/* ===== CalcPine design system ===== */
:root{
  --pine:#1F6F54; --pine-dark:#185a44; --pine-2:#2b8367; --slate:#334155; --slate-2:#64748b;
  --sand:#E8B44F; --bg:#F8FAF9; --card:#fff; --border:#e5e9e7; --pine-tint:#eaf3ef;
  --radius:14px; --shadow:0 1px 3px rgba(16,40,32,.06),0 8px 24px rgba(16,40,32,.06);
  --maxw:820px; --wide:1140px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--slate);
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  line-height:1.65;font-size:17px;-webkit-font-smoothing:antialiased}
a{color:var(--pine);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{color:var(--slate);line-height:1.25;letter-spacing:-.01em}
h1{font-size:2rem;margin:.2em 0 .4em}
h2{font-size:1.4rem;margin:2em 0 .6em;padding-bottom:.3em;border-bottom:2px solid var(--pine-tint)}
h3{font-size:1.12rem;margin:1.4em 0 .4em}
img{max-width:100%}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.wide{max-width:var(--wide)}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--border)}
.bar{display:flex;align-items:center;gap:18px;height:64px;max-width:var(--wide);position:relative}
.brand{display:flex;align-items:center;flex-shrink:0}
.brand img{height:38px;width:auto;display:block}
.nav{display:flex;gap:22px;margin-left:8px}
.nav a{color:var(--slate);font-weight:600;font-size:.95rem}
.search{margin-left:auto;display:flex;align-items:center;background:var(--bg);border:1px solid var(--border);
  border-radius:999px;padding:7px 14px;gap:8px;min-width:210px}
.search input{border:0;background:transparent;outline:0;width:100%;font-size:.92rem;color:var(--slate)}
.hamb{display:none;margin-left:auto;cursor:pointer;padding:8px}
.hamb span{display:block;width:22px;height:2px;background:var(--slate);margin:4px 0;border-radius:2px}
.nt{position:absolute;opacity:0;pointer-events:none}

/* Breadcrumb */
.crumb{font-size:.85rem;color:var(--slate-2);padding:16px 0 0}
.crumb a{color:var(--slate-2)}

/* Buttons */
.btn{border:0;border-radius:10px;padding:12px 20px;font-size:1rem;font-weight:700;cursor:pointer;display:inline-block}
.btn-primary{background:var(--pine);color:#fff}
.btn-primary:hover{background:var(--pine-dark);text-decoration:none}
.btn-ghost{background:#fff;color:var(--pine);border:1px solid var(--border)}

/* Hero (home) */
.hero{background:linear-gradient(180deg,#fff, var(--bg));border-bottom:1px solid var(--border);padding:56px 0 44px;text-align:center}
.hero h1{font-size:2.5rem;margin:0 0 .3em}
.hero p{font-size:1.15rem;color:var(--slate-2);max-width:620px;margin:0 auto 26px}
.herosearch{display:flex;max-width:520px;margin:0 auto;background:#fff;border:1px solid var(--border);
  border-radius:999px;box-shadow:var(--shadow);padding:6px 6px 6px 18px;align-items:center;gap:10px}
.herosearch input{border:0;outline:0;flex:1;font-size:1rem;background:transparent}
.herosearch .btn{padding:11px 22px}

/* Category tiles / cards */
.section{padding:40px 0}
.section h2{border:0;text-align:center;margin-bottom:.2em}
.section .subtle{text-align:center;color:var(--slate-2);margin:0 0 26px}
.tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.tile{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.tile:hover{border-color:var(--pine);text-decoration:none}
.tile .ic{width:44px;height:44px;border-radius:12px;background:var(--pine-tint);display:flex;align-items:center;justify-content:center;margin-bottom:12px;font-size:22px}
.tile h3{margin:.1em 0 .3em;color:var(--slate)}
.tile p{margin:0;color:var(--slate-2);font-size:.92rem}
.grid-links{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.clink{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--border);border-radius:10px;
  padding:14px 16px;font-weight:600;color:var(--slate)}
.clink:hover{border-color:var(--pine);text-decoration:none}
.clink.soon{color:var(--slate-2);cursor:default;opacity:.75}
.clink .tag{margin-left:auto;font-size:.72rem;font-weight:700;color:var(--pine);background:var(--pine-tint);padding:3px 8px;border-radius:999px}
.clink.soon .tag{color:var(--slate-2);background:var(--bg)}
.clink.col{flex-direction:column;align-items:flex-start;gap:4px}
.clink.col .t{font-weight:600}
.clink.col .d{font-weight:400;font-size:.82rem;color:var(--slate-2);line-height:1.35}
.quickans{background:var(--pine-tint);border-left:3px solid var(--pine);border-radius:8px;padding:12px 16px;margin:1.1em 0;font-size:1.02rem;line-height:1.5}
.quickans b{color:var(--pine)}

/* Content typography */
.lead{font-size:1.08rem}
table{width:100%;border-collapse:collapse;margin:1em 0;font-size:.95rem}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border)}
th{background:var(--pine-tint);color:var(--slate)}
.prose h2{margin-top:1.6em}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.disclaimer{background:#fff8ec;border:1px solid #f0dcae;border-radius:10px;padding:12px 16px;font-size:.9rem;margin:1.4em 0}
details{background:#fff;border:1px solid var(--border);border-radius:10px;margin:10px 0;padding:0 18px}
details summary{cursor:pointer;font-weight:600;padding:14px 0;list-style:none}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";float:right;color:var(--pine);font-weight:700}
details[open] summary::after{content:"–"}
details .a{padding:0 0 14px;color:var(--slate)}

/* Footer */
.site-footer{background:var(--slate);color:#cbd5e1;margin-top:48px;padding:40px 0 24px}
.fcols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:28px;max-width:var(--wide);margin:0 auto}
.site-footer h4{color:#fff;font-size:.95rem;margin:0 0 10px}
.site-footer a{color:#cbd5e1;font-size:.9rem;display:block;margin:6px 0}
.site-footer a:hover{color:#fff}
.fbrand img{height:34px}
.fbrand p{font-size:.88rem;color:#94a3b8;margin-top:10px;max-width:280px}
.copy{border-top:1px solid #475569;margin-top:28px;padding-top:16px;font-size:.82rem;color:#94a3b8;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;max-width:var(--wide);margin-left:auto;margin-right:auto}

/* Calculator components */
.calc{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin:14px 0 8px}
.field{margin-bottom:16px}
.field label{display:block;font-weight:600;font-size:.92rem;margin-bottom:6px;color:var(--slate)}
.field input[type=number],.field select{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:10px;font-size:1rem;color:var(--slate);background:#fff}
.field input:focus,.field select:focus{outline:2px solid var(--pine);border-color:var(--pine)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.seg{display:inline-flex;background:var(--bg);border:1px solid var(--border);border-radius:999px;padding:3px}
.seg button{border:0;background:none;padding:7px 16px;border-radius:999px;cursor:pointer;font-weight:600;font-size:.9rem;color:var(--slate-2)}
.seg button.active{background:var(--pine);color:#fff}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.result{margin-top:18px;background:var(--pine-tint);border:1px solid #cfe4da;border-radius:12px;padding:18px 20px}
.result .big{font-size:2rem;font-weight:800;color:var(--pine-dark);line-height:1.1}
.result .sub{color:var(--slate);font-size:.95rem;margin-top:4px}
.result .mini{display:flex;gap:22px;flex-wrap:wrap;margin-top:12px}
.result .mini div{font-size:.9rem;color:var(--slate-2)}
.result .mini b{display:block;font-size:1.15rem;color:var(--slate);font-weight:700}
.result .note{margin-top:12px;font-size:.9rem;color:var(--slate)}
.reslinks{display:flex;gap:16px;margin-top:12px}
.reslinks button{background:none;border:0;color:var(--pine);font-weight:600;cursor:pointer;font-size:.9rem;padding:0}
.formula{background:#fff;border:1px solid var(--border);border-left:4px solid var(--sand);border-radius:8px;padding:14px 18px;font-size:1.05rem;margin:1em 0}
.related{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin:1em 0}
.related a{display:block;background:#fff;border:1px solid var(--border);border-radius:10px;padding:14px 16px;font-weight:600;color:var(--slate)}
.related a:hover{border-color:var(--pine);text-decoration:none}
.meta{margin-top:2.4em;padding-top:16px;border-top:1px solid var(--border);font-size:.88rem;color:var(--slate-2)}

@media(max-width:760px){
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;
    gap:0;border-bottom:1px solid var(--border);padding:6px 20px;box-shadow:var(--shadow)}
  .row2{grid-template-columns:1fr}
  .nav a{padding:12px 0;border-bottom:1px solid var(--border)}
  .nt:checked ~ .nav{display:flex}
  .search{display:none}
  .hamb{display:block;margin-left:auto}
  .hero h1{font-size:1.9rem}
  h1{font-size:1.6rem}
  .fcols{grid-template-columns:1fr 1fr}
}