/* ─────────────────────────────────────────────────────────────
   Quanturama blog — brand design system
   Fonts: DM Serif Display (headings) · Manrope (body) · DM Mono (labels)
   Accent: atoll cyan. Self-hosted woff2, theme-aware.
   ───────────────────────────────────────────────────────────── */

@font-face {
  font-family: "DM Serif Display";
  src: url("/static/fonts/dm-serif-display-400.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Manrope";
  src: url("/static/fonts/manrope-variable.woff2") format("woff2");
  font-weight: 300 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "DM Mono";
  src: url("/static/fonts/dm-mono-400.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "DM Mono";
  src: url("/static/fonts/dm-mono-500.woff2") format("woff2");
  font-weight: 500; font-style: normal; font-display: swap;
}

:root {
  --bg:#fbfaf8; --fg:#16181d; --muted:#5f6672; --accent:#0090ab; --accent-bright:#00B1D2;
  --card:#ffffff; --line:#e8e5df; --line-soft:#f0ede7;
  --serif:"DM Serif Display", Georgia, "Times New Roman", serif;
  --sans:"Manrope", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono:"DM Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root { --bg:#0d0f12; --fg:#e7e9ee; --muted:#9aa1ad; --accent:#3ec8e6; --accent-bright:#00B1D2;
    --card:#15181d; --line:#242a31; --line-soft:#1b1f25; }
}
:root[data-theme="light"] { --bg:#fbfaf8; --fg:#16181d; --muted:#5f6672; --accent:#0090ab;
  --card:#ffffff; --line:#e8e5df; --line-soft:#f0ede7; }
:root[data-theme="dark"] { --bg:#0d0f12; --fg:#e7e9ee; --muted:#9aa1ad; --accent:#3ec8e6;
  --card:#15181d; --line:#242a31; --line-soft:#1b1f25; }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin:0; background:var(--bg); color:var(--fg);
  font-family:var(--sans); font-size:17px; line-height:1.68; font-weight:400;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }
img { max-width: 100%; }

/* ── Masthead ── */
/* Branded dark strip — always jet, both themes. White logo, light text, cyan hover. */
.masthead { display:flex; justify-content:space-between; align-items:center;
  padding:1.15rem 2rem; border-bottom:1px solid #2a2a2d;
  position:sticky; top:0; z-index:20;
  background:color-mix(in srgb, #1A1A1C 92%, transparent); backdrop-filter:saturate(1.4) blur(10px); }
.brand { display:flex; align-items:center; gap:.6rem; color:#f4f3f1; }
.brand:hover { text-decoration:none; }
.brand-wordmark { font-family:var(--mono); font-weight:500; font-size:.82rem;
  letter-spacing:.22em; color:#f4f3f1; }
/* The bar is always dark → always show the white (light) logo variant. */
.masthead .brand-logo--dark { display:none !important; }
.masthead .brand-logo--light { display:block !important; }
.masthead nav { display:flex; gap:1.5rem; }
.masthead nav a { font-family:var(--mono); font-size:.8rem; letter-spacing:.04em;
  color:#a7adb5; text-transform:uppercase; }
.masthead nav a:hover { color:var(--accent-bright); text-decoration:none; }

main { max-width: 720px; margin: 0 auto; padding: 2.5rem 1.3rem 4rem; }

/* ── Type ── */
h1, h2, h3 { font-family:var(--serif); font-weight:400; letter-spacing:-.01em; }
.tag { font-family:var(--mono); font-size:.68rem; text-transform:uppercase;
  letter-spacing:.14em; color:var(--accent); font-weight:500; }
time { font-family:var(--mono); color:var(--muted); font-size:.78rem; letter-spacing:.02em; }
.lede { font-size:1.28rem; line-height:1.5; color:var(--fg); font-weight:400; }

/* ── Hero ── */
.hero { padding: 2rem 0 2.6rem; border-bottom: 1px solid var(--line); margin-bottom: 2.4rem; }
.hero h1 { font-size: clamp(2.3rem, 5.5vw, 3.1rem); line-height:1.08; margin:0 0 .8rem; }
.hero p, .hero .lede { color:var(--muted); margin:0; max-width: 34em; }

/* ── Section labels ── */
.section-head { font-family:var(--mono); font-size:.72rem; text-transform:uppercase;
  letter-spacing:.16em; color:var(--muted); font-weight:500; margin:2.8rem 0 .5rem;
  display:flex; align-items:center; gap:.6rem; }
.section-head::after { content:""; flex:1; height:1px; background:var(--line); }
.section-note { color:var(--muted); font-size:.95rem; margin:0 0 1.3rem; }

/* ── Cards ── */
.card { background:var(--card); border:1px solid var(--line); border-radius:12px;
  padding:1.3rem 1.5rem; margin:1rem 0; display:block; transition:border-color .16s, transform .16s; }
.card:hover { border-color:color-mix(in srgb, var(--accent) 45%, var(--line)); }
a.card:hover { text-decoration:none; }
.card h2 { margin:.35rem 0 .2rem; font-size:1.35rem; line-height:1.22; }
.card h2 a { color:var(--fg); }
.card h2 a:hover { color:var(--accent); text-decoration:none; }
.card h3 { margin:0 0 .3rem; font-size:1.2rem; }
.products-strip .card h3 { color:var(--accent); display:flex; align-items:baseline; gap:.35rem; }
.products-strip .card h3 .ext { font-family:var(--mono); color:var(--muted); font-size:.7em; font-weight:400; }
.products-strip .card p { color:var(--muted); margin:.25rem 0 0; }

/* thumbnail cards */
.card--thumb { display:flex; gap:1.1rem; align-items:stretch; }
.card--thumb .thumb { flex:0 0 116px; }
.card--thumb .thumb img { width:116px; height:88px; object-fit:cover; border-radius:8px; display:block; }
.card--thumb .thumb img.is-logo { object-fit:contain; padding:8px; background:var(--bg); }
.card--thumb .card-text { flex:1; min-width:0; }
@media (max-width:560px){ .card--thumb{ flex-direction:column; }
  .card--thumb .thumb, .card--thumb .thumb img{ width:100%; height:auto; } }

/* ── Post / article ── */
.post h1 { font-size:clamp(2rem, 5vw, 2.7rem); line-height:1.12; margin:.2rem 0 .6rem; }
.post > time, .post > .tag { display:inline-block; }
.post .body { margin-top:1.8rem; font-size:1.06rem; line-height:1.75; }
.post .body h2 { font-size:1.6rem; line-height:1.25; margin:2.4rem 0 .7rem; }
.post .body h3 { font-size:1.28rem; margin:1.9rem 0 .5rem; }
.post .body p { margin:0 0 1.15rem; }
.post .body ul, .post .body ol { margin:0 0 1.3rem; padding-left:1.3rem; }
.post .body li { margin-bottom:.5rem; }
.post .body li::marker { color:var(--accent); }
.post .body a { color:var(--accent); text-decoration:underline; text-underline-offset:2px; }
.post .body code { font-family:var(--mono); background:var(--line-soft); border:1px solid var(--line);
  border-radius:5px; padding:.08rem .38rem; font-size:.88em; }
.post .body blockquote { margin:1.6rem 0; padding:.3rem 0 .3rem 1.2rem;
  border-left:3px solid var(--accent); color:var(--muted); font-style:italic; }
.about-close { border-top:1px solid var(--line); padding-top:1.3rem; color:var(--muted); }

/* hero image on posts */
.hero-img { width:100%; max-height:440px; object-fit:cover; border-radius:12px;
  margin:1.6rem 0; border:1px solid var(--line); }
.hero-img.is-logo { object-fit:contain; max-height:280px; padding:2.4rem; background:var(--card); }

/* ── Product pillar ── */
.product .lede { margin-bottom:1.4rem; }
table.surfaces { width:100%; border-collapse:collapse; margin:.6rem 0 1rem; }
table.surfaces td { padding:.65rem .5rem; border-bottom:1px solid var(--line); font-size:.96rem; }
table.surfaces td:first-child { font-weight:600; }
.product details.faq, details.faq { border-bottom:1px solid var(--line); padding:.2rem 0; }
details.faq summary { cursor:pointer; padding:.85rem 0; font-weight:600; list-style:none;
  display:flex; justify-content:space-between; align-items:center; }
details.faq summary::-webkit-details-marker { display:none; }
details.faq summary::after { content:"+"; font-family:var(--mono); color:var(--accent); font-size:1.2rem; }
details.faq[open] summary::after { content:"–"; }
details.faq p { margin:0 0 1rem; color:var(--muted); }

/* ── CTA band ── */
.cta-band { margin:3.2rem 0; padding:2rem 1.8rem; border:1px solid var(--line); border-radius:14px;
  background:linear-gradient(135deg, color-mix(in srgb, var(--accent) 6%, var(--card)), var(--card));
  display:flex; align-items:center; justify-content:space-between; gap:1.3rem; flex-wrap:wrap; }
.cta-band p { margin:0; font-family:var(--serif); font-size:1.32rem; color:var(--fg); }
.cta-btn { font-family:var(--mono); font-size:.82rem; letter-spacing:.03em; text-transform:uppercase;
  padding:.72rem 1.4rem; border-radius:9px; background:var(--accent); color:#00252b; font-weight:500;
  white-space:nowrap; }
:root[data-theme="dark"] .cta-btn, :root:not([data-theme]) .cta-btn { color:#00252b; }
.cta-btn:hover { background:var(--accent-bright); text-decoration:none; }
@media (max-width:600px){ .cta-band{ flex-direction:column; align-items:flex-start; }
  .cta-band p{ font-size:1.15rem; } }

/* ── Footer ── */
.site-footer { border-top:1px solid var(--line); margin-top:4rem; padding:2.8rem 2rem 2.2rem;
  color:var(--muted); font-size:.9rem; background:var(--line-soft); }
.footer-grid { max-width:900px; margin:0 auto; display:grid;
  grid-template-columns:1.7fr 1fr 1fr 1.1fr 1fr; gap:1.8rem; }
.footer-col h4, .footer-sub h4 { font-family:var(--mono); font-size:.7rem; text-transform:uppercase;
  letter-spacing:.14em; color:var(--fg); margin:0 0 .8rem; font-weight:500; }
.footer-col a { display:block; color:var(--muted); margin-bottom:.45rem; }
.footer-col a:hover { color:var(--accent); text-decoration:none; }
.footer-sub p { margin:0 0 .9rem; }
.sub-form { display:flex; gap:.5rem; }
.sub-form input[type=email] { flex:1; min-width:0; padding:.6rem .75rem; border:1px solid var(--line);
  border-radius:9px; background:var(--card); color:var(--fg); font-family:var(--sans); font-size:.9rem; }
.sub-form input[type=email]:focus { outline:none; border-color:var(--accent); }
.sub-form button { font-family:var(--mono); font-size:.78rem; text-transform:uppercase; letter-spacing:.04em;
  padding:.6rem 1rem; border:0; border-radius:9px; cursor:pointer; background:var(--accent); color:#00252b; font-weight:500; }
.sub-form button:hover { background:var(--accent-bright); }
.sub-form .hp { position:absolute; left:-9999px; width:1px; height:1px; }
.footer-legal { max-width:900px; margin:2.2rem auto 0; padding-top:1.3rem; border-top:1px solid var(--line);
  font-family:var(--mono); font-size:.74rem; letter-spacing:.02em; }
@media (max-width:680px){ .footer-grid{ grid-template-columns:1fr 1fr; } .footer-sub{ grid-column:1/-1; } }

/* ── Brand logo — theme-aware ── */
.brand-logo { height:40px; width:auto; display:block; }
.brand-logo--light { display:none; }
@media (prefers-color-scheme: dark) { .brand-logo--dark{ display:none; } .brand-logo--light{ display:block; } }
:root[data-theme="dark"] .brand-logo--dark { display:none; }
:root[data-theme="dark"] .brand-logo--light { display:block; }
:root[data-theme="light"] .brand-logo--dark { display:block; }
:root[data-theme="light"] .brand-logo--light { display:none; }

@media (max-width:560px){
  .masthead { padding:.9rem 1.1rem; }
  .masthead nav { gap:1rem; }
  .brand-wordmark { display:none; }
  main { padding:2rem 1.1rem 3rem; }
}