/* ==========================================================================
   GST Ingenieure GmbH – Coming Soon
   ========================================================================== */

:root {
  --color-bg: #000000;
  --color-text: #ffffff;
  --color-accent: #f28c1e;
  --color-accent-hover: #ffa63f;
  --color-muted: #808080;
  --video-dim: 0.6;

  /* Archivo (Omnibus-Type, SIL Open Font License) – selbst gehostet in /fonts */
  --font-headline: "Archivo", "Arial Narrow", Helvetica, Arial, sans-serif;
  --font-body: "Archivo", Helvetica, Arial, sans-serif;
  /* Variable-Font-Achsen: wght 100–900, wdth 62–125 (Condensed = 75 %) */
  --headline-width: 75%;

  --max-width: 1200px;
  --gutter: clamp(20px, 6vw, 120px);
}

@font-face {
  font-family: "Archivo";
  src: url("../fonts/Archivo-Variable.woff2") format("woff2") tech(variations),
       url("../fonts/Archivo-Variable.woff2") format("woff2-variations");
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-style: normal;
  font-display: swap;
}

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

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 300;
  font-size: clamp(16px, 1.1vw + 10px, 19px);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover,
a:focus-visible {
  color: var(--color-accent-hover);
}

a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

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

main,
.site-header,
.site-footer {
  position: relative;
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* --------------------------------------------------------------------------
   Hintergrundvideo
   -------------------------------------------------------------------------- */

.bg-video {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: var(--color-bg);
}

.bg-video__media {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Schwarze Abdunklung über dem Video – Stärke über --video-dim in :root */
.bg-video::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgb(0 0 0 / var(--video-dim));
}

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

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.site-header {
  padding-block: clamp(40px, 6vw, 90px) 0;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 0.15em;
}

.brand:hover,
.brand:focus-visible {
  color: inherit;
}

.brand__name {
  font-family: var(--font-headline);
  font-weight: 700;
  font-stretch: var(--headline-width);
  font-size: clamp(34px, 5vw, 62px);
  line-height: 1;
  letter-spacing: -0.01em;
}

.brand__claim {
  color: var(--color-accent);
  font-size: clamp(18px, 2vw, 28px);
  line-height: 1.2;
}

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

.hero {
  padding-block: clamp(50px, 8vw, 120px) clamp(90px, 14vw, 200px);
}

/* Slogan – zweiteilig animiert */
.slogan {
  margin: 0 0 clamp(50px, 8vw, 110px);
  font-family: var(--font-headline);
  font-weight: 700;
  font-stretch: var(--headline-width);
  font-size: clamp(44px, 6vw, 84px);
  line-height: 1;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.slogan__part {
  display: inline-block;
  opacity: 0;
  translate: 0 0.25em;
  animation: slogan-in 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}

.slogan__part--1 {
  animation-delay: 0.2s;
}

.slogan__part--2 {
  animation-delay: 0.9s;
}

@keyframes slogan-in {
  to {
    opacity: 1;
    translate: 0 0;
  }
}

.hero__title {
  margin: 0 0 0.35em;
  font-family: var(--font-headline);
  font-weight: 700;
  font-stretch: var(--headline-width);
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.01em;
}

.hero__text {
  margin: 0;
  max-width: 62ch;
}

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

.section-title {
  margin: 0 0 0.6em;
  font-family: var(--font-headline);
  font-weight: 700;
  font-stretch: var(--headline-width);
  font-size: clamp(44px, 6vw, 84px);
  line-height: 1;
  letter-spacing: -0.01em;
}

/* --------------------------------------------------------------------------
   FAQ
   -------------------------------------------------------------------------- */

.faq {
  padding-block: 0 clamp(90px, 14vw, 200px);
}

.faq__list {
  display: flex;
  flex-direction: column;
  gap: 0.6em;
}

.faq__item {
  --icon-size: 1.7em;
  position: relative;
  padding-left: calc(var(--icon-size) + 0.9em);
}

.faq__question {
  position: relative;
  display: block;
  cursor: pointer;
  list-style: none;
  padding-block: 0.25em;
  user-select: none;
}

.faq__question::-webkit-details-marker {
  display: none;
}

/* Kreis-Icon mit Plus / Kreuz */
.faq__question::before {
  content: "";
  position: absolute;
  left: calc(-1 * (var(--icon-size) + 0.9em));
  top: 0.15em;
  width: var(--icon-size);
  height: var(--icon-size);
  border-radius: 50%;
  background: var(--color-accent);
  transition: background-color 0.2s ease;
}

.faq__question::after {
  content: "";
  position: absolute;
  left: calc(-1 * (var(--icon-size) + 0.9em) + var(--icon-size) / 2);
  top: calc(0.15em + var(--icon-size) / 2);
  width: calc(var(--icon-size) * 0.52);
  height: calc(var(--icon-size) * 0.52);
  translate: -50% -50%;
  background:
    linear-gradient(var(--color-bg), var(--color-bg)) center / 100% 3px no-repeat,
    linear-gradient(var(--color-bg), var(--color-bg)) center / 3px 100% no-repeat;
  transition: rotate 0.25s ease;
}

.faq__item[open] > .faq__question::after {
  rotate: 45deg;
}

.faq__question:hover::before {
  background: var(--color-accent-hover);
}

.faq__answer {
  color: var(--color-accent);
  padding-block: 0.1em 0.6em;
  max-width: 70ch;
  animation: faq-fade-in 0.4s ease both;
}

@keyframes faq-fade-in {
  from { opacity: 0; translate: 0 -4px; }
  to   { opacity: 1; translate: 0 0; }
}

.faq__answer p {
  margin: 0 0 0.7em;
}

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

/* --------------------------------------------------------------------------
   Kontakt
   -------------------------------------------------------------------------- */

.contact {
  padding-block: 0 clamp(90px, 14vw, 200px);
}

.contact__card {
  display: flex;
  flex-direction: column;
  gap: 0.15em;
  font-style: normal;
  font-size: 1.15em;
}

.contact__name {
  font-weight: 400;
}

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

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5em 2em;
  padding-block: 1.5em 2.5em;
  font-size: 0.85em;
  color: var(--color-muted);
}

.site-footer p {
  margin: 0;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--color-accent);
}

.sep {
  margin-inline: 0.5em;
  opacity: 0.7;
}

/* --------------------------------------------------------------------------
   Unterseiten (Impressum, Datenschutz)
   -------------------------------------------------------------------------- */

.legal {
  padding-block: clamp(60px, 8vw, 120px) clamp(90px, 14vw, 200px);
}

.legal h2,
.legal h3,
.legal p,
.legal ul {
  max-width: 75ch;
}

.legal h2 {
  margin: 2em 0 0.5em;
  font-family: var(--font-headline);
  font-weight: 700;
  font-stretch: var(--headline-width);
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.1;
}

.legal h3 {
  margin: 1.6em 0 0.4em;
  font-family: var(--font-headline);
  font-weight: 600;
  font-stretch: 90%;
  font-size: 1.2em;
  line-height: 1.25;
  color: var(--color-text);
}

.legal p,
.legal ul {
  margin: 0 0 1em;
}

.legal a {
  color: var(--color-accent);
}

.legal a:hover,
.legal a:focus-visible {
  color: var(--color-accent-hover);
}

.back-link {
  display: inline-block;
  margin-top: 3em;
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Reduced motion
   -------------------------------------------------------------------------- */

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

  .faq__question::before,
  .faq__question::after {
    transition: none;
  }

  .faq__answer {
    animation: none;
  }

  .slogan__part {
    animation: none;
    opacity: 1;
    translate: 0 0;
  }
}