:root {
  --bg: #f6f4ef; --card: #ffffff; --text: #1f2421; --muted: #6b6f6a; --line: #e6e1d6; --primary: #2f7d6d; --soft: #e3f0ec;
  --head: rgba(246, 244, 239, 0.88);
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0e1614; --card: #18231f; --text: #ecf2ef; --muted: #9dada6; --line: #27352f; --primary: #4fb39a; --soft: #183a31; --head: rgba(14, 22, 20, 0.88); }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 120px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 18px 64px; }

/* Üst çubuk: kaydırırken yukarıda kalır. Masaüstünde menü sağda, telefonda logonun altında tek satır. */
header {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; flex-wrap: wrap; gap: 10px 12px;
  margin: 0 -18px 18px; padding: 14px 18px 12px;
  background: var(--head); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
header img { width: 38px; height: 38px; border-radius: 11px; }
header > a { color: var(--text); text-decoration: none; font-weight: 800; font-size: 20px; letter-spacing: -0.3px; }
nav { margin-left: auto; display: flex; gap: 4px; padding: 4px; background: var(--card); border: 1px solid var(--line); border-radius: 999px; }
nav a { color: var(--muted); text-decoration: none; font-weight: 700; font-size: 14px; padding: 6px 12px; border-radius: 999px; white-space: nowrap; text-align: center; }
nav a:hover { color: var(--primary); }
nav a[aria-current="page"] { background: var(--soft); color: var(--primary); }

@media (max-width: 640px) {
  header { padding: 12px 16px 10px; margin: 0 -16px 16px; }
  .wrap { padding: 0 16px 48px; }
  nav { order: 3; width: 100%; margin-left: 0; display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 2px; }
  nav a { font-size: 13.5px; padding: 7px 4px; }
}

main { background: var(--card); border: 1px solid var(--line); border-radius: 22px; padding: 26px 22px; }
@media (max-width: 640px) { main { padding: 22px 18px; border-radius: 18px; } }
h1 { font-size: 28px; line-height: 1.2; margin: 0 0 6px; letter-spacing: -0.5px; }
h2 { font-size: 19px; line-height: 1.3; margin: 28px 0 8px; }
h3 { font-size: 16px; margin: 18px 0 6px; }
@media (max-width: 640px) { h1 { font-size: 25px; } h2 { font-size: 18px; } }
p, li { color: var(--text); overflow-wrap: anywhere; }
.muted { color: var(--muted); font-size: 14px; }
a { color: var(--primary); }
ul { padding-left: 20px; }
.lang { display: inline-block; margin: 10px 0 0; font-size: 14px; font-weight: 700; }
.box { background: var(--soft); border-radius: 14px; padding: 14px 16px; margin: 16px 0; }
hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0 28px; }
footer { margin-top: 26px; text-align: center; color: var(--muted); font-size: 13px; line-height: 1.9; }