/* ============================================
   NN Infosec — Apple-inspired design system
   ============================================ */

:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --bg-dark: #000000;
  --bg-dark-alt: #1d1d1f;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-on-dark: #f5f5f7;
  --text-on-dark-secondary: #a1a1a6;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --divider: #d2d2d7;
  --radius: 18px;
  --nav-h: 48px;
  --max-w: 980px;
  --max-w-wide: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.5;
}

img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(22, 22, 23, 0.8);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 22px;
}
.nav-logo {
  color: #f5f5f7;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.nav-logo span { color: var(--accent); }
.nav-logo:hover { text-decoration: none; }
.nav-links { display: flex; gap: 36px; list-style: none; }
.nav-links a {
  color: #d6d6d6;
  font-size: 12.5px;
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: #ffffff; text-decoration: none; }

/* ---------- Hero (dark) ---------- */
.hero {
  background: var(--bg-dark);
  color: var(--text-on-dark);
  text-align: center;
  padding: 120px 22px 130px;
  overflow: hidden;
}
.hero .eyebrow {
  color: var(--accent);
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 12px;
}
.hero h1 {
  font-size: clamp(44px, 7vw, 80px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
}
.hero .subhead {
  color: var(--text-on-dark-secondary);
  font-size: clamp(19px, 2.5vw, 28px);
  font-weight: 400;
  letter-spacing: -0.01em;
  max-width: 640px;
  margin: 22px auto 0;
}
.hero .cta-row { margin-top: 36px; display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-size: 17px;
  padding: 12px 26px;
  border-radius: 980px;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
  cursor: pointer;
  border: none;
  font-family: inherit;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-secondary:hover { background: var(--accent); color: #fff; }
.hero .btn-secondary { color: #f5f5f7; border-color: #f5f5f7; }
.hero .btn-secondary:hover { background: #f5f5f7; color: #000; }

/* ---------- Sections ---------- */
.section { padding: 100px 22px; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: var(--bg-dark); color: var(--text-on-dark); }
.section-inner { max-width: var(--max-w); margin: 0 auto; }
.section-inner-wide { max-width: var(--max-w-wide); margin: 0 auto; }

.section-title {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  text-align: center;
}
.section-sub {
  text-align: center;
  color: var(--text-secondary);
  font-size: clamp(17px, 2vw, 21px);
  max-width: 620px;
  margin: 18px auto 0;
}
.section-dark .section-sub { color: var(--text-on-dark-secondary); }

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 60px;
}
.card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 44px 34px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: 0 12px 36px rgba(0, 0, 0, 0.1); }
.section-dark .card { background: var(--bg-dark-alt); box-shadow: none; }
.card .icon { font-size: 40px; margin-bottom: 18px; }
.card h3 { font-size: 24px; font-weight: 600; letter-spacing: -0.02em; margin-bottom: 10px; }
.card p { color: var(--text-secondary); font-size: 16px; }
.section-dark .card p { color: var(--text-on-dark-secondary); }
.card .learn-more { display: inline-block; margin-top: 18px; font-size: 16px; }

/* ---------- Feature rows (services page) ---------- */
.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 90px 0;
  border-bottom: 1px solid var(--divider);
}
.feature:last-child { border-bottom: none; }
.feature h2 { font-size: clamp(28px, 4vw, 44px); font-weight: 700; letter-spacing: -0.025em; line-height: 1.15; }
.feature .tag { color: var(--accent); font-weight: 600; font-size: 15px; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 10px; }
.feature p { color: var(--text-secondary); font-size: 18px; margin-top: 16px; }
.feature ul { margin-top: 20px; list-style: none; }
.feature ul li {
  color: var(--text);
  font-size: 16px;
  padding: 9px 0 9px 30px;
  position: relative;
}
.feature ul li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}
.feature-visual {
  background: linear-gradient(145deg, #1d1d1f, #3a3a3c);
  border-radius: var(--radius);
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 96px;
}
.feature:nth-child(even) .feature-visual { order: -1; }

/* ---------- Stats band ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 40px;
  text-align: center;
  margin-top: 60px;
}
.stats .num { font-size: 52px; font-weight: 700; letter-spacing: -0.03em; color: var(--accent); }
.stats .label { color: var(--text-on-dark-secondary); font-size: 16px; margin-top: 6px; }

/* ---------- CTA banner ---------- */
.cta-banner { text-align: center; }
.cta-banner .btn { margin-top: 34px; }

/* ---------- Enquiry form ---------- */
.form-wrap { max-width: 640px; margin: 60px auto 0; }
.form-group { margin-bottom: 22px; }
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  font-family: inherit;
  font-size: 17px;
  padding: 14px 16px;
  border: 1px solid var(--divider);
  border-radius: 12px;
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.15);
}
.form-group textarea { min-height: 150px; resize: vertical; }
.form-note { color: var(--text-secondary); font-size: 13px; text-align: center; margin-top: 18px; }

/* ---------- Contact strip ---------- */
.contact-strip { text-align: center; margin-top: 70px; }
.contact-strip h3 { font-size: 21px; font-weight: 600; }
.contact-strip p { color: var(--text-secondary); margin-top: 8px; font-size: 17px; }

/* ---------- Footer ---------- */
.footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--divider);
  padding: 34px 22px;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--text-secondary);
  font-size: 12.5px;
}
.footer-links { display: flex; gap: 24px; list-style: none; }
.footer-links a { color: var(--text-secondary); }
.footer-links a:hover { color: var(--text); }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-links { gap: 20px; }
  .hero { padding: 80px 22px 90px; }
  .section { padding: 70px 22px; }
  .feature { grid-template-columns: 1fr; gap: 30px; padding: 60px 0; }
  .feature:nth-child(even) .feature-visual { order: 0; }
  .feature-visual { min-height: 220px; font-size: 72px; }
}

/* ---------- Reveal animation ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .reveal.visible { opacity: 1; transform: none; }
}