/* Birchbark Operating Partners — brand palette per guidelines */
:root {
  --pearl: #F2EFE6;      /* Neutral Pearl White */
  --stack: #879486;      /* Stack */
  --midnight: #2C3B31;   /* Midnight Green */
  --graphite: #6E7180;
  --smoke: #D3D6E0;
  --midnight-soft: rgba(44, 59, 49, 0.72);
  --pearl-soft: rgba(242, 239, 230, 0.75);
  --line: rgba(44, 59, 49, 0.14);
  --line-light: rgba(242, 239, 230, 0.18);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Geist", -apple-system, "Helvetica Neue", Arial, sans-serif;
  background: var(--pearl);
  color: var(--midnight);
  line-height: 1.6;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

h1, h2, h3 { letter-spacing: -0.03em; line-height: 1.12; font-weight: 500; }

a { color: inherit; }

/* ---------- Header ---------- */
header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--pearl) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; max-width: 1120px; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--midnight); }
.brand .mark { width: 34px; height: 26px; display: block; }
.brand .word { display: flex; flex-direction: column; line-height: 1.05; }
.brand .word b { font-weight: 600; font-size: 17px; letter-spacing: 0.02em; }
.brand .word span { font-size: 8.5px; letter-spacing: 0.32em; font-weight: 400; margin-top: 2px; }
nav.links { display: flex; gap: 28px; align-items: center; }
nav.links a { text-decoration: none; font-size: 15px; color: var(--midnight-soft); transition: color .15s; }
nav.links a:hover, nav.links a.active { color: var(--midnight); }
.btn {
  display: inline-block; text-decoration: none; font-size: 15px; font-weight: 500;
  padding: 11px 22px; border-radius: 999px; transition: opacity .15s, background .15s;
}
.btn-dark { background: var(--midnight); color: var(--pearl); }
.btn-dark:hover { opacity: 0.88; }
.btn-light { background: var(--pearl); color: var(--midnight); }
.btn-light:hover { opacity: 0.88; }
.btn-ghost { border: 1px solid var(--line); color: var(--midnight); }
.btn-ghost:hover { background: rgba(44,59,49,0.05); }

/* ---------- Transparent header over photo hero ---------- */
header.overlay {
  position: absolute; top: 0; left: 0; right: 0;
  background: transparent; backdrop-filter: none;
  border-bottom: 1px solid rgba(242,239,230,0.16);
}
header.overlay .brand { color: var(--pearl); }
header.overlay nav.links a:not(.btn) { color: rgba(242,239,230,0.8); }
header.overlay nav.links a:not(.btn):hover,
header.overlay nav.links a.active:not(.btn) { color: var(--pearl); }

/* ---------- Photo hero (full-bleed) ---------- */
.hero-photo {
  position: relative; color: var(--pearl);
  min-height: 92vh; display: flex; align-items: center;
  background: linear-gradient(rgba(24,33,28,0.68), rgba(24,33,28,0.88)),
              url("../assets/img/forest.jpg") center / cover no-repeat;
}
.hero-photo .hero { padding: 150px 0 110px; }
.hero-photo .hero h1 { color: #FFFFFF; text-shadow: 0 2px 28px rgba(0,0,0,0.5); }
.hero-photo .hero p.lede { color: #F7F5EE; font-weight: 500; text-shadow: 0 2px 18px rgba(0,0,0,0.55); }
.hero-photo .hero .eyebrow { color: #B7C2B5; }
.btn-ghost-light { border: 1px solid rgba(242,239,230,0.45); color: var(--pearl); }
.btn-ghost-light:hover { background: rgba(242,239,230,0.12); }

/* ---------- Photo bands ---------- */
.photo-band {
  position: relative; color: var(--pearl); padding: 110px 0;
  background: linear-gradient(rgba(24,33,28,0.5), rgba(24,33,28,0.66)),
              var(--band-img, url("../assets/img/canoe.jpg")) center / cover no-repeat;
}
.photo-band h2 { font-size: clamp(28px, 4vw, 44px); max-width: 22ch; }
.photo-band p { color: var(--pearl); opacity: 0.95; max-width: 54ch; margin-top: 16px; font-size: 17px; text-shadow: 0 1px 14px rgba(0,0,0,0.35); }
.photo-band .eyebrow { color: var(--pearl-soft); }

.photo-strip { height: 420px; background: center / cover no-repeat; }
@media (max-width: 860px) { .photo-strip { height: 260px; } .hero-photo { min-height: 70vh; } }

/* ---------- Hero ---------- */
.hero { padding: 96px 0 88px; }
.eyebrow {
  font-size: 13px; letter-spacing: 0.28em; text-transform: uppercase;
  color: var(--stack); font-weight: 500; margin-bottom: 22px;
}
.hero h1 { font-size: clamp(38px, 6vw, 68px); max-width: 17ch; }
.hero p.lede { margin-top: 26px; font-size: 19px; max-width: 56ch; color: var(--midnight-soft); }
.cta-row { margin-top: 36px; display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Sections ---------- */
section { padding: 76px 0; }
.section-head { margin-bottom: 44px; }
.section-head h2 { font-size: clamp(28px, 4vw, 42px); max-width: 24ch; }
.section-head p { margin-top: 14px; color: var(--midnight-soft); max-width: 60ch; font-size: 17px; }

.grid { display: grid; gap: 20px; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  border: 1px solid var(--line); border-radius: 14px; padding: 28px;
  background: rgba(255,255,255,0.35);
}
.card h3 { font-size: 20px; margin-bottom: 10px; }
.card p { color: var(--midnight-soft); font-size: 15.5px; }
.card .num { font-size: 13px; color: var(--stack); letter-spacing: 0.2em; margin-bottom: 14px; display: block; }

/* ---------- Dark band ---------- */
.band { background: var(--midnight); color: var(--pearl); padding: 88px 0; }
.band .eyebrow { color: var(--stack); }
.band h2 { font-size: clamp(30px, 4.5vw, 48px); max-width: 20ch; }
.band p { color: var(--pearl-soft); }
.band .card { border-color: var(--line-light); background: rgba(242,239,230,0.04); }
.band .card p { color: var(--pearl-soft); }

/* ---------- Diff list ---------- */
.diff { display: grid; grid-template-columns: repeat(3, 1fr); gap: 36px; margin-top: 48px; }
.diff h3 { font-size: 19px; margin-bottom: 10px; }
.diff p { font-size: 15.5px; }
.diff .rule { width: 34px; height: 3px; background: var(--stack); border-radius: 2px; margin-bottom: 18px; }

/* ---------- CTA band ---------- */
.cta-final { text-align: center; padding: 96px 0; }
.cta-final h2 { font-size: clamp(30px, 4.5vw, 46px); margin: 0 auto; max-width: 22ch; }
.cta-final p { margin: 18px auto 0; max-width: 52ch; color: var(--midnight-soft); }
.cta-final .btn { margin-top: 34px; }

/* ---------- Services page ---------- */
.svc { display: grid; grid-template-columns: 240px 1fr; gap: 32px; padding: 40px 0; border-top: 1px solid var(--line); }
.svc:last-of-type { border-bottom: 1px solid var(--line); }
.svc .num { color: var(--stack); font-size: 14px; letter-spacing: 0.2em; }
.svc h3 { font-size: 24px; margin-top: 6px; }
.svc p { color: var(--midnight-soft); max-width: 62ch; }
.svc ul { margin: 14px 0 0 18px; color: var(--midnight-soft); font-size: 15.5px; }
.svc ul li { margin-bottom: 6px; }

/* ---------- Engagement tiers ---------- */
.tier {
  display: grid; grid-template-columns: 70px 260px 1fr; gap: 24px; align-items: center;
  border-radius: 14px; padding: 30px 34px; margin-bottom: 16px;
  border: 1px solid var(--line);
}
.tier .num { font-size: 14px; letter-spacing: 0.15em; color: var(--midnight-soft); }
.tier h3 { font-size: 24px; }
.tier .sub { font-size: 13.5px; font-style: italic; letter-spacing: 0.06em; color: var(--midnight-soft); margin-top: 6px; }
.tier p { font-size: 16px; color: var(--midnight-soft); }
.tier-1 { background: rgba(255,255,255,0.6); }
.tier-2 { background: #E9E5D8; }
.tier-3 { background: #C9D1C8; }
.tier-4 { background: var(--midnight); border-color: var(--midnight); color: var(--pearl); }
.tier-4 .num, .tier-4 .sub { color: rgba(242,239,230,0.65); }
.tier-4 p { color: var(--pearl-soft); }
@media (max-width: 860px) {
  .tier { grid-template-columns: 1fr; gap: 8px; }
}

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 56px; align-items: start; }
.headshot {
  aspect-ratio: 4/5; border-radius: 14px; background: var(--midnight);
  display: flex; align-items: center; justify-content: center; color: var(--stack);
  font-size: 14px; letter-spacing: 0.15em; text-transform: uppercase;
}
.values { margin-top: 8px; }
.values .card { margin-bottom: 14px; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: start; }
form label { display: block; font-size: 14px; font-weight: 500; margin: 18px 0 6px; }
form input, form textarea {
  width: 100%; padding: 12px 14px; font-size: 15.5px; font-family: inherit;
  border: 1px solid var(--line); border-radius: 10px; background: rgba(255,255,255,0.5);
  color: var(--midnight);
}
form input:focus, form textarea:focus { outline: 2px solid var(--stack); border-color: transparent; }
form button { margin-top: 24px; border: none; cursor: pointer; font-family: inherit; }
.contact-links { display: flex; flex-direction: column; gap: 14px; margin-top: 28px; }
.contact-links a { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-size: 16px; }
.contact-links a:hover { text-decoration: underline; }

/* ---------- Footer ---------- */
footer { background: var(--midnight); color: var(--pearl); padding: 56px 0 40px; border-top: 1px solid var(--line-light); }
.foot { display: flex; justify-content: space-between; align-items: flex-start; gap: 32px; flex-wrap: wrap; }
.foot .brand { color: var(--pearl); }
.foot nav { display: flex; gap: 22px; }
.foot nav a { text-decoration: none; font-size: 14.5px; color: var(--pearl-soft); }
.foot nav a:hover { color: var(--pearl); }
.foot .fine { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--line-light); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13.5px; color: var(--pearl-soft); }

/* ---------- Page hero (interior pages) ---------- */
.page-hero { padding: 80px 0 56px; }
.page-hero h1 { font-size: clamp(34px, 5vw, 56px); }
.page-hero p { margin-top: 18px; font-size: 18px; color: var(--midnight-soft); max-width: 58ch; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .grid.cols-3, .diff { grid-template-columns: 1fr; }
  .grid.cols-2, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .svc { grid-template-columns: 1fr; gap: 8px; }
  nav.links { gap: 18px; }
  nav.links a:not(.btn) { display: none; }
  .hero { padding: 64px 0 56px; }
}