@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@300;400&display=swap');

:root {
    --space-4: 4px;
    --space-8: 8px;
    --space-16: 16px;
    --space-24: 24px;
    --space-48: 48px;
    --gap: var(--space-16);
    --theme-deep: #1A0F0A;
    --ui-accent: #fcf5f3;
}

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

html, body { height: 100%; }

body {
    background: var(--theme-deep);
    font-family: 'DM Mono', monospace;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

header {
    position: fixed;
    top: 24px;
    left: 24px;
    color: var(--ui-accent);
    font-size: 13px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    opacity: 0.85;
    z-index: 100;
    pointer-events: none;
    display: inline-flex;
    align-items: baseline;
    gap: var(--space-8);
    line-height: 1;
}

#chapter-name {
    opacity: 0.4;
    letter-spacing: 0.15em;
}

.toolbar {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    z-index: 100;
    background: color-mix(in srgb, var(--theme-deep) 80%, transparent);
    border: 1px solid color-mix(in srgb, var(--ui-accent) 12%, transparent);
    border-radius: 4px;
    backdrop-filter: blur(12px);
}

.toolbar-btn {
    width: 40px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ui-accent);
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 14px;
    opacity: 0.7;
    transition: opacity 0.15s;
}

.toolbar-btn:hover { opacity: 1; }
.toolbar-btn.disabled { opacity: 0.2; pointer-events: none; }
.toolbar-btn.active { opacity: 1; }

#btn-clone {
    position: fixed;
    top: 24px;
    right: 24px;
    color: var(--ui-accent);
    font-family: 'DM Mono', monospace;
    font-size: 13px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    opacity: 0.85;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 100;
    padding: 0;
    transition: opacity 0.15s;
    line-height: 1;
    display: inline-flex;
    align-items: baseline;
    gap: var(--space-8);
}

#btn-clone:hover { opacity: 1; }
#btn-clone.active { opacity: 1; }

.toolbar-sep {
    width: 1px;
    height: var(--space-16);
    background: color-mix(in srgb, var(--ui-accent) 15%, transparent);
}

.toolbar-label {
    padding: 0 var(--space-16);
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ui-accent);
    opacity: 0.75;
    white-space: nowrap;
    flex: 0 0 auto;
}

.grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: var(--gap);
    width: min(100vw, 200dvh, 848px);
    height: min(100dvh, 50vw, 416px);
}

@media (max-width: 720px) {
    header {
        top: 16px;
        left: 16px;
        font-size: 14px;
        letter-spacing: 0.16em;
        align-items: baseline;
    }

    #chapter-name {
        letter-spacing: 0.12em;
    }

    .toolbar {
        bottom: 16px;
        width: auto;
        max-width: none;
        justify-content: initial;
    }

    .toolbar-btn {
        width: 52px;
        height: 44px;
        font-size: 18px;
    }

    .toolbar-label {
        padding: 0 var(--space-16);
        font-size: 12px;
        white-space: nowrap;
    }

    #btn-clone {
        top: 16px;
        right: 16px;
        font-size: 14px;
        letter-spacing: 0.16em;
        min-width: 52px;
        min-height: 44px;
        display: inline-flex;
        align-items: baseline;
        justify-content: center;
        gap: var(--space-8);
    }

    .grid {
        --g: 8px;
        --safe-h: calc(100dvh - 128px);
        --cell: min(
            calc((var(--safe-h) - 3 * var(--g)) / 4),
            calc((100vw - 32px - var(--g)) / 2)
        );
        width: calc(2 * var(--cell) + var(--g));
        height: calc(4 * var(--cell) + 3 * var(--g));
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(4, 1fr);
        gap: var(--g);
    }

    .label {
        font-size: 10px;
        letter-spacing: 0.08em;
    }

    .guide-popover {
        left: 16px;
        right: 16px;
        width: auto;
        top: 72px;
        padding: var(--space-16);
        font-size: 13px;
    }

    .guide-title {
        font-size: 12px;
    }

    .guide-steps {
        gap: 8px;
    }
}

.card {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
}

.label {
    font-size: 11px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ui-accent);
    opacity: 0.7;
}

.cell {
    flex: 1;
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.15s ease;
}

.cell:hover {
    transform: scale(1.015);
    z-index: 10;
}

.guide-popover {
    position: fixed;
    top: var(--space-48);
    right: 24px;
    width: 220px;
    background: color-mix(in srgb, var(--theme-deep) 92%, transparent);
    border: 1px solid color-mix(in srgb, var(--ui-accent) 18%, transparent);
    border-radius: 8px;
    backdrop-filter: blur(16px);
    padding: var(--space-16);
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
    font-size: 12px;
    color: var(--ui-accent);
    line-height: 1.6;
    opacity: 0;
    pointer-events: none;
    transform: translateY(calc(-1 * var(--space-8)));
    transition: opacity 0.9s ease, transform 0.9s ease;
}

.guide-popover.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.guide-title {
    font-size: 10px;
    letter-spacing: 0.04em;
    opacity: 0.5;
}

.guide-steps {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
}

.guide-steps a {
    color: inherit;
    text-decoration: none;
}

.guide-steps li {
    display: block;
}

.theme-option {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    min-height: 40px;
    padding: 0 var(--space-8);
    border: 1px solid transparent;
    border-radius: 4px;
    color: color-mix(in srgb, var(--ui-accent) 82%, transparent);
    transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.theme-option:hover {
    border-color: color-mix(in srgb, var(--ui-accent) 14%, transparent);
    background: color-mix(in srgb, var(--ui-accent) 4%, transparent);
    color: var(--ui-accent);
}

.theme-option.is-active {
    border-color: color-mix(in srgb, var(--ui-accent) 18%, transparent);
    background: color-mix(in srgb, var(--ui-accent) 7%, transparent);
    color: var(--ui-accent);
}

.theme-option-label {
    letter-spacing: 0.12em;
    text-align: left;
    width: 100%;
}

@media (max-width: 720px) {
    .theme-option {
        min-height: 48px;
        padding: 0 var(--space-16);
    }

    .theme-option-label {
        font-size: 13px;
    }
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
    image-rendering: pixelated;
}