:root {
  color-scheme: dark;
  --ink: #07090d;
  --ink-soft: #0c1016;
  --panel: rgba(16, 22, 30, 0.82);
  --panel-solid: #10161e;
  --line: rgba(166, 190, 214, 0.15);
  --line-strong: rgba(166, 190, 214, 0.28);
  --paper: #f4f7fa;
  --muted: #98a4b2;
  --blue: #1598ff;
  --blue-strong: #0878c9;
  --blue-soft: rgba(21, 152, 255, 0.12);
  --max: 1180px;
  --header-height: 88px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--ink);
}

@view-transition {
  navigation: auto;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 76% 13%, rgba(8, 120, 201, 0.13), transparent 26rem),
    var(--ink);
  color: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  content: "";
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, black, transparent 78%);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea {
  font: inherit;
}

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

img,
svg {
  display: block;
  max-width: 100%;
}

::selection {
  background: rgba(21, 152, 255, 0.36);
  color: white;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  background: var(--paper);
  color: var(--ink);
  transform: translateY(-160%);
  transition: transform 180ms ease;
}

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

.shell {
  width: min(calc(100% - 3rem), var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  border-bottom: 1px solid var(--line);
  background: rgba(7, 9, 13, 0.78);
  backdrop-filter: blur(18px) saturate(130%);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
}

.brand img {
  width: 226px;
  height: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.1rem, 2.5vw, 2.3rem);
}

.nav-link {
  position: relative;
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color 220ms ease;
}

.nav-link::after {
  position: absolute;
  right: 0;
  bottom: -0.75rem;
  left: 0;
  height: 1px;
  content: "";
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 320ms var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link[aria-current="page"] {
  color: var(--paper);
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  transform-origin: left;
}

.language-switch {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding-left: 1.2rem;
  border-left: 1px solid var(--line-strong);
}

.language-switch button {
  padding: 0.35rem 0.45rem;
  border: 0;
  background: none;
  color: #697686;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  transition: color 180ms ease;
}

.language-switch button:hover,
.language-switch button:focus-visible,
.language-switch button[aria-pressed="true"] {
  color: var(--blue);
}

.language-separator {
  color: #3e4854;
}

.menu-button {
  display: none;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.02);
  color: var(--paper);
  cursor: pointer;
}

.menu-button span,
.menu-button::before,
.menu-button::after {
  display: block;
  width: 18px;
  height: 1px;
  margin: 5px auto;
  content: "";
  background: currentColor;
  transition: transform 250ms var(--ease), opacity 200ms ease;
}

.menu-button[aria-expanded="true"] span {
  opacity: 0;
}

.menu-button[aria-expanded="true"]::before {
  transform: translateY(6px) rotate(45deg);
}

.menu-button[aria-expanded="true"]::after {
  transform: translateY(-6px) rotate(-45deg);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.4rem;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 30px;
  height: 1px;
  content: "";
  background: currentColor;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  align-items: center;
  min-height: calc(100svh - var(--header-height));
  padding-block: clamp(4.5rem, 9vw, 8rem);
  gap: clamp(2rem, 6vw, 7rem);
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.hero h1,
.page-hero h1 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(3.2rem, 7.2vw, 6.65rem);
  font-weight: 730;
  letter-spacing: -0.065em;
  line-height: 0.96;
  text-wrap: balance;
}

.hero h1 .accent,
.page-hero h1 .accent {
  color: var(--blue);
}

.hero-lead {
  max-width: 610px;
  margin: 2rem 0 0;
  color: #b5bec8;
  font-size: clamp(1.08rem, 1.45vw, 1.3rem);
  line-height: 1.6;
}

.hero-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2.35rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0.8rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 0.88rem;
  font-weight: 720;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  transition: transform 250ms var(--ease), background 250ms ease, border-color 250ms ease, color 250ms ease;
}

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

.button-primary {
  background: var(--blue);
  color: #03111c;
}

.button-primary:hover,
.button-primary:focus-visible {
  background: #49afff;
}

.button-secondary {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.025);
  color: var(--paper);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: rgba(21, 152, 255, 0.55);
  background: var(--blue-soft);
}

.arrow {
  margin-left: 0.7rem;
  font-size: 1.1em;
  transition: transform 250ms var(--ease);
}

.button:hover .arrow,
.text-link:hover .arrow {
  transform: translateX(4px);
}

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 1;
}

.hero-visual::before {
  position: absolute;
  width: 78%;
  aspect-ratio: 1;
  border-radius: 50%;
  content: "";
  background: rgba(8, 120, 201, 0.13);
  filter: blur(80px);
}

.orbit-frame {
  position: relative;
  display: grid;
  place-items: center;
  width: min(100%, 520px);
  aspect-ratio: 1;
}

.orbit-frame::before,
.orbit-frame::after {
  position: absolute;
  content: "";
  background: linear-gradient(90deg, transparent, var(--line-strong) 18%, var(--line-strong) 82%, transparent);
}

.orbit-frame::before {
  top: 50%;
  right: 0;
  left: 0;
  height: 1px;
}

.orbit-frame::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: linear-gradient(transparent, var(--line-strong) 18%, var(--line-strong) 82%, transparent);
}

.orbit-frame > img {
  position: relative;
  z-index: 3;
  width: 82%;
  filter: drop-shadow(0 24px 50px rgba(0, 0, 0, 0.42));
  animation: breathe 7s var(--ease) infinite alternate;
}

.orbit-track {
  position: absolute;
  z-index: 4;
  top: 50%;
  right: 6%;
  left: 6%;
  height: 1px;
}

.orbit-track::before {
  position: absolute;
  top: -4px;
  left: 0;
  width: 8px;
  height: 8px;
  border: 3px solid var(--ink);
  border-radius: 50%;
  content: "";
  background: var(--blue);
  box-shadow: 0 0 24px rgba(21, 152, 255, 0.9);
  animation: signal-travel 5.5s var(--ease) infinite;
}

.axis-label {
  position: absolute;
  z-index: 4;
  color: #73808d;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.axis-label.top {
  top: 1%;
  left: 50%;
  transform: translateX(-50%);
}

.axis-label.right {
  top: 50%;
  right: -1%;
  transform: translateY(-50%) rotate(90deg);
}

.axis-label.bottom {
  bottom: 1%;
  left: 50%;
  transform: translateX(-50%);
}

.signal-strip {
  position: absolute;
  bottom: 1.25rem;
  left: 50%;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  width: min(calc(100% - 3rem), var(--max));
  transform: translateX(-50%);
}

.signal-stage {
  position: relative;
  padding: 0.9rem 0.8rem 0 1.15rem;
  border-top: 1px solid var(--line-strong);
  color: #788593;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.signal-stage::before {
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  content: "";
  background: #4e5965;
}

.signal-stage:first-child::before {
  background: var(--blue);
  box-shadow: 0 0 16px rgba(21, 152, 255, 0.9);
  animation: signal 3.8s ease-in-out infinite;
}

.section {
  padding-block: clamp(5rem, 10vw, 9rem);
  border-top: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(180px, 0.36fr) minmax(0, 0.64fr);
  gap: clamp(2rem, 7vw, 7rem);
  margin-bottom: clamp(3rem, 6vw, 5.5rem);
}

.section-heading h2,
.feature-copy h2,
.cta-panel h2,
.contact-panel h2 {
  margin: 0;
  font-size: clamp(2.2rem, 4.3vw, 4.4rem);
  font-weight: 680;
  letter-spacing: -0.045em;
  line-height: 1.04;
  text-wrap: balance;
}

.section-heading > div > p,
.intro-copy,
.contact-intro {
  max-width: 660px;
  margin: 0;
  color: #a7b2be;
  font-size: clamp(1.08rem, 1.55vw, 1.28rem);
}

.feature-copy h2 {
  margin-bottom: 0.25rem;
}

.feature-copy div > p:first-of-type {
  margin: 0 0 1.8rem;
  color: var(--blue);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.feature-copy div > p:not(:first-of-type) {
  max-width: 660px;
  margin: 0 0 1.2rem;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  min-height: 460px;
  border: 1px solid var(--line-strong);
  background: rgba(10, 14, 20, 0.72);
}

.feature-copy {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(2rem, 5vw, 4.7rem);
}

.feature-visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 420px;
  overflow: hidden;
  border-left: 1px solid var(--line);
  background:
    radial-gradient(circle, rgba(21, 152, 255, 0.16), transparent 47%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.015), transparent 55%);
}

.feature-visual::before,
.feature-visual::after {
  position: absolute;
  content: "";
}

.feature-visual::before {
  right: 9%;
  left: 9%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(21, 152, 255, 0.42), transparent);
}

.feature-visual::after {
  width: 54%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgba(21, 152, 255, 0.1);
  filter: blur(68px);
}

.arc-logo-mark {
  position: relative;
  z-index: 2;
  width: min(88%, 520px);
  filter: drop-shadow(0 18px 38px rgba(0, 0, 0, 0.46));
}

.product-kicker {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 1.5rem;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 14px rgba(21, 152, 255, 0.75);
}

.text-link {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  margin-top: 2rem;
  color: var(--paper);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.card {
  position: relative;
  min-height: 310px;
  padding: clamp(1.7rem, 3.4vw, 3rem);
  background: var(--ink-soft);
  transition: background 320ms ease;
}

.card:hover {
  background: #111923;
}

.card-number {
  display: block;
  margin-bottom: 4.5rem;
  color: var(--blue);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}

.card h3 {
  margin: 0 0 1rem;
  font-size: 1.35rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.cta-panel {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  padding: clamp(2.4rem, 6vw, 5.5rem);
  gap: 3rem;
  overflow: hidden;
  border: 1px solid rgba(21, 152, 255, 0.3);
  background: linear-gradient(110deg, rgba(21, 152, 255, 0.13), rgba(8, 12, 18, 0.65) 62%);
}

.cta-panel::after {
  position: absolute;
  top: -90%;
  right: -8%;
  width: 380px;
  aspect-ratio: 1;
  border: 1px solid rgba(21, 152, 255, 0.24);
  border-radius: 50%;
  content: "";
}

.page-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.68fr) minmax(280px, 0.32fr);
  align-items: end;
  min-height: 68svh;
  padding-block: clamp(5rem, 10vw, 9rem);
  gap: clamp(2rem, 7vw, 7rem);
}

.page-hero h1 {
  max-width: 11ch;
  font-size: clamp(3.4rem, 7vw, 6.2rem);
}

.page-hero-aside {
  padding: 1.5rem 0 0 1.5rem;
  border-top: 1px solid var(--blue);
  color: #a7b2be;
  font-size: 1.08rem;
}

.statement-grid {
  display: grid;
  grid-template-columns: minmax(200px, 0.33fr) minmax(0, 0.67fr);
  gap: clamp(2.5rem, 8vw, 8rem);
}

.statement-grid h2 {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.statement-copy p {
  max-width: 760px;
  margin: 0 0 1.5rem;
  color: #c0c8d1;
  font-size: clamp(1.3rem, 2vw, 1.75rem);
  line-height: 1.5;
}

.principles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.principle {
  min-height: 260px;
  padding: clamp(2rem, 4vw, 3.4rem);
  background: var(--ink-soft);
}

.principle h3 {
  margin: 2.8rem 0 0.8rem;
  font-size: 1.35rem;
  font-weight: 650;
}

.principle p {
  max-width: 480px;
  margin: 0;
  color: var(--muted);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.4rem;
}

.person {
  padding: clamp(2rem, 4vw, 3.5rem);
  border: 1px solid var(--line);
  background: rgba(12, 16, 22, 0.7);
}

.person-mark {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  margin-bottom: 3.2rem;
  border: 1px solid rgba(21, 152, 255, 0.4);
  border-radius: 50%;
  color: var(--blue);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.8rem;
}

.person h3 {
  margin: 0;
  font-size: 1.55rem;
}

.person .role {
  margin: 0.35rem 0 1.4rem;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.person p {
  max-width: 520px;
  margin: 0;
  color: var(--muted);
}

.product-architecture {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  margin-top: 3rem;
  border: 1px solid var(--line);
}

.architecture-step {
  position: relative;
  min-height: 180px;
  padding: 1.5rem;
  border-right: 1px solid var(--line);
  background: rgba(12, 16, 22, 0.68);
}

.architecture-step:last-child {
  border-right: 0;
}

.architecture-step::before {
  display: block;
  width: 7px;
  height: 7px;
  margin-bottom: 4rem;
  border-radius: 50%;
  content: "";
  background: var(--blue);
}

.architecture-step h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-weight: 650;
}

.architecture-step p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.service-list {
  border-top: 1px solid var(--line-strong);
}

.service-row {
  display: grid;
  grid-template-columns: 90px minmax(220px, 0.38fr) minmax(0, 0.62fr);
  padding-block: clamp(2rem, 4vw, 3.2rem);
  gap: 2rem;
  border-bottom: 1px solid var(--line);
}

.service-row .index {
  color: var(--blue);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
}

.service-row h3 {
  margin: 0;
  font-size: clamp(1.3rem, 2.2vw, 1.8rem);
  font-weight: 620;
}

.service-row p {
  max-width: 610px;
  margin: 0;
  color: var(--muted);
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.4fr) minmax(0, 0.6fr);
  min-height: 620px;
  border: 1px solid var(--line-strong);
  background: rgba(10, 14, 20, 0.74);
}

.contact-panel,
.contact-form-wrap {
  padding: clamp(2rem, 5vw, 4.5rem);
}

.contact-panel {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1px solid var(--line);
}

.contact-details {
  display: grid;
  gap: 1.3rem;
  margin-top: 3rem;
}

.contact-detail small {
  display: block;
  margin-bottom: 0.2rem;
  color: #687583;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.contact-detail a:hover,
.contact-detail a:focus-visible {
  color: var(--blue);
}

.contact-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}

.form-field {
  display: grid;
  gap: 0.55rem;
}

.form-field.full {
  grid-column: 1 / -1;
}

.form-field label {
  color: #aab4bf;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.form-field input,
.form-field textarea {
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  border-radius: 0;
  outline: 0;
  background: transparent;
  color: var(--paper);
  font-size: 1rem;
  transition: border-color 180ms ease, background 180ms ease;
}

.form-field input {
  min-height: 52px;
}

.form-field textarea {
  min-height: 150px;
  padding-block: 0.8rem;
  resize: vertical;
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--blue);
  background: rgba(21, 152, 255, 0.035);
}

.form-note {
  grid-column: 1 / -1;
  margin: -0.4rem 0 0;
  color: #6f7b88;
  font-size: 0.82rem;
}

.contact-form .button {
  justify-self: start;
  margin-top: 0.5rem;
  border: 0;
  cursor: pointer;
}

.site-footer {
  padding-block: 3rem;
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 2rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.footer-brand img {
  width: 64px;
}

.footer-brand strong {
  display: block;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-brand span,
.footer-meta {
  color: #6e7a87;
  font-size: 0.78rem;
}

.footer-meta {
  text-align: right;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 800ms var(--ease), transform 800ms var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@keyframes signal-travel {
  0%, 12% { left: 0; transform: translateX(-50%); opacity: 0; }
  20% { opacity: 1; }
  78% { opacity: 1; }
  88%, 100% { left: 100%; transform: translateX(-50%); opacity: 0; }
}

@keyframes breathe {
  from { transform: scale(0.98); }
  to { transform: scale(1.02); }
}

@keyframes signal {
  0%, 100% { transform: scale(0.8); opacity: 0.5; }
  50% { transform: scale(1.25); opacity: 1; }
}

@media (max-width: 980px) {
  :root { --header-height: 76px; }

  .brand img { width: 192px; }
  .menu-button { display: block; }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    left: 0;
    display: grid;
    justify-items: start;
    padding: 2rem max(1.5rem, calc((100vw - var(--max)) / 2));
    gap: 1.4rem;
    border-bottom: 1px solid var(--line-strong);
    background: rgba(7, 9, 13, 0.97);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-12px);
    transition: opacity 220ms ease, transform 300ms var(--ease), visibility 220ms;
  }

  .site-nav.is-open {
    visibility: visible;
    opacity: 1;
    transform: none;
  }

  .nav-link { font-size: 1rem; }
  .nav-link::after { bottom: -0.35rem; }

  .language-switch {
    margin-top: 0.4rem;
    padding: 1rem 0 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-bottom: 9rem;
  }

  .hero-copy { max-width: 760px; }
  .hero-visual { width: min(78vw, 520px); margin: 0 auto; }

  .feature-grid,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .feature-visual {
    min-height: 360px;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .contact-panel { border-right: 0; border-bottom: 1px solid var(--line); }

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

  .architecture-step:nth-child(3) { border-right: 0; }
  .architecture-step:nth-child(n + 4) { border-top: 1px solid var(--line); }

  .cta-panel { grid-template-columns: 1fr; align-items: start; }
}

@media (max-width: 720px) {
  .shell { width: min(calc(100% - 2rem), var(--max)); }
  .brand img { width: 174px; }

  .hero {
    min-height: auto;
    padding-top: 5rem;
  }

  .hero h1,
  .page-hero h1 {
    font-size: clamp(3rem, 14vw, 4.6rem);
  }

  .hero-visual { width: min(92vw, 450px); }
  .axis-label.right { right: -3%; }

  .signal-strip {
    grid-template-columns: repeat(2, 1fr);
    bottom: 1.2rem;
  }

  .signal-stage:nth-child(n + 3) { display: none; }

  .section-heading,
  .page-hero,
  .statement-grid {
    grid-template-columns: 1fr;
  }

  .page-hero {
    min-height: auto;
    padding-top: 5rem;
  }

  .cards,
  .principles,
  .team-grid {
    grid-template-columns: 1fr;
  }

  .card { min-height: 270px; }
  .card-number { margin-bottom: 3.5rem; }

  .product-architecture { grid-template-columns: 1fr; }
  .architecture-step,
  .architecture-step:nth-child(3) {
    min-height: 150px;
    border-top: 1px solid var(--line);
    border-right: 0;
  }
  .architecture-step:first-child { border-top: 0; }
  .architecture-step::before { margin-bottom: 2rem; }

  .service-row {
    grid-template-columns: 54px 1fr;
  }
  .service-row p { grid-column: 2; }

  .contact-form { grid-template-columns: 1fr; }
  .form-field.full,
  .form-note { grid-column: auto; }

  .footer-inner { grid-template-columns: 1fr; }
  .footer-meta { text-align: left; }
}

@media (max-width: 450px) {
  .brand img { width: 154px; }
  .menu-button { width: 42px; height: 42px; }
  .hero-actions .button,
  .cta-actions .button { width: 100%; }
  .feature-copy { min-height: 420px; }
  .arc-logo-mark { width: min(86%, 430px); }
  .service-row { grid-template-columns: 1fr; gap: 0.6rem; }
  .service-row p { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}