/* ============================================================
   SADIKLAR · DERİNLİK — denizin katmanlarında ana sayfa
   Tek temalı (denize adanmış), Archivo + Manrope, ana site paleti.
   ============================================================ */
:root{
  --abyss:#020a12; --deep:#062131; --sea:#0a3247; --surf:#12556f;
  --foam:#4ecdc9; --foam2:#8fe9de; --amber:#dda64f; --sand:#f0e9dc;
  --sky1:#eaf4f9; --sky2:#c6e2ef; --sky3:#8fc3da;
  --fd:"Archivo",-apple-system,BlinkMacSystemFont,sans-serif;
  --fb:"Manrope",-apple-system,BlinkMacSystemFont,sans-serif;
  --ease:cubic-bezier(.22,1,.36,1);
  --wrap:1160px; --gut:clamp(1.1rem,4vw,2.6rem);
}
*,*::before,*::after{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{
  font-family:var(--fb);color:#dcebf1;background:var(--abyss);
  font-size:clamp(.96rem,.9rem + .25vw,1.08rem);line-height:1.72;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--foam);color:var(--abyss)}
a:focus-visible,button:focus-visible{outline:2px solid var(--foam);outline-offset:3px;border-radius:6px}
h1,h2,h3{font-family:var(--fd);font-weight:700;line-height:1.05;letter-spacing:-.026em;font-variation-settings:"wdth" 114;color:#fff;text-wrap:balance}
p{text-wrap:pretty}
.wrap{width:min(100% - var(--gut)*2,var(--wrap));margin-inline:auto}

/* ---------- DÜNYA: sabit arka plan katmanları ----------
   DİKKAT: html'e asla background verme — body arka planı köke taşınır,
   verilirse z-index:-1'deki bu katman görünmez olur. */
.world{position:fixed;inset:0;z-index:-1;pointer-events:none}
.bg{position:absolute;inset:0;opacity:0;transition:none;will-change:opacity}
.bg-0{background:linear-gradient(180deg,var(--sky1) 0%,var(--sky2) 52%,var(--sky3) 100%)}
.bg-1{background:linear-gradient(180deg,#1173a0,#12556f 55%,#0d3f56)}
.bg-2{background:linear-gradient(180deg,#0c3c53,var(--sea) 50%,#083041)}
.bg-3{background:linear-gradient(180deg,#07293a,var(--deep) 55%,#04141f)}
.bg-4{background:linear-gradient(180deg,#031019,var(--abyss) 60%,#010508)}
/* güneş parlaması — yalnız gökyüzünde */
.sun{
  position:absolute;top:6%;right:12%;width:34vmin;height:34vmin;border-radius:50%;
  background:radial-gradient(circle,rgba(255,244,214,.95),rgba(255,236,190,.35) 40%,transparent 70%);
  filter:blur(2px);opacity:0;will-change:opacity;
}
#sea{display:none}
.vignette{position:absolute;inset:0;background:radial-gradient(120% 90% at 50% 40%,transparent 55%,rgba(1,5,10,.5))}

/* ---------- ÜST BAR ---------- */
.top{
  position:fixed;inset:0 0 auto;z-index:80;height:76px;display:flex;align-items:center;
  background:linear-gradient(rgba(2,10,18,.5),transparent);
}
.top .wrap{display:flex;align-items:center;justify-content:space-between;width:min(100% - var(--gut)*2,1400px)}
.top img{height:34px;width:auto;filter:brightness(0) invert(1)}
.top.on-sky img{filter:none}
.top a.back{
  font-size:.82rem;font-weight:700;letter-spacing:.06em;padding:.55rem 1.1rem;border-radius:99px;
  border:1px solid rgba(255,255,255,.35);color:#fff;transition:.3s var(--ease);
}
.top.on-sky a.back{border-color:rgba(7,21,29,.3);color:#07151d}
.top a.back:hover{background:var(--foam);border-color:var(--foam);color:var(--abyss)}

/* ---------- DERİNLİK GÖSTERGESİ ---------- */
.hud{
  position:fixed;right:clamp(.7rem,2.2vw,1.8rem);top:50%;transform:translateY(-50%);z-index:70;
  display:grid;gap:1rem;justify-items:end;text-align:right;
}
.hud__m{
  font-family:var(--fd);font-weight:750;font-size:1.05rem;letter-spacing:.06em;color:#fff;
  font-variant-numeric:tabular-nums;line-height:1.1;
  text-shadow:0 1px 10px rgba(2,10,18,.7);
}
.hud__m small{display:block;font-family:var(--fb);font-size:.56rem;font-weight:800;letter-spacing:.3em;color:var(--foam);opacity:.9}
.hud nav{display:grid;gap:.75rem;justify-items:end;border-right:2px solid rgba(143,233,222,.3);padding-right:.7rem}
.hud nav a{display:flex;align-items:center;gap:.55rem;flex-direction:row;padding:.35rem 0}
.hud nav i{width:9px;height:9px;border-radius:50%;border:1.5px solid rgba(255,255,255,.6);transition:.35s var(--ease);flex:none}
.hud nav span{
  font-size:.66rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:#fff;
  opacity:0;transform:translateX(6px);transition:.35s var(--ease);text-shadow:0 1px 8px rgba(2,10,18,.8);
}
.hud nav a:hover span,.hud nav a:focus-visible span{opacity:1;transform:none}
.hud nav a.on i{background:var(--foam);border-color:var(--foam);box-shadow:0 0 0 4px rgba(78,205,201,.2)}
.hud nav a.on span{opacity:1;transform:none;color:var(--foam2)}
.hud.on-sky .hud__m{color:#07151d;text-shadow:none}
.hud.on-sky .hud__m small{color:#0d5875}
.hud.on-sky nav i{border-color:rgba(7,21,29,.5)}
.hud.on-sky nav span{color:#07151d;text-shadow:none}
@media (max-width:900px){.hud nav{display:none}.hud{top:auto;bottom:1rem;transform:none;pointer-events:none}
.seabed{padding-bottom:4rem}}

/* ---------- SİNEMA PLAKALARI ---------- */
.act--film{position:relative;min-height:100vh;min-height:100svh;display:flex;align-items:center;overflow:hidden}
.act--film>.wrap{position:relative;z-index:2;width:min(100% - var(--gut)*2,var(--wrap))}
.vbg{position:absolute;inset:0;z-index:0}
.vbg video{width:100%;height:100%;object-fit:cover;display:block}
.scrim{position:absolute;inset:0;display:block}
.scrim--mid{background:linear-gradient(100deg,rgba(2,10,18,.72) 0%,rgba(2,10,18,.38) 45%,rgba(2,10,18,.12) 75%),linear-gradient(rgba(2,10,18,.28),rgba(2,10,18,.5))}
.scrim--deep{background:linear-gradient(100deg,rgba(2,10,18,.8) 0%,rgba(2,10,18,.5) 50%,rgba(2,10,18,.25) 80%),linear-gradient(rgba(2,10,18,.35),rgba(2,10,18,.6))}
.scrim--abyss{background:linear-gradient(rgba(2,10,18,.72),rgba(2,10,18,.86)),radial-gradient(70% 60% at 50% 40%,transparent,rgba(1,5,8,.5))}
.act--film h2,.act--film .lead{text-shadow:0 2px 24px rgba(2,10,18,.65)}
@media (prefers-reduced-motion:reduce){.vbg video{display:none}}

/* ---------- SAHNELER ---------- */
.act{position:relative;padding:clamp(5rem,12vh,9rem) 0}
.eyebrow{
  display:inline-flex;align-items:center;gap:.6rem;font-size:.72rem;font-weight:800;
  letter-spacing:.24em;text-transform:uppercase;color:var(--foam);font-variant-numeric:tabular-nums;
}
.eyebrow::before{content:"";width:34px;height:1px;background:currentColor;opacity:.6}
.act h2{font-size:clamp(1.9rem,4.6vw,3.2rem);margin:1rem 0 1.1rem}
.act .lead{font-size:clamp(1.02rem,1vw + .8rem,1.2rem);color:rgba(223,238,244,.88);max-width:56ch}

/* giriş sahnesi (gökyüzü) */
.a0{min-height:100vh;min-height:100svh;display:flex;align-items:center;padding-top:110px;color:#07151d}
.a0 .eyebrow{color:#0d5875}
.a0 h1{color:#07151d;font-size:clamp(2.8rem,8vw,5.6rem);letter-spacing:-.03em;max-width:13ch}
.a0 .lead{color:#274a57;max-width:52ch}
.a0__grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(2rem,5vw,4rem);align-items:center}
.a0__panel{
  border-radius:22px;overflow:hidden;background:#fff;
  box-shadow:0 40px 90px -40px rgba(7,40,60,.55);transform:rotate(1.6deg);
}
.a0__panel img{aspect-ratio:4/3;object-fit:cover;width:100%}
.a0__panel figcaption{padding:.9rem 1.2rem;font-size:.82rem;font-weight:700;color:#274a57;display:flex;justify-content:space-between;gap:1rem}
.a0__panel figcaption span{color:#567078;font-weight:600}
.btn{
  display:inline-flex;align-items:center;gap:.6rem;padding:1rem 1.9rem;border-radius:99px;
  font-size:.95rem;font-weight:800;letter-spacing:.01em;transition:.4s var(--ease);
}
.btn svg{width:16px;height:16px}
.btn-dive{background:#07151d;color:#fff;box-shadow:0 18px 40px -18px rgba(7,21,29,.6)}
.btn-dive:hover{background:var(--surf);transform:translateY(-3px)}
.btn-dive svg{transition:transform .4s var(--ease)}
.btn-dive:hover svg{transform:translateY(3px)}
.btn-ghost{border:1.5px solid rgba(255,255,255,.35);color:#fff}
.btn-ghost:hover{border-color:var(--foam);color:var(--foam2)}
.a0__cta{display:flex;gap:.9rem;flex-wrap:wrap;margin-top:2rem}

/* su hattı */
.waterline{position:relative;height:110px;margin-top:-40px;z-index:2}
.waterline svg{position:absolute;inset:0;width:100%;height:100%}
.waterline path{animation:sway 7s ease-in-out infinite alternate}
.waterline .w2{animation-duration:9s;animation-direction:alternate-reverse}
@keyframes sway{from{transform:translateX(0)}to{transform:translateX(-60px)}}

/* cam kartlar */
.glass{
  background:rgba(4,22,33,.5);border:1px solid rgba(143,233,222,.16);border-radius:20px;
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  padding:clamp(1.3rem,2.5vw,2rem);
}
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(1.6rem,4vw,3.4rem);align-items:center}
.split>*{min-width:0}
.a0__grid>*{min-width:0}
.photo{border-radius:20px;overflow:hidden;background:var(--deep);box-shadow:0 34px 80px -40px rgba(1,8,14,.9)}
.photo img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3}
.photo--tall img{aspect-ratio:3/4}
.note{display:flex;gap:.7rem;align-items:flex-start;margin-top:1.1rem;font-size:.92rem;color:rgba(223,238,244,.8)}
.note svg{width:17px;height:17px;color:var(--foam);flex:none;margin-top:.2rem}

/* şamandıra şeridi */
.buoys{display:flex;gap:clamp(1.4rem,4vw,3rem);margin-top:2.2rem;opacity:.9}
.buoys i{
  width:14px;height:14px;border-radius:50%;background:#fff;flex:none;position:relative;
  box-shadow:0 0 0 3px rgba(255,255,255,.15);animation:bob 3.4s ease-in-out infinite;
}
.buoys i::after{content:"";position:absolute;top:100%;left:50%;width:2px;height:46px;background:linear-gradient(rgba(255,255,255,.4),transparent);transform:translateX(-50%)}
.buoys i:nth-child(2n){animation-delay:-1.2s}.buoys i:nth-child(3n){animation-delay:-2.1s}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(7px)}}

/* tür kartları */
.species{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(1rem,2vw,1.6rem);margin-top:2.4rem}
.sp{
  position:relative;border-radius:20px;overflow:hidden;background:var(--deep);
  border:1px solid rgba(143,233,222,.14);transition:.5s var(--ease);display:block;
}
.sp:hover{transform:translateY(-8px);border-color:rgba(143,233,222,.45);box-shadow:0 30px 70px -30px rgba(1,8,14,.9)}
.sp img{aspect-ratio:4/3;object-fit:cover;width:100%;transition:transform 1s var(--ease)}
.sp:hover img{transform:scale(1.06)}
.sp__b{padding:1.1rem 1.3rem 1.3rem}
.sp__b em{font-style:italic;font-size:.72rem;letter-spacing:.1em;color:var(--foam);text-transform:uppercase}
.sp__b h3{font-size:1.15rem;margin:.3rem 0 .2rem}
.sp__b p{font-size:.85rem;color:rgba(223,238,244,.7)}
.sp__go{
  position:absolute;top:1rem;right:1rem;width:38px;height:38px;border-radius:50%;
  display:grid;place-items:center;background:rgba(2,10,18,.55);border:1px solid rgba(255,255,255,.25);
  opacity:0;transform:scale(.7);transition:.4s var(--ease);
}
.sp:hover .sp__go{opacity:1;transform:none}
.sp__go svg{width:15px;height:15px;stroke:#fff}
.school-note{margin-top:1.6rem;font-size:.9rem;color:rgba(223,238,244,.65);display:flex;align-items:center;gap:.6rem}
.school-note svg{width:22px;height:22px;color:var(--foam);flex:none}

/* salyangoz sahnesi */
.minis{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(.8rem,1.6vw,1.2rem);margin-top:2.2rem}
.mini{border-radius:16px;overflow:hidden;background:var(--deep);border:1px solid rgba(143,233,222,.12);transition:.45s var(--ease);display:block}
.mini:hover{transform:translateY(-6px);border-color:rgba(143,233,222,.4)}
.mini img{aspect-ratio:1;object-fit:cover;width:100%}
.mini b{display:block;padding:.7rem .9rem;font-size:.8rem;font-weight:700;color:#e7f3f6}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1.4rem;margin-top:2.6rem}
.stat{border-top:1px solid rgba(143,233,222,.25);padding-top:1rem}
.stat b{display:block;font-family:var(--fd);font-weight:750;font-size:clamp(1.9rem,3.6vw,2.9rem);color:#fff;letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.stat b small{font-size:.45em;color:var(--foam);margin-left:.15em}
.stat span{font-size:.8rem;color:rgba(223,238,244,.65)}

/* dip sahnesi */
.a4{padding-bottom:clamp(3rem,7vh,5rem)}
.a4 .lead{color:rgba(210,230,238,.8)}
.cta{
  margin-top:2.6rem;border-radius:24px;padding:clamp(1.8rem,4vw,2.8rem);
  background:linear-gradient(140deg,rgba(10,50,71,.75),rgba(6,33,49,.65));
  border:1px solid rgba(143,233,222,.22);
  display:flex;align-items:center;justify-content:space-between;gap:2rem;flex-wrap:wrap;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
}
.cta h3{font-size:clamp(1.4rem,3vw,2rem);max-width:18ch}
.cta p{color:rgba(223,238,244,.75);margin-top:.5rem;font-size:.95rem;max-width:44ch}
.cta__b{display:flex;gap:.8rem;flex-wrap:wrap}
.btn-foam{background:var(--foam);color:var(--abyss)}
.btn-foam:hover{background:var(--foam2);transform:translateY(-3px)}
.glow{color:var(--foam2)}

/* dip / footer */
.seabed{position:relative;padding:clamp(3rem,7vh,5rem) 0 2.2rem;text-align:center}
.seabed::before{
  content:"";position:absolute;inset:auto 0 0;height:140px;pointer-events:none;
  background:radial-gradient(70% 120px at 50% 100%,rgba(20,40,50,.8),transparent);
}
.surface-btn{
  display:inline-flex;flex-direction:column;align-items:center;gap:.6rem;color:var(--foam2);
  font-size:.72rem;font-weight:800;letter-spacing:.26em;text-transform:uppercase;
}
.surface-btn i{
  width:52px;height:52px;border-radius:50%;display:grid;place-items:center;
  border:1.5px solid rgba(143,233,222,.5);transition:.4s var(--ease);
}
.surface-btn:hover i{background:var(--foam);border-color:var(--foam);color:var(--abyss);transform:translateY(-5px)}
.surface-btn svg{width:18px;height:18px}
.seabed p{margin-top:2rem;font-size:.76rem;color:rgba(223,238,244,.6)}
.seabed p a{text-decoration:underline;text-underline-offset:3px}
.seabed a:hover{color:var(--foam2)}

/* görünürlük animasyonu (deterministik süpürme ile açılır) */
.rv{transition:opacity .9s var(--ease),transform .9s var(--ease);transition-delay:var(--d,0s)}
.js .rv{opacity:0;transform:translateY(30px)}
.js .rv.in{opacity:1;transform:none}

@media (max-width:900px){
  .a0__grid,.split{grid-template-columns:1fr}
  .species{grid-template-columns:1fr 1fr}
  .minis{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:1fr}
  .a0__panel{transform:none}
}
@media (max-width:560px){.species{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rays,.caustics,.waterline path,.buoys i{animation:none!important}
  .rv,.js .rv{opacity:1!important;transform:none!important;transition:none!important}
  .btn:hover{transform:none}
}