/* ===== DESIGN TOKENS ===== */
:root {
  --bg-deep:       #0f0f1a;
  --bg-card:       #1a1a2e;
  --bg-border:     #2a2a4a;
  --text-primary:  #e0e0ff;
  --text-secondary:#a0a0d0;
  --text-muted:    #7a7aa8;
  --accent-purple: #8b84ff;
  --accent-coral:  #ff6584;
  --gradient:      linear-gradient(135deg, #6c63ff, #ff6584);
  --radius:        8px;
  --nav-height:    64px;
  --transition:    0.3s ease;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  background: var(--bg-deep);
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  min-height: 100vh;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ===== SKIP LINK ===== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--accent-purple);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-weight: 700;
  z-index: 9999;
  transition: top 0.2s;
}
.skip-link:focus { top: 1rem; }

/* ===== NAVIGATION ===== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 1.5rem;
  background: rgba(15, 15, 26, 0.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--bg-border);
}
.nav-logo {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text-primary);
  letter-spacing: 1px;
}
.nav-logo span { color: var(--accent-purple); }
.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
  padding-bottom: 2px;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient);
  transition: width var(--transition);
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text-primary);
}
.nav-links a[aria-current="page"]::after,
.nav-links a:hover::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

@media (max-width: 48rem) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    inset: var(--nav-height) 0 0 0;
    background: var(--bg-deep);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    font-size: 1.25rem;
    transform: translateX(100%);
    visibility: hidden;
    z-index: 99;
    transition: transform var(--transition), visibility var(--transition);
  }
  .nav-open .nav-links { transform: translateX(0); visibility: visible; }
  .nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
  .nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* ===== FOOTER ===== */
.site-footer {
  border-top: 1px solid var(--bg-border);
  padding: 2.5rem 1.5rem;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
}
.site-footer a {
  color: var(--accent-purple);
  transition: color var(--transition);
}
.site-footer a:hover { color: var(--text-primary); }
.footer-links {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.footer-disclaimer {
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  max-width: 40rem;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.5;
}

/* ===== UTILITIES ===== */
.container {
  width: 100%;
  max-width: 64rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.section { padding: 5rem 0; }
.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}
.section-subtitle {
  color: var(--text-muted);
  margin-bottom: 3rem;
}
.tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: 4px;
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  color: var(--text-secondary);
}
.btn {
  display: inline-block;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.875rem;
  transition: opacity var(--transition), transform var(--transition);
}
.btn:hover { opacity: 0.85; transform: translateY(-1px); }
.btn-primary {
  background: var(--gradient);
  color: #fff;
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--bg-border);
  color: var(--text-primary);
}

/* ===== SCREEN READER ONLY ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ===== SCROLL REVEAL ===== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ===== FOCUS VISIBLE ===== */
:focus-visible {
  outline: 2px solid var(--accent-purple);
  outline-offset: 3px;
  border-radius: 3px;
}