.arc-container {
    --arc-primary: #0ea5e9;
    --arc-secondary: #8b5cf6;
    --arc-bg: #f8fafc;
    --arc-card-bg: #fff;
    --arc-text: #0f172a;
    --arc-text-muted: #64748b;
    --arc-border: #e2e8f0;
    --arc-input-bg: #f1f5f9;
    --arc-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --arc-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --arc-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

    max-width: 1100px;
    margin: 4rem auto;
    color: var(--arc-text);
  }

  .theme-dark .arc-container {
    --arc-bg: #0f172a;
    --arc-card-bg: #1e293b;
    --arc-text: #f8fafc;
    --arc-text-muted: #94a3b8;
    --arc-border: #334155;
    --arc-input-bg: #0f172a;
  }

  .arc-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  @media (min-width: 992px) {
    .arc-layout {
      grid-template-columns: 420px 1fr;
    }
  }

  .arc-panel {
    background: var(--arc-card-bg);
    border: 1px solid var(--arc-border);
    border-radius: 1.5rem;
    padding: 2.5rem;
    box-shadow: var(--arc-shadow-lg);
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
  }

  .arc-title-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .arc-icon-box {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--arc-primary), var(--arc-secondary));
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
  }

  .arc-panel-title {
    font-size: 1.5rem;
    font-weight: 800;
    margin: 0;
    letter-spacing: -0.025em;
  }

  .arc-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .arc-section-header {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--arc-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
  }

  .arc-input-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 1rem;
  }

  .arc-field {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .arc-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--arc-text-muted);
  }

  .arc-input {
    width: 100%;
    background: var(--arc-input-bg);
    border: 2px solid var(--arc-border);
    border-radius: 1rem;
    padding: 1rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--arc-text);
    text-align: center;
    outline: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .arc-input:focus {
    border-color: var(--arc-primary);
    background: var(--arc-card-bg);
    box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.1);
  }

  .arc-separator {
    font-size: 1.5rem;
    font-weight: 900;
    opacity: 0.3;
    padding-top: 1.5rem;
  }

  .arc-presets {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
  }

  .arc-preset-btn {
    background: var(--arc-input-bg);
    border: 1px solid var(--arc-border);
    border-radius: 0.75rem;
    padding: 0.6rem;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--arc-text);
    cursor: pointer;
    transition: all 0.2s;
  }

  .arc-preset-btn:hover {
    background: var(--arc-primary);
    color: white;
    border-color: var(--arc-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.2);
  }

  .arc-preview-panel {
    background: var(--arc-input-bg);
    border: 1px solid var(--arc-border);
    border-radius: 1.5rem;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
  }

  .arc-preview-header {
    padding: 1.5rem 2rem;
    background: var(--arc-card-bg);
    border-bottom: 1px solid var(--arc-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .arc-preview-title {
    font-size: 1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .arc-badge {
    background: rgba(14, 165, 233, 0.1);
    color: var(--arc-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 800;
  }

  .arc-viewport {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    min-height: 500px;
    background-image: radial-gradient(var(--arc-border) 1px, transparent 1px);
    background-size: 30px 30px;
  }

  .arc-box {
    background: linear-gradient(45deg, var(--arc-primary), var(--arc-secondary));
    border-radius: 1rem;
    box-shadow: var(--arc-shadow-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    transition:
      width 0.5s cubic-bezier(0.34, 1.56, 0.64, 1),
      height 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.2);
    overflow: hidden;
  }

  .arc-box::before {
    content: "";
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='20' height='20' viewBox='0 0 20 20' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23ffffff' fill-opacity='0.1' fill-rule='evenodd'%3E%3Ccircle cx='3' cy='3' r='3'/%3E%3Ccircle cx='13' cy='13' r='3'/%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.2;
  }

  .arc-box-ratio {
    font-size: 2.5rem;
    font-weight: 900;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    z-index: 1;
  }

  .arc-box-res {
    font-size: 0.875rem;
    font-weight: 600;
    opacity: 0.9;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.4rem 1rem;
    border-radius: 2rem;
    margin-top: 1rem;
    z-index: 1;
  }

  .arc-status {
    position: absolute;
    bottom: 1.5rem;
    left: 1.5rem;
    right: 1.5rem;
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--arc-text-muted);
  }

  .arc-status-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .arc-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--arc-primary);
    box-shadow: 0 0 8px var(--arc-primary);
  }