/* =====================================================================
   STELLA B2B — DESIGN SYSTEM
   Felsefe: "Mühendislik Hassasiyeti" — endüstriyel, otoriter, modern B2B
   Bu dosya Claude Code devri için tasarım token kaynağıdır.
   ===================================================================== */

/* ---- FONTLAR ---- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

:root{
  /* ---- RENK: ZEMİN (Endüstriyel Gece) ---- */
  --bg-900:#0F141B;          /* en koyu — footer, kuyular */
  --bg-800:#151A22;          /* birincil zemin */
  --bg-700:#1A202C;          /* yükseltilmiş zemin */
  --bg-650:#1F2733;          /* hover yüzeyi */

  /* ---- RENK: CAM YÜZEYLER (Glassmorphism) ---- */
  --glass:rgba(31,39,51,0.55);
  --glass-strong:rgba(21,26,34,0.72);
  --glass-border:rgba(255,255,255,0.10);
  --glass-border-soft:rgba(255,255,255,0.06);

  /* ---- RENK: VURGU (Stella Turkuazı) ---- */
  --accent:#7EB3B2;
  --accent-bright:#95C7C6;
  --accent-dim:#5E8F8E;
  --accent-glow:rgba(126,179,178,0.35);
  --accent-wash:rgba(126,179,178,0.08);

  /* ---- RENK: METİN ---- */
  --text:#F4F7FA;            /* başlık beyazı */
  --text-soft:#C2CAD4;       /* gövde */
  --text-mute:#8A94A0;       /* ikincil / etiket */
  --text-faint:#5A636E;      /* en sönük */

  /* ---- RENK: TEKNİK ÇİZGİ (Blueprint) ---- */
  --line:rgba(255,255,255,0.08);
  --line-soft:rgba(255,255,255,0.045);
  --line-accent:rgba(126,179,178,0.22);

  /* ---- TİPOGRAFİ ---- */
  --font-head:'Plus Jakarta Sans', system-ui, sans-serif;
  --font-body:'Inter', system-ui, sans-serif;
  --tracking-head:-0.02em;

  /* ---- GEOMETRİ (keskin, endüstriyel) ---- */
  --r-xs:2px;
  --r-sm:4px;
  --r-md:6px;
  --r-lg:10px;

  /* ---- DÜZEN ---- */
  --maxw:1320px;
  --gutter:clamp(20px, 4vw, 64px);

  /* ---- HAREKET ---- */
  --ease:cubic-bezier(0.22,0.61,0.36,1);
  --ease-out:cubic-bezier(0.16,1,0.3,1);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg-800);
  color:var(--text-soft);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  font-feature-settings:"tnum" 1, "cv05" 1;
  overflow-x:hidden;
}
img{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;}
::selection{background:var(--accent-glow);color:#fff;}

/* ---- BLUEPRINT GRID ZEMİN (yardımcı) ---- */
.bp-grid{
  position:relative;
  background-color:var(--bg-800);
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size:48px 48px;
}
.bp-grid--fine{
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size:24px 24px;
}

/* ---- TİPOGRAFİ ÖLÇEĞİ ---- */
.eyebrow{
  font-family:var(--font-body);
  font-weight:600;
  font-size:13px;
  letter-spacing:0.22em;
  text-transform:uppercase;
  color:var(--accent);
  display:inline-flex;
  align-items:center;
  gap:12px;
}
.eyebrow::before{
  content:"";
  width:28px;height:1px;background:var(--accent);
  display:inline-block;opacity:.7;
}
h1,h2,h3,h4{
  font-family:var(--font-head);
  color:var(--text);
  letter-spacing:var(--tracking-head);
  line-height:1.05;
  margin:0;
  font-weight:700;
}
.h-display{font-size:clamp(40px, 6vw, 84px);font-weight:800;line-height:0.98;}
.h-1{font-size:clamp(32px, 4.4vw, 56px);}
.h-2{font-size:clamp(26px, 3vw, 40px);}
.h-3{font-size:clamp(20px, 2vw, 26px);font-weight:600;}
.lead{font-size:clamp(17px,1.4vw,20px);color:var(--text-soft);line-height:1.65;}

/* ---- DÜZEN YARDIMCILARI ---- */
.container{max-width:var(--maxw);margin:0 auto;padding-inline:var(--gutter);}
.section{padding-block:clamp(72px, 9vw, 132px);}
.eyebrow-row{display:flex;align-items:center;gap:16px;}

/* ---- BUTONLAR (keskin köşe) ---- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-body);font-weight:600;font-size:15px;
  padding:14px 24px;border-radius:var(--r-sm);
  border:1px solid transparent;
  transition:all .25s var(--ease);
  letter-spacing:-0.01em;white-space:nowrap;
}
.btn .ic{width:17px;height:17px;stroke-width:2;}
.btn--primary{
  background:var(--accent);color:#0F141B;
  box-shadow:0 0 0 1px var(--accent), 0 8px 30px -10px var(--accent-glow);
}
.btn--primary:hover{background:var(--accent-bright);box-shadow:0 0 0 1px var(--accent-bright),0 10px 36px -8px var(--accent-glow);transform:translateY(-1px);}
.btn--ghost{
  background:rgba(255,255,255,0.02);color:var(--text);
  border-color:var(--glass-border);
}
.btn--ghost:hover{border-color:var(--accent);color:var(--accent-bright);background:var(--accent-wash);}
.btn--lg{padding:17px 30px;font-size:16px;}

/* ---- KART (cam) ---- */
.card{
  background:var(--glass);
  border:1px solid var(--glass-border-soft);
  border-radius:var(--r-md);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  transition:border-color .3s var(--ease), transform .4s var(--ease), background .3s var(--ease);
}
.card:hover{border-color:var(--line-accent);}

/* ---- ROZET / ETİKET ---- */
.tag{
  display:inline-flex;align-items:center;gap:7px;
  font-size:12px;font-weight:600;letter-spacing:0.04em;
  padding:5px 11px;border-radius:var(--r-xs);
  border:1px solid var(--glass-border);
  color:var(--text-mute);text-transform:uppercase;
}
.tag--accent{color:var(--accent);border-color:var(--line-accent);background:var(--accent-wash);}

/* ---- KÖŞE İŞARETLERİ (teknik çerçeve) ---- */
.corner-marks{position:relative;}
.corner-marks::before,.corner-marks::after{
  content:"";position:absolute;width:14px;height:14px;
  border:1px solid var(--line-accent);pointer-events:none;
}
.corner-marks::before{top:-1px;left:-1px;border-right:0;border-bottom:0;}
.corner-marks::after{bottom:-1px;right:-1px;border-left:0;border-top:0;}

/* ---- SAYAÇ / MONO veri ---- */
.mono{font-family:var(--font-body);font-feature-settings:"tnum" 1;letter-spacing:0.02em;}
.spec-num{font-family:var(--font-head);font-weight:700;font-feature-settings:"tnum" 1;}

/* ---- SCROLL REVEAL (JS ile aktiflenir) ---- */
[data-reveal]{opacity:0;transform:translateY(26px);transition:opacity .9s var(--ease-out), transform .9s var(--ease-out);}
[data-reveal].in{opacity:1;transform:none;}
[data-reveal-d="1"]{transition-delay:.08s;}
[data-reveal-d="2"]{transition-delay:.16s;}
[data-reveal-d="3"]{transition-delay:.24s;}
[data-reveal-d="4"]{transition-delay:.32s;}
@media (prefers-reduced-motion:reduce){
  [data-reveal]{opacity:1;transform:none;transition:none;}
  html{scroll-behavior:auto;}
}