/* ==========================================================================
   Stearling Connection — design system
   Palette contrast-validated to WCAG AA in both light and dark.
   ========================================================================== */

:root{
  /* surfaces & ink */
  --bg:#fafaf8;
  --surface:#ffffff;
  --surface-2:#f3f2ee;
  --ink:#14171a;
  --ink-soft:#4b5359;
  --ink-faint:#666d74;
  --rule:#e5e3de;
  --rule-strong:#d3d0c9;

  /* brand */
  --accent:#0e4f47;
  --accent-hover:#0a3a34;
  --accent-wash:#e9f1ef;
  --accent-ink:#ffffff;

  /* type */
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --serif:"Newsreader",Georgia,"Times New Roman",serif;

  /* metrics */
  --wide:68rem;
  --text:41rem;
  --r:12px;
  --r-sm:8px;
  --shadow:0 1px 2px rgba(20,23,26,.05), 0 8px 24px -12px rgba(20,23,26,.12);
}

@media (prefers-color-scheme:dark){
  :root{
    --bg:#0e1113;
    --surface:#171a1e;
    --surface-2:#1c2025;
    --ink:#eceff1;
    --ink-soft:#b2b9c0;
    --ink-faint:#89919a;
    --rule:#262a2f;
    --rule-strong:#333940;
    --accent:#67c3b1;
    --accent-hover:#8ad3c4;
    --accent-wash:#14302c;
    --accent-ink:#0b1a17;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.6);
  }
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.62;
  font-feature-settings:"cv05" 1,"ss01" 1;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

.wrap{max-width:var(--wide);margin:0 auto;padding:0 1.75rem}
.narrow{max-width:var(--text);margin-left:0}
.center{max-width:var(--text);margin:0 auto}

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

h1,h2,h3{font-family:var(--serif);font-weight:500;letter-spacing:-.008em;margin:0}
h1{font-size:clamp(2.1rem,4.6vw,3.3rem);line-height:1.1;margin-bottom:1.1rem}
h2{font-size:clamp(1.5rem,2.6vw,2rem);line-height:1.2;margin-bottom:.9rem}
h3{font-size:1.15rem;line-height:1.3;margin-bottom:.45rem}
p{margin:0 0 1.15rem}
a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:2px}
a:hover{color:var(--accent-hover)}
strong{font-weight:600}
.lede{font-size:clamp(1.08rem,1.7vw,1.24rem);line-height:1.55;color:var(--ink-soft);margin-bottom:1.5rem}
.eyebrow{
  font-size:.78rem;font-weight:600;letter-spacing:.09em;text-transform:uppercase;
  color:var(--accent);margin:0 0 1rem;font-family:var(--sans);
}
.quiet{color:var(--ink-soft);font-size:.95rem}
.tiny{font-size:.83rem;color:var(--ink-faint)}

/* ---------- header --------------------------------------------------- */

.site-header{
  border-bottom:1px solid var(--rule);
  background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:saturate(180%) blur(8px);
  position:sticky;top:0;z-index:50;
}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;height:68px}
.brand{display:flex;align-items:center;gap:.65rem;text-decoration:none;color:var(--ink);font-weight:600;font-size:.98rem;letter-spacing:-.01em}
.brand:hover{color:var(--ink)}
.mark{
  width:32px;height:32px;border-radius:9px;flex:0 0 32px;
  background:var(--accent);color:var(--accent-ink);
  display:grid;place-items:center;
  font-family:var(--serif);font-size:1.02rem;font-weight:600;line-height:1;
  letter-spacing:.01em;
}
.brand .sub{color:var(--ink-faint);font-weight:400;display:none}
@media(min-width:560px){.brand .sub{display:inline}}
.nav{display:flex;align-items:center;gap:1.4rem;font-size:.9rem}
.nav a{color:var(--ink-soft);text-decoration:none}
.nav a:hover{color:var(--accent)}
.nav .lang{display:flex;gap:.5rem;padding-left:1.1rem;border-left:1px solid var(--rule)}
.nav .lang a.on{color:var(--ink);font-weight:600}
.nav .desk{display:none}
@media(min-width:760px){.nav .desk{display:flex;gap:1.4rem}}

/* ---------- sections -------------------------------------------------- */

section{padding:4.5rem 0}
section.tight{padding:3rem 0}
.band{background:var(--surface-2);border-block:1px solid var(--rule)}
.hero{padding:5rem 0 3.5rem}
@media(min-width:900px){.hero{padding:6.5rem 0 4.5rem}}

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

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  min-height:46px;padding:.7rem 1.4rem;
  background:var(--accent);color:var(--accent-ink);
  border-radius:var(--r-sm);border:1px solid transparent;
  font-weight:600;font-size:.97rem;text-decoration:none;
  transition:background .15s ease;
}
.btn:hover{background:var(--accent-hover);color:var(--accent-ink)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--rule-strong)}
.btn.ghost:hover{background:var(--surface);border-color:var(--ink-faint);color:var(--ink)}
.btn-row{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center;margin:1.8rem 0 0}

/* ---------- hero layout ------------------------------------------------ */

.hero-grid{display:grid;gap:2.75rem;align-items:center}
@media(min-width:980px){.hero-grid{grid-template-columns:1.1fr .9fr;gap:3.5rem}}

.signal{
  background:var(--surface);border:1px solid var(--rule);border-radius:var(--r);
  padding:1.6rem;box-shadow:var(--shadow);
}
.signal .kw{
  display:inline-block;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.82rem;background:var(--surface-2);border:1px solid var(--rule);
  padding:.2em .5em;border-radius:5px;color:var(--ink-soft);margin-bottom:1.25rem;
}
.signal .row{display:flex;align-items:baseline;gap:.9rem;padding:.75rem 0;border-top:1px solid var(--rule)}
.signal .row:first-of-type{border-top:0;padding-top:0}
.signal .row b{
  font-family:var(--sans);font-weight:600;font-size:1.6rem;line-height:1.1;
  letter-spacing:-.02em;min-width:5.2rem;
}
.signal .row.zero b{color:var(--accent)}
.signal .row span{font-size:.87rem;color:var(--ink-faint);line-height:1.35}
.signal .concl{
  margin:1.25rem 0 0;padding-top:1rem;border-top:1px solid var(--rule);
  font-size:.9rem;color:var(--ink-soft);
}
.signal .concl strong{color:var(--ink)}

/* ---------- trust strip ------------------------------------------------ */

.trust{
  display:flex;flex-wrap:wrap;gap:.5rem 1.6rem;
  margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--rule);
  font-size:.85rem;color:var(--ink-faint);
}
.trust span{display:inline-flex;align-items:center;gap:.45rem}
.dot{width:5px;height:5px;border-radius:50%;background:var(--accent);flex:0 0 5px}

/* ---------- stat tiles (dataviz spec) ---------------------------------- */

.stats{
  display:grid;gap:1px;background:var(--rule);
  border:1px solid var(--rule);border-radius:var(--r);overflow:hidden;
  grid-template-columns:repeat(auto-fit,minmax(9.5rem,1fr));
}
.stat{background:var(--surface);padding:1.4rem 1.35rem}
.stat .v{
  display:block;font-family:var(--sans);font-weight:600;
  font-size:1.85rem;line-height:1.15;letter-spacing:-.02em;color:var(--ink);
}
.stat .hero-v{font-size:2.7rem}
.stat .l{display:block;font-size:.83rem;color:var(--ink-faint);margin-top:.3rem;line-height:1.35}
.stats-note{font-size:.85rem;color:var(--ink-faint);margin:.85rem 0 0}

/* ---------- hero atmosphere -------------------------------------------- */

.hero{position:relative;overflow:hidden}
.hero::before{
  content:"";position:absolute;inset:-30% -10% auto -10%;height:70%;
  background:radial-gradient(60% 70% at 30% 40%, color-mix(in srgb,var(--accent) 12%,transparent), transparent 70%);
  pointer-events:none;z-index:-1;
}

/* ---------- figures: diagram & chart ------------------------------------ */

figure{margin:0}
.figure{
  background:var(--surface);border:1px solid var(--rule);border-radius:var(--r);
  padding:1.75rem 1.5rem 1.35rem;box-shadow:var(--shadow);
}
.figure svg{display:block;width:100%;max-width:100%;height:auto}
.figure figcaption{
  margin-top:1.1rem;padding-top:.9rem;border-top:1px solid var(--rule);
  font-size:.86rem;color:var(--ink-faint);line-height:1.5;
}
.node-box{fill:var(--surface-2);stroke:var(--rule-strong)}
.node-dead{opacity:.45}
.flow-txt{fill:currentColor;font-family:var(--sans);font-size:13px}
.flow-sm{fill:var(--ink-faint);font-family:var(--sans);font-size:11.5px}
.flow-line{stroke:currentColor;stroke-width:2;fill:none;opacity:.55}
.flow-break{stroke:var(--accent);stroke-width:2;fill:none;stroke-dasharray:5 5}
.flow-x{stroke:var(--accent);stroke-width:2.5;stroke-linecap:round}
.bar{fill:var(--accent)}
.bar-mute{fill:var(--rule-strong)}
.axis-txt{fill:var(--ink-faint);font-family:var(--sans);font-size:12px}
.val-txt{fill:var(--ink);font-family:var(--sans);font-size:14px;font-weight:600}

/* ---------- dark feature band ------------------------------------------- */

.band-dark{
  background:#10312d;color:#eaf3f1;border-block:0;
}
.band-dark h2,.band-dark h3{color:#fff}
.band-dark .lede,.band-dark p{color:#c3d8d3}
.band-dark .eyebrow{color:#7fd4c2}
.band-dark .btn{background:#7fd4c2;color:#08221f}
.band-dark .btn:hover{background:#9ee0d2;color:#08221f}
.band-dark .btn.ghost{border-color:rgba(234,243,241,.32);color:#eaf3f1;background:transparent}
.band-dark .btn.ghost:hover{background:rgba(234,243,241,.09);border-color:rgba(234,243,241,.5);color:#fff}
.band-dark .stats{border-color:rgba(234,243,241,.18);background:rgba(234,243,241,.18)}
.band-dark .stat{background:#10312d}
.band-dark .stat .v{color:#fff}
.band-dark .stat .l{color:#a9c8c1}

/* ---------- icons -------------------------------------------------------- */

.ico{width:34px;height:34px;display:block;margin-bottom:.85rem;color:var(--accent)}
.ico svg{width:100%;height:100%;display:block}

/* ---------- motion -------------------------------------------------------- */

/* Content is visible by default. The animation is opt-in and only applies
   once JS has confirmed it can run — so nothing is ever hidden by a failure. */
.reveal{opacity:1;transform:none}
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .55s ease,transform .55s ease}
.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .js .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ---------- cards ------------------------------------------------------ */

.grid{display:grid;gap:1.1rem}
@media(min-width:760px){.grid.g3{grid-template-columns:repeat(3,1fr)}.grid.g2{grid-template-columns:repeat(2,1fr)}}
.card{
  background:var(--surface);border:1px solid var(--rule);
  border-radius:var(--r);padding:1.6rem;box-shadow:var(--shadow);
}
.card p:last-child{margin-bottom:0}
.card .num{
  display:grid;place-items:center;width:30px;height:30px;border-radius:50%;
  background:var(--accent-wash);color:var(--accent);
  font-size:.85rem;font-weight:700;margin-bottom:.9rem;font-family:var(--sans);
}
.offer{
  background:var(--surface);border:1px solid var(--rule);
  border-radius:var(--r);padding:2rem;box-shadow:var(--shadow);
  border-top:3px solid var(--accent);
}
@media(min-width:760px){.offer{padding:2.4rem}}

/* ---------- article ---------------------------------------------------- */

article{max-width:var(--text)}
article h2{margin-top:2.8rem}
article h3{margin-top:1.9rem;font-family:var(--sans);font-weight:600}
article ul{padding-left:1.15rem;margin:0 0 1.15rem}
article li{margin-bottom:.55rem}
.meta{font-size:.88rem;color:var(--ink-faint);margin:0 0 2.2rem}
blockquote{
  margin:2rem 0;padding:1.2rem 1.4rem;
  background:var(--accent-wash);border-left:3px solid var(--accent);
  border-radius:0 var(--r-sm) var(--r-sm) 0;color:var(--ink);
}
blockquote p:last-child{margin-bottom:0}
code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.88em;
  background:var(--surface-2);border:1px solid var(--rule);
  padding:.08em .38em;border-radius:5px;
}
hr{border:0;border-top:1px solid var(--rule);margin:3rem 0}
.back{display:inline-block;font-size:.88rem;margin-bottom:1.6rem;text-decoration:none;color:var(--ink-soft)}
.back:hover{color:var(--accent)}

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

.site-footer{border-top:1px solid var(--rule);background:var(--surface-2);padding:3rem 0 3.5rem;font-size:.9rem}
.site-footer .cols{display:grid;gap:1.8rem}
@media(min-width:700px){.site-footer .cols{grid-template-columns:1.4fr 1fr 1fr}}
.site-footer h4{font-family:var(--sans);font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);margin:0 0 .7rem;font-weight:600}
.site-footer a{color:var(--ink-soft);text-decoration:none;display:block;margin-bottom:.35rem}
.site-footer a:hover{color:var(--accent)}
.site-footer .legal{margin-top:2.2rem;padding-top:1.3rem;border-top:1px solid var(--rule);color:var(--ink-faint);font-size:.83rem}
.site-footer p{margin:0 0 .35rem;color:var(--ink-soft)}

@media(max-width:520px){
  body{font-size:16px}
  section{padding:3.2rem 0}
  .hero{padding:3.2rem 0 2.4rem}
  .card,.offer{padding:1.35rem}
}

/* ---------- rank chart: HTML, not SVG, so text stays readable on phones -- */

.chart-title{
  font-family:var(--sans);font-size:.86rem;font-weight:600;
  color:var(--ink);margin:0 0 1.1rem;
}
.ranks{display:grid;gap:.55rem}
.rank{display:grid;grid-template-columns:5.8rem 1fr 4.6rem;align-items:center;gap:.75rem}
.rank .rk-l{font-size:.86rem;color:var(--ink-faint);text-align:right;line-height:1.25}
.rank .rk-b{display:block;height:15px;background:var(--surface-2);border-radius:4px;overflow:hidden}
.rank .rk-b i{display:block;height:100%;background:var(--rule-strong);border-radius:4px}
.rank .rk-v{font-size:.86rem;color:var(--ink-faint);white-space:nowrap}
.rank.on .rk-b i{background:var(--accent)}
.rank.on .rk-v{color:var(--ink);font-weight:600;font-size:.95rem}
.rank.off .rk-l,.rank.off .rk-v{opacity:.72}
.rank.off .rk-b i{background:var(--rule-strong);opacity:.6}
@media(max-width:560px){
  .rank{grid-template-columns:4.2rem 1fr auto;gap:.55rem}
  .rank .rk-l,.rank .rk-v,.rank.on .rk-v{font-size:.78rem}
  .rank .rk-b{height:13px}
}

/* three-up stat tiles stack on a phone instead of leaving an empty cell */
@media(max-width:560px){.stats{grid-template-columns:1fr}}