/* ===== Su Arıtma Hakkında — Bilgi Bankası · shared styles ===== */
:root{
  --paper:#F2EEE4; --paper-2:#E8E1D2; --paper-3:#FBF9F3;
  --ink:#0E1A17; --ink-soft:#33433D; --ink-mute:#5C6A64;
  --teal:#0C6B5B; --teal-bright:#159C84;
  --clay:#B4541A; --clay-soft:#C9742E;
  --line:rgba(14,26,23,0.13); --line-strong:rgba(14,26,23,0.26);
  --shadow:0 24px 60px -32px rgba(14,26,23,0.45);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--paper); color:var(--ink);
  font-family:"Spectral",Georgia,serif; font-size:18px; line-height:1.62;
  -webkit-font-smoothing:antialiased; overflow-x:hidden;
}
body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:9999;opacity:.04;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");}
::selection{background:var(--teal);color:var(--paper)}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.mono{font-family:"JetBrains Mono",monospace}
.display{font-family:"Fraunces",serif}
.wrap{max-width:1180px;margin:0 auto;padding:0 32px}
.col{max-width:760px;margin:0 auto;padding:0 32px}

/* ---------- NAV ---------- */
nav{position:sticky;top:0;z-index:100;background:rgba(242,238,228,.86);backdrop-filter:saturate(140%) blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand-mark{display:flex;align-items:center;gap:11px}
.brand-mark .dot{width:11px;height:11px;border-radius:50%;background:var(--teal-bright);box-shadow:0 0 0 4px rgba(21,156,132,.22)}
.brand-mark b{font-family:"Fraunces";font-weight:600;font-size:18px;letter-spacing:-.01em;line-height:1}
.brand-mark span{font-family:"JetBrains Mono";font-size:9.5px;text-transform:uppercase;letter-spacing:.18em;opacity:.65}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{font-family:"JetBrains Mono";font-size:12px;letter-spacing:.04em;color:var(--ink-soft);transition:color .2s}
.nav-links a:hover{color:var(--teal)}
.nav-cta{padding:9px 17px;border:1px solid var(--ink);border-radius:40px;color:var(--ink)!important}
.nav-cta:hover{background:var(--ink);color:var(--paper)!important}
@media(max-width:860px){.nav-links a:not(.nav-cta){display:none}}

/* ---------- HUB HERO ---------- */
.hub-hero{background:radial-gradient(120% 90% at 85% -20%,#154038 0%,#0E1A17 58%,#0A1512 100%);color:var(--paper);padding:80px 0 90px;position:relative;overflow:hidden}
.hub-hero .grid-lines{position:absolute;inset:0;opacity:.4;pointer-events:none;background-image:linear-gradient(rgba(242,238,228,.05) 1px,transparent 1px);background-size:100% 44px}
.hub-hero .glow{position:absolute;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(21,156,132,.26),transparent 65%);top:-160px;right:-100px}
.kicker{display:inline-flex;align-items:center;gap:9px;font-family:"JetBrains Mono";font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--teal-bright);border:1px solid rgba(21,156,132,.4);border-radius:40px;padding:6px 15px;margin-bottom:26px}
.kicker .pulse{width:7px;height:7px;border-radius:50%;background:var(--teal-bright);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.7)}}
.hub-hero h1{font-family:"Fraunces";font-weight:600;font-size:clamp(36px,6vw,72px);line-height:1.0;letter-spacing:-.025em;max-width:16ch;position:relative}
.hub-hero h1 em{font-style:italic;color:var(--teal-bright)}
.hub-hero p{font-size:clamp(17px,2vw,21px);max-width:56ch;margin-top:24px;color:rgba(242,238,228,.82);font-weight:300;position:relative}
.hub-stats{display:flex;gap:40px;margin-top:48px;flex-wrap:wrap;border-top:1px solid rgba(242,238,228,.15);padding-top:26px;position:relative}
.hub-stats .n{font-family:"Fraunces";font-size:30px;font-weight:600;color:var(--teal-bright);line-height:1}
.hub-stats p{font-family:"JetBrains Mono";font-size:10.5px;letter-spacing:.04em;color:rgba(242,238,228,.6);text-transform:uppercase;margin-top:7px;max-width:24ch}

/* ---------- SUBNAV (category jump) ---------- */
.subnav{position:sticky;top:68px;z-index:90;background:rgba(242,238,228,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.subnav .wrap{display:flex;gap:8px;overflow-x:auto;padding-top:12px;padding-bottom:12px}
.subnav a{font-family:"JetBrains Mono";font-size:11.5px;letter-spacing:.03em;color:var(--ink-soft);white-space:nowrap;padding:7px 14px;border:1px solid var(--line);border-radius:40px;transition:all .2s}
.subnav a:hover{border-color:var(--teal);color:var(--teal)}

/* ---------- CATEGORY BLOCKS ---------- */
.cat{padding:74px 0;border-bottom:1px solid var(--line)}
.cat:nth-child(even){background:var(--paper-2)}
.cat-head{display:flex;align-items:baseline;gap:18px;margin-bottom:8px}
.cat-num{font-family:"JetBrains Mono";font-size:13px;color:var(--clay);letter-spacing:.1em}
.cat-kicker{font-family:"JetBrains Mono";font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--ink-mute)}
.cat h2{font-family:"Fraunces";font-weight:600;font-size:clamp(26px,3.6vw,42px);letter-spacing:-.02em;line-height:1.05;margin-bottom:14px}
.cat h2 em{font-style:italic;color:var(--teal)}
.cat .cat-lead{font-size:18px;color:var(--ink-soft);max-width:62ch;font-weight:300;margin-bottom:38px}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
@media(max-width:880px){.cards{grid-template-columns:repeat(2,1fr)}}
@media(max-width:580px){.cards{grid-template-columns:1fr}}
.acard{background:var(--paper);padding:30px 26px;display:flex;flex-direction:column;gap:12px;transition:background .25s,transform .25s;min-height:230px}
.cat:nth-child(even) .acard{background:var(--paper-3)}
.acard:hover{background:#fff;transform:translateY(-3px)}
.acard .tag{font-family:"JetBrains Mono";font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--clay);display:flex;align-items:center;gap:8px}
.acard .tag.ok{color:var(--teal)}
.acard .tag::before{content:"";width:18px;height:1px;background:currentColor}
.acard h3{font-family:"Fraunces";font-weight:600;font-size:21px;line-height:1.12;letter-spacing:-.01em}
.acard p{font-size:15px;color:var(--ink-soft);line-height:1.5;flex:1}
.acard .read{font-family:"JetBrains Mono";font-size:11px;letter-spacing:.04em;color:var(--teal);margin-top:auto}
.acard:hover .read{text-decoration:underline;text-underline-offset:3px}

/* ---------- ARTICLE ---------- */
.art-hero{padding:64px 0 30px;background:var(--paper)}
.crumbs{font-family:"JetBrains Mono";font-size:11.5px;letter-spacing:.03em;color:var(--ink-mute);margin-bottom:26px}
.crumbs a:hover{color:var(--teal)}
.art-cat{font-family:"JetBrains Mono";font-size:11.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--clay);margin-bottom:16px;display:block}
.art-cat.ok{color:var(--teal)}
h1.art-title{font-family:"Fraunces";font-weight:600;font-size:clamp(32px,5vw,56px);line-height:1.02;letter-spacing:-.025em}
.art-dek{font-size:clamp(19px,2.2vw,23px);color:var(--ink-soft);font-weight:300;margin-top:22px;max-width:42ch}
.art-meta{display:flex;gap:22px;flex-wrap:wrap;margin-top:28px;padding-top:22px;border-top:1px solid var(--line);font-family:"JetBrains Mono";font-size:11.5px;letter-spacing:.03em;color:var(--ink-mute)}
.art-meta b{color:var(--teal);font-weight:500}

/* prose */
.prose{padding:18px 0 40px}
.prose>*{max-width:760px;margin-left:auto;margin-right:auto}
.prose p{margin:22px auto;font-size:19px;line-height:1.72;color:#1a2723}
.prose h2{font-family:"Fraunces";font-weight:600;font-size:clamp(25px,3.2vw,34px);letter-spacing:-.02em;line-height:1.1;margin:54px auto 4px}
.prose h2 .h-num{font-family:"JetBrains Mono";font-size:14px;color:var(--clay);margin-right:12px;font-weight:500}
.prose h3{font-family:"Fraunces";font-weight:600;font-size:21px;letter-spacing:-.01em;margin:34px auto 2px}
.prose ul,.prose ol{margin:18px auto;padding-left:26px}
.prose li{font-size:18px;line-height:1.62;margin:9px 0;color:#1a2723}
.prose li::marker{color:var(--teal)}
.prose strong{font-weight:600}
.prose em{font-style:italic}
.lead{font-size:21px!important;color:var(--ink-soft)!important;font-weight:300;line-height:1.6!important}

/* callouts */
.callout{max-width:760px;margin:30px auto;padding:22px 26px;border-radius:0 14px 14px 0;font-size:17px;line-height:1.58}
.callout .lab{font-family:"JetBrains Mono";font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;display:block;margin-bottom:8px;font-weight:500}
.callout.warn{background:rgba(180,84,26,.09);border-left:3px solid var(--clay)}
.callout.warn .lab{color:var(--clay)}
.callout.note{background:rgba(12,107,91,.09);border-left:3px solid var(--teal)}
.callout.note .lab{color:var(--teal)}

/* tables */
.tbl-wrap{max-width:760px;margin:30px auto;overflow-x:auto;border:1px solid var(--line)}
table{border-collapse:collapse;width:100%;font-size:15.5px;background:var(--paper-3)}
thead th{background:var(--ink);color:var(--paper);font-family:"JetBrains Mono";font-size:11px;letter-spacing:.04em;text-transform:uppercase;text-align:left;padding:13px 16px;font-weight:500}
tbody td{padding:13px 16px;border-bottom:1px solid var(--line);vertical-align:top;line-height:1.45;color:#1a2723}
tbody tr:last-child td{border-bottom:none}
tbody tr:nth-child(even){background:rgba(14,26,23,.025)}
td b{font-weight:600}
.pill{font-family:"JetBrains Mono";font-size:10px;letter-spacing:.06em;text-transform:uppercase;padding:4px 9px;border-radius:30px;white-space:nowrap}
.pill.hi{background:rgba(180,84,26,.14);color:var(--clay)}
.pill.mid{background:rgba(201,116,46,.16);color:var(--clay-soft)}
.pill.lo{background:rgba(12,107,91,.13);color:var(--teal)}

/* step list */
.steps{max-width:760px;margin:26px auto;counter-reset:s;list-style:none;padding:0}
.steps li{position:relative;padding:14px 0 14px 52px;border-bottom:1px solid var(--line);font-size:18px;line-height:1.55}
.steps li::before{counter-increment:s;content:counter(s);position:absolute;left:0;top:13px;width:32px;height:32px;border-radius:50%;background:var(--ink);color:var(--paper);font-family:"JetBrains Mono";font-size:13px;display:flex;align-items:center;justify-content:center}

/* brand bridge */
.bridge{max-width:760px;margin:48px auto;background:radial-gradient(110% 130% at 0% 0%,#14403A,#0E1A17);color:var(--paper);border-radius:18px;padding:34px 34px;position:relative;overflow:hidden}
.bridge .glow{position:absolute;width:300px;height:300px;border-radius:50%;background:radial-gradient(circle,rgba(21,156,132,.3),transparent 65%);top:-120px;right:-80px}
.bridge .lab{font-family:"JetBrains Mono";font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--teal-bright);position:relative}
.bridge h3{font-family:"Fraunces";font-weight:600;font-size:24px;letter-spacing:-.01em;margin:10px 0 12px;position:relative}
.bridge p{font-size:16.5px;color:rgba(242,238,228,.82);font-weight:300;max-width:48ch;position:relative;margin-bottom:20px}
.btn{display:inline-flex;align-items:center;gap:9px;font-family:"JetBrains Mono";font-size:12.5px;letter-spacing:.03em;padding:13px 23px;border-radius:44px;transition:transform .25s,box-shadow .25s;position:relative;cursor:pointer}
.btn-primary{background:var(--teal-bright);color:#06140F;font-weight:500}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px -12px rgba(21,156,132,.55)}

/* related */
.related{max-width:760px;margin:0 auto;padding:50px 0 10px;border-top:1px solid var(--line-strong)}
.related .rl{font-family:"JetBrains Mono";font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-mute);margin-bottom:22px}
.rgrid{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line)}
@media(max-width:560px){.rgrid{grid-template-columns:1fr}}
.rgrid a{background:var(--paper-3);padding:22px;transition:background .2s}
.rgrid a:hover{background:#fff}
.rgrid .t{font-family:"JetBrains Mono";font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--clay);display:block;margin-bottom:8px}
.rgrid h4{font-family:"Fraunces";font-weight:600;font-size:18px;letter-spacing:-.01em;line-height:1.15}

/* footer */
footer{background:var(--ink);color:var(--paper);padding:64px 0 34px;margin-top:30px}
.foot-top{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;padding-bottom:38px;border-bottom:1px solid rgba(242,238,228,.14)}
.foot-brand b{font-family:"Fraunces";font-weight:600;font-size:23px;display:block;margin-bottom:10px}
.foot-brand p{color:rgba(242,238,228,.6);font-weight:300;max-width:34ch;font-size:15px}
.foot-cols{display:flex;gap:56px;flex-wrap:wrap}
.foot-cols h5{font-family:"JetBrains Mono";font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--teal-bright);margin-bottom:15px}
.foot-cols a{display:block;color:rgba(242,238,228,.7);font-size:14.5px;margin-bottom:9px;transition:color .2s}
.foot-cols a:hover{color:var(--paper)}
.foot-bottom{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;padding-top:26px;font-family:"JetBrains Mono";font-size:11px;letter-spacing:.03em;color:rgba(242,238,228,.45)}

/* reveal */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s cubic-bezier(.16,1,.3,1),transform .7s cubic-bezier(.16,1,.3,1)}
.reveal.in{opacity:1;transform:none}