/* ===========================================================
   SFK Insights — Mühendislik Danışmanlığı
   Tasarım sistemi · lacivert + gri · mühendislik-editöryel
   =========================================================== */

:root{
  --navy:#15294B;
  --navy-deep:#0E1E38;
  --navy-700:#233961;
  --paper:#F4F1E9;
  --paper-2:#EEEADF;
  --card:#FCFBF7;
  --ink:#15294B;
  --text:#343D4C;
  --muted:#6F7681;
  --muted-2:#8B919B;
  --line:rgba(21,41,75,0.14);
  --line-2:rgba(21,41,75,0.28);
  --line-light:rgba(244,241,233,0.16);
  --radius:6px;
  --serif:'IBM Plex Serif',Georgia,'Times New Roman',serif;
  --sans:'IBM Plex Sans',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,'SFMono-Regular',monospace;
  --container:1200px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--paper);
  color:var(--text);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.72;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}

.container{max-width:var(--container);margin:0 auto;padding-inline:clamp(1.25rem,5vw,3.25rem)}
.section{padding-block:clamp(4.5rem,10vw,8.5rem)}
.section--tight{padding-block:clamp(3.5rem,7vw,5.5rem)}
.divider{height:1px;background:var(--line);border:0}

h1,h2,h3,h4{font-family:var(--serif);color:var(--ink);font-weight:500;line-height:1.12}
.display{font-size:clamp(2.7rem,6vw,4.7rem);line-height:1.04;letter-spacing:-0.018em;font-weight:500}
.h2{font-size:clamp(2rem,4vw,3rem);letter-spacing:-0.012em}
.h3{font-size:clamp(1.3rem,2vw,1.6rem)}
.lead{font-size:clamp(1.12rem,1.7vw,1.36rem);line-height:1.62;color:var(--text)}
p{max-width:64ch}
strong{font-weight:600;color:var(--ink)}

.eyebrow{font-family:var(--mono);font-size:.74rem;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);display:flex;align-items:center;gap:.7rem;font-weight:500}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--line-2);display:inline-block}
.eyebrow--center{justify-content:center}

.site-header{position:sticky;top:0;z-index:50;background:rgba(244,241,233,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center}
.brand svg,.brand img{height:34px;width:auto}
.nav-links{display:flex;align-items:center;gap:2.1rem}
.nav-links a{font-size:.83rem;font-weight:500;letter-spacing:.02em;color:var(--muted);position:relative;padding-block:.4rem;transition:color .25s var(--ease)}
.nav-links a:hover{color:var(--ink)}
.nav-links a.active{color:var(--ink)}
.nav-links a.active::after{content:"";position:absolute;left:0;bottom:-1px;width:100%;height:2px;background:var(--navy)}
.nav-cta{font-family:var(--sans);border:1px solid var(--line-2);padding:.6rem 1.15rem;border-radius:2px;color:var(--ink)!important;font-size:.8rem;transition:background .25s var(--ease),color .25s var(--ease)}
.nav-cta:hover{background:var(--navy);color:var(--paper)!important}
.nav-cta::after{display:none}
.menu-btn{display:none;background:none;border:0;cursor:pointer;color:var(--ink);padding:.4rem}
.menu-btn svg{width:24px;height:24px}

.btn{display:inline-flex;align-items:center;gap:.6rem;font-family:var(--sans);font-size:.86rem;font-weight:500;letter-spacing:.02em;padding:.95rem 1.6rem;border-radius:2px;cursor:pointer;transition:transform .2s var(--ease),background .25s var(--ease),color .25s var(--ease);border:1px solid var(--navy)}
.btn .arrow{transition:transform .25s var(--ease)}
.btn:hover .arrow{transform:translateX(4px)}
.btn--primary{background:var(--navy);color:var(--paper)}
.btn--primary:hover{background:var(--navy-deep)}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line-2)}
.btn--ghost:hover{background:var(--navy);color:var(--paper);border-color:var(--navy)}
.btn--light{background:var(--paper);color:var(--navy);border-color:var(--paper)}
.btn--light:hover{background:transparent;color:var(--paper);border-color:var(--line-light)}
.btn-row{display:flex;flex-wrap:wrap;gap:.9rem}

.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:62px 62px;-webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.55),transparent 78%);mask-image:linear-gradient(180deg,rgba(0,0,0,.55),transparent 78%);opacity:.55;pointer-events:none}
.hero-inner{position:relative;padding-block:clamp(4.5rem,11vw,8.5rem);display:grid;grid-template-columns:1.35fr .65fr;gap:3rem;align-items:center}
.hero h1{margin:1.5rem 0 1.6rem;max-width:15ch}
.hero .lead{max-width:46ch;color:var(--muted);margin-bottom:2.4rem}
.hero-figure{position:relative;display:flex;justify-content:center;align-items:center}
.hero-figure img{width:100%;height:clamp(300px,40vw,470px);object-fit:cover;border-radius:var(--radius)}

.sec-head{display:grid;grid-template-columns:1fr 1fr;gap:2.5rem;align-items:end;margin-bottom:3.4rem}
.sec-head .h2{margin-top:1.1rem}
.sec-head p{color:var(--muted);max-width:44ch}
@media(max-width:760px){.sec-head{grid-template-columns:1fr;gap:1rem}}

.about-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:clamp(2rem,6vw,5rem);align-items:start}
.about-grid .stack > * + *{margin-top:1.4rem}
.about-aside{border-left:1px solid var(--line-2);padding-left:1.8rem}
.about-aside .q{font-family:var(--serif);font-size:1.45rem;line-height:1.45;color:var(--navy)}
.about-aside .who{font-family:var(--mono);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-top:1.4rem}

.svc-list{border-top:1px solid var(--line)}
.svc{display:grid;grid-template-columns:auto 1fr auto;gap:2rem;align-items:baseline;padding:2.3rem 0;border-bottom:1px solid var(--line);transition:background .3s var(--ease)}
.svc:hover{background:var(--paper-2)}
.svc .idx{font-family:var(--mono);font-size:.85rem;color:var(--muted-2);padding-top:.3rem}
.svc .body{max-width:60ch}
.svc h3{margin-bottom:.5rem}
.svc p{color:var(--muted);font-size:.97rem;max-width:58ch}
.svc .go{font-family:var(--mono);font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;color:var(--navy);display:flex;align-items:center;gap:.5rem;white-space:nowrap}
.svc .go .arrow{transition:transform .25s var(--ease)}
.svc:hover .go .arrow{transform:translateX(4px)}
@media(max-width:680px){.svc{grid-template-columns:auto 1fr;gap:1rem 1.1rem}.svc .go{grid-column:2;margin-top:.4rem}}

.band{background:var(--navy);color:var(--paper)}
.band .eyebrow{color:#9AA7BE}
.band .eyebrow::before{background:var(--line-light)}
.band-quote{font-family:var(--serif);font-weight:500;font-size:clamp(1.7rem,3.6vw,2.9rem);line-height:1.3;letter-spacing:-0.01em;max-width:20ch;margin-top:1.6rem}
.band-quote em{font-style:italic;color:#AEB9CC}

.svc-detail{display:grid;grid-template-columns:.42fr 1fr;gap:clamp(1.5rem,5vw,4rem);padding-block:clamp(3rem,6vw,5rem);border-bottom:1px solid var(--line)}
.svc-detail:last-child{border-bottom:0}
.svc-detail .marker .idx{font-family:var(--mono);font-size:.8rem;color:var(--muted-2)}
.svc-detail .marker h2{font-size:clamp(1.7rem,2.6vw,2.3rem);margin-top:.8rem}
.svc-detail .content p + p{margin-top:1.15rem}
.svc-detail .content p{color:var(--muted);max-width:62ch}
@media(max-width:760px){.svc-detail{grid-template-columns:1fr;gap:1.4rem}}

.cert-list{margin-top:1.7rem;border-top:1px solid var(--line)}
.cert{display:grid;grid-template-columns:auto 1fr;gap:1.1rem;align-items:baseline;padding:.95rem 0;border-bottom:1px solid var(--line)}
.cert .code{font-family:var(--mono);font-weight:500;color:var(--navy);font-size:.92rem;white-space:nowrap}
.cert .desc{color:var(--muted);font-size:.95rem}

.page-head{border-bottom:1px solid var(--line);position:relative}
.page-head .container{padding-block:clamp(3.4rem,7vw,5.6rem)}
.page-head h1{font-size:clamp(2.4rem,5vw,3.7rem);letter-spacing:-0.015em;margin-top:1.2rem;max-width:18ch}
.page-head p{color:var(--muted);margin-top:1.3rem;max-width:54ch}

.post-list{border-top:1px solid var(--line)}
.post-card{display:grid;grid-template-columns:auto 1fr auto;gap:2rem;align-items:center;padding:2.4rem 0;border-bottom:1px solid var(--line);transition:background .3s var(--ease)}
.post-card:hover{background:var(--paper-2)}
.post-card .date{font-family:var(--mono);font-size:.74rem;letter-spacing:.1em;color:var(--muted-2);text-transform:uppercase}
.post-card h3{font-size:clamp(1.3rem,2.2vw,1.75rem);margin-bottom:.45rem}
.post-card p{color:var(--muted);font-size:.97rem;max-width:62ch}
.post-card .go .arrow{transition:transform .25s var(--ease)}
.post-card:hover .go .arrow{transform:translateX(5px)}
.post-card .go{color:var(--navy)}
@media(max-width:680px){.post-card{grid-template-columns:1fr;gap:.7rem}.post-card .go{justify-self:start}}

.article{max-width:720px;margin:0 auto}
.article .meta{font-family:var(--mono);font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted-2);display:flex;gap:1rem;flex-wrap:wrap}
.article h1{font-size:clamp(2rem,4.4vw,3.1rem);line-height:1.14;letter-spacing:-0.015em;margin:1.3rem 0 0}
.article .body{margin-top:2.4rem}
.article .body p{font-size:1.12rem;line-height:1.78;color:var(--text);max-width:none}
.article .body p + p{margin-top:1.5rem}
.article .body .drop::first-letter{font-family:var(--serif);font-size:3.6rem;line-height:.8;float:left;padding:.18rem .55rem .1rem 0;color:var(--navy);font-weight:500}

.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(2rem,6vw,5rem);align-items:start}
@media(max-width:820px){.contact-grid{grid-template-columns:1fr;gap:2.5rem}}
.contact-info .row{padding:1.3rem 0;border-bottom:1px solid var(--line)}
.contact-info .row:first-child{border-top:1px solid var(--line)}
.contact-info .k{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted-2)}
.contact-info .v{font-family:var(--serif);font-size:1.3rem;color:var(--navy);margin-top:.35rem}
.contact-info .v a:hover{text-decoration:underline}

.form{display:grid;gap:1.35rem}
.field{display:grid;gap:.5rem}
.field label{font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.field input,.field textarea{font-family:var(--sans);font-size:1rem;color:var(--ink);background:var(--card);border:1px solid var(--line-2);border-radius:2px;padding:.85rem .95rem;width:100%;transition:border-color .2s var(--ease),box-shadow .2s var(--ease)}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--navy);box-shadow:0 0 0 3px rgba(21,41,75,.08)}
.field textarea{resize:vertical;min-height:130px}
.hp{position:absolute;left:-9999px}
.form .btn{justify-content:center;margin-top:.4rem}

.cta{background:var(--navy);color:var(--paper);text-align:center}
.cta h2{color:var(--paper);font-size:clamp(2rem,4.2vw,3.1rem);max-width:18ch;margin:1.3rem auto 1.8rem}
.cta .eyebrow{color:#9AA7BE;justify-content:center}
.cta .eyebrow::before{background:var(--line-light)}

.site-footer{background:var(--navy-deep);color:#AEB4BE}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2.5rem;padding-block:clamp(3rem,6vw,4.6rem);border-bottom:1px solid var(--line-light)}
.footer-top .brand svg,.footer-top .brand img{height:30px}
.footer-top .blurb{margin-top:1.3rem;font-size:.95rem;color:#8C93A0;max-width:34ch}
.footer-col h4{font-family:var(--mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:#7E8694;font-weight:500;margin-bottom:1.1rem}
.footer-col a,.footer-col .ln{display:block;color:#AEB4BE;font-size:.95rem;padding:.32rem 0;transition:color .2s var(--ease)}
.footer-col a:hover{color:var(--paper)}
.footer-bottom{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;padding-block:1.7rem;font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;color:#6E7686}
@media(max-width:760px){.footer-top{grid-template-columns:1fr;gap:2rem}}

.reveal{opacity:0;transform:translateY(22px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}
.reveal.d2{transition-delay:.16s}
.reveal.d3{transition-delay:.24s}
.reveal.d4{transition-delay:.32s}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

@media(max-width:860px){
  .menu-btn{display:block}
  .nav-links{position:fixed;inset:74px 0 auto 0;flex-direction:column;align-items:flex-start;gap:0;background:var(--paper);border-bottom:1px solid var(--line);padding:1rem clamp(1.25rem,5vw,3.25rem) 1.8rem;transform:translateY(-12px);opacity:0;pointer-events:none;transition:opacity .25s var(--ease),transform .25s var(--ease)}
  .nav-links.open{transform:none;opacity:1;pointer-events:auto}
  .nav-links a{width:100%;padding:.95rem 0;border-bottom:1px solid var(--line);font-size:1rem}
  .nav-links a.active::after{display:none}
  .nav-cta{margin-top:1rem;border:1px solid var(--navy);width:100%;text-align:center}
}
@media(max-width:900px){
  .hero-inner{grid-template-columns:1fr;gap:2.5rem}
  .hero-figure{order:-1;justify-content:flex-start}
  .hero-figure img{height:250px}
  .about-grid{grid-template-columns:1fr;gap:2.4rem}
  .about-aside{border-left:0;border-top:1px solid var(--line-2);padding-left:0;padding-top:1.6rem}
}
@media(max-width:620px){
  body{font-size:16px}
}

/* Article hero */
.article-hero{background:var(--navy);color:var(--paper);overflow:hidden}
.article-hero .container{padding-block:clamp(3rem,6.5vw,5rem)}
.ah-grid{display:grid;grid-template-columns:1fr auto;gap:clamp(1.5rem,4vw,3.5rem);align-items:center}
.ah-back{font-family:var(--mono);font-size:.73rem;letter-spacing:.14em;text-transform:uppercase;color:#9AA7BE;display:inline-flex;gap:.5rem;transition:color .2s var(--ease)}
.ah-back:hover{color:var(--paper)}
.ah-meta{font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:#9AA7BE;display:flex;gap:1.1rem;flex-wrap:wrap;margin:1.7rem 0 .9rem}
.article-hero h1{color:var(--paper);font-size:clamp(1.9rem,4vw,3rem);line-height:1.16;letter-spacing:-0.015em;max-width:19ch}
.ah-motif{width:clamp(116px,15vw,158px);height:clamp(116px,15vw,158px);flex:none;display:block}
@media(max-width:720px){.ah-grid{grid-template-columns:1fr}.ah-motif{display:none}}

/* Blog yazısı fotoğrafı */
.post-photo{margin:0;border-bottom:1px solid var(--line)}
.post-photo img{display:block;width:100%;height:clamp(240px,40vw,470px);object-fit:cover}

/* Blog kartı görseli */
.post-card .thumb{width:126px;height:92px;flex:none;border:1px solid var(--line);background:var(--card);display:flex;align-items:center;justify-content:center;color:var(--navy)}
.post-card .thumb .ticon{width:62px;height:62px;display:block}
.post-card .date{display:block;margin-bottom:.5rem}
@media(max-width:680px){.post-card .thumb{width:100%;height:124px}}

/* Ilgili icerik */
.related{border-top:1px solid var(--line);background:var(--paper-2)}
.related .container{padding-block:clamp(3rem,6vw,4.6rem)}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem;margin-top:1.8rem}
.related-card{display:flex;flex-direction:column;gap:.55rem;padding:1.5rem;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);transition:border-color .25s var(--ease),transform .25s var(--ease)}
.related-card:hover{border-color:var(--line-2);transform:translateY(-3px)}
.related-card--svc{background:var(--navy);border-color:var(--navy)}
.related-card .rc-kind{font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted-2)}
.related-card--svc .rc-kind{color:#9AA7BE}
.related-card .rc-title{font-family:var(--serif);font-size:1.1rem;line-height:1.3;color:var(--ink);flex:1}
.related-card--svc .rc-title{color:var(--paper)}
.related-card .rc-go{font-family:var(--mono);font-size:.71rem;letter-spacing:.1em;text-transform:uppercase;color:var(--navy)}
.related-card--svc .rc-go{color:#AEB9CC}
@media(max-width:760px){.related-grid{grid-template-columns:1fr}}

/* WhatsApp butonu */
.wa-fab{position:fixed;right:clamp(1rem,3vw,2rem);bottom:clamp(1rem,3vw,2rem);z-index:60;width:58px;height:58px;border-radius:50%;background:#25D366;color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 20px rgba(0,0,0,.28);transition:transform .2s var(--ease),box-shadow .2s var(--ease)}
.wa-fab:hover{transform:scale(1.07);box-shadow:0 8px 26px rgba(0,0,0,.34)}
.wa-fab svg{width:32px;height:32px;display:block}
@media(max-width:620px){.wa-fab{width:52px;height:52px}.wa-fab svg{width:28px;height:28px}}