/* Reset, variables – modern UI */
:root {
  --color-bg: #f1f5f9;
  --color-bg-subtle: #f8fafc;
  --color-surface: #ffffff;
  --color-primary: #0ea5e9;
  --color-primary-dark: #0284c7;
  --color-primary-light: #38bdf8;
  --color-primary-gradient: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-error: #dc2626;
  --color-success: #16a34a;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 2.5rem;
  --radius: 0.875rem;
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 1.75rem;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.07), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-focus: 0 0 0 3px rgba(14, 165, 233, 0.25);
  --min-touch: 44px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.25s cubic-bezier(0.33, 1, 0.68, 1);
  --max-card: 400px;
}

*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.01em;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); text-decoration: underline; }
input, button, select, textarea { font: inherit; font-size: 16px; }
img { max-width: 100%; height: auto; display: block; }
@media (max-width: 480px) {
  body { font-size: 15px; }
}

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--space-md); }
.main { min-height: calc(100vh - 64px); padding: var(--space-xl) 0; }

h1 { font-size: 1.75rem; font-weight: 700; color: var(--color-text); margin: 0 0 var(--space-md); letter-spacing: -0.025em; }
h2 { font-size: 1.375rem; font-weight: 600; margin: 0 0 var(--space-sm); letter-spacing: -0.02em; }
h3 { font-size: 1.125rem; font-weight: 600; margin: 0 0 var(--space-xs); }

/* Auth pages: center card */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--space-xl);
}

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

/* Dark theme (optional toggle) */
.theme-dark {
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-border: #334155;
}

.theme-dark .form-control { background: #334155; border-color: #475569; color: #f1f5f9; }
.theme-dark .card { background: var(--color-surface); border-color: var(--color-border); }
.theme-dark .nav { background: var(--color-surface); border-color: var(--color-border); }
.theme-dark .btn-secondary { background: #334155; border-color: #475569; color: #f1f5f9; }

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