/* ==========================================================
   Kenya Tech & Student Hub — Global Stylesheet
   ========================================================== */
:root {
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --sky-500: #0ea5e9;
  --ink-900: #0f172a;
  --ink-700: #334155;
  --ink-500: #64748b;
  --ink-300: #cbd5e1;
  --ink-100: #f1f5f9;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --border: #e2e8f0;
  --success: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 45px rgba(15, 23, 42, 0.12);
  --font-body: 'Plus Jakarta Sans', system-ui, -apple-system, Segoe UI, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --container: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink-900);
  background: var(--surface-alt);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--blue-600); text-decoration: none; }
a:hover { color: var(--blue-700); }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; font-weight: 800; letter-spacing: -0.02em; }
p { margin: 0 0 1em; }
.muted { color: var(--ink-500); }
.small { font-size: 0.875rem; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }

.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--blue-600); color: #fff;
  padding: 10px 16px; border-radius: 0 0 8px 0; z-index: 1000;
}
.skip-link:focus { left: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ink-900); font-size: 1.05rem; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 10px; color: #fff; font-size: 0.85rem;
  background: linear-gradient(135deg, var(--blue-600), var(--sky-500));
  box-shadow: var(--shadow-sm);
}
.brand-text em { font-style: normal; color: var(--ink-500); font-weight: 600; }
.main-nav { display: flex; gap: 6px; }
.main-nav a {
  color: var(--ink-700); font-weight: 600; font-size: 0.95rem;
  padding: 10px 14px; border-radius: 999px; transition: background .15s, color .15s;
}
.main-nav a:hover, .main-nav a.active { background: var(--ink-100); color: var(--blue-700); }
.nav-toggle { display: none; flex-direction: column; gap: 4px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink-900); border-radius: 2px; }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(1200px 400px at 10% -10%, rgba(37,99,235,0.12), transparent),
    radial-gradient(900px 400px at 90% -20%, rgba(14,165,233,0.14), transparent),
    var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 72px 0 56px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--ink-100); color: var(--blue-700); font-weight: 700; font-size: 0.8rem;
  padding: 6px 14px; border-radius: 999px; margin-bottom: 18px;
}
.hero h1 { font-size: clamp(2rem, 4vw, 3.1rem); max-width: 18ch; }
.hero p.lead { font-size: 1.15rem; color: var(--ink-700); max-width: 60ch; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 22px; border-radius: 999px; font-weight: 700; font-size: 0.95rem;
  border: 1px solid transparent; cursor: pointer; transition: transform .15s, box-shadow .15s, background .15s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, var(--blue-600), var(--sky-500)); color: #fff; box-shadow: var(--shadow-md); }
.btn-primary:hover { color: #fff; }
.btn-outline { background: #fff; color: var(--ink-900); border-color: var(--border); }
.btn-block { width: 100%; }
.btn-sm { padding: 8px 14px; font-size: 0.85rem; }
.btn-danger { background: var(--danger); color: #fff; }

/* ---------- Sections ---------- */
.section { padding: 56px 0; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 28px; flex-wrap: wrap; }
.section-head h2 { font-size: 1.75rem; margin-bottom: 4px; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; font-weight: 800; color: var(--blue-600); }

.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

/* ---------- Cards ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 22px; box-shadow: var(--shadow-sm); transition: box-shadow .15s, transform .15s;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card .tag {
  display: inline-block; font-size: 0.72rem; font-weight: 800; text-transform: uppercase;
  letter-spacing: .04em; color: var(--blue-700); background: #eff6ff; padding: 4px 10px; border-radius: 999px; margin-bottom: 10px;
}
.card h3 { font-size: 1.1rem; margin-bottom: 6px; }
.card .meta { color: var(--ink-500); font-size: 0.82rem; margin-top: 12px; display: flex; gap: 14px; }

.feature-card { text-align: center; padding: 28px 22px; }
.feature-icon {
  width: 54px; height: 54px; margin: 0 auto 14px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center; font-size: 1.4rem;
  background: linear-gradient(135deg, #eff6ff, #e0f2fe); color: var(--blue-700);
}

/* ---------- Forms ---------- */
label { display: block; font-weight: 700; font-size: 0.88rem; margin-bottom: 6px; }
input, select, textarea {
  width: 100%; padding: 12px 14px; border-radius: var(--radius-sm); border: 1px solid var(--border);
  font-family: inherit; font-size: 0.95rem; background: #fff; color: var(--ink-900);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--blue-600); outline-offset: 1px; }
.field { margin-bottom: 16px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 640px) { .field-row { grid-template-columns: 1fr; } }

/* ---------- Calculator ---------- */
.calc-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
@media (max-width: 900px) { .calc-wrap { grid-template-columns: 1fr; } }
.calc-panel { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; box-shadow: var(--shadow-sm); }
.result-row { display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px dashed var(--border); font-size: 0.95rem; }
.result-row:last-child { border-bottom: none; }
.result-row.total { font-weight: 800; font-size: 1.15rem; color: var(--blue-700); border-top: 2px solid var(--ink-100); margin-top: 6px; padding-top: 16px; }
.result-panel { background: linear-gradient(160deg, #0f172a, #1e3a8a); color: #fff; border-radius: var(--radius-lg); padding: 28px; }
.result-panel .result-row { border-bottom-color: rgba(255,255,255,0.15); }
.result-panel .result-row.total { color: #93c5fd; border-top-color: rgba(255,255,255,0.2); }
.net-figure { font-size: 2.4rem; font-weight: 800; font-family: var(--font-mono); }

/* ---------- Table ---------- */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
th { background: var(--ink-100); font-weight: 800; }

/* ---------- Alerts / badges ---------- */
.alert { padding: 14px 18px; border-radius: var(--radius-sm); margin-bottom: 18px; font-size: 0.9rem; }
.alert-success { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 0.72rem; font-weight: 700; }
.badge-published { background: #f0fdf4; color: #166534; }
.badge-draft { background: #fff7ed; color: #9a3412; }

/* ---------- Ad slot placeholders (AdSense-friendly, non-intrusive) ---------- */
.ad-slot {
  background: var(--surface); border: 1px dashed var(--ink-300); border-radius: var(--radius-md);
  padding: 18px; text-align: center; color: var(--ink-500); font-size: 0.8rem; margin: 32px 0;
}

/* ---------- Footer ---------- */
.site-footer { background: var(--ink-900); color: #cbd5e1; padding: 56px 0 24px; margin-top: 60px; }
.site-footer .brand { color: #fff; }
.site-footer h4 { color: #fff; font-size: 0.9rem; text-transform: uppercase; letter-spacing: .05em; margin-bottom: 14px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.4fr; gap: 32px; }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-links { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.footer-links a { color: #cbd5e1; }
.footer-links a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); margin-top: 40px; padding-top: 20px; font-size: 0.82rem; color: #94a3b8; }

/* ---------- Prose (note body) ---------- */
.prose { font-size: 1.02rem; }
.prose h2, .prose h3 { margin-top: 1.6em; }
.prose pre { background: var(--ink-900); color: #e2e8f0; padding: 16px; border-radius: var(--radius-sm); overflow-x: auto; font-family: var(--font-mono); font-size: 0.85rem; }
.prose code { font-family: var(--font-mono); background: var(--ink-100); padding: 2px 6px; border-radius: 4px; }
.prose ul, .prose ol { padding-left: 1.4em; }

/* ---------- Mobile nav ---------- */
@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .main-nav {
    position: absolute; top: 72px; left: 0; right: 0; background: #fff;
    flex-direction: column; padding: 10px; border-bottom: 1px solid var(--border);
    display: none; box-shadow: var(--shadow-md);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; }
}

/* ---------- Utility ---------- */
.flex { display: flex; align-items: center; }
.gap-8 { gap: 8px; } .gap-12 { gap: 12px; } .gap-20 { gap: 20px; }
.mt-0 { margin-top: 0; } .mb-0 { margin-bottom: 0; }
.text-center { text-align: center; }