/* Temel: renk ve yazı tokenları, düzen, başlık, düğmeler, gravür kapak, alt bilgi */
:root{
  --paper:#F2F4F3; --paper-2:#E7ECEA; --card:#FFFFFF; --ink:#10262A; --ink-soft:#4F6265; --teal:#1C7471; --teal-2:#2A9A94; --teal-soft:#D5E8E5; --rule:#C9D3D1;
  --band:#0F2629; --band-fg:#E8EFED; --band-soft:#9DB3B0;
  --sans:"Onest", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono:"IBM Plex Mono", ui-monospace, Menlo, monospace;
  --engrave-filter:none; --engrave-blend:multiply;
  --foot-img:url(../img/foot-lateral.jpg);
  --logo-img:url(../img/logo-mat.png);
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root{--paper:#0C1A1C;--paper-2:#122426;--card:#132729;--ink:#E5EDEB;--ink-soft:#9BB0AD;--teal:#5FC0B8;--teal-2:#7FD3CB;--teal-soft:#16393A;--rule:#24393B;--band:#081315;--band-fg:#E5EDEB;--band-soft:#8FA6A3;--engrave-filter:invert(1);--engrave-blend:screen;color-scheme:dark}
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17px/1.65 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{font-weight:700;letter-spacing:-.03em;text-wrap:balance;margin:0;line-height:1.08}
:focus-visible{outline:2px solid var(--teal);outline-offset:3px}
.wrap{max-width:1260px;margin:0 auto;padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}
.mono{font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-soft)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:12px;top:-60px;z-index:100;background:var(--ink);color:var(--paper);padding:10px 16px;border-radius:8px}
.skip:focus{top:12px}
.plain{text-decoration:none}
.plain:hover{color:var(--teal)}
.center-cta{text-align:center;margin-top:40px}

.btn{display:inline-flex;align-items:center;gap:10px;background:var(--teal);color:#fff;text-decoration:none;padding:14px 22px;border-radius:99px;font-weight:600;font-size:15px;line-height:1.2;border:0;cursor:pointer;transition:transform .2s,background .2s,color .2s}
.btn:hover{transform:translateY(-2px);background:var(--teal-2)}
.btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn.ghost:hover{background:var(--ink);color:var(--paper)}
.btn.light{background:var(--band-fg);color:var(--band)}
.link{color:var(--teal);font-weight:600;text-decoration:none}
.link:hover{text-decoration:underline}

/* Gravür kırpıntısı: tek çizimden tutarlı kapaklar */
.eng{position:relative;overflow:hidden;background:var(--teal-soft)}
.eng::before{content:"";position:absolute;inset:0;background:var(--foot-img) no-repeat;background-size:var(--z,240%);background-position:var(--p,40% 45%);mix-blend-mode:var(--engrave-blend);filter:var(--engrave-filter);transition:background-size .8s cubic-bezier(.2,.7,.2,1)}
a:hover .eng::before{background-size:calc(var(--z,240%) + 30%)}
.eng .lab{position:absolute;left:14px;top:12px;font:500 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;background:var(--card);color:var(--ink);padding:4px 8px;border-radius:4px}
.eng.t2{background:var(--paper-2)}
.eng.t3{background:color-mix(in oklab,var(--teal-soft) 55%,var(--card))}

/* Başlık */
header.top{position:sticky;top:0;z-index:30;background:color-mix(in oklab,var(--paper) 90%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--rule)}
.admin-bar header.top{top:32px}
.nav{display:flex;align-items:center;gap:22px;height:72px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;min-width:0}
.brand .lg{width:44px;height:44px;border-radius:50%;background:#fff var(--logo-img) center/112% no-repeat;border:1px solid var(--rule);flex:none}
.brand b{font-size:17px;font-weight:700;letter-spacing:-.01em;display:block;line-height:1.15;white-space:nowrap}
.brand i{font-style:normal;font-family:var(--mono);font-size:10px;letter-spacing:.12em;color:var(--ink-soft);text-transform:uppercase;white-space:nowrap}
.menu-main{margin-left:auto}
.menu-main ul{display:flex;gap:2px;list-style:none;margin:0;padding:0;font-size:15px}
.menu-main ul a{display:block;text-decoration:none;color:var(--ink-soft);padding:8px 12px;border-radius:99px;transition:.2s}
.menu-main ul a:hover{color:var(--ink);background:var(--paper-2)}
.menu-main ul a[aria-current]{color:var(--ink);background:var(--paper-2);font-weight:600}
.menu-book{display:none}
.lang{display:flex;border:1px solid var(--rule);border-radius:99px;overflow:hidden;flex:none}
.lang a{font:500 12px var(--mono);padding:6px 11px;color:var(--ink-soft);text-decoration:none}
.lang a[aria-current]{background:var(--ink);color:var(--paper)}
.burger{display:none;width:44px;height:44px;border:1px solid var(--rule);border-radius:50%;background:var(--card);cursor:pointer;position:relative;flex:none}
.burger span:not(.sr){position:absolute;left:13px;right:13px;height:1.5px;background:var(--ink);transition:.25s}
.burger span:nth-child(1){top:17px}.burger span:nth-child(2){top:25px}
.burger[aria-expanded=true] span:nth-child(1){top:21px;transform:rotate(45deg)}
.burger[aria-expanded=true] span:nth-child(2){top:21px;transform:rotate(-45deg)}

/* Alt bilgi */
.site-foot{background:var(--band);color:var(--band-fg);padding-block:70px 34px}
.foot{display:grid;grid-template-columns:1.4fr 1fr 1.2fr 1fr;gap:40px}
.foot .lg{width:72px;height:72px;border-radius:50%;background:#fff var(--logo-img) center/112% no-repeat;margin-bottom:18px}
.foot b{font-size:21px;letter-spacing:-.02em}
.foot-desc{color:var(--band-soft);font-size:15px;max-width:36ch}
.foot-h{font:500 11px var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--band-soft);margin:0 0 14px}
.foot ul{list-style:none;margin:0;padding:0;display:grid;gap:8px;font-size:15px}
.foot a{text-decoration:none;color:color-mix(in oklab,var(--band-fg) 85%,transparent);overflow-wrap:anywhere}
.foot a:hover{color:var(--teal-2)}
.legal{border-top:1px solid color-mix(in oklab,var(--band-fg) 15%,transparent);margin-top:50px;padding-top:24px;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:13px;color:var(--band-soft)}

/* Hareket */
.in{animation:up .9s cubic-bezier(.2,.7,.2,1) both}
.in.d2{animation-delay:.12s}.in.d3{animation-delay:.24s}.in.d4{animation-delay:.36s}
@keyframes up{from{transform:translateY(20px);opacity:.001}to{transform:none;opacity:1}}
@supports (animation-timeline: view()){
  .rv{animation:rv linear both;animation-timeline:view();animation-range:entry 0% entry 40%}
  @keyframes rv{from{opacity:.25;transform:translateY(36px)}to{opacity:1;transform:none}}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

@media (max-width:1080px){
  header.top{-webkit-backdrop-filter:none;backdrop-filter:none;background:var(--paper)}
  .burger{display:block}
  .nav-book{display:none}
  .lang{margin-left:auto}
  .menu-main{position:fixed;inset:72px 0 0 0;background:var(--paper);padding:24px max(20px,env(safe-area-inset-left,0px)) 40px;display:none;flex-direction:column;gap:24px;overflow:auto;border-top:1px solid var(--rule)}
  .admin-bar .menu-main{top:118px}
  .menu-main.open{display:flex}
  .menu-main ul{flex-direction:column;font-size:24px;gap:4px}
  .menu-main ul a{padding:12px 0;border-radius:0;border-bottom:1px solid var(--rule);color:var(--ink);font-weight:600;letter-spacing:-.02em}
  .menu-main ul a:hover,.menu-main ul a[aria-current]{background:none;color:var(--teal)}
  .menu-book{display:inline-flex;align-self:flex-start}
  .foot{grid-template-columns:1fr 1fr}
}
@media (max-width:600px){
  .nav{gap:12px;height:64px}
  .menu-main{inset:64px 0 0 0}
  .brand b{font-size:15px}
  .brand i{display:none}
  .brand .lg{width:38px;height:38px}
  .foot{grid-template-columns:1fr}
}
@media (max-width:782px){.admin-bar header.top{top:46px}}