* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    padding: 32px 36px;

    font-family: "Figtree", Helvetica, Arial, sans-serif;
    color: var(--space-text);
    text-align: center;

    background: var(--space-background);
}

:root {
    --space-background: #0a0e1a;
    --space-panel: #131829;
    --space-panel-soft: #192038;

    --space-title: #e8ecf4;
    --space-text: #afb6d5;
    --space-muted: #8a93b4;

    --space-border: #1e2744;

    --so-orange: #f26522;
    --so-orange-dark: #d94f12;

    --so-blue: #609cf8;
    --so-blue-dark: #4f8be6;

    --harmonic-positive: #f26522;
    --harmonic-negative: #2864c7;

    --so-ink: var(--space-text);
    --so-muted: var(--space-muted);
    --so-background: var(--space-background);
    --so-panel-soft: var(--space-panel-soft);
    --so-border: var(--space-border);

    --secondary-button: #609cf8;
    --secondary-button-hover: #4f8be6;

    --slider-fill: #c7ccd6;
    --slider-empty: #eeeeee;
}

html {
    width: 100%;
}

#pageContent {
    width: 100%;
    max-width: 1536px;
    margin: 0 auto;
}

#header {
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 20px;

    width: 100%;
    max-width: 1536px;
    margin: 0 auto 24px;
}

.logo {
    width: 190px;
    height: auto;
    flex-shrink: 0;
}

#titleBlock {
    flex: 1;
    min-width: 0;

    text-align: left;
}

h1 {
    margin: 18px 0 0;

    color: var(--space-title);
    font-size: clamp(1.8rem, 3vw, 2.45rem);
    line-height: 1.12;
    font-weight: 700;
    letter-spacing: -0.04em;
}

.subtitle {
    margin-top: 12px;

    color: var(--so-muted);
    font-size: 0.95rem;
    font-weight: 400;
}

.mainNav {
    display: flex;
    align-items: center;
    gap: 1.35rem;

    font-size: 0.95rem;
    font-weight: 600;
}

.mainNav a {
    color: var(--space-text);
    text-decoration: none;
    white-space: nowrap;

    padding-bottom: 3px;
    border-bottom: 2px solid transparent;

    transition:
        color 0.2s ease,
        border-color 0.2s ease;
}

.mainNav a:hover,
.mainNav a:focus-visible {
    color: var(--so-orange);
}

.mainNav a.active {
    color: var(--space-title);
    border-bottom-color: var(--so-orange);
}

.harmonicLegend {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px 26px;

    margin-top: 0;

    color: var(--space-text);
    font-size: 0.95rem;
    line-height: 1;
    font-weight: 400;
}

.harmonicLegendItem {
    display: inline-flex;
    align-items: center;
    gap: 9px;

    white-space: nowrap;
}

.harmonicLegendSwatch {
    display: inline-block;
    width: 0.9em;
    height: 0.9em;

    border-radius: 3px;

    flex: 0 0 auto;
}

.harmonicLegendPositive {
    background: var(--harmonic-positive);
}

.harmonicLegendNegative {
    background: var(--harmonic-negative);
}

.harmonicLegendMagnitude {
    white-space: nowrap;
}

#canvasRow {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    width: 100%;
}

#cmbCanvas {
    image-rendering: auto;
}

.panel {
    position: relative;
    width: 100%;
    aspect-ratio: 500 / 340;

    background: #050505;
    border: 1px solid var(--so-border);

    /*
     * Square top-left and bottom-right,
     * rounded top-right and bottom-left.
     */
    border-radius: 18px 34px 18px 34px;

    overflow: hidden;
}

.panel h2 {
    position: absolute;
    top: 17px;
    left: 20px;
    z-index: 10;

    margin: 0;

    color: rgba(255, 255, 255, 0.96);
    font-size: 1rem;
    line-height: 1.2;
    font-weight: 400;
    letter-spacing: -0.01em;
    text-align: left;
}

#controlsRow {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;

    width: 100%;
    margin-top: 18px;
    font-size: 0.95rem;
}

.controlLabel,
.checkboxItem {
    color: var(--space-text);
}

#lmaxValue,
#mValue {
    color: var(--space-muted);
}

.controlColumn {
    width: 100%;
    min-width: 0;
}

.leftControls {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.leftControls .controlItem {
    display: grid;
    grid-template-columns: 105px minmax(0, 1fr) 32px;
    align-items: center;
    column-gap: 8px;
}

.checkboxItem {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 2px;
    white-space: nowrap;
    font-weight: 500;
    color: var(--space-text);
}

.rightControls {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.applicationRow {
    display: grid;
    grid-template-columns:
        minmax(0, 1.55fr)
        minmax(380px, 440px);

    gap: 36px;
    align-items: start;

    width: 100%;
    margin: 28px 0 42px;
}

.applicationVisual {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 10;
    min-height: 420px;
}

.applicationInfo {
    display: flex;
    flex-direction: column;
    gap: 26px;

    min-width: 0;
}

.applicationControls {
    display: flex;
    flex-direction: column;
    gap: 18px;

    width: 100%;
}

.applicationControls .controlItem {
    display: grid;
    grid-template-columns:
        28px minmax(0, 1fr) 34px;

    align-items: center;
    column-gap: 10px;
}

.applicationActions {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 16px;

    margin-top: 8px;
}

.applicationActions .checkboxItem {
    justify-content: flex-start;
    margin: 0;
    white-space: nowrap;
}

.applicationButtons {
    display: flex;
    align-items: center;
    gap: 14px;
}

.applicationButtons button {
    flex: 0 1 auto;
}

.applicationArticle {
    padding: 28px 30px;

    color: var(--space-text);
    text-align: left;

    background: var(--space-panel);

    border: 1px solid var(--space-border);
    border-radius: 18px 34px 18px 34px;
}

.applicationArticle h2 {
    margin: 0 0 18px;

    color: var(--space-title);
    font-size: 1.45rem;
    line-height: 1.15;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.applicationArticle p {
    margin: 0 0 16px;

    font-size: 1.05rem;
    line-height: 1.6;
}

.applicationArticle p:last-child {
    margin-bottom: 0;
}

.orbitalPanelHeader {
    position: absolute;
    top: 17px;
    left: 20px;
    right: 20px;
    z-index: 10;

    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 1.4rem;
}

/*
 * Override the general .panel h2 absolute positioning.
 */
.panel .orbitalPanelHeader h2 {
    position: static;

    flex: 0 0 auto;

    margin: 0;

    color: rgba(255, 255, 255, 0.96);
    font-size: 1rem;
    line-height: 1.2;
    font-weight: 400;
    letter-spacing: -0.01em;
    text-align: left;
}

.harmonicLegend.harmonicLegendPanel {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 8px 18px;

    margin: 0 0 0 18px;

    color: rgba(255, 255, 255, 0.82);
    font-size: 0.84rem;
    line-height: 1.2;
    font-weight: 400;
}

button {
    min-height: 54px;
    margin: 0;
    padding: 14px 28px;

    border: 1px solid transparent;
    border-radius: 999px;

    font-family: inherit;
    font-size: 0.98rem;
    font-weight: 400;
    line-height: 1.2;

    cursor: pointer;

    transition:
        background-color 0.18s ease,
        border-color 0.18s ease,
        color 0.18s ease,
        transform 0.08s ease;
}

button:active {
    transform: translateY(1px);
}

input[type="range"] {
    width: 100%;          /* keeps the same horizontal span */
    height: 30px;          /* larger click area */
    margin: 0;

    appearance: none;
    -webkit-appearance: none;

    background: transparent;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
    height: 12px;
    border: 1px solid #a9a9a9;
    border-radius: 999px;

    background: var(
        --slider-background,
        var(--slider-empty)
    );

    box-shadow:
        inset 0 1px 3px
        rgba(0, 0, 0, 0.18);
}

input[type="range"]::-moz-range-track {
    height: 12px;
    border: 1px solid #a9a9a9;
    border-radius: 999px;

    background: var(
        --slider-background,
        var(--slider-empty)
    );

    box-shadow:
        inset 0 1px 3px
        rgba(0, 0, 0, 0.18);
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;

    width: 24px;
    height: 24px;
    margin-top: -6px;

    border: 1px solid #999;
    border-radius: 50%;
    background: #e8e8e8;

    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.22);
}

input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;

    border: 1px solid #999;
    border-radius: 50%;
    background: #e8e8e8;

    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.22);
}

input[type="range"]:hover::-webkit-slider-thumb {
    background: #ffffff;
}

input[type="range"]:hover::-moz-range-thumb {
    background: #ffffff;
}

#lmaxSlider,
#mSlider,
#secondLSlider,
#secondMSlider {
    --slider-color: #c7ccd6;
}

#buildUniverseButton,
#explodeButton,
#buildMagneticFieldButton {
    background: var(--so-orange);
    border-color: var(--so-orange);
    color: white;
}

#buildUniverseButton:hover,
#explodeButton:hover,
#buildMagneticFieldButton:hover {
    background: #111111;
    border-color: #111111;
    color: white;
}

#newSeedButton,
#earthLikeFieldButton {
    background: var(--secondary-button);
    border-color: var(--secondary-button);
    color: #0b0e19;
}

#newSeedButton:hover,
#earthLikeFieldButton:hover {
    background: var(--secondary-button-hover);
    border-color: var(--secondary-button-hover);
}

#orbitalViewer,
#supernovaViewer,
#magneticViewer,
.cmbCanvasWrapper {
    position: absolute;
    left: 0;
    right: 0;
    top: 45px;
    bottom: 18px;
    overflow: hidden;
}

#orbitalViewer {
    cursor: grab;
    touch-action: none;
}

#orbitalViewer:active {
    cursor: grabbing;
}

#orbitalViewer canvas,
#supernovaViewer canvas,
#magneticViewer canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}

#supernovaViewer {
    position: absolute;
    left: 0;
    right: 0;
    top: 45px;
    bottom: 18px;

    width: 100%;
    overflow: hidden;
}

#supernovaViewer canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}

.cmbCanvasWrapper {
    display: flex;
    align-items: center;
    justify-content: center;
}

#cmbCanvas,
#distortionCanvas {
    display: block;
    width: 100%;
    height: auto;
    max-width: 100%;
    border: none;
}

#explanation {
    width: min(100%, 960px);
    margin: 54px auto 0;
    padding: 42px clamp(22px, 5vw, 54px);

    color: var(--space-text);
    text-align: left;

    background: var(--space-panel);

    border: 1px solid var(--space-border);
    border-radius: 18px 34px 18px 34px;
}

#explanation h2 {
    margin: 0 0 30px;

    color: var(--space-title);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    line-height: 1.15;
    font-weight: 700;
    letter-spacing: -0.025em;
}

#explanation p {
    max-width: 78ch;
    margin: 0 0 22px;

    font-size: 1.25rem;
    line-height: 1.65;
}

#explanation p:last-child {
    margin-bottom: 0;
}

#explanation strong {
    color: var(--so-orange);
    font-weight: 700;
}

#explanation .closing {
    margin-top: 34px;
    padding: 22px 24px;

    background: var(--space-panel-soft);
    border-left: 5px solid var(--so-orange);
    border-radius: 18px 34px 18px 34px;
}

#explanation a {
    color: var(--so-orange);
    font-family: inherit;
    font-weight: inherit;
    text-decoration: underline;        
    text-decoration-thickness: 0.08em;
    text-underline-offset: 0.14em;
}

#explanation a:visited {
    color: var(--so-orange);
}

#explanation a:hover {
    color: var(--space-title);
}

#explanation a:focus-visible {
    color: var(--space-title);
    outline: 2px solid var(--so-orange);
    outline-offset: 3px;
    border-radius: 2px;
}

footer {
    margin-top: 42px;
    padding: 22px 0;

    color: var(--so-muted);
    font-size: 0.82rem;
    letter-spacing: 0.01em;

    border-top: 1px solid var(--so-border);
}

.menuContainer {
    position: relative;
    margin-left: auto;
    padding-top: 20px;
    z-index: 100;
}

.menuButton {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;

    width: 50px;
    height: 50px;
    min-height: 0;
    padding: 11px;

    background: var(--space-panel);
    border: 1px solid var(--space-border);
    border-radius: 50%;

    cursor: pointer;
}

.menuButton:hover {
    background: var(--space-panel-soft);
}

.menuButton span {
    display: block;
    width: 100%;
    height: 3px;

    background: var(--space-title);
    border-radius: 999px;
}

/*
 * Turn the three lines into an X while open.
 */
.menuButton[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.menuButton[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.menuButton[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

.siteMenu {
    position: absolute;
    top: 78px;
    right: 0;

    min-width: 220px;
    padding: 10px;

    text-align: left;

    background: var(--space-panel);
    border: 1px solid var(--space-border);
    border-radius: 14px 24px 14px 24px;

    box-shadow:
        0 12px 30px rgba(0, 0, 0, 0.35);
}

.siteMenu[hidden] {
    display: none;
}

.siteMenu a {
    display: block;
    padding: 13px 16px;

    color: var(--space-title);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;

    border-radius: 10px;
}

.siteMenu a:hover,
.siteMenu a:focus-visible {
    color: white;
    background: var(--so-orange);
    outline: none;
}

.secondHarmonicControls {
    margin-top: 12px;
    padding-top: 16px;

    border-top: 1px solid var(--space-border);
}

.secondHarmonicToggle {
    display: flex;
    align-items: center;
    gap: 8px;

    margin-bottom: 14px;

    color: var(--space-text);
    font-size: 0.95rem;
    font-weight: 500;
}

.secondHarmonicControls .controlItem + .controlItem {
    margin-top: 14px;
}

.secondHarmonicControl input:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.secondHarmonicControl:has(input:disabled) {
    opacity: 0.6;
}

/* ---------- Responsive adjustments ---------- */

@media (max-width: 980px) {

    .applicationRow {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .applicationVisual,
    .applicationInfo {
        width: 100%;
        max-width: 760px;
        margin-inline: auto;
    }

    .applicationVisual {
        aspect-ratio: 16 / 10;
        min-height: 340px;
    }
}

@media (max-width: 850px) {

    body {
        padding: 24px;
    }

    #canvasRow,
    #controlsRow {
        grid-template-columns: 1fr;
    }

    .panel {
        max-width: 600px;
        margin-inline: auto;
    }

    .controlColumn {
        max-width: 600px;
        margin-inline: auto;
    }

    .rightControls {
        flex-wrap: wrap;
    }
}

@media (max-width: 560px) {

    body {
        padding: 16px;
    }

    #header {
        display: grid;
        grid-template-columns: auto minmax(0, 1fr) auto;
        align-items: start;
    }

    #titleBlock {
        align-self: start;
    }

    .harmonicLegendMagnitude {
        white-space: normal;
    }

    .logo {
        width: 110px;
    }

    h1 {
        color: var(--space-title);
    }

    .subtitle {
        color: var(--space-muted);
    }

    .panel {
        aspect-ratio: 500 / 360;
    }

    .panel h2 {
        top: 14px;
        left: 16px;
        font-size: 0.9rem;
    }

    .leftControls .controlItem {
        grid-template-columns: 88px minmax(0, 1fr) 28px;
        column-gap: 6px;
    }

    .controlLabel {
        font-size: 0.88rem;
    }

    .rightControls {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .applicationRow {
        gap: 20px;
        margin-bottom: 34px;
    }

    .applicationVisual {
        aspect-ratio: 4 / 3;
        min-height: 280px;
    }

    .applicationInfo {
        gap: 18px;
    }

    .applicationControls {
        gap: 12px;
    }

    .applicationControls .controlItem {
        grid-template-columns: 24px minmax(0, 1fr) 28px;
        column-gap: 8px;
    }

    .applicationActions {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .applicationActions .checkboxItem {
        justify-content: center;
        white-space: normal;
        margin-right: 0;
    }

    .applicationArticle {
        padding: 22px 20px;
    }

    .applicationArticle h2 {
        font-size: 1.25rem;
        margin-bottom: 14px;
    }

    .applicationArticle p {
        font-size: 1rem;
        line-height: 1.55;
    }

    .applicationButtons {
        flex-direction: column;
        align-items: stretch;
    }

    .applicationButtons button {
        width: 100%;
    }

    .checkboxItem {
        justify-content: center;
        white-space: normal;
    }

    button {
        width: 100%;
        min-height: 48px;
    }

    #explanation {
        margin-top: 32px;
        padding: 28px 20px;
    }

    #explanation h2 {
        font-size: 1.25rem;
    }

    #explanation p {
        font-size: 1.05rem;
        line-height: 1.65;
    }

    .menuContainer {
        padding-top: 0;
    }

    .menuButton {
        display: flex;
        width: 44px;
        height: 44px;
        padding: 10px;
    }

    .siteMenu {
        top: 58px;
        right: 0;
    }

    .mainNav {
        display: none;
    }

    .orbitalPanelHeader {
        top: 14px;
        left: 16px;
        right: 16px;

        align-items: flex-start;
        flex-direction: column;
        gap: 0.45rem;
    }

    .panel .orbitalPanelHeader h2 {
        font-size: 0.9rem;
    }

    .harmonicLegend.harmonicLegendPanel {
        justify-content: flex-start;
        gap: 6px 13px;

        margin: 0 0 0 18px;

        font-size: 0.75rem;
        white-space: normal;
    }

    /*
     * Leave room for the two-row header.
     */
    #orbitalViewer {
        top: 82px;
    }
}