/* ============================================================
   Opus AI — Design System
   Premium dark glassmorphism theme
   ============================================================ */

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

/* ─── CSS Custom Properties ──────────────────── */
:root {
  /* Palette */
  --opus-bg-primary: #07070f;
  --opus-bg-secondary: #0d0d1a;
  --opus-bg-tertiary: #12122a;
  --opus-bg-glass: rgba(15, 15, 35, 0.65);
  --opus-bg-glass-hover: rgba(20, 20, 45, 0.75);
  --opus-bg-card: rgba(18, 18, 42, 0.7);

  --opus-border: rgba(120, 90, 255, 0.15);
  --opus-border-hover: rgba(120, 90, 255, 0.35);
  --opus-border-active: rgba(167, 139, 250, 0.6);

  --opus-text-primary: #f0eef6;
  --opus-text-secondary: #9b95b0;
  --opus-text-muted: #625d78;

  /* Accent colors */
  --opus-violet: #7c3aed;
  --opus-violet-light: #a78bfa;
  --opus-violet-glow: rgba(124, 58, 237, 0.3);
  --opus-indigo: #6366f1;
  --opus-emerald: #34d399;
  --opus-emerald-glow: rgba(52, 211, 153, 0.2);
  --opus-rose: #f43f5e;
  --opus-rose-glow: rgba(244, 63, 94, 0.2);
  --opus-amber: #fbbf24;
  --opus-amber-glow: rgba(251, 191, 36, 0.2);
  --opus-sky: #38bdf8;

  /* Gradients */
  --opus-gradient-primary: linear-gradient(135deg, #7c3aed 0%, #6366f1 50%, #38bdf8 100%);
  --opus-gradient-card: linear-gradient(145deg, rgba(124, 58, 237, 0.08) 0%, rgba(18, 18, 42, 0.5) 100%);
  --opus-gradient-glow: radial-gradient(ellipse at 50% 0%, rgba(124, 58, 237, 0.15) 0%, transparent 70%);
  --opus-gradient-mesh: radial-gradient(at 20% 80%, rgba(99, 102, 241, 0.12) 0%, transparent 50%),
                        radial-gradient(at 80% 20%, rgba(124, 58, 237, 0.1) 0%, transparent 50%),
                        radial-gradient(at 50% 50%, rgba(56, 189, 248, 0.06) 0%, transparent 50%);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 24px var(--opus-violet-glow);
  --shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.05);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --sidebar-width: 320px;
  --header-height: 64px;
}

/* ─── Reset & Base ──────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--opus-bg-primary);
  color: var(--opus-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ─── Typography ──────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }

p { color: var(--opus-text-secondary); }

a {
  color: var(--opus-violet-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--opus-text-primary); }

code, pre, .mono {
  font-family: var(--font-mono);
}

/* ─── Scrollbar ──────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(120, 90, 255, 0.25);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: rgba(120, 90, 255, 0.4); }

/* ─── Selection ──────────────────── */
::selection {
  background: rgba(124, 58, 237, 0.4);
  color: #fff;
}