/* =========================================
   Shared CSS — kuthaygumus.github.io
   System B palette (canonical for all pages)
   ========================================= */

/* ---- Variables ---- */
:root {
    --bg: #fbfbfd;
    --text: #1d1d1f;
    --text-secondary: #424245;
    --text-muted: #86868b;
    --link: #0066cc;
    --link-hover: #004499;
    --rule: rgba(0,0,0,0.08);
    --card-bg: rgba(0,0,0,0.03);
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #111111;
        --text: #f5f5f7;
        --text-secondary: #a1a1a6;
        --text-muted: #6e6e73;
        --link: #2997ff;
        --link-hover: #64b5f6;
        --rule: rgba(255,255,255,0.08);
        --card-bg: rgba(255,255,255,0.04);
    }
}

/* ---- Reset ---- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ---- Body ---- */
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    font-size: 17px;
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ---- Links ---- */
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; border-radius: 3px; }

/* ---- Topbar ---- */
.topbar { border-bottom: 1px solid var(--rule); padding: 14px 0; }
.topbar-inner { max-width: 980px; margin: 0 auto; padding: 0 22px; display: flex; align-items: center; justify-content: space-between; }
.topbar-left { display: flex; align-items: center; gap: 6px; }
.topbar-back { font-size: 14px; color: var(--text-muted); text-decoration: none; transition: color 0.2s; }
.topbar-back:hover { color: var(--link); text-decoration: none; }
.topbar-sep { color: var(--rule); font-size: 18px; font-weight: 300; user-select: none; }
.topbar-brand { font-size: 21px; font-weight: 600; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.topbar-nav { display: flex; gap: 24px; align-items: center; }
.topbar-nav a { font-size: 12px; color: var(--text-muted); text-decoration: none; letter-spacing: 0; transition: color 0.2s; }
.topbar-nav a:hover { color: var(--link); }
.topbar-nav a[aria-current="page"] { color: var(--text); font-weight: 500; }

/* ---- Lang Switch ---- */
.lang-switch { display: flex; align-items: center; gap: 6px; margin-left: 8px; padding-left: 16px; border-left: 1px solid var(--rule); font-size: 14px; }
.lang-switch span { opacity: 1; }
.lang-switch a { text-decoration: none; opacity: 0.45; transition: opacity 0.2s; font-size: 14px; }
.lang-switch a:hover { opacity: 1; text-decoration: none; }

/* ---- Footer ---- */
footer { border-top: 1px solid var(--rule); padding: 20px 0; }
.footer-inner { max-width: 980px; margin: 0 auto; padding: 0 22px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
footer small { font-size: 12px; color: var(--text-muted); }
footer nav { display: flex; gap: 20px; }
footer nav a { font-size: 12px; color: var(--text-muted); text-decoration: none; }
footer nav a:hover { color: var(--link); }

/* ---- Responsive ---- */
@media (max-width: 600px) {
    .topbar-nav { gap: 16px; }
    .footer-inner { flex-direction: column; align-items: flex-start; }
}