/* base.css — cave diving (not even once)
   Page shell, palette custom properties, the canvas frame. */

:root {
    /* The shared back-link and scanline overlay read these. */
    --mc-back-color: #3fe0d0;
    --mc-back-glow: 0 0 8px #3fe0d0;
    --mc-scanline-opacity: 0.11;

    --deep: #030b10;
    --water: #071820;
    --rock: #241f2e;
    --accent: #3fe0d0;
    --accent-pale: #b8fff5;
    --air: #5fe8a4;
    --danger: #ff5f6d;
    --lamp: #fff3c4;
    --hud-text: #dcefee;
    --hud-dim: #5d7a80;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
    background: var(--deep);
    color: var(--hud-text);
    font-family: 'Press Start 2P', monospace;
    overflow: hidden;
    /* The whole game is aiming and stroking; a stray selection drag mid-dive
       is nothing but a way to run out of air. */
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.hidden {
    display: none !important;
}

/* The back link is a way out of the cave that should not be on screen while
   you are in it. */
body.game-active .mc-back {
    display: none;
}

.game-container {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

canvas {
    /* Everything is drawn on a 480x270 grid and scaled up. Smoothing turns the
       rock edges and the lamp cone into a grey wash. */
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    display: block;
    background: var(--deep);
    /* Sized in JS by Renderer.fit(). touch-action none so a steer drag is not
       read as a page scroll. */
    touch-action: none;
}

.btn {
    font-family: 'Press Start 2P', monospace;
    font-size: 9px;
    letter-spacing: 0.08em;
    color: var(--deep);
    background: var(--accent);
    border: none;
    padding: 12px 18px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.btn:hover,
.btn:focus-visible {
    background: var(--accent-pale);
    outline: none;
}

/* Every panel button is a thumb target on a phone, not just the start button. */
@media (hover: none), (pointer: coarse) {
    .btn {
        min-height: 48px;
        padding: 14px 22px;
    }
}