/* SPDX-License-Identifier: GPL-3.0-or-later */
/* Baseboard website: one column, GNOME colours, light and dark from the
   system setting, no web fonts and no scripts. */

:root {
    color-scheme: light dark;
    --bg: #fafafb;
    --card: #ffffff;
    --border: rgb(0 0 6 / 0.1);
    --text: #222226;
    --muted: #5e5c64;
    --accent: #18794e;
    --accent-bg: #18794e;
    --accent-bg-hover: #146b45;
    --button: rgb(0 0 6 / 0.08);
    --button-hover: rgb(0 0 6 / 0.14);
    --badge-bg: #dcf3e5;
    --badge-fg: #105c3a;
    --code: #f0f0f3;
    /* Cards and boxed lists, as in libadwaita. */
    --shadow: 0 1px 3px rgb(0 0 6 / 0.07), 0 2px 8px rgb(0 0 6 / 0.04);
    /* State pills: GNOME Blue 3 at 14 % on the card with Blue 5, and
       Yellow 5 at 20 % on the card with Brown 4. */
    --pill-blue-bg: #e3eefb;
    --pill-blue-fg: #1a5fb4;
    --pill-amber-bg: #faedce;
    --pill-amber-fg: #865e3c;
    /* Strength of the green glow behind the icon and the screenshot. */
    --glow: 0.3;
    font-family: "Adwaita Sans", Cantarell, system-ui, -apple-system, "Segoe UI", sans-serif;
    font-size: 106.25%;
    line-height: 1.6;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #222226;
        --card: #2e2e33;
        --border: rgb(255 255 255 / 0.12);
        --text: #ffffff;
        --muted: #c0bfbc;
        --accent: #57e389;
        --accent-bg: #18794e;
        --accent-bg-hover: #1b8253;
        --button: rgb(255 255 255 / 0.1);
        --button-hover: rgb(255 255 255 / 0.15);
        --badge-bg: #1e3a2b;
        --badge-fg: #8ff0a4;
        --code: #2a2a2f;
        --shadow: 0 1px 3px rgb(0 0 6 / 0.35);
        /* Blue 3 at 25 % with Blue 1, Yellow 5 at 20 % with Yellow 4. */
        --pill-blue-bg: #30445f;
        --pill-blue-fg: #99c1f1;
        --pill-amber-bg: #53462b;
        --pill-amber-fg: #f5c211;
        --glow: 0.55;
    }
}

@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }

    .button {
        transition: background-color 150ms ease-out;
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
}

a {
    color: var(--accent);
    text-underline-offset: 0.15em;
}

a:hover {
    text-decoration-thickness: 2px;
}

:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}

.skip {
    position: absolute;
    left: 1rem;
    top: -4rem;
    z-index: 1;
    padding: 0.5rem 1rem;
    background: var(--card);
    border-radius: 8px;
}

.skip:focus {
    top: 1rem;
}

.wrap {
    max-width: 46rem;
    margin: 0 auto;
    padding: 0 1.25rem;
}

/* Top of the page */

.hero {
    /* The glow may reach past the sides of the screen; clip it there
       without making the page scroll sideways. The glow sits below all
       content of this stacking context, including the badge and buttons. */
    overflow-x: clip;
    isolation: isolate;
    padding-bottom: 0.5rem;
}

.top {
    display: flex;
    justify-content: flex-end;
    padding-top: 1rem;
}

.lang {
    display: flex;
    gap: 0.25rem;
}

.lang a {
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    text-decoration: none;
    color: var(--text);
}

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

.lang a[aria-current="page"] {
    background: var(--button);
    font-weight: 600;
}

.intro {
    text-align: center;
    padding-top: 0.5rem;
}

.icon {
    position: relative;
    width: 128px;
    margin: 0 auto;
}

.icon img {
    display: block;
    width: 128px;
    height: 128px;
}

/* Soft glow in the greens of the icon, fading into the page. */
.icon::before {
    content: "";
    position: absolute;
    inset: -80px;
    z-index: -1;
    background: radial-gradient(closest-side,
        rgb(51 209 122 / var(--glow)) 0%,
        rgb(38 162 105 / calc(var(--glow) * 0.55)) 40%,
        rgb(24 121 78 / calc(var(--glow) * 0.18)) 70%,
        rgb(24 121 78 / 0) 100%);
    pointer-events: none;
}

.badge {
    display: inline-block;
    margin: 1rem 0 0;
    padding: 0.2rem 0.9rem;
    border-radius: 999px;
    background: var(--badge-bg);
    color: var(--badge-fg);
    font-size: 0.95rem;
    font-weight: 700;
}

h1 {
    font-size: 2.75rem;
    line-height: 1.15;
    margin: 0.5rem 0 0.4rem;
}

.lead {
    font-size: 1.25rem;
    color: var(--muted);
    margin: 0 auto;
    max-width: 44rem;
    text-wrap: balance;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.75rem;
}

/* Pill buttons as in libadwaita; the main one in the accent colour. */
.button {
    display: inline-block;
    min-width: 13rem;
    padding: 0.65rem 1.75rem;
    border-radius: 999px;
    background: var(--button);
    color: var(--text);
    font-weight: 700;
    line-height: 1.4;
    text-align: center;
    text-decoration: none;
}

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

.button.primary {
    background: var(--accent-bg);
    color: #ffffff;
}

.button.primary:hover {
    background: var(--accent-bg-hover);
}

.button:focus-visible {
    border-radius: 999px;
}

/* The large screenshot under the buttons, wider than the text column and
   as wide as the System screenshot further down. */
.shot {
    max-width: calc(59.5rem + 2.5rem);
    margin: 2.75rem auto 0;
    padding: 0 1.25rem;
}

.shot picture {
    position: relative;
    display: block;
}

/* Two glows that fit inside their box and fade out before its edges:
   the lighter green of the icon at the top left, the darker at the
   bottom right. */
.shot picture::before {
    content: "";
    position: absolute;
    inset: -16% -12% -10%;
    z-index: -1;
    background:
        radial-gradient(closest-side at 42% 46%,
            rgb(51 209 122 / var(--glow)) 0%,
            rgb(51 209 122 / var(--glow)) 55%,
            rgb(51 209 122 / calc(var(--glow) * 0.45)) 78%,
            rgb(51 209 122 / 0) 100%),
        radial-gradient(closest-side at 58% 54%,
            rgb(38 162 105 / var(--glow)) 0%,
            rgb(38 162 105 / var(--glow)) 55%,
            rgb(38 162 105 / calc(var(--glow) * 0.45)) 78%,
            rgb(38 162 105 / 0) 100%);
    pointer-events: none;
}

.toc ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.2rem 1.1rem;
    padding: 0;
    margin: 1.75rem 0 0;
    font-size: 0.95rem;
}

.toc a {
    text-decoration: none;
}

.toc a:hover {
    text-decoration: underline;
}

/* Sections */

h2 {
    font-size: 1.6rem;
    line-height: 1.25;
    margin: 3.5rem 0 1rem;
}

h3 {
    font-size: 1.15rem;
    margin: 2rem 0 0.5rem;
}

/* Text for screen readers only, such as the punctuation between a state
   pill and the words after it. */
.vh {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
}

/* State pills. The text always names the state in full, so the colour
   only repeats it. */
.pill {
    display: inline-block;
    padding: 0.05rem 0.6rem;
    border: 1.5px solid transparent;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 700;
    line-height: 1.5;
    white-space: nowrap;
}

.pill code {
    padding: 0;
    background: none;
    color: inherit;
    font-size: 1em;
}

.pill-released {
    background: var(--accent-bg);
    color: #ffffff;
}

.pill-mainline {
    border-color: var(--accent);
    color: var(--accent);
}

.pill-next {
    background: var(--pill-blue-bg);
    color: var(--pill-blue-fg);
}

.pill-review {
    background: var(--pill-amber-bg);
    color: var(--pill-amber-fg);
}

.pill-planned {
    background: var(--button);
    color: var(--text);
}

.state-note {
    display: block;
    margin-top: 0.3rem;
    color: var(--muted);
}

/* Kernel work: a faint glow behind the section, well under half of the one
   at the top of the page, and one card (boxed list) per state. */
.work {
    position: relative;
    isolation: isolate;
}

.work::before {
    content: "";
    position: absolute;
    inset: 1rem 0 -1rem;
    z-index: -1;
    background: radial-gradient(closest-side,
        rgb(51 209 122 / calc(var(--glow) * 0.4)) 0%,
        rgb(38 162 105 / calc(var(--glow) * 0.2)) 55%,
        rgb(24 121 78 / 0) 100%);
    pointer-events: none;
}

@media (min-width: 64rem) {
    .work::before {
        inset: 1rem -8rem -1rem;
    }
}

.card {
    margin: 1rem 0;
}

.card-head {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.4rem 1rem;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
}

.card-head h3 {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.3rem 0.6rem;
    margin: 0;
    font-size: 1rem;
    font-weight: 400;
}

.head-note {
    color: var(--muted);
    font-size: 0.95rem;
}

.subsys {
    margin: 0;
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 600;
}

.rows {
    list-style: none;
    margin: 0;
    padding: 0;
}

.rows li {
    display: flex;
    align-items: center;
    gap: 0.3rem 1rem;
    margin: 0;
    padding: 0.7rem 1rem;
}

.rows li + li {
    margin-top: 0;
    border-top: 1px solid var(--border);
}

.row-text {
    flex: 1;
    min-width: 0;
}

.row-note {
    display: block;
    color: var(--muted);
    font-size: 0.9rem;
}

.hash {
    flex: none;
    color: var(--muted);
}

/* On a phone the hash goes under the title. */
@media (max-width: 40rem) {
    .rows li {
        flex-direction: column;
        align-items: flex-start;
    }
}

figure {
    margin: 2rem 0;
}

figure img {
    display: block;
    width: 100%;
    height: auto;
}

figcaption {
    text-align: center;
    color: var(--muted);
    font-size: 0.95rem;
    margin-top: 0.25rem;
}

@media (min-width: 64rem) {
    figure.wide {
        margin-left: -8rem;
        margin-right: -8rem;
    }
}

/* The table and the kernel work cards share one look. */
.table,
.card {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--card);
    box-shadow: var(--shadow);
}

.table {
    overflow-x: auto;
}

table {
    border-collapse: collapse;
    width: 100%;
    min-width: 40rem;
    font-size: 0.95rem;
}

th,
td {
    text-align: left;
    vertical-align: top;
    padding: 0.65rem 0.75rem;
    border-bottom: 1px solid var(--border);
}

tbody tr:last-child > * {
    border-bottom: none;
}

thead th {
    font-weight: 600;
}

tbody th {
    font-weight: 600;
}

/* On narrow screens each row becomes a card; the column names come from
   the data-label attribute of each cell. Below 48rem the four columns no
   longer fit without scrolling. */
@media (max-width: 48rem) {
    .table {
        overflow: visible;
        border: none;
        border-radius: 0;
        background: none;
        box-shadow: none;
    }

    table,
    tbody,
    tr,
    th,
    td {
        display: block;
        min-width: 0;
    }

    thead {
        position: absolute;
        width: 1px;
        height: 1px;
        overflow: hidden;
        clip-path: inset(50%);
        white-space: nowrap;
    }

    tbody tr {
        background: var(--card);
        border: 1px solid var(--border);
        border-radius: 12px;
        box-shadow: var(--shadow);
        margin-bottom: 0.75rem;
        padding: 0.4rem 0;
    }

    tbody th,
    td {
        border-bottom: none;
        padding: 0.3rem 1rem;
    }

    tbody th {
        font-size: 1.05rem;
    }

    td::before {
        content: attr(data-label);
        display: block;
        color: var(--muted);
        font-size: 0.85rem;
        font-weight: 600;
    }
}

.table,
pre {
    scrollbar-width: thin;
    scrollbar-color: var(--muted) transparent;
}

code,
pre {
    font-family: "Adwaita Mono", ui-monospace, "DejaVu Sans Mono", monospace;
    font-size: 0.9em;
}

code {
    background: var(--code);
    border-radius: 4px;
    padding: 0.05em 0.3em;
    white-space: nowrap;
}

pre {
    background: var(--code);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    overflow-x: auto;
    line-height: 1.5;
}

pre code {
    background: none;
    padding: 0;
    font-size: 1em;
    white-space: inherit;
}

main li + li {
    margin-top: 0.3rem;
}

footer {
    margin-top: 4rem;
    padding: 2rem 0 3rem;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.95rem;
}

footer ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1.5rem;
    padding: 0;
    margin: 0 0 1rem;
}

footer p {
    margin: 0.5rem 0;
}