/* =========================================================================
   BASE — Schriften, Reset, Typografie, wiederkehrende Bausteine
   ========================================================================= */

/* ------------------------------------------------------------- fonts ---- */
/* Alle self-hosted, alle SIL OFL. Eine Familie pro Rolle.
   IBM Plex Mono kommt aus assets/shared/tokens.css.

   Outfit ist gepatcht: die Originaldatei enthält kein U+1ECD (ọ). Die Glyphe
   wird in tools/studio-omo/build-fonts.py aus o + dotaccent zusammengesetzt,
   sonst steht im Markennamen ein Tofu-Kästchen. */

@font-face {
  font-family: "Outfit";
  src: url("../fonts/outfit-var.woff2") format("woff2-variations");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Inter";
  src: url("../fonts/inter-var.woff2") format("woff2-variations");
  font-weight: 300 600;
  font-style: normal;
  font-display: swap;
}

/* ------------------------------------------------------------- reset ---- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  font-weight: 350;
  line-height: 1.55;
  letter-spacing: 0.005em;
  overflow-x: hidden;
  font-synthesis-weight: none;
  text-rendering: optimizeLegibility;
}

img,
video,
canvas {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
h4,
p,
figure,
ul,
ol,
dl,
dd {
  margin: 0;
}

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

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

:focus-visible {
  outline: var(--hair) solid var(--fg);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --------------------------------------------------------- bausteine ---- */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--bg);
  color: var(--fg);
  padding: var(--sp-2) var(--sp-4);
  font-family: var(--font-mono);
  font-size: var(--mono-size);
  letter-spacing: var(--mono-track);
  text-transform: uppercase;
}

.skip-link:focus {
  left: var(--gutter);
  top: var(--sp-2);
}

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

.mono {
  font-family: var(--font-mono);
  font-size: var(--mono-size);
  font-weight: 400;
  letter-spacing: var(--mono-track);
  text-transform: uppercase;
  line-height: 1.7;
  color: var(--fg-dim);
}

.mono--lg {
  font-size: var(--step--1);
}

/* Der Markenname wird nie in Versalien gesetzt — auch nicht in Mono-Zeilen.
   Bleibt bei Gewicht 400: Plex Mono liefert das Vietnamese-Subset mit ọ
   nur in 400, ein 500er ọ würde auf eine Ersatzschrift fallen. */
.mono--brand {
  text-transform: none;
  letter-spacing: 0.08em;
  font-weight: 400;
}

.body {
  max-width: var(--measure);
  color: var(--fg-dim);
}

.body + .body {
  margin-top: var(--sp-2);
}

/* Sichtbare Markierung für Material und Zitate, die noch offen sind. */
.todo {
  display: inline-block;
  margin-top: var(--sp-2);
  padding: 0.3rem 0.55rem;
  border: var(--hair) dashed var(--line);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-mute);
}

.shell {
  max-width: calc(var(--container) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page {
  padding-left: var(--rail);
}

/* ---------------------------------------------------------- lichtbar ---- */
/* 2 px am linken Viewport-Rand. Das ist Licht, nicht UI — deshalb darf sie
   die Lichtfarbe der Sektion annehmen, in der man gerade steht. */

.lightbar {
  position: fixed;
  inset-block: 0;
  left: 0;
  width: 2px;
  z-index: 40;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    var(--light) 12%,
    var(--light) 88%,
    transparent 100%
  );
  opacity: 0.55;
  transition: background var(--dur-3) var(--ease-out);
  pointer-events: none;
}

/* -------------------------------------------------------------- rail ---- */
/* Vertikale Mono-Spalte statt Burger-Menü. Bezug: das Programm-Poster 2023. */

.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail);
  z-index: 30;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.9rem;
  padding: var(--sp-4) 0 var(--sp-4) 1.25rem;
  border-right: var(--hair) solid var(--line-soft);
  background: var(--bg);
}

.rail a {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-mute);
  transition: color var(--dur-1) var(--ease-out);
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.rail a::before {
  content: "";
  width: 6px;
  height: var(--hair);
  background: currentColor;
  flex: none;
  transform: translateY(-0.28em);
  transition: width var(--dur-1) var(--ease-out);
}

.rail a:hover,
.rail a:focus-visible,
.rail a[aria-current="true"] {
  color: var(--fg);
}

.rail a:hover::before,
.rail a[aria-current="true"]::before {
  width: 14px;
}

@media (max-width: 56.25rem) {
  .rail {
    top: auto;
    width: 100%;
    height: auto;
    flex-direction: row;
    justify-content: flex-start;
    gap: 1.25rem;
    padding: 0.75rem var(--gutter);
    border-right: 0;
    border-top: var(--hair) solid var(--line-soft);
    overflow-x: auto;
    scrollbar-width: none;
    background: rgb(10 10 10 / 0.94);
    backdrop-filter: blur(6px);
  }

  .rail::-webkit-scrollbar {
    display: none;
  }

  .rail a::before {
    display: none;
  }
}

/* -------------------------------------------------------------- lang ---- */

.lang {
  position: fixed;
  top: var(--sp-2);
  right: var(--gutter);
  z-index: 35;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--mono-size);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.lang button {
  appearance: none;
  background: none;
  border: 0;
  padding: 0.35rem 0.15rem;
  font: inherit;
  letter-spacing: inherit;
  color: var(--fg-mute);
  cursor: pointer;
  transition: color var(--dur-1) var(--ease-out);
}

.lang button[aria-pressed="true"],
.lang button:hover {
  color: var(--fg);
}

.lang span {
  color: var(--fg-ghost);
}

/* ------------------------------------------------------------- grain ---- */
/* Signatur, 3 %, abschaltbar — wie auf den Schwester-Seiten. */

.grain {
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

html[data-grain="off"] .grain {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .grain {
    display: none;
  }
}

.grain-toggle {
  position: fixed;
  right: var(--gutter);
  bottom: var(--sp-2);
  z-index: 35;
  appearance: none;
  background: none;
  border: 0;
  padding: 0.4rem 0;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-ghost);
  cursor: pointer;
  transition: color var(--dur-1) var(--ease-out);
}

.grain-toggle:hover {
  color: var(--fg-dim);
}

@media (max-width: 56.25rem) {
  .grain-toggle {
    display: none;
  }
}

/* ------------------------------------------------------------ reveal ---- */
/* reveal() aus assets/shared/scroll.js setzt .is-in und --rd (Stagger).
   Zeilenweises Aufdecken per clip-path, kein fade-in-up auf allem. */

[data-reveal] {
  clip-path: inset(0 0 100% 0);
  opacity: 0;
  transition: clip-path var(--dur-3) var(--ease-out), opacity var(--dur-2) linear;
  transition-delay: var(--rd, 0ms);
}

[data-reveal].is-in {
  clip-path: inset(0 0 -10% 0);
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    clip-path: none;
    opacity: 1;
    transition: none;
  }
}