/* Light theme */
:root {
  color-scheme: light;
  --background: #fdfcf9;
  --surface: #ffffff;
  --text: #18181c;
  --text-secondary: #62626b;
  --border: #e4e3df;
  --border-strong: #bebdc4;
  --accent: #4f46e5;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 150ms ease;
}

a:hover { color: var(--accent); }

.container {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 10px;
  left: 10px;
  padding: 7px 11px;
  border: 1px solid var(--accent);
  background: var(--surface);
  color: var(--text);
  transform: translateY(-160%);
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Header */
.site-header {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 24px;
  border-bottom: 1px solid var(--border);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 25px;
  font-size: 14px;
  font-weight: 520;
}

/* Introduction */
.intro {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 64px;
  align-items: center;
  padding: 38px 0;
}

.identity {
  display: flex;
  align-items: center;
  gap: 27px;
}

.portrait {
  flex: 0 0 auto;
  width: 128px;
  height: 128px;
  border: 1px solid var(--border);
  border-radius: 3px;
  object-fit: cover;
  background: #f1f0eb;
}

.identity h1 {
  margin: 0;
  font-size: clamp(38px, 4vw, 50px);
  line-height: 1;
  letter-spacing: -0.045em;
  font-weight: 730;
}

.accent-line {
  display: block;
  width: 35px;
  height: 3px;
  margin: 16px 0 12px;
  background: var(--accent);
}

.identity-copy p {
  max-width: 380px;
  margin: 0;
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.5;
}

.intro-about {
  padding-left: 42px;
  border-left: 1px solid var(--border);
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 12px;
  line-height: 1.2;
  font-weight: 750;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.intro-about > .eyebrow { margin-bottom: 13px; }
.about-copy {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.5;
}
.about-copy p { margin: 0 0 8px; }

.text-link {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 560;
}

.text-link span,
.arrow {
  display: inline-block;
  transition: transform 150ms ease;
}

.text-link:hover span { transform: translateX(3px); }
.section-link { display: inline-block; margin-top: 5px; }

/* Shared sections */
.section,
.writing-section {
  padding: 26px 0 35px;
  border-top: 1px solid var(--border);
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
}

/* Products */
.product-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.product-card {
  min-height: 145px;
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr) auto;
  align-items: center;
  gap: 19px;
  padding: 21px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface);
  transition: border-color 150ms ease, transform 150ms ease, color 150ms ease;
}

.product-card:hover {
  border-color: var(--border-strong);
  color: var(--text);
  transform: translateY(-2px);
}

.product-card:hover .arrow,
.article-row:hover .arrow {
  color: var(--accent);
  transform: translateX(3px);
}

.product-icon {
  width: 68px;
  height: 68px;
  border-radius: 13px;
}

.product-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.product-title {
  margin-bottom: 4px;
  font-size: 23px;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.product-description {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.48;
}

.product-card > .arrow { margin-left: 4px; font-size: 19px; }
.platforms { display: flex; gap: 6px; margin-top: 10px; }
.platform {
  padding: 1px 6px 2px;
  border: 1px solid var(--border);
  border-radius: 99px;
  color: var(--text-secondary);
  font-size: 10px;
  line-height: 1.45;
  font-weight: 650;
  letter-spacing: 0.03em;
}

/* Writing */
.writing-section { padding-bottom: 40px; }
.article-list { border-top: 1px solid var(--border); }
.article-row {
  display: grid;
  grid-template-columns: 135px minmax(0, 1fr) auto;
  align-items: center;
  gap: 22px;
  min-height: 58px;
  border-bottom: 1px solid var(--border);
  font-size: 15px;
}

.article-row time {
  color: var(--text-secondary);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
.article-row .arrow { color: var(--text-secondary); }

/* Footer */
.site-footer {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 13px;
}
.site-footer p { margin: 0; }
.site-footer nav { display: flex; gap: 23px; }

/* Responsive */
@media (max-width: 820px) {
  .site-header { align-items: flex-start; padding: 19px 0; }
  .site-nav { justify-content: flex-end; flex-wrap: wrap; row-gap: 10px; gap: 10px 19px; }
  .intro { grid-template-columns: 1fr 0.9fr; gap: 36px; }
  .intro-about { padding-left: 30px; }
  .identity { gap: 20px; }
  .portrait { width: 108px; height: 108px; }
  .identity h1 { font-size: 40px; }
  .product-card { grid-template-columns: 58px minmax(0, 1fr) auto; gap: 15px; padding: 18px; }
  .product-icon { width: 58px; height: 58px; border-radius: 11px; }
}

@media (max-width: 680px) {
  .container { width: min(100% - 32px, 1120px); }
  .site-header { min-height: auto; flex-direction: column; gap: 14px; }
  .site-nav { width: 100%; justify-content: flex-start; gap: 9px 18px; }
  .site-nav a:nth-of-type(3),
  .site-nav a:nth-of-type(4) { display: none; }
  .intro { grid-template-columns: 1fr; gap: 29px; padding: 32px 0; }
  .intro-about { padding: 27px 0 0; border-top: 1px solid var(--border); border-left: 0; }
  .product-grid { grid-template-columns: 1fr; }
  .site-footer { padding: 21px 0; align-items: flex-start; flex-direction: column; gap: 11px; }
  .site-footer nav { flex-wrap: wrap; gap: 9px 20px; }
}

@media (max-width: 420px) {
  .identity { align-items: flex-start; gap: 17px; }
  .portrait { width: 88px; height: 88px; }
  .identity h1 { font-size: 34px; }
  .identity-copy p { font-size: 15px; }
  .accent-line { margin: 12px 0 9px; }
  .product-card { grid-template-columns: 52px minmax(0, 1fr) auto; align-items: start; gap: 13px; }
  .product-icon { width: 52px; height: 52px; border-radius: 10px; }
  .product-title { font-size: 21px; }
  .section-heading { align-items: flex-start; }
  .writing-section .section-heading { flex-direction: column; gap: 8px; }
  .article-row { grid-template-columns: 1fr auto; gap: 5px 12px; padding: 10px 0; }
  .article-row time { grid-column: 1; }
  .article-row > span:not(.arrow) { grid-column: 1; }
  .article-row .arrow { grid-column: 2; grid-row: 1 / span 2; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}