/* Site-wide styles. Homepage-only styles are in 2_home.css */

:root {
    --wp-ink: #1b2333;
    --wp-muted: #5a6478;
    --wp-rule: #dde3ee;
    --wp-surface: #f4f7fc;
    --wp-brand: #307cff;
    --wp-link: #1f5fd6;  /* brand blue darkened for 4.5:1 text contrast */
    --wp-link-hover: #184ba8;
}

html {
    font-size: 15px;
}

body {
    color: var(--wp-ink);
    font-family: 'Atkinson Hyperlegible', system-ui, sans-serif;
}

a {
    color: var(--wp-link);
}

/* Navbar */

.site-navbar {
    background: #fff;
    border-bottom: 1px solid var(--wp-rule);
    padding-top: 0.4rem;
    padding-bottom: 0.4rem;
}

.site-navbar .site-brand {
    color: var(--wp-ink);
    font-weight: 700;
    font-size: 1.3rem;
    letter-spacing: -0.01em;
    margin-right: 2rem;
}

.site-navbar .site-nav-link {
    color: var(--wp-muted);
    padding-left: 0.75rem;
    padding-right: 0.75rem;
}

.site-navbar .site-nav-link:hover,
.site-navbar .site-nav-link:focus-visible {
    color: var(--wp-ink);
}

.site-navbar .site-nav-link.active {
    color: var(--wp-ink);
    font-weight: 700;
    box-shadow: inset 0 -2px 0 var(--wp-brand);
}

.site-navbar .site-nav-link .fa-solid,
.site-navbar .site-nav-link .fab {
    margin-right: 0.15rem;
}

@media (max-width: 991.98px) {
    /* Collapsed menu: stacked links, active one marked on the left */
    .site-navbar .site-nav-link.active {
        box-shadow: inset 2px 0 0 var(--wp-brand);
    }
}

/* Tool pages: plot left, controls right */

.tool-page {
    padding-top: 1rem;
}

.plot_area {
    width: 100%;
    aspect-ratio: 7 / 6;
    /* Never taller than the screen, so the whole plot is visible */
    max-height: calc(100vh - 5rem);
}

@media (min-width: 992px) {
    /* Plot stays in view while the controls beside it scroll */
    .plot-col {
        position: sticky;
        top: 1rem;
        align-self: flex-start;
    }
}

.controls-col {
    padding-bottom: 1rem;
}

.panel-heading {
    margin: 1.5rem 0 1rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--wp-rule);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--wp-ink);
    text-align: left;
}

.controls-col .input-group-text {
    background: var(--wp-surface);
    border-color: var(--wp-rule);
    color: var(--wp-ink);
}

.controls-col .form-control,
.controls-col .form-select {
    border-color: var(--wp-rule);
}

.btn-primary {
    background-color: var(--wp-link);
    border-color: var(--wp-link);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background-color: var(--wp-link-hover);
    border-color: var(--wp-link-hover);
}

/* Options panel: main settings, then a collapsible section */

.controls-col .control {
    margin-bottom: 0.9rem;
}

.controls-col .control > .btn {
    width: 100%;
}

.panel-intro {
    margin: -0.4rem 0 1rem;
    color: var(--wp-muted);
}

.panel-details {
    margin-top: 1.25rem;
    border-top: 1px solid var(--wp-rule);
}

.panel-summary {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 0;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--wp-ink);
    cursor: pointer;
    list-style: none;
}

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

/* Chevron that turns when the section opens */
.panel-summary::before {
    content: '';
    width: 0.5em;
    height: 0.5em;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(-45deg);
    transition: transform 150ms ease;
}

.panel-details[open] > .panel-summary::before {
    transform: rotate(45deg);
}

.panel-summary:hover {
    color: var(--wp-link);
}

.panel-summary:focus-visible {
    outline: 3px solid var(--wp-brand);
    outline-offset: 2px;
}

.panel-details-body {
    padding-top: 0.25rem;
}

@media (prefers-reduced-motion: reduce) {
    .panel-summary::before {
        transition: none;
    }
}

/* Footer, at the end of every page */

.site-footer {
    margin-top: 3rem;
    padding: 1.25rem 24px 2rem;
    border-top: 1px solid var(--wp-rule);
    color: var(--wp-muted);
    font-size: 0.95rem;
    text-align: center;
}

/* Maths symbols in input labels, e.g. the harmonic oscillator parameters.
   STIX Two is loaded in app.py and positions combining accents (the tilde
   in wavenumber) correctly, unlike most UI fonts */
.math-symbol {
    min-width: 2.75em;
    justify-content: center;
    font-family: 'STIX Two Text', 'Cambria Math', 'Times New Roman', serif;
    font-style: italic;
    font-size: 1.2rem;
}

/* Tilde drawn over a letter (e.g. wavenumber), positioned with CSS rather
   than a combining accent so it sits correctly whatever font is in use */
.tilde {
    position: relative;
    display: inline-block;
}

.tilde::after {
    content: '~';
    position: absolute;
    left: 50%;
    top: -0.42em;
    transform: translateX(-46%);
    font-style: normal;
    font-size: 0.9em;
    line-height: 1;
}

/* Units after an input, equal width so the inputs line up */
.unit-label {
    min-width: 5.75em;
    justify-content: center;
}