/**
 * components.css — Wiederverwendbare UI-Komponenten.
 * Alle Module verwenden AUSSCHLIESSLICH diese Klassen —
 * kein Modul definiert eigene Buttons/Inputs/Cards neu.
 *
 * @author PWA Assistant
 * @since  2026-04-08
 */

/* ============================================================
   LAYOUT
   ============================================================ */

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100dvh;
}

.app-sidebar {
  position: sticky;
  top: 0;
  height: 100dvh;
  background: var(--color-bg-2);
  border-right: 1px solid var(--color-border);
  padding: var(--space-6) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.app-sidebar__brand {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--color-text);
  letter-spacing: -0.02em;
  padding: 0 var(--space-3);
}

.app-sidebar__brand span {
  color: var(--color-accent);
}

.app-main {
  padding: var(--space-8);
  max-width: var(--container-max);
  width: 100%;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
  .app-sidebar {
    position: fixed;
    inset: auto 0 0 0;
    height: auto;
    flex-direction: row;
    border-right: none;
    border-top: 1px solid var(--color-border);
    padding: var(--space-2) var(--space-3);
    z-index: var(--z-sticky);
  }
  .app-sidebar__brand { display: none; }
  .app-main {
    padding: var(--space-4);
    padding-bottom: calc(var(--space-16) + var(--space-8));
  }
}

/* ============================================================
   NAVIGATION
   ============================================================ */

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

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-weight: var(--fw-medium);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-item:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

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

@media (max-width: 768px) {
  .nav {
    flex-direction: row;
    flex: 1;
    justify-content: space-around;
  }
  .nav-item {
    flex-direction: column;
    gap: var(--space-1);
    padding: var(--space-2);
    font-size: var(--fs-xs);
  }
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  min-height: 44px;
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  box-shadow: 0 4px 14px rgba(79, 168, 255, 0.25);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  box-shadow: 0 6px 20px rgba(79, 168, 255, 0.35);
}

.btn-primary:active:not(:disabled) {
  background: var(--color-accent-active);
}

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

.btn-ghost:hover:not(:disabled) {
  background: var(--color-surface-hover);
  border-color: var(--color-border-strong);
}

.btn-danger {
  background: var(--color-error-soft);
  color: var(--color-error);
  border-color: var(--color-error-soft);
}

.btn-danger:hover:not(:disabled) {
  background: var(--color-error);
  color: var(--color-text);
}

.btn-icon {
  padding: var(--space-2);
  min-height: 40px;
  min-width: 40px;
}

/* ============================================================
   INPUTS
   ============================================================ */

.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.input-label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
}

.input,
.textarea,
.select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  min-height: 44px;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  color: var(--color-text);
  background: var(--color-bg-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.input:hover,
.textarea:hover,
.select:hover {
  border-color: var(--color-border-strong);
}

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--focus-ring);
  background: var(--color-bg-4);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-text-subtle);
}

.textarea {
  min-height: 120px;
  resize: vertical;
  line-height: var(--lh-normal);
}

.input-error {
  font-size: var(--fs-xs);
  color: var(--color-error);
}

/* ============================================================
   CARDS
   ============================================================ */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
}

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

.card-title {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
}

/* ============================================================
   MODAL
   ============================================================ */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(7, 11, 24, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: grid;
  place-items: center;
  padding: var(--space-4);
  z-index: var(--z-modal);
  animation: fade-in var(--transition-normal);
}

.modal {
  background: var(--color-bg-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 520px;
  max-height: 90dvh;
  overflow-y: auto;
  animation: slide-up var(--transition-normal);
}

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

.modal-title {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
}

.modal-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
  margin-top: var(--space-6);
}

/* ============================================================
   TOAST
   ============================================================ */

.toast-container {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  z-index: var(--z-toast);
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background: var(--color-bg-4);
  border: 1px solid var(--color-border-strong);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  box-shadow: var(--shadow-lg);
  color: var(--color-text);
  min-width: 260px;
  max-width: 400px;
  animation: slide-in-right var(--transition-normal);
}

.toast-success { border-left-color: var(--color-success); }
.toast-warning { border-left-color: var(--color-warning); }
.toast-error   { border-left-color: var(--color-error); }

/* ============================================================
   SPINNER
   ============================================================ */

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border-strong);
  border-top-color: var(--color-accent);
  border-radius: var(--radius-full);
  animation: spin 800ms linear infinite;
}

.spinner-lg {
  width: 40px;
  height: 40px;
  border-width: 3px;
}

/* ============================================================
   EMPTY STATE
   ============================================================ */

.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;
  color: var(--color-text-muted);
}

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

.empty-state__title {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
}

/* ============================================================
   BADGES / CHIPS
   ============================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  border-radius: var(--radius-full);
  background: var(--color-surface-hover);
  color: var(--color-text-muted);
}

.badge-accent  { background: var(--color-accent-soft);  color: var(--color-accent); }
.badge-success { background: var(--color-success-soft); color: var(--color-success); }
.badge-warning { background: var(--color-warning-soft); color: var(--color-warning); }
.badge-error   { background: var(--color-error-soft);   color: var(--color-error); }

/* ============================================================
   ANIMATIONS
   ============================================================ */

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slide-up {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slide-in-right {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Auth view */
.auth-view {
  max-width: 420px;
  margin: var(--space-16) auto;
}
.auth-view .input-group { margin-bottom: var(--space-4); }
.auth-view .input-group--last { margin-bottom: var(--space-6); }
.auth-view .btn-block { width: 100%; }
.auth-view__switch {
  margin-top: var(--space-5);
  text-align: center;
  color: var(--color-text-muted);
}

/* Noscript / offline / standalone pages */
.noscript-card {
  margin: 2rem;
  max-width: 500px;
}
.offline-main {
  display: grid;
  place-items: center;
  min-height: 100dvh;
}
.offline-card {
  max-width: 420px;
  text-align: center;
}
.offline-card .empty-state { padding: var(--space-6) 0; }
.offline-card .empty-state__icon { font-size: 3rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}