/* ============================================
   BASE STYLES — Mobile First
   ============================================ */

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
  max-width: 100vw;
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
  padding-top: env(safe-area-inset-top, 0);
}

/* iOS input styling fix */
input, textarea, button, select {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  border-radius: 0;
}
button { border-radius: 0; }

/* Focus visible styles for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--accent-1);
  outline-offset: 2px;
  border-radius: 4px;
}
button:focus-visible, a:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent-1);
  outline-offset: 2px;
}

/* iOS momentum scrolling */
.chat__messages,
.nav__links {
  -webkit-overflow-scrolling: touch;
}

/* Scrollbar */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 2px; }

/* Container — mobile first */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
}

/* Section — mobile first */
.section {
  padding: 64px 0;
  position: relative;
}

.section__title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section__subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 600px;
}

h1, h2, h3, h4 { line-height: 1.2; }

strong {
  color: var(--text-accent);
  font-weight: 600;
}

/* Buttons — mobile first (full width on mobile) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  text-decoration: none;
  width: 100%;
  min-height: 48px; /* Touch target */
}

.btn--primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
}
.btn--primary:hover {
  background: var(--btn-primary-hover);
  box-shadow: var(--shadow-glow);
}

.btn--outline {
  background: transparent;
  border: 1.5px solid var(--btn-outline-border);
  color: var(--text-accent);
}
.btn--outline:hover {
  background: var(--btn-outline-hover-bg);
}

/* Badge */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.badge--nda {
  background: var(--nda-bg);
  border: 1px solid var(--nda-border);
  color: var(--nda-text);
}
.badge--featured {
  background: var(--accent-glow);
  border: 1px solid var(--border-accent);
  color: var(--text-accent);
}

.mono { font-family: 'JetBrains Mono', monospace; }

/* Canvas */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.nav, .hero, .section, .footer {
  position: relative;
  z-index: 1;
}

/* ============================================
   TABLET+ (768px)
   ============================================ */
@media (min-width: 768px) {
  .container { padding: 0 24px; }
  .section { padding: 100px 0; }
  .section__title { font-size: 2.25rem; }
  .section__subtitle { margin-bottom: 40px; }
  .btn { width: auto; }
}

/* ============================================
   DESKTOP (1024px)
   ============================================ */
@media (min-width: 1024px) {
  .section { padding: 120px 0; }
  .section__title { font-size: 2.75rem; }
  .section__subtitle { margin-bottom: 48px; }

  .btn--primary:hover,
  .btn--outline:hover {
    transform: translateY(-2px);
  }
}