/* docs.d2k.uk styles.
   Tokens follow D2K Brand Guidelines v1 (July 2026). Colours are set here and nowhere else.
   Coral is a signal, not a theme: here it appears only as the point on the logo. */

@font-face { font-family: "Inter"; font-style: normal; font-weight: 400 800; font-display: swap; src: url("/assets/fonts/inter-latin-ext.woff2") format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 400 800; font-display: swap; src: url("/assets/fonts/inter-latin.woff2") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 400 700; font-display: swap; src: url("/assets/fonts/jetbrainsmono-latin-ext.woff2") format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 400 700; font-display: swap; src: url("/assets/fonts/jetbrainsmono-latin.woff2") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }

:root {
  --color-primary:      #2536BE;
  --color-primary-dark: #1B2790;
  --color-accent:       #FF6B5B;
  --color-ink:          #0B1020;
  --color-body:         #3D4663;
  --color-muted:        #6B7493;
  --color-bg-soft:      #F7F8FB;
  --color-line:         #E5E8F0;
  --color-bg:           #ffffff;
  --color-white:        #ffffff;
  --color-on-dark:      #AEB8D8;
  --color-primary-tint: rgba(37, 54, 190, .08);
  --color-line-on-dark: rgba(255, 255, 255, .12);
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --max-width: 1180px;
  --gutter: 1.5rem;
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(11, 16, 32, .06);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; scroll-padding-top: 5rem; }
body { margin: 0; font-family: var(--font-sans); font-size: 16.5px; line-height: 1.65; color: var(--color-body); background: var(--color-bg); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-dark); text-decoration: underline; }
h1, h2, h3, h4 { color: var(--color-ink); line-height: 1.25; letter-spacing: -0.01em; }
h1 { font-size: clamp(1.8rem, 3.4vw, 2.4rem); font-weight: 800; letter-spacing: -0.02em; margin: 0 0 .6em; }
h2 { font-size: 1.4rem; font-weight: 700; margin: 2.2rem 0 .6rem; }
h3 { font-size: 1.1rem; font-weight: 600; margin: 1.6rem 0 .5rem; }
p { margin: 0 0 1em; }
ul, ol { padding-left: 1.3rem; margin: 0 0 1em; }
li { margin-bottom: .35em; }
strong { color: var(--color-ink); font-weight: 600; }
:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 2px; border-radius: 4px; }
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--color-ink); color: var(--color-white); padding: .6rem 1rem; z-index: 100; }
.skip-link:focus { left: .5rem; top: .5rem; }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--gutter); }
.mono, .eyebrow, .updated { font-family: var(--font-mono); }
.eyebrow { display: block; font-size: .76rem; letter-spacing: .08em; text-transform: uppercase; color: var(--color-primary); font-weight: 500; margin-bottom: .8rem; }

/* Header */
.site-header { position: sticky; top: 0; background: rgba(255, 255, 255, .96); backdrop-filter: saturate(180%) blur(8px); border-bottom: 1px solid var(--color-line); z-index: 50; }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .7rem var(--gutter); }
.brand { display: flex; align-items: center; gap: .9rem; color: var(--color-ink); }
.brand:hover { text-decoration: none; }
.brand img { height: 42px; width: auto; }
.brand span { font-family: var(--font-mono); font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; color: var(--color-muted); border-left: 1px solid var(--color-line); padding-left: .9rem; }
.nav__links { list-style: none; display: flex; align-items: center; gap: 1.5rem; margin: 0; padding: 0; font-size: .93rem; font-weight: 500; }
.nav__links li { margin: 0; }
.nav__links a { color: var(--color-ink); }
.nav__links a:hover { color: var(--color-primary); text-decoration: none; }

/* Layout: sidebar and article */
.layout { display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: 3rem; padding-top: 2.25rem; padding-bottom: 4rem; align-items: start; }
.layout > main { order: 2; min-width: 0; }
.sidebar { order: 1; position: sticky; top: 5rem; max-height: calc(100vh - 6rem); overflow-y: auto; font-size: .93rem; padding-right: .5rem; }
.sidebar__product { font-weight: 700; color: var(--color-ink); display: block; margin-bottom: 1rem; }
.sidebar h2 { font-family: var(--font-mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; color: var(--color-muted); font-weight: 500; margin: 1.4rem 0 .5rem; }
.sidebar ul { list-style: none; padding: 0; margin: 0; }
.sidebar li { margin: 0; }
.sidebar a { display: block; padding: .32rem .7rem; border-radius: 6px; color: var(--color-body); border-left: 2px solid transparent; }
.sidebar a:hover { color: var(--color-primary); text-decoration: none; background: var(--color-bg-soft); }
.sidebar a[aria-current="page"] { color: var(--color-primary); font-weight: 600; background: var(--color-primary-tint); border-left-color: var(--color-primary); }

.breadcrumb { list-style: none; display: flex; flex-wrap: wrap; gap: .4rem; padding: 0; margin: 0 0 1.25rem; font-size: .84rem; color: var(--color-muted); }
.breadcrumb li { margin: 0; }
.breadcrumb li + li::before { content: "/"; margin-right: .4rem; color: var(--color-line); }
.breadcrumb a { color: var(--color-muted); }

.article { max-width: 780px; }
.article > .updated + p { font-size: 1.08rem; color: var(--color-ink); }
.article code { font-family: var(--font-mono); font-size: .87em; background: var(--color-bg-soft); border: 1px solid var(--color-line); border-radius: 4px; padding: .05em .35em; color: var(--color-ink); }
.article pre { background: var(--color-ink); color: var(--color-on-dark); border-radius: var(--radius); padding: 1.1rem 1.3rem; overflow-x: auto; font-size: .84rem; line-height: 1.65; margin: 0 0 1.2em; }
.article pre code { background: none; border: 0; padding: 0; color: inherit; font-size: inherit; }
.article blockquote { margin: 0 0 1.2em; padding: .9rem 1.2rem; border-left: 4px solid var(--color-primary); background: var(--color-bg-soft); border-radius: 0 var(--radius) var(--radius) 0; color: var(--color-ink); }
.article blockquote p:last-child { margin-bottom: 0; }
.table-wrap { border: 1px solid var(--color-line); border-radius: var(--radius); overflow-x: auto; margin: 0 0 1.3em; box-shadow: var(--shadow-sm); }
table { width: 100%; border-collapse: collapse; font-size: .93rem; }
th, td { text-align: left; padding: .65rem .95rem; border-bottom: 1px solid var(--color-line); vertical-align: top; }
thead th { font-family: var(--font-mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; color: var(--color-muted); font-weight: 500; background: var(--color-bg-soft); white-space: nowrap; }
tbody tr:last-child td { border-bottom: 0; }

.article figure { margin: 1.4rem 0 1.8rem; }
.article figure img { width: 100%; height: auto; border: 1px solid var(--color-line); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.article figcaption { font-size: .86rem; color: var(--color-muted); margin-top: .55rem; }
.updated { font-size: .76rem; color: var(--color-muted); margin: 0 0 1.5rem; }
.pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--color-line); font-size: .93rem; }
.pager a { display: block; border: 1px solid var(--color-line); border-radius: var(--radius); padding: .7rem 1rem; max-width: 48%; }
.pager a:hover { border-color: var(--color-primary); text-decoration: none; }
.pager span { display: block; font-family: var(--font-mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; color: var(--color-muted); }
.pager .next { margin-left: auto; text-align: right; }
.helpful { margin-top: 2rem; font-size: .9rem; color: var(--color-muted); }

/* Home */
.hero { background: var(--color-bg-soft); border-bottom: 1px solid var(--color-line); padding: 3.5rem 0 3rem; }
.hero p { max-width: 720px; font-size: 1.1rem; }
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; padding-top: 3rem; padding-bottom: 4rem; }
.card { display: block; border: 1px solid var(--color-line); border-radius: var(--radius); padding: 1.6rem; box-shadow: var(--shadow-sm); color: inherit; background: var(--color-bg); }
a.card:hover { border-color: var(--color-primary); text-decoration: none; }
.card h2 { margin: 0 0 .5rem; font-size: 1.25rem; }
.card p:last-child { margin-bottom: 0; }

/* Footer */
.site-footer { background: var(--color-ink); color: var(--color-on-dark); padding: 2.5rem 0 1.5rem; font-size: .9rem; }
.site-footer a { color: var(--color-on-dark); }
.site-footer a:hover { color: var(--color-white); }
.site-footer img { height: 42px; width: auto; }
.footer__cols { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2rem; margin-bottom: 1.5rem; }
.footer__cols h2 { color: var(--color-white); font-family: var(--font-mono); font-size: .72rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; margin: 0 0 .8rem; }
.footer__cols ul { list-style: none; padding: 0; margin: 0; }
.footer__cols li { margin-bottom: .35rem; }
.footer__bottom { border-top: 1px solid var(--color-line-on-dark); padding-top: 1.2rem; color: var(--color-muted); font-size: .84rem; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; gap: 1.5rem; padding-top: 1.25rem; }
  .sidebar { order: 3; position: static; max-height: none; border-top: 1px solid var(--color-line); padding: 1.5rem 0 0; }
  .cards, .footer__cols { grid-template-columns: 1fr; }
  .nav__links li.hide-sm { display: none; }
  .pager { flex-direction: column; } .pager a { max-width: none; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }