/* Carbon Design System flavored overrides for CDN in a Box.
   Relies on Carbon themes.css for --cds-* tokens (g100 zone) and IBM Plex Sans. */

:root {
  --cds-layer-stack: var(--cds-layer-01, #262626);
  --cds-layer-stack-hover: var(--cds-layer-hover-01, #333333);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  background: var(--cds-background, #161616);
  color: var(--cds-text-primary, #f4f4f4);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--cds-link-primary, #78a9ff); text-decoration: none; }
a:hover { color: var(--cds-link-primary-hover, #a6c8ff); text-decoration: underline; }

/* Layout container */
.cds-container { max-width: 1320px; margin: 0 auto; padding: 0 2rem; }

/* Section */
.cds-section { padding: 5rem 0; }
.cds-section--subpage { padding: 4rem 0 2rem; }
.cds-section--head { background: radial-gradient(900px 420px at 50% -10%, rgba(120,169,255,0.18), transparent 70%), var(--cds-background, #161616); }

/* Header */
.cds-header { position: sticky; top: 0; z-index: 100; background: var(--cds-shell-header-bg, #161616); border-bottom: 1px solid var(--cds-border-subtle, #393939); }
.cds-header__inner { display: flex; align-items: center; gap: 2rem; max-width: 1320px; margin: 0 auto; padding: 0 2rem; height: 3rem; }
.cds-header__name { display: inline-flex; align-items: center; color: var(--cds-text-primary, #f4f4f4); line-height: 0; }
.cds-header__name:hover { text-decoration: none; }
.cds-header__logo { display: block; height: 28px; width: auto; }
.cds-header__name-prefix { color: var(--cds-text-primary, #f4f4f4); }
.cds-header__name-suffix { color: var(--cds-text-secondary, #c6c6c6); font-weight: 400; }
.cds-header__nav { display: flex; gap: 0.25rem; flex: 1; }
.cds-header__nav-item { padding: 0.875rem 1rem; font-size: 0.875rem; font-weight: 500; color: var(--cds-text-secondary, #c6c6c6); border-bottom: 2px solid transparent; }
.cds-header__nav-item:hover { color: var(--cds-text-primary, #f4f4f4); text-decoration: none; background: var(--cds-background-hover, #262626); }
.cds-header__nav-item--active { color: var(--cds-text-primary, #f4f4f4); border-bottom-color: var(--cds-interactive, #4589ff); }
.cds-header__actions { margin-left: auto; display: flex; align-items: center; gap: 1rem; }

/* Language switcher */
.cds-lang { display: inline-flex; gap: 0.25rem; font-size: 0.875rem; font-weight: 500; }
.cds-lang__link { padding: 0.375rem 0.625rem; color: var(--cds-text-secondary, #c6c6c6); border: 1px solid var(--cds-border-subtle, #393939); }
.cds-lang__link:hover { color: var(--cds-text-primary, #f4f4f4); text-decoration: none; background: var(--cds-background-hover, #262626); }
.cds-lang__link--active { color: var(--cds-text-primary, #f4f4f4); background: var(--cds-layer, #262626); border-color: var(--cds-interactive, #4589ff); }

/* Buttons */
.cds-btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.6875rem 1rem; font-size: 0.875rem; font-weight: 600; border: 1px solid transparent; border-radius: 0; cursor: pointer; transition: background 0.15s ease; text-decoration: none; }
.cds-btn:hover { text-decoration: none; }
.cds-btn--primary { background: var(--cds-button-primary, #0f62fe); color: var(--cds-text-on-color, #ffffff); }
.cds-btn--primary:hover { background: var(--cds-button-primary-hover, #0050e6); }
.cds-btn--secondary { background: var(--cds-button-secondary, #393939); color: var(--cds-text-on-color, #ffffff); }
.cds-btn--secondary:hover { background: var(--cds-button-secondary-hover, #4c4c4c); }

/* Typography helpers */
.cds-kicker { margin: 0 0 1rem; font-size: 0.875rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--cds-text-secondary, #c6c6c6); }
.cds-display { margin: 0 0 1.5rem; font-size: 3.75rem; font-weight: 300; line-height: 1.08; letter-spacing: -0.03em; }
.cds-display-sm { font-size: 1.25rem; font-weight: 600; display: block; margin-bottom: 0.5rem; }
.cds-heading { margin: 0 0 0.5rem; font-size: 2rem; font-weight: 400; }
.cds-heading--page { font-size: 2.5rem; font-weight: 300; }
.cds-productive-heading { margin: 0 0 0.5rem; font-size: 1.125rem; font-weight: 600; }
.cds-lead { max-width: 48rem; margin: 0 0 2rem; font-size: 1.125rem; font-weight: 300; color: var(--cds-text-secondary, #c6c6c6); }
.cds-body { color: var(--cds-text-secondary, #c6c6c6); }
.cds-caption { font-size: 0.75rem; color: var(--cds-text-secondary, #c6c6c6); }
.cds-post-date { margin: 0 0 0.5rem; font-size: 0.75rem; font-weight: 500; letter-spacing: 0.05em; text-transform: uppercase; color: var(--cds-text-secondary, #c6c6c6); }
.cds-post-back { margin: 0 0 1.5rem; font-size: 0.875rem; }
.cds-post-back a { color: var(--cds-text-secondary, #c6c6c6); }
.cds-post-back a:hover { color: var(--cds-link-primary-hover, #a6c8ff); }
.cds-hero__title { margin-bottom: 1.5rem; }
.cds-hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 2rem; }

/* Grid of cards */
.cds-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; }
.cds-grid--spaced { margin-top: 2rem; }

/* Clickable tiles (Carbon-like) */
.cds-tile { position: relative; display: flex; flex-direction: column; justify-content: space-between; min-height: 13rem; padding: 1.5rem; background: var(--cds-layer, #262626); border: 1px solid var(--cds-layer-active, #8d8d8d); outline: 1px solid transparent; transition: outline 0.15s ease, background 0.15s ease; text-decoration: none; }
.cds-tile:hover { text-decoration: none; outline: 1px solid var(--cds-interactive, #4589ff); outline-offset: -1px; }
.cds-tile__content { color: var(--cds-text-secondary, #c6c6c6); }
.cds-tile:hover .cds-tile__content .cds-productive-heading { color: var(--cds-interactive, #4589ff); }
.cds-tile__heading { color: var(--cds-text-primary, #f4f4f4); }
.cds-tile__desc { margin: 0 0 1rem; font-size: 0.875rem; font-weight: 300; color: var(--cds-text-secondary, #c6c6c6); }
.cds-tile__arrow { font-size: 1.5rem; color: var(--cds-icon-primary, #f4f4f4); align-self: flex-end; }

/* Prose */
.cds-prose h2 { border-bottom: 1px solid var(--cds-border-subtle, #393939); padding-bottom: 0.5rem; margin-top: 2rem; }
.cds-prose h3 { margin-top: 1.5rem; }
.cds-prose code { font-family: "IBM Plex Mono", monospace; background: var(--cds-layer, #262626); padding: 0.125rem 0.375rem; font-size: 0.875em; }
.cds-prose pre { background: var(--cds-layer, #262626); padding: 1rem; overflow: auto; border-radius: 0; }
.cds-prose pre code { background: none; padding: 0; }

/* Footer */
.cds-footer { border-top: 1px solid var(--cds-border-subtle, #393939); background: var(--cds-shell-footer-bg, #161616); padding: 3rem 0 1.5rem; }
.cds-footer__inner { }
.cds-footer__grid { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; align-items: start; }
.cds-footer__brand p { max-width: 32rem; margin: 0; }
.cds-footer__logo { display: block; height: 28px; width: auto; margin-bottom: 0.75rem; }
.cds-footer__links { display: flex; flex-direction: column; gap: 0.75rem; }
.cds-footer__links a { color: var(--cds-text-secondary, #c6c6c6); }
.cds-footer__links a:hover { color: var(--cds-text-primary, #f4f4f4); }
.cds-footer__copy { margin: 2rem 0 0; text-align: center; }

@media (max-width: 880px) {
  .cds-header__inner { flex-wrap: wrap; height: auto; padding: 0.5rem 1rem; gap: 0.5rem; }
  .cds-header__nav { order: 3; width: 100%; flex-wrap: wrap; gap: 0; }
  .cds-header__nav-item { padding: 0.625rem 0.75rem; }
  .cds-display { font-size: 2.5rem; }
  .cds-footer__grid { grid-template-columns: 1fr; }
}