/* SpendTower shared shell.
   Tokens, reset, navigation, footer, buttons, and document-page typography.
   Page-specific layout stays inline in each page's <style> block. */

:root{
  /* Precision Ink palette, per docs/brand.md */
  --ink:#0B1220;
  --ink2:#0f1a2b;
  --ink3:#16263c;
  --slate:#334155;
  --muted:#5B6B7F;
  --paper:#F8FAFC;
  --line:#E2E8F0;
  --line-soft:#EDF1F6;
  --cyan:#06B6D4;
  --cyan-d:#04212a;
  --cyan-deep:#0E7490;
  --amber:#F59E0B;
  --amber-deep:#B45309;
  --red:#EF4444;
  --red-deep:#B91C1C;
  --green:#10B981;
  --green-deep:#047857;

  /* on dark */
  --d-text:#E5EDF5;
  --d-dim:#A3B4C6;
  --d-faint:#8398AE;
  --d-line:rgba(255,255,255,.09);
  --d-line2:rgba(255,255,255,.17);

  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,"SF Mono","JetBrains Mono","Roboto Mono",Menlo,Consolas,monospace;

  --wrap:1120px;
  --nav-h:64px;
}

*{box-sizing:border-box}

html{
  scroll-behavior:smooth;
  /* sticky nav must not cover the heading an anchor jumps to */
  scroll-padding-top:calc(var(--nav-h) + 16px);
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  font-family:var(--sans);
  color:var(--ink);
  background:#fff;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

a{color:inherit}

img,svg{max-width:100%}

/* Numerals read as data: fixed width so columns line up. */
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}
.num{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}

/* ---------- accessibility ---------- */

.skip{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--cyan);color:var(--cyan-d);
  font-weight:700;font-size:14px;padding:12px 18px;border-radius:0 0 10px 0;
  text-decoration:none;
}
.skip:focus{left:0}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:4px;
}
/* dark surfaces need a brighter ring to stay visible */
.nav :focus-visible,.foot :focus-visible,.onDark :focus-visible{
  outline-color:#67E8F9;
}

.vh{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}

/* ---------- type helpers ---------- */

.kicker{
  font-family:var(--mono);font-size:11.5px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--cyan-deep);
  margin:0 0 10px;
}
.onDark .kicker,.kicker.onDark{color:var(--cyan)}

h1,h2,h3,h4{letter-spacing:-.02em;margin:0}
.h2{font-size:clamp(24px,3.2vw,32px);font-weight:800;line-height:1.15;margin:0 0 12px}
.lede{color:var(--slate);font-size:16px;margin:0;max-width:62ch}
.onDark .lede{color:var(--d-dim)}

/* ---------- buttons ---------- */

.btn{
  font-family:inherit;font-weight:700;font-size:14px;line-height:1;
  border-radius:10px;padding:13px 18px;border:1px solid transparent;
  cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;
  gap:8px;justify-content:center;
  transition:transform .06s ease,background-color .15s ease,border-color .15s ease,color .15s ease;
}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--cyan);color:var(--cyan-d)}
.btn.primary:hover{background:#22D3EE}
.btn.dark{background:var(--ink);color:#fff}
.btn.dark:hover{background:var(--ink3)}
.btn.outline{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.outline:hover{background:var(--paper);border-color:#CBD5E1}
/* ghost sits on dark backgrounds */
.btn.ghost{background:transparent;color:#D7E3EE;border-color:var(--d-line2)}
.btn.ghost:hover{background:rgba(255,255,255,.07);color:#fff}
.btn.sm{padding:10px 14px;font-size:13px}

/* ---------- navigation ---------- */

.nav{
  position:sticky;top:0;z-index:60;
  background:rgba(11,18,32,.88);
  backdrop-filter:blur(10px);
  border-bottom:1px solid transparent;
  transition:background-color .2s ease,border-color .2s ease;
}
.nav.solid{background:rgba(11,18,32,.97);border-bottom-color:var(--d-line)}
.nav .in{
  display:flex;align-items:center;gap:20px;
  height:var(--nav-h);
}
.wm{
  font-weight:800;font-size:18px;color:#fff;letter-spacing:-.025em;
  display:flex;align-items:center;gap:9px;text-decoration:none;flex:none;
}
.wm .thin{font-weight:400;color:#B9CADA}
.navlinks{display:flex;align-items:center;gap:4px;margin-left:8px}
.navlinks a{
  font-size:13.5px;font-weight:600;color:#B9CADA;text-decoration:none;
  padding:8px 11px;border-radius:8px;transition:color .15s ease,background-color .15s ease;
}
.navlinks a:hover{color:#fff;background:rgba(255,255,255,.06)}
.navcta{display:flex;align-items:center;gap:9px;margin-left:auto}

@media(max-width:880px){
  .navlinks{display:none}
  .navcta .btn.ghost{display:none}
}

/* ---------- footer ---------- */

.foot{background:var(--ink);color:var(--d-dim);padding:52px 0 28px;font-size:13.5px}
.foot .cols{
  display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:32px;
  padding-bottom:32px;border-bottom:1px solid var(--d-line);
}
@media(max-width:760px){.foot .cols{grid-template-columns:1fr 1fr;gap:28px}}
@media(max-width:420px){.foot .cols{grid-template-columns:1fr}}
.foot .about p{margin:12px 0 0;color:var(--d-faint);max-width:34ch;font-size:13px}
.foot h2{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--d-faint);margin:0 0 12px;font-weight:500;
}
.foot ul{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.foot ul a{color:var(--d-dim);text-decoration:none}
.foot ul a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}
.foot .base{
  display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;
  padding-top:22px;color:var(--d-faint);font-size:12.5px;
}
.foot .base .mono{font-size:11.5px;letter-spacing:.02em}

/* ---------- accordion (native details) ---------- */

.qa{border-top:1px solid var(--line)}
.qa:last-of-type{border-bottom:1px solid var(--line)}
.qa summary{
  list-style:none;cursor:pointer;display:flex;align-items:flex-start;gap:16px;
  padding:20px 0;font-weight:700;font-size:16px;letter-spacing:-.01em;
}
.qa summary::-webkit-details-marker{display:none}
.qa summary:hover{color:var(--cyan-deep)}
.qa .sign{
  flex:none;width:20px;height:20px;margin-top:2px;position:relative;
  color:var(--cyan-deep);
}
.qa .sign::before,.qa .sign::after{
  content:"";position:absolute;background:currentColor;border-radius:2px;
  top:9px;left:3px;width:14px;height:2px;transition:transform .18s ease;
}
.qa .sign::after{transform:rotate(90deg)}
.qa[open] .sign::after{transform:rotate(0deg)}
.qa .answer{padding:0 0 22px 36px;color:var(--slate);font-size:15px;max-width:70ch}
.qa .answer p{margin:0 0 10px}
.qa .answer p:last-child{margin-bottom:0}
.qa .answer ul{margin:10px 0;padding-left:20px}
.qa .answer li{margin-bottom:6px}
@media(max-width:600px){
  .qa summary{font-size:15px;gap:12px}
  .qa .answer{padding-left:32px}
}

/* ---------- document pages (privacy, terms, faq) ---------- */

.dochead{
  background:linear-gradient(180deg,var(--ink) 0%,#0d1728 100%);
  color:var(--d-text);padding:48px 0 40px;
}
.dochead h1{color:#fff;font-size:clamp(28px,4vw,38px);font-weight:800;margin:0 0 12px}
.dochead p{color:var(--d-dim);margin:0;max-width:62ch;font-size:16px}
.dochead .stamp{
  font-family:var(--mono);font-size:11.5px;color:var(--d-faint);
  margin-top:18px;padding-top:16px;border-top:1px solid var(--d-line);
  display:flex;gap:22px;flex-wrap:wrap;
}

.doclayout{
  display:grid;grid-template-columns:216px 1fr;gap:52px;
  max-width:var(--wrap);margin:0 auto;padding:44px 24px 80px;
}
@media(max-width:900px){.doclayout{grid-template-columns:1fr;gap:0;padding-top:32px}}

.toc{align-self:start;position:sticky;top:calc(var(--nav-h) + 24px)}
@media(max-width:900px){
  .toc{
    position:static;margin-bottom:32px;padding:18px 20px;
    background:var(--paper);border:1px solid var(--line);border-radius:12px;
  }
}
.toc h2{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);margin:0 0 14px;font-weight:500;
}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:toc;display:grid;gap:2px}
.toc li{counter-increment:toc}
.toc a{
  display:flex;gap:10px;text-decoration:none;color:var(--slate);font-size:13.5px;
  padding:6px 8px;border-radius:7px;line-height:1.4;
}
.toc a::before{
  content:counter(toc,decimal-leading-zero);
  font-family:var(--mono);font-size:11px;color:#94A3B8;flex:none;padding-top:1px;
}
.toc a:hover{background:var(--paper);color:var(--ink)}

.doc{max-width:72ch;min-width:0}
.doc h2{
  font-size:20px;font-weight:800;margin:40px 0 12px;
  padding-top:22px;border-top:1px solid var(--line-soft);
}
.doc > h2:first-child{margin-top:0;padding-top:0;border-top:0}
.doc h3{font-size:15.5px;font-weight:700;margin:24px 0 8px}
.doc p{margin:0 0 14px;color:var(--slate);font-size:15.5px}
.doc ul,.doc ol{margin:0 0 16px;padding-left:22px;color:var(--slate);font-size:15.5px}
.doc li{margin-bottom:8px}
.doc li::marker{color:#94A3B8}
.doc strong{color:var(--ink)}
.doc a{color:var(--cyan-deep);text-underline-offset:2px}
.doc a:hover{color:var(--ink)}
.doc table{width:100%;border-collapse:collapse;font-size:14px;margin:0 0 18px}
.doc th{
  text-align:left;font-family:var(--mono);font-size:10px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--muted);font-weight:500;
  padding:9px 10px;border-bottom:1px solid var(--line);
}
.doc td{padding:11px 10px;border-bottom:1px solid var(--line-soft);color:var(--slate);vertical-align:top}
.doc td:first-child{color:var(--ink);font-weight:600}

/* A short callout for the things a reader should not skim past. */
.note{
  border-left:3px solid var(--cyan);background:var(--paper);
  padding:16px 18px;border-radius:0 10px 10px 0;margin:0 0 18px;
}
.note p{margin:0;font-size:14.5px}
.note.warn{border-left-color:var(--amber);background:rgba(245,158,11,.07)}

.docfoot{
  margin-top:44px;padding-top:22px;border-top:1px solid var(--line);
  display:flex;gap:14px;flex-wrap:wrap;align-items:center;
  font-size:14px;color:var(--muted);
}

@media print{
  .nav,.foot,.toc,.skip,.docfoot{display:none}
  .doclayout{display:block;padding:0}
  .dochead{background:none;color:#000;padding:0 0 20px}
  .dochead h1,.dochead p,.dochead .stamp{color:#000}
  .doc{max-width:none}
  .qa .answer{display:block}
}