/* ===========================================================
   En İyi Su Arıtıcısı — Ortak Stil Dosyası
   Estetik: berraklık / su — derin teal + canlı aqua + sıcak kâğıt
   =========================================================== */

:root{
  --ink:#0b2b2e;
  --deep:#0e3d3a;
  --aqua:#159c8e;
  --aqua-bright:#2fd6c0;
  --paper:#f6f3ec;
  --paper-2:#efe9dd;
  --card:#ffffff;
  --coral:#ff6a45;
  --coral-deep:#e85531;
  --ink-soft:#3c5d5a;
  --muted:#6b8482;
  --line:rgba(11,43,46,.12);
  --line-strong:rgba(11,43,46,.22);
  --shadow:0 1px 2px rgba(11,43,46,.06), 0 18px 40px -22px rgba(11,43,46,.35);
  --shadow-lg:0 30px 70px -30px rgba(11,43,46,.45);
  --radius:18px;
  --radius-sm:12px;
  --maxw:1140px;
  --display:"Fraunces", Georgia, "Times New Roman", serif;
  --body:"Hanken Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--body);
  color:var(--ink);
  background:var(--paper);
  line-height:1.6;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

/* atmospheric background: subtle aqua mesh + grain */
body::before{
  content:"";
  position:fixed; inset:0; z-index:-2;
  background:
    radial-gradient(60% 50% at 85% -5%, rgba(47,214,192,.18), transparent 60%),
    radial-gradient(55% 45% at -10% 15%, rgba(21,156,142,.14), transparent 60%),
    radial-gradient(70% 60% at 50% 120%, rgba(14,61,58,.10), transparent 60%);
  pointer-events:none;
}
body::after{
  content:"";
  position:fixed; inset:0; z-index:-1; opacity:.035; pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- Typography ---------- */
h1,h2,h3,h4{font-family:var(--display);font-weight:560;line-height:1.07;letter-spacing:-.015em;color:var(--ink)}
h1{font-size:clamp(2.5rem,6.5vw,4.6rem);font-optical-sizing:auto}
h2{font-size:clamp(1.9rem,4vw,3rem)}
h3{font-size:clamp(1.25rem,2.2vw,1.6rem)}
.eyebrow{
  font-family:var(--body);font-weight:700;font-size:.78rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--aqua);display:inline-flex;align-items:center;gap:.5rem;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--aqua);display:inline-block;border-radius:2px}
.lead{font-size:clamp(1.05rem,1.7vw,1.32rem);color:var(--ink-soft);max-width:60ch}
.muted{color:var(--muted)}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  backdrop-filter:saturate(140%) blur(12px);
  background:rgba(246,243,236,.78);
  border-bottom:1px solid var(--line);
}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:.6rem;font-family:var(--display);font-size:1.2rem;font-weight:600}
.brand .drop{
  width:30px;height:30px;flex:none;border-radius:50% 50% 50% 8px;transform:rotate(45deg);
  background:linear-gradient(150deg,var(--aqua-bright),var(--aqua) 60%,var(--deep));
  box-shadow:inset 0 0 0 2px rgba(255,255,255,.35), 0 6px 14px -6px var(--aqua);
}
.nav{display:flex;align-items:center;gap:1.6rem}
.nav a{font-size:.96rem;font-weight:500;color:var(--ink-soft);transition:color .2s}
.nav a:hover{color:var(--ink)}
.nav-cta{display:inline-flex}

/* ---------- Buttons ---------- */
.btn{
  --bg:var(--coral);--fg:#fff;
  display:inline-flex;align-items:center;gap:.6rem;
  background:var(--bg);color:var(--fg);
  font-family:var(--body);font-weight:650;font-size:1rem;
  padding:.85rem 1.5rem;border:none;border-radius:999px;cursor:pointer;
  box-shadow:0 12px 26px -12px var(--coral);
  transition:transform .18s ease, box-shadow .18s ease, background .2s;
}
.btn:hover{transform:translateY(-2px);box-shadow:0 18px 34px -12px var(--coral)}
.btn:active{transform:translateY(0)}
.btn.ghost{--bg:transparent;--fg:var(--ink);border:1.5px solid var(--line-strong);box-shadow:none}
.btn.ghost:hover{border-color:var(--ink);background:rgba(11,43,46,.04)}
.btn.aqua{--bg:var(--deep);--fg:#fff;box-shadow:0 12px 26px -14px var(--deep)}
.btn.aqua:hover{box-shadow:0 18px 34px -14px var(--deep)}
.btn .arrow{transition:transform .2s}
.btn:hover .arrow{transform:translateX(3px)}

/* ---------- Hero ---------- */
.hero{position:relative;padding:84px 0 72px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.hero h1{margin:.6rem 0 1.1rem}
.hero h1 em{font-style:italic;color:var(--aqua);font-weight:500}
.hero .lead{margin-bottom:1.9rem}
.hero-actions{display:flex;gap:.9rem;flex-wrap:wrap;align-items:center}
.hero-note{font-size:.9rem;color:var(--muted);margin-top:1.3rem;display:flex;gap:.5rem;align-items:center}
.hero-note b{color:var(--ink)}

/* hero visual: layered glass + ripples */
.hero-visual{position:relative;aspect-ratio:1/1.05;border-radius:26px;overflow:hidden;
  background:linear-gradient(165deg,#0e3d3a,#0b2b2e 70%);box-shadow:var(--shadow-lg)}
.hero-visual .ripple{position:absolute;border:1.5px solid rgba(47,214,192,.35);border-radius:50%;
  left:50%;top:46%;transform:translate(-50%,-50%);animation:ripple 4.5s ease-out infinite}
.hero-visual .ripple:nth-child(2){animation-delay:1.5s}
.hero-visual .ripple:nth-child(3){animation-delay:3s}
@keyframes ripple{0%{width:40px;height:40px;opacity:.8}100%{width:520px;height:520px;opacity:0}}
.hero-visual .core{position:absolute;left:50%;top:46%;transform:translate(-50%,-50%);
  width:128px;height:128px;border-radius:50% 50% 50% 14px;rotate:45deg;
  background:radial-gradient(circle at 35% 30%,var(--aqua-bright),var(--aqua) 55%,var(--deep));
  box-shadow:inset 0 0 30px rgba(255,255,255,.25),0 20px 50px -10px rgba(47,214,192,.5)}
.hero-visual .stat{position:absolute;background:rgba(246,243,236,.94);border-radius:14px;padding:.7rem .95rem;
  box-shadow:var(--shadow);font-size:.84rem;line-height:1.25}
.hero-visual .stat b{font-family:var(--display);font-size:1.35rem;display:block;color:var(--deep)}
.hero-visual .stat.a{left:24px;top:30px}
.hero-visual .stat.b{right:24px;bottom:30px}

/* ---------- Sections ---------- */
section{padding:72px 0}
.section-head{max-width:46rem;margin-bottom:44px}
.section-head h2{margin:.7rem 0 .8rem}

/* feature cards */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 26px;box-shadow:var(--shadow);transition:transform .22s ease,box-shadow .22s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.card .ic{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;margin-bottom:16px;
  background:linear-gradient(150deg,rgba(47,214,192,.18),rgba(21,156,142,.12));color:var(--deep)}
.card .ic svg{width:24px;height:24px}
.card h3{margin-bottom:.5rem}
.card p{color:var(--ink-soft);font-size:.98rem}

/* type comparison rows */
.types{display:grid;gap:14px}
.type-row{display:grid;grid-template-columns:auto 1fr auto;gap:20px;align-items:center;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px 26px;
  box-shadow:var(--shadow);transition:border-color .2s}
.type-row:hover{border-color:var(--aqua)}
.type-row .badge{font-family:var(--display);font-size:1.5rem;color:var(--aqua);min-width:2.4rem}
.type-row h3{font-size:1.2rem;margin-bottom:.2rem}
.type-row p{color:var(--ink-soft);font-size:.95rem}
.type-row .tag{font-size:.78rem;font-weight:650;color:var(--deep);background:var(--paper-2);
  padding:.35rem .7rem;border-radius:999px;white-space:nowrap}

/* steps how-to */
.steps{counter-reset:s;display:grid;gap:18px}
.step{display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:start}
.step .n{counter-increment:s;font-family:var(--display);font-size:1.6rem;color:#fff;
  width:46px;height:46px;border-radius:50%;display:grid;place-items:center;flex:none;
  background:linear-gradient(150deg,var(--aqua),var(--deep))}
.step .n::before{content:counter(s)}
.step h3{font-size:1.18rem;margin-bottom:.25rem}
.step p{color:var(--ink-soft);font-size:.97rem}

/* big CTA band */
.cta-band{position:relative;border-radius:28px;overflow:hidden;padding:56px;color:#fff;
  background:linear-gradient(150deg,#0e3d3a,#0b2b2e);box-shadow:var(--shadow-lg)}
.cta-band::after{content:"";position:absolute;inset:0;opacity:.5;
  background:radial-gradient(40% 80% at 90% 10%,rgba(47,214,192,.5),transparent 60%)}
.cta-band .inner{position:relative;z-index:2;max-width:40rem}
.cta-band h2{color:#fff;margin-bottom:.8rem}
.cta-band p{color:rgba(255,255,255,.82);margin-bottom:1.6rem;font-size:1.08rem}

/* FAQ */
.faq{display:grid;gap:12px;max-width:50rem}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:4px 22px;box-shadow:var(--shadow);transition:border-color .2s}
.faq details[open]{border-color:var(--aqua)}
.faq summary{cursor:pointer;list-style:none;font-weight:600;font-size:1.05rem;padding:16px 0;
  display:flex;justify-content:space-between;align-items:center;gap:1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--display);font-size:1.5rem;color:var(--aqua);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq p{color:var(--ink-soft);padding:0 0 18px;font-size:.98rem}

/* ---------- Footer ---------- */
.site-footer{background:var(--deep);color:rgba(255,255,255,.78);padding:56px 0 30px;margin-top:40px}
.site-footer .wrap{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:30px}
.site-footer h4{color:#fff;font-family:var(--body);font-weight:700;font-size:.82rem;letter-spacing:.12em;
  text-transform:uppercase;margin-bottom:1rem}
.site-footer a{display:block;color:rgba(255,255,255,.72);font-size:.95rem;padding:.25rem 0;transition:color .2s}
.site-footer a:hover{color:var(--aqua-bright)}
.site-footer .brand{color:#fff;margin-bottom:.8rem}
.site-footer .copy{grid-column:1/-1;border-top:1px solid rgba(255,255,255,.14);margin-top:24px;padding-top:22px;
  font-size:.85rem;color:rgba(255,255,255,.55);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* reveal on load */
.reveal{opacity:0;transform:translateY(18px);animation:reveal .8s cubic-bezier(.2,.7,.3,1) forwards}
@keyframes reveal{to{opacity:1;transform:none}}
.d1{animation-delay:.06s}.d2{animation-delay:.14s}.d3{animation-delay:.22s}.d4{animation-delay:.3s}

/* ---------- Responsive ---------- */
@media(max-width:920px){
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-visual{max-width:440px}
  .grid-3{grid-template-columns:1fr 1fr}
  .nav .nav-link{display:none}
  .site-footer .wrap{grid-template-columns:1fr 1fr}
}
@media(max-width:620px){
  body{font-size:16px}
  section{padding:52px 0}
  .hero{padding:54px 0 40px}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .type-row{grid-template-columns:auto 1fr;}
  .type-row .tag{grid-column:1/-1}
  .cta-band{padding:36px 26px}
  .site-footer .wrap{grid-template-columns:1fr}
  .nav{gap:.8rem}
}