:root {
  --paper: #f4efe5;
  --paper-2: #fbf8f1;
  --ink: #20231f;
  --ink-soft: #454a44;
  --muted: #626960;
  --line: #c9c2b5;
  --red: #a53f29;
  --red-dark: #7f2f20;
  --white: #fffdf8;
  --sans: "Glow Sans TC Normal", "未來熒黑 Normal", "Noto Sans TC", "PingFang TC", system-ui, sans-serif;
  --serif: "GenWanMin2 TC", "源雲明體丹", "Noto Serif TC", "Songti TC", ui-serif, serif;
  --num: "ChillDIN", "DIN Condensed", "Arial Narrow", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--serif);
  line-height: 1.8;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 18px;
  z-index: 10;
  padding: 10px 14px;
  color: var(--white);
  background: var(--ink);
  font: 700 0.875rem/1.4 var(--sans);
  clip-path: inset(50%);
  transform: translateY(-120%);
  transition: transform 140ms cubic-bezier(0.16, 1, 0.3, 1);
}

.skip-link:focus {
  clip-path: none;
  transform: translateY(0);
}

.site-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 920px);
  gap: 54px;
  width: min(100%, 1280px);
  margin-inline: auto;
  padding: 32px 34px 100px;
}

.site-toc {
  position: sticky;
  top: 24px;
  align-self: start;
  max-height: calc(100dvh - 48px);
  overflow-x: hidden;
  overflow-y: auto;
  border-top: 8px solid var(--red);
  padding-top: 24px;
  font-family: var(--sans);
  scrollbar-width: none;
}

.site-toc::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.toc-kicker {
  margin: 0;
  color: var(--red);
  font: 800 0.8125rem/1 var(--num);
  letter-spacing: 0.16em;
}

.toc-title {
  margin: 13px 0 22px;
  font: 800 1.125rem/1.4 var(--sans);
}

.site-toc ol {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.site-toc li {
  border-bottom: 1px solid var(--line);
}

.site-toc nav a {
  position: relative;
  display: block;
  padding: 10px 2px;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.55;
  text-decoration: none;
  transition: color 220ms cubic-bezier(0.16, 1, 0.3, 1), transform 220ms cubic-bezier(0.16, 1, 0.3, 1);
}

.site-toc nav a:hover,
.site-toc nav a:focus-visible {
  color: var(--red);
}

.site-toc nav a.is-current {
  color: var(--red-dark);
  font-weight: 800;
  transform: translateX(10px);
}

.site-toc nav a.is-current::before {
  position: absolute;
  top: 50%;
  left: -12px;
  width: 7px;
  height: 2px;
  background: var(--red);
  content: "";
  transform: translateY(-50%);
}

.toc-action {
  display: block;
  margin-top: 24px;
  padding: 11px 14px;
  border: 1px solid var(--red);
  color: var(--white);
  background: var(--red);
  font: 750 0.875rem/1.5 var(--sans);
  text-align: center;
  text-decoration: none;
}

.toc-action:hover {
  border-color: var(--red-dark);
  background: var(--red-dark);
}

.site-content {
  min-width: 0;
}

.mobile-nav {
  display: none;
}

.hero {
  border-top: 1px solid var(--ink);
  padding-top: 20px;
}

.hero-meta {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  font: 700 0.8125rem/1.3 var(--sans);
  letter-spacing: 0.08em;
}

.hero-copy {
  max-width: 1040px;
  margin-top: clamp(48px, 7vw, 82px);
}

.hero-kicker {
  margin: 0 0 18px;
  color: var(--red);
  font: 750 0.875rem/1.4 var(--sans);
  letter-spacing: 0.08em;
}

h1 {
  max-width: 980px;
  margin: 0;
  font: 800 clamp(3.25rem, 7vw, 5.5rem)/1.02 var(--sans);
  letter-spacing: -0.055em;
}

h1 span {
  display: block;
}

.hero-lead {
  max-width: 760px;
  margin: 28px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.125rem, 2vw, 1.4375rem);
  line-height: 1.55;
}

.hero-position {
  max-width: 1040px;
  margin: 40px 0 0;
  padding: 24px 30px;
  border-left: 10px solid var(--red);
  background: var(--paper-2);
  font: 750 clamp(1.25rem, 2.4vw, 1.75rem)/1.5 var(--serif);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  font-family: var(--sans);
}

.hero-visual {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 34px;
  border: 1px solid var(--line);
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border: 1px solid var(--ink);
  font-weight: 750;
  line-height: 1.4;
  text-decoration: none;
  transition: opacity 140ms cubic-bezier(0.16, 1, 0.3, 1), transform 140ms cubic-bezier(0.16, 1, 0.3, 1);
}

.button-primary {
  border-color: var(--red);
  color: var(--white);
  background: var(--red);
}

.button-secondary {
  background: transparent;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary:hover {
  background: var(--red-dark);
  border-color: var(--red-dark);
}

.button-secondary:hover {
  color: var(--red-dark);
  border-color: var(--red-dark);
}

.narrative-section {
  position: relative;
  scroll-margin-top: 28px;
  margin-top: clamp(96px, 13vw, 168px);
  border-top: 2px solid var(--ink);
  padding-top: 28px;
}

.narrative-section::before {
  position: absolute;
  top: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--ink);
  content: "";
  transform-origin: left center;
}

.scroll-motion-ready .narrative-section {
  border-top-color: transparent;
  opacity: 0.2;
  transform: translateY(48px);
  transition: opacity 520ms cubic-bezier(0.16, 1, 0.3, 1), transform 700ms cubic-bezier(0.16, 1, 0.3, 1);
}

.scroll-motion-ready .narrative-section::before {
  transform: scaleX(0.08);
  transition: background-color 220ms cubic-bezier(0.16, 1, 0.3, 1), transform 700ms cubic-bezier(0.16, 1, 0.3, 1);
}

.scroll-motion-ready .narrative-section .section-heading,
.scroll-motion-ready .narrative-section > :not(.section-heading) {
  opacity: 0.25;
  transform: translateY(24px);
  transition: opacity 520ms cubic-bezier(0.16, 1, 0.3, 1) 100ms, transform 650ms cubic-bezier(0.16, 1, 0.3, 1) 100ms;
}

.scroll-motion-ready .narrative-section > :not(.section-heading) {
  transform: translateY(34px);
  transition-delay: 180ms;
}

.scroll-motion-ready .narrative-section.is-visible,
.scroll-motion-ready .narrative-section.is-visible .section-heading,
.scroll-motion-ready .narrative-section.is-visible > :not(.section-heading) {
  opacity: 1;
  transform: none;
}

.scroll-motion-ready .narrative-section.is-visible::before {
  transform: scaleX(1);
}

.narrative-section.is-current-section::before {
  background: var(--red);
}

.section-heading {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.section-number {
  color: var(--red);
  font: 800 clamp(2rem, 4vw, 3rem)/1 var(--num);
}

.section-kicker {
  margin: 0 0 8px;
  color: var(--red);
  font: 750 0.8125rem/1.4 var(--sans);
  letter-spacing: 0.1em;
}

h2 {
  max-width: 840px;
  margin: 0;
  font: 800 clamp(2rem, 4.5vw, 4rem)/1.12 var(--sans);
  letter-spacing: -0.04em;
}

.problem-list,
.service-stack {
  margin-top: clamp(42px, 6vw, 70px);
}

.problem-row {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) auto;
  gap: 26px;
  align-items: center;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}

.problem-row-primary {
  padding-inline: 24px;
  border-left: 8px solid var(--red);
  background: var(--paper-2);
}

.problem-index,
.service-label {
  color: var(--red);
  font: 800 0.875rem/1.4 var(--sans);
  letter-spacing: 0.08em;
}

.problem-copy h3,
.service-intro h3 {
  margin: 0;
  font: 800 clamp(1.4rem, 2.8vw, 2.15rem)/1.25 var(--sans);
  letter-spacing: -0.025em;
}

.problem-copy p {
  max-width: 720px;
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 1.0625rem;
  line-height: 1.7;
}

.text-link {
  color: var(--red-dark);
  font: 750 0.9375rem/1.5 var(--sans);
  text-underline-offset: 5px;
  white-space: nowrap;
}

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

.service-path {
  scroll-margin-top: 24px;
  display: grid;
  grid-template-columns: minmax(240px, 0.85fr) minmax(0, 1.5fr);
  gap: clamp(34px, 6vw, 84px);
  padding: clamp(36px, 5vw, 62px) 0;
  border-top: 1px solid var(--line);
}

.service-path-primary {
  padding-inline: clamp(24px, 4vw, 48px);
  border-top-color: var(--ink);
  border-left: 10px solid var(--red);
  background: var(--paper-2);
}

.service-label {
  margin: 0 0 12px;
}

.service-statement {
  max-width: 440px;
  margin: 14px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.0625rem, 1.8vw, 1.25rem);
  line-height: 1.65;
}

.service-details {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(28px, 4vw, 54px);
}

.service-details h4 {
  margin: 0 0 12px;
  color: var(--red-dark);
  font: 750 0.875rem/1.4 var(--sans);
  letter-spacing: 0.08em;
}

.service-details p,
.service-details ul {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.75;
}

.service-details ul {
  padding-left: 1.25em;
}

.service-details .text-link {
  display: inline-block;
  margin-top: 18px;
}

.section-intro {
  max-width: 780px;
  margin: 22px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.0625rem, 1.8vw, 1.25rem);
  line-height: 1.7;
}

.pricing-list {
  margin-top: clamp(48px, 7vw, 76px);
  border-bottom: 1px solid var(--line);
}

.pricing-tier {
  display: grid;
  grid-template-columns: 54px minmax(240px, 0.9fr) minmax(280px, 1.1fr);
  gap: clamp(20px, 4vw, 56px);
  align-items: start;
  padding: clamp(32px, 4.5vw, 52px) 0;
  border-top: 1px solid var(--line);
}

.pricing-tier-discovery {
  padding-inline: clamp(20px, 3.5vw, 44px);
  border-top-color: var(--ink);
  border-left: 10px solid var(--red);
  background: var(--paper-2);
}

.pricing-index {
  color: var(--red);
  font: 800 1.125rem/1.4 var(--num);
}

.pricing-label {
  margin: 0 0 10px;
  color: var(--red-dark);
  font: 750 0.8125rem/1.4 var(--sans);
  letter-spacing: 0.08em;
}

.pricing-copy h3 {
  margin: 0;
  font: 750 clamp(1.5rem, 2.6vw, 2rem)/1.3 var(--serif);
}

.pricing-copy > p:not(.pricing-label) {
  margin: 16px 0 0;
  color: var(--ink-soft);
  line-height: 1.75;
}

.pricing-copy .pricing-terms {
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--ink);
  font-weight: 700;
}

.pricing-price {
  margin: 0;
  font: 800 clamp(1.75rem, 3.5vw, 2.75rem)/1.15 var(--sans);
  letter-spacing: -0.035em;
}

.pricing-cost h4 {
  margin: 28px 0 10px;
  color: var(--red-dark);
  font: 750 0.8125rem/1.4 var(--sans);
  letter-spacing: 0.08em;
}

.pricing-cost ul {
  margin: 0;
  padding-left: 1.25em;
  color: var(--ink-soft);
  line-height: 1.75;
}

.pricing-note {
  display: grid;
  grid-template-columns: minmax(120px, 0.25fr) minmax(0, 1fr);
  gap: 24px;
  margin-top: 28px;
  padding: 24px 28px;
  border-left: 5px solid var(--red);
  background: var(--paper-2);
}

.pricing-note strong {
  color: var(--red-dark);
  font: 750 0.875rem/1.6 var(--sans);
  letter-spacing: 0.08em;
}

.pricing-note p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.7;
}

.case-group {
  margin-top: clamp(48px, 7vw, 80px);
}

.case-group-heading {
  display: grid;
  grid-template-columns: minmax(180px, 0.42fr) minmax(0, 1.58fr);
  gap: 8px clamp(28px, 6vw, 84px);
  align-items: start;
  padding-top: 22px;
  border-top: 1px solid var(--ink);
}

.case-group-heading .case-group-label {
  grid-row: span 2;
  margin: 4px 0 0;
  color: var(--red);
  font: 800 0.8125rem/1.5 var(--sans);
  letter-spacing: 0.09em;
}

.case-group-heading h3 {
  margin: 0;
  font: 800 clamp(1.55rem, 2.8vw, 2.35rem)/1.2 var(--sans);
  letter-spacing: -0.035em;
}

.case-group-heading > p:last-child {
  margin: 6px 0 0;
  max-width: 760px;
  color: var(--ink-soft);
  line-height: 1.75;
}

.commercial-case-list {
  margin-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--line);
}

.commercial-case {
  display: grid;
  grid-template-columns: minmax(180px, 0.42fr) minmax(0, 1.58fr);
  gap: clamp(28px, 6vw, 84px);
  padding: clamp(32px, 5vw, 58px) 0;
  border-bottom: 1px solid var(--line);
}

.commercial-case-meta > p:last-child {
  margin: 18px 0 0;
  color: var(--ink-soft);
  font: 700 0.875rem/1.65 var(--sans);
}

.commercial-case-copy {
  max-width: 800px;
}

.commercial-case-copy h4 {
  margin: 0;
  font: 800 clamp(1.5rem, 2.5vw, 2.1rem)/1.2 var(--sans);
  letter-spacing: -0.035em;
}

.commercial-case-copy .case-evidence-note strong {
  margin-bottom: 5px;
}

.demo-cases-heading {
  margin-top: clamp(64px, 9vw, 112px);
}

.case-showcase {
  margin-top: clamp(32px, 5vw, 56px);
}

.case-study {
  display: grid;
  align-items: start;
}

.case-study-primary {
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.85fr);
  gap: clamp(32px, 5vw, 68px);
  padding: clamp(24px, 3vw, 38px);
  border-left: 10px solid var(--red);
  background: var(--paper-2);
}

.case-visual {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--white);
}

.case-image {
  display: block;
  width: 100%;
  height: auto;
}

.case-copy {
  min-width: 0;
}

.case-index {
  margin: 0 0 12px;
  color: var(--red);
  font: 800 0.8125rem/1.4 var(--sans);
  letter-spacing: 0.09em;
}

.case-copy h3 {
  margin: 0;
  font: 800 clamp(1.65rem, 3vw, 2.6rem)/1.15 var(--sans);
  letter-spacing: -0.035em;
}

.case-summary {
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  line-height: 1.7;
}

.case-evidence {
  margin: 28px 0 0;
}

.case-evidence div {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.case-evidence dt,
.case-evidence-note strong {
  color: var(--red-dark);
  font: 750 0.8125rem/1.5 var(--sans);
  letter-spacing: 0.07em;
}

.case-evidence dd {
  margin: 5px 0 0;
  color: var(--ink-soft);
  line-height: 1.7;
}

.case-status {
  margin: 22px 0 18px;
  padding-top: 14px;
  border-top: 1px solid var(--ink);
  color: var(--ink);
  font: 750 0.8125rem/1.5 var(--sans);
  letter-spacing: 0.06em;
}

.case-status span + span::before {
  content: " / ";
  color: var(--red);
}

.case-index-list {
  margin-top: clamp(54px, 8vw, 96px);
  border-top: 1px solid var(--ink);
}

.case-study-secondary {
  grid-template-columns: minmax(280px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(30px, 6vw, 88px);
  padding: clamp(38px, 6vw, 72px) 0;
  border-bottom: 1px solid var(--line);
}

.case-study-secondary:nth-child(even) {
  grid-template-columns: minmax(0, 1.28fr) minmax(280px, 0.72fr);
}

.case-study-secondary:nth-child(even) .case-visual {
  order: 2;
}

.case-study-secondary .case-copy {
  align-self: center;
  max-width: 680px;
}

.case-study-secondary .case-copy h3 {
  font-size: clamp(1.55rem, 2.5vw, 2.2rem);
}

.case-evidence-note {
  margin: 22px 0 0;
  color: var(--ink-soft);
  line-height: 1.75;
}

.case-evidence-note strong {
  display: block;
  margin-bottom: 5px;
}

.case-link {
  display: inline-block;
  white-space: normal;
}

.work-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: center;
  margin-top: 36px;
  padding: 24px 0;
  border-bottom: 1px solid var(--ink);
}

.work-footer p {
  margin: 0;
  font-size: 1.0625rem;
}

.capability-layout {
  display: grid;
  grid-template-columns: minmax(220px, 0.62fr) minmax(0, 1.38fr);
  gap: clamp(42px, 8vw, 112px);
  align-items: start;
  margin-top: clamp(48px, 7vw, 80px);
}

.capability-principle {
  padding: 26px 24px;
  border-left: 10px solid var(--red);
  background: var(--paper-2);
}

.capability-principle-label {
  margin: 0 0 10px;
  color: var(--red-dark);
  font: 750 0.8125rem/1.4 var(--sans);
  letter-spacing: 0.09em;
}

.capability-principle p:last-child {
  margin: 0;
  font-size: clamp(1.1rem, 1.7vw, 1.3rem);
  font-weight: 700;
  line-height: 1.65;
}

.capability-flow {
  border-top: 1px solid var(--ink);
}

.capability-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: clamp(16px, 3vw, 34px);
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}

.capability-index {
  color: var(--red);
  font: 800 0.9375rem/1.5 var(--num);
}

.capability-item h3 {
  margin: 0;
  font: 800 clamp(1.35rem, 2.3vw, 1.8rem)/1.3 var(--sans);
  letter-spacing: -0.025em;
}

.capability-item p {
  max-width: 680px;
  margin: 10px 0 0;
  color: var(--ink-soft);
  line-height: 1.75;
}

.technical-details {
  margin-top: 34px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--line);
  font-family: var(--serif);
}

.technical-details summary {
  min-height: 52px;
  padding: 13px 0;
  color: var(--red-dark);
  cursor: pointer;
  font: 750 0.9375rem/1.6 var(--sans);
}

.technical-details p {
  max-width: 820px;
  margin: 0;
  padding: 0 0 24px 24px;
  color: var(--ink-soft);
  line-height: 1.75;
}

.process-track {
  max-width: 1040px;
  margin-top: clamp(48px, 7vw, 80px);
  margin-left: 0;
  border-top: 1px solid var(--ink);
}

.process-step {
  display: grid;
  grid-template-columns: 54px minmax(210px, 0.62fr) minmax(0, 1.38fr);
  gap: clamp(18px, 4vw, 54px);
  align-items: start;
  padding: clamp(28px, 4vw, 42px) 0;
  border-bottom: 1px solid var(--line);
}

.process-number {
  color: var(--red);
  font: 800 1rem/1.5 var(--num);
}

.process-step h3 {
  margin: 0;
  font: 800 clamp(1.35rem, 2.4vw, 1.9rem)/1.3 var(--sans);
  letter-spacing: -0.025em;
}

.process-step p {
  max-width: 620px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.0625rem;
  line-height: 1.75;
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(42px, 7vw, 96px);
  max-width: 1120px;
  margin-top: clamp(48px, 7vw, 80px);
  border-top: 1px solid var(--ink);
}

.boundary-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 8px 18px;
  align-content: start;
  padding: clamp(28px, 4vw, 42px) 0;
  border-bottom: 1px solid var(--line);
}

.boundary-index {
  grid-row: 1 / span 2;
  color: var(--red);
  font: 800 0.9375rem/1.5 var(--num);
}

.boundary-item h3 {
  margin: 0;
  font: 800 clamp(1.3rem, 2vw, 1.65rem)/1.35 var(--sans);
  letter-spacing: -0.025em;
}

.boundary-item p {
  max-width: 500px;
  margin: 10px 0 0;
  color: var(--ink-soft);
  line-height: 1.75;
}

.faq-list {
  max-width: 960px;
  margin-top: clamp(48px, 7vw, 80px);
  border-top: 1px solid var(--ink);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  min-height: 72px;
  padding: 20px 12px 20px 4px;
  cursor: pointer;
  font: 800 clamp(1.15rem, 2vw, 1.45rem)/1.45 var(--sans);
  letter-spacing: -0.015em;
}

.faq-item summary::marker {
  color: var(--red);
}

.faq-item[open] summary {
  color: var(--red-dark);
}

.faq-item p {
  max-width: 760px;
  margin: 0;
  padding: 0 24px 26px 28px;
  color: var(--ink-soft);
  font-size: 1.0625rem;
  line-height: 1.75;
}

.brief-intro {
  max-width: 720px;
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 1.8vw, 1.2rem);
  line-height: 1.75;
}

.brief-form {
  max-width: 960px;
  margin-top: clamp(48px, 7vw, 80px);
  border-top: 1px solid var(--ink);
}

.brief-question {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 24px;
  min-width: 0;
  margin: 0;
  padding: 38px 4px;
  border: 0;
  border-bottom: 1px solid var(--line);
}

.brief-question.is-invalid {
  border-left: 5px solid var(--red);
  padding-left: 20px;
}

.brief-number {
  padding-top: 4px;
  color: var(--red);
  font: 800 0.875rem/1 var(--sans);
}

.brief-question-body {
  min-width: 0;
}

.brief-question legend {
  width: 100%;
  margin: 0 0 20px;
  padding: 0;
  color: var(--ink);
  font: 800 clamp(1.3rem, 2.4vw, 1.65rem)/1.35 var(--sans);
  letter-spacing: -0.02em;
}

.brief-helper {
  max-width: 720px;
  margin: -8px 0 16px;
  color: var(--muted);
  font: 400 0.95rem/1.65 var(--sans);
}

.brief-label {
  display: block;
  margin: 24px 0 8px;
  color: var(--ink);
  font: 700 1rem/1.5 var(--sans);
}

.brief-label span {
  color: var(--muted);
  font-weight: 500;
}

.brief-question input[type="text"],
.brief-question input[type="email"],
.brief-question input[type="url"],
.brief-question textarea,
.brief-result textarea {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  font: 400 1rem/1.65 var(--sans);
}

.brief-question input[type="text"],
.brief-question input[type="email"],
.brief-question input[type="url"] {
  padding: 10px 12px;
}

.brief-question textarea,
.brief-result textarea {
  display: block;
  padding: 12px;
  resize: vertical;
}

.brief-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 14px;
}

.brief-option {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  min-height: 48px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink-soft);
  cursor: pointer;
  font: 600 0.975rem/1.45 var(--sans);
}

.brief-option:has(input:checked) {
  border-color: var(--red-dark);
  color: var(--ink);
  outline: 2px solid var(--red);
  outline-offset: -2px;
}

.brief-option input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--red-dark);
}

.brief-error,
.brief-status {
  margin: 10px 0 0;
  color: var(--red-dark);
  font: 700 0.9rem/1.5 var(--sans);
}

.brief-error[hidden],
.brief-result[hidden] {
  display: none;
}

.brief-submit {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  padding-top: 28px;
}

.brief-form .button,
.brief-result .button {
  cursor: pointer;
  font-family: var(--sans);
}

.brief-form .button:disabled,
.brief-result .button:disabled {
  cursor: wait;
  opacity: 0.68;
}

.brief-honeypot {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.brief-result {
  max-width: 960px;
  margin-top: 48px;
  padding: clamp(24px, 5vw, 44px);
  border-left: 10px solid var(--red);
  background: var(--paper-2);
}

.brief-result h3 {
  margin: 0;
  font: 850 clamp(1.55rem, 3vw, 2.15rem)/1.25 var(--sans);
  letter-spacing: -0.025em;
}

.brief-result > p {
  max-width: 720px;
  margin: 16px 0 0;
  color: var(--ink-soft);
  line-height: 1.7;
}

.brief-result textarea {
  min-height: 390px;
}

.brief-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  margin-top: 20px;
}

.contact-intro {
  max-width: 720px;
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 1.8vw, 1.2rem);
  line-height: 1.75;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: clamp(42px, 8vw, 96px);
  align-items: end;
  max-width: 960px;
  margin-top: clamp(48px, 7vw, 80px);
  padding: clamp(28px, 5vw, 48px) 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.contact-name {
  margin: 0 0 24px;
  font: 850 clamp(1.8rem, 3.5vw, 2.8rem)/1.15 var(--sans);
  letter-spacing: -0.035em;
}

.contact-list {
  margin: 0;
}

.contact-list > div {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 18px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.contact-list dt {
  color: var(--red);
  font: 800 0.8125rem/1.7 var(--num);
  letter-spacing: 0.08em;
}

.contact-list dd {
  min-width: 0;
  margin: 0;
  font: 700 1rem/1.6 var(--sans);
  overflow-wrap: anywhere;
}

.contact-list a {
  text-decoration-color: var(--red);
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}

.contact-list a:hover {
  color: var(--red-dark);
}

.contact-note {
  max-width: 620px;
  margin: 26px 0 0;
  color: var(--ink-soft);
}

.contact-qr {
  margin: 0;
}

.contact-qr img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--white);
}

.contact-qr figcaption {
  margin-top: 10px;
  color: var(--muted);
  font: 650 0.8125rem/1.5 var(--sans);
  text-align: center;
}

.brief-question input:focus-visible,
.brief-question textarea:focus-visible,
.brief-result textarea:focus-visible {
  outline: 2px solid var(--red-dark);
  outline-offset: 3px;
}

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

@media (max-width: 900px) {
  .site-layout {
    display: block;
    padding: 18px 18px 70px;
  }

  .site-toc {
    display: none;
  }

  .mobile-nav {
    display: block;
    margin-bottom: 25px;
    border-top: 6px solid var(--red);
    border-bottom: 1px solid var(--line);
    font-family: var(--sans);
  }

  .mobile-nav summary {
    min-height: 48px;
    padding: 12px 2px;
    color: var(--ink);
    cursor: pointer;
    font: 750 0.875rem/1.6 var(--sans);
  }

  .mobile-nav summary::marker {
    color: var(--red);
  }

  .mobile-nav-links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-top: 1px solid var(--line);
  }

  .mobile-nav-links a {
    min-height: 44px;
    padding: 10px 2px;
    border-bottom: 1px solid var(--line);
    color: var(--muted);
    font-size: 0.875rem;
    text-decoration: none;
  }

  .mobile-nav-links a.is-current {
    color: var(--red-dark);
    font-weight: 800;
  }
}

@media (max-width: 560px) {
  .site-shell {
    padding-top: 18px;
    padding-bottom: 48px;
  }

  .hero-meta {
    display: block;
  }

  .hero-meta span {
    display: block;
    margin-bottom: 7px;
  }

  .hero-copy {
    margin-top: 38px;
  }

  h1 {
    font-size: clamp(3rem, 13vw, 3.5rem);
  }

  .hero-lead {
    margin-top: 22px;
    font-size: 1.125rem;
  }

  .hero-position {
    margin-top: 28px;
    padding: 20px 18px;
    font-size: 1.25rem;
  }

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }
}

@media (max-width: 760px) {
  .narrative-section {
    margin-top: 88px;
    padding-top: 22px;
  }

  .section-heading {
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 12px;
  }

  .problem-list,
  .service-stack,
  .pricing-list,
  .case-showcase,
  .capability-layout,
  .process-track,
  .boundary-list,
  .faq-list,
  .brief-form {
    margin-top: 38px;
  }

  .problem-row,
  .problem-row-primary {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 8px 12px;
    padding: 24px 0;
  }

  .problem-row-primary {
    padding-inline: 16px;
  }

  .problem-row .text-link {
    grid-column: 2;
    margin-top: 8px;
    white-space: normal;
  }

  .service-path,
  .service-path-primary {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 34px 0;
  }

  .service-path-primary {
    padding-inline: 16px;
  }

  .service-details {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .pricing-tier,
  .pricing-tier-discovery {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px 12px;
    padding: 30px 0;
  }

  .pricing-tier-discovery {
    padding-inline: 16px;
  }

  .pricing-cost {
    grid-column: 2;
    margin-top: 10px;
  }

  .pricing-price {
    font-size: clamp(1.4rem, 6.3vw, 1.65rem);
    letter-spacing: -0.045em;
  }

  .pricing-note {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 20px;
  }

  .case-group {
    margin-top: 38px;
  }

  .case-group-heading,
  .commercial-case {
    grid-template-columns: 1fr;
  }

  .case-group-heading {
    gap: 8px;
  }

  .case-group-heading .case-group-label {
    grid-row: auto;
  }

  .commercial-case {
    gap: 22px;
    padding: 32px 0;
  }

  .commercial-case-meta > p:last-child {
    margin-top: 10px;
  }

  .demo-cases-heading {
    margin-top: 72px;
  }

  .case-study-primary,
  .case-study-secondary,
  .case-study-secondary:nth-child(even) {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .case-study-primary {
    padding: 20px 16px;
  }

  .case-index-list {
    margin-top: 52px;
  }

  .case-study-secondary {
    padding: 36px 0;
  }

  .case-study-secondary:nth-child(even) .case-visual {
    order: 0;
  }

  .case-copy h3,
  .case-study-secondary .case-copy h3 {
    font-size: clamp(1.55rem, 7vw, 1.9rem);
  }

  .work-footer {
    display: grid;
    align-items: stretch;
  }

  .work-footer .button {
    width: 100%;
  }

  .capability-layout {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .capability-principle {
    padding: 22px 18px;
  }

  .capability-item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 12px;
    padding: 26px 0;
  }

  .technical-details p {
    padding-left: 0;
  }

  .process-track {
    margin-left: 0;
  }

  .process-step {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 8px 12px;
    margin-left: 0;
    padding: 26px 0;
  }

  .process-step p {
    grid-column: 2;
    margin-top: 6px;
  }

  .boundary-list {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .boundary-item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 6px 12px;
    padding: 26px 0;
  }

  .faq-item summary {
    min-height: 64px;
    padding: 18px 8px 18px 2px;
  }

  .faq-item p {
    padding: 0 8px 24px 20px;
    font-size: 1rem;
  }

  .brief-question {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 12px;
    padding: 28px 0;
  }

  .brief-question.is-invalid {
    padding-left: 12px;
  }

  .brief-options {
    grid-template-columns: 1fr;
  }

  .brief-submit,
  .brief-actions {
    display: grid;
    align-items: stretch;
  }

  .brief-submit .button,
  .brief-actions .button {
    width: 100%;
  }

  .brief-result {
    margin-top: 38px;
    padding: 24px 18px;
    border-left-width: 6px;
  }

  .brief-result textarea {
    min-height: 440px;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 34px;
    align-items: start;
  }

  .contact-qr {
    width: min(200px, 62vw);
  }

  .contact-list > div {
    grid-template-columns: 62px minmax(0, 1fr);
    gap: 12px;
  }
}

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

  .skip-link,
  .button,
  .site-toc nav a,
  .scroll-motion-ready .narrative-section,
  .scroll-motion-ready .narrative-section::before,
  .scroll-motion-ready .narrative-section .section-heading,
  .scroll-motion-ready .narrative-section > :not(.section-heading) {
    transition: none;
  }

  .scroll-motion-ready .narrative-section,
  .scroll-motion-ready .narrative-section .section-heading,
  .scroll-motion-ready .narrative-section > :not(.section-heading) {
    opacity: 1;
    transform: none;
  }

  .scroll-motion-ready .narrative-section::before {
    transform: none;
  }
}