.rc-root {
    --rc-bg: #f9fafb;
    --rc-card: #fff;
    --rc-border: #e5e7eb;
    --rc-text-primary: #111;
    --rc-text-secondary: #666;
    --rc-accent: #f97316;
    --rc-safe: #10b981;
    --rc-warning: #ef4444;
    --rc-info: #3b82f6;
    --rc-input-bg: #fff;
    --rc-input-border: #d1d5db;
    --rc-input-text: #111;
    --rc-hover: #f3f4f6;
    --rc-select-arrow: #666;
  }

  .theme-dark .rc-root {
    --rc-bg: #111112;
    --rc-card: #1a1a1b;
    --rc-border: #3a3a3c;
    --rc-text-primary: #fff;
    --rc-text-secondary: #a0a0a0;
    --rc-accent: #fb923c;
    --rc-safe: #34d399;
    --rc-warning: #f87171;
    --rc-info: #60a5fa;
    --rc-input-bg: #272729;
    --rc-input-border: #48484a;
    --rc-input-text: #fff;
    --rc-hover: #222;
    --rc-select-arrow: #a0a0a0;
  }

  .rc-card {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    padding: 2rem;
    background: var(--rc-card);
    border: 1px solid var(--rc-border);
    border-radius: 12px;
    color: var(--rc-text-primary);
  }

  .rc-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .rc-sidebar-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }

  .rc-section-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--rc-text-primary);
  }

  .rc-input-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .rc-input-item label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--rc-text-secondary);
  }

  .rc-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .rc-label-row label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--rc-text-secondary);
  }

  .rc-control-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--rc-accent);
  }

  .rc-select,
  .rc-range {
    width: 100%;
    padding: 0.5rem;
    background: var(--rc-input-bg);
    border: 1px solid var(--rc-input-border);
    border-radius: 6px;
    color: var(--rc-input-text);
    font-size: 0.875rem;
  }

  .rc-select {
    cursor: pointer;
    appearance: none;
    background-image: url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="%23666"%3E%3Cpath fill-rule="evenodd" d="M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z" clip-rule="evenodd"/%3E%3C/svg%3E');
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
  }

  .theme-dark .rc-select {
    background-image: url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="%23a0a0a0"%3E%3Cpath fill-rule="evenodd" d="M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z" clip-rule="evenodd"/%3E%3C/svg%3E');
  }

  .rc-select:hover {
    background-color: var(--rc-hover);
  }

  .rc-range {
    cursor: pointer;
    padding: 0.25rem;
    height: 28px;
  }

  .rc-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    cursor: pointer;
    user-select: none;
    color: var(--rc-text-secondary);
  }

  .rc-checkbox input {
    cursor: pointer;
  }

  .rc-safety-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--rc-hover);
    border-radius: 6px;
    font-size: 0.875rem;
    position: relative;
    color: var(--rc-text-secondary);
  }

  .rc-safety-item:hover {
    background: var(--rc-border);
  }

  .rc-main {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .rc-stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .rc-stat {
    display: flex;
    flex-direction: column;
    padding: 1rem;
    background: var(--rc-hover);
    border-radius: 8px;
    text-align: center;
  }

  .rc-stat small {
    font-size: 0.75rem;
    color: var(--rc-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  .rc-stat strong {
    font-size: 1.25rem;
    color: var(--rc-accent);
    margin-top: 0.25rem;
  }

  .rc-timer-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .rc-timer-ring {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0 auto;
  }

  .rc-timer-ring svg {
    width: 100%;
    height: 100%;
  }

  .ring-bg {
    fill: none;
    stroke: var(--rc-border);
    stroke-width: 3;
  }

  .ring-fill {
    fill: none;
    stroke: var(--rc-accent);
    stroke-width: 3;
    stroke-dasharray: 276;
    stroke-dashoffset: 0;
    transform: rotate(-90deg);
    transform-origin: center;
    transition: stroke-dashoffset 0.1s linear;
  }

  .rc-timer-display {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
  }

  .rc-timer-display > span {
    font-size: 2rem;
    font-weight: 700;
    color: var(--rc-text-primary);
  }

  .rc-timer-display small {
    font-size: 0.75rem;
    color: var(--rc-text-secondary);
  }

  .rc-btn-start {
    margin-top: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--rc-accent);
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
  }

  .rc-btn-start:hover {
    transform: scale(1.05);
  }

  .rc-btn-start.running {
    background: var(--rc-warning);
  }

  .rc-chart-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }

  .rc-chart-svg {
    width: 100%;
    height: 200px;
    background: var(--rc-hover);
    border-radius: 8px;
    padding: 0.5rem;
  }

  .grid-line {
    stroke: var(--rc-border);
    stroke-width: 0.5;
  }

  .chart-area {
    fill: url('#gradient');
    opacity: 0.3;
  }

  .chart-path {
    stroke: var(--rc-accent);
    stroke-width: 2;
    fill: none;
  }

  .chart-cursor {
    fill: var(--rc-accent);
  }

  .chart-label-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--rc-text-secondary);
    padding: 0 0.5rem;
  }

  .rc-chart-legend {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--rc-text-secondary);
  }

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

  .dot-line {
    width: 12px;
    height: 2px;
    background: var(--rc-accent);
    border-radius: 1px;
  }

  .dot-point {
    width: 6px;
    height: 6px;
    background: var(--rc-accent);
    border-radius: 50%;
  }

  .rc-alerts {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .rc-alert {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
  }

  .rc-alert.warning {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--rc-warning);
  }

  .rc-alert.info {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    color: var(--rc-info);
  }

  @media (max-width: 1024px) {
    .rc-card {
      grid-template-columns: 1fr;
    }

    .rc-timer-container {
      grid-template-columns: 1fr;
    }

    .rc-stats-row {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (max-width: 640px) {
    .rc-card {
      padding: 1rem;
      gap: 1rem;
    }

    .rc-timer-ring {
      width: 160px;
      height: 160px;
    }

    .rc-timer-display > span {
      font-size: 1.5rem;
    }

    .rc-stats-row {
      grid-template-columns: 1fr;
    }
  }