/* Jev chapter only. Other AI Tutorial pages keep the shared layout. */
.ait-jev .ait-wrap { max-width: 1160px; }

.ait-jev .ait-toc {
    max-height: calc(100vh - 110px);
    overflow-y: auto;
}

.ait-jev .ait-section { scroll-margin-top: 96px; }

.jev-hero {
    position: relative;
    padding: 1.35rem 1.4rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: 18px;
    background:
        radial-gradient(1200px 220px at 100% -20%, color-mix(in srgb, var(--primary) 22%, transparent), transparent 55%),
        linear-gradient(180deg, var(--surface), var(--page-bg));
    overflow: hidden;
}

.jev-hero h1 {
    letter-spacing: -0.03em;
}

.jev-hero h1 span {
    color: var(--primary);
}

.jev-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.7rem;
    margin-top: 1.15rem;
}

.jev-stats div {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.75rem 0.85rem;
}

.jev-stats strong {
    display: block;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}

.jev-stats span {
    display: block;
    margin-top: 0.15rem;
    color: var(--muted);
    font-size: 0.8rem;
}

.jev-pipe {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.55rem;
    margin-top: 1rem;
}

.jev-node,
.jev-outs span {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.55rem 0.75rem;
    font-size: 0.84rem;
    font-weight: 600;
}

.jev-node small,
.jev-outs span small {
    display: block;
    font-weight: 500;
    color: var(--muted);
    font-size: 0.72rem;
}

.jev-node-core {
    background: var(--primary);
    color: #fff;
    border-color: transparent;
    min-width: 7.5rem;
    text-align: center;
}

.jev-node-core small { color: color-mix(in srgb, #fff 78%, transparent); }

.jev-arrow {
    color: var(--primary);
    font-weight: 700;
}

.jev-outs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.jev-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin: 0.9rem 0 0.4rem;
}

.jev-pane {
    border-radius: 12px;
    padding: 0.85rem 0.95rem 0.95rem;
    border: 1px solid var(--border);
    background: var(--surface-2);
}

.jev-pane h3 {
    margin: 0 0 0.45rem;
    font-size: 0.95rem;
}

.jev-pane ol {
    margin: 0;
    padding-left: 1.15rem;
}

.jev-pane li { margin: 0.28rem 0; }

.jev-pane-slow { border-top: 3px solid var(--accent); }
.jev-pane-fast { border-top: 3px solid var(--primary); }

.jev-prims {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.7rem;
    margin: 0.8rem 0 0.3rem;
}

.jev-prim {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.85rem 0.9rem;
    background: var(--surface-2);
}

.jev-prim .jev-k {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 0.35rem;
}

.jev-prim h3 { margin: 0 0 0.35rem; font-size: 1.02rem; }
.jev-prim p { margin: 0; color: var(--muted); font-size: 0.88rem; }

.ait-jev .ait-toc a.jev-toc-ppt {
    margin-top: 0.45rem;
    padding: 0.45rem 0.5rem;
    border-radius: 8px;
    background: color-mix(in srgb, var(--primary) 12%, var(--surface));
    color: var(--primary);
    font-weight: 600;
}

.jev-deck-head {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: flex-end;
    margin-bottom: 0.8rem;
}

.jev-deck-head h2 { margin-bottom: 0.25rem; }
.jev-deck-head p { margin: 0; color: var(--muted); max-width: 38rem; }

.jev-stage {
    position: relative;
    background: #0b1220;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.jev-stage img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 1376 / 768;
    object-fit: contain;
    background: #e8e6e1;
}

.jev-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 2.4rem;
    height: 2.4rem;
    border: 0;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.72);
    color: #fff;
    font-size: 1.15rem;
    cursor: pointer;
}

.jev-nav:hover { background: rgba(15, 23, 42, 0.9); }
.jev-nav.prev { left: 0.6rem; }
.jev-nav.next { right: 0.6rem; }

.jev-deck-bar {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    align-items: center;
    margin-top: 0.7rem;
}

.jev-count {
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    font-size: 0.85rem;
}

.jev-caption { color: var(--muted); font-size: 0.9rem; }

.jev-progress {
    height: 3px;
    background: var(--border);
    border-radius: 99px;
    margin-top: 0.55rem;
    overflow: hidden;
}

.jev-progress span {
    display: block;
    height: 100%;
    background: var(--primary);
    width: 0;
}

.jev-thumbs {
    display: flex;
    gap: 0.4rem;
    overflow-x: auto;
    margin-top: 0.75rem;
    padding-bottom: 0.2rem;
}

.jev-thumbs button {
    flex: 0 0 auto;
    width: 4.6rem;
    border: 2px solid transparent;
    border-radius: 8px;
    padding: 0;
    background: var(--surface-2);
    cursor: pointer;
    overflow: hidden;
}

.jev-thumbs button.is-on { border-color: var(--primary); }

.jev-thumbs img {
    display: block;
    width: 100%;
    height: 2.5rem;
    object-fit: cover;
}

.jev-note {
    margin-top: 0.75rem;
    font-size: 0.84rem;
    color: var(--muted);
}

@media (max-width: 860px) {
    .jev-stats,
    .jev-split,
    .jev-prims { grid-template-columns: 1fr; }
    .jev-deck-head { flex-direction: column; align-items: flex-start; }
    .jev-nav { width: 2rem; height: 2rem; }
}