/* QPUBench landing page — hand-written, no build step, no external requests. */

:root {
  --bg:        #ffffff;
  --bg-alt:    #f6f8fb;
  --bg-sunken: #eef2f8;
  --fg:        #1c2333;
  --fg-muted:  #5a6478;
  --rule:      #dde3ed;
  --accent:    #2f6fd0;
  --accent-2:  #1a9a7a;
  --code-bg:   #10151f;
  --code-fg:   #d7dEEB;
  --yes:       #17795e;
  --no:        #a1443a;
  --radius:    12px;
  --wrap:      1120px;
  --sans: ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #0e131c;
    --bg-alt:    #141b27;
    --bg-sunken: #182131;
    --fg:        #e6ebf5;
    --fg-muted:  #98a3b8;
    --rule:      #263143;
    --accent:    #79aaf2;
    --accent-2:  #4fc7a4;
    --code-bg:   #0a0e16;
    --code-fg:   #d7deeb;
    --yes:       #4fc7a4;
    --no:        #e08a7f;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
}

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: 24px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--bg-sunken);
  border-radius: 5px;
  padding: 0.1em 0.36em;
}

h1, h2, h3 { line-height: 1.25; letter-spacing: -0.015em; margin: 0 0 0.5em; }
h2 { font-size: 1.55rem; }
h3 { font-size: 1.05rem; }

.skip {
  position: absolute; left: -9999px;
  background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; top: 0; z-index: 100; }

/* ---------- top bar ---------- */

.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; min-height: 58px; flex-wrap: wrap;
}
.brand {
  display: inline-flex; align-items: center; gap: 9px;
  font-weight: 700; font-size: 1.05rem; color: var(--fg);
}
.brand:hover { text-decoration: none; }
.topbar nav { display: flex; gap: 4px; flex-wrap: wrap; }
.topbar nav a {
  padding: 6px 11px; border-radius: 8px;
  color: var(--fg-muted); font-size: 0.92rem; font-weight: 500;
}
.topbar nav a:hover { background: var(--bg-sunken); color: var(--fg); text-decoration: none; }
.topbar nav a.ghost { border: 1px solid var(--rule); }

/* ---------- hero ---------- */

.hero {
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
  border-bottom: 1px solid var(--rule);
  padding: 56px 0 60px;
}
.hero-inner {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 48px; align-items: start;
}
.eyebrow {
  margin: 0 0 12px; font-size: 0.78rem; font-weight: 600;
  letter-spacing: 0.09em; text-transform: uppercase; color: var(--accent-2);
}
.hero h1 {
  font-size: clamp(1.8rem, 3.2vw, 2.45rem);
  margin-bottom: 18px; text-wrap: balance;
}
.lede { font-size: 1.05rem; color: var(--fg-muted); margin: 0 0 24px; max-width: 60ch; }
.lede strong { color: var(--fg); }

.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin: 0 0 24px; }
.btn {
  display: inline-block; padding: 9px 18px; border-radius: 9px;
  border: 1px solid var(--rule); font-weight: 600; font-size: 0.94rem;
  color: var(--fg); background: var(--bg);
}
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
@media (prefers-color-scheme: dark) { .btn.primary { color: #0e131c; } }

.badges { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; }
.badges li {
  font-size: 0.78rem; color: var(--fg-muted);
  border: 1px solid var(--rule); border-radius: 999px; padding: 3px 11px;
}
.badges code { background: none; padding: 0; font-size: 0.95em; }

/* ---------- code ---------- */

.hero-code { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--rule); }
.code-head {
  display: flex; align-items: center; gap: 7px;
  background: var(--bg-sunken); padding: 9px 14px; border-bottom: 1px solid var(--rule);
}
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot.r { background: #e0705f; } .dot.y { background: #dfb04b; } .dot.g { background: #56ac72; }
.code-title { margin-left: 6px; font-family: var(--mono); font-size: 0.78rem; color: var(--fg-muted); }

pre {
  margin: 0; background: var(--code-bg); color: var(--code-fg);
  padding: 18px 20px; overflow-x: auto;
  font-family: var(--mono); font-size: 0.83rem; line-height: 1.7;
}
pre code { background: none; padding: 0; font-size: inherit; color: inherit; }
pre .k { color: #c98bdc; }   /* keyword */
pre .t { color: #6cc4f5; }   /* type / class */
pre .s { color: #97d68a; }   /* string */
pre .n { color: #e8b473; }   /* number */
pre .c { color: #7b8699; font-style: italic; }
pre .d { color: #e0c25c; }   /* decorator */

.code-foot {
  margin: 0; padding: 12px 16px; font-size: 0.84rem; color: var(--fg-muted);
  background: var(--bg-sunken); border-top: 1px solid var(--rule);
}
.wide-code { border-radius: var(--radius); border: 1px solid var(--rule); }

/* ---------- generic sections ---------- */

section.wrap { padding: 56px 24px; }
.section-lede { color: var(--fg-muted); max-width: 78ch; margin: 0 0 28px; }

/* ---------- three ideas ---------- */

.card-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.card {
  position: relative; padding: 22px 22px 20px;
  border: 1px solid var(--rule); border-radius: var(--radius); background: var(--bg-alt);
}
.card-num {
  display: inline-grid; place-items: center; width: 26px; height: 26px;
  border-radius: 8px; background: var(--accent); color: #fff;
  font-size: 0.8rem; font-weight: 700; margin-bottom: 10px;
}
@media (prefers-color-scheme: dark) { .card-num { color: #0e131c; } }
.card p { color: var(--fg-muted); font-size: 0.93rem; margin: 0 0 14px; }
.card h3 em { font-style: italic; color: var(--accent-2); }
.card > a { font-size: 0.9rem; font-weight: 600; }

/* ---------- logo grid ---------- */

.packages { background: var(--bg-alt); max-width: none; }
.packages > * { max-width: var(--wrap); margin-inline: auto; }
.logo-band { margin: 0 0 40px; max-width: var(--wrap); }
.logo-band h3 {
  font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.09em;
  color: var(--accent-2); margin-bottom: 6px;
}
.band-blurb { color: var(--fg-muted); font-size: 0.9rem; margin: 0 0 18px; max-width: 82ch; }

.logo-grid {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 12px;
  grid-template-columns: repeat(auto-fill, minmax(248px, 1fr));
}
.logo-cell {
  position: relative;
  border: 1px solid var(--rule); border-radius: var(--radius);
  background: var(--bg); overflow: hidden;
  transition: border-color .14s ease, transform .14s ease;
}
.logo-cell:hover { border-color: var(--accent); transform: translateY(-2px); }
.logo-link { display: block; padding: 10px 12px 12px; color: inherit; }
.logo-link:hover { text-decoration: none; }
.logo-link img { display: block; width: 100%; height: auto; max-width: 232px; }
.logo-note {
  display: block; margin-top: 2px; padding-left: 4px;
  font-size: 0.775rem; color: var(--fg-muted); line-height: 1.45;
}
.logo-up {
  display: block; padding: 6px 16px; font-size: 0.72rem;
  color: var(--fg-muted); border-top: 1px solid var(--rule); background: var(--bg-sunken);
}
.logo-up:hover { color: var(--accent); text-decoration: none; }
.grid-note { font-size: 0.82rem; color: var(--fg-muted); margin: 0; }

/* ---------- scope ---------- */

.scope-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
.scope-grid h3 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.09em; }
.scope-grid h3.yes { color: var(--yes); }
.scope-grid h3.no { color: var(--no); }
.scope-grid ul { margin: 0; padding-left: 1.1em; }
.scope-grid li { margin-bottom: 10px; color: var(--fg-muted); font-size: 0.93rem; }
.scope-grid li strong { color: var(--fg); }
.caveat {
  margin: 28px 0 0; padding: 16px 20px;
  border-left: 3px solid var(--accent-2); background: var(--bg-alt);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.9rem; color: var(--fg-muted);
}
.caveat strong { color: var(--fg); }

/* ---------- contents ---------- */

.contents { background: var(--bg-alt); max-width: none; }
.contents > * { max-width: var(--wrap); margin-inline: auto; }
.toc-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 26px; }
.toc-col h3 {
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.09em;
  color: var(--accent-2); margin-bottom: 10px;
}
.toc-col ul { list-style: none; margin: 0; padding: 0; }
.toc-col li { margin-bottom: 9px; font-size: 0.9rem; color: var(--fg-muted); line-height: 1.5; }

/* ---------- footer ---------- */

.footer { border-top: 1px solid var(--rule); padding: 34px 0; background: var(--bg); }
.footer-inner {
  display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap;
  align-items: flex-start;
}
.footer p { margin: 0 0 8px; font-size: 0.85rem; color: var(--fg-muted); max-width: 62ch; }
.footer-brand {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; color: var(--fg) !important; font-size: 0.95rem !important;
}
.footer nav { display: flex; flex-direction: column; gap: 7px; font-size: 0.87rem; }

/* ---------- responsive ---------- */

@media (max-width: 940px) {
  .hero-inner { grid-template-columns: 1fr; gap: 34px; }
  .card-row { grid-template-columns: 1fr; }
  .toc-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .scope-grid { grid-template-columns: 1fr; gap: 24px; }
}
@media (max-width: 560px) {
  .toc-grid { grid-template-columns: 1fr; }
  .logo-grid { grid-template-columns: 1fr; }
  section.wrap { padding: 40px 20px; }
  .hero { padding: 38px 0 42px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .logo-cell { transition: none; }
  .logo-cell:hover { transform: none; }
}