:root{
  --bg:#f0ece6;
  --bg-alt:#e1dcd3;
  --dark:#221e1a;
  --ink:#1f1c18;
  --muted:#726c63;
  --accent:#2f6a8c;
  --accent2:#a05a2c;
  --serif:Georgia,'Times New Roman',serif;
  --sans:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --maxw:1140px;
}

*{box-sizing:border-box}

html{-webkit-text-size-adjust:100%}

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.72;
  overflow-x:hidden;
}

img{max-width:100%;height:auto;display:block}

a{color:var(--accent);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}

:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* ---------- grid ---------- */
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.grid{display:grid;grid-template-columns:repeat(12,1fr);column-gap:28px}
.c6{grid-column:4/10}
.c7{grid-column:1/8}
.c8{grid-column:3/11}
.c4a{grid-column:2/6}
.c4b{grid-column:8/12}
.c3a{grid-column:2/5}
.c3b{grid-column:9/12}
.c5a{grid-column:1/6}
.c6b{grid-column:7/13}

/* ---------- typography ---------- */
h1,h2,h3{font-family:var(--serif);font-weight:400;color:var(--ink);letter-spacing:.005em}
h1{font-size:2.55rem;line-height:1.24;margin:0 0 28px}
h1 .l{display:block}
h2{font-size:1.72rem;line-height:1.32;margin:0 0 20px}
h3{font-size:1.2rem;font-style:italic;line-height:1.4;margin:34px 0 12px}
p{margin:0 0 20px;max-width:70ch}
.lead{font-size:1.09rem}
.mark{
  font-family:var(--sans);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--accent2);
  margin:0 0 14px;
}
.note{color:var(--muted);font-size:.94rem}

ul,ol{margin:0 0 22px;padding-left:1.15rem;max-width:66ch}
li{margin-bottom:9px}
li::marker{color:var(--accent)}
ol li::marker{color:var(--accent2);font-family:var(--serif)}

/* ---------- header ---------- */
.site-head{border-bottom:1px solid rgba(114,108,99,.28);background:var(--bg)}
.head-in{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:center;gap:10px 28px;padding:22px 24px}
.brand{font-family:var(--serif);font-size:1.22rem;color:var(--ink);text-decoration:none;letter-spacing:.03em}
.brand:hover{color:var(--accent)}
.site-nav ul{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 22px;list-style:none;margin:0;padding:0;max-width:none}
.site-nav li{margin:0}
.site-nav a{font-size:.93rem;color:var(--ink);text-decoration:none;border-bottom:1px solid transparent;padding-bottom:2px}
.site-nav a:hover,.site-nav a[aria-current="page"]{border-bottom-color:var(--accent);color:var(--accent)}

/* ---------- hero ---------- */
.hero{position:relative;padding:72px 0 64px;text-align:center}
.hero::before{
  content:"";position:absolute;left:50%;top:0;bottom:0;width:1px;
  background:linear-gradient(to bottom,rgba(47,106,140,0),rgba(47,106,140,.55) 18%,rgba(47,106,140,.55) 82%,rgba(47,106,140,0));
}
.hero .wrap{position:relative}
.hero h1{max-width:20ch;margin-left:auto;margin-right:auto}
.hero .lead{margin-left:auto;margin-right:auto;text-align:left}
.hero-sides{margin-top:44px;row-gap:28px}
.hero-sides div{text-align:left}
.hero-sides p{font-size:.95rem;line-height:1.66;color:var(--muted);margin:0}
.hero-sides h2{font-size:1rem;font-family:var(--sans);letter-spacing:.02em;margin:0 0 8px;color:var(--ink)}

/* ---------- figures ---------- */
.fig-main{padding:0 0 64px;text-align:center}
.fig-main figure{margin:0}
.fig-main img{width:100%;max-width:680px;margin:0 auto;border:1px solid rgba(34,30,26,.18)}
figcaption{font-size:.88rem;color:var(--muted);margin-top:12px;line-height:1.6}
.fig-main figcaption{max-width:52ch;margin-left:auto;margin-right:auto}

/* ---------- sections ---------- */
section{padding:64px 0}
.s-alt{background:var(--bg-alt)}
.s-air{padding:80px 0}
.s-wide{padding:96px 0}

.split{row-gap:28px}
.pair{row-gap:32px;margin-top:8px}
.pair h3{margin-top:0}

/* arc separator */
.arc-row{display:grid;grid-template-columns:repeat(12,1fr);column-gap:28px;padding:0 24px;max-width:var(--maxw);margin:0 auto}
.arc{grid-column:5/9;height:40px;border-top:1px solid var(--accent2);border-radius:260px 260px 0 0;opacity:.55}

/* dark section */
.s-dark{background:var(--dark);color:var(--bg)}
.s-dark h2,.s-dark h3{color:var(--bg)}
.s-dark p{color:#ded8cf}
.s-dark .mark{color:#c78a54}
.s-dark a{color:#8fc0dc}
.s-dark li::marker{color:#8fc0dc}
.s-dark figcaption{color:#a49b8f}
.s-dark ul,.s-dark ol{color:#ded8cf}
.s-dark .arc{border-top-color:#c78a54}
.dark-media{row-gap:32px;align-items:start}
.dark-media img{width:100%;border:1px solid rgba(240,236,230,.22)}

/* checklist block */
.checklist{border-top:1px solid rgba(160,90,44,.45);padding-top:22px;margin-top:8px}

/* ---------- about ---------- */
.page-head{padding:64px 0 8px;text-align:center;position:relative}
.page-head::before{
  content:"";position:absolute;left:50%;top:22px;bottom:0;width:1px;
  background:linear-gradient(to bottom,rgba(47,106,140,0),rgba(47,106,140,.5),rgba(47,106,140,0));
}
.page-head .wrap{position:relative}
.page-head h1{font-size:2.2rem;max-width:22ch;margin:0 auto 18px}
.prose{padding:40px 0 64px}
.prose p,.prose ul,.prose ol{text-align:left}
.centered-text{text-align:center}
.centered-text p{margin-left:auto;margin-right:auto;text-align:left}

/* ---------- footer ---------- */
.site-foot{background:var(--bg-alt);padding:0 0 56px;text-align:center;border-top:0}
.foot-arc{padding-top:8px}
.foot-in{padding-top:36px}
.foot-name{font-family:var(--serif);font-size:1.3rem;margin:0 0 18px;letter-spacing:.03em}
.foot-nav ul{list-style:none;display:flex;flex-wrap:wrap;justify-content:center;gap:8px 0;margin:0 0 20px;padding:0;max-width:none}
.foot-nav li{margin:0;display:flex;align-items:center}
.foot-nav li+li::before{content:"";width:1px;height:12px;background:rgba(114,108,99,.6);margin:0 14px}
.foot-nav a{font-size:.92rem;color:var(--ink);text-decoration:none;border-bottom:1px solid transparent;padding-bottom:2px}
.foot-nav a:hover{border-bottom-color:var(--accent);color:var(--accent)}
.foot-mail{margin:0 0 10px}
.foot-note{color:var(--muted);font-size:.9rem;max-width:56ch;margin:0 auto}

/* ---------- responsive ---------- */
@media (max-width:900px){
  h1{font-size:2.1rem}
  h2{font-size:1.5rem}
  .c6,.c7,.c8,.c4a,.c4b,.c3a,.c3b,.c5a,.c6b{grid-column:1/13}
  .pair{row-gap:24px}
  .dark-media img{max-width:520px}
}

@media (max-width:640px){
  body{font-size:16.5px}
  h1{font-size:1.78rem}
  h2{font-size:1.35rem}
  h3{font-size:1.1rem}
  section{padding:44px 0}
  .s-air,.s-wide{padding:52px 0}
  .hero{padding:48px 0 40px}
  .hero::before,.page-head::before{display:none}
  .hero-sides{margin-top:32px}
  .fig-main{padding-bottom:44px}
  .arc{grid-column:3/11;height:28px}
  .head-in{padding:18px 20px;gap:10px 18px}
  .site-nav ul{gap:6px 16px}
  .wrap,.arc-row{padding:0 20px}
  .grid{column-gap:0}
  .foot-nav li+li::before{margin:0 10px}
}