/*
  NovaTalk design system.
  Colors mirror the Android app's Material palette so the web
  client and the app read as the same product.
*/
:root {
  --color-primary: #2563eb;
  --color-on-primary: #ffffff;
  --color-primary-container: #1e40af;
  --color-on-primary-container: #dbeafe;

  --color-secondary: #94a3b8;
  --color-on-secondary: #0f172a;

  --color-bg: #020617;
  --color-on-bg: #f8fafc;

  --color-surface: #0f172a;
  --color-on-surface: #f8fafc;
  --color-surface-variant: #1e293b;
  --color-on-surface-variant: #94a3b8;

  --color-outline: #334155;
  --color-card: #0b1220;

  --color-error: #ef4444;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-accent: #3b82f6;

  --color-text: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;

  --glass-bg: rgba(255, 255, 255, 0.10);
  --glass-stroke: rgba(255, 255, 255, 0.15);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 999px;

  --shadow-sm: 0 1px 2px rgba(2, 6, 23, 0.4);
  --shadow-md: 0 4px 16px rgba(2, 6, 23, 0.45);
  --shadow-lg: 0 12px 32px rgba(2, 6, 23, 0.5);

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 120ms;
  --duration-base: 200ms;

  --z-header: 100;
  --z-overlay: 500;
  --z-toast: 1000;
  --z-consent: 2000;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-outline); border-radius: var(--radius-full); }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* Buttons */
.nt-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 44px;
  padding: 0 var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--duration-fast) var(--ease), background var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease), opacity var(--duration-fast) var(--ease);
  white-space: nowrap;
}
.nt-btn:active { transform: scale(0.98); }
.nt-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.nt-btn-primary { background: var(--color-primary); color: var(--color-on-primary); }
.nt-btn-primary:hover:not(:disabled) { background: #3b74ee; }

.nt-btn-secondary { background: var(--color-surface-variant); color: var(--color-text); border-color: var(--color-outline); }
.nt-btn-secondary:hover:not(:disabled) { border-color: var(--color-primary); }

.nt-btn-ghost { background: transparent; color: var(--color-text-secondary); }
.nt-btn-ghost:hover:not(:disabled) { color: var(--color-text); background: var(--color-surface-variant); }

.nt-btn-danger { background: transparent; color: var(--color-text-secondary); border-color: var(--color-outline); }
.nt-btn-danger:hover:not(:disabled) { color: var(--color-error); border-color: var(--color-error); }

.nt-btn-icon { width: 44px; height: 44px; padding: 0; border-radius: var(--radius-md); }

.nt-btn-loading { position: relative; color: transparent !important; }
.nt-btn-loading::after {
  content: '';
  position: absolute;
  width: 16px; height: 16px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  color: var(--color-on-primary);
  animation: nt-spin 0.7s linear infinite;
}

@keyframes nt-spin { to { transform: rotate(360deg); } }

/* Toast */
.nt-toast-stack {
  position: fixed;
  top: var(--space-5);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: var(--z-toast);
  width: min(360px, calc(100vw - 32px));
  pointer-events: none;
}
.nt-toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-outline);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: 0.875rem;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity var(--duration-base) var(--ease), transform var(--duration-base) var(--ease);
}
.nt-toast.nt-toast-in { opacity: 1; transform: translateY(0); }
.nt-toast i { font-size: 1rem; color: var(--color-accent); flex-shrink: 0; }
.nt-toast.nt-toast-error i { color: var(--color-error); }
.nt-toast.nt-toast-success i { color: var(--color-success); }

.eyebrow{
  display:flex;align-items:center;gap:.5rem;
  font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.14em;
  font-size:.7rem;color:var(--color-text-muted);font-weight:500
}
.eyebrow::before{content:'';width:14px;height:1px;background:var(--color-primary)}

.nt-modal-overlay{
  position:fixed;inset:0;z-index:var(--z-consent);
  background:rgba(2,6,23,.88);backdrop-filter:blur(6px);
  display:flex;align-items:center;justify-content:center;padding:1.25rem
}
.nt-modal-card{
  background:var(--color-surface);border:1px solid var(--color-outline);
  border-radius:var(--radius-lg);max-width:400px;width:100%;
  padding:1.75rem;text-align:left
}
.nt-modal-icon{width:44px;height:44px;border-radius:var(--radius-sm);background:var(--color-primary-container);display:flex;align-items:center;justify-content:center;font-size:1.2rem;color:var(--color-on-primary-container);margin-bottom:1.1rem}
.nt-modal-card h2{font-size:1.15rem;font-weight:700;letter-spacing:-.01em;margin-bottom:.6rem}
.nt-modal-card p{font-size:.86rem;color:var(--color-text-secondary);line-height:1.6;margin-bottom:1.1rem}
.nt-check-row{display:flex;align-items:flex-start;gap:.6rem;margin-bottom:.9rem;font-size:.83rem;color:var(--color-text-secondary);line-height:1.5;cursor:pointer}
.nt-check-row input{margin-top:.15rem;accent-color:var(--color-primary);width:16px;height:16px;flex-shrink:0}
.nt-check-row a{color:var(--color-primary);text-decoration:underline}
.nt-modal-actions{display:flex;gap:.6rem;margin-top:1.3rem}
.nt-modal-actions .nt-btn{flex:1}
.nt-age-actions{display:flex;flex-direction:column;gap:.6rem;margin-top:1.3rem}

.nt-ad-slot{
  position:relative;display:flex;align-items:center;gap:.75rem;
  background:var(--color-surface);border:1px solid var(--color-outline);
  border-radius:var(--radius-md);padding:.6rem .8rem;cursor:pointer;
  min-height:60px;transition:border-color var(--duration-fast) var(--ease)
}
.nt-ad-slot:hover{border-color:var(--color-primary)}
.nt-ad-slot img{height:44px;width:44px;object-fit:cover;border-radius:var(--radius-sm);flex-shrink:0}
.nt-ad-slot-banner img{height:44px;width:78px}
.nt-ad-label{
  position:absolute;top:-8px;left:10px;background:var(--color-bg);
  padding:0 .4rem;font-family:var(--font-mono);font-size:.62rem;
  text-transform:uppercase;letter-spacing:.08em;color:var(--color-text-muted)
}
.nt-ad-title{font-size:.82rem;color:var(--color-text-secondary);font-weight:500;line-height:1.4}