:root {
    --paper: #fbfaf6;
    --sky: #edf3fc;
    --ink: #16234a;
    --muted: #59627e;
    --faint: #8a91a8;
    --line: rgba(22, 35, 74, 0.11);
    --card: #ffffff;
    --accent: #3558b8;
    --accent-ink: #ffffff;
    --whale: #4d6bfe;
    --gold: #b8873b;
    --radius: 18px;
    --wrap: 1140px;
    --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", serif;
    --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    color-scheme: light;
}

* { box-sizing: border-box; }

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

/* One page, two languages: the other one is hidden. Chinese shows without scripts. */
html[data-lang="zh"] [lang="en"],
html[data-lang="en"] [lang="zh"] { display: none !important; }

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font: 17px/1.7 var(--sans);
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3, p, figure { margin: 0; }
code { font: 0.88em var(--mono); background: rgba(22, 35, 74, 0.06); padding: 0.12em 0.42em; border-radius: 6px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ── Navigation ─────────────────────────────────────────── */
.nav {
    position: sticky; top: 0; z-index: 10;
    background: rgba(251, 250, 246, 0.86);
    backdrop-filter: saturate(1.4) blur(14px);
    -webkit-backdrop-filter: saturate(1.4) blur(14px);
    border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; gap: 22px; height: 62px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font: 600 18px/1 var(--serif); }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.nav-links { display: flex; gap: 20px; margin-left: auto; font-size: 15px; }
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.lang-switch, .gh {
    font: 600 13px/1 var(--sans); color: var(--ink); background: var(--card);
    border: 1px solid var(--line); border-radius: 999px; padding: 8px 13px; cursor: pointer;
}
.gh { display: inline-flex; align-items: center; gap: 6px; }
.gh:hover { text-decoration: none; border-color: rgba(22, 35, 74, 0.3); }
.gh svg { width: 15px; height: 15px; }

/* ── Hero ───────────────────────────────────────────────── */
.hero { padding: 72px 0 0; text-align: center; background: linear-gradient(180deg, var(--sky) 0%, var(--paper) 78%); }
.pill {
    display: inline-flex; gap: 8px; align-items: center; font-size: 13px; color: var(--muted);
    background: rgba(255, 255, 255, 0.8); border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px;
}
.pill b { color: var(--ink); font-weight: 600; }
.wordmark { margin-top: 22px; font: 700 clamp(46px, 8vw, 84px)/1.04 var(--serif); letter-spacing: -0.01em; }
html[data-lang="zh"] .wordmark { letter-spacing: 0.06em; }
.wordmark .alt { display: block; margin-top: 10px; font-size: 0.32em; font-weight: 500; letter-spacing: 0.08em; color: var(--muted); }
.tagline { margin: 22px auto 0; max-width: 760px; font: 400 clamp(19px, 2.4vw, 23px)/1.6 var(--serif); color: #2c3b63; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 32px; }
.btn {
    display: inline-flex; align-items: center; gap: 8px; font: 600 15px/1 var(--sans);
    padding: 14px 20px; border-radius: 12px; border: 1px solid var(--line); background: var(--card); color: var(--ink);
}
.btn:hover { text-decoration: none; border-color: rgba(22, 35, 74, 0.3); }
.btn.primary { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn.primary:hover { background: #22336a; }
.btn svg { width: 16px; height: 16px; }
.caption { margin-top: 14px; font-size: 13.5px; color: var(--faint); }
.cover { margin: 46px auto 0; max-width: 1240px; padding: 0 24px; }
.cover img { width: 100%; border-radius: 24px; box-shadow: 0 30px 70px -30px rgba(22, 35, 74, 0.45); }
.cover figcaption { margin-top: 12px; }

/* ── Sections ───────────────────────────────────────────── */
section { padding: 96px 0 0; }
.eyebrow { font: 600 13px/1 var(--sans); letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); }
h2 { margin-top: 12px; font: 700 clamp(30px, 4.2vw, 44px)/1.18 var(--serif); }
.lede { margin-top: 18px; max-width: 760px; color: var(--muted); font-size: 18px; }
.lede + .lede { margin-top: 12px; }

/* The crew */
.crew { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 40px; }
.role { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 22px 20px; }
.role .badge { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 12px; background: var(--sky); color: var(--accent); }
.role .badge svg { width: 21px; height: 21px; }
.role h3 { margin-top: 14px; font: 700 20px/1.3 var(--serif); }
.role h3 small { margin-left: 8px; font: 500 14px/1 var(--sans); color: var(--faint); }
.role .what { margin-top: 2px; font-size: 13.5px; color: var(--faint); }
.role p.do { margin-top: 10px; font-size: 15.5px; color: var(--muted); line-height: 1.6; }
.note { margin-top: 22px; font-size: 15.5px; color: var(--muted); max-width: 900px; }

/* Highlights: text beside a screenshot, alternating */
.feature { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 48px; align-items: center; margin-top: 64px; }
.feature.flip { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.feature.flip .text { order: 2; }
.feature h3 { font: 700 27px/1.25 var(--serif); }
.feature .text p { margin-top: 14px; color: var(--muted); font-size: 16.5px; }
.feature ul { margin: 14px 0 0; padding-left: 1.1em; color: var(--muted); font-size: 16px; }
.feature li + li { margin-top: 6px; }
.shot { border-radius: 14px; overflow: hidden; border: 1px solid var(--line); box-shadow: 0 22px 50px -28px rgba(22, 35, 74, 0.5); background: #fff; }
.shot-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 28px; }
.shot-pair figcaption, .feature figcaption { margin-top: 10px; font-size: 13.5px; color: var(--faint); }

/* Everything else */
.grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-top: 36px; }
.cell { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px 18px 16px; }
.cell h3 { font: 700 17px/1.35 var(--serif); }
.cell p { margin-top: 6px; font-size: 14.5px; line-height: 1.6; color: var(--muted); }

.examples { margin-top: 30px; font: 600 15px/1.5 var(--sans); color: var(--ink); }
.books { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin-top: 14px; }
.book { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 20px; align-items: start; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; color: var(--ink); }
.book:hover { text-decoration: none; border-color: rgba(22, 35, 74, 0.3); box-shadow: 0 18px 40px -26px rgba(22, 35, 74, 0.45); }
.book img { width: 150px; aspect-ratio: 2 / 3; object-fit: cover; border-radius: 10px; box-shadow: 0 10px 24px -14px rgba(22, 35, 74, 0.6); }
.book h3 { font: 700 22px/1.3 var(--serif); }
.book .by { margin-top: 2px; color: var(--muted); font-size: 14.5px; }
.book .facts { margin-top: 10px; font-size: 13.5px; color: var(--faint); }
.book p:not(.by):not(.facts) { margin-top: 10px; font-size: 15px; line-height: 1.6; color: var(--muted); }
.book .go { display: inline-block; margin-top: 14px; font: 600 15px/1 var(--sans); color: var(--accent); }

/* People drawn in the Studio */
.people { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 14px; margin-top: 36px; }
.people figure { background: var(--card); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.people img { aspect-ratio: 3 / 4; object-fit: cover; width: 100%; }
.people figcaption { padding: 8px 10px 10px; font: 600 14px/1.3 var(--serif); }
.people figcaption small { display: block; font: 400 12px/1.4 var(--sans); color: var(--faint); margin-top: 2px; }

/* Install */
.install { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 36px; }
.install .card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.install h3 { font: 700 19px/1.3 var(--serif); }
.install p, .install ol { margin-top: 10px; color: var(--muted); font-size: 15px; }
.install ol { padding-left: 1.2em; }
.install li + li { margin-top: 6px; }
pre {
    margin: 12px 0 0; padding: 14px 16px; background: #141c38; color: #e6ebff; border-radius: 12px;
    font: 13px/1.6 var(--mono); overflow-x: auto; white-space: pre;
}
pre .c { color: #8e9bc7; }
.req { margin-top: 18px; font-size: 14.5px; color: var(--muted); }

/* Open source */
.open { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 40px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: 24px; padding: 40px; margin-top: 8px; }
.open p { margin-top: 14px; color: var(--muted); }
.open .links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.open img { border-radius: 18px; }

footer { margin-top: 96px; padding: 34px 0 48px; border-top: 1px solid var(--line); color: var(--faint); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 10px 24px; justify-content: space-between; }
footer p + p { margin-top: 6px; }

/* ── Narrow screens ─────────────────────────────────────── */
@media (max-width: 960px) {
    .crew { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .people { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .install { grid-template-columns: minmax(0, 1fr); }
    .books { grid-template-columns: minmax(0, 1fr); }
    .feature, .feature.flip { grid-template-columns: minmax(0, 1fr); gap: 22px; }
    .feature.flip .text { order: 0; }
    .open { grid-template-columns: minmax(0, 1fr); padding: 28px; }
}
@media (max-width: 640px) {
    body { font-size: 16px; }
    .wrap, .cover { padding: 0 16px; }
    .nav-links { display: none; }
    .nav .wrap { gap: 10px; }
    .brand { margin-right: auto; }
    .hero { padding-top: 48px; }
    section { padding-top: 72px; }
    .crew, .grid, .shot-pair { grid-template-columns: minmax(0, 1fr); }
    .people { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .book { grid-template-columns: 96px minmax(0, 1fr); gap: 14px; padding: 14px; }
    .book img { width: 96px; }
    .cover img { border-radius: 16px; }
}

/* ── Every picture opens large ──────────────────────────── */
.zoomable { cursor: zoom-in; }
.lightbox {
    position: fixed; inset: 0; z-index: 50;
    display: flex; align-items: center; justify-content: center; gap: 14px;
    padding: 24px; background: rgba(10, 14, 30, 0.9);
}
.lightbox[hidden] { display: none; }
.lightbox figure { margin: 0; min-width: 0; max-width: min(1400px, 100%); display: flex; flex-direction: column; align-items: center; }
.lightbox img {
    width: auto; height: auto; max-width: 100%; max-height: calc(100vh - 120px);
    object-fit: contain; border-radius: 10px; background: #fff; box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5); cursor: default;
}
.lightbox figcaption { margin-top: 12px; max-width: 900px; color: #e8ecf8; font-size: 14.5px; line-height: 1.5; text-align: center; }
.lightbox button {
    flex: none; width: 44px; height: 44px; border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.28); background: rgba(255, 255, 255, 0.08);
    color: #fff; font: 400 26px/1 var(--sans); cursor: pointer;
}
.lightbox button:hover { background: rgba(255, 255, 255, 0.18); }
.lightbox .lb-close { position: absolute; top: 16px; right: 16px; }
body.lb-open { overflow: hidden; }
@media (max-width: 640px) {
    .lightbox { padding: 16px; }
    .lightbox .lb-prev, .lightbox .lb-next { position: absolute; bottom: 16px; }
    .lightbox .lb-prev { left: 16px; }
    .lightbox .lb-next { right: 16px; }
    .lightbox img { max-height: calc(100vh - 170px); }
}