/* ===== APP SHELL ===== */
.app {
  display: flex;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background: var(--bg-base);
}

/* ===== SIDEBAR ===== */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  z-index: 100;
  transition: transform var(--transition-normal);
}

.sidebar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-md);
}

.sidebar__logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo-text {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.logo-accent {
  color: var(--accent-blue);
}

.logo-subtitle {
  font-size: 12px;
  color: var(--text-secondary);
}

.sidebar__close {
  display: none;
}

.sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: 0 var(--space-sm);
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition-fast);
  width: 100%;
  text-align: left;
}

.nav-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.nav-btn--active {
  background: var(--bg-elevated);
  color: var(--accent-green);
}

.nav-btn--active svg {
  stroke: var(--accent-green);
}

.sidebar__divider {
  height: 1px;
  background: var(--border-subtle);
  margin: var(--space-sm) var(--space-md);
}

/* ===== HISTORY (sidebar) ===== */
.sidebar__history {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 0 var(--space-sm);
}

.sidebar__history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-sm);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.history-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.history-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.history-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.history-item--active {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.history-item__title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-item__delete {
  opacity: 0;
  transition: opacity var(--transition-fast);
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.history-item:hover .history-item__delete {
  opacity: 1;
}

.history-group-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: var(--space-sm) var(--space-sm) var(--space-xs);
  margin-top: var(--space-sm);
}

.history-group-label:first-child {
  margin-top: 0;
}

/* ===== SIDEBAR FOOTER ===== */
.sidebar__footer {
  padding: var(--space-sm);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

/* ===== MAIN PANEL ===== */
.main-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  min-width: 0;
}

/* ===== MAIN HEADER ===== */
.main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  min-height: 52px;
  gap: var(--space-md);
}

.main-header__menu {
  display: none;
}

.main-header__mode {
  flex: 1;
  font-weight: 600;
  font-size: 15px;
}

.main-header__badges {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-xl);
  font-size: 12px;
  font-weight: 600;
}

.badge--distro {
  background: var(--bg-elevated);
  color: var(--accent-green);
  border: 1px solid var(--border-subtle);
}

.badge--lang {
  background: var(--bg-elevated);
  color: var(--accent-blue);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.badge--lang:hover {
  background: var(--bg-hover);
}

/* ===== VIEWS ===== */
.view {
  display: none;
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md);
}

.view--active {
  display: flex;
  flex-direction: column;
}

/* ===== INPUT BAR ===== */
.input-bar {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  padding: var(--space-md);
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
}

.input-bar textarea {
  flex: 1;
  resize: none;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
  max-height: 120px;
  overflow-y: auto;
  transition: border-color var(--transition-fast);
}

.input-bar textarea:focus {
  border-color: var(--border-active);
}

.input-bar textarea::placeholder {
  color: var(--text-tertiary);
}

.btn-send {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-green);
  color: var(--bg-base);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.btn-send:hover:not(:disabled) {
  background: var(--accent-green-dim);
}

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

/* ===== MOBILE BOTTOM NAV ===== */
.mobile-nav {
  display: none;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-xs) 0;
  padding-bottom: env(safe-area-inset-bottom, var(--space-xs));
}

.mobile-nav__btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  flex: 1;
  padding: var(--space-xs);
  font-size: 11px;
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
}

.mobile-nav__btn--active {
  color: var(--accent-green);
}

.mobile-nav__btn--active svg {
  stroke: var(--accent-green);
}

/* ===== ICON BUTTONS ===== */
.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .app {
    flex-direction: column;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    transform: translateX(-100%);
    box-shadow: 4px 0 24px rgba(0,0,0,0.5);
  }

  .sidebar--open {
    transform: translateX(0);
  }

  .sidebar__close {
    display: flex;
  }

  .main-header__menu {
    display: flex;
  }

  .mobile-nav {
    display: flex;
  }

  .input-bar {
    padding: var(--space-sm);
  }

  .view {
    padding: var(--space-sm);
  }
}

@media (max-width: 480px) {
  .main-header__mode {
    font-size: 14px;
  }

  .badge {
    font-size: 11px;
    padding: 2px 8px;
  }
}