/* Shared design system — adopted from sustainablecalendar.com so every page
   (Calendar, About, Subscribe, Add an event) is one seamless site. */
:root{
  --bg:#f6f8f3; --paper:#ffffff; --ink:#17342f; --muted:#5f706a; --line:#d9e4d6;
  --green:#1f7a4d; --green-dark:#11543d; --mint:#dff3e5; --blue:#245a73; --gold:#f2c94c;
  --paid:#a85a16;
  --shadow:0 24px 70px rgba(20,58,49,.13); --radius:22px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink);
  background:
    radial-gradient(circle at top left,rgba(223,243,229,.9),transparent 32rem),
    linear-gradient(180deg,#f8fbf4 0%,var(--bg) 38%,#eef5ee 100%);
  background-attachment:fixed;line-height:1.55;
}
a{color:inherit}
.skip-link{position:absolute;top:-40px;left:1rem;background:var(--ink);color:#fff;padding:.75rem 1rem;z-index:100}
.skip-link:focus{top:1rem}

/* Header / nav */
.site-header{position:sticky;top:0;z-index:50;backdrop-filter:blur(18px);background:rgba(246,248,243,.84);border-bottom:1px solid rgba(217,228,214,.85)}
.nav{width:min(1180px,calc(100% - 32px));margin:0 auto;height:76px;display:flex;align-items:center;justify-content:space-between;gap:1.5rem}
.brand{display:flex;align-items:center;gap:.75rem;text-decoration:none;font-weight:800}
.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:14px;color:#fff;background:linear-gradient(135deg,var(--green),var(--blue));letter-spacing:-.04em}
.nav-links{display:flex;align-items:center;gap:1.1rem;font-weight:700;color:var(--muted)}
.nav-links a{text-decoration:none}
.nav-links a.nav-text[aria-current="page"]{color:var(--green-dark);text-decoration:underline;text-underline-offset:6px;text-decoration-thickness:2px}
.nav-toggle{display:none;border:0;background:transparent;font-size:1.6rem;color:var(--ink);cursor:pointer}

/* Buttons */
.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:.85rem 1.15rem;border-radius:999px;border:1px solid var(--green);background:var(--green);color:#fff;text-decoration:none;font-weight:800;box-shadow:0 10px 24px rgba(31,122,77,.22);cursor:pointer}
.button:hover{background:var(--green-dark);border-color:var(--green-dark)}
.button-secondary{background:transparent;color:var(--green-dark);box-shadow:none}
.button-secondary:hover{background:var(--mint);color:var(--green-dark)}
.button-small{min-height:40px;padding:.55rem .95rem;color:#fff!important}
.button-secondary.button-small{color:var(--green-dark)!important}
.button-light{background:#fff;color:var(--green-dark);border-color:#fff}

/* Layout primitives */
.section{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:64px 0}
.eyebrow{margin:0 0 .75rem;text-transform:uppercase;letter-spacing:.13em;color:var(--green);font-size:.8rem;font-weight:900}
h1,h2,h3{line-height:1.06;letter-spacing:-.04em;margin:0}
h1{font-size:clamp(2.6rem,6vw,5rem);max-width:900px}
h2{font-size:clamp(1.8rem,4vw,3rem)}
.lead{max-width:690px;font-size:clamp(1.05rem,2.1vw,1.35rem);color:var(--muted);margin:1.4rem 0 2rem}
.section-heading{margin-bottom:1.4rem;max-width:760px}
.section-heading p:not(.eyebrow),.split-heading>p{color:var(--muted);font-size:1.05rem}
.split-heading{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(280px,.8fr);align-items:end;gap:2rem;max-width:none}

/* Hero */
.hero{min-height:520px;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(330px,.65fr);align-items:center;gap:3rem;padding-top:56px}
.hero-actions{display:flex;flex-wrap:wrap;gap:.9rem}
.hero-card{background:rgba(255,255,255,.84);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow);transform:rotate(1deg)}
.hero-card-topline{font-weight:900;margin-bottom:1rem;color:var(--blue)}
.metric-list{list-style:none;padding:0;margin:0;display:grid;gap:.85rem}
.metric-list li{display:grid;gap:.15rem;padding:1rem;border-radius:18px;background:var(--bg)}
.metric-list span{color:var(--muted);font-size:.88rem}
.metric-list strong{font-size:1.15rem}

/* Cards / grids */
.intro-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;padding-top:0}
.info-card,.embed-shell,.source-card{background:rgba(255,255,255,.86);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 14px 44px rgba(20,58,49,.07)}
.info-card{padding:1.4rem}
.icon{font-size:2rem;margin-bottom:.8rem}
.info-card h2{font-size:1.25rem;letter-spacing:-.02em}
.info-card p{color:var(--muted);margin-bottom:0}
.embed-shell{padding:.6rem;overflow:hidden}
.embed-shell iframe{display:block;border-radius:16px;width:100%;min-height:650px;border:0}

/* CTA band */
.cta-band{display:flex;align-items:center;justify-content:space-between;gap:2rem;padding:2rem;border-radius:28px;color:#fff;background:linear-gradient(135deg,var(--green-dark),var(--blue));box-shadow:var(--shadow)}
.cta-band .eyebrow{color:var(--gold)}
.cta-band h2{color:#fff}
.cta-band p:not(.eyebrow){margin-bottom:0;color:rgba(255,255,255,.84)}

/* Sources */
.source-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
.source-card{padding:1rem;text-decoration:none;transition:transform .2s,box-shadow .2s;display:grid;gap:.7rem;min-height:150px}
.source-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.source-logo{width:42px;height:42px;border-radius:13px;border:1px solid var(--line);background:#fff;padding:.35rem}
.source-name{font-weight:900}
.source-url{color:var(--muted);font-size:.88rem;word-break:break-word}

/* Footer */
.footer{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:40px 0 60px;color:var(--muted);display:flex;justify-content:space-between;gap:2rem;border-top:1px solid var(--line)}
.fine-print{text-align:right}

/* Reveal */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.is-visible{opacity:1;transform:translateY(0)}

@media (max-width:900px){
  .nav-links{position:absolute;left:16px;right:16px;top:76px;display:none;flex-direction:column;align-items:stretch;padding:1rem;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
  .nav-links.is-open{display:flex}
  .nav-toggle{display:block}
  .hero,.split-heading{grid-template-columns:1fr}
  .intro-grid,.source-grid{grid-template-columns:1fr 1fr}
  .hero{min-height:auto;padding-top:36px}
  .footer,.cta-band{flex-direction:column;align-items:flex-start}
  .fine-print{text-align:left}
}
@media (max-width:620px){
  .section{padding:48px 0}
  .intro-grid,.source-grid{grid-template-columns:1fr}
  .brand-text{display:none}
  .hero-card{transform:none}
  .button{width:100%}
}