:root {
  color-scheme: light;

  --radius: 16px;
  --radius-sm: 12px;
  --container: 1120px;

  /* Light mode palette (provided) */
  --brand-ink: #2b6777;
  --brand-mist: #c8d8e4;
  --brand-white: #ffffff;
  --brand-snow: #f2f2f2;
  --brand-mint: #52ab98;

  /* Theme tokens — Light defaults */
  --bg: var(--brand-white);
  --bg2: var(--brand-snow);

  --surface: var(--brand-white);
  --surface-2: rgba(43, 103, 119, 0.04);

  --fill: rgba(43, 103, 119, 0.06);
  --fill-hover: rgba(43, 103, 119, 0.10);
  --fill-strong: rgba(43, 103, 119, 0.14);

  --border-subtle: rgba(200, 216, 228, 0.55);
  --border: rgba(200, 216, 228, 0.78);
  --border-strong: var(--brand-mist);

  --text: var(--brand-ink);
  --text-soft: rgba(43, 103, 119, 0.92);
  --muted: rgba(43, 103, 119, 0.72);

  --accent: var(--brand-mint);
  --accent-2: var(--brand-ink);
  --accent-rgb: 82, 171, 152;
  --accent-2-rgb: 43, 103, 119;

  --danger: #ff5b6e;
  --success: #35d39b;

  --page-glow-1: rgba(43, 103, 119, 0.14);
  --page-glow-2: rgba(82, 171, 152, 0.16);

  --header-bg: rgba(255, 255, 255, 0.78);
  --footer-bg: rgba(43, 103, 119, 0.03);
  --section-alt-bg: rgba(43, 103, 119, 0.03);

  --code-surface: rgba(43, 103, 119, 0.06);
  --input-bg: rgba(255, 255, 255, 0.92);

  --focus-ring: rgba(82, 171, 152, 0.55);

  --shadow: 0 18px 55px rgba(43, 103, 119, 0.16);
  --shadow-soft: 0 14px 30px rgba(43, 103, 119, 0.12);
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --bg: #0b1220;
  --bg2: #0b1730;

  --surface: rgba(255, 255, 255, 0.06);
  --surface-2: rgba(255, 255, 255, 0.09);

  --fill: rgba(255, 255, 255, 0.04);
  --fill-hover: rgba(255, 255, 255, 0.07);
  --fill-strong: rgba(0, 0, 0, 0.22);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.16);

  --text: #e8eef9;
  --text-soft: rgba(232, 238, 249, 0.92);
  --muted: #a7b3c6;

  --page-glow-1: rgba(43, 103, 119, 0.35);
  --page-glow-2: rgba(82, 171, 152, 0.22);

  --header-bg: rgba(11, 18, 32, 0.62);
  --footer-bg: rgba(0, 0, 0, 0.18);
  --section-alt-bg: rgba(255, 255, 255, 0.02);

  --code-surface: rgba(0, 0, 0, 0.22);
  --input-bg: rgba(0, 0, 0, 0.22);

  --shadow: 0 18px 55px rgba(0, 0, 0, 0.45);
  --shadow-soft: 0 14px 30px rgba(0, 0, 0, 0.28);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;

    --bg: #0b1220;
    --bg2: #0b1730;

    --surface: rgba(255, 255, 255, 0.06);
    --surface-2: rgba(255, 255, 255, 0.09);

    --fill: rgba(255, 255, 255, 0.04);
    --fill-hover: rgba(255, 255, 255, 0.07);
    --fill-strong: rgba(0, 0, 0, 0.22);

    --border-subtle: rgba(255, 255, 255, 0.08);
    --border: rgba(255, 255, 255, 0.12);
    --border-strong: rgba(255, 255, 255, 0.16);

    --text: #e8eef9;
    --text-soft: rgba(232, 238, 249, 0.92);
    --muted: #a7b3c6;

    --page-glow-1: rgba(43, 103, 119, 0.35);
    --page-glow-2: rgba(82, 171, 152, 0.22);

    --header-bg: rgba(11, 18, 32, 0.62);
    --footer-bg: rgba(0,  0,  0,  0.18);
    --section-alt-bg: rgba(255, 255, 255, 0.02);

    --code-surface: rgba(0, 0, 0, 0.22);
    --input-bg: rgba(0, 0, 0, 0.22);

    --shadow: 0 18px 55px rgba(0, 0, 0, 0.45);
    --shadow-soft: 0 14px 30px rgba(0, 0, 0, 0.28);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji",
    "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 600px at 30% -10%, var(--page-glow-1), transparent 55%),
    radial-gradient(900px 500px at 90% 10%, var(--page-glow-2), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  min-height: 100vh;
}

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

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

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 0.92rem;
}

.skip-link {
  position: absolute;
  left: 14px;
  top: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.72);
  border: 1px solid var(--border);
  transform: translateY(-150%);
  transition: transform 120ms ease;
  z-index: 1000;
}

.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid rgba(var(--accent-rgb), 0.72);
  outline-offset: 2px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--header-bg);
  backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 14px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 160px;
}

.brand-mark {
  filter: drop-shadow(0 10px 18px rgba(0, 0, 0, 0.35));
}

.brand-name {
  font-weight: 740;
  letter-spacing: 0.2px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: auto;
}

.nav-link {
  color: var(--text-soft);
  font-weight: 560;
  padding: 9px 10px;
  border-radius: 10px;
  white-space: nowrap;
  transition: background 120ms ease, color 120ms ease;
}

.nav-link:hover {
  background: var(--fill);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 14px;
  border-radius: 12px;
  border: 1px solid transparent;
  font-weight: 650;
  letter-spacing: 0.2px;
  cursor: pointer;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, rgba(var(--accent-2-rgb), 0.95), rgba(var(--accent-rgb), 0.85));
  border-color: rgba(var(--accent-2-rgb), 0.35);
  box-shadow: 0 16px 40px rgba(var(--accent-2-rgb), 0.14);
  color: #ffffff;
}

.btn-primary:hover {
  filter: brightness(1.05);
}

.btn-ghost {
  background: var(--fill);
  border-color: var(--border);
}

.btn-ghost:hover {
  background: var(--fill-hover);
}

.header-cta {
  display: inline-flex;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--fill);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px;
  cursor: pointer;
}

.lang-pill {
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.92rem;
  color: var(--text-soft);
  font-weight: 650;
}

.lang-pill[aria-current="true"] {
  background: rgba(var(--accent-2-rgb), 0.12);
  border: 1px solid rgba(var(--accent-2-rgb), 0.22);
  color: var(--text);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: var(--fill);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-soft);
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, transform 120ms ease;
}

.theme-toggle:hover {
  background: var(--fill-hover);
  border-color: var(--border-strong);
}

.theme-toggle:active {
  transform: translateY(1px);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.theme-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.theme-icon-moon {
  display: none;
}

.theme-toggle[data-theme-state="dark"] .theme-icon-sun {
  display: none;
}

.theme-toggle[data-theme-state="dark"] .theme-icon-moon {
  display: inline-flex;
}

.hero {
  padding: 180px 0 120px 0;
}

.hero-inner {
  display: grid;
  gap: 24px;
  text-align: center;
  justify-items: center;
  max-width: 980px;
  margin: 0 auto;
}

.kicker {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--fill);
  color: var(--text-soft);
  font-weight: 650;
}

.hero-title {
  font-size: clamp(2.6rem, 4.2vw + 1rem, 4.2rem);
  line-height: 1.03;
  margin: 0;
  letter-spacing: -0.5px;
  font-weight: 860;
  display: grid;
  gap: 6px;
}

.hero-title-line {
  display: block;
}

.hero-title-line-sm {
  font-size: clamp(1.6rem, 2.2vw + 0.8rem, 2.4rem);
  font-weight: 820;
  color: var(--text-soft);
}

.hero-title-accent {
  display: block;
  background: linear-gradient(90deg, rgba(var(--accent-2-rgb), 0.95), rgba(var(--accent-rgb), 0.92));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-subtitle {
  margin: 0;
  color: var(--text-soft);
  font-size: 1.08rem;
  line-height: 1.6;
  max-width: 62ch;
}

.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 6px;
  justify-content: center;
}

.hero-divider {
  width: 100%;
  max-width: 760px;
  height: 1px;
  background: var(--border-subtle);
  margin-top: 22px;
}

.hero-logos {
  list-style: none;
  padding: 0;
  margin: 18px 0 0 0;
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
  justify-content: center;
  opacity: 1;
}

.logo-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 12px;
  border-radius: 14px;
  transition: background 160ms ease, transform 160ms ease;
}

.logo-img {
  display: block;
  height: 28px;
  width: auto;
  opacity: 0.55;
  transition: opacity 180ms ease, filter 180ms ease, transform 180ms ease;
  filter: grayscale(1) brightness(1.1);
}

@media (hover: hover) {
  .hero-logos:hover .logo-img {
    opacity: 0.26;
  }

  .logo-item:hover {
    background: var(--fill);
    transform: translateY(-1px);
  }

  .logo-item:hover .logo-img {
    opacity: 1;
    filter: grayscale(0) brightness(1.25) drop-shadow(0 0 16px rgba(var(--accent-rgb), 0.55));
    transform: translateY(-1px);
  }
}

.hero-bullets {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 18px 0 0 0;
  list-style: none;
  max-width: 720px;
}

.hero-bullets li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--fill);
}

.hero-bullets li::before {
  content: "";
  width: 10px;
  height: 10px;
  margin-top: 6px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, var(--accent), var(--accent-2));
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.16);
  flex: 0 0 auto;
}

.section {
  padding: 64px 0;
}

.section-alt {
  background: var(--section-alt-bg);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  display: grid;
  gap: 10px;
  margin-bottom: 22px;
}

.section-header.center {
  text-align: center;
  justify-items: center;
}

.section-header h2 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: -0.2px;
}

.section-lead {
  margin: 0;
  color: var(--muted);
  max-width: 78ch;
  line-height: 1.6;
}

.grid {
  display: grid;
  gap: 14px;
}

.cards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.expertise-cards {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.projects-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.approach-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.depth-cards {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.kb-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.engineering-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.pillars {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.pillar h3 {
  margin: 0 0 8px 0;
  font-size: 1.05rem;
}

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

.expertise-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.about-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px;
  box-shadow: 0 1px 0 rgba(var(--accent-2-rgb), 0.03);
}

.card:hover {
  border-color: var(--border-strong);
}

.card h3 {
  margin: 0 0 8px 0;
  font-size: 1.1rem;
}

.card p {
  margin: 0 0 12px 0;
  color: var(--text-soft);
  line-height: 1.6;
}

.card-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.6;
}

.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-soft);
}

.icon svg {
  display: block;
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: var(--fill);
  box-shadow: var(--shadow-soft);
  margin-bottom: 6px;
}

.expertise-card {
  padding: 22px;
  display: grid;
  align-content: start;
  --card-accent: rgba(var(--accent-rgb), 0.95);
}

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

.expertise-card--purple {
  --card-accent: rgba(162, 85, 255, 0.95);
}

.expertise-card--purple .card-icon {
  background: linear-gradient(135deg, rgba(162, 85, 255, 0.35), rgba(47, 136, 255, 0.12));
}

.expertise-card--blue {
  --card-accent: rgba(47, 136, 255, 0.95);
}

.expertise-card--blue .card-icon {
  background: linear-gradient(135deg, rgba(47, 136, 255, 0.35), rgba(47, 136, 255, 0.12));
}

.expertise-card--green {
  --card-accent: rgba(77, 228, 194, 0.9);
}

.expertise-card--green .card-icon {
  background: linear-gradient(135deg, rgba(77, 228, 194, 0.28), rgba(47, 136, 255, 0.08));
}

.expertise-card--orange {
  --card-accent: rgba(255, 153, 60, 0.95);
}

.expertise-card--orange .card-icon {
  background: linear-gradient(135deg, rgba(255, 153, 60, 0.28), rgba(255, 91, 110, 0.12));
}

.checklist {
  list-style: none;
  padding: 0;
  margin: 14px 0 0 0;
  display: grid;
  gap: 10px;
  color: var(--muted);
  line-height: 1.5;
}

.checklist li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.checklist li::before {
  content: "✓";
  font-weight: 900;
  color: var(--card-accent, rgba(77, 228, 194, 0.9));
  margin-top: 1px;
}

.card-link {
  margin-top: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--card-accent, rgba(47, 136, 255, 0.92));
}

.card-link:hover {
  text-decoration: underline;
}

.approach-card {
  padding: 22px;
}

.step-kicker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 28px;
  border-radius: 999px;
  border: 1px solid rgba(var(--accent-2-rgb), 0.20);
  background: linear-gradient(135deg, rgba(var(--accent-2-rgb), 0.65), rgba(var(--accent-rgb), 0.55));
  box-shadow: var(--shadow-soft);
  font-size: 0.85rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: #ffffff;
  margin-bottom: 10px;
}

.depth-split {
  display: grid;
  grid-template-columns: 1.05fr 1.35fr;
  gap: 18px;
  align-items: start;
}

.depth-left .section-header {
  margin-bottom: 18px;
}

.depth-card {
  padding: 16px 16px;
  background: var(--fill);
}

.depth-icon {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: var(--code-surface);
  margin-bottom: 10px;
}

.depth-card h3 {
  margin: 0 0 6px 0;
  font-size: 1.04rem;
}

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

.code-card {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--code-surface);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.code-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--fill);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  display: inline-block;
  opacity: 0.9;
}

.dot-red {
  background: #ff5b6e;
}

.dot-yellow {
  background: #ffcc4d;
}

.dot-green {
  background: #35d39b;
}

.code-bar-title {
  margin-left: 10px;
  color: var(--muted);
  font-weight: 650;
  font-size: 0.92rem;
}

.code-pre {
  margin: 0;
  padding: 16px 18px 18px 18px;
  overflow: auto;
}

.code-pre code {
  display: block;
  white-space: pre;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-soft);
}

.kb-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

.kb-kicker::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, rgba(47, 136, 255, 1), rgba(162, 85, 255, 1));
  box-shadow: 0 0 0 4px rgba(162, 85, 255, 0.12);
}

.kb-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.kb-title {
  margin: 0;
  font-size: 2.2rem;
  letter-spacing: -0.3px;
}

.kb-cta {
  font-weight: 750;
  color: var(--text-soft);
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--fill);
  white-space: nowrap;
}

.kb-cta:hover {
  background: var(--fill-hover);
}

.kb-card {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
}

.kb-card-top {
  height: 86px;
  display: flex;
  align-items: center;
  padding: 14px 16px;
}

.kb-card-top .icon {
  opacity: 0.25;
  transform: scale(1.65);
  color: rgba(255, 255, 255, 0.95);
}

.kb-card-body {
  padding: 14px 16px 16px 16px;
}

.kb-tag {
  font-size: 0.82rem;
  font-weight: 780;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

.kb-card-title {
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.35;
  color: var(--text);
}

.kb-card--purple .kb-card-top {
  background: linear-gradient(135deg, rgba(162, 85, 255, 0.85), rgba(47, 136, 255, 0.65));
}

.kb-card--blue .kb-card-top {
  background: linear-gradient(135deg, rgba(47, 136, 255, 0.9), rgba(47, 136, 255, 0.5));
}

.kb-card--green .kb-card-top {
  background: linear-gradient(135deg, rgba(77, 228, 194, 0.75), rgba(47, 136, 255, 0.45));
}

.kb-card--orange .kb-card-top {
  background: linear-gradient(135deg, rgba(255, 153, 60, 0.95), rgba(255, 91, 110, 0.55));
}

.kb-card-link {
  display: block;
  color: inherit;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

.kb-card-link:hover {
  transform: translateY(-1px);
  border-color: var(--border-strong);
}

.kb-page-title {
  margin: 0;
  font-size: clamp(2.2rem, 2.8vw + 1rem, 3rem);
  letter-spacing: -0.4px;
}

.kb-hero {
  padding: 42px 0 44px 0;
  background: radial-gradient(900px 420px at 25% -20%, rgba(47, 136, 255, 0.35), transparent 55%),
    radial-gradient(700px 420px at 85% 10%, rgba(162, 85, 255, 0.24), transparent 55%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0));
  border-bottom: 1px solid var(--border-subtle);
}

.kb-hero[data-variant="purple"] {
  background: radial-gradient(900px 420px at 25% -20%, rgba(162, 85, 255, 0.42), transparent 55%),
    radial-gradient(700px 420px at 85% 10%, rgba(47, 136, 255, 0.22), transparent 55%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0));
}

.kb-hero[data-variant="green"] {
  background: radial-gradient(900px 420px at 25% -20%, rgba(77, 228, 194, 0.32), transparent 55%),
    radial-gradient(700px 420px at 85% 10%, rgba(47, 136, 255, 0.18), transparent 55%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0));
}

.kb-hero[data-variant="orange"] {
  background: radial-gradient(900px 420px at 25% -20%, rgba(255, 153, 60, 0.34), transparent 55%),
    radial-gradient(700px 420px at 85% 10%, rgba(255, 91, 110, 0.16), transparent 55%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0));
}

.kb-hero-inner {
  display: grid;
  gap: 12px;
  align-items: start;
}

.kb-breadcrumbs {
  font-size: 0.92rem;
  color: var(--muted);
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.kb-breadcrumbs a {
  color: var(--text-soft);
}

.kb-breadcrumbs a:hover {
  text-decoration: underline;
}

.kb-meta-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.kb-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--fill);
  font-weight: 750;
  font-size: 0.88rem;
  color: var(--text-soft);
}

.kb-meta {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.kb-meta .dot {
  width: 5px;
  height: 5px;
  border-radius: 999px;
  background: var(--border);
}

.kb-hero-title {
  margin: 2px 0 0 0;
  font-size: clamp(2.2rem, 3.4vw + 1rem, 3.4rem);
  letter-spacing: -0.5px;
  line-height: 1.06;
}

.kb-hero-subtitle {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.7;
  max-width: 80ch;
  font-size: 1.06rem;
}

.kb-article-layout {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.kb-toc {
  position: sticky;
  top: 92px;
  padding: 18px;
}

.kb-toc-title {
  margin: 0 0 12px 0;
  font-size: 1rem;
  letter-spacing: -0.2px;
}

.kb-toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.kb-toc-link {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 10px;
  align-items: baseline;
  padding: 10px 10px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--fill);
  color: var(--text-soft);
  transition: background 120ms ease, border-color 120ms ease;
}

.kb-toc-link:hover {
  background: var(--fill-hover);
  border-color: var(--border-strong);
}

.kb-toc-link[aria-current="true"] {
  background: rgba(var(--accent-rgb), 0.12);
  border-color: rgba(var(--accent-rgb), 0.28);
}

.kb-toc-num {
  width: 22px;
  height: 22px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 0.82rem;
  background: var(--fill-strong);
  border: 1px solid var(--border);
  color: var(--text);
}

.kb-article-page {
  padding: 22px;
}

.kb-section {
  padding: 16px 0;
  border-top: 1px solid var(--border-subtle);
}

.kb-section:first-child {
  border-top: none;
  padding-top: 0;
}

.kb-section-head {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  align-items: start;
  margin-bottom: 10px;
}

.kb-section-number {
  width: 28px;
  height: 28px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 950;
  font-size: 0.92rem;
  background: rgba(var(--accent-rgb), 0.14);
  border: 1px solid rgba(var(--accent-rgb), 0.28);
  color: var(--text);
}

.kb-section h2 {
  margin: 0;
  font-size: 1.4rem;
  letter-spacing: -0.25px;
}

.kb-section p {
  margin: 10px 0 0 0;
  color: var(--text-soft);
  line-height: 1.75;
  max-width: 92ch;
}

@media (max-width: 980px) {
  .kb-article-layout {
    grid-template-columns: 1fr;
  }

  .kb-toc {
    position: static;
    top: auto;
  }
}

.kb-articles {
  display: grid;
  gap: 16px;
}

.kb-article {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 22px;
}

.kb-article-head {
  display: grid;
  gap: 10px;
  margin-bottom: 12px;
}

.kb-article-title {
  margin: 0;
  font-size: 1.6rem;
  letter-spacing: -0.25px;
}

.kb-article-summary {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
  max-width: 90ch;
}

.kb-article h3 {
  margin: 16px 0 8px 0;
  font-size: 1.08rem;
  letter-spacing: -0.1px;
}

.kb-article p {
  margin: 0 0 10px 0;
  color: var(--text-soft);
  line-height: 1.75;
  max-width: 90ch;
}

.kb-list {
  margin: 0 0 10px 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.7;
  max-width: 90ch;
}

.kb-code {
  margin: 12px 0 10px 0;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--code-surface);
  overflow: auto;
}

.kb-code code {
  display: block;
  white-space: pre;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-soft);
}

.kb-backtop {
  position: absolute;
  right: 14px;
  top: 14px;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--fill);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-soft);
}

.kb-backtop:hover {
  background: var(--fill-hover);
}

.eng-card {
  padding: 26px 22px;
  text-align: center;
}

.eng-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: var(--fill);
  box-shadow: var(--shadow-soft);
  margin: 0 auto 12px auto;
}

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

.tags {
  list-style: none;
  padding: 0;
  margin: 10px 0 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 7px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--fill);
  color: var(--text-soft);
  font-weight: 620;
  font-size: 0.92rem;
}

.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.step {
  border: 1px solid var(--border);
  background: var(--fill);
  border-radius: var(--radius);
  padding: 16px 16px;
}

.step h3 {
  margin: 0 0 6px 0;
  letter-spacing: -0.1px;
}

.step p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.contact-split {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 18px;
  align-items: start;
}

.contact-left {
  padding-top: 6px;
}

.contact-title {
  margin: 0 0 10px 0;
  font-size: 2.2rem;
  letter-spacing: -0.3px;
}

.form-compact {
  padding: 22px 22px;
}

.btn-block {
  width: 100%;
}

.btn-block.btn {
  justify-content: center;
}

.form {
  display: grid;
  gap: 14px;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.field {
  display: grid;
  gap: 8px;
}

label {
  font-weight: 650;
  color: var(--text);
}

input,
textarea {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  padding: 12px 12px;
  outline: none;
  font: inherit;
}

textarea {
  resize: vertical;
  min-height: 140px;
}

input:focus,
textarea:focus {
  border-color: rgba(var(--accent-rgb), 0.65);
  box-shadow: 0 0 0 4px rgba(var(--accent-rgb), 0.16);
}

input[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: rgba(255, 91, 110, 0.65);
  box-shadow: 0 0 0 4px rgba(255, 91, 110, 0.14);
}

.field-error {
  min-height: 18px;
  margin: 0;
  color: rgba(255, 91, 110, 0.92);
  font-size: 0.92rem;
}

.checkbox {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  user-select: none;
}

.checkbox input {
  width: 18px;
  height: 18px;
  margin-top: 2px;
}

.hp {
  position: absolute;
  left: -99999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-actions {
  display: grid;
  gap: 10px;
}

.form-status {
  margin: 0;
  min-height: 18px;
}

.form-status[data-kind="success"] {
  color: rgba(53, 211, 155, 0.92);
}

.form-status[data-kind="error"] {
  color: rgba(255, 91, 110, 0.92);
}

.site-footer {
  padding: 26px 0 34px 0;
  border-top: 1px solid var(--border-subtle);
  background: var(--footer-bg);
}

.footer-inner {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 740;
}

@media (max-width: 980px) {
  .cards,
  .pillars,
  .expertise-grid,
  .about-grid,
  .expertise-cards,
  .projects-grid,
  .approach-grid,
  .engineering-grid,
  .kb-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .depth-split {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .header-inner {
    flex-wrap: wrap;
  }

  .nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    gap: 8px;
    margin-left: 0;
    padding: 6px 0 0 0;
  }

  .header-inner {
    gap: 12px;
  }

  .brand {
    min-width: auto;
  }

  .cards,
  .pillars,
  .expertise-grid,
  .about-grid,
  .expertise-cards,
  .projects-grid,
  .approach-grid,
  .engineering-grid,
  .kb-grid,
  .depth-cards {
    grid-template-columns: 1fr;
  }

  .depth-split,
  .contact-split {
    grid-template-columns: 1fr;
  }

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

  .field-row {
    grid-template-columns: 1fr;
  }
}