.nv-container {
    --nv-blue: #3b82f6;
    --nv-green: #10b981;
    --nv-red: #ef4444;
    --nv-surface: #fff;
    --nv-bg-input: #f8fafc;
    --nv-border: #e2e8f0;
    --nv-text: #0f172a;
    --nv-muted: #64748b;

    display: flex;
    justify-content: center;
    padding: 3rem 1rem;
  }

  .theme-dark .nv-container {
    --nv-surface: #1e293b;
    --nv-bg-input: #0f172a;
    --nv-border: #334155;
    --nv-text: #f8fafc;
  }

  .nv-card {
    width: 100%;
    max-width: 440px;
    background: var(--nv-surface);
    border-radius: 1.5rem;
    padding: 2.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--nv-border);
    transition: all 0.3s ease;
  }

  .theme-dark .nv-card {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  }

  .nv-wrapper {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .nv-label {
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--nv-blue);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    text-align: center;
  }

  .nv-input {
    width: 100%;
    background: var(--nv-bg-input);
    border: 2px solid var(--nv-border);
    border-radius: 1rem;
    padding: 1.5rem;
    font-size: 1.8rem;
    font-weight: 900;
    text-align: center;
    color: var(--nv-text);
    text-transform: uppercase;
    outline: none;
    letter-spacing: 0.05em;
    transition: all 0.2s ease;
    box-sizing: border-box;
  }

  .nv-input::placeholder {
    color: #cbd5e1;
    font-size: 1.2rem;
    letter-spacing: normal;
  }

  .theme-dark .nv-input::placeholder {
    color: #334155;
  }

  .nv-input:focus {
    border-color: var(--nv-blue);
    background: var(--nv-surface);
  }

  .nv-wrapper.nv-valid .nv-input {
    border-color: var(--nv-green);
    color: var(--nv-green);
    background: #f0fdf4;
  }

  .theme-dark .nv-wrapper.nv-valid .nv-input {
    background: rgba(6, 78, 59, 0.13);
  }

  .nv-wrapper.nv-invalid .nv-input {
    border-color: var(--nv-red);
    color: var(--nv-red);
    background: #fef2f2;
  }

  .theme-dark .nv-wrapper.nv-invalid .nv-input {
    background: rgba(127, 29, 29, 0.13);
  }

  .nv-status {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
  }

  .nv-status.nv-visible {
    max-height: 2.5rem;
    opacity: 1;
    margin-top: 0.5rem;
  }

  .nv-status-title {
    font-size: 0.85rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--nv-muted);
  }

  .nv-wrapper.nv-valid .nv-status-title {
    color: var(--nv-green);
  }

  .nv-wrapper.nv-invalid .nv-status-title {
    color: var(--nv-red);
  }

  @media (max-width: 480px) {
    .nv-card {
      padding: 1.5rem;
    }

    .nv-input {
      font-size: 1.4rem;
      padding: 1rem;
    }
  }