/* =======================================================================
   HEARTWOOD TREE — "1920s Golden Age of Science" monograph system
   Science & Nature in balance · antique natural-history journal
   ===================================================================== */
:root{
  /* --- brand greens (warmed / aged) --- */
  --forest:#20402B;
  --forest-800:#193320;
  --forest-900:#112619;
  --botanical:#33543A;
  --teal:#2FAE96;
  --teal-600:#1C8771;
  --teal-50:#E4EFE6;
  --moss:#6E8B5E;
  /* --- aged paper / parchment --- */
  --paper:#F0E6CF;
  --paper-2:#E7DBBE;
  --paper-3:#DECFAC;
  --paper-card:#F6EFDC;
  /* --- ink / sepia / brass --- */
  --ink:#2C2317;
  --ink-soft:#473b29;
  --muted:#736744;
  --sepia:#5A4A33;
  --gold:#9A7733;
  --gold-soft:#B89A57;
  /* --- lines --- */
  --line:rgba(44,35,23,.22);
  --line-strong:rgba(44,35,23,.4);
  --line-light:rgba(240,230,207,.22);
  /* --- type (period) --- */
  --serif:'Playfair Display','Times New Roman',Georgia,serif;   /* engraved display */
  --sans:'EB Garamond',Georgia,'Times New Roman',serif;          /* old-style body/UI */
  --mono:'IM Fell English','EB Garamond',Georgia,serif;          /* letterpress labels/figures */
  --display:'Playfair Display',Georgia,serif;
  /* --- layout --- */
  --wrap:1240px;
  --radius:3px;
  --radius-lg:5px;
  --shadow:0 24px 60px -30px rgba(17,30,18,.55);
  --shadow-sm:0 14px 34px -22px rgba(17,30,18,.46);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--sans);color:var(--ink);
  background-color:var(--paper);
  background-image:
    url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20viewBox%3D%220%200%2064%2064%22%20fill%3D%22none%22%3E%3Ccircle%20cx%3D%2232%22%20cy%3D%2232%22%20r%3D%2228.5%22%20stroke%3D%22%232e4d38%22%20stroke-width%3D%222.6%22/%3E%3Cpath%20d%3D%22M32%2014c-9%204-13%2012-11%2021%207-1%2012-6%2013-13%22%20stroke%3D%22%232e4d38%22%20stroke-width%3D%222.6%22%20stroke-linejoin%3D%22round%22/%3E%3Cpath%20d%3D%22M32%2050c9-4%2013-12%2011-21-7%201-12%206-13%2013%22%20stroke%3D%22%232e4d38%22%20stroke-width%3D%222.6%22%20stroke-linejoin%3D%22round%22/%3E%3Cpath%20d%3D%22M32%2014v36%22%20stroke%3D%22%232e4d38%22%20stroke-width%3D%222%22%20stroke-linecap%3D%22round%22%20stroke-dasharray%3D%221%205%22/%3E%3C/svg%3E'http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.06'/%3E%3C/svg%3E"),
    radial-gradient(circle at 18% 12%, rgba(120,90,40,.06), transparent 26%),
    radial-gradient(circle at 82% 78%, rgba(120,90,40,.05), transparent 30%),
    radial-gradient(circle at 60% 40%, rgba(90,74,51,.035), transparent 40%);
  font-size:20px;line-height:1.62;-webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.06;margin:0;letter-spacing:-.005em;color:var(--forest)}
p{margin:0}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 32px}
.wrap-narrow{max-width:1040px;margin:0 auto;padding:0 32px}
.section{padding:118px 0}
.section--tight{padding:84px 0}

/* grounds */
.bg-paper{background:var(--paper)}
.bg-paper-2{background:var(--paper-2)}
.bg-forest{background-color:var(--forest);color:#EAF1E6;
  background-image:url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20viewBox%3D%220%200%2064%2064%22%20fill%3D%22none%22%3E%3Ccircle%20cx%3D%2232%22%20cy%3D%2232%22%20r%3D%2228.5%22%20stroke%3D%22%232e4d38%22%20stroke-width%3D%222.6%22/%3E%3Cpath%20d%3D%22M32%2014c-9%204-13%2012-11%2021%207-1%2012-6%2013-13%22%20stroke%3D%22%232e4d38%22%20stroke-width%3D%222.6%22%20stroke-linejoin%3D%22round%22/%3E%3Cpath%20d%3D%22M32%2050c9-4%2013-12%2011-21-7%201-12%206-13%2013%22%20stroke%3D%22%232e4d38%22%20stroke-width%3D%222.6%22%20stroke-linejoin%3D%22round%22/%3E%3Cpath%20d%3D%22M32%2014v36%22%20stroke%3D%22%232e4d38%22%20stroke-width%3D%222%22%20stroke-linecap%3D%22round%22%20stroke-dasharray%3D%221%205%22/%3E%3C/svg%3E'http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E")}
.bg-forest h1,.bg-forest h2,.bg-forest h3,.bg-forest h4{color:#fff}

/* =================== ENGRAVED LABEL (replaces mono "plate") =============== */
.plate{
  font-family:var(--mono);font-style:italic;font-weight:400;font-size:1rem;letter-spacing:.04em;
  color:var(--gold);display:inline-flex;align-items:center;gap:12px;margin:0 0 22px;
}
.plate::before{content:"";width:30px;height:1px;background:var(--gold);display:inline-block}
.plate--plain::before{display:none}
.plate--center{justify-content:center}
.bg-forest .plate{color:var(--gold-soft)}
.bg-forest .plate::before{background:var(--gold-soft)}
/* small-caps catalog label variant */
.label-sc{font-family:var(--sans);font-weight:600;font-variant:small-caps;letter-spacing:.18em;text-transform:lowercase;color:var(--gold);font-size:.9rem}

.eyebrow{font-family:var(--mono);font-style:italic;font-weight:400;font-size:1rem;letter-spacing:.04em;
  color:var(--gold);display:inline-flex;align-items:center;gap:12px;margin:0 0 22px}
.eyebrow::before{content:"";width:30px;height:1px;background:var(--gold)}
.eyebrow--center{justify-content:center}
.bg-forest .eyebrow{color:var(--gold-soft)}
.bg-forest .eyebrow::before{background:var(--gold-soft)}

/* =================== DISPLAY SIZES =============== */
.display{font-size:clamp(2.8rem,6vw,5.4rem);line-height:1;font-weight:700}
.h2{font-size:clamp(2.1rem,3.7vw,3.5rem);font-weight:700}
.h3{font-size:clamp(1.45rem,2vw,1.95rem);font-weight:600}
.lead{font-size:clamp(1.12rem,1.5vw,1.34rem);color:var(--ink-soft);line-height:1.6;max-width:64ch}
.bg-forest .lead{color:#C6D4C7}
em.it{font-style:italic;color:var(--gold)}
.bg-forest em.it{color:var(--gold-soft)}

/* =================== BUTTONS =============== */
.btn{
  display:inline-flex;align-items:center;gap:10px;font-family:var(--sans);font-weight:600;
  font-size:1.04rem;letter-spacing:.02em;padding:13px 28px;border-radius:2px;cursor:pointer;border:1.5px solid transparent;
  transition:transform .22s cubic-bezier(.2,.7,.3,1),box-shadow .22s,background .22s,color .22s,border-color .22s;
  white-space:nowrap;
}
.btn svg{width:18px;height:18px}
.btn-primary{background:var(--forest);color:#F0E6CF;box-shadow:0 12px 26px -16px rgba(17,30,18,.7);border-color:var(--forest)}
.btn-primary:hover{background:var(--forest-800);transform:translateY(-3px);box-shadow:0 20px 36px -16px rgba(17,30,18,.8)}
.btn-gold{background:var(--gold);color:#2A2008;border-color:var(--gold)}
.btn-gold:hover{background:#AD893F;transform:translateY(-3px)}
.btn-ink{background:var(--forest);color:#fff}
.btn-ink:hover{background:var(--forest-800);transform:translateY(-3px)}
.btn-outline{background:transparent;border-color:var(--forest);color:var(--forest)}
.btn-outline:hover{background:var(--forest);color:var(--paper);transform:translateY(-3px)}
.btn-ghost-light{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.45);color:#fff}
.btn-ghost-light:hover{background:var(--paper);color:var(--forest);border-color:var(--paper);transform:translateY(-3px)}
.btn-lg{padding:16px 36px;font-size:1.1rem}

/* =================== ENGRAVING PLATE SVG =============== */
.plate-svg{display:inline-block;line-height:0;color:var(--forest)}
.plate-svg svg{display:block;width:100%;height:100%}
.duality{display:inline-block;line-height:0}
.duality svg{display:block;width:100%;height:100%}

/* specimen frame around imagery / plates */
.specimen{position:relative;background:var(--paper-card);border:1px solid var(--line-strong);padding:14px;box-shadow:var(--shadow-sm)}
.specimen::after{content:"";position:absolute;inset:6px;border:1px solid var(--line);pointer-events:none}
.specimen .specimen-cap{font-family:var(--mono);font-style:italic;font-size:.92rem;color:var(--muted);text-align:center;padding-top:12px;letter-spacing:.02em}

/* aged image treatment (for the few antique plates kept) */
.aged{filter:sepia(.28) saturate(.85) contrast(1.02)}

/* =================== TOP UTILITY BAR =============== */
.utility{background:var(--forest-900);color:#c2d2c4;font-size:.92rem;font-family:var(--sans)}
.utility .wrap{display:flex;align-items:center;justify-content:space-between;height:42px;gap:20px}
.utility a{color:#c2d2c4;transition:color .2s}
.utility a:hover{color:var(--gold-soft)}
.utility .u-left{display:flex;align-items:center;gap:18px}
.utility .u-right{display:flex;align-items:center;gap:22px}
.utility .u-item{display:flex;align-items:center;gap:8px;white-space:nowrap}
.utility .u-phone{color:#fff;font-weight:600}
.utility .u-phone:hover{color:var(--gold-soft)}
.utility .u-tag{font-family:var(--mono);font-style:italic;font-size:.95rem;letter-spacing:.04em;color:var(--gold-soft);white-space:nowrap}
@media(max-width:1080px){.utility .u-tag{font-size:.85rem}}
@media(max-width:760px){.utility .u-left{display:none}}
.utility .u-soc{display:flex;gap:14px}
.utility svg{width:15px;height:15px;display:block}
@media(max-width:900px){.utility .u-right .u-item.hide-sm{display:none}.utility{font-size:.85rem}}

/* =================== HEADER =============== */
.masthead{position:sticky;top:0;z-index:100;background:var(--paper);
  border-bottom:1px solid var(--line-strong);transition:box-shadow .25s}
.masthead .wrap{display:flex;align-items:center;justify-content:space-between;gap:14px;height:92px;transition:height .25s}
.masthead.shrunk{box-shadow:0 12px 30px -24px rgba(17,30,18,.6)}
.masthead.shrunk .wrap{height:70px}
.brand{display:flex;align-items:center;flex-shrink:0;gap:13px}
.brand img{height:52px;width:auto;transition:height .25s;mix-blend-mode:multiply}
.masthead.shrunk .brand img{height:42px}
.brand .brand-wordmark{display:flex;flex-direction:column;line-height:1}
.brand .brand-wordmark b{font-family:var(--serif);font-size:1.2rem;color:var(--forest);font-weight:700;letter-spacing:.005em}
.brand .brand-wordmark span{font-family:var(--mono);font-style:italic;font-size:.82rem;letter-spacing:.06em;color:var(--gold);margin-top:3px}
@media(max-width:1330px){.brand .brand-wordmark{display:none}}

.nav{display:flex;align-items:center;gap:0}
.nav-item{position:relative}
.nav-link{display:flex;align-items:center;gap:5px;font-family:var(--sans);font-weight:600;font-size:1.04rem;
  white-space:nowrap;color:var(--ink);padding:10px 12px;border-radius:2px;cursor:pointer;transition:color .2s,background .2s}
.nav-link:hover{color:var(--teal-600);background:rgba(51,84,58,.08)}
.nav-link.active{color:var(--teal-600)}
.nav-link.active::after{content:"";position:absolute;left:12px;right:12px;bottom:3px;height:1.5px;background:var(--gold);border-radius:2px}
.nav-link .caret{width:12px;height:12px;transition:transform .25s}
.nav-item:hover .caret{transform:rotate(180deg)}
.nav-link.feature{color:var(--teal-600);font-weight:700}

.dropdown{position:absolute;top:100%;left:0;min-width:290px;background:var(--paper-card);border:1px solid var(--line-strong);
  border-radius:3px;box-shadow:var(--shadow);padding:10px;opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .2s,transform .2s,visibility .2s;z-index:30}
.nav-item:hover .dropdown{opacity:1;visibility:visible;transform:translateY(6px)}
.dropdown a{display:block;padding:10px 13px;border-radius:2px;font-weight:500;font-size:1.02rem;color:var(--ink);transition:background .18s,color .18s}
.dropdown a:hover{background:var(--paper-2);color:var(--teal-600)}
.dropdown a small{display:block;font-family:var(--mono);font-style:italic;font-size:.86rem;color:var(--muted);font-weight:400;margin-top:2px}

.head-cta{display:flex;align-items:center;gap:18px;flex-shrink:0}
.masthead .head-cta .btn{padding:11px 20px;font-size:1rem}

.burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.burger span{width:26px;height:2.4px;background:var(--forest);border-radius:2px;transition:.25s}
@media(max-width:1240px){.nav{display:none}.burger{display:flex}}

.mobile-menu{position:fixed;inset:0;z-index:200;background:var(--forest);color:#fff;padding:28px 32px;
  transform:translateX(100%);transition:transform .35s cubic-bezier(.2,.7,.3,1);overflow-y:auto}
.mobile-menu.open{transform:translateX(0)}
.mobile-menu .mm-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px}
.mobile-menu .mm-top img{filter:none !important;background:#fff;padding:7px 9px;border:1px solid rgba(184,154,87,.45);border-radius:3px}
.mobile-menu .mm-close{background:none;border:0;color:#fff;font-size:2rem;cursor:pointer;line-height:1}
.mobile-menu a{display:block;font-family:var(--serif);font-size:1.55rem;padding:13px 0;border-bottom:1px solid var(--line-light);color:#fff}

/* =================== FOOTER =============== */
.footer{background:var(--forest-900);color:#b6c9bb;padding:84px 0 34px;font-size:1rem}
.footer h4{font-family:var(--mono);font-style:italic;font-weight:400;font-size:1.08rem;letter-spacing:.03em;color:var(--gold-soft);margin-bottom:20px}
.footer-brand{display:flex;flex-direction:column}
.footer-brand .fb-top{display:flex;align-items:center;gap:13px;margin-bottom:20px}
.footer-brand img{height:50px;width:auto;background:#fff;padding:8px 11px;border:1px solid rgba(184,154,87,.45);border-radius:3px}
.footer-brand .fb-name{font-family:var(--serif);font-size:1.4rem;color:#fff;font-weight:700}
.footer-brand p{color:#94ab99;max-width:38ch;line-height:1.7}
.footer ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.footer ul a{color:#b6c9bb;transition:color .2s}
.footer ul a:hover{color:var(--gold-soft)}
.footer .f-contact div{margin-bottom:12px;line-height:1.5}
.footer .f-soc{display:flex;gap:13px;margin-top:8px}
.footer .f-soc a{width:39px;height:39px;border:1px solid var(--line-light);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:.2s}
.footer .f-soc a:hover{background:var(--gold);border-color:var(--gold);color:#2A2008}
.footer .f-soc svg{width:16px;height:16px}
.footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1.2fr;gap:46px}
.footer-bottom{border-top:1px solid var(--line-light);margin-top:56px;padding-top:26px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;color:#86a08c;font-size:.92rem;font-family:var(--mono);font-style:italic;letter-spacing:.02em}
.footer-bottom a:hover{color:var(--gold-soft)}
@media(max-width:880px){.footer-grid{grid-template-columns:1fr 1fr;gap:36px}}
@media(max-width:540px){.footer-grid{grid-template-columns:1fr}}

/* =================== REVEAL =============== */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .9s cubic-bezier(.2,.7,.3,1),transform .9s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}.reveal.d3{transition-delay:.24s}.reveal.d4{transition-delay:.32s}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* =================== ATOMS =============== */
.pill{display:inline-flex;align-items:center;gap:9px;background:rgba(154,119,51,.12);color:var(--gold);
  font-family:var(--mono);font-style:italic;font-weight:400;font-size:1rem;letter-spacing:.03em;padding:7px 16px;border-radius:2px;border:1px solid rgba(154,119,51,.34)}
.bg-forest .pill{background:rgba(184,154,87,.12);color:var(--gold-soft);border-color:rgba(184,154,87,.32)}

.rule2{border:0;border-top:1px solid var(--line-strong);border-bottom:1px solid var(--line-strong);height:3px;margin:0}
.hair{height:1px;background:var(--line);border:0;margin:0}

/* ornamental divider helper */
.ornament{color:var(--gold);width:240px;max-width:60%;height:24px;margin:0 auto}
.ornament svg{display:block;width:100%;height:100%}

/* section heading block */
.sec-head{text-align:center;max-width:800px;margin:0 auto}
.sec-head h2{margin-bottom:18px}
.sec-head .lead{margin:0 auto}
.sec-head .ornament{margin-bottom:26px}

/* specimen caption */
.caption{font-family:var(--mono);font-style:italic;font-size:.95rem;color:var(--muted);margin-top:12px;display:flex;gap:10px;align-items:center}
.caption::before{content:"";width:20px;height:1px;background:var(--gold)}

/* classification / catalog card */
.catalog{position:relative;background:var(--paper-card);border:1px solid var(--line-strong);padding:30px 28px}
.catalog::after{content:"";position:absolute;inset:6px;border:1px solid var(--line);pointer-events:none}

/* stars */
.stars{color:var(--gold);letter-spacing:3px;font-size:1.05rem;line-height:1}