* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--ds-font-sans);
  background: var(--ds-bg);
  color: var(--ds-foreground);
  min-height: 100vh;
}

.noise,
.halo {
  display: none;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

.topbar {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 20px 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--ds-border);
}

.brand {
  flex-shrink: 0;
}

.brand img {
  width: 176px;
  display: block;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

nav a {
  position: relative;
  text-decoration: none;
  color: var(--ds-muted);
  font-size: 14px;
  font-weight: 600;
  padding: 4px 0;
}

nav a:hover,
nav a.active {
  color: var(--ds-foreground);
}

nav a:hover::after,
nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -17px;
  height: 2px;
  background: var(--ds-action);
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: 16px;
  border-left: 1px solid var(--ds-border);
}

.lang-btn {
  border: none;
  background: none;
  color: var(--ds-muted);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 0;
  cursor: pointer;
}

.lang-btn:hover,
.lang-btn[aria-pressed="true"] {
  color: var(--ds-foreground);
}

main {
  width: min(1120px, calc(100% - 2rem));
  margin: 40px auto 80px;
}

section + section {
  margin-top: 56px;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--ds-foreground);
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 4.2vw, 4.2rem);
  line-height: 1.04;
}

h2 {
  font-size: clamp(1.5rem, 2.3vw, 2.1rem);
  line-height: 1.15;
}

h3 {
  font-size: 1rem;
  line-height: 1.35;
}

.lead {
  margin: 0;
  max-width: 760px;
  color: var(--ds-muted);
  font-size: 1rem;
  line-height: 1.75;
}

.hero,
.principles,
.cases,
.flow,
.contact {
  background: var(--ds-surface);
  border: 1px solid var(--ds-border);
  border-radius: 12px;
  box-shadow: var(--ds-shadow-sm);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px 48px;
  align-items: start;
  padding: 40px;
}

.hero h1,
.hero .lead,
.hero .hero-actions {
  grid-column: 1;
}

.hero-metrics {
  grid-column: 2;
  grid-row: 1 / span 3;
  display: grid;
  gap: 18px;
  align-content: start;
  padding-left: 24px;
  border-left: 1px solid var(--ds-border);
}

.hero-metrics article {
  padding-top: 18px;
  border-top: 1px solid var(--ds-border);
}

.hero-metrics article:first-child {
  padding-top: 0;
  border-top: none;
}

.hero-metrics strong {
  display: block;
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--ds-foreground);
}

.hero-metrics span {
  display: block;
  margin-top: 6px;
  color: var(--ds-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--ds-border-strong);
  border-radius: 8px;
  background: var(--ds-surface);
  color: var(--ds-foreground);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: border-color 140ms ease, background-color 140ms ease, color 140ms ease;
}

.btn:hover {
  border-color: var(--ds-action);
}

.btn-primary {
  border-color: var(--ds-action);
  background: var(--ds-action);
  color: var(--ds-action-foreground);
}

.btn-primary:hover {
  border-color: var(--ds-action-hover);
  background: var(--ds-action-hover);
  color: var(--ds-action-foreground);
}

.btn-subtle,
.btn-ghost,
.btn-soft {
  background: var(--ds-surface);
}

.principles,
.cases,
.flow,
.contact {
  padding: 32px;
}

.section-head {
  margin-bottom: 24px;
}

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

.principle-grid article {
  padding: 18px;
  border: 1px solid var(--ds-border);
  border-radius: 10px;
  background: var(--ds-surface-alt);
}

.principle-grid p {
  margin: 8px 0 0;
  color: var(--ds-muted);
  font-size: 0.94rem;
  line-height: 1.7;
}

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

.case-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  background: var(--ds-surface);
  border: 1px solid var(--ds-border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--ds-shadow-sm);
}

.case-card:hover {
  border-color: var(--ds-border-strong);
  box-shadow: var(--ds-shadow-md);
}

.case-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
  border-bottom: 1px solid var(--ds-border);
}

.case-card img.is-illustration {
  object-fit: contain;
  padding: 20px;
  background: var(--ds-surface-alt);
}

.case-card div {
  padding: 16px;
}

.case-card p {
  margin: 8px 0 0;
  color: var(--ds-muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

.flow ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.flow li {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 24px;
  padding: 16px 0;
  border-top: 1px solid var(--ds-border);
}

.flow li:first-child {
  padding-top: 0;
  border-top: none;
}

.flow li strong {
  font-size: 0.96rem;
}

.flow li span {
  color: var(--ds-muted);
  line-height: 1.7;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: end;
}

.contact p {
  margin: 0;
  max-width: 720px;
  color: var(--ds-muted);
  line-height: 1.75;
}

footer {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto 40px;
  padding-top: 16px;
  border-top: 1px solid var(--ds-border);
  color: var(--ds-muted);
  font-size: 13px;
}

@media (max-width: 960px) {
  .topbar,
  main,
  footer {
    width: min(1120px, calc(100% - 1.5rem));
  }

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

  .topbar-actions {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  nav {
    flex-wrap: wrap;
    gap: 16px;
  }

  .lang-switch {
    padding-left: 0;
    border-left: none;
  }

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

  .hero-metrics {
    grid-column: 1;
    grid-row: auto;
    padding-left: 0;
    padding-top: 8px;
    border-left: none;
    border-top: 1px solid var(--ds-border);
  }

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

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

@media (max-width: 640px) {
  main {
    margin: 24px auto 64px;
  }

  .hero,
  .principles,
  .cases,
  .flow,
  .contact {
    padding: 24px;
  }

  .principle-grid,
  .case-grid {
    grid-template-columns: 1fr;
  }

  .flow li {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}