/* =========================================================
   CASAdvisory — Design System
   Pure black/white, serif display + sans body, generous space.
   ========================================================= */

:root{
  --c-ink: #0a0a0a;
  --c-ink-2: #1f1f1f;
  --c-ink-3: #2b2b2b;
  --c-mute: #6a6a6a;
  --c-mute-2: #8c8c8c;
  --c-line: #e5e5e5;
  --c-line-2: #ececec;
  --c-bg: #ffffff;
  --c-bg-soft: #fafafa;
  --c-bg-invert: #0a0a0a;
  --c-on-invert: #ffffff;
  --c-on-invert-mute: #b8b8b8;

  --f-display: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --f-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --f-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --w-container: 1200px;
  --w-prose: 720px;
  --r-sm: 4px;
  --r-md: 6px;

  --shadow-1: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.04);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--f-body);
  color:var(--c-ink);
  background:var(--c-bg);
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
hr{border:0;border-top:1px solid var(--c-line);margin:48px 0}

/* ---------- Typography ---------- */
h1,h2,h3,h4{font-family:var(--f-display);font-weight:600;letter-spacing:-0.01em;color:var(--c-ink);margin:0 0 .6em}
h1{font-size:clamp(34px,5vw,56px);line-height:1.08}
h2{font-size:clamp(26px,3.4vw,38px);line-height:1.15}
h3{font-size:clamp(20px,2vw,24px);line-height:1.25}
h4{font-size:18px;line-height:1.35}
p{margin:0 0 1em}
.eyebrow{font-family:var(--f-body);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--c-mute);font-weight:600;margin:0 0 16px}
.lede{font-size:clamp(18px,1.7vw,21px);line-height:1.55;color:var(--c-ink-2);max-width:640px}
.muted{color:var(--c-mute)}
strong{font-weight:600;color:var(--c-ink)}
.serif{font-family:var(--f-display)}

/* ---------- Layout ---------- */
.container{max-width:var(--w-container);margin:0 auto;padding:0 24px}
.container-prose{max-width:var(--w-prose);margin:0 auto;padding:0 24px}
section{padding:88px 0}
section.tight{padding:56px 0}
.section-head{max-width:760px;margin-bottom:48px}
.section-head .lede{margin-top:8px}

.row{display:grid;gap:32px}
.row-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.row-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.row-4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:900px){.row-2,.row-3,.row-4{grid-template-columns:1fr}}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--c-line);
}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{height:36px;width:auto;display:block}
.site-footer .brand-mark{filter:brightness(0) invert(1);height:32px}
@media (max-width:560px){.brand-mark{height:30px} .brand-text{display:none}}
.brand-text{display:flex;flex-direction:column;line-height:1;font-family:var(--f-display)}
.brand-text .b1{font-size:19px;letter-spacing:-.01em;font-weight:600}
.brand-text .b2{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--c-mute);margin-top:4px;font-family:var(--f-body)}

.nav{display:flex;align-items:center;gap:32px}
.nav a{font-size:14.5px;color:var(--c-ink-2);position:relative;padding:6px 0}
.nav a:hover{color:var(--c-ink)}
.nav a.active{color:var(--c-ink)}
.nav a.active::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:1px;background:var(--c-ink)}
.nav-cta{margin-left:8px}
.nav-toggle{display:none;background:none;border:1px solid var(--c-line);width:40px;height:40px;border-radius:var(--r-sm);cursor:pointer;align-items:center;justify-content:center}
.nav-toggle span{display:block;width:18px;height:1.5px;background:var(--c-ink);position:relative}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:18px;height:1.5px;background:var(--c-ink)}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}

@media (max-width:880px){
  .nav-toggle{display:flex}
  .nav{position:fixed;inset:72px 0 auto 0;background:#fff;border-bottom:1px solid var(--c-line);flex-direction:column;align-items:flex-start;gap:0;padding:8px 24px 16px;display:none}
  .nav.open{display:flex}
  .nav a{padding:14px 0;width:100%;border-bottom:1px solid var(--c-line-2)}
  .nav .nav-cta{margin:12px 0 0}
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  height:46px;padding:0 22px;
  font-family:var(--f-body);font-size:14.5px;font-weight:500;letter-spacing:.01em;
  border-radius:var(--r-sm);
  cursor:pointer;border:1px solid transparent;transition:all .18s ease;
}
.btn-primary{background:var(--c-ink);color:#fff;border-color:var(--c-ink)}
.btn-primary:hover{background:#000}
.btn-ghost{background:transparent;color:var(--c-ink);border-color:var(--c-ink)}
.btn-ghost:hover{background:var(--c-ink);color:#fff}
.btn-link{background:transparent;border:0;padding:0;height:auto;color:var(--c-ink);text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px}
.btn-link:hover{text-decoration-thickness:2px}
.btn-sm{height:38px;padding:0 16px;font-size:13.5px}
.btn-arrow::after{content:" \2192";margin-left:6px;display:inline-block;transition:transform .15s}
.btn-arrow:hover::after{transform:translateX(3px)}

/* ---------- Hero ---------- */
.hero{padding:110px 0 96px;border-bottom:1px solid var(--c-line)}
.hero .container{display:grid;grid-template-columns:1.15fr .85fr;gap:64px;align-items:end}
.hero h1{margin-bottom:24px}
.hero .lede{font-size:clamp(19px,1.8vw,22px);max-width:560px}
.hero .actions{display:flex;gap:14px;margin-top:36px;flex-wrap:wrap}
.hero-side{align-self:end}
.hero-meta{border-left:1px solid var(--c-line);padding-left:28px}
.hero-meta dt{font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--c-mute);font-weight:600;margin-bottom:6px}
.hero-meta dd{margin:0 0 22px;font-family:var(--f-display);font-size:18px;color:var(--c-ink-2);line-height:1.4}
@media (max-width:900px){.hero{padding:72px 0 64px} .hero .container{grid-template-columns:1fr;gap:40px} .hero-meta{border-left:0;border-top:1px solid var(--c-line);padding:24px 0 0}}

/* ---------- Cards / Tiles ---------- */
.card{
  background:#fff;border:1px solid var(--c-line);border-radius:var(--r-md);
  padding:32px;height:100%;display:flex;flex-direction:column;
  transition:border-color .18s, transform .18s;
}
.card:hover{border-color:var(--c-ink-3)}
.card .num{font-family:var(--f-display);font-size:14px;color:var(--c-mute);margin-bottom:12px;letter-spacing:.04em}
.card h3{margin-bottom:10px}
.card p{color:var(--c-ink-2);font-size:15.5px;margin:0}
.card .more{margin-top:auto;padding-top:22px;font-size:13.5px;font-weight:500}

/* Service-card icon (top of each card on the home page) */
.svc-icon{
  display:flex;align-items:center;justify-content:flex-start;
  width:44px;height:44px;
  margin:0 0 22px;
  color:var(--c-ink);
}
.svc-icon svg{width:38px;height:38px;display:block}
.card .num{margin-top:0}

/* Service tile (numbered, dense) */
.tile-list{display:grid;gap:0;border-top:1px solid var(--c-line)}
.tile{
  padding:36px 0;border-bottom:1px solid var(--c-line);
  display:grid;grid-template-columns:80px 1.1fr 1.6fr;gap:32px;align-items:start;
}
.tile .t-num{font-family:var(--f-display);color:var(--c-mute);font-size:18px;padding-top:6px}
.tile h3{margin-bottom:0}
.tile p{color:var(--c-ink-2);margin:0}
.tile ul{margin:12px 0 0;padding:0;list-style:none}
.tile ul li{position:relative;padding:6px 0 6px 22px;color:var(--c-ink-2);font-size:15px;border-top:1px dashed var(--c-line-2)}
.tile ul li:first-child{border-top:0}
.tile ul li::before{content:"";position:absolute;left:0;top:14px;width:10px;height:1px;background:var(--c-ink)}
@media (max-width:900px){.tile{grid-template-columns:1fr;gap:14px} .tile .t-num{padding-top:0}}

/* ---------- Stats strip ---------- */
.stats{background:var(--c-bg-invert);color:var(--c-on-invert)}
.stats h2,.stats h3,.stats p,.stats .eyebrow,.stats .muted{color:#fff}
.stats .eyebrow{color:var(--c-on-invert-mute)}
.stat{padding:8px 0}
.stat .n{font-family:var(--f-display);font-size:clamp(36px,4.4vw,52px);line-height:1;letter-spacing:-.02em;font-weight:600}
.stat .l{margin-top:14px;color:var(--c-on-invert-mute);font-size:14px;line-height:1.5;max-width:240px}
.stats hr{border-color:#222;margin:48px 0}

/* ---------- Process / steps ---------- */
.steps{counter-reset:s}
.step{counter-increment:s;padding:28px 0;border-top:1px solid var(--c-line);display:grid;grid-template-columns:auto 1fr;gap:24px;align-items:start}
.step::before{content:counter(s,decimal-leading-zero);font-family:var(--f-display);font-size:34px;color:var(--c-mute);min-width:56px}
.step h3{margin-bottom:6px}
.step p{margin:0;color:var(--c-ink-2)}

/* ---------- Quote / pull ---------- */
.pull{
  border-left:2px solid var(--c-ink);padding:8px 0 8px 24px;
  font-family:var(--f-display);font-size:clamp(20px,2vw,26px);line-height:1.4;color:var(--c-ink);
}

/* ---------- Forms ---------- */
.form-card{
  background:#fff;border:1px solid var(--c-line);border-radius:var(--r-md);
  padding:40px;box-shadow:var(--shadow-1);
}
.field{display:block;margin-bottom:22px}
.field label{display:block;font-size:13px;color:var(--c-ink-2);margin-bottom:8px;font-weight:500;letter-spacing:.02em}
.field input, .field select, .field textarea{
  width:100%;padding:12px 14px;border:1px solid var(--c-line);border-radius:var(--r-sm);
  font-family:var(--f-body);font-size:15px;background:#fff;color:var(--c-ink);transition:border-color .15s;
}
.field input:focus, .field select:focus, .field textarea:focus{outline:none;border-color:var(--c-ink)}
.field textarea{min-height:140px;resize:vertical}
.field .hint{font-size:12px;color:var(--c-mute);margin-top:6px}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:600px){.field-row{grid-template-columns:1fr}}
.consent{display:flex;align-items:flex-start;gap:10px;font-size:13px;color:var(--c-mute);margin-bottom:24px}
.consent input{margin-top:3px}

/* ---------- Insights / blog ---------- */
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
@media (max-width:980px){.post-grid{grid-template-columns:1fr 1fr}}
@media (max-width:680px){.post-grid{grid-template-columns:1fr}}
.post-card{display:flex;flex-direction:column;border-top:1px solid var(--c-ink);padding-top:22px;height:100%}
.post-meta{display:flex;gap:12px;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--c-mute);margin-bottom:14px}
.post-card h3{font-size:22px;line-height:1.25;margin-bottom:12px}
.post-card .excerpt{color:var(--c-ink-2);font-size:15px;margin:0 0 18px}
.post-card .read{margin-top:auto;font-size:14px;font-weight:500}

/* Long-form article */
.article-header{padding:80px 0 32px;border-bottom:1px solid var(--c-line)}
.article-header .meta{display:flex;gap:16px;font-size:13px;letter-spacing:.04em;color:var(--c-mute);margin-bottom:16px}
.article-header h1{max-width:880px;font-size:clamp(30px,4vw,46px)}
.article-header .lede{margin-top:18px;max-width:760px}
.article-body{padding:48px 0 80px}
.article-body h2{margin-top:48px}
.article-body h3{margin-top:32px}
.article-body p, .article-body li{color:var(--c-ink-2)}
.article-body ul, .article-body ol{padding-left:22px;margin:0 0 1.2em}
.article-body li{margin:0 0 .5em}
.article-body blockquote{margin:32px 0;padding:0 0 0 24px;border-left:2px solid var(--c-ink);font-family:var(--f-display);font-size:20px;color:var(--c-ink)}
.article-body table{width:100%;border-collapse:collapse;margin:24px 0;font-size:15px}
.article-body th,.article-body td{padding:12px 14px;border-bottom:1px solid var(--c-line);text-align:left;vertical-align:top}
.article-body th{background:var(--c-bg-soft);font-weight:600;color:var(--c-ink)}
.article-cta{background:var(--c-bg-soft);border:1px solid var(--c-line);border-radius:var(--r-md);padding:32px;margin:48px 0;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.article-cta p{margin:0;font-family:var(--f-display);font-size:19px;max-width:520px}

/* Filter chips */
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:32px}
.chip{font-size:12.5px;letter-spacing:.04em;text-transform:uppercase;border:1px solid var(--c-line);padding:8px 14px;border-radius:999px;color:var(--c-ink-2);cursor:pointer;background:#fff}
.chip.is-active{background:var(--c-ink);color:#fff;border-color:var(--c-ink)}

/* ---------- Footer ---------- */
.site-footer{background:var(--c-bg-invert);color:var(--c-on-invert);padding:72px 0 36px;margin-top:96px}
.site-footer .grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
@media (max-width:900px){.site-footer .grid{grid-template-columns:1fr 1fr;gap:32px}}
@media (max-width:560px){.site-footer .grid{grid-template-columns:1fr}}
.site-footer h4{color:#fff;font-family:var(--f-body);font-size:12px;letter-spacing:.18em;text-transform:uppercase;margin:0 0 16px;font-weight:600}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin:0 0 10px}
.site-footer a{color:var(--c-on-invert-mute);font-size:14.5px}
.site-footer a:hover{color:#fff}
.site-footer .brand-text .b1, .site-footer .brand-text .b2{color:#fff}
.site-footer .brand-text .b2{color:var(--c-on-invert-mute)}
.foot-tag{color:var(--c-on-invert-mute);font-size:14px;line-height:1.6;max-width:340px;margin-top:18px}
.foot-base{display:flex;justify-content:space-between;align-items:center;border-top:1px solid #222;margin-top:48px;padding-top:24px;font-size:13px;color:var(--c-on-invert-mute);flex-wrap:wrap;gap:12px}

/* ---------- Misc ---------- */
.kbar{display:inline-flex;align-items:center;gap:10px;padding:6px 12px;border:1px solid var(--c-line);border-radius:999px;font-size:12.5px;letter-spacing:.04em;color:var(--c-ink-2);background:#fff}
.kbar::before{content:"";width:6px;height:6px;background:var(--c-ink);border-radius:50%}
.callout{border:1px solid var(--c-line);border-radius:var(--r-md);padding:24px 28px;background:var(--c-bg-soft)}
.callout h4{margin:0 0 8px;font-family:var(--f-display);font-size:18px}
.callout p{margin:0;font-size:15px;color:var(--c-ink-2)}

.skip{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip:focus{position:fixed;left:16px;top:16px;width:auto;height:auto;background:#000;color:#fff;padding:10px 14px;z-index:100;border-radius:var(--r-sm)}

/* ---------- Editorial sector entries (sectors page) ---------- */
.sector-group{margin-bottom:56px}
.sector-group:last-child{margin-bottom:0}
.sector-group-head{
  display:flex;align-items:baseline;gap:24px;
  padding-bottom:18px;margin-bottom:0;
  border-bottom:1px solid var(--c-ink);
}
.sector-group-head .label{
  font-family:var(--f-body);font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--c-ink);font-weight:600;white-space:nowrap;
}
.sector-group-head .desc{
  font-family:var(--f-display);font-size:17px;color:var(--c-mute);font-style:italic;margin:0;
}
.sector-list{display:grid;grid-template-columns:1fr 1fr;gap:0}
@media (max-width:880px){.sector-list{grid-template-columns:1fr}}
.sector-entry{
  padding:32px 32px 32px 0;
  border-bottom:1px solid var(--c-line);
}
.sector-entry:nth-child(odd){padding-right:32px;border-right:1px solid var(--c-line)}
.sector-entry:nth-child(even){padding-left:32px}
@media (max-width:880px){
  .sector-entry,.sector-entry:nth-child(odd),.sector-entry:nth-child(even){
    padding:28px 0;border-right:0;
  }
}
.sector-entry h3{
  font-family:var(--f-display);font-size:22px;line-height:1.25;margin:0 0 12px;
}
.sector-entry .body{color:var(--c-ink-2);font-size:15.5px;line-height:1.6;margin:0}
.sector-entry .engagement{
  margin:18px 0 0;padding-top:14px;border-top:1px dashed var(--c-line-2);
  font-family:var(--f-display);font-style:italic;font-size:14.5px;color:var(--c-mute);
}
.sector-entry .engagement em{font-style:normal;color:var(--c-ink);font-family:var(--f-body);
  font-size:11.5px;letter-spacing:.18em;text-transform:uppercase;font-weight:600;
  display:block;margin-bottom:6px;font-style:normal;
}

/* Small screens spacing */
@media (max-width:600px){
  section{padding:64px 0}
  .form-card{padding:28px}
  .article-header{padding:56px 0 24px}
  .article-body{padding:32px 0 56px}
}