/* PC Pal — Elderly-Friendly Global Styles */
/* Designed for maximum readability and ease of use */

:root {
  /* Color palette */
  --color-bg: #f5f5f5;
  --color-text: #1a1a2e;
  --color-text-light: #4a4a6a;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-success: #16a34a;
  --color-success-light: #dcfce7;
  --color-warning: #d97706;
  --color-warning-light: #fef3c7;
  --color-danger: #dc2626;
  --color-danger-light: #fee2e2;
  --color-white: #ffffff;
  --color-border: #d1d5db;
  --color-surface: #ffffff;
  --color-surface-alt: #f0f0f8;
  --color-shadow: rgba(26, 26, 46, 0.12);

  /* Typography */
  --font-family: 'Segoe UI', system-ui, -apple-system, Arial, sans-serif;
  --font-size-base: 18px;
  --font-size-sm: 16px;
  --font-size-md: 20px;
  --font-size-lg: 24px;
  --font-size-xl: 30px;
  --font-size-2xl: 36px;
  --line-height: 1.6;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* Touch targets */
  --touch-target: 48px;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  /* Transitions */
  --transition: 200ms ease;
}

/* Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

#root {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  line-height: 1.3;
  font-weight: 700;
}

h1 { font-size: var(--font-size-2xl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-lg); }
h4 { font-size: var(--font-size-md); }

p {
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
}

/* Large, accessible buttons */
button {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  font-weight: 600;
  min-height: var(--touch-target);
  min-width: var(--touch-target);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition), transform var(--transition),
    box-shadow var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  line-height: 1.2;
}

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

button:active {
  transform: scale(0.98);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Primary button */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-dark);
  box-shadow: 0 4px 12px var(--color-shadow);
}

/* Secondary button */
.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-text);
  border: 2px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-surface-alt);
  border-color: var(--color-primary);
}

/* Large, readable input fields */
input[type="text"],
input[type="email"],
textarea {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  color: var(--color-text);
  background-color: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md) var(--spacing-lg);
  width: 100%;
  min-height: var(--touch-target);
  transition: border-color var(--transition), box-shadow var(--transition);
  line-height: var(--line-height);
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

input::placeholder,
textarea::placeholder {
  color: var(--color-text-light);
  opacity: 0.8;
}

/* Links */
a {
  color: var(--color-primary);
  text-decoration: underline;
}

a:hover {
  color: var(--color-primary-dark);
}

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

/* Animations — smooth, non-jarring */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 300ms ease forwards;
}

.animate-slide-up {
  animation: slideUp 350ms ease forwards;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}