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

/* --- Base interface colors --- */
:root {
    --background: #1b1b2f;      /* the "sky" color behind the sand */
    --bar: rgba(255, 255, 255, 0.12);
    --bar-border: rgba(255, 255, 255, 0.22);
    --button: rgba(255, 255, 255, 0.16);
    --button-pressed: rgba(255, 255, 255, 0.32);
    --text: #ffffff;
    --green: #2ecc71;
    --red: #ff5a5f;
    /* button size: grows with the screen, but never too small for fingers */
    --button-size: clamp(44px, 4vw, 64px);
    /* there are many color buttons, so they are smaller */
    --color-size: clamp(26px, 2.4vw, 40px);
}

/* --- 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 is split in two: colors on top, the drawing (with the tool bar) below */
body {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;             /* on phones, accounts for the browser's address bar */
}

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

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

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

/* --- 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 the hint, straight to the canvas */
    opacity: 0.9;
    transition: opacity 0.6s;
}

.hint-hand {
    font-size: clamp(60px, 12vw, 110px);
    animation: bounce 1.4s ease-in-out infinite;
}

.hint.fade-out {
    opacity: 0;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(18px); }
}

/* --- Tool bars --- */
.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;
}

.bar-top {
    margin: 10px 8px 6px;
}

/* Side bar: a small column of buttons in the top-right corner, placed OVER
   the drawing area so you can keep drawing underneath it */
.bar-side {
    position: absolute;
    top: 6px;
    right: 8px;
    flex-direction: column;
    flex-wrap: nowrap;
    padding: 10px;
    max-width: none;
}

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

/* Colors may wrap onto several rows, neatly aligned */
.colors {
    gap: 6px;
}

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

/* Drawn 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;
}

/* --- Color buttons --- */
.color {
    width: var(--color-size);
    height: var(--color-size);
    border: 3px solid rgba(255, 255, 255, 0.35);
}

/* Selected color: thick white ring and slightly bigger */
.color.active {
    border-color: #fff;
    transform: scale(1.15);
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.25), 0 0 18px rgba(255, 255, 255, 0.5);
}

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

/* The "rainbow" button — the sand changes color by itself */
.color.rainbow {
    background: conic-gradient(#ff4d4d, #ffb84d, #fff04d, #5dff4d, #4dd2ff, #6b4dff, #e14dff, #ff4d4d);
}

/* --- Confirmation dialog --- */
.dialog {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    background: rgba(0, 0, 0, 0.55);
    z-index: 20;
}

.dialog.hidden {
    display: none;
}

.dialog-box {
    padding: 28px 32px;
    background: #2a2a48;
    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; }
}

.dialog-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: #5b8def; }  /* blue: means "back", not "delete" */

/* --- Small screens (phones): slightly smaller buttons --- */
@media (max-width: 720px) {
    :root {
        --button-size: 42px;
        --color-size: 30px;
    }

    .button {
        font-size: 22px;
    }

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

    /* Colors stretch across the full width so more fit on one row */
    .bar-top {
        align-self: stretch;
        margin: 6px 6px 4px;
    }

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

    .colors,
    .group {
        gap: 5px;
    }
}