/* Layout: slim top bar with an all-calculators menu; home = searchable grid of calculators by group; calculator = inputs rail left, live results right, stacking on phones */
:root{
  --bg:#F3F6FC; --surface:#FFFFFF; --ink:#0B1B33; --muted:#5A6A83; --line:#DCE4F0;
  --blue:#1D4ED8; --blue-strong:#163FB0; --blue-soft:#E8EFFD; --blue-tint:#93B2F4;
  --hero:#1D4ED8; --hero-2:#2F63F0; --on-hero:#FFFFFF; --on-hero-muted:rgba(255,255,255,.8); --on-hero-line:rgba(255,255,255,.22);
  --good:#0E8A5C; --good-soft:#E2F5EC; --warn:#A55A08; --warn-soft:#FDF1DF; --bad:#C62828;
  --s1:#1D4ED8; --s2:#93B2F4; --s3:#0891B2; --s4:#6366F1; --s5:#0F2F7A; --s6:#B6C4DC;
  --font-display:"Plus Jakarta Sans","Segoe UI",system-ui,sans-serif;
  --font-body:"Inter","Segoe UI",system-ui,sans-serif;
  --r:14px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#06101E; --surface:#0C1A2E; --ink:#E6EEFB; --muted:#93A4BF; --line:#1C2E49;
  --blue:#5B8CFF; --blue-strong:#86A9FF; --blue-soft:#12264A; --blue-tint:#3E62AE;
  --hero:#163FB0; --hero-2:#1D4ED8; --good:#3CCB94; --good-soft:#0D2D24; --warn:#F2B35A; --warn-soft:#30220C; --bad:#FF8A80;
  --s1:#5B8CFF; --s2:#3E62AE; --s3:#38BDF8; --s4:#818CF8; --s5:#C3D5FF; --s6:#4A5C7A; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#06101E; --surface:#0C1A2E; --ink:#E6EEFB; --muted:#93A4BF; --line:#1C2E49;
  --blue:#5B8CFF; --blue-strong:#86A9FF; --blue-soft:#12264A; --blue-tint:#3E62AE;
  --hero:#163FB0; --hero-2:#1D4ED8; --good:#3CCB94; --good-soft:#0D2D24; --warn:#F2B35A; --warn-soft:#30220C; --bad:#FF8A80;
  --s1:#5B8CFF; --s2:#3E62AE; --s3:#38BDF8; --s4:#818CF8; --s5:#C3D5FF; --s6:#4A5C7A; color-scheme:dark}

*{box-sizing:border-box}
body{background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}
.wrap{max-width:1180px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
h1,h2,h3{font-family:var(--font-display);margin:0;text-wrap:balance;letter-spacing:-.01em}
a{color:var(--blue)}
.num{font-variant-numeric:tabular-nums}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px}

/* top bar */
.top{border-bottom:1px solid var(--line);background:var(--surface);position:relative;z-index:5}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:12px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:19px;color:var(--ink);text-decoration:none}
.mark{width:30px;height:30px;border-radius:8px;background:var(--blue);display:grid;place-items:center;flex:none}
.menu{position:relative}
.menu summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:8px;font-weight:600;font-size:14px;padding:8px 12px;border-radius:10px;border:1px solid var(--line)}
.menu summary::-webkit-details-marker{display:none}
.menu[open] summary{background:var(--blue-soft);border-color:transparent;color:var(--blue)}
.menu-panel{position:absolute;right:0;top:calc(100% + 8px);width:min(640px,calc(100vw - 32px));background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:0 18px 40px rgba(8,24,56,.16);padding:18px;display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:16px}
.menu-panel h3{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:6px}
.menu-panel a{display:block;text-decoration:none;color:var(--ink);font-size:14px;padding:4px 0}
.menu-panel a:hover,.menu-panel a[aria-current]{color:var(--blue)}

/* home */
.home-hero{padding-block:40px 20px;display:flex;flex-direction:column;gap:12px}
.home-hero h1{font-size:clamp(30px,5vw,46px);font-weight:800;max-width:20ch}
.home-hero p{color:var(--muted);margin:0;max-width:60ch;font-size:16px}
.search{max-width:420px;margin-top:8px}
.group-block{padding-block:16px}
.group-block h2{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:12px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.ccard{display:flex;gap:12px;align-items:flex-start;text-decoration:none;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:16px;transition:border-color .15s,transform .15s}
.ccard:hover{border-color:var(--blue);transform:translateY(-1px)}
.ccard .gl{flex:none;width:36px;height:36px;border-radius:10px;background:var(--blue-soft);color:var(--blue);display:grid;place-items:center;font-family:var(--font-display);font-weight:800;font-size:15px}
.ccard b{display:block;font-family:var(--font-display);font-size:16px}
.ccard span{display:block;color:var(--muted);font-size:13px;margin-top:2px}
.empty{color:var(--muted);padding-block:20px}
.promise{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;padding-block:28px 48px}
.promise div{border-top:2px solid var(--blue);padding-top:12px}
.promise b{font-family:var(--font-display)}
.promise p{margin:4px 0 0;color:var(--muted);font-size:14px}

/* calculator page */
.crumbs{padding-block:18px 0;font-size:13px;color:var(--muted)}
.crumbs a{text-decoration:none}
.intro{padding-block:6px 4px}
.intro h1{font-size:clamp(26px,4vw,36px);font-weight:800}
.intro p{color:var(--muted);margin:6px 0 0;max-width:64ch}
.grid{display:grid;grid-template-columns:340px minmax(0,1fr);gap:24px;align-items:start;padding-block:20px 40px}
@media (max-width:920px){.grid{grid-template-columns:minmax(0,1fr)}}

.rail{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px;display:flex;flex-direction:column;gap:14px;position:sticky;top:16px}
@media (max-width:920px){.rail{position:static}}
.rail .sec{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:700;font-family:var(--font-display);padding-top:12px;border-top:1px solid var(--line);margin-top:4px}
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field>label,.field>.lbl{font-size:13px;font-weight:600}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.box{display:flex;align-items:center;border:1px solid var(--line);border-radius:10px;background:var(--bg);transition:border-color .15s,box-shadow .15s}
.box:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-soft)}
.box span{padding:0 10px;color:var(--muted);font-size:14px;flex:none}
.box input,.box select{flex:1;min-width:0;width:100%;border:0;background:transparent;color:var(--ink);font:inherit;font-size:16px;font-weight:600;padding:10px 12px;outline:none;font-variant-numeric:tabular-nums}
.box span+input{padding-left:0}
.box select{font-weight:500;font-size:15px;cursor:pointer}
.box select option{background:var(--surface);color:var(--ink)}
input[type=range]{width:100%;accent-color:var(--blue)}
.hint{font-size:12px;color:var(--muted);margin:0}
.seg{display:flex;flex-wrap:wrap;gap:4px;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:4px}
.seg label{flex:1 1 auto;position:relative;cursor:pointer}
.seg input{position:absolute;opacity:0;inset:0;cursor:pointer}
.seg span{display:block;text-align:center;font-size:13px;font-weight:600;padding:7px 8px;border-radius:7px;color:var(--muted);white-space:nowrap}
.seg input:checked+span{background:var(--surface);color:var(--blue);box-shadow:0 1px 3px rgba(8,24,56,.12)}
.seg input:focus-visible+span{outline:2px solid var(--blue)}
.check{display:flex;gap:10px;align-items:center;font-size:14px;font-weight:500;cursor:pointer}
.check input{width:18px;height:18px;accent-color:var(--blue)}
.linkbtn{background:none;border:0;color:var(--blue);font:inherit;font-size:13px;font-weight:600;cursor:pointer;padding:0;text-align:left}
.err{color:var(--bad);font-size:13px;margin:0}

.results{display:flex;flex-direction:column;gap:20px;min-width:0}
.hero{background:linear-gradient(135deg,var(--hero),var(--hero-2));color:var(--on-hero);border-radius:18px;padding:26px;display:flex;flex-direction:column;gap:22px}
.hero .label{font-size:12px;text-transform:uppercase;letter-spacing:.09em;color:var(--on-hero-muted);font-weight:600}
.big{font-family:var(--font-display);font-weight:800;font-size:clamp(36px,6.5vw,58px);line-height:1.05;letter-spacing:-.02em;margin-top:6px;overflow-wrap:anywhere}
.big small{font-size:.38em;font-weight:600;color:var(--on-hero-muted);letter-spacing:0}
.hero .sub{color:var(--on-hero-muted);font-size:14px;margin-top:8px}
.hstats{display:grid;border-top:1px solid var(--on-hero-line);padding-top:18px;gap:16px}
.hstats div{min-width:0}
.hstats b{display:block;font-family:var(--font-display);font-size:20px;font-weight:700;margin-top:2px;overflow-wrap:anywhere}
@media (max-width:520px){.hstats{grid-template-columns:1fr 1fr!important}}

.banner{display:flex;gap:14px;align-items:center;border-radius:var(--r);padding:16px 18px;border:1px solid var(--line);background:var(--surface)}
.banner.good{background:var(--good-soft);border-color:transparent}
.banner.warn{background:var(--warn-soft);border-color:transparent}
.banner .ico{flex:none;width:38px;height:38px;border-radius:10px;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue)}
.banner.good .ico{background:var(--good);color:var(--surface)}
.banner.warn .ico{background:var(--warn);color:var(--surface)}
.banner p{margin:0;min-width:0}
.banner strong{color:var(--blue)}
.banner.good strong{color:var(--good)}
.banner.warn strong{color:var(--warn)}
.btn{flex:none;margin-left:auto;border:0;border-radius:10px;background:var(--blue);color:#fff;font:inherit;font-weight:600;font-size:14px;padding:9px 14px;cursor:pointer}
.btn:hover{background:var(--blue-strong)}
.btn.ghost{background:var(--blue-soft);color:var(--blue);margin-left:0}
@media (max-width:520px){.banner{flex-wrap:wrap}.banner .btn{margin-left:52px}}

.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px;min-width:0}
.card-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.card h2{font-size:18px;font-weight:700}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:12px;color:var(--muted)}
.legend i{display:inline-block;width:14px;height:3px;border-radius:2px;vertical-align:middle;margin-right:6px}
.chartbox{position:relative}
.chartbox svg{width:100%;height:auto;display:block;touch-action:pan-y}
.tip{position:absolute;top:0;pointer-events:none;background:var(--ink);color:var(--bg);border-radius:10px;padding:9px 11px;font-size:12px;line-height:1.45;white-space:nowrap;transform:translateX(-50%);box-shadow:0 6px 20px rgba(0,0,0,.18);z-index:2}
.tip b{font-size:13px}
.split{display:flex;height:14px;border-radius:99px;overflow:hidden;background:var(--blue-soft);gap:2px}
.split div{min-width:2px}
.splitlbl{display:flex;gap:8px 18px;margin-top:12px;font-size:13px;flex-wrap:wrap}
.splitlbl div{display:flex;align-items:center;gap:6px}
.splitlbl i{width:10px;height:10px;border-radius:3px;flex:none}
.splitlbl span{color:var(--muted)}
.insights{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
@media (max-width:620px){.insights{grid-template-columns:1fr}}
.ins{border:1px solid var(--line);border-radius:12px;padding:14px;display:flex;flex-direction:column;gap:4px}
.ins .k{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:700}
.ins .v{font-family:var(--font-display);font-size:20px;font-weight:700;color:var(--blue)}
.ins p{margin:0;font-size:13px;color:var(--muted)}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;max-height:620px;overflow-y:auto}
table{width:100%;border-collapse:collapse;font-size:14px;font-variant-numeric:tabular-nums}
table.wide{min-width:600px}
th{position:sticky;top:0;background:var(--bg);text-align:right;font-size:11px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);padding:10px 14px;font-weight:700;border-bottom:1px solid var(--line);z-index:1}
th:first-child,td:first-child{text-align:left}
td{padding:9px 14px;text-align:right;border-bottom:1px solid var(--line)}
tr:last-child td{border-bottom:0}
tr.hl td{background:var(--blue-soft);font-weight:700;color:var(--blue)}
tr.tot td{font-weight:700;border-top:2px solid var(--line)}
tr.y td{font-weight:600}
tr.y:hover td{background:var(--blue-soft)}
tr.m td{font-size:13px;color:var(--muted);background:var(--bg)}
.yr{background:none;border:0;font:inherit;font-weight:700;color:var(--ink);cursor:pointer;display:inline-flex;align-items:center;gap:8px;padding:0}
.yr svg{transition:transform .15s;color:var(--blue)}
.yr[aria-expanded="true"] svg{transform:rotate(90deg)}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.formula{font-size:13px;color:var(--muted);margin:0;line-height:1.6}
.formula code{font-family:ui-monospace,"Cascadia Mono",Consolas,monospace;color:var(--ink);background:var(--blue-soft);padding:2px 6px;border-radius:6px}
.related{display:flex;flex-wrap:wrap;gap:8px}
.related a{text-decoration:none;font-size:13px;font-weight:600;padding:7px 12px;border-radius:99px;background:var(--blue-soft)}
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:10px;font-size:14px;font-weight:600;z-index:20}
.copyfall{width:100%;height:120px;margin-top:10px;font:12px ui-monospace,Consolas,monospace;background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:8px}
footer{color:var(--muted);font-size:12px;padding-block:8px 32px}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* ---- multi-page site additions ---- */
.skip{position:absolute;left:-9999px;top:8px;background:var(--surface);color:var(--blue);padding:8px 12px;border-radius:8px;z-index:30;font-weight:600}
.skip:focus{left:max(16px,env(safe-area-inset-left,0px))}
.guide{max-width:760px;padding-block:8px 32px;font-size:16px;line-height:1.7}
.guide h1{font-size:clamp(28px,4.5vw,40px);font-weight:800;margin:28px 0 12px}
.guide h2{font-size:clamp(20px,2.6vw,24px);font-weight:700;margin:36px 0 10px}
.guide h3{font-size:17px;font-weight:700;margin:0 0 4px;font-family:var(--font-display)}
.guide p{margin:0 0 14px}
.guide ul,.guide ol{margin:0 0 14px;padding-left:22px;display:flex;flex-direction:column;gap:6px}
.guide code{font-family:ui-monospace,"Cascadia Mono",Consolas,monospace;font-size:.88em;background:var(--blue-soft);padding:2px 6px;border-radius:6px;overflow-wrap:anywhere}
.guide strong{font-weight:650}
.example{background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:12px;padding:16px 18px}
.example p:last-child{margin-bottom:0}
.qa{padding-block:14px;border-top:1px solid var(--line)}
.qa:last-of-type{border-bottom:1px solid var(--line)}
.qa p{margin:0;color:var(--muted)}
.related-card{margin-bottom:28px}
.prose{padding-bottom:48px}
.contact-box .mail{font-size:18px;font-weight:600;overflow-wrap:anywhere}
.site-foot{border-top:1px solid var(--line);background:var(--surface);color:var(--muted);font-size:13px;padding-block:20px 28px}
.site-foot p{margin:6px 0 0}
.foot-links{display:flex;flex-wrap:wrap;gap:8px 20px;margin-bottom:8px}
.foot-links a{color:var(--ink);text-decoration:none;font-weight:600}
.foot-links a:hover{color:var(--blue)}
.ccard[hidden],.group-block[hidden]{display:none}
#calc-root noscript .card{grid-column:1/-1}