:root{
  --bg: #ffffff;
  --card: #ffffff;
  --text: #1b1f2a;
  --muted: #4b5563;
  --primary: #1f4b99;
  --primary-600:#173a77;
  --ring: rgba(31,75,153,.25);
  --border: #e5e7eb;
  --subtle: #f8fafc;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color:var(--text);
  background: var(--bg);
}
.container{max-width:1100px;margin-inline:auto;padding:0 20px}
.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:16px;top:16px;width:auto;height:auto;background:#000;color:#fff;padding:8px 12px;border-radius:4px}

/* Typography */
h1,h2,h3{font-family: Georgia, "Times New Roman", Times, serif;color:#111827}
h1{font-weight:700;font-size:clamp(28px,4.5vw,38px);line-height:1.2}
h2{font-weight:700;font-size:clamp(22px,3.2vw,28px)}
h3{font-weight:600;font-size:clamp(18px,2.4vw,22px)}
.container{max-width:1100px;margin-inline:auto;padding:0 20px}
.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:16px;top:16px;width:auto;height:auto;background:#000;color:#fff;padding:8px 12px;border-radius:6px}

.site-header{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:0;color:var(--text);text-decoration:none}
.brand-logo{width:28px;height:28px;display:none}
.brand-text{font-weight:700;letter-spacing:.5px}
.site-nav ul{display:flex;gap:16px;list-style:none;margin:0;padding:0;align-items:center}
.site-nav > ul > li{position:relative}
.site-nav a{color:var(--muted);text-decoration:none;padding:10px 6px;border-radius:0;display:inline-flex;align-items:center;gap:6px}
.site-nav a:hover,.site-nav a.active{color:#111827;box-shadow:inset 0 -2px 0 0 var(--primary)}
.has-submenu > a::after{content:"▾";font-size:12px;opacity:.6}
.submenu{position:absolute;top:40px;left:0;min-width:240px;background:#fff;border:1px solid var(--border);border-radius:6px;box-shadow:0 8px 24px rgba(0,0,0,.08);padding:6px;display:none}
.submenu a{width:100%;display:block;padding:8px 10px;border-radius:4px}
.submenu a:hover{background:#f3f4f6}
.has-submenu:hover .submenu{display:block}
.btn{display:inline-block;padding:9px 14px;border-radius:6px;text-decoration:none;border:1px solid var(--border);background:#fff;color:var(--text)}
.btn:hover{border-color:#d1d5db}
.btn-primary{background:var(--primary);border-color:var(--primary);color:white}
.btn-primary:hover{background:var(--primary-600);border-color:var(--primary-600)}
.btn-ghost{background:transparent;border-color:var(--border)}
/* ensure header button text stays white */
.site-nav a.btn{color:#fff}
.site-nav a.btn:hover,.site-nav a.btn:focus{color:#fff;box-shadow:none}

.nav-toggle{display:none;flex-direction:column;gap:4px;background:transparent;border:0}
.nav-toggle .bar{width:22px;height:2px;background:var(--text);display:block;border-radius:2px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

.hero{padding:56px 0;border-bottom:1px solid var(--border);background:var(--subtle)}
.hero-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:32px;align-items:center}
.hero-text h1{margin:0 0 12px;line-height:1.15}
.hero-text p{margin:0 0 18px;color:var(--muted);max-width:64ch}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-card{background:#fff;border:1px solid var(--border);border-radius:6px;padding:16px;display:grid;gap:10px;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.stat{background:#fff;border:1px solid var(--border);border-radius:6px;padding:10px}
.stat-value{font-weight:700}
.stat-label{color:var(--muted);font-size:14px}

.section{padding:36px 0}
.section.alt{background:#fff}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--border);border-radius:6px;padding:16px;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.link{color:var(--text);text-underline-offset:3px}
.list{padding-left:18px}
.badge{display:inline-block;background:#eef2ff;color:#1e3a8a;border:1px solid #e0e7ff;padding:3px 10px;border-radius:999px;margin-right:8px;font-size:12px}

.articles{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.article{background:#fff;border:1px solid var(--border);border-radius:6px;padding:16px;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.article h3{margin-top:0}

/* Featured articles emphasis */
.section.featured{background:transparent;border-top:0;border-bottom:0;padding:16px 0}
.featured-articles{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.article.featured{position:relative;border-left:0;background:#fff;transition:none;padding:12px}
.article.featured h3{font-size:clamp(18px,2vw,22px)}
.article.featured:hover{transform:none;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.badge-featured{position:absolute;top:8px;right:8px;background:#e5e7eb;color:#374151;border-radius:999px;padding:1px 6px;font-size:11px}

/* Collections */
.collection-list{display:grid;grid-template-columns:1fr;gap:20px}
.collection .collection-items{margin:10px 0}
.collection-item{display:flex;flex-direction:column;gap:4px;padding:10px 0;border-bottom:1px solid var(--border)}
.collection-item:last-child{border-bottom:0}

.page{padding:28px 0}
.callout{border:1px dashed var(--border);border-radius:6px;padding:12px;background:#fff}
.people-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.person{display:flex;gap:14px;align-items:center;background:#fff;border:1px solid var(--border);border-radius:10px;padding:14px;box-shadow:0 1px 2px rgba(0,0,0,.04);transition:box-shadow .2s ease, transform .15s ease;border-left:3px solid transparent}
.person:hover{box-shadow:0 8px 24px rgba(0,0,0,.08);transform:translateY(-2px);border-left-color:var(--primary)}
.person strong{font-size:16px}
.avatar{width:48px;height:48px;border-radius:999px;background:linear-gradient(135deg,#eef2ff,#f5f3ff);display:grid;place-items:center;font-weight:700;color:#1f2937;border:1px solid #e5e7eb}
.muted{color:var(--muted)}
.steps{counter-reset:step;list-style:none;padding:0}
.steps li{position:relative;padding-left:36px;margin:10px 0}
.steps li::before{counter-increment:step;content:counter(step);position:absolute;left:0;top:0;width:24px;height:24px;background:var(--primary);color:white;display:grid;place-items:center;border-radius:4px;font-size:14px}

/* PDF viewer */
.pdf-container{border:1px solid var(--border);border-radius:6px;background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.pdf-toolbar{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-bottom:1px solid var(--border);background:#f9fafb;border-radius:6px 6px 0 0}
.pdf-toolbar-right{display:flex;gap:8px}
.pdf-viewer{width:100%;height:70vh;border:0;border-radius:0 0 6px 6px}

.site-footer{border-top:1px solid var(--border);margin-top:40px;padding:20px 0;color:var(--muted);background:#f9fafb}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:18px}
.footer-brand{display:flex;align-items:center;gap:10px}
.footer-brand img{display:none}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;padding-top:10px}

/* Left sidebar (Yazarlar) */
.layout-with-sidebar{display:grid;grid-template-columns:240px 1fr;gap:20px}
.sidebar{border:1px solid var(--border);border-radius:6px;background:#fff;padding:12px;height:fit-content;position:sticky;top:80px}
.sidebar h3{margin:0 0 8px}
.sidebar .nav{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.sidebar .nav a{display:block;padding:8px 10px;border-radius:6px;color:var(--muted);text-decoration:none}
.sidebar .nav a:hover,.sidebar .nav a.active{background:#f3f4f6;color:#111827}

@media (max-width: 900px){
  .hero-inner{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .grid-3,.articles,.people-grid,.footer-grid,.featured-articles{grid-template-columns:1fr}
  .layout-with-sidebar{grid-template-columns:1fr}
  .sidebar{position:static}
  .site-nav{position:absolute;inset:64px 0 auto 0;background:#fff;border-bottom:1px solid var(--border);display:none}
  .site-nav.open{display:block}
  .site-nav ul{flex-direction:column;align-items:flex-start;padding:12px}
  .nav-toggle{display:flex}
  .has-submenu > a::after{content:"▸"}
  .submenu{position:static;display:none;width:100%;background:transparent;border:0;box-shadow:none;padding:0 0 0 10px;margin:4px 0 6px}
  .has-submenu.open .submenu{display:block}
  .site-nav a.btn{width:100%;text-align:center}
  .pdf-viewer{height:65vh}
  .header-inner{height:56px}
}

/* focus ring */
*:focus{outline:2px solid var(--ring);outline-offset:2px}