/**
 * Dondozo Tools - Base Design System & CSS Variables
 * Light Theme Only (No dark mode)
 */

:root {
  --color-primary: #1d5c96;
  --color-primary-hover: #14436f;
  --color-secondary: #e0633b;
  --color-secondary-hover: #c84e28;
  --color-text: #1e293b;
  --color-muted: #64748b;
  --color-background: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-alt: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-subtle: #f1f5f9;
  --color-success: #0d9488;
  --color-success-bg: #f0fdfa;
  --color-warning: #d97706;
  --color-warning-bg: #fffbeb;
  --color-danger: #dc2626;
  --color-danger-bg: #fef2f2;
  --color-focus: #2563eb;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);

  --container-width: 1200px;
  --content-width: 840px;

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Modern CSS Reset */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-background);
  color: var(--color-text);
}

/* Accessible Focus States */
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.25;
  margin-top: 0;
  margin-bottom: 0.75rem;
}

h1 {
  font-size: clamp(1.85rem, 4vw, 2.5rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  letter-spacing: -0.015em;
  margin-top: 1.75rem;
}

h3 {
  font-size: clamp(1.15rem, 2vw, 1.35rem);
  margin-top: 1.5rem;
}

h4 {
  font-size: 1.1rem;
}

p {
  margin-top: 0;
  margin-bottom: 1.25rem;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
  text-decoration-thickness: 2px;
}

img, svg, video {
  max-width: 100%;
  height: auto;
  display: block;
}

code, pre {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

code {
  background: var(--color-surface-alt);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

pre {
  background: #0f172a;
  color: #f8fafc;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
}

pre code {
  background: transparent;
  padding: 0;
  border: none;
  color: inherit;
}

/* Accessibility Skip Link */
.screen-reader-text {
  border: 0;
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
  word-wrap: normal !important;
}

.screen-reader-text:focus,
.dondozo-skip-link:focus {
  background-color: var(--color-primary);
  color: #ffffff;
  clip: auto !important;
  clip-path: none !important;
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  height: auto;
  left: 1rem;
  top: 1rem;
  line-height: normal;
  padding: 0.75rem 1.25rem;
  text-decoration: none;
  width: auto;
  z-index: 100000;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
}

/* Reduced Motion Preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}