/* Blog index and articles (site/blog.html, site/blog/*.html). Same palette and type rules as
   the landing page: weight 500 base, nothing under ~13px, one primary CTA per screen. */
:root {
  color-scheme: dark;
  --ink: #14101a;
  --ink-2: #1f1828;
  --ink-3: #2c2338;
  --line: #3a3047;
  --lav: #c6b2ee;
  --lav-dim: #8f7cb8;
  --sign: #f3c63f;
  --sign-deep: #a37d10;
  --sign-ink: #1a1405;
  --pink: #ff4fa3;
  --cyan: #4fe3ff;
  --red: #ff4766;
  --violet: #b48cff;
  --text: #efeaf6;
  --soft: #d9d1e4;
  --mute: #a197b0;
  --body: "Zen Kaku Gothic New", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  --display: "Dela Gothic One", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  --mono: "DM Mono", ui-monospace, Menlo, monospace;
  --gutter: clamp(16px, 4vw, 40px);
}
* { box-sizing: border-box; }
html { font-synthesis: none; }  /* no faux bold for single-weight faces (Dela Gothic One) */
body { margin: 0; background: var(--ink); color: var(--text); font-family: var(--body); font-size: 18px; line-height: 1.8; font-weight: 500; }
a { color: var(--lav); text-underline-offset: 3px; }
a:hover { color: var(--text); }
:focus-visible { outline: 2px solid var(--sign); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { text-wrap: balance; }

/* ---------- top bar ---------- */
.bar { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10; background: color-mix(in srgb, var(--ink) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.bar .in { max-width: 1180px; margin-inline: auto; padding: 14px var(--gutter); display: flex; align-items: center; gap: 24px; }
.mark { font-family: var(--display); font-size: 22px; color: var(--text); text-decoration: none; white-space: nowrap; }
.mark span { color: #ffd1e8; text-shadow: 0 0 1px #fff, 0 0 6px var(--pink), 0 0 16px var(--pink); }
.bar nav { margin-left: auto; display: flex; gap: 22px; font-size: 15.5px; }
.bar nav a { color: var(--soft); text-decoration: none; }
.bar nav a:hover, .bar nav a[aria-current] { color: var(--text); }
@media (max-width: 560px) { .bar nav .wide { display: none; } }
@media (max-width: 420px) { .bar .in { gap: 14px; } .mark { font-size: 19px; } }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-family: var(--body); font-weight: 700; font-size: 16px; padding: 13px 22px; border-radius: 999px; border: 1.5px solid transparent; text-decoration: none; cursor: pointer; white-space: nowrap; transition: translate .15s ease, box-shadow .15s ease; }
.btn-sign { background: var(--sign); color: var(--sign-ink); box-shadow: 0 4px 0 var(--sign-deep), 0 0 26px rgba(243, 198, 63, .22); }
.btn-sign:hover { color: var(--sign-ink); translate: 0 -2px; box-shadow: 0 6px 0 var(--sign-deep), 0 0 34px rgba(243, 198, 63, .4); }
.bar .btn { padding: 8px 18px; font-size: 14.5px; }

/* ---------- neon sign covers (index cards and article headers) ---------- */
.cover { position: relative; overflow: hidden; border-radius: 16px; border: 1px solid var(--line); background: radial-gradient(120% 90% at 20% 0%, color-mix(in srgb, var(--c1) 26%, transparent), transparent 60%), radial-gradient(90% 80% at 100% 100%, color-mix(in srgb, var(--c2) 24%, transparent), transparent 60%), #120d18; display: flex; align-items: center; justify-content: center; gap: clamp(14px, 3vw, 28px); aspect-ratio: 16 / 7; --c1: var(--pink); --c2: var(--cyan); }
.cover .ns { --c: var(--c1); font-family: var(--display); line-height: 1; writing-mode: vertical-rl; letter-spacing: .12em; font-size: clamp(22px, 4.2vw, 40px); padding: .5em .32em; border: 2px solid var(--c); border-radius: 6px; color: color-mix(in srgb, var(--c) 45%, #fff); text-shadow: 0 0 4px var(--c), 0 0 14px var(--c); box-shadow: 0 0 10px var(--c), inset 0 0 10px color-mix(in srgb, var(--c) 70%, transparent); animation: glow 6s ease-in-out infinite; }
.cover .ns.h { writing-mode: horizontal-tb; padding: .3em .5em; letter-spacing: .06em; }
.cover .ns.b { --c: var(--c2); animation-duration: 8s; }
.cover .ns.far { filter: blur(1.5px); opacity: .55; font-size: clamp(16px, 2.6vw, 26px); }
@keyframes glow { 0%, 100% { opacity: 1; } 50% { opacity: .8; } }
@media (prefers-reduced-motion: reduce) { .cover .ns { animation: none; } }

/* ---------- blog index ---------- */
.index { max-width: 1180px; margin-inline: auto; padding: clamp(36px, 6vw, 72px) var(--gutter) 88px; }
.index h1 { font-family: var(--display); font-weight: 400; font-size: clamp(34px, 6vw, 56px); line-height: 1.1; margin: 0 0 clamp(28px, 4vw, 44px); }
.posts { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr)); gap: clamp(22px, 3vw, 36px); list-style: none; padding: 0; margin: 0; }
.posts a { display: grid; gap: 14px; text-decoration: none; color: var(--text); }
.posts h2 { font-size: 22px; line-height: 1.3; margin: 0; }
.posts p { margin: 0; color: var(--soft); font-size: 16.5px; line-height: 1.6; }
.posts a:hover h2 { color: #fff; text-decoration: underline; text-decoration-color: var(--pink); text-underline-offset: 5px; }
.posts a:hover .cover { border-color: var(--lav-dim); }
.posts .cover { aspect-ratio: 16 / 9; }
.posts .cover .ns { font-size: clamp(20px, 2.4vw, 28px); }
.posts .cover .ns.far { font-size: clamp(15px, 1.8vw, 20px); }

/* ---------- article ---------- */
.post { max-width: 760px; margin-inline: auto; padding: clamp(28px, 5vw, 56px) var(--gutter) 40px; }
.crumbs { font-size: 15px; margin: 0 0 18px; color: var(--mute); }
.crumbs a { color: var(--soft); }
.post h1 { font-family: var(--display); font-weight: 400; font-size: clamp(30px, 5.4vw, 48px); line-height: 1.15; margin: 0 0 14px; }
.meta { font-family: var(--mono); font-size: 13.5px; letter-spacing: .05em; text-transform: uppercase; color: var(--mute); margin: 0 0 26px; }
.post .cover { margin: 0 0 34px; }
.lead { font-size: 20px; line-height: 1.7; color: var(--soft); margin: 0 0 26px; }
.post h2 { font-size: clamp(23px, 3.4vw, 28px); line-height: 1.3; margin: 52px 0 14px; scroll-margin-top: 84px; }
.post h3 { font-size: 20px; line-height: 1.35; margin: 32px 0 8px; scroll-margin-top: 84px; }
.post p, .post ul, .post ol { margin: 0 0 18px; }
.post ul, .post ol { padding-left: 1.25em; }
.post li + li { margin-top: 8px; }
.post strong { color: #fff; }
.post [lang="ja"] { font-family: var(--body); }

.toc { background: var(--ink-2); border: 1px solid var(--line); border-radius: 12px; padding: 18px 22px; margin: 0 0 34px; font-size: 16.5px; }
.toc b { display: block; font-family: var(--mono); font-size: 13.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--lav); margin-bottom: 6px; }
.toc ol { margin: 0; padding-left: 1.2em; }
.toc li + li { margin-top: 4px; }

.note { background: var(--ink-2); border: 1px solid var(--line); border-left: 3px solid var(--sign); border-radius: 10px; padding: 16px 20px; margin: 0 0 22px; font-size: 17px; }
.note p:last-child, .note ul:last-child { margin-bottom: 0; }
.note.warn { border-left-color: var(--red); }

.table-wrap { overflow-x: auto; margin: 0 0 22px; border: 1px solid var(--line); border-radius: 12px; }
table { width: 100%; border-collapse: collapse; font-size: 16px; line-height: 1.55; min-width: 600px; }
th, td { text-align: left; vertical-align: top; padding: 12px 14px; border-bottom: 1px solid var(--line); }
tr:last-child td { border-bottom: 0; }
table.fit { min-width: 0; }  /* narrow tables wrap instead of scrolling on phones */
th { font-size: 14.5px; color: var(--lav); background: var(--ink-2); }
td:first-child { font-weight: 700; color: #fff; }

dl.phrases { display: grid; gap: 12px; margin: 0 0 22px; }
dl.phrases div { background: var(--ink-2); border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; }
dl.phrases dt { font-weight: 700; color: #fff; }
dl.phrases dd { margin: 0; color: var(--soft); font-size: 16.5px; }

/* the one call to action, at the end of each article */
.cta { margin: 56px 0 0; padding: clamp(22px, 4vw, 32px); border-radius: 16px; border: 1px solid var(--line); background: radial-gradient(100% 120% at 0% 0%, rgba(255, 79, 163, .16), transparent 60%), radial-gradient(100% 120% at 100% 100%, rgba(79, 227, 255, .12), transparent 60%), var(--ink-2); display: grid; gap: 14px; justify-items: start; }
.cta h2 { margin: 0; font-family: var(--display); font-weight: 400; font-size: clamp(24px, 4vw, 30px); line-height: 1.2; }
.cta p { margin: 0; color: var(--soft); }

.more { margin: 48px 0 0; }
.more h2 { font-size: 20px; margin: 0 0 12px; }
.more ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); background: var(--ink-2); margin-top: 48px; }
footer .in { max-width: 1180px; margin-inline: auto; padding: 26px var(--gutter) 40px; display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 12px 32px; color: var(--mute); font-size: 15px; }
footer .mark { font-size: 18px; }
footer .links { display: flex; flex-wrap: wrap; gap: 6px 18px; }
footer .links a { color: var(--soft); }