/* =================================================================== * 21 — Distance Protection Lab · streamlined layout + parity refresh Layers: tokens · reset · base · layout · widgets · phasor · components * =================================================================== */ /* ------------------------------ TOKENS ------------------------------ */
@layer tokens {
    :root {
        /* palette (kept) */
        --Aphase: hsl(0 100% 50%);
        --Bphase: hsl(43 100% 50%);
        --Cphase: hsl(240 100% 50%);
        --negative: hsl(300 100% 50%);
        --positive: hsl(120 100% 50%);
        --zero: hsl(0 0% 50%);
        --ink: #322c2d;
        --bg: transparent;
        --frame: steelblue; /* rhythm & type */
        --thick-abc: 5px;
        --radius: 0.375rem;
        --space-1: 0.25rem;
        --space-2: 0.5rem;
        --space-3: 0.75rem;
        --space-4: 1rem;
        --gap: clamp(0.45rem, 2cqi, 0.75rem);
        --font-base: clamp(0.85rem, 1cqi + 0.75rem, 1rem);
        --font-sm: clamp(0.8rem, 0.8cqi + 0.65rem, 0.95rem);
        --ch-input: 10ch;
        --border: 1px solid color-mix(in oklab, currentColor 25%, transparent);
        --ui-border: darkgrey;
        --plot-stroke: #000;
    }
    :root[data-density="dense"] {
        --space-1: 0.125rem;
        --space-2: 0.25rem;
        --space-3: 0.375rem;
        --space-4: 0.6rem;
        --thick-abc: 4px;
    }
    :root[data-theme="dark"] {
        --ink: #f5f7fb;
        --bg: #0d1117;
        --frame: #1f6feb;
        --plot-stroke: #fff;
    }
} /* ------------------------------ RESET ------------------------------ */
@layer reset {
    *,
    *::before,
    *::after {
        box-sizing: border-box;
    }
    html,
    body {
        height: 100%;
    }
    body {
        margin: 0;
    }
    img {
        max-inline-size: 40px;
        aspect-ratio: 1;
        object-fit: cover;
        border-radius: 100vw;
    }
    table {
        border-collapse: collapse;
        border-spacing: 0;
    }
} /* ------------------------------ BASE ------------------------------- */
@layer base {
    body {
        font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
        color: var(--ink);
        background: var(--bg);
        color-scheme: light dark;
        font-size: var(--font-base);
    }
    a {
        color: inherit;
        text-decoration: none;
    }
    .btn {
        cursor: pointer;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.4em;
        border: 1px solid currentColor;
        border-radius: var(--radius);
        padding: 0.35em 0.7em;
        background: none;
        transition: background 0.2s, color 0.2s;
    }
    .btn:hover {
        background: color-mix(in oklab, currentColor 10%, transparent);
    }
    .btn:focus-visible {
        outline: 2px solid var(--Aphase);
        outline-offset: 2px;
    }
    .visually-hidden {
        position: absolute !important;
        inline-size: 1px !important;
        block-size: 1px !important;
        margin: -1px;
        border: 0;
        clip: rect(0 0 0 0);
        overflow: hidden;
        white-space: nowrap;
    } /* numeric readouts */
    .num-container {
        font-variant-numeric: tabular-nums;
        min-inline-size: 10ch;
        text-align: end;
    } /* SVG default frame; D3 still sets px size */
    svg {
        display: block;
        block-size: auto;
        border: 1px solid var(--frame);
        border-radius: 0.5rem;
        box-shadow: 0 2px 8px rgba(205, 15, 15, 0.15);
    } /* ========================= Round, glowing checkboxes Visible unchecked state + neutral halo ========================= */
    input[type="checkbox"] {
        /* design tokens */
        --cb-size: 23px;
        --cb-tick: 60%; /* SVG checkmark scale inside the disc */
        --cb-active: #16a34a; /* glow color when checked (green) */
        --cb-glow: rgba(22, 163, 74, 0.7); /* checked glow intensity */
        --cb-halo: rgba(0, 0, 0, 0.08); /* subtle halo when UNchecked (light) */
        --cb-focus: #3b82f6; /* focus ring */ /* light theme base */
        --cb-bg: #f9fafb; /* circle fill when UNchecked (visible) */
        --cb-border: #d1d5db; /* border color */
        appearance: none;
        -webkit-appearance: none;
        color-scheme: light dark;
        width: var(--cb-size);
        height: var(--cb-size);
        border: 2px solid var(--cb-border);
        border-radius: 50%;
        background: var(--cb-bg);
        cursor: pointer;
        display: grid;
        place-content: center;
        position: relative;
        transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
        box-shadow: 0 0 0 0 transparent; /* baseline to smooth halo swap */
    } /* ---------- UNCHECKED neutral halo (soft) ---------- */
    input[type="checkbox"]::after {
        content: "";
        position: absolute;
        inset: -2px; /* tiny bleed for a nicer glow */
        border-radius: 50%;
        box-shadow: 0 0 8px var(--cb-halo);
        opacity: 0.9;
        transition: opacity 0.2s ease;
        pointer-events: none;
        z-index: 0;
    } /* ---------- CHECKED glowing disc + tick ---------- */
    input[type="checkbox"]::before {
        content: "";
        width: 20px;
        height: 20px;
        background-color: var(--cb-active);
        border-radius: 50%;
        box-shadow: 0 0 8px var(--cb-glow); /* Material checkmark (inline SVG) */
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='white' d='M9 16.17 4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E");
        background-repeat: no-repeat;
        background-size: var(--cb-tick) var(--cb-tick);
        background-position: center; /* start hidden until :checked */
        transform: rotate(1turn) scale(0);
        opacity: 0;
        transition: transform 0.2s ease, opacity 0.2s ease;
        will-change: transform, opacity;
        z-index: 1;
    } /* reveal + animate when checked */
    input[type="checkbox"]:checked::before {
        transform: rotate(0turn) scale(1);
        opacity: 1;
    } /* when checked, fade out the neutral halo */
    input[type="checkbox"]:checked::after {
        opacity: 0;
    } /* subtle border accent when checked */
    input[type="checkbox"]:checked {
        border-color: var(--cb-active);
    } /* accessibility: keyboard focus */
    input[type="checkbox"]:focus-visible {
        outline: 2px solid var(--cb-focus);
        outline-offset: 2px;
    } /* disabled */
    input[type="checkbox"]:disabled {
        opacity: 0.55;
        cursor: not-allowed;
    } /* ---------- THEME OVERRIDES ---------- Use either [data-theme="dark"] on <html> or <body>, or rely on the prefers-color-scheme fallback. -------------------------------------- */ /* Attribute-driven dark theme (recommended for app toggles) */
    :where(html, body)[data-theme="dark"] input[type="checkbox"] {
        --cb-bg: #1f2937; /* visible circle in dark mode */
        --cb-border: #4b5563;
        --cb-halo: rgba(255, 255, 255, 0.06); /* soft, neutral halo for dark */
    } /* System dark mode fallback when no explicit data-theme is set */
    @media (prefers-color-scheme: dark) {
        :where(html):not([data-theme]) input[type="checkbox"],
        :where(body):not([data-theme]) input[type="checkbox"] {
            --cb-bg: #1f2937;
            --cb-border: #4b5563;
            --cb-halo: rgba(255, 255, 255, 0.06);
        }
    } /* Reduced motion consideration (optional but nice) */
    @media (prefers-reduced-motion: reduce) {
        input[type="checkbox"]::before {
            transition: opacity 0.2s ease;
            transform: none;
        }
    }
} /* ------------------------------ LAYOUT ----------------------------- */
@layer layout {
    /* Keep the outer layout as FLEX (not grid) and make sizes explicit */
    .layout-3col {
        display: flex;
        align-items: flex-start;
        gap: var(--gap);
        padding: var(--gap);
        flex-wrap: nowrap;
        min-width: 0;        
    } /* Panels: light card look + container queries + perf */
    .panel {
        background: color-mix(in oklab, white 70%, transparent);
        border: 1px solid color-mix(in oklab, currentColor 10%, transparent);
        border-radius: 0.75rem;
        padding: 0.5rem 1rem;
        content-visibility: auto; /* render only when visible */
        contain-intrinsic-size: 800px; /* prevents layout jump */
    }
    #matrixEnable-toggle {
        position: absolute;
        inset-block-start: 0; /* logical top */
        inset-inline-end: 0; /* logical right */ /* optional padding from the edge */
        translate: 0 0; /* avoid inherited transforms issues */
    } /* Make side columns sticky with their own scroll */
    #Right_Table {
        display: flex;
        flex-direction: column;
        gap: 1rem;
        width: auto;
        background: color-mix(in oklab, white 70%, transparent);
        border: 1px solid color-mix(in oklab, currentColor 10%, transparent);
        border-radius: 0.75rem;
        padding: 0.5rem 1rem;
        min-width: 0;
    }
    #Right_Table {
        width: auto;
        flex: 0 0 clamp(360px, 30vw, 520px);
        min-width: 0;
    }    
    :root[data-theme="dark"] #Right_Table {
        color: white;
        border: 1px solid color-mix(in oklab, #e6edf3 12%, transparent);
        background: none;
    } /* Center lane (canvas) */
    #vis_inner_Z {
        display: flex;
        justify-items: center;
        background: color-mix(in oklab, white 60%, transparent);
        border: 1px solid color-mix(in oklab, currentColor 12%, transparent);
        flex-direction: row;
        justify-content: space-evenly;
        align-items: stretch;
        gap: 1rem;
    }
    #vis_inner_Z_svg,
    #vis_inner_V_svg,
    #vis_inner_I_svg {
        aspect-ratio: 1/1;
        margin-block: 0.25rem 0.35rem;
    }
    #vis_inner_V,
    #vis_inner_I {
        min-width: 60%;
    }
    #table_V,
    #table_I {
        min-width: 30%;
    } /* Numeric rows flanking the center SVG */
    .triple-row {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
        gap: var(--space-1);
        align-items: center;
    }
    .triple-row > div[id$="_gap"] {
        inline-size: var(--space-2);
    }
    .triple-row .num-container {
        min-width: 0;
        display: flex;
        justify-content: flex-end;
    }
    .triple-row .num-container table,
    .triple-row .num-container td {
        white-space: nowrap;
    }
    .triple-row .num-container table {
        width: max-content;
    }
    .triple-row .num-container td[id^="angz"] {
        text-decoration: underline;
        text-decoration-thickness: 0.12em;
        text-underline-offset: 0.12em;
        text-decoration-skip-ink: none;
    } /* Responsive collapse: to 2 columns then 1 */
    @media (max-width: 1200px) {
        .layout-3col {
            grid-template-columns: minmax(300px, 360px) 1fr;
            grid-template-areas: "left center" "right center";
        }
        .layout-3col { flex-wrap: wrap; }
        #Right_Table.panel {
            position: static;
            max-block-size: none;
            overflow: visible;
        }
    }
    @media (max-width: 880px) {
        .layout-3col {
            grid-template-columns: 1fr;
            grid-template-areas: "left" "center" "right";
        }
        .layout-3col { flex-direction: column; }
    } /* App bar (kept) */
    .app-bar {
        position: sticky;
        inset-block-start: 0;
        z-index: 20;
        display: grid;
        grid-template-columns: 1fr 1fr 1fr 1fr;
        align-items: center;
        gap: 1rem;
        padding: 0 1.5rem;
        background: color-mix(in oklab, white 85%, transparent);
        backdrop-filter: blur(6px);
        border-block-end: 1px solid color-mix(in oklab, currentColor 15%, transparent);
    }
    .app-title {
        margin: 0;
        font-size: clamp(1rem, 1.6cqi + 0.8rem, 1.25rem);
    }
    .app-toggles {
        display: flex;
        gap: 0.5rem;
        align-items: center;
        flex-wrap: wrap;
    }
    .chip {
        display: inline-flex;
        gap: 0.5em;
        align-items: center;
    }
    .chip input {
        accent-color: var(--frame);
    }
    hr {
        width: 100%;
        border: none;
        border-top: 1px solid color-mix(in oklab, currentColor 25%, transparent);
        height: 0;
        margin: 0;
    }
    legend {
        font-size: 1rem;
        font-weight: 900;
    }
    .lbl {
        font-size: 0.75rem;
    }
    #collapse0,
    #collapseZ0 {
        font-size: 1.05rem;
        font-weight: 900;
    }
    .phasor-inputs {
        display: flex;
        flex-direction: row;
        gap: 0.7rem;
    }
    #settings-negativeSeq {
        border-right: 1px solid #cccccc7a !important;
        height: auto;
        padding-right: 0.6rem !important;
    }
} /* ------------------------------ WIDGETS ----------------------------- */
@layer widgets {
    fieldset {
        border: 0;
        padding: 0;
        margin: 0;
    }
    .control-block {
        display: grid;
        gap: var(--space-2);
    }
    .hstack {
        display: flex;
        flex-direction: row;
        justify-content: center;
        gap: var(--space-4);
        align-items: center;
    } /* generic field */
    .field {
        display: flex;
        flex-direction: column;
        gap: 0.3rem;
    }
    .field > label {
        margin-block-end: 0.125em;
        color: #444;
        font-size: 0.75rem;
    }
    .field :where(input:not([type="checkbox"]):not([type="radio"]), select){
      inline-size:100%;
      padding:.25em .375em;
      border:var(--border);
      border-radius:.25rem;
      font-size:.75rem;
    }
    .fieldZ {
        display: flex;
        flex-direction: row;
        gap: 1rem;
    } /* numbers */
    input[type="number"] {
        inline-size: var(--ch-input);
        padding: 0.25rem 0.4rem;
        border: var(--border);
        border-radius: 0.35rem;
        font-variant-numeric: tabular-nums;
        text-align: right;
    }
    input[type="number"]:focus-visible {
        outline: 2px solid #1f6feb;
        outline-offset: 2px;
    } /* reach form */
    #reach {
        display: grid;
        gap: 0.25rem;
    }
    .reach-row {
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 0.3rem;
        font-size: var(--font-sm);
    }
    .reach-row input {
        max-inline-size: 3.5rem;
        padding: 0.1rem 0.25rem;
        border: var(--border);
        border-radius: 0.25rem;
    }
    .reach-row .label {
        white-space: nowrap;
    }
    .reach-row .unit {
        text-align: center;
        min-inline-size: 1.25rem;
    }
    .reach-row .calc {
        min-inline-size: 3ch;
        text-align: end;
    }
    @container panel (max-width:720px) {
        .reach-row {
            grid-template-columns: repeat(2, auto);
        }
    } /* preset bar */
    .preset-bar {
        display: flex;
        flex-direction: column;
        align-items: start;
        gap: 0.3em;
    }
    .preset-bar select {
        inline-size: clamp(6em, 20cqi, 12em);
    }
    #preset-save,
    #preset-delete {
        font-size: 0.9em;
        padding: 0.2em 0.5em;
    }
    #preset-select {
        color: black;
        background-color: white;
    } /* unit chip */
    #spanUnit {
        padding: 0.25rem 0.5rem;
        border: 1px solid color-mix(in oklab, currentColor 20%, transparent);
        border-radius: 0.375rem;
        font-variant-numeric: tabular-nums;
        user-select: none;
        cursor: pointer;
        transition: transform 0.12s ease, opacity 0.12s ease;
    }
    #spanUnit:active {
        transform: scale(0.97);
    } /* lock toggles (kept) */
    #toggleon,
    #toggleon_I {
        inline-size: 10px;
        block-size: 13px;
        border: 1px solid #000;
        background: #010642;
        text-align: start;
    } /* SEL add-on / enable matrix */
    #enable-matrix {
        opacity: 0;
        max-height: 0;
        overflow: hidden;
        transition: opacity 0.3s ease, max-height 0.3s ease;
    }
    #sel-enable-table {
        display: flex;
        flex-direction: column;
        gap: 0.75rem;
    }
    #sel-enable-table .panel-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
    }
    #sel-enable-table .panel-title {
        font-size: 1rem;
        font-weight: 600;
        margin: 0;
    }
    .sel-enable-container {
        padding: 0.5rem;
        border-radius: 0.75rem;
        border: 1px solid color-mix(in oklab, currentColor 12%, transparent);
        background: color-mix(in oklab, white 85%, transparent);
    }
    :root[data-theme="dark"] .sel-enable-container {
        background: #0d1117;
        color: var(--ink);
        border-color: #30363d;
    }
    #enable-matrix.visible {
        opacity: 1;
        max-height: 760px;
    }
    #enable-matrix :is(th, td) {
        border: 1px solid #ccc;
        padding: 0;
        text-align: center;
        font-size: 0.825em;
    } /* foreignObject tables inside vis */
    #svgSELTable table {
        background: #fff;
    }
    #svgSELTable table tr:not(:last-child) > td:nth-child(2) {
        font-size: 0.5em;
        inline-size: 50px;
    } /* key/value tables */
    .kv-table {
        width: 45%;
    }
    .kv-table thead td {
        font-size: 0.5rem;
        opacity: 0.85;
        text-align: center;
    }
    .kv-table td {
        padding: 0.15rem 0.25rem;
        vertical-align: middle;
    }
    .kv-table td:first-child {
        font-size: 0.65rem;
        width: 2ch;
        text-align: right;
        font-weight: 600;
    }
    .kv-table td:nth-child(2) {
        font-size: 0.65rem;
        width: 1ch;
        text-align: center;
        opacity: 0.7;
    }
    .kv-table td:nth-child(3),
    .kv-table td:nth-child(4) {
        font-size: 0.7rem;
        width: 7.4ch;
    }
    .kv-table
        :is(#form_Amp_A input, #form_Angle_A input, #form_Amp_B input, #form_Angle_B input, #form_Amp_C input, #form_Angle_C input, #form_Amp_0 input, #form_Angle_0 input, #form_Amp_1 input, #form_Angle_1 input, #form_Amp_2
            input, #form_Angle_2 input) {
        inline-size: 6.2ch;
    } /* active/invalid rows */
    .kv-table tr:has(input:focus-visible) {
        outline: 2px solid color-mix(in oklab, #1f6feb 60%, transparent);
        outline-offset: -2px;
        background: color-mix(in oklab, #1f6feb 8%, transparent);
    }
    @supports selector(: has(*)) {
        .kv-table tr:has(input:invalid) {
            background: color-mix(in oklab, crimson 8%, transparent);
        }
        .kv-table tr:has(input:invalid) input {
            border-color: color-mix(in oklab, crimson 50%, #aaa);
        }
    } /* blinder controls */
    #blinders {
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 0.4rem 0.4rem;
        padding: 0.4rem 0.4rem;
        border-radius: 0.5rem;
        background: color-mix(in oklab, #f0f6ff 50%, transparent);
    }
    #blinders label {
        display: inline-flex;
        gap: 0.15rem;
        align-items: center;
    } /* Enable-matrix surface: theme-aware */
    #svgSELTable table {
        border: 1px solid color-mix(in oklab, currentColor 15%, transparent);
        border-radius: 0.375rem;
        border-collapse: collapse;
        background: #fff;
    }
    :root[data-theme="dark"] #svgSELTable table {
        background: #0d1117;
        color: var(--ink);
        border-color: #30363d;
    } /* Green/Red status cells */
    #enable-matrix td.bit-true {
        background: hsl(140 70% 40% / 0.75);
        color: hsl(0deg 15.71% 92.53%);
        font-weight: 700;
    }
    #enable-matrix td.bit-false {
        background: hsl(0 75% 45% / 0.75);
        color: hsl(0deg 15.71% 92.53%);
        font-weight: 700;
    }
    :root[data-theme="dark"] #enable-matrix td.bit-true {
        background: hsl(140 70% 30% / 0.75);
        color: hsl(140 90% 85%);
    }
    :root[data-theme="dark"] #enable-matrix td.bit-false {
        background: hsl(0 75% 35% / 0.75);
        color: hsl(0 95% 88%);
    } /* Subtle highlight for CHOICE row (works in both themes) */
    #enable-matrix tr:has(#bit-CHOICE) td {
        background: color-mix(in oklab, var(--frame) 10%, transparent);
        font-weight: 600;
        border-top: 2px solid color-mix(in oklab, var(--frame) 30%, transparent);
    }
    :root[data-theme="dark"] #enable-matrix tr:has(#bit-CHOICE) td {
        background: color-mix(in oklab, var(--frame) 22%, transparent);
    } /* Nice sticky head */
    #enable-matrix thead th {
        position: sticky;
        top: 0;
        background: color-mix(in oklab, currentColor 6%, transparent);
    } /* Cursor hint when visible */
    #enable-matrix {
        cursor: auto;
    }
} /* ------------------------------ PHASOR ------------------------------ */
@layer phasor {
    /* draggable heads */
    circle:is(.vectora, .vectorb, .vectorc, .vectorab, .vectorbc, .vectorca, .vectora_I, .vectorb_I, .vectorc_I, .vector_KN) {
        fill: rgb(255 255 255/0.01);
        stroke: rgb(255 255 255/0.01);
        stroke-width: 0.2px;
        cursor: grab;
    } /* distance circles + intersections */
    circle:is(.vector_Z1_Line, .vector_Z2_Line, .vector_Z3_Line) {
        fill: rgb(255 255 255/0.01);
        stroke: var(--plot-stroke);
        stroke-width: 0.2px;
    }
    circle.intersect {
        fill: rgb(0 255 0/0.1);
        stroke-width: 0.2px;
    }
    circle.intersect2 {
        fill: rgb(0 0 255/0.1);
        stroke-width: 0.2px;
    }
    circle.intersect3 {
        fill: rgb(255 0 0/0.1);
        stroke-width: 0.2px;
    } /* vectors */
    polyline {
        stroke-width: 5px;
    }
    polyline:is(.vectora, .vectorab, .vectora_I, .vectorab_I, .vectora_Z, .vectorab_Z) {
        stroke: var(--Aphase);
        stroke-width: var(--thick-abc);
        stroke-linecap: round;
    }
    polyline:is(.vectorb, .vectorbc, .vectorb_I, .vectorbc_I, .vectorb_Z, .vectorbc_Z, .vectorb_Z_prime) {
        stroke: var(--Bphase);
        stroke-width: var(--thick-abc);
        stroke-linecap: round;
    }
    polyline:is(.vectorc, .vectorca, .vectorc_I, .vectorca_I, .vectorc_Z, .vectorca_Z, .vectorc_Z_prime) {
        stroke: var(--Cphase);
        stroke-width: var(--thick-abc);
        stroke-linecap: round;
    } /* sequence */
    polyline:is(.vector2, .vector2i, .vector2_I, .vector2bis, .vector2bis_I) {
        stroke: var(--negative);
        stroke-width: 4px;
        stroke-dasharray: 3;
    }
    polyline:is(.vector1, .vector1_I, .vector1bis, .vector1bis_I) {
        stroke: var(--positive);
        stroke-width: 4px;
        stroke-dasharray: 3;
    }
    polyline:is(.vector0, .vector0_I, .vector0bis, .vector0bis_I, .vector_KN) {
        stroke: var(--zero);
        stroke-width: 4px;
        stroke-dasharray: 3;
    }
    polyline.vector_Z_Line {
        stroke: var(--frame);
        stroke-width: 2px;
    } /* markers & labels */
    #marka,
    #arrow-marka,
    #markab,
    #markai,
    #markabi,
    #markaz,
    #markabz,
    #markaz_prime {
        fill: var(--Aphase);
        cursor: pointer;
    }
    #markb,
    #markbc,
    #markbi,
    #markbci,
    #markbz,
    #markbcz,
    #markbz_prime {
        fill: var(--Bphase);
        cursor: pointer;
    }
    #markc,
    #markca,
    #markci,
    #markcai,
    #markcz,
    #markcaz,
    #markcz_prime {
        fill: var(--Cphase);
        cursor: pointer;
    }
    #mark2,
    #mark2i,
    #mark2bis,
    #mark2bisi {
        fill: var(--negative);
    }
    #mark1,
    #mark1i,
    #mark1bis,
    #mark1bisi {
        fill: var(--positive);
    }
    #mark0,
    #mark0i,
    #mark0bis,
    #mark0bisi,
    #markKN,
    #markc-arc {
        fill: var(--zero);
    }
    #markPol {
        stroke: var(--frame);
        stroke-width: 2px;
    }
    marker {
        fill: black;
    }
    .load-blinder-v,
    .load-blinder-arc {
        stroke: orange;
        stroke-width: 2px;
        fill: none;
        opacity: 0.9;
        display: none;
    }
    .quad {
        stroke: var(--plot-stroke);
    }
    text {
        text-anchor: middle;
    }
    .texta,
    .textai,
    .textaLegend,
    .textaiLegend,
    .texta_I,
    .texta_Z,
    .textab_Z {
        fill: var(--Aphase);
    }
    .textb,
    .textbi,
    .textbLegend,
    .textbiLegend,
    .textb_I,
    .textb_Z,
    .textbc_Z {
        fill: var(--Bphase);
    }
    .textc,
    .textci,
    .textcLegend,
    .textciLegend,
    .textc_I,
    .textc_Z,
    .textca_Z {
        fill: var(--Cphase);
    }
    .texta,
    .textb,
    .textc {
        font-size: 2rem;
        font-weight: 700;
    }
    .dir-fwd {
        stroke: limegreen;
        stroke-dasharray: 4 2;
    }
    .dir-rev {
        stroke: crimson;
        stroke-dasharray: 4 2;
    }
    .dir-lbl {
        font: 0.5rem system-ui, sans-serif;
        fill: #333;
    }
} /* ------------------------------ COMPONENTS -------------------------- */
@layer components {
    /* history bar */
    #historyBar {
        display: grid;
        grid-auto-flow: column;
        gap: 0.5rem;
        align-items: center;
        padding: 0.2rem 0.6rem;
        background: var(--ui-surface, #f7f9fc);
        inset-block-start: 0;
        z-index: 10;
        container-type: inline-size;
        width: 100px;
    }
    #historyBar .btn {
        inline-size: clamp(1.8rem, 5cqi, 2rem);
        block-size: 1.8rem;
        display: grid;
        place-items: center;
        border: 1px solid var(--ui-border, #c9d1d9);
        border-radius: 0.5rem;
        background: #fff;
        transition: transform 0.12s ease, background-color 0.15s ease, opacity 0.15s ease;
    }
    #historyBar .btn:where(:hover, :focus-visible) {
        transform: translateY(-1px);
    }
    #historyBar .btn:focus-visible {
        outline: 2px solid #1f6feb;
        outline-offset: 2px;
    }
    #historyBar .btn[disabled] {
        opacity: 0.7;
        cursor: not-allowed;
        pointer-events: none;
        filter: grayscale(0.8);
        color: black;
    } /* Make the cell a size container so the button can scale with cqi units */
    td.radio-sq {
        container-type: inline-size;
        padding: 0.25rem; /* tweak as needed */
        text-align: center; /* keeps the square centered in the cell */
    }
    td.radio-sq > label {
        /* sizing tokens */
        --btn-size: min(100cqi, 2.5rem); /* grows up to 3.25rem, but never wider than the cell */
        --btn-bg: color-mix(in lab, Canvas 92%, black 8%);
        --btn-fg: CanvasText;
        --btn-bd: color-mix(in lab, currentColor 28%, transparent);
        position: relative;
        display: grid;
        place-items: center;
        inline-size: var(--btn-size);
        aspect-ratio: 1; /* perfect square */
        border: 1px solid var(--btn-bd);
        border-radius: 0.5rem; /* set to 0 for hard square corners */
        background: var(--btn-bg);
        color: var(--btn-fg);
        user-select: none;
        cursor: pointer;
        font: 600 clamp(0.8rem, 2.5cqi, 1rem) / 1 system-ui, Segoe UI, Roboto, sans-serif;
        letter-spacing: 0.01em;
        transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.06s ease;
    } /* Hide the native radio but keep it accessible and focusable */
    td.radio-sq input[type="radio"] {
        position: absolute;
        inset: 0;
        inline-size: 100%;
        block-size: 100%;
        margin: 0;
        opacity: 0;
        appearance: none;
    } /* Press feedback */
    td.radio-sq > label:active {
        transform: translateY(1px);
    } /* Selected state using modern :has */
    td.radio-sq > label:has(input[type="radio"]:checked) {
        --btn-bg: color-mix(in lab, Highlight 18%, Canvas 82%);
        --btn-fg: Highlight;
        --btn-bd: Highlight;
        outline: 2px solid color-mix(in lab, Highlight 35%, transparent);
        outline-offset: 2px;
    } /* Keyboard focus ring */
    td.radio-sq > label:has(input[type="radio"]:focus-visible),
    td.radio-sq > label:focus-within {
        /* fallback if :has isn't supported */
        box-shadow: 0 0 0 0.2rem color-mix(in lab, currentColor 30%, transparent);
        outline: none;
    } /* Disabled look, if you ever need it */
    td.radio-sq > label:has(input[type="radio"]:disabled) {
        opacity: 0.5;
        cursor: not-allowed;
    } /* Fallback if you prefer toggling a class from JS or legacy CSS: */
    td.radio-sq > label.active {
        --btn-bg: color-mix(in lab, Highlight 18%, Canvas 82%);
        --btn-fg: Highlight;
        --btn-bd: Highlight;
    } /* dark parity for panels/accordion/SVG */
    :root[data-theme="dark"] .panel,
    :root[data-theme="dark"] #vis_inner_Z {
        background: color-mix(in oklab, #0d1117 60%, transparent) !important;
        border-color: color-mix(in oklab, #e6edf3 12%, transparent);
    }
    :root[data-theme="dark"] .accordion .accordion-item details > summary {
        background: color-mix(in oklab, #e6edf3 6%, transparent);
        border-color: color-mix(in oklab, #e6edf3 14%, transparent);
    }
    :root[data-theme="dark"] svg {
        border-color: color-mix(in oklab, var(--frame) 60%, transparent);
    }
    :root[data-theme="dark"] .btn {
        border: 1px solid white;
        color: white;
    }
    :root[data-theme="dark"] input:not([type="checkbox"]):not([type="radio"]) {
        color: white;
        background-color: var(--bg);
    }
    :root[data-theme="dark"] #blinders {
        background: none !important;
    }
    :root[data-theme="dark"] .app-bar {
        background: none !important;
    }
    :root[data-theme="dark"] #historyBar {
        background: none;
    }
    /* HistoryBar buttons: adopt light-on-dark in dark theme */
    :root[data-theme="dark"] #historyBar .btn {
        color: #fff;
        border: 1px solid #e6edf3;
        background: none;
    }
    :root[data-theme="dark"] #historyBar .btn[disabled] {
        color: #9ba1a6;
        border-color: #4b5563;
    }
    :root[data-theme="dark"] #preset-select {
        color: white !important;
        background-color: var(--bg) !important;
    }
    :root[data-theme="dark"] .kv-table thead td,
    :root[data-theme="dark"] .field > label {
        font-weight: 600;
        color: white !important;
    } /* Respect reduced motion */
    @media (prefers-reduced-motion: reduce) {
        .btn,
        #historyBar .btn,
        .fault-grid label,
        #spanUnit {
            transition: none;
        }
    }
} /* === HOTFIX: restore 3 columns with nested flex row =================== */ /* Left column: fixed-ish width, scrolls on overflow like your screenshot */
#Left_Table {
    width: auto;
    flex: 0 0 clamp(280px, 22vw, 360px);
    min-width: 0;
    background: color-mix(in oklab, white 70%, transparent);
    border: 1px solid color-mix(in oklab, currentColor 10%, transparent);
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
}
.fault-grid label {
    font-size: 0.75rem;
}
:root[data-theme="dark"] #Left_Table {
    color: white;
    border: 1px solid color-mix(in oklab, #e6edf3 12%, transparent);
    background: none;
}
.animationControl {
    width: auto;
    flex: 1 1 560px;
    display: flex;
    align-items: stretch;
    justify-content: flex-start;
    gap: var(--gap);
    min-width: 0;
}
.animationControl > :first-child {
    flex: 1 1 auto; /* grow to fill remaining space */
    min-inline-size: 0; /* allow shrinking without overflow */
    display: flex;
    flex-direction: column;
    gap: 1rem;
} /* Responsive: stack center + right under 1200px like you had */
@media (max-width: 1200px) {
    .animationControl {
        flex-direction: column;
    }
    #Right_Table {
        min-inline-size: unset;
    }
    .layout-3col { flex-wrap: wrap; }
    #Left_Table { flex-basis: 340px; }
    .animationControl { flex-basis: min(720px, 100%); }
    #Right_Table { flex-basis: 340px; }    
}
@media (max-width: 880px) {
    .layout-3col { flex-direction: column; }
    #Left_Table, .animationControl, #Right_Table { flex: 1 1 auto; width: 100%; }
}
@layer contact {
    .contact-actions {
        display: flex;
        align-items: center;
        gap: 1rem;
    }
    .cta-email {
        padding: 0.5rem 1rem;
        color: #000;
        border-radius: 0.5rem;
        font-weight: 600;
        text-decoration: none;
    }
    :root[data-theme="dark"] .cta-email {
        color: #fff;
    }
    .social-links {
        display: flex;
        gap: 0.75rem;
    }
    .social-links a {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 2.25rem;
        height: 2.25rem;
        border-radius: 50%;
        background: #222;
        color: #fff;
        transition: background 0.2s;
    }
    .social-links a:hover {
        background: #444;
    }
    .social-links svg {
        fill: currentColor;
    }
}
input[type="checkbox"] {
    background-color: var(--cb-bg);
}
/* When density toggle is UNCHECKED (comfortable), force larger SVG labels
   Apply to all SVGs except the KN view to preserve its sizing. */
:root[data-density="comfortable"] svg:not(#vis_KN_svg) text {
  font-size: 26px !important;
}
/* Increase numeric table-cell text size in comfortable density */
:root[data-density="comfortable"] .num-container,
:root[data-density="comfortable"] .num-container td {
  font-size: 16px !important;
}
/* ------------------ GROUND CHAR (container-driven) ------------------ */
@layer components {
    /*
     Ground Char layout for #collapseSEL_GroundChar
     - Uses CSS Container Queries on the component container instead of page media queries
     - Minimizes specificity using :where() so rules are easy to override

     Usage:
       1) The parent container is the element with id="collapseSEL_GroundChar".
          It is declared as a size container so child layout can respond with @container.
       2) Inside, the section#SEL-ground-char has class="ground-char" to apply the base flex column.
       3) Row groups use class="row-fields".
       4) The bottom strip uses class="gc-strip" with sub-blocks: .gc-flags, .gc-order, .gc-presets.

     Notes:
       - :where(#collapseSEL_GroundChar) contributes zero specificity; selectors stay lightweight.
       - Container name is "ground"; queries use @container ground (...)
       - No global media queries are used for this module.
    */
    :where(#collapseSEL_GroundChar) {
        container-type: inline-size;
        container-name: ground;
    }

    :where(#collapseSEL_GroundChar) .ground-char {
        display: flex;
        flex-direction: column;
        gap: var(--space-3);
    }

    :where(#collapseSEL_GroundChar) .phasor-inputs {
        display: flex;
        flex-direction: row;
        gap: 0.7rem;
        align-items: flex-start;
    }

    :where(#collapseSEL_GroundChar) .row-fields {
        display: inline-flex;
        gap: 0.5rem;
        align-items: flex-end;
    }

    :where(#collapseSEL_GroundChar) .field-scalar-mode {
        width: 100%;
    }
    :where(#collapseSEL_GroundChar) .field.field-wide {
        flex: 1 1 100%;
        max-width: none;
    }
    :where(#collapseSEL_GroundChar) .chip-group {
        display: inline-flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        align-items: center;
    }
    :where(#collapseSEL_GroundChar) .chip-group .chip {
        font-size: 0.75rem;
    }
    #scalar-mode-note {
        margin-top: 0.35rem;
        font-size: 0.7rem;
    }
    #ELOP {
        min-width: 3.5rem;
    }
    :where(#collapseSEL_GroundChar) .is-disabled {
        opacity: 0.6;
    }

    :where(#collapseSEL_GroundChar) .gc-strip {
        display: flex;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: var(--space-4);
    }

    /* Right-hand separators for wide layouts */
    :where(#collapseSEL_GroundChar) #settings-negativeSeq {
        height: auto;
        padding-right: 0.6rem !important;
    }
    :where(#collapseSEL_GroundChar) .gc-flags {
        display: flex;
        flex-direction: column;
        justify-content: center;
        gap: 0.5rem;
        border-right: 1px solid #cccccc !important;
        height: auto;
        padding-right: 0.6rem !important;
    }
    :where(#collapseSEL_GroundChar) .gc-order {
        border-right: 1px solid #cccccc !important;
        height: auto;
        padding-right: 0.6rem !important;
    }
    :where(#collapseSEL_GroundChar) .gc-presets {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.35rem;
    }
    :where(#collapseSEL_GroundChar) .preset-actions {
        display: flex;
        flex-direction: row;
        gap: 0.75rem;
        flex-wrap: wrap;
    }

    /* Container-responsive rules: stack at narrow widths */
    @container ground (max-width: 820px) {
        :where(#collapseSEL_GroundChar) .phasor-inputs {
            flex-direction: column;
            gap: var(--space-3);
        }
        :where(#collapseSEL_GroundChar) #settings {
            border-bottom: 1px solid #cccccc7a !important;
        }
        :where(#collapseSEL_GroundChar) #settings-negativeSeq {
            border-right: 0 !important;
            padding-right: 0 !important;
            border-right: 1px solid #cccccc7a !important;
            padding-bottom: 0.6rem !important;
        }
        /* Keep strip horizontal even at narrow widths */
        :where(#collapseSEL_GroundChar) .gc-strip {
            flex-direction: row;
            align-items: center;
            gap: var(--space-3);
            flex-wrap: nowrap;
        }
        :where(#collapseSEL_GroundChar) .preset-actions {
            gap: var(--space-3);
        }
    }
}

/* ===================== SVG Phase Inspector Panel ===================== */
.svg-phase-panel {
  position: fixed;
  z-index: 2000;
  inset: auto auto 0 0;
  min-width: 260px;
  max-width: 380px;
  max-height: 65vh;
  overflow: auto;
  padding: 0.6rem 0.8rem;
  border: 1px solid color-mix(in oklab, currentColor 16%, transparent);
  border-radius: 0.6rem;
  background: color-mix(in oklab, white 92%, transparent);
  box-shadow: 0 6px 24px rgba(0,0,0,.18), 0 1px 0 rgba(0,0,0,.04) inset;
  color: var(--ink);
  display: none;
}
.svg-phase-panel[data-show="true"] { display: block; }

.svg-phase-panel__hd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  font-weight: 800;
  margin-bottom: .25rem;
  font-size: .95rem;
  cursor: grab;
  user-select: none;
}
.svg-phase-panel.is-dragging .svg-phase-panel__hd {
  cursor: grabbing;
}

.svg-phase-panel .btn-close {
  appearance: none;
  border: 0;
  background: red;
  color: inherit;
  font: 700 1.1rem/1 system-ui, sans-serif;
  cursor: pointer;
  padding: .1rem .3rem;
  border-radius: .35rem;
}
.svg-phase-panel .btn-close:hover {
  background: color-mix(in oklab, currentColor 10%, transparent);
}

.svg-phase-panel .sec {
  margin: .45rem 0 .2rem;
  padding-top: .4rem;
  border-top: 1px solid color-mix(in oklab, currentColor 12%, transparent);
}
.svg-phase-panel .sec h4 {
  margin: 0 0 .25rem 0;
  font: 700 .85rem/1.2 system-ui, sans-serif;
  opacity: .9;
}

.svg-phase-panel table {
  width: 100%;
  border-collapse: collapse;
  font-size: .82rem;
}
.svg-phase-panel td {
  padding: .1rem .2rem;
  vertical-align: middle;
}
.svg-phase-panel td:first-child {
  white-space: nowrap;
  width: 40%;
  opacity: .9;
  font-weight: 600;
}
.svg-phase-panel td.eq {
  width: .5rem;
  text-align: center;
  opacity: .7;
}
.svg-phase-panel td.aln { text-align: right; font-variant-numeric: tabular-nums; }
.svg-phase-panel td.u   { width: 2.5rem; text-align: left; opacity: .85; }
.svg-phase-panel .muted { opacity: .7; font-size: .75em; margin: .25rem 0 0; }

/* Dark theme parity */
:root[data-theme="dark"] .svg-phase-panel {
  background: color-mix(in oklab, #0d1117 94%, transparent);
  border-color: color-mix(in oklab, #e6edf3 14%, transparent);
  box-shadow: 0 6px 24px rgba(0,0,0,.4), 0 1px 0 rgba(255,255,255,.04) inset;
  color: var(--ink);
}
/* Metering base controls */
.panel-title {
    font-size: 1.05rem;
    font-weight: 900;
}
.meter-base {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding: 0.75rem;
}
.meter-base .meter-base-body {
  display: grid;
  gap: 0.75rem;
}
@media (min-width: 720px) {
  .meter-base .meter-base-body {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}
.meter-base .meter-group {
  display: grid;
  gap: 0.5rem;
  padding: 0.75rem;
  border: 1px solid var(--panel-border, rgba(0, 0, 0, 0.12));
  border-radius: 0.5rem;
  background: var(--panel-surface, rgba(255, 255, 255, 0.04));
}
.meter-base .meter-group legend {
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.meter-base .field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
/* .meter-base .field input,
.meter-base .field select {
  font: inherit;
  padding: 0.35rem 0.45rem;
  border-radius: 0.4rem;
  border: 1px solid var(--panel-border, rgba(0, 0, 0, 0.18));
  background: var(--panel-input, rgba(255, 255, 255, 0.9));
}
.meter-base .field input:focus,
.meter-base .field select:focus {
  outline: none;
  border-color: var(--accent, #2563eb);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.18);
} */
.meter-base .meter-nominal {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 1rem;
}
.meter-base .meter-nominal .lbl {
  margin-right: 0.5rem;
}
.meter-base .meter-nominal .chip {
  margin: 0;
}
.meter-base .meter-readout output {
  font-weight: 600;
}
.meter-base .meter-base-footer {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.meter-base .meter-base-toggle {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.meter-base .meter-base-toggle .chip {
  margin: 0;
}
.meter-base .meter-base-summary {
  font-size: 0.85rem;
  color: var(--muted, #4b5563);
}
.metering-feedback {
  min-height: 1rem;
  font-size: 0.85rem;
  color: var(--muted, #4b5563);
}
.metering-feedback .issue {
  color: var(--danger, #b3261e);
}
.metering-feedback .warning {
  color: var(--warning, #d97706);
}
.meter-base .field.is-invalid input,
.meter-base .field.is-invalid select {
  border-color: var(--danger, #b3261e);
  box-shadow: 0 0 0 1px rgba(179, 38, 30, 0.25);
}
.meter-base .field.is-warning input,
.meter-base .field.is-warning select {
  border-color: var(--warning, #d97706);
  box-shadow: 0 0 0 1px rgba(217, 119, 6, 0.25);
}

.ctRatio {
  display: flex;flex-direction: row;
}


    #dir-explainer .why-chip-row {
        display: flex;
        flex-wrap: wrap;
        gap: 0.4rem;
        margin-top: 0.3rem;
    }
    #dir-explainer .why-chip {
        display: inline-flex;
        align-items: center;
        padding: 0.2rem 0.5rem;
        border-radius: 999px;
        font-size: 0.72rem;
        font-weight: 600;
    }
    #dir-explainer .why-chip.why-pass {
        background: rgba(25,135,84,0.15);
        color: rgb(25,135,84);
    }
    #dir-explainer .why-chip.why-block {
        background: rgba(220,53,69,0.15);
        color: rgb(200,35,51);
    }
    #dir-explainer .why-chip.why-warn {
        background: rgba(255,193,7,0.18);
        color: rgb(133,100,0);
    }
    #dir-explainer .why-chip.why-info {
        background: rgba(70,130,180,0.15);
        color: rgb(46,104,145);
    }
    #dir-explainer .dir-headline {
        margin-bottom: 0.35rem;
        font-weight: 600;
    }
    #scalar-mode-note[data-mode="manual"] {
        opacity: 0.65;
    }

    #app .secondary-panel {
        display: none;
    }
    body.secondary-open {
        overflow: hidden;
    }
    .secondary-modal {
        position: fixed;
        inset: 0;
        display: none;
        place-items: center;
        z-index: 1000;
    }
    .secondary-modal.is-open {
        display: grid;
    }
    .secondary-backdrop {
        position: absolute;
        inset: 0;
        background: rgba(8, 12, 20, 0.55);
    }
    .secondary-surface {
        position: relative;
        z-index: 1;
        width: min(1200px, 96vw);
        max-height: 92vh;
        overflow: auto;
        background: #fff;
        border: 1px solid var(--ui-border, #c9d1d9);
        border-radius: 1rem;
        box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
        padding: 1rem;
        display: flex;
        flex-direction: column;
        gap: 1rem;
    }
    .secondary-header {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        justify-content: space-between;
        gap: 0.75rem;
        position: sticky;
        top: 0;
        background: inherit;
        padding-bottom: 0.5rem;
        border-bottom: 1px solid var(--ui-border, #c9d1d9);
    }
    .secondary-heading h2 {
        margin: 0;
        font-size: 1.1rem;
    }
    .secondary-status {
        margin: 0;
        font-size: 0.85rem;
        opacity: 0.7;
    }
    .secondary-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        align-items: center;
    }
    .secondary-body {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: 1rem;
        align-items: start;
    }
    .secondary-body .secondary-panel {
        display: block;
    }
    .secondary-summary {
        font-size: 0.8rem;
        opacity: 0.75;
    }
    :root[data-theme="dark"] .secondary-surface {
        background: #0d1117;
        color: #e6edf3;
        border-color: #30363d;
    }
    :root[data-theme="dark"] .secondary-backdrop {
        background: rgba(3, 6, 12, 0.7);
    }