/* ==========================================================================
   Tuna AG – Gemeinsames Design-System v1.0
   Gilt für www.[domain] (Tuna AG) und ma.[domain] (Tuna AG | M&A).
   Beide Seiten binden dieselbe Datei ein; jede Seite wird separat deployt.
   ========================================================================== */

/* ---------- 1. Schrift (selbst gehostet, keine Drittanbieter-Anfrage) ---- */
/* @font-face wird beim Build eingesetzt. Produktion: /assets/fonts/inter-latin-wght-normal.woff2 */
@font-face { font-family: "Inter"; font-style: normal; font-weight: 100 900; font-display: swap;
  src: url("fonts/inter-latin-wght-normal.woff2") format("woff2"); }

/* ---------- 2. Tokens ---------------------------------------------------- */
:root {
  /* Farben */
  --c-white: #FFFFFF;
  --c-fog: #F4F5F6;          /* Nebelgrau – ruhige Flächen */
  --c-line: #DCE0E4;         /* Linien, Rahmen */
  --c-ink: #0F2132;          /* Nachtblau – Text und dunkle Flächen */
  --c-ink-2: #1D3347;        /* Nachtblau, Hover */
  --c-slate: #3C4A58;        /* Schiefer – Fliesstext sekundär */
  --c-grey: #5F6974;         /* Grau – Metadaten */
  --c-accent: #2E6E66;       /* Seegrün – AKZENT = Logo-Farbe (Platzhalter) */
  --c-accent-light: #8CC7BD; /* Akzent auf dunklem Grund */
  --c-accent-tint: #E5EFED;  /* Akzent als Fläche */

  /* Kontextvariablen (werden von dunklen Flächen überschrieben) */
  --fg: var(--c-ink);
  --fg-2: var(--c-slate);
  --fg-3: var(--c-grey);
  --line: var(--c-line);
  --surface: var(--c-fog);
  --accent: var(--c-accent);

  /* Typografie */
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --fs-display: clamp(2.75rem, 1.2rem + 6.4vw, 6.5rem);
  --fs-h2: clamp(2rem, 1.35rem + 2.6vw, 3.5rem);
  --fs-h3: clamp(1.25rem, 1.12rem + 0.55vw, 1.625rem);
  --fs-lead: clamp(1.125rem, 1.03rem + 0.45vw, 1.375rem);
  --fs-body: 1.0625rem;
  --fs-small: 0.9375rem;
  --fs-xs: 0.8125rem;

  /* Abstände (Basis 4 px) */
  --s-1: 0.25rem; --s-2: 0.5rem; --s-3: 0.75rem; --s-4: 1rem; --s-5: 1.5rem;
  --s-6: 2rem; --s-7: 2.5rem; --s-8: 3rem; --s-9: 4rem; --s-10: 5rem; --s-11: 7rem;
  --section-y: clamp(5rem, 3rem + 8vw, 10rem);
  --gutter: clamp(1.25rem, 0.7rem + 2.6vw, 3rem);
  --container: 1240px;

  /* Radien nach Hierarchie: Bild > Fläche > Feld > Button */
  --r-image: 28px;
  --r-tile: 20px;
  --r-field: 12px;
  --r-pill: 999px;

  /* Bewegung */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  --header-h: 68px;
}

/* ---------- 3. Basis ----------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--header-h) + 1rem); }
body {
  margin: 0;
  font-family: var(--font);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--fg);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: var(--s-4); top: -200px; z-index: 100;
  padding: 0.7rem 1.1rem; border-radius: var(--r-field);
  background: var(--c-ink); color: #fff; text-decoration: none;
}
.skip-link:focus { top: var(--s-3); }

/* ---------- 4. Typografie ------------------------------------------------ */
.display {
  font-size: var(--fs-display);
  font-weight: 600;
  line-height: 0.98;
  letter-spacing: -0.045em;
  text-wrap: balance;
}
.h2 {
  font-size: var(--fs-h2);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -0.035em;
  text-wrap: balance;
}
.h3 {
  font-size: var(--fs-h3);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.lead {
  font-size: var(--fs-lead);
  line-height: 1.5;
  letter-spacing: -0.012em;
  color: var(--fg-2);
  max-width: 34em;
}
.text-2 { color: var(--fg-2); }
.text-3 { color: var(--fg-3); }
.small { font-size: var(--fs-small); }
.kicker { /* Bereichsname – nur wo er Orientierung gibt, nie in Versalien */
  display: block;
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--accent);
  margin-bottom: var(--s-4);
}

/* ---------- 5. Layout ---------------------------------------------------- */
.container {
  width: 100%;
  max-width: calc(var(--container) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: var(--section-y); }
.section--fog { background: var(--c-fog); --surface: var(--c-white); }
.section--ink,
.panel {
  background: var(--c-ink);
  color: #fff;
  --fg: #fff;
  --fg-2: rgba(255, 255, 255, 0.76);
  --fg-3: rgba(255, 255, 255, 0.6);
  --line: rgba(255, 255, 255, 0.16);
  --surface: rgba(255, 255, 255, 0.06);
  --accent: var(--c-accent-light);
}
.section-head { max-width: 46rem; margin-bottom: clamp(2.5rem, 1.6rem + 3.4vw, 5rem); }
.section-head .lead { margin-top: var(--s-5); }

/* Zweispaltiger Kopf: Titel links, Text rechts (ab Desktop) */
.split-head { display: grid; gap: var(--s-5); margin-bottom: clamp(2.5rem, 1.6rem + 3.4vw, 5rem); }
@media (min-width: 960px) {
  .split-head { grid-template-columns: 7fr 5fr; gap: var(--s-9); align-items: end; }
}

.grid { display: grid; gap: clamp(1rem, 0.6rem + 1.2vw, 1.5rem); }
@media (min-width: 720px) { .grid--2, .grid--4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .grid--3 { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1100px) { .grid--4 { grid-template-columns: repeat(4, 1fr); } }

/* ---------- 6. Buttons & Links ------------------------------------------ */
.btn {
  --btn-bg: var(--c-ink); --btn-fg: #fff; --btn-bd: var(--c-ink);
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5em;
  min-height: 50px; padding: 0.8rem 1.6rem;
  border: 1px solid var(--btn-bd); border-radius: var(--r-pill);
  background: var(--btn-bg); color: var(--btn-fg);
  font: inherit; font-size: 1rem; font-weight: 500; letter-spacing: -0.01em;
  text-decoration: none; text-align: center; cursor: pointer;
  transition: background-color 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease), transform 0.2s var(--ease);
}
.btn:hover { --btn-bg: var(--c-ink-2); --btn-bd: var(--c-ink-2); }
.btn:active { transform: scale(0.98); }
.btn--secondary { --btn-bg: transparent; --btn-fg: var(--c-ink); --btn-bd: var(--c-line); }
.btn--secondary:hover { --btn-bg: transparent; --btn-bd: var(--c-ink); }
.btn--light { --btn-bg: #fff; --btn-fg: var(--c-ink); --btn-bd: #fff; }
.btn--light:hover { --btn-bg: var(--c-fog); --btn-bd: var(--c-fog); }
.btn--outline-light { --btn-bg: transparent; --btn-fg: #fff; --btn-bd: rgba(255, 255, 255, 0.38); }
.btn--outline-light:hover { --btn-bg: transparent; --btn-bd: #fff; }
.btn--sm { min-height: 40px; padding: 0.45rem 1.1rem; font-size: 0.9375rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: var(--s-3); }
@media (max-width: 559.98px) { .btn-row--stack .btn { width: 100%; } }

.link {
  color: var(--accent);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.3em;
  text-decoration-color: color-mix(in srgb, currentColor 35%, transparent);
  transition: text-decoration-color 0.2s var(--ease);
}
.link:hover { text-decoration-color: currentColor; }

/* ---------- 7. Header & Navigation -------------------------------------- */
.site-header { position: sticky; top: 0; z-index: 50; height: var(--header-h); }
/* Unschärfe auf Pseudo-Element, damit das mobile Menü (position: fixed) korrekt sitzt */
.site-header::before {
  content: ""; position: absolute; inset: 0;
  background: rgba(255, 255, 255, 0.8);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}
.site-header.is-scrolled::before { border-bottom-color: var(--c-line); }
.site-header__inner {
  position: relative; height: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-5);
}

/* Wortmarke – Platzhalter, bis das Logo als SVG vorliegt */
.logo { display: inline-flex; align-items: center; gap: 0.7rem; white-space: nowrap; color: var(--c-ink); text-decoration: none; }
.logo a { text-decoration: none; }
.logo__word { font-size: 1.1875rem; font-weight: 650; letter-spacing: -0.03em; }
.logo__word span { font-weight: 400; color: var(--c-grey); }
.logo__rule { width: 1px; height: 1.25rem; background: var(--c-line); }
.logo__unit { font-size: 1.1875rem; font-weight: 500; letter-spacing: -0.02em; color: var(--c-accent); text-decoration: none; }
.panel .logo, .section--ink .logo { color: #fff; }

.nav { display: flex; align-items: center; gap: var(--s-7); }
.nav__list { display: flex; gap: var(--s-5); list-style: none; padding: 0; }
.nav__link { font-size: var(--fs-small); color: var(--c-slate); text-decoration: none; transition: color 0.2s var(--ease); }
.nav__link:hover, .nav__link[aria-current="page"] { color: var(--c-ink); }

.nav-toggle { display: none; }

@media (max-width: 1023.98px) {
  .nav-toggle {
    display: inline-grid; place-items: center; width: 44px; height: 44px; margin-right: -10px;
    border: 0; border-radius: var(--r-field); background: transparent; color: var(--c-ink); cursor: pointer;
  }
  .nav-toggle__bars { position: relative; width: 20px; height: 12px; }
  .nav-toggle__bars::before, .nav-toggle__bars::after {
    content: ""; position: absolute; left: 0; right: 0; height: 1.5px; border-radius: 2px; background: currentColor;
    transition: transform 0.3s var(--ease), top 0.3s var(--ease);
  }
  .nav-toggle__bars::before { top: 2px; }
  .nav-toggle__bars::after { top: 9px; }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 5.25px; transform: rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 5.25px; transform: rotate(-45deg); }

  .nav {
    position: fixed; inset: var(--header-h) 0 0 0;
    flex-direction: column; align-items: stretch; gap: var(--s-7);
    padding: var(--s-5) var(--gutter) var(--s-9);
    background: var(--c-white); overflow-y: auto;
    opacity: 0; visibility: hidden; transform: translateY(-6px);
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0s linear 0.3s;
  }
  .site-header[data-open="true"] .nav {
    opacity: 1; visibility: visible; transform: none;
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0s;
  }
  .site-header[data-open="true"]::before { background: var(--c-white); }
  .nav__list { flex-direction: column; gap: 0; }
  .nav__list li { border-bottom: 1px solid var(--c-line); }
  .nav__link { display: block; padding: 1.05rem 0; font-size: 1.5rem; font-weight: 600; letter-spacing: -0.025em; color: var(--c-ink); }
  .nav .btn { align-self: stretch; min-height: 52px; font-size: 1rem; }
}

/* ---------- 8. Flächen --------------------------------------------------- */
.tile {
  display: flex; flex-direction: column; gap: var(--s-3);
  padding: clamp(1.5rem, 1.1rem + 1.4vw, 2.25rem);
  border-radius: var(--r-tile);
  background: var(--surface);
}
.tile p { color: var(--fg-2); }
.panel { border-radius: var(--r-image); padding: clamp(2rem, 1rem + 5vw, 5.5rem); overflow: hidden; }

/* Index-Liste: ruhige Alternative zu Kachelrastern (Leistungen, Grundsätze) */
.index { list-style: none; padding: 0; border-top: 1px solid var(--line); }
.index__item {
  display: grid; gap: var(--s-3);
  padding-block: clamp(1.5rem, 1.1rem + 1.4vw, 2.5rem);
  border-bottom: 1px solid var(--line);
}
.index__item p { color: var(--fg-2); max-width: 36em; }
@media (min-width: 900px) {
  .index__item { grid-template-columns: 5fr 6fr 2fr; gap: var(--s-8); align-items: baseline; }
  .index__item .link { justify-self: end; }
}

/* Grundsätze: Linie oben, Titel, Text */
.principle { display: grid; gap: var(--s-3); align-content: start; padding-top: var(--s-5); border-top: 1px solid var(--line); }
.principle p { color: var(--fg-2); }

/* Prozess (echte Abfolge → Nummerierung) */
.steps { list-style: none; padding: 0; display: grid; counter-reset: step; }
.step {
  counter-increment: step;
  display: grid; grid-template-columns: 3.25rem 1fr; gap: var(--s-4);
  padding-block: var(--s-5);
  border-top: 1px solid var(--line);
}
.step::before {
  content: counter(step);
  font-size: var(--fs-small); font-weight: 600; font-variant-numeric: tabular-nums;
  color: var(--accent); padding-top: 0.2em;
}
.step__title { font-size: 1.125rem; font-weight: 600; letter-spacing: -0.015em; line-height: 1.35; }
.step__text { margin-top: var(--s-1); font-size: var(--fs-small); color: var(--fg-2); }
@media (min-width: 720px) { .steps { grid-template-columns: repeat(2, 1fr); column-gap: var(--s-8); } }
@media (min-width: 1100px) {
  .steps { grid-template-columns: repeat(3, 1fr); }
  .step { grid-template-columns: 1fr; gap: var(--s-4); padding-block: var(--s-6) var(--s-7); }
}

/* ---------- 9. Formular -------------------------------------------------- */
.field { display: grid; gap: var(--s-2); }
.label { font-size: var(--fs-small); font-weight: 500; }
.input {
  width: 100%; min-height: 52px; padding: 0.85rem 1rem;
  border: 1px solid var(--c-line); border-radius: var(--r-field);
  background: var(--c-white); color: var(--c-ink); font: inherit;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.input::placeholder { color: #7D8590; }
.input:hover { border-color: #B8BFC7; }
.input:focus { outline: none; border-color: var(--c-ink); box-shadow: 0 0 0 4px rgba(15, 33, 50, 0.08); }
textarea.input { min-height: 150px; resize: vertical; }
.hint { font-size: var(--fs-xs); color: var(--fg-3); }

.choices { display: grid; gap: var(--s-3); border: 0; padding: 0; margin: 0; }
@media (min-width: 720px) { .choices { grid-template-columns: 1fr 1fr; } }
.choice input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.choice label {
  display: grid; grid-template-columns: 20px 1fr; gap: var(--s-3); align-items: start;
  padding: var(--s-5); border: 1px solid var(--c-line); border-radius: var(--r-field);
  background: var(--c-white); cursor: pointer; transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.choice label::before {
  content: ""; width: 20px; height: 20px; margin-top: 2px; border-radius: 50%;
  border: 1.5px solid #9AA2AB; transition: border 0.2s var(--ease);
}
.choice input:checked + label { border-color: var(--c-ink); box-shadow: inset 0 0 0 1px var(--c-ink); }
.choice input:checked + label::before { border: 6px solid var(--c-ink); }
.choice input:focus-visible + label { outline: 2px solid var(--c-accent); outline-offset: 3px; }
.choice strong { display: block; font-weight: 600; }
.choice small { display: block; margin-top: 2px; font-size: var(--fs-small); color: var(--c-grey); }

/* ---------- 10. Footer --------------------------------------------------- */
.site-footer { padding-block: var(--s-10) var(--s-7); border-top: 1px solid var(--c-line); font-size: var(--fs-small); color: var(--c-grey); }
.site-footer__grid { display: grid; gap: var(--s-8); }
@media (min-width: 800px) { .site-footer__grid { grid-template-columns: 2fr 1fr 1fr; } }
.site-footer__title { font-size: var(--fs-small); font-weight: 600; color: var(--c-ink); margin-bottom: var(--s-4); }
.site-footer ul { list-style: none; padding: 0; display: grid; gap: var(--s-2); }
.site-footer a { color: var(--c-slate); text-decoration: none; }
.site-footer a:hover { color: var(--c-ink); text-decoration: underline; text-underline-offset: 0.25em; }
.site-footer address { font-style: normal; line-height: 1.7; }
.site-footer__bottom {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--s-4);
  margin-top: var(--s-9); padding-top: var(--s-5); border-top: 1px solid var(--c-line);
}
.site-footer .site-footer__legal { display: flex; flex-wrap: wrap; gap: var(--s-5); }

/* ---------- 11. Bewegung ------------------------------------------------- */
/* Sanftes Einblenden – sparsam: nur Abschnittsköpfe und einzelne Bilder */
.js .reveal { opacity: 0; transform: translateY(20px); transition: opacity 1.1s var(--ease-out), transform 1.1s var(--ease-out); transition-delay: var(--delay, 0s); }
.js .reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; transition-delay: 0s !important; animation-duration: 0.01ms !important; animation-delay: 0s !important; }
  .js .reveal { opacity: 1; transform: none; }
}

/* ---------- 12. Schalter: M&A-Verweise auf der Hauptseite --------------- */
/* <html data-ma="off"> blendet Menüpunkt, Teaser und Footer-Link aus. */
[data-ma="off"] [data-feature="ma"] { display: none !important; }