/* tesisbul.com — ortak temel
   Yön: sanayi yapısı. Beton grisi zemin, mürekkep lacivert yazı,
   tek vurgu olarak zemin işaretlemesindeki sinyal sarısı.
   Logo geometrisi 1:2 eğimli bant ve iki ev formundan oluşur. */
:root {
  --bg: #e8eaeb;          /* beton */
  --surface: #f6f7f7;
  --ink: #18212a;
  --muted: #56616b;
  --line: #c3c9ce;
  --signal: #f2b705;      /* zemin işaretleme sarısı */
  --on-signal: #18212a;
  --steel: #2c5877;       /* bağlantı, odak */
  --danger: #b3261e;
  --display: "Barlow Semi Condensed", "Arial Narrow", Arial, sans-serif;
  --body: "Barlow", "Segoe UI", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  --r: 6px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12171c; --surface: #1b2229; --ink: #e5e9ec; --muted: #9aa5ae; --line: #34404a;
    --signal: #f2b705; --on-signal: #12171c; --steel: #86b6d8; --danger: #ff8a80; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #12171c; --surface: #1b2229; --ink: #e5e9ec; --muted: #9aa5ae; --line: #34404a;
  --signal: #f2b705; --on-signal: #12171c; --steel: #86b6d8; --danger: #ff8a80; color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--body); font-size: 17px; line-height: 1.5; -webkit-text-size-adjust: 100%; }
img, svg { max-width: 100%; }
a { color: var(--steel); }
:focus-visible { outline: 3px solid var(--steel); outline-offset: 2px; }
h1, h2, h3 { font-family: var(--display); font-weight: 700; line-height: 1.1; text-wrap: balance; margin: 0; }

/* Üst bar */
.site-header { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10; background: var(--bg); border-bottom: 1px solid var(--line); }
.site-header .in { max-width: 1120px; margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; gap: 12px 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-family: var(--display); font-weight: 700; font-size: 25px; letter-spacing: .01em; }
.brand svg { width: 26px; height: auto; fill: currentColor; flex: none; }
.site-nav { display: flex; gap: 20px; margin-left: auto; }
.site-nav a { color: var(--ink); text-decoration: none; font-weight: 500; }
.site-nav a:hover { color: var(--steel); }
.site-header .tel { font-family: var(--mono); font-size: 15px; color: var(--ink); text-decoration: none; white-space: nowrap; }
@media (max-width: 860px) { .site-nav { display: none; } .site-header .tel { margin-left: auto; } }

/* Düğmeler */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: inherit; font-weight: 600; border-radius: var(--r); padding: 12px 22px; min-height: 48px; cursor: pointer; border: 1.5px solid transparent; text-decoration: none; }
.btn.primary { background: var(--ink); color: var(--surface); }
.btn.primary:hover { background: var(--steel); }
.btn.primary:disabled { opacity: .6; cursor: wait; }
.btn.signal { background: var(--signal); color: var(--on-signal); }
.btn.signal:hover { filter: brightness(1.05); }
.btn.ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn.ghost:hover { border-color: var(--muted); }
.btn.sm { min-height: 40px; padding: 8px 16px; font-size: 15px; }

/* Alt bilgi */
.site-footer { border-top: 1px solid var(--line); }
.site-footer .in { max-width: 1120px; margin: 0 auto; padding: 24px 16px 40px; display: flex; flex-wrap: wrap; gap: 8px 24px; font-size: 14px; color: var(--muted); }
.site-footer a { color: var(--muted); }

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; } }