/* --- Special Relativity simulation page styles (loaded after simulation_styles.css) --- */

.relativity-sim {
    --rel-btn-h: 34px;
}

@media (pointer: coarse) {
    .relativity-sim {
        --rel-btn-h: 40px;
    }
}

/* The canvas only takes taps (to ride along with a craft), so swipes on it scroll the page. */
#simulationCanvas {
    touch-action: manipulation;
}

#simulationCanvas.rel-can-click {
    cursor: pointer;
}

/* ---------- Main controls under the canvas: the frame switch and the speed slider ----------
   One row on wide screens; on phones the slider gets a row of its own. */
.rel-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 20px;
    margin-top: 0.5em;
    padding: 5px 12px 5px 6px;
    box-sizing: border-box;
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--sim-radius, 6px);
    font-size: 0.85em;
    line-height: 1.3;
}

.rel-toolbar-label {
    flex: 0 0 auto;
    font-weight: 300;
    white-space: nowrap;
    color: var(--color-text);
}

.rel-frame {
    display: flex;
    align-items: center;
    gap: 0.6em;
    flex: 0 0 auto;
}

/* Station / Ship: a segmented switch that shows which frame is on */
.rel-seg {
    display: flex;
    border-radius: 4px;
    box-shadow: inset 0 0 0 1px var(--color-border);
}

.rel-toolbar .rel-frame-btn {
    -webkit-appearance: none;
    appearance: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45em;
    flex: 1 1 0;
    height: var(--rel-btn-h);
    min-width: 0;
    margin: 0;
    padding: 0 0.9em;
    font-size: 0.95em;
    font-weight: 700;
    letter-spacing: 0.04em;
    line-height: 1;
    text-transform: none;
    white-space: nowrap;
    color: var(--color-text) !important;
    background-color: transparent;
    border-radius: 0;
    box-shadow: none;
    -webkit-tap-highlight-color: transparent;
}

.rel-toolbar .rel-frame-btn:first-child {
    border-radius: 4px 0 0 4px;
}

.rel-toolbar .rel-frame-btn:last-child {
    border-radius: 0 4px 4px 0;
}

.rel-toolbar .rel-frame-btn .icon:before {
    line-height: 1;
}

.rel-toolbar .rel-frame-btn[aria-checked="true"] {
    background-color: var(--color-accent);
    color: #ffffff !important;
}

@media (hover: hover) {
    .rel-toolbar .rel-frame-btn:hover {
        box-shadow: inset 0 0 0 1px var(--color-accent);
    }

    .rel-toolbar .rel-frame-btn[aria-checked="true"]:hover {
        background-color: var(--color-accent-active);
        box-shadow: none;
    }
}

.rel-toolbar .rel-frame-btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 1px;
}

/* Speed: label, slider, value */
.rel-toolbar .rel-velocity {
    display: flex;
    align-items: center;
    gap: 0.8em;
    flex: 1 1 18em;
    min-width: 0;
    margin: 0;
    font-size: 1em;
    font-weight: 400;
}

.rel-velocity-value {
    flex: 0 0 auto;
    font-size: 1.1em;
    white-space: nowrap;
    color: var(--sim-value-color);
}

.rel-velocity-value .sim-value {
    font-weight: 700;
}

.rel-velocity-value em {
    font-weight: 400;
}

/* The slider looks like the ones in the settings panel (simulation_styles.css), a little bolder. */
.rel-velocity input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    display: block;
    flex: 1 1 auto;
    min-width: 6em;
    height: var(--rel-btn-h);
    margin: 0;
    padding: 0;
    background: transparent;
    outline: none;
    cursor: pointer;
}

.rel-velocity input[type="range"]::-webkit-slider-runnable-track {
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(to right, var(--color-accent) 0 var(--rel-fill, 0%), var(--sim-track) var(--rel-fill, 0%) 100%);
}

.rel-velocity input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    margin-top: -7px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 2px solid var(--color-bg-alt);
    box-shadow: 0 0 0 1px var(--color-accent);
    transition: transform 0.1s ease;
}

.rel-velocity input[type="range"]::-moz-range-track {
    height: 6px;
    border-radius: 3px;
    background: var(--sim-track);
}

.rel-velocity input[type="range"]::-moz-range-progress {
    height: 6px;
    border-radius: 3px;
    background: var(--color-accent);
}

.rel-velocity input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 2px solid var(--color-bg-alt);
    box-shadow: 0 0 0 1px var(--color-accent);
}

.rel-velocity input[type="range"]:active::-webkit-slider-thumb {
    transform: scale(1.15);
}

.rel-velocity input[type="range"]:focus-visible::-webkit-slider-thumb {
    box-shadow: 0 0 0 2px var(--color-bg-alt), 0 0 0 4px var(--color-accent);
}

.rel-velocity input[type="range"]:focus-visible::-moz-range-thumb {
    box-shadow: 0 0 0 2px var(--color-bg-alt), 0 0 0 4px var(--color-accent);
}

@media (pointer: coarse) {
    .rel-velocity input[type="range"]::-webkit-slider-thumb {
        width: 26px;
        height: 26px;
        margin-top: -10px;
    }

    .rel-velocity input[type="range"]::-moz-range-thumb {
        width: 22px;
        height: 22px;
    }
}

/* Phones: the frame switch fills the first row, the slider the second */
@media (max-width: 600px) {
    .rel-toolbar {
        padding: 5px 8px 5px 6px;
        gap: 4px 12px;
    }

    .rel-frame {
        flex: 1 1 100%;
    }

    .rel-seg {
        flex: 1 1 auto;
    }

    .rel-toolbar .rel-velocity {
        flex: 1 1 100%;
        padding-left: 2px;
    }
}

/* ---------- Short landscape screens (phones held sideways): the controls in a column beside the canvas ----------
   A row under the canvas would cost it a third of the screen's height. The column has a fixed width, so the
   display container is made that much wider than the canvas (which the shared layout sizes from the height). */
@media (orientation: landscape) and (max-height: 540px) {
    .relativity-sim {
        --rel-side-w: 138px;
        --rel-side-gap: 8px;
    }

    .relativity-sim .simulation-display-container {
        display: grid;
        grid-template-columns: var(--rel-side-w) minmax(0, 1fr);
        grid-template-areas: "tools canvas" "info info";
        column-gap: var(--rel-side-gap);
        width: min(100%, calc(var(--sim-canvas-max-h) * (var(--aspect-ratio, 2 / 1)) + 2px + var(--rel-side-w) + var(--rel-side-gap)));
    }

    .relativity-sim .sim-canvas-wrapper {
        grid-area: canvas;
        min-width: 0;
    }

    .relativity-sim .sim-info-bar {
        grid-area: info;
    }

    .rel-toolbar {
        grid-area: tools;
        flex-direction: column;
        flex-wrap: nowrap;
        align-items: stretch;
        align-self: start;
        gap: 10px;
        margin-top: 0;
        padding: 8px;
    }

    .rel-frame {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
    }

    .rel-seg {
        flex-direction: column;
    }

    .rel-toolbar .rel-frame-btn {
        flex: 0 0 auto;
        justify-content: flex-start;
        padding: 0 0.7em;
    }

    .rel-toolbar .rel-frame-btn:first-child {
        border-radius: 4px 4px 0 0;
    }

    .rel-toolbar .rel-frame-btn:last-child {
        border-radius: 0 0 4px 4px;
    }

    /* "Speed  0.80 c" over the slider */
    .rel-toolbar .rel-velocity {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto;
        grid-template-areas: "label value" "slider slider";
        align-items: center;
        gap: 2px 6px;
        flex: 0 0 auto;
    }

    .rel-velocity .rel-toolbar-label {
        grid-area: label;
    }

    .rel-velocity-value {
        grid-area: value;
    }

    .rel-velocity input[type="range"] {
        grid-area: slider;
        width: 100%;
        min-width: 0;
    }

    /* Fullscreen: the grid fills the space above the fixed info bar */
    body.sim-fullscreen-active .relativity-sim .simulation-display-container {
        display: grid;
        grid-template-rows: minmax(0, 1fr);
        grid-template-areas: "tools canvas";
        width: 100%;
    }

    body.sim-fullscreen-active .relativity-sim .sim-canvas-wrapper {
        height: 100%;
    }
}

/* ---------- Info bar: a colour key in front of each clock ---------- */
.rel-dot {
    display: inline-block;
    width: 0.6em;
    height: 0.6em;
    margin-right: 0.4em;
    border-radius: 50%;
    vertical-align: 0.05em;
    background-color: currentColor;
}

/* The narrowest phones (320 px): slightly smaller readouts, so "Station's probe: 0.50 c" and the like stay on
   one line in the two-column grid. */
@media screen and (max-width: 360px) {
    .relativity-sim .stats-box {
        font-size: 0.72em;
        padding: 0.3em 0.4em;
    }
}

/* ---------- Settings panel ---------- */
.sim-controls-content .rel-hint {
    font-size: 0.8em;
    opacity: 0.75;
}