Layout, Widths & Grid

• Site container: 1120px (centered)
• Reading column: 68ch (apply to paragraphs and long-form blocks)
• Full-bleed sections: allowed, but keep text inside a container
• Desktop page padding: 32px
• Mobile page padding: 16px
• Grid: 12 columns desktop, 4 columns mobile
• Gutter: 24px desktop, 16px mobile
• Alignment: everything aligns to the same left edge

Copy-paste CSS variables (2025 baseline)

:root{
  /* Fonts (best-practice stacks) */
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Apple Color Emoji","Segoe UI Emoji";
  --font-serif: "Source Serif 4", Literata, ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono","Courier New", monospace;

  /* Layout */
  --container: 1120px;
  --measure: 68ch;

  /* Page padding */
  --pad-mobile: 16px;
  --pad-desktop: 32px;

  /* Grid gutters */
  --gutter-mobile: 16px;
  --gutter-desktop: 24px;

  /* Spacing (8px rhythm) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  /* Radii */
  --radius-sm: 10px;
  --radius: 12px;
  --radius-lg: 16px;

  /* Controls */
  --control-h-mobile: 52px;
  --control-h-desktop: 44px;
  --input-h: 48px;
  --target: 48px;

  /* Type */
  --text-base: 16px;
  --lh-body: 1.55;
  --text-sm: 13px;
  --lh-sm: 1.45;

  /* Surfaces */
  --bg: #F6F7F9;
  --surface: #FFFFFF;

  /* Text */
  --text: #111111;
  --text-2: #4B5563;

  /* Borders */
  --border: #E5E7EB;

  /* Brand / actions */
  --cta: #0047FF;
  --cta-text: #FFFFFF;

  /* Semantics */
  --success: #16A34A;
  --warning: #F59E0B;
  --error: #D72638;
  --info: #2563EB;

  /* Focus ring */
  --focus: #0B5FFF;

  /* Motion */
  --t-fast: 120ms;
  --t: 200ms;
  --t-slow: 300ms;
}

Button baseline CSS (safe default)

.btn-primary{
  min-height: var(--control-h-mobile);
  padding: 0 18px;
  border-radius: var(--radius);
  background: var(--cta);
  color: var(--cta-text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font: 700 var(--text-base)/1 var(--font-sans);
  letter-spacing: -0.01em;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  user-select: none;
  transition: transform var(--t-fast) ease, filter var(--t-fast) ease;
}

.btn-primary:hover{ filter: brightness(0.96); }
.btn-primary:active{ transform: scale(0.99); }

.btn-primary:focus-visible{
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.btn-secondary{
  min-height: var(--control-h-mobile);
  padding: 0 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font: 700 var(--text-base)/1 var(--font-sans);
  text-decoration: none;
  cursor: pointer;
}

.btn-secondary:hover{ background: rgba(0,0,0,0.03); }

.btn-secondary:focus-visible{
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

@media (min-width: 1024px){
  .btn-primary, .btn-secondary{ min-height: var(--control-h-desktop); }
}

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Layout, Widths, Grid, Margins

This completes the width system. It prevents two CTR killers: cramped UI and wandering alignment.