/* Shared by the home page and the manual: tokens, header, mobile menu and footer. */
:root {
    color-scheme: light;
    --ink: #19243a;
    --ink-soft: #566177;
    --ink-mute: #667188;
    --accent: #4768de;
    --accent-dark: #3452bf;
    --surface: #f6f7fb;
    --edge: #dfe4ed;
    --font: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "Yu Gothic UI", "Malgun Gothic", "Microsoft YaHei UI", sans-serif;
    --font-display: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, "Yu Gothic UI", "Malgun Gothic", "Microsoft YaHei UI", sans-serif
}

* {
    box-sizing: border-box
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 104px
}

body {
    margin: 0;
    color: var(--ink);
    background: var(--surface);
    font: 400 16px/1.65 var(--font);
    -webkit-font-smoothing: antialiased;
    overflow-wrap: break-word
}

a {
    color: var(--accent);
    text-underline-offset: 5px
}

a:hover {
    color: var(--accent-dark)
}

button,
select {
    font: inherit
}

button {
    cursor: pointer
}

button,
a,
select {
    -webkit-tap-highlight-color: transparent
}

[hidden] {
    display: none !important
}

:focus-visible {
    outline: 3px solid #6489fa;
    outline-offset: 5px;
    border-radius: 4px
}

::selection {
    background: #c9d7fc;
    color: #18213a
}

.container {
    width: min(1240px, calc(100% - 96px));
    margin-inline: auto
}

.icon {
    width: 20px;
    height: 20px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.7;
    stroke-linecap: round;
    stroke-linejoin: round
}

.svg-sprite {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden
}

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

.skip-link {
    position: fixed;
    top: -100px;
    left: 16px;
    z-index: 100;
    padding: 12px 20px;
    color: white;
    background: var(--accent);
    border-radius: 8px
}

.skip-link:focus {
    top: 12px;
    color: white
}

/* Navigation */
.masthead {
    position: sticky;
    top: 0;
    z-index: 20;
    background: #f6f7fbef;
    backdrop-filter: blur(20px);
    border-bottom: 1px solid #19243a09
}

.header-inner {
    min-height: 84px;
    display: flex;
    align-items: center;
    gap: 32px
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    color: var(--ink);
    text-decoration: none;
    font: 700 23px/1 var(--font-display);
    letter-spacing: -.8px;
    flex-shrink: 0
}

.brand:hover {
    color: var(--ink)
}

.brand-dot {
    color: var(--accent)
}

.primary-nav {
    display: flex;
    align-items: center;
    gap: 28px;
    margin-left: auto
}

.primary-nav a {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    min-height: 44px;
    color: var(--ink-soft);
    font-size: 13px;
    text-decoration: none
}

.primary-nav a:hover {
    color: var(--accent)
}

.primary-nav a[aria-current="page"] {
    color: var(--accent-dark)
}

.primary-nav .icon {
    width: 16px;
    height: 16px
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 22px
}

.lang {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--ink-soft)
}

.lang .icon {
    width: 17px;
    height: 17px
}

.lang select {
    appearance: none;
    max-width: 118px;
    height: 44px;
    padding: 0 17px 0 0;
    color: inherit;
    border: 0;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    background: transparent url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='m1 1 4 4 4-4' fill='none' stroke='%2369758a' stroke-width='1.4'/%3E%3C/svg%3E") no-repeat right center
}

.lang select option {
    color: var(--ink);
    background: white
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    min-height: 54px;
    padding: 15px 23px;
    border: 1px solid var(--edge);
    border-radius: 10px;
    color: var(--ink);
    background: white;
    font-size: 14px;
    font-weight: 600;
    line-height: 1.4;
    text-align: center;
    text-decoration: none;
    transition: background .2s, box-shadow .2s, transform .2s
}

.button:hover {
    color: var(--ink);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px #203f7615
}

.button.primary {
    color: white;
    background: var(--accent);
    border-color: var(--accent);
    box-shadow: inset 0 1px #ffffff35, 0 7px 24px #213caf20
}

.button.primary:hover {
    background: var(--accent-dark);
    color: white
}

.button-small {
    min-height: 40px;
    padding: 10px 17px;
    font-size: 12px;
    background: var(--ink);
    color: white;
    border-color: var(--ink)
}

.button-small:hover {
    background: #2c3e60;
    color: white
}

.button-small .icon {
    width: 15px;
    height: 15px
}

.small {
    color: var(--ink-soft);
    font-size: 13px;
    line-height: 1.8
}

.footer {
    padding-block: 30px;
    border-top: 1px solid var(--edge)
}

.footer-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 12px 23px;
    margin: 0;
    padding: 0;
    list-style: none
}

.footer-links a {
    color: var(--ink-soft);
    text-decoration: none;
    font-size: 12px
}

.footer-links a:hover {
    color: var(--accent)
}

.footer>.small {
    margin: 22px 0 0;
    font-size: 11px
}

@media(max-width:1100px) {
    .container {
        width: calc(100% - 64px)
    }

    .primary-nav {
        gap: 18px
    }

    .header-inner {
        gap: 20px
    }

    .header-actions {
        gap: 15px
    }
}

/* Narrower screens keep the manual link; GitHub stays in the footer ("Source code"). */
@media(max-width:840px) {
    .primary-nav .nav-github {
        display: none
    }

    .footer-top {
        align-items: flex-start
    }
}

@media(max-width:620px) {
    html {
        scroll-padding-top: 85px
    }

    .container {
        width: calc(100% - 40px)
    }

    .header-inner {
        min-height: 70px;
        gap: 12px
    }

    .brand {
        font-size: 21px;
        gap: 8px
    }

    .brand>img {
        width: 26px;
        height: 26px
    }

    .header-actions {
        gap: 12px
    }

    .lang>.icon {
        display: none
    }

    .lang select {
        max-width: 84px;
        font-size: 11px
    }

    .header-actions .button {
        font-size: 11px;
        min-height: 36px;
        padding: 9px 12px
    }

    .header-actions .button .icon {
        display: none
    }

    .footer-top {
        flex-direction: column;
        gap: 25px
    }

    .footer-links {
        justify-content: flex-start;
        gap: 12px 20px
    }
}

/* Phones: logo, manual link and language; the hero has the download buttons. */
@media(max-width:480px) {
    .header-actions .button {
        display: none
    }
}

@media(max-width:380px) {
    .container {
        width: calc(100% - 32px)
    }

    .lang select {
        max-width: 72px
    }
}

@media(prefers-reduced-motion:reduce) {
    html {
        scroll-behavior: auto
    }

    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important
    }
}