:root {
    --bg: #ffffff;
    --fg: #202020;
    --muted: #5e5e5e;
    --faint: #8a8a8a;
    --line: #ececec;
    --underline: #d4d4d4;
    --hover: #f7f7f7;
    --thumb-border: #e8e8e8;
    color-scheme: light;
}

html.dark {
    --bg: #141414;
    --fg: #f3f3f3;
    --muted: #b0b0b0;
    --faint: #8d8d8d;
    --line: #2a2a2a;
    --underline: #4a4a4a;
    --hover: #1d1d1d;
    --thumb-border: #333333;
    color-scheme: dark;
}

* { box-sizing: border-box; }

@font-face {
    font-family: "Geist";
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url("../fonts/geist-sans-400.woff2") format("woff2");
}

@font-face {
    font-family: "Geist";
    font-style: normal;
    font-weight: 500;
    font-display: swap;
    src: url("../fonts/geist-sans-500.woff2") format("woff2");
}

@font-face {
    font-family: "Geist";
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url("../fonts/geist-sans-600.woff2") format("woff2");
}

html { background: var(--bg); }

html:not([lang="en"]) .en { display: none; }
html[lang="en"] .zh { display: none; }

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--fg);
    font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    text-rendering: optimizeLegibility;
    overflow-x: clip;
}

a { color: inherit; }

.page {
    width: min(68rem, 100%);
    margin: 0 auto;
    padding: 2.75rem 1.5rem 4.5rem;
}

.top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem 1rem;
    min-width: 0;
}

.back {
    color: var(--fg);
    font-size: 17px;
    font-weight: 560;
    text-decoration: underline;
    text-decoration-color: var(--underline);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

.back:hover { text-decoration-color: var(--fg); }

.tools {
    display: flex;
    align-items: center;
    flex: none;
    gap: 0.55rem;
}

.langs {
    display: inline-flex;
    align-items: center;
    gap: 0.28rem;
    color: #8a8a8a;
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.14em;
    line-height: 1;
    text-transform: uppercase;
    user-select: none;
}

html.dark .langs { color: var(--faint); }

.langs button {
    position: relative;
    margin: 0;
    padding: 0 0 2px;
    border: 0;
    background: none;
    color: inherit;
    font: inherit;
    letter-spacing: inherit;
    text-transform: inherit;
    cursor: pointer;
}

.langs button[data-lang="zh-Hans"] { letter-spacing: 0.02em; }

.langs button:hover,
.langs button[aria-pressed="true"] { color: var(--fg); }

.langs button[aria-pressed="true"]::after {
    content: "";
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 1px;
    background: currentColor;
}

.tool-rule {
    width: 1px;
    height: 16px;
    background: var(--line);
}

.theme {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--faint);
    cursor: pointer;
}

.theme:hover { color: var(--fg); }

.sun { display: none; }
html.dark .moon { display: none; }
html.dark .sun { display: block; }

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--fg);
    outline-offset: 3px;
}

.lead {
    max-width: min(40rem, 100%);
    min-width: 0;
}

.identity {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    margin-top: 2.4rem;
    min-width: 0;
}

.identity > div { min-width: 0; }

.identity img {
    width: 64px;
    height: 64px;
    border: 1px solid var(--thumb-border);
    border-radius: 16px;
}

h1 {
    margin: 0;
    font-size: 17px;
    font-weight: 560;
    letter-spacing: -0.01em;
    line-height: 1.35;
}

.role {
    margin: 0.15rem 0 0;
    color: var(--muted);
    font-size: 17px;
    font-weight: 500;
    line-height: 1.35;
}

.lede {
    margin: 1.35rem 0 0;
    font-size: 16px;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.9rem 1.25rem;
    margin: 1rem 0 0;
}

.actions a.download {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    min-height: 44px;
    padding: 0.7rem 1rem;
    border: 1px solid var(--fg);
    border-radius: 8px;
    background: var(--fg);
    color: var(--bg);
    font-size: 14px;
    font-weight: 600;
    line-height: 1.25;
    text-decoration: none;
    white-space: nowrap;
    transition: background-color 150ms, color 150ms, border-color 150ms;
}

.actions a.download:visited { color: var(--bg); }
.actions a.download:hover { opacity: 0.85; text-decoration: none; }
.actions a.download[aria-disabled="true"] {
    background: var(--hover);
    border-color: var(--underline);
    color: var(--muted);
    cursor: not-allowed;
    opacity: 1;
}
.download-icon { display: block; flex: none; }

.download-note,
.download-status {
    margin: 0.65rem 0 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.65;
}

.download-status { margin-top: 0.35rem; }

.actions a,
.end a {
    color: var(--fg);
    font-weight: 540;
    text-decoration: underline;
    text-decoration-color: var(--underline);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

.actions a:hover,
.end a:hover,
.back:hover { text-decoration-color: var(--fg); }

.flow {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    max-width: 100%;
    margin: 1.35rem 0 0;
    padding: 0;
    list-style: none;
}

.flow li { display: inline-flex; align-items: center; }

.flow li:not(:last-child)::after {
    content: "→";
    margin: 0 0.55rem;
    color: var(--faint);
}

.windows {
    display: grid;
    gap: 2.4rem;
    margin: 2.6rem 0 0;
    min-width: 0;
}

.window {
    min-width: 0;
    margin: 0;
}

.window img {
    display: block;
    width: 100%;
    max-width: 100%;
    height: auto;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #241838;
}

.window figcaption {
    max-width: 40rem;
    margin-top: 0.7rem;
    color: var(--muted);
    font-size: 16px;
}

.window figcaption strong {
    display: block;
    margin-bottom: 0.15rem;
    color: var(--fg);
    font-size: 16px;
    font-weight: 560;
}

.cli {
    max-width: 40rem;
    margin-top: 3rem;
}

.cli h2 {
    margin: 0 0 0.7rem;
    font-size: 16px;
    font-weight: 560;
}

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

.cli p code {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.92em;
}

.cli pre {
    margin: 0.9rem 0 0;
    padding: 0.9rem 1rem;
    max-width: 100%;
    overflow: auto;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--hover);
    color: var(--fg);
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 13px;
    line-height: 1.55;
}

.cli pre + p { margin-top: 0.85rem; }

.end {
    margin: 2.4rem 0 0;
    color: var(--faint);
    font-size: 14px;
}

.end span[aria-hidden="true"] { margin: 0 0.35rem; }

html[lang="en"] body {
    font-family: "Geist", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
    font-weight: 400;
    font-synthesis: none;
    letter-spacing: -0.011em;
}

html[lang="en"] h1,
html[lang="en"] .back,
html[lang="en"] h2,
html[lang="en"] .window figcaption strong,
html[lang="en"] .actions a,
html[lang="en"] .end a {
    font-weight: 500;
}

@media (max-width: 640px) {
    .page {
        padding: 2.25rem 1rem 4rem;
    }
}