:root {
  color-scheme: light;
  --ink: #0b1f33;
  --ink-soft: #18354f;
  --paper: #f7f4ed;
  --paper-deep: #eee9df;
  --white: #fffdfa;
  --line: #d7d4cc;
  --muted: #66717b;
  --muted-dark: #9eacb7;
  --accent: #ff6b35;
  --accent-soft: #fff0e9;
  --blue: #2b73a8;
  --blue-soft: #eaf4fb;
  --green: #2c8063;
  --green-soft: #e7f4ed;
  --violet: #7155a3;
  --violet-soft: #f1edf8;
  --shadow: 0 22px 60px rgba(11, 31, 51, 0.09);
  --radius: 18px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
}

button {
  color: inherit;
}

.page-shell {
  width: min(100% - 48px, 1240px);
  margin-inline: auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
  transform: translateY(-160%);
  transition: transform 160ms ease;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid rgba(11, 31, 51, 0.12);
  background: rgba(247, 244, 237, 0.9);
  backdrop-filter: blur(18px);
}

.topbar__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: min(100% - 48px, 1240px);
  min-height: 72px;
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  width: max-content;
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 850;
  letter-spacing: -0.035em;
  text-decoration: none;
}

.brand__mark {
  display: grid;
  grid-template-columns: repeat(2, 8px);
  gap: 3px;
  width: 24px;
  height: 24px;
  padding: 2px;
}

.brand__mark i {
  display: block;
  border-radius: 2px;
  background: var(--ink);
}

.brand__mark i:first-child,
.brand__mark i:last-child {
  background: var(--accent);
}

.topnav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.topnav a {
  color: #465664;
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}

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

.topbar .button {
  justify-self: end;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 800;
  font-size: 0.84rem;
  text-decoration: none;
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease, color 140ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(1px);
}

.button--compact {
  min-height: 38px;
  padding-inline: 14px;
  border-radius: 8px;
  font-size: 0.75rem;
}

.button--ink {
  background: var(--ink);
  color: #fff;
}

.button--ink:hover {
  background: #16344e;
}

.button--accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 12px 28px rgba(255, 107, 53, 0.22);
}

.button--accent:hover {
  background: #ee5824;
}

.button--outline {
  min-height: 40px;
  padding-inline: 14px;
  border-color: #cad0d5;
  background: transparent;
  color: #4b5c6a;
  font-size: 0.75rem;
}

.button--outline:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.button:focus-visible,
.text-link:focus-visible,
.topnav a:focus-visible,
.filter-chip:focus-visible,
.scenario-card:focus-visible,
.text-button:focus-visible,
input:focus-visible,
footer a:focus-visible {
  outline: 3px solid rgba(255, 107, 53, 0.38);
  outline-offset: 3px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(420px, 0.92fr);
  align-items: center;
  gap: 76px;
  min-height: 680px;
  padding-top: 70px;
  padding-bottom: 76px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 24px;
  color: var(--blue);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.eyebrow span {
  width: 24px;
  height: 2px;
  background: var(--accent);
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3.5rem, 6.5vw, 6.3rem);
  font-weight: 500;
  letter-spacing: -0.065em;
  line-height: 0.94;
}

.hero__lede {
  max-width: 650px;
  margin: 28px 0 0;
  color: #53616c;
  font-size: 1.04rem;
  line-height: 1.72;
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-top: 34px;
}

.text-link {
  font-size: 0.85rem;
  font-weight: 800;
  text-underline-offset: 5px;
  text-decoration-color: #a8b0b6;
}

.text-link:hover {
  text-decoration-color: var(--accent);
}

.hero__stats {
  display: flex;
  gap: 0;
  margin: 46px 0 0;
}

.hero__stats div {
  min-width: 132px;
  padding-right: 28px;
  margin-right: 28px;
  border-right: 1px solid var(--line);
}

.hero__stats div:last-child {
  border-right: 0;
}

.hero__stats dt {
  margin-bottom: 4px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  letter-spacing: -0.04em;
}

.hero__stats dd {
  margin: 0;
  color: #78818a;
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero__visual {
  position: relative;
  isolation: isolate;
  min-height: 510px;
  padding: 34px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 26px;
  background: var(--ink);
  color: #f8fbfd;
  box-shadow: 0 35px 90px rgba(11, 31, 51, 0.25);
}

.hero__visual::after {
  position: absolute;
  right: -90px;
  bottom: -120px;
  z-index: -1;
  width: 330px;
  height: 330px;
  border: 80px solid rgba(255, 107, 53, 0.08);
  border-radius: 50%;
  content: "";
}

.blueprint-grid {
  position: absolute;
  inset: 0;
  z-index: -2;
  opacity: 0.22;
  background-image: linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(to bottom, #000, transparent 85%);
}

.visual__label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #b7c8d5;
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.pulse-dot,
.live-badge i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #5ce0a8;
  box-shadow: 0 0 0 4px rgba(92, 224, 168, 0.12);
}

.visual__flow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 28px 0 22px;
  color: #587087;
  font-size: 0.76rem;
}

.mini-node {
  flex: 1;
  padding: 12px 8px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  color: #c2d0da;
  font-size: 0.68rem;
  font-weight: 750;
  text-align: center;
}

.mini-node--hot {
  border-color: rgba(255, 107, 53, 0.5);
  background: rgba(255, 107, 53, 0.12);
  color: #ffd0be;
}

.visual__metric,
.visual__split,
.visual__note {
  border: 1px solid rgba(255, 255, 255, 0.11);
  background: rgba(7, 24, 40, 0.72);
}

.visual__metric {
  padding: 22px;
  border-radius: 14px;
}

.visual__metric > span,
.visual__split span {
  display: block;
  color: #8ea3b2;
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.visual__metric strong {
  display: block;
  margin-top: 8px;
  color: #fff;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 3.4rem;
  font-weight: 500;
  letter-spacing: -0.055em;
}

.visual__metric strong small {
  color: #8da3b5;
  font-family: Inter, sans-serif;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0;
}

.spark-bars {
  display: flex;
  align-items: end;
  gap: 5px;
  height: 42px;
  margin-top: -34px;
  margin-left: 66%;
}

.spark-bars i {
  flex: 1;
  border-radius: 2px 2px 0 0;
  background: var(--accent);
  opacity: 0.72;
}

.spark-bars i:nth-child(1) { height: 25%; }
.spark-bars i:nth-child(2) { height: 42%; }
.spark-bars i:nth-child(3) { height: 38%; }
.spark-bars i:nth-child(4) { height: 67%; }
.spark-bars i:nth-child(5) { height: 58%; }
.spark-bars i:nth-child(6) { height: 88%; }
.spark-bars i:nth-child(7) { height: 72%; }
.spark-bars i:nth-child(8) { height: 100%; }

.visual__split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-top: 10px;
  border-radius: 12px;
}

.visual__split div {
  padding: 16px 18px;
}

.visual__split div + div {
  border-left: 1px solid rgba(255, 255, 255, 0.11);
}

.visual__split strong {
  display: block;
  margin-top: 6px;
  font-size: 1.18rem;
}

.visual__formula {
  margin: 18px 0;
  color: #7fa6c2;
  font-size: 0.78rem;
  text-align: center;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.visual__note {
  padding: 14px 16px;
  border-radius: 10px;
  color: #b9c8d3;
  font-size: 0.73rem;
  line-height: 1.5;
}

.visual__note span {
  display: block;
  margin-bottom: 3px;
  color: #ff9b75;
  font-size: 0.6rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.signal-strip {
  border-top: 1px solid #d6d3cc;
  border-bottom: 1px solid #d6d3cc;
  background: #f1ede5;
}

.signal-strip__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 58px;
  color: #68737b;
  font-size: 0.67rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.signal-strip i {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #a2aaa9;
}

.lab-section,
.field-guide {
  padding-top: 108px;
  padding-bottom: 118px;
}

.section-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
  color: #68737c;
  font-size: 0.69rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-kicker span {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid #bcc3c5;
  border-radius: 50%;
  color: var(--accent);
  font-size: 0.65rem;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 48px;
  margin-bottom: 42px;
}

.section-heading h2,
.method-intro h2 {
  max-width: 780px;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.4rem, 5vw, 4.5rem);
  font-weight: 500;
  letter-spacing: -0.055em;
  line-height: 1;
}

.section-heading > div > p {
  max-width: 650px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

.precision-note {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 300px;
  padding: 13px 15px;
  border: 1px solid #d4d0c7;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.3);
}

.precision-note > span {
  display: grid;
  place-items: center;
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: Georgia, serif;
  font-size: 1.35rem;
}

.precision-note p {
  margin: 0;
  color: #7a8288;
  font-size: 0.65rem;
  line-height: 1.5;
}

.precision-note strong {
  display: block;
  color: var(--ink);
  font-size: 0.67rem;
}

.lab-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
}

.scenario-search {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 278px;
  height: 44px;
  padding: 0 12px;
  border: 1px solid #d2d0ca;
  border-radius: 10px;
  background: var(--white);
  color: #8b949b;
}

.scenario-search input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-size: 0.78rem;
}

.scenario-search input::placeholder {
  color: #9ca4a9;
}

kbd {
  padding: 2px 6px;
  border: 1px solid #d6d3cb;
  border-bottom-width: 2px;
  border-radius: 4px;
  color: #899198;
  font: 0.62rem "SFMono-Regular", Consolas, monospace;
}

.category-filters {
  display: flex;
  gap: 7px;
  padding-bottom: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}

.category-filters::-webkit-scrollbar {
  display: none;
}

.filter-chip {
  flex: 0 0 auto;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid #d1cfc9;
  border-radius: 999px;
  background: transparent;
  color: #727c83;
  cursor: pointer;
  font-size: 0.66rem;
  font-weight: 750;
}

.filter-chip:hover,
.filter-chip.is-active {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
}

.lab-layout {
  display: grid;
  grid-template-columns: 278px minmax(0, 1fr);
  align-items: start;
  border: 1px solid #d0cec8;
  border-radius: 22px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.scenario-library {
  position: sticky;
  top: 88px;
  padding: 22px 16px;
  border-right: 1px solid #dedbd4;
}

.library__heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 6px 14px;
}

.library__heading h3 {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.library__heading span {
  color: #939ba0;
  font-size: 0.65rem;
}

.scenario-list {
  display: grid;
  gap: 5px;
}

.scenario-card {
  display: grid;
  grid-template-columns: 38px 1fr 20px;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 58px;
  padding: 7px 9px;
  border: 1px solid transparent;
  border-radius: 11px;
  background: transparent;
  cursor: pointer;
  text-align: left;
}

.scenario-card:hover {
  background: #f5f2eb;
}

.scenario-card.is-active {
  border-color: #f5c9b7;
  background: var(--accent-soft);
}

.scenario-card__icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid #d9d8d3;
  border-radius: 9px;
  background: #fff;
  color: var(--blue);
  font-family: Georgia, serif;
  font-size: 1rem;
  font-weight: 750;
}

.scenario-card.is-active .scenario-card__icon {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.scenario-card__copy {
  min-width: 0;
}

.scenario-card__copy strong,
.scenario-card__copy small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.scenario-card__copy strong {
  font-size: 0.73rem;
}

.scenario-card__copy small {
  margin-top: 3px;
  color: #879098;
  font-size: 0.58rem;
}

.scenario-card__arrow {
  color: #a0a7ac;
  opacity: 0;
  transform: translateX(-5px);
  transition: opacity 140ms ease, transform 140ms ease;
}

.scenario-card:hover .scenario-card__arrow,
.scenario-card.is-active .scenario-card__arrow {
  opacity: 1;
  transform: translateX(0);
}

.library__tip {
  display: flex;
  gap: 9px;
  margin: 20px 4px 0;
  padding: 13px;
  border-top: 1px solid #e1ded8;
  background: #f7f5ef;
}

.library__tip > span {
  display: grid;
  place-items: center;
  flex: 0 0 22px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 0.68rem;
  font-weight: 900;
}

.library__tip p,
.library-empty p {
  margin: 0;
  color: #7b858c;
  font-size: 0.63rem;
  line-height: 1.5;
}

.library__tip strong {
  color: #455766;
}

.library-empty {
  padding: 28px 12px;
  text-align: center;
}

.library-empty strong {
  display: block;
  margin-bottom: 6px;
  font-size: 0.75rem;
}

.scenario-stage {
  min-width: 0;
}

.scenario-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 32px;
  padding: 38px 40px 32px;
  border-bottom: 1px solid #e0ded8;
}

.scenario-meta {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 14px;
  color: var(--blue);
  font-size: 0.61rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.scenario-meta i {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #aeb5b9;
}

.scenario-header h3 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2.45rem;
  font-weight: 500;
  letter-spacing: -0.045em;
}

.scenario-prompt {
  margin: 10px 0 0;
  color: #2b4154;
  font-size: 0.9rem;
  font-weight: 800;
}

.scenario-description {
  max-width: 690px;
  margin: 10px 0 0;
  color: #778188;
  font-size: 0.76rem;
  line-height: 1.65;
}

.estimation-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 16px;
  padding: 22px;
  background: #f1eee7;
}

.panel {
  min-width: 0;
  padding: 20px;
  border: 1px solid #dad8d2;
  border-radius: 15px;
  background: var(--white);
}

.results-panel {
  background: var(--ink);
  color: #fff;
}

.panel__heading,
.panel__heading > div,
.block-heading,
.block-heading > div {
  display: flex;
  align-items: center;
}

.panel__heading {
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid #e2e0da;
}

.results-panel .panel__heading {
  border-color: rgba(255, 255, 255, 0.12);
}

.panel__heading > div,
.block-heading > div {
  gap: 11px;
}

.panel__step {
  display: grid;
  place-items: center;
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
  border: 1px solid #c7cbd0;
  border-radius: 50%;
  color: var(--accent);
  font: 700 0.66rem "SFMono-Regular", Consolas, monospace;
}

.panel__step--dark {
  border-color: rgba(255, 255, 255, 0.22);
}

.panel__heading h4 {
  margin: 0;
  font-size: 0.8rem;
}

.panel__heading p {
  margin: 3px 0 0;
  color: #8c959b;
  font-size: 0.61rem;
}

.results-panel .panel__heading p {
  color: #8ea1b0;
}

.live-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  color: #628473;
  font-size: 0.58rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.live-badge i {
  width: 6px;
  height: 6px;
  box-shadow: 0 0 0 3px rgba(92, 224, 168, 0.12);
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin-top: 14px;
}

.input-card {
  display: block;
  min-width: 0;
  padding: 11px 12px 10px;
  border: 1px solid #e0ded8;
  border-radius: 10px;
  background: #fbfaf6;
  transition: border-color 140ms ease, box-shadow 140ms ease;
}

.input-card:focus-within {
  border-color: #ef9b79;
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.08);
}

.input-card__heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.input-card__label {
  overflow: hidden;
  color: #445461;
  font-size: 0.61rem;
  font-weight: 800;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.input-card__unit {
  flex: 0 0 auto;
  color: #9a7264;
  font-size: 0.55rem;
  font-weight: 750;
}

.input-card__control {
  display: block;
  margin-top: 6px;
}

.input-card input {
  width: 100%;
  padding: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.45rem;
  font-weight: 500;
  letter-spacing: -0.035em;
  appearance: textfield;
}

.input-card input::-webkit-outer-spin-button,
.input-card input::-webkit-inner-spin-button {
  margin: 0;
  appearance: none;
}

.input-card__help {
  display: block;
  min-height: 20px;
  margin-top: 4px;
  color: #989fa3;
  font-size: 0.52rem;
  line-height: 1.35;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin-top: 14px;
}

.metric {
  min-height: 112px;
  padding: 13px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.045);
}

.metric__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  color: #a9bac7;
  font-size: 0.57rem;
  font-weight: 750;
}

.metric__top i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.metric--orange .metric__top { color: #ff9a74; }
.metric--blue .metric__top { color: #7fc3f1; }
.metric--green .metric__top { color: #6fdbad; }
.metric--violet .metric__top { color: #c0a9e8; }

.metric__value {
  display: block;
  margin-top: 12px;
  overflow: hidden;
  color: #fff;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.35rem, 2.2vw, 1.9rem);
  font-weight: 500;
  letter-spacing: -0.045em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.metric__note {
  margin: 6px 0 0;
  overflow: hidden;
  color: #8195a5;
  font-size: 0.54rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.section-block {
  padding: 42px 40px;
  border-top: 1px solid #e0ded8;
}

.block-heading {
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 28px;
}

.overline {
  margin: 0 0 4px;
  color: var(--blue);
  font-size: 0.57rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.block-heading h4 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.55rem;
  font-weight: 500;
  letter-spacing: -0.035em;
}

.text-button {
  padding: 7px 0;
  border: 0;
  border-bottom: 1px solid #bbc1c4;
  background: transparent;
  color: #596976;
  cursor: pointer;
  font-size: 0.65rem;
  font-weight: 800;
}

.text-button:hover {
  border-color: var(--accent);
  color: var(--ink);
}

.steps {
  border-top: 1px solid #d8d6d0;
}

.step-row {
  display: grid;
  grid-template-columns: 38px minmax(190px, 0.8fr) minmax(300px, 1.2fr);
  gap: 18px;
  align-items: start;
  padding: 22px 0;
  border-bottom: 1px solid #dedcd6;
}

.step-row__number {
  color: var(--accent);
  font: 700 0.64rem "SFMono-Regular", Consolas, monospace;
}

.step-row h5 {
  margin: 0;
  font-size: 0.78rem;
}

.step-row__explanation {
  margin: 7px 0 0;
  color: #798289;
  font-size: 0.63rem;
  line-height: 1.55;
}

.step-row__math {
  display: grid;
  gap: 7px;
  min-width: 0;
  padding: 13px 15px;
  border-left: 3px solid #cfdae2;
  background: #f5f6f4;
}

.step-row__formula {
  color: var(--blue);
  font-size: 0.61rem;
}

.step-row__numbers {
  overflow: hidden;
  color: #68737a;
  font: 0.59rem/1.45 "SFMono-Regular", Consolas, monospace;
  text-overflow: ellipsis;
}

.step-row__result {
  color: var(--ink);
  font-size: 0.73rem;
}

.block-heading__aside {
  max-width: 190px;
  margin: 0;
  color: #90979c;
  font-size: 0.62rem;
  line-height: 1.5;
  text-align: right;
}

.architecture-canvas {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  padding: 24px;
  overflow: hidden;
  border: 1px solid #d5d8d8;
  border-radius: 14px;
  background-color: #edf2f3;
  background-image: radial-gradient(#c8d1d4 0.8px, transparent 0.8px);
  background-size: 14px 14px;
}

.architecture-stage {
  position: relative;
  min-width: 0;
}

.architecture-stage:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -23px;
  z-index: 2;
  width: 18px;
  height: 1px;
  background: #84a2b5;
  content: "";
}

.architecture-stage:not(:last-child)::before {
  position: absolute;
  top: calc(50% - 3px);
  right: -23px;
  z-index: 3;
  width: 6px;
  height: 6px;
  border-top: 1px solid #84a2b5;
  border-right: 1px solid #84a2b5;
  content: "";
  transform: rotate(45deg);
}

.architecture-stage__label {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 10px;
  color: #405c70;
  font-size: 0.59rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.architecture-stage__label span {
  color: var(--accent);
  font: 700 0.55rem "SFMono-Regular", Consolas, monospace;
}

.architecture-stage__nodes {
  display: grid;
  gap: 10px;
}

.architecture-node {
  position: relative;
  display: grid;
  grid-template-columns: 8px 1fr;
  column-gap: 8px;
  min-height: 60px;
  padding: 12px;
  border: 1px solid #cbd3d5;
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 4px 12px rgba(32, 62, 80, 0.05);
}

.architecture-node__dot {
  width: 7px;
  height: 7px;
  margin-top: 2px;
  border: 2px solid #fff;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 1px var(--blue);
}

.architecture-stage:nth-child(2) .architecture-node__dot { background: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.architecture-stage:nth-child(3) .architecture-node__dot { background: var(--green); box-shadow: 0 0 0 1px var(--green); }

.architecture-node strong {
  font-size: 0.68rem;
}

.architecture-node small {
  grid-column: 2;
  margin-top: 4px;
  color: #8a9499;
  font-size: 0.55rem;
}

.architecture-node__connector {
  position: absolute;
  bottom: -13px;
  left: 50%;
  z-index: 2;
  color: #8ea7b6;
  font: normal 0.65rem sans-serif;
}

.scale-roadmap {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.scale-roadmap::before {
  position: absolute;
  top: 20px;
  right: 8%;
  left: 8%;
  height: 1px;
  background: #c7cbd0;
  content: "";
}

.scale-card {
  position: relative;
  padding: 0 16px 18px;
  border: 1px solid #ddd9d1;
  border-radius: 12px;
  background: #faf8f3;
}

.scale-card__top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: -1px -17px 14px;
  padding: 12px 16px;
  border: 1px solid #d7d5cf;
  border-radius: 11px 11px 0 0;
  background: var(--white);
}

.scale-card__index {
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-size: 0.55rem;
  font-weight: 850;
}

.scale-card:nth-child(2) .scale-card__index { background: var(--blue); }
.scale-card:nth-child(3) .scale-card__index { background: var(--accent); }

.scale-card h5 {
  margin: 0;
  font-size: 0.72rem;
}

.scale-card__trigger {
  min-height: 50px;
  margin: 0 0 12px;
  color: #707a82;
  font-size: 0.61rem;
  line-height: 1.5;
}

.scale-card__trigger span {
  display: block;
  margin-bottom: 3px;
  color: var(--accent);
  font-size: 0.53rem;
  font-weight: 850;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.scale-card ul {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.scale-card li {
  position: relative;
  padding-left: 13px;
  color: #4c5f6d;
  font-size: 0.6rem;
  line-height: 1.45;
}

.scale-card li::before {
  position: absolute;
  top: 0.52em;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #7e9eb1;
  content: "";
}

.decision-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.decision-card {
  position: relative;
  padding: 16px 16px 16px 38px;
  border-left: 3px solid #d7e5ec;
  background: #f5f8f8;
}

.decision-card__mark {
  position: absolute;
  top: 15px;
  left: 14px;
  color: var(--blue);
  font-size: 0.8rem;
}

.decision-card h5 {
  margin: 0;
  color: #334d60;
  font-size: 0.65rem;
}

.decision-card p {
  margin: 6px 0 0;
  color: #7a858b;
  font-size: 0.57rem;
  line-height: 1.5;
}

.method-section {
  padding: 110px 0;
  overflow: hidden;
  background: var(--ink);
  color: #fff;
}

.section-kicker--light {
  color: #8ca0af;
}

.section-kicker--light span {
  border-color: rgba(255, 255, 255, 0.2);
}

.method-layout {
  display: grid;
  grid-template-columns: minmax(320px, 0.8fr) minmax(520px, 1.2fr);
  gap: 90px;
  align-items: start;
}

.method-intro {
  position: sticky;
  top: 110px;
}

.method-intro h2 {
  color: #fff;
}

.method-intro > p {
  max-width: 520px;
  margin: 24px 0 0;
  color: #9db0bf;
  font-size: 0.86rem;
  line-height: 1.75;
}

.method-rule {
  margin-top: 34px;
  padding: 18px;
  border-left: 3px solid var(--accent);
  background: rgba(255, 255, 255, 0.05);
}

.method-rule strong,
.method-rule span {
  display: block;
}

.method-rule strong {
  color: #ffab89;
  font-size: 0.72rem;
}

.method-rule span {
  margin-top: 5px;
  color: #95a9b8;
  font-size: 0.64rem;
  line-height: 1.55;
}

.method-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  list-style: none;
}

.method-list li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 24px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.method-list li > span {
  color: var(--accent);
  font: 700 0.63rem "SFMono-Regular", Consolas, monospace;
}

.method-list h3 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.25rem;
  font-weight: 500;
}

.method-list p {
  margin: 6px 0 0;
  color: #8ea2b1;
  font-size: 0.64rem;
  line-height: 1.5;
}

.method-list code {
  padding: 8px 10px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  color: #81bce6;
  font-size: 0.59rem;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.guide-grid article {
  padding: 22px;
  border: 1px solid #d7d3ca;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.32);
}

.guide-icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--blue-soft);
  color: var(--blue);
  font: 700 0.85rem Georgia, serif;
}

.guide-grid article:nth-child(2) .guide-icon { background: var(--accent-soft); color: var(--accent); }
.guide-grid article:nth-child(3) .guide-icon { background: var(--green-soft); color: var(--green); }
.guide-grid article:nth-child(4) .guide-icon { background: var(--violet-soft); color: var(--violet); }

.guide-grid h3 {
  margin: 16px 0 12px;
  font-family: Georgia, serif;
  font-size: 1.12rem;
  font-weight: 500;
}

.guide-grid dl {
  margin: 0;
}

.guide-grid dl div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 0;
  border-top: 1px solid #dfdcd5;
  font-size: 0.63rem;
}

.guide-grid dt {
  color: #65727c;
}

.guide-grid dd {
  margin: 0;
  color: var(--ink);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-weight: 750;
}

footer {
  border-top: 1px solid #d4d0c7;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 104px;
}

.footer__inner p {
  margin: 0;
  color: #7d858b;
  font-size: 0.67rem;
  text-align: center;
}

.footer__inner > a:last-child {
  justify-self: end;
  color: #526270;
  font-size: 0.68rem;
  font-weight: 800;
  text-underline-offset: 4px;
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 50;
  max-width: min(360px, calc(100% - 48px));
  padding: 13px 16px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 10px;
  background: var(--ink);
  color: #fff;
  box-shadow: 0 16px 44px rgba(11, 31, 51, 0.24);
  font-size: 0.72rem;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.noscript {
  position: fixed;
  right: 16px;
  bottom: 16px;
  left: 16px;
  z-index: 60;
  padding: 14px;
  border-radius: 8px;
  background: #a31d1d;
  color: #fff;
  text-align: center;
}

@media (max-width: 1100px) {
  .topbar__inner {
    grid-template-columns: 1fr auto;
  }

  .topnav {
    display: none;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.85fr);
    gap: 42px;
  }

  .hero h1 {
    font-size: clamp(3.5rem, 7vw, 5rem);
  }

  .lab-toolbar {
    align-items: start;
    flex-direction: column;
  }

  .scenario-search {
    flex: none;
    width: 278px;
  }

  .category-filters {
    width: 100%;
  }

  .estimation-grid {
    grid-template-columns: 1fr;
  }

  .method-layout {
    gap: 50px;
  }
}

@media (max-width: 860px) {
  .page-shell,
  .topbar__inner {
    width: min(100% - 32px, 1240px);
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 58px;
  }

  .hero__copy {
    max-width: 720px;
  }

  .hero__visual {
    min-height: 480px;
  }

  .signal-strip__inner {
    justify-content: flex-start;
    gap: 20px;
    overflow: hidden;
  }

  .signal-strip span {
    flex: 0 0 auto;
  }

  .section-heading {
    align-items: start;
    flex-direction: column;
  }

  .precision-note {
    min-width: 0;
  }

  .lab-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .scenario-library {
    position: static;
    width: 100%;
    min-width: 0;
    padding-bottom: 14px;
    border-right: 0;
    border-bottom: 1px solid #dedbd4;
  }

  .scenario-list {
    grid-template-columns: none;
    grid-auto-flow: column;
    grid-auto-columns: minmax(180px, 1fr);
    width: 100%;
    max-width: 100%;
    padding-bottom: 4px;
    overflow-x: auto;
    scrollbar-width: thin;
  }

  .library__tip {
    display: none;
  }

  .step-row {
    grid-template-columns: 32px 1fr;
  }

  .step-row__math {
    grid-column: 2;
  }

  .architecture-canvas,
  .scale-roadmap,
  .decision-grid {
    grid-template-columns: 1fr;
  }

  .architecture-stage:not(:last-child)::after,
  .architecture-stage:not(:last-child)::before,
  .scale-roadmap::before {
    display: none;
  }

  .architecture-stage__nodes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .architecture-node__connector {
    display: none;
  }

  .scale-card__trigger {
    min-height: 0;
  }

  .method-layout {
    grid-template-columns: 1fr;
  }

  .method-intro {
    position: static;
  }

  .guide-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  .page-shell,
  .topbar__inner {
    width: min(100% - 20px, 1240px);
  }

  .topbar__inner {
    min-height: 62px;
  }

  .button--compact .button__icon {
    display: none;
  }

  .topbar .button {
    min-height: 34px;
    padding-inline: 10px;
  }

  .hero {
    gap: 36px;
    min-height: auto;
    padding-top: 42px;
    padding-bottom: 52px;
  }

  .hero h1 {
    font-size: clamp(3.1rem, 15vw, 4.4rem);
  }

  .hero__lede {
    font-size: 0.92rem;
  }

  .hero__actions {
    align-items: stretch;
    flex-direction: column;
    gap: 16px;
  }

  .text-link {
    text-align: center;
  }

  .hero__stats div {
    min-width: 0;
    padding-right: 14px;
    margin-right: 14px;
  }

  .hero__stats dt {
    font-size: 1.55rem;
  }

  .hero__stats dd {
    font-size: 0.53rem;
  }

  .hero__visual {
    min-height: 462px;
    padding: 24px;
    border-radius: 18px;
  }

  .visual__metric strong {
    font-size: 2.8rem;
  }

  .lab-section,
  .field-guide {
    padding-top: 80px;
    padding-bottom: 84px;
  }

  .section-heading h2,
  .method-intro h2 {
    font-size: 2.7rem;
  }

  .scenario-search {
    width: 100%;
  }

  .lab-layout {
    border-radius: 16px;
  }

  .scenario-list {
    grid-auto-columns: 210px;
  }

  .scenario-header {
    align-items: stretch;
    flex-direction: column;
    padding: 28px 20px 24px;
  }

  .scenario-header h3 {
    font-size: 2rem;
  }

  .scenario-header .button {
    align-self: start;
  }

  .estimation-grid {
    padding: 10px;
  }

  .panel {
    padding: 16px;
  }

  .input-grid,
  .metric-grid {
    grid-template-columns: 1fr 1fr;
  }

  .input-card__label {
    max-width: 120px;
  }

  .section-block {
    padding: 36px 20px;
  }

  .block-heading {
    align-items: start;
  }

  .block-heading__aside,
  .text-button {
    display: none;
  }

  .step-row {
    grid-template-columns: 24px 1fr;
    gap: 10px;
  }

  .step-row__math {
    padding: 11px;
  }

  .architecture-canvas {
    padding: 16px;
  }

  .architecture-stage__nodes {
    grid-template-columns: 1fr;
  }

  .method-section {
    padding: 80px 0;
  }

  .method-list li {
    grid-template-columns: 28px 1fr;
  }

  .method-list code {
    display: none;
  }

  .guide-grid {
    grid-template-columns: 1fr;
  }

  .footer__inner {
    grid-template-columns: 1fr auto;
    gap: 18px;
    min-height: 86px;
  }

  .footer__inner p {
    display: none;
  }
}

@media (max-width: 390px) {
  .input-grid,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .metric {
    min-height: 100px;
  }

  .topbar .button {
    font-size: 0.66rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}