/* python-multiplatform guide — shared thisisthepy tokens, accent #3b6cff */
:root {
  --bg: #fbfbfa; --fg: #16181d; --muted: #5b6270; --line: #e6e6e3; --code-bg: #f3f3f1;
  --radius: 10px; --maxw: 72rem;
  --font-sans: "Inter", "IBM Plex Sans KR", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --accent: #3b6cff; --accent-soft: rgba(59, 108, 255, .10); --surface: #ffffff;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg: #0f1115; --fg: #e8e9ec; --muted: #9aa1ad; --line: #252a33; --code-bg: #161a21;
  --accent: #6d8fff; --accent-soft: rgba(109, 143, 255, .14); --surface: #13161b; color-scheme: dark; } }
:root[data-theme="dark"] {
  --bg: #0f1115; --fg: #e8e9ec; --muted: #9aa1ad; --line: #252a33; --code-bg: #161a21;
  --accent: #6d8fff; --accent-soft: rgba(109, 143, 255, .14); --surface: #13161b; color-scheme: dark; }

/* language switching: only the active language is shown */
html[lang="en"] [data-lang="ko"], html[lang="ko"] [data-lang="en"] { display: none !important; }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.65 var(--font-sans); font-feature-settings: "cv11", "ss01";
  overflow-x: hidden;
}
html[lang="ko"] body { word-break: keep-all; line-height: 1.75; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
code, pre { font-family: var(--font-mono); font-size: .88em; }
:not(pre) > code { background: var(--code-bg); padding: .1em .35em; border-radius: 5px; overflow-wrap: anywhere; }
pre {
  background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1rem 1.1rem; overflow-x: auto; line-height: 1.55; margin: 1.1rem 0;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

/* header */
.site-header { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px); -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; gap: 1rem; min-height: 60px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: .55rem; color: var(--fg); font-weight: 650; letter-spacing: -.01em; }
.brand:hover { text-decoration: none; }
.brand .mark { width: 22px; height: 22px; flex: none; }
.nav { display: flex; gap: .2rem; flex-wrap: wrap; margin-left: auto; }
.nav a { color: var(--muted); padding: .35rem .6rem; border-radius: 8px; font-size: .93rem; }
.nav a:hover { color: var(--fg); background: var(--accent-soft); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--fg); font-weight: 600; }
.tools { display: flex; gap: .4rem; }
.tool { font: inherit; font-size: .85rem; color: var(--fg); background: transparent; border: 1px solid var(--line);
  border-radius: 8px; padding: .3rem .6rem; cursor: pointer; min-width: 2.4rem; }
.tool:hover { border-color: var(--accent); }
.menu-toggle { display: none; }
@media (max-width: 820px) {
  .menu-toggle { display: inline-block; margin-left: auto; }
  .nav { display: none; width: 100%; order: 3; flex-direction: column; padding: .3rem 0 .8rem; margin-left: 0; }
  .nav.open { display: flex; }
  .tools { order: 2; }
}

/* hero */
.hero { padding: 4.5rem 0 3rem; border-bottom: 1px solid var(--line); }
.eyebrow { font: 500 .8rem/1 var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.hero h1 { font-size: clamp(2rem, 5.2vw, 3.5rem); line-height: 1.12; letter-spacing: -.03em; margin: 1rem 0 1.2rem; font-weight: 700; max-width: 22ch; }
html[lang="ko"] .hero h1 { letter-spacing: -.02em; max-width: 20ch; }
.hero p.lead { font-size: clamp(1.05rem, 2vw, 1.2rem); color: var(--muted); max-width: 46rem; margin: 0 0 2rem; }
.cta { display: flex; gap: .7rem; flex-wrap: wrap; }
.btn { display: inline-block; padding: .65rem 1.1rem; border-radius: 9px; border: 1px solid var(--line); color: var(--fg); font-weight: 550; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn:hover { text-decoration: none; border-color: var(--accent); }

/* content */
main { padding: 2.5rem 0 4rem; }
.page-head { padding: 3rem 0 1.5rem; border-bottom: 1px solid var(--line); margin-bottom: 2rem; }
.page-head h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); letter-spacing: -.025em; margin: .6rem 0 .6rem; line-height: 1.2; }
.page-head p { color: var(--muted); max-width: 46rem; margin: 0; }
.prose { max-width: 46rem; }
.prose h2 { font-size: 1.45rem; letter-spacing: -.015em; margin: 2.8rem 0 .8rem; line-height: 1.3; }
.prose h3 { font-size: 1.1rem; margin: 2rem 0 .5rem; }
.prose p, .prose li { color: var(--fg); }
.prose .muted { color: var(--muted); }
h2 .num { font: 500 .8rem var(--font-mono); color: var(--accent); margin-right: .6rem; vertical-align: .2em; }

.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr)); margin: 1.5rem 0; }
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 1.2rem 1.25rem; background: var(--surface); }
.card h3 { margin: 0 0 .4rem; font-size: 1.02rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
a.card { color: inherit; display: block; transition: border-color .15s; }
a.card:hover { border-color: var(--accent); text-decoration: none; }

.principles { counter-reset: p; list-style: none; padding: 0; margin: 1.5rem 0; display: grid; gap: 0; }
.principles li { counter-increment: p; display: grid; grid-template-columns: 2.6rem 1fr; gap: .5rem; padding: 1.1rem 0; border-top: 1px solid var(--line); }
.principles li::before { content: counter(p, decimal-leading-zero); font: 500 .85rem/1.9 var(--font-mono); color: var(--accent); }
.principles strong { display: block; margin-bottom: .15rem; }
.principles span.d { color: var(--muted); }

.table-wrap { overflow-x: auto; margin: 1.2rem 0; border: 1px solid var(--line); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
th, td { text-align: left; padding: .6rem .85rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; color: var(--muted); font-size: .82rem; text-transform: uppercase; letter-spacing: .04em; }
tr:last-child td { border-bottom: 0; }
.pill { display: inline-block; font: 500 .75rem/1.5 var(--font-mono); padding: .05rem .5rem; border-radius: 999px; border: 1px solid var(--line); white-space: nowrap; }
.pill.ok { color: #0f9d76; border-color: color-mix(in srgb, #0f9d76 40%, transparent); }
.pill.part { color: #b7791f; border-color: color-mix(in srgb, #b7791f 40%, transparent); }
.pill.plan { color: var(--muted); }

.note { border-left: 3px solid var(--accent); background: var(--accent-soft); padding: .8rem 1rem; border-radius: 0 var(--radius) var(--radius) 0; margin: 1.2rem 0; }
.note p { margin: 0; }

figure.diagram { margin: 2.5rem 0 1rem; }
figure.diagram svg { width: 100%; height: auto; display: block; }
figure.diagram figcaption { color: var(--muted); font-size: .9rem; margin-top: .6rem; }
.d-box { fill: var(--surface); stroke: var(--line); stroke-width: 1.5; }
.d-box.accent { stroke: var(--accent); }
.d-label { fill: var(--fg); font: 600 15px var(--font-sans); }
.d-sub { fill: var(--muted); font: 400 12.5px var(--font-mono); }
.d-line { stroke: var(--accent); stroke-width: 2; fill: none; }
.d-line.muted { stroke: var(--muted); stroke-dasharray: 4 4; }
.d-arrow { fill: var(--accent); }
.d-tag { fill: var(--accent); font: 500 12px var(--font-mono); }

.pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line); flex-wrap: wrap; }
.site-footer { border-top: 1px solid var(--line); padding: 2rem 0 3rem; color: var(--muted); font-size: .9rem; }
.site-footer .wrap { display: flex; gap: 1rem; justify-content: space-between; flex-wrap: wrap; }
@media (max-width: 420px) {
  .bar { gap: .5rem; }
  .brand { font-size: .95rem; }
  .tool { padding: .3rem .45rem; }
  .hero { padding: 3rem 0 2rem; }
}