:root {
  --brand-main: #86efac;
  --brand-alt: oklch(from var(--brand-main) l c calc(h + 36));

  --action-lightness: 0.6;
  --action-chroma: 0.18;
  --hover-step: -0.08;

  --danger-base: #ef4444;

  --surface-main: oklch(from var(--brand-main) 0.99 0.02 h);
  --surface-subtle: oklch(from var(--brand-main) 0.95 0.1 h);
  --surface-elevated: oklch(from var(--brand-main) 0.99 0.05 h);
  --surface-control: oklch(from var(--brand-main) 0.85 0.04 h);
  --surface-hover: oklch(from var(--brand-main) 0.9 0.1 h);

  --action-primary: oklch(from var(--brand-main) var(--action-lightness) var(--action-chroma) h);
  --action-primary-hover: oklch(from var(--action-primary) calc(l - var(--hover-step)) c h);
  --action-secondary: oklch(from var(--brand-alt) var(--action-lightness) var(--action-chroma) h);
  --action-secondary-hover: oklch(from var(--action-secondary) calc(l - var(--hover-step)) c h);

  --text-main: oklch(from var(--brand-main) 0.25 0.02 h);
  --text-muted: oklch(from var(--brand-main) 0.45 0.02 h);
  --text-disabled: oklch(from var(--brand-main) 0.7 0.01 h);
  --text-action: oklch(from var(--brand-main) 0.99 0.02 h);

  --border-main: oklch(from var(--brand-main) 0.9 0.04 h);
  --border-strong: oklch(from var(--brand-main) 0.8 0.06 h);

  --shadow: 0 1px 3px oklch(from var(--brand-main) 0.2 0.05 h / 0.1);
  --shadow-md: 0 4px 12px oklch(from var(--brand-main) 0.2 0.05 h / 0.1);

  --radius: 8px;
  --transition: all 0.3s ease;
}

[data-theme="dark"] {
  --action-lightness: 0.5;
  --action-chroma: 0.18;

  --surface-main: oklch(from var(--brand-main) 0.12 0.02 h);
  --surface-subtle: oklch(from var(--brand-main) 0.16 0.03 h);
  --surface-elevated: oklch(from var(--brand-main) 0.2 0.03 h);
  --surface-control: oklch(from var(--brand-main) 0.4 0.06 h);
  --surface-hover: oklch(from var(--brand-main) 0.24 0.04 h);

  --action-primary-hover: oklch(from var(--action-primary) calc(l + var(--hover-step)) c h);
  --action-secondary-hover: oklch(from var(--action-secondary) calc(l + var(--hover-step)) c h);

  --text-main: oklch(from var(--brand-main) 0.94 0.01 h);
  --text-muted: oklch(from var(--brand-main) 0.75 0.02 h);
  --text-disabled: oklch(from var(--brand-main) 0.5 0.02 h);
  --text-action: oklch(from var(--brand-main) 0.12 0.02 h);

  --border-main: oklch(from var(--brand-main) 0.22 0.04 h);
  --border-strong: oklch(from var(--brand-main) 0.3 0.06 h);

  --shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

ul {
  list-style: none;
  text-indent: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", sans-serif;
  background: var(--surface-main);
  color: var(--text-main);
  min-height: 100vh;
  padding: 16px;
  transition: var(--transition);
  line-height: 1.5;
}