/*
 * Stickybear Math page. Laid out for iPad first:
 *   landscape: screen on the left, tall keypad on the right
 *   portrait:  screen on top, wide keypad underneath
 * On laptops (or whenever the keypad is hidden) the screen takes the space
 * and a keyboard hint sits under it.
 */

:root {
    --bg: #f4ecd8;
    --bg-2: #fbf6ea;
    --ink: #2b2238;
    --ink-soft: #6b6070;
    --panel: #e8dcc0;
    --bezel-1: #ded4b8;
    --bezel-2: #c5ba97;
    --key: #fffdf7;
    --key-edge: #d3c5a0;
    --ret: #2e9e4f;
    --ret-edge: #1f7438;
    --back: #ef8a22;
    --back-edge: #b6620e;
    --fn: #4a86d8;
    --fn-edge: #2f62a8;
    --toggle: #8a63d2;
    --toggle-edge: #6243a6;

    --pad: 12px;
    --gap: 12px;
    --top-h: 52px;
    --bezel-pad: clamp(8px, 1.6vmin, 18px);
    --ratio: 1.4231; /* 592 / 416, the apple2js screen with its border */
    --dock-w: clamp(240px, 26vw, 340px);
    --dock-min: clamp(220px, 30vh, 360px);
    --hint-h: 0px;
    --vh: 100vh;
    --sa-t: env(safe-area-inset-top, 0px);
    --sa-r: env(safe-area-inset-right, 0px);
    --sa-b: env(safe-area-inset-bottom, 0px);
    --sa-l: env(safe-area-inset-left, 0px);
}

@supports (height: 100dvh) {
    :root {
        --vh: 100dvh;
    }
}

[data-keypad='hidden'] {
    --hint-h: 40px;
}

html,
body {
    margin: 0;
    height: 100%;
    overflow: hidden;
    overscroll-behavior: none;
    background: var(--bg);
}

body {
    position: fixed;
    inset: 0;
    color: var(--ink);
    font-family:
        ui-rounded, 'SF Pro Rounded', system-ui, -apple-system, 'Segoe UI',
        Roboto, sans-serif;
    background: radial-gradient(
            ellipse at 30% 0%,
            var(--bg-2) 0%,
            transparent 60%
        ),
        var(--bg);
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
    -webkit-text-size-adjust: 100%;
    touch-action: manipulation;
}

/* ---------- Layout ---------- */

.app {
    box-sizing: border-box;
    height: var(--vh);
    padding: calc(var(--pad) + var(--sa-t)) calc(var(--pad) + var(--sa-r))
        calc(var(--pad) + var(--sa-b)) calc(var(--pad) + var(--sa-l));
    display: grid;
    gap: var(--gap);
    grid-template-columns: minmax(0, 1fr) var(--dock-w);
    grid-template-rows: var(--top-h) minmax(0, 1fr);
    grid-template-areas:
        'top top'
        'stage dock';
}

.crt {
    --avail-w: calc(
        100vw - var(--dock-w) - var(--gap) - 2 * var(--pad) - var(--sa-l) -
            var(--sa-r) - 2 * var(--bezel-pad)
    );
    --avail-h: calc(
        var(--vh) - var(--top-h) - var(--gap) - 2 * var(--pad) - var(--sa-t) -
            var(--sa-b) - 2 * var(--bezel-pad) - var(--hint-h)
    );
    width: min(var(--avail-w), var(--avail-h) * var(--ratio));
    aspect-ratio: 592 / 416;
}

[data-keypad='hidden'] .app {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
        'top'
        'stage';
}

[data-keypad='hidden'] .dock {
    display: none;
}

[data-keypad='hidden'] .crt {
    --avail-w: calc(
        100vw - 2 * var(--pad) - var(--sa-l) - var(--sa-r) - 2 *
            var(--bezel-pad)
    );
}

@media (orientation: portrait) {
    .app {
        grid-template-columns: minmax(0, 1fr);
        grid-template-rows: var(--top-h) auto minmax(var(--dock-min), 1fr);
        grid-template-areas:
            'top'
            'stage'
            'dock';
    }

    .crt {
        --avail-w: calc(
            100vw - 2 * var(--pad) - var(--sa-l) - var(--sa-r) - 2 *
                var(--bezel-pad)
        );
        --avail-h: calc(
            var(--vh) - var(--top-h) - 2 * var(--gap) - var(--dock-min) - 2 *
                var(--pad) - var(--sa-t) - var(--sa-b) - 2 * var(--bezel-pad)
        );
    }

    [data-keypad='hidden'] .app {
        grid-template-rows: var(--top-h) minmax(0, 1fr);
    }

    [data-keypad='hidden'] .crt {
        --avail-h: calc(
            var(--vh) - var(--top-h) - var(--gap) - 2 * var(--pad) -
                var(--sa-t) - var(--sa-b) - 2 * var(--bezel-pad) -
                var(--hint-h)
        );
    }
}

/* ---------- Top bar ---------- */

.topbar {
    grid-area: top;
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.title {
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.28em;
    min-width: 0;
    font-size: clamp(22px, 3.4vmin, 32px);
    font-weight: 900;
    white-space: nowrap;
}

.title-sticky {
    color: #1f5fd1;
}

.title-math {
    color: #e0412f;
}

.title-star {
    width: 1em;
    height: 1em;
    fill: #ffcf33;
    stroke: #b98a00;
    stroke-width: 1.2;
    stroke-linejoin: round;
}

.drive-led {
    flex: none;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #6b2a22;
    box-shadow: inset 0 1px 2px rgb(0 0 0 / 50%);
}

.drive-led.on {
    background: #ff3b2f;
    box-shadow: 0 0 8px 2px rgb(255 59 47 / 70%);
}

.tools {
    margin-left: auto;
    display: flex;
    gap: 10px;
}

.tool {
    width: 44px;
    height: 44px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    display: grid;
    place-items: center;
    color: var(--ink);
    background: var(--bg-2);
    box-shadow:
        0 3px 0 var(--key-edge),
        0 5px 10px rgb(60 40 10 / 12%);
    cursor: pointer;
}

.tool[hidden] {
    display: none;
}

.tool svg {
    width: 24px;
    height: 24px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.tool:active {
    transform: translateY(3px);
    box-shadow: 0 0 0 var(--key-edge);
}

.tool .icon-off,
.tool.off .icon-on {
    display: none;
}

.tool.off .icon-off {
    display: block;
}

.tool[aria-pressed='true']#btn-keypad {
    background: #fff1b8;
}

/* ---------- Screen ---------- */

.stage {
    grid-area: stage;
    min-width: 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.bezel {
    padding: var(--bezel-pad);
    border-radius: calc(var(--bezel-pad) + 12px);
    background: linear-gradient(160deg, var(--bezel-1), var(--bezel-2));
    box-shadow:
        inset 0 1px 0 rgb(255 255 255 / 60%),
        inset 0 -2px 0 rgb(0 0 0 / 8%),
        0 10px 24px rgb(60 40 10 / 18%),
        0 2px 4px rgb(60 40 10 / 12%);
}

.crt {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    background: #000;
}

.crt canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.kbd-hint {
    display: none;
    box-sizing: border-box;
    height: var(--hint-h);
    margin: 0;
    padding-top: 12px;
    font-size: 15px;
    color: var(--ink-soft);
    text-align: center;
    white-space: nowrap;
}

[data-keypad='hidden'] .kbd-hint {
    display: block;
}

kbd {
    padding: 1px 7px;
    border-radius: 6px;
    font: inherit;
    font-size: 0.85em;
    font-weight: 700;
    color: var(--ink);
    background: var(--bg-2);
    box-shadow: 0 2px 0 var(--key-edge);
}

.overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    background: radial-gradient(
        ellipse at center,
        rgb(30 24 60 / 55%),
        rgb(10 8 20 / 85%)
    );
}

.overlay[hidden] {
    display: none;
}

.play {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 0.55em 1.2em 0.55em 0.9em;
    border: 0;
    border-radius: 999px;
    font: inherit;
    font-size: clamp(24px, 4.4vmin, 40px);
    font-weight: 900;
    color: #fff;
    background: var(--ret);
    box-shadow:
        0 6px 0 var(--ret-edge),
        0 14px 28px rgb(0 0 0 / 35%);
    cursor: pointer;
}

.play svg {
    width: 1.2em;
    height: 1.2em;
    fill: currentColor;
}

.play:active {
    transform: translateY(5px);
    box-shadow:
        0 1px 0 var(--ret-edge),
        0 6px 12px rgb(0 0 0 / 30%);
}

.play:disabled {
    background: #6f7883;
    box-shadow: 0 6px 0 #4b525b;
    cursor: progress;
}

.overlay-msg {
    max-width: 80%;
    margin: 0;
    font-size: 17px;
    color: #fff;
    text-align: center;
}

.overlay-msg:empty {
    display: none;
}

/* ---------- Keypad ---------- */

.dock {
    grid-area: dock;
    box-sizing: border-box;
    min-width: 0;
    min-height: 0;
    padding: 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border-radius: 22px;
    background: var(--panel);
    box-shadow: inset 0 2px 6px rgb(60 40 10 / 12%);
    touch-action: none;
}

.pad {
    display: none;
    gap: 10px;
    height: 100%;
    max-height: var(--pad-max);
    padding-bottom: 5px; /* room for the key edges */
}

.dock[data-pad='num'] .pad-num,
.dock[data-pad='abc'] .pad-abc {
    display: grid;
}

.pad-num {
    --pad-max: 640px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-template-rows: repeat(6, minmax(0, 1fr));
    grid-template-areas:
        'k1 k2 k3'
        'k4 k5 k6'
        'k7 k8 k9'
        'lt k0 rt'
        'ret ret ret'
        'esc spc abc';
}

.pad-abc {
    --pad-max: 720px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-template-rows: repeat(8, minmax(0, 1fr));
    grid-template-areas:
        'ka kb kc kd'
        'ke kf kg kh'
        'ki kj kk kl'
        'km kn ko kp'
        'kq kr ks kt'
        'ku kv kw kx'
        'ky kz spc spc'
        'lt ret ret num';
}

@media (orientation: portrait) {
    .pad-num {
        --pad-max: 400px;
        grid-template-columns: repeat(6, minmax(0, 1fr));
        grid-template-rows: repeat(3, minmax(0, 1fr));
        grid-template-areas:
            'k1 k2 k3 k4 k5 ret'
            'k6 k7 k8 k9 k0 ret'
            'lt rt spc spc esc abc';
    }

    .pad-abc {
        --pad-max: 480px;
        grid-template-columns: repeat(7, minmax(0, 1fr));
        grid-template-rows: repeat(5, minmax(0, 1fr));
        grid-template-areas:
            'ka kb kc kd ke kf kg'
            'kh ki kj kk kl km kn'
            'ko kp kq kr ks kt ku'
            'kv kw kx ky kz spc spc'
            'num lt lt ret ret ret ret';
    }
}

.key {
    --edge: var(--key-edge);
    appearance: none;
    min-width: 0;
    min-height: 0;
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: 14px;
    font: inherit;
    font-size: clamp(22px, 4vmin, 42px);
    font-weight: 800;
    line-height: 1;
    color: var(--ink);
    background: var(--key);
    box-shadow:
        0 5px 0 var(--edge),
        0 7px 12px rgb(60 40 10 / 14%);
    cursor: pointer;
    touch-action: none;
}

.key-letter {
    font-size: clamp(18px, 3.2vmin, 32px);
}

.key-return {
    --edge: var(--ret-edge);
    color: #fff;
    background: var(--ret);
    font-size: clamp(16px, 2.6vmin, 26px);
    letter-spacing: 0.04em;
}

.key-back {
    --edge: var(--back-edge);
    color: #fff;
    background: var(--back);
}

.key-fn {
    --edge: var(--fn-edge);
    color: #fff;
    background: var(--fn);
    font-size: clamp(14px, 2.2vmin, 22px);
    letter-spacing: 0.04em;
}

.key-fn[data-code='21'] {
    font-size: clamp(22px, 4vmin, 42px);
}

.key-toggle {
    --edge: var(--toggle-edge);
    color: #fff;
    background: var(--toggle);
    font-size: clamp(14px, 2.2vmin, 22px);
    letter-spacing: 0.04em;
}

.key:active,
.key.pressed {
    transform: translateY(4px);
    box-shadow:
        0 1px 0 var(--edge),
        0 2px 4px rgb(60 40 10 / 14%);
}

@media (hover: hover) {
    .key:hover,
    .tool:hover {
        filter: brightness(1.05);
    }
}

/* ---------- Dialogs ---------- */

dialog.sheet {
    box-sizing: border-box;
    width: calc(100vw - 32px);
    max-width: 460px;
    max-height: calc(var(--vh) - 48px);
    overflow: auto;
    padding: 24px 26px;
    border: 0;
    border-radius: 22px;
    color: var(--ink);
    background: var(--bg-2);
    box-shadow: 0 20px 60px rgb(0 0 0 / 35%);
    font: inherit;
}

dialog.sheet-wide {
    max-width: 600px;
}

dialog::backdrop {
    background: rgb(30 20 50 / 45%);
}

.sheet h2 {
    margin: 0 0 8px;
    font-size: 26px;
}

.sheet h3 {
    margin: 20px 0 6px;
    font-size: 18px;
}

.sheet p,
.howto {
    margin: 0;
    font-size: 17px;
    line-height: 1.45;
}

.howto {
    padding-left: 1.2em;
}

.howto li + li {
    margin-top: 6px;
}

.sheet-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 20px;
}

.sheet-actions form {
    margin: 0;
}

.sheet-actions-start {
    justify-content: flex-start;
    margin-top: 12px;
}

.btn {
    padding: 12px 20px;
    border: 0;
    border-radius: 14px;
    font: inherit;
    font-size: 17px;
    font-weight: 800;
    color: var(--ink);
    background: var(--key);
    box-shadow: 0 4px 0 var(--key-edge);
    cursor: pointer;
}

.btn[hidden] {
    display: none;
}

.btn:active {
    transform: translateY(3px);
    box-shadow: 0 1px 0 var(--key-edge);
}

.btn-go {
    color: #fff;
    background: var(--ret);
    box-shadow: 0 4px 0 var(--ret-edge);
}

/* Deliberately plain so it doesn't invite a curious tap. */
.btn-danger {
    margin-top: 10px;
    padding: 8px 14px;
    font-size: 15px;
    color: #a3352a;
    background: transparent;
    box-shadow: inset 0 0 0 2px #d9b3a8;
}

.btn-danger:active {
    box-shadow: inset 0 0 0 2px #a3352a;
}

.nowrap {
    white-space: nowrap;
}

.credits {
    font-size: 14px !important;
    color: var(--ink-soft);
}

.credits a {
    color: #1f5fd1;
}

/* Phones and very small windows: keep everything on one line. */
@media (max-width: 600px) {
    :root {
        --top-h: 44px;
        --pad: 8px;
        --gap: 8px;
    }

    .title {
        font-size: 20px;
    }

    .tools {
        gap: 6px;
    }

    .tool {
        width: 38px;
        height: 38px;
    }

    [data-keypad='hidden'] {
        --hint-h: 0px;
    }

    .kbd-hint {
        display: none !important;
    }
}