/* AI Tutorial pages — theme-aware study material */
.ait-page {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--page-bg);
    color: var(--page-fg);
    min-height: 100vh;
}

.ait-wrap {
    max-width: 1080px;
    margin: 0 auto;
    padding: 6.25rem 1.25rem 4rem;
}

.ait-crumb {
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 1.1rem;
}

.ait-crumb a {
    color: var(--primary);
    text-decoration: none;
}

.ait-crumb a:hover { text-decoration: underline; }

.ait-hero {
    margin-bottom: 1.75rem;
}

.ait-kicker {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    padding: 0.28rem 0.7rem;
    border-radius: 999px;
    margin-bottom: 0.7rem;
}

.ait-hero h1 {
    font-size: clamp(1.9rem, 4vw, 2.7rem);
    line-height: 1.15;
    margin: 0 0 0.6rem;
}

.ait-lead {
    font-size: 1.08rem;
    line-height: 1.6;
    color: var(--muted);
    max-width: 46rem;
    margin: 0;
}

.ait-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.ait-pill {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--page-fg);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.28rem 0.65rem;
}

.ait-path {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
    margin: 1.5rem 0 2rem;
}

.ait-path a {
    display: block;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.85rem 0.95rem;
    text-decoration: none;
    color: var(--page-fg);
}

.ait-path a strong {
    display: block;
    font-size: 0.78rem;
    color: var(--primary);
    margin-bottom: 0.2rem;
}

.ait-path a span {
    font-size: 0.92rem;
    font-weight: 600;
}

.ait-group {
    margin-bottom: 2rem;
}

.ait-group h2 {
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 0.75rem;
}

.ait-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 0.85rem;
}

.ait-card {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 1rem 1.05rem 1.05rem;
    text-decoration: none;
    color: var(--page-fg);
    min-height: 168px;
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.ait-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.ait-card-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
}

.ait-tag {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--primary);
}

.ait-level {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--muted);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.12rem 0.45rem;
}

.ait-card h3 {
    margin: 0;
    font-size: 1.15rem;
}

.ait-card p {
    margin: 0;
    color: var(--muted);
    font-size: 0.92rem;
    line-height: 1.45;
}

.ait-layout {
    display: grid;
    grid-template-columns: 210px 1fr;
    gap: 1.75rem;
    align-items: start;
}

.ait-toc {
    position: sticky;
    top: 88px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.85rem 0.9rem;
}

.ait-toc p {
    margin: 0 0 0.45rem;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--muted);
}

.ait-toc a {
    display: block;
    color: var(--page-fg);
    text-decoration: none;
    font-size: 0.84rem;
    padding: 0.28rem 0;
    line-height: 1.35;
}

.ait-toc a:hover { color: var(--primary); }

.ait-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 1.25rem 1.3rem 1.35rem;
    margin-bottom: 1rem;
}

.ait-section h2 {
    margin: 0 0 0.7rem;
    font-size: 1.28rem;
}

.ait-section h3 {
    margin: 1.15rem 0 0.4rem;
    font-size: 1.05rem;
}

.ait-section p,
.ait-section li {
    line-height: 1.65;
    font-size: 0.98rem;
}

.ait-section p { margin: 0.45rem 0 0.7rem; }

.ait-section ul,
.ait-section ol {
    margin: 0.3rem 0 0.8rem;
    padding-left: 1.2rem;
}

.ait-callout {
    background: var(--surface-2);
    border-left: 3px solid var(--accent);
    border-radius: 8px;
    padding: 0.75rem 0.9rem;
    margin: 0.8rem 0;
}

.ait-callout strong { color: var(--accent); }

.ait-analogy {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem 0.9rem;
    margin: 0.75rem 0;
    line-height: 1.55;
}

.ait-label {
    display: block;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.ait-diagram {
    margin: 0.85rem 0 1rem;
    padding: 0.85rem 0.9rem 0.95rem;
    border: 1px dashed var(--border);
    border-radius: 12px;
    background: var(--surface-2);
}

.ait-flow,
.ait-branches {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
}

.ait-flow span,
.ait-branches span,
.ait-stack div {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--page-fg);
    border-radius: 8px;
    padding: 0.42rem 0.65rem;
    font-size: 0.82rem;
    font-weight: 600;
    line-height: 1.35;
}

.ait-flow i,
.ait-branches i {
    color: var(--primary);
    font-style: normal;
    font-weight: 700;
}

.ait-stack {
    display: grid;
    gap: 0.35rem;
}

.ait-stack div { border-left: 3px solid var(--primary); }

.ait-split {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 0.55rem;
    align-items: center;
}

.ait-split ul {
    margin: 0;
    padding-left: 1.1rem;
    font-size: 0.86rem;
}

.ait-code-label {
    margin: 0.8rem 0 0.15rem;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--muted);
}

.ait-table-wrap { overflow-x: auto; margin: 0.6rem 0 0.9rem; }

.ait-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.ait-table th,
.ait-table td {
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 0.55rem;
}

.ait-table th {
    font-size: 0.75rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--muted);
}

.ait-code {
    background: #0f172a;
    color: #e2e8f0;
    border-radius: 10px;
    padding: 0.9rem 1rem;
    overflow-x: auto;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.82rem;
    line-height: 1.55;
    margin: 0.6rem 0 0.9rem;
}

.ait-code .c { color: #94a3b8; }

.ait-usecase {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.8rem 0.9rem;
    margin: 0.7rem 0;
    background: var(--surface-2);
}

.ait-usecase h3 { margin-top: 0; }

.ait-checks { list-style: none; padding-left: 0; }
.ait-checks li { padding-left: 1.4rem; position: relative; margin: 0.35rem 0; }
.ait-checks li::before { content: "☐"; position: absolute; left: 0; color: var(--primary); }

.ait-next {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    margin-top: 1.2rem;
}

.ait-next a {
    flex: 1;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.8rem 0.95rem;
    text-decoration: none;
    color: var(--page-fg);
}

.ait-next a small {
    display: block;
    color: var(--muted);
    font-size: 0.75rem;
    margin-bottom: 0.15rem;
}

.ait-source {
    margin-top: 1.4rem;
    font-size: 0.88rem;
    color: var(--muted);
}

.ait-source a { color: var(--primary); }

@media (max-width: 860px) {
    .ait-path { grid-template-columns: 1fr 1fr; }
    .ait-layout { grid-template-columns: 1fr; }
    .ait-toc { position: static; }
    .ait-next { flex-direction: column; }
}