/* furkantortcu.com v5 — v2-3d "Kesit" tasarım sistemi (kullanılmayan bölümler ayıklandı)
   Sistem: soğuk pafta kâğıdı + grafit mürekkep + tek vurgu (mühendis mavisi).
   Fontlar: Geologica (başlık + gövde) · Martian Mono (etiket, ölçü, sayı). Ayrıntı: DESIGN.md */

:root{
  --paper:#eef0ec;      /* pafta kâğıdı */
  --paper-2:#f6f7f4;    /* yükseltilmiş yüzey */
  --ink:#17191b;        /* grafit mürekkep */
  --muted:#5b6168;      /* soluk metin (≈5.5:1) */
  --line:#c7cbc4;       /* çizgi */
  --line-2:#dcdfd8;     /* ince çizgi */
  --blue:#2440d0;       /* mühendis mavisi (≈6.7:1) */
  --blue-ink:#ffffff;   /* mavi üstündeki metin */
  --blue-ters:#8ea0ff;  /* ters (koyu) zeminde mavi */
  --hatch:#8f958c;      /* kesit taraması */
  --nav-bg:rgba(238,240,236,.9);
  --sans:"Geologica","Segoe UI",system-ui,-apple-system,sans-serif;
  --mono:"Martian Mono",ui-monospace,"Cascadia Mono",Consolas,monospace;
  --maxw:1240px;
  --gut:clamp(16px,4vw,40px);
  --nav-h:68px;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#111315; --paper-2:#171a1d; --ink:#e4e6e1; --muted:#9aa0a6;
    --line:#30353a; --line-2:#22262a; --blue:#8ea0ff; --blue-ink:#0d1020; --blue-ters:#2440d0;
    --hatch:#5d646b; --nav-bg:rgba(17,19,21,.9); color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --paper:#111315; --paper-2:#171a1d; --ink:#e4e6e1; --muted:#9aa0a6;
  --line:#30353a; --line-2:#22262a; --blue:#8ea0ff; --blue-ink:#0d1020; --blue-ters:#2440d0;
  --hatch:#5d646b; --nav-bg:rgba(17,19,21,.9); color-scheme:dark;
}

/* ---------- taban ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{background:var(--paper);-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.6;font-weight:400;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-wrap:break-word}
img{display:block;max-width:100%;height:auto}
a{color:inherit}
button,input,select,textarea{font:inherit;color:inherit}
ul,ol{list-style:none}
h1,h2,h3,h4{font-weight:600;text-wrap:balance}
p{text-wrap:pretty}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
::selection{background:var(--blue);color:var(--blue-ink)}
[id]{scroll-margin-top:calc(var(--nav-h) + 16px)}
body.menu-acik{overflow:hidden}
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gut)}
.svg-tanim{position:absolute;width:0;height:0;overflow:hidden}
.atla{position:absolute;left:12px;top:-80px;z-index:100;background:var(--ink);color:var(--paper);padding:12px 18px;text-decoration:none;font-weight:500}
.atla:focus{top:12px}

/* ortak etiket (mono) */
.etiket{font-family:var(--mono);font-size:12px;font-weight:500;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-stretch:90%}

/* ---------- butonlar ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:12px 22px;border:1.5px solid var(--ink);
  border-radius:3px;font-size:16px;font-weight:500;line-height:1.25;text-decoration:none;cursor:pointer;
  transition:background-color .2s,color .2s,border-color .2s}
.btn svg{width:18px;height:18px;flex:none;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;transition:transform .25s}
.btn-ana{background:var(--ink);color:var(--paper)}
.btn-ana:hover{background:var(--blue);border-color:var(--blue);color:var(--blue-ink)}
.btn-cizgi{background:transparent;color:var(--ink)}
.btn-cizgi:hover{border-color:var(--blue);color:var(--blue)}
.btn:hover svg{transform:translateX(2px)}
.btn-ana[href="#nasil"]:hover svg{transform:translateY(2px)}
.ikon-btn{width:44px;height:44px;flex:none;display:grid;place-items:center;border:1px solid var(--line);border-radius:3px;background:transparent;cursor:pointer;transition:border-color .2s}
.ikon-btn:hover{border-color:var(--ink)}
.ikon-btn svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round}
.ikon-btn svg .dolu{fill:currentColor;stroke:none}
.metin-btn{display:inline-flex;align-items:center;min-height:44px;padding:0 2px;background:none;border:0;font-size:14px;color:var(--muted);
  text-decoration:underline;text-decoration-color:var(--line);text-underline-offset:4px;cursor:pointer}
.metin-btn:hover{color:var(--ink);text-decoration-color:var(--blue)}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:var(--nav-bg);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid transparent;transition:border-color .3s}
.nav.kaydi{border-bottom-color:var(--line)}
.nav{transition:border-color .3s,transform .3s ease}
.nav.gizli{transform:translateY(-100%)}
.nav-ic{display:flex;align-items:center;justify-content:space-between;gap:24px;height:var(--nav-h)}
.marka{display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:600;font-size:16px;letter-spacing:-.01em;min-height:44px}
.marka-im{position:relative;flex:none;width:34px;height:34px;display:grid;place-items:center;border:1.5px solid var(--ink);
  font-family:var(--mono);font-size:11.5px;font-weight:700;letter-spacing:.02em;padding-top:1px}
.marka-im::after{content:"";position:absolute;right:-5px;bottom:-5px;width:8px;height:8px;background:var(--blue)}
.nav-linkler{display:flex;align-items:center;gap:26px}
.nav-linkler a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:44px;text-decoration:none;font-size:15px;color:var(--muted);transition:color .2s}
.nav-linkler a:hover{color:var(--ink)}
.nav-linkler .nav-cta{color:var(--ink);border:1.5px solid var(--ink);border-radius:3px;padding:0 16px;font-weight:500}
.nav-linkler .nav-cta:hover{border-color:var(--blue);color:var(--blue)}
.nav-sag{display:flex;align-items:center;gap:8px}
.menu-btn{display:none;flex-direction:column;align-items:center;justify-content:center;gap:6px}
.menu-btn span{display:block;width:18px;height:1.6px;background:currentColor;transition:transform .3s}
.menu-btn[aria-expanded="true"] span:nth-child(1){transform:translateY(3.8px) rotate(45deg)}
.menu-btn[aria-expanded="true"] span:nth-child(2){transform:translateY(-3.8px) rotate(-45deg)}


/* ---------- giriş metni ---------- */
.giris{margin-top:28px;max-width:44ch;font-size:clamp(18px,1.45vw,21px);line-height:1.55;color:var(--muted)}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:36px}

/* ---------- kesit çizimi (hero + bölüm) ---------- */
.kesit-svg{display:block;width:100%;height:auto;overflow:visible}
.k-ciz{fill:none;stroke:var(--ink);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.k-ince{stroke:var(--muted);stroke-width:1}
.k-zemin{stroke-width:2.6}
.k-bant{stroke:var(--line);stroke-width:1}
.k-yz{stroke:var(--blue);stroke-width:1.4}
.t-cizgi{fill:none;stroke:var(--hatch);stroke-width:1}
.t-mavi{fill:var(--blue)}
.k-etiket{font-family:var(--mono);font-size:15px;font-weight:600;letter-spacing:.06em;fill:var(--ink);
  paint-order:stroke;stroke:var(--paper);stroke-width:7px;stroke-linejoin:round}
.k-etiket-yz{fill:var(--blue)}
.k-tabela{font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.24em;fill:var(--muted)}
.k-olcu .k-ciz{stroke:var(--blue);stroke-width:1.3}
.k-uzanti{fill:none;stroke:var(--blue);stroke-width:.8;stroke-dasharray:3 3}
.k-dalga{pointer-events:none}
.k-tarama{fill:var(--blue);opacity:0}
@media (prefers-reduced-motion:no-preference){
  .dalga{animation:dalga 5s cubic-bezier(.45,0,.55,1) 2.6s infinite}
  .k-tarama{opacity:1;animation:dalga 5s cubic-bezier(.45,0,.55,1) 2.6s infinite}
}
@keyframes dalga{0%{transform:translateX(0)}60%,100%{transform:translateX(800px)}}
.k-not{font-family:var(--sans);font-style:oblique 10deg;font-size:20px;font-weight:500;fill:var(--blue)}


/* ---------- bölüm başlığı (cetvel çizgisi) ---------- */
.bolum{padding:clamp(72px,9vw,136px) 0}
.bolum-bas{position:relative;display:grid;grid-template-columns:minmax(0,.62fr) minmax(0,1.38fr);gap:18px clamp(24px,4vw,56px);
  padding-top:24px;margin-bottom:clamp(40px,5vw,64px);border-top:1.5px solid var(--ink)}
.bolum-bas::before{content:"";position:absolute;left:0;right:0;top:0;height:7px;
  background:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 10px)}
.bolum-bas .etiket{grid-column:1;grid-row:1 / span 2;padding-top:12px}
.bolum-bas h2{grid-column:2;font-size:clamp(30px,4.2vw,58px);line-height:1.06;letter-spacing:-.03em}
.bolum-bas>p:not(.etiket){grid-column:2;max-width:60ch;font-size:clamp(17px,1.3vw,19px);color:var(--muted)}


/* ---------- örnek etiketi + 2B kesitte adım vurgusu ---------- */
.kesit-cizim .k-kat{transition:opacity .4s}
.kesit-cizim .secili .k-kat:not(.aktif){opacity:.3}
.kesit-cizim .k-kat.aktif .k-bant{stroke:var(--blue);stroke-width:2.2}
.kesit-cizim .k-kat.aktif .k-etiket{fill:var(--blue)}
.kesit-cizim .k-kat.aktif .k-ciz{stroke:var(--blue)}
.ornek-et{flex:none;display:inline-flex;align-items:center;gap:7px;font-family:var(--mono);font-size:11.5px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--blue);font-stretch:90%}
.ornek-et::before{content:"";width:7px;height:7px;background:var(--blue)}

/* ---------- süreç ---------- */
.surec-liste{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1.5px solid var(--ink)}
.surec-liste li{position:relative;padding:30px 22px 0 0}
.surec-liste li::before{content:"";position:absolute;top:-7px;left:0;width:12px;height:12px;border:1.5px solid var(--ink);border-radius:50%;background:var(--paper)}
.surec-liste li:first-child::before{background:var(--blue);border-color:var(--blue)}
/* zaman çizgisi canlanır (app.js .animasyonlu/.goster ekler): mavi çizgi soldan sağa ilerler, vardığı adımın noktası yanar,
   yazısı belirir; çizgi dolunca üstünde küçük bir ışık akar. JS yoksa ya da hareket azaltılmışsa hepsi baştan görünür. */
.surec-liste{position:relative;--surec-sure:2.4s}
.surec-liste li:nth-child(1){--i:0}.surec-liste li:nth-child(2){--i:1}.surec-liste li:nth-child(3){--i:2}.surec-liste li:nth-child(4){--i:3}
.surec-liste::after{content:"";position:absolute;left:0;right:0;top:-1.5px;height:3px;background:var(--blue);
  transform-origin:left;transform:scaleX(0);transition:transform var(--surec-sure) linear;pointer-events:none}
.surec-liste.goster::after{transform:none}
.surec-liste li::before{transition:background-color .35s,border-color .35s,box-shadow .35s;transition-delay:calc(var(--i) * var(--surec-sure) / 4)}
.surec-liste.goster li::before{background:var(--blue);border-color:var(--blue);box-shadow:0 0 0 5px color-mix(in oklch, var(--blue) 20%, transparent)}
.surec-liste.animasyonlu li>*{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease;
  transition-delay:calc(var(--i) * var(--surec-sure) / 4 + .15s)}
.surec-liste.goster li>*{opacity:1;transform:none}
.surec-liste.goster::before{content:"";position:absolute;top:-3px;left:-64px;width:64px;height:6px;border-radius:3px;pointer-events:none;opacity:0;
  background:linear-gradient(90deg,transparent,color-mix(in oklch, var(--blue) 35%, white),transparent);
  animation:surec-akis 3.2s linear calc(var(--surec-sure) + .4s) infinite}
@keyframes surec-akis{0%{left:-64px;opacity:0}12%{opacity:1}88%{opacity:1}100%{left:100%;opacity:0}}
@keyframes surec-akis-dikey{0%{top:-64px;opacity:0}12%{opacity:1}88%{opacity:1}100%{top:100%;opacity:0}}
@media (prefers-reduced-motion:reduce){
  .surec-liste::after,.surec-liste li::before,.surec-liste li>*{transition:none!important}
  .surec-liste.goster::before{display:none}
}
.s-no{font-family:var(--mono);font-size:12px;font-weight:600;color:var(--muted)}
.surec-liste h3{margin-top:8px;font-size:clamp(20px,1.8vw,24px);letter-spacing:-.02em;line-height:1.2}
.surec-liste p{margin-top:10px;font-size:15.5px;color:var(--muted)}


/* ---------- etiket listesi ---------- */
.etiketler{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px}
.etiketler li{font-family:var(--mono);font-size:11px;letter-spacing:.03em;padding:5px 9px;border:1px solid var(--line);border-radius:2px;color:var(--muted);font-stretch:90%}

/* ---------- hakkımda ---------- */
.hakkimda-grid{display:grid;grid-template-columns:minmax(0,.75fr) minmax(0,1.25fr);gap:clamp(32px,5vw,88px);align-items:start}
.portre{margin:0;border:1px solid var(--line);background:var(--paper-2);padding:12px}
.portre img{width:100%;aspect-ratio:720/958;object-fit:cover;mix-blend-mode:multiply}
:root[data-theme="dark"] .portre img{mix-blend-mode:normal}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .portre img{mix-blend-mode:normal}}
.portre figcaption{display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px 12px;padding:12px 2px 2px;font-family:var(--mono);font-size:11.5px;letter-spacing:.04em;color:var(--muted);font-stretch:90%}
.portre figcaption span:first-child{color:var(--ink);font-weight:600}
.hakkimda-giris{font-size:clamp(21px,2vw,27px);line-height:1.4;letter-spacing:-.015em;font-weight:500}
.hakkimda-metin>p+p{margin-top:18px;color:var(--muted);max-width:60ch}
.kunye{margin-top:32px;border-top:1px solid var(--line)}
.kunye>div{display:grid;grid-template-columns:128px minmax(0,1fr);gap:4px 16px;padding:14px 0;border-bottom:1px solid var(--line-2)}
.kunye dt{font-family:var(--mono);font-size:11.5px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);padding-top:4px;font-stretch:90%}
.kunye .etiketler{margin-top:0}

/* ---------- iletişim (ters zemin) ---------- */
.iletisim{background:var(--ink);color:var(--paper);--blue:var(--blue-ters);--line:color-mix(in oklch, var(--paper) 22%, transparent);--muted:color-mix(in oklch, var(--paper) 72%, var(--ink))}
.iletisim ::selection{background:var(--paper);color:var(--ink)}
.iletisim :focus-visible{outline-color:var(--blue)}
.iletisim-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:clamp(36px,5vw,88px);align-items:start}
.iletisim h2{margin-top:18px;font-size:clamp(32px,4.4vw,60px);line-height:1.06;letter-spacing:-.03em}
.iletisim-metin>p:not(.etiket){margin-top:22px;max-width:48ch;font-size:18px;color:var(--muted)}
.eposta{display:inline-flex;align-items:center;gap:12px;min-height:48px;margin-top:30px;font-size:clamp(19px,2vw,26px);font-weight:500;
  text-decoration:underline;text-decoration-color:var(--blue);text-decoration-thickness:2px;text-underline-offset:7px;word-break:break-all}
.eposta svg{width:22px;height:22px;flex:none;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.eposta:hover{color:var(--blue)}
.form{display:grid;gap:18px}
.alan label{display:block;margin-bottom:8px;font-family:var(--mono);font-size:11.5px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);font-stretch:90%}
.opsiyonel{text-transform:none;letter-spacing:0;font-weight:400}
.alan input,.alan select,.alan textarea{width:100%;min-height:48px;padding:12px 14px;border:1px solid var(--line);border-radius:3px;background:transparent;color:var(--paper);font-size:16px}
.alan select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,currentColor 50%),linear-gradient(135deg,currentColor 50%,transparent 50%);
  background-position:calc(100% - 20px) 21px,calc(100% - 15px) 21px;background-size:5px 5px;background-repeat:no-repeat;padding-right:40px}
.alan select option{color:#17191b;background:#f6f7f4}
.alan textarea{resize:vertical;line-height:1.5}
.alan input::placeholder,.alan textarea::placeholder{color:color-mix(in oklch, var(--paper) 45%, transparent)}
.alan input:focus,.alan select:focus,.alan textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px color-mix(in oklch, var(--blue) 35%, transparent)}
.alan [aria-invalid="true"]{border-color:var(--paper);border-width:2px}
.hata{margin-top:8px;font-size:14px;font-weight:500}
.hata::before{content:"! ";color:var(--blue);font-weight:700}
.iletisim .btn-ana{background:var(--paper);color:var(--ink);border-color:var(--paper)}
.iletisim .btn-ana:hover{background:var(--blue);border-color:var(--blue);color:var(--ink)}
.btn-gonder{justify-self:start}
.form-not{font-size:14px;color:var(--muted)}

/* ---------- altbilgi ---------- */
.altbilgi{padding:22px 0 26px;border-top:1px solid var(--line)}
.altbilgi-ic{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px}
.ab-sol{font-size:14px;color:var(--muted)}
.ab-ayrac{color:var(--line);margin:0 4px}
.ab-sag{display:flex;flex-wrap:wrap;gap:4px 20px}

/* ---------- makine görünümü ---------- */
.makine{width:min(880px,calc(100% - 32px));max-height:min(86vh,920px);margin:auto;padding:0;border:1.5px solid var(--ink);background:var(--paper-2);color:var(--ink)}
.makine::backdrop{background:rgb(10 12 14 / .55)}
.makine[open]{display:flex;flex-direction:column}
.makine-bas{display:flex;justify-content:space-between;gap:20px;padding:22px 24px 16px;border-bottom:1px solid var(--line)}
.makine-bas h2{margin-top:8px;font-size:clamp(20px,2.4vw,26px);letter-spacing:-.02em}
.makine-bas p:not(.etiket){margin-top:6px;font-size:14.5px;color:var(--muted)}
.makine pre{flex:1;overflow:auto;padding:20px 24px;font-family:var(--mono);font-size:12.5px;line-height:1.7;white-space:pre-wrap;word-break:break-word;font-stretch:90%}
.makine-alt{display:flex;flex-wrap:wrap;align-items:center;gap:12px 18px;padding:14px 24px 18px;border-top:1px solid var(--line)}


/* ---------- kaydırınca beliren öğeler (destek varsa) ---------- */
@supports (animation-timeline:view()){
  @media (prefers-reduced-motion:no-preference){
    .bolum-bas,.hakkimda-grid,.iletisim-grid{
      animation:beliren linear both;animation-timeline:view();animation-range:entry 0% entry 35%}
  }
}
@keyframes beliren{from{opacity:0;transform:translateY(22px)}to{opacity:1;transform:none}}

/* ---------- duyarlılık ---------- */
@media (max-width:1080px){
  .nav-linkler{gap:18px}
  .surec-liste{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:36px}
}
@media (max-width:900px){
  :root{--nav-h:62px}
  .menu-btn{display:flex}
  .nav-linkler{position:absolute;top:var(--nav-h);left:0;right:0;height:calc(100dvh - var(--nav-h));overflow-y:auto;flex-direction:column;align-items:stretch;gap:0;
    padding:8px var(--gut) 28px;background:var(--paper);border-top:1px solid var(--line);display:none}
  .nav.acik .nav-linkler{display:flex}
  .nav-linkler a{display:flex;min-height:56px;font-size:21px;font-weight:500;letter-spacing:-.01em;color:var(--ink);border-bottom:1px solid var(--line-2)}
  .nav-linkler .nav-cta-li{margin-top:14px}
  .nav-linkler .nav-cta{justify-content:center;border-bottom:1.5px solid var(--ink)}

  .bolum-bas{grid-template-columns:1fr}
  .bolum-bas .etiket,.bolum-bas h2,.bolum-bas>p:not(.etiket){grid-column:1;grid-row:auto}
  .bolum-bas .etiket{padding-top:0}
  .hakkimda-grid,.iletisim-grid{grid-template-columns:1fr}
  .portre{max-width:420px}
}
@media (max-width:600px){
  body{font-size:16.5px}
  .cta .btn{width:100%}
  .k-etiket{font-size:19px;stroke-width:8px}
  .k-tabela{display:none}
  .surec-liste{grid-template-columns:1fr;border-top:0;border-left:1.5px solid var(--ink);margin-left:6px;row-gap:0}
  .surec-liste li{padding:0 0 30px 26px}
  .surec-liste li::before{top:4px;left:-7px}
  /* telefonda zaman çizgisi dikey: çizgi yukarıdan aşağı ilerler, ışık aşağı akar */
  .surec-liste::after{left:-1.5px;right:auto;top:0;bottom:0;width:3px;height:auto;transform-origin:top;transform:scaleY(0)}
  .surec-liste.goster::before{top:-64px;left:-3px;width:6px;height:64px;
    background:linear-gradient(180deg,transparent,color-mix(in oklch, var(--blue) 35%, white),transparent);animation-name:surec-akis-dikey}
  .kunye>div{grid-template-columns:1fr}
  .btn-gonder{justify-self:stretch}
}