/* =========================================================
   NEXORA AI — DESIGN TOKENS & BASE
   ========================================================= */

:root {
  /* ---- Color: surfaces ---- */
  --void:        #05060f;
  --bg-deep:     #0a0e1f;
  --bg-panel:    #0e1327;
  --bg-panel-2:  #12172f;
  --glass:       rgba(18, 23, 47, 0.55);
  --glass-light: rgba(255, 255, 255, 0.04);
  --border-soft: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(139, 124, 246, 0.35);

  /* ---- Color: accents ---- */
  --indigo:  #6366f1;
  --violet:  #a855f7;
  --cyan:    #22d3ee;
  --neon:    #8b5cf6;
  --pink:    #ec4899;

  /* ---- Color: text ---- */
  --text-1: #eef0fb;
  --text-2: #b6bcdc;
  --text-3: #7d84a8;
  --text-mono: #9ad4e0;

  /* ---- Gradients ---- */
  --grad-primary: linear-gradient(135deg, var(--indigo) 0%, var(--violet) 55%, var(--pink) 100%);
  --grad-cool:    linear-gradient(135deg, var(--cyan) 0%, var(--indigo) 100%);
  --grad-text:    linear-gradient(90deg, #a5b4fc 0%, #d8b4fe 40%, #67e8f9 100%);
  --grad-border:  linear-gradient(135deg, rgba(99,102,241,.6), rgba(168,85,247,.6), rgba(34,211,238,.5));

  /* ---- Elevation ---- */
  --shadow-sm: 0 2px 12px rgba(0,0,0,.35);
  --shadow-md: 0 12px 40px rgba(0,0,0,.45);
  --shadow-glow: 0 0 40px rgba(139, 92, 246, .25);
  --shadow-glow-cyan: 0 0 40px rgba(34, 211, 238, .2);

  /* ---- Radius ---- */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-pill: 999px;

  /* ---- Type ---- */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* ---- Motion ---- */
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --ease-spring: cubic-bezier(.34, 1.56, .64, 1);
  --t-fast: 180ms;
  --t-med: 320ms;
  --t-slow: 600ms;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--void);
  color: var(--text-1);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--text-1);
}

p { margin: 0; color: var(--text-2); }

a { color: inherit; text-decoration: none; }

button { font-family: var(--font-body); }

::selection { background: var(--violet); color: #fff; }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--indigo), var(--violet));
  border-radius: var(--r-pill);
}

/* Focus visibility for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

.text-gradient {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---- Animated aurora background canvas ---- */
#aurora-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: var(--void);
}

.grain-overlay {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---- Glass utility ---- */
.glass-panel {
  background: var(--glass);
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-lg);
}

.gradient-border {
  position: relative;
  border-radius: var(--r-lg);
}
.gradient-border::before {
  content: '';
  position: absolute;
  inset: 0;
  padding: 1px;
  border-radius: inherit;
  background: var(--grad-border);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: .8;
}

/* ---- Reusable animations ---- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 18px rgba(139,92,246,.35); }
  50% { box-shadow: 0 0 34px rgba(139,92,246,.7); }
}
@keyframes spinSlow {
  from { transform: rotate(0deg); } to { transform: rotate(360deg); }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes ripple {
  to { transform: scale(3); opacity: 0; }
}
@keyframes blink {
  50% { opacity: 0; }
}

.fade-up { animation: fadeUp var(--t-slow) var(--ease-out) both; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---- Skeleton loader ---- */
.skeleton {
  position: relative;
  overflow: hidden;
  background: var(--bg-panel-2);
  border-radius: var(--r-sm);
}
.skeleton::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.06), transparent);
  background-size: 200% 100%;
  animation: shimmer 1.6s infinite;
}

/* ---- Ripple button effect ---- */
.btn-ripple { position: relative; overflow: hidden; }
.ripple-el {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,.5);
  transform: scale(0);
  animation: ripple 600ms var(--ease-out);
  pointer-events: none;
}

/* ---- Logo mark: breathing thinking indicator ---- */
.brand-mark {
  width: 38px; height: 38px;
  border-radius: 12px;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-primary);
  box-shadow: var(--shadow-glow);
  flex-shrink: 0;
}
.brand-mark::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 14px;
  background: conic-gradient(from 0deg, var(--indigo), var(--violet), var(--cyan), var(--indigo));
  z-index: -1;
  animation: spinSlow 5s linear infinite;
  opacity: .55;
  filter: blur(6px);
}
.brand-mark span {
  width: 12px; height: 12px;
  background: #fff;
  border-radius: 50%;
  animation: pulseGlow 2.4s ease-in-out infinite;
}

.brand-word {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}