.graph-page-shell {
    position: relative;
    z-index: 0;
    min-height: 100vh;
    padding-top: 1.5rem;
    padding-bottom: 3rem;
}

.graph-page-shell::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(circle at top right, rgba(74, 144, 226, 0.18), transparent 28%),
        radial-gradient(circle at top left, rgba(19, 76, 145, 0.24), transparent 36%),
        linear-gradient(180deg, #06111f 0%, #081a31 100%);
}

.graph-page-shell,
.graph-page-shell a,
.graph-page-shell p,
.graph-page-shell li,
.graph-page-shell label,
.graph-page-shell h1,
.graph-page-shell h2,
.graph-page-shell h3,
.graph-page-shell span {
    color: #edf5ff;
}

.graph-page-shell .hero-copy,
.graph-page-shell .graph-note,
.graph-page-shell .feature-card p,
.graph-page-shell .panel p,
.graph-page-shell .prose p {
    color: #c9d7e8;
}

.graph-page-shell h1:focus,
.graph-page-shell h1:focus-visible {
    outline: none;
    box-shadow: none;
}

.graph-page-shell .hero,
.graph-page-shell .panel,
.graph-page-shell .feature-card {
    border-color: rgba(122, 164, 224, 0.2);
    background:
        linear-gradient(145deg, rgba(15, 42, 79, 0.95), rgba(7, 20, 40, 0.98)),
        rgba(11, 31, 59, 0.96);
}

.graph-page-shell .mini-label {
    color: #89d1b6;
}

.graph-page-shell .button-link.secondary {
    color: #edf5ff;
}

.graph-page-shell .button-link.ghost {
    color: #89d1b6;
}

.graph-hero h1 {
    max-width: 14ch;
}

.graph-workbench {
    display: grid;
    grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
    gap: 18px;
    align-items: start;
}

.graph-workbench-single {
    grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
}

.graph-output h2,
.graph-controls h2 {
    margin-bottom: 0.9rem;
}

.graph-label {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-top: 0.85rem;
    color: var(--text);
    font-weight: 600;
}

.graph-inline-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.graph-input {
    min-height: 44px;
    border: 1px solid rgba(122, 164, 224, 0.24);
    border-radius: 12px;
    background: rgba(8, 17, 31, 0.9);
    color: var(--text);
    padding: 0.7rem 0.9rem;
    font-size: 0.98rem;
}

.graph-input:focus {
    outline: 2px solid rgba(137, 209, 182, 0.22);
    border-color: rgba(137, 209, 182, 0.42);
}

.graph-button {
    width: 100%;
    margin-top: 1rem;
}

.graph-note {
    margin-top: 0.9rem;
    color: var(--muted);
    font-size: 0.94rem;
}

.graph-error {
    margin-top: 0.9rem;
    padding: 0.8rem 0.9rem;
    border: 1px solid rgba(242, 109, 109, 0.32);
    border-radius: 14px;
    background: rgba(94, 23, 23, 0.28);
    color: #ffd9d9;
}

.graph-canvas-shell {
    min-height: 36rem;
    padding-top: 0.4rem;
}

.graph-page-shell .plotly-host .main-svg,
.graph-page-shell .plotly-host .svg-container {
    border-radius: 16px;
}

.plotly-host {
    width: 100%;
    min-height: 36rem;
}

.expression-tree-shell {
    overflow: auto;
    padding: 0.6rem 0 0.2rem;
}

.expression-tree-root,
.expression-tree-children {
    list-style: none;
    margin: 0;
    padding: 0;
}

.expression-tree-root {
    display: flex;
    justify-content: center;
}

.expression-tree-children {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.35rem;
    position: relative;
}

.expression-tree-item {
    position: relative;
    padding: 0 0.3rem;
    text-align: center;
}

.expression-tree-item::before {
    content: "";
    position: absolute;
    top: -0.8rem;
    left: 50%;
    width: 1px;
    height: 0.8rem;
    background: rgba(122, 164, 224, 0.35);
}

.expression-tree-root > .expression-tree-item::before {
    display: none;
}

.expression-tree-children::before {
    content: "";
    position: absolute;
    top: -0.8rem;
    left: 12%;
    right: 12%;
    height: 1px;
    background: rgba(122, 164, 224, 0.35);
}

.expression-tree-node {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 4rem;
    padding: 0.65rem 0.9rem;
    border-radius: 999px;
    border: 1px solid rgba(122, 164, 224, 0.24);
    background: linear-gradient(180deg, rgba(15, 42, 79, 0.95), rgba(7, 20, 40, 0.98));
    color: var(--text);
    font-weight: 700;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.22);
}

@media (max-width: 1024px) {
    .graph-workbench,
    .graph-workbench-single {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .graph-inline-grid {
        grid-template-columns: 1fr;
    }

    .graph-canvas-shell,
    .plotly-host {
        min-height: 28rem;
    }

    .expression-tree-children {
        flex-direction: column;
        align-items: center;
    }

    .expression-tree-children::before {
        display: none;
    }
}