/* ===========================
   Navigation (Split-Ziel: navigation.css)
=========================== */

.sidebar {
  position: fixed;
  top: var(--viewport-top-gap, 2px);
  left: 0;
  z-index: 40;
  width: var(--sidebar-width, 270px);
  max-width: 100vw;
  height: calc(100vh - var(--viewport-top-gap, 2px));
  overflow-y: auto;

  background: linear-gradient(180deg, #061127 0%, #07152f 52%, #041026 100%);
  color: #fff;

  padding: 18px 16px 24px;

  border-right: 1px solid rgba(255,255,255,0.06);
}

.sidebar.rail {
  width: 88px;
  padding: 12px 10px 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.site-shell .rail__brand {
  display: grid;
  gap: 6px;
  justify-items: center;
  width: 100%;
  padding: 2px 2px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}

.site-shell .rail__brand-icon {
  width: 68px;
  height: 68px;
  border: 0;
  background: transparent;
  padding: 1px;
  object-fit: contain;
  object-position: center;
  filter: brightness(1.08) saturate(0.9);
}

.site-shell .rail__brandline {
  display: grid;
  grid-template-columns: 1fr;
  justify-items: center;
  gap: 3px;
  color: rgba(255,255,255,0.78);
  font-size: 0.70rem;
  line-height: 1.1;
  text-align: center;
  width: 100%;
}

.site-title {
  display: grid;
  grid-auto-flow: row;
  justify-items: center;
  align-content: center;
  gap: 2px;
  width: 100%;
}

.site-title .title-main {
  display: block;
  font-weight: 650;
  line-height: 1.12;
  letter-spacing: 0.015em;
}

.site-title .title-separator {
  display: block;
  line-height: 1;
  opacity: 0.72;
}

.site-title .title-sub {
  display: block;
  line-height: 1.1;
  opacity: 0.8;
}

.site-shell .rail__brand-text,
.site-shell .rail__brand-dot {
  display: block;
  width: 100%;
}

.site-shell .rail__nav {
  display: grid;
  gap: 4px;
  width: 100%;
  justify-items: center;
  padding-top: 2px;
}

.site-shell .rail-link {
  width: 58px;
  height: 52px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: background 0.2s ease, border-color 0.2s ease, opacity 0.2s ease;
}

.site-shell .rail-link:hover,
.site-shell .rail-link:focus-visible {
  text-decoration: none;
  border-color: rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.06);
  outline: none;
}

.site-shell .rail-link:focus-visible {
  box-shadow: var(--ui-focus-ring);
}

.site-shell .rail-link.is-active {
  border-color: rgba(255,255,255,0.24);
  background: rgba(255,255,255,0.20);
}

.site-shell .rail-link__icon {
  width: 22px;
  height: 22px;
  filter: brightness(0) invert(1);
  opacity: 0.96;
}

.site-shell .rail-link:not(.is-active) .rail-link__icon {
  opacity: 0.90;
}

.site-shell .rail-link__glyph {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.96);
  opacity: 0.96;
}

.site-shell .rail-link:not(.is-active) .rail-link__glyph {
  opacity: 0.90;
}

.site-shell .rail-link__label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.topbar,
.mobile-nav-overlay,
.mobile-nav-drawer {
  display: none;
}

:root {
  --mobile-topbar-height: 56px;
  --mobile-content-top-gap: 24px;
  --nav-icon-size: 24px;
  --nav-icon-size-emphasis: 28px;
}

@media (max-width: 1080px) {
  .site-shell {
    --sidebar-width: 0px;
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar.rail {
    display: none;
  }

  .topbar {
    position: fixed;
    top: calc(env(safe-area-inset-top, 0px) + var(--viewport-top-gap, 2px));
    left: 0;
    right: 0;
    z-index: 70;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    min-height: var(--mobile-topbar-height);
    padding: 8px 10px;
    background: linear-gradient(180deg, rgba(4, 7, 12, 0.96), rgba(6, 9, 15, 0.9));
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transform: translateY(0);
    opacity: 1;
    transition: transform var(--ui-motion-duration) var(--ui-motion-ease), opacity var(--ui-motion-duration) var(--ui-motion-ease);
  }

  .topbar.is-hidden {
    transform: translateY(calc(-100% - 8px));
    opacity: 0;
  }

  .topbar__brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: rgba(245, 248, 255, 0.95);
    text-decoration: none;
    min-width: 0;
    padding: 2px 4px 2px 0;
  }

  .topbar__brand-icon {
    width: 38px;
    height: 38px;
    object-fit: contain;
    object-position: center;
    flex: 0 0 auto;
  }

  .topbar__brand-text {
    font-family: var(--font-ui);
    font-size: 0.84rem;
    letter-spacing: 0.02em;
    white-space: normal;
    line-height: 1.08;
    text-align: left;
  }

  .topbar__brand-text.site-title {
    justify-items: start;
    gap: 1px;
  }

  .topbar__brand-text .title-main {
    font-size: 1em;
  }

  .topbar__brand-text .title-separator,
  .topbar__brand-text .title-sub {
    font-size: 0.76em;
  }

  .topbar__menu-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 38px;
    min-width: 38px;
    border: 1px solid rgba(255, 255, 255, 0.22);
    border-radius: var(--ui-radius-control);
    padding: 0 10px;
    background: rgba(255, 255, 255, 0.08);
    color: rgba(245, 248, 255, 0.95);
    font: inherit;
    cursor: pointer;
    transition: background-color var(--ui-motion-duration) var(--ui-motion-ease), border-color var(--ui-motion-duration) var(--ui-motion-ease), transform var(--ui-motion-press-duration) var(--ui-motion-ease), box-shadow var(--ui-motion-duration) var(--ui-motion-ease);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
  }

  .topbar__menu-button:hover,
  .topbar__menu-button:focus-visible {
    background: rgba(255, 255, 255, 0.16);
    border-color: rgba(255, 255, 255, 0.35);
  }

  .topbar__menu-button:focus-visible {
    outline: none;
    box-shadow: var(--ui-focus-ring);
  }

  .topbar__menu-button:active {
    transform: scale(var(--ui-press-scale));
  }

  .topbar__menu-icon {
    font-size: 1.1rem;
    line-height: 1;
  }

  .topbar__menu-label {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 600;
  }

  .mobile-nav-overlay {
    position: fixed;
    inset: calc(var(--mobile-topbar-height) + env(safe-area-inset-top, 0px)) 0 0;
    z-index: 60;
    display: block;
    background: rgba(2, 5, 10, 0.5);
    opacity: 1;
    transition: opacity var(--ui-motion-duration) var(--ui-motion-ease);
  }

  .mobile-nav-overlay[hidden] {
    display: block;
    opacity: 0;
    pointer-events: none;
  }

  .mobile-nav-drawer {
    position: fixed;
    top: calc(var(--mobile-topbar-height) + env(safe-area-inset-top, 0px));
    left: 0;
    right: 0;
    z-index: 65;
    display: block;
    padding: var(--space-3);
    transform: translateY(0);
    transition: transform var(--ui-motion-duration) var(--ui-motion-ease), opacity var(--ui-motion-duration) var(--ui-motion-ease);
  }

  .mobile-nav-drawer[hidden] {
    display: block;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
  }

  .mobile-nav {
    display: grid;
    gap: var(--space-2);
    width: min(100%, 620px);
    margin: 0 auto;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: linear-gradient(180deg, rgba(8, 14, 27, 0.98), rgba(7, 12, 24, 0.96));
    box-shadow: var(--ui-shadow-raised);
  }

  .mobile-nav__link {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    min-height: 52px;
    padding: 0 14px;
    border-radius: var(--ui-radius-control);
    color: rgba(245, 248, 255, 0.96);
    text-decoration: none;
    transition: background-color var(--ui-motion-duration) var(--ui-motion-ease), border-color var(--ui-motion-duration) var(--ui-motion-ease), transform var(--ui-motion-press-duration) var(--ui-motion-ease), box-shadow var(--ui-motion-duration) var(--ui-motion-ease);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
  }

  .mobile-nav__link:hover,
  .mobile-nav__link:focus-visible {
    background: rgba(255, 255, 255, 0.11);
    text-decoration: none;
  }

  .mobile-nav__link:focus-visible {
    outline: none;
    box-shadow: var(--ui-focus-ring);
  }

  .mobile-nav__link.is-active {
    background: rgba(255, 255, 255, 0.18);
  }

  .mobile-nav__link:active {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(var(--ui-press-scale));
  }

  .mobile-nav__icon {
    width: var(--nav-icon-size);
    height: var(--nav-icon-size);
    flex: 0 0 var(--nav-icon-size);
  }

  .mobile-nav__glyph {
    width: var(--nav-icon-size);
    height: var(--nav-icon-size);
    flex: 0 0 var(--nav-icon-size);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-ui);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: rgba(245, 248, 255, 0.96);
  }

  .mobile-nav__label {
    font-family: var(--font-ui);
    font-size: 0.95rem;
    overflow-wrap: anywhere;
  }

  body.mobile-nav-open {
    overflow: hidden;
    touch-action: none;
  }

  .main {
    padding-top: calc(
      var(--mobile-topbar-height) + env(safe-area-inset-top, 0px) + var(--mobile-content-top-gap)
    );
  }
}

@media (max-width: 720px) {
  .topbar {
    padding: 6px 8px;
  }

  .topbar__brand {
    gap: 6px;
  }

  .topbar__brand-icon {
    width: 34px;
    height: 34px;
  }

  .topbar__menu-button {
    min-height: 36px;
    min-width: 36px;
    padding: 0 9px;
  }

  .main {
    padding-top: calc(
      var(--mobile-topbar-height) + env(safe-area-inset-top, 0px) + var(--mobile-content-top-gap)
    );
  }
}


/* ===========================
   Navigation: Brand / Logo
=========================== */

.brand {
  display: flex;
  align-items: center;
  gap: 14px;

  border-bottom: 1px solid rgba(255,255,255,0.14);

  padding-bottom: 18px;
  margin-bottom: 18px;
}

.brand-logo-wrap {

  width: 72px;
  height: 72px;
  flex: 0 0 72px;

  display: grid;
  place-items: center;

  background: rgba(255,255,255,0.08);

  border: 1px solid rgba(255,255,255,0.14);

  border-radius: 16px;
}

.brand-logo {

  width: 56px;
  height: 56px;

  object-fit: contain;

  display: block;
}

.brand-text h1 {
  font-size: 1.05rem;
  margin: 0 0 6px;
  line-height: 1.2;
  color: #ffffff;
}

.brand-text p {
  margin: 0;
  color: rgba(255,255,255,0.78);
  font-size: 0.95rem;
}


/* ===========================
   Navigation: Linkbereiche
=========================== */

.nav-group {

  margin-bottom: 14px;

  background: rgba(255,255,255,0.04);

  border: 1px solid rgba(255,255,255,0.09);

  border-radius: 16px;

  overflow: hidden;
}

.nav-group summary {
  padding: 16px 16px;

  font-weight: 700;

  display: flex;

  justify-content: space-between;

  align-items: center;
}

.nav-group summary a {
  color: inherit;
  text-decoration: none;
  display: block;
  line-height: 1.35;
  text-wrap: pretty;
  overflow-wrap: break-word;
}

.nav-group summary a.active {
  color: #ffffff;
}

.nav-group summary::-webkit-details-marker {
  display: none;
}

.nav-group summary::after {
  content: "+";
  font-size: 1.2rem;
}

.nav-group[open] summary::after {
  content: "−";
}

.nav-links {

  padding: 8px 10px 14px;

  display: grid;

  gap: 6px;
}

.nav-links a {

  color: #e5e7eb;

  display: block;

  padding: 12px 14px;

  border-radius: 12px;

  font-size: 1rem;
  line-height: 1.35;
  text-wrap: pretty;
  overflow-wrap: break-word;

  transition: background 0.15s ease, transform 0.15s ease;
}

.nav-links a:hover {

  background: rgba(255,255,255,0.08);

  text-decoration: none;

  transform: translateX(2px);
}

.nav-links a.active {

  background: rgba(255,255,255,0.14);

  color: #ffffff;
}

.nav-links a[href="Uebungen.html"] {
  font-weight: 700;
}


.nav-subgroup {
  margin: 4px 0 0;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 12px;
  background: rgba(255,255,255,0.04);
}

.nav-subgroup summary {
  padding: 10px 12px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
}


.nav-subgroup summary a {
  color: inherit;
  text-decoration: none;
  display: block;
  line-height: 1.35;
  text-wrap: pretty;
  overflow-wrap: break-word;
}

.nav-subgroup summary a.active {
  color: #ffffff;
}
.nav-subgroup summary::-webkit-details-marker {
  display: none;
}

.nav-subgroup summary::after {
  content: "+";
  float: right;
}

.nav-subgroup[open] summary::after {
  content: "−";
}

.nav-sub-links {
  display: grid;
  gap: 6px;
  padding: 0 8px 10px;
}

.nav-sub-links a {
  color: #e5e7eb;
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 0.95rem;
  line-height: 1.35;
  text-wrap: pretty;
  overflow-wrap: break-word;
  transition: background 0.15s ease, transform 0.15s ease;
}

.nav-sub-links a:hover {
  background: rgba(255,255,255,0.08);
  text-decoration: none;
  transform: translateX(2px);
}

.nav-sub-links a.active {
  background: rgba(255,255,255,0.14);
  color: #ffffff;
}

.nav-placeholder {
  display: block;
  padding: 8px 10px;
  border-radius: 8px;
  color: rgba(255,255,255,0.7);
  font-size: 0.92rem;
}



body.phase15-main .content-block p,
body.phase15-main .content-block ul,
body.phase15-main .content-block li {
  font-size: 1rem;
}

body.phase15-main .content-block ul {
  margin: 0;
  padding-left: var(--space-5);
}

body.phase15-main .accordion a,
body.phase15-main .hero a {
  color: #d4e4ff;
  text-decoration: underline;
  text-underline-offset: 0.14em;
  text-decoration-thickness: 0.08em;
}

body.phase15-main .accordion a:hover,
body.phase15-main .hero a:hover {
  color: #f3f8ff;
}

/* ==========================================================
   Design Transfer Layer (Redesign-Prototyp → Main-Page)
   ========================================================== */
:root {
  --rail-width: 80px;
  --content-max: 1040px;
  --content-reading-max: 920px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-xl: 24px;

  --line-soft: rgba(216, 221, 230, 0.42);
  --line-strong: rgba(221, 227, 239, 0.62);
  --glass-box-bg: linear-gradient(180deg, rgba(243, 248, 255, 0.09), rgba(230, 238, 255, 0.05));
  --glass-box-bg-strong: linear-gradient(180deg, rgba(243, 248, 255, 0.12), rgba(230, 238, 255, 0.07));
  --glass-box-border: rgba(216, 221, 230, 0.36);
  --glass-box-shadow: 0 14px 30px rgba(7, 12, 22, 0.26);
  --glass-box-blur: 4px;

  --color-text: #ebf0fb;
  --color-text-soft: rgba(217, 225, 240, 0.78);
  --color-accent: #8cb2ff;

  --font-ui: "Inter", "Segoe UI", "Arial", sans-serif;
  --font-body: "Inter", "Segoe UI", "Arial", sans-serif;
  --font-heading: "Inter Tight", "Inter", "Segoe UI", "Arial", sans-serif;
  --font-mono: "JetBrains Mono", "Intel One Mono", "SFMono-Regular", "Consolas", monospace;

  --fs-ui-sm: 0.8125rem;
  --fs-ui: 0.875rem;
  --fs-meta: 0.9375rem;
  --fs-h1: clamp(2rem, 4vw, 3rem);
  --fs-h2: clamp(1.6rem, 2.8vw, 2rem);

  --lh-tight: 1.2;
  --lh-body: 1.6;
}

.site-shell {
  --sidebar-width: var(--rail-width);
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
}

.sidebar.rail {
  width: var(--rail-width);
  padding: var(--space-3) var(--space-2) var(--space-5);
  gap: var(--space-4);
  background: linear-gradient(180deg, rgba(4, 7, 12, 0.92), rgba(6, 9, 15, 0.86));
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: inset -1px 0 0 rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-shell .rail__brand {
  min-height: 156px;
  gap: 10px;
  padding: var(--space-3) var(--space-2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.site-shell .rail__brand-icon {
  width: 48px;
  height: 48px;
  padding: 0;
  filter: none;
}

.site-shell .rail__brandline {
  gap: 1px;
  font-family: var(--font-ui);
  font-size: 0.64rem;
  letter-spacing: 0.02em;
  color: rgba(237, 241, 251, 0.86);
}

.site-shell .rail__brandline .title-main {
  font-size: 0.9em;
  letter-spacing: 0;
  white-space: nowrap;
  overflow-wrap: normal;
  word-break: normal;
}

.site-shell .rail__brandline .title-separator,
.site-shell .rail__brandline .title-sub {
  font-size: 0.82em;
}

.site-shell .rail__nav {
  gap: var(--space-3);
  padding-top: var(--space-2);
}

.site-shell .rail-link {
  width: 44px;
  min-width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: rgba(245, 248, 255, 0.94);
  background: transparent;
  border: 0;
  border-radius: var(--ui-radius-control);
  padding: 0;
  transition: background-color var(--ui-motion-duration) var(--ui-motion-ease), border-color var(--ui-motion-duration) var(--ui-motion-ease), transform var(--ui-motion-press-duration) var(--ui-motion-ease), box-shadow var(--ui-motion-duration) var(--ui-motion-ease);
}

.site-shell .rail-link:hover,
.site-shell .rail-link:focus-visible {
  background: rgba(255, 255, 255, 0.08);
  transform: var(--ui-lift-hover);
}

.site-shell .rail-link:focus-visible {
  outline: none;
  box-shadow: var(--ui-focus-ring);
}

.site-shell .rail-link.is-active,
.site-shell .rail-link[data-active='true'] {
  background: rgba(255, 255, 255, 0.14);
}

.site-shell .rail-link__icon {
  width: var(--nav-icon-size);
  height: var(--nav-icon-size);
  filter: none;
  opacity: 1;
}

.site-shell .rail-link__glyph--e,
.site-shell .rail-link__glyph--q {
  width: var(--nav-icon-size-emphasis);
  height: var(--nav-icon-size-emphasis);
  font-size: 1.12rem;
}

.site-shell .rail-link__label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}


body.phase15-main .hero .eyebrow a,
body.phase15-main .hero .hero__eyebrow a,
body.phase15-main .hero .eyebrow-link {
  color: inherit;
  text-decoration: none;
}

body.phase15-main .hero .eyebrow a:hover,
body.phase15-main .hero .hero__eyebrow a:hover,
body.phase15-main .hero .eyebrow-link:hover,
body.phase15-main .hero .eyebrow a:focus-visible,
body.phase15-main .hero .hero__eyebrow a:focus-visible,
body.phase15-main .hero .eyebrow-link:focus-visible {
  color: inherit;
  text-decoration: none;
  opacity: 0.82;
}

@media (max-width: 1080px) {
  .site-shell {
    --sidebar-width: 0px;
    grid-template-columns: minmax(0, 1fr);
  }

  .site-shell > [data-sidebar-mount],
  .site-shell > #app-content,
  .site-shell > .main,
  .site-shell > footer {
    grid-column: 1;
  }

  .sidebar.rail {
    display: none;
  }
}