/* ── Tokens ─────────────────────────────────────────────── */
:root {
  --bg: #fbfbfc;
  --surface: #ffffff;
  --surface-2: #f2f3f6;
  --text: #11131a;
  --muted: #555b6b;
  --faint: #8a90a0;
  --rule: #e3e5eb;
  --accent: #2443d6;
  --accent-soft: #e9edfd;
  --code-bg: #f2f3f6;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "IBM Plex Serif", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d0f14; --surface: #141720; --surface-2: #1a1e29; --text: #e8eaf0; --muted: #a3a9b8;
    --faint: #737a8b; --rule: #242938; --accent: #8ea2ff; --accent-soft: #1b2242; --code-bg: #1a1e29;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0d0f14; --surface: #141720; --surface-2: #1a1e29; --text: #e8eaf0; --muted: #a3a9b8;
  --faint: #737a8b; --rule: #242938; --accent: #8ea2ff; --accent-soft: #1b2242; --code-bg: #1a1e29;
  color-scheme: dark;
}

/* ── Base ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.65 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: clip; }
a { color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 40px; } }
.narrow { max-width: 720px; }

/* ── Header ─────────────────────────────────────────────── */
.site-head { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(12px); border-bottom: 1px solid var(--rule); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.brand { font-weight: 600; color: var(--text); text-decoration: none; letter-spacing: -.01em; display: inline-flex; align-items: center; gap: 10px; }
.brand-mark { width: 28px; height: 28px; border-radius: 7px; background: var(--text); color: var(--bg); display: grid; place-items: center; font: 600 .7rem/1 var(--mono); }
.site-nav { display: flex; gap: 22px; flex-wrap: wrap; font-size: .9rem; }
.site-nav a { color: var(--muted); text-decoration: none; }
.site-nav a:hover { color: var(--text); }
@media (max-width: 560px) { .site-nav .opt { display: none; } }

/* ── Hero ───────────────────────────────────────────────── */
.hero { padding: 80px 0 64px; }
.hero-grid { display: grid; gap: 40px; align-items: end; }
@media (min-width: 900px) { .hero-grid { grid-template-columns: 1.5fr 1fr; gap: 64px; } }
.role-line { font: 500 .82rem/1.4 var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .08em; margin: 0 0 22px; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.role-line .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.hero h1 { font-size: clamp(2.2rem, 5.2vw, 3.5rem); line-height: 1.08; letter-spacing: -.03em; margin: 0 0 22px; font-weight: 600; }
.hero h1 span { color: var(--faint); }
.hero .lead { font-size: 1.12rem; color: var(--muted); margin: 0; max-width: 34em; }
.facts { border-left: 2px solid var(--text); padding-left: 22px; display: grid; gap: 18px; margin: 0; }
.facts div { display: grid; gap: 2px; }
.facts dt { font: 500 .78rem/1.3 var(--mono); color: var(--faint); text-transform: uppercase; letter-spacing: .06em; }
.facts dd { margin: 0; font-weight: 500; }
.hero-links { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 34px; }
.btn { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; font-weight: 600; font-size: .93rem; padding: 12px 18px; border-radius: 8px; }
.btn-solid { background: var(--text); color: var(--bg); }
.btn-solid:hover { opacity: .88; }
.btn-line { color: var(--text); box-shadow: inset 0 0 0 1px var(--rule); background: var(--surface); }
.btn-line:hover { box-shadow: inset 0 0 0 1px var(--faint); }

/* ── Sections ───────────────────────────────────────────── */
section.block { padding: 72px 0; border-top: 1px solid var(--rule); }
.sec-head { display: grid; gap: 10px; margin-bottom: 40px; }
@media (min-width: 900px) { .sec-head { grid-template-columns: 1fr 1.5fr; gap: 64px; align-items: end; } }
.sec-head h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); line-height: 1.15; letter-spacing: -.02em; margin: 0; font-weight: 600; }
.sec-head p { margin: 0; color: var(--muted); }
.kicker { font: 500 .78rem/1 var(--mono); color: var(--accent); text-transform: uppercase; letter-spacing: .08em; margin: 0 0 12px; }

/* Case studies */
.cases { display: grid; gap: 16px; }
@media (min-width: 900px) { .cases { grid-template-columns: 1fr 1fr; } }
.case { background: var(--surface); border: 1px solid var(--rule); border-radius: 14px; padding: 26px 26px 24px; display: flex; flex-direction: column; gap: 14px; }
.case-top { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.case-no { font: 500 .8rem/1 var(--mono); color: var(--faint); }
.tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tags span { font: 500 .72rem/1 var(--mono); color: var(--muted); background: var(--surface-2); padding: 5px 8px; border-radius: 5px; }
.case h3 { font-size: 1.22rem; line-height: 1.3; margin: 0; letter-spacing: -.01em; font-weight: 600; }
.case dl { margin: 0; display: grid; gap: 12px; }
.case dt { font: 500 .74rem/1 var(--mono); color: var(--accent); text-transform: uppercase; letter-spacing: .07em; margin-bottom: 4px; }
.case dd { margin: 0; color: var(--muted); font-size: .97rem; }

/* Principles */
.principles { display: grid; gap: 0; border-top: 1px solid var(--rule); }
@media (min-width: 900px) { .principles { grid-template-columns: 1fr 1fr; } }
.pr { padding: 26px 0; border-bottom: 1px solid var(--rule); display: grid; grid-template-columns: 44px 1fr; gap: 6px 14px; }
@media (min-width: 900px) { .pr:nth-child(odd) { padding-right: 36px; } .pr:nth-child(even) { padding-left: 36px; border-left: 1px solid var(--rule); } }
.pr .n { font: 500 .85rem/1.6 var(--mono); color: var(--faint); }
.pr h3 { margin: 0 0 6px; font-size: 1.06rem; font-weight: 600; }
.pr p { margin: 0; color: var(--muted); font-size: .96rem; }

/* Timeline */
.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li { display: grid; grid-template-columns: 1fr; gap: 2px 32px; padding: 18px 0; border-bottom: 1px solid var(--rule); }
.timeline li:first-child { border-top: 1px solid var(--rule); }
@media (min-width: 760px) { .timeline li { grid-template-columns: 11rem 1fr auto; align-items: baseline; } }
.timeline .when { font: 500 .85rem/1.5 var(--mono); color: var(--faint); font-variant-numeric: tabular-nums; }
.timeline .what b { font-weight: 600; }
.timeline .what span { display: block; color: var(--muted); font-size: .95rem; }
.timeline .where { color: var(--muted); font-size: .92rem; }

.contact { display: grid; gap: 28px; }
@media (min-width: 900px) { .contact { grid-template-columns: 1fr 1.5fr; gap: 64px; } }
.contact h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); line-height: 1.15; letter-spacing: -.02em; margin: 0; font-weight: 600; }
.contact p { margin: 0 0 22px; color: var(--muted); }
.contact-line { display: flex; gap: 12px; flex-wrap: wrap; }

.site-foot { border-top: 1px solid var(--rule); padding: 28px 0 44px; color: var(--faint); font-size: .85rem; }
.site-foot .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; align-items: center; }
.theme-toggle { background: none; border: 1px solid var(--rule); color: var(--muted); border-radius: 6px; font: inherit; font-size: .8rem; padding: 5px 10px; cursor: pointer; }
.theme-toggle:hover { color: var(--text); border-color: var(--faint); }

/* ── Article (for future texts) ─────────────────────────── */
.article-head { padding: 56px 0 32px; }
.article-head .kicker { margin-bottom: 14px; }
.article-head h1 { font-size: clamp(1.8rem, 4.5vw, 2.6rem); line-height: 1.18; letter-spacing: -.02em; margin: 0 0 16px; font-weight: 600; }
.article-head .standfirst { font-size: 1.15rem; color: var(--muted); margin: 0; }
.prose { font-family: var(--serif); font-size: 1.06rem; line-height: 1.75; padding-bottom: 24px; }
.prose h2 { font-family: var(--sans); font-size: 1.35rem; line-height: 1.3; margin: 48px 0 12px; letter-spacing: -.01em; font-weight: 600; }
.prose h3 { font-family: var(--sans); font-size: 1.05rem; margin: 32px 0 8px; font-weight: 600; }
.prose p, .prose ul, .prose ol { margin: 0 0 18px; }
.prose code { font-family: var(--mono); font-size: .86em; background: var(--code-bg); padding: 1px 5px; border-radius: 3px; overflow-wrap: anywhere; }
.prose pre { font-family: var(--mono); font-size: .82rem; line-height: 1.6; background: var(--code-bg); padding: 16px 18px; border-radius: 8px; overflow-x: auto; margin: 0 0 22px; }
.prose pre code { background: none; padding: 0; }
.prose blockquote { margin: 0 0 22px; padding: 4px 0 4px 18px; border-left: 3px solid var(--accent); color: var(--muted); }

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