.ai-shell {
  position: fixed;
  inset: 0;
  z-index: 44;
  display: grid;
  place-items: center;
  padding: 18px;
}

.ai-shell--hidden {
  display: none;
}

.ai-shell__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 52, 0.22);
  backdrop-filter: blur(8px);
}

.ai-workspace {
  --ai-surface: linear-gradient(180deg, #fbfcff 0%, #f4f7ff 100%);
  --ai-accent-glow: rgba(92, 122, 255, 0.14);
  --ai-text: #1f2a4f;
  --ai-muted: #7180a6;
  --ai-line: rgba(55, 82, 182, 0.14);
  --ai-chip-fill: rgba(51, 80, 212, 0.06);
  --ai-chip-border: rgba(51, 80, 212, 0.14);
  --ai-chip-hover: rgba(51, 80, 212, 0.12);
  --ai-stage-fill: linear-gradient(180deg, rgba(248, 250, 255, 0.9), rgba(240, 245, 255, 0.9));
  --ai-shadow: 0 26px 72px rgba(25, 39, 92, 0.18);
  position: relative;
  width: min(1320px, 100%);
  max-height: calc(100vh - 36px);
  display: grid;
  grid-template-rows: auto 1fr;
  overflow: hidden;
  border-radius: 30px;
  background:
    radial-gradient(circle at top left, var(--ai-accent-glow), transparent 34%),
    var(--ai-surface);
  color: var(--ai-text);
  box-shadow: var(--ai-shadow);
  border: 1px solid var(--ai-line);
}

.ai-workspace__header {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
  padding: 24px 26px 18px;
  border-bottom: 1px solid var(--ai-line);
}

.ai-workspace__header h2 {
  margin: 0 0 8px;
  font-size: 30px;
}

.ai-workspace__header p {
  margin: 0;
  color: var(--ai-muted);
  max-width: 760px;
  line-height: 1.5;
  text-wrap: pretty;
}

.ai-header-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.ai-chip {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--ai-chip-fill);
  border: 1px solid var(--ai-chip-border);
  color: color-mix(in srgb, var(--ai-text) 88%, var(--ai-muted));
  font-size: 13px;
}

.ai-chip--link {
  text-decoration: none;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.ai-chip--link:hover {
  background: var(--ai-chip-hover);
  border-color: color-mix(in srgb, var(--blue-600) 28%, var(--ai-chip-border));
  color: var(--ai-text);
}

.ai-chip--hidden {
  display: none;
}

.ai-workspace__body {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 0;
}

.ai-nav {
  padding: 24px 18px 24px 24px;
  border-right: 1px solid var(--ai-line);
  display: grid;
  align-content: start;
  gap: 22px;
}

.ai-nav__group {
  display: grid;
  gap: 10px;
}

.ai-nav__label {
  color: var(--ai-muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.ai-nav__button {
  width: 100%;
  padding: 14px 16px;
  border: 0;
  border-radius: 16px;
  background: transparent;
  color: color-mix(in srgb, var(--ai-text) 80%, var(--ai-muted));
  text-align: left;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.ai-nav__button:hover {
  background: color-mix(in srgb, var(--blue-600) 8%, transparent);
  color: var(--ai-text);
}

.ai-nav__button--active {
  background: linear-gradient(135deg, rgba(73, 104, 255, 0.18), rgba(73, 104, 255, 0.06));
  color: var(--ai-text);
  box-shadow: inset 0 0 0 1px rgba(121, 145, 255, 0.18);
}

.ai-nav__button strong {
  display: block;
  margin-bottom: 5px;
  font-size: 15px;
}

.ai-nav__button span {
  color: var(--ai-muted);
  font-size: 13px;
  line-height: 1.45;
  text-wrap: pretty;
}

.ai-nav__note {
  padding: 16px;
  border-radius: 18px;
  background: color-mix(in srgb, var(--surface-soft) 88%, transparent);
  border: 1px solid var(--ai-line);
  color: var(--ai-muted);
  line-height: 1.55;
  text-wrap: pretty;
}

.ai-stage {
  min-height: 0;
  overflow: auto;
  padding: 24px;
  background: var(--ai-stage-fill);
}

.ai-view {
  display: grid;
  gap: 18px;
}

.ai-view--hidden {
  display: none;
}

@media (max-width: 1120px) {
  .ai-workspace__body {
    grid-template-columns: 1fr;
  }

  .ai-nav {
    border-right: 0;
    border-bottom: 1px solid var(--ai-line);
  }
}

:root[data-theme='dark'] .ai-shell__backdrop {
  background: rgba(8, 14, 34, 0.58);
}

:root[data-theme='dark'] .ai-workspace {
  --ai-surface: linear-gradient(180deg, #121935 0%, #0f1731 100%);
  --ai-accent-glow: rgba(92, 122, 255, 0.18);
  --ai-text: #eef3ff;
  --ai-muted: rgba(228, 236, 255, 0.72);
  --ai-line: rgba(137, 157, 255, 0.14);
  --ai-chip-fill: rgba(255, 255, 255, 0.06);
  --ai-chip-border: rgba(137, 157, 255, 0.16);
  --ai-chip-hover: rgba(92, 122, 255, 0.18);
  --ai-stage-fill: linear-gradient(180deg, rgba(10, 16, 34, 0.64), rgba(13, 21, 43, 0.28));
  --ai-shadow: 0 32px 100px rgba(4, 8, 24, 0.5);
  border-color: rgba(137, 157, 255, 0.1);
}