/* LOOK B: modern and soft.
   Clean sans-serif headings, rounded white panels on a cool grey ground,
   gentle shadows and small icon tiles.
   One file, no build step, no JavaScript. Light and dark follow the device. */

:root{
  --paper:#F7F9FC;
  --card:#FFFFFF;
  --panel:#F1F5FF;
  --ink:#0F172A;
  --muted:#5B6577;
  --line:#E7ECF3;
  --accent:#1B4FD8;
  --accent-ink:#12379C;
  --accent-soft:#EEF3FF;
  --on-accent:#FFFFFF;
  --art-1:#DDE7FF;
  --art-2:#EEF3FF;
  --art-3:#C6D6FF;
  --radius:20px;
  --sh-1:0 1px 2px rgba(15,23,42,.05), 0 14px 34px -22px rgba(15,23,42,.28);
  --sh-2:0 1px 2px rgba(15,23,42,.06), 0 22px 50px -26px rgba(15,23,42,.3);
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root{
    --paper:#0B0F15;
    --card:#131922;
    --panel:#101827;
    --ink:#E9EDF5;
    --muted:#9CA6B7;
    --line:#1F2735;
    --accent:#8FB0FF;
    --accent-ink:#BBD0FF;
    --accent-soft:#182338;
    --on-accent:#0B1017;
    --art-1:#1B2942;
    --art-2:#16213A;
    --art-3:#22335A;
    --sh-1:0 1px 2px rgba(0,0,0,.35), 0 14px 34px -22px rgba(0,0,0,.6);
    --sh-2:0 1px 2px rgba(0,0,0,.4), 0 22px 50px -26px rgba(0,0,0,.7);
    color-scheme:dark;
  }
}

*,*::before,*::after{box-sizing:border-box}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:1.0625rem;
  line-height:1.65;
  -webkit-text-size-adjust:100%;
}
img,svg{max-width:100%}
a{color:var(--accent);text-underline-offset:2px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}
.skip{position:absolute;left:-9999px;top:0;background:var(--card);color:var(--ink);padding:10px 16px;border-radius:0 0 10px 0;z-index:5}
.skip:focus{left:0}
.wrap{max-width:68rem;margin-inline:auto;padding-inline:20px}

/* header */
.site-head{background:var(--card);border-bottom:1px solid var(--line)}
.head-row{display:flex;align-items:center;justify-content:space-between;gap:14px 22px;flex-wrap:wrap;padding-block:15px}
.brand{display:inline-flex;align-items:center;gap:9px;font-size:1.16rem;font-weight:700;letter-spacing:-.01em;color:var(--ink);text-decoration:none}
.brand svg{color:var(--accent)}
.site-nav ul{list-style:none;display:flex;flex-wrap:wrap;gap:6px 22px;margin:0;padding:0}
.site-nav a{font-size:.97rem;font-weight:500;color:var(--muted);text-decoration:none}
.site-nav a:hover{color:var(--accent);text-decoration:underline}
.site-nav a[aria-current="page"]{color:var(--accent);font-weight:600}

/* hero as a raised panel */
.hero{padding-block:26px 0}
.hero .wrap{
  background:var(--card);border:1px solid var(--line);border-radius:26px;
  box-shadow:var(--sh-2);
  padding-inline:clamp(20px,4vw,44px);
  padding-block:44px 46px;
}
.hero-slim .wrap{padding-block:34px 36px}
.hero-grid{display:grid;gap:30px;align-items:center}
@media (min-width:900px){
  .hero-grid{grid-template-columns:1.15fr .85fr;gap:52px}
}
.hero-copy{max-width:36rem}
.hero-art{display:none}
@media (min-width:900px){
  .hero-art{display:block}
  .hero-art svg{width:100%;height:auto;display:block}
  .art-1{fill:var(--art-1)}
  .art-2{fill:var(--art-2)}
  .art-3{fill:var(--art-3)}
}

/* type: all sans, tight and clean */
h1,h2,h3,h4{font-family:var(--sans);line-height:1.18;margin:0;letter-spacing:-.018em;text-wrap:balance}
h1{font-size:clamp(1.9rem,1.15rem + 2.6vw,2.9rem);font-weight:700}
h2{font-size:clamp(1.35rem,1.1rem + .9vw,1.75rem);font-weight:700;margin-top:44px}
h3{font-size:1.16rem;font-weight:650;margin-top:30px}
h4{font-size:1.02rem;font-weight:650;margin-top:24px}
p{margin:14px 0 0}
ul,ol{margin:14px 0 0;padding-left:1.3em}
/* stacked spacing applies to article lists only, never to menus */
.prose li+li,.kp li+li{margin-top:7px}
.site-nav li+li,.site-foot nav li+li,.crumbs li+li,.icon-list li+li{margin-top:0}
.site-nav ul{align-items:center}
.site-foot nav ul{align-items:center}
.eyebrow{font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin:0}
.lede{font-size:1.16rem;line-height:1.6;color:var(--muted)}
.hero .lede{max-width:33rem}
.meta{font-size:.9rem;color:var(--muted)}

/* buttons */
.btn{display:inline-block;background:var(--accent);color:var(--on-accent);font-weight:600;font-size:.98rem;text-decoration:none;padding:12px 20px;border-radius:999px;box-shadow:0 10px 24px -14px rgba(27,79,216,.75)}
.btn:hover{text-decoration:underline}
.btn.ghost{background:var(--card);border:1px solid var(--line);color:var(--ink);box-shadow:none}
.btn.ghost:hover{border-color:var(--accent);color:var(--accent)}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}

/* sections */
.block{padding-block:44px 0}
.band{margin-top:56px}
.band > .wrap{background:var(--panel);border-radius:26px;padding-inline:clamp(20px,4vw,44px);padding-block:42px 46px}
.band .eyebrow{margin-bottom:6px}

/* cards */
.cards{display:grid;grid-template-columns:1fr;gap:20px;margin-top:22px}
@media (min-width:760px){.cards{grid-template-columns:1fr 1fr}}
.card{display:flex;flex-direction:column;gap:9px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px 24px 20px;box-shadow:var(--sh-1)}
.card:hover{border-color:var(--accent);box-shadow:var(--sh-2)}
.card .tag{font-size:.74rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}
.card h3{margin:0;font-size:1.22rem}
.card h3 a{color:var(--ink);text-decoration:none}
.card h3 a:hover{color:var(--accent);text-decoration:underline}
.card p{margin:0;color:var(--muted)}
.card .meta{margin-top:auto;padding-top:8px}

/* recommendation box */
.reco{background:var(--card);border:1px solid var(--line);border-left:5px solid var(--accent);border-radius:var(--radius);padding:26px 26px 22px;box-shadow:var(--sh-1)}
.block > .reco{max-width:52rem}
.reco .why{font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin:0}
.reco h2,.reco h3{margin-top:8px}
.reco .publisher{margin-top:18px;padding-top:12px;border-top:1px solid var(--line);font-size:.82rem;color:var(--muted)}

/* icon list */
.icon-list{list-style:none;margin:22px 0 0;padding:0;display:grid;grid-template-columns:1fr;gap:16px}
@media (min-width:760px){.icon-list{grid-template-columns:1fr 1fr}}
.icon-list li{display:flex;gap:14px;margin:0;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px}
.icon-list .icon{flex:none;width:42px;height:42px;border-radius:13px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center}
.icon-list .icon svg{width:22px;height:22px}
.icon-list div{font-size:.98rem;color:var(--muted)}
.icon-list strong{display:block;color:var(--ink)}

/* breadcrumbs */
.crumbs{margin-bottom:14px}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;margin:0;padding:0;font-size:.88rem;color:var(--muted)}
.crumbs li+li::before{content:"/";margin-inline:9px}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--accent);text-decoration:underline}

/* guide layout */
.layout{display:grid;gap:44px;padding-block:40px 0}
.rail{display:none}
@media (min-width:1000px){
  .layout{grid-template-columns:15.5rem minmax(0,1fr)}
  .rail{display:block;grid-column:1;grid-row:1}
  .rail .jump{position:sticky;top:24px}
  .prose{grid-column:2;grid-row:1}
}
.prose{max-width:44rem}
.prose>p:first-child{margin-top:0}

/* boxes inside prose */
.kp{background:var(--panel);border-left:5px solid var(--accent);border-radius:0 16px 16px 0;padding:20px 22px;margin-top:28px}
.kp .label,.jump .label{font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent-ink);margin:0}
.kp ul{margin-top:10px}
.jump{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px 20px;margin-top:28px;box-shadow:var(--sh-1)}
@media (min-width:1000px){.rail .jump{margin-top:0}}
.jump ul{list-style:none;margin:10px 0 0;padding:0}
.jump li+li{margin-top:6px}
.jump a{text-decoration:none}
.jump a:hover{text-decoration:underline}

/* the ten resources */
.reslist{padding-left:1.5em;margin-top:22px}
.reslist>li{margin-top:26px}
.reslist>li::marker{font-weight:700;color:var(--accent);font-size:1.05em}
.reslist h3{margin:0 0 6px}

.authorbox{margin-top:38px;padding-top:18px;border-top:1px solid var(--line);font-size:.9rem;color:var(--muted)}

/* tables */
.scroll{overflow-x:auto;margin-top:22px}
table{border-collapse:collapse;width:100%;font-size:.97rem}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}

/* footer */
.site-foot{margin-top:64px;border-top:1px solid var(--line);background:var(--card)}
.foot-inner{display:flex;flex-direction:column;gap:12px;padding-block:30px 46px;font-size:.92rem;color:var(--muted)}
.foot-inner .publisher{color:var(--ink);font-weight:600}
.site-foot nav ul{list-style:none;display:flex;flex-wrap:wrap;gap:8px 22px;margin:0;padding:0}
.site-foot a{color:var(--muted)}
.site-foot a:hover{color:var(--accent)}