/*
  Styles for wisdomugonwokoma.com.
  Plain CSS with custom properties, no build step, no dependencies.
  Organised as: tokens, base, layout, components, pages, responsive.
*/

/* Tokens */
:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --ink: #0f172a;
  --ink-strong: #0b1120;
  --muted: #475569;
  --muted-soft: #64748b;
  --line: #e5e7eb;
  --line-soft: #eef2f7;
  --accent: #0f172a;
  --accent-ink: #ffffff;
  --focus: #2563eb;
  --radius-sm: 10px;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-lift: 0 10px 30px rgba(15, 23, 42, 0.08);
  --maxw: 1120px;
  --font: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --surface: #0f172a;
    --surface-soft: #111a2e;
    --ink: #f1f5f9;
    --ink-strong: #f8fafc;
    --muted: #cbd5e1;
    --muted-soft: #94a3b8;
    --line: #1e293b;
    --line-soft: #172033;
    --accent: #f1f5f9;
    --accent-ink: #0b1120;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-lift: 0 10px 30px rgba(0, 0, 0, 0.4);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--muted);
  font-family: var(--font);
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  color: var(--ink);
  line-height: 1.15;
  margin: 0 0 0.5em;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

h3 {
  font-size: 1.2rem;
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--ink);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 4px;
}

img {
  max-width: 100%;
  display: block;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 100;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* Layout */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(150%) blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  color: var(--ink);
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav a {
  color: var(--muted-soft);
  font-size: 1rem;
  font-weight: 500;
}

.nav a:hover {
  color: var(--ink);
  text-decoration: none;
}

.nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.7rem;
  color: var(--ink);
  cursor: pointer;
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 5rem;
  padding: 2.5rem 0;
  color: var(--muted-soft);
  font-size: 0.95rem;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
}

.section {
  padding: 4rem 0;
}

.section-lead {
  max-width: 42rem;
  margin-bottom: 2.5rem;
}