/* ==========================================================
   BAYBARS CONSULTING
   Unfallhilfe Stuttgart

   System  : B-UI
   Version : 2.0
   Build   : 2026.08.14
   Status  : Release Candidate

   File    : 03-layout.css
   Doc-ID  : BUI-UHS-CSS-003

   Purpose :
   Global page layout, header, navigation, footer and responsive structure.

   Copyright (c) 2026 BAYBARS CONSULTING.
   All rights reserved.
========================================================== */
/* ==========================================================
   01. Container und allgemeines Layout
========================================================== */
.container {
  width: min(100% - 2rem, var(--container));
  margin-right: auto;
  margin-left: auto;
}

.section {
  padding: clamp(4rem, 7vw, 7rem) 0;
}

/* ==========================================================
   02. Header / Global Navigation
========================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
  transition:
    box-shadow var(--transition-fast),
    background var(--transition-fast);
}

.site-header.is-scrolled {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.header-inner {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.header-logo {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 14px;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  line-height: 1.15;
}

.header-logo img {
  width: 64px;
  height: 64px;
  object-fit: contain;
}

.header-logo span {
  display: block;
  max-width: 150px;
  font-size: 0.98rem;
  font-weight: 500;
  line-height: 1.18;
  letter-spacing: -0.015em;
  text-rendering: optimizeLegibility;
}

/* ----------------------------------------------------------
   Primary Navigation
---------------------------------------------------------- */

.primary-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
}

.nav-item {
  position: relative;
}

.nav-group-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 44px;
  padding: 8px 9px;
  border: 0;
  background: transparent;
  color: var(--color-text);
  font: inherit;
  font-size: 0.91rem;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition:
    color var(--transition-fast),
    background var(--transition-fast);
}

.nav-group-toggle::after {
  content: "";
  position: absolute;
  right: 9px;
  bottom: 2px;
  left: 9px;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

.nav-group-toggle:hover,
.nav-group-toggle:focus-visible,
.nav-item.is-active > .nav-group-toggle {
  color: var(--color-primary);
}

.nav-group-toggle:hover::after,
.nav-group-toggle:focus-visible::after,
.nav-item.is-active > .nav-group-toggle::after,
.nav-item.is-open > .nav-group-toggle::after {
  transform: scaleX(1);
}

.nav-chevron {
  flex: 0 0 auto;
  transition: transform var(--transition-fast);
}

.nav-item.is-open > .nav-group-toggle .nav-chevron {
  transform: rotate(180deg);
}

/* ----------------------------------------------------------
   Desktop Dropdowns
---------------------------------------------------------- */

.nav-submenu {
  position: absolute;
  top: calc(100% + 14px);
  left: 0;
  z-index: 20;
  display: grid;
  width: min(340px, calc(100vw - 40px));
  padding: 10px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.13);
  visibility: hidden;
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition:
    opacity var(--transition-fast),
    visibility var(--transition-fast),
    transform var(--transition-fast);
}

.nav-submenu--right {
  right: 0;
  left: auto;
}

.nav-item.is-open > .nav-submenu {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.nav-submenu a {
  display: grid;
  gap: 3px;
  padding: 11px 12px;
  color: var(--color-text);
  text-decoration: none;
  border-radius: calc(var(--radius-md) - 4px);
  transition:
    color var(--transition-fast),
    background var(--transition-fast);
}

.nav-submenu a:hover,
.nav-submenu a:focus-visible,
.nav-submenu a[aria-current="page"] {
  color: var(--color-primary);
  background: rgba(214, 40, 40, 0.06);
}

.nav-submenu-title {
  font-size: 0.93rem;
  font-weight: 600;
  line-height: 1.3;
}

.nav-submenu-description {
  color: var(--color-muted);
  font-size: 0.78rem;
  font-weight: 400;
  line-height: 1.4;
}

.nav-submenu a:hover .nav-submenu-description,
.nav-submenu a:focus-visible .nav-submenu-description,
.nav-submenu a[aria-current="page"] .nav-submenu-description {
  color: inherit;
}

/* ----------------------------------------------------------
   Primary CTA
---------------------------------------------------------- */

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-left: 8px;
  padding: 12px 17px;
  color: #ffffff;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 18px rgba(214, 40, 40, 0.22);
  text-decoration: none;
  font-size: 0.91rem;
  font-weight: 600;
  white-space: nowrap;
}

/* ----------------------------------------------------------
   Mobile Toggle
---------------------------------------------------------- */

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  margin: 6px auto;
  background: var(--color-text);
  transition:
    transform var(--transition-fast),
    opacity var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ----------------------------------------------------------
   Tablet Adjustment
---------------------------------------------------------- */

@media (max-width: 1120px) and (min-width: 901px) {
  .header-inner {
    gap: 18px;
  }

  .header-logo {
    gap: 10px;
  }

  .header-logo span {
    max-width: 118px;
    font-size: 0.9rem;
  }

  .primary-nav {
    gap: 0;
  }

  .nav-group-toggle {
    padding-inline: 7px;
    font-size: 0.84rem;
  }

  .nav-group-toggle::after {
    right: 7px;
    left: 7px;
  }

  .nav-cta {
    margin-left: 5px;
    padding-inline: 13px;
    font-size: 0.84rem;
  }
}

/* ----------------------------------------------------------
   Mobile Navigation
---------------------------------------------------------- */

@media (max-width: 900px) {
  .header-inner {
    min-height: 74px;
  }

  .header-logo img {
    width: 56px;
    height: 56px;
  }

  .header-logo span {
    max-width: 142px;
    font-size: 0.94rem;
  }

  .nav-toggle {
    display: block;
    flex: 0 0 auto;
  }

  .primary-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    max-height: calc(100dvh - 74px);
    padding: 12px 20px 20px;
    overflow-y: auto;
    overscroll-behavior: contain;
    background: #1f1f1f;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 18px 34px rgba(0, 0, 0, 0.22);
  }

  .primary-nav.is-open {
    display: block;
  }

  .nav-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  }

  .nav-group-toggle {
    width: 100%;
    min-height: 54px;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 2px;
    color: #ffffff;
    font-size: 1rem;
    text-align: left;
  }

  .nav-group-toggle::after {
    display: none;
  }

  .nav-item.is-active > .nav-group-toggle {
    color: var(--color-primary);
  }

  .nav-submenu,
  .nav-submenu--right {
    position: static;
    display: none;
    width: auto;
    padding: 0 0 12px;
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    visibility: visible;
    opacity: 1;
    transform: none;
    pointer-events: auto;
    transition: none;
  }

  .nav-item.is-open > .nav-submenu {
    display: grid;
  }

  /*
   * On mobile, focus alone must not open an accordion.
   * The explicit button state controls visibility.
   */
  .nav-item:focus-within > .nav-submenu {
    display: none;
  }

  .nav-item.is-open:focus-within > .nav-submenu {
    display: grid;
  }

  .nav-submenu a {
    gap: 2px;
    padding: 10px 12px;
    color: rgba(255, 255, 255, 0.92);
  }

  .nav-submenu-title {
    font-size: 0.94rem;
  }

  .nav-submenu-description {
    color: rgba(255, 255, 255, 0.62);
    font-size: 0.8rem;
  }

  .nav-cta {
    width: 100%;
    min-height: 52px;
    margin: 18px 0 0;
    padding: 15px 20px;
    font-size: 1rem;
  }
}

@media (max-width: 420px) {
  .header-logo {
    gap: 9px;
  }

  .header-logo img {
    width: 52px;
    height: 52px;
  }

  .header-logo span {
    max-width: 120px;
    font-size: 0.88rem;
  }
}

/* ==========================================================
   02. Site Footer
========================================================== */

.site-footer {
  padding: 4.5rem 0 2rem;
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  border-top: 1px solid var(--color-footer-border);
}

.site-footer__grid {
  display: grid;
  grid-template-columns:
    minmax(17rem, 1.55fr)
    minmax(10rem, 0.78fr)
    minmax(11rem, 0.95fr)
    minmax(12rem, 0.9fr);
  gap: clamp(2rem, 4vw, 4.5rem);
  align-items: start;
}

.site-footer__brand {
  min-width: 0;
}

.site-footer__logo {
  display: inline-block;
  color: var(--color-footer-text);
  font-size: clamp(1.35rem, 2vw, 1.65rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  text-decoration: none;
  text-underline-offset: 0.2em;
  transition:
    color var(--transition-fast),
    text-decoration-color var(--transition-fast);
}

.site-footer__logo:hover,
.site-footer__logo:focus-visible {
  color: var(--color-footer-text);
  text-decoration: underline;
}

.site-footer__description {
  max-width: 38rem;
  margin: 1.25rem 0 0;
  color: var(--color-footer-text-muted);
  font-size: 0.96rem;
  line-height: 1.75;
}

.site-footer__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.25rem;
  margin-top: 1.75rem;
}

.site-footer__actions .btn {
  flex: 0 0 auto;
}

.site-footer__text-link {
  color: var(--color-footer-text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 0.25em;
  transition:
    color var(--transition-fast),
    text-decoration-color var(--transition-fast);
}

.site-footer__text-link:hover,
.site-footer__text-link:focus-visible {
  color: var(--color-footer-text);
  text-decoration-color: currentColor;
}

.site-footer__column {
  min-width: 0;
}

.site-footer__title {
  margin: 0 0 1.125rem;
  color: var(--color-footer-text);
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.01em;
}

.site-footer__links {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer__links li {
  margin: 0;
}

.site-footer__links a {
  display: inline;
  color: var(--color-footer-text-muted);
  font-size: 0.92rem;
  line-height: 1.55;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 0.25em;
  transition:
    color var(--transition-fast),
    text-decoration-color var(--transition-fast);
}

.site-footer__links a:hover,
.site-footer__links a:focus-visible {
  color: var(--color-footer-text);
  text-decoration-color: currentColor;
}

/* ==========================================================
   03. Footer Meta Information
========================================================== */

.site-footer__bottom {
  display: grid;
  grid-template-columns:
    minmax(16rem, 1fr)
    minmax(20rem, auto);
  gap: 2rem 3rem;
  align-items: start;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-footer-border);
}

.site-footer__legal {
  display: grid;
  gap: 0.35rem;
  min-width: 0;
  color: var(--color-footer-text-subtle);
  font-size: 0.78rem;
  line-height: 1.55;
}

.site-footer__legal span {
  display: block;
}

.site-footer__legal a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 0.2em;
  transition:
    color var(--transition-fast),
    text-decoration-color var(--transition-fast);
}

.site-footer__legal a:hover,
.site-footer__legal a:focus-visible {
  color: var(--color-footer-text);
  text-decoration-color: currentColor;
}

.footer-build {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem 0.55rem;
  min-width: 0;
  color: var(--color-footer-text-subtle);
  font-size: 0.78rem;
  line-height: 1.55;
  text-align: right;
}

.footer-build__version {
  color: var(--color-footer-text-muted);
  font-weight: 600;
}

.footer-build__separator {
  color: var(--color-footer-divider);
}

.footer-build a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 0.2em;
  transition:
    color var(--transition-fast),
    text-decoration-color var(--transition-fast);
}

.footer-build a:hover,
.footer-build a:focus-visible {
  color: var(--color-footer-text);
  text-decoration-color: currentColor;
}

/* ==========================================================
   04. Site Footer — Tablet
========================================================== */

@media (max-width: 72rem) {
  .site-footer__grid {
    grid-template-columns:
      minmax(0, 1.35fr)
      minmax(0, 1fr)
      minmax(0, 1fr);
  }

  .site-footer__brand {
    grid-column: 1 / -1;
    max-width: 48rem;
  }

  .site-footer__description {
    max-width: 46rem;
  }

  .site-footer__bottom {
    grid-template-columns: 1fr;
  }

  .footer-build {
    justify-content: flex-start;
    text-align: left;
  }
}

/* ==========================================================
   05. Site Footer — Mobile
========================================================== */

@media (max-width: 48rem) {
  .site-footer {
    padding: 3.5rem 0 8rem;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .site-footer__brand {
    grid-column: auto;
    max-width: none;
  }

  .site-footer__description {
    max-width: none;
    font-size: 0.94rem;
    line-height: 1.7;
  }

  .site-footer__actions {
    align-items: stretch;
  }

  .site-footer__actions .btn {
    width: 100%;
    justify-content: center;
    text-align: center;
  }

  .site-footer__text-link {
    width: 100%;
    text-align: center;
  }

  .site-footer__links {
    gap: 0.875rem;
  }

  .site-footer__links a {
    font-size: 0.95rem;
  }

  .site-footer__bottom {
    gap: 1.5rem;
    margin-top: 3rem;
    padding-top: 1.5rem;
  }

  .site-footer__legal {
    gap: 0.5rem;
    font-size: 0.76rem;
  }

  .footer-build {
    display: grid;
    justify-content: stretch;
    gap: 0.5rem;
    font-size: 0.76rem;
    text-align: left;
  }

  .footer-build__separator {
    display: none;
  }
}

/* ==========================================================
   06. Site Footer — Small Mobile
========================================================== */

@media (max-width: 30rem) {
  .site-footer {
    padding-top: 3rem;
  }

  .site-footer__grid {
    gap: 2.25rem;
  }

  .site-footer__logo {
    font-size: 1.4rem;
  }

  .site-footer__description {
    font-size: 0.9rem;
  }
}