/* Minimal Carbon-inspired baseline (see DESIGN.md) */
:root {
  /* Core */
  --cds-background: #ffffff;
  --cds-text-primary: #161616;
  --cds-text-secondary: #525252;
  --cds-border-subtle: #c6c6c6;
  --cds-layer-01: #f4f4f4;
  --cds-layer-01-hover: #e8e8e8;

  /* Interactive */
  --cds-link-primary: #0f62fe;
  --cds-link-primary-hover: #0043ce;
  --cds-button-primary: #0f62fe;
  --cds-button-primary-hover: #0353e9;
  --cds-button-primary-active: #002d9c;
  --cds-focus: #0f62fe;

  /* Layout rhythm */
  --space-2: 2px;
  --space-4: 4px;
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-24: 24px;
  --space-32: 32px;
  --space-48: 48px;
  --space-64: 64px;
  --space-80: 80px;
  --space-96: 96px;

  --container-max: 1584px;
  --container-gutter: 32px;
  --container-gutter-mobile: 16px;

  /* Type */
  --font-sans: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", Menlo, Courier, monospace;

  --display-01-size: 3.75rem; /* 60px */
  --display-01-line: 1.17;
  --heading-02-size: 2rem; /* 32px */
  --heading-03-size: 1.5rem; /* 24px */
  --body-long-01-size: 1rem; /* 16px */
  --body-short-01-size: 0.875rem; /* 14px */
  --caption-01-size: 0.75rem; /* 12px */
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--body-long-01-size);
  line-height: 1.5;
  color: var(--cds-text-primary);
  background: var(--cds-background);
}

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

a {
  color: var(--cds-link-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover {
  color: var(--cds-link-primary-hover);
  text-decoration: underline;
}

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

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-gutter);
  padding-right: var(--container-gutter);
}

@media (max-width: 672px) {
  .container {
    padding-left: var(--container-gutter-mobile);
    padding-right: var(--container-gutter-mobile);
  }
}

/* Masthead */
.masthead {
  background: #161616;
  color: #f4f4f4;
  height: 48px;
  display: flex;
  align-items: center;
}

.masthead__inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-16);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-12);
  color: inherit;
  text-decoration: none;
}
.brand:hover {
  color: inherit;
  text-decoration: none;
}

.brand__mark {
  width: 20px;
  height: 20px;
  border: 2px solid #f4f4f4;
  border-radius: 0;
  position: relative;
}
.brand__mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 2px solid #f4f4f4;
}

.nav {
  display: flex;
  align-items: center;
  height: 48px;
}

.nav a {
  height: 48px;
  display: inline-flex;
  align-items: center;
  padding: 0 var(--space-16);
  font-size: var(--body-short-01-size);
  letter-spacing: 0.16px;
  color: #c6c6c6;
  text-decoration: none;
  border-bottom: 2px solid transparent;
}
.nav a:hover {
  color: #ffffff;
}
.nav a[aria-current="page"] {
  color: #ffffff;
  border-bottom-color: #ffffff;
}

/* Sections */
.band {
  padding: var(--space-80) 0;
}
.band--layer {
  background: var(--cds-layer-01);
}

@media (max-width: 672px) {
  .band {
    padding: var(--space-48) 0;
  }
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-48);
  align-items: start;
}

@media (max-width: 1056px) {
  .hero {
    grid-template-columns: 1fr;
    gap: var(--space-32);
  }
}

h1,
h2,
h3 {
  margin: 0;
}

.display-01 {
  font-size: var(--display-01-size);
  line-height: var(--display-01-line);
  font-weight: 300;
}

@media (max-width: 672px) {
  .display-01 {
    font-size: 2.63rem; /* ~42px */
  }
}

.subtitle {
  margin-top: var(--space-16);
  color: var(--cds-text-secondary);
  max-width: 42rem;
}

.cta-row {
  margin-top: var(--space-32);
  display: flex;
  gap: var(--space-16);
  flex-wrap: wrap;
}

.button {
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 63px 14px 15px;
  border: 1px solid transparent;
  border-radius: 0;
  font-size: var(--body-short-01-size);
  letter-spacing: 0.16px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  user-select: none;
}

.button--primary {
  background: var(--cds-button-primary);
  color: #ffffff;
}
.button--primary:hover {
  background: var(--cds-button-primary-hover);
  color: #ffffff;
  text-decoration: none;
}
.button--primary:active {
  background: var(--cds-button-primary-active);
}

.button--ghost {
  background: transparent;
  color: var(--cds-link-primary);
  border-color: var(--cds-link-primary);
}
.button--ghost:hover {
  color: var(--cds-link-primary-hover);
  border-color: var(--cds-link-primary-hover);
  background: #edf5ff;
  text-decoration: none;
}

/* Tiles */
.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-16);
}
@media (max-width: 1056px) {
  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 672px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

.tile {
  background: var(--cds-layer-01);
  padding: var(--space-16);
  border-radius: 0;
  text-decoration: none;
  color: inherit;
  min-height: 160px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-16);
}
.tile:hover {
  background: var(--cds-layer-01-hover);
  text-decoration: none;
}

.tile__title {
  font-size: 1.25rem; /* 20px */
  line-height: 1.4;
  font-weight: 600;
}
.tile__body {
  font-size: var(--body-short-01-size);
  letter-spacing: 0.16px;
  line-height: 1.29;
  color: var(--cds-text-secondary);
}

/* Footer */
footer {
  background: #161616;
  color: #c6c6c6;
  padding: var(--space-48) 0;
}
footer a {
  color: #c6c6c6;
}
footer a:hover {
  color: #ffffff;
}
.footer__meta {
  margin-top: var(--space-24);
  font-size: var(--caption-01-size);
  letter-spacing: 0.32px;
}