/* Global styles — design tokens from PENCIL_DESIGN_GUIDE.md */

:root {
  --color-primary: #2c3e50;
  --color-secondary: #3498db;
  --color-accent: #e74c3c;
  --color-success: #27ae60;
  --color-white: #ffffff;
  --color-gray: #7f8c8d;
  --color-light: #ecf0f1;
  --color-dark: #34495e;

  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', Monaco, Menlo, monospace;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-main);
  color: var(--color-primary);
  background: var(--color-light);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-md);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: var(--radius-md);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 120ms ease, transform 60ms ease;
  background: var(--color-light);
  color: var(--color-primary);
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--color-secondary); outline-offset: 2px; }

.btn-primary { background: var(--color-primary); color: var(--color-white); }
.btn-primary:hover { background: var(--color-dark); }

.btn-secondary { background: var(--color-secondary); color: var(--color-white); }
.btn-secondary:hover { background: #2980b9; }

.btn-ghost { background: transparent; color: var(--color-primary); }
.btn-ghost:hover { background: var(--color-light); }

.btn[aria-pressed="true"] { background: var(--color-primary); color: var(--color-white); }

.ad-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60px;
  margin: var(--space-md) 0;
  padding: var(--space-sm);
  background: transparent;
  border: 1px dashed #ddd;
  color: var(--color-gray);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}