/*
 * Hand-written, no build step. There is deliberately no Node toolchain in this
 * project -- matching the other Jigsaw sites here -- so this file is served
 * exactly as written.
 *
 * Dark by default, since that is what Advent of Code itself looks like, with a
 * light override for anyone who prefers it.
 */

:root {
    --bg: #0f0f23;
    --bg-raised: #10101a;
    --bg-sunken: #0b0b16;
    --border: #333355;
    --text: #cccccc;
    --text-dim: #666688;
    --text-bright: #ffffff;
    --accent: #009900;
    --accent-bright: #00cc00;
    --star: #ffff66;
    --star-dim: #333355;
    --link: #009900;
    --mono: "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;

    --radius: 4px;
    --gap: 1rem;
    --measure: 46rem;
}

@media (prefers-color-scheme: light) {
    :root {
        --bg: #fbfbfd;
        --bg-raised: #ffffff;
        --bg-sunken: #f0f0f4;
        --border: #d4d4e0;
        --text: #26263c;
        --text-dim: #6a6a85;
        --text-bright: #0f0f23;
        --accent: #007700;
        --accent-bright: #005c00;
        --star: #b8860b;
        --star-dim: #c8c8d4;
        --link: #007700;
    }
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--mono);
    font-size: 15px;
    line-height: 1.6;
    -webkit-text-size-adjust: 100%;
}

.wrap {
    max-width: var(--measure);
    margin: 0 auto;
    padding: 2.5rem 1rem 4rem;
}

a {
    color: var(--link);
    text-decoration: none;
}

a:hover,
a:focus-visible {
    color: var(--accent-bright);
    text-decoration: underline;
}

h1,
h2 {
    color: var(--text-bright);
    font-weight: 700;
    line-height: 1.25;
    margin: 0;
}

h1 {
    font-size: 1.75rem;
}

h2 {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
}

code {
    font-family: var(--mono);
    background: var(--bg-sunken);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.1em 0.4em;
    color: var(--accent-bright);
}

pre {
    background: var(--bg-sunken);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.75rem;
    overflow-x: auto;
    font-size: 0.8rem;
    line-height: 1.45;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Shared bits -------------------------------------------------------------- */

.meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 1rem;
    align-items: center;
    color: var(--text-dim);
    font-size: 0.85rem;
    margin: 0.6rem 0 0;
}

.stars {
    color: var(--star);
    letter-spacing: 0.1em;
    white-space: nowrap;
}

.tag {
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.05rem 0.55rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-dim);
}

.breadcrumb {
    font-size: 0.85rem;
    color: var(--text-dim);
    margin-bottom: 1.5rem;
}

.eyebrow {
    margin: 0;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-dim);
}

.unsolved {
    color: var(--text-dim);
    font-style: italic;
}

/* Index ------------------------------------------------------------------- */

.site-header {
    margin-bottom: 2.5rem;
}

.site-header p {
    margin: 0.4rem 0 0;
    color: var(--text-dim);
}

.year-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.4rem;
}

.year-list a {
    display: grid;
    grid-template-columns: 4.5rem 1fr auto;
    gap: var(--gap);
    align-items: center;
    padding: 0.7rem 0.9rem;
    background: var(--bg-raised);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    text-decoration: none;
}

.year-list a:hover,
.year-list a:focus-visible {
    border-color: var(--accent);
}

.year-list__year {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-bright);
}

.year-list__stars {
    color: var(--star);
}

.year-list__count {
    color: var(--text-dim);
    font-size: 0.85rem;
    text-align: right;
}

/* Year calendar ----------------------------------------------------------- */

.year header {
    margin-bottom: 2rem;
}

.calendar {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.4rem;
    grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
}

.day a {
    display: grid;
    grid-template-columns: 2rem 1fr auto;
    gap: 0.6rem;
    align-items: center;
    padding: 0.55rem 0.7rem;
    background: var(--bg-raised);
    border: 1px solid var(--border);
    border-left: 3px solid var(--star-dim);
    border-radius: var(--radius);
    color: var(--text);
    text-decoration: none;
}

.day a:hover,
.day a:focus-visible {
    border-color: var(--accent);
    text-decoration: none;
}

.day--stars-1 a {
    border-left-color: var(--accent);
}

.day--stars-2 a {
    border-left-color: var(--star);
}

.day__number {
    color: var(--text-dim);
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.day__title {
    color: var(--text-bright);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.day__stars {
    color: var(--star);
    letter-spacing: 0.08em;
}

.day--empty a {
    background: transparent;
}

.day--empty .day__title {
    color: var(--text-dim);
    font-style: italic;
}

.day--empty .day__stars {
    color: var(--star-dim);
}

/* An unattempted day links out to adventofcode.com rather than to a page of
   ours, so say so instead of looking like an internal link. */
.day__external .day__title::after {
    content: " ↗";
    color: var(--text-dim);
}

/* Problem page ------------------------------------------------------------ */

.problem header {
    margin-bottom: 2.25rem;
}

.problem h1 {
    margin-top: 0.2rem;
}

.problem section {
    margin-bottom: 2.25rem;
}

.answers dl,
.notes dl {
    display: grid;
    gap: 0.4rem;
    margin: 0.75rem 0 0;
}

.answers dl > div,
.notes dl > div {
    display: grid;
    grid-template-columns: 9rem 1fr;
    gap: var(--gap);
    align-items: baseline;
    padding: 0.5rem 0.7rem;
    background: var(--bg-raised);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.answers dt,
.notes dt {
    color: var(--text-dim);
    font-size: 0.85rem;
}

.answers dd,
.notes dd {
    margin: 0;
    word-break: break-word;
}

.ai-note {
    margin: 0.75rem 0 0;
    font-size: 0.85rem;
    color: var(--text-dim);
}

.prose :first-child {
    margin-top: 0;
}

.prose :last-child {
    margin-bottom: 0;
}

/* Local-only block. Never rendered in production -- see src/Data.php. */

.local-only {
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    background: var(--bg-sunken);
}

.local-only .warning {
    color: var(--text-dim);
    font-size: 0.8rem;
    margin: 0.4rem 0 1rem;
}

.local-only details {
    margin-bottom: 0.6rem;
}

.local-only summary {
    cursor: pointer;
    color: var(--link);
}

.local-only details p {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin: 0.3rem 0 0;
}

/* Narrow screens ---------------------------------------------------------- */

@media (max-width: 34rem) {
    .wrap {
        padding: 1.5rem 0.85rem 3rem;
    }

    .year-list a {
        grid-template-columns: 3.5rem 1fr;
        row-gap: 0.2rem;
    }

    .year-list__count {
        grid-column: 2;
        text-align: left;
    }

    .answers dl > div,
    .notes dl > div {
        grid-template-columns: 1fr;
        gap: 0.15rem;
    }
}