/* base.css — L1 shell. Reset, page canvas, background field, top bar, footer, toast,
 * sticky save bar, entrance motion, focus, print. Values come from tokens.css only.
 */

/* ---------- [ reset ] ---------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-block-start: var(--s-24);
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

img, picture, svg, video, canvas { display: block; max-inline-size: 100%; }
img { block-size: auto; }

input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
button:disabled { cursor: not-allowed; }

h1, h2, h3, h4 { text-wrap: balance; font-weight: var(--fw-regular); }
p, li, dd, figcaption { text-wrap: pretty; }

ul[class], ol[class] { list-style: none; padding: 0; }

a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .2em; }

[hidden] { display: none !important; }

/* ---------- [ canvas ] --------------------------------------------------------- */
body {
  position: relative;
  min-block-size: 100vh;
  min-block-size: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: var(--fs-16);
  font-weight: var(--fw-regular);
  line-height: var(--lh-body);
  font-feature-settings: "ss01", "cv11";
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

@supports (overflow: clip) {
  body { overflow-x: clip; }
}

::selection { background: var(--c-ink); color: var(--c-bg); }

/* global focus ring: one rule, every interactive element */
:focus:not(:focus-visible) { outline: none; }
:focus-visible {
  outline: 2px solid var(--c-focus);
  outline-offset: 3px;
}

/* ---------- [ utilities ] ------------------------------------------------------ */
.mono {
  font-family: var(--font-mono);
  font-feature-settings: normal;
  font-variant-numeric: tabular-nums;
}

.label {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: var(--fw-regular);
  line-height: var(--lh-snug);
  letter-spacing: var(--tracking-label);
  color: var(--c-ink-2);
  white-space: nowrap;
}

.visually-hidden {
  position: absolute !important;
  inline-size: 1px; block-size: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: fixed;
  inset-block-start: var(--s-12);
  inset-inline-start: var(--s-12);
  z-index: var(--z-consent);
  display: inline-flex;
  align-items: center;
  min-block-size: var(--tap);
  padding-inline: var(--s-16);
  border-radius: var(--r-pill);
  background: var(--c-ink);
  color: var(--c-on-ink);
  font-size: var(--fs-14);
  text-decoration: none;
  transform: translateY(calc(-100% - var(--s-24)));
  transition: transform var(--t-mid) var(--ease-out);
}
.skip-link:focus,
.skip-link:focus-visible { transform: none; }

/* ---------- [ background: one colour, slightly blurred ] ----------------------- */
.bg {
  position: fixed;
  inset: 0;
  z-index: var(--z-bg);
  overflow: hidden;
  pointer-events: none;
  contain: strict;
}

.bg__field {
  position: absolute;
  inline-size: 72vmax;
  block-size: 72vmax;
  border-radius: 50%;
  filter: blur(90px);
  will-change: transform;
  animation: bg-drift-a 52s var(--ease-in-out) infinite alternate;
}

.bg__field--a {
  inset-block-start: -28vmax;
  inset-inline-end: -22vmax;
  background: rgba(0, 165, 255, .16);
}

.bg__field--b {
  inline-size: 64vmax;
  block-size: 64vmax;
  inset-block-end: -30vmax;
  inset-inline-start: -24vmax;
  background: rgba(175, 255, 111, .18);
  animation: bg-drift-b 46s var(--ease-in-out) infinite alternate;
}

.bg__grain {
  position: absolute;
  inset: 0;
  opacity: .035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px 160px;
}

@keyframes bg-drift-a {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(-9vmax, 7vmax, 0) scale(1.08); }
}
@keyframes bg-drift-b {
  from { transform: translate3d(0, 0, 0) scale(1.04); }
  to   { transform: translate3d(8vmax, -6vmax, 0) scale(.96); }
}

/* ---------- [ top bar ] -------------------------------------------------------- */
.topbar {
  position: relative;
  z-index: var(--z-content);
  inline-size: 100%;
  max-inline-size: calc(var(--w-max) + 2 * var(--gutter));
  margin-inline: auto;
  padding-block: var(--s-16);
  padding-inline: var(--gutter);
  padding-block-start: max(var(--s-16), env(safe-area-inset-top));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-16);
}

.topbar__brand {
  display: inline-flex;
  align-items: center;
  min-block-size: var(--tap);
  border-radius: var(--s-4);
}
.topbar__brand img {
  block-size: 20px;
  inline-size: auto;
}

.topbar__meta {
  display: flex;
  align-items: center;
  gap: var(--s-16);
}
/* the domain annotation is decoration; give the toggle the room on small phones */
.topbar__meta .label { display: none; }
@media (min-width: 560px) {
  .topbar__meta .label { display: inline; }
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--s-8);
  min-block-size: var(--tap);
  min-inline-size: var(--tap);
  padding-inline: var(--s-16);
  border: var(--hairline-soft);
  border-radius: var(--r-pill);
  background: color-mix(in srgb, var(--c-surface) 60%, transparent);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: var(--tracking-label);
  color: var(--c-ink-2);
  transition: border-color var(--t-fast) var(--ease-out), transform var(--t-fast) var(--ease-out);
}
@supports not (background: color-mix(in srgb, red 50%, transparent)) {
  .lang-toggle { background: var(--c-surface); }
}
.lang-toggle [data-lang] { color: var(--c-ink-2); transition: color var(--t-fast) var(--ease-out); }
.lang-toggle [data-lang][aria-current="true"] { color: var(--c-ink); font-weight: var(--fw-medium); }
.lang-toggle__sep { color: var(--c-ink-2); }
.lang-toggle:active { transform: scale(.97); }
@media (hover: hover) {
  .lang-toggle:hover { border-color: var(--c-line); }
}

/* ---------- [ page container ] ------------------------------------------------- */
.page {
  position: relative;
  z-index: var(--z-content);
  flex: 1 0 auto;
  inline-size: 100%;
  max-inline-size: calc(var(--w-max) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-block: var(--s-8) var(--s-64);
  display: flex;
  flex-direction: column;
  gap: var(--s-48);
}
@media (min-width: 760px) {
  .page { gap: var(--s-64); padding-block: var(--s-24) var(--s-96); }
}

/* ---------- [ footer ] --------------------------------------------------------- */
.footer {
  position: relative;
  z-index: var(--z-content);
  inline-size: 100%;
  max-inline-size: calc(var(--w-max) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-block: var(--s-24) max(var(--s-32), env(safe-area-inset-bottom));
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--s-16) var(--s-32);
  font-size: var(--fs-12);
  line-height: var(--lh-body);
  color: var(--c-ink-2);
}
.footer::before {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline: var(--gutter);
  border-block-start: var(--hairline-soft);
}
.footer__addr strong { color: var(--c-ink); font-weight: var(--fw-medium); }

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  column-gap: var(--s-16);
  margin-inline-start: calc(-1 * var(--s-8));
}
.footer__nav a,
.linklike {
  display: inline-flex;
  align-items: center;
  min-block-size: var(--tap);
  padding-inline: var(--s-8);
  border-radius: var(--s-4);
  font-size: var(--fs-12);
  color: var(--c-ink-2);
  text-decoration: underline;
  text-decoration-color: var(--c-line-soft);
  text-underline-offset: .25em;
  transition: color var(--t-fast) var(--ease-out), text-decoration-color var(--t-fast) var(--ease-out);
}
.linklike { background: none; border: 0; cursor: pointer; }
@media (hover: hover) {
  .footer__nav a:hover,
  .linklike:hover { color: var(--c-ink); text-decoration-color: currentColor; }
}
@media (min-width: 760px) {
  .footer__nav { margin-inline-start: 0; margin-inline-end: calc(-1 * var(--s-8)); }
}

/* ---------- [ toast ] ---------------------------------------------------------- */
.toast {
  position: fixed;
  /* both insets + auto margins centre a fit-content box; a 50% start inset would cap its width at 50vw */
  inset-inline: 0;
  inset-block-end: calc(var(--s-24) + env(safe-area-inset-bottom));
  z-index: var(--z-toast);
  display: flex;
  align-items: center;
  gap: var(--s-12);
  inline-size: max-content;
  max-inline-size: min(calc(100vw - 2 * var(--s-16)), 420px);
  margin-inline: auto;
  min-block-size: var(--tap);
  padding: var(--s-12) var(--s-24) var(--s-12) var(--s-16);
  border-radius: var(--r-pill);
  background: var(--c-ink);
  color: var(--c-on-ink);
  font-size: var(--fs-14);
  line-height: var(--lh-snug);
  box-shadow: var(--shadow-lift);
  opacity: 0;
  transform: translate3d(0, 12px, 0) scale(.98);
  transition: opacity var(--t-mid) var(--ease-out), transform var(--t-mid) var(--ease-out);
  pointer-events: none;
}
.toast::before {
  content: "";
  flex: none;
  inline-size: 8px;
  block-size: 8px;
  border-radius: 2px;
  background: var(--c-signal);
}
.toast[data-kind="error"]::before { background: var(--c-danger); box-shadow: 0 0 0 2px var(--c-on-ink); }
.toast.is-visible { opacity: 1; transform: none; pointer-events: auto; }
/* lift the toast above the sticky save bar */
html.has-sticky .toast { inset-block-end: calc(88px + env(safe-area-inset-bottom)); }

/* ---------- [ sticky save bar: mobile only ] ----------------------------------- */
.sticky-save {
  position: fixed;
  inset-inline: 0;
  inset-block-end: 0;
  z-index: var(--z-sticky);
  padding: var(--s-12) var(--gutter) max(var(--s-12), env(safe-area-inset-bottom));
  background: color-mix(in srgb, var(--c-bg) 82%, transparent);
  border-block-start: var(--hairline-soft);
  transform: translateY(100%);
  opacity: 0;
  transition: transform var(--t-slow) var(--ease-out), opacity var(--t-mid) var(--ease-out);
}
@supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .sticky-save {
    -webkit-backdrop-filter: saturate(1.4) blur(14px);
    backdrop-filter: saturate(1.4) blur(14px);
  }
}
@supports not (background: color-mix(in srgb, red 50%, transparent)) {
  .sticky-save { background: rgba(12, 26, 38, .92); }
}
.sticky-save.is-visible { transform: none; opacity: 1; }
@media (min-width: 760px) {
  .sticky-save { display: none !important; }
}
html.has-sticky body { padding-block-end: 80px; }
@media (min-width: 760px) {
  html.has-sticky body { padding-block-end: 0; }
}

/* ---------- [ dialog lock ] ---------------------------------------------------- */
html.has-dialog body { overflow: hidden; }
@supports selector(:has(*)) {
  html:has(dialog[open]) body { overflow: hidden; }
}

/* ---------- [ entrance motion ] ------------------------------------------------ */
/* JS adds html.is-ready as soon as ui.js runs; without JS everything is simply visible. */
@keyframes rise-in {
  from { opacity: 0; transform: translate3d(0, 10px, 0); }
  to   { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: no-preference) {
  html.is-ready .topbar,
  html.is-ready .panel,
  html.is-ready .spec,
  html.is-ready .band,
  html.is-ready .footer {
    /* backwards (not both): once finished, no transform lingers to create stacking contexts */
    animation: rise-in var(--t-slow) var(--ease-out) backwards;
  }
  html.is-ready .panel  { animation-delay: 60ms; }
  html.is-ready .spec   { animation-delay: 140ms; }
  html.is-ready .band   { animation-delay: 200ms; }
  html.is-ready .footer { animation-delay: 240ms; }
}

/* ---------- [ reduced motion ] ------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .bg__field { animation: none; will-change: auto; }
  html.is-ready .topbar,
  html.is-ready .panel,
  html.is-ready .spec,
  html.is-ready .band,
  html.is-ready .footer { animation: none; }
  .sticky-save,
  .toast { transition-duration: 1ms; }
}

/* ---------- [ print ] ---------------------------------------------------------- */
@media print {
  @page { margin: 14mm; }
  html, body { background: #ffffff !important; color: #000; }
  body { display: block; padding: 0 !important; }
  .bg,
  .skip-link,
  .lang-toggle,
  .sticky-save,
  .toast,
  .consent,
  .tools,
  .linklike,
  dialog { display: none !important; }
  .topbar, .page, .footer { max-inline-size: none; padding-inline: 0; }
  html.is-ready .topbar,
  html.is-ready .panel,
  html.is-ready .spec,
  html.is-ready .band,
  html.is-ready .footer { animation: none !important; opacity: 1 !important; transform: none !important; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 9pt; color: #444; }
  .topbar__brand::after, .action::after { content: none !important; }
  .panel, .spec, .band { break-inside: avoid; box-shadow: none !important; }
}