transparent; position: relative; z-index: 2; }
.mode-note {
  position: fixed; z-index: 80; left: 24px; bottom: 24px;
  max-width: 360px; padding: 13px 15px;
  border: 1px solid rgba(255,255,255,.8); border-radius: 15px;
  background: rgba(255,255,255,.82); backdrop-filter: blur(18px);
  box-shadow: 0 8px 24px rgba(20,20,16,.1);
  font-size: 12px; color: #45453f;
  pointer-events: none; opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity .2s ease, transform .24s ease, visibility 0s linear .24s;
}
.mode-note.is-visible { opacity: 1; visibility: visible; transform: translateY(0); transition-delay: 0s; }
.mode-note strong { display: block; color: var(--ink); font-size: 13px; margin-bottom: 2px; }

.process { padding: 132px 0; background: var(--white); }
.section-head { display: grid; grid-template-columns: .55fr 1.45fr; gap: 10vw; margin-bottom: 68px; }
.section-head h2 { font-size: clamp(42px, 5.5vw, 76px); line-height: .97; letter-spacing: -.055em; }
.steps { border-top: 1px solid var(--ink); }
.step {
  display: grid; grid-template-columns: 90px minmax(200px,.65fr) 1.35fr;
  gap: 26px; align-items: baseline;
  padding: 33px 0; border-bottom: 1px solid var(--line);
}
.step-index { font-size: 13px; color: var(--blue); font-weight: 800; }
.step:nth-child(2) .step-index { color: var(--green); }
.step:nth-child(3) .step-index { color: #9b7215; }
.step:nth-child(4) .step-index { color: var(--coral); }
.step h3 { font-size: clamp(21px, 2.2vw, 30px); letter-spacing: -.03em; }
.step p { max-width: 650px; color: var(--muted); }

.decisions { padding: 122px 0; background: var(--ink); color: #f7f7f2; }
.decisions .eyebrow { color: #a9a99f; }
.decision-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 8vw; margin-bottom: 74px; }
.decision-intro h2 { font-size: clamp(44px, 6vw, 82px); line-height: .95; letter-spacing: -.06em; }
.decision-intro p { align-self: end; max-width: 520px; color: #b8b8ad; font-size: 17px; }
.decision-list { border-top: 1px solid rgba(255,255,255,.25); }
.decision {
  display: grid; grid-template-columns: 70px .7fr 1.3fr;
  gap: 30px; padding: 35px 0;
  border-bottom: 1px solid rgba(255,255,255,.14);
}
.decision > span { color: var(--coral); font-size: 12px; font-weight: 800; letter-spacing: .08em; }
.decision h3 { font-size: 22px; letter-spacing: -.025em; }
.decision p { color: #aaa9a0; max-width: 620px; }

.evidence { padding: 120px 0; background: var(--paper); }
.evidence-grid { display: grid; grid-template-columns: .72fr 1.28fr; gap: 8vw; }
.evidence h2 { margin-top: 12px; font-size: clamp(40px, 5.2vw, 70px); line-height: .98; letter-spacing: -.055em; }
.evidence-note { color: var(--muted); margin-top: 22px; max-width: 420px; }
.evidence-placeholder {
  min-height: 410px;
  display: grid; place-items: center;
  border: 1px dashed #a5a598;
  background: repeating-linear-gradient(-45deg, transparent, transparent 9px, rgba(20,20,16,.018) 9px, rgba(20,20,16,.018) 10px);
  text-align: center; padding: 40px;
}
.placeholder-label { font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: #85857a; }
.evidence-placeholder strong { display: block; margin-top: 12px; font-family: var(--display); font-size: 25px; letter-spacing: -.03em; }
.evidence-placeholder p { max-width: 430px; margin: 10px auto 0; color: var(--muted); font-size: 14px; }

.notes { padding: 122px 0; background: var(--white); }
.notes-grid { display: grid; grid-template-columns: .58fr 1.42fr; gap: 10vw; }
.notes h2 { margin-top: 12px; font-size: clamp(42px, 5.4vw, 74px); line-height: .98; letter-spacing: -.055em; }
.note-list { border-top: 1px solid var(--ink); }
.note-row { display: grid; grid-template-columns: 112px 1fr; gap: 26px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.note-row time { color: #8a8a80; font-size: 12px; font-weight: 700; }
.note-row h3 { font-size: 20px; letter-spacing: -.02em; }
.note-row p { color: var(--muted); margin-top: 6px; font-size: 14px; }

.next { background: var(--coral-soft); padding: 98px 0 38px; }
.next-link { display: block; }
.next-top { display: flex; justify-content: space-between; align-items: center; gap: 30px; }
.next-label { font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.next-arrow { font-size: 38px; transition: transform .25s ease; }
.next-link:hover .next-arrow { transform: translateX(8px); }
.next h2 { margin-top: 44px; font-size: clamp(58px, 10vw, 145px); line-height: .82; letter-spacing: -.075em; }
.next-meta { margin-top: 35px; padding-top: 20px; border-top: 1px solid rgba(32,33,36,.18); display: flex; justify-content: space-between; gap: 20px; color: #7b4d49; font-size: 13px; }
footer { background: var(--white); padding: 34px 0; }
.footer-inner { display: flex; justify-content: space-between; gap: 28px; font-size: 12px; font-weight: 680; }

[data-copy] { transition: opacity .12s ease; }
body.switching [data-copy] { opacity: .15; }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .hero { min-height: auto; padding-top: 148px; }
  .hero-grid, .summary-grid, .section-head, .decision-intro, .evidence-grid, .notes-grid { grid-template-columns: 1fr; gap: 42px; }
  .hero h1 { font-size: clamp(62px, 17vw, 110px); }
  .hero-side { max-width: 580px; }
  .summary-copy { gap: 28px; }
  .architecture-head { align-items: start; }
  .architecture-canvas { min-height: 560px; height: 68vh; }
  .step { grid-template-columns: 56px minmax(170px,.65fr) 1.35fr; }
  .decision { grid-template-columns: 54px .7fr 1.3fr; }
}

@media (max-width: 640px) {
  .shell { width: min(calc(100% - 32px), var(--max)); }
  .nav { width: calc(100% - 20px); min-height: 58px; border-radius: 19px; padding-left: 12px; }
  .nav-cta { display: none; }
  .hero { padding: 130px 0 58px; }
  .hero::after { bottom: -4vw; right: -6vw; font-size: 240px; }
  .project-id { align-items: flex-start; flex-direction: column; gap: 8px; }
  .hero h1 { font-size: clamp(55px, 19vw, 88px); }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .primary-button, .secondary-button { width: 100%; }
  .experience-inner { min-height: 148px; grid-template-columns: 1fr; gap: 10px; padding-block: 26px; }
  .experience-title { align-items: flex-start; flex-direction: column; gap: 12px; }
  .summary, .process, .decisions, .evidence, .notes { padding-block: 88px; }
  .summary-copy { grid-template-columns: 1fr; }
  .architecture { padding-top: 64px; }
  .architecture-head { width: calc(100% - 32px); grid-template-columns: 1fr; }
      .architecture-frame { width: calc(100% - 16px); padding: 6px; border-radius: 22px; }
  .architecture-canvas { min-height: 520px; height: 72vh; border-radius: 0 0 16px 16px; }
  .frame-state { display: none; }
  .mode-note { left: 12px; right: 12px; bottom: 12px; max-width: none; }
  .step, .decision { grid-template-columns: 42px 1fr; gap: 16px; }
  .step p, .decision p { grid-column: 2; }
  .note-row { grid-template-columns: 1fr; gap: 8px; }
  .next { padding-top: 76px; }
  .next h2 { margin-top: 58px; }
  .next-meta, .footer-inner { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

.hero-return { position: absolute; z-index: 2; top: 118px; left: max(24px, calc((100% - var(--max)) / 2)); }
.architecture-preview { display: block; position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; }
.architecture-canvas iframe[hidden] { display: none; }
.architecture-support { display: flex; justify-content: space-between; gap: 12px 24px; flex-wrap: wrap; padding: 14px 16px 6px; font-size: 12px; color: var(--muted); }
.architecture-support a { color: #315fae; text-decoration: underline; text-underline-offset: 3px; min-height: 28px; }
[data-architecture-state="ready"] .architecture-status { color: #426e5b; }
@media (max-width: 640px) {
  .hero { padding-top: 168px; }
  .hero-return { top: 115px; left: 16px; }
}