/* Tema — varsayılan mor; font tema ile değişebilir */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;600;700&display=swap");

:root{
  --bg: #0f0f14;
  --card: #1a1a24;
  --card-alt: #1e1e2a;
  --card-warm: #222230;
  --text: #e8e8ed;
  --muted: #9ca3af;
  --brand: #8b5cf6;
  --brand-soft: #a78bfa;
  --accent-warm: #a78bfa;
  --line: rgba(255,255,255,.06);
  --line-strong: rgba(255,255,255,.1);
  --shadow: 0 12px 32px rgba(0,0,0,.4);
  --radius: 14px;
  --max: 1100px;
  --strip-hero:   rgba(139,92,246,.06);
  --strip-grid:   rgba(30,27,45,.5);
  --strip-alt:    rgba(139,92,246,.04);
  --strip-footer: rgba(15,15,20,.95);
  --container-pad: 22px;
  --font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  /* Tema ile değişen ek değişkenler */
  --bg-glow-1: rgba(139,92,246,.08);
  --bg-glow-2: rgba(139,92,246,.05);
  --topbar-bg: rgba(15,15,20,.85);
  --brand-badge-bg: linear-gradient(135deg, rgba(139,92,246,.4), rgba(167,139,250,.3));
  --brand-badge-border: rgba(139,92,246,.25);
  --nav-active-border: rgba(139,92,246,.35);
  --nav-active-bg: rgba(139,92,246,.1);
  --lang-active-bg: rgba(139,92,246,.2);
  --cta-border: rgba(139,92,246,.45);
  --cta-bg: rgba(139,92,246,.12);
  --cta-bg-hover: rgba(139,92,246,.18);
  --tag-border: rgba(139,92,246,.2);
  --tag-bg: rgba(139,92,246,.06);
  --card-grid-1-border: rgba(139,92,246,.1);
  --card-grid-3-border: rgba(167,139,250,.08);
  --section-alt-card-border: rgba(139,92,246,.08);
  --btn-primary-border: rgba(139,92,246,.45);
  --btn-primary-bg: rgba(139,92,246,.12);
  --version-border: rgba(139,92,246,.2);
  --version-hover-bg: rgba(139,92,246,.12);
  --version-hover-border: rgba(139,92,246,.35);
  --version-active-bg: rgba(139,92,246,.15);
  --version-active-border: rgba(139,92,246,.4);
}

*{ box-sizing:border-box; }

html, body{
  margin:0;
  padding:0;
}

body{
  font-family: var(--font-family);
  background:
    radial-gradient(1000px 500px at 15% 0%, var(--bg-glow-1), transparent 45%),
    radial-gradient(600px 400px at 85% 10%, var(--bg-glow-2), transparent 40%),
    var(--bg);
  color: var(--text);
}

a{
  color:inherit;
  text-decoration:none;
}

.container{
  max-width:var(--max);
  margin:0 auto;
  padding:var(--container-pad);
}

/* Topbar */
.topbar{
  position:sticky;
  top:0;
  z-index:10;
  backdrop-filter: blur(12px);
  background: var(--topbar-bg);
  border-bottom: 1px solid var(--line);
}

.topbar-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:700;
  letter-spacing:.2px;
}

.brand-badge{
  width:36px;
  height:36px;
  border-radius:12px;
  background: var(--brand-badge-bg);
  border: 1px solid var(--brand-badge-border);
  box-shadow: var(--shadow);
  display: grid;
  place-items: center;
  font-weight: 800;
}

nav{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:center;
}

.navlink{
  padding:10px 12px;
  border-radius:12px;
  color:var(--muted);
  border:1px solid transparent;
}

.navlink:hover{
  color:var(--text);
  border-color:var(--line);
  background: rgba(255,255,255,.03);
}

.navlink.active{
  color: var(--text);
  border-color: var(--nav-active-border);
  background: var(--nav-active-bg);
}

.controls{
  display:flex;
  gap:10px;
  align-items:center;
  flex-wrap:wrap;
}

.pill{
  display:flex;
  gap:6px;
  align-items:center;
  border:1px solid var(--line);
  background: rgba(255,255,255,.03);
  border-radius: 999px;
  padding:6px;
}

.langbtn{
  border:0;
  background: transparent;
  color: var(--muted);
  padding:8px 10px;
  border-radius: 999px;
  cursor:pointer;
  font-weight:600;
}

.langbtn.active{
  color: var(--text);
  background: var(--lang-active-bg);
}

.cta{
  border: 1px solid var(--cta-border);
  background: var(--cta-bg);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 14px;
  cursor: pointer;
  font-weight: 700;
}

.cta:hover{
  background: var(--cta-bg-hover);
}

/* Layout blocks */
.card{
  background: var(--card);
  border: 1px solid var(--line);
  border-bottom: var(--card-border-bottom, 1px solid var(--line));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

/* Kart tonları — OBS tarzı grid kartları */
.grid .card:nth-child(3n+1){
  background: var(--card);
  border-color: var(--card-grid-1-border);
}
.grid .card:nth-child(3n+2){
  background: var(--card-alt);
  border-color: var(--line);
}
.grid .card:nth-child(3n+3){
  background: var(--card-warm);
  border-color: var(--card-grid-3-border);
}

/* Hero bölümü - hafif aydınlık şerit */
.hero{
  background: var(--strip-hero);
  margin-left: calc(-1 * var(--container-pad));
  margin-right: calc(-1 * var(--container-pad));
  padding: 18px var(--container-pad) 24px;
  border-radius: 0 0 var(--radius) var(--radius);
}

/* İkinci grid (hedef kitle vb.) - farklı ton */
.section--alt{
  background: var(--strip-alt);
  margin-left: calc(-1 * var(--container-pad));
  margin-right: calc(-1 * var(--container-pad));
  padding: 20px var(--container-pad) 24px;
  border-radius: var(--radius);
}
.section--alt .card{
  background: var(--card-alt);
  border-color: var(--section-alt-card-border);
}

.page-header{
  margin-top: 18px;
  margin-left: calc(-1 * var(--container-pad));
  margin-right: calc(-1 * var(--container-pad));
  padding: 20px var(--container-pad);
  border-radius: var(--radius);
  background: var(--strip-hero);
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap:16px;
  align-items:stretch;
}

@media (max-width: 920px){
  .page-header{ grid-template-columns:1fr; }
}

/* Home page hero (same layout as page-header, slightly different ratio) */
.hero{
  margin-top: 0;
  display:grid;
  grid-template-columns: 1.25fr .75fr;
  gap:18px;
  align-items:stretch;
}
@media (max-width: 920px){
  .hero{ grid-template-columns:1fr; }
}

.h1,
.title{
  font-size: 34px;
  line-height: 1.15;
  margin: 0 0 10px 0;
  letter-spacing: .2px;
}

.subtitle{
  margin:0 0 14px 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
}

.sep{
  height:1px;
  background: var(--line);
  margin:14px 0;
}

.tags{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:12px;
}

.tag{
  font-size: 13px;
  color: var(--muted);
  border: 1px solid var(--tag-border);
  background: var(--tag-bg);
  padding:8px 10px;
  border-radius: 999px;
}

.grid{
  margin-top: 18px;
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

/* İlk grid için hafif şerit (ana sayfa 3 kapı) */
.section--grid{
  background: var(--strip-grid);
  margin-left: calc(-1 * var(--container-pad));
  margin-right: calc(-1 * var(--container-pad));
  padding: 20px var(--container-pad) 24px;
  border-radius: var(--radius);
  margin-top: 18px;
}

.grid-4{ grid-template-columns: repeat(4, 1fr); }

@media (max-width: 920px){
  .grid{ grid-template-columns:1fr; }
}
@media (max-width: 920px){
  .grid-4{ grid-template-columns:repeat(2, 1fr); }
}
@media (max-width: 600px){
  .grid-4{ grid-template-columns:1fr; }
}

.mini-title{
  font-size: 16px;
  margin:0 0 6px 0;
  letter-spacing:.2px;
}

.mini-text{
  margin:0;
  color:var(--muted);
  line-height:1.6;
}

.h2{
  font-size: 18px;
  margin:0 0 8px 0;
  letter-spacing:.2px;
}

.p{
  margin:0;
  color:var(--muted);
  line-height:1.7;
}

.list{
  margin:10px 0 0 0;
  padding-left:18px;
  color:var(--muted);
  line-height:1.9;
}

.kpi{
  display:grid;
  gap:10px;
}

.kpi-item{
  display:flex;
  justify-content:space-between;
  gap:10px;
  padding:10px 12px;
  border-radius: 14px;
  border:1px solid var(--line);
  background: var(--card-alt);
  color: var(--muted);
}

.kpi-item b{
  color: var(--text);
}

footer,
.footer{
  margin: 28px 0 10px 0;
  padding: 16px var(--container-pad);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
  background: var(--strip-footer);
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.list a{
  color: var(--brand);
  font-weight: 700;
}
.list a:hover{ opacity: .9; }

.contact-form{
  display:grid;
  gap:10px;
  margin-top:10px;
}
.contact-form label{ font-size: 14px; color: var(--muted); }
.contact-form input,
.contact-form textarea{
  width:100%;
  max-width:400px;
  padding:10px 12px;
  border-radius: 12px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.03);
  color: var(--text);
  font: inherit;
}
.contact-form textarea{ resize: vertical; min-height: 80px; }
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 12px;
  border-radius: 14px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.03);
  color: var(--text);
  font-weight:800;
  cursor:pointer;
  font: inherit;
}
.btn.primary{
  border: 1px solid var(--btn-primary-border);
  background: var(--btn-primary-bg);
}
.btn:hover{ opacity:.95; }
.contact-form .btn{ margin-top:6px; }

/* Projeler sayfası — versiyon kıyaslama çubuğu */
.version-switcher{
  margin-top: 14px;
  padding: 14px 18px;
  background: var(--card-alt);
  border: 1px solid var(--version-border);
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.version-switcher .label{
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  margin-right: 8px;
}
.version-switcher a{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 700;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  color: var(--text);
}
.version-switcher a:hover{
  background: var(--version-hover-bg);
  border-color: var(--version-hover-border);
  color: var(--brand-soft);
}
.version-switcher a.active{
  background: var(--version-active-bg);
  border-color: var(--version-active-border);
  color: var(--text);
  pointer-events: none;
}
.version-switcher .desc{
  font-size: 11px;
  color: var(--muted);
  margin-top: 2px;
}
.version-switcher .version-block{
  display: flex;
  flex-direction: column;
}
@media (max-width: 600px){
  .version-switcher{ flex-direction: column; align-items: flex-start; }
}

/* Proje durum göstergesi — nokta renkleri (tüm sayfalarda kullanılabilir) */
.status-row{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}
.status-badge{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
  background: rgba(255,255,255,.03);
}
.status-dot{
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}
.dot-completed{ background: #35c759; }
.dot-funded{ background: #0a84ff; }
.dot-interrupted{ background: #ff9f0a; }
.dot-proposal{ background: #bf5af2; }
.dot-institutional{ background: #64d2ff; }

/* Tema seçici */
.theme-switcher-wrap{
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.theme-switcher-label{
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
}
.theme-switcher-select{
  font: inherit;
  font-size: 13px;
  padding: 6px 10px;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  background: #1a1f2e;
  color: #e8eef8;
  cursor: pointer;
  min-width: 140px;
  appearance: auto;
}
.theme-switcher-select option{
  background: #1a1f2e;
  color: #e8eef8;
}
.theme-switcher-select:hover,
.theme-switcher-select:focus{
  border-color: var(--brand);
  outline: none;
  background: #222836;
  color: #f2f5f7;
}
@media (max-width: 768px), (max-height: 500px){
  .theme-switcher-label{ display: none; }
  .theme-switcher-select{ min-width: 110px; }
}

/* ========== RESPONSIVE ========== */

/* Hamburger butonu — masaüstünde gizli */
.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  padding:0;
  border:1px solid var(--line);
  border-radius:12px;
  background:rgba(255,255,255,.04);
  color:var(--text);
  cursor:pointer;
  flex-shrink:0;
}
.nav-toggle:hover{ background:rgba(255,255,255,.08); }
.nav-toggle svg{ width:22px; height:22px; }
.nav-toggle[aria-expanded="true"] .icon-menu{ display:none; }
.nav-toggle[aria-expanded="true"] .icon-close{ display:block; }
.nav-toggle .icon-close{ display:none; }

/* Tablet ve mobil: hamburger menü — dar ekran VEYA kısa ekran (landscape) */
@media (max-width: 768px), (max-height: 500px){
  :root{ --container-pad: 16px; }
  .nav-toggle{ display:flex; }
  .topbar-inner{ flex-wrap:wrap; }
  .topbar-inner nav,
  .topbar-inner .controls{
    display:none;
    width:100%;
    order:10;
    flex-direction:column;
    gap:8px;
    padding:16px 0 20px;
    border-top:1px solid var(--line);
    margin-top:8px;
  }
  .topbar-inner nav{ align-items:stretch; }
  .topbar-inner .controls{ flex-direction:row; flex-wrap:wrap; }
  body.nav-open .topbar-inner nav,
  body.nav-open .topbar-inner .controls{
    display:flex;
  }
  .navlink{ display:block; padding:12px 14px; text-align:left; }
  .h1, .title{ font-size: 28px; }
  .subtitle{ font-size: 15px; }
}

/* Yatay (landscape) mod — menü açıldığında ekranı kapatmasın, kaydırılabilir */
@media (max-height: 500px){
  .topbar .container{ padding-top: 6px; padding-bottom: 6px; }
  .brand-badge{ width: 30px; height: 30px; font-size: 11px; }
  .nav-toggle{ width: 34px; height: 34px; }
  .nav-toggle svg{ width: 16px; height: 16px; }
  .topbar-inner nav,
  .topbar-inner .controls{
    max-height: 35vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 8px 0 10px;
    margin-top: 4px;
  }
  .navlink{ padding: 6px 10px; font-size: 13px; }
  .pill, .cta{ padding: 6px 10px; font-size: 13px; }
}

/* Küçük mobil */
@media (max-width: 480px){
  :root{ --container-pad: 12px; }
  .brand > div > div:last-child{ display:none; }
  .brand > div{ font-size:13px; }
  .brand-badge{ width:40px; height:40px; font-size:14px; }
  .h1, .title{ font-size: 24px; }
  .subtitle{ font-size: 14px; }
  .card{ padding: 16px; }
  .btn, .navlink, .cta{ padding: 10px 12px; font-size: 14px; }
}

/* TR/EN tek dil gösterme — varsayılan TR; ?lang=en veya data-lang="en" ile EN */
html:not([data-lang="en"]) .lang-en,
html:not([data-lang="en"]) [data-lang="en"],
body:not([data-lang="en"]) .lang-en,
body:not([data-lang="en"]) [data-lang="en"]{ display: none !important; }
html[data-lang="en"] .lang-tr,
html[data-lang="en"] [data-lang="tr"],
body[data-lang="en"] .lang-tr,
body[data-lang="en"] [data-lang="tr"]{ display: none !important; }