/* Layout: a borehole log. Depth labels run down a left gutter; each section is a stratum that darkens with depth below a full-bleed ground line taken from the logo. */
:root{
  --s1:#F4F6F7;--s2:#EEF2F4;--s3:#E9EEF1;--s4:#E4EAEE;--s5:#E0E6EA;--s6:#DCE3E8;--s7:#D8DFE5;
  --ink:#15212B;--ink-2:#44525F;--rule:#C9D3DA;--field:#FFFFFF;
  --accent:#1F7A73;--accent-text:#17645E;--on-accent:#FFFFFF;
  --sister-text:#A53D14;
  --logo-ink:#15212B;--logo-acc:#1F7A73;
  --band:#15212B;--band-ink:#E8EDF0;--band-ink-2:#A9B6C0;--band-rule:#2C3B47;
  --band-logo:#FFFFFF;--band-acc:#62A29D;--band-sister:#D48060;--band-on-sister:#0B141A;
  --display:"Archivo","Arial Narrow",Arial,system-ui,sans-serif;
  --body:"Source Serif 4",Georgia,"Times New Roman",serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --u:clamp(1.5px,0.4vw,2.8px);
  --gl:max(16px,env(safe-area-inset-left,0px));
  --gr:max(16px,env(safe-area-inset-right,0px));
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--s1:#0F1820;--s2:#0D161D;--s3:#0C141B;--s4:#0B1319;--s5:#0A1117;--s6:#091015;--s7:#080E12;--ink:#E6ECEF;--ink-2:#A2B0BB;--rule:#2A3945;--field:#0B141A;--accent:#62A29D;--accent-text:#62A29D;--on-accent:#0B141A;--sister-text:#D48060;--logo-ink:#FFFFFF;--logo-acc:#62A29D;--band:#050A0E;--band-rule:#1E2B35;color-scheme:dark}}
:root[data-theme="dark"]{--s1:#0F1820;--s2:#0D161D;--s3:#0C141B;--s4:#0B1319;--s5:#0A1117;--s6:#091015;--s7:#080E12;--ink:#E6ECEF;--ink-2:#A2B0BB;--rule:#2A3945;--field:#0B141A;--accent:#62A29D;--accent-text:#62A29D;--on-accent:#0B141A;--sister-text:#D48060;--logo-ink:#FFFFFF;--logo-acc:#62A29D;--band:#050A0E;--band-rule:#1E2B35;color-scheme:dark}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--s1);color:var(--ink);font-family:var(--body);font-size:1.0625rem;line-height:1.62;font-optical-sizing:auto}
img,svg{max-width:100%}
a{color:var(--accent-text);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.skip{position:absolute;left:-9999px;top:.5rem;z-index:30;background:var(--ink);color:var(--s1);padding:.6rem 1rem;font-family:var(--display);font-weight:700;text-decoration:none}
.skip:focus{left:var(--gl)}
.wrap{max-width:72.5rem;margin:0 auto;padding-left:max(16px, env(safe-area-inset-left, 0px));padding-right:max(16px, env(safe-area-inset-right, 0px))}
h1,h2,h3{font-family:var(--display);color:var(--ink);text-wrap:balance;margin:0}
h1{font-size:clamp(2.05rem,1.2rem + 3.3vw,3.8rem);font-weight:800;font-stretch:112%;line-height:1.04;letter-spacing:-.012em}
h2{font-size:clamp(1.55rem,1.15rem + 1.5vw,2.3rem);font-weight:800;font-stretch:110%;line-height:1.1;letter-spacing:-.008em}
h3{font-size:1.125rem;font-weight:700;line-height:1.3}
p,ul,ol,figure{margin:0}
.measure{max-width:64ch}
.eyebrow,.depth,.label,.ground-label,.meta{font-family:var(--mono);font-size:.75rem;font-weight:500;letter-spacing:.08em;text-transform:uppercase;line-height:1.4}
.depth,.ground-label{text-transform:none;letter-spacing:.04em;font-size:.8125rem}
.lg-ink{fill:var(--logo-ink)}.lg-acc{fill:var(--logo-acc)}
.band .lg-ink{fill:var(--band-logo)}.band .lg-acc{fill:var(--band-acc)}

/* header */
.site-head{background:var(--s1);border-bottom:1px solid var(--rule)}
.head-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem 2rem;padding-block:1rem}
.brand{display:inline-flex;align-items:flex-start;gap:.2rem;text-decoration:none;color:var(--ink-2)}
.brand .logo{height:2.25rem;width:auto;display:block}
.tm{font-family:var(--display);font-size:.625rem;font-weight:600;line-height:1}
.nav{display:flex;flex-wrap:wrap;gap:.25rem 1.25rem;font-family:var(--display);font-size:.9375rem;font-weight:600}
.nav a{color:var(--ink);text-decoration:none;padding-block:.3rem;border-bottom:2px solid transparent}
.nav a:hover{border-bottom-color:var(--accent)}
.nav a.to-sister{color:var(--sister-text)}

/* hero, above the line */
.hero{background:var(--s1)}
.hero-inner{padding-block:clamp(2.5rem,6vw,5.25rem) calc(34*var(--u) + 2.5rem)}
.hero .eyebrow{color:var(--accent-text)}
.hero h1{max-width:19ch;margin-top:1.1rem}
.lead{font-size:clamp(1.125rem,1rem + .5vw,1.3125rem);line-height:1.5;color:var(--ink-2);max-width:46ch;margin-top:1.4rem}
.facts{display:flex;flex-wrap:wrap;gap:.4rem 1.5rem;margin-top:1.4rem;padding:0;list-style:none;color:var(--ink)}
.facts li{display:flex;gap:.5rem;align-items:baseline}
.facts .label{color:var(--ink-2)}
.actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:2rem}
.btn{display:inline-flex;align-items:center;justify-content:center;font-family:var(--display);font-weight:700;font-size:1rem;line-height:1.1;padding:.9rem 1.3rem;border-radius:2px;text-decoration:none;border:1.5px solid transparent;cursor:pointer}
.btn-primary{background:var(--accent);color:var(--on-accent)}
.btn-primary:hover{filter:brightness(1.08)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:var(--s1)}

/* the ground line, with the logo's two triangles anchored to it */
.ground{position:relative;z-index:2;background:var(--accent);height:calc(6*var(--u))}
.ground-inner{position:relative;height:100%}
.ground-label{position:absolute;left:var(--gl);bottom:calc(100% + .65rem);color:var(--ink-2);white-space:nowrap}
.tri{position:absolute;display:block;fill:var(--ink)}
.tri-up{width:calc(40*var(--u));height:calc(26*var(--u));bottom:calc(100% + 4*var(--u));right:calc(var(--gr) + 1.5rem + 18*var(--u))}
.tri-down{width:calc(76*var(--u));height:calc(66*var(--u));top:calc(100% + 4*var(--u));right:calc(var(--gr) + 1.5rem)}

/* strata */
.st2{background:var(--s2)}.st3{background:var(--s3)}.st4{background:var(--s4)}.st5{background:var(--s5)}.st6{background:var(--s6)}.st7{background:var(--s7)}
.stratum-grid{position:relative;display:grid;grid-template-columns:minmax(0,1fr);gap:.9rem;padding-block:clamp(2.75rem,6vw,4.5rem)}
.first .stratum-grid{padding-top:calc(70*var(--u) + 2rem)}
.depth{color:var(--ink-2);display:flex;align-items:center;gap:.6rem}
.depth::before{content:"";width:1rem;height:1px;background:var(--ink-2)}
.stratum-body{min-width:0}
.stratum-body > h2 + *{margin-top:1rem}
.intro{color:var(--ink-2);max-width:62ch}
@media (min-width:56rem){
  .stratum-grid{grid-template-columns:8.5rem minmax(0,1fr);gap:2.75rem;padding-block:clamp(3.5rem,6vw,5.25rem)}
  .stratum-grid::before{content:"";position:absolute;top:0;bottom:0;left:calc(var(--gl) + 8.5rem);width:1px;background:var(--rule)}
  .first .stratum-grid{padding-top:clamp(3.5rem,6vw,5.25rem)}
  .first .stratum-body{padding-right:calc(80*var(--u))}
  .depth{position:sticky;top:calc(env(safe-area-inset-top,0px) + 1.5rem);align-self:start;padding-top:.5rem}
  .depth::before{display:none}
  .depth::after{content:"";flex:1;height:1px;background:var(--ink-2)}
}

/* lists */
.topics{list-style:none;padding:0;margin-top:2rem;display:grid;grid-template-columns:repeat(auto-fit,minmax(15.5rem,1fr));gap:1.6rem 2.5rem}
.topics li{display:grid;grid-template-columns:auto minmax(0,1fr);column-gap:.85rem;row-gap:.2rem}
.topics li::before{content:"";grid-row:1 / span 2;width:.8rem;height:.7rem;margin-top:.4rem;background:var(--accent);clip-path:polygon(0 0,100% 0,50% 100%)}
.topics p{color:var(--ink-2);font-size:1rem}
.ticks{list-style:none;padding:0;margin-top:1rem;display:grid;gap:.55rem}
.ticks li{position:relative;padding-left:1.45rem}
.ticks li::before{content:"";position:absolute;left:0;top:.6em;width:.62rem;height:.54rem;background:var(--accent);clip-path:polygon(0 0,100% 0,50% 100%)}
.rules{list-style:none;padding:0;margin-top:1.75rem;display:grid;gap:0;border-top:1px solid var(--rule);max-width:46rem}
.rules li{padding:.95rem 0 .95rem 1.6rem;border-bottom:1px solid var(--rule);position:relative}
.rules li::before{content:"";position:absolute;left:0;top:1.62rem;width:.9rem;height:calc(2*var(--u));min-height:3px;background:var(--accent)}

/* two columns */
.split{display:grid;gap:2.25rem;margin-top:1.25rem}
@media (min-width:48rem){.split{grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);align-items:start;gap:3rem}}
.split > *{min-width:0}
.sub{margin-top:1.75rem}
.sub h3{margin-bottom:.1rem}
.note{font-size:.9375rem;color:var(--ink-2);margin-top:1.25rem;max-width:60ch}

/* address with copy */
.address{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem 1rem;padding:1.1rem 1.2rem;border:1px solid var(--rule);background:var(--s1);border-radius:2px}
.address .label{flex-basis:100%;color:var(--ink-2)}
.address code{font-family:var(--mono);font-size:1rem;color:var(--ink);overflow-wrap:anywhere;user-select:all}
.btn-copy{font-family:var(--display);font-weight:600;font-size:.875rem;line-height:1;padding:.5rem .8rem;border:1.5px solid var(--ink);background:transparent;color:var(--ink);border-radius:2px;cursor:pointer}
.btn-copy:hover{background:var(--ink);color:var(--s1)}

/* Issue 1 cover (journal) */
.cover{aspect-ratio:3/4;width:100%;max-width:17rem;background:var(--band);color:var(--band-ink);display:grid;grid-template-rows:auto auto 1fr auto;padding:1.2rem;border-radius:2px;overflow:hidden}
.cover .logo{width:100%;height:auto;display:block}
.cover-line{height:calc(5*var(--u));min-height:6px;background:var(--band-acc);margin:1.4rem -1.2rem 0}
.cover-tri{justify-self:center;align-self:start;width:56%;height:auto;margin-top:calc(3*var(--u));fill:var(--band-logo)}
.cover-meta{display:flex;justify-content:space-between;gap:.5rem;color:var(--band-ink-2);font-size:.6875rem}

/* figures (summit) */
.figures{list-style:none;padding:0;margin-top:2rem;display:grid;grid-template-columns:repeat(auto-fit,minmax(13.5rem,1fr));gap:1px;background:var(--rule);border:1px solid var(--rule)}
.figures li{background:var(--s1);padding:1.25rem 1.2rem 1.4rem;display:grid;gap:.65rem;align-content:start;min-width:0}
.fig-num{font-family:var(--display);font-weight:800;font-stretch:112%;font-size:clamp(1.9rem,1.4rem + 1.5vw,2.55rem);line-height:1;font-variant-numeric:tabular-nums;color:var(--ink);display:flex;flex-wrap:wrap;align-items:baseline;gap:.3rem}
.fig-unit{font-family:var(--mono);font-weight:500;font-size:.8125rem;letter-spacing:.03em;color:var(--accent-text)}
.fig-text{font-size:.9375rem;color:var(--ink-2)}
.fig-text sup a{font-family:var(--mono);font-size:.75em;text-decoration:none}
.closer{font-size:clamp(1.125rem,1rem + .45vw,1.3rem);line-height:1.5;max-width:52ch;margin-top:2rem}

/* programme (summit) */
.days{display:grid;gap:1.75rem;margin-top:2rem}
@media (min-width:48rem){.days{grid-template-columns:repeat(2,minmax(0,1fr));gap:2.75rem}}
.day{border-top:calc(3*var(--u)) solid var(--accent);padding-top:1rem;min-width:0}
.day .label{color:var(--accent-text)}
.day h3{font-size:1.3rem;margin-top:.35rem}

/* form */
.form{display:grid;gap:1.15rem;margin-top:1.75rem;max-width:40rem}
.row2{display:grid;gap:1.15rem}
@media (min-width:40rem){.row2{grid-template-columns:1fr 1fr}}
.field{display:grid;gap:.4rem;min-width:0}
.field label,.choices legend{font-family:var(--mono);font-size:.75rem;font-weight:500;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-2)}
.field input{font-family:var(--body);font-size:1rem;color:var(--ink);background:var(--field);border:1px solid var(--rule);border-radius:2px;padding:.7rem .8rem;width:100%}
.field input:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.choices{border:0;padding:0;margin:0;min-width:0}
.choices legend{padding:0;margin-bottom:.5rem}
.chips{display:flex;flex-wrap:wrap;gap:.5rem}
.chip{position:relative}
.chip input{position:absolute;opacity:0;width:1px;height:1px;margin:0}
.chip span{display:inline-block;padding:.55rem .85rem;border:1px solid var(--rule);border-radius:2px;background:var(--field);font-family:var(--display);font-weight:600;font-size:.9375rem;cursor:pointer;color:var(--ink)}
.chip input:checked + span{background:var(--ink);border-color:var(--ink);color:var(--s1)}
.chip input:focus-visible + span{outline:3px solid var(--accent);outline-offset:2px}
.consent{display:grid;grid-template-columns:auto minmax(0,1fr);gap:.65rem;align-items:start;font-size:.9375rem;color:var(--ink-2)}
.consent input{width:1.1rem;height:1.1rem;margin:.22rem 0 0;accent-color:var(--accent)}
.status{padding:.9rem 1rem;border-left:3px solid var(--accent);background:var(--s1);font-size:.9375rem}
.privacy{font-size:.875rem;color:var(--ink-2);max-width:60ch;margin-top:1.5rem}

/* footer band */
.site-foot{background:var(--band);color:var(--band-ink-2);font-size:.9375rem}
.site-foot a{color:var(--band-ink)}
.foot-teaser{display:grid;gap:1.25rem;padding-block:3rem 2.5rem;border-bottom:1px solid var(--band-rule);align-items:end}
@media (min-width:48rem){.foot-teaser{grid-template-columns:minmax(0,1fr) auto;gap:2rem}}
.foot-teaser .label{color:var(--band-sister)}
.foot-teaser h2{color:var(--band-ink);margin-top:.5rem}
.foot-teaser p{margin-top:.6rem;max-width:54ch}
.btn-sister{background:var(--band-sister);color:var(--band-on-sister)}
.btn-sister:hover{filter:brightness(1.08)}
.foot-main{display:grid;gap:1.75rem;padding-block:2.25rem 2.75rem}
@media (min-width:48rem){.foot-main{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:3rem}}
.foot-main > *{min-width:0}
.foot-main .logo{height:2rem;width:auto;display:block}
.legal{font-size:.875rem;line-height:1.55;margin-top:1rem}
.legal p + p{margin-top:.5rem}
.foot-links{list-style:none;padding:0;display:grid;gap:.4rem}
.sources{font-size:.8125rem;line-height:1.5;margin-top:1.25rem}
.sources ol{padding-left:1.2rem;margin-top:.4rem;display:grid;gap:.3rem}
.notfound{padding-block:5rem}
.notfound p{margin-top:1rem}