/* ===========================================================
   Gönenç Türkekul — Personal site
   Design system: "Editorial Systems" (Swiss grid + Fraunces serif)
   =========================================================== */

:root{
  --bg:#FFFFFF;
  --ink:#0A0A0A;
  --muted:#666666;
  --faint:#8A8A8A;
  --hair:#DcDcDc;
  --rule:#0A0A0A;
  --accent:#FF4D00;
  --accent-ink:#FFFFFF;
  --maxw:1200px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:hidden}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  -webkit-font-smoothing:antialiased;
  line-height:1.5;
}
.serif{font-family:"Fraunces",Georgia,"Times New Roman",serif}
.mono{font-family:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,monospace}
a{color:inherit}
img{max-width:100%;display:block}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 40px}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:var(--bg);border-bottom:2px solid var(--rule)}
.site-header .bar{display:flex;justify-content:space-between;align-items:center;padding-top:20px;padding-bottom:20px}
.brand{font-family:"Fraunces",serif;font-weight:600;font-size:21px;letter-spacing:-.01em;text-decoration:none;color:var(--ink)}
.nav{display:flex;font-size:12px;letter-spacing:.05em;text-transform:uppercase}
.nav a{color:var(--ink);text-decoration:none;padding:6px 15px;border-left:1px solid var(--hair);transition:color .15s}
.nav a:first-child{padding-left:0;border-left:0}
.nav a:hover{color:var(--accent)}
.nav a.active{color:var(--accent)}
/* Mobile menu button (hidden on desktop) */
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;
  width:42px;height:42px;padding:0;margin-left:auto;cursor:pointer;
  background:var(--bg);border:1px solid var(--ink)}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--ink);margin:0 auto;
  transition:transform .25s ease,opacity .2s ease}
.nav-overlay{display:none}

.meta-bar{border-bottom:1px solid var(--hair)}
.meta-bar .row{display:flex;justify-content:space-between;gap:16px;padding-top:10px;padding-bottom:10px;font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.meta-bar .row span:nth-child(2){color:var(--ink)}

/* ---------- Generic page header ---------- */
.page-head{padding:64px 0 40px;border-bottom:2px solid var(--rule)}
.eyebrow{font-size:12px;letter-spacing:.12em;color:var(--accent);text-transform:uppercase;margin-bottom:18px}
.page-head h1{font-family:"Fraunces",serif;font-weight:500;font-size:64px;line-height:1;letter-spacing:-.025em}
.page-head .intro{font-size:18px;color:#2a2a2a;line-height:1.6;max-width:680px;margin-top:22px}

/* ---------- Home hero ---------- */
.hero{display:grid;grid-template-columns:1fr 360px;gap:48px;padding:72px 0 60px;border-bottom:2px solid var(--rule)}
.hero .ov{font-size:12px;letter-spacing:.1em;color:var(--accent);text-transform:uppercase;margin-bottom:24px}
.hero h1{font-family:"Fraunces",serif;font-weight:500;font-size:96px;line-height:.92;letter-spacing:-.025em}
.hero .role{font-size:25px;letter-spacing:-.005em;margin-top:20px;font-weight:500;color:#1a1a1a}
.hero .role b{color:var(--accent);font-weight:600}
.hero aside{align-self:end}
.hero aside p{font-size:15.5px;color:#222;line-height:1.65;margin-bottom:24px}

/* ---------- Buttons ---------- */
.btn{display:inline-block;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink);
  text-decoration:none;border:1px solid var(--ink);padding:11px 18px;margin:0 6px 8px 0;font-weight:500;transition:.15s}
.btn:hover{background:var(--ink);color:#fff}
.btn.fill{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn.fill:hover{background:#e64500;border-color:#e64500}

/* ---------- Section heads ---------- */
.sec-head{display:flex;justify-content:space-between;align-items:baseline;padding:48px 0 6px;flex-wrap:wrap;gap:8px}
.sec-head h2{font-size:13px;letter-spacing:.1em;text-transform:uppercase}
.sec-head span{font-size:11.5px;color:var(--muted)}

/* ---------- Case study index rows ---------- */
.index{padding-bottom:24px}
.row{display:grid;grid-template-columns:54px 1fr 240px 170px;align-items:center;gap:20px;
  padding:24px 0;border-top:1px solid var(--hair);text-decoration:none;color:inherit;transition:background .15s}
.row:last-child{border-bottom:1px solid var(--hair)}
.row:hover{background:#FAFAFA}
.row:hover .title{color:var(--accent)}
.row .num{font-weight:500;font-size:15px;color:var(--accent)}
.row .title{font-family:"Fraunces",serif;font-weight:500;font-size:23px;letter-spacing:-.01em;transition:color .15s}
.row .desc{font-size:13px;color:var(--muted);line-height:1.5}
.row .stat{text-align:right;font-size:12.5px;color:var(--ink)}

/* ---------- Metrics strip ---------- */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--hair);
  border:1px solid var(--hair);margin:0 0 8px}
.metrics .m{background:var(--bg);padding:26px 24px}
.metrics .n{font-family:"Fraunces",serif;font-size:38px;font-weight:500;letter-spacing:-.02em}
.metrics .l{font-size:12px;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);margin-top:8px}

/* ---------- Expertise / skill groups ---------- */
.groups{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--hair);border:1px solid var(--hair)}
.group{background:var(--bg);padding:32px 30px 36px}
.group h3{font-family:"Fraunces",serif;font-weight:500;font-size:24px;margin-bottom:6px}
.group .k{font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:16px}
.tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{font-size:13px;color:#222;border:1px solid var(--hair);padding:6px 11px;border-radius:2px}

/* ---------- Long-form case study blocks ---------- */
.case{padding:56px 0;border-bottom:1px solid var(--hair)}
.case .cnum{font-family:"JetBrains Mono",monospace;font-size:14px;color:var(--accent)}
.case h2{font-family:"Fraunces",serif;font-weight:500;font-size:38px;letter-spacing:-.02em;margin:8px 0 6px}
.case .purpose{font-size:16px;color:var(--muted);max-width:760px;line-height:1.6;margin-bottom:28px}
.transform{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--hair);border:1px solid var(--hair);margin-bottom:24px}
.transform .cell{background:var(--bg);padding:22px 22px}
.transform .cell .h{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--faint);margin-bottom:10px}
.transform .cell.old .h{color:var(--muted)}
.transform .cell.new .h{color:var(--accent)}
.transform .cell p{font-size:14.5px;line-height:1.6;color:#222}
.impact-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.impact-grid h4{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink);margin-bottom:12px}
.impact-grid ul{list-style:none}
.impact-grid li{font-size:14.5px;color:#222;line-height:1.5;padding:7px 0 7px 18px;position:relative;border-bottom:1px solid #F0F0F0}
.impact-grid li::before{content:"—";position:absolute;left:0;color:var(--accent)}

/* ---------- Timeline (about) ---------- */
.timeline{border-top:1px solid var(--hair)}
.tl-row{display:grid;grid-template-columns:200px 1fr;gap:32px;padding:28px 0;border-bottom:1px solid var(--hair)}
.tl-row .when{font-family:"JetBrains Mono",monospace;font-size:13px;color:var(--accent)}
.tl-row h3{font-family:"Fraunces",serif;font-weight:500;font-size:22px;margin-bottom:8px}
.tl-row p{font-size:15px;color:#333;line-height:1.6;max-width:640px}

/* ---------- Prose ---------- */
.prose{max-width:680px;padding:48px 0}
.prose p{font-size:17px;line-height:1.7;color:#222;margin-bottom:22px}
.prose p:first-child{font-size:20px;color:var(--ink)}

/* ---------- Writing list ---------- */
.posts{padding-bottom:24px}
.post{display:grid;grid-template-columns:130px 1fr 150px;gap:24px;align-items:baseline;
  padding:24px 0;border-top:1px solid var(--hair);text-decoration:none;color:inherit}
.post:last-child{border-bottom:1px solid var(--hair)}
.post:hover .pt{color:var(--accent)}
.post .cat{font-family:"JetBrains Mono",monospace;font-size:11.5px;text-transform:uppercase;color:var(--muted)}
.post .pt{font-family:"Fraunces",serif;font-size:22px;font-weight:500;letter-spacing:-.01em;transition:color .15s}
.post .status{text-align:right;font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--faint)}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;padding:48px 0}
.contact-grid .lead{font-family:"Fraunces",serif;font-size:30px;font-weight:500;line-height:1.25;letter-spacing:-.01em}
.contact-list{list-style:none}
.contact-list li{border-top:1px solid var(--hair);padding:18px 0}
.contact-list li:last-child{border-bottom:1px solid var(--hair)}
.contact-list .k{font-family:"JetBrains Mono",monospace;font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:5px}
.contact-list a{font-size:18px;color:var(--ink);text-decoration:none}
.contact-list a:hover{color:var(--accent)}

/* ---------- Footer ---------- */
.site-footer{border-top:2px solid var(--rule);margin-top:24px}
.site-footer .top{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;padding:44px 0 32px;flex-wrap:wrap}
.site-footer .fbrand{font-family:"Fraunces",serif;font-size:24px;font-weight:500}
.site-footer .ftag{font-size:14px;color:var(--muted);margin-top:8px;max-width:380px;line-height:1.5}
.site-footer nav{display:flex;flex-wrap:wrap;gap:18px;font-size:13px}
.site-footer nav a{color:var(--muted);text-decoration:none}
.site-footer nav a:hover{color:var(--ink)}
.site-footer .bottom{display:flex;justify-content:space-between;gap:16px;padding:16px 0 40px;border-top:1px solid var(--hair);
  font-family:"JetBrains Mono",monospace;font-size:11.5px;color:var(--faint);flex-wrap:wrap}

/* ---------- Responsive ---------- */
@media(max-width:900px){
  .wrap{padding:0 22px}
  .hero{grid-template-columns:1fr;gap:32px;padding:48px 0 40px}
  .hero h1{font-size:60px}
  .hero aside{align-self:start}
  .page-head h1{font-size:44px}
  .metrics{grid-template-columns:1fr 1fr}
  .groups,.transform,.impact-grid,.contact-grid{grid-template-columns:1fr}
  .row{grid-template-columns:36px 1fr;gap:6px 14px}
  .row .desc{grid-column:2}
  .row .stat{grid-column:2;text-align:left;color:var(--muted)}
  .tl-row{grid-template-columns:1fr;gap:8px}
  .post{grid-template-columns:1fr;gap:6px}
  .post .status{text-align:left}
  .meta-bar{display:none}
}
@media(max-width:640px){
  .hero h1{font-size:46px}

  /* show hamburger */
  .nav-toggle{display:flex}

  /* nav becomes a slide-in drawer */
  .nav{
    position:fixed;top:0;right:0;z-index:60;
    height:100vh;width:80%;max-width:300px;
    flex-direction:column;align-items:stretch;
    background:var(--bg);border-left:2px solid var(--ink);
    padding:84px 28px 40px;gap:0;
    transform:translateX(100%);
    transition:transform .28s ease;
    overflow-y:auto;
  }
  .nav a{
    border-left:0;
    padding:16px 0;
    font-size:15px;letter-spacing:.05em;
    border-bottom:1px solid var(--hair);
  }
  body.nav-open{overflow:hidden}
  body.nav-open .nav{transform:translateX(0)}

  /* dimmed overlay sits below the header+drawer layer (z-index:50) so it
     dims the page content but never the drawer itself */
  .nav-overlay{
    display:block;position:fixed;inset:0;z-index:40;
    background:rgba(10,10,10,.45);
    opacity:0;visibility:hidden;
    transition:opacity .28s ease,visibility .28s ease;
  }
  body.nav-open .nav-overlay{opacity:1;visibility:visible}

  /* hamburger morphs into an X while open */
  body.nav-open .nav-toggle{position:fixed;top:18px;right:22px;z-index:65;
    background:transparent;border-color:transparent}
  body.nav-open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  body.nav-open .nav-toggle span:nth-child(2){opacity:0}
  body.nav-open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
}