/* ==========================================================================
   Yardimo temel katman: sifirlama, tipografi, kapsayici, erisilebilirlik
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  overflow-x: hidden;
  overflow-x: clip;
}

body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--ff-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  overflow-x: clip;
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--ff-head);
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  color: var(--c-text);
  text-wrap: balance;
}

h1 { font-size: var(--fs-h1); font-weight: 800; }
h2 { font-size: var(--fs-h2); font-weight: 700; }
h3 { font-size: var(--fs-h3); font-weight: 700; letter-spacing: -0.01em; }

p { margin: 0; }
p, li { text-wrap: pretty; }

ul, ol { margin: 0; padding: 0; list-style: none; }

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
a:hover { color: var(--c-primary-hover); }

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

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  border: 0;
  background: none;
}

code, pre { font-family: var(--ff-mono); }

/* --- Kapsayici --- */
.container {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* --- Yardimci siniflar --- */
.lead {
  font-size: var(--fs-lead);
  color: var(--c-text-2);
  max-width: 62ch;
}

.muted { color: var(--c-text-2); }
.prose { max-width: 65ch; }

.section { padding-block: var(--section-y); }
.section--alt { background: var(--c-bg-alt); }
.section--dark { background: var(--c-dark); color: var(--c-on-dark); }
.section--dark h2 { color: var(--c-on-dark); }
.section--dark p { color: var(--c-on-dark-2); }

/* --- Erisilebilirlik --- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--s-2);
  top: -100px;
  z-index: 200;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: var(--s-1) var(--s-2);
  background: var(--c-primary);
  color: #fff;
  border-radius: var(--r-sm);
  font-weight: 600;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus-visible { top: var(--s-2); color: #fff; }

:focus-visible {
  outline: 3px solid var(--c-primary);
  outline-offset: 2px;
  border-radius: 4px;
}
.section--dark :focus-visible { outline-color: #fff; }

/* --- Hareket tercihi --- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}