/* Shared tutorial body styles.
 * Single source for every tutorial-*.html and tutorials.html. Site chrome
 * (topbar, nav, footer, theme tokens, .polarization-tabs, .chart-frame) lives
 * in site.css; this file is the body. */

:root {
    --chart-bg: #121315;
    --grid: #33363a;
    --axis: #f4f4f2;
    --metric-r: #009e73;
    --metric-t: #56b4e9;
    --metric-a: #e69f00;
    --metric-bare: #cc6677;
    --metric-ideal: #d55e00;
    --metric-n: #56b4e9;
    --metric-k: #cc6677;
    --series-1: #e69f00;
    --series-2: #56b4e9;
    --series-3: #009e73;
    --series-4: #f0e442;
    --series-5: #0072b2;
    --tutorial-layer-0: #e69f00;
    --tutorial-layer-0-text: #171716;
    --tutorial-layer-1: #56b4e9;
    --tutorial-layer-1-text: #171716;
    --tutorial-layer-2: #009e73;
    --tutorial-layer-2-text: #ffffff;
    --tutorial-layer-3: #f0e442;
    --tutorial-layer-3-text: #171716;
    --tutorial-layer-4: #0072b2;
    --tutorial-layer-4-text: #ffffff;
    --tutorial-layer-5: #d55e00;
    --tutorial-layer-5-text: #ffffff;
    --tutorial-layer-6: #cc79a7;
    --tutorial-layer-6-text: #ffffff;
    --tutorial-layer-7: #bdbdbd;
    --tutorial-layer-7-text: #171716;
    --tutorial-layer: var(--tutorial-layer-0);
    --tutorial-layer-text: var(--tutorial-layer-0-text);
    --tutorial-layer-alt: var(--tutorial-layer-1);
    --tutorial-layer-alt-text: var(--tutorial-layer-1-text);
    --tutorial-incident: #b7bab6;
    --tutorial-incident-text: #171716;
    --tutorial-substrate: #8b5cf6;
    --tutorial-substrate-text: #ffffff;
    --heat-low: #142b42;
    --heat-mid: #2aa198;
    --heat-high: #f2c14e;
}
html[data-theme="light"],
body[data-theme="light"] {
    --chart-bg: #ffffff;
    --grid: #d7dde0;
    --axis: #171716;
    --metric-r: #009e73;
    --metric-t: #0072b2;
    --metric-a: #b66d00;
    --metric-bare: #cc6677;
    --metric-ideal: #d55e00;
    --metric-n: #0072b2;
    --metric-k: #cc6677;
    --series-1: #b66d00;
    --series-2: #0072b2;
    --series-3: #00845f;
    --series-4: #8f7600;
    --series-5: #005f95;
    --tutorial-layer-0: #b66d00;
    --tutorial-layer-0-text: #ffffff;
    --tutorial-layer-1: #0072b2;
    --tutorial-layer-1-text: #ffffff;
    --tutorial-layer-2: #00845f;
    --tutorial-layer-2-text: #ffffff;
    --tutorial-layer-3: #8f7600;
    --tutorial-layer-3-text: #ffffff;
    --tutorial-layer-4: #005f95;
    --tutorial-layer-4-text: #ffffff;
    --tutorial-layer-5: #c24e00;
    --tutorial-layer-5-text: #ffffff;
    --tutorial-layer-6: #a65086;
    --tutorial-layer-6-text: #ffffff;
    --tutorial-layer-7: #5f6870;
    --tutorial-layer-7-text: #ffffff;
    --tutorial-layer: var(--tutorial-layer-0);
    --tutorial-layer-text: var(--tutorial-layer-0-text);
    --tutorial-layer-alt: var(--tutorial-layer-1);
    --tutorial-layer-alt-text: var(--tutorial-layer-1-text);
    --tutorial-incident: #687179;
    --tutorial-incident-text: #ffffff;
    --tutorial-substrate: #5b45c6;
    --tutorial-substrate-text: #ffffff;
    --heat-low: #dbeafe;
    --heat-mid: #2aa198;
    --heat-high: #d55e00;
}

h1, h2, h3 { letter-spacing: 0; }

main a:not(.primary-link):not(.nav-link):not(.app-brand) {
    color: var(--accent);
    font-weight: 750;
    text-decoration: none;
}
main a:not(.primary-link):not(.nav-link):not(.app-brand):hover { text-decoration: underline; }

.page-h1 {
    margin: 4px 0 10px;
    color: var(--text);
    font-size: 1.18rem;
    font-weight: 800;
    letter-spacing: -0.005em;
}
.primary-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 34px;
    padding: 0 11px;
    border: 1px solid color-mix(in srgb, var(--accent) 58%, var(--border));
    border-radius: 8px;
    background: var(--accent-soft);
    color: var(--text-dim);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.72rem;
    font-weight: 750;
    white-space: nowrap;
    text-decoration: none;
    box-shadow: var(--shadow);
}
.primary-link:hover {
    border-color: var(--accent);
    color: var(--accent);
    text-decoration: none;
}
.primary-link:focus-visible,
.polarization-tab:focus-visible,
input:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

main {
    display: grid;
    gap: 12px;
}

h2,
h3 {
    letter-spacing: 0;
}

p {
    margin: 0;
    color: var(--text-dim);
    font-size: 0.9rem;
    line-height: 1.56;
}

.lede {
    color: var(--text);
    font-size: 0.94rem;
}

.layout {
    display: grid;
    grid-template-columns: minmax(792px, 1.485fr) minmax(478px, 1.065fr);
    gap: 14px;
    align-items: start;
}

.section-band {
    display: grid;
    gap: 8px;
    min-width: 0;
    padding: 10px;
    border-left: 2px solid var(--section-accent);
    background: transparent;
}

.section-heading {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--section-accent);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0;
    text-transform: uppercase;
}

.section-heading > span {
    flex: 0 0 auto;
}

.section-heading::after {
    content: "";
    height: 1px;
    flex: 1;
    background: linear-gradient(90deg, var(--section-accent), transparent);
    opacity: 0.65;
}

.setup-band {
    --section-accent: var(--accent);
}

.results-band {
    --section-accent: var(--metric-r);
}

.parameters,
.results-grid {
    display: grid;
    gap: 12px;
    align-items: start;
    min-width: 0;
}

.results-grid {
    gap: 14px;
}

.panel {
    min-width: 0;
    padding: 12px;
    border: 1px solid var(--border);
    border-top: 2px solid var(--section-accent, var(--border));
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
}

.panel-title {
    margin: 0 0 9px;
    color: var(--accent);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0;
    text-transform: uppercase;
}

.formula-section {
    display: grid;
    gap: 12px;
}

.design-copy {
    max-width: 980px;
}

.equation-panel {
    display: grid;
    gap: 10px;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface2);
}

.equation-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 12px;
    align-items: start;
}

.equation {
    min-width: 0;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 2px;
    color: var(--text);
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    font-size: 0.84rem;
    line-height: 1.45;
    overflow-wrap: normal;
}

.equation mjx-container[display="true"] {
    margin: 0;
}

.equation-row p {
    min-width: 0;
    font-size: 0.78rem;
    line-height: 1.45;
}

.ctrl-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
}

.control-group {
    display: grid;
    gap: 5px;
    min-width: 0;
}

label {
    display: block;
    margin-bottom: 2px;
    color: var(--text-dim);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0;
}

input[type="number"],
input[type="text"],
select {
    width: 100%;
    padding: 5px 8px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface2);
    color: var(--text);
    font: inherit;
    font-size: 0.8rem;
    outline: none;
    transition: border-color 0.16s ease, background 0.16s ease;
}

input[type="number"] {
    appearance: textfield;
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    margin: 0;
    -webkit-appearance: none;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--accent);
}

input:focus-visible,
select:focus-visible,
.polarization-tab:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.dual-input {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 92px;
    gap: 8px;
    align-items: center;
}

.metric-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-top: 10px;
}

.metric-row {
    display: grid;
    gap: 4px;
    min-width: 0;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface2);
    color: var(--text-dim);
    font-size: 0.76rem;
    line-height: 1.3;
}

.metric-value {
    color: var(--text);
    font-size: 0.82rem;
    font-weight: 850;
    white-space: nowrap;
}

.stack-strip {
    display: flex;
    width: 100%;
    min-width: 0;
    height: 26px;
    margin-bottom: 9px;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface2);
}

.stack-strip-segment {
    position: relative;
    isolation: isolate;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 0;
    padding: 0 10px;
    overflow: hidden;
    border-right: 1px solid rgba(255, 255, 255, 0.06);
    color: rgba(255, 255, 255, 0.88);
    font-size: 0.6rem;
    font-weight: 700;
    letter-spacing: 0;
    white-space: nowrap;
}

.stack-strip-label {
    position: relative;
    z-index: 2;
    display: block;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.16);
}

.stack-table {
    --stack-row-min-width: 0px;
    --stack-row-grid: 26px minmax(108px, 0.9fr) minmax(136px, 1.06fr) minmax(50px, 0.48fr) minmax(50px, 0.48fr) minmax(84px, 0.72fr) minmax(70px, 0.58fr) minmax(64px, 0.54fr) 28px 28px 28px;
    --stack-control-height: 28px;
    overflow-x: auto;
    padding-bottom: 2px;
}

.stack-table.is-bragg {
    --tutorial-pair-width: 52px;
}

.stack-hdr,
.stack-row {
    display: grid;
    min-width: var(--stack-row-min-width);
    grid-template-columns: var(--stack-row-grid);
    gap: 4px;
    align-items: center;
}

.stack-hdr.is-bragg {
    min-width: calc(var(--stack-row-min-width) + var(--tutorial-pair-width) + 4px);
    grid-template-columns: var(--tutorial-pair-width) var(--stack-row-grid);
}

.tutorial-bragg-row,
.tutorial-pair-group {
    display: grid;
    min-width: calc(var(--stack-row-min-width) + var(--tutorial-pair-width) + 4px);
    grid-template-columns: var(--tutorial-pair-width) minmax(var(--stack-row-min-width), 1fr);
    gap: 4px;
    align-items: stretch;
}

.tutorial-bragg-row > .stack-row,
.tutorial-pair-rows,
.tutorial-pair-rows > .stack-row {
    min-width: var(--stack-row-min-width);
}

.tutorial-pair-placeholder {
    display: block;
}

.tutorial-pair-repeat-cell {
    display: flex;
    align-items: stretch;
    padding: 2px 0;
    border: 1px solid var(--border);
    background: var(--surface2);
}

.tutorial-pair-repeat-cell input {
    width: 100%;
    min-width: 0;
    padding: 0 4px;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: var(--text);
    font-family: var(--font-data);
    font-size: 0.74rem;
    font-weight: 500;
    text-align: center;
}

.tutorial-pair-rows .stack-row:first-child {
    border-bottom-color: transparent;
}

.tutorial-pair-group:hover .stack-row,
.tutorial-pair-group:focus-within .stack-row {
    background: color-mix(in srgb, var(--accent) 7%, transparent);
    box-shadow: inset 2px 0 0 var(--accent);
}

.stack-hdr > *,
.stack-row > * {
    min-width: 0;
}

.stack-hdr {
    position: relative;
    margin-bottom: 2px;
    padding: 5px 2px;
    border: 1px solid var(--border);
    border-radius: 0;
    background: var(--surface2);
    color: var(--text-soft);
    font-size: 0.62rem;
    font-weight: 500;
    letter-spacing: 0.035em;
    text-transform: none;
}

.stack-hdr > span,
.stack-hdr > label {
    min-height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.stack-hdr .symbol-label,
.stack-hdr .table-toggle {
    justify-content: center;
    text-transform: none;
}

.stack-hdr .tutorial-pairs-head {
    justify-content: center;
}

.stack-row {
    margin-bottom: 0;
    padding: 2px 0;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
    transition: background-color 0.1s ease, box-shadow 0.1s ease;
}

.stack-row:hover,
.stack-row:focus-within {
    background: color-mix(in srgb, var(--accent) 7%, transparent);
    box-shadow: inset 2px 0 0 var(--accent);
}

.stack-row > .layer-badge {
    transform: translateX(5px);
}

.layer-badge {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border-radius: 2px;
    font-size: 0.62rem;
    font-family: var(--font-data);
    font-weight: 500;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.14);
}

.layer-name,
.layer-static,
.material-static {
    height: var(--stack-control-height);
    min-height: var(--stack-control-height);
    display: flex;
    align-items: center;
    border-radius: 6px;
}

.layer-name.fixed,
.layer-static,
.material-static {
    padding: 0 9px;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text-dim);
    font-size: 0.76rem;
    font-weight: 600;
}

.layer-static,
.material-static {
    justify-content: center;
    font-size: 0.74rem;
    letter-spacing: 0;
}

.layer-name-field {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 5px;
}

.layer-name-field input,
.stack-row input[type="number"],
.stack-row input[type="text"],
.material-source-select,
.coherence-switch,
.coherence-static,
.row-nk-toggle {
    height: var(--stack-control-height);
    min-height: var(--stack-control-height);
}

.stack-row input {
    padding: 4px 7px;
    font-size: 0.76rem;
}

.material-cell {
    min-width: 0;
    display: flex;
    align-items: center;
}

.material-source-select {
    width: 100%;
    min-width: 0;
    padding: 4px 7px;
    background: var(--surface2);
    color: var(--text-dim);
    font-size: 0.72rem;
    font-weight: 700;
}

.material-source-select.has-material {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 750;
}

.coherence-switch,
.coherence-static {
    width: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    font-size: 0.64rem;
    font-weight: 800;
    letter-spacing: 0;
    text-transform: lowercase;
    white-space: nowrap;
}

.coherence-switch {
    position: relative;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--accent);
}

.coherence-switch input {
    position: absolute;
    inset: 0;
    margin: 0;
    opacity: 0;
}

.coherence-static {
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text-soft);
}

/* Keep the tutorial stack component in lockstep with the calculator's
 * final Metrology layer. The tutorial-specific rules above provide the
 * structure; these are the shared presentation overrides. */
.stack-strip {
    height: 22px;
    border-radius: 0;
}

.stack-row input[type="number"],
.stack-row input[type="text"],
.material-source-select,
.layer-name,
.layer-static,
.material-static,
.coherence-switch,
.coherence-static {
    border-radius: var(--radius-control);
    font-weight: 400;
}

.stack-row input[type="number"],
.coherence-switch,
.coherence-static {
    font-family: var(--font-data);
    font-variant-numeric: tabular-nums lining-nums;
}

.table-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    margin: 0;
    color: var(--text-dim);
    font-size: 0.64rem;
    font-weight: 800;
    letter-spacing: 0;
    white-space: nowrap;
}

.table-toggle input {
    width: 15px;
    height: 15px;
    margin: 0;
    accent-color: var(--accent);
}

.stack-actions {
    display: flex;
    gap: 8px;
    margin-top: 9px;
}

.stack-actions .primary-link {
    flex: 1;
}

.result-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.result-heading {
    min-width: 0;
    display: grid;
    gap: 4px;
}

.result-head .panel-title {
    margin-bottom: 0;
}

.selected-angle-label {
    color: var(--text-dim);
    font-size: 0.82rem;
    font-weight: 700;
}

.legend-row {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 10px;
    color: var(--text-dim);
    font-size: 0.78rem;
}

.legend-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.legend-line {
    width: 22px;
    height: 4px;
    border-radius: 999px;
}
.legend-line.is-dashed {
    height: 0;
    background: transparent !important;
    border-top: 3px dashed var(--metric-bare);
    border-radius: 0;
}

.hover-readout {
    min-height: 42px;
    margin-top: 10px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    color: var(--text-dim);
    font-size: 0.82rem;
}

.hover-readout .hover-empty {
    color: var(--text-soft);
}

.hover-readout .hover-wavelength,
.hover-readout .hover-value {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 28px;
    padding: 5px 9px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface2);
    font-weight: 700;
}

.hover-readout .hover-wavelength {
    color: var(--text);
}

.hover-swatch {
    width: 10px;
    height: 10px;
    border-radius: 3px;
}

.summary-note {
    margin-top: 8px;
    color: var(--text-soft);
    font-size: 0.74rem;
    line-height: 1.45;
}

.color-results {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.color-swatch-card {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 12px;
    align-items: center;
    min-width: 0;
}

.color-swatch {
    min-height: 54px;
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.color-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    color: var(--text-dim);
    font-size: 0.76rem;
    font-weight: 800;
}

.color-label span:first-child {
    min-width: 0;
}

footer {
    padding: 18px 2px 4px;
    color: var(--text-soft);
    font-size: 0.76rem;
    line-height: 1.5;
}

/* Tutorials hub */
.hub-intro {
    max-width: 880px;
    margin-bottom: 6px;
}
.hub-group {
    display: grid;
    gap: 12px;
}
.hub-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 12px;
}
.hub-card {
    display: grid;
    gap: 6px;
    align-content: start;
    padding: 14px;
    border: 1px solid var(--border);
    border-top: 2px solid var(--section-accent, var(--accent));
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
    text-decoration: none;
    transition: border-color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}
.hub-card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 30%, transparent), var(--shadow);
    text-decoration: none;
    transform: translateY(-1px);
}
.hub-card-title {
    color: var(--text);
    font-size: 0.92rem;
    font-weight: 800;
}
.hub-card-desc {
    color: var(--text-dim);
    font-size: 0.8rem;
    line-height: 1.5;
}
.hub-card-tag {
    justify-self: start;
    margin-top: 2px;
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.64rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

@media (max-width: 1320px) {
    .layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 960px) {
    body {
        padding: 8px;
    }

    header {
        align-items: flex-start;
        flex-direction: column;
    }

    .section-band {
        padding: 8px 0;
    }

    .panel {
        padding: 10px;
    }

    .ctrl-grid,
    .metric-list {
        grid-template-columns: minmax(0, 1fr);
    }

    .equation-row {
        grid-template-columns: minmax(0, 1fr);
    }

    .stack-table {
        --stack-row-min-width: 788px;
        --stack-row-grid: 24px minmax(104px, 1fr) 140px 56px 56px 96px 74px 78px 28px 28px 28px;
    }
}

@media (max-width: 620px) {
    .dual-input,
    .color-swatch-card {
        grid-template-columns: minmax(0, 1fr);
    }

    .result-head {
        align-items: flex-start;
        flex-direction: column;
    }
}