/* ============================================================
   AASRT — Design tokens
   Palette: research-green + tech-slate, grounded in environmental
   science (field measurement) and AI/technology (data ledgers).
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=Public+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --ink:        #16211C;   /* near-black spruce, primary text */
  --ink-soft:   #3B4A42;   /* muted graphite-green, secondary text */
  --paper:      #EEF0EA;   /* pale sage-white, page background */
  --paper-dim:  #E3E6DB;   /* card / panel background */
  --line:       #C9CDC0;   /* hairline rule color */
  --forest:     #2F5C4B;   /* primary accent — research green */
  --forest-dk:  #21453A;
  --slate:      #2C4A63;   /* tech accent — data blue */
  --amber:      #B8823A;   /* highlight accent — warm, not terracotta */
  --white:      #FBFBF7;

  --display: 'Fraunces', serif;
  --body:    'Public Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono:    'IBM Plex Mono', monospace;

  --max: 1120px;
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
body{
  font-family:var(--body);
  color:var(--ink);
  background:var(--paper);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }

.wrap{ max-width:var(--max); margin:0 auto; padding:0 32px; }

h1,h2,h3,h4{ font-family:var(--display); font-weight:600; line-height:1.15; color:var(--ink); }
h1{ font-size:clamp(2.4rem, 5vw, 3.8rem); font-weight:500; }
h2{ font-size:clamp(1.7rem, 3vw, 2.3rem); }
h3{ font-size:1.25rem; }
p{ color:var(--ink-soft); }
.lede{ font-size:1.15rem; color:var(--ink-soft); max-width:60ch; }

.eyebrow{
  font-family:var(--mono);
  font-size:0.72rem;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--forest);
  display:inline-flex;
  align-items:center;
  gap:8px;
}

/* --- signature element: measurement tick-rule, evokes a field
   instrument scale / data ledger. Used as section dividers. --- */
.tick-rule{
  height:14px;
  width:100%;
  background-image:repeating-linear-gradient(
    to right,
    var(--line) 0, var(--line) 1px,
    transparent 1px, transparent 24px
  );
  background-position:bottom;
  background-size:100% 1px;
  background-repeat:no-repeat;
  position:relative;
  margin:0;
}
.tick-rule::before{
  content:'';
  position:absolute; left:0; right:0; bottom:0; height:1px;
  background:var(--line);
}
.tick-rule.accent::before{ background:var(--forest); height:2px; }

/* field tags */
.tags{ display:flex; gap:10px; flex-wrap:wrap; }
.tag{
  font-family:var(--mono);
  font-size:0.7rem;
  letter-spacing:0.06em;
  text-transform:uppercase;
  padding:6px 12px;
  border:1px solid var(--line);
  border-radius:3px;
  color:var(--ink-soft);
  background:var(--white);
}
.tag.env{ border-color:var(--forest); color:var(--forest-dk); }
.tag.ai{ border-color:var(--slate); color:var(--slate); }

/* ---------------- Header / Nav ---------------- */
header.site{
  position:sticky; top:0; z-index:50;
  background:rgba(238,240,234,0.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding:18px 32px;
  max-width:var(--max); margin:0 auto;
}
.brand{ display:flex; align-items:center; gap:10px; }
.brand .mark{
  width:34px; height:34px; border-radius:4px;
  background:var(--forest);
  color:var(--white);
  font-family:var(--mono); font-size:0.8rem; font-weight:500;
  display:flex; align-items:center; justify-content:center;
}
.brand .name{ font-family:var(--display); font-weight:600; font-size:1.05rem; }
.brand .sub{ display:block; font-family:var(--mono); font-size:0.62rem; letter-spacing:.08em; color:var(--ink-soft); text-transform:uppercase; }

.navlinks{ display:flex; align-items:center; gap:30px; }
.navlinks a{
  font-size:0.92rem; color:var(--ink-soft); font-weight:500;
  padding:6px 0; border-bottom:2px solid transparent;
  transition:color .15s, border-color .15s;
}
.navlinks a:hover, .navlinks a.active{ color:var(--forest-dk); border-color:var(--forest); }
.navlinks a.cta{
  background:var(--forest); color:var(--white); padding:10px 18px;
  border-radius:3px; border:none;
}
.navlinks a.cta:hover{ background:var(--forest-dk); color:var(--white); }

.navtoggle{ display:none; background:none; border:1px solid var(--line); border-radius:4px; padding:8px 10px; font-family:var(--mono); }

@media (max-width:860px){
  .navlinks{
    position:absolute; top:100%; left:0; right:0;
    background:var(--paper); border-bottom:1px solid var(--line);
    flex-direction:column; align-items:flex-start; gap:0;
    padding:8px 32px 18px; display:none;
  }
  .navlinks.open{ display:flex; }
  .navlinks a{ width:100%; padding:12px 0; border-bottom:1px solid var(--line); }
  .navtoggle{ display:block; }
}

/* ---------------- Buttons ---------------- */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--body); font-weight:600; font-size:0.95rem;
  padding:13px 24px; border-radius:3px; border:1px solid transparent;
  cursor:pointer; transition:transform .12s, background .15s, color .15s;
}
.btn:hover{ transform:translateY(-1px); }
.btn-primary{ background:var(--forest); color:var(--white); }
.btn-primary:hover{ background:var(--forest-dk); }
.btn-outline{ border-color:var(--ink); color:var(--ink); background:transparent; }
.btn-outline:hover{ background:var(--ink); color:var(--white); }
.btn-slate{ background:var(--slate); color:var(--white); }
.btn-slate:hover{ background:#1e364a; }

/* ---------------- Hero ---------------- */
.hero{ padding:88px 0 64px; }
.hero .eyebrow{ margin-bottom:22px; }
.hero h1{ max-width:16ch; margin-bottom:22px; }
.hero-actions{ display:flex; gap:14px; margin-top:32px; flex-wrap:wrap; }

/* ---------------- Sections / cards ---------------- */
section{ padding:64px 0; }
section.tight{ padding:48px 0; }
.section-head{ margin-bottom:40px; max-width:64ch; }

.grid3{ display:grid; grid-template-columns:repeat(3,1fr); gap:28px; }
.grid2{ display:grid; grid-template-columns:1fr 1fr; gap:28px; }
@media (max-width:860px){ .grid3, .grid2{ grid-template-columns:1fr; } }

.card{
  background:var(--white); border:1px solid var(--line); border-radius:6px;
  padding:30px; height:100%;
}
.card .eyebrow{ margin-bottom:14px; }
.card h3{ margin-bottom:10px; }
.card p{ font-size:0.95rem; }

.panel-dark{
  background:var(--ink); color:var(--white); border-radius:8px; padding:48px;
}
.panel-dark h2, .panel-dark h3{ color:var(--white); }
.panel-dark p{ color:#C9D2CB; }

.stat-row{ display:flex; gap:0; border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.stat{ flex:1; padding:22px 0; border-right:1px solid var(--line); }
.stat:last-child{ border-right:none; }
.stat .num{ font-family:var(--display); font-size:1.6rem; color:var(--forest-dk); }
.stat .label{ font-family:var(--mono); font-size:0.68rem; text-transform:uppercase; letter-spacing:.06em; color:var(--ink-soft); }

.note-box{
  border-left:3px solid var(--amber); background:var(--paper-dim);
  padding:16px 20px; font-size:0.92rem; color:var(--ink-soft); border-radius:0 4px 4px 0;
}

/* ---------------- Footer ---------------- */
footer.site{ border-top:1px solid var(--line); padding:56px 0 32px; margin-top:40px; }
.footer-grid{ display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:32px; margin-bottom:36px; }
.footer-grid h4{ font-family:var(--mono); font-size:0.7rem; letter-spacing:.08em; text-transform:uppercase; color:var(--ink-soft); margin-bottom:14px; }
.footer-grid a, .footer-grid li{ font-size:0.9rem; color:var(--ink-soft); margin-bottom:8px; display:block; }
.footer-grid a:hover{ color:var(--forest-dk); }
.footer-bottom{ display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; font-family:var(--mono); font-size:0.72rem; color:var(--ink-soft); border-top:1px solid var(--line); padding-top:20px; }
@media (max-width:860px){ .footer-grid{ grid-template-columns:1fr 1fr; } }

/* ---------------- Journal / blog specific ---------------- */
.blog-post{ border-bottom:1px solid var(--line); padding:34px 0; display:grid; grid-template-columns:140px 1fr; gap:24px; }
.blog-post:last-child{ border-bottom:none; }
.blog-post .meta{ font-family:var(--mono); font-size:0.72rem; color:var(--ink-soft); }
.blog-post h3{ margin-bottom:8px; }
@media (max-width:700px){ .blog-post{ grid-template-columns:1fr; } }

.pill{
  display:inline-block; font-family:var(--mono); font-size:0.68rem; text-transform:uppercase;
  letter-spacing:.05em; padding:4px 10px; border-radius:20px; background:var(--paper-dim); color:var(--ink-soft); margin-bottom:10px;
}
.pill.editorial{ background:#E7E1D0; color:var(--amber); }

/* ---------------- Membership tiers ---------------- */
.tier{ border:1px solid var(--line); border-radius:8px; padding:32px; background:var(--white); display:flex; flex-direction:column; }
.tier.featured{ border-color:var(--forest); box-shadow:0 0 0 1px var(--forest); }
.tier .price{ font-family:var(--display); font-size:2rem; margin:14px 0; color:var(--forest-dk); }
.tier ul{ margin:18px 0; flex:1; }
.tier li{ font-size:0.9rem; color:var(--ink-soft); padding:6px 0; border-bottom:1px dashed var(--line); }
.tier li:last-child{ border-bottom:none; }

/* ---------------- Utility ---------------- */
.center{ text-align:center; }
.mt{ margin-top:24px; }
.mb{ margin-bottom:24px; }