/*
 * Copyright (c) 2026 WebCpp.org
 *
 * Distributed under the Boost Software License, Version 1.0. (See
 * accompanying file LICENSE_1_0.txt or copy at
 * https://www.boost.org/LICENSE_1_0.txt)
 */

/*
 * The site's theme, as the owner chose it (Task 8, design/home-mockup.html): Apple's restraint,
 * large type, much space, one accent, violet, and motion only where it explains. Written for a
 * 360 px screen first, then widened at 768, 1280 and 1440 px; light and dark. Its tokens, light,
 * and the header and the band are chrome.css's, which every page links first: the libraries'
 * pages and the docs index, whose own style is Asciidoctor's, link it alone.
 */

:root {
    color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #000000;
        --surface: #1c1c1e;
        --text: #f5f5f7;
        --muted: #a1a1a6;
        --rule: #38383a;
        /* 7.63 to 1 on black, 6.18 on the surface; the fill under white text 5.86. */
        --accent: #9d8cff;
        --accent-fill: #6246ea;
    }
}

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

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font: 17px/1.5 var(--font);
    overflow-wrap: break-word;
}

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

a:hover {
    text-decoration: underline;
}

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

code,
pre {
    font-family: var(--mono);
    font-size: 0.88em;
}

noscript {
    display: block;
    padding: 8px var(--gutter);
    background: var(--surface);
    color: var(--muted);
    font-size: 14px;
}

/* The page. */

main {
    max-width: var(--measure);
    margin: 0 auto;
    padding: 32px var(--gutter) 48px;
}

h1,
h2 {
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.025em;
    text-wrap: balance;
}

h1 {
    margin: 0 0 24px;
    font-size: 36px;
}

h2 {
    margin: 0 0 12px;
    font-size: 28px;
}

main p {
    max-width: 68ch;
    text-wrap: pretty;
}

/* Each section of a page opens under a rule, after much space. */
main > section {
    margin-top: 48px;
    padding-top: 48px;
    border-top: 1px solid var(--rule);
}

/* On the opening page, the one a Hero opens, a section's text is its lede, quieter than its heading. */
main:has(> .hero) > section > p {
    color: var(--muted);
}

/* A link that stands as a block of the page is a line of its own, so that two never run together. */
main > a,
section > a {
    display: block;
    width: fit-content;
    margin: 0 0 12px;
}

pre {
    margin: 0 0 16px;
    padding: 16px;
    overflow-x: auto;
    border-radius: 12px;
    background: var(--surface);
    line-height: 1.45;
}

/* A command or a name in a sentence is never broken across lines. */
main p code,
main li code {
    padding: 0.1em 0.3em;
    border-radius: 4px;
    background: var(--surface);
    white-space: nowrap;
}

/*
 * The hero: the mark above the heading on a phone, beside it from 768px. As the page opens, the
 * mark's arms close round its angle brackets and its globe, which appear inside them: C++
 * embracing the web. The arms stay opaque, so that nothing shows through the joints' seams.
 */

.hero {
    display: grid;
    gap: 28px;
    padding: 8px 0 8px;
}

.hero-figure {
    order: -1;
}

.hero h1 {
    margin: 0 0 16px;
    font-size: 44px;
    line-height: 1.04;
    letter-spacing: -0.035em;
}

.hero .subtitle {
    max-width: 34em;
    margin: 0 0 28px;
    color: var(--muted);
    font-size: 19px;
    line-height: 1.4;
}

.hero .actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 0;
}

.hero .actions a {
    padding: 11px 22px;
    border-radius: 980px;
    background: var(--accent-fill);
    color: #ffffff;
    font-size: 16px;
    font-weight: 500;
}

.hero .actions a + a {
    background: none;
    box-shadow: inset 0 0 0 1px var(--accent);
    color: var(--accent);
}

.hero .actions a:hover {
    text-decoration: none;
    filter: brightness(1.1);
}

.mark {
    display: block;
    overflow: visible;
}

.mark .ink {
    stroke: var(--text);
}

.mark .acc {
    stroke: var(--accent);
}

.hero .mark {
    width: 96px;
    height: 96px;
}

.mark.opening .arms,
.mark.opening .angles,
.mark.opening .globe {
    transform-box: view-box;
    transform-origin: 50% 50%;
}

.mark.opening .arms {
    animation: embrace 900ms cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.mark.opening .angles,
.mark.opening .globe {
    animation: appear 900ms cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

@keyframes embrace {
    from {
        transform: scaleX(1.25);
    }
}

@keyframes appear {
    from {
        opacity: 0;
        transform: scale(0.7);
    }
}

@media (prefers-reduced-motion: reduce) {
    .mark.opening .arms,
    .mark.opening .angles,
    .mark.opening .globe {
        animation: none;
    }
}

/* The targets: one rail runs through the three, the same code reaching each; down on a phone. */

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

.targets li {
    position: relative;
    padding: 0 0 28px 32px;
}

.targets li:last-child {
    padding-bottom: 0;
}

.targets li::before {
    content: "";
    position: absolute;
    top: 8px;
    left: 0;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--accent);
}

.targets li:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 19px;
    bottom: -8px;
    left: 5px;
    width: 1px;
    background: var(--rule);
}

.targets strong {
    display: block;
    font-size: 21px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.targets p {
    margin: 2px 0 0;
    color: var(--muted);
}

/* The doors: three large lines, each row a link as wide as the page. */

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

.doors li {
    position: relative;
    display: grid;
    gap: 4px;
    padding: 20px 0;
}

.doors li + li {
    border-top: 1px solid var(--rule);
}

.doors li:last-child {
    padding-bottom: 0;
}

.doors a {
    color: var(--text);
    font-size: 26px;
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.02em;
    text-wrap: balance;
}

.doors a::after {
    content: "";
    position: absolute;
    inset: 0;
}

.doors a:hover,
.doors li:hover a {
    color: var(--accent);
    text-decoration: none;
}

.doors p {
    margin: 0;
    color: var(--muted);
}

.roadmap {
    max-width: 68ch;
    margin: 0 0 16px;
    padding-left: 20px;
}

.roadmap li + li {
    margin-top: 6px;
}

/* A list of libraries: each name on its line, its description under it. */

.library-list {
    max-width: 68ch;
    margin: 0 0 16px;
    padding: 0;
    list-style: none;
}

.library-list li {
    padding: 12px 0;
    border-bottom: 1px solid var(--rule);
}

.library-list li:first-child {
    border-top: 1px solid var(--rule);
}

.library-list a {
    font-weight: 600;
}

.library-list p {
    margin: 2px 0 0;
    color: var(--muted);
}

/* The search box: the field takes the row's width, the button keeps its own. */

.search {
    max-width: 640px;
    margin: 0 0 24px;
}

.search label {
    display: block;
    margin-bottom: 8px;
    color: var(--muted);
    font-size: 15px;
}

.search-row {
    display: flex;
    gap: 8px;
}

.search input[type="search"] {
    flex: 1;
    min-width: 0;
    padding: 10px 16px;
    border: 1px solid var(--rule);
    border-radius: 980px;
    background: var(--background);
    color: var(--text);
    font: inherit;
}

.search input[type="search"]:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

.search button {
    padding: 10px 20px;
    border: 0;
    border-radius: 980px;
    background: var(--accent-fill);
    color: #ffffff;
    font: inherit;
    font-weight: 500;
    cursor: pointer;
}

.search button:hover {
    filter: brightness(1.1);
}

.search button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/*
 * The libraries' table: on a phone each row is a block, its cells stacked under the library's
 * name, each labelled; from 768 px a table, which scrolls inside its box rather than widen the page.
 */

.table {
    margin: 0 0 16px;
    overflow-x: auto;
}

.libraries {
    width: 100%;
    border-collapse: collapse;
    font-size: 15px;
}

.libraries thead {
    display: none;
}

.libraries tr,
.libraries th,
.libraries td {
    display: block;
}

.libraries tr {
    padding: 14px 0;
    border-bottom: 1px solid var(--rule);
}

.libraries th,
.libraries td {
    padding: 2px 0;
    text-align: left;
}

.libraries tbody th {
    font-size: 17px;
    font-weight: 600;
}

.libraries td[data-label]::before {
    content: attr(data-label) ": ";
    color: var(--muted);
}

footer.site {
    max-width: var(--measure);
    margin: 0 auto;
    padding: 0 var(--gutter) 40px;
    color: var(--muted);
    font-size: 13px;
}

/* The rule is the paragraph's, so that it spans the text's width, as main's content does. */
footer.site p {
    margin: 0;
    padding-top: 24px;
    border-top: 1px solid var(--rule);
}

@media (min-width: 768px) {
    main {
        padding-top: 48px;
    }

    h1 {
        font-size: 44px;
    }

    h2 {
        font-size: 36px;
    }

    main > section {
        margin-top: 64px;
        padding-top: 64px;
    }

    .hero {
        grid-template-columns: minmax(0, 1fr) auto;
        align-items: center;
        gap: 48px;
        padding: 24px 0 24px;
    }

    .hero-figure {
        order: 0;
    }

    .hero h1 {
        font-size: 64px;
    }

    .hero .subtitle {
        font-size: 22px;
    }

    .hero .mark {
        width: 200px;
        height: 200px;
    }

    .targets {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 32px;
    }

    .targets li {
        padding: 32px 0 0;
    }

    .targets li::before {
        top: 0;
    }

    .targets li:not(:last-child)::after {
        top: 5px;
        right: -32px;
        bottom: auto;
        left: 11px;
        width: auto;
        height: 1px;
    }

    .doors li {
        grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
        align-items: baseline;
        gap: 32px;
        padding: 28px 0;
    }

    .doors li:last-child {
        padding-bottom: 0;
    }

    .doors a {
        font-size: 36px;
    }

    .doors p {
        font-size: 19px;
    }

    .libraries thead {
        display: table-header-group;
    }

    .libraries tr {
        display: table-row;
        padding: 0;
    }

    .libraries th,
    .libraries td {
        display: table-cell;
        padding: 10px 16px 10px 0;
        border-bottom: 1px solid var(--rule);
        vertical-align: top;
    }

    .libraries thead th {
        color: var(--muted);
        font-size: 13px;
        font-weight: 500;
    }

    .libraries tbody th {
        font-size: inherit;
    }

    .libraries td[data-label]::before {
        content: none;
    }
}

@media (min-width: 1280px) {
    .hero {
        padding: 48px 0 40px;
    }

    .hero h1 {
        font-size: 84px;
    }

    .hero .subtitle {
        font-size: 24px;
    }

    .hero .mark {
        width: 260px;
        height: 260px;
    }
}

@media (min-width: 1440px) {
    body {
        font-size: 18px;
    }

    .hero h1 {
        font-size: 88px;
    }
}