/* ==========================================================================
   01. Design tokens
   ========================================================================== */

/*
CSS governance:
- Put new styles in the correct numbered section below.
- Page-specific selectors should stay page-scoped.
- Reusable UI belongs in Shared components.
- New colours should use palette or role tokens from Design tokens.
- Uncertain historical styles belong in Legacy quarantine, not silent deletion.
*/

:root {
    /* Raw palette: keep compact and add variants only for named roles. */
    --color-navy-950: #041843;
    --color-navy-900: #0a1f52;
    --color-blue-600: #2d5a9f;
    --color-blue-200: #c5d9f2;
    --color-slate-700: #3d4b5c;
    --color-slate-500: #6b7a8f;
    --color-slate-200: #d8dfe8;
    --color-slate-100: #e8ecf2;
    --color-paper: #f5f7fa;
    --color-white: #ffffff;

    --color-success: #2e8b7e;
    --color-success-light: #d4ede9;
    --color-warning: #a67c3d;
    --color-warning-light: #f5e8d6;
    --color-danger: #a3424f;
    --color-danger-light: #f5dde1;

    /* Role tokens: component styles should use these before raw palette values. */
    --surface-page: var(--color-paper);
    --surface-panel: var(--color-white);
    --surface-panel-subtle: #fbfcfe;
    --surface-muted: var(--color-slate-100);
    --surface-dark: var(--color-navy-950);
    --surface-dark-soft: var(--color-navy-900);
    --surface-dark-panel: rgba(49, 73, 110, 0.72);
    --surface-dark-strong: rgba(10, 31, 82, 0.9);
    --text-primary: var(--color-navy-900);
    --text-secondary: var(--color-slate-700);
    --text-muted: var(--color-slate-500);
    --text-on-dark: var(--color-white);
    --text-on-dark-muted: var(--color-blue-200);
    --border-soft: var(--color-slate-200);
    --border-control: var(--color-blue-200);
    --border-emphasis: var(--color-slate-500);
    --link-color: var(--color-blue-600);
    --link-on-dark: var(--color-blue-200);
    --focus-ring: rgba(45, 90, 159, 0.22);
    --accent-color: var(--color-blue-600);
    --accent-hover: var(--color-blue-600);
    --header-surface: var(--surface-dark);
    --header-text: var(--text-on-dark);
    --header-border: rgba(197, 217, 242, 0.18);
    --footer-surface: var(--surface-dark);
    --footer-text: var(--text-on-dark);

    --font-family-sans: 'Red Hat Display', sans-serif;
    --base-font-size: 14px;
    --font-size-title: 3.2857rem;
    --font-size-xlarge: 1.5714rem;
    --font-size-large: 1.2857rem;
    --font-size-medium: 1rem;
    --font-size-small: 0.875rem;
    --font-size-xsmall: 0.75rem;
    --font-size-xxsmall: 0.6429rem;

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-9: 36px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-pill: 999px;
    --border-width: 1px;
    --shadow-panel: 0 18px 42px rgba(10, 31, 82, 0.08);
    --shadow-floating: 0 18px 40px rgba(2, 10, 28, 0.34);

    --header-height: 64px;
    --footer-height: 56px;
    --sidebar-width: clamp(400px, 30vw, 460px);
    --sidebar-x-padding: 28px;
    --simulation-workbench-max-width: 1680px;
    --simulation-workbench-gutter: clamp(20px, 4vw, 72px);
    --simulation-workbench-top-padding: 28px;
    --simulation-output-top-padding: 0px;
    --simulation-output-x-padding: 32px;
    --simulation-sidebar-section-padding-y: 20px;
    --simulation-sidebar-compact-section-padding-y: 14px;
    --simulation-sidebar-internal-gap: 10px;
    --simulation-sidebar-heading-gap: 10px;
    --simulation-sidebar-field-gap: 5px;
    --simulation-sidebar-control-gap: 10px;
    --simulation-sidebar-grid-gap: 16px;
    --site-header-height: var(--header-height);
    --site-content-width: 1480px;
    --site-gutter: clamp(20px, 5vw, 72px);
    --app-content-height: calc(100vh - var(--header-height) - var(--footer-height));
    --transition-fast: 0.2s ease;
    --transition-standard: 0.3s ease;
}

/* ==========================================================================
   02. Base elements and resets
   ========================================================================== */

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-medium);
  margin: 0;
}

::selection {
    background: var(--color-blue-200);
    color: var(--color-navy-950);
}

::-moz-selection {
    background: var(--color-blue-200);
    color: var(--color-navy-950);
}

/* ==========================================================================
   03. App shell: header, footer, body
   ========================================================================== */

.main-layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.math-layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    flex: none;
}

.body {
    box-sizing: border-box;
    flex: auto;
    margin: var(--header-height) 0 0;
    min-height: var(--app-content-height);
    overflow: visible;
}

.footer {
    flex: none;
    position: static;
    width: 100%;
}

.footer > * {
    min-height: var(--footer-height);
}

.site-footer {
    align-items: center;
    background: var(--surface-dark);
    border-top: 1px solid var(--header-border);
    box-sizing: border-box;
    display: flex;
    justify-content: flex-end;
    min-height: var(--footer-height);
    padding: 0 var(--site-gutter);
}

.site-footer-link {
    align-items: center;
    color: var(--link-on-dark);
    display: inline-flex;
    font-size: var(--font-size-small);
    gap: 8px;
    font-weight: 800;
    letter-spacing: 0;
    text-decoration: none;
}

.site-footer-link:hover {
    color: var(--text-on-dark);
    text-decoration: underline;
}

.site-footer-icon {
    filter: brightness(0) invert(1);
    height: 20px;
    width: 20px;
}

.site-header {
    background: var(--header-surface);
    border-bottom: 1px solid var(--header-border);
    box-sizing: border-box;
    flex: none;
    left: 0;
    min-height: var(--site-header-height);
    position: fixed;
    right: 0;
    top: 0;
    width: 100%;
    z-index: 200;
}

.site-nav {
    align-items: center;
    display: flex;
    gap: 20px;
    justify-content: space-between;
    margin: 0 auto;
    max-width: var(--site-content-width);
    min-height: var(--site-header-height);
    padding: 0 var(--site-gutter);
    position: relative;
}

.site-brand-block {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.site-brand {
    color: var(--text-on-dark);
    cursor: default;
    font-size: var(--font-size-large);
    font-weight: 800;
    line-height: 1.2;
    white-space: nowrap;
}

.site-page-subtitle {
    color: var(--text-on-dark-muted);
    font-size: var(--font-size-small);
    font-weight: 700;
    line-height: 1.2;
}

.site-nav-link {
    border-radius: 8px;
    color: var(--link-on-dark);
    display: block;
    font-size: var(--font-size-small);
    font-weight: 700;
    line-height: 1.2;
    padding: 9px 11px;
    text-decoration: none;
}

.site-nav-link:hover,
.site-nav-link-active {
    background: rgba(215, 230, 244, 0.12);
    color: var(--text-on-dark);
    text-decoration: none;
}

.site-nav-menu {
    display: block;
    position: relative;
}

.site-nav-toggle {
    align-items: center;
    border-radius: 8px;
    cursor: pointer;
    display: inline-flex;
    flex-direction: column;
    gap: 5px;
    height: 40px;
    justify-content: center;
    list-style: none;
    width: 40px;
}

.site-nav-toggle::-webkit-details-marker {
    display: none;
}

.site-nav-toggle:hover {
    background: rgba(215, 230, 244, 0.12);
}

.site-nav-toggle-bar {
    background: var(--link-on-dark);
    border-radius: 999px;
    display: block;
    height: 2px;
    width: 22px;
}

.site-nav-panel {
    background: var(--surface-dark-soft);
    border: 1px solid var(--header-border);
    border-radius: 8px;
    box-shadow: 0 18px 40px rgba(2, 10, 28, 0.34);
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 220px;
    padding: 8px;
    position: absolute;
    right: 0;
    top: 48px;
}

.title-section {
    background: var(--surface-muted);
    text-align: left;
    padding: 18px 36px;
    margin: 0;
    box-sizing: border-box;
    position: relative;
}

.title-text {
    color: var(--text-primary);
    font-family: var(--font-family-sans);
    font-size: var(--font-size-title);
    font-weight: 600;
    text-align: left;
    padding: 0;
    margin: 0;
    /*background-color: rgba(255, 0, 0, 0.1) !important; !* Light red background for debugging *!*/
}

.title-underline {
    position: absolute;
    bottom: 0;
    left: 36px;
    height: 1px;
    background-color: var(--text-primary);
    width: calc(100% - 72px);
}

.main-layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ==========================================================================
   04. Shared components
   ========================================================================== */

.button, .Select-control, .label, .button-show, .button-hide {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-small);
}

.inputs {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--surface-muted);
    max-width: 100%;
    justify-content: space-between;
}

.input-group {
    background-color: var(--surface-muted);
    display: flex;
    flex-direction: column;
    padding: 18px 36px 18px 36px; /* Apply padding to each input group */
    flex-grow: 1;
}

.model-system-group {
    margin-top: auto !important;
}

.initial-conditions-group {
    margin-bottom: auto !important;
}

.split-inputs {
    display: flex;
    flex-direction: row;
    gap: 10px;
}

.input-columns {
    width: 100%;
    box-sizing: border-box;
}

.unity-parameters-button {
    margin-bottom: 10px;
}

.inputs-title {
    color: var(--text-primary);
    font-size: var(--font-size-medium);
    font-weight: 600;
    margin-bottom: 10px;
}

.time-title {
    margin-top: 20px;
}

.label {
    color: var(--text-primary);
    margin-top: 10px;
    margin-bottom: 10px;
}

.input-subtext {
    color: var(--text-primary);
    font-size: var(--font-size-small);
}

.button, .button-show {
    width: 100%;
    cursor: pointer;
    background-color: var(--surface-panel);
    color: var(--text-primary);
    border: 2px solid var(--text-primary);
    border-radius: 25px !important;
    text-align: center;
    padding: 5px 5px;
    transition: background-color 0.3s ease, color 0.3s ease; /* Smooth transition on hover */
}

.button:hover, .button-show:hover {
    background-color: var(--text-primary);
    color: var(--text-on-dark);
}

.input, .parameters-input .time-vector-input {
    width: 100%;
    border: 1px solid var(--text-primary);
    border-radius: 10px;
    color: var(--text-primary);
    box-sizing: border-box;
    background-color: var(--surface-panel);
    font-size: var(--font-size-xsmall);
    text-align: center;
    padding: 5px 5px;
    margin-bottom: 15px;
}

.time-vector-input .initial-conditions-input-bottom {
    margin-bottom: 0;
}

.dropdown {
    width: 100%;
    max-width: 100%;
    flex-grow: 1;
    color: var(--text-primary);
    background-color: var(--surface-panel);
    border-radius: 10px;
    text-align: center;
    box-sizing: border-box;
}

.input:focus, .dropdown:focus {
    border-color: var(--accent-color); /* Darker purple border on focus */
    outline: none; /* Remove the default outline */
}

.content-container {
    display: flex;
    justify-content: flex-end;
    flex-grow: 1;
    width: 100%;
    box-sizing: border-box;
}

.side-bar {
    display: flex;
    flex-grow: 1;
    flex-direction: column;
    justify-content: space-between;
    max-width: 25%;
    background-color: var(--surface-muted);
    height: 100%;
}

.graph-section {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 75%;
    height: 100%;
    /*background-color: rgba(0, 255, 0, 0.1); !* Light green background for debugging *!*/
    background-color: var(--surface-panel);
}

.above-graph-container {
    display: flex;
    justify-content: center; /* Center horizontally */
    align-items: flex-start; /* Align to top */
    width: 100%;
    /*background-color: rgba(255, 0, 0, 0.1); !* Light red background for debugging *!*/
    background-color: var(--surface-panel);
    gap: 40px;
}

.graph-wrapper {
    display: flex;
    flex-direction: column;
    justify-content: center; /* Center horizontally */
    align-items: center;
    width: 100%;
    /*background-color: rgba(0, 255, 0, 0.1); !* Light green background for debugging *!*/
    background-color: var(--surface-panel);
    padding: 0;
}

.time-graph-section {
    display: flex;
    justify-content: center; /* Center the graph container horizontally */
    align-items: center; /* Center the graph container vertically */
    width: 100%;
    background-color: var(--surface-muted);
    /*background-color: rgba(255, 0, 255, 0.2); !* Light purple background for debugging *!*/
    padding: 36px 36px;
}

.graph-container {
    width: 100%;
    background-color: var(--surface-panel);
    /*background-color: rgba(0, 255, 0, 0.1); !* Light green background for debugging *!*/
    margin: 0 auto;
}

.responsive-graph {
    width: 100%;
    height: auto;
    padding: 0;
}

.graph-title {
    font-size: var(--font-size-medium);
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
}

.error-message {
    color: var(--color-danger);
    text-align: center;
    font-size: var(--font-size-large);
    margin: 0;
}

/* ==========================================================================
   05. Home page
   ========================================================================== */

.home-page {
    background: var(--surface-dark);
    color: var(--text-on-dark);
    min-height: 100vh;
}

.home-hero {
    background-color: var(--surface-dark);
    background-position: center;
    background-size: cover;
    min-height: 100vh;
    overflow: hidden;
    position: relative;
}

.home-hero::before {
    background:
        radial-gradient(circle at 77% 40%, rgba(115, 133, 156, 0.08) 0%, rgba(4, 24, 67, 0.12) 34%, rgba(4, 24, 67, 0.46) 100%),
        linear-gradient(90deg, rgba(3, 14, 38, 0.84) 0%, rgba(6, 28, 68, 0.56) 44%, rgba(4, 24, 67, 0.14) 100%),
        linear-gradient(180deg, rgba(4, 24, 67, 0.04) 0%, rgba(3, 14, 38, 0.4) 100%);
    content: "";
    inset: 0;
    pointer-events: none;
    position: absolute;
}

.home-hero-inner {
    align-items: start;
    display: grid;
    gap: clamp(32px, 7vw, 96px);
    grid-template-areas:
        "copy explore"
        "lower explore";
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.58fr);
    grid-template-rows: auto minmax(0, 1fr);
    margin: 0 auto;
    max-width: var(--site-content-width);
    min-height: 100vh;
    padding: clamp(64px, 11vh, 132px) var(--site-gutter) clamp(32px, 6vh, 64px);
    position: relative;
    width: 100%;
    z-index: 1;
}

.home-copy {
    grid-area: copy;
    max-width: 760px;
}

.home-hero-title {
    color: var(--text-on-dark);
    font-size: clamp(3rem, 6.2vw, 6.6rem);
    font-weight: 800;
    line-height: 0.98;
    margin: 0 0 26px;
}

.home-hero-description {
    color: var(--text-on-dark-muted);
    font-size: clamp(1.08rem, 1.65vw, 1.45rem);
    font-weight: 600;
    line-height: 1.5;
    margin: 0 0 28px;
    max-width: 720px;
}

.home-hero-note {
    border-left: 3px solid rgba(215, 230, 244, 0.54);
    color: rgba(215, 230, 244, 0.76);
    font-size: 1rem;
    font-style: italic;
    font-weight: 600;
    line-height: 1.5;
    margin: 0;
    max-width: 640px;
    padding-left: 20px;
}

.home-lower-left {
    align-self: end;
    display: flex;
    flex-direction: column;
    gap: 22px;
    grid-area: lower;
    max-width: 860px;
}

.home-further-reading {
    max-width: 860px;
}

.home-further-reading-heading {
    color: var(--color-blue-200);
    font-size: var(--font-size-small);
    font-weight: 800;
    line-height: 1.2;
    margin: 0 0 18px;
    text-transform: uppercase;
}

.home-reading-list {
    display: grid;
    gap: 16px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.home-reading-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.home-reading-title {
    color: var(--text-on-dark);
    font-size: 1rem;
    font-weight: 800;
    line-height: 1.32;
    text-decoration: none;
}

.home-reading-title:hover {
    color: var(--link-on-dark);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.home-reading-role {
    color: rgba(196, 208, 223, 0.72);
    font-size: var(--font-size-small);
    font-weight: 650;
    line-height: 1.42;
    margin: 0;
}

.home-attribution {
    align-items: center;
    color: rgba(196, 208, 223, 0.62);
    display: inline-flex;
    flex-wrap: wrap;
    gap: 8px;
    font-size: var(--font-size-small);
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
    width: fit-content;
}

.home-attribution:hover {
    color: var(--link-on-dark);
    text-decoration: none;
}

.home-attribution:hover .home-attribution-icon {
    opacity: 1;
}

.home-attribution-icon {
    display: block;
    filter: invert(1);
    height: 17px;
    opacity: 0.62;
    width: 17px;
}

.home-explore-panel {
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    background: rgba(30, 53, 92, 0.6);
    border: 1px solid rgba(215, 230, 244, 0.16);
    border-radius: 8px;
    box-shadow: 0 20px 54px rgba(4, 24, 67, 0.4);
    display: flex;
    flex-direction: column;
    gap: clamp(16px, 2.6vh, 28px);
    grid-area: explore;
    margin-top: clamp(18px, 4vh, 54px);
    padding: clamp(22px, 3vw, 36px);
}

.home-explore-heading {
    color: var(--text-on-dark);
    font-size: var(--font-size-xlarge);
    font-weight: 800;
    line-height: 1.2;
    margin: 0 0 4px;
}

.home-explore-link {
    align-items: flex-start;
    border-top: 1px solid rgba(215, 230, 244, 0.14);
    color: var(--text-on-dark);
    display: flex;
    gap: 16px;
    padding: 18px 0 0;
    text-decoration: none;
}

.home-explore-link:hover {
    color: var(--text-on-dark);
    text-decoration: none;
}

.home-explore-number {
    color: var(--color-blue-200);
    flex: 0 0 42px;
    font-size: var(--font-size-large);
    font-weight: 800;
    line-height: 1.2;
}

.home-explore-link:hover .home-explore-number,
.home-explore-link:hover .home-explore-title {
    color: var(--link-on-dark);
}

.home-explore-copy {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.home-explore-title {
    color: var(--text-on-dark);
    font-size: var(--font-size-large);
    font-weight: 800;
    line-height: 1.24;
}

.home-explore-description {
    color: rgba(196, 208, 223, 0.78);
    font-size: var(--font-size-small);
    font-weight: 650;
    line-height: 1.42;
}

/* ==========================================================================
   06. Equations page
   ========================================================================== */

.math-sidebar {
    background-color: var(--surface-muted);
}

.markdown-latex-container {
  background-color: var(--surface-panel-subtle);
  border: 1px solid var(--border-soft);
  overflow-x: auto; /* Allows scrolling if content is too wide */
  overflow-y: hidden; /* Hides vertical scrollbar */
  width: 90%; /* Takes up 90% of the width */
  padding: 8px 16px;
  box-sizing: border-box;
  margin-bottom: 0;
  margin-left: auto;
  margin-right: auto;
}

.references-section {
    background: var(--surface-muted);
    text-align: left;
    padding: 16px 32px; /* 16 pixels padding top/bottom, 32px left/right */
    box-sizing: border-box;
    margin: 0;
}

.references-line {
    position: relative;
    top: 0;
    height: 1px;
    background-color: var(--text-primary);
    width: 100%;
    padding: 0;
    margin-bottom: 16px;
}

.references-section h2 {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-xlarge);
    color: var(--text-primary);
}

.references-section ul {
    list-style-type: none;
    padding: 0;
}

.references-section li {
    margin-bottom: 10px;
}

.references-section a {
    color: var(--link-color);
    text-decoration: none;
    font-family: var(--font-family-sans);
}

.references-section a:hover {
    text-decoration: underline;
}

.equations-layout {
    --equations-document-max-width: 1020px;
    --equations-document-width: min(
        var(--equations-document-max-width),
        calc(100% - clamp(32px, 10vw, 120px) - 100px)
    );
    background: var(--surface-page);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.equations-layout .body {
    background: var(--surface-page);
    display: flex;
    justify-content: center;
    min-width: 0;
}

.equations-layout .site-nav {
    box-sizing: border-box;
    max-width: var(--equations-document-max-width);
    padding-left: 0;
    padding-right: 0;
    width: var(--equations-document-width);
}

.equations-page {
    background: var(--surface-panel);
    border: 1px solid var(--border-soft);
    box-shadow: 0 18px 42px rgba(10, 31, 82, 0.06);
    box-sizing: border-box;
    margin: 0 auto;
    max-width: var(--equations-document-max-width);
    min-height: var(--app-content-height);
    min-width: 0;
    overflow-x: clip;
    padding: 56px 64px 72px;
    width: var(--equations-document-width);
}

.equations-hero {
    display: grid;
    gap: 28px;
    grid-template-columns: 1fr;
    margin-bottom: 52px;
}

.equations-hero-copy {
    background: var(--surface-panel-subtle);
    border: 1px solid var(--border-soft);
    border-left: 5px solid var(--accent-color);
    border-radius: 8px;
    box-shadow: 0 16px 36px rgba(10, 31, 82, 0.05);
    padding: 36px 40px;
}

.equations-eyebrow {
    color: var(--accent-color);
    font-size: var(--font-size-small);
    font-weight: 800;
    letter-spacing: 0;
    line-height: 1.2;
    margin: 0 0 10px;
    text-transform: uppercase;
}

.equations-hero-title {
    color: var(--text-primary);
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.05;
    margin: 0 0 22px;
    max-width: 780px;
}

.equations-hero-text p,
.equations-section-lead,
.equations-branch-summary,
.equations-model-summary p,
.equation-markdown p {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.56;
    margin: 0;
    max-width: 72ch;
}

.equations-hero-text {
    display: block;
    margin-top: 16px;
    max-width: 72ch;
}

.equations-model-section {
    margin: 0 0 60px;
}

.equations-model-grid {
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    min-width: 0;
}

.equations-model-card {
    background: var(--surface-panel);
    border: 1px solid var(--border-soft);
    border-radius: 8px;
    box-shadow: 0 12px 28px rgba(10, 31, 82, 0.06);
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-height: 500px;
    min-width: 0;
    padding: 28px;
}

.equations-model-image-wrap {
    align-items: center;
    background: var(--surface-panel-subtle);
    border-radius: 8px;
    display: flex;
    flex: 1 1 auto;
    justify-content: center;
    min-height: 300px;
    padding: 14px;
}

.equations-model-image {
    height: 320px;
    max-width: 100%;
    object-fit: contain;
    width: 100%;
}

.equations-model-copy {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding: 0;
}

.equations-model-title,
.equations-branch-title,
.equations-block-title {
    color: var(--text-primary);
    font-weight: 800;
    line-height: 1.2;
    margin: 0 0 12px;
}

.equations-model-title,
.equations-branch-title {
    font-size: 1.25rem;
}

.equations-block-title {
    font-size: 1.15rem;
}

.equations-model-detail-list,
.equations-branch-list {
    display: grid;
    gap: 8px;
    margin: 0;
    padding-left: 18px;
}

.equations-model-detail-list li,
.equations-branch-list li {
    color: var(--text-muted);
    padding-left: 2px;
}

.equations-model-detail p,
.equations-branch-point p,
.equations-block-note p {
    color: var(--text-muted);
    font-size: var(--font-size-small);
    font-weight: 650;
    line-height: 1.45;
    margin: 0;
}

.equations-section,
.equations-branching {
    border-top: 1px solid var(--border-soft);
    margin-top: 60px;
    min-width: 0;
    padding: 44px 0 0;
}

.equations-section-heading {
    margin-bottom: 32px;
    max-width: 820px;
}

.equations-section-title {
    color: var(--text-primary);
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.15;
    margin: 0 0 14px;
    max-width: 760px;
}

.equations-block-stack {
    display: grid;
    gap: 0;
    min-width: 0;
}

.equations-block {
    border-bottom: 1px solid var(--border-soft);
    min-width: 0;
    padding: 0 0 28px;
}

.equations-block + .equations-block,
.equations-block + .equations-details-block,
.equations-details-block + .equations-block,
.equations-details-block + .equations-details-block {
    padding-top: 28px;
}

.equations-details-block {
    background: transparent;
    border-bottom: 1px solid var(--border-soft);
    border-radius: 0;
    min-width: 0;
    padding: 0 0 28px;
}

.equations-block-note {
    background: var(--surface-panel-subtle);
    border-left: 3px solid var(--accent-color);
    border-radius: 0 8px 8px 0;
    margin-top: 18px;
    padding: 14px 16px;
}

.equations-branch-grid {
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    min-width: 0;
}

.equations-branch-card {
    background: var(--surface-panel-subtle);
    border: 1px solid var(--border-soft);
    border-radius: 8px;
    color: inherit;
    display: block;
    font: inherit;
    min-width: 0;
    padding: 22px;
    text-align: left;
    text-decoration: none;
    width: 100%;
}

.equations-branch-card:hover,
.equations-branch-card:focus-visible {
    border-color: var(--accent-color);
    box-shadow: 0 12px 26px rgba(10, 31, 82, 0.08);
    color: inherit;
    cursor: pointer;
    outline: none;
    text-decoration: none;
}

.equations-branch-card--active {
    border-color: var(--accent-color);
    box-shadow: 0 12px 26px rgba(10, 31, 82, 0.08);
}

.equations-details-summary {
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 800;
    line-height: 1.2;
}

.equations-details-body {
    margin-top: 20px;
}

.equation-markdown {
    max-width: 100%;
    min-width: 0;
    overflow-x: auto;
    overflow-y: hidden;
}

.equation-markdown p + p {
    margin-top: 12px;
}

.equation-markdown p,
.equation-markdown li {
    overflow-wrap: anywhere;
}

.equation-markdown mjx-container {
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 4px;
}

.equation-markdown mjx-container[display="true"] {
    margin: 18px auto;
}

.equations-page .references-section {
    background: transparent;
    padding: 48px 0 0;
}

.equations-page .references-line {
    background-color: var(--border-soft);
}

.equations-page .references-section h2 {
    color: var(--text-primary);
}

/* ==========================================================================
   07. Simulation page
   ========================================================================== */

.simulation-layout {
    background: var(--surface-page);
    min-height: 100vh;
}

.simulation-layout .body {
    background: var(--surface-page);
    min-width: 0;
}

.simulation-workspace {
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    min-height: var(--app-content-height);
    min-width: 0;
    padding: 0 var(--simulation-workbench-gutter) 0;
    scroll-margin-top: var(--site-header-height);
    width: 100%;
}

.simulation-workspace-primary {
    align-items: stretch;
    background: var(--surface-panel);
    border: 1px solid var(--border-soft);
    box-shadow: 0 18px 42px rgba(10, 31, 82, 0.06);
    box-sizing: border-box;
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
    min-height: var(--app-content-height);
    min-width: 0;
    max-width: var(--simulation-workbench-max-width);
    overflow: visible;
    width: 100%;
}

.simulation-layout .site-nav {
    box-sizing: border-box;
    max-width: calc(var(--simulation-workbench-max-width) + var(--simulation-workbench-gutter) + var(--simulation-workbench-gutter));
    padding-left: var(--simulation-workbench-gutter);
    padding-right: var(--simulation-workbench-gutter);
    width: 100%;
}

.simulation-layout .side-bar {
    align-self: start;
    background: var(--surface-panel);
    border-right: 1px solid var(--border-soft);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    height: calc(100vh - var(--site-header-height));
    max-width: none;
    max-height: calc(100vh - var(--site-header-height));
    min-width: 0;
    overflow: hidden;
    position: sticky;
    top: var(--site-header-height);
    width: var(--sidebar-width);
}

.simulation-layout .inputs {
    background: var(--surface-panel);
    display: flex;
    flex-direction: column;
    height: 100%;
    justify-content: flex-start;
    min-height: 0;
    min-width: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
}

.simulation-layout .simulation-config-column {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.simulation-layout .input-group {
    background: transparent;
    flex-grow: 0;
    gap: var(--simulation-sidebar-internal-gap);
    min-width: 0;
    padding: var(--simulation-sidebar-section-padding-y) var(--sidebar-x-padding);
}

.simulation-layout .input-group:last-child {
    border-bottom: 0;
}

.simulation-layout .model-system-group,
.simulation-layout .initial-conditions-group {
    margin-bottom: 0 !important;
    margin-top: 0 !important;
}

.simulation-layout .run-group {
    background: var(--surface-panel);
    border-bottom: 0;
    border-top: 1px solid var(--border-soft);
    bottom: 0;
    box-shadow: 0 -8px 18px rgba(13, 41, 90, 0.04);
    gap: var(--simulation-sidebar-internal-gap);
    margin-top: auto;
    padding: 12px var(--sidebar-x-padding) 16px;
    position: sticky;
    z-index: 2;
}

.simulation-layout .inputs-title,
.simulation-layout .label,
.simulation-layout .input-subtext {
    color: var(--text-primary);
}

.simulation-layout .inputs-title {
    margin: 0;
}

.simulation-layout .button,
.simulation-layout .button-show {
    background-color: var(--surface-panel);
    border: 1px solid var(--border-control);
    border-radius: 8px !important;
    color: var(--text-primary);
    font-weight: 700;
    min-height: 34px;
}

.simulation-layout .button:hover,
.simulation-layout .button-show:hover {
    background-color: var(--surface-panel-subtle);
    border-color: var(--link-color);
    color: var(--link-color);
}

.simulation-layout .input,
.simulation-layout .parameters-input .time-vector-input {
    border: 1px solid var(--border-control);
    border-radius: 8px;
    box-sizing: border-box;
    color: var(--text-primary);
    max-width: 100%;
    min-height: 34px;
    min-width: 0;
    width: 100%;
}

.simulation-layout .split-inputs {
    gap: var(--simulation-sidebar-grid-gap);
}

.simulation-layout .input-columns {
    display: flex;
    flex-direction: column;
    gap: var(--simulation-sidebar-field-gap);
}

.simulation-layout .unity-parameters-button {
    margin: 0;
}

.simulation-layout .parameter-stepper {
    align-items: stretch;
    background: var(--surface-panel);
    border: 1px solid var(--border-control);
    border-radius: 8px;
    box-sizing: border-box;
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr) 44px;
    margin-bottom: 0;
    min-height: 40px;
    min-width: 0;
    overflow: hidden;
    width: 100%;
}

.simulation-layout .parameter-stepper-button {
    align-items: center;
    background: var(--surface-panel);
    border: 0;
    color: var(--text-primary);
    cursor: pointer;
    display: inline-flex;
    font-size: var(--font-size-large);
    font-weight: 800;
    justify-content: center;
    line-height: 1;
    min-width: 0;
    padding: 0;
}

.simulation-layout .parameter-stepper-button:hover,
.simulation-layout .parameter-stepper-button:focus-visible {
    background: var(--surface-panel-subtle);
    color: var(--accent-color);
    outline: none;
}

.simulation-layout .parameter-stepper-decrement {
    border-right: 1px solid var(--border-soft);
}

.simulation-layout .parameter-stepper-increment {
    border-left: 1px solid var(--border-soft);
}

.simulation-layout .parameter-stepper-input {
    -moz-appearance: textfield;
    background: var(--surface-panel);
    border: 0;
    border-radius: 0;
    font-size: var(--font-size-small);
    margin: 0;
    min-height: 100%;
    padding: 0 10px;
    text-align: center;
}

.simulation-layout .parameter-stepper-input::-webkit-inner-spin-button,
.simulation-layout .parameter-stepper-input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.simulation-layout .model-system-group {
    padding-top: var(--simulation-workbench-top-padding);
}

.simulation-layout .binary-choice {
    display: grid;
    gap: var(--simulation-sidebar-control-gap);
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin: 0;
}

.simulation-layout .binary-choice label {
    align-items: center;
    background: var(--surface-panel);
    border: 1px solid var(--border-control);
    border-radius: 8px;
    color: var(--text-primary);
    display: inline-flex;
    font-size: var(--font-size-small);
    font-weight: 800;
    gap: 6px;
    justify-content: center;
    margin: 0;
    min-height: 34px;
    padding: 6px 8px;
}

.simulation-layout .binary-choice input {
    height: 1px;
    margin: 0;
    opacity: 0;
    pointer-events: none;
    position: absolute;
    width: 1px;
}

.simulation-layout .binary-choice label:has(input:checked) {
    background: var(--color-blue-200);
    border-color: var(--color-blue-200);
    color: var(--color-navy-950);
}

.simulation-layout .binary-choice label:has(input:focus-visible) {
    box-shadow: 0 0 0 4px rgba(36, 74, 125, 0.18);
}

.simulation-layout .quiet-gravity-dropdown {
    margin-top: 0;
}

.simulation-layout .integrator-policy-hidden {
    display: none;
}

.simulation-layout .time-group {
    gap: var(--simulation-sidebar-heading-gap);
    padding-bottom: var(--simulation-sidebar-compact-section-padding-y);
    padding-top: var(--simulation-sidebar-compact-section-padding-y);
}

.simulation-layout .slider-control {
    margin: 0;
    min-width: 0;
}

.simulation-layout .initial-state-heading-row {
    align-items: start;
    display: grid;
    gap: 8px;
    grid-template-columns: minmax(0, 1fr) auto;
    margin-bottom: 0;
}

.simulation-layout .initial-state-title {
    margin-bottom: 0;
}

.simulation-layout .initial-state-help {
    display: contents;
}

.simulation-layout .initial-state-help-summary {
    align-items: center;
    background: var(--surface-panel);
    border: 1px solid var(--border-control);
    border-radius: 999px;
    box-sizing: border-box;
    color: var(--text-primary);
    cursor: pointer;
    display: inline-flex;
    font-size: var(--font-size-small);
    font-weight: 800;
    height: 24px;
    justify-content: center;
    list-style: none;
    margin-top: -2px;
    width: 24px;
}

.simulation-layout .initial-state-help-summary::-webkit-details-marker {
    display: none;
}

.simulation-layout .initial-state-help-summary:hover,
.simulation-layout .initial-state-help[open] .initial-state-help-summary {
    background: var(--surface-panel-subtle);
    border-color: var(--link-color);
    color: var(--link-color);
}

.simulation-layout .initial-state-help-panel {
    background: var(--surface-panel);
    border: 1px solid var(--border-soft);
    border-radius: 8px;
    box-shadow: 0 14px 32px rgba(13, 41, 90, 0.16);
    box-sizing: border-box;
    color: var(--text-secondary);
    font-size: var(--font-size-small);
    grid-column: 1 / -1;
    line-height: 1.35;
    padding: 12px;
    width: 100%;
    z-index: 5;
}

.simulation-layout .initial-state-help-panel p {
    margin: 0 0 8px;
}

.simulation-layout .initial-state-help-panel p:last-child {
    margin-bottom: 0;
}

.simulation-layout .initial-state-preset-hidden {
    display: none;
}

.simulation-layout .initial-state-input-grid {
    display: grid;
    column-gap: var(--simulation-sidebar-grid-gap);
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: 0;
}

.simulation-layout .initial-state-input-column {
    display: grid;
    gap: var(--simulation-sidebar-field-gap);
    min-width: 0;
}

.simulation-layout .initial-state-input-label:not(:first-child) {
    margin-top: 8px;
}

.simulation-layout .initial-state-input {
    width: 100%;
}

.simulation-layout .slider-label {
    display: block;
    font-size: var(--font-size-small);
    font-weight: 800;
    margin-bottom: 4px;
}

.simulation-layout .simulation-slider {
    display: grid;
    gap: 4px;
    margin: 0;
    padding: 0;
}

.simulation-layout .simulation-slider .dash-range-slider-input {
    border: 1px solid var(--border-control);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: var(--font-size-xsmall);
    font-weight: 700;
    justify-self: end;
    margin-bottom: 0;
    max-width: 72px;
    order: 2;
    text-align: center;
}

.simulation-layout .time-slider .dash-range-slider-input {
    display: none;
}

.simulation-layout .simulation-slider .dash-slider-wrapper {
    order: 1;
    padding: 0 0 8px;
}

.simulation-layout .simulation-slider .dash-slider-track {
    background-color: var(--color-blue-200);
    height: 5px;
}

.simulation-layout .simulation-slider .dash-slider-range {
    background-color: var(--accent-color);
}

.simulation-layout .simulation-slider .dash-slider-thumb {
    background: var(--surface-panel);
    border: 2px solid var(--accent-color);
    height: 16px;
    width: 16px;
}

.simulation-layout .simulation-slider .dash-slider-thumb:focus-visible,
.simulation-layout .simulation-slider .dash-slider-thumb:hover {
    border-color: var(--accent-hover);
    box-shadow: 0 0 0 4px rgba(36, 74, 125, 0.16);
}

.simulation-layout .simulation-slider .dash-slider-mark {
    color: var(--text-muted);
    font-size: 0.58rem;
    line-height: 1.1;
}

.simulation-layout .simulation-slider .rc-slider-rail {
    background-color: var(--color-blue-200);
    height: 5px;
}

.simulation-layout .simulation-slider .rc-slider-track {
    background-color: var(--accent-color);
    height: 5px;
}

.simulation-layout .simulation-slider .rc-slider-handle {
    border: 2px solid var(--accent-color);
    height: 16px;
    margin-top: -6px;
    width: 16px;
}

.simulation-layout .simulation-slider .rc-slider-handle:focus,
.simulation-layout .simulation-slider .rc-slider-handle:hover {
    border-color: var(--accent-hover);
    box-shadow: 0 0 0 4px rgba(36, 74, 125, 0.16);
}

.simulation-layout .simulation-slider .rc-slider-mark {
    color: var(--text-muted);
    font-size: 0.58rem;
    line-height: 1.1;
}

.simulation-layout .simulation-slider .rc-slider-dot {
    border-color: var(--border-control);
}

.simulation-layout .simulation-slider .rc-slider-dot-active {
    border-color: var(--accent-color);
}

.simulation-layout .time-start-hidden {
    display: none;
}

.simulation-layout .dropdown {
    border-radius: 8px;
    box-sizing: border-box;
    color: var(--text-primary);
    max-width: 100%;
    min-width: 0;
}

.simulation-output-workspace {
    align-items: stretch;
    background: var(--surface-panel);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
    width: 100%;
}

.simulation-interaction-shell {
    background: var(--surface-panel);
    box-sizing: border-box;
    display: grid;
    gap: 28px;
    min-width: 0;
    padding: var(--simulation-output-top-padding) var(--simulation-output-x-padding) 32px;
}

.simulation-summary-diagnostics {
    display: grid;
    gap: 20px;
    grid-template-columns: minmax(220px, 0.9fr) minmax(220px, 1fr) minmax(220px, 1fr);
    min-width: 0;
}

.simulation-detail-diagnostics {
    align-items: start;
}

.simulation-status-message {
    background: var(--surface-panel);
    border: 1px solid var(--border-soft);
    border-left: 5px solid var(--accent-color);
    border-radius: 8px;
    box-sizing: border-box;
    color: var(--text-primary);
    font-size: var(--font-size-medium);
    line-height: 1.45;
    padding: 14px 16px;
}

.simulation-status-success {
    border-left-color: var(--color-success);
}

.simulation-status-stale {
    border-left-color: var(--color-warning);
}

.simulation-status-failed {
    border-left-color: var(--color-danger);
}

.simulation-status-cleared,
.simulation-status-empty {
    border-left-color: var(--text-muted);
}

.simulation-hidden-runtime-targets {
    display: none !important;
}

.simulation-panel {
    background: var(--surface-panel);
    border: 1px solid var(--border-soft);
    border-radius: 8px;
    box-sizing: border-box;
    color: var(--text-primary);
    min-width: 0;
    padding: 16px;
}

.simulation-panel-heading,
.simulation-panel-title {
    color: var(--text-primary);
    letter-spacing: 0;
    margin: 0 0 10px;
}

.simulation-panel-heading {
    font-size: var(--font-size-large);
}

.simulation-panel-title {
    font-size: var(--font-size-medium);
}

.simulation-panel p,
.simulation-panel li {
    color: var(--text-secondary);
    font-size: var(--font-size-small);
    line-height: 1.45;
}

.simulation-panel ul {
    margin: 0;
    padding-left: 18px;
}

.simulation-output-header-row {
    align-items: center;
    display: block;
    margin: 0 0 24px;
    min-width: 0;
}

.simulation-output-header-row .simulation-panel-heading {
    margin: 0;
}

.canvas-workspace-grid {
    display: grid;
    gap: 28px;
    grid-template-areas:
        "motion projection"
        "scrubber scrubber"
        "time time";
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    min-width: 0;
}

.canvas-panel-motion {
    grid-area: motion;
}

.canvas-panel-projection {
    grid-area: projection;
}

.canvas-panel-time {
    grid-area: time;
}

.canvas-time-selector {
    grid-area: scrubber;
}

.canvas-placeholder-panel {
    background: var(--surface-panel);
    border: 0;
    min-width: 0;
    padding: 0;
}

.canvas-placeholder,
.selected-state-readout {
    border-radius: 8px;
    color: var(--text-muted);
    font-size: var(--font-size-small);
    min-height: 86px;
    padding: 14px;
}

.canvas-placeholder {
    background: var(--surface-panel);
    border: 0;
    border-radius: 0;
    min-height: 0;
    padding: 0;
}

.selected-state-readout {
    background: var(--surface-panel-subtle);
    border: 1px solid var(--border-soft);
    border-style: solid;
    line-height: 1.45;
    min-height: auto;
}

.canvas-renderer-panel {
    background: var(--surface-panel);
    border: 0;
    min-height: 0;
    min-width: 0;
    overflow: hidden;
    padding: 0;
}

.simulation-canvas-view {
    display: block;
    width: 100%;
}

.canvas-panel-motion .canvas-renderer-panel,
.canvas-panel-projection .canvas-renderer-panel {
    aspect-ratio: 1 / 1;
}

.canvas-panel-motion .simulation-canvas-view,
.canvas-panel-projection .simulation-canvas-view {
    height: 100%;
}

.canvas-panel-time .simulation-canvas-view {
    height: 300px;
}

.simulation-interaction-shell[data-result-state="stale"] .canvas-renderer-panel {
    border-color: var(--color-warning);
}

.simulation-interaction-shell[data-result-state="failed"] .canvas-renderer-panel,
.simulation-interaction-shell[data-result-state="cleared"] .canvas-renderer-panel,
.simulation-interaction-shell[data-result-state="empty"] .canvas-renderer-panel {
    border-color: var(--border-soft);
}

.playback-shell {
    align-items: stretch;
    background: transparent;
    border: 0;
    border-radius: 0;
    box-sizing: border-box;
    display: grid;
    gap: 14px;
    grid-template-columns: 1fr;
    margin: 0;
    min-width: 0;
    padding: 0;
}

.canvas-playback-panel {
    position: static;
}

.playback-control-row {
    align-items: center;
    display: grid;
    gap: 8px;
    grid-template-columns: auto;
}

.playback-panel-copy {
    display: grid;
    gap: 6px;
    max-width: 920px;
    min-width: 0;
}

.playback-panel-heading {
    margin: 0;
}

.playback-panel-text {
    color: var(--text-secondary);
    font-size: var(--font-size-small);
    font-weight: 650;
    line-height: 1.42;
    margin: 0;
}

.playback-panel-controls-row {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 12px 18px;
    min-width: 0;
}

.playback-button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.playback-button-group .button {
    border-radius: 8px !important;
    flex: 0 0 auto;
    min-width: 64px;
    padding: 8px 12px;
    width: auto;
}

.playback-controls .button:disabled {
    cursor: not-allowed;
    opacity: 0.56;
}

.simulation-frame-indicator {
    background: transparent;
    border: 0;
    border-radius: 0;
    color: var(--text-secondary);
    font-size: var(--font-size-small);
    font-weight: 800;
    min-height: auto;
    padding: 0;
    white-space: nowrap;
}

.scrubber-row {
    align-items: center;
    display: grid;
    gap: 10px;
    margin: 0;
    padding: 0;
}

.simulation-scrubber {
    accent-color: var(--accent-color);
    width: 100%;
}

.simulation-scrubber:disabled {
    opacity: 0.55;
}

.display-options-toggle {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.playback-options-row {
    align-items: center;
    display: flex;
    gap: 12px;
    grid-template-columns: none;
    justify-self: start;
    min-width: 0;
}

.playback-header-status {
    min-width: 0;
}

.playback-header-status .simulation-status-message {
    font-size: var(--font-size-small);
    line-height: 1.35;
    padding: 8px 10px;
}

.display-options-toggle label {
    align-items: center;
    color: var(--text-primary);
    display: inline-flex;
    font-size: var(--font-size-small);
    gap: 6px;
    margin-right: 0;
}

.display-options-toggle input {
    accent-color: var(--accent-color);
}

.canvas-inspection-workspace {
    border: 0;
    padding: 0;
}

.simulation-diagnostics-toggle {
    display: grid;
    grid-column: 1 / -1;
    justify-items: end;
    margin-top: -2px;
    min-width: 0;
}

.simulation-diagnostics-summary {
    background: var(--surface-panel);
    border: 1px solid var(--border-control);
    border-radius: 8px;
    box-sizing: border-box;
    color: var(--text-primary);
    cursor: pointer;
    font-size: var(--font-size-small);
    font-weight: 800;
    list-style: none;
    min-height: 34px;
    padding: 8px 12px;
    text-align: center;
    white-space: nowrap;
}

.simulation-diagnostics-summary::-webkit-details-marker {
    display: none;
}

.simulation-diagnostics-summary:hover {
    background: var(--surface-panel-subtle);
    border-color: var(--link-color);
    color: var(--link-color);
}

.simulation-diagnostics-toggle[open] .simulation-diagnostics-summary {
    background: var(--surface-panel-subtle);
    border-color: var(--link-color);
    color: var(--link-color);
}

.simulation-diagnostics-toggle .simulation-summary-diagnostics {
    background: var(--surface-panel);
    border-top: 1px solid var(--border-soft);
    margin-top: 2px;
    padding: 14px;
    width: 100%;
}

.simulation-layout .graph-section {
    align-items: center;
    background: var(--surface-panel);
    box-sizing: border-box;
    flex: 1;
    justify-content: center;
    min-height: 520px;
    padding: 28px;
    width: 100%;
}

.simulation-layout .above-graph-container {
    background: var(--surface-panel);
    gap: 28px;
}

.simulation-layout .graph-wrapper {
    background: var(--surface-panel);
}

.simulation-layout .time-graph-section {
    background: var(--surface-panel);
    border-top: 1px solid var(--border-soft);
    padding: 28px;
}

.simulation-layout .graph-container {
    border: 1px solid var(--border-soft);
    box-shadow: 0 18px 45px rgba(4, 24, 67, 0.08);
}

.simulation-layout .graph-title {
    color: var(--text-primary);
    padding: 14px 0 6px;
}

.simulation-layout .run-simulation-button {
    background-color: var(--color-blue-600);
    border: 1px solid var(--color-navy-950);
    border-radius: 8px !important;
    color: var(--text-on-dark);
    font-size: var(--font-size-medium);
    font-weight: 800;
    height: auto;
    letter-spacing: 0;
    margin: 0;
    padding: 11px 14px;
    transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
    width: 100%;
}

.simulation-layout .run-simulation-button:hover {
    background-color: var(--color-blue-600);
    border-color: var(--color-navy-950);
    box-shadow: inset 0 0 0 9999px rgba(255, 255, 255, 0.12), 0 8px 18px rgba(4, 24, 67, 0.14);
    color: var(--text-on-dark);
}

.simulation-layout .run-simulation-button:focus-visible {
    background-color: var(--color-blue-600);
    border-color: var(--color-navy-950);
    box-shadow: 0 0 0 3px rgba(197, 217, 242, 0.85), 0 8px 18px rgba(4, 24, 67, 0.18);
    color: var(--text-on-dark);
    outline: none;
}

.simulation-run-validation-message {
    background: transparent;
    border: 0;
    border-left: 3px solid var(--text-muted);
    border-radius: 0;
    color: var(--text-primary);
    font-size: var(--font-size-small);
    line-height: 1.35;
    padding: 2px 0 2px 10px;
}

.simulation-run-validation-ready {
    border-left-color: var(--text-muted);
}

.simulation-run-validation-success {
    border-left-color: var(--color-success);
}

.simulation-run-validation-stale {
    border-left-color: var(--color-warning);
}

.simulation-run-validation-invalid,
.simulation-run-validation-failed {
    border-left-color: var(--color-danger);
}

.simulation-run-validation-cleared,
.simulation-run-validation-empty {
    border-left-color: var(--text-muted);
}

/* ==========================================================================
   08. Chaos page
   ========================================================================== */

.chaos-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh; /* Full viewport height */
  background-color: var(--surface-page);
}

.body-chaos {
    flex: none;
}

.chaos-content-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
  width: 100%;
  margin: 0;
}

.chaos-text {
  color: var(--text-primary);
  font-family: var(--font-family-sans);
  text-align: center; /* Center text within its container */
  font-size: var(--font-size-xlarge);
}

/* ==========================================================================
   09. 404 page
   ========================================================================== */

.not-found-page {
    background: var(--surface-dark);
    color: var(--text-on-dark);
    min-height: 100vh;
}

.not-found-hero-inner {
    align-items: center;
    display: flex;
    justify-content: center;
}

.not-found-hero,
.not-found-hero .home-hero-inner {
    min-height: 100vh;
}

.not-found-panel {
    max-width: min(860px, calc(100vw - 40px));
    padding: clamp(20px, 4vw, 40px);
    text-align: left;
    width: max-content;
}

.not-found-haiku {
    margin: 0 0 28px;
}

.not-found-haiku-line {
    color: var(--text-on-dark);
    font-size: clamp(1.65rem, 2.6vw, 2.85rem);
    font-weight: 800;
    line-height: 1.22;
    margin: 0;
    white-space: nowrap;
}

.not-found-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.not-found-link {
    border: 1px solid rgba(215, 230, 244, 0.32);
    border-radius: 8px;
    color: var(--text-on-dark);
    font-weight: 800;
    line-height: 1.2;
    padding: 11px 14px;
    text-decoration: none;
}

.not-found-link:hover,
.not-found-link-primary {
    background: rgba(215, 230, 244, 0.12);
    color: var(--text-on-dark);
    text-decoration: none;
}

.not-found-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh; /* Full viewport height */
  background-color: var(--surface-page);
}

.not-found-content-container {
  flex-grow: 1; /* Take up remaining space */
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 8px 16px; /* Ensure padding is consistent */
  background-color: var(--surface-panel-subtle);
  margin: 10px 0; /* Add top and bottom margin */
}

.custom-text {
  color: var(--text-primary);
  font-family: var(--font-family-sans);
}

/* ==========================================================================
   10. Utilities
   ========================================================================== */

@keyframes delayedVisibility {
  0% {
    visibility: hidden;
  }
  99% {
    visibility: hidden;
  }
  100% {
    visibility: visible;
  }
}

.delayed-spinner {
    animation: delayedVisibility 0.25s forwards;
}

/* ==========================================================================
   11. Responsive rules
   ========================================================================== */

@media (max-width: 1180px) {
    .simulation-output-header-row {
        grid-template-columns: 1fr;
    }

    .playback-shell {
        grid-template-columns: 1fr;
    }

    .simulation-diagnostics-toggle {
        justify-items: start;
    }

    .playback-control-row {
        grid-template-columns: auto;
    }

    .playback-options-row {
        justify-self: start;
    }
}

@media (max-width: 980px) {
    .canvas-workspace-grid {
        grid-template-areas:
            "motion"
            "projection"
            "scrubber"
            "time";
    }

    .canvas-workspace-grid,
    .simulation-summary-diagnostics {
        grid-template-columns: 1fr;
    }

    .canvas-panel-time .simulation-canvas-view {
        height: 260px;
    }

    .playback-control-row,
    .playback-options-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 2200px) {
    :root {
        font-size: 100% !important;
    }
}

@media (max-width: 1680px) {
    /* Make the children of the above-graph-container stack vertically */
    .above-graph-container {
        flex-direction: column; /* Stack the children vertically */
        align-items: center; /* Optionally center the stacked items */
        padding-top: 18px;
        gap: 18px;
    }
}

@media (max-width: 1500px) {
    :root {
        font-size: 90% !important;
    }
}

@media (max-width: 1200px) {
    .home-hero-inner {
        grid-template-areas:
            "copy"
            "explore"
            "lower";
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }

    .home-explore-panel {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        margin-top: 0;
    }

    .home-explore-heading {
        grid-column: 1 / -1;
    }

    .home-lower-left {
        align-self: start;
        margin-top: clamp(28px, 5vh, 56px);
    }

}

@media (max-width: 900px) {
    :root {
        font-size: 85% !important;
    }

    .equations-layout {
        --equations-document-width: calc(100% - clamp(24px, 8vw, 72px));
    }

    .site-nav-menu {
        display: block;
    }

    .site-brand {
        white-space: normal;
    }

    .home-hero-inner {
        min-height: auto;
        padding-bottom: 48px;
        padding-top: 48px;
    }

    .home-explore-panel {
        display: flex;
    }

    .equations-page {
        padding: 40px;
    }

    .equations-model-grid,
    .equations-branch-grid {
        grid-template-columns: 1fr;
    }

    .equations-model-card {
        min-height: auto;
    }

    .equations-model-image-wrap {
        min-height: 280px;
    }

    .equations-model-image {
        height: clamp(260px, 58vw, 340px);
    }

    /* The input bar should be horizontal */
    .content-container {
        flex-direction: column; /* Stack children vertically */
        justify-content: center; /* Center the stacked items vertically */
        align-items: center; /* Center the stacked items horizontally */
        width: 100%; /* Ensure full width for each child */
        height: auto;
        padding: 0;
        margin: 0;
        box-sizing: border-box;
    }

    .side-bar {
        flex-direction: row; /* Arrange children horizontally */
        justify-content: space-around; /* Space children evenly */
        align-items: center; /* Center children vertically */
        max-width: 100%; /* Sidebar should take up full width */
        height: auto;
        padding: 0 !important;
        box-sizing: border-box;
    }

    /* Inputs container to arrange input-groups in a row */
    .inputs {
        flex: 1;
        display: flex; /* Keep flexbox layout */
        flex-direction: row; /* Change direction to row to arrange children horizontally */
        justify-content: space-between; /* Evenly distribute space between children */
        align-items: stretch; /* Align children to the top */
        max-width: 100%; /* Take full width of the parent */
    }

    .input-group {
        flex: 1; /* Allow input groups to grow/shrink equally */
        box-sizing: border-box; /* Include padding/margin in width calculations */
        display: flex;
        flex-direction: column; /* Ensure content inside the input groups stacks properly */
        align-items: stretch;
        width: 100%;
        padding: 36px 36px; /* Apply padding to each input group */
    }

    /* Ensure the model-system-group takes up the full height */
    .input-group .model-system-group,
    .input-group .initial-conditions-group {
        flex-grow: 1; /* Allow this group to grow and fill available space */
        height: 100%; /* Ensure it takes the full height available */
    }

        /* Dropdowns within input-groups */
    .input-group .dropdown {
        width: 100%; /* Ensure dropdowns take full width */
        max-width: 100%; /* Prevent them from exceeding container width */
        flex-grow: 1; /* Allow dropdowns to grow */
    }

    /* Graph Section */
    .graph-section {
        flex-direction: row; /* Set flex direction to row */
        justify-content: center; /* Distribute space evenly between graph elements */
        align-items: center; /* Center items vertically */
        width: 100%; /* Ensure it occupies full width when stacked */
        margin: 0; /* Remove any margin */
        padding: 0; /* Remove padding */
        box-sizing: border-box;
    }

     /*Make the children of the above-graph-container side by side */
    .above-graph-container {
        flex-direction: column;
        align-items: center;
        padding-top: 36px;
        gap: 40px;
        box-sizing: border-box;
    }
}

@media (max-width: 650px) {
    :root {
        font-size: 65% !important;
    }

    .site-nav {
        padding: 0 16px;
    }

    .equations-layout .site-nav {
        padding-left: 16px;
        padding-right: 16px;
        width: 100%;
    }

    .site-nav-panel {
        min-width: min(280px, calc(100vw - 32px));
    }

    .home-hero-inner {
        padding-left: 20px;
        padding-right: 20px;
    }

    .home-hero-title {
        font-size: 3.6rem;
    }

    .home-explore-link {
        gap: 12px;
    }

    .home-explore-number {
        flex-basis: 34px;
    }

    .equations-page {
        border-left: 0;
        border-right: 0;
        padding-left: 20px;
        padding-right: 20px;
        width: 100%;
    }

    .equations-hero-copy {
        padding: 24px;
    }

    .equations-hero-title {
        font-size: 2.4rem;
    }

    .equations-section-title {
        font-size: 1.65rem;
    }

    .equations-section,
    .equations-branching {
        padding-top: 32px;
    }

    .equations-model-card,
    .equations-branch-card {
        padding: 18px;
    }

    .equations-block {
        padding-bottom: 24px;
    }

    .equations-model-image-wrap {
        min-height: 240px;
    }

    .equations-model-image {
        height: clamp(240px, 72vw, 320px);
    }

    .not-found-actions {
        flex-direction: column;
    }
}

@media (max-width: 1440px) {
    .simulation-layout {
        --sidebar-width: clamp(360px, 28vw, 400px);
        --sidebar-x-padding: 24px;
        --simulation-workbench-gutter: clamp(12px, 2vw, 24px);
        --simulation-output-x-padding: 24px;
    }

    .simulation-interaction-shell,
    .canvas-workspace-grid {
        gap: 24px;
    }
}

@media (max-width: 1120px) {
    .simulation-workspace {
        padding-bottom: 0;
        padding-top: 0;
    }

    .simulation-workspace-primary {
        align-items: stretch;
        grid-template-columns: 1fr;
    }

    .simulation-layout .side-bar {
        align-self: stretch;
        border-bottom: 0;
        border-right: 0;
        height: auto;
        max-height: none;
        overflow: visible;
        position: static;
        top: auto;
        width: 100%;
    }

    .simulation-layout .inputs {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0 var(--simulation-sidebar-grid-gap);
        height: auto;
        min-height: 0;
        overflow: visible;
    }

    .simulation-layout .simulation-config-column {
        display: flex;
        flex-direction: column;
        min-width: 0;
    }

    .simulation-layout .simulation-config-system-column {
        grid-column: 1;
    }

    .simulation-layout .simulation-config-state-column {
        grid-column: 2;
    }

    .simulation-layout .simulation-config-column .input-group {
        padding-left: var(--sidebar-x-padding);
        padding-right: var(--sidebar-x-padding);
    }

    .simulation-layout .simulation-config-column .input-group + .input-group {
        padding-top: var(--simulation-sidebar-compact-section-padding-y);
    }

    .simulation-layout .run-group {
        grid-column: 1 / -1;
        justify-self: stretch;
        margin-top: 0;
        position: static;
        width: 100%;
    }

    .simulation-output-workspace {
        min-width: 0;
    }

    .simulation-summary-diagnostics {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .simulation-workspace {
        padding: 0 20px 0;
    }

    .simulation-workspace-primary.content-container {
        align-items: stretch;
        display: grid;
        grid-template-columns: 1fr;
        justify-content: stretch;
    }

    .simulation-layout .side-bar {
        align-items: stretch;
        display: flex;
        flex-direction: column;
        max-width: none;
        width: 100%;
    }

    .simulation-layout .inputs {
        align-items: stretch;
        display: grid;
        flex-direction: column;
        justify-content: flex-start;
        padding: 0;
    }

    .simulation-layout .input-group {
        padding: 20px;
        width: 100%;
    }

    .simulation-layout .simulation-config-column .input-group {
        padding-left: 20px;
        padding-right: 20px;
    }

    .simulation-layout .model-system-group {
        padding-top: 20px;
    }

    .simulation-layout .graph-section {
        min-height: 420px;
        padding: 20px;
    }

    .simulation-layout .time-graph-section {
        padding: 20px;
    }

    .simulation-interaction-shell {
        gap: 22px;
        padding: 20px;
    }

    .simulation-output-header-row {
        margin: 0 0 22px;
    }

    .playback-shell {
        padding: 0;
    }

    .canvas-workspace-grid {
        gap: 22px;
    }
}

@media (max-width: 760px) {
    .simulation-layout .site-nav {
        padding-left: 16px;
        padding-right: 16px;
    }

    .simulation-workspace {
        padding: 0;
    }

    .simulation-workspace-primary {
        border-left: 0;
        border-right: 0;
        box-shadow: none;
        min-height: var(--app-content-height);
        overflow: hidden;
    }

    .simulation-layout .inputs {
        grid-template-columns: 1fr;
    }

    .simulation-layout .simulation-config-system-column,
    .simulation-layout .simulation-config-state-column,
    .simulation-layout .run-group {
        grid-column: 1;
    }

    .simulation-layout .run-group {
        max-width: none;
    }

    .simulation-layout .graph-section,
    .simulation-layout .time-graph-section {
        padding: 16px;
    }

    .simulation-layout .input-group,
    .simulation-layout .model-system-group {
        padding-top: 16px;
    }

    .simulation-interaction-shell {
        gap: 18px;
        padding: 16px;
    }

    .simulation-output-header-row {
        margin: 0 0 18px;
    }

    .canvas-workspace-grid {
        grid-template-areas:
            "motion"
            "projection"
            "scrubber"
            "time";
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .playback-shell {
        padding: 0;
    }

    .simulation-layout .split-inputs {
        flex-direction: column;
        gap: var(--simulation-sidebar-internal-gap);
    }

    .simulation-layout .initial-state-input-grid {
        grid-template-columns: 1fr;
        row-gap: var(--simulation-sidebar-internal-gap);
    }

}