/* ==========================================================================
   Ḍād docs theme
   Palette from Islamic manuscripts and Iznik tiles: lapis, gold leaf,
   turquoise glaze and madder red. Display type: Aref Ruqaa (calligraphic).
   ========================================================================== */

@import url("https://fonts.googleapis.com/css2?family=Aref+Ruqaa:wght@400;700&display=swap");

:root {
  --dad-lapis: #1B2B6B;
  --dad-lapis-deep: #121E4D;
  --dad-lapis-bright: #2A47B8;
  --dad-gold: #C9A04A;
  --dad-gold-soft: #E3C77F;
  --dad-gold-ink: #8A6420;
  --dad-turquoise: #0E8F9A;
  --dad-madder: #8E3B5E;
  --dad-ink: #141A33;
  --dad-display: "Aref Ruqaa", "Noto Naskh Arabic", "Geeza Pro", "Traditional Arabic", serif;
  /* Eight-pointed star lattice, one 96px tile */
  --dad-tile: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='96' height='96' viewBox='0 0 96 96'%3E%3Cg fill='none' stroke='%23E3C77F' stroke-width='1'%3E%3Crect x='28' y='28' width='40' height='40'/%3E%3Cpath d='M48 19.7 76.3 48 48 76.3 19.7 48Z'/%3E%3Cpath d='M48 19.7V0M76.3 48H96M48 76.3V96M19.7 48H0M28 28 0 0M68 28 96 0M68 68l28 28M28 68 0 96'/%3E%3C/g%3E%3C/svg%3E");
}

/* ---------- Material colour hooks ---------- */

[data-md-color-primary="custom"] {
  --md-primary-fg-color: var(--dad-lapis);
  --md-primary-fg-color--light: var(--dad-lapis-bright);
  --md-primary-fg-color--dark: var(--dad-lapis-deep);
  --md-primary-bg-color: #FFFFFF;
  --md-primary-bg-color--light: rgba(255, 255, 255, 0.7);
}

[data-md-color-accent="custom"] {
  --md-accent-fg-color: var(--dad-turquoise);
  --md-accent-fg-color--transparent: rgba(14, 143, 154, 0.1);
  --md-accent-bg-color: #FFFFFF;
}

[data-md-color-scheme="default"] {
  --md-default-fg-color: rgba(20, 26, 51, 0.88);
  --md-default-fg-color--light: rgba(20, 26, 51, 0.62);
  --md-default-fg-color--lighter: rgba(20, 26, 51, 0.32);
  --md-default-fg-color--lightest: rgba(20, 26, 51, 0.1);
  --md-typeset-a-color: var(--dad-lapis-bright);
  --md-footer-bg-color: var(--dad-lapis-deep);
  --md-footer-bg-color--dark: #0C1538;

  --md-code-bg-color: #F3F5FB;
  --md-code-fg-color: var(--dad-ink);
  --md-code-hl-keyword-color: var(--dad-lapis-bright);
  --md-code-hl-constant-color: var(--dad-turquoise);
  --md-code-hl-number-color: var(--dad-turquoise);
  --md-code-hl-string-color: var(--dad-gold-ink);
  --md-code-hl-function-color: var(--dad-madder);
  --md-code-hl-comment-color: #7A8099;
  --md-code-hl-operator-color: #5A6180;
  --md-code-hl-punctuation-color: #5A6180;
  --md-code-hl-name-color: var(--dad-ink);
  --md-code-hl-variable-color: var(--dad-ink);

  --dad-principle-glyph: var(--dad-gold-ink);
}

[data-md-color-scheme="slate"] {
  --md-hue: 230;
  --md-default-bg-color: #0E1430;
  --md-default-bg-color--light: rgba(14, 20, 48, 0.54);
  --md-default-fg-color: rgba(226, 231, 248, 0.86);
  --md-default-fg-color--light: rgba(226, 231, 248, 0.6);
  --md-default-fg-color--lighter: rgba(226, 231, 248, 0.3);
  --md-default-fg-color--lightest: rgba(226, 231, 248, 0.1);
  --md-typeset-a-color: #8FA6F2;
  --md-accent-fg-color: #4FC7CF;
  --md-footer-bg-color: #0A0F26;
  --md-footer-bg-color--dark: #070B1C;

  --md-code-bg-color: #151D42;
  --md-code-fg-color: #DDE3F7;
  --md-code-hl-keyword-color: #8FA6F2;
  --md-code-hl-constant-color: #4FC7CF;
  --md-code-hl-number-color: #4FC7CF;
  --md-code-hl-string-color: var(--dad-gold-soft);
  --md-code-hl-function-color: #E39BB8;
  --md-code-hl-comment-color: #7C86AD;
  --md-code-hl-operator-color: #A6AECB;
  --md-code-hl-punctuation-color: #A6AECB;
  --md-code-hl-name-color: #DDE3F7;
  --md-code-hl-variable-color: #DDE3F7;

  --dad-principle-glyph: var(--dad-gold-soft);
}

::selection {
  background-color: rgba(201, 160, 74, 0.35);
}

/* ---------- Header logo: the letter itself ---------- */

.dad-logo {
  display: inline-block;
  font-family: var(--dad-display);
  font-size: 1.85rem;
  line-height: 1;
  color: var(--dad-gold-soft);
  transform: translateY(-0.12rem);
}

/* ---------- Ḍād code: right-to-left ---------- */

.language-dad,
.language-dad pre,
.language-dad code {
  direction: rtl;
  text-align: right;
}

.language-dad code {
  font-size: 0.9em;
  line-height: 1.9;
  font-family: var(--md-code-font-family), "IBM Plex Sans Arabic", sans-serif;
}

/* Terminal output that is mostly Arabic */
.dad-out,
.dad-out pre,
.dad-out code {
  direction: rtl;
  text-align: right;
}

.dad-out code {
  white-space: pre-wrap;
}

.dad-out .md-code__nav,
.language-dad .md-code__nav {
  right: auto;
  left: 0.5em;
}

/* Mixed Arabic/Latin inline code reads correctly in either direction. */
.md-typeset :not(pre) > code {
  unicode-bidi: plaintext;
}

.md-typeset h1 {
  font-weight: 600;
  color: var(--md-default-fg-color);
}

/* ==========================================================================
   Home page
   ========================================================================== */

.dad-hero {
  position: relative;
  overflow: hidden;
  background-color: var(--dad-lapis);
  background-image: var(--dad-tile);
  background-size: 96px 96px;
  color: #FFFFFF;
}

/* Fade the lattice out behind the text so it stays legible. */
.dad-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg,
      var(--dad-lapis) 0%,
      rgba(27, 43, 107, 0.92) 42%,
      rgba(27, 43, 107, 0.55) 100%);
}

.dad-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  align-items: center;
  gap: 2rem;
  padding: 4.5rem 0.8rem 4rem;
}

.dad-hero__text.md-typeset {
  color: rgba(255, 255, 255, 0.86);
  font-size: 0.95rem;
}

.md-typeset h1.dad-hero__title {
  margin: 0 0 1.4rem;
  font-family: var(--dad-display);
  font-weight: 700;
  font-size: clamp(2.3rem, 4.6vw, 3.5rem);
  line-height: 1.45;
  letter-spacing: 0;
  color: #FFFFFF;
  text-align: left;
}

.dad-hero__lede {
  max-width: 34em;
  margin: 0 0 1.8rem;
  line-height: 1.65;
}

.dad-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-bottom: 2rem;
}

.md-typeset .dad-hero__actions .md-button {
  margin: 0;
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.5);
  border-radius: 0.3rem;
}

.md-typeset .dad-hero__actions .md-button:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: #FFFFFF;
}

.md-typeset .dad-hero__actions .md-button--primary {
  background-color: var(--dad-gold);
  border-color: var(--dad-gold);
  color: var(--dad-ink);
}

.md-typeset .dad-hero__actions .md-button--primary:hover {
  background-color: var(--dad-gold-soft);
  border-color: var(--dad-gold-soft);
  color: var(--dad-ink);
}

.dad-hero a:focus-visible {
  outline: 2px solid var(--dad-gold-soft);
  outline-offset: 3px;
}

.md-typeset a.dad-hero__status {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.72);
}

.md-typeset a.dad-hero__status:hover {
  color: #FFFFFF;
}

.dad-hero__dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background-color: var(--dad-gold);
  box-shadow: 0 0 0 0.25rem rgba(201, 160, 74, 0.25);
}

.dad-hero__glyph {
  font-family: var(--dad-display);
  font-size: clamp(10rem, 24vw, 20rem);
  line-height: 1;
  color: var(--dad-gold);
  text-align: center;
  direction: rtl;
  user-select: none;
  text-shadow: 0 0.035em 0 rgba(8, 14, 40, 0.35);
}

/* The one orchestrated moment: the letter is inked right-to-left on load. */
.dad-hero__glyph span {
  display: inline-block;
  padding: 0 0.08em;
  animation: dad-ink 1.5s cubic-bezier(0.2, 0.7, 0.2, 1) 0.2s both;
}

@keyframes dad-ink {
  from {
    clip-path: inset(0 0 0 100%);
    opacity: 0.35;
  }
  to {
    clip-path: inset(0 0 0 0);
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .dad-hero__glyph span {
    animation: none;
  }
}

/* ---------- Showcase: code + legend ---------- */

.dad-showcase {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 2.2rem;
  align-items: start;
}

.dad-showcase__code .highlight {
  margin: 0;
}

.md-typeset .dad-legend {
  margin: 0.4rem 0 0;
}

.md-typeset .dad-legend dt {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--md-code-hl-keyword-color);
}

.md-typeset .dad-legend dd {
  margin: 0.2rem 0 1.3rem;
  color: var(--md-default-fg-color--light);
}

/* ---------- Principles, keyed by keyword ---------- */

.md-typeset .dad-principles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 2.5rem;
  margin: 1rem 0 0;
}

.md-typeset .dad-principles > div {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 1rem;
  align-items: baseline;
  padding: 1.1rem 0;
  border-top: 1px solid var(--md-default-fg-color--lightest);
}

.md-typeset .dad-principles dt {
  margin: 0;
  font-family: var(--dad-display);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  text-align: center;
  color: var(--dad-principle-glyph);
}

.md-typeset .dad-principles dd {
  margin: 0;
}

.md-typeset .dad-principles dd strong {
  display: block;
  margin-bottom: 0.15rem;
  color: var(--md-default-fg-color);
}

/* ---------- Roadmap timeline (a real sequence: phases 0–5) ---------- */

.md-typeset ol.dad-timeline {
  counter-reset: phase -1;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  margin: 1.4rem 0 1.6rem;
  padding: 0;
}

.md-typeset ol.dad-timeline li {
  counter-increment: phase;
  position: relative;
  margin: 0;
  padding: 2.4rem 0.8rem 0 0;
}

.md-typeset ol.dad-timeline li::before {
  content: counter(phase, arabic-indic);
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  border: 2px solid var(--md-default-fg-color--lighter);
  background-color: var(--md-default-bg-color);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--md-default-fg-color--light);
}

.md-typeset ol.dad-timeline li::after {
  content: "";
  position: absolute;
  top: 0.85rem;
  left: 1.7rem;
  right: 0;
  height: 2px;
  background-color: var(--md-default-fg-color--lightest);
}

.md-typeset ol.dad-timeline li:last-child::after {
  display: none;
}

.md-typeset ol.dad-timeline li.is-done::before {
  border-color: var(--dad-turquoise);
  background-color: var(--dad-turquoise);
  color: #FFFFFF;
}

.md-typeset ol.dad-timeline li.is-done::after {
  background-color: var(--dad-turquoise);
}

.md-typeset ol.dad-timeline li.is-next::before {
  border-color: var(--dad-gold);
  color: var(--dad-gold-ink);
}

[data-md-color-scheme="slate"] .md-typeset ol.dad-timeline li.is-next::before {
  color: var(--dad-gold-soft);
}

.md-typeset ol.dad-timeline span {
  display: block;
  font-weight: 600;
  color: var(--md-default-fg-color);
}

.md-typeset ol.dad-timeline small {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.68rem;
  line-height: 1.5;
  color: var(--md-default-fg-color--light);
}

/* ---------- Small screens ---------- */

@media screen and (max-width: 59.984em) {
  .dad-hero__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding: 2rem 0.8rem 2.6rem;
  }

  .dad-hero::before {
    background: linear-gradient(180deg,
        rgba(27, 43, 107, 0.55) 0%,
        var(--dad-lapis) 45%);
  }

  .dad-hero__glyph {
    order: -1;
    font-size: 6.5rem;
    line-height: 1.25;
    margin-bottom: 0.6rem;
  }

  .dad-showcase,
  .md-typeset .dad-principles {
    grid-template-columns: minmax(0, 1fr);
  }

  .md-typeset ol.dad-timeline {
    grid-template-columns: minmax(0, 1fr);
  }

  .md-typeset ol.dad-timeline li {
    padding: 0.15rem 0 1.2rem 2.6rem;
  }

  .md-typeset ol.dad-timeline li::after {
    top: 1.7rem;
    bottom: 0;
    left: 0.85rem;
    right: auto;
    width: 2px;
    height: auto;
  }
}

/* ==========================================================================
   Playground
   ========================================================================== */

.dad-play__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 0.8rem;
  margin: 1.2rem 0 0.8rem;
  font-size: 0.75rem;
}

.dad-play__bar select {
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--md-default-fg-color--lighter);
  border-radius: 0.3rem;
  background-color: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  font: inherit;
}

.dad-play__status {
  margin-left: auto;
  color: var(--md-default-fg-color--light);
}

.dad-play__status.is-ready::before {
  content: "";
  display: inline-block;
  width: 0.45rem;
  height: 0.45rem;
  margin-right: 0.4rem;
  border-radius: 50%;
  background-color: var(--dad-turquoise);
  vertical-align: 0.05rem;
}

.dad-play__status.is-error {
  color: #C2410C;
}

.dad-play__panes {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1rem;
  align-items: stretch;
}

/* The editor is a transparent textarea over a highlighted copy of the same text.
   Both must share every metric that affects layout: font, size, line height,
   padding, border, wrapping and direction. Colours only, never bold. */
.dad-play__code {
  position: relative;
  display: grid;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.3rem;
  background-color: var(--md-code-bg-color);
}

.dad-play__code > .dad-play__editor,
.md-typeset .dad-play__code > pre.dad-play__hl,
.md-typeset .dad-play__code > pre.dad-play__hl > code {
  grid-area: 1 / 1;
  box-sizing: border-box;
  width: 100%;
  min-width: 0;
  margin: 0;
  padding: 0.9rem 1rem;
  border: 0;
  border-radius: 0.3rem;
  font-family: var(--md-code-font-family), "IBM Plex Sans Arabic", monospace;
  font-size: 0.8rem;
  font-weight: 400;
  line-height: 1.9;
  letter-spacing: normal;
  tab-size: 2;
  text-align: right;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  word-break: normal;
  font-variant-ligatures: none;
  font-feature-settings: normal;
  direction: rtl;
  unicode-bidi: isolate;
}

.md-typeset .dad-play__code > pre.dad-play__hl {
  padding: 0;
  overflow: hidden;
  background: none;
  color: var(--md-code-fg-color);
  pointer-events: none;
}

.md-typeset .dad-play__code > pre.dad-play__hl > code {
  display: block;
  background: none;
  color: inherit;
  box-shadow: none;
}

.dad-play__editor {
  position: relative;
  min-height: 24rem;
  overflow: hidden;
  resize: none;
  background: transparent;
  color: transparent;
  caret-color: var(--md-code-fg-color);
  -webkit-text-fill-color: transparent;
}

.dad-play__editor::selection {
  background-color: rgba(201, 160, 74, 0.35);
}

.dad-play__code:focus-within {
  outline: 2px solid var(--md-accent-fg-color);
  outline-offset: 1px;
}

.dad-play__editor:focus-visible {
  outline: none;
}

.hl-kw, .hl-decl { color: var(--md-code-hl-keyword-color); }
.hl-const, .hl-num { color: var(--md-code-hl-number-color); }
.hl-str, .hl-esc { color: var(--md-code-hl-string-color); }
.hl-esc { text-decoration: underline dotted; }
.hl-interp { color: var(--md-code-hl-keyword-color); }
.hl-com { color: var(--md-code-hl-comment-color); }
.hl-fn, .hl-builtin { color: var(--md-code-hl-function-color); }
.hl-type, .hl-this { color: var(--md-code-hl-constant-color); }
.hl-op { color: var(--md-code-hl-operator-color); }
.hl-bad { background-color: #C2410C; }


.dad-play__output {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  min-width: 0;
}

.md-typeset ul.dad-play__diags {
  margin: 0;
  padding: 0;
  list-style: none;
}

.md-typeset ul.dad-play__diags li {
  margin: 0 0 0.4rem;
  padding: 0.45rem 0.7rem;
  border-radius: 0.3rem;
  font-size: 0.75rem;
  line-height: 1.6;
  border-inline-start: 3px solid transparent;
}

.md-typeset ul.dad-play__diags li.is-error {
  background-color: rgba(194, 65, 12, 0.08);
  border-inline-start-color: #C2410C;
}

.md-typeset ul.dad-play__diags li.is-warning {
  background-color: rgba(201, 160, 74, 0.12);
  border-inline-start-color: var(--dad-gold);
}

.md-typeset ul.dad-play__diags li.dad-play__ok {
  background-color: rgba(14, 143, 154, 0.08);
  border-inline-start-color: var(--dad-turquoise);
  direction: rtl;
}

.dad-play__tokens {
  flex: 1;
  min-height: 12rem;
  max-height: 30rem;
  overflow: auto;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.3rem;
}

.dad-play__line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem;
  padding: 0.2rem 0;
}

.dad-play__ln {
  min-width: 1.6rem;
  font-size: 0.65rem;
  color: var(--md-default-fg-color--lighter);
}

.tok {
  display: inline-block;
  padding: 0.05rem 0.4rem;
  border-radius: 0.25rem;
  font-family: var(--md-code-font-family), "IBM Plex Sans Arabic", monospace;
  font-size: 0.72rem;
  line-height: 1.7;
  background-color: var(--md-code-bg-color);
  color: var(--md-code-fg-color);
  unicode-bidi: isolate;
  cursor: default;
}

.tok--keyword { color: var(--md-code-hl-keyword-color); font-weight: 600; }
.tok--number  { color: var(--md-code-hl-number-color); }
.tok--string  { color: var(--md-code-hl-string-color); }
.tok--symbol  { color: var(--md-code-hl-operator-color); }
.tok--illegal { color: #FFFFFF; background-color: #C2410C; }

.dad-play__legend {
  margin-top: 0.8rem;
  font-size: 0.7rem;
  color: var(--md-default-fg-color--light);
}

.dad-play__legend .tok {
  margin-right: 0.2rem;
}

.md-typeset .dad-play__run {
  margin: 0;
  padding: 0.35rem 1.4rem;
  font-size: 0.75rem;
}

.md-typeset .dad-play__run:disabled {
  opacity: 0.5;
  cursor: wait;
}

.dad-play__tabs {
  display: flex;
  gap: 0.2rem;
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
}

.dad-play__tabs button {
  padding: 0.35rem 0.8rem;
  border: 0;
  border-bottom: 2px solid transparent;
  background: none;
  color: var(--md-default-fg-color--light);
  font: inherit;
  font-size: 0.72rem;
  cursor: pointer;
}

.dad-play__tabs button[aria-selected="true"] {
  border-bottom-color: var(--dad-gold);
  color: var(--md-default-fg-color);
  font-weight: 600;
}

.dad-play__tabs button:focus-visible {
  outline: 2px solid var(--md-accent-fg-color);
}

.md-typeset pre.dad-play__out {
  flex: 1;
  min-height: 12rem;
  max-height: 30rem;
  overflow: auto;
  margin: 0;
  padding: 0.8rem 1rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.3rem;
  background-color: var(--md-code-bg-color);
  color: var(--md-code-fg-color);
  font-family: var(--md-code-font-family), "IBM Plex Sans Arabic", monospace;
  font-size: 0.8rem;
  line-height: 1.8;
  text-align: right;
  white-space: pre-wrap;
}

.md-typeset pre.dad-play__out.is-empty {
  color: var(--md-default-fg-color--light);
}

.dad-play__error {
  color: #C2410C;
}

[data-md-color-scheme="slate"] .dad-play__error {
  color: #F59E7A;
}

.dad-play__notice {
  color: var(--dad-gold-ink);
}

[data-md-color-scheme="slate"] .dad-play__notice {
  color: var(--dad-gold-soft);
}

@media screen and (max-width: 59.984em) {
  .dad-play__panes {
    grid-template-columns: minmax(0, 1fr);
  }

  .dad-play__code > .dad-play__editor {
    min-height: 16rem;
  }
}

/* No copy button on the playground's highlighted layer: it sits under the editor. */
.dad-play__code .md-code__nav,
.dad-play__code .md-clipboard {
  display: none;
}