/* ═══════════════════════════════════════════════
   BARVES — MARMOFIX MX-100
   Kurumsal tanıtım · scroll-based 3D
   ═══════════════════════════════════════════════ */

:root{
  --bg:        #0b0d10;
  --bg-2:      #101318;
  --panel:     #14181e;
  --line:      #232a33;
  --line-soft: #1a1f26;

  --ink:       #eef1f5;
  --ink-2:     #a4aeba;
  --ink-3:     #6b7684;

  --amber:     #f0a43c;
  --amber-2:   #ffca7a;
  --amber-dim: rgba(240,164,60,.14);
  --marble:    #f6f4ef;

  --font:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --disp:  'Space Grotesk', var(--font);

  --wrap: 1200px;
  --ease: cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{ box-sizing:border-box; }
[hidden]{ display:none !important; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:var(--font); font-size:16px; line-height:1.65;
  -webkit-font-smoothing:antialiased; overflow-x:hidden;
}
body.is-loading{ overflow:hidden; height:100vh; }
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3,h4{ font-family:var(--disp); font-weight:600; line-height:1.06; letter-spacing:-.02em; margin:0; }
p{ margin:0; }
ul,ol{ margin:0; padding:0; list-style:none; }
::selection{ background:var(--amber); color:#12151a; }

.wrap{ width:min(100% - 44px, var(--wrap)); margin-inline:auto; }

/* ─── ortak ufak parçalar ─── */
.chapter{
  font-family:var(--disp); font-size:12px; font-weight:600;
  letter-spacing:.22em; text-transform:uppercase; color:var(--amber);
  margin-bottom:16px;
}
.eyebrow{
  display:inline-flex; align-items:center; gap:10px;
  font-size:12px; letter-spacing:.18em; text-transform:uppercase;
  color:var(--ink-2); margin-bottom:26px;
}
.eyebrow i{ width:26px; height:1px; background:var(--amber); display:block; }

.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:13px 26px; border-radius:2px; border:1px solid var(--amber);
  background:var(--amber); color:#141414;
  font-family:var(--disp); font-size:13px; font-weight:600;
  letter-spacing:.08em; text-transform:uppercase;
  transition:background .25s var(--ease), color .25s var(--ease), transform .25s var(--ease);
  cursor:pointer;
}
.btn:hover{ background:var(--amber-2); border-color:var(--amber-2); transform:translateY(-2px); }
.btn--ghost{ background:transparent; color:var(--amber); }
.btn--ghost:hover{ background:var(--amber-dim); color:var(--amber-2); }
.btn--sm{ padding:9px 18px; font-size:11px; }
.btn--wide{ width:100%; padding:16px; border:none; }

/* ═══════════ PRELOADER ═══════════ */
.preloader{
  position:fixed; inset:0; z-index:200; background:var(--bg);
  display:grid; place-items:center;
  transition:opacity .8s var(--ease), visibility .8s;
}
.preloader.is-done{ opacity:0; visibility:hidden; }
.preloader__inner{ text-align:center; width:260px; }
.preloader__mark{
  width:46px; height:46px; margin:0 auto 18px; border:1px solid var(--amber);
  display:grid; place-items:center; color:var(--amber);
  font-family:var(--disp); font-weight:700; font-size:20px;
}
.preloader__name{
  font-family:var(--disp); letter-spacing:.42em; font-size:13px;
  color:var(--ink-2); margin-bottom:26px; padding-left:.42em;
}
.preloader__bar{ height:1px; background:var(--line); overflow:hidden; }
.preloader__bar span{ display:block; height:100%; width:0; background:var(--amber); transition:width .3s linear; }
.preloader__status{ margin-top:14px; font-size:11px; letter-spacing:.16em; text-transform:uppercase; color:var(--ink-3); }

/* ═══════════ NAV ═══════════ */
.nav{
  position:fixed; top:0; left:0; right:0; z-index:100;
  display:flex; align-items:center; justify-content:space-between; gap:24px;
  padding:18px clamp(20px,4vw,46px);
  transition:background .4s var(--ease), border-color .4s var(--ease), padding .4s var(--ease);
  border-bottom:1px solid transparent;
}
.nav.is-stuck{
  background:rgba(11,13,16,.82); backdrop-filter:blur(14px);
  border-bottom-color:var(--line-soft); padding-block:12px;
}
.nav__brand{ display:flex; align-items:center; gap:11px; }
.nav__mark{
  width:30px; height:30px; flex:none; border:1px solid var(--amber); color:var(--amber);
  display:grid; place-items:center; font-family:var(--disp); font-weight:700; font-size:14px;
}
.nav__brandtext{ font-family:var(--disp); font-weight:600; letter-spacing:.16em; font-size:14px; line-height:1.1; }
.nav__brandtext em{
  display:block; font-style:normal; font-family:var(--font); font-weight:400;
  font-size:9.5px; letter-spacing:.13em; text-transform:uppercase; color:var(--ink-3);
}
.nav__links{ display:flex; gap:30px; margin-left:auto; margin-right:8px; }
.nav__links a{
  font-size:13px; color:var(--ink-2); letter-spacing:.02em; position:relative; padding-block:4px;
  transition:color .25s;
}
.nav__links a::after{
  content:''; position:absolute; left:0; bottom:0; width:0; height:1px; background:var(--amber);
  transition:width .3s var(--ease);
}
.nav__links a:hover{ color:var(--ink); }
.nav__links a:hover::after{ width:100%; }
.nav__burger{ display:none; background:none; border:none; cursor:pointer; padding:8px; }
.nav__burger span{ display:block; width:22px; height:1.5px; background:var(--ink); margin:5px 0; transition:.3s; }

/* ═══════════ 3D STAGE ═══════════ */
.stage{ position:relative; height:900vh; }
.stage__sticky{ position:sticky; top:0; height:100vh; overflow:hidden; background:#05070a; }
#scene{ position:absolute; inset:0; width:100%; height:100%; display:block; }

.stage__vignette{
  position:absolute; inset:0; pointer-events:none;
  background:radial-gradient(ellipse 120% 80% at 50% 45%, transparent 35%, rgba(3,5,8,.62) 100%);
}
.stage__grain{
  position:absolute; inset:-50%; pointer-events:none; opacity:.045; mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:grain 1.1s steps(3) infinite;
}
@keyframes grain{ 0%{transform:translate(0,0)} 33%{transform:translate(-3%,2%)} 66%{transform:translate(2%,-3%)} 100%{transform:translate(0,0)} }

.stage__fallback{
  position:absolute; inset:0; display:grid; place-content:center; text-align:center; padding:24px;
  background:linear-gradient(160deg,#12161c,#080a0d);
}
.stage__fallback h1{ font-size:clamp(40px,9vw,96px); }
.stage__fallback h1 span{ color:var(--amber); }
.stage__fallback p{ color:var(--ink-2); margin-top:16px; }

/* ─── overlay katmanları ─── */
.overlays{ position:absolute; inset:0; pointer-events:none; }
.ov{
  position:absolute; inset:0;
  display:flex; align-items:center;
  padding:0 clamp(22px,6vw,90px);
  opacity:0; visibility:hidden;
  will-change:opacity, transform;
}
/*
 * Metin panelleri her zaman doğrudan 3B sahnenin üzerinde durur; arka plan
 * bazen koyu fabrika içi, bazen parlak beyaz mermer olabileceği için sabit
 * bir kontrast garantisi gerekir. Bu yüzden panel arkasına buzlu-cam bir
 * zemin eklenir — hangi 3B içerik arkada olursa olsun metin okunur kalır.
 */
.ov__inner{
  max-width:480px; pointer-events:auto;
  padding:24px 28px; border-radius:6px;
  background:rgba(7,9,13,.58);
  backdrop-filter:blur(18px) saturate(1.15);
  -webkit-backdrop-filter:blur(18px) saturate(1.15);
  border:1px solid rgba(255,255,255,.045);
  box-shadow:0 24px 60px -24px rgba(0,0,0,.55);
}
.ov h2{ font-size:clamp(30px,4.2vw,58px); margin-bottom:20px; text-shadow:0 2px 18px rgba(0,0,0,.4); }
.ov p{ color:var(--ink-2); font-size:15.5px; max-width:44ch; }
.ov--right{ justify-content:flex-end; text-align:left; }
.ov--left{ justify-content:flex-start; }
.ov--center{ justify-content:center; text-align:center; }
.ov--center .ov__inner{ max-width:640px; }
.ov--center p{ margin-inline:auto; }
.ov--full{ display:block; padding-top:clamp(80px,12vh,130px); }
.ov__inner--top{ max-width:520px; }

/* hero */
.hero__title{ font-size:clamp(56px,11vw,150px); line-height:.88; letter-spacing:-.045em; }
.hero__title span{ color:var(--amber); }
.hero__sub{ margin-top:26px; font-size:16.5px !important; max-width:40ch; }
.hero__meta{ display:flex; gap:38px; margin-top:38px; flex-wrap:wrap; }
.hero__meta div{ display:flex; flex-direction:column; }
.hero__meta strong{ font-family:var(--disp); font-size:24px; color:var(--marble); }
.hero__meta span{ font-size:11px; letter-spacing:.15em; text-transform:uppercase; color:var(--ink-3); }
.ov--hero .ov__inner{
  max-width:620px; padding:0; background:none; border:none; box-shadow:none;
  backdrop-filter:none; -webkit-backdrop-filter:none;
}

.scrollcue{
  position:absolute; left:50%; bottom:34px; transform:translateX(-50%);
  display:flex; align-items:center; gap:12px;
  font-size:10.5px; letter-spacing:.24em; text-transform:uppercase; color:var(--ink-3);
}
.scrollcue span{
  width:1px; height:34px; background:linear-gradient(var(--amber),transparent);
  animation:cue 2s var(--ease) infinite;
}
@keyframes cue{ 0%,100%{transform:scaleY(.35);opacity:.4} 50%{transform:scaleY(1);opacity:1} }

/* listeler / istatistikler */
.ticks{ margin-top:24px; display:grid; gap:11px; }
.ticks li{ position:relative; padding-left:24px; font-size:14px; color:var(--ink-2); }
.ticks li::before{
  content:''; position:absolute; left:0; top:9px; width:9px; height:9px;
  border-left:1px solid var(--amber); border-bottom:1px solid var(--amber);
  transform:rotate(-45deg);
}
.statrow{ display:flex; gap:40px; margin-top:30px; }
.statrow strong{ display:block; font-family:var(--disp); font-size:28px; color:var(--marble); }
.statrow span{ font-size:11px; letter-spacing:.14em; text-transform:uppercase; color:var(--ink-3); }

.gauge{ margin-top:28px; display:grid; gap:14px; }
.gauge__row{ display:grid; grid-template-columns:130px 1fr auto; align-items:center; gap:14px; font-size:12px; }
.gauge__row span{ color:var(--ink-3); letter-spacing:.06em; }
.gauge__row i{ height:2px; background:var(--line); position:relative; display:block; }
.gauge__row i::after{
  content:''; position:absolute; inset:0 auto 0 0; width:calc(var(--v) * 100%);
  background:var(--amber); box-shadow:0 0 12px rgba(240,164,60,.55);
}
.gauge__row b{ font-family:var(--disp); color:var(--marble); font-size:13px; }

/* patlatılmış görünüm kartları */
.callouts{
  position:absolute; right:clamp(22px,5vw,70px); top:50%; transform:translateY(-50%);
  width:min(330px,32vw); display:grid; gap:12px; pointer-events:auto;
}
.callout{
  border:1px solid var(--line); border-left:2px solid var(--amber);
  background:rgba(16,19,24,.72); backdrop-filter:blur(9px);
  padding:13px 16px; opacity:0; transform:translateX(28px);
  transition:opacity .5s var(--ease), transform .5s var(--ease);
}
.callout.on{ opacity:1; transform:none; }
.callout b{ font-family:var(--disp); font-size:10px; color:var(--amber); letter-spacing:.2em; }
.callout h3{ font-size:15px; margin:3px 0 5px; }
.callout p{ font-size:12.5px; line-height:1.5; color:var(--ink-3); }

.final__title{ font-size:clamp(38px,6.4vw,86px) !important; }
.final__cta{ display:flex; gap:14px; justify-content:center; margin-top:34px; flex-wrap:wrap; }

/* ─── bölüm rayı ─── */
.rail{
  position:absolute; left:clamp(16px,3vw,40px); top:50%; transform:translateY(-50%);
  display:flex; gap:16px; align-items:stretch;
  opacity:0; transition:opacity .6s var(--ease);
}
.rail.on{ opacity:1; }
.rail__track{ width:1px; background:var(--line); position:relative; }
.rail__track i{ position:absolute; top:0; left:0; width:100%; height:0; background:var(--amber); }
.rail__list{ display:flex; flex-direction:column; justify-content:space-between; }
.rail__list li{
  display:flex; align-items:center; gap:9px;
  font-size:10px; letter-spacing:.16em; text-transform:uppercase; color:var(--ink-3);
  transition:color .35s var(--ease); line-height:1;
}
.rail__list li span{ width:4px; height:4px; background:var(--line); transition:.35s var(--ease); }
.rail__list li.on{ color:var(--marble); }
.rail__list li.on span{ background:var(--amber); box-shadow:0 0 10px var(--amber); transform:scale(1.6); }

/* ═══════════ KLASİK BÖLÜMLER ═══════════ */
.sec{ position:relative; z-index:2; background:var(--bg); padding:clamp(90px,13vh,150px) 0; }
.sec--intro{ background:linear-gradient(180deg,#05070a 0%, var(--bg) 22%); }
.sec__head{ max-width:640px; margin-bottom:56px; }
.sec__head h2{ font-size:clamp(30px,4.6vw,54px); }
.sec__desc{ color:var(--ink-3); font-size:14.5px; margin-top:18px; }

.lead{ display:grid; grid-template-columns:1fr 1fr; gap:36px; margin-bottom:64px; }
.lead p{ color:var(--ink-2); font-size:16px; }
.lead p:first-child{ color:var(--ink); font-size:19px; line-height:1.55; }

.cards{ display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--line-soft); border:1px solid var(--line-soft); }
.card{ background:var(--bg-2); padding:32px 26px 36px; transition:background .35s var(--ease); }
.card:hover{ background:var(--panel); }
.card__n{ font-family:var(--disp); font-size:11px; letter-spacing:.2em; color:var(--amber); margin-bottom:22px; }
.card h3{ font-size:19px; margin-bottom:10px; }
.card p{ font-size:13.5px; color:var(--ink-3); }

/* adımlar */
.steps{ display:grid; grid-template-columns:repeat(4,1fr); gap:34px; counter-reset:s; }
.steps li{ border-top:1px solid var(--line); padding-top:22px; }
.steps span{
  display:grid; place-items:center; width:34px; height:34px; margin-bottom:20px;
  border:1px solid var(--amber); color:var(--amber);
  font-family:var(--disp); font-size:13px; font-weight:600;
}
.steps h3{ font-size:19px; margin-bottom:10px; }
.steps p{ font-size:13.5px; color:var(--ink-3); }

/* alanlar */
.sec--fields{ background:var(--bg-2); }
.fields{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line-soft); border:1px solid var(--line-soft); }
.field{ background:var(--bg); margin:0; overflow:hidden; transition:background .35s var(--ease); }
.field:hover{ background:var(--panel); }
.field img{
  width:100%; aspect-ratio:4/3; object-fit:cover; display:block;
  filter:grayscale(.28) contrast(1.04) brightness(.86);
  transition:filter .45s var(--ease), transform .7s var(--ease);
}
.field:hover img{ filter:grayscale(0) contrast(1.02) brightness(.98); transform:scale(1.035); }
.field figcaption{ padding:24px 26px 30px; }
.field h3{ font-size:18px; margin-bottom:9px; }
.field p{ font-size:13.5px; color:var(--ink-3); }

/* cta / form */
.sec--cta{ background:linear-gradient(180deg,var(--bg) 0%, #0e1116 100%); }
.cta{ display:grid; grid-template-columns:1fr 1fr; gap:70px; align-items:center; }
.cta h2{ font-size:clamp(30px,4.2vw,52px); margin-bottom:20px; }
.cta p{ color:var(--ink-2); }
.cta__contact{ display:flex; gap:28px; margin-top:30px; flex-wrap:wrap; }
.cta__contact a{ font-family:var(--disp); color:var(--amber); border-bottom:1px solid var(--amber-dim); padding-bottom:3px; transition:border-color .3s; }
.cta__contact a:hover{ border-bottom-color:var(--amber); }

.form{ border:1px solid var(--line); background:var(--bg-2); padding:34px; }
.form__grid{ display:grid; grid-template-columns:1fr 1fr; gap:18px; margin-bottom:18px; }
.form label{ display:block; font-size:11px; letter-spacing:.14em; text-transform:uppercase; color:var(--ink-3); margin-bottom:18px; }
.form input,.form textarea{
  width:100%; margin-top:8px; padding:12px 14px; background:var(--bg); color:var(--ink);
  border:1px solid var(--line); border-radius:2px; font-family:var(--font); font-size:14px;
  letter-spacing:0; text-transform:none; transition:border-color .25s;
}
.form input:focus,.form textarea:focus{ outline:none; border-color:var(--amber); }
.form textarea{ resize:vertical; }
.form__note{ margin-top:16px; font-size:13px; color:var(--amber); text-align:center; }

/* footer */
.foot{ background:#07090c; border-top:1px solid var(--line-soft); padding:64px 0 30px; }
.foot__in{ display:grid; gap:44px; }
.foot__brand{ display:flex; align-items:center; gap:11px; font-family:var(--disp); letter-spacing:.16em; font-size:14px; }
.foot__brand em{ font-style:normal; font-family:var(--font); font-size:10px; letter-spacing:.12em; text-transform:uppercase; color:var(--ink-3); }
.foot__cols{ display:grid; grid-template-columns:repeat(3,minmax(0,220px)); gap:40px; }
.foot__cols h4{ font-size:11px; letter-spacing:.18em; text-transform:uppercase; color:var(--ink-3); margin-bottom:16px; }
.foot__cols a{ display:block; font-size:13.5px; color:var(--ink-2); padding:5px 0; transition:color .25s; }
.foot__cols a:hover{ color:var(--amber); }
.foot__legal{
  display:flex; justify-content:space-between; gap:20px; flex-wrap:wrap;
  border-top:1px solid var(--line-soft); padding-top:24px; font-size:12px; color:var(--ink-3);
}

/* reveal */
.reveal{ opacity:0; transform:translateY(26px); transition:opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.on{ opacity:1; transform:none; }
.cards .reveal:nth-child(2){ transition-delay:.08s }
.cards .reveal:nth-child(3){ transition-delay:.16s }
.cards .reveal:nth-child(4){ transition-delay:.24s }
.steps .reveal:nth-child(2){ transition-delay:.08s }
.steps .reveal:nth-child(3){ transition-delay:.16s }
.steps .reveal:nth-child(4){ transition-delay:.24s }

/* ═══════════ RESPONSIVE ═══════════ */
@media (max-width:1080px){
  .lead{ grid-template-columns:1fr; gap:20px; }
  .cards{ grid-template-columns:1fr 1fr; }
  .steps{ grid-template-columns:1fr 1fr; gap:28px; }
  .fields{ grid-template-columns:1fr 1fr; }
  .cta{ grid-template-columns:1fr; gap:44px; }
  .callouts{ width:min(290px,40vw); }
}
@media (max-width:820px){
  .nav__links{ display:none; }
  .nav__burger{ display:block; }
  .nav.is-open .nav__links{
    display:flex; position:absolute; top:100%; left:0; right:0; flex-direction:column; gap:0;
    background:rgba(11,13,16,.97); backdrop-filter:blur(14px); padding:10px 26px 22px;
    border-bottom:1px solid var(--line-soft);
  }
  .nav.is-open .nav__links a{ padding:13px 0; border-bottom:1px solid var(--line-soft); }
  .rail{ display:none; }
  .stage{ height:760vh; }
  .ov{ align-items:flex-end; padding-bottom:14vh; }
  .ov--right,.ov--left,.ov--center{ justify-content:flex-start; text-align:left; }
  .ov--center p{ margin-inline:0; }
  .ov__inner{ max-width:100%; }
  .ov--hero{ align-items:center; }
  .ov--full{ display:flex; align-items:flex-end; padding-top:0; }
  .ov--full .ov__inner--top{ position:absolute; top:14vh; left:clamp(22px,6vw,90px); right:22px; }
  .callouts{
    position:static; transform:none; width:100%;
    grid-template-columns:1fr 1fr; gap:8px; max-height:44vh; overflow:hidden;
  }
  .callout p{ display:none; }
  .hero__meta{ gap:24px; }
  .statrow{ gap:26px; }
  .cards,.fields{ grid-template-columns:1fr; }
  .steps{ grid-template-columns:1fr; }
  .form__grid{ grid-template-columns:1fr; }
  .foot__cols{ grid-template-columns:1fr 1fr; }
  .gauge__row{ grid-template-columns:104px 1fr auto; gap:10px; }
}
@media (max-width:520px){
  .form{ padding:22px; }
  .callouts{ grid-template-columns:1fr; max-height:36vh; }
}

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  .stage__grain{ animation:none; }
  .scrollcue span{ animation:none; }
  .reveal{ opacity:1; transform:none; transition:none; }
}