/**
 * Modul: Layout
 * Zweck: App-Shell-Layout, Navigation (Bottom Mobile / Sidebar Desktop), Responsive Grid
 * Abhängigkeiten: tokens.css, reset.css
 */

/* --------------------------------------------------------
 * App-Shell
 * -------------------------------------------------------- */
.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

/* --------------------------------------------------------
 * Loading-Screen
 * -------------------------------------------------------- */
.app-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  background-color: var(--color-bg);
}

.app-loading__logo {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* --------------------------------------------------------
 * Layout: Mobile (Standard, < 1024px)
 * -------------------------------------------------------- */
.app-content {
  flex: 1;
  padding-bottom: calc(var(--nav-height-mobile) + var(--safe-area-inset-bottom));
  overflow-y: auto;
}

/* --------------------------------------------------------
 * Bottom Navigation (Mobil + Tablet)
 * -------------------------------------------------------- */
.nav-bottom {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: calc(var(--nav-height-mobile) + var(--safe-area-inset-bottom));
  padding-bottom: var(--safe-area-inset-bottom);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  z-index: var(--z-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-bottom__items {
  display: flex;
  width: 100%;
  height: 100%;
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-1);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  min-height: unset; /* Reset des Touch-Target-Minimums für Nav-Items */
}

.nav-item[aria-current="page"] {
  color: var(--color-accent);
}

.nav-item__icon {
  width: 24px;
  height: 24px;
}

.nav-item__label {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-medium);
}

/* --------------------------------------------------------
 * Sidebar Navigation (Desktop, > 1024px)
 * -------------------------------------------------------- */
@media (min-width: 1024px) {
  .app-shell {
    flex-direction: row;
  }

  .app-content {
    flex: 1;
    padding-bottom: 0;
    margin-left: var(--sidebar-width);
  }

  .nav-bottom {
    display: none;
  }

  .nav-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background-color: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    z-index: var(--z-nav);
    padding: var(--space-6) 0;
  }

  .nav-sidebar__logo {
    font-size: var(--text-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-accent);
    padding: 0 var(--space-6) var(--space-6);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--space-4);
  }

  .nav-sidebar__items {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    padding: 0 var(--space-3);
    flex: 1;
  }

  .nav-sidebar .nav-item {
    flex-direction: row;
    justify-content: flex-start;
    border-radius: var(--radius-sm);
    padding: var(--space-3) var(--space-3);
    gap: var(--space-3);
    min-height: 44px;
  }

  .nav-sidebar .nav-item[aria-current="page"] {
    background-color: var(--color-accent-light);
    color: var(--color-accent);
  }

  .nav-sidebar .nav-item:hover:not([aria-current="page"]) {
    background-color: var(--color-surface-2);
  }

  .nav-sidebar .nav-item__label {
    font-size: var(--text-base);
  }
}

/* --------------------------------------------------------
 * Seiten-Container
 * -------------------------------------------------------- */
.page {
  padding: var(--space-4);
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.page__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  gap: var(--space-4);
}

.page__title {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
}

@media (min-width: 1024px) {
  .page {
    padding: var(--space-8);
  }
}

/* --------------------------------------------------------
 * Cards
 * -------------------------------------------------------- */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card--padded {
  padding: var(--space-4);
}

/* --------------------------------------------------------
 * Buttons
 * -------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--text-base);
  font-weight: var(--font-weight-medium);
  min-height: 44px;
  transition: opacity var(--transition-fast), background-color var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-accent);
  color: #ffffff;
}

.btn--primary:hover {
  background-color: var(--color-accent-hover);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
}

.btn--danger {
  background-color: var(--color-danger);
  color: #ffffff;
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
}

.btn--ghost:hover {
  background-color: var(--color-surface-2);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn--icon {
  padding: var(--space-2);
  min-height: 44px;
  min-width: 44px;
  border-radius: var(--radius-sm);
}

/* FAB (Floating Action Button) */
.fab {
  position: fixed;
  bottom: calc(var(--nav-height-mobile) + var(--safe-area-inset-bottom) + var(--space-4));
  right: var(--space-4);
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background-color: var(--color-accent);
  color: #ffffff;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: calc(var(--z-nav) - 1);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.fab:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

@media (min-width: 1024px) {
  .fab {
    bottom: var(--space-8);
  }
}

/* --------------------------------------------------------
 * Form-Elemente
 * -------------------------------------------------------- */
.input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  font-size: var(--text-base);
  transition: border-color var(--transition-fast);
  min-height: 44px;
}

.input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.input::placeholder {
  color: var(--color-text-disabled);
}

.label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
}

/* --------------------------------------------------------
 * Skeleton-Loading
 * -------------------------------------------------------- */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-border) 25%,
    var(--color-surface-2) 50%,
    var(--color-border) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --------------------------------------------------------
 * Leer-Zustände (Empty States)
 * -------------------------------------------------------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-12) var(--space-6);
  text-align: center;
}

.empty-state__icon {
  width: 64px;
  height: 64px;
  color: var(--color-text-disabled);
}

.empty-state__title {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.empty-state__description {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  max-width: 280px;
}

/* --------------------------------------------------------
 * Responsive Grid
 * -------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}

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

@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
}

/* --------------------------------------------------------
 * Toast-Benachrichtigungen
 * -------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: calc(var(--nav-height-mobile) + var(--safe-area-inset-bottom) + var(--space-4));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: var(--z-toast);
  pointer-events: none;
  width: min(calc(100% - var(--space-8)), 400px);
}

@media (min-width: 1024px) {
  .toast-container {
    bottom: var(--space-6);
    left: calc(var(--sidebar-width) + 50%);
  }
}

.toast {
  background-color: var(--color-text-primary);
  color: var(--color-bg);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: toast-in 0.2s ease forwards;
}

.toast--success { background-color: var(--color-success); color: #fff; }
.toast--danger  { background-color: var(--color-danger);  color: #fff; }
.toast--warning { background-color: var(--color-warning); color: #fff; }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}