/* ==========================================================================
   Kernel Software — shared stylesheet
   Plain CSS, no build step, no framework. Edit values in :root to re-theme.
   ========================================================================== */

:root {
  --color-primary: #1d4ed8;      /* main brand blue */
  --color-primary-dark: #1e3a8a;
  --color-accent: #0ea5e9;       /* sky accent */
  --color-ink: #0f172a;          /* near-black text */
  --color-ink-soft: #475569;     /* secondary text */
  --color-bg: #ffffff;
  --color-bg-soft: #f8fafc;
  --color-border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
  --shadow-hover: 0 10px 30px rgba(15, 23, 42, 0.10);
  --max-width: 1140px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 16px; font-weight: 700; }
h1 { font-size: clamp(2.1rem, 4vw, 3.2rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); letter-spacing: -0.01em; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 16px; color: var(--color-ink-soft); }
.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}

/* Buttons -------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-dark); box-shadow: var(--shadow-hover); transform: translateY(-1px); }
.btn-outline {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-ink);
}
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-light {
  background: #fff;
  color: var(--color-primary);
}
.btn-light:hover { transform: translateY(-1px); box-shadow: var(--shadow-hover); }

/* Header ----------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.3rem; color: var(--color-ink); }
.logo img { height: 34px; width: auto; }
.logo .wordmark-fallback { color: var(--color-primary); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-ink-soft);
  transition: color 0.15s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--color-primary); }
.nav-cta { display: flex; align-items: center; gap: 20px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span { width: 24px; height: 2px; background: var(--color-ink); border-radius: 2px; }

@media (max-width: 860px) {
  .nav-links { position: fixed; top: 76px; left: 0; right: 0; background: #fff; flex-direction: column; align-items: flex-start; padding: 24px; gap: 20px; border-bottom: 1px solid var(--color-border); transform: translateY(-130%); transition: transform 0.2s ease; }
  .nav-links.open { transform: translateY(0); }
  .nav-toggle { display: flex; }
  .nav-cta .btn-outline { display: none; }
}

/* Hero --------------------------------------------------------------- */
.hero {
  padding: 96px 0 80px;
  background: linear-gradient(180deg, var(--color-bg-soft) 0%, #ffffff 100%);
  border-bottom: 1px solid var(--color-border);
}
.hero .container { max-width: 780px; text-align: center; }
.hero p.lead { font-size: 1.15rem; max-width: 620px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* Trust strip ---------------------------------------------------------- */
.trust-strip { padding: 28px 0; border-bottom: 1px solid var(--color-border); }
.trust-strip .container {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  justify-content: center;
  text-align: center;
}
.trust-item { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 0.9rem; color: var(--color-ink-soft); }
.trust-item svg { flex: none; color: var(--color-primary); }

/* Sections --------------------------------------------------------------- */
section { padding: 80px 0; }
.section-soft { background: var(--color-bg-soft); }
.section-head { max-width: 640px; margin: 0 auto 48px; text-align: center; }

/* Feature grid ----------------------------------------------------------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.card .icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: rgba(29, 78, 216, 0.08);
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.card h3 { margin-bottom: 8px; }
.card p { margin: 0; font-size: 0.95rem; }

/* Two-column layout ----------------------------------------------------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
@media (max-width: 780px) { .split { grid-template-columns: 1fr; gap: 32px; } }
.stat-row { display: flex; gap: 40px; flex-wrap: wrap; margin-top: 24px; }
.stat-row .stat b { display: block; font-size: 1.8rem; color: var(--color-primary); }
.stat-row .stat span { font-size: 0.88rem; color: var(--color-ink-soft); }

/* CTA band --------------------------------------------------------------- */
.cta-band {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  text-align: center;
}
.cta-band h2, .cta-band p { color: #fff; }
.cta-band p { color: rgba(255,255,255,0.85); }

/* Contact page ------------------------------------------------------------ */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; }
@media (max-width: 780px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-detail { display: flex; gap: 14px; margin-bottom: 22px; align-items: flex-start; }
.contact-detail .icon { width: 40px; height: 40px; border-radius: 10px; background: rgba(29,78,216,0.08); color: var(--color-primary); display: flex; align-items: center; justify-content: center; flex: none; }
.contact-detail h4 { margin: 0 0 4px; font-size: 0.95rem; }
.contact-detail p { margin: 0; }

form.contact-form { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 560px) { .form-row { grid-template-columns: 1fr; } }
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 600; font-size: 0.88rem; margin-bottom: 6px; }
.field input, .field textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-family: var(--font);
  font-size: 0.95rem;
  color: var(--color-ink);
  background: var(--color-bg-soft);
}
.field input:focus, .field textarea:focus { outline: 2px solid var(--color-primary); outline-offset: 1px; background: #fff; }
.field textarea { resize: vertical; min-height: 120px; }
.form-note { font-size: 0.82rem; color: var(--color-ink-soft); margin-top: 8px; }

/* List / timeline used on About ------------------------------------------ */
.value-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.value-list li { display: flex; gap: 14px; align-items: flex-start; }
.value-list .icon { width: 34px; height: 34px; border-radius: 8px; background: rgba(29,78,216,0.08); color: var(--color-primary); display: flex; align-items: center; justify-content: center; flex: none; }

/* Footer ------------------------------------------------------------------ */
.site-footer { background: var(--color-ink); color: #cbd5e1; padding: 56px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
@media (max-width: 700px) { .footer-grid { grid-template-columns: 1fr; gap: 28px; } }
.site-footer h4 { color: #fff; font-size: 0.95rem; margin-bottom: 14px; }
.site-footer p { color: #94a3b8; font-size: 0.92rem; }
.footer-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer-links a { color: #94a3b8; font-size: 0.92rem; }
.footer-links a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 22px; font-size: 0.82rem; color: #64748b; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* Page header (non-home pages) -------------------------------------------- */
.page-hero { padding: 64px 0 56px; background: var(--color-bg-soft); border-bottom: 1px solid var(--color-border); text-align: center; }
.page-hero .container { max-width: 700px; }