@import url('https://fonts.googleapis.com/css2?family=Inter+Tight:wght@600;700;800;900&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-deep: #FFFFFF;
  --bg-surface: #F8F9FA;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8F9FA;
  --border-subtle: rgba(0,0,0,0.08);
  --border-accent: rgba(37,99,235,0.25);
  --text-primary: #111827;
  --text-secondary: #4B5563;
  --text-muted: #9CA3AF;
  --accent: #2563EB;
  --accent-glow: rgba(37,99,235,0.1);
  --accent-bright: #3B82F6;
  --accent-cyan: #0EA5E9;
  --gradient-start: #2563EB;
  --gradient-end: #0EA5E9;
  --nav-bg-scrolled: rgba(255,255,255,0.85);
  --menu-bg: #FFFFFF;
  --orb1-color: rgba(37,99,235,0.06);
  --orb2-color: rgba(14,165,233,0.05);
  --font-heading: 'Inter Tight', serif;
  --font-body: 'Inter', sans-serif;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--text-primary);
  background: var(--bg-deep);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── Nav ── */
nav.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1rem 2rem;
  transition: background 0.3s ease, border-color 0.3s ease;
  background: transparent;
}

nav.site-nav.scrolled {
  background: var(--nav-bg-scrolled);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text-primary);
}

.nav-links a[aria-current="page"] {
  font-weight: 600;
}

/* Nav CTA (last nav item) */
.nav-links a.nav-cta {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff !important;
  padding: 0.45rem 1.1rem;
  border-radius: 8px;
  font-weight: 700;
  letter-spacing: 0.01em;
  border-bottom: none !important;
  box-shadow: 0 2px 10px var(--accent-glow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.nav-links a.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
  color: #fff !important;
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 300;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: all 0.3s;
  border-radius: 2px;
}

.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8rem 2rem 6rem;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%; left: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, var(--orb1-color) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 8s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -10%; right: -10%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, var(--orb2-color) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, -30px); }
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  width: 100%;
}

/* ── Sections ── */
.section {
  padding: 6rem 2rem;
  position: relative;
}

.section-alt {
  background: var(--bg-surface);
}

.section-inner {
  max-width: 800px;
  margin: 0 auto;
}

/* ── Prose (hero + sections) ── */
.hero-content h1,
.section-inner h1,
main h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.hero-content h2,
.section-inner h2,
main h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3.5vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-top: 3.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

main h2:first-child { margin-top: 0; }

.hero-content h3,
.section-inner h3,
main h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-top: 2.25rem;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

.hero-content h4,
.section-inner h4,
main h4 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.hero-content h5, .hero-content h6,
.section-inner h5, .section-inner h6,
main h5, main h6 {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-top: 1.5rem;
  margin-bottom: 0.4rem;
}

.hero-content p,
.section-inner p,
main p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
}

.hero-content strong, .section-inner strong, main strong { color: var(--text-primary); font-weight: 600; }
.hero-content em, .section-inner em, main em { color: var(--text-muted); font-style: italic; }

.hero-content img,
.section-inner img,
main img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  display: block;
  margin: 1.5rem auto;
}

.hero-content a,
.section-inner a,
main a {
  color: var(--accent-bright);
  text-decoration: none;
  border-bottom: 1px solid var(--border-accent);
  transition: color 0.2s, border-color 0.2s;
}

.hero-content a:hover,
.section-inner a:hover,
main a:hover {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
}

.section-inner hr,
main hr {
  border: none;
  height: 1px;
  background: var(--border-subtle);
  margin: 3.5rem 0;
}

/* ── CTA button ── */
.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.75rem;
  margin: 1rem 0;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff !important;
  border: none;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none !important;
  border-bottom: none !important;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 4px 18px var(--accent-glow);
  letter-spacing: 0.01em;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--accent-glow);
  color: #fff !important;
}

/* ── Footer ── */
footer.site-footer {
  padding: 3rem 2rem;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  text-align: center;
}

footer.site-footer .nav-links {
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

footer.site-footer .nav-links a {
  font-size: 0.875rem;
}

.footer-copy, .footer-attr {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-attr a {
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
  transition: color 0.2s;
}

.footer-attr a:hover { color: var(--text-secondary); }

/* ── Fade-up animation ── */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ── Mobile ── */
@media (max-width: 768px) {
  .nav-toggle { display: block; }

  .nav-links {
    display: none;
    position: fixed;
    inset: 0;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--menu-bg, var(--bg-deep));
    gap: 0;
    z-index: 200;
  }

  .nav-links.open { display: flex; }

  .nav-links li {
    width: 100%;
    text-align: center;
    border-bottom: 1px solid var(--border-subtle);
  }

  .nav-links li:last-child { border-bottom: none; }

  .nav-links a {
    font-family: var(--font-heading) !important;
    font-size: 1.4rem !important;
    font-weight: 700 !important;
    color: var(--text-primary) !important;
    display: block;
    padding: 1.25rem 0;
  }

  .hero { padding: 6rem 1.5rem 4rem; min-height: 80vh; }
  .section { padding: 4rem 1.5rem; }
}