*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --scale: 1.2;

  --bg:     oklch(99.5% 0.002 80);
  --fg:     oklch(13% 0.012 80);
  --fg-dim: oklch(48% 0.012 80);
  --green:  oklch(56% 0.21 145);
  --border: oklch(85% 0.006 80);
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: 'Fira Sans', Helvetica, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.page {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-bottom: calc(80px * var(--scale));
}

.header-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.bird-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: calc(22px * var(--scale));
  flex-shrink: 0;
}

@keyframes birdFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.bird-wrap img {
  width: calc(88px * var(--scale));
  height: auto;
  display: block;
  transition: opacity 0.5s ease;
  animation: birdFadeIn 2.5s ease forwards;
}

.bird-wrap.clickable {
  cursor: pointer;
}

.bird-wrap.clickable:hover img {
  opacity: 0.7;
}

.wordmark {
  font-weight: 300;
  font-size: calc(16px * var(--scale));
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--fg);
  text-align: center;
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.wordmark.hidden {
  opacity: 0;
  transform: translateY(calc(6px * var(--scale)));
  pointer-events: none;
}

nav {
  display: flex;
  gap: 0;
  align-items: center;
  margin-top: calc(10px * var(--scale));
  transition:
    opacity 0.5s ease 0.08s,
    transform 0.5s ease 0.08s,
    margin-bottom 0.4s ease;
}

nav.hidden {
  opacity: 0;
  transform: translateY(calc(6px * var(--scale)));
  pointer-events: none;
}

.nav-item {
  background: none;
  border: none;
  cursor: pointer;
  font-family: 'Fira Sans', Helvetica, sans-serif;
  font-weight: 300;
  font-size: calc(11px * var(--scale));
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--fg-dim);
  padding: calc(6px * var(--scale)) calc(16px * var(--scale));
  position: relative;
  transition: color 0.25s;
}

.nav-item::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: calc(12px * var(--scale));
  background: var(--border);
}

.nav-item:last-child::after {
  display: none;
}

.nav-item:hover {
  color: var(--fg);
}

.nav-item.active {
  color: var(--green);
}

@keyframes welcomeIn {
  from {
    opacity: 0;
    transform: translate(-50%, calc(8px * var(--scale)));
  }

  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

.intro-welcome {
  position: absolute;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
  font-weight: 300;
  font-size: calc(13px * var(--scale));
  letter-spacing: 0.38em;
  text-transform: uppercase;
  color: var(--fg-dim);
  white-space: nowrap;
  animation: welcomeIn 1.5s ease 0.3s backwards;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

.intro-welcome.fading {
  opacity: 0;
}
.language-switch {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: calc(9px * var(--scale));
  font-weight: 300;
  letter-spacing: 0.18em;
  color: var(--fg-dim);
  transition: opacity 0.5s ease 0.12s, transform 0.5s ease 0.12s;
}

.language-switch.hidden {
  opacity: 0;
  transform: translateY(calc(6px * var(--scale)));
  pointer-events: none;
}

.lang-link {
  color: var(--fg-dim);
  text-decoration: none;
  transition: color 0.25s ease;
}

.lang-link:hover,
.lang-link.active {
  color: var(--green);
}


.header-stack {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  min-height: calc(56px * var(--scale));
}

.content-wrap {
  width: 100%;
  max-width: calc(480px * var(--scale));
  overflow: hidden;
  transition:
    max-height 0.55s cubic-bezier(0.16, 1, 0.3, 1),
    opacity 0.45s ease;
  max-height: 0;
  opacity: 0;
}

.content-wrap.open {
  max-height: calc(900px * var(--scale));
  opacity: 1;
}

.content-section {
  display: none;
}

.content-section.visible {
  display: block;
}

.content-panel {
  padding: calc(20px * var(--scale)) calc(38px * var(--scale));
  text-align: center;
}

.content-panel p {
  font-size: calc(12.5px * var(--scale));
  font-weight: 300;
  letter-spacing: 0.04em;
  line-height: 1.9;
  color: var(--fg-dim);
  text-wrap: pretty;
}

.ansatz-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(5px * var(--scale));
  max-width: calc(300px * var(--scale));
  margin: 0 auto;
}

.ansatz-item {
  position: relative;
  grid-column: span 1;
  aspect-ratio: 1.25 / 1;
}

.ansatz-trigger {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: calc(10px * var(--scale));
  padding: calc(10px * var(--scale));
  background: none;
  border: none;
  width: 100%;
  height: 100%;
  cursor: pointer;
  font-family: 'Fira Sans', Helvetica, sans-serif;
  font-weight: 300;
  font-size: calc(11px * var(--scale));
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--fg);
  text-align: center;
  border-radius: calc(2px * var(--scale));
  transition: color 0.4s ease, background 0.4s ease;
}

.ansatz-trigger:hover {
  color: var(--green);
  background: oklch(98% 0.003 80);
}

.ansatz-trigger.open {
  color: var(--green);
  background: oklch(97.5% 0.008 145);
}

.ansatz-glyph {
  width: calc(26px * var(--scale));
  height: calc(26px * var(--scale));
  display: block;
  color: var(--fg-dim);
  transition: color 0.5s ease;
}

.ansatz-trigger:hover .ansatz-glyph,
.ansatz-trigger.open .ansatz-glyph {
  color: var(--green);
}

.ansatz-glyph * {
  transition:
    transform 1.1s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    stroke-dashoffset 1.1s cubic-bezier(0.22, 1, 0.36, 1);
  transform-box: fill-box;
  transform-origin: center;
}

.glyph-klarheit .ring-1 {
  transform: scale(1);
  opacity: 0.35;
}

.glyph-klarheit .ring-2 {
  transform: scale(1);
  opacity: 0.55;
}

.glyph-klarheit .ring-3 {
  transform: scale(1);
  opacity: 0.8;
}

.glyph-klarheit .dot {
  transform: scale(1);
  opacity: 1;
}

.ansatz-trigger.open .glyph-klarheit .ring-1 {
  transform: scale(0.6);
  opacity: 0.15;
}

.ansatz-trigger.open .glyph-klarheit .ring-2 {
  transform: scale(0.45);
  opacity: 0.3;
}

.ansatz-trigger.open .glyph-klarheit .ring-3 {
  transform: scale(0.3);
  opacity: 0.5;
}

.ansatz-trigger.open .glyph-klarheit .dot {
  transform: scale(1.4);
  opacity: 1;
}

.glyph-hebel .baseline {
  opacity: 0.3;
}

.glyph-hebel .input-dot {
  transform: translateY(0);
  opacity: 0.6;
}

.glyph-hebel .output-bar {
  transform: translateY(0) scaleY(0.4);
  transform-origin: center bottom;
  opacity: 0.7;
}

.ansatz-trigger.open .glyph-hebel .baseline {
  opacity: 0.5;
}

.ansatz-trigger.open .glyph-hebel .input-dot {
  transform: translateY(calc(1px * var(--scale)));
  opacity: 1;
}

.ansatz-trigger.open .glyph-hebel .output-bar {
  transform: translateY(0) scaleY(1);
  opacity: 1;
}

.glyph-itai .edge {
  stroke-dasharray: 24;
  stroke-dashoffset: 24;
  opacity: 0.5;
}

.ansatz-trigger.open .glyph-itai .edge {
  stroke-dashoffset: 0;
  opacity: 1;
}

.glyph-itai .edge-1 {
  transition-delay: 0ms;
}

.glyph-itai .edge-2 {
  transition-delay: 80ms;
}

.glyph-itai .edge-3 {
  transition-delay: 160ms;
}

.glyph-itai .edge-4 {
  transition-delay: 240ms;
}

.glyph-systeme .s-link {
  stroke-dasharray: 24;
  stroke-dashoffset: 24;
  opacity: 0.3;
}

.glyph-systeme .s-node {
  opacity: 0.5;
}

.ansatz-trigger.open .glyph-systeme .s-link {
  stroke-dashoffset: 0;
  opacity: 0.85;
}

.ansatz-trigger.open .glyph-systeme .s-node {
  opacity: 1;
}

.glyph-systeme .s-link-1 {
  transition-delay: 0ms;
}

.glyph-systeme .s-link-2 {
  transition-delay: 60ms;
}

.glyph-systeme .s-link-3 {
  transition-delay: 120ms;
}

.glyph-systeme .s-link-4 {
  transition-delay: 180ms;
}

.glyph-systeme .s-link-5 {
  transition-delay: 240ms;
}

.glyph-systeme .s-link-6 {
  transition-delay: 300ms;
}

.ansatz-body {
  grid-column: 1 / -1;
  overflow: hidden;
  max-height: 0;
  transition:
    max-height 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.5s ease;
  opacity: 0;
}

.ansatz-body.open {
  max-height: calc(320px * var(--scale));
  opacity: 1;
}

.ansatz-body p {
  font-size: calc(12px * var(--scale));
  font-weight: 300;
  letter-spacing: 0.03em;
  line-height: 1.8;
  color: var(--fg-dim);
  padding: calc(18px * var(--scale));
  text-align: center;
  text-wrap: pretty;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: calc(10px * var(--scale));
  font-style: normal;
}

.contact-list p {
  font-size: calc(12.5px * var(--scale));
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--fg-dim);
}

.contact-list a {
  display: block;
  margin-top: calc(6px * var(--scale));
  font-size: calc(12.5px * var(--scale));
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
  text-decoration: none;
  transition: color 0.2s;
}

.contact-list a:hover {
  color: var(--green);
}

.site-footer {
  margin-top: auto;
  padding-top: calc(60px * var(--scale));
  font-size: calc(10px * var(--scale));
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: oklch(70% 0.006 80);
  text-align: center;
  transition: opacity 0.8s ease 0.5s;
}

.footer-lang {
  display: block;
  width: max-content;
  margin: calc(10px * var(--scale)) auto 0;
  color: inherit;
  text-decoration: none;
  opacity: 0;
  transform: translateY(calc(-4px * var(--scale)));
  pointer-events: none;
  transition:
    opacity 0.35s ease,
    transform 0.35s ease,
    color 0.25s ease;
}

.site-footer:hover .footer-lang,
.site-footer:focus-within .footer-lang {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.footer-lang:hover {
  color: var(--green);
}