/* App shell: sidebar, view area, responsive bottom bar. */

.shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  height: 100dvh;
  transition: grid-template-columns 0.3s var(--ease);
}

.shell.collapsed {
  grid-template-columns: var(--sidebar-w-collapsed) minmax(0, 1fr);
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 16px 12px;
  border-right: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  overflow: hidden;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  min-height: 44px;
  padding: 0 6px;
}

.brand-logo {
  flex: none;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 11px;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 6px 18px color-mix(in srgb, var(--accent) 40%, transparent);
}

.brand-text {
  flex: 1;
  min-width: 0;
  line-height: 1.2;
}

.brand-name {
  font-weight: 750;
  letter-spacing: -0.01em;
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--text-3);
}

.nav {
  display: grid;
  gap: 4px;
}

.nav-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 13px;
  width: 100%;
  height: 44px;
  padding: 0 13px;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--text-2);
  font-weight: 600;
  font-size: 0.93rem;
  text-align: left;
  white-space: nowrap;
  transition: background 0.2s, color 0.2s, transform 0.15s var(--ease);
}

.nav-item:hover {
  background: var(--surface-3);
  color: var(--text);
}

.nav-item:active {
  transform: scale(0.98);
}

.nav-item.active {
  color: var(--text);
  background: color-mix(in srgb, var(--accent) 16%, transparent);
}

.nav-item.active::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(var(--accent), var(--accent-2));
  animation: fade-in 0.3s ease;
}

.nav-item.active .nav-icon {
  color: var(--accent);
}

.nav-icon {
  display: grid;
  place-items: center;
  flex: none;
}

.nav-label {
  flex: 1;
  transition: opacity 0.2s;
}

.nav-badge {
  display: grid;
  place-items: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  border-radius: 99px;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-ink);
  background: var(--accent);
}

.nav-badge.pop {
  animation: badge-pop 0.4s var(--ease-spring);
}

.sidebar-foot {
  display: grid;
  gap: 4px;
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.shell.collapsed .brand-text,
.shell.collapsed .nav-label {
  display: none;
}

.shell.collapsed .brand {
  flex-direction: column;
  gap: 8px;
  padding: 0;
}

.shell.collapsed .nav-item {
  justify-content: center;
  padding: 0;
}

.shell.collapsed .nav-badge {
  position: absolute;
  top: 3px;
  right: 6px;
  min-width: 18px;
  height: 18px;
  font-size: 0.65rem;
}

.shell.collapsed .nav-item.active::before {
  left: -12px;
}

.view {
  min-width: 0;
  height: 100dvh;
  overflow: auto;
  outline: none;
}

.page {
  max-width: 1280px;
  margin: 0 auto;
  padding: 32px 36px 48px;
}

.page-enter {
  animation: fade-up 0.4s var(--ease);
}

.page-chat {
  max-width: none;
  height: 100%;
  padding: 0;
}

.page-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.page-head p {
  margin-top: 4px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

/* ---------------------------------------------------------------- mobile */

@media (max-width: 900px) {
  .page {
    padding: 24px 20px 40px;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .shell,
  .shell.collapsed {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    inset: auto 0 0 0;
    z-index: 80;
    height: var(--bottom-bar-h);
    padding: 6px 10px calc(6px + env(safe-area-inset-bottom));
    border-right: 0;
    border-top: 1px solid var(--border);
    flex-direction: row;
    gap: 0;
  }

  .brand,
  .sidebar-foot {
    display: none;
  }

  .nav {
    grid-auto-flow: column;
    grid-auto-columns: 1fr;
    width: 100%;
    gap: 2px;
  }

  .nav-item,
  .shell.collapsed .nav-item {
    flex-direction: column;
    justify-content: center;
    gap: 2px;
    height: 100%;
    padding: 0;
    font-size: 0.68rem;
  }

  .nav-label,
  .shell.collapsed .nav-label {
    display: block;
    flex: none;
  }

  .nav-item.active::before {
    left: 24%;
    right: 24%;
    top: -7px;
    bottom: auto;
    width: auto;
    height: 3px;
    border-radius: 0 0 3px 3px;
  }

  .nav-badge,
  .shell.collapsed .nav-badge {
    position: absolute;
    top: 2px;
    right: calc(50% - 22px);
  }

  .view {
    height: calc(100dvh - var(--bottom-bar-h));
  }

  .page {
    padding: 20px 16px 28px;
  }

  h1 {
    font-size: 1.4rem;
  }

  .toasts {
    bottom: calc(var(--bottom-bar-h) + 12px);
  }
}