/* thesingaporecalculator.com — each category is a "line"; its colour runs through hubs, breadcrumbs and result panels. */
:root{
  --ink:#17212B;--muted:#55636E;--paper:#F2F4F3;--panel:#FFFFFF;--rule:#D3DAD7;--soft:#E7ECEA;
  --line:#D42E12;--focus:#005EC4;
  --display:"Bricolage Grotesque","Segoe UI",system-ui,sans-serif;
  --body:"Atkinson Hyperlegible","Segoe UI",system-ui,-apple-system,sans-serif;
  --r-s:6px;--r-m:12px;
  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"]){--ink:#E8EDEA;--muted:#A6B2AD;--paper:#141A1F;--panel:#1C242B;--rule:#33404A;--soft:#232D35;--focus:#7FB2FF}}
:root[data-theme="dark"]{--ink:#E8EDEA;--muted:#A6B2AD;--paper:#141A1F;--panel:#1C242B;--rule:#33404A;--soft:#232D35;--focus:#7FB2FF}
*,*::before,*::after{box-sizing:inherit}
html{scroll-padding-top:env(safe-area-inset-top,0px);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.6 var(--body)}
img{max-width:100%}
a{color:inherit;text-decoration-color:color-mix(in srgb,var(--line) 70%,transparent);text-underline-offset:3px;text-decoration-thickness:2px}
a:hover{text-decoration-color:var(--line)}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:3px}
.wrap{max-width:1140px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:var(--panel);padding:8px 12px;z-index:9}

/* the system-map stripe: one segment per line */
.stripe{display:flex;height:6px}
.stripe i{flex:1}
header.top{background:var(--panel);border-bottom:1px solid var(--rule)}
.bar{display:flex;align-items:center;gap:20px;min-height:64px;flex-wrap:wrap;padding:8px 0}
.logo{font:700 1.2rem/1 var(--display);text-decoration:none;display:flex;align-items:center;gap:10px;letter-spacing:-.01em}
.logo svg{flex:none}
nav.main{display:flex;gap:4px 16px;flex-wrap:wrap;font-size:.95rem;margin-left:auto}
nav.main a{text-decoration:none;color:var(--muted);padding:4px 0;border-bottom:3px solid transparent}
nav.main a:hover{color:var(--ink);border-bottom-color:var(--c)}

h1,h2,h3{font-family:var(--display);line-height:1.15;letter-spacing:-.015em;margin:1.6em 0 .5em}
h1{font-size:clamp(1.9rem,4.2vw,2.9rem);font-weight:700;margin-top:.4em;max-width:22ch}
h2{font-size:1.5rem;font-weight:650}
h3{font-size:1.15rem;font-weight:650}
p,li{max-width:70ch}
.lede{font-size:1.15rem;color:var(--muted);max-width:62ch}

/* breadcrumb as a station trail */
.trail{list-style:none;margin:22px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:0;font-size:.9rem;color:var(--muted)}
.trail li{display:flex;align-items:center}
.trail li+li::before{content:"";width:22px;height:4px;background:var(--line);margin:0 6px 0 0}
.trail a,.trail span{display:inline-flex;align-items:center;gap:6px}
.trail a::before,.trail span::before{content:"";flex:none;width:10px;height:10px;border-radius:50%;border:3px solid var(--line);background:var(--panel)}
.trail li+li a::before,.trail li+li span::before{margin-left:-2px}
.trail a{text-decoration:none}

/* home */
.hero{padding:48px 0 30px}
.hero h1{font-size:clamp(2.4rem,6vw,4.2rem);max-width:15ch;margin:0 0 14px;font-weight:800;letter-spacing:-.03em}
.search{display:flex;gap:8px;max-width:620px;margin-top:22px}
.search input{flex:1;font:inherit;padding:14px 16px;border:2px solid var(--ink);border-radius:var(--r-s);background:var(--panel);color:var(--ink)}
.btn{font:700 1rem/1 var(--body);padding:14px 20px;border-radius:var(--r-s);border:2px solid var(--ink);background:var(--ink);color:var(--panel);cursor:pointer;text-decoration:none;display:inline-block}
.btn.ghost{background:transparent;color:var(--ink)}

.map{margin:28px 0 10px;display:grid;gap:30px}
.line h2{display:flex;align-items:center;gap:12px;margin:0 0 4px;font-size:1.3rem}
.line h2 a{text-decoration:none}
.line h2 .code{font:700 .8rem/1 var(--body);color:#fff;background:var(--c);border-radius:4px;padding:5px 7px}
.line>p{margin:0 0 12px;color:var(--muted);font-size:.95rem}
.stations{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;position:relative;row-gap:16px}
.stations::before{content:"";position:absolute;left:0;right:0;top:9px;height:6px;background:var(--c);border-radius:3px}
.stations li{position:relative;flex:1 1 150px;padding-top:28px;padding-right:12px;font-size:.93rem;line-height:1.35;max-width:none}
.stations li::before{content:"";position:absolute;top:2px;left:0;width:20px;height:20px;border-radius:50%;background:var(--panel);border:4px solid var(--c)}
.stations a{text-decoration:none}
.stations a:hover{text-decoration:underline;text-decoration-color:var(--c)}

/* calculator */
.calc-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:24px;margin:22px 0 10px;align-items:start}
@media (max-width:820px){.calc-grid{grid-template-columns:1fr}}
form.calc{background:var(--panel);border:1px solid var(--rule);border-radius:var(--r-m);padding:22px}
.field{margin-bottom:16px}
.field label{display:block;font-weight:700;font-size:.95rem;margin-bottom:6px}
.field input,.field select{width:100%;font:inherit;font-variant-numeric:tabular-nums;padding:11px 12px;border:1.5px solid var(--rule);border-radius:var(--r-s);background:var(--paper);color:var(--ink)}
.field input:focus,.field select:focus{border-color:var(--line);outline:none;box-shadow:0 0 0 3px color-mix(in srgb,var(--line) 25%,transparent)}
.field [aria-invalid="true"]{border-color:#C0392B}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}
.result{background:var(--panel);border:1px solid var(--rule);border-top:8px solid var(--line);border-radius:var(--r-m);padding:18px 22px 20px;position:sticky;top:16px}
.result h2{margin:0 0 6px;font-size:1.05rem;color:var(--muted);font-weight:600}
.result dl{margin:0}
.row{padding:12px 0;border-bottom:1px dashed var(--rule)}
.row:last-of-type{border-bottom:0}
.row dt{font-size:.9rem;color:var(--muted)}
.row dd{margin:2px 0 0;font:700 1.35rem/1.25 var(--display);font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.row:first-child dd{font-size:2rem}
.msg{background:color-mix(in srgb,#C0392B 12%,var(--panel));padding:10px 12px;border-radius:var(--r-s);font-size:.95rem}
.copy{margin-top:10px;font:600 .9rem var(--body);background:none;border:1.5px solid var(--rule);color:var(--ink);padding:8px 12px;border-radius:var(--r-s);cursor:pointer}

.prose{max-width:760px}
.prose h2{border-left:6px solid var(--line);padding-left:12px;margin-left:-18px}
@media (max-width:820px){.prose h2{margin-left:0}}
.formula{background:var(--soft);border-radius:var(--r-s);padding:14px 16px;font-size:1.02rem;max-width:70ch}
.note{border:1.5px solid var(--line);border-radius:var(--r-s);padding:12px 16px;max-width:70ch;font-size:.97rem}
.tbl{overflow-x:auto;margin:14px 0}
table{border-collapse:collapse;min-width:100%;font-variant-numeric:tabular-nums;background:var(--panel);font-size:.95rem}
th,td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--rule);white-space:nowrap}
th{background:var(--soft);font-weight:700}
details{background:var(--panel);border:1px solid var(--rule);border-radius:var(--r-s);padding:12px 16px;margin:8px 0;max-width:760px}
summary{font-weight:700;cursor:pointer}
.cols{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:8px 24px;padding:0;list-style:none}
.cols li a{text-decoration:none}.cols li a:hover{text-decoration:underline}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;list-style:none;padding:0}
.cards li{background:var(--panel);border:1px solid var(--rule);border-left:6px solid var(--c,var(--line));border-radius:var(--r-s);padding:14px 16px}
.cards a{text-decoration:none;font-weight:700}
.cards p{margin:6px 0 0;font-size:.92rem;color:var(--muted)}
.pager{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0}
.pager a,.pager span{padding:6px 12px;border:1.5px solid var(--rule);border-radius:var(--r-s);text-decoration:none}
.pager span{background:var(--ink);color:var(--panel);border-color:var(--ink)}
.meta{color:var(--muted);font-size:.92rem}
footer{margin-top:60px;background:var(--panel);border-top:1px solid var(--rule);padding:30px 0;font-size:.93rem;color:var(--muted)}
footer .cols{grid-template-columns:repeat(auto-fill,minmax(180px,1fr))}
footer h3{color:var(--ink);font-size:1rem;margin:0 0 8px}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
@media print{header.top,footer,.actions,.copy,form.calc{display:none}.result{position:static}}
@media (max-width:700px){nav.main{flex-wrap:nowrap;overflow-x:auto;margin-left:0;width:100%;white-space:nowrap;padding-bottom:4px;scrollbar-width:thin}.bar{min-height:0}}