/* ===========================================================================
   grat website
   ===========================================================================
   Design: warm paper, a hairline track running through it, and one terracotta
   accent. The page is light only; the terminal windows are the sole dark
   surfaces, so real output reads as something quoted rather than as the page's
   own voice.

   Every value below is a token. Anything that can be derived is derived, so a
   change moves one line and the page follows. The card geometry states an outer
   radius and a padding; the nested radius and the text inset come from those.
   =========================================================================== */

:root {
  color-scheme: light;

  /* --- Palette: light ---------------------------------------------------- */
  --paper: #faf7f2;
  --paper-raised: #ffffff;
  --paper-sunken: #f1eae0;
  --ink: #1a1713;
  --ink-muted: #6d6459;
  --rule: #e3d9cb;
  --accent: #c04a26;
  --accent-strong: #9a3a1c;
  --accent-on: #ffffff;

  /* --- grat's terminal palette ------------------------------------------
     Quoted from internal/presentation/styles.go. These belong to the tool and
     are used only inside a terminal window, so the output on this page has the
     colours it actually has. */
  --term-surface: #16181d;
  --term-chrome: #0f1115;
  --term-edge: #2a2f38;
  --term-accent: #2abef6;
  --term-project: #f5a524;
  --term-success: #38d17a;
  --term-failure: #f05d5e;
  --term-bright: #d8e0ea;
  --term-body: #9aa6b5;
  --term-detail: #8793a2;

  /* --- Derived colours ---------------------------------------------------
     A tint is the accent at a tenth of its strength, so an active element is
     never distinguished by colour alone. */
  --accent-tint: color-mix(in srgb, var(--accent) 10%, transparent);
  --accent-edge: color-mix(in srgb, var(--accent) 35%, transparent);
  --track-line: color-mix(in srgb, var(--rule) 60%, transparent);
  --shadow-card: 0 1px 2px color-mix(in srgb, var(--ink) 6%, transparent);
  --shadow-window: 0 32px 60px -40px color-mix(in srgb, var(--ink) 60%, transparent);

  /* --- Card geometry -----------------------------------------------------
     Both derivations live here, on the element that declares what they read.
     A property containing var() resolves where it is declared, so a derivation
     placed further down would come back empty. */
  --card-radius: 24px;
  --card-padding: 22px;
  --card-inner-radius: max(calc(var(--card-radius) - var(--card-padding)), 0px);
  --card-text-inset: calc(var(--card-radius) / 2);

  /* --- Measure and rhythm ------------------------------------------------- */
  --measure: 70rem;
  --gutter: 1.5rem;
  --track: 92px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* --- Type ---------------------------------------------------------------
     Code keeps a size of its own, because it is read at the size it is written
     at and must not grow when the reading scale does. */
  --font-body: "Inter", ui-sans-serif, -apple-system, "Segoe UI", system-ui, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, monospace;

  --size-display: clamp(2.5rem, 6.5vw, 4.5rem);
  --size-section: clamp(1.6rem, 3.2vw, 2.25rem);
  --size-lead: 1.3125rem;
  --size-body: 1.0625rem;
  --size-small: 0.9375rem;
  --size-label: 0.6875rem;
  --size-code: 0.8125rem; /* stays put when the reading sizes grow */

  --leading-display: 1.02;
  --leading-body: 1.65;
  --tracking-display: -0.035em;
  --tracking-label: 0.1em;

  /* --- Motion -------------------------------------------------------------- */
  --duration-quick: 130ms;
  --duration-calm: 260ms;
  --ease: cubic-bezier(0.2, 0, 0, 1);
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  color: var(--ink);
  background-color: var(--paper);
  /* The track motif: hairlines the page sits on, standing for the lanes that
     services and ports run in. Painted, not fixed-attachment, so it composites
     once instead of being repositioned on every scroll frame. */
  background-image: repeating-linear-gradient(
    to right,
    var(--track-line) 0,
    var(--track-line) 1px,
    transparent 1px,
    transparent var(--track)
  );
  font-family: var(--font-body);
  font-size: var(--size-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* --- One measure for the page --------------------------------------------- */

.measure {
  width: 100%;
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* --- Header ----------------------------------------------------------------
   A band spanning the window carries the surface and the blur; a row inside it
   is held to the page measure, so the wordmark begins where the text does. */

.band {
  position: sticky;
  top: 0;
  z-index: 20;
  background-color: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--rule);
}

.band__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  min-height: 4rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

.wordmark__glyph {
  color: var(--accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  padding: var(--space-2) var(--space-3);
  border-radius: 999px;
  color: var(--ink-muted);
  font-size: var(--size-small);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--duration-quick) var(--ease),
    background-color var(--duration-quick) var(--ease);
}

.nav__link:hover {
  color: var(--ink);
  background-color: var(--paper-sunken);
}

/* The current item carries the accent and its tint together, and hovering it
   keeps the tint rather than replacing it with the neutral one. */
.nav__link[aria-current="page"],
.nav__link[aria-current="page"]:hover {
  color: var(--accent-strong);
  background-color: var(--accent-tint);
}

.nav__icon {
  font-size: 1.125rem;
  vertical-align: -0.15em;
}

@media (max-width: 48rem) {
  .nav__link--optional {
    display: none;
  }
}

/* --- Hero ------------------------------------------------------------------ */

.hero {
  padding-block: var(--space-20) var(--space-16);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-12);
  align-items: center;
}

@media (min-width: 62rem) {
  .hero__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: var(--space-10);
  }
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--rule);
  border-radius: 999px;
  background-color: var(--paper-raised);
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: var(--size-label);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.badge__dot {
  width: 0.4375rem;
  height: 0.4375rem;
  border-radius: 999px;
  background-color: var(--term-success);
}

.hero__title {
  margin: var(--space-6) 0 0;
  font-size: var(--size-display);
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
  font-weight: 650;
}

.hero__title em {
  font-style: normal;
  color: var(--accent);
}

.hero__lead {
  margin: var(--space-6) 0 0;
  max-width: 34em;
  color: var(--ink-muted);
  font-size: var(--size-lead);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.hero__note {
  margin: var(--space-4) 0 0;
  color: var(--ink-muted);
  font-size: var(--size-small);
}

/* --- Buttons ---------------------------------------------------------------
   A button is as wide as its label. The single exception is a phone-sized
   viewport, which is the media query at the end of this block rather than a
   property of any button. */

.button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-size: var(--size-small);
  font-weight: 560;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--duration-quick) var(--ease),
    background-color var(--duration-quick) var(--ease),
    border-color var(--duration-quick) var(--ease),
    color var(--duration-quick) var(--ease);
}

.button:active {
  transform: translateY(1px);
}

.button--primary {
  background-color: var(--accent);
  color: var(--accent-on);
}

.button--primary:hover {
  background-color: var(--accent-strong);
}

.button--quiet {
  border-color: var(--rule);
  background-color: var(--paper-raised);
  color: var(--ink);
}

.button--quiet:hover {
  background-color: var(--paper-sunken);
}

@media (max-width: 30rem) {
  .hero__actions {
    display: grid;
  }
  .hero__actions .button {
    justify-content: center;
  }
}

/* --- Sections -------------------------------------------------------------- */

.section {
  padding-block: var(--space-16);
  border-top: 1px solid var(--rule);
}

.section__head {
  max-width: 46rem;
  margin-bottom: var(--space-10);
}

.section__number {
  display: block;
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--size-label);
  font-weight: 600;
  letter-spacing: var(--tracking-label);
  color: var(--accent);
}

.section__title {
  margin: 0;
  font-size: var(--size-section);
  line-height: 1.15;
  letter-spacing: -0.025em;
  font-weight: 620;
}

.section__lead {
  margin: var(--space-4) 0 0;
  color: var(--ink-muted);
  font-size: var(--size-lead);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-8);
  align-items: start;
}

@media (min-width: 62rem) {
  .split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    gap: var(--space-12);
  }
  .split--even {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

/* --- Cards ----------------------------------------------------------------- */

.card {
  padding: var(--card-padding);
  border: 1px solid var(--rule);
  border-radius: var(--card-radius);
  background-color: var(--paper-raised);
  box-shadow: var(--shadow-card);
}

/* Text inside a card meets the card's own corner, so it takes the inset on top
   of the padding. A code block or a table runs the full width and has an edge
   of its own, so it does not. */
.card__title,
.card__text {
  padding-inline: var(--card-text-inset);
}

.card__title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0 0 var(--space-2);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.card__title i {
  color: var(--accent);
  font-size: 1.375rem;
}

.card__text {
  margin: 0;
  color: var(--ink-muted);
  font-size: var(--size-small);
}

.cards {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
}

/* --- Terminal window -------------------------------------------------------
   The only dark surface on the page. Everything inside is real output from the
   built binary. */

.window {
  border-radius: var(--card-radius);
  background-color: var(--term-surface);
  border: 1px solid var(--term-edge);
  overflow: hidden;
  box-shadow: var(--shadow-window);
}

.window__chrome {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background-color: var(--term-chrome);
  border-bottom: 1px solid var(--term-edge);
}

.window__dot {
  width: 0.5625rem;
  height: 0.5625rem;
  border-radius: 999px;
  background-color: color-mix(in srgb, var(--term-detail) 40%, transparent);
}

.window__title {
  margin-left: var(--space-2);
  color: var(--term-detail);
  font-family: var(--font-mono);
  font-size: var(--size-label);
  letter-spacing: 0.05em;
}

/* The block scrolls inside itself. A pre otherwise reports its longest line as
   a minimum width, and that figure travels up and widens the page. */
.window__body {
  margin: 0;
  padding: var(--space-4) var(--space-5);
  overflow-x: auto;
  contain: inline-size;
  color: var(--term-body);
  font-family: var(--font-mono);
  font-size: var(--size-code);
  line-height: 1.75;
}

.t-title { color: var(--term-accent); font-weight: 600; }
.t-project { color: var(--term-detail); }
.t-info { color: var(--term-detail); }
.t-work { color: var(--term-accent); }
.t-ok { color: var(--term-success); }
.t-warn { color: var(--term-project); }
.t-fail { color: var(--term-failure); }
.t-head { color: var(--term-bright); font-weight: 600; }
.t-name { color: var(--term-bright); }

/* --- Command line ---------------------------------------------------------- */

.command {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-5);
  border: 1px solid var(--rule);
  border-radius: 999px;
  background-color: var(--paper-raised);
  font-family: var(--font-mono);
  font-size: var(--size-code);
}

.command__prompt {
  color: var(--accent);
  user-select: none;
}

.command__text {
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  white-space: nowrap;
}

/* A copy button is the icon alone: no border, no background. The transition
   sits on the resting state, so the confirmation arrives at once and drains
   away afterwards. */
.copy {
  margin-left: auto;
  display: inline-flex;
  padding: var(--space-1);
  border: 0;
  background: none;
  color: var(--ink-muted);
  font-size: 1.125rem;
  cursor: pointer;
  transition: color var(--duration-calm) var(--ease);
}

.copy:hover {
  color: var(--ink);
}

.copy[data-copied="true"] {
  color: var(--term-success);
  transition: none;
}

/* --- Port scale -------------------------------------------------------------
   Every role owns a port range. That is the one thing about grat which is
   quicker to see than to read. */

.scale {
  display: grid;
  gap: var(--space-2);
}

.scale__row {
  display: grid;
  grid-template-columns: 8.5rem minmax(0, 1fr);
  align-items: center;
  gap: var(--space-4);
}

.scale__role {
  font-family: var(--font-mono);
  font-size: var(--size-small);
  color: var(--ink);
  text-align: right;
}

.scale__lane {
  position: relative;
  height: 2.5rem;
  border-radius: 999px;
  background-color: var(--paper-sunken);
  border: 1px solid var(--rule);
}

.scale__span {
  position: absolute;
  inset-block: -1px;
  border: 1px solid var(--accent-edge);
  border-radius: 999px;
  background-color: var(--accent-tint);
}

/* The range is written beside its bar, because 100 ports of 2100 is far too
   narrow to hold the text. */
.scale__value {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  margin-left: var(--space-3);
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: var(--size-label);
  white-space: nowrap;
}

/* The last range sits at the right end of the lane, so its label goes to the
   left of its bar instead of past the edge. */
.scale__value--before {
  margin-left: 0;
  margin-right: var(--space-3);
  transform: translate(-100%, -50%);
}


.scale__legend {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-3);
  padding-left: calc(8.5rem + var(--space-4));
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: var(--size-label);
}

@media (max-width: 40rem) {
  .scale__row {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-1);
  }
  .scale__role {
    text-align: left;
  }
  .scale__legend {
    padding-left: 0;
  }
}

/* --- Table ------------------------------------------------------------------
   The scroll sits on the wrapper. A table reports its content width upwards and
   would widen the page. */

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: var(--card-radius);
  background-color: var(--paper-raised);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--size-small);
}

th,
td {
  padding: var(--space-3) var(--space-5);
  text-align: left;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

thead th {
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: var(--size-label);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

tbody tr:last-child td {
  border-bottom: 0;
}

td code,
th code {
  font-family: var(--font-mono);
  font-size: var(--size-code);
  color: var(--accent-strong);
}

/* --- Steps ------------------------------------------------------------------ */

.steps {
  display: grid;
  gap: var(--space-5);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  display: grid;
  grid-template-columns: 1.75rem minmax(0, 1fr);
  column-gap: var(--space-4);
  row-gap: var(--space-1);
}

.steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--size-small);
  color: var(--accent);
  line-height: var(--leading-body);
}

.steps strong {
  display: block;
  font-weight: 600;
}

.steps span {
  color: var(--ink-muted);
  font-size: var(--size-small);
}

/* The number, the title and its explanation are placed by hand: a list item is
   a grid of two columns holding three items, so leaving it to auto-placement
   wraps the explanation under the number instead of under the title. */
.steps li::before { grid-column: 1; grid-row: 1; }
.steps strong { grid-column: 2; grid-row: 1; }
.steps span { grid-column: 2; grid-row: 2; }


/* --- Footer ------------------------------------------------------------------ */

.footer {
  padding-block: var(--space-12);
  border-top: 1px solid var(--rule);
  color: var(--ink-muted);
  font-size: var(--size-small);
}

.footer__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
}

.footer a {
  color: var(--ink-muted);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}

.footer a:hover {
  color: var(--ink);
  border-bottom-color: currentColor;
}

/* --- Prose ------------------------------------------------------------------- */

.prose p {
  margin: 0 0 var(--space-4);
  color: var(--ink-muted);
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose strong {
  color: var(--ink);
  font-weight: 600;
}

.prose code,
.inline-code {
  padding: 0.12em 0.38em;
  border-radius: 0.4em;
  background-color: var(--paper-sunken);
  font-family: var(--font-mono);
  font-size: var(--size-code);
  color: var(--ink);
}

.stack {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}