/* HB SevenB site. No web fonts and no third-party files: the CSP in _headers allows only this origin. */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #0b1220;
  --muted: #4b5563;
  --line: #e2e6ec;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --accent-soft: #e3f3f0;
  --grid: rgba(11, 18, 32, 0.045);
  --logo-bg: #0b1220;
  --logo-line: #2dd4bf;
  --live: #15803d;
  --live-soft: #e7f6ec;
  --build: #a16207;
  --build-soft: #fbf3e0;
  --radius: 14px;
  --sans: "Inter", "Segoe UI", ui-sans-serif, system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, "SFMono-Regular", Menlo, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1220;
    --surface: #111a2d;
    --ink: #e8edf4;
    --muted: #a4aec0;
    --line: #1f2b42;
    --accent: #2dd4bf;
    --accent-ink: #04201d;
    --accent-soft: #0e2a2d;
    --grid: rgba(232, 237, 244, 0.04);
    --logo-bg: #16223a;
    --live: #4ade80;
    --live-soft: #10291b;
    --build: #fbbf24;
    --build-soft: #2b2310;
  }
}

:root[data-theme="dark"] {
  --bg: #0b1220;
  --surface: #111a2d;
  --ink: #e8edf4;
  --muted: #a4aec0;
  --line: #1f2b42;
  --accent: #2dd4bf;
  --accent-ink: #04201d;
  --accent-soft: #0e2a2d;
  --grid: rgba(232, 237, 244, 0.04);
  --logo-bg: #16223a;
  --live: #4ade80;
  --live-soft: #10291b;
  --build: #fbbf24;
  --build-soft: #2b2310;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--sans);
  overflow-wrap: anywhere;
}

img, svg { max-width: 100%; }

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 0.6em; }
h1 { font-size: clamp(2.1rem, 5.2vw, 3.5rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 700; }
h3 { font-size: 1.2rem; font-weight: 650; }
p { margin: 0 0 1em; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 28px; } }

.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }

/* Header */
.top { border-bottom: 1px solid var(--line); background: var(--bg); position: sticky; top: 0; z-index: 5; }
.top-row { display: flex; align-items: center; justify-content: space-between; gap: 12px 24px; flex-wrap: wrap; padding-top: 12px; padding-bottom: 12px; }
.logo { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.logo-bg { fill: var(--logo-bg); }
.logo-line { fill: none; stroke: var(--logo-line); stroke-width: 6; stroke-linecap: round; stroke-linejoin: round; }
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-text strong { font-size: 1.05rem; letter-spacing: -0.01em; }
.logo-text span { font: 500 0.72rem/1.2 var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }
.nav { display: flex; flex-wrap: wrap; gap: 4px; }
.nav a { color: var(--muted); text-decoration: none; padding: 6px 10px; border-radius: 8px; font-size: 0.95rem; }
.nav a:hover { color: var(--ink); background: var(--accent-soft); }
.nav a[aria-current="page"] { color: var(--ink); background: var(--accent-soft); font-weight: 600; }

/* Sections */
.section { padding: 56px 0; }
.section + .section { border-top: 1px solid var(--line); }
.eyebrow { font: 600 0.78rem/1.2 var(--mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--accent); margin: 0 0 14px; }
.lead { font-size: 1.2rem; color: var(--muted); max-width: 62ch; }
.muted { color: var(--muted); }

.hero {
  padding: 72px 0 64px;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
  border-bottom: 1px solid var(--line);
}
.hero h1 { max-width: 18ch; }
.page-head { padding: 56px 0 40px; border-bottom: 1px solid var(--line); }
.page-head h1 { font-size: clamp(1.9rem, 4.4vw, 2.9rem); max-width: 22ch; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn { display: inline-block; padding: 12px 18px; border-radius: 10px; font-weight: 600; text-decoration: none; border: 1px solid var(--accent); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { color: var(--ink); border-color: var(--line); background: var(--surface); }
.btn-ghost:hover { border-color: var(--accent); }

/* Cards */
.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); }
.card h3 { margin-bottom: 0.4em; }
.card ul { margin: 0.6em 0 0; padding-left: 1.1em; color: var(--muted); }
.card li { margin: 0.25em 0; }
.card .icon { width: 40px; height: 40px; border-radius: 10px; background: var(--accent-soft); display: grid; place-items: center; margin-bottom: 14px; }
.card .icon svg { width: 22px; height: 22px; fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* Figures */
.stats { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); margin-top: 24px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.stat b { display: block; font-size: 2.2rem; line-height: 1.1; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.stat span { color: var(--muted); font-size: 0.95rem; }
.note { font-size: 0.9rem; color: var(--muted); margin-top: 14px; }

/* Principles list */
.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); counter-reset: step; }
.steps li { counter-increment: step; border-left: 3px solid var(--accent); padding: 4px 0 4px 16px; }
.steps li::before { content: counter(step, decimal-leading-zero); display: block; font: 600 0.8rem/1 var(--mono); color: var(--accent); margin-bottom: 6px; }
.steps strong { display: block; }
.steps span { color: var(--muted); }

/* Case studies */
.cases { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 460px), 1fr)); align-items: start; }
.case { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.case header { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 10px; }
.case h3 { margin: 0 0 0.4em; }
.case ul { margin: 0.6em 0 0; padding-left: 1.1em; }
.case li { margin: 0.25em 0; }
.chip { font: 600 0.72rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; padding: 5px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }
.chip-live { background: var(--live-soft); color: var(--live); }
.chip-build { background: var(--build-soft); color: var(--build); }
.stack { font: 500 0.85rem/1.5 var(--mono); color: var(--muted); margin: 0.2em 0 0.8em; }

/* Tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 0.97rem; }
th, td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font: 600 0.78rem/1.3 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
tr:last-child td { border-bottom: 0; }

/* Text pages */
.prose { max-width: 70ch; }
.prose h2 { font-size: 1.35rem; margin-top: 1.6em; }
.prose ul { padding-left: 1.2em; }
.prose li { margin: 0.3em 0; }

.band { background: var(--accent-soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; display: flex; flex-wrap: wrap; gap: 16px 28px; align-items: center; justify-content: space-between; }
.band h2 { margin: 0 0 0.2em; font-size: 1.5rem; }
.band p { margin: 0; color: var(--muted); }

.split { display: grid; gap: 28px; grid-template-columns: 1fr; }
@media (min-width: 860px) { .split { grid-template-columns: 1.2fr 1fr; align-items: start; } }

/* Footer */
.foot { border-top: 1px solid var(--line); padding: 36px 0 28px; margin-top: 24px; color: var(--muted); font-size: 0.95rem; }
.foot-grid { display: grid; gap: 12px 28px; grid-template-columns: 1fr; }
@media (min-width: 720px) { .foot-grid { grid-template-columns: 1.4fr 1fr; } }
.foot p { margin: 0 0 0.5em; }
.foot-brand { color: var(--ink); }
.foot-small { font-size: 0.85rem; margin-top: 18px; }