:root {
  --bg: #f9fafb;           /* light background */
  --fg: #1a1a1a;           /* dark text */
  --muted: #555;           /* muted text */
  --accent: #00796b;       /* teal accent */
  --accent-2: #1565c0;     /* blue accent */
  --line: #ddd;            /* light border */
  --card: #ffffff;         /* card background */
  --code: #f4f4f4;         /* code background */
  --shadow: rgba(0, 0, 0, 0.08);
  --maxw: 1080px;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial, sans-serif;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

header, main, footer { width: 100%; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 24px; }

.hero { padding: 56px 0 24px; display: grid; gap: 24px; align-items: center; }
.hero h1 { font-size: clamp(28px, 4vw, 44px); margin: 0; line-height: 1.15; letter-spacing: 0.2px; }
.hero p.subhead { margin: 0; color: var(--muted); font-size: clamp(16px, 2.2vw, 20px); }
.hero .media {
  margin-top: 12px;
  border: 1px solid var(--line);
  background: #fff; /* light background for media container */
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px var(--shadow);
}
.hero .media img { width: 100%; height: auto; display: block; }

.pull {
  padding: 14px 16px;
  border-left: 3px solid var(--accent);
  background: #eef7f6; /* light variant */
  color: var(--fg);
  border-radius: 6px;
  margin: 8px 0 0;
  font-style: italic;
}

nav.breadcrumbs { margin-top: 12px; color: var(--muted); font-size: 14px; }
nav.breadcrumbs a { color: var(--muted); }

section { padding: 28px 0; border-top: 1px solid var(--line); }
section:first-of-type { border-top: none; }

h2 { font-size: clamp(22px, 3vw, 32px); margin: 0 0 6px; }
h3 { font-size: clamp(18px, 2.2vw, 22px); margin: 14px 0 6px; }
p { line-height: 1.6; margin: 10px 0 0; color: var(--fg); }

.grid { display: grid; gap: 18px; }
@media (min-width: 900px) {
  .grid.two { grid-template-columns: 1fr 1fr; align-items: start; }
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
  box-shadow: 0 10px 20px var(--shadow);
}

ul, ol { margin: 10px 0 0 18px; }
li { margin: 8px 0; }

.fact {
  background: #f5f9ff; /* light variant */
  border: 1px solid #dce6f5;
  border-radius: 10px;
  padding: 14px 16px;
}

.kbd {
  background: var(--code);
  padding: 2px 6px;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95em;
}

.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }

.btn {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #f0f0f0; /* light button background */
  color: var(--fg);
  text-decoration: none;
}

.btn.primary {
  background: linear-gradient(180deg, #1d7cff, #1060dc);
  border-color: #0f58ca;
  color: #fff;
}

.small { font-size: 14px; color: var(--muted); }

footer .links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 6px; }