/* =========================================================
   Natural Alternatives — Tier 1 (Grayscale + Single Green)
   BRAND RULE (Tier 1): Use NA green exactly ONCE per viewport.
   Implementation:
   - Nav active indicator is GREY (never green).
   - Each page uses ONE green element:
     * index.html: subtitle underline
     * guide.html + checklist.html: a single section cue tick
   - Brand mark: leaf-outline green inside the icon (asset), not CSS.
   ========================================================= */

:root{
  --bg: #3c3c3c;           /* light charcoal */
  --panel: #424242;        /* slightly lighter charcoal */
  --text: #f5f5f5;         /* main text */
  --muted: #d2d2d2;        /* secondary text */
  --muted2: #bfbfbf;       /* tertiary text */
  --line: #8c8c8c;         /* line accents */
  --line2: #6f6f6f;        /* softer lines */
  --na-green: #7ac143;     /* Natural Alternatives green */
  --radius: 14px;
  --max: 1120px;
  --shadow: 0 10px 30px rgba(0,0,0,.25);
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.wrap{
  max-width: var(--max);
  margin: 0 auto;
  padding: 40px 28px 70px;
}

/* Header mirrors cover: mark at left + clean nav */
.topbar{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 22px;
  border: 1px solid var(--line2);
  border-radius: var(--radius);
  background: rgba(255,255,255,.03);
  box-shadow: var(--shadow);
}

.brand{
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 240px;
}

.brand-mark{
  width: 56px;
  height: 44px;
  display: grid;
  place-items: center;
}

.brand-mark img{
  width: 56px;
  height: auto;
  display: block;
}

.brand-title{
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.brand-title strong{
  font-size: 14px;
  letter-spacing: .4px;
  color: var(--text);
}
.brand-title span{
  font-size: 12px;
  color: var(--muted2);
}

/* Nav = GREY ONLY (keeps the "one green use" rule clean) */
nav{
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

nav a{
  position: relative;
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
}

nav a:hover{
  color: var(--text);
  border-color: rgba(255,255,255,.08);
  background: rgba(255,255,255,.03);
}

/* Active state remains GREY (not green) */
nav a[aria-current="page"]{
  color: var(--text);
  border-color: rgba(255,255,255,.10);
  background: rgba(255,255,255,.04);
}
nav a[aria-current="page"]::after{
  content:"";
  position:absolute;
  left: 10px;
  right: 10px;
  bottom: 4px;
  height: 2px;
  background: rgba(255,255,255,.30); /* grey underline */
  border-radius: 999px;
}

/* Cover-mirror vertical rail (like your cover’s left line) */
.cover-rail{
  margin-top: 26px;
  position: relative;
  padding-left: 28px;
}
.cover-rail::before{
  content:"";
  position:absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: rgba(255,255,255,.22);
  border-radius: 999px;
}

/* Hero */
.hero{
  padding: 90px 0 38px;
}
h1{
  margin: 0 0 14px;
  font-size: clamp(38px, 5vw, 58px);
  letter-spacing: .2px;
  line-height: 1.1;
}
.subtitle{
  margin: 0;
  font-size: 20px;
  color: var(--muted);
  max-width: 840px;
}

/* THE ONE GREEN ELEMENT ON COVER PAGE ONLY */
.accent-underline{
  margin-top: 18px;
  width: 140px;
  height: 8px;
  background: var(--na-green);
  border-radius: 999px;
}

/* Interior pages: ONE green cue tick only */
.section-cue{
  display:flex;
  align-items:center;
  gap: 12px;
  margin: 38px 0 18px;
}
.section-cue .tick{
  width: 54px;
  height: 8px;
  background: var(--na-green); /* THE ONE GREEN ELEMENT ON INTERIOR PAGES */
  border-radius: 999px;
}
.section-cue .label{
  color: var(--muted);
  font-size: 13px;
  letter-spacing: .4px;
  text-transform: uppercase;
}

/* Panels */
.panel{
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius);
  background: rgba(255,255,255,.04);
  box-shadow: var(--shadow);
  padding: 22px;
}

.grid{
  display:grid;
  gap: 18px;
  grid-template-columns: 1.35fr .65fr;
}
@media (max-width: 980px){
  .grid{ grid-template-columns: 1fr; }
}

h2{
  margin: 0 0 10px;
  font-size: 20px;
  letter-spacing: .2px;
}
p{ margin: 0 0 12px; color: var(--muted); }

ul{
  margin: 10px 0 0 18px;
  color: var(--muted);
}
li{ margin: 6px 0; }

/* Checklist table */
.table{
  width:100%;
  border-collapse: collapse;
  margin-top: 10px;
  overflow:hidden;
  border-radius: 12px;
}
.table th, .table td{
  padding: 12px 12px;
  border-bottom: 1px solid rgba(255,255,255,.10);
  vertical-align: top;
}
.table th{
  text-align:left;
  font-size: 13px;
  color: var(--muted2);
  letter-spacing: .4px;
  text-transform: uppercase;
  background: rgba(255,255,255,.03);
}
.table td{
  color: var(--muted);
  font-size: 14px;
}
.badge{
  display:inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.16);
  color: var(--muted2);
  font-size: 12px;
}

/* Footer mirrors cover footer text + page label */
.site-footer{
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.12);
  color: var(--muted2);
  font-size: 13px;
  display:flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.page-num{
  opacity: .9;
}

@media print{
  body{ background: #fff; color:#111; }
  .topbar, nav { box-shadow:none; }
  .panel{ box-shadow:none; }
}