:root{
  --bg:#0b0f14;
  --surface:#0f1720;
  --muted:#9aa6b2;
  --accent:#3aa0ff;
  --accent-2:#6ba6d6;
  --glass: rgba(255,255,255,0.03);
}

*{box-sizing:border-box}

html,body{min-height:100vh}
body{
  margin:0;
  font-family:Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: linear-gradient(180deg,var(--bg),#071018 60%);
  color: #e6eef6;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
.container{max-width:1100px;margin:0 auto;padding:3rem 1rem}
@media (max-width:800px){
  .container{padding:2.5rem 1.5rem}
}
@media (max-width:500px){
  .container{padding:2rem 1.5rem}
}

html{scroll-behavior:smooth}

.site-header {
  position: fixed; 
  top: 0;
  left: 0;
  width: 100%;
  z-index: 9999; 
  padding: 0.6rem 0;
  background: linear-gradient(180deg, rgba(11, 15, 20, 0.95), rgba(11, 15, 20, 0.6));
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  will-change: transform, opacity;
}
@media (max-width:800px){
  .site-header{ padding: 0.4rem 0; }
}
@media (max-width:500px){
  .site-header{ padding: 0.3rem 0; }
}

.site-header.transition {
  transition: transform 0.36s cubic-bezier(0.2, 0.9, 0.2, 1), opacity 0.36s cubic-bezier(0.2, 0.9, 0.2, 1);
}

.site-header.hidden {
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

.site-header.visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.nav-container{display:flex;align-items:center;justify-content:space-between;max-width:1100px;margin:0 auto;padding:0 1rem}
.nav{display:flex;align-items:center;gap:1rem;max-width:1100px;margin:0 auto;padding:0 1.5rem;width:100%;justify-content:space-between}
@media (max-width:800px){
  .nav{gap:0.6rem;padding:0 1rem}
}
@media (max-width:500px){
  .nav{gap:0.4rem;padding:0 0.8rem}
}
.logo{color:var(--accent);text-decoration:none;font-weight:700;margin-right:1rem}
@media (max-width:500px){
  .logo{font-size:0.9rem;margin-right:0.5rem}
}

/* Tabbed navigation */
.tabs{display:flex;gap:.5rem;background:var(--glass);padding:.22rem;border-radius:12px;border:1px solid rgba(255,255,255,0.03)}
.tab{display:inline-block;padding:.55rem .9rem;color:var(--muted);text-decoration:none;border-radius:8px;font-weight:600;transition:all .18s ease}
.tab:hover{color:var(--accent);transform:translateY(-2px)}
.tab.active, .tab[aria-selected="true"]{background:linear-gradient(90deg,var(--accent),var(--accent-2));color:#021018}

/* Menü Linkleri */
.nav-links{list-style:none;margin:0;padding:0;display:flex;gap:1rem;align-items:center;flex-wrap:wrap}
.nav-links a{color:var(--muted);text-decoration:none;padding:0.4rem 0.6rem;border-radius:6px; font-weight: 500; transition: color 0.2s}
@media (max-width:800px){
  .nav-links a{padding:0.3rem 0.5rem;font-size:0.95rem}
}
@media (max-width:500px){
  .nav-links a{padding:0.25rem 0.4rem;font-size:0.85rem}
}
.nav-links a:hover{color:var(--accent)}
.nav-links a.active{color:var(--accent)}

/* Language selector separation and active language bold */
.nav-links li.lang{display:flex;align-items:center;gap:0.5rem}
.nav-links li.lang::before{content:"|";color:var(--muted);margin-right:0.5rem}
.nav-links .lang-link{color:var(--muted);text-decoration:none;padding:0.2rem 0.35rem;border-radius:4px;font-weight:500}
.nav-links .lang-link:hover{color:var(--accent)}
.nav-links .lang-link.lang-active{font-weight:700;color:var(--accent)}

/* Mobile: remove leading separator and keep layout tidy */
@media (max-width:500px){
  .nav-links li.lang::before{content:"";margin-right:0}
  .nav-links li.lang{margin-left:6px}
}

section{scroll-margin-top:80px}

/* Hero */
.hero{min-height:100vh;display:flex;align-items:center;position:relative;padding-top:60px}
.hero-inner{display:flex;gap:3rem;align-items:center}
@media (max-width:800px){
  .hero{min-height:auto;padding:3rem 0}
  .hero-inner{flex-direction:column;text-align:center;gap:2rem}
}
@media (max-width:500px){
  .hero-inner{gap:1.5rem}
}
.profile-frame{width:180px;height:180px;border-radius:999px;padding:6px;background:linear-gradient(135deg,var(--accent),var(--accent-2));display:flex;align-items:center;justify-content:center}
@media (max-width:800px){
  .profile-frame{width:150px;height:150px}
}
@media (max-width:500px){
  .profile-frame{width:140px;height:140px}
}
.profile-img{width:100%;height:100%;border-radius:999px;display:block;background:var(--surface);padding:8px}
.name{font-size:2.6rem;margin:0}
@media (max-width:800px){
  .name{font-size:2rem}
}
@media (max-width:500px){
  .name{font-size:1.6rem}
}
.tagline{color:var(--muted);margin-top:.6rem;line-height:1.4}
@media (max-width:800px){
  .tagline{font-size:0.95rem;margin-top:0.5rem}
}
@media (max-width:500px){
  .tagline{font-size:0.85rem;margin-top:0.4rem}
}
.cta{display:inline-block;margin-top:1rem;padding:.6rem 1rem;background:linear-gradient(90deg,var(--accent),var(--accent-2));color:#021018;border-radius:8px;text-decoration:none;font-weight:600}
@media (max-width:500px){
  .cta{padding:0.5rem 0.8rem;font-size:0.9rem}
}
.scroll-hint{position:absolute;bottom:1.2rem;left:50%;transform:translateX(-50%);color:var(--muted);font-size:.9rem}

/* Sections */
.section{padding:6rem 0}
@media (max-width:800px){
  .section{padding:4rem 0}
}
@media (max-width:500px){
  .section{padding:3rem 0}
}
h2{margin:0 0 1rem 0;color:#dfeaf6}
@media (max-width:800px){
  h2{font-size:1.5rem}
}
@media (max-width:500px){
  h2{font-size:1.3rem}
}
.reveal{opacity:0;transform:translateY(18px);transition:all .7s cubic-bezier(.2,.9,.2,1)}
.reveal.visible{opacity:1;transform:none}

.skills-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1rem;align-items:start}
@media (max-width:800px){
  .skills-grid{grid-template-columns:repeat(2,1fr);gap:0.9rem}
}
@media (max-width:500px){
  .skills-grid{grid-template-columns:1fr;gap:0.8rem}
}

/* Skill Kartı Güncellendi */
.skill{
  background:var(--glass);
  padding:1rem;
  border-radius:10px;
  color:var(--muted);
  border: 1px solid rgba(255, 255, 255, 0.05); /* Standart çerçeve */
  overflow:hidden;
  cursor:pointer;
  min-height:56px;
  display:flex;
  flex-direction:column;
  justify-content:flex-start;
  align-self:start;
  transition: all 0.25s cubic-bezier(.2,.9,.2,1);
  outline: none !important; /* Outline tamamen kapatıldı */
}
@media (max-width:800px){
  .skill{padding:0.9rem;min-height:52px}
}
@media (max-width:500px){
  .skill{padding:0.8rem;min-height:48px;font-size:0.95rem}
}

.skill:hover{
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(58, 160, 255, 0.3);
  color:var(--accent);
}

/* Expanded State Güncellendi - Sorunu çözen kısım */
.skill.expanded {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(58, 160, 255, 0.15); /* Outline yerine shadow kullanıldı */
  background: rgba(58, 160, 255, 0.02);
}

.skill .inline-detail{
  background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  color:var(--muted);
  border-radius:8px;
  margin-top:10px;
  padding:0 1rem;
  box-shadow:0 6px 18px rgba(2,8,15,0.06);
  border:1px solid rgba(255,255,255,0.03);
  overflow:hidden;
  max-height:0;
  transition:max-height .32s ease, padding .28s ease;
}

.skill.expanded .inline-detail{
  padding:0.9rem 1rem 1rem 1rem;
  max-height:360px;
}

.inline-detail h4{margin:0 0 .4rem 0;color:var(--accent-2);font-size:0.95rem}
.inline-detail p{margin:0;color:var(--muted);line-height:1.45;font-size:0.9rem}

@media (max-width:500px){
  .inline-detail h4{font-size:0.9rem}
  .inline-detail p{font-size:0.85rem}
}

.approach-list{margin-top:1rem;color:var(--muted)}

/* Contact Card - Premium focus styling */
.contact-card{
  background:linear-gradient(135deg, rgba(58,160,255,0.05), rgba(107,166,214,0.03));
  border:2px solid var(--accent);
  border-radius:14px;
  padding:2rem;
  margin-top:1.5rem;
  box-shadow:0 8px 32px rgba(58,160,255,0.12), inset 0 1px 0 rgba(255,255,255,0.06);
  backdrop-filter:blur(8px);
}

.contact-card .contact-list{
  margin:0;
  font-size:1.05rem;
  line-height:1.6;
  display:flex;
  flex-wrap:wrap;
  gap:0.5rem;
}

.contact-list a{color:var(--accent);text-decoration:none;font-weight:600;transition:color .2s ease}
.contact-list a:hover{color:var(--accent-2)}

@media (max-width:800px){
  .contact-card{
    padding:1.5rem;
    margin-top:1rem;
  }
  .contact-card .contact-list{
    font-size:1rem;
  }
}

@media (max-width:500px){
  .contact-card{
    width:100%;
    padding:1rem;
    margin-top:0.8rem;
    border-radius:10px;
  }
  .contact-card .contact-list{
    font-size:0.9rem;
    line-height:1.5;
    flex-direction:column;
    gap:0;
  }
  .contact-list a{
    word-break:break-word;
    display:inline-block;
  }
}

/* Footer */
.site-footer{padding:2rem 0;text-align:center;color:var(--muted);border-top:1px solid rgba(255,255,255,0.02)}

/* Responsive - legacy, kept for compatibility */

@keyframes floaty{0%{transform:translateY(0)}50%{transform:translateY(-6px)}100%{transform:translateY(0)}}
.profile-frame{animation:floaty 6s ease-in-out infinite}

a:focus{outline:none;}