/* ============================================================
   RVZ Bilişim — Hakkımızda
   Açık tema · siber mavi · sinematik derinlik
   ============================================================ */

:root{
  --accent:        #1a5cdb;   /* siber mavi */
  --accent-bright: #1a5cdb;
  --accent-deep:   #0061a8;

  --bg:        #e3eaf4;        /* çok açık mavi-beyaz */
  --bg-2:      #ffffff;
  --ink:       #0b1f33;        /* derin lacivert metin */
  --ink-soft:  #354a60;
  --ink-faint: #647c94;
  --card:      rgba(255,255,255,.66);
  --card-line: rgba(11,31,51,.08);
  --hair:      rgba(0,143,214,.16);

  --shadow: 0 24px 60px -28px rgba(11,31,51,.30), 0 4px 14px -6px rgba(11,31,51,.10);

  --ff-display: "Inter", system-ui, sans-serif;
  --ff-body: "Inter", system-ui, sans-serif;

  --pad: clamp(20px, 5vw, 80px);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){ html{ scroll-behavior:auto; } }

body{
  margin:0;
  font-family:var(--ff-body);
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

/* atmosfer canvas tarafından çizilir; gövde sadece düz ton */

/* ---- fly-through canvas (her şeyin arkasında, sabit) ---- */
#field{
  position:fixed; inset:0; z-index:1;
  width:100vw; height:100vh;
  pointer-events:none;
  display:block;
}

main{ position:relative; z-index:3; }

/* ============================ TOP CHROME ============================ */
.topbar{
  position:fixed; top:0; left:0; right:0; z-index:40;
  display:flex; align-items:center; justify-content:space-between;
  padding:18px var(--pad);
  pointer-events:none;
}
.topbar .brand, .topbar .meta{ pointer-events:auto; }
.brand{
  display:flex; align-items:center; gap:11px;
  font-family:var(--ff-display); font-weight:700;
  letter-spacing:.14em; font-size:14px; text-transform:uppercase;
  color:var(--ink);
}
.brand .mark{
  width:30px; height:30px; border-radius:8px;
  display:grid; place-items:center;
  background:linear-gradient(135deg,var(--accent),var(--accent-deep));
  color:#fff; font-size:15px; box-shadow:0 6px 16px -6px var(--accent);
}
.brand .mark svg{ width:17px; height:17px; }
.topbar .meta{
  font-family:var(--ff-display); font-size:11px; letter-spacing:.22em;
  text-transform:uppercase; color:var(--ink-faint);
}

/* scroll progress */
.progress{
  position:fixed; top:0; left:0; height:2px; z-index:50;
  width:0%;
  background:linear-gradient(90deg,var(--accent-deep),var(--accent-bright));
  box-shadow:0 0 12px var(--accent-bright);
}

/* ============================ HERO ============================ */
.hero{
  min-height:100vh;
  display:flex; flex-direction:column; justify-content:center;
  padding:0 var(--pad);
  position:relative;
}
.hero-inner{ max-width:1080px; }
.eyebrow{
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--ff-display); font-size:12px; letter-spacing:.34em;
  text-transform:uppercase; color:var(--accent-deep);
  margin-bottom:30px;
}
.eyebrow::before{
  content:""; width:38px; height:1px; background:var(--accent);
  display:inline-block;
}
.hero h1{
  font-family:var(--ff-display); font-weight:600;
  font-size:clamp(40px, 7.4vw, 104px);
  line-height:.98; letter-spacing:-.02em;
  margin:0 0 28px; max-width:16ch;
  text-wrap:balance;
}
.hero h1 .lite{ color:var(--ink-soft); }
.hero h1 em{ font-style:normal; color:var(--accent-deep); }
.hero p.lede{
  font-size:clamp(17px, 1.6vw, 21px);
  line-height:1.6; color:var(--ink-soft);
  max-width:54ch; margin:0; text-wrap:pretty;
}
.scroll-cue{
  position:absolute; bottom:34px; left:var(--pad);
  display:flex; align-items:center; gap:14px;
  font-family:var(--ff-display); font-size:12px; letter-spacing:.22em;
  text-transform:uppercase; color:var(--ink-faint);
}
.scroll-cue .rail{
  width:30px; height:48px; border-radius:16px;
  border:1.5px solid var(--hair); position:relative;
}
.scroll-cue .rail::after{
  content:""; position:absolute; left:50%; top:9px;
  width:4px; height:9px; border-radius:3px; margin-left:-2px;
  background:var(--accent);
  animation:cue 1.8s ease-in-out infinite;
}
@keyframes cue{ 0%{opacity:0;transform:translateY(0)} 30%{opacity:1} 70%{opacity:1} 100%{opacity:0;transform:translateY(20px)} }
@media (prefers-reduced-motion: reduce){ .scroll-cue .rail::after{ animation:none; } }

/* ============================ ERA SECTIONS ============================ */
.era{
  min-height:100vh;
  display:flex; align-items:center;
  padding:14vh var(--pad);
  position:relative;
}
.era-grid{
  width:100%; max-width:1240px; margin:0 auto;
  display:grid; grid-template-columns:1fr 1fr; align-items:center;
  gap:clamp(24px,5vw,80px);
}
/* ghost year */
.ghost{
  font-family:var(--ff-display); font-weight:700;
  font-size:clamp(120px, 24vw, 360px); line-height:.8;
  letter-spacing:-.04em;
  color:transparent;
  -webkit-text-stroke:2px rgba(0,97,168,.45);
  margin:0;
  will-change:transform;
  user-select:none;
}
.era:nth-child(even) .era-grid{ direction:rtl; }
.era:nth-child(even) .era-grid > *{ direction:ltr; }

.card{
  background:var(--card);
  backdrop-filter:blur(14px) saturate(1.2);
  -webkit-backdrop-filter:blur(14px) saturate(1.2);
  border:1px solid var(--card-line);
  border-radius:22px;
  padding:clamp(26px,3vw,42px);
  box-shadow:var(--shadow);
  max-width:520px;
  position:relative;
  overflow:hidden;
}
.era:nth-child(even) .card{ margin-left:auto; }
.card::before{
  content:""; position:absolute; left:0; top:0; bottom:0; width:3px;
  background:linear-gradient(var(--accent-bright),var(--accent-deep));
}
.card .ico{
  width:46px; height:46px; border-radius:12px;
  display:grid; place-items:center; margin-bottom:22px;
  background:linear-gradient(135deg, rgba(0,143,214,.14), rgba(0,143,214,.05));
  border:1px solid var(--hair);
  color:var(--accent-deep);
}
.card .ico svg{ width:24px; height:24px; }
.card .step{
  font-family:var(--ff-display); font-size:11.5px; letter-spacing:.18em;
  text-transform:uppercase; color:var(--accent-deep);
  display:flex; align-items:center; gap:8px; margin-bottom:14px;
  white-space:nowrap;
}
.card .step .yr{ color:var(--ink); }
.card h2{
  font-family:var(--ff-display); font-weight:600;
  font-size:clamp(26px, 3vw, 40px); line-height:1.05;
  letter-spacing:-.01em; margin:0 0 16px;
}
.card p{
  font-size:clamp(15px,1.15vw,17.5px); line-height:1.65;
  color:var(--ink-soft); margin:0; text-wrap:pretty;
}
.card .tags{
  display:flex; flex-wrap:wrap; gap:8px; margin-top:24px;
}
.card .tags span{
  font-family:var(--ff-display); font-size:11.5px; letter-spacing:.04em;
  padding:6px 12px; border-radius:999px;
  background:rgba(0,143,214,.08); color:var(--accent-deep);
  border:1px solid var(--hair);
}

/* reveal: sisin derinliğinden öne doğru beliriş */
.reveal{ opacity:0; transform:translateY(64px) scale(.88); filter:blur(7px); }
.reveal.in{
  opacity:1; transform:none; filter:blur(0);
  transition:opacity 1.1s cubic-bezier(.16,.8,.24,1), transform 1.1s cubic-bezier(.16,.8,.24,1), filter 1.1s ease;
}
.ghost.reveal{ transform:translateY(40px) scale(.7); filter:blur(10px); }
.ghost.reveal.in{ transform:none; filter:blur(0); }
@media (prefers-reduced-motion: reduce){
  .reveal{ opacity:1 !important; transform:none !important; filter:none !important; }
}

/* ============================ YEAR RAIL NAV ============================ */
.rail-nav{
  position:fixed; right:24px; top:50%; transform:translateY(-50%);
  z-index:30; display:flex; flex-direction:column; gap:2px;
  pointer-events:auto;
}
.rail-nav button{
  appearance:none; border:0; background:none; cursor:pointer;
  display:flex; align-items:center; gap:12px; justify-content:flex-end;
  padding:7px 0; color:var(--ink-faint);
  font-family:var(--ff-display); font-size:11px; letter-spacing:.1em;
}
.rail-nav .lbl{
  opacity:0; transform:translateX(8px);
  transition:.3s; white-space:nowrap;
}
.rail-nav button:hover .lbl, .rail-nav button.active .lbl{ opacity:1; transform:none; }
.rail-nav .dot{
  width:9px; height:9px; border-radius:50%;
  border:1.5px solid var(--ink-faint); background:transparent;
  transition:.3s; flex:none;
}
.rail-nav button.active{ color:var(--accent-deep); }
.rail-nav button.active .dot{
  background:var(--accent); border-color:var(--accent);
  box-shadow:0 0 0 4px rgba(0,143,214,.16);
}
@media (max-width: 860px){ .rail-nav{ display:none; } }

/* ============================ CONTACT ============================ */
.contact{
  min-height:100vh; display:flex; align-items:center;
  padding:14vh var(--pad);
}
.contact-inner{
  width:100%; max-width:1080px; margin:0 auto;
}
.contact .eyebrow{ color:var(--accent-deep); }
.contact h2{
  font-family:var(--ff-display); font-weight:600;
  font-size:clamp(34px,5.4vw,76px); line-height:1; letter-spacing:-.02em;
  margin:0 0 24px; max-width:18ch; text-wrap:balance;
}
.contact p.lede{
  font-size:clamp(16px,1.4vw,20px); color:var(--ink-soft);
  max-width:52ch; line-height:1.6; margin:0 0 44px; text-wrap:pretty;
}
.contact-cards{
  display:grid; grid-template-columns:repeat(3,1fr); gap:16px; margin-bottom:40px;
}
.ccard{
  background:var(--card); backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border:1px solid var(--card-line); border-radius:18px;
  padding:26px; box-shadow:var(--shadow);
}
.ccard .k{
  font-family:var(--ff-display); font-size:11px; letter-spacing:.24em;
  text-transform:uppercase; color:var(--ink-faint); margin-bottom:12px;
}
.ccard .v{ font-size:17px; font-weight:600; color:var(--ink); line-height:1.4; }
.ccard .v.placeholder{ color:var(--ink-faint); font-weight:500; }
.btn{
  display:inline-flex; align-items:center; gap:12px;
  font-family:var(--ff-display); font-weight:600; font-size:16px;
  padding:17px 30px; border-radius:14px; border:0; cursor:pointer;
  color:#fff; text-decoration:none;
  background:linear-gradient(135deg,var(--accent),var(--accent-deep));
  box-shadow:0 18px 40px -16px var(--accent);
  transition:transform .25s, box-shadow .25s;
}
.btn:hover{ transform:translateY(-2px); box-shadow:0 24px 50px -16px var(--accent); }
.btn svg{ width:18px; height:18px; }

/* stats row above contact (özet rakamlar) */
.stats{
  display:grid; grid-template-columns:repeat(4,1fr); gap:16px;
  margin:48px auto 0; max-width:1080px; width:100%;
}
.stat .n{
  font-family:var(--ff-display); font-weight:600;
  font-size:clamp(32px,4vw,56px); letter-spacing:-.02em; color:var(--accent-deep);
  line-height:1;
}
.stat .l{ font-size:13.5px; color:var(--ink-soft); margin-top:8px; }

footer{
  padding:30px var(--pad); text-align:center;
  font-size:13px; color:var(--ink-faint);
  border-top:1px solid var(--card-line);
  position:relative; z-index:3;
  font-family:var(--ff-display); letter-spacing:.04em;
}

/* ============================ RESPONSIVE ============================ */
@media (max-width: 860px){
  .era-grid{ grid-template-columns:1fr; gap:0; }
  .era:nth-child(even) .era-grid{ direction:ltr; }
  .ghost{ position:absolute; top:8vh; left:var(--pad); opacity:.5; }
  .era{ padding:18vh var(--pad); }
  .era:nth-child(even) .card{ margin-left:0; }
  .contact-cards{ grid-template-columns:1fr; }
  .stats{ grid-template-columns:repeat(2,1fr); }
}