/* SÖNMEZ MÜHENDİSLİK — Alüminyum Gri Açık Tema */

:root{
  --bg-0:#ffffff;
  --bg-1:#f8fafc;
  --bg-2:#f1f5f9;
  --surface:#ffffff;
  --surface-2:#f8fafc;
  --surface-3:#f1f5f9;
  --border:rgba(15,23,42,0.10);
  --border-2:rgba(15,23,42,0.18);
  --text:#0f172a;
  --text-dim:#475569;
  --text-mute:#64748b;
  --brand:#0f172a;
  --brand-2:#334155;
  --accent:#64748b;
  --amber:#d97706;
  --amber-2:#f59e0b;
  --metal-1:#cbd5e1;
  --metal-2:#94a3b8;
  --grad-metal:linear-gradient(135deg,#334155 0%,#64748b 50%,#94a3b8 100%);
  --grad-card:linear-gradient(135deg,#f1f5f9 0%,#cbd5e1 100%);
  --grad-hero:linear-gradient(180deg,#ffffff 0%,#f8fafc 100%);
  --serif:'Fraunces',Georgia,serif;
  --sans:'Inter',system-ui,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,monospace;
  --shadow-card:0 4px 12px -4px rgba(15,23,42,0.08);
  --shadow-lift:0 20px 40px -16px rgba(15,23,42,0.12);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);background:var(--bg-0);color:var(--text);
  line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
::selection{background:var(--brand);color:#fff}

/* NAVBAR */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  padding:1.25rem 3rem;
  display:flex;align-items:center;justify-content:space-between;
  backdrop-filter:blur(18px) saturate(1.4);
  -webkit-backdrop-filter:blur(18px) saturate(1.4);
  background:rgba(255,255,255,0.85);
  border-bottom:1px solid var(--border);
  transition:padding 0.3s ease,box-shadow 0.3s ease;
}
.nav.scrolled{padding:0.9rem 3rem;background:rgba(255,255,255,0.95);box-shadow:0 4px 20px -8px rgba(15,23,42,0.08)}
.logo{display:flex;align-items:center;gap:0.75rem;font-family:var(--serif);font-size:1.35rem;font-weight:500;letter-spacing:-0.01em;color:var(--text);text-decoration:none}
.logo-mark{
  width:36px;height:36px;background:var(--grad-metal);border-radius:9px;
  display:grid;place-items:center;font-family:var(--mono);font-weight:600;font-size:1.05rem;color:#fff;
  box-shadow:0 4px 12px -2px rgba(15,23,42,0.25);position:relative;overflow:hidden;
}
.logo-mark::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(135deg,transparent 40%,rgba(255,255,255,0.4) 50%,transparent 60%);
  animation:shine 3s ease-in-out infinite;
}
@keyframes shine{0%,100%{transform:translateX(-100%)}50%{transform:translateX(100%)}}
.logo-text small{display:block;font-size:0.7rem;color:var(--text-mute);font-family:var(--sans);font-weight:400;letter-spacing:0.15em;text-transform:uppercase;margin-top:-2px}

.nav-menu{display:flex;gap:2.25rem;align-items:center}
.nav-link{color:var(--text-mute);text-decoration:none;font-size:0.92rem;font-weight:400;position:relative;padding:0.4rem 0;transition:color 0.2s}
.nav-link::after{content:"";position:absolute;bottom:0;left:0;width:0;height:1px;background:var(--brand);transition:width 0.3s ease}
.nav-link:hover{color:var(--text)}
.nav-link:hover::after{width:100%}
.nav-link.active{color:var(--text)}
.nav-link.active::after{width:100%}

.nav-actions{display:flex;gap:0.6rem;align-items:center}
.lang-switch{display:flex;background:var(--surface-2);border:1px solid var(--border);border-radius:99px;padding:3px;font-family:var(--mono);font-size:0.72rem;font-weight:500}
.lang-switch a{
  background:none;border:none;color:var(--text-mute);
  padding:0.35rem 0.7rem;border-radius:99px;cursor:pointer;
  transition:all 0.25s;letter-spacing:0.05em;text-decoration:none;
}
.lang-switch a.active{background:var(--brand);color:#fff}

.btn-cta{background:var(--surface);border:1px solid var(--border-2);color:var(--text);padding:0.55rem 1.1rem;border-radius:99px;font-size:0.85rem;font-weight:500;text-decoration:none;display:inline-flex;align-items:center;gap:0.4rem;transition:all 0.25s;cursor:pointer}
.btn-cta:hover{background:var(--brand);border-color:var(--brand);color:#fff;transform:translateY(-1px)}

.menu-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.5rem;cursor:pointer;padding:0.5rem}

/* PAGE HERO */
.page-hero{padding:10rem 3rem 5rem;position:relative;overflow:hidden;background:var(--grad-hero)}
.page-hero-grid{
  position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(15,23,42,0.05) 1px,transparent 1px),linear-gradient(90deg,rgba(15,23,42,0.05) 1px,transparent 1px);
  background-size:60px 60px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 40%,#000 30%,transparent 80%);
}
.page-hero-inner{max-width:1280px;margin:0 auto;position:relative;z-index:2;display:grid;grid-template-columns:1fr auto;gap:3rem;align-items:end}
.breadcrumb{font-family:var(--mono);font-size:0.78rem;color:var(--text-mute);letter-spacing:0.1em;margin-bottom:1.5rem;display:flex;gap:0.6rem;align-items:center;text-transform:uppercase}
.breadcrumb a{color:var(--text-mute);text-decoration:none;transition:color 0.2s}
.breadcrumb a:hover{color:var(--text)}
.breadcrumb .sep{opacity:0.4}
.breadcrumb .current{color:var(--amber);font-weight:500}
.page-eyebrow{display:inline-flex;align-items:center;gap:0.6rem;background:var(--surface);border:1px solid var(--border-2);padding:0.4rem 0.9rem;border-radius:99px;font-size:0.78rem;color:var(--text-dim);font-family:var(--mono);letter-spacing:0.05em;margin-bottom:1.75rem;box-shadow:var(--shadow-card)}
.page-eyebrow span:first-child{color:var(--amber)}
.page-title{font-family:var(--serif);font-size:clamp(2.75rem,6vw,5.5rem);font-weight:400;line-height:1;letter-spacing:-0.035em;margin-bottom:1.5rem;color:var(--text)}
.page-title em{font-style:italic;font-weight:300;color:var(--text-dim)}
.page-sub{font-size:1.15rem;color:var(--text-dim);max-width:560px;line-height:1.6}

/* BUTTONS */
.btn-primary{
  padding:1rem 1.75rem;border-radius:99px;font-size:0.95rem;font-weight:500;
  text-decoration:none;display:inline-flex;align-items:center;gap:0.6rem;
  transition:all 0.3s cubic-bezier(0.4,0,0.2,1);cursor:pointer;border:none;
  font-family:var(--sans);
  background:var(--brand);color:#fff;
  box-shadow:0 8px 20px -8px rgba(15,23,42,0.3);
  position:relative;overflow:hidden;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px -8px rgba(15,23,42,0.4);background:var(--brand-2)}
.btn-ghost{
  padding:1rem 1.75rem;border-radius:99px;font-size:0.95rem;font-weight:500;
  text-decoration:none;display:inline-flex;align-items:center;gap:0.6rem;
  transition:all 0.3s cubic-bezier(0.4,0,0.2,1);cursor:pointer;
  background:var(--surface);color:var(--text);border:1px solid var(--border-2);
}
.btn-ghost:hover{background:var(--surface-2);border-color:var(--brand);transform:translateY(-2px)}

/* SECTION */
.section{padding:7rem 3rem;position:relative}
.section-inner{max-width:1280px;margin:0 auto}
.section-head{
  display:grid;grid-template-columns:auto 1fr;gap:3rem;align-items:end;
  margin-bottom:4rem;padding-bottom:2rem;border-bottom:1px solid var(--border);
}
.section-num{font-family:var(--mono);font-size:0.8rem;color:var(--text-mute);letter-spacing:0.15em}
.section-title{font-family:var(--serif);font-size:clamp(2rem,4vw,3.5rem);font-weight:400;line-height:1.05;letter-spacing:-0.03em;color:var(--text)}
.section-title em{font-style:italic;font-weight:300;color:var(--text-dim)}
.section-desc{font-size:1.05rem;color:var(--text-dim);max-width:480px;justify-self:end;text-align:right}

/* CTA STRIP - koyu kontrast */
.cta-strip{
  margin:0 3rem 0;padding:4rem 3rem;
  background:linear-gradient(135deg,#0f172a 0%,#1e293b 100%);
  color:#ffffff;
  border-radius:28px;
  display:grid;grid-template-columns:1.5fr auto;gap:3rem;align-items:center;
  position:relative;overflow:hidden;
}
.cta-strip::before{content:"";position:absolute;top:-50%;right:-10%;width:600px;height:600px;background:radial-gradient(circle,rgba(245,158,11,0.15) 0%,transparent 60%);pointer-events:none}
.cta-strip::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,0.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,0.03) 1px,transparent 1px);
  background-size:40px 40px;
  mask-image:radial-gradient(ellipse 80% 80% at 50% 50%,#000 30%,transparent 80%);
}
.cta-strip h3{font-family:var(--serif);font-size:clamp(1.5rem,3vw,2.5rem);font-weight:400;line-height:1.1;letter-spacing:-0.02em;margin-bottom:0.75rem;position:relative;color:#ffffff}
.cta-strip p{color:rgba(255,255,255,0.7);font-size:1.05rem;position:relative}
.cta-strip .btn-primary{background:var(--amber);box-shadow:0 8px 20px -6px rgba(217,119,6,0.5)}
.cta-strip .btn-primary:hover{background:var(--amber-2);box-shadow:0 12px 28px -6px rgba(217,119,6,0.6)}

/* FOOTER - koyu */
footer{margin-top:7rem;padding:5rem 3rem 2.5rem;background:#0f172a;color:rgba(255,255,255,0.85);border-top:none}
.foot-inner{max-width:1280px;margin:0 auto;display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:3rem;margin-bottom:3rem}
.foot-brand{font-family:var(--serif);font-size:1.6rem;font-weight:500;margin-bottom:1rem;letter-spacing:-0.02em;color:#ffffff}
.foot-brand em{font-style:italic;font-weight:300;color:rgba(255,255,255,0.55)}
.foot-tag{color:rgba(255,255,255,0.6);font-size:0.92rem;max-width:340px;line-height:1.6}
.foot-col h5{font-family:var(--mono);font-size:0.72rem;color:rgba(255,255,255,0.45);text-transform:uppercase;letter-spacing:0.15em;margin-bottom:1.25rem}
.foot-col a,.foot-col p{display:block;color:rgba(255,255,255,0.65);text-decoration:none;font-size:0.9rem;margin-bottom:0.65rem;transition:color 0.2s}
.foot-col a:hover{color:#ffffff}
.foot-bottom{max-width:1280px;margin:0 auto;padding-top:2rem;border-top:1px solid rgba(255,255,255,0.1);display:flex;justify-content:space-between;align-items:center;font-family:var(--mono);font-size:0.75rem;color:rgba(255,255,255,0.45)}

/* UTILITIES */
.reveal{opacity:0;transform:translateY(30px);transition:opacity 0.8s ease,transform 0.8s ease}
.reveal.in{opacity:1;transform:translateY(0)}

/* RESPONSIVE */
@media (max-width:980px){
  .nav{padding:1rem 1.5rem}
  .nav.scrolled{padding:0.8rem 1.5rem}
  .nav-menu{
    display:none;position:absolute;top:100%;left:0;right:0;
    background:rgba(255,255,255,0.98);backdrop-filter:blur(18px);
    flex-direction:column;padding:1.5rem;gap:1rem;
    border-bottom:1px solid var(--border);
    box-shadow:0 8px 20px -8px rgba(15,23,42,0.1);
  }
  .nav-menu.open{display:flex}
  .menu-toggle{display:block}
  .page-hero{padding:7rem 1.5rem 3rem}
  .page-hero-inner{grid-template-columns:1fr;gap:2rem}
  .section{padding:5rem 1.5rem}
  .section-head{grid-template-columns:1fr;gap:1rem}
  .section-desc{justify-self:start;text-align:left;max-width:100%}
  .cta-strip{margin:0 1.5rem;padding:2.5rem;grid-template-columns:1fr}
  footer{padding:4rem 1.5rem 2rem}
  .foot-inner{grid-template-columns:1fr 1fr;gap:2rem}
  .foot-bottom{flex-direction:column;gap:1rem}
}