/* si.css
   Scoped styles for the Structural Interaction project page.
   Every selector is prefixed .si- or lives under .si-scope so it never
   collides with the main site stylesheet (css/style.css).
   Semantic colors are accents only, used by the interactive components. */

.si-scope {
    --user: #E0A23C;        /* User (amber) */
    --imperative: #DD6B4F;  /* Imperative rule (coral) */
    --declarative: #3E6BD6; /* Declarative rule (blue) */
    --element: #3DA35D;     /* Element (green) */
    --rigidity: #3E6BD6;
    --enforcement: #DD6B4F;

    --si-surface: #1c1c1c;
    --si-surface-2: #232323;
    --si-border: rgba(229, 231, 235, 0.14);
    --si-border-strong: rgba(229, 231, 235, 0.28);
    --si-radius: 14px;
}

/* Generic section rhythm */
.si-section {
    margin-top: var(--lg-gap);
}

/* Generic toggle used by the interactive components */
.si-scope .is-hidden {
    display: none !important;
}

.si-prose {
    max-width: 760px;
    margin-top: var(--sm-gap);
}

/* Components are allowed to breathe wider than the reading column */
.si-wide .si-explorer,
.si-wide .si-sandbox {
    margin-top: var(--md-gap);
}

/* ---------- Title block ---------- */
.si-titleblock {
    margin-top: var(--md-gap);
}

.si-title {
    color: var(--title-font-color);
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.25;
    max-width: 900px;
}

.si-venue {
    color: var(--muted-color);
    margin-top: 8px;
}

.si-authors {
    margin-top: var(--sm-gap);
    line-height: 1.7;
}

.si-authors .si-author-name {
    color: var(--title-font-color);
    font-weight: 600;
}

.si-authors .si-author-aff {
    color: var(--muted-color);
    font-size: var(--sm-font-size);
}

/* ---------- Hero / teaser ---------- */
.si-hero {
    position: relative;
    margin-top: var(--lg-gap);
    border: 1px solid var(--si-border);
    border-radius: var(--si-radius);
    background: var(--si-surface);
    overflow: hidden;
    min-height: 220px;
    display: flex;
    align-items: center;
}

.si-hero-content {
    position: relative;
    padding: var(--md-gap);
}

.si-tagline {
    color: var(--title-font-color);
    font-size: 1.5rem;
    font-weight: 600;
    font-style: italic;
    line-height: 1.4;
    white-space: nowrap;
}

.si-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: var(--sm-gap);
    padding: 8px 16px;
    border-radius: 8px;
    background: var(--primary-color);
    color: #121212;
    font-weight: 600;
}

.si-cta:hover {
    background: var(--light-color);
    text-decoration: none;
}

/* ---------- Links bar ---------- */
.si-linksbar {
    margin-top: var(--md-gap);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}

.si-linksbar .si-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border: 1px solid var(--si-border-strong);
    border-radius: 8px;
    color: var(--font-color);
    font-weight: 500;
    font-size: var(--sm-font-size);
}

.si-linksbar .si-link:hover {
    background: rgba(255, 255, 255, 0.05);
    text-decoration: none;
}

.si-linksbar .si-link i {
    color: var(--primary-color);
}

.si-linksbar .si-link-group-label {
    color: var(--muted-color);
    font-size: var(--sm-font-size);
    margin-left: 8px;
}

/* ---------- State badges (reused across explorer and use cases) ---------- */
.si-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: var(--sm-font-size);
    font-weight: 600;
    line-height: 1.5;
    white-space: nowrap;
    border: 1px solid transparent;
}

.si-badge--rigidity {
    background: rgba(62, 107, 214, 0.18);
    color: #aec4f5;
    border-color: rgba(62, 107, 214, 0.5);
}

.si-badge--enforcement {
    background: rgba(221, 107, 79, 0.18);
    color: #f0b3a3;
    border-color: rgba(221, 107, 79, 0.5);
}

.si-couple {
    display: inline-flex;
    gap: 6px;
    flex-wrap: wrap;
    align-items: center;
}

/* ---------- The two dimensions ---------- */
.si-axes {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--md-gap);
    margin-top: var(--md-gap);
}

.si-axis {
    border: 1px solid var(--si-border);
    border-radius: var(--si-radius);
    background: var(--si-surface);
    padding: var(--sm-gap);
}

.si-axis h3 {
    display: flex;
    align-items: center;
    gap: 8px;
}

.si-axis--rigidity h3::before,
.si-axis--enforcement h3::before {
    content: '';
    width: 10px;
    height: 10px;
    border-radius: 3px;
}

.si-axis--rigidity h3::before { background: var(--rigidity); }
.si-axis--enforcement h3::before { background: var(--enforcement); }

.si-axis-summary {
    color: var(--muted-color);
    font-size: var(--sm-font-size);
    margin-bottom: var(--sm-gap);
}

.si-axis-scale {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.si-axis-step {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 10px;
    align-items: baseline;
    padding: 8px;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: default;
    transition: background-color 0.15s, border-color 0.15s;
}

.si-axis-step:hover,
.si-axis-step:focus-within {
    background: var(--si-surface-2);
    border-color: var(--si-border);
}

.si-axis-step .si-step-value {
    font-weight: 600;
    color: var(--title-font-color);
    font-size: var(--sm-font-size);
}

.si-axis-step .si-step-def {
    font-size: var(--sm-font-size);
}

.si-axis-step .si-step-example {
    display: block;
    color: var(--muted-color);
    font-size: var(--sm-font-size);
    margin-top: 2px;
}

.si-axis-arrow {
    display: flex;
    justify-content: space-between;
    color: var(--muted-color);
    font-size: var(--sm-font-size);
    margin-top: 8px;
    padding: 0 8px;
}

/* ---------- Explorer (centerpiece) ---------- */
.si-explorer {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(240px, 1fr);
    gap: var(--md-gap);
    align-items: start;
}

.si-explorer-gridwrap {
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-rows: auto 1fr;
    gap: 8px;
}

.si-col-headers {
    grid-column: 2;
    grid-row: 1;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
}

.si-row-headers {
    grid-column: 1;
    grid-row: 2;
    display: grid;
    grid-template-rows: repeat(4, 1fr);
    gap: 6px;
}

.si-grid {
    grid-column: 2;
    grid-row: 2;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 6px;
}

.si-axis-label {
    font-size: var(--sm-font-size);
    color: var(--muted-color);
    font-weight: 600;
}

.si-axis-label.si-axis-label--col {
    grid-column: 2;
    grid-row: 0;
}

.si-header-cell {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6px 4px;
    font-size: var(--sm-font-size);
    font-weight: 600;
    border-radius: 8px;
    border: 1px solid var(--si-border);
    background: var(--si-surface);
    cursor: help;
    position: relative;
}

.si-header-cell--col { color: #f0b3a3; }
.si-header-cell--row { color: #aec4f5; writing-mode: horizontal-tb; }

.si-row-headers .si-header-cell {
    justify-content: flex-start;
    padding-left: 10px;
    min-width: 92px;
}

.si-header-cell:hover,
.si-header-cell:focus-visible {
    border-color: var(--si-border-strong);
    background: var(--si-surface-2);
    outline: none;
}

.si-cell {
    display: flex;
    flex-direction: column;
    gap: 2px;
    text-align: left;
    padding: 10px;
    min-height: 86px;
    border-radius: 10px;
    border: 1px solid var(--si-border);
    background: var(--si-surface);
    color: var(--font-color);
    cursor: pointer;
    font-family: inherit;
    transition: border-color 0.15s, background-color 0.15s, transform 0.1s;
}

.si-cell:hover {
    border-color: var(--si-border-strong);
    background: var(--si-surface-2);
}

.si-cell:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.si-cell.is-active {
    border-color: var(--primary-color);
    background: var(--si-surface-2);
}

.si-cell .si-cell-name {
    color: var(--title-font-color);
    font-weight: 600;
    font-size: var(--sm-font-size);
    line-height: 1.3;
}

.si-cell .si-cell-tool {
    color: var(--muted-color);
    font-size: var(--sm-font-size);
}

/* subtle 2D encoding: corner dot intensity by position, never affects text */
.si-cell .si-cell-dot {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    opacity: 0.55;
}

.si-cell { position: relative; }

/* Detail panel */
.si-detail {
    border: 1px solid var(--si-border);
    border-radius: var(--si-radius);
    background: var(--si-surface);
    padding: var(--md-gap);
    position: sticky;
    top: 90px;
}

.si-detail h3 {
    margin-bottom: 6px;
}

.si-detail .si-detail-tool {
    color: var(--muted-color);
    font-size: var(--sm-font-size);
    margin-bottom: var(--sm-gap);
}

.si-detail .si-couple {
    margin-bottom: var(--sm-gap);
}

/* Per-cell illustration from the poster, shown on a light card so every
   drawing reads well regardless of its own background. */
.si-detail-figure {
    margin: 0 0 var(--sm-gap);
    background: #ffffff;
    border-radius: 10px;
    border: 1px solid var(--si-border);
    padding: 10px;
}

.si-detail-figure img {
    display: block;
    width: 100%;
    height: auto;
}

.si-detail .si-detail-text {
    font-size: var(--md-font-size);
}

.si-detail .si-detail-hint {
    color: var(--muted-color);
    font-size: var(--sm-font-size);
}

/* ---------- Sandbox "Feel the rule" ---------- */
.si-sandbox {
    border: 1px solid var(--si-border);
    border-radius: var(--si-radius);
    background: var(--si-surface);
    padding: var(--md-gap);
}

.si-sandbox-stage {
    position: relative;
    display: flex;
    height: 200px;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--si-border);
    background: var(--si-surface-2);
    touch-action: none;
}

.si-panel {
    background: rgba(62, 107, 214, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #aec4f5;
    font-size: var(--sm-font-size);
    font-weight: 600;
    overflow: hidden;
    white-space: nowrap;
}

.si-panel-right {
    flex: 1;
    background: rgba(255, 255, 255, 0.02);
    color: var(--muted-color);
}

.si-divider {
    width: 10px;
    flex: 0 0 10px;
    background: var(--primary-color);
    cursor: ew-resize;
    position: relative;
    z-index: 3;
}

.si-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 2px;
    height: 28px;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 2px;
}

.si-divider:focus-visible {
    outline: 2px solid var(--light-color);
    outline-offset: 2px;
}

.si-limit-line {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 0;
    border-left: 2px dashed rgba(221, 107, 79, 0.8);
    z-index: 2;
    pointer-events: none;
}

.si-limit-line.si-limit-max {
    border-left-color: rgba(61, 163, 93, 0.85);
}

.si-limit-line.is-hidden {
    display: none;
}

.si-limit-grab {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 14px;
    transform: translateX(-7px);
    z-index: 4;
    cursor: ew-resize;
}

.si-sandbox-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--md-gap);
    margin-top: var(--md-gap);
}

.si-control h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: var(--md-font-size);
}

.si-control--rigidity h3::before,
.si-control--enforcement h3::before {
    content: '';
    width: 10px;
    height: 10px;
    border-radius: 3px;
}

.si-control--rigidity h3::before { background: var(--rigidity); }
.si-control--enforcement h3::before { background: var(--enforcement); }

.si-segmented {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
}

.si-segmented button {
    flex: 1 1 auto;
    padding: 6px 10px;
    border-radius: 8px;
    border: 1px solid var(--si-border);
    background: var(--si-surface-2);
    color: var(--font-color);
    font-family: inherit;
    font-size: var(--sm-font-size);
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.15s, background-color 0.15s;
}

.si-segmented button:hover {
    border-color: var(--si-border-strong);
}

.si-segmented button:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.si-segmented button.is-selected {
    background: var(--primary-color);
    color: #121212;
    border-color: var(--primary-color);
}

.si-control-hint {
    color: var(--muted-color);
    font-size: var(--sm-font-size);
    margin-top: 8px;
    min-height: 2.6em;
}

.si-liftable-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    font-size: var(--sm-font-size);
}

.si-sandbox-readout {
    margin-top: var(--md-gap);
    padding: var(--sm-gap);
    border-radius: 10px;
    background: var(--si-surface-2);
    border: 1px solid var(--si-border);
}

.si-sandbox-readout .si-couple {
    margin-bottom: 6px;
}

.si-sandbox-readout .si-readout-text {
    font-size: var(--md-font-size);
    color: var(--title-font-color);
}

/* ---------- Directed graph ---------- */
.si-graph-figure {
    margin-top: var(--md-gap);
    border: 1px solid var(--si-border);
    border-radius: var(--si-radius);
    background: var(--si-surface);
    padding: var(--md-gap);
}

.si-graph svg {
    width: 100%;
    height: auto;
    max-height: 470px;
}

.si-graph .si-node text {
    fill: #121212;
    font-family: inherit;
    font-weight: 600;
    font-size: 13px;
}

.si-graph .si-edge-text {
    fill: var(--font-color);
    font-size: 11px;
    font-weight: 500;
}

.si-graph-caption {
    margin-top: var(--sm-gap);
    color: var(--muted-color);
    font-size: var(--sm-font-size);
}

/* ---------- Use cases ---------- */
.si-usecases {
    display: flex;
    flex-direction: column;
    gap: var(--md-gap);
    margin-top: var(--md-gap);
}

.si-usecase {
    border: 1px solid var(--si-border);
    border-radius: var(--si-radius);
    background: var(--si-surface);
    padding: var(--md-gap);
}

.si-usecase h3 {
    margin-bottom: var(--sm-gap);
}

.si-usecase-toggle {
    display: inline-flex;
    gap: 4px;
    padding: 4px;
    border-radius: 10px;
    background: var(--si-surface-2);
    border: 1px solid var(--si-border);
    margin-bottom: var(--sm-gap);
}

.si-usecase-toggle button {
    padding: 6px 16px;
    border: none;
    border-radius: 7px;
    background: none;
    color: var(--font-color);
    font-family: inherit;
    font-size: var(--sm-font-size);
    font-weight: 600;
    cursor: pointer;
}

.si-usecase-toggle button:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.si-usecase-toggle button.is-selected {
    background: var(--primary-color);
    color: #121212;
}

.si-usecase-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    gap: var(--md-gap);
    align-items: start;
}

.si-usecase-figure {
    border: 1px solid var(--si-border);
    border-radius: 10px;
    background: var(--si-surface-2);
    overflow: hidden;
}

.si-usecase-figure svg {
    width: 100%;
    height: auto;
    display: block;
}

.si-usecase-states {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: var(--sm-gap);
}

.si-usecase-state {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.si-usecase-state .si-state-name {
    color: var(--title-font-color);
    font-weight: 600;
    font-size: var(--sm-font-size);
    min-width: 110px;
}

/* ---------- Why it matters ---------- */
.si-why {
    max-width: 820px;
    margin-top: var(--sm-gap);
    padding-left: 1.2em;
    display: flex;
    flex-direction: column;
    gap: var(--sm-gap);
}

.si-abstract {
    max-width: 820px;
}

/* ---------- Cite ---------- */
.si-cite {
    position: relative;
    margin-top: var(--sm-gap);
}

.si-bibtex {
    border: 1px solid var(--si-border);
    border-radius: var(--si-radius);
    background: var(--si-surface);
    padding: var(--md-gap);
    overflow-x: auto;
    font-family: monospace;
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--font-color);
    white-space: pre;
}

.si-copy {
    position: absolute;
    top: 10px;
    right: 10px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--si-border-strong);
    border-radius: 8px;
    background: var(--si-surface-2);
    color: var(--font-color);
    font-family: inherit;
    font-size: var(--sm-font-size);
    font-weight: 600;
    cursor: pointer;
    z-index: 2;
}

.si-copy:hover {
    background: rgba(255, 255, 255, 0.06);
}

.si-copy:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.si-copy i {
    color: var(--primary-color);
}

.si-copy.is-copied {
    color: var(--element);
    border-color: var(--element);
}

.si-copy.is-copied i {
    color: var(--element);
}

/* ---------- Active internal nav link ---------- */
.si-nav-link.is-current {
    text-decoration: underline;
    text-decoration-style: dotted;
    color: var(--primary-color);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    /* The one-line tagline only fits above this width, so let it wrap below it. */
    .si-tagline {
        white-space: normal;
    }

    .si-explorer {
        grid-template-columns: 1fr;
    }

    .si-detail {
        position: static;
    }

    .si-axes {
        grid-template-columns: 1fr;
    }

    .si-sandbox-controls {
        grid-template-columns: 1fr;
    }

    .si-usecase-body {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .si-title { font-size: 1.6rem; }
    .si-tagline { font-size: 1.2rem; }

    /* Explorer stays usable: shrink text and let tracks shrink to fit */
    .si-grid { gap: 4px; min-width: 0; }
    .si-col-headers { gap: 4px; min-width: 0; }
    .si-cell { min-height: 72px; padding: 7px; min-width: 0; }
    .si-cell .si-cell-name { font-size: 0.7rem; overflow-wrap: anywhere; }
    .si-cell .si-cell-tool { font-size: 0.66rem; overflow-wrap: anywhere; }
    .si-row-headers .si-header-cell { min-width: 52px; padding-left: 6px; font-size: 0.66rem; overflow-wrap: anywhere; }
    .si-header-cell--col { font-size: 0.66rem; padding: 4px 2px; }
    .si-explorer-gridwrap { gap: 5px; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    .si-scope * {
        transition: none !important;
        animation: none !important;
    }
}