/* Mars Walker — quiet product site. Not affiliated with OpenAI. */
/* Checked widths: 375, 390, 768, 1440, 1920, 2560. */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f6f6;
  --text: #111111;
  --text-muted: #5c5c5c;
  --text-faint: #666666;
  --line: rgba(0, 0, 0, 0.1);
  --line-strong: rgba(0, 0, 0, 0.16);
  --accent: #111111;
  --accent-invert: #ffffff;
  --radius: 16px;
  --gutter: clamp(1.25rem, 4vw, 5.5rem);
  --measure: 40rem;
  --nav-h: 72px;
  --font: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --font-cjk: "Segoe UI", "PingFang HK", "PingFang TC", "PingFang SC", "Hiragino Sans", "Noto Sans TC", "Noto Sans JP", "Noto Sans Thai", "Leelawadee UI", "Microsoft JhengHei", "Microsoft YaHei", "Yu Gothic UI", system-ui, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "Segoe UI Mono", Menlo, Consolas, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { max-width: 100%; overflow-x: clip; }
body {
  margin: 0;
  font-family: var(--font-cjk);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
a:hover { opacity: 1; }
button, input, textarea, select { font: inherit; color: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
::selection { background: #111111; color: #ffffff; }

.container {
  width: 100%;
  max-width: none;
  padding-inline: var(--gutter);
  margin-inline: 0;
}
.prose,
.form,
.hero-lead,
.split-intro,
.talk-lead,
.section-head p {
  max-width: var(--measure);
}

.eyebrow,
.mono {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}
.eyebrow::before {
  content: "✳";
  font-family: var(--font-cjk);
  letter-spacing: 0;
  font-size: 0.85em;
}
.kicker {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.talk-row-main { flex-wrap: wrap; }
.talk-row-main .copy-status { flex-basis: 100%; margin-top: 0.35rem; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(140%) blur(16px);
  -webkit-backdrop-filter: saturate(140%) blur(16px);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled,
.site-header:has(.is-open) {
  border-bottom-color: var(--line);
}
.nav {
  height: var(--nav-h);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
  min-width: 0;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 560;
  letter-spacing: -0.03em;
  font-size: 0.95rem;
  white-space: nowrap;
}
.logo-mark {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1.5px solid var(--text);
  position: relative;
  flex-shrink: 0;
}
.logo-mark::after {
  content: "";
  position: absolute;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text);
  top: 2px;
  right: 2px;
}
.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(1.1rem, 2vw, 2rem);
  min-width: 0;
}
.nav-links a {
  font-size: 0.92rem;
  color: #3a3a3a;
  font-weight: 450;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.lang-select {
  appearance: none;
  background: transparent;
  border: 0;
  border-radius: 999px;
  padding: 0.4rem 1.4rem 0.4rem 0.2rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666666' d='M2.5 4.2L6 8l3.5-3.8' fill='none' stroke='%23666666' stroke-width='1.2'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.15rem center;
}
.lang-select:hover { color: var(--text); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 44px;
  padding: 0.65rem 1.15rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn-primary {
  background: var(--accent);
  color: var(--accent-invert);
}
.btn-primary:hover { background: #000000; }
.btn-ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--text); }
.btn-lg { padding: 0.8rem 1.25rem; }
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 44px;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.text-link:hover { gap: 0.6rem; }
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--text);
  position: relative;
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: var(--text);
}
.nav-toggle span::before { top: -5px; }
.nav-toggle span::after { top: 5px; }

/* Hero */
.hero {
  position: relative;
  padding: 2.5rem 0 1.5rem;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.22fr) minmax(16rem, 0.78fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  min-height: clamp(32rem, calc(100svh - var(--nav-h) - 8rem), 44rem);
}
.hero-copy { max-width: 40rem; }
.hero-eyebrow { margin-bottom: 1.75rem; }
.hero h1 {
  font-size: clamp(2.55rem, 4.5vw, 4.7rem);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 1.05;
  text-wrap: balance;
}
.icon { width: 14px; height: 14px; flex: none; }
.hero-line { display: block; }
.hero-line-muted { color: #6b6b6b; }
.hero-lead {
  margin-top: 1.75rem;
  font-size: clamp(1.02rem, 1.4vw, 1.15rem);
  line-height: 1.65;
  color: var(--text-muted);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 1.25rem;
  margin-top: 2rem;
}
.orb-frame {
  position: relative;
  min-width: 0;
}
.orb-coordinate {
  margin: 0 0 0.5rem;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.orb-coordinate span { margin-left: 0.85rem; }
.orb-svg { width: 100%; height: auto; }
.orb-float { animation: orb-float 9s var(--ease) infinite alternate; }
.orb-caption {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  margin-top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.hero-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--text-faint);
  font-size: 0.92rem;
}
.scroll-cue {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  flex-shrink: 0;
}
.scroll-cue:hover { border-color: var(--text); }

@keyframes orb-float {
  from { transform: translateY(0); }
  to { transform: translateY(-12px); }
}

/* Platform strip */
.platform-strip {
  border-top: 1px solid var(--line);
  padding: 1.35rem 0;
}
.platform-row {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 3vw, 3rem);
}
.platform-label {
  flex: 0 0 auto;
  max-width: 12rem;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--text-faint);
}
.platform-names {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.5rem;
}
.platform-names li {
  font-size: 0.95rem;
  font-weight: 560;
  letter-spacing: -0.02em;
  color: #2a2a2a;
}

/* Sections */
.section { padding: clamp(4.5rem, 8vw, 7.5rem) 0; }
.section-muted { background: var(--bg-soft); }
#solutions,
#process,
#insights,
#regions,
#talk { scroll-margin-top: calc(var(--nav-h) + 0.75rem); }
.split-head {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.8fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: end;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}
.split-head h2,
.section-head h2,
.page-hero h1,
.talk-title,
.cta-band h2 {
  font-weight: 500;
  letter-spacing: -0.042em;
  line-height: 1.08;
  text-wrap: balance;
}
.split-head h2,
.talk-title,
.cta-band h2 {
  font-size: clamp(2.15rem, 4.2vw, 3.7rem);
  margin-top: 0.85rem;
}
.split-intro,
.section-head p {
  color: var(--text-muted);
  font-size: 1.02rem;
  line-height: 1.6;
}
.range-label { justify-self: end; align-self: end; margin: 0; }

/* Solution cards */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 2vw, 2rem);
}
.solution-visual {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  background: #121316;
  aspect-ratio: 16 / 11;
}
.solution-visual svg { width: 100%; height: 100%; }
.visual-label {
  position: absolute;
  top: 0.85rem;
  left: 0.85rem;
  padding: 0.28rem 0.55rem;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.45);
  color: #f3f3f3;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
}
.solution-kicker {
  margin-top: 1.15rem;
  font-size: 0.82rem;
  color: var(--text-faint);
}
.solution h3 {
  margin-top: 0.4rem;
  font-size: clamp(1.35rem, 1.8vw, 1.7rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.2;
}
.solution p:last-of-type,
.solution .solution-body {
  margin-top: 0.7rem;
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.6;
  max-width: 36rem;
}
.solution .text-link { margin-top: 0.85rem; }

/* Process */
.process {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(1.5rem, 4vw, 4.5rem);
  align-items: start;
}
.step-list { border-top: 1px solid var(--line); }
.step-tab {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  padding: 1.15rem 0.15rem;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  text-align: left;
  cursor: pointer;
  color: var(--text-faint);
}
.step-tab .step-name {
  font-size: clamp(1.15rem, 1.6vw, 1.45rem);
  font-weight: 500;
  letter-spacing: -0.03em;
}
.step-tab .step-no,
.step-tab .step-go {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}
.step-tab.is-selected,
.step-tab[aria-selected="true"] {
  color: var(--text);
}
.step-tab:hover { color: var(--text); }
.step-panel { min-width: 0; }
.process.is-enhanced .step-panel[hidden] { display: none; }
.step-visual {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: center;
  min-height: 180px;
}
.step-corners {
  width: 54px;
  height: 54px;
  border: 1.5px solid #cfcfcf;
  border-right: 0;
  border-bottom: 0;
  justify-self: start;
}
.step-art {
  width: min(100%, 280px);
  justify-self: end;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #121316;
}
.step-art svg { width: 100%; height: auto; aspect-ratio: 16 / 11; }
.step-watermark {
  font-size: clamp(4.5rem, 8vw, 7.5rem);
  font-weight: 500;
  letter-spacing: -0.06em;
  line-height: 0.8;
  color: #ececec;
  justify-self: end;
}
.step-panel h3 {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.03em;
}
.step-panel p {
  margin-top: 0.65rem;
  max-width: 36rem;
  color: var(--text-muted);
  font-size: 1.02rem;
}

/* Insights */
.insight-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line);
}
.insight {
  padding: 1.75rem 0 0.25rem;
  min-width: 0;
}
.insight + .insight {
  padding-left: clamp(1.25rem, 3vw, 3rem);
  border-left: 1px solid var(--line);
}
.insight-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.insight h3 {
  font-size: clamp(1.45rem, 2.2vw, 2rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.2;
  max-width: 16em;
}
.insight h3 a:hover { opacity: 0.7; }
.insight p {
  margin-top: 0.85rem;
  color: var(--text-muted);
  max-width: 34rem;
}
.insight .text-link { margin-top: 1.1rem; }

/* Regions */
.region-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  border-top: 1px solid var(--line);
}
.region-chip {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.35rem 1.25rem 1.35rem 0;
  border-bottom: 1px solid var(--line);
  min-height: 104px;
}
.region-chip:hover { opacity: 1; }
.region-chip strong {
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: -0.03em;
}
.region-chip span {
  font-size: 0.88rem;
  color: var(--text-faint);
  max-width: 24rem;
}

/* Talk */
.talk { border-top: 1px solid var(--line); }
.talk-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: start;
}
.talk-title { white-space: pre-line; }
.talk-lead {
  margin-top: 1.15rem;
  color: var(--text-muted);
  font-size: 1.05rem;
}
.talk-grid .btn { margin-top: 1.75rem; }
.talk-rows { border-top: 1px solid var(--line); }
.talk-row {
  padding: 1.15rem 0 1.2rem;
  border-bottom: 1px solid var(--line);
}
.talk-row-link,
.talk-row-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.talk-value {
  display: block;
  margin-top: 0.35rem;
  font-size: clamp(1.25rem, 2vw, 1.7rem);
  font-weight: 560;
  letter-spacing: -0.03em;
  overflow-wrap: anywhere;
}
.talk-arrow {
  font-size: 1.15rem;
  color: var(--text-faint);
}
.talk-note,
.copy-status {
  margin-top: 0.75rem;
  max-width: var(--measure);
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}
.copy-status:empty { display: none; }

/* Inner pages */
.page-hero {
  padding: clamp(4rem, 8vw, 6.5rem) 0 clamp(2.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--line);
}
.page-hero .container {
  display: grid;
  grid-template-columns: minmax(16rem, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(1.5rem, 4vw, 5rem);
  align-items: end;
}
.page-hero h1 {
  font-size: clamp(2.4rem, 5vw, 4.4rem);
  max-width: 12em;
}
.page-hero p {
  color: var(--text-muted);
  font-size: 1.12rem;
  line-height: 1.6;
  max-width: var(--measure);
}
.prose { max-width: 42rem; }
.prose h2 {
  font-size: clamp(1.6rem, 2vw, 2rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  margin: 2.75rem 0 0.85rem;
}
.prose p { color: var(--text-muted); margin-bottom: 1rem; font-size: 1.05rem; }
.prose ul {
  margin: 0 0 1.25rem;
  padding-left: 1.15rem;
  list-style: disc;
  color: var(--text-muted);
}
.prose li { margin-bottom: 0.5rem; }
.prose strong { color: var(--text); font-weight: 560; }
.grid-2, .grid-3 {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.grid-2.service-grid { margin-bottom: 2.5rem; }
.card {
  background: transparent;
  padding: 1.6rem 1.5rem 1.6rem 0;
  border-bottom: 1px solid var(--line);
}
.grid-2 .card + .card,
.grid-3 .card + .card { padding-left: 1.5rem; }
.card h2, .card h3 {
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.03em;
  margin-bottom: 0.55rem;
}
.card p { color: var(--text-muted); font-size: 0.98rem; max-width: 36rem; }
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1rem;
  font-weight: 500;
}
.region-cta { margin-top: 2.25rem; }

.cta-band {
  padding: clamp(4.5rem, 8vw, 7rem) 0;
  text-align: left;
  border-top: 1px solid var(--line);
}
.cta-band p {
  color: var(--text-muted);
  margin: 1rem 0 1.6rem;
}

/* Form */
.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}
.whatsapp-bar { padding-bottom: 2.5rem; }
.public-contacts { display: grid; gap: 1.5rem; min-width: 0; }
.email-address {
  font-size: clamp(1.05rem, 1.6vw, 1.35rem);
  font-weight: 560;
  letter-spacing: -0.03em;
  text-decoration: underline;
  text-underline-offset: 0.18em;
  overflow-wrap: anywhere;
}
.whatsapp-contact,
.email-contact { min-width: 0; }
.whatsapp-kicker {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.whatsapp-handle {
  margin: 0.3rem 0 0.75rem;
  font-size: clamp(1.35rem, 2vw, 1.8rem);
  font-weight: 560;
  letter-spacing: -0.03em;
}
.whatsapp-note { color: var(--text-muted); font-size: 0.92rem; max-width: var(--measure); }
.form { display: grid; gap: 1.1rem; }
.form fieldset {
  border: 0;
  margin: 0;
  padding: 0;
  min-inline-size: 0;
  display: grid;
  gap: 1.1rem;
}
.form-row { display: grid; gap: 0.4rem; }
.form-row label { font-size: 0.85rem; color: var(--text-muted); }
.form-row input,
.form-row textarea,
.form-row select {
  width: 100%;
  padding: 0.85rem 0.9rem;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  border-radius: 0;
  background: transparent;
}
.form-note { font-size: 0.88rem; color: var(--text-faint); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 3.5rem 0 2rem;
  background: var(--bg);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 2.5rem;
  margin-bottom: 3rem;
}
.footer-brand p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-top: 0.85rem;
  max-width: 22rem;
}
.footer-col h2 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 1rem;
}
.footer-col a {
  display: block;
  font-size: 0.92rem;
  color: #3a3a3a;
  margin-bottom: 0.5rem;
}
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
  color: var(--text-faint);
}
.to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 44px;
  color: var(--text);
  font-weight: 500;
}

.lang-select-mobile { display: none; }
.locale-list {
  display: grid;
  gap: 0.7rem;
  margin: 0 0 1.75rem;
}
.locale-list a { font-weight: 500; }

@media (min-width: 1440px) {
  :root { --gutter: clamp(4.5rem, 6vw, 7.5rem); }
  .section { padding: 8rem 0; }
  .hero { padding-top: 3rem; }
  .hero h1 { font-size: clamp(3.4rem, 4.2vw, 5rem); }
}

@media (max-width: 860px) {
  .nav { display: flex; }
  .nav-links,
  .lang-select-desktop { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav.is-open .nav-links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem var(--gutter) 1.25rem;
    gap: 0.25rem;
  }
  .nav.is-open .nav-links a { min-height: 44px; display: inline-flex; align-items: center; }
  .nav.is-open .lang-select-mobile { display: block; margin: 0.35rem 0 0.5rem; width: 100%; }
  .nav.is-open .lang-select {
    border: 1px solid var(--line-strong);
    min-height: 44px;
    padding: 0.45rem 1.6rem 0.45rem 0.85rem;
    width: min(100%, 16rem);
  }
  .hero-grid,
  .split-head,
  .solution-grid,
  .process,
  .insight-grid,
  .talk-grid,
  .page-hero .container,
  .contact-layout,
  .grid-2,
  .grid-3,
  .platform-row {
    grid-template-columns: 1fr;
  }
  .hero-grid { min-height: 0; }
  .platform-row { display: grid; gap: 0.85rem; }
  .platform-label { max-width: none; }
  .insight + .insight {
    padding-left: 0;
    border-left: 0;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--line);
  }
  .grid-2 .card + .card,
  .grid-3 .card + .card { padding-left: 0; }
  .range-label { justify-self: start; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .step-visual { grid-template-columns: 1fr auto; }
  .step-corners { display: none; }
  .step-art { justify-self: start; width: min(100%, 240px); }
  .orb-caption { letter-spacing: 0.06em; }
}

@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
  .nav-actions .btn { padding: 0.45rem 0.75rem; font-size: 0.78rem; min-height: 40px; }
  .logo { font-size: 0.86rem; }
  .hero h1 { letter-spacing: -0.04em; }
  .hero-actions { gap: 0.25rem 0.85rem; }
  .talk-value { font-size: 1.15rem; }
}

:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 3px;
}
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--text);
  color: var(--bg);
  padding: 0.5rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 1rem; top: 1rem; }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

.form :disabled {
  cursor: not-allowed;
  opacity: 1;
  color: var(--text);
  background: #f6f6f6;
}