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

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

   File    : 04-components.css
   Doc-ID  : BUI-UHS-CSS-004

   Purpose :
   Reusable interface components shared across the project.

   Copyright (c) 2026 BAYBARS CONSULTING.
   All rights reserved.
========================================================== */
/* ==========================================================
   Skip Link
========================================================== */

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 10000;
  padding: 0.8rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--color-text);
  color: var(--color-bg);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transform: translateY(calc(-100% - 1.5rem));
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ==========================================================
   Primary Action System
========================================================== */

.btn,
.cta-button,
.nav-cta,
.sticky-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 0;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: 600;
  line-height: 1.2;
  -webkit-font-smoothing: antialiased;
  text-decoration: none;
  transition:
    background var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.btn:hover,
.btn:focus-visible,
.cta-button:hover,
.cta-button:focus-visible,
.nav-cta:hover,
.nav-cta:focus-visible,
.sticky-button:hover,
.sticky-button:focus-visible {
  background: var(--color-primary-hover);
  color: var(--color-on-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary-hover);
}

.btn-primary {
  padding: 15px 28px;
}

.btn-large {
  padding: 18px 42px;
  font-size: 1.08rem;
}

/* ==========================================================
   01. Typography Components
========================================================== */

.section-title {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 3vw + 1rem, 3rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.section-intro {
  max-width: 720px;
  margin-right: auto;
  margin-left: auto;
  color: var(--color-muted);
}

/* ==========================================================
   02. Section Badge
========================================================== */

.section-badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  max-width: 100%;
  margin-bottom: 1rem;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--color-primary-border-subtle);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-primary-strong);
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ==========================================================
   03. CTA Components
========================================================== */

.section-cta {
  margin-top: 2.5rem;
  text-align: center;
}

.cta-button {
  min-height: 58px;
  margin-top: 2.15rem;
  padding: 1.15rem 2.3rem;
  font-size: 1.05rem;
}

.cta-button-light {
  margin-top: 2rem;
}

.cta-features {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 42px;
}

.cta-feature {
  background: var(--color-surface);
  padding: 12px 18px;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
}

@media (max-width: 768px) {
  .cta-features {
    flex-direction: column;
    align-items: center;
  }
}

.cta-note {
  display: block;
  margin-top: 24px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* ==========================================================
   04. FAQ Component
========================================================== */

/* ----------------------------------------------------------
   04.1 FAQ Notice
---------------------------------------------------------- */

.faq-notice {
  max-width: 46rem;
  margin: 1.75rem auto 0;
  padding: 0.875rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.faq-notice p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-notice strong {
  color: var(--color-text);
}

/* ----------------------------------------------------------
   04.2 FAQ List
---------------------------------------------------------- */

.faq-list {
  display: grid;
  gap: 1rem;
  max-width: 53.75rem;
  margin: 3.125rem auto 0;
}

/* ----------------------------------------------------------
   04.3 FAQ Item
---------------------------------------------------------- */

.faq-item {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  overflow: clip;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--color-primary-border-medium);
}

.faq-item[open] {
  border-color: var(--color-primary-border-medium);
  box-shadow: var(--shadow-soft);
}

/* ----------------------------------------------------------
   04.4 FAQ Question
---------------------------------------------------------- */

.faq-item summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 1.25rem;
  min-width: 0;
  padding: 1.375rem 1.625rem;
  color: var(--color-text);
  font-weight: 600;
  line-height: 1.45;
  list-style: none;
  cursor: pointer;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::marker {
  content: "";
}

.faq-item summary::after {
  content: "+";
  display: grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  color: var(--color-primary);
  font-size: 1.4rem;
  font-weight: 500;
  line-height: 1;
  transition:
    color var(--transition-fast),
    transform var(--transition-fast);
}

.faq-item[open] summary::after {
  content: "–";
}

.faq-item summary:hover::after,
.faq-item summary:focus-visible::after {
  color: var(--color-primary-hover);
}

.faq-item summary:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: -2px;
}

/* ----------------------------------------------------------
   04.5 FAQ Answer
---------------------------------------------------------- */

.faq-answer {
  display: grid;
  gap: 1rem;
  min-width: 0;
  padding: 0 1.625rem 1.5rem;
}

.faq-answer p {
  margin: 0;
  padding: 0;
  color: var(--color-muted);
  line-height: 1.7;
}

/* ----------------------------------------------------------
   04.6 Mobile
---------------------------------------------------------- */

@media (max-width: 700px) {
  .faq-list {
    gap: 0.75rem;
    margin-top: 2.25rem;
  }

  .faq-item summary {
    gap: 1rem;
    padding: 1.15rem 1.25rem;
    font-size: 1rem;
    line-height: 1.45;
  }

  .faq-item summary::after {
    width: 1.5rem;
    height: 1.5rem;
    font-size: 1.3rem;
  }

  .faq-answer {
    gap: 0.9rem;
    padding: 0 1.25rem 1.25rem;
  }

  .faq-answer p {
    font-size: 0.98rem;
    line-height: 1.65;
  }
}

/* FAQ Download Card */

.faq-download-card {
  margin: 0 1.625rem 1.625rem;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.faq-download-card h3 {
  margin: 0 0 0.625rem;
  font-size: 1rem;
}

.faq-download-card p {
  margin: 0 0 1.25rem;
  padding: 0;
}

.faq-download-card .btn {
  width: fit-content;
}

@media (max-width: 700px) {
  .faq-item summary {
    padding: 20px;
  }

  .faq-action {
    padding: 0 1.25rem 1.375rem;
  }

  .faq-action .btn {
    width: 100%;
    justify-content: center;
  }
}

/* FAQ Help Card */
.faq-help-card {
  margin: 1rem 1.625rem 0;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.faq-help-card h3 {
  margin: 0 0 0.625rem;
  font-size: 1rem;
}

.faq-help-card p {
  margin: 0 0 1.25rem;
  padding: 0;
}

.faq-help-card .btn {
  width: fit-content;
}

.faq-more {
  margin-top: 2rem;
  text-align: center;
}

.faq-more p {
  margin: 0;
  color: var(--color-muted);
  line-height: 1.8;
}

.faq-more strong {
  color: var(--color-text);
}

.faq-more a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.faq-more a:hover {
  text-decoration-thickness: 2px;
}

.faq-download-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;

  color: var(--color-primary);
  font-weight: 600;

  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.faq-download-link:hover {
  text-decoration-thickness: 2px;
}

/* ==========================================================
   05. Text Links
========================================================== */

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;

  width: fit-content;
  max-width: 100%;

  color: var(--color-primary);
  font-weight: 600;
  line-height: 1.45;

  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;

  transition: color var(--transition-fast);
}

.text-link span {
  flex: 0 0 auto;
  transition: transform var(--transition-fast);
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--color-primary-hover);
}

.text-link:hover span,
.text-link:focus-visible span {
  transform: translateX(3px);
}

/* ==========================================================
 Mobile Sticky CTA Landingpage
========================================================== */

.sticky-button {
  display: none;
}

@media (max-width: 768px) {
  .sticky-button {
    position: fixed;
    right: 0.9rem;
    bottom: 0;
    left: 0.9rem;
    z-index: 999;

    display: flex;
    min-height: 3.75rem;
    padding: 1.05rem 1.25rem calc(1.05rem + env(safe-area-inset-bottom));

    border-radius: 12px 12px 0 0;
    text-align: center;

    opacity: 0;
    visibility: hidden;
    transform: translateY(100%);
    pointer-events: none;

    transition:
      opacity var(--transition-fast),
      visibility var(--transition-fast),
      transform var(--transition-fast),
      background var(--transition-fast),
      box-shadow var(--transition-fast);
  }

  .sticky-button.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }
}

/* ==========================================================
   Scroll-to-Top
========================================================== */

.scroll-to-top {
  position: fixed;
  right: clamp(1rem, 2.5vw, 2rem);
  bottom: clamp(1rem, 2.5vw, 2rem);
  z-index: 900;

  display: grid;
  place-items: center;

  width: 3rem;
  height: 3rem;
  padding: 0;

  border: 1px solid var(--color-primary-border-faint);
  border-radius: var(--radius-pill);

  background: var(--color-bg);
  color: var(--color-primary);

  box-shadow: var(--shadow-medium);
  cursor: pointer;

  opacity: 0;
  visibility: hidden;
  transform: translateY(0.75rem);

  transition:
    opacity var(--transition-fast),
    visibility var(--transition-fast),
    transform var(--transition-fast),
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
}

.scroll-to-top[hidden] {
  display: grid;
}

.scroll-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top:hover,
.scroll-to-top:focus-visible {
  border-color: var(--color-primary-hover);
  background: var(--color-primary-hover);
  color: var(--color-on-primary);
  transform: translateY(-2px);
}

.scroll-to-top:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 3px;
}

.scroll-to-top svg {
  display: block;
  width: 1.125rem;
  height: 1.125rem;
}

/* ==========================================================
   Horizontal Navigation Controls
========================================================== */

.horizontal-nav {
  min-width: 0;
}

.horizontal-nav-control {
  display: none;
}

@media (max-width: 900px) {
  .horizontal-nav {
    display: grid;
    grid-template-columns:
      2.5rem
      minmax(0, 1fr)
      2.5rem;
    align-items: center;
    gap: 0.45rem;
    width: 100%;
    min-width: 0;
  }

  .horizontal-nav-track {
    min-width: 0;
  }

  .horizontal-nav-control {
    display: grid;
    place-items: center;

    width: 2.5rem;
    height: 2.5rem;
    padding: 0;

    border: 1px solid var(--color-primary-border-soft);
    border-radius: var(--radius-pill);

    background: var(--color-bg);
    color: var(--color-primary);

    cursor: pointer;

    transition:
      color var(--transition-fast),
      background var(--transition-fast),
      border-color var(--transition-fast),
      opacity var(--transition-fast);
  }

  .horizontal-nav-control:hover,
  .horizontal-nav-control:focus-visible {
    border-color: var(--color-primary);
    background: var(--color-primary-soft);
    color: var(--color-primary-hover);
  }

  .horizontal-nav-control:focus-visible {
    outline: 2px solid var(--color-focus-ring);
    outline-offset: 2px;
  }

  .horizontal-nav-control:disabled {
    opacity: 0.28;
    cursor: default;
    pointer-events: none;
  }

  .horizontal-nav-control svg {
    display: block;
    width: 1rem;
    height: 1rem;
  }
}

@media (max-width: 700px) {
  .scroll-to-top {
    right: 1rem;
    bottom: calc(env(safe-area-inset-bottom) + 1.5rem);
    width: 2.75rem;
    height: 2.75rem;
    border-width: 2px;
    border-color: var(--color-primary);
  }

  .horizontal-nav {
    grid-template-columns:
      2.35rem
      minmax(0, 1fr)
      2.35rem;
    gap: 0.35rem;
  }

  .horizontal-nav-control {
    width: 2.35rem;
    height: 2.35rem;
    border-width: 2px;
    border-color: var(--color-primary);
  }

  .faq-download-card {
    margin: 0 1.25rem 1.375rem;
    padding: 1.25rem;
  }

  .faq-download-card .btn {
    width: 100%;
    justify-content: center;
  }

  .faq-help-card {
    margin: 1rem 1.25rem 0;
    padding: 1.25rem;
  }

  .faq-help-card .btn {
    width: 100%;
    justify-content: center;
  }
}