/* shared/calc.css — CasioCalculator.Online */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#f6f5f1;--card:#ffffff;--ink:#15151a;--ink2:#3a3a44;--muted:#73737f;--line:#e7e5df;
  --brand:#1b1b1f;--accent:#5b6cff;--accent2:#11c2a7;--accent3:#ff8a5b;--violet:#b06bff;
  --r:22px;--content:980px;
}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden;position:relative}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(620px 420px at 78% -8%,rgba(176,107,255,.22),transparent 60%),
   radial-gradient(560px 440px at 12% 6%,rgba(17,194,167,.20),transparent 60%),
   radial-gradient(700px 520px at 60% 110%,rgba(91,108,255,.16),transparent 60%)}
.shell{max-width:var(--content);margin:0 auto;padding:0 22px}
a{color:inherit;text-decoration:none}
h1,h2,h3{line-height:1.1;letter-spacing:-.03em;font-weight:800}

/* ── NAV ── */
header.nav{
  position:sticky;top:0;z-index:200;
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  background:rgba(246,245,241,.94);border-bottom:1px solid rgba(0,0,0,.07)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:64px;gap:8px;padding:0 22px;max-width:var(--content);margin:0 auto}

/* brand */
.brand{display:flex;align-items:center;gap:8px;font-weight:900;font-size:15px;
  letter-spacing:-.02em;white-space:nowrap;flex-shrink:0;color:var(--ink);text-decoration:none}
.logo{width:30px;height:30px;border-radius:9px;display:grid;place-items:center;
  background:var(--brand);color:#fff;font-weight:900;font-size:16px;flex-shrink:0}
.brand-text{color:var(--ink)}
.brand .tld{color:var(--accent)}

/* desktop nav list */
.nav-links{display:flex;gap:2px;align-items:center;list-style:none}
.nav-links>li{position:relative}
.nav-links>li>a,
.nav-links>li>button{
  display:flex;align-items:center;gap:5px;
  color:var(--ink2);font-weight:600;font-size:13.5px;
  padding:7px 10px;border-radius:10px;border:0;background:none;
  cursor:pointer;transition:background .15s,color .15s;white-space:nowrap}
.nav-links>li>a:hover,
.nav-links>li>button:hover,
.nav-links>li.open>button{background:rgba(0,0,0,.05);color:var(--ink)}
.nav-links>li>button .chev{font-size:10px;opacity:.5;transition:transform .2s}
.nav-links>li.open>button .chev{transform:rotate(180deg)}

/* dropdown */
.drop{
  display:none;position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%);
  background:var(--card);border:1px solid var(--line);border-radius:18px;
  box-shadow:0 20px 60px -10px rgba(0,0,0,.18),0 4px 16px rgba(0,0,0,.07);
  padding:12px;min-width:200px;z-index:300}
.drop.wide{min-width:460px;display:none;grid-template-columns:1fr 1fr;gap:4px}
.nav-links>li.open>.drop{display:block}
.nav-links>li.open>.drop.wide{display:grid}
.drop-item{display:flex;align-items:center;gap:10px;padding:9px 11px;border-radius:11px;
  color:var(--ink2);font-size:13.5px;font-weight:600;
  transition:background .15s,color .15s;white-space:nowrap;text-decoration:none}
.drop-item:hover{background:var(--bg);color:var(--ink)}
.drop-item .di{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;font-size:15px;
  flex-shrink:0;background:linear-gradient(135deg,rgba(91,108,255,.12),rgba(176,107,255,.12))}
.drop-item .dt{display:flex;flex-direction:column;gap:1px}
.drop-item .dt span{font-size:13px;font-weight:700;color:var(--ink);line-height:1.2}
.drop-item .dt small{font-size:11px;color:var(--muted);font-weight:500}
.drop-head{font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.1em;
  color:var(--muted);padding:5px 11px 4px;grid-column:1/-1}

/* burger */
.burger{
  display:none;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:10px;flex-shrink:0;
  background:none;border:1.5px solid var(--line);color:var(--ink);
  font-size:17px;cursor:pointer;transition:background .15s,border-color .15s;
  -webkit-tap-highlight-color:transparent}
.burger:hover{background:rgba(0,0,0,.04);border-color:rgba(0,0,0,.15)}

/* mobile drawer */
.mob-drawer{
  display:none;position:fixed;left:0;right:0;top:64px;bottom:0;
  z-index:199;background:var(--card);overflow-y:auto;
  border-top:1px solid var(--line)}
.mob-drawer.open{display:block}
.mob-drawer-inner{padding:8px 16px 40px}
.mob-cat{margin-bottom:2px}
.mob-cat-head{
  display:flex;align-items:center;gap:8px;
  font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.1em;
  color:var(--muted);padding:16px 2px 8px;
  border-top:1px solid var(--line)}
.mob-cat:first-child .mob-cat-head{border-top:none;padding-top:12px}
.mob-cat-head span{font-size:14px}
.mob-items{display:grid;grid-template-columns:1fr 1fr;gap:7px;padding-bottom:6px}
.mob-item{
  display:flex;align-items:center;gap:9px;
  padding:10px 11px;border-radius:12px;
  border:1px solid var(--line);background:#fbfbfa;
  color:var(--ink2);font-size:13.5px;font-weight:600;
  text-decoration:none;-webkit-tap-highlight-color:transparent;
  transition:background .12s,border-color .12s,color .12s}
.mob-item:active,.mob-item:hover{
  background:rgba(91,108,255,.06);border-color:rgba(91,108,255,.3);color:var(--ink)}
.mob-item .mi{
  width:28px;height:28px;border-radius:7px;display:grid;place-items:center;
  font-size:14px;flex-shrink:0;
  background:linear-gradient(135deg,rgba(91,108,255,.1),rgba(176,107,255,.1))}

/* ── PAGE ELEMENTS ── */
.hero{padding:60px 0 22px;text-align:center}
.pill{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--ink2);background:rgba(255,255,255,.7);border:1px solid var(--line);padding:7px 16px;border-radius:999px;box-shadow:0 4px 14px rgba(0,0,0,.04)}
.dot{width:8px;height:8px;border-radius:50%;background:var(--accent2);box-shadow:0 0 0 4px rgba(17,194,167,.18)}
.hero h1{font-size:clamp(32px,5.5vw,58px);margin:20px auto 14px;max-width:18ch;font-weight:850}
.grad{background:linear-gradient(110deg,var(--accent),var(--violet) 55%,var(--accent3));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(15px,1.8vw,19px);color:var(--ink2);max-width:600px;margin:0 auto}
.calc-stage{display:flex;justify-content:center;padding:28px 0 6px}
.calc{width:100%;max-width:480px;background:var(--card);border:1px solid var(--line);border-radius:30px;padding:26px;box-shadow:0 40px 90px -30px rgba(40,30,90,.35),0 6px 20px rgba(0,0,0,.05)}
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;font-weight:700;color:var(--ink2);margin-bottom:7px}
.input-wrap{position:relative}
.input-wrap .pre{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:15px;font-weight:600;pointer-events:none}
.input-wrap .suf{position:absolute;right:14px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:13px;font-weight:600;pointer-events:none}
.input-wrap.has-pre input,.input-wrap.has-pre select{padding-left:30px}
input[type=number],input[type=text],input[type=date],select{width:100%;border:1px solid var(--line);background:#fbfbfa;border-radius:14px;padding:13px 44px 13px 16px;font-size:16px;font-weight:600;color:var(--ink);-webkit-appearance:none;transition:border-color .15s,box-shadow .15s}
select{padding-right:36px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2373737f' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center}
input:focus,select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(91,108,255,.15)}
input::-webkit-outer-spin-button,input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.btn-calc{width:100%;border:0;background:var(--brand);color:#fff;font-weight:800;font-size:16px;padding:15px;border-radius:16px;cursor:pointer;margin-top:6px;transition:transform .12s,box-shadow .2s}
.btn-calc:hover{transform:translateY(-2px);box-shadow:0 14px 30px -10px rgba(0,0,0,.4)}
.btn-calc:active{transform:scale(.98)}
.err{color:#ff6b6b;font-size:13px;font-weight:600;margin-top:8px;min-height:18px;text-align:center}
.result-box{margin-top:20px;display:none}
.result-box.show{display:block;animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.res-main{text-align:center;border:1px solid var(--line);background:#fbfbfa;border-radius:18px;padding:22px;margin-bottom:14px}
.res-main .lab{font-size:13px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.res-main .val{font-size:44px;font-weight:850;font-variant-numeric:tabular-nums;color:var(--accent);line-height:1.1;margin-top:4px;word-break:break-all}
.res-main .sub{font-size:13px;color:var(--muted);margin-top:4px}
.res-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.res-card{border:1px solid var(--line);background:#fbfbfa;border-radius:14px;padding:14px;text-align:center}
.res-card .k{font-size:11.5px;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.06em}
.res-card .v{font-size:17px;font-weight:800;font-variant-numeric:tabular-nums;margin-top:3px;word-break:break-all}
.res-2{grid-template-columns:1fr 1fr}
.res-4{grid-template-columns:repeat(4,1fr)}
section{padding:52px 0}
.sec-head{text-align:center;max-width:640px;margin:0 auto 40px}
.sec-head h2{font-size:clamp(24px,3.4vw,38px);margin-bottom:10px}
.sec-head p{color:var(--ink2);font-size:16px}
.article{max-width:760px;margin:0 auto}
.article h2{font-size:clamp(24px,3.4vw,36px);margin-bottom:16px;text-align:center}
.article h3{font-size:21px;margin:30px 0 9px}
.article p{color:var(--ink2);font-size:16px;margin-bottom:13px}
.article ul{color:var(--ink2);font-size:16px;margin:0 0 14px 22px}
.article li{margin-bottom:6px}
.example{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin:12px 0;font-family:"SF Mono",ui-monospace,Menlo,Consolas,monospace;font-size:14px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.example .q{color:var(--ink);font-weight:700}.example .arrow{color:var(--muted)}.example .a{color:var(--accent2);font-weight:800}
.example .note{flex-basis:100%;font-family:-apple-system,sans-serif;color:var(--muted);font-size:12.5px;margin-top:2px}
.band{background:var(--brand);color:#fff;border-radius:28px;padding:48px;text-align:center;position:relative;overflow:hidden}
.band::after{content:"";position:absolute;inset:0;background:radial-gradient(400px 240px at 20% 0%,rgba(176,107,255,.4),transparent 60%),radial-gradient(400px 240px at 90% 100%,rgba(17,194,167,.35),transparent 60%)}
.band h2,.band p,.band a{position:relative;z-index:1}
.band h2{font-size:clamp(22px,3vw,34px);margin-bottom:10px}
.band p{color:rgba(255,255,255,.78);margin-bottom:22px}
.btn{display:inline-flex;align-items:center;padding:13px 24px;border-radius:999px;font-weight:700;font-size:15px;cursor:pointer;transition:transform .15s}
.btn:hover{transform:translateY(-2px)}.btn-w{background:#fff;color:var(--brand)}
footer{border-top:1px solid var(--line);padding:46px 0 30px;margin-top:16px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1fr;gap:24px}
.foot-grid h4{font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin-bottom:12px}
.foot-grid a{display:block;color:var(--ink2);font-size:14px;padding:4px 0;transition:color .2s}
.foot-grid a:hover{color:var(--ink)}
.foot-bottom{text-align:center;color:var(--muted);font-size:13px;margin-top:30px;padding-top:20px;border-top:1px solid var(--line)}
@media(max-width:860px){
  .nav-links{display:none!important}
  .burger{display:flex}
  .form-row{grid-template-columns:1fr}
  .res-grid,.res-4{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  section{padding:40px 0}}
@media(max-width:520px){
  .res-grid,.res-2,.res-4{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .band{padding:30px 18px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto}}