:root {
  color-scheme: light;
  --bg: #fbfbfa; --surface: #ffffff; --surface-2: #f3f2ef; --border: #e4e3de;
  --text: #0e0e0d; --text-2: #4d4c48; --muted: #7a7974;
  --accent: #5a45d6; --accent-ink: #ffffff; --accent-soft: #eeebfc;
  --warm: #b4541d; --warm-soft: #fbeee5;
  --code-bg: #0f1115; --code-text: #e6e6e3; --code-muted: #8b8f98; --code-user: #b8a8ff; --code-ok: #9fd88f;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.06);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0d0d0c; --surface: #161615; --surface-2: #1d1d1b; --border: #2c2c29;
    --text: #f1f0ec; --text-2: #c4c3ba; --muted: #8f8e86;
    --accent: #9d8cff; --accent-ink: #0d0d0c; --accent-soft: #1f1a3a;
    --warm: #f0a070; --warm-soft: #2b1d14;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0d0d0c; --surface: #161615; --surface-2: #1d1d1b; --border: #2c2c29;
  --text: #f1f0ec; --text-2: #c4c3ba; --muted: #8f8e86;
  --accent: #9d8cff; --accent-ink: #0d0d0c; --accent-soft: #1f1a3a;
  --warm: #f0a070; --warm-soft: #2b1d14;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, monospace; }
:not(pre) > code { font-size: .9em; background: var(--surface-2); border: 1px solid var(--border); padding: 1px 6px; border-radius: 6px; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.grid2 > *, .grid3 > *, .grid4 > *, .hero-grid > *, .lanes > * { min-width: 0; }

header.nav { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.nav .wrap { display: flex; align-items: center; gap: 22px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--text); font-size: 19px; letter-spacing: -.01em; }
.brand:hover { text-decoration: none; }
.logo { width: 26px; height: 26px; border-radius: 7px; background: var(--accent); display: grid; place-items: center; flex: none; }
.nav nav { display: flex; gap: 18px; margin-left: auto; font-size: 15px; align-items: center; }
.nav nav a { color: var(--text-2); }
.nav nav a:hover { color: var(--text); text-decoration: none; }
.nav nav a.lang { border: 1px solid var(--border); border-radius: 8px; padding: 2px 8px; font-size: 13px; font-weight: 600; }
@media (max-width: 820px) { .nav nav a:not(.keep) { display: none; } }

.hero { padding: 76px 0 60px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; gap: 32px; } .hero { padding: 48px 0 40px; } }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: var(--accent); background: var(--accent-soft); padding: 4px 12px; border-radius: 999px; margin-bottom: 18px; }
h1 { font-size: clamp(36px, 6vw, 60px); line-height: 1.04; letter-spacing: -0.03em; margin: 0 0 18px; }
h1 .hl { color: var(--accent); }
.lead { font-size: 19px; color: var(--text-2); margin: 0 0 28px; max-width: 32em; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 10px; font-weight: 600; font-size: 15px; border: 1px solid var(--border); color: var(--text); background: var(--surface); }
.btn:hover { text-decoration: none; border-color: var(--muted); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.06); }
.slogans { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 24px; color: var(--muted); font-size: 14px; font-weight: 600; }

.term { background: var(--code-bg); color: var(--code-text); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; border: 1px solid #23262d; }
.term-bar { display: flex; align-items: center; gap: 7px; padding: 11px 14px; border-bottom: 1px solid #23262d; }
.term-bar i { width: 11px; height: 11px; border-radius: 50%; background: #3a3e47; display: block; }
.term-bar b { margin-left: 8px; font-weight: 500; font-size: 12px; color: var(--code-muted); }
.term pre { margin: 0; padding: 16px 18px 18px; font-size: 13px; line-height: 1.65; overflow-x: auto; white-space: pre; }
.u { color: var(--code-user); } .p { color: var(--code-muted); } .ok { color: var(--code-ok); }

section { padding: 68px 0; }
section.alt { background: var(--surface-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
h2 { font-size: clamp(26px, 3.6vw, 36px); letter-spacing: -0.02em; line-height: 1.12; margin: 0 0 12px; }
.sub { color: var(--text-2); font-size: 17px; margin: 0 0 36px; max-width: 46em; }

.layers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 760px) { .layers { grid-template-columns: 1fr; } }
.layer { border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; background: var(--surface); }
.layer .k { font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 700; }
.layer b { display: block; font-size: 22px; margin: 4px 0; letter-spacing: -.01em; }
.layer span { color: var(--text-2); }
.layer.now { border: 2px solid var(--accent); }
.layer.now b { color: var(--accent); }

.lanes { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 860px) { .lanes { grid-template-columns: 1fr; } }
.lane { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.lane h3 { margin: 0 0 16px; font-size: 17px; }
.flow { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.step { border: 1px solid var(--border); background: var(--surface-2); border-radius: 9px; padding: 7px 11px; font-size: 14px; }
.arrow { color: var(--muted); font-weight: 700; }
.lane.old .step.slow { background: var(--warm-soft); border-color: color-mix(in srgb, var(--warm) 40%, var(--border)); color: var(--warm); font-weight: 600; }
.lane.new { border: 2px solid var(--accent); }
.lane.new .step.fast { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); color: var(--accent); font-weight: 600; }
.lane p { margin: 16px 0 0; color: var(--text-2); font-size: 15px; }

table.cmp { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; font-size: 15px; }
table.cmp th, table.cmp td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--border); vertical-align: top; }
table.cmp thead th { background: var(--surface-2); font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
table.cmp td:first-child { color: var(--text-2); }
table.cmp td:last-child { font-weight: 600; }
table.cmp tr:last-child td { border-bottom: 0; }
.tablewrap { overflow-x: auto; }

.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 900px) { .grid4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .grid4 { grid-template-columns: 1fr; } }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 900px) { .grid3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid3 { grid-template-columns: 1fr; } }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 860px) { .grid2 { grid-template-columns: 1fr; } }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.card .ic { font-size: 22px; line-height: 1; margin-bottom: 12px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--text-2); font-size: 15px; }

ol.principles { counter-reset: p; list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 900px) { ol.principles { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { ol.principles { grid-template-columns: 1fr; } }
ol.principles li { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 16px 16px 54px; position: relative; color: var(--text-2); font-size: 15px; }
ol.principles li::before { counter-increment: p; content: counter(p); position: absolute; left: 16px; top: 16px; width: 26px; height: 26px; border-radius: 8px; background: var(--accent-soft); color: var(--accent); font-weight: 700; font-size: 13px; display: grid; place-items: center; }
ol.principles li b { display: block; color: var(--text); }

ul.plain { margin: 0; padding-left: 20px; color: var(--text-2); display: grid; gap: 8px; }
ul.plain b { color: var(--text); }
.install pre { background: var(--code-bg); color: var(--code-text); border-radius: 10px; padding: 14px 16px; font-size: 13px; overflow-x: auto; margin: 8px 0 18px; border: 1px solid #23262d; }
.install h3 { margin: 0 0 4px; font-size: 16px; }
.install p { margin: 0; color: var(--text-2); font-size: 15px; }

.road { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; counter-reset: r; }
@media (max-width: 760px) { .road { grid-template-columns: 1fr; } }
.road div { border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; background: var(--surface); }
.road div.cur { border: 2px solid var(--accent); }
.road .tag { font-size: 12px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: .06em; }
.road h3 { margin: 4px 0 6px; font-size: 18px; }
.road p { margin: 0; color: var(--text-2); font-size: 15px; }

.quote { font-size: clamp(22px, 3vw, 30px); font-weight: 700; letter-spacing: -.015em; line-height: 1.25; margin: 0; max-width: 30em; }
.quote span { color: var(--accent); }

footer { padding: 40px 0 56px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--border); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 28px; justify-content: space-between; }
footer p { margin: 0; max-width: 46em; }
footer nav { display: flex; gap: 18px; flex-wrap: wrap; }