/* ===== Design tokens ===== */
:root{
  --bg:#F1F3EB;
  --bg-elevated:#FFFFFF;
  --ink:#16241B;
  --ink-soft:#4C5C50;
  --line:#D6DECA;
  --forest:#2E5E45;
  --forest-dark:#1F4632;
  --lichen:#8FAE55;
  --ember:#D97A34;
  --sky:#3E7C9E;
  --danger:#B5432E;
  --radius:14px;
  --radius-sm:8px;
  --shadow:0 8px 30px rgba(22,36,27,0.08);
  --font-display:'Outfit',sans-serif;
  --font-body:'Inter',sans-serif;
  --header-h:72px;
}
[data-theme="dark"]{
  --bg:#0F1A14;
  --bg-elevated:#16231C;
  --ink:#EDF2E8;
  --ink-soft:#A9B8AC;
  --line:#26362C;
  --forest:#5FA37B;
  --forest-dark:#3E7C59;
  --lichen:#9CC26A;
  --ember:#E39A5C;
  --sky:#6FB2D6;
  --shadow:0 8px 30px rgba(0,0,0,0.35);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  transition:background .25s ease,color .25s ease;
}
h1,h2,h3{font-family:var(--font-display);color:var(--ink);margin:0 0 .5em;line-height:1.15;}
p{margin:0 0 1em;color:var(--ink-soft);}
a{color:var(--forest);text-decoration:none;}
a:hover{text-decoration:underline;}
img{max-width:100%;display:block;}
button{font-family:inherit;}
:focus-visible{outline:3px solid var(--ember);outline-offset:2px;}
.skip-link{position:absolute;left:-999px;top:0;background:var(--forest);color:#fff;padding:.75em 1em;z-index:200;border-radius:0 0 8px 0;}
.skip-link:focus{left:0;}

.section-inner{max-width:1180px;margin:0 auto;padding:0 24px;}
.section-inner.narrow{max-width:760px;}
.eyebrow{font-family:var(--font-display);font-weight:600;letter-spacing:.08em;text-transform:uppercase;font-size:.8rem;color:var(--forest);margin-bottom:.5em;}
.eyebrow.center{text-align:center;}
.section-heading{font-size:clamp(1.6rem,3vw,2.4rem);text-align:center;max-width:700px;margin:0 auto .6em;}
.section-heading-sm{font-size:clamp(1.2rem,2.2vw,1.6rem);margin-bottom:.6em;}
.section-sub{text-align:center;color:var(--ink-soft);max-width:560px;margin:-0.4em auto 2em;}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;padding:.85em 1.6em;border-radius:999px;font-weight:600;font-size:.95rem;border:1px solid transparent;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease,background .2s ease;white-space:nowrap;}
.btn:hover{transform:translateY(-2px);}
.btn-primary{background:var(--forest);color:#fff;}
.btn-primary:hover{background:var(--forest-dark);text-decoration:none;}
.btn-large{padding:1em 2em;font-size:1.05rem;}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line);}
.btn-ghost:hover{background:var(--bg-elevated);text-decoration:none;}
.btn-secondary{background:var(--bg-elevated);color:var(--ink);border:1px solid var(--line);}
.btn-secondary:hover{border-color:var(--forest);text-decoration:none;}
.btn-outline-light{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.6);}
.btn-outline-light:hover{background:rgba(255,255,255,.12);text-decoration:none;}
.btn-sm{padding:.55em 1.2em;font-size:.85rem;}
.btn:disabled{opacity:.6;cursor:not-allowed;transform:none;}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:100;background:var(--bg-elevated);border-bottom:1px solid var(--line);height:var(--header-h);}
.header-inner{max-width:1180px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;}
.logo{display:flex;align-items:center;gap:.5em;font-family:var(--font-display);font-weight:700;font-size:1.15rem;color:var(--ink);}
.logo:hover{text-decoration:none;}
.logo-mark{font-size:1.4rem;}
.main-nav ul{list-style:none;display:flex;gap:6px;margin:0;padding:0;align-items:center;}
.main-nav a,.mega-trigger{color:var(--ink);font-weight:500;padding:.6em .8em;border-radius:var(--radius-sm);display:flex;align-items:center;gap:.35em;background:none;border:none;cursor:pointer;font-size:.95rem;}
.main-nav a:hover,.mega-trigger:hover{background:var(--bg);text-decoration:none;}
.has-mega{position:relative;}
.mega-panel{position:absolute;top:100%;left:0;display:none;grid-template-columns:repeat(3,180px);gap:8px;background:var(--bg-elevated);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-top:8px;}
.has-mega.open .mega-panel{display:grid;}
.mega-col{display:flex;flex-direction:column;gap:2px;}
.mega-col a{padding:.5em .6em;font-size:.88rem;border-radius:6px;}
.mega-col a.active{color:var(--forest);font-weight:700;background:var(--bg);}
.header-actions{display:flex;align-items:center;gap:8px;}
.icon-btn{background:none;border:1px solid var(--line);width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--ink);cursor:pointer;}
.icon-btn:hover{background:var(--bg);}
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;background:none;border:1px solid var(--line);border-radius:8px;cursor:pointer;}
.nav-toggle span{display:block;height:2px;background:var(--ink);width:20px;margin:0 auto;}

/* ===== Breadcrumb ===== */
.breadcrumb{background:var(--bg);border-bottom:1px solid var(--line);}
.breadcrumb-inner{max-width:1180px;margin:0 auto;padding:10px 24px;}
.breadcrumb ol{display:flex;flex-wrap:wrap;list-style:none;margin:0;padding:0;gap:6px;font-size:.85rem;color:var(--ink-soft);}
.breadcrumb li:not(:last-child)::after{content:"›";margin-left:6px;color:var(--ink-soft);}
.breadcrumb a{color:var(--ink-soft);}
.breadcrumb li[aria-current]{color:var(--ink);font-weight:600;}

/* ===== Hero ===== */
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,var(--forest-dark) 0%,var(--forest) 100%);color:#fff;padding:72px 24px 96px;}
.hero-inner{max-width:760px;margin:0 auto;position:relative;z-index:2;text-align:center;}
.hero .eyebrow{color:var(--lichen);}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);color:#fff;}
.hero-sub{color:rgba(255,255,255,.85);max-width:600px;margin:0 auto 1.5em;font-size:1.05rem;}
.hero-stats{display:flex;flex-wrap:wrap;justify-content:center;gap:28px;margin:2em 0;}
.stat{display:flex;flex-direction:column;}
.stat-num{font-family:var(--font-display);font-size:1.7rem;font-weight:700;color:var(--lichen);}
.stat-label{font-size:.78rem;color:rgba(255,255,255,.75);max-width:150px;}
.hero-graphic{position:absolute;inset:0;pointer-events:none;z-index:1;}
.ring{position:absolute;border-radius:50%;border:1px solid rgba(255,255,255,.12);}
.ring-1{width:600px;height:600px;top:-200px;right:-200px;}
.ring-2{width:420px;height:420px;top:-100px;right:-100px;}
.ring-3{width:900px;height:900px;bottom:-500px;left:-300px;border-color:rgba(255,255,255,.08);}

/* ===== Related tools ===== */
.related-tools{padding:48px 0;border-bottom:1px solid var(--line);}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:8px;}
.related-grid a{font-size:.85rem;padding:.6em .8em;border:1px solid var(--line);border-radius:var(--radius-sm);color:var(--ink-soft);background:var(--bg-elevated);}
.related-grid a:hover{border-color:var(--forest);color:var(--forest);text-decoration:none;}

/* ===== Features ===== */
.features{padding:80px 0;}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:2.5em;}
.feature-card{background:var(--bg-elevated);border:1px solid var(--line);border-radius:var(--radius);padding:28px;}
.feature-icon{font-size:1.8rem;margin-bottom:.5em;}
.feature-card h3{font-size:1.05rem;margin-bottom:.4em;}
.feature-card p{font-size:.9rem;margin:0;}

/* ===== How it works ===== */
.how-it-works{padding:80px 0;background:var(--bg-elevated);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:2.5em;}
.step{text-align:center;padding:0 8px;}
.step-num{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;background:var(--forest);color:#fff;font-family:var(--font-display);font-weight:700;margin-bottom:.7em;}
.step h3{font-size:1rem;}
.step p{font-size:.88rem;}

/* ===== Calculator form ===== */
.calculator{padding:80px 0;}
.calc-form{max-width:760px;margin:0 auto;background:var(--bg-elevated);border:1px solid var(--line);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow);}
fieldset{border:none;padding:0;margin:0 0 28px;}
legend{font-family:var(--font-display);font-weight:700;font-size:1.05rem;margin-bottom:1em;padding:0;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px;}
.field{display:flex;flex-direction:column;gap:6px;}
.field label{font-size:.86rem;font-weight:600;color:var(--ink-soft);}
.field input,.field select{padding:.75em .9em;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--bg);color:var(--ink);font-size:.95rem;font-family:inherit;width:100%;}
.field input:focus,.field select:focus{border-color:var(--forest);}
.field input.invalid{border-color:var(--danger);}
.field-error{font-size:.78rem;color:var(--danger);min-height:1em;}
.checkbox-field{flex-direction:row;align-items:center;}
.checkbox-label{display:flex;align-items:center;gap:.5em;font-weight:500;color:var(--ink);}
.checkbox-label input{width:auto;}
.form-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:8px;}
.form-privacy{font-size:.8rem;color:var(--ink-soft);margin-top:14px;margin-bottom:0;}

/* ===== Results ===== */
.results{padding:80px 0;background:var(--bg-elevated);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.results-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:24px;max-width:980px;margin:2em auto 0;}
.result-total-card,.result-breakdown-card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:28px;}
.result-label{font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-soft);font-weight:600;margin-bottom:.3em;}
.result-total{font-family:var(--font-display);font-size:2.6rem;font-weight:700;color:var(--forest);margin:0;}
.result-unit{color:var(--ink-soft);font-size:.9rem;margin-bottom:1em;}
.result-compare{font-weight:600;margin-bottom:1.2em;}
.result-bar-track{position:relative;height:10px;background:var(--line);border-radius:6px;margin-top:1em;}
.result-bar-fill{height:100%;background:var(--forest);border-radius:6px;width:0%;transition:width .6s ease;}
.result-bar-marker{position:absolute;top:-4px;width:2px;height:18px;background:var(--ink-soft);}
.result-bar-marker.target{background:var(--ember);}
.result-bar-legend{display:flex;justify-content:space-between;font-size:.72rem;color:var(--ink-soft);margin-top:.4em;}
.result-breakdown-card{text-align:center;}
.result-breakdown-card canvas{margin:0 auto;max-width:100%;height:auto;}
.breakdown-legend{list-style:none;margin:1em 0 0;padding:0;text-align:left;display:grid;grid-template-columns:1fr 1fr;gap:6px;font-size:.85rem;}
.breakdown-legend li{display:flex;align-items:center;gap:.5em;}
.legend-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0;}
.result-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:2em;}
.copy-confirm{text-align:center;color:var(--forest);font-size:.85rem;font-weight:600;min-height:1.2em;margin-top:.8em;}

/* ===== FAQ ===== */
.faq{padding:80px 0;}
.faq-list{max-width:760px;margin:2em auto 0;display:flex;flex-direction:column;gap:10px;}
.faq-item{background:var(--bg-elevated);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px 20px;}
.faq-item summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:1.2rem;color:var(--forest);}
.faq-item[open] summary::after{content:"−";}
.faq-item p{margin-top:10px;margin-bottom:0;}

/* ===== Article ===== */
.article{padding:60px 0 80px;}
.article p{font-size:.98rem;}

/* ===== CTA ===== */
.cta{background:linear-gradient(135deg,var(--forest-dark),var(--sky));padding:64px 24px;color:#fff;}
.cta-inner{text-align:center;}
.cta h2{color:#fff;font-size:clamp(1.4rem,3vw,2rem);}
.cta p{color:rgba(255,255,255,.85);}
.cta-buttons{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:1.5em;}

/* ===== Footer ===== */
.site-footer{background:var(--forest-dark);color:rgba(255,255,255,.85);padding:56px 24px 24px;}
.footer-inner{max-width:1180px;margin:0 auto;}
.footer-top{display:grid;grid-template-columns:1.3fr repeat(4,1fr);gap:24px;}
.footer-brand p{color:rgba(255,255,255,.65);font-size:.85rem;}
.site-footer .logo{color:#fff;}
.footer-col h3{color:#fff;font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;margin-bottom:.8em;}
.footer-col{display:flex;flex-direction:column;gap:6px;}
.footer-col a{color:rgba(255,255,255,.7);font-size:.85rem;}
.footer-col a:hover{color:#fff;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.15);margin-top:40px;padding-top:20px;font-size:.78rem;color:rgba(255,255,255,.55);}
.footer-bottom p{color:inherit;margin-bottom:.5em;}

/* ===== Cookie banner ===== */
.cookie-banner{position:fixed;left:16px;right:16px;bottom:16px;max-width:520px;margin:0 auto;background:var(--bg-elevated);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow);z-index:300;}
.cookie-banner p{font-size:.85rem;margin-bottom:.8em;}
.cookie-actions{display:flex;gap:10px;}

/* ===== Back to top ===== */
.back-to-top{position:fixed;right:20px;bottom:20px;width:44px;height:44px;border-radius:50%;background:var(--forest);color:#fff;border:none;font-size:1.2rem;cursor:pointer;z-index:150;box-shadow:var(--shadow);}

/* ===== Responsive ===== */
@media (max-width:900px){
  .feature-grid{grid-template-columns:repeat(2,1fr);}
  .steps{grid-template-columns:repeat(2,1fr);}
  .results-grid{grid-template-columns:1fr;}
  .footer-top{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:720px){
  .nav-toggle{display:flex;}
  .main-nav{position:fixed;top:var(--header-h);left:0;right:0;bottom:0;background:var(--bg-elevated);transform:translateX(100%);transition:transform .25s ease;overflow-y:auto;padding:16px;z-index:99;}
  .main-nav.open{transform:translateX(0);}
  .main-nav ul{flex-direction:column;align-items:stretch;gap:2px;}
  .mega-panel{position:static;display:none;grid-template-columns:1fr;box-shadow:none;margin-top:4px;}
  .has-mega.open .mega-panel{display:grid;}
  .form-row{grid-template-columns:1fr;}
  .feature-grid{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr;}
  .footer-top{grid-template-columns:1fr 1fr;}
  .hero{padding:56px 20px 72px;}
}
@media (max-width:480px){
  .footer-top{grid-template-columns:1fr;}
  .hero-stats{gap:18px;}
  .cta-buttons .btn{width:100%;}
}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:0.001ms !important;animation-iteration-count:1 !important;transition-duration:0.001ms !important;scroll-behavior:auto !important;}
}