/* Base: element seviyesi varsayılanlar */
:root {
  --color-primary: #0891b2;
  --color-primary-dark: #0e7490;
  --color-primary-light: #cffafe;
  --color-accent: #22d3ee;
  --color-gray-900: #1f2937;
  --color-gray-700: #374151;
  --color-gray-500: #6b7280;
  --color-gray-200: #e5e7eb;
  --color-gray-100: #f3f4f6;
  --color-white: #ffffff;
  --font-sans: 'Montserrat', system-ui, sans-serif;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(31, 41, 55, 0.08);
}

*,
*::before,
*::after { box-sizing: border-box; }

html { font-size: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-gray-700);
  background-color: var(--color-white);
}

h1, h2, h3, h4 {
  color: var(--color-gray-900);
  font-weight: 800;
  line-height: 1.25;
  margin: 0 0 0.6em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1.1em; }

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

ul, ol { margin: 0 0 1.1em; padding-left: 1.4em; }

table { border-collapse: collapse; width: 100%; margin: 0 0 1.5em; }
th, td { padding: 0.65em 0.85em; border: 1px solid var(--color-gray-200); text-align: left; }
th { background: var(--color-gray-100); color: var(--color-gray-900); }

strong { color: var(--color-gray-900); }

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

button, input, textarea { font-family: inherit; font-size: inherit; }

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

@media (max-width: 640px) {
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.45rem; }
}