/* Layout: a ledger book — red-ruled header band, content "page" on the left, ad column on the right, results written like a khata entry */
:root{
  --paper:#F5F7F4; --sheet:#FFFFFF; --ink:#13241D; --muted:#5B6B63; --rule:#DCE3DE;
  --khata:#B3261E; --khata-soft:#F6E3E1; --marigold:#D98E04; --marigold-soft:#FBEFD5;
  --display:"Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --body:"IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono:"IBM Plex Mono", ui-monospace, Menlo, monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#0F1714; --sheet:#16211C; --ink:#E7EEEA; --muted:#98A9A0; --rule:#2A3832;
  --khata:#F06A5E; --khata-soft:#3A1E1B; --marigold:#F2B33D; --marigold-soft:#352A12; color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#0F1714; --sheet:#16211C; --ink:#E7EEEA; --muted:#98A9A0; --rule:#2A3832;
  --khata:#F06A5E; --khata-soft:#3A1E1B; --marigold:#F2B33D; --marigold-soft:#352A12; color-scheme:dark}

*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.6 var(--body)}
a{color:var(--khata)}
.wrap{max-width:1120px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}

/* Header band (always red, white text in both themes) */
header.site{background:#B3261E;color:#fff;border-bottom:4px double rgba(255,255,255,.45)}
header.site .wrap{padding-block:18px 14px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px}
.brand{font:800 clamp(26px,5vw,36px)/1 var(--display);letter-spacing:-.02em;margin:0;color:#fff;text-decoration:none}
.brand span{color:#FFD58A}
.tag{margin:4px 0 0;opacity:.9;font-size:14px}
.sitenav{display:flex;flex-wrap:wrap;gap:4px 18px}
.sitenav a{color:#fff;text-decoration:none;font-weight:600;font-size:14px;opacity:.85;padding-block:4px;border-bottom:2px solid transparent}
.sitenav a:hover,.sitenav a[aria-current="page"]{opacity:1;border-bottom-color:#FFD58A}

nav.tabs{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:var(--sheet);border-bottom:1px solid var(--rule)}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:#B3261E}
nav.tabs .wrap{display:flex;gap:2px;overflow-x:auto}
nav.tabs a{flex:none;padding:12px 14px;color:var(--muted);text-decoration:none;font-weight:600;font-size:14px;border-bottom:3px solid transparent}
nav.tabs a:hover{color:var(--ink)}
nav.tabs a[aria-current="page"]{color:var(--khata);border-bottom-color:var(--khata)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--marigold);outline-offset:2px}

/* Ad slots — replace the inner placeholder with your AdSense <ins> code */
.ad{display:grid;place-items:center;text-align:center;border:1.5px dashed var(--rule);border-radius:6px;color:var(--muted);font:500 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;background:repeating-linear-gradient(135deg,transparent 0 10px,color-mix(in srgb,var(--rule) 35%,transparent) 10px 11px)}
.ad small{display:block;font:400 11px var(--body);letter-spacing:0;text-transform:none;margin-top:2px}
.ad-top{min-height:90px;margin-block:20px}
.ad-side{min-height:600px;position:sticky;top:70px}
.ad-inline{min-height:250px;margin-block:24px}

.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;padding-block:0 40px}
@media (max-width:900px){.layout{grid-template-columns:minmax(0,1fr)} .side{display:none}}

/* Calculator */
.calc{background:var(--sheet);border:1px solid var(--rule);border-radius:8px;overflow:hidden}
.calc-head{padding:20px 24px 4px}
.calc-head h1{font:800 clamp(24px,4vw,30px)/1.15 var(--display);margin:0;text-wrap:balance;letter-spacing:-.01em}
.calc-head p{margin:6px 0 0;color:var(--muted);max-width:60ch}
.grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
@media (max-width:640px){.grid{grid-template-columns:minmax(0,1fr)}}
.inputs{padding:20px 24px 24px;display:flex;flex-direction:column;gap:22px}
.field label{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-weight:600;font-size:14px}
.field .box{display:flex;align-items:center;border:1px solid var(--rule);border-radius:5px;background:var(--paper);padding:2px 8px;font:500 14px var(--mono);flex:none}
.field .box input{width:9ch;border:0;background:transparent;color:var(--ink);font:inherit;text-align:right;padding:4px 2px}
.field .hint{font:400 12px var(--body);color:var(--muted);margin-top:4px}
input[type=range]{width:100%;margin-top:10px;accent-color:var(--khata)}
.seg{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.seg button{font:600 13px var(--body);padding:7px 12px;border-radius:5px;border:1px solid var(--rule);background:var(--paper);color:var(--ink);cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--khata);border-color:var(--khata);color:var(--sheet)}

.result{padding:20px 24px 24px;background:var(--paper);border-left:1px solid var(--rule);background-image:repeating-linear-gradient(to bottom,transparent 0 31px,var(--rule) 31px 32px);background-position:0 12px}
@media (max-width:640px){.result{border-left:0;border-top:1px solid var(--rule)}}
.big-label{font:500 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.big{font:800 clamp(30px,5vw,40px)/1.1 var(--display);color:var(--khata);letter-spacing:-.02em;margin:4px 0 2px;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.words{font-size:13px;color:var(--muted);min-height:1.6em}
.rows{margin:16px 0 0;display:flex;flex-direction:column}
.rows div{display:flex;justify-content:space-between;gap:12px;padding:5px 0;border-bottom:1px solid var(--rule)}
.rows dt{color:var(--muted)}
.rows dd{margin:0;font:500 14px var(--mono);font-variant-numeric:tabular-nums;text-align:right}
.rows .total dd,.rows .total dt{color:var(--ink);font-weight:600}
.split{display:flex;height:14px;border-radius:3px;overflow:hidden;margin-top:18px;background:var(--rule)}
.split i{display:block;transition:width .3s}
.key{display:flex;flex-wrap:wrap;gap:14px;margin-top:8px;font-size:12px;color:var(--muted)}
.key b{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:6px;vertical-align:-1px}
.note{margin-top:14px;font-size:13px;color:var(--ink);background:var(--marigold-soft);border-radius:5px;padding:8px 10px}

.table-wrap{overflow-x:auto;border-top:1px solid var(--rule)}
details summary{cursor:pointer;padding:14px 24px;font-weight:600;color:var(--khata)}
table{width:100%;border-collapse:collapse;font:500 13px var(--mono);font-variant-numeric:tabular-nums}
th,td{padding:8px 24px;text-align:right;border-bottom:1px solid var(--rule);white-space:nowrap}
th{font:600 11px var(--body);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
th:first-child,td:first-child{text-align:left}

.faq{margin-top:8px;display:flex;flex-direction:column;gap:16px;max-width:68ch}
.faq h2{font:800 20px/1.2 var(--display);margin:0}
.faq h3{font-size:15px;margin:0 0 2px}
.faq p{margin:0;color:var(--muted)}

/* Articles and plain pages */
.prose{background:var(--sheet);border:1px solid var(--rule);border-radius:8px;padding:28px clamp(18px,4vw,40px) 36px;margin-top:20px}
.prose .kicker{font:500 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--khata);margin:0}
.prose h1{font:800 clamp(26px,4.5vw,36px)/1.15 var(--display);letter-spacing:-.015em;margin:8px 0 6px;text-wrap:balance;max-width:24ch}
.prose .meta{color:var(--muted);font-size:13px;margin:0 0 22px}
.prose h2{font:800 21px/1.25 var(--display);margin:30px 0 8px;text-wrap:balance}
.prose p,.prose li{max-width:66ch}
.prose ul,.prose ol{padding-left:1.3em}
.prose li{margin-bottom:6px}
.prose .tbl{overflow-x:auto;margin:14px 0;border:1px solid var(--rule);border-radius:6px}
.prose table td,.prose table th{padding:8px 14px}
.prose table tr:last-child td{border-bottom:0}
.cta{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;background:var(--khata-soft);border-radius:6px;padding:14px 18px;margin:24px 0}
.cta p{margin:0;font-weight:600}
.btn{display:inline-block;background:var(--khata);color:var(--sheet);text-decoration:none;font-weight:600;padding:9px 16px;border-radius:5px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:16px;margin-top:20px}
.card{background:var(--sheet);border:1px solid var(--rule);border-radius:8px;padding:18px 20px;text-decoration:none;color:var(--ink);display:flex;flex-direction:column;gap:6px}
.card:hover{border-color:var(--khata)}
.card h2{font:800 19px/1.25 var(--display);margin:0;text-wrap:balance}
.card p{margin:0;color:var(--muted);font-size:14px}
.card .kicker{font:500 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--khata)}
.page-head{padding-top:28px}
.page-head h1{font:800 clamp(26px,4.5vw,36px)/1.15 var(--display);margin:0}
.page-head p{color:var(--muted);margin:6px 0 0;max-width:60ch}

footer{border-top:1px solid var(--rule);color:var(--muted);font-size:13px}
footer .wrap{padding-block:20px;display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between}
footer nav{display:flex;flex-wrap:wrap;gap:6px 16px}
footer a{color:var(--muted)}
.seg button{white-space:normal;text-align:left;line-height:1.35;min-height:38px}
nav.tabs .wrap{scrollbar-width:none;-webkit-overflow-scrolling:touch}
nav.tabs .wrap::-webkit-scrollbar{display:none}

/* Phones */
@media (max-width:640px){
  body{font-size:16px}
  .field .box{font-size:16px}               /* 16px stops iOS zooming into inputs */
  .field .box input{width:8ch}
  .inputs,.result,.calc-head{padding-left:16px;padding-right:16px}
  details summary{padding-inline:16px}
  th,td{padding:8px 14px}
  .ad-top{min-height:100px}                 /* 320×100 mobile banner */
  .ad-inline{min-height:250px}
  header.site .wrap{padding-block:14px 12px}
  .tag{display:none}
  input[type=range]{height:28px}
  .cta{flex-direction:column;align-items:flex-start}
}
@media (prefers-reduced-motion:reduce){.split i{transition:none}}