/* Geist yazı tipleri yerelden sunulur (KVKK: Google Fonts'a istek yok).
   Değişken (variable) woff2 dosyaları geist@1.7.2 paketinden alınmıştır; SIL OFL 1.1 lisansı fonts/ içindedir. */
@font-face {
  font-family: "Geist";
  src: url("../fonts/Geist-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Geist Mono";
  src: url("../fonts/GeistMono-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* Yedek fontlar Geist ölçülerine uyarlanır: font geç gelirse metin yeniden satır kırmaz (CLS ≈ 0).
   Değerler tarayıcıda ölçüldü (Geist/Arial genişlik oranı 1,017; Geist Mono ≈ Courier New). */
@font-face {
  font-family: "Geist Fallback";
  src: local("Arial"), local("Liberation Sans");
  size-adjust: 101.7%;
  ascent-override: 99.3%;
  descent-override: 29.5%;
  line-gap-override: 0%;
}

@font-face {
  font-family: "Geist Mono Fallback";
  src: local("Courier New"), local("Liberation Mono");
  size-adjust: 100%;
  ascent-override: 101%;
  descent-override: 30%;
  line-gap-override: 0%;
}

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

html {
  color-scheme: dark;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.58;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }

h1, h2, h3, h4 { color: var(--text); font-weight: 700; }

h1 {
  font-size: clamp(42px, 6vw, 80px);
  line-height: 1.02;
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

h3 { font-size: 22px; line-height: 1.25; letter-spacing: -0.015em; font-weight: 600; }

code, kbd, samp, .mono { font-family: var(--font-mono); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

::selection { background: var(--accent); color: var(--accent-ink); }

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

.section { padding-block: var(--section-y); }
.section--alt { background: var(--bg-alt); border-block: 1px solid var(--border); }

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

.skip-link {
  position: absolute;
  left: 16px; top: -64px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: var(--radius-btn);
  font-weight: 600;
}
.skip-link:focus { top: 12px; }