/* =========================================================================
   Layout — Container, Section, Grid
   ========================================================================= */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* =====================================================================
   MD3 Medium Top App Bar — initial 112 dp, kollabiert auf ~64 dp.
   Trigger: data-app-bar-collapsed via Scroll-Listener in app.js.
   ===================================================================== */

.app-bar {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  /* Layered Background: surf als Basis, primary-container-tint als Overlay.
     Universalen Browser-Support — kein color-mix noetig. Visuell identisch
     zu color-mix(in srgb, primary-container 38%/8%, surf). */
  background:
    linear-gradient(
      to bottom,
      rgba(var(--primary-container-rgb), 0.38) 0%,
      rgba(var(--primary-container-rgb), 0.08) 100%
    ),
    var(--surf);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid rgba(var(--primary-rgb), 0.14);
  color: var(--on-primary-container);
  transition: box-shadow var(--motion-short) var(--md-easing-standard);
}

.app-bar[data-app-bar-collapsed="true"] {
  box-shadow: var(--shadow-1);
}

.app-bar__inner {
  display: grid;
  grid-template-areas:
    "brand actions"
    "nav   nav";
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  padding-block: var(--space-3);
  transition: padding var(--motion-medium) var(--md-easing-standard),
              gap var(--motion-medium) var(--md-easing-standard);
}

/* Brand-Area: Avatar + Title-Group */
.app-bar__brand {
  grid-area: brand;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--on-primary-container);
  text-decoration: none;
  min-width: 0;
}

.app-bar__brand:hover {
  text-decoration: none;
}

.app-bar__avatar {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--primary);
  color: var(--on-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: width var(--motion-medium) var(--md-easing-standard),
              height var(--motion-medium) var(--md-easing-standard);
}

.app-bar__avatar .material-symbols-rounded {
  font-size: 24px;
  transition: font-size var(--motion-medium) var(--md-easing-standard);
}

.app-bar__title-group {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.app-bar__title {
  font-size: var(--title-lg);
  font-weight: var(--fw-semibold);
  color: var(--on-primary-container);
  letter-spacing: -0.01em;
  line-height: 1.2;
  transition: font-size var(--motion-medium) var(--md-easing-standard);
}

.app-bar__overline {
  display: block;
  font-size: var(--label-md);
  color: var(--on-primary-container);
  opacity: 0.85;
  letter-spacing: 0;
  max-height: 24px;
  overflow: hidden;
  transition: max-height var(--motion-medium) var(--md-easing-standard),
              opacity var(--motion-short) var(--md-easing-standard);
}

/* Actions rechts — Button-Group als MD3 Pill-Container, Höhe = Pills */
.app-bar__actions {
  grid-area: actions;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0;
  border-radius: var(--radius-full);
  background: rgba(var(--surf-rgb), 0.55);
  border: 1px solid rgba(var(--primary-rgb), 0.12);
}

.app-bar__actions .app-icon-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
}

/* Nav-Row unter dem Brand */
.app-bar__nav {
  grid-area: nav;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
}

@media (min-width: 768px) {
  .app-bar__nav {
    margin-left: calc(40px + var(--space-3)); /* unter Avatar einrücken */
    flex-wrap: nowrap;
  }
}

.app-bar__nav-link {
  padding: 0 var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--label-md);
  font-weight: var(--fw-medium);
  line-height: 1;
  color: var(--on-primary-container);
  background: rgba(var(--surf-rgb), 0.55);
  border: 1px solid rgba(var(--primary-rgb), 0.12);
  transition: background var(--motion-short) var(--md-easing-standard),
              color var(--motion-short) var(--md-easing-standard),
              border-color var(--motion-short) var(--md-easing-standard);
  height: var(--touch-small);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.app-bar__nav-icon {
  font-size: 18px;
  flex-shrink: 0;
}

/* Mobile (< 768 px): Icon-only Pills, Label visually-hidden, Icon
   groesser. Tablets ab 768 px bekommen Labels — die Nav-Row hat dort
   in 2-Zeilen-Layout genug Platz. Erst ab 1024 px erlaubt sich die
   App-Bar das collapsed-Single-Row-Layout (Brand + Nav + Actions in
   einer Zeile) — bis 1023 px bleibt's 2-zeilig, damit nichts gequetscht
   wird. */
@media (max-width: 767px) {
  .app-bar__nav-link {
    padding: 0;
    min-width: var(--touch-small);
    width: var(--touch-small);
    justify-content: center;
  }
  .app-bar__nav-icon {
    font-size: 22px;
  }
  .app-bar__nav-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }
}

/* MD3: Medium App Bar degradiert zur Small App Bar auf Mobile —
   Overline wird ausgeblendet, damit Title + Action-Cluster nicht in
   Konflikt geraten. Brand-Row-Breite, nicht Nav-Row, daher eigene
   Schwelle bei 767 (iPad portrait hat genug Platz fuer Overline). */
@media (max-width: 767px) {
  .app-bar__overline {
    display: none;
  }
}

.app-bar__nav-link:hover {
  background: var(--surf);
  border-color: rgba(var(--primary-rgb), 0.22);
  color: var(--on-primary-container);
  text-decoration: none;
}

/* MD3 Selected-State über aria-current (vom ScrollSpy gesetzt) */
.app-bar__nav-link[aria-current="true"] {
  background: var(--primary);
  color: var(--on-primary);
  border-color: transparent;
}

/* =====================================================================
   Collapsed State — sticky scroll, kompakter Single-Row-Layout
   ===================================================================== */

/* Collapsed Layout: nur auf Desktop in eine Zeile umordnen. Auf Mobile
   und Tablet portrait bleiben Brand-Row und Nav-Row erhalten (sonst
   gibt es Platzprobleme — iPad 820 px konnte Brand+Nav+Actions nicht in
   eine Reihe quetschen). */
@media (min-width: 1024px) {
  .app-bar[data-app-bar-collapsed="true"] .app-bar__inner {
    grid-template-areas: "brand nav actions";
    grid-template-columns: auto 1fr auto;
    padding-block: var(--space-2);
    gap: var(--space-4);
  }
}

.app-bar[data-app-bar-collapsed="true"] .app-bar__inner {
  padding-block: var(--space-2);
}

.app-bar[data-app-bar-collapsed="true"] .app-bar__avatar {
  width: 32px;
  height: 32px;
}

.app-bar[data-app-bar-collapsed="true"] .app-bar__avatar .material-symbols-rounded {
  font-size: 20px;
}

.app-bar[data-app-bar-collapsed="true"] .app-bar__title {
  font-size: var(--title-md);
}

.app-bar[data-app-bar-collapsed="true"] .app-bar__overline {
  max-height: 0;
  opacity: 0;
}

@media (min-width: 1024px) {
  .app-bar[data-app-bar-collapsed="true"] .app-bar__nav {
    justify-content: flex-end;
    margin-left: 0;
  }
}

/* Main scroll-Wrapper */
.page {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  padding-block: var(--space-6) var(--space-7);
}

@media (min-width: 768px) {
  .page {
    gap: var(--space-7);
    padding-block: var(--space-7);
  }
}

/* Section-Wrapper */
.section {
  scroll-margin-top: 80px;
}

.section__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  padding-inline: var(--space-1);
}

.section__title {
  font-size: var(--headline-lg);
  font-weight: var(--fw-semibold);
  letter-spacing: -0.02em;
  color: var(--primary);
}

.section__meta {
  font-size: var(--label-md);
  color: var(--on-surf-muted);
}

.section__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.section__stat {
  /* kompakte Variante der Chip-Klasse für Header-Stats */
  min-height: 32px;
  padding: 4px 12px;
  font-size: var(--label-sm);
  color: var(--on-surf-variant);
}

.section__stat .material-symbols-rounded {
  font-size: 16px;
}

/* 2-Spalten Grid für „Sidekick"-Inhalte */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 600px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}