/* LUESS YAPI | V6 shared interface language
   The site is an architectural grid with square geometry. All preference controls
   follow the same square edges, 1px rules, spacing rhythm and gold focus/accent. */
:root {
  --ui-radius: 0px;
  --ui-line: var(--line);
  --ui-gap-xs: 8px;
  --ui-gap-sm: 12px;
  --ui-gap-md: 20px;
  --ui-gap-lg: 28px;
  --ui-touch: 44px;
  --ui-label-size: 11px;
}

/* Skip links are only shown for keyboard users. */
.skip-to-content {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  transform: translateY(-150%);
  padding: 12px 18px;
  background: var(--gold);
  color: #16120d;
  font-size: 12px;
  font-weight: 750;
  border: 1px solid var(--gold);
  border-radius: var(--ui-radius);
}
.skip-to-content:focus { transform: translateY(0); }
#main-content { scroll-margin-top: 90px; }

/* Buttons, form controls and page cards share one corner treatment. */
:where(.menu-btn, .outline-btn, .dark-btn, .footer-cta, .page-main .btn-primary,
  .page-main .btn-outline, .page-main .cta-button, .page-main .project-card,
  .page-main .blog-card, .page-main .info-card,
  .page-main .form-group input, .page-main .form-group textarea,
  .page-main .form-group select) { border-radius: var(--ui-radius); }

/* Header settings: no floating pill, flags, gradient, round switch, or shadows. */
.topbar .ui-preferences {
  color: var(--text);
  font-family: inherit;
  font-size: var(--ui-label-size);
}
.topbar .ui-preferences--desktop {
  display: inline-flex;
  align-items: center;
  justify-self: end;
  gap: 0;
  min-width: 0;
  padding: 0;
  border: 0;
  border-radius: var(--ui-radius);
  background: transparent;
  box-shadow: none;
}
.topbar .ui-preferences--mobile { display: none; }
.ui-theme, .ui-lang-option {
  -webkit-tap-highlight-color: transparent;
  appearance: none;
  border: 0;
  border-radius: var(--ui-radius);
  color: inherit;
  background: transparent;
  box-shadow: none;
  font-family: inherit;
  font-size: 11px;
  font-weight: 740;
  letter-spacing: .065em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}
.topbar .ui-theme {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  gap: var(--ui-gap-xs);
  min-width: 0;
  height: var(--ui-touch);
  padding: 0 16px 0 12px;
  line-height: 1.1;
  white-space: nowrap;
}
.ui-theme:hover, .ui-lang-option:hover { color: var(--gold); }
.ui-theme__icon { width: 16px; height: 16px; flex: 0 0 16px; }
.ui-theme__moon { display: none; }
html[data-theme="dark"] .ui-theme__sun { display: none; }
html[data-theme="dark"] .ui-theme__moon { display: block; }
.ui-theme__label { display: inline; }
.ui-theme__arrow { display: none; }
.topbar .ui-languages {
  display: inline-flex;
  align-items: center;
  gap: 0;
  padding: 0 0 0 var(--ui-gap-xs);
  border-left: 1px solid var(--ui-line);
  border-radius: var(--ui-radius);
  background: transparent;
}
.topbar .ui-lang-option {
  position: relative;
  display: inline-grid;
  place-items: center;
  height: var(--ui-touch);
  width: 36px;
  padding: 0;
  line-height: 1;
  opacity: .7;
}
.topbar .ui-lang-option.is-active {
  color: var(--gold);
  font-weight: 820;
  opacity: 1;
}
.topbar .ui-lang-option.is-active::after {
  content: "";
  position: absolute;
  left: 9px;
  right: 9px;
  bottom: 5px;
  height: 2px;
  background: var(--gold);
}
.topbar .ui-theme:focus-visible,
.topbar .ui-lang-option:focus-visible,
.topbar .menu-btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* Standard header typography and spacing align with the site's strict grid. */
.topbar .outline-btn, .topbar .menu-btn { border-radius: var(--ui-radius); }
@media (min-width: 781px) {
  .topbar { grid-template-columns: minmax(110px, 170px) minmax(0, 1fr) auto max-content; }
  .topbar .ui-preferences--desktop { grid-column: 3; grid-row: 1; }
}
@media (min-width: 781px) and (max-width: 1180px) {
  .topbar .ui-theme { width: 42px; height: 42px; padding: 0; }
  .topbar .ui-theme__label { /* Keeps its accessible name via aria-label. */
    position: absolute; width: 1px; height: 1px; overflow: hidden;
    clip-path: inset(50%); white-space: nowrap;
  }
  .topbar .ui-lang-option { width: 31px; height: 42px; }
}

/* Mobile: the header has only logo + square menu button. The same components
   live inside the real navigation drawer, so focus and inert behavior are unified. */
@media (max-width: 780px) {
  :root { --mobile-header-height: 78px; }
  .topbar, html[data-theme="dark"] .topbar {
    grid-template-columns: minmax(0, 1fr) var(--ui-touch);
    column-gap: var(--ui-gap-md);
    height: var(--mobile-header-height);
    min-height: 0;
    padding-inline: var(--section-x);
  }
  .topbar.is-scrolled { --mobile-header-height: 72px; height: var(--mobile-header-height); }
  .topbar .brand { grid-column: 1; grid-row: 1; width: 82px; }
  .topbar.is-scrolled .brand { width: 78px; }
  .topbar .menu-btn {
    grid-column: 2;
    grid-row: 1;
    width: var(--ui-touch);
    min-width: var(--ui-touch);
    height: var(--ui-touch);
    border: 1px solid var(--ui-line);
    padding: 0;
    z-index: 3;
  }
  html[data-theme="dark"] .topbar .menu-btn { border-color: var(--ui-line); }
  .topbar .ui-preferences--desktop { display: none !important; }
  .topbar .nav, html[lang="de"] .topbar .nav {
    inset: var(--mobile-header-height) 0 0;
    height: calc(100dvh - var(--mobile-header-height));
    max-height: calc(100dvh - var(--mobile-header-height));
    gap: 0;
    padding: var(--ui-gap-md) var(--section-x) var(--ui-gap-lg);
    border-radius: var(--ui-radius);
  }
  .topbar .nav > a, html[lang="de"] .topbar .nav > a {
    flex: 0 0 auto;
    font-size: clamp(17px, 4.6vw, 21px);
    font-weight: 580;
    line-height: 1.3;
    letter-spacing: -.035em;
    padding-block: clamp(12px, 2.2vh, 19px);
  }
  .topbar .nav .ui-preferences--mobile {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: var(--ui-gap-md);
    flex: 0 0 auto;
    margin-top: 26px;
    padding: 25px 0 10px;
    border-top: 1px solid var(--ui-line);
  }
  .topbar .nav .ui-preferences__group {
    display: grid;
    grid-template-columns: minmax(78px, 25%) minmax(0, 1fr);
    gap: var(--ui-gap-sm);
    align-items: center;
    min-width: 0;
  }
  .topbar .nav .ui-preferences__heading {
    color: var(--muted);
    font-size: 10px;
    font-weight: 750;
    letter-spacing: .12em;
    line-height: 1.4;
    text-transform: uppercase;
  }
  .topbar .nav .ui-languages {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--ui-gap-xs);
    width: 100%;
    max-width: 285px;
    padding: 0;
    border: 0;
    background: transparent;
  }
  .topbar .nav .ui-lang-option {
    width: 100%;
    height: var(--ui-touch);
    border: 1px solid var(--ui-line);
    background: transparent;
    font-size: 12px;
    opacity: 1;
  }
  .topbar .nav .ui-lang-option.is-active {
    border-color: var(--gold);
    color: var(--gold);
    background: rgba(195,139,55,.065);
  }
  .topbar .nav .ui-lang-option.is-active::after { display: none; }
  .topbar .nav .ui-theme {
    width: 100%;
    max-width: 285px;
    min-height: var(--ui-touch);
    height: var(--ui-touch);
    padding: 0 14px;
    justify-content: flex-start;
    border: 1px solid var(--ui-line);
    color: inherit;
    background: transparent;
    font-size: 11px;
  }
  .topbar .nav .ui-theme:hover { border-color: var(--gold); color: var(--gold); }
  .topbar .nav .ui-theme__arrow { display: inline; margin-left: auto; font-size: 13px; }
  /* Apply the dark scheme to the same edges, contrast, and geometry. */
  html[data-theme="dark"] .topbar .nav .ui-lang-option.is-active { background: rgba(226,188,117,.08); }
  html[data-theme="dark"] .topbar .nav .ui-preferences--mobile { border-top-color: var(--ui-line); }
  html[data-theme="dark"] .topbar .nav .ui-theme { border-color: var(--ui-line); }
  html[data-theme="dark"] .topbar .nav .ui-theme:hover { border-color: var(--gold); }
}
@media (max-width: 375px) {
  .topbar .brand { width: 73px; }
  .topbar.is-scrolled .brand { width: 70px; }
  .topbar .nav .ui-preferences__group { grid-template-columns: minmax(68px,24%) minmax(0,1fr); gap: 8px; }
  .topbar .nav .ui-languages { gap: 6px; }
}
@media (max-height: 560px) and (max-width: 780px) {
  .topbar .nav > a { padding-block: 10px; }
  .topbar .nav .ui-preferences--mobile { margin-top: 16px; padding-top: 17px; }
}
@media (prefers-reduced-motion: reduce) {
  .topbar .nav, .ui-theme, .ui-lang-option { transition: none !important; }
}

/* V7: icon-only appearance switch — identical square geometry on every screen. */
.topbar .ui-theme {
  width: var(--ui-touch);
  min-width: var(--ui-touch);
  height: var(--ui-touch);
  padding: 0;
  gap: 0;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--ui-radius);
}
.topbar .ui-theme:hover { border-color: var(--ui-line); }
.topbar .ui-theme__icon { width: 19px; height: 19px; flex-basis: 19px; }
.topbar .ui-theme__label, .topbar .ui-theme__arrow { display: none !important; }
@media (max-width: 780px) {
  .topbar .nav .ui-theme {
    width: var(--ui-touch);
    max-width: var(--ui-touch);
    min-width: var(--ui-touch);
    height: var(--ui-touch);
    min-height: var(--ui-touch);
    padding: 0;
    justify-content: center;
    border: 1px solid var(--ui-line);
  }
}