:root{--zemin:#0F1B2E;--zemin2:#1b2f52;--vurgu:#F5821F;--yazi:#f4f6fb;--soluk:#aab6cc;--cizgi:rgba(127,140,170,.28);--kart:rgba(255,255,255,.05)}
@media (prefers-color-scheme:light){:root{--zemin:#f6f8fc;--zemin2:#e6ecf7;--yazi:#0F1B2E;--soluk:#4a5a78;--kart:rgba(15,27,46,.04)}}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;font-family:"Avenir Next","Segoe UI",system-ui,-apple-system,Roboto,"Noto Sans",sans-serif;background:radial-gradient(1200px 600px at 80% -10%,var(--zemin2),var(--zemin)) fixed;color:var(--yazi);line-height:1.6;min-height:100vh}
a{color:inherit}
.sar{max-width:1100px;margin:0 auto;padding:0 20px}
.atla{position:absolute;left:-9999px;top:8px;background:var(--vurgu);color:#fff;padding:10px 16px;border-radius:8px;z-index:100}
.atla:focus{left:12px}

/* üst menü */
.ust{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--zemin) 88%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--cizgi)}
.ust .sar{display:flex;align-items:center;gap:20px;min-height:64px}
.marka img{height:38px;width:auto;display:block;background:#0b1424;border-radius:10px;padding:4px 9px}
.menu{display:flex;align-items:center;gap:6px;margin-left:auto}
.menu a{text-decoration:none;padding:9px 14px;border-radius:999px;font-weight:600;font-size:.95rem;color:var(--soluk)}
.menu a:hover{color:var(--yazi);background:var(--kart)}
.menu a.btn{background:var(--vurgu);color:#fff;margin-left:6px}
.menu a.btn:hover{filter:brightness(1.08);background:var(--vurgu)}
.menu a:focus-visible,.dugme:focus-visible,.menu-ac:focus-visible{outline:3px solid var(--vurgu);outline-offset:2px}
.menu-ac{display:none;margin-left:auto;width:44px;height:44px;border:1px solid var(--cizgi);border-radius:12px;background:var(--kart);cursor:pointer;padding:0;align-items:center;justify-content:center;flex-direction:column;gap:5px}
.menu-ac span{display:block;width:20px;height:2px;background:var(--yazi);border-radius:2px;transition:transform .2s,opacity .2s}
.menu-ac[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-ac[aria-expanded="true"] span:nth-child(2){opacity:0}
.menu-ac[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* giriş */
.kahraman{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center;padding:48px 0 36px}
h1{font-size:clamp(1.9rem,5vw,3.1rem);line-height:1.12;margin:0 0 14px;letter-spacing:-.02em}
.alt{font-size:1.1rem;color:var(--soluk);margin:0 0 22px;max-width:34em}
.dugme{display:inline-block;background:var(--vurgu);color:#fff;text-decoration:none;font-weight:700;padding:14px 24px;border-radius:999px;box-shadow:0 8px 24px rgba(245,130,31,.35)}
.dugme:hover{filter:brightness(1.08)}
.dugme.ikinci{background:transparent;color:var(--yazi);border:2px solid var(--cizgi);box-shadow:none;margin-left:10px}
.saat{display:block;margin-top:14px;color:var(--soluk);font-size:.95rem}
.gorsel{justify-self:center;max-width:300px;width:100%}
.gorsel img{width:100%;height:auto;border-radius:22px;display:block;box-shadow:0 20px 50px rgba(0,0,0,.35)}

/* bölümler */
section{padding:34px 0}
.baslik h2{font-size:clamp(1.5rem,3.6vw,2.1rem);margin:0 0 6px;letter-spacing:-.01em}
.baslik p{margin:0 0 22px;color:var(--soluk);max-width:46em}

/* ders kartları */
.dersler{display:flex;gap:16px;padding:4px 20px 18px;margin:0 -20px;list-style:none;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:thin}
.dersler>li{flex:0 0 210px;scroll-snap-align:start}
.ders{background:var(--kart);border:1px solid var(--cizgi);border-radius:16px;overflow:hidden;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}
.ders.bugun{border-color:var(--vurgu);box-shadow:0 0 0 2px var(--vurgu)}
.ders .durum{position:absolute;right:10px;top:10px;background:#fff;color:#0F1B2E;font-weight:800;font-size:.75rem;padding:4px 10px;border-radius:999px}
.ders.bugun .durum{background:var(--vurgu);color:#fff}
.ders .kapak{position:relative;aspect-ratio:9/16;background:#0b1424}
.ders .kapak img{width:100%;height:100%;object-fit:cover;display:block}
.ders .no{position:absolute;left:10px;top:10px;background:var(--vurgu);color:#fff;font-weight:800;font-size:.78rem;letter-spacing:.04em;padding:4px 10px;border-radius:999px;box-shadow:0 4px 12px rgba(0,0,0,.35)}
.ders .metin{padding:14px 14px 16px}
.ders .tarih{display:block;color:var(--vurgu);font-weight:700;font-size:.82rem;margin-bottom:4px}
.ders h3{font-size:1rem;margin:0 0 6px;line-height:1.3}
.ders p{margin:0;color:var(--soluk);font-size:.9rem;line-height:1.5}
.dersler>.yakinda{min-height:0;border:2px dashed var(--cizgi);border-radius:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:22px;color:var(--soluk);min-height:260px}
.yakinda strong{display:block;color:var(--vurgu);font-size:1.05rem;margin-bottom:8px}
.alt-not{margin:22px 0 0;display:flex;flex-wrap:wrap;gap:12px;align-items:center;color:var(--soluk)}

/* seri kartları */
.kartlar{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.kart{background:var(--kart);border:1px solid var(--cizgi);border-radius:16px;padding:20px}
.kart h3{font-size:1.05rem;margin:0 0 6px;color:var(--vurgu)}
.kart p{margin:0;color:var(--soluk);font-size:.97rem}

/* iletişim */
.iletisim{margin:0;padding:26px;border:1px solid var(--cizgi);border-radius:16px;background:var(--kart)}
.iletisim h2{margin:0 0 6px;font-size:1.35rem}
.iletisim p{margin:0 0 14px;color:var(--soluk)}
.iletisim a.posta{color:var(--vurgu);font-weight:700;text-decoration:none}
.iletisim a.posta:hover{text-decoration:underline}
.iletisim label{display:block;margin:0 0 12px;font-weight:600;font-size:.95rem}
.iletisim input,.iletisim textarea{display:block;width:100%;margin-top:6px;padding:12px 14px;font:inherit;color:var(--yazi);background:rgba(127,140,170,.12);border:1px solid rgba(127,140,170,.4);border-radius:10px}
.iletisim input:focus,.iletisim textarea:focus{outline:3px solid var(--vurgu);outline-offset:1px}
.iletisim textarea{resize:vertical;min-height:120px}
.iletisim .bal{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.iletisim button{background:var(--vurgu);color:#fff;font:inherit;font-weight:700;border:0;padding:13px 26px;border-radius:999px;cursor:pointer}
.iletisim button:disabled{opacity:.6;cursor:wait}
#il-durum{margin:12px 0 0;min-height:1.4em}
#il-durum.tamam{color:#3ec27a}#il-durum.hata{color:#ff6b6b}
.iletisim .gizlilik{margin:12px 0 0;font-size:.85rem}

footer{border-top:1px solid var(--cizgi);padding:24px 0 40px;color:var(--soluk);font-size:.88rem;margin-top:20px}
footer p{margin:0 0 6px}
footer a{text-decoration:none;color:var(--vurgu);font-weight:600}

@media (max-width:820px){
  .menu-ac{display:flex}
  .menu{position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;gap:0;margin:0;padding:10px 16px 16px;background:var(--zemin);border-bottom:1px solid var(--cizgi);display:none}
  .menu.acik{display:flex}
  .menu a{padding:13px 14px;border-radius:12px;font-size:1rem}
  .menu a.btn{margin:8px 0 0;text-align:center}
  .kahraman{grid-template-columns:1fr;gap:22px;padding-top:28px}
  .gorsel{order:-1;max-width:210px}
  .kartlar{grid-template-columns:1fr}
  .dugme.ikinci{margin:10px 0 0;display:block;text-align:center}
}
@media (max-width:480px){.dersler>li{flex-basis:62vw}.ders .metin{padding:10px 10px 12px}.ders h3{font-size:.92rem}.ders p{font-size:.82rem}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

.istem{margin:26px 0 0;max-width:30em;display:grid;gap:8px}
.istem p{margin:0;padding:12px 16px;border-radius:18px;font-size:.98rem;line-height:1.45;max-width:88%}
.istem .sen{justify-self:end;background:var(--vurgu);color:#fff;border-bottom-right-radius:4px}
.istem .yz{justify-self:start;background:var(--kart);border:1px solid var(--cizgi);border-bottom-left-radius:4px}
.istem figcaption{color:var(--soluk);font-size:.85rem;margin-top:2px}
.seri-liste{margin:0;display:grid;grid-template-columns:minmax(150px,.35fr) 1fr;border-top:1px solid var(--cizgi)}
.seri-liste dt,.seri-liste dd{margin:0;padding:18px 0;border-bottom:1px solid var(--cizgi)}
.seri-liste dt{font-weight:800;font-size:1.05rem;padding-right:20px}
.seri-liste dd{color:var(--soluk);max-width:46em}
@media (max-width:620px){.seri-liste{grid-template-columns:1fr}.seri-liste dt{padding-bottom:0;border-bottom:0}.seri-liste dd{padding-top:6px}}
@media (prefers-reduced-motion:no-preference){.istem p{animation:belir .5s both}.istem .yz{animation-delay:.7s}@keyframes belir{from{opacity:0;transform:translateY(8px)}}}