/* d4l.dev site stylesheet.
   Every page loads this; the homepage also loads home.css.
   Layers: the design tokens (theme) and Tailwind's reset (base) sit in cascade
   layers, so every rule below them wins without needing more specificity. */

@layer theme, base;

@layer theme {
  :root {
  /* lifted dark, cool-purple cast */
  --color-bg:           #181C28;
  --color-bg-2:         #1E2336;
  --color-surface-1:    #232944;
  --color-surface-2:    #2C3354;
  --color-surface-3:    #3A4368;
  --color-border:       #343D62;
  --color-border-2:     #4B567E;
  --color-border-3:     #5E6B97;
  --color-text:         #F1F3FA;
  --color-text-2:       #C2C8DA;
  --color-text-mute:    #8A92AC;
  --color-text-mute-2:  #5E6580;

  /* lime accent — replaces copper everywhere */
  --color-accent:       #C7F26A;
  --color-accent-2:     #DDFA8E;
  --color-accent-soft:  rgba(199, 242, 106, 0.10);
  --color-accent-line:  rgba(199, 242, 106, 0.30);
  --color-on-accent:    #131806;

  --font-sans:  'Geist', -apple-system, system-ui, sans-serif;
  --font-mono:  'JetBrains Mono', ui-monospace, Menlo, monospace;
  --font-display: 'Geist', -apple-system, system-ui, sans-serif;

  --container-max: 1380px;

    /* Defaults the reset below reads. */
    --default-font-family: var(--font-sans);
    --default-mono-font-family: var(--font-mono);
    --default-transition-duration: 0.15s;
    --default-transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  }
}

/* Tailwind CSS v4 preflight (MIT License, https://tailwindcss.com). */
@layer base {
  *,
  :after,
  :before,
  ::backdrop {
    box-sizing: border-box;
    border: 0 solid;
    margin: 0;
    padding: 0;
  }
  ::file-selector-button {
    box-sizing: border-box;
    border: 0 solid;
    margin: 0;
    padding: 0;
  }
  html,
  :host {
    -webkit-text-size-adjust: 100%;
    tab-size: 4;
    line-height: 1.5;
    font-family: var(
      --default-font-family,
      ui-sans-serif,
      system-ui,
      sans-serif,
      "Apple Color Emoji",
      "Segoe UI Emoji",
      "Segoe UI Symbol",
      "Noto Color Emoji"
    );
    font-feature-settings: var(--default-font-feature-settings, normal);
    font-variation-settings: var(--default-font-variation-settings, normal);
    -webkit-tap-highlight-color: transparent;
  }
  hr {
    height: 0;
    color: inherit;
    border-top-width: 1px;
  }
  abbr:where([title]) {
    -webkit-text-decoration: underline dotted;
    text-decoration: underline dotted;
  }
  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    font-size: inherit;
    font-weight: inherit;
  }
  a {
    color: inherit;
    -webkit-text-decoration: inherit;
    text-decoration: inherit;
  }
  b,
  strong {
    font-weight: bolder;
  }
  code,
  kbd,
  samp,
  pre {
    font-family: var(
      --default-mono-font-family,
      ui-monospace,
      SFMono-Regular,
      Menlo,
      Monaco,
      Consolas,
      "Liberation Mono",
      "Courier New",
      monospace
    );
    font-feature-settings: var(--default-mono-font-feature-settings, normal);
    font-variation-settings: var(
      --default-mono-font-variation-settings,
      normal
    );
    font-size: 1em;
  }
  small {
    font-size: 80%;
  }
  sub,
  sup {
    vertical-align: baseline;
    font-size: 75%;
    line-height: 0;
    position: relative;
  }
  sub {
    bottom: -0.25em;
  }
  sup {
    top: -0.5em;
  }
  table {
    text-indent: 0;
    border-color: inherit;
    border-collapse: collapse;
  }
  :-moz-focusring {
    outline: auto;
  }
  progress {
    vertical-align: baseline;
  }
  summary {
    display: list-item;
  }
  ol,
  ul,
  menu {
    list-style: none;
  }
  img,
  svg,
  video,
  canvas,
  audio,
  iframe,
  embed,
  object {
    vertical-align: middle;
    display: block;
  }
  img,
  video {
    max-width: 100%;
    height: auto;
  }
  button,
  input,
  select,
  optgroup,
  textarea {
    font: inherit;
    font-feature-settings: inherit;
    font-variation-settings: inherit;
    letter-spacing: inherit;
    color: inherit;
    opacity: 1;
    background-color: #0000;
    border-radius: 0;
  }
  ::file-selector-button {
    font: inherit;
    font-feature-settings: inherit;
    font-variation-settings: inherit;
    letter-spacing: inherit;
    color: inherit;
    opacity: 1;
    background-color: #0000;
    border-radius: 0;
  }
  :where(select:is([multiple], [size])) optgroup {
    font-weight: bolder;
  }
  :where(select:is([multiple], [size])) optgroup option {
    padding-inline-start: 20px;
  }
  ::file-selector-button {
    margin-inline-end: 4px;
  }
  ::placeholder {
    opacity: 1;
  }
  @supports (not ((-webkit-appearance: -apple-pay-button))) or
    (contain-intrinsic-size: 1px) {
    ::placeholder {
      color: currentColor;
    }
    @supports (color: color-mix(in lab, red, red)) {
      ::placeholder {
        color: color-mix(in oklab, currentcolor 50%, transparent);
      }
    }
  }
  textarea {
    resize: vertical;
  }
  ::-webkit-search-decoration {
    -webkit-appearance: none;
  }
  ::-webkit-date-and-time-value {
    min-height: 1lh;
    text-align: inherit;
  }
  ::-webkit-datetime-edit {
    display: inline-flex;
  }
  ::-webkit-datetime-edit-fields-wrapper {
    padding: 0;
  }
  ::-webkit-datetime-edit {
    padding-block: 0;
  }
  ::-webkit-datetime-edit-year-field {
    padding-block: 0;
  }
  ::-webkit-datetime-edit-month-field {
    padding-block: 0;
  }
  ::-webkit-datetime-edit-day-field {
    padding-block: 0;
  }
  ::-webkit-datetime-edit-hour-field {
    padding-block: 0;
  }
  ::-webkit-datetime-edit-minute-field {
    padding-block: 0;
  }
  ::-webkit-datetime-edit-second-field {
    padding-block: 0;
  }
  ::-webkit-datetime-edit-millisecond-field {
    padding-block: 0;
  }
  ::-webkit-datetime-edit-meridiem-field {
    padding-block: 0;
  }
  ::-webkit-calendar-picker-indicator {
    line-height: 1;
  }
  :-moz-ui-invalid {
    box-shadow: none;
  }
  button,
  input:where([type="button"], [type="reset"], [type="submit"]) {
    appearance: button;
  }
  ::file-selector-button {
    appearance: button;
  }
  ::-webkit-inner-spin-button {
    height: auto;
  }
  ::-webkit-outer-spin-button {
    height: auto;
  }
  [hidden]:where(:not([hidden="until-found"])) {
    display: none !important;
  }
}

/* ==========================================================================
   Global: base elements, container, buttons, section heads, prose
   ========================================================================== */

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: clip; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 15.5px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 1px;
}

.skip {
  position: absolute; left: -9999px; top: 12px;
  background: var(--color-accent); color: var(--color-on-accent);
  padding: 10px 14px;
  font-family: var(--font-mono); font-size: 12px;
  letter-spacing: 0.1em; text-transform: uppercase; font-weight: 600;
}
.skip:focus { left: 16px; z-index: 200; }

/* ----- container ----- */
.container {
  width: 100%;
  position: relative; z-index: 5;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(20px, 3.5vw, 56px);
}

/* ----- shared utilities ----- */
.mono { font-family: var(--font-mono); }
.label-mono {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--color-text-mute);
}
.label-mono b { color: var(--color-text); font-weight: 600; font-size: 12.5px; }
.accent { color: var(--color-accent); }

/* ----- buttons ----- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 18px;
  font-family: var(--font-mono);
  font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; font-weight: 600;
  color: var(--color-on-accent); background: var(--color-accent);
  border: 1px solid var(--color-accent);
  cursor: pointer; line-height: 1;
  transition: filter 180ms;
}
.btn:hover { filter: brightness(1.08); }
.btn--outline {
  background: transparent; color: var(--color-text); border-color: var(--color-border-2);
  filter: none;
}
.btn--outline:hover {
  border-color: var(--color-accent); color: var(--color-accent); background: var(--color-accent-soft);
  filter: none;
}

/* ----- section heads ----- */
section { padding: clamp(72px, 9vw, 128px) 0; }

.section__head {
  display: grid; grid-template-columns: 1fr; gap: 14px;
  margin-bottom: clamp(40px, 5vw, 64px);
  padding-bottom: 22px;
  border-bottom: 1px solid var(--color-border);
}
@media (min-width: 980px) {
  .section__head {
    grid-template-columns: 280px 1fr;
    gap: 56px; align-items: end;
  }
}
.section__index {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--color-text-mute);
  display: flex; align-items: center; gap: 10px;
}
.section__index::before {
  content: ""; width: 5px; height: 5px; background: var(--color-accent);
}
.section__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(30px, 3.6vw, 52px);
  line-height: 1.06; letter-spacing: -0.025em;
  margin: 0 0 10px; max-width: 22ch;
}
.section__title b { font-weight: 600; color: var(--color-accent); }
.section__title em {
  font-style: italic; font-weight: 400;
  color: var(--color-accent);
}
.section__sub {
  font-size: 16px; color: var(--color-text-2); max-width: 56ch; margin: 0;
}

/* ----- prose: rendered MDX/Markdown content on detail pages ----- */
.prose {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-2);
  max-width: 72ch;
}
.prose > * + * { margin-top: 1.4em; }
.prose h1 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 4.4vw, 56px);
  line-height: 1.05; letter-spacing: -0.025em;
  color: var(--color-text); margin-top: 0; max-width: 22ch;
}
.prose h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(22px, 2.4vw, 30px);
  letter-spacing: -0.015em; line-height: 1.2;
  color: var(--color-text); margin-top: 2.4em; padding-top: 1.2em;
  border-top: 1px solid var(--color-border);
}
.prose h3 {
  font-family: var(--font-display);
  font-weight: 600; font-size: 18px; letter-spacing: -0.01em;
  color: var(--color-text);
}
.prose p { margin: 0; }
.prose strong { color: var(--color-text); font-weight: 500; }
.prose a {
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent-line);
  transition: border-color 180ms ease;
}
.prose a:hover { border-bottom-color: var(--color-accent); }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0; }
.prose li { margin-bottom: 0.4em; }
.prose blockquote {
  border-left: 3px solid var(--color-accent);
  background: var(--color-bg-2);
  padding: 16px 20px; margin: 0;
  font-style: italic; font-size: 18px;
  color: var(--color-text);
}
.prose code {
  font-family: var(--font-mono); font-size: 13px;
  background: var(--color-bg-2);
  padding: 2px 6px; border: 1px solid var(--color-border);
  color: var(--color-text);
}
.prose hr {
  border: 0; height: 1px; background: var(--color-border); margin: 2em 0;
}

.page-shell {
  padding: clamp(56px, 8vw, 120px) 0;
}
.page-shell .container > * + * { margin-top: clamp(40px, 5vw, 64px); }

/* ----- reduced motion ----- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   Chrome: backdrop
   ========================================================================== */

.grit {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  background-image: url("/images/backdrop/grit.png");
  background-repeat: repeat;
  background-size: 1024px 682px;
  opacity: 0.13;
  mix-blend-mode: screen;
}

.ground-band {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  height: 4px;
  background: var(--color-accent);
  z-index: 2; pointer-events: none;
}

/* ==========================================================================
   Chrome: header
   ========================================================================== */

.head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(24, 28, 40, 0.78);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-accent-line);
}
.head__row {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 16px; padding-bottom: 16px;
  gap: 32px;
}
.nav {
  display: flex; gap: 28px; align-items: center;
  flex: 0 0 auto;
}
.nav a {
  font-family: var(--font-mono);
  font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--color-text-2);
  transition: color 160ms ease;
  white-space: nowrap;
}
.nav a:hover { color: var(--color-accent); }
.nav a:last-child { color: var(--color-accent); }
.nav a:last-child:hover { color: var(--color-text); }

@media (max-width: 1180px) {
  .nav { gap: 18px; }
  .nav a { font-size: 11px; letter-spacing: 0.1em; }
}
@media (max-width: 980px) {
  .nav { gap: 12px; }
  .nav a { font-size: 10px; letter-spacing: 0.06em; }
}

/* ==========================================================================
   Chrome: D4L.dev lockup
   ========================================================================== */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  line-height: 1;
}

.brand__primary {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--color-text);
  text-decoration: none;
  transition: opacity 160ms ease;
  line-height: 1;
}
.brand__primary:hover { opacity: 0.85; }
.brand__tld { color: var(--color-accent); font-weight: 600; }

.brand__by {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  transition: color 160ms ease;
}
.brand__by-text {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--color-text-mute);
  transition: color 160ms ease;
}

/* Deasil horizontal logo: viewBox 930×240 ≈ 3.875:1.
   Sized to match the cap-height of "D4L.dev" — at 20px font the cap is
   ~14px, so render the wordmark at ~16px tall. */
.brand__deasil {
  display: block;
  height: 18px;
  width: auto;
  flex: 0 0 auto;
}
.brand__letter,
.brand__d-stem {
  fill: var(--color-text);
  transition: fill 160ms ease;
}
.brand__letter {
  stroke: var(--color-text);
  stroke-width: 0.79px;
  stroke-miterlimit: 10;
  transition: fill 160ms ease, stroke 160ms ease;
}
.brand__d-bowl {
  fill: var(--color-text-2);
  transition: fill 160ms ease;
}
.brand__by:hover .brand__by-text { color: var(--color-accent); }
.brand__by:hover .brand__letter,
.brand__by:hover .brand__d-stem { fill: var(--color-accent); stroke: var(--color-accent); }
.brand__by:hover .brand__d-bowl { fill: var(--color-accent); }

@media (max-width: 720px) {
  .brand { gap: 10px; }
  .brand__by { gap: 6px; }
  .brand__deasil { height: 14px; }
}

/* ==========================================================================
   Chrome: footer
   ========================================================================== */

footer {
  padding: 56px 0 28px;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-2);
  font-family: var(--font-sans);
  font-size: 14px;
}
.foot__grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px;
}
@media (min-width: 880px) {
  .foot__grid { grid-template-columns: 1.6fr repeat(3, 1fr); }
}
.foot__col h4 {
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 14px; font-weight: 600;
}
.foot__col ul { list-style: none; padding: 0; margin: 0; }
.foot__col li { margin-bottom: 8px; }
.foot__col a {
  color: var(--color-text-2);
  transition: color 160ms ease;
}
.foot__col a:hover { color: var(--color-accent); }
.foot__lead {
  color: var(--color-text-2);
  line-height: 1.55;
  max-width: 36ch;
  margin-bottom: 18px;
}
.foot__lead a { color: var(--color-text); border-bottom: 1px solid var(--color-border-2); }
.foot__lead a:hover { color: var(--color-accent); border-color: var(--color-accent); }
.foot__lead .accent { color: var(--color-accent); font-weight: 600; }
.foot__addr {
  color: var(--color-text-2); font-size: 13.5px; line-height: 1.65;
}
.foot__addr a {
  color: var(--color-text-2); transition: color 160ms ease;
}
.foot__addr a:hover { color: var(--color-accent); }
.foot__legal {
  margin-top: 48px; padding-top: 18px;
  border-top: 1px solid var(--color-border);
  display: flex; justify-content: space-between; flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-text-mute);
  gap: 12px;
}

/* ==========================================================================
   Pages: legal (privacy, terms)
   ========================================================================== */

.legal-updated {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-text-mute);
}

/* ==========================================================================
   Pages: contact
   ========================================================================== */

.contact {
  display: grid; grid-template-columns: 1fr; gap: 56px;
}
@media (min-width: 980px) {
  .contact { grid-template-columns: 1fr 1.4fr; gap: 80px; align-items: start; }
}
.contact__intro h1 {
  font-family: var(--font-sans);
  font-weight: 250;
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.05; letter-spacing: -0.025em;
  margin: 14px 0 24px; color: var(--color-text);
  max-width: 18ch;
}
.contact__lede {
  font-size: 17px; color: var(--color-text-2);
  line-height: 1.6; margin: 0; max-width: 50ch;
}
.contact__cards {
  display: grid; grid-template-columns: 1fr; gap: 14px;
}
.contact__card {
  display: block;
  padding: 28px;
  background: linear-gradient(180deg, var(--color-surface-1), var(--color-bg-2));
  border: 1px solid var(--color-border-2);
  transition: border-color 180ms, transform 180ms;
}
.contact__card:hover { border-color: var(--color-accent); transform: translateY(-2px); }
.contact__card--static:hover { border-color: var(--color-border-2); transform: none; cursor: default; }
.contact__lab {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--color-accent); margin-bottom: 12px;
}
.contact__big {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 28px);
  color: var(--color-text);
  letter-spacing: -0.01em; line-height: 1.15;
  margin-bottom: 10px;
}
.contact__big--addr { font-size: 16px; line-height: 1.55; letter-spacing: 0; }
.contact__hint {
  font-size: 13.5px; color: var(--color-text-mute);
}

/* ==========================================================================
   Pages: 404
   ========================================================================== */

.nf { max-width: 56ch; }
.nf__code {
  font-family: var(--font-mono);
  font-size: clamp(64px, 12vw, 160px);
  font-weight: 500; line-height: 0.9; letter-spacing: -0.04em;
  color: var(--color-accent);
  margin-bottom: 18px;
}
.nf__t {
  font-family: var(--font-sans);
  font-weight: 250;
  font-size: clamp(28px, 3.6vw, 48px);
  line-height: 1.05; letter-spacing: -0.02em;
  margin: 0 0 18px; color: var(--color-text);
  max-width: 22ch;
}
.nf__d {
  font-size: 17px; color: var(--color-text-2); line-height: 1.55;
  margin: 0 0 28px;
}
.nf__cta {
  display: flex; gap: 12px; flex-wrap: wrap;
}