/* =============================================================
   tool.css — shared chrome for calculator pages.

   The nine original calculators each carry their own copy of this
   CSS inline. New tools link this file instead, so adding tool #14
   costs a few KB rather than another 15 KB of duplicated styling.
   ============================================================= */

:root{
  --blue:#1b4b91; --blue-dark:#163a6b; --blue-deeper:#0c1e3c; --blue-light:#e7effc;
  --accent:#2c73dd; --accent-2:#5ba0f5;
  --grey-900:#111f36; --grey-700:#3a4757; --grey-500:#67748a;
  --grey-300:#c6d0de; --grey-100:#e9eef6; --grey-50:#f2f5fa;
  --white:#ffffff;
  --green:#0f7d54; --green-bg:#e0f3ea;
  --amber:#9a6a08; --amber-bg:#fbf0d9;
  --red:#b8302a;   --red-bg:#fbe7e5;
  --radius:18px;
  --shadow:0 2px 6px rgba(17,31,54,.05),0 16px 38px -20px rgba(17,31,54,.22);
  --shadow-sm:0 1px 2px rgba(17,31,54,.04),0 3px 10px -4px rgba(17,31,54,.10);
  --maxw:1180px;
}
:root[data-theme="dark"]{
  --blue-light:#17273e;
  --grey-900:#eaf0f9; --grey-700:#b2c0d2; --grey-500:#8492a8;
  --grey-300:#3a4761; --grey-100:#253044; --grey-50:#0a0f18;
  --white:#141c2a;
  --green-bg:#0f2a20; --amber-bg:#2a2113; --red-bg:#2f1917;
  --green:#43c391; --amber:#dcac52; --red:#ea8079;
  --accent:#74b2f5; --accent-2:#8dc2fb;
  --shadow:0 2px 6px rgba(0,0,0,.4),0 16px 38px -20px rgba(0,0,0,.75);
  --shadow-sm:0 1px 2px rgba(0,0,0,.4),0 3px 10px -4px rgba(0,0,0,.55);
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:72px}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,
              "Noto Sans Arabic",sans-serif;
  color:var(--grey-900);background:var(--grey-50);line-height:1.6;min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
[dir="rtl"] body{font-family:"Segoe UI","Noto Sans Arabic",Tahoma,Arial,sans-serif}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.tnum{font-variant-numeric:tabular-nums}
a{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ---------------- nav ---------------- */
nav{
  position:sticky;top:0;z-index:50;color:#fff;
  background:rgba(20,58,112,.97);backdrop-filter:blur(8px);
  box-shadow:0 2px 12px rgba(12,30,60,.25);
}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;padding:0 24px;height:60px;gap:14px;
  display:flex;align-items:center;justify-content:space-between;position:relative;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:16px;
  white-space:nowrap;color:#fff;text-decoration:none}
.brand .logo{width:32px;height:32px;border-radius:9px;background:rgba(255,255,255,.16);
  display:grid;place-items:center;flex-shrink:0}
.nav-links{display:flex;align-items:center;gap:4px;justify-content:flex-end;min-width:0}
.nav-links > a{color:#c9dbf5;text-decoration:none;padding:9px 14px;border-radius:9px;
  font-weight:600;font-size:14.5px;white-space:nowrap}
.nav-links > a:hover{color:#fff;background:rgba(255,255,255,.1)}
.nav-links > a.on{color:#fff;background:rgba(255,255,255,.16)}
.nav-right{display:flex;align-items:center;gap:8px}
.menu-btn,.theme-btn{
  display:grid;place-items:center;border:0;background:rgba(255,255,255,.14);color:#fff;
  width:40px;height:40px;border-radius:9px;cursor:pointer;font-size:16px;
}
.menu-btn{display:none}
.lang-toggle{display:flex;background:rgba(255,255,255,.14);border-radius:999px;padding:3px;
  font-size:13px;font-weight:600;flex-shrink:0}
.lang-toggle button{border:0;background:transparent;color:#dbe6f7;padding:7px 13px;
  border-radius:999px;cursor:pointer;font:inherit;transition:.15s}
.lang-toggle button.active{background:#fff;color:var(--blue)}
@media(max-width:900px){
  .menu-btn{display:grid}
  .nav-links{display:none;position:absolute;top:58px;inset-inline:0;
    background:var(--blue-deeper);flex-direction:column;align-items:stretch;gap:0;
    padding:8px 0;box-shadow:0 12px 24px rgba(0,0,0,.25)}
  .nav-links.open{display:flex}
  .nav-links > a{padding:14px 22px;border-radius:0;width:100%;font-size:15px}
}
@media(max-width:560px){
  .nav-inner{gap:8px;padding:0 16px}
  .brand span:last-child{display:none}
  .menu-btn,.theme-btn{width:36px;height:36px}
  .lang-toggle button{padding:6px 9px;font-size:12px}
}

/* ---------------- sign in button ---------------- */
.nav-auth{
  display:inline-flex;align-items:center;gap:7px;flex:none;white-space:nowrap;
  background:#fff;color:var(--blue);text-decoration:none;
  font-size:13.5px;font-weight:800;padding:9px 16px;border-radius:9px;
  transition:filter .15s;
}
.nav-auth:hover{filter:brightness(.94)}
.nav-auth.ghost{background:rgba(255,255,255,.16);color:#fff}
@media(max-width:560px){
  .nav-auth{padding:8px 12px;font-size:12.5px}
  .nav-auth span{display:none}
}

/* ---------------- account nudge ---------------- */
.gate{
  position:fixed;inset-inline:0;inset-block-end:0;z-index:70;
  padding:0 14px calc(14px + env(safe-area-inset-bottom));
  transform:translateY(120%);transition:transform .22s ease,opacity .22s ease;opacity:0;
  pointer-events:none;
}
.gate.in{transform:none;opacity:1;pointer-events:auto}
.gate.out{transform:translateY(120%);opacity:0}
.gate-in{
  max-width:640px;margin:0 auto;display:flex;align-items:center;gap:15px;
  background:var(--white);border:1px solid var(--grey-100);border-radius:16px;
  padding:15px 18px;box-shadow:0 10px 40px rgba(17,31,54,.22);
}
.gate-ic{
  width:42px;height:42px;border-radius:12px;background:var(--blue-light);
  display:grid;place-items:center;font-size:21px;flex:none;
}
.gate-txt{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}
.gate-txt b{font-size:14.5px;font-weight:800;color:var(--grey-900)}
.gate-txt span{font-size:13px;color:var(--grey-500);line-height:1.45}
.gate-act{display:flex;align-items:center;gap:9px;flex:none}
.gate-go{
  background:linear-gradient(135deg,var(--accent),var(--blue));color:#fff;text-decoration:none;
  font-size:13.5px;font-weight:800;padding:10px 18px;border-radius:10px;white-space:nowrap;
}
.gate-no{
  border:0;background:none;color:var(--grey-500);font:inherit;font-size:13px;
  font-weight:650;cursor:pointer;padding:8px 4px;white-space:nowrap;
}
.gate-no:hover{color:var(--grey-900)}
@media(max-width:620px){
  .gate-in{flex-wrap:wrap;gap:11px}
  .gate-ic{width:36px;height:36px;font-size:18px}
  .gate-txt{flex-basis:calc(100% - 50px)}
  .gate-act{width:100%}
  .gate-go{flex:1;text-align:center}
}

/* ---------------- hero ---------------- */
.hero{
  color:#fff;padding:48px 0 118px;position:relative;overflow:hidden;
  background:
    radial-gradient(760px 340px at 84% 0%, rgba(91,160,245,.26), transparent 62%),
    linear-gradient(154deg,#1d5199 0%,#143a70 52%,var(--blue-deeper) 100%);
}
.hero-inner{position:relative;z-index:1;max-width:var(--maxw);margin:0 auto;
  padding:0 24px;text-align:center}
.hero .badge{
  display:inline-block;background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.22);
  border-radius:999px;padding:6px 16px;font-size:13px;font-weight:600;color:#dbe8fb;margin-bottom:18px;
}
.hero h1{font-size:clamp(26px,4.6vw,40px);font-weight:800;line-height:1.14;
  letter-spacing:-.024em;text-wrap:balance}
.hero .sub{margin:14px auto 0;max-width:56ch;font-size:16px;color:#c2d8f4;line-height:1.6}

/* ---------------- calculator card ---------------- */
.calc-wrap{max-width:860px;margin:-88px auto 0;padding:0 24px;position:relative;z-index:2}
.calc{
  background:var(--white);border:1px solid var(--grey-100);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:26px;
}
.calc h2{font-size:18px;font-weight:800;margin-bottom:4px}
.calc .hint{font-size:13.5px;color:var(--grey-500);margin-bottom:20px}
.frow{display:grid;gap:16px;margin-bottom:16px}
@media(min-width:640px){.frow.two{grid-template-columns:1fr 1fr}}
.f label{display:block;font-size:13px;font-weight:700;color:var(--grey-700);margin-bottom:6px}
.f input,.f select{
  width:100%;padding:13px 15px;border:1.5px solid var(--grey-100);border-radius:12px;
  background:var(--grey-50);font-size:16px;font-family:inherit;color:var(--grey-900);
  transition:border-color .15s,background .15s;
}
.f input:focus,.f select:focus{outline:none;border-color:var(--accent);background:var(--white)}
.f .note{font-size:12px;color:var(--grey-500);margin-top:5px;line-height:1.45}
.seg-row{display:flex;gap:8px;flex-wrap:wrap}
.seg-row button{
  flex:1;min-width:120px;padding:12px 14px;border:1.5px solid var(--grey-100);
  border-radius:12px;background:var(--grey-50);font:inherit;font-size:14.5px;font-weight:650;
  color:var(--grey-700);cursor:pointer;transition:.15s;
}
.seg-row button.on{background:var(--blue-light);border-color:var(--accent);color:var(--blue)}
.go-btn{
  width:100%;margin-top:6px;padding:15px;border:0;border-radius:13px;cursor:pointer;
  background:linear-gradient(135deg,var(--accent),var(--blue));color:#fff;
  font:inherit;font-size:16px;font-weight:800;transition:filter .15s;
}
.go-btn:hover{filter:brightness(1.07)}

/* ---------------- result ---------------- */
.result{margin-top:22px;display:none}
.result.show{display:block;animation:rise .3s ease}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.big-num{
  background:linear-gradient(135deg,var(--blue),var(--blue-deeper));color:#fff;
  border-radius:var(--radius);padding:26px;text-align:center;position:relative;overflow:hidden;
}
.big-num::after{content:"";position:absolute;inset-block-start:-60%;inset-inline-end:-12%;
  width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.10),transparent 66%)}
.big-num .lbl{font-size:12px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;
  color:#a8c8f0;position:relative}
.big-num .v{font-size:clamp(30px,7vw,44px);font-weight:800;letter-spacing:-.028em;
  margin-top:4px;position:relative;line-height:1.05}
.big-num .s{font-size:14px;color:#c2d8f4;margin-top:7px;position:relative}

.rows{margin-top:16px;border:1px solid var(--grey-100);border-radius:var(--radius);
  overflow:hidden;background:var(--white)}
.r{display:flex;justify-content:space-between;align-items:baseline;gap:14px;
  padding:13px 17px;border-bottom:1px solid var(--grey-100);font-size:14.5px}
.r:last-child{border-bottom:0}
.r .k{color:var(--grey-500)}
.r .v{font-weight:750;color:var(--grey-900);text-align:end}
.r.tot{background:var(--grey-50);font-size:16px}
.r.tot .v{color:var(--blue);font-size:18px}
.r.minus .v{color:var(--red)}
.r.plus .v{color:var(--green)}

.bars{margin-top:16px;display:flex;flex-direction:column;gap:11px}
.bar-row .bl{display:flex;justify-content:space-between;font-size:13.5px;margin-bottom:5px}
.bar-row .bl b{color:var(--grey-900)}
.bar-row .bt{height:10px;border-radius:99px;background:var(--grey-100);overflow:hidden}
.bar-row .bt i{display:block;height:100%;border-radius:99px}

.callout{
  margin-top:16px;border-radius:var(--radius);padding:15px 17px;
  display:flex;gap:12px;align-items:flex-start;font-size:14px;line-height:1.55;
}
.callout .ci{font-size:18px;line-height:1.3;flex:none}
.callout.good{background:var(--green-bg);color:var(--green)}
.callout.warn{background:var(--amber-bg);color:var(--amber)}
.callout.info{background:var(--blue-light);color:var(--blue)}
.callout b{font-weight:800}

.disclaimer{margin-top:18px;font-size:12px;color:var(--grey-500);line-height:1.55;
  padding:14px 16px;background:var(--grey-50);border:1px solid var(--grey-100);border-radius:14px}

/* ---------------- prose + FAQ ---------------- */
.section{padding:56px 0}
.prose{max-width:760px;margin:0 auto;background:var(--white);border:1px solid var(--grey-100);
  border-radius:var(--radius);padding:32px;box-shadow:var(--shadow-sm)}
.prose h2{font-size:23px;font-weight:800;margin:0 0 14px;letter-spacing:-.015em}
.prose h3{font-size:17px;font-weight:750;margin:24px 0 8px}
.prose p{margin:0 0 14px;color:var(--grey-700);font-size:15.5px}
.prose ul{margin:0 0 14px;padding-inline-start:22px;color:var(--grey-700)}
.prose li{margin-bottom:7px;font-size:15.5px}
.prose table{width:100%;border-collapse:collapse;margin:0 0 16px;font-size:14.5px}
.prose th,.prose td{padding:10px 13px;border-bottom:1px solid var(--grey-100);text-align:start}
.prose th{background:var(--grey-50);font-weight:750;font-size:12.5px;text-transform:uppercase;
  letter-spacing:.05em;color:var(--grey-500)}
.tblwrap{overflow-x:auto}

.faq{max-width:760px;margin:0 auto}
.faq h2{text-align:center;font-size:24px;font-weight:800;margin-bottom:22px}
.qa-item{background:var(--white);border:1px solid var(--grey-100);border-radius:14px;
  margin-bottom:10px;overflow:hidden}
.qa-item summary{padding:16px 18px;font-weight:700;font-size:15.5px;cursor:pointer;
  list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:center}
.qa-item summary::-webkit-details-marker{display:none}
.qa-item summary::after{content:"+";font-size:19px;color:var(--grey-500);flex:none}
.qa-item[open] summary::after{content:"−"}
.qa-item .a{padding:0 18px 16px;color:var(--grey-700);font-size:15px;line-height:1.62}

.related{max-width:760px;margin:26px auto 0;display:grid;gap:11px;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.related a{
  display:flex;align-items:center;gap:11px;background:var(--white);text-decoration:none;
  border:1px solid var(--grey-100);border-radius:14px;padding:14px 16px;
  box-shadow:var(--shadow-sm);transition:transform .15s,box-shadow .15s;
}
.related a:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.related .ri{width:36px;height:36px;border-radius:10px;background:var(--blue-light);
  display:grid;place-items:center;font-size:17px;flex:none}
.related b{display:block;font-size:14.5px;color:var(--grey-900);font-weight:750}
.related span{font-size:12.5px;color:var(--grey-500)}

/* ---------------- footer ---------------- */
footer{background:var(--blue-deeper);color:#a9c0e2;padding:48px 0 26px;font-size:14px;margin-top:20px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:36px;margin-bottom:36px}
footer h4{color:#fff;font-size:14px;margin-bottom:12px;font-weight:750}
footer ul{list-style:none}
footer li{margin-bottom:8px}
footer a{color:#a9c0e2;text-decoration:none}
footer a:hover{color:#fff}
.f-brand{display:flex;align-items:center;gap:9px;color:#fff;font-weight:800;margin-bottom:10px}
.f-brand .logo{width:30px;height:30px;border-radius:8px;background:rgba(255,255,255,.14);
  display:grid;place-items:center}
.f-bot{border-top:1px solid rgba(255,255,255,.12);padding-top:20px;text-align:center;
  font-size:13px;color:#8fa9cc}
@media(max-width:960px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.footer-grid{grid-template-columns:1fr;gap:26px}}