/* KettleHour design system.
   One accent, cool-biased neutrals, 8pt spacing, hairlines instead of shadows, three type weights,
   sentence-case labels, no one-side accent bars, no decorative pills, visible focus, reduced motion respected. */

@import url('https://fonts.googleapis.com/css2?family=Source+Sans+3:wght@400;500;600&display=swap');

:root{
  /* tell the user agent both themes exist so native controls follow */
  color-scheme: light dark;
  /* neutrals with a slight cool bias */
  --bg:#f5f6f8; --surface:#ffffff; --surface-2:#eef0f4;
  --border:#d9dee7; --border-strong:#7c879a;
  --text:#151b26; --muted:#566173;
  /* the single accent */
  --accent:#1f4fd1; --accent-hover:#1a42b0; --on-accent:#ffffff; --accent-soft:#e8eefc; --accent-line:#b7c7f2;
  --ring:rgba(31,79,209,.35);
  /* semantic colours, separate from the accent */
  --good:#1a7f4b; --warn:#9a5b00; --danger:#b42318;
  /* aliases kept for a few page-level styles */
  --brand:var(--accent); --brand-ink:var(--accent-hover); --shadow:none;
  /* shape */
  --r-control:4px; --r-panel:8px; --maxw:960px;
  --pad-panel:16px; --pad-panel-lg:24px;
  /* one type scale: 12 13 14 16 18 24 32 36 */
  --fs-xs:.75rem; --fs-sm:.8125rem; --fs-base:.875rem; --fs-md:1rem;
  --fs-lg:1.125rem; --fs-xl:1.5rem; --fs-2xl:2rem; --fs-3xl:2.25rem;
  /* one motion token */
  --dur:160ms; --ease:cubic-bezier(.2,0,0,1);
  --font:"Source Sans 3",-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#0f1319; --surface:#161b23; --surface-2:#1e252f;
    --border:#2a323f; --border-strong:#626e80;
    --text:#e6eaf0; --muted:#9aa5b5;
    --accent:#7ea2ff; --accent-hover:#9bb6ff; --on-accent:#0f1319; --accent-soft:#1a2540; --accent-line:#2f4478;
    --ring:rgba(126,162,255,.4);
    --good:#4cc38a; --warn:#e5a23c; --danger:#ff7a6e;
  }
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto} *{transition:none !important;animation:none !important}}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:var(--fs-md);line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media (forced-colors:active){:focus-visible{outline:3px solid Highlight;outline-offset:2px}}
h1,h2,h3,h4{line-height:1.2;margin:0 0 8px;font-weight:600;text-wrap:balance}
h1{font-size:var(--fs-2xl);margin:8px 0 16px;letter-spacing:-.01em;max-width:30ch}
h2{font-size:var(--fs-xl);margin-top:48px;letter-spacing:-.01em}
h3{font-size:var(--fs-lg);margin-top:24px}
p{margin:.65em 0}
small{color:var(--muted);font-size:var(--fs-base)}
strong{font-weight:600}
code{font-family:var(--mono);font-size:.9em;background:var(--surface-2);padding:.1em .35em;border-radius:var(--r-control)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 clamp(16px,4vw,32px)}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* Section rhythm: one tier between sections, headings carry the sub-tiers */
main>section+section,main>.container>section+section{margin-top:56px}
main>section>h2:first-child,main>.container>section>h2:first-child{margin-top:0}
main>.container>.lede+section{margin-top:48px}
@media (max-width:640px){main>section+section,main>.container>section+section{margin-top:40px}main>.container>.lede+section{margin-top:40px}}

/* Header */
.site-header{position:sticky;top:0;z-index:20;background:var(--surface);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;gap:24px;height:56px;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:600;font-size:var(--fs-md);color:var(--text);flex:none}
.brand:hover{text-decoration:none}
.brand .logo{width:24px;height:24px;color:var(--accent);flex:none}
.nav .spacer{flex:1}
.nav a.navlink{color:var(--muted);font-weight:500;font-size:var(--fs-base);padding:6px 2px;flex:none;white-space:nowrap}
.nav a.navlink:hover{color:var(--text);text-decoration:none}
.nav a.navlink[aria-current]{color:var(--text);text-decoration:underline;text-decoration-color:var(--accent);
  text-decoration-thickness:2px;text-underline-offset:6px}
@media (max-width:640px){.nav{gap:14px}.nav a.navlink{padding:6px 0}}

/* Hero: left-aligned, no pill */
.hero{padding-top:48px;padding-bottom:8px;text-align:left}
.hero h1{font-size:var(--fs-3xl);max-width:22ch}
.reassure{margin:0 0 12px;font-size:var(--fs-base);color:var(--muted);font-weight:500}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:20px 0 0}
.proof{display:flex;flex-wrap:wrap;gap:8px 28px;list-style:none;margin:20px 0 0;padding:14px 0 0;
  border-top:1px solid var(--border);color:var(--muted);font-size:var(--fs-base)}

/* Measure: one lede and one section intro, not four inline caps */
.lede{font-size:var(--fs-lg);line-height:1.5;color:var(--muted);max-width:62ch;margin:.5em 0 0}
.section-intro{color:var(--muted);max-width:64ch;margin:.35em 0 0}

/* Card grid: hairline cards, no shadow, no transform */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin:24px 0 8px}
.card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-panel);
  padding:var(--pad-panel);color:var(--text);transition:border-color var(--dur) var(--ease)}
.card:hover{border-color:var(--accent-line);text-decoration:none}
.card:hover h3{color:var(--accent)}
.card:focus-visible{border-color:var(--accent)}
.card .eyebrow{display:block;font-size:var(--fs-sm);font-weight:500;color:var(--muted);margin-bottom:4px}
.card h3{margin:0 0 4px;font-size:var(--fs-lg);color:var(--text);transition:color var(--dur) var(--ease)}
.card p{color:var(--muted);font-size:var(--fs-base);margin:0}

/* Layout */
main{padding:8px 0 64px}
.crumb{font-size:var(--fs-base);color:var(--muted);margin:20px 0 0}
.crumb a{color:var(--muted)}
/* Input groups are not carded; the result panel is the one contained region on a tool page. */
.tool{background:transparent;border:0;border-radius:0;padding:0;margin:16px 0}
.row{display:grid;gap:16px}
.row.c2{grid-template-columns:1fr 1fr}
.row.c3{grid-template-columns:1fr 1fr 1fr}
@media (max-width:640px){.row.c2,.row.c3{grid-template-columns:1fr}}

/* Document generators: the form beside the plain-text preview that becomes the printed page */
.docwrap{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:start}
.docwrap .tool{margin-top:0}
@media (max-width:860px){.docwrap{grid-template-columns:1fr}}
/* The preview is paper, so it keeps its own ink scope in both themes. */
.docpaper{--paper:#fff;--paper-ink:#151b26;background:var(--paper);color:var(--paper-ink);
  border:1px solid var(--border);border-radius:var(--r-panel);padding:clamp(16px,3vw,var(--pad-panel-lg));
  white-space:pre-wrap;font-size:var(--fs-base);line-height:1.6;min-height:300px}
@media print{.docwrap{display:block}.docpaper{border:0;padding:0}}

/* Forms */
.field{margin:12px 0 16px}
.field label,.lbl{display:block;font-weight:500;font-size:var(--fs-base);margin-bottom:6px;color:var(--text)}
.hint{color:var(--muted);font-size:var(--fs-sm)}
.field .hint{display:block;font-weight:400;margin:2px 0 6px}
/* the hint now sits beside the label rather than inside it; keep the original 2px gap */
.field label:has(+ .hint){margin-bottom:2px}
.field-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:6px}
.field-head span{font-weight:500;font-size:var(--fs-base);color:var(--text)}
input[type=text],input[type=number],input[type=date],input[type=time],input[type=email],input[type=file],select,textarea{
  width:100%;min-height:40px;padding:8px 12px;font:inherit;line-height:1.25;color:var(--text);background:var(--surface);
  border:1px solid var(--border-strong);border-radius:var(--r-control);
  font-variant-numeric:tabular-nums lining-nums;
  transition:border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}
input::placeholder,textarea::placeholder{color:var(--muted);opacity:1}
input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--ring)}
input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
select,input[type=date],input[type=time],input[type=file]{cursor:pointer}
textarea{min-height:88px;resize:vertical;line-height:1.5}
textarea[readonly]{background:var(--surface-2);color:var(--text);field-sizing:content;min-height:88px;overflow:hidden}
input[type=file]{color:var(--muted);padding:6px 8px}
input[type=file]::file-selector-button{font:inherit;font-weight:500;margin:0 12px 0 0;padding:4px 12px;min-height:28px;
  border:1px solid var(--border-strong);border-radius:var(--r-control);background:var(--surface);color:var(--text);cursor:pointer}
input[type=file]::file-selector-button:hover{background:var(--surface-2)}
/* Error state */
.err{color:var(--danger);font-size:var(--fs-sm);margin:4px 0 0}
input[aria-invalid="true"],select[aria-invalid="true"],textarea[aria-invalid="true"]{border-color:var(--danger)}

/* Buttons: primary uses the accent, secondary stays neutral */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;font:inherit;font-weight:500;
  min-height:40px;padding:8px 16px;border-radius:var(--r-control);border:1px solid var(--accent);
  background:var(--accent);color:var(--on-accent);line-height:1.2;
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.btn:hover{background:var(--accent-hover);border-color:var(--accent-hover);text-decoration:none}
.btn:active{background:var(--accent-hover);border-color:var(--accent-hover);filter:brightness(.93)}
.btn.ghost{background:var(--surface);color:var(--text);border-color:var(--border-strong)}
.btn.ghost:hover{background:var(--surface-2)}
.btn.ghost:active{background:var(--surface-2);border-color:var(--text)}
.btn.ghost.danger{color:var(--danger)}
.btn.ghost.danger:hover{background:var(--surface-2);border-color:var(--danger)}
.btn.small{min-height:32px;padding:4px 12px;font-size:var(--fs-base)}
.copybtn{min-width:6.5em;justify-content:center}
.controls{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:6px}
.controls .danger{margin-left:auto}

/* Repeating-row remove control: a real button that looks like the old glyph */
.lineitem .x,.trow .x{font:inherit;display:inline-flex;align-items:center;justify-content:center;
  background:none;border:0;color:var(--muted);cursor:pointer;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.li-head,.thead,.prov-head{font-size:var(--fs-sm);text-transform:none;letter-spacing:normal;
  color:var(--muted);font-weight:500;align-items:end}

/* Undo bar: sits under a repeating-row list after a row is removed */
.undo-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
  margin-top:8px;padding:8px 12px;background:var(--surface-2);border:1px solid var(--border);
  border-radius:var(--r-panel);color:var(--muted);font-size:var(--fs-sm)}
.undo-bar[hidden]{display:none}
.undo-bar .undo-text{min-width:0;overflow-wrap:anywhere}
/* a temporary control never belongs in a printed document */
@media print{.undo-bar{display:none !important}}

/* Results: the one contained region */
.result{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-panel);padding:var(--pad-panel);
  margin-top:16px;transition:background-color var(--dur) var(--ease)}
.result.changed{background:var(--accent-soft)}
.result .lbl{color:var(--muted);font-size:var(--fs-base);font-weight:500;margin-bottom:0}
.result .big{font-size:var(--fs-3xl);font-weight:600;letter-spacing:-.01em;font-variant-numeric:tabular-nums lining-nums;line-height:1.15;margin-top:2px}
.kv{display:flex;justify-content:space-between;gap:12px;padding:8px 0;border-bottom:1px solid var(--border);font-size:var(--fs-base)}
.kv:last-child{border-bottom:0}
.kv .v{font-weight:600;font-variant-numeric:tabular-nums lining-nums;text-align:right}

/* Tables: hairlines only, one cell spec */
table{width:100%;border-collapse:collapse;margin:12px 0}
th,td{text-align:left;padding:8px 12px;border-bottom:1px solid var(--border);font-size:var(--fs-base);
  line-height:1.5;vertical-align:top}
th{color:var(--muted);font-weight:500}
td.r,th.r{text-align:right;font-variant-numeric:tabular-nums lining-nums}
.numeric td{line-height:1.35}
.winner{color:var(--good);font-weight:600}
.facts{max-width:76ch}
.facts th{width:24%}
@media (max-width:640px){
  /* narrower gutters so a four-column data table still fits inside a result panel */
  th,td{padding:8px 6px}
  th:first-child,td:first-child{padding-left:0}
  th:last-child,td:last-child{padding-right:0}
  .facts,.facts tbody,.facts tr,.facts th,.facts td{display:block;width:100%}
  .facts th{border-bottom:0;padding-bottom:2px}
  .facts td{padding-top:0;padding-bottom:14px}
  .facts tr{border-bottom:1px solid var(--border)}
}

/* Notes and callouts: full hairline borders on a tinted ground */
.note{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--r-panel);
  padding:var(--pad-panel);margin:24px 0;font-size:var(--fs-base)}
.rec-box{background:var(--accent-soft);border:1px solid var(--accent-line);border-radius:var(--r-panel);
  padding:var(--pad-panel);margin:24px 0}
.note:last-child,.rec-box:last-child{margin-bottom:0}
.rec-box .tag{font-size:var(--fs-sm);font-weight:500;color:var(--muted)}
.rec-box p{margin:.35em 0 0}
.adslot{margin:16px 0}
.tag-pill{display:inline-block;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--r-control);
  padding:2px 8px;font-size:var(--fs-sm);color:var(--muted);margin:2px 6px 2px 0}

/* Prose */
.prose{max-width:64ch}
.container.prose{max-width:var(--maxw)}
.container.prose>*{max-width:64ch}
.prose ul,.prose ol{padding-left:1.25em}
.prose li{margin:.35em 0}
.prose li::marker{color:var(--muted)}

/* FAQ: dividers, not boxes */
details{border-top:1px solid var(--border);padding:0}
details:last-of-type{border-bottom:1px solid var(--border)}
details summary{cursor:pointer;font-weight:500;padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";color:var(--muted);font-weight:400;flex:none;transition:color var(--dur) var(--ease)}
details[open] summary::after{content:"\2212"}
details p{margin:0 0 14px;color:var(--text)}

/* Footer */
.site-footer{border-top:1px solid var(--border);background:var(--surface);margin-top:48px;padding:32px 0 28px;color:var(--muted);font-size:var(--fs-base)}
.site-footer .cols{display:flex;flex-wrap:wrap;gap:32px;justify-content:space-between}
.site-footer a{color:var(--muted)}
.site-footer a:hover{color:var(--text)}
.site-footer h4{color:var(--text);font-size:var(--fs-base);font-weight:500;margin:0 0 10px}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin:6px 0}
.site-footer .brand{font-size:var(--fs-md)}
.disc{margin-top:20px;font-size:var(--fs-sm);color:var(--muted)}

/* Comfort targets on touch pointers only; desktop density is untouched */
@media (pointer:coarse){
  .btn{min-height:44px}
  .btn.small{min-height:40px;padding:8px 14px}
  input[type=text],input[type=number],input[type=date],input[type=time],input[type=email],input[type=file],select,textarea{min-height:44px}
  .lineitem .x,.trow .x{height:44px;min-width:44px}
}