:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --panel: #ffffff;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --faint: #86868b;
  --line: #e5e5ea;
  --accent: #0a66e8;
  --accent-ink: #ffffff;
  --shot-shadow: 0 30px 80px -30px rgba(0, 0, 0, .28), 0 0 0 1px rgba(0, 0, 0, .06);
  --nav-bg: rgba(255, 255, 255, .78);
  --kbd-bg: #ffffff;
  --kbd-edge: #d2d2d7;
}

[data-theme="dark"] {
  --bg: #000000;
  --bg-alt: #0d0d0f;
  --panel: #161618;
  --ink: #f5f5f7;
  --muted: #a1a1a6;
  --faint: #6e6e73;
  --line: #26262a;
  --accent: #3b8bff;
  --accent-ink: #ffffff;
  --shot-shadow: 0 30px 90px -30px rgba(0, 0, 0, .9), 0 0 0 1px rgba(255, 255, 255, .08);
  --nav-bg: rgba(0, 0, 0, .7);
  --kbd-bg: #1d1d20;
  --kbd-edge: #3a3a3e;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", Inter, "Segoe UI", system-ui, sans-serif;
  background: var(--bg); color: var(--ink); line-height: 1.5; letter-spacing: -.005em;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
a { color: inherit; }
a.link, .prose a { color: var(--accent); text-decoration: none; }
a.link:hover, .prose a:hover { text-decoration: underline; }
code, kbd, pre { font-family: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace; }
.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding-left: 32px; padding-right: 32px; }
.wide { max-width: 1280px; }
img { max-width: 100%; height: auto; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

h1, h2, h3 { font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", Inter, "Segoe UI", system-ui, sans-serif; letter-spacing: -.022em; }
.eyebrow { font-size: 15px; font-weight: 600; color: var(--accent); }
.sec-h { font-size: 44px; line-height: 1.08; font-weight: 700; margin-top: 8px; max-width: 24ch; }
.sec-sub { margin-top: 14px; font-size: 19px; color: var(--muted); max-width: 52ch; }
section { padding: 112px 0; }
.alt { background: var(--bg-alt); }

/* ── Nav ── */
nav { position: sticky; top: 0; z-index: 100; background: var(--nav-bg); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); border-bottom: 1px solid var(--line); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 52px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 600; font-size: 15px; text-decoration: none; }
.brand img { width: 22px; height: 22px; border-radius: 5px; background: #fff; box-shadow: 0 0 0 1px rgba(0, 0, 0, .08); }
.nav-right { display: flex; align-items: center; gap: 24px; }
.nav-links { display: flex; gap: 24px; font-size: 13px; color: var(--muted); }
.nav-links a { text-decoration: none; transition: color .15s; }
.nav-links a:hover { color: var(--ink); }
.theme-btn, .lang-btn { background: none; border: 0; cursor: pointer; color: var(--muted); font-size: 15px; width: 32px; height: 32px; display: inline-flex; align-items: center; justify-content: center; }
.theme-btn:hover, .lang-btn:hover { color: var(--ink); }
.lang-btn { width: auto; min-width: 32px; gap: 6px; font-size: 13px; }
.lang-btn svg { width: 17px; height: 17px; }
.nav-dl { white-space: nowrap; font-size: 12.5px; font-weight: 500; padding: 5px 13px; border-radius: 980px; background: var(--accent); color: var(--accent-ink); text-decoration: none; }
.nav-dl:hover { filter: brightness(1.08); }
@media (max-width: 860px) { .nav-links { display: none; } }

/* ── Hero ── */
.hero { text-align: center; padding-top: 88px; }
.hero-icon { width: 104px; height: 104px; border-radius: 23px; background: #fff; box-shadow: 0 0 0 1px rgba(0, 0, 0, .06), 0 14px 32px -10px rgba(10, 40, 120, .35); }
[data-theme="dark"] .hero-icon { box-shadow: 0 0 0 1px rgba(255, 255, 255, .1), 0 14px 36px -10px rgba(59, 139, 255, .35); }
h1 { font-size: 76px; line-height: 1.02; font-weight: 700; margin-top: 26px; letter-spacing: -.035em; }
.lede { margin: 22px auto 0; font-size: 22px; line-height: 1.4; color: var(--muted); max-width: 40ch; }
.cta { margin-top: 34px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; text-decoration: none; font-weight: 500; font-size: 16px; padding: 12px 24px; border-radius: 980px; transition: filter .15s, background .15s; }
.btn-p { background: var(--accent); color: var(--accent-ink); }
.btn-p:hover { filter: brightness(1.08); }
.btn-o { color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.btn-o:hover { background: color-mix(in srgb, var(--accent) 8%, transparent); }
.meta { margin-top: 18px; font-size: 13px; color: var(--faint); }
.hero-shot { position: relative; margin: 64px auto 0; max-width: 1280px; border-radius: 14px; overflow: hidden; box-shadow: var(--shot-shadow); }
.hero-shot img { display: block; width: 100%; cursor: pointer; }
.play-btn { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); display: inline-flex; align-items: center; gap: 10px; padding: 12px 20px 12px 16px; border-radius: 980px; border: 0; cursor: pointer; white-space: nowrap;
  font: 500 15px -apple-system, BlinkMacSystemFont, Inter, sans-serif; color: #fff; background: rgba(20, 20, 22, .62); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, .5), inset 0 0 0 1px rgba(255, 255, 255, .14); transition: transform .15s, background .15s; }
.play-btn:hover { transform: translate(-50%, -50%) scale(1.04); background: rgba(20, 20, 22, .74); }
.play-btn svg { flex: none; }

/* ── Tour ── */
.tour { margin: auto; border: 0; padding: 0; background: transparent; width: min(1200px, 94vw, (100dvh - 7rem) * 2560 / 1300); max-width: none; overflow: visible; }
.tour::backdrop { background: rgba(0, 0, 0, .78); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.tour-frame { position: relative; overflow: hidden; border-radius: 12px; background: var(--panel); aspect-ratio: 2560 / 1300; box-shadow: 0 40px 120px -40px rgba(0, 0, 0, .6); }
.tour-stage { position: absolute; inset: 0; transition: transform .9s cubic-bezier(.4, 0, .2, 1), transform-origin .9s cubic-bezier(.4, 0, .2, 1); }
.tour-stage video { display: block; width: 100%; height: 100%; }
.tour-cursor { position: absolute; left: 0; top: 0; width: 1.6%; min-width: 12px; pointer-events: none; transform: translate(-12%, -6%); filter: drop-shadow(0 1px 1.5px rgba(0, 0, 0, .35)); }
.tour-ripple { position: absolute; width: 3.2%; aspect-ratio: 1; border-radius: 50%; border: 2px solid var(--accent); pointer-events: none; opacity: 0; }
.tour-ripple.on { animation: tour-ripple .45s ease-out; }
@media (prefers-reduced-motion: reduce) { .tour-stage { transition: none; } }
@keyframes tour-ripple { from { opacity: .9; transform: translate(-50%, -50%) scale(.3); } to { opacity: 0; transform: translate(-50%, -50%) scale(1.4); } }
.tour-bar { display: flex; align-items: center; gap: 10px; margin-top: 16px; color: #f5f5f7; font-size: 14px; }
.tour-cap { flex: 1; display: flex; align-items: center; gap: 12px; min-height: 32px; font-size: 20px; font-weight: 600; letter-spacing: -.01em; color: #fff; text-shadow: 0 1px 12px rgba(0, 0, 0, .6); }
.tour-cap .n { flex: none; padding: 3px 10px; border-radius: 980px; background: #0a66e8; font: 600 13px -apple-system, BlinkMacSystemFont, Inter, sans-serif; font-variant-numeric: tabular-nums; text-shadow: none; animation: tour-step .35s ease-out; }
@keyframes tour-step { from { opacity: 0; transform: translateY(4px); } }
@media (max-width: 600px) { .tour-cap { font-size: 16px; gap: 8px; } }
.tour-bar button { font: 500 13px -apple-system, BlinkMacSystemFont, Inter, sans-serif; color: #f5f5f7; background: rgba(255, 255, 255, .1); border: 0; border-radius: 980px; padding: 6px 14px; cursor: pointer; }
.tour-bar button:hover { background: rgba(255, 255, 255, .18); }
.tour-bar button[aria-pressed="true"] { background: #f5f5f7; color: #000; }

/* ── Pillars ── */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; padding: 96px 0 0; text-align: left; }
.pillar h3 { font-size: 19px; font-weight: 600; margin-bottom: 6px; }
.pillar p { font-size: 15.5px; color: var(--muted); }

/* ── Showcase ── */
.spot { text-align: center; }
.spot .sec-h, .spot .sec-sub { margin-left: auto; margin-right: auto; }
.spot .show-img { margin-top: 56px; }
.show { display: grid; grid-template-columns: 5fr 7fr; gap: 64px; align-items: center; margin-top: 128px; }
.show.rev { grid-template-columns: 7fr 5fr; }
.show.rev .show-text { order: 2; }
.show-text h3 { font-size: 34px; line-height: 1.12; font-weight: 700; margin-top: 6px; }
.show-text p { margin-top: 14px; font-size: 17px; color: var(--muted); }
.show-text strong { color: var(--ink); font-weight: 600; }
.show-text .note { font-size: 13px; color: var(--faint); }
.show-img { position: relative; border-radius: 12px; overflow: hidden; box-shadow: var(--shot-shadow); }
.show-img img, .show-img video { display: block; width: 100%; height: auto; }
.loop-stage { position: relative; }
.loop-cap { display: flex; align-items: center; gap: 10px; min-height: 48px; padding: 10px 16px; border-top: 1px solid var(--line); background: var(--panel); font-size: 16px; font-weight: 600; letter-spacing: -.01em; text-align: left; }
.loop-cap .n { flex: none; padding: 2px 9px; border-radius: 980px; background: var(--accent); color: #fff; font-size: 12px; font-variant-numeric: tabular-nums; animation: tour-step .35s ease-out; }
code { font-size: .86em; padding: 1px 6px; border-radius: 5px; background: var(--bg-alt); color: var(--ink); }
.alt code { background: var(--panel); }
@media (max-width: 860px) {
  .show, .show.rev { grid-template-columns: 1fr; gap: 28px; margin-top: 88px; }
  .show.rev .show-text { order: 0; }
}

/* ── More ── */
.more { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px 32px; margin-top: 56px; }
.more svg { width: 26px; height: 26px; color: var(--accent); }
.more h3 { font-size: 16px; font-weight: 600; margin: 12px 0 4px; }
.more p { font-size: 14.5px; color: var(--muted); }
.guide-link { margin-top: 56px; font-size: 17px; }
@media (max-width: 960px) { .more { grid-template-columns: repeat(2, 1fr); } }

/* ── Keyboard ── */
.keys-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center; margin-top: 56px; }
.keys-list { list-style: none; }
.keys-list li { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 15.5px; }
.keys-list li:first-child { border-top: 1px solid var(--line); }
kbd { display: inline-flex; align-items: center; justify-content: center; min-width: 24px; height: 24px; padding: 0 7px; font-size: 12.5px; font-family: -apple-system, BlinkMacSystemFont, Inter, sans-serif; color: var(--ink);
  background: var(--kbd-bg); border-radius: 6px; box-shadow: inset 0 0 0 1px var(--kbd-edge), 0 1px 0 var(--kbd-edge); }
.combo { display: inline-flex; gap: 4px; flex: none; }
.palette-shot { display: flex; justify-content: center; }
.palette-shot img { display: block; width: 100%; max-width: 520px; border-radius: 14px; box-shadow: var(--shot-shadow); }
@media (max-width: 860px) { .keys-layout { grid-template-columns: 1fr; gap: 40px; } }

/* ── Install ── */
.install-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin-top: 56px; }
.card { background: var(--panel); border-radius: 18px; padding: 30px 32px; box-shadow: 0 0 0 1px var(--line); }
.card h3 { font-size: 21px; font-weight: 600; }
.card .req { margin-top: 4px; font-size: 14px; color: var(--muted); }
.card pre { margin-top: 22px; font-size: 13px; line-height: 1.8; overflow-x: auto; color: var(--ink); }
.card pre .c { color: var(--faint); }
.card pre .p { color: var(--accent); user-select: none; }
.card .after { margin-top: 18px; font-size: 14px; color: var(--muted); }
@media (max-width: 860px) { .install-grid { grid-template-columns: minmax(0, 1fr); } }

/* ── Story ── */
.story { text-align: center; }
.story .sec-h { margin-left: auto; margin-right: auto; }
.story-body { max-width: 640px; margin: 28px auto 0; }
.story-body p { font-size: 19px; line-height: 1.55; color: var(--muted); margin-top: 18px; }
.story-body strong { color: var(--ink); font-weight: 600; }

/* ── FAQ ── */
.faq-list { margin-top: 48px; }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list details:first-child { border-top: 1px solid var(--line); }
.faq-list summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 20px 0; font-size: 18px; font-weight: 600; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; flex: none; font-size: 24px; font-weight: 300; color: var(--muted); transition: transform .2s; }
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list details p { padding: 0 40px 24px 0; font-size: 16px; color: var(--muted); }

/* ── Blog ── */
.posts { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 48px; }
.post-card { display: block; padding: 28px 30px; border-radius: 18px; background: var(--panel); box-shadow: 0 0 0 1px var(--line); text-decoration: none; transition: box-shadow .15s; }
.post-card:hover { box-shadow: 0 0 0 1px var(--accent); }
.post-card time { font-size: 13px; color: var(--faint); }
.post-card h3 { font-size: 21px; font-weight: 600; margin: 6px 0 8px; line-height: 1.25; }
.post-card p { font-size: 15px; color: var(--muted); }
@media (max-width: 760px) { .posts { grid-template-columns: 1fr; } }

/* ── Footer ── */
footer { border-top: 1px solid var(--line); padding: 32px 0 48px; font-size: 13px; color: var(--muted); }
.foot { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 22px; }
.foot a { text-decoration: none; }
.foot a:hover { color: var(--ink); }
.foot .spons a { color: var(--accent); }

/* Theme-scoped so these beat `.hero-shot img`/`.show-img img` (0,1,1). data-theme is set in <head> before paint. */
[data-theme="dark"] .light-only, [data-theme="light"] .dark-only { display: none; }
[data-theme="dark"] .dark-only, [data-theme="light"] .light-only { display: block; }

@media (max-width: 860px) {
  section { padding: 80px 0; }
  h1 { font-size: 56px; }
  .sec-h { font-size: 36px; }
  .pillars { grid-template-columns: 1fr; gap: 28px; padding-top: 72px; }
}

@media (max-width: 600px) {
  .wrap { padding-left: 20px; padding-right: 20px; }
  section { padding: 64px 0; }
  .hero { padding-top: 56px; }
  .hero-icon { width: 76px; height: 76px; border-radius: 17px; }
  h1 { font-size: 40px; line-height: 1.06; }
  .lede { font-size: 18px; }
  .cta { flex-direction: column; align-items: stretch; }
  .btn { min-height: 48px; }
  .hero-shot { margin-top: 44px; border-radius: 10px; }
  .play-btn { padding: 10px 14px 10px 12px; font-size: 13px; }
  .sec-h { font-size: 30px; }
  .sec-sub { font-size: 17px; }
  .show-text h3 { font-size: 27px; }
  .show-text p { font-size: 16px; }
  .show, .show.rev { margin-top: 64px; }
  .show-img { border-radius: 8px; }
  .more { grid-template-columns: 1fr; gap: 22px; }
  .more > div { display: grid; grid-template-columns: 26px 1fr; column-gap: 14px; }
  .more svg { grid-row: span 2; margin-top: 1px; }
  .more h3 { margin-top: 0; }
  .foot-links { display: grid; grid-template-columns: repeat(3, auto); justify-content: start; gap: 10px 28px; }
  .card { padding: 24px 20px; }
  .card pre { font-size: 12px; white-space: pre-wrap; overflow-wrap: anywhere; }
  .story-body p { font-size: 17px; }
  .faq-list summary { font-size: 16.5px; }
  .faq-list details p { padding-right: 0; font-size: 15px; }
}

/* ── Language menu ── */
.lang-menu { position: fixed; inset: 56px 16px auto auto; margin: 0; padding: 6px; width: 132px; border: 0; border-radius: 12px; background: var(--panel); color: var(--ink); box-shadow: var(--shot-shadow); }
.lang-menu a { display: block; padding: 7px 12px; border-radius: 7px; font-size: 14px; text-align: center; text-decoration: none; }
.lang-menu a:hover { background: var(--bg-alt); }
.lang-menu a[aria-current] { color: var(--accent); font-weight: 600; }
@media (max-width: 600px) { .nav-right { gap: 12px; } }
@media (max-width: 420px) { .lang-now { display: none; } }

/* ── CJK pages ── */
:lang(ja) { --cjk: "Hiragino Sans", "Yu Gothic UI", "Noto Sans CJK JP", "Noto Sans JP"; }
:lang(zh-Hans) { --cjk: "PingFang SC", "Microsoft YaHei UI", "Noto Sans CJK SC", "Noto Sans SC"; }
:lang(zh-Hant) { --cjk: "PingFang TC", "Microsoft JhengHei UI", "Noto Sans CJK TC", "Noto Sans TC"; }
.cjk, .cjk h1, .cjk h2, .cjk h3 { font-family: -apple-system, BlinkMacSystemFont, Inter, "Segoe UI", var(--cjk), system-ui, sans-serif; letter-spacing: normal; }
.cjk { line-height: 1.7; }
.cjk h1 { line-height: 1.15; font-weight: 700; }
.cjk .sec-h { line-height: 1.25; max-width: 18em; }
.cjk .sec-sub { max-width: 34em; }
.cjk .lede { max-width: 26em; line-height: 1.6; }
.cjk .show-text h3 { line-height: 1.3; }
.cjk h1, .cjk .sec-h, .cjk .sec-sub, .cjk .lede, .cjk .show-text h3 { text-wrap: balance; }
:lang(ja) h1, :lang(ja) h2, :lang(ja) h3, :lang(ja) .sec-sub, :lang(ja) .lede { word-break: auto-phrase; }