/* ==========================================================
   Light Painting — page styles
   Designed for young kids: big buttons, bright colors, little text.
   ========================================================== */

/* --- Base interface colors --- */
:root {
    --background: #05050c;      /* the "night" on which the light threads glow */
    --bar: rgba(255, 255, 255, 0.10);
    --bar-border: rgba(255, 255, 255, 0.20);
    --button: rgba(255, 255, 255, 0.14);
    --button-pressed: rgba(255, 255, 255, 0.30);
    --text: #ffffff;
    --text-dim: rgba(255, 255, 255, 0.75);
    --green: #2ecc71;
    --red: #ff5a5f;
    --blue: #5b8def;
    /* button size: grows with the screen, but never too small for fingers */
    --button-size: clamp(44px, min(4vw, 7vh), 60px);
    /* there are more color buttons, so they are a bit smaller */
    --color-size: clamp(22px, min(2vw, 3.6vh), 28px);
}

/* --- Simple reset --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;           /* no scrollbars */
    background: var(--background);
    color: var(--text);
    font-family: "Comic Sans MS", "Chalkboard SE", "Segoe UI", system-ui, sans-serif;
    /* Disable text selection and the long-press menu */
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

/* The page has two parts: colors on top, the drawing with its toolbar below */
body {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;             /* on phones, account for the browser bar */
}

/* --- Middle: drawing area, with the toolbar floating over it --- */
.middle {
    position: relative;         /* the side bar is positioned relative to it */
    flex: 1;
    min-height: 0;
    display: flex;
}

/* --- Drawing area: all remaining space --- */
.draw-area {
    position: relative;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

/* --- The canvas fills the drawing area (exact size is set from JavaScript) --- */
#canvas {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    touch-action: none;         /* the finger draws instead of scrolling the page */
    cursor: crosshair;
}

/* --- Symmetry guide: faint rays starting from the center --- */
.guide {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;       /* touches pass through to the canvas */
}

.guide .ray {
    stroke: rgba(255, 255, 255, 0.35);
    stroke-width: 2;
    stroke-dasharray: 6 10;
    stroke-linecap: round;
    opacity: 0;
    transition: opacity 1.2s ease-out;
}

.guide.visible .ray {
    opacity: 1;
    transition: opacity 0.2s;
}

/* The center dot always stays, very faint: this is where the symmetry "starts" */
.guide .center {
    fill: rgba(255, 255, 255, 0.25);
}

/* --- Start hint --- */
.hint {
    position: absolute;
    top: 45%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    font-size: clamp(24px, 5vw, 44px);
    text-align: center;
    pointer-events: none;       /* touches pass through to the canvas */
    opacity: 0.9;
    transition: opacity 0.6s;
    text-shadow: 0 0 18px rgba(160, 200, 255, 0.6);
}

.hint-hand {
    font-size: clamp(60px, 12vw, 110px);
    animation: wander 2.2s ease-in-out infinite;
}

.hint.fade {
    opacity: 0;
}

/* The hand "draws" a small loop in the air */
@keyframes wander {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25%      { transform: translate(22px, 10px) rotate(8deg); }
    50%      { transform: translate(0, 20px) rotate(0deg); }
    75%      { transform: translate(-22px, 10px) rotate(-8deg); }
}

/* --- Toolbars --- */
.bar {
    flex-shrink: 0;
    align-self: center;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 12px;
    max-width: calc(100% - 16px);
    padding: 10px 14px;
    background: var(--bar);
    border: 2px solid var(--bar-border);
    border-radius: 28px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 10;
}

/* Color bar: a thin column of small circles in the top-left corner,
   floating OVER the drawing area (so the canvas center stays in the middle) */
.bar-colors {
    position: absolute;
    top: 6px;
    left: 8px;
    max-width: none;
    max-height: calc(100% - 12px);
    padding: 10px 8px;
    border-radius: 999px;
}

/* The circles are stacked one under another */
.bar-colors .colors {
    flex-direction: column;
    flex-wrap: nowrap;
}

/* Side bar: a column of tools in the top-right corner, floating OVER the
   drawing area, so kids can keep drawing underneath it */
.bar-side {
    position: absolute;
    top: 6px;
    right: 8px;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    padding: 10px;
    max-width: none;
    border-radius: 24px;
}

.group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

/* In the side bar, groups are stacked, separated by a line */
.bar-side .group {
    flex-direction: column;
    flex-wrap: nowrap;
}

.bar-side .group + .group {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 2px solid var(--bar-border);
}

/* Clear and save buttons sit side by side */
.bar-side .actions {
    flex-direction: row;
    gap: 8px;
}

/* Space between the color circles */
.colors {
    gap: 9px;
}

/* --- Small texts in the side bar --- */
.label {
    font-size: 13px;
    line-height: 1.15;
    text-align: center;
    color: var(--text-dim);
    max-width: calc(var(--button-size) * 2 + 8px);
}

.symmetry-name {
    font-size: 13px;
    line-height: 1.15;
    text-align: center;
    font-weight: bold;
    min-height: 1.15em;
}

/* Symmetry buttons: a two-column grid */
.symmetries {
    display: grid;
    grid-template-columns: repeat(2, var(--button-size));
    gap: 8px;
}

/* --- Buttons in general --- */
.button {
    width: var(--button-size);
    height: var(--button-size);
    border: none;
    border-radius: 50%;
    background: var(--button);
    color: var(--text);
    font-size: 30px;
    line-height: 1;
    cursor: pointer;
    display: grid;
    place-items: center;
    transition: transform 0.12s, background 0.12s, box-shadow 0.12s;
    touch-action: manipulation;
}

.button:hover {
    background: var(--button-pressed);
}

.button:active {
    transform: scale(0.88);
}

.button:focus-visible {
    outline: 4px solid #fff;
    outline-offset: 3px;
}

/* Clear button: white X on red */
.button.clear {
    background: var(--red);
}

.button.clear:hover {
    background: #ff7a7e;
}

.clear .icon {
    stroke-width: 3.4;
}

/* Save button: camera on blue */
.button.save {
    background: var(--blue);
}

.button.save:hover {
    background: #7aa4f5;
}

/* Line icons (X, camera, check mark, back arrow) */
.icon {
    width: 55%;
    height: 55%;
    fill: none;
    stroke: currentColor;
    stroke-width: 2.4;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.answer .icon {
    stroke-width: 3.2;
}

/* Short "flash" on the save button, so the child sees the picture was taken */
.button.save.flash {
    animation: flash 0.5s ease-out;
}

@keyframes flash {
    0%   { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.9); background: #fff; color: var(--blue); }
    100% { box-shadow: 0 0 0 18px rgba(255, 255, 255, 0); }
}

/* --- Symmetry buttons --- */
.symmetry {
    border: 3px solid transparent;
}

/* Symmetry icon: dots arranged in a circle, one for each repetition */
.symmetry-icon {
    width: 82%;
    height: 82%;
    overflow: visible;
}

.symmetry-icon .spoke {
    stroke: rgba(255, 255, 255, 0.45);
    stroke-width: 2;
    stroke-linecap: round;
}

.symmetry-icon .dot {
    fill: #fff;
}

.symmetry-icon .number {
    fill: #fff;
    font-size: 15px;
    font-weight: bold;
    font-family: inherit;
}

.symmetry-icon .number.small {
    font-size: 10px;
}

/* Selected symmetry: white ring and a glow */
.symmetry.active {
    border-color: #fff;
    background: var(--button-pressed);
    box-shadow: 0 0 14px rgba(255, 255, 255, 0.45);
}

/* --- Color buttons --- */
.color {
    width: var(--color-size);
    height: var(--color-size);
    border: 2px solid rgba(255, 255, 255, 0.3);
    /* each color "glows" in its own hue (--glow is set from JavaScript) */
    box-shadow: 0 0 7px var(--glow, transparent);
}

.color:hover {
    filter: brightness(1.15);
}

/* Selected color: thick white ring, slightly larger, strong glow */
.color.active {
    border-color: #fff;
    transform: scale(1.25);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.25), 0 0 14px 3px var(--glow, #fff);
}

.color.active:active {
    transform: scale(1);
}

/* "Rainbow" button — the light changes color on its own */
.color.rainbow {
    background: conic-gradient(#ff4d4d, #ffb84d, #fff04d, #5dff4d, #4dd2ff, #6b4dff, #e14dff, #ff4d4d);
    --glow: rgba(255, 255, 255, 0.6);
}

/* --- Confirmation dialog --- */
.confirm {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    background: rgba(0, 0, 0, 0.6);
    z-index: 20;
}

.confirm.hidden {
    display: none;
}

.box {
    padding: 28px 32px;
    background: #1e1e36;
    border: 3px solid var(--bar-border);
    border-radius: 28px;
    text-align: center;
    animation: pop-in 0.2s ease-out;
}

@keyframes pop-in {
    from { transform: scale(0.7); opacity: 0; }
    to   { transform: scale(1);   opacity: 1; }
}

.confirm-text {
    font-size: clamp(22px, 4.5vw, 34px);
    margin-bottom: 22px;
}

.answers {
    display: flex;
    justify-content: center;
    gap: 32px;
}

.answer {
    width: 96px;
    height: 96px;
    font-size: 48px;
    font-weight: bold;
}

.answer.yes { background: var(--green); }
.answer.no  { background: var(--blue); }  /* blue means "back", not "delete" */

/* --- Small screens (phones): slightly smaller buttons --- */
@media (max-width: 720px) {
    :root {
        --button-size: 40px;
        --color-size: 22px;
    }

    .bar {
        gap: 8px;
        padding: 8px;
        border-radius: 20px;
    }

    .bar-colors {
        top: 4px;
        left: 6px;
        padding: 8px 6px;
        border-radius: 999px;
    }

    .colors {
        gap: 7px;
    }

    .bar-side {
        top: 4px;
        right: 6px;
        padding: 6px;
    }

    .symmetries,
    .bar-side .actions {
        gap: 6px;
    }

    .label,
    .symmetry-name {
        font-size: 11px;
    }
}

/* --- Very short screens (small laptop window, landscape phone) --- */
@media (max-height: 480px) {
    :root {
        --button-size: 38px;
        --color-size: 20px;
    }

    .label {
        display: none;          /* keep only the selected symmetry name */
    }
}