:root{--bg:#e9f0ef;--card:#fff;--ink:#14262b;--mute:#5b6f74;--line:#cfdcdb;--ac:#0e7c7b;--acink:#fff;--hot:#f2a33a;--hotink:#2a1a00;--key:#f2f6f6;--ok:#0e7c7b;
box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){color-scheme:dark;--bg:#0d1a1d;--card:#142428;--ink:#e6f1f0;--mute:#8fa6aa;--line:#26393d;--ac:#38b2ac;--acink:#04201f;--key:#1b3135;--ok:#5ad1c9}}
:root[data-theme="dark"]{color-scheme:dark;--bg:#0d1a1d;--card:#142428;--ink:#e6f1f0;--mute:#8fa6aa;--line:#26393d;--ac:#38b2ac;--acink:#04201f;--key:#1b3135;--ok:#5ad1c9}
*{box-sizing:border-box}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Noto Sans Devanagari",system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.5}
main{max-width:560px;margin:0 auto;padding:16px 14px 40px}
h1{font-size:1.5rem;font-weight:800;margin:6px 0 2px}
.sub{color:var(--mute);margin:0 0 14px;font-size:.95rem}
nav{display:flex;gap:6px;overflow-x:auto;padding-bottom:8px;margin-bottom:10px}
nav a{text-decoration:none;flex:0 0 auto;border:1.5px solid var(--line);background:var(--card);color:var(--ink);font:inherit;font-weight:600;padding:8px 14px;border-radius:999px;cursor:pointer}
nav a[aria-current="page"]{background:var(--ac);color:var(--acink);border-color:var(--ac)}
button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--hot);outline-offset:2px}
section{display:none;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px}
section.on{display:block}
label{display:block;font-weight:600;font-size:.9rem;margin:10px 0 4px}
input,select{width:100%;font:inherit;padding:10px 12px;border-radius:10px;border:1.5px solid var(--line);background:var(--key);color:var(--ink);min-height:44px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.out{margin-top:14px;padding:14px;border-radius:12px;background:var(--key);border-left:5px solid var(--ok)}
.out b{font-size:1.35rem;display:block;overflow-wrap:anywhere}
.out small{color:var(--mute)}
.note{color:var(--mute);font-size:.82rem;margin:8px 0 0}
.disp{background:var(--key);border-radius:12px;padding:12px 14px;margin-bottom:10px;text-align:right;min-height:84px}
.disp .ex{color:var(--mute);min-height:1.6em;overflow-wrap:anywhere;font-size:1.05rem}
.disp .rs{font-size:2rem;font-weight:800;overflow-wrap:anywhere}
.pad{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}
.pad button{font:inherit;font-weight:600;font-size:1.05rem;min-height:48px;border:0;border-radius:10px;background:var(--key);color:var(--ink);cursor:pointer}
.pad button.f{color:var(--ac)}
.pad button.eq{background:var(--hot);color:var(--hotink)}
.pad button.cl{color:#c0392b}
.mode{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.mode button{font:inherit;font-weight:600;border:1.5px solid var(--line);background:var(--card);color:var(--ink);border-radius:999px;padding:4px 14px;cursor:pointer;min-height:36px}

h2{font-size:1.1rem;margin:22px 0 6px}
.about{margin-top:18px;color:var(--mute)}
.about p{margin:6px 0}
.grid{display:grid;gap:10px}
.grid a{display:block;padding:14px;border:1px solid var(--line);border-radius:14px;background:var(--card);color:inherit;text-decoration:none}
.grid b{color:var(--ac);display:block}
.grid span{color:var(--mute);font-size:.9rem}
footer{margin-top:28px;padding-top:14px;border-top:1px solid var(--line);color:var(--mute);font-size:.88rem}
footer a{color:var(--ac);margin-right:12px}
.page p,.page li{max-width:70ch}
.top{display:flex;justify-content:flex-end;gap:8px;margin-bottom:6px}
.top button,.tools button{font:inherit;font-size:.85rem;border:1.5px solid var(--line);background:var(--card);color:var(--ink);border-radius:999px;padding:6px 12px;cursor:pointer;min-height:36px}
.tools{margin-top:8px;display:flex;gap:8px;flex-wrap:wrap}
.ic{display:inline-grid;place-items:center;width:2.1rem;height:2.1rem;border-radius:10px;background:var(--ac);color:var(--acink);font-size:1.15rem;margin-right:10px;vertical-align:middle}
.hero{background:linear-gradient(135deg,#0e7c7b,#1b4f72);color:#fff;border-radius:20px;padding:22px 18px;margin:4px 0 8px}
.hero h1{margin:0 0 6px;font-size:1.7rem}.hero p{margin:0 0 14px}
.hero input{border:0;color:#14262b;background:#fff}
.cat{font-size:1.05rem;margin:18px 0 8px}
.grid a{display:flex;gap:12px;align-items:center}
.grid a .ic{flex:0 0 auto;margin:0}
.words{margin-top:10px;font-weight:600;color:var(--ac)}
.bar{height:14px;border-radius:99px;background:var(--hot);overflow:hidden;margin-top:10px}
.bar i{display:block;height:100%;background:var(--ac)}
.lg{display:flex;justify-content:space-between;font-size:.85rem;color:var(--mute);margin-top:6px}
.rel{margin-top:22px}
.about ol{margin:6px 0;padding-left:1.3rem}
.seg{display:flex;background:var(--key);border-radius:999px;padding:4px;margin-bottom:8px}
.seg button{flex:1;border:0;background:transparent;color:var(--ink);font:inherit;font-weight:600;padding:8px;border-radius:999px;cursor:pointer;min-height:40px}
.seg button[aria-pressed="true"]{background:var(--ac);color:var(--acink)}
.fld{margin-top:12px}
.fld .hd{display:flex;justify-content:space-between;align-items:center;gap:10px}
.fld .hd label{margin:0}
.fld .hd input{width:9.5rem;text-align:right}
input[type=range]{width:100%;min-height:28px;padding:0;accent-color:var(--ac)}
.dn{display:flex;align-items:center;gap:16px;margin-top:14px}
.dn svg{width:120px;height:120px;flex:0 0 auto}
.lgd div{margin:4px 0}
.sq{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:6px}
.faq h3{font-size:1rem;margin:14px 0 2px;color:var(--ink)}
.faq p{margin:2px 0}
.faq .exm{background:var(--key);border-left:5px solid var(--hot);padding:10px 12px;border-radius:10px;color:var(--ink)}
@media (prefers-reduced-motion:no-preference){.out{animation:pop .25s}}
@keyframes pop{from{transform:scale(.98);opacity:.6}}