/* ============================================================
   Musa Gül personal site
   Palette sampled from the Musa Gül wordmark:
   navy #241854 · azure #0C6CB4 · white base
   ============================================================ */
:root{
  --navy:#241854;
  --navy-2:#2d2270;
  --azure:#0C6CB4;
  --azure-lt:#3aa0e0;
  --ink:#1a1533;
  --muted:#5b6478;
  --bg:#ffffff;
  --tint:#eef3f8;
  --tint-2:#e5edf6;
  --line:#dbe4ef;
  --white:#fff;
  --radius:18px;
  --shadow:0 18px 50px -22px rgba(20,25,70,.35);
  --shadow-sm:0 8px 24px -14px rgba(20,25,70,.30);
  --maxw:1180px;
  --font:"Inter","Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3{line-height:1.12;letter-spacing:-.02em;color:var(--navy)}
section{scroll-margin-top:84px}

/* ---------- animated background ---------- */
.bg-layer{position:fixed;inset:0;z-index:-1;overflow:hidden;background:
  radial-gradient(1200px 700px at 78% -8%, var(--tint) 0%, transparent 60%),
  radial-gradient(900px 600px at 5% 12%, #f2f7fc 0%, transparent 55%),
  var(--bg);}
.bg-grid{position:absolute;inset:0;opacity:.5;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),
    linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:52px 52px;
  -webkit-mask-image:radial-gradient(circle at 70% 8%, #000 0%, transparent 65%);
  mask-image:radial-gradient(circle at 70% 8%, #000 0%, transparent 65%);}
.sonar{position:absolute;top:-120px;right:-120px;width:640px;height:640px}
.sonar span{position:absolute;inset:0;margin:auto;border:1.5px solid rgba(12,108,180,.22);
  border-radius:50%;width:100%;height:100%;animation:sonar 6s ease-out infinite}
.sonar span:nth-child(2){animation-delay:2s}
.sonar span:nth-child(3){animation-delay:4s}
@keyframes sonar{0%{transform:scale(.25);opacity:.9}80%{opacity:.05}100%{transform:scale(1);opacity:0}}
.bg-glow{position:absolute;border-radius:50%;filter:blur(90px);opacity:.35}
.bg-glow-a{width:420px;height:420px;left:-120px;top:38%;background:rgba(12,108,180,.30)}
.bg-glow-b{width:380px;height:380px;right:-90px;bottom:6%;background:rgba(36,24,84,.20)}
@media(prefers-reduced-motion:reduce){.sonar span{animation:none;opacity:.08}}

/* ---------- nav ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;display:flex;align-items:center;
  gap:22px;padding:14px clamp(18px,4vw,44px);
  background:rgba(255,255,255,.72);backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;transition:.3s}
.nav.scrolled{background:rgba(255,255,255,.9);border-bottom-color:var(--line);
  box-shadow:0 6px 24px -18px rgba(20,25,70,.5)}
.nav-brand{margin-right:auto;display:flex;align-items:center}
.nav-logo{height:34px;width:auto}
.nav-links{display:flex;gap:26px}
.nav-links a{font-size:.92rem;font-weight:500;color:var(--muted);position:relative;padding:4px 0;transition:.2s}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;
  background:linear-gradient(90deg,var(--navy),var(--azure));transition:.25s}
.nav-links a:hover{color:var(--navy)}
.nav-links a:hover::after{width:100%}
.lang-switch{display:flex;align-items:center;gap:6px;font-weight:600;font-size:.86rem}
.lang-switch button{background:none;border:none;cursor:pointer;color:var(--muted);
  font:inherit;font-weight:600;padding:3px 6px;border-radius:7px;transition:.2s}
.lang-switch button.is-active{color:var(--white);background:var(--navy)}
.lang-switch span{color:var(--line)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{width:24px;height:2px;background:var(--navy);border-radius:2px;transition:.3s}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:.95rem;
  padding:13px 24px;border-radius:12px;cursor:pointer;transition:transform .18s,box-shadow .18s,background .2s;border:1.5px solid transparent}
.btn-primary{background:linear-gradient(120deg,var(--navy),var(--azure));color:#fff;
  box-shadow:0 12px 26px -12px rgba(12,108,180,.6)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 34px -12px rgba(12,108,180,.7)}
.btn-ghost{border-color:var(--line);color:var(--navy);background:rgba(255,255,255,.6)}
.btn-ghost:hover{border-color:var(--azure);color:var(--azure);transform:translateY(-2px)}

/* ---------- layout helpers ---------- */
.section{max-width:var(--maxw);margin:0 auto;padding:96px clamp(18px,4vw,44px)}
.section-title{font-size:clamp(1.7rem,3.4vw,2.5rem);font-weight:800;margin-bottom:10px;display:flex;align-items:center;gap:14px}
.section-title span{position:relative}
.section-title span::after{content:"";position:absolute;left:0;bottom:2px;width:100%;height:10px;
  background:linear-gradient(90deg,rgba(12,108,180,.22),transparent);z-index:-1}
.section-sub{color:var(--muted);font-size:1.05rem;margin-bottom:40px;max-width:620px}

/* ---------- hero ---------- */
.hero{max-width:var(--maxw);margin:0 auto;min-height:100vh;display:grid;
  grid-template-columns:1.15fr .85fr;align-items:center;gap:48px;
  padding:120px clamp(18px,4vw,44px) 70px}
.eyebrow{text-transform:uppercase;letter-spacing:.18em;font-size:.8rem;font-weight:700;
  color:var(--azure);margin-bottom:16px}
.hero-name{font-size:clamp(2.6rem,7vw,4.6rem);font-weight:800}
.hero-tagline{font-size:clamp(1.05rem,1.5vw,1.22rem);color:var(--muted);margin:20px 0 26px;max-width:560px}
.hero-roles{display:flex;flex-direction:column;align-items:flex-start;gap:10px;margin-bottom:30px}
.role-chip{display:inline-flex;flex-wrap:wrap;align-items:baseline;gap:8px;
  background:var(--tint);border:1px solid var(--line);border-radius:999px;
  padding:9px 18px;font-size:.95rem;color:var(--navy);transition:.2s}
.role-chip:hover{border-color:var(--azure);background:#fff;transform:translateX(4px);
  box-shadow:0 8px 20px -12px rgba(12,108,180,.5)}
.role-chip b{color:var(--azure)}
.role-logo-full{height:24px;width:auto;align-self:center;flex-shrink:0}
.role-note{font-size:.78rem;color:var(--muted)}
.hero-stats{display:flex;gap:30px;margin-bottom:34px;flex-wrap:wrap}
.stat{display:flex;flex-direction:column}
.stat-num{font-size:2rem;font-weight:800;color:var(--navy);line-height:1}
.stat-num span{color:var(--azure)}
.stat-lbl{font-size:.82rem;color:var(--muted);margin-top:5px;max-width:140px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}

.hero-portrait{display:flex;justify-content:center}
.portrait-frame{position:relative;width:min(100%,380px);aspect-ratio:1/1;border-radius:26px;
  padding:6px;background:linear-gradient(150deg,var(--azure),var(--navy));
  box-shadow:0 40px 80px -30px rgba(12,108,180,.55)}
.portrait-frame img{width:100%;height:100%;object-fit:cover;border-radius:21px}
.portrait-frame::after{content:"";position:absolute;inset:-14px;border-radius:34px;
  border:1px solid rgba(12,108,180,.25);pointer-events:none}
.portrait-badge{position:absolute;left:50%;bottom:-26px;transform:translateX(-50%);
  background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border:1px solid var(--line);
  border-radius:14px;padding:10px 18px;box-shadow:var(--shadow-sm)}
.portrait-badge img{height:22px;width:auto}

/* ---------- career journey ---------- */
.journey{display:grid;grid-template-columns:repeat(12,1fr);gap:18px 40px;margin-top:10px}
.j-stop{grid-column:span 3}
.j-stop:nth-child(n+5){grid-column:span 4}
.j-stop{position:relative;display:flex;flex-direction:row;align-items:center;gap:12px;
  min-width:0;
  background:rgba(255,255,255,.82);border:1px solid var(--line);border-radius:16px;
  padding:14px 14px;box-shadow:var(--shadow-sm);transition:.25s}

.j-stop:not(:last-child)::after{content:"";position:absolute;right:-31px;top:50%;
  width:22px;height:2px;background:linear-gradient(90deg,var(--azure),transparent)}
.j-stop:nth-child(4n)::after,.j-stop:nth-child(4n)::before{display:none}
.j-stop:not(:last-child)::before{content:"";position:absolute;right:-15px;top:50%;
  transform:translateY(-3.5px) rotate(45deg);width:7px;height:7px;
  border-top:2px solid var(--azure);border-right:2px solid var(--azure);opacity:.85}
.j-stop:hover{transform:translateY(-4px);border-color:var(--azure);box-shadow:var(--shadow)}
.j-body{display:flex;flex-direction:column;gap:2px;min-width:0}
.j-logo{width:34px;height:34px;flex-shrink:0;border-radius:50%;object-fit:contain;
  background:#fff;border:1px solid var(--line);padding:3px}
.j-org{font-weight:800;color:var(--navy);font-size:1rem;line-height:1.25}
.j-role{font-size:.84rem;color:var(--muted);line-height:1.35}
.j-founder{background:linear-gradient(120deg,var(--navy),var(--navy-2));border-color:transparent}
.j-founder .j-org{color:#fff}
.j-founder .j-role{color:var(--azure-lt);font-weight:600}
.j-now{background:linear-gradient(120deg,var(--navy),var(--navy-2));border-color:transparent}
.j-now .j-org{color:#fff}
.j-now .j-role{color:var(--azure-lt);font-weight:600}

/* ---------- academic (single panel, university circle) ---------- */
.academic-panel{position:relative;overflow:hidden;max-width:820px;
  background:linear-gradient(135deg,#fff 0%,var(--tint) 55%,#e8f0f9 100%);
  border:1px solid var(--line);border-radius:24px;
  padding:14px 38px;box-shadow:var(--shadow-sm);margin-top:10px}
.academic-panel::before{content:"";position:absolute;width:340px;height:340px;border-radius:50%;
  right:-120px;top:-140px;background:radial-gradient(circle,rgba(12,108,180,.16),transparent 65%)}
.academic-panel::after{content:"";position:absolute;width:300px;height:300px;border-radius:50%;
  left:-110px;bottom:-150px;background:radial-gradient(circle,rgba(36,24,84,.12),transparent 65%)}
.academic-record{display:flex;flex-direction:column;min-width:0}
.ar-row{position:relative;z-index:1;display:flex;align-items:center;gap:20px;padding:22px 4px}
.ar-row:not(:last-child){border-bottom:1px solid var(--line)}
.ar-abbr{flex-shrink:0;width:58px;text-align:center;font-weight:800;font-size:.85rem;color:#fff;padding:7px 0;border-radius:10px;background:linear-gradient(120deg,var(--navy),var(--azure));box-shadow:0 8px 18px -10px rgba(12,108,180,.6)}
.ar-deg{font-size:1.05rem;font-weight:600;color:var(--navy)}
.ar-spec{display:block;font-weight:500;font-size:.88rem;color:var(--muted);margin-top:2px}

/* ---------- research ---------- */
.research-wrap{display:grid;grid-template-columns:1fr 1.05fr;gap:44px;align-items:center;margin-top:8px}
.pill{display:inline-block;font-size:.76rem;font-weight:700;letter-spacing:.04em;
  padding:5px 12px;border-radius:999px;margin:0 8px 14px 0}
.pill-ieee{background:var(--navy);color:#fff}
.pill-status{background:var(--tint-2);color:var(--navy);border:1px solid var(--line)}
.research-name{font-size:clamp(1.4rem,2.6vw,2rem);font-weight:800;margin-bottom:14px}
.research-desc{color:var(--muted);font-size:1.02rem;margin-bottom:14px}
.research-desc b{color:var(--navy)}
.research-desc code{background:var(--tint-2);padding:1px 6px;border-radius:5px;font-size:.9em;color:var(--navy)}
.research-authors{font-size:.9rem;color:var(--muted);margin-bottom:24px}
.browser{display:block;border-radius:14px;overflow:hidden;border:1px solid var(--line);
  box-shadow:var(--shadow);background:#fff;transition:.3s}
.browser:hover{transform:translateY(-4px);box-shadow:0 30px 70px -28px rgba(12,108,180,.5)}
.browser-bar{display:flex;align-items:center;gap:8px;padding:10px 14px;background:var(--tint);border-bottom:1px solid var(--line)}
.browser-bar .dot{width:11px;height:11px;border-radius:50%}
.dot.r{background:#ff5f57}.dot.y{background:#febc2e}.dot.g{background:#28c840}
.browser-url{flex:1;margin-left:8px;background:#fff;border:1px solid var(--line);border-radius:7px;
  padding:6px 12px;font-size:.8rem;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.browser-view{background:#fff;max-height:420px;overflow:hidden}
.browser-view img{width:100%;display:block}

/* ---------- certifications ---------- */
.cert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:6px}
.cert-card{display:flex;flex-direction:column;align-items:center;text-align:center;gap:12px;
  background:rgba(255,255,255,.82);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 18px;box-shadow:var(--shadow-sm);transition:.25s}
.cert-card:hover{transform:translateY(-5px);border-color:var(--azure);box-shadow:var(--shadow)}
.cert-more{text-align:center;margin-top:24px;color:var(--muted);font-size:.92rem;font-style:italic;letter-spacing:.04em}
.cert-badge{width:96px;height:96px;display:flex;align-items:center;justify-content:center}
.cert-badge img{max-width:100%;max-height:100%;object-fit:contain}
.cert-meta{display:flex;flex-direction:column;gap:4px}
.cert-acr{font-weight:800;color:var(--navy);font-size:1.02rem}
.cert-full{font-size:.8rem;color:var(--muted);line-height:1.35}

/* ---------- contact ---------- */
.contact{max-width:900px;text-align:center;padding-top:70px;padding-bottom:70px}
.contact-logo{height:40px;width:auto;margin:0 auto 26px;
  filter:drop-shadow(0 6px 18px rgba(36,24,84,.4))}
.contact{background:linear-gradient(140deg,var(--navy),#1b1442);border-radius:28px;
  margin-left:auto;margin-right:auto;box-shadow:var(--shadow);position:relative;overflow:hidden}
.contact::before{content:"";position:absolute;inset:0;background:
  radial-gradient(500px 300px at 80% -10%,rgba(12,108,180,.5),transparent 60%);pointer-events:none}
.contact-title{color:#fff;font-size:clamp(1.8rem,4vw,2.6rem);font-weight:800}
.contact-sub{color:rgba(255,255,255,.7);margin:10px 0 30px}
.contact-links{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;position:relative}
.clink{display:inline-flex;align-items:center;gap:10px;background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.18);color:#fff;padding:13px 22px;border-radius:12px;
  font-weight:500;transition:.2s}
.clink:hover{background:rgba(255,255,255,.16);border-color:var(--azure-lt);transform:translateY(-2px)}
.clink svg{width:20px;height:20px;fill:var(--azure-lt)}

/* ---------- footer ---------- */
.footer{text-align:center;padding:34px 20px;color:var(--muted);font-size:.86rem;border-top:1px solid var(--line)}

/* ---------- gizlilik notu ---------- */
.privacy{max-width:62ch;margin:14px auto 0;text-align:left;font-size:.8rem;line-height:1.6}
.privacy summary{cursor:pointer;text-align:center;color:var(--muted);list-style:none}
.privacy summary::-webkit-details-marker{display:none}
.privacy summary::after{content:" \203A";display:inline-block;transition:transform .2s}
.privacy[open] summary::after{transform:rotate(90deg)}
.privacy summary:hover{color:var(--fg,inherit)}
.privacy p{margin:12px 0 0;opacity:.85;user-select:text}
.privacy a{color:inherit;text-decoration:underline}


/* ---------- kopyalama caydırıcıları ---------- */
body{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;}
img{-webkit-user-drag:none;-khtml-user-drag:none;-moz-user-drag:none;user-drag:none;pointer-events:none;}
.portrait-shield{position:absolute;inset:6px;z-index:4;border-radius:21px;
  background:transparent;-webkit-user-drag:none;user-drag:none;}
a img{pointer-events:auto;}

/* ---------- reveal animation ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .nav-links,.lang-switch{position:fixed;top:62px;right:14px;flex-direction:column;
    background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 20px;
    box-shadow:var(--shadow);transform:translateY(-10px) scale(.98);opacity:0;pointer-events:none;transition:.25s}
  .lang-switch{top:auto;flex-direction:row;margin-top:0}
  .nav.open .nav-links{transform:none;opacity:1;pointer-events:auto}
  .nav.open .nav-links{top:62px}
  .nav-toggle{display:flex;order:3}
  .lang-switch{position:static;flex-direction:row;background:none;border:none;box-shadow:none;padding:0;opacity:1;transform:none;pointer-events:auto;margin-left:auto}
  .hero{grid-template-columns:1fr;text-align:center;min-height:auto;padding-top:110px;gap:36px}
  .hero-roles{align-items:center;width:100%}
  .role-chip{flex-direction:column;align-items:center;gap:2px;text-align:center;
    border-radius:16px;width:100%;max-width:420px;padding:12px 18px}
  .role-logo-full{height:22px;margin:4px 0}
  .role-chip:hover{transform:none}
  .hero-stats,.hero-cta{justify-content:center}
  .stat-lbl{max-width:none}
  .hero-portrait{order:-1}
  .portrait-frame{width:min(72%,300px)}
  .research-wrap{grid-template-columns:1fr;gap:28px}
  .cert-grid{grid-template-columns:repeat(2,1fr)}
  .academic-panel{padding:8px 20px}
  .academic-record{max-width:none;width:100%}
  .ar-deg{font-size:.98rem}
  .journey{display:flex;flex-direction:column;flex-wrap:nowrap;gap:14px}
  .j-stop{flex:none;width:100%}
  .j-stop:nth-child(4n)::after{display:none}
  .j-stop:not(:last-child){margin-right:0;margin-bottom:8px}
  .j-stop:not(:last-child)::after{right:auto;left:50%;top:auto;bottom:-16px;width:2px;height:12px;
    background:linear-gradient(var(--azure),transparent)}
  .j-stop:not(:last-child)::before{display:none}
}
@media(max-width:520px){
  .section{padding:70px 18px}
  .hero-stats{gap:20px}
  .cert-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .cert-badge{width:76px;height:76px}
}