/* ============================================================
   NERD BASE ONE — Design System
   Dark, confident, technical. Typography as architecture.
   ============================================================ */

:root {
  /* Color -- monochromatic tension + one signature accent */
  --color-bg: #0a0b0d;
  --color-bg-raised: #121417;
  --color-bg-raised-2: #1a1d21;
  --color-text-primary: #f5f4f0;
  --color-text-secondary: rgba(245, 244, 240, 0.65);
  --color-text-tertiary: rgba(245, 244, 240, 0.4);
  --color-border: rgba(245, 244, 240, 0.1);
  --color-accent: #39ff9e;        /* signature circuit-green glow */
  --color-accent-dim: #1f8f5a;
  --color-accent-glow: rgba(57, 255, 158, 0.25);

  /* Type */
  --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Motion -- custom easing only, never linear/ease */
  --ease-expo-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-quart-out: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-expo-in-out: cubic-bezier(0.87, 0, 0.13, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0;
  text-wrap: balance;
}
p { margin: 0 0 1em; }
::selection { background: var(--color-accent); color: var(--color-bg); }

/* ---------- Layout ---------- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}
.section {
  padding: 120px 0;
}
.section--tight { padding: 72px 0; }
@media (max-width: 768px) {
  .section { padding: 72px 0; }
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 11, 13, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: 1280px;
  margin: 0 auto;
}
.site-logo img { height: 40px; width: auto; }
.site-nav ul { display: flex; gap: 36px; align-items: center; }
.site-nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.3s var(--ease-quart-out);
}
.site-nav a:hover { color: var(--color-accent); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-accent);
  color: var(--color-bg) !important;
  padding: 10px 20px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 14px;
  transition: transform 0.3s var(--ease-expo-out), box-shadow 0.3s var(--ease-expo-out);
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 24px var(--color-accent-glow); }
.menu-toggle { display: none; background: none; border: none; color: var(--color-text-primary); font-size: 28px; cursor: pointer; }

@media (max-width: 860px) {
  .site-nav { position: fixed; inset: 72px 0 0 0; background: var(--color-bg); padding: 40px 24px; transform: translateY(-110%); transition: transform 0.4s var(--ease-expo-out); }
  .site-nav.is-open { transform: translateY(0); }
  .site-nav ul { flex-direction: column; align-items: flex-start; gap: 24px; }
  .menu-toggle { display: block; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 100px 0 80px;
  overflow: hidden;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
@media (max-width: 960px) {
  .hero__grid { grid-template-columns: 1fr; }
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 24px;
}
.hero__eyebrow::before {
  content: '';
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 12px var(--color-accent);
}
.hero__title {
  font-size: clamp(2.75rem, 2rem + 3.5vw, 5.5rem);
  margin-bottom: 24px;
}
.hero__title em {
  font-style: normal;
  color: var(--color-accent);
}
.hero__subtitle {
  font-size: clamp(1.05rem, 1rem + 0.3vw, 1.25rem);
  color: var(--color-text-secondary);
  max-width: 48ch;
  margin-bottom: 36px;
}
.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 30px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  transition: transform 0.3s var(--ease-expo-out), box-shadow 0.3s var(--ease-expo-out), background 0.3s var(--ease-quart-out);
}
.btn--primary { background: var(--color-accent); color: var(--color-bg); }
.btn--primary:hover { transform: translateY(-3px); box-shadow: 0 12px 32px var(--color-accent-glow); }
.btn--ghost { border: 1px solid var(--color-border); color: var(--color-text-primary); }
.btn--ghost:hover { border-color: var(--color-accent); color: var(--color-accent); transform: translateY(-3px); }

.hero__visual {
  position: relative;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero__photo {
  width: 100%;
  clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
  position: relative;
  z-index: 2;
}
.hero__glow {
  position: absolute;
  inset: -10%;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 65%);
  z-index: 1;
  filter: blur(20px);
}

/* ---------- Stats bar ---------- */
.stats {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
@media (max-width: 760px) {
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
}
.stat { text-align: center; padding: 40px 16px; }
.stat__number {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.5rem + 2vw, 3rem);
  font-weight: 700;
  color: var(--color-accent);
}
.stat__label {
  font-size: 13px;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 4px;
}

/* ---------- Section headers ---------- */
.section__header { max-width: 640px; margin-bottom: 64px; }
.section__eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
  display: block;
}
.section__title { font-size: clamp(2rem, 1.6rem + 2vw, 3rem); margin-bottom: 16px; }
.section__desc { color: var(--color-text-secondary); font-size: 1.05rem; }

/* ---------- Services grid ---------- */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  overflow: hidden;
}
@media (max-width: 860px) {
  .services__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .services__grid { grid-template-columns: 1fr; }
}
.service-card {
  background: var(--color-bg-raised);
  padding: 40px 32px;
  transition: background 0.4s var(--ease-quart-out);
}
.service-card:hover { background: var(--color-bg-raised-2); }
.service-card__icon {
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-accent-glow);
  border-radius: 12px;
  color: var(--color-accent);
  margin-bottom: 24px;
  font-size: 22px;
}
.service-card__title { font-size: 1.25rem; margin-bottom: 10px; }
.service-card__desc { color: var(--color-text-secondary); font-size: 0.95rem; }

/* ---------- Why us / feature list ---------- */
.feature-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px 48px;
}
@media (max-width: 760px) { .feature-list { grid-template-columns: 1fr; } }
.feature-item { display: flex; gap: 18px; }
.feature-item__mark {
  flex-shrink: 0;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--color-accent-glow);
  color: var(--color-accent);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 14px;
}
.feature-item__title { font-size: 1.05rem; font-weight: 600; margin-bottom: 4px; font-family: var(--font-display); }
.feature-item__desc { color: var(--color-text-secondary); font-size: 0.95rem; margin: 0; }

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--color-bg-raised);
  border-radius: 28px;
  padding: 72px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: '';
  position: absolute;
  top: -50%; left: 50%;
  width: 600px; height: 600px;
  transform: translateX(-50%);
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  pointer-events: none;
}
.cta-band__title { font-size: clamp(1.75rem, 1.4rem + 1.5vw, 2.5rem); margin-bottom: 16px; position: relative; }
.cta-band__desc { color: var(--color-text-secondary); margin-bottom: 32px; position: relative; }
.cta-band .hero__actions { justify-content: center; position: relative; }

/* ---------- Blog cards ---------- */
.blog__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
@media (max-width: 960px) { .blog__grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .blog__grid { grid-template-columns: 1fr; } }
.blog-card {
  display: block;
  border-radius: 16px;
  overflow: hidden;
  background: var(--color-bg-raised);
  border: 1px solid var(--color-border);
  transition: transform 0.4s var(--ease-expo-out), border-color 0.4s var(--ease-quart-out);
}
.blog-card:hover { transform: translateY(-6px); border-color: var(--color-accent); }
.blog-card__media { aspect-ratio: 16/10; overflow: hidden; background: var(--color-bg-raised-2); }
.blog-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--ease-expo-out); }
.blog-card:hover .blog-card__media img { transform: scale(1.06); }
.blog-card__body { padding: 24px; }
.blog-card__date { font-size: 12px; color: var(--color-accent); text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600; }
.blog-card__title { font-size: 1.15rem; margin: 10px 0; font-family: var(--font-display); }
.blog-card__excerpt { color: var(--color-text-secondary); font-size: 0.9rem; }

/* ---------- Contact page ---------- */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
@media (max-width: 860px) { .contact__grid { grid-template-columns: 1fr; } }
.contact-info__item {
  display: flex;
  gap: 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
}
.contact-info__icon {
  width: 44px; height: 44px; flex-shrink: 0;
  border-radius: 12px;
  background: var(--color-accent-glow);
  color: var(--color-accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
}
.contact-info__label { font-size: 13px; color: var(--color-text-tertiary); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 4px; }
.contact-info__value { font-weight: 600; font-size: 1.05rem; }
.contact-map { border-radius: 20px; overflow: hidden; border: 1px solid var(--color-border); aspect-ratio: 4/3; }
.contact-map iframe { width: 100%; height: 100%; border: 0; filter: grayscale(0.3) invert(0.92) contrast(0.9); }

/* ---------- Single post / page prose ---------- */
.prose {
  max-width: 70ch;
  margin: 0 auto;
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
}
.prose h1, .prose h2, .prose h3 { color: var(--color-text-primary); margin: 1.6em 0 0.6em; }
.prose h1 { font-size: 2rem; }
.prose h2 { font-size: 1.6rem; }
.prose h3 { font-size: 1.3rem; }
.prose img { border-radius: 16px; margin: 2em 0; }
.prose a { color: var(--color-accent); text-decoration: underline; text-underline-offset: 3px; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1.2em; }
.post-hero { padding: 64px 0 40px; text-align: center; }
.post-hero__meta { color: var(--color-accent); font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; font-weight: 600; margin-bottom: 20px; }
.post-hero__title { font-size: clamp(2rem, 1.6rem + 2vw, 3rem); max-width: 20ch; margin: 0 auto; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 72px 0 32px;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}
@media (max-width: 760px) { .footer__grid { grid-template-columns: 1fr; gap: 32px; } }
.footer__logo img { height: 36px; margin-bottom: 16px; }
.footer__desc { color: var(--color-text-tertiary); font-size: 0.9rem; max-width: 36ch; }
.footer__heading { font-size: 13px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-text-tertiary); margin-bottom: 20px; }
.footer__links li { margin-bottom: 12px; }
.footer__links a { color: var(--color-text-secondary); font-size: 0.95rem; transition: color 0.3s; }
.footer__links a:hover { color: var(--color-accent); }
.footer__bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 32px; border-top: 1px solid var(--color-border);
  font-size: 13px; color: var(--color-text-tertiary); flex-wrap: wrap; gap: 12px;
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-expo-out), transform 0.8s var(--ease-expo-out);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }