/* =========================================================
   NovaAI — Design Tokens & Base
   ========================================================= */

:root {
  /* Primary scale — AI Purple (#6366F1) */
  --color-primary-50:  #F1F1FE;
  --color-primary-100: #DEDFFC;
  --color-primary-200: #C2C3FA;
  --color-primary-300: #8A8BF5;
  --color-primary-400: #4D4FEF;
  --color-primary-500: #6366F1;
  --color-primary-600: #2C2FED;
  --color-primary-700: #1216D3;
  --color-primary-800: #0E11A4;
  --color-primary-900: #0A0C75;
  --color-primary-950: #050638;

  /* Cyan accent */
  --color-cyan-400: #22D3EE;
  --color-cyan-500: #06B6D4;

  /* Semantic tokens — dark mode default */
  --bg: #020617;
  --bg-elevated: #0B1120;
  --surface: rgba(15, 23, 42, 0.55);
  --surface-solid: #0F172A;
  --surface-hover: rgba(30, 41, 59, 0.6);
  --border: rgba(148, 163, 184, 0.14);
  --border-strong: rgba(148, 163, 184, 0.24);
  --text: #F8FAFC;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  --primary: var(--color-primary-500);
  --primary-hover: var(--color-primary-400);
  --primary-glow: rgba(99, 102, 241, 0.35);
  --cyan-glow: rgba(6, 182, 212, 0.28);
  --success: #34D399;
  --warning: #FBBF24;

  /* Typography */
  --font-heading: 'Bricolage Grotesque', ui-sans-serif, system-ui, sans-serif;
  --font-body: 'Onest', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Spacing */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;

  /* Motion */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 20% 10%, rgba(99, 102, 241, 0.18), transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 0%, rgba(6, 182, 212, 0.12), transparent 55%),
    radial-gradient(ellipse 70% 60% at 50% 100%, rgba(99, 102, 241, 0.10), transparent 55%);
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

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

.portfolio-back {
  position: fixed;
  z-index: 1000;
  left: max(16px, env(safe-area-inset-left));
  bottom: max(16px, env(safe-area-inset-bottom));
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 46px;
  padding: 0 16px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: rgba(11, 17, 32, 0.94);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 16px 48px rgba(2, 6, 23, 0.45);
  backdrop-filter: blur(16px);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.portfolio-back:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  background: var(--surface-solid);
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

/* Selection */
::selection {
  background: rgba(99, 102, 241, 0.35);
  color: #fff;
}

/* Reduced motion */
@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;
  }
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (min-width: 1024px) {
  .container {
    padding: 0 32px;
  }
}

/* Visually hidden */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}