@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:opsz,wght@9..40,300;9..40,400;9..40,500&display=swap');

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

:root{
  --bg:#F7F6F2;
  --surface:#FFFFFF;
  --border:#E5E3DC;
  --text:#1A1A18;
  --muted:#6B6B65;
  --accent:#1B6B4A;
  --accent-light:#EAF4EE;
  --accent-mid:#2D9966;
  --blue:#185FA5;
  --blue-light:#E6F1FB;
  --amber:#B7791F;
  --amber-light:#FEF5E4;
  --red:#C0392B;
  --red-light:#FDECEA;
  --purple:#534AB7;
  --purple-light:#EEEDFE;
  --radius:14px;
  --radius-sm:8px;
  --shadow:0 1px 3px rgba(0,0,0,0.06),0 4px 16px rgba(0,0,0,0.04);
  --t:0.18s cubic-bezier(0.4,0,0.2,1);
}

html{scroll-behavior:smooth}
body{font-family:'DM Sans',sans-serif;background:var(--bg);color:var(--text);font-size:15px;line-height:1.6;min-height:100vh}

/* NAV */
nav{position:sticky;top:0;z-index:100;background:rgba(247,246,242,0.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);padding:0 2rem;display:flex;align-items:center;justify-content:space-between;height:60px;gap:1rem}
.logo{font-family:'DM Serif Display',serif;font-size:1.2rem;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:8px;flex-shrink:0}
.logo-dot{width:8px;height:8px;border-radius:50%;background:var(--accent-mid);display:inline-block}
.nav-links{display:flex;gap:0;list-style:none;flex-wrap:nowrap;overflow-x:auto}
.nav-links a{color:var(--muted);text-decoration:none;font-size:0.8rem;font-weight:500;transition:color var(--t);padding:0 0.75rem;white-space:nowrap}
.nav-links a:hover,.nav-links a.active{color:var(--text)}
.nav-count{background:var(--accent-light);color:var(--accent);font-size:0.72rem;font-weight:500;padding:3px 10px;border-radius:99px;flex-shrink:0}

/* BREADCRUMB */
.breadcrumb{max-width:900px;margin:1.5rem auto 0;padding:0 2rem;font-size:0.8rem;color:var(--muted)}
.breadcrumb a{color:var(--muted);text-decoration:none}
.breadcrumb a:hover{color:var(--text)}
.breadcrumb span{margin:0 6px}

/* HERO — homepage */
.hero{max-width:860px;margin:0 auto;padding:4rem 2rem 2.5rem;text-align:center}
.hero-tag{display:inline-block;background:var(--accent-light);color:var(--accent);font-size:0.72rem;font-weight:500;letter-spacing:0.07em;text-transform:uppercase;padding:5px 14px;border-radius:99px;margin-bottom:1.25rem}
.hero h1{font-family:'DM Serif Display',serif;font-size:clamp(2rem,5vw,3.2rem);line-height:1.15;letter-spacing:-0.02em;margin-bottom:0.875rem}
.hero h1 em{font-style:italic;color:var(--accent-mid)}
.hero p{color:var(--muted);font-size:0.95rem;font-weight:300;max-width:460px;margin:0 auto 2rem;line-height:1.75}
.hero-stats{display:flex;justify-content:center;gap:2.5rem}
.hero-stat-num{font-family:'DM Serif Display',serif;font-size:1.6rem;color:var(--text);display:block}
.hero-stat-label{font-size:0.78rem;color:var(--muted);font-weight:300}

/* SEARCH */
.search-wrap{max-width:520px;margin:0 auto 2.5rem;padding:0 2rem}
.search-box{display:flex;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:99px;padding:0 1.25rem;box-shadow:var(--shadow);transition:border-color var(--t)}
.search-box:focus-within{border-color:var(--accent-mid)}
.search-box input{flex:1;border:none;outline:none;background:transparent;font-family:'DM Sans',sans-serif;font-size:0.875rem;color:var(--text);padding:0.8rem 0}
.search-box input::placeholder{color:var(--muted)}

/* CATEGORY TABS */
.cat-tabs{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;max-width:900px;margin:0 auto 2.5rem;padding:0 2rem}
.cat-tab{padding:5px 14px;border-radius:99px;border:1px solid var(--border);background:var(--surface);font-size:0.78rem;font-weight:500;color:var(--muted);cursor:pointer;transition:all var(--t);font-family:'DM Sans',sans-serif}
.cat-tab:hover{border-color:var(--accent-mid);color:var(--accent)}
.cat-tab.active{background:var(--accent);border-color:var(--accent);color:#fff}

/* CARD GRID */
.calc-grid{max-width:1080px;margin:0 auto;padding:0 2rem 4rem;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.calc-card-link{text-decoration:none;color:inherit;display:block}
.calc-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;box-shadow:var(--shadow);transition:transform var(--t),box-shadow var(--t);height:100%;display:flex;flex-direction:column}
.calc-card:hover{transform:translateY(-2px);box-shadow:0 4px 24px rgba(0,0,0,0.09)}
.calc-card-top{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:0.75rem}
.calc-icon{width:38px;height:38px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:1rem;flex-shrink:0}
.badge{font-size:0.68rem;font-weight:500;padding:3px 9px;border-radius:99px;text-transform:uppercase;letter-spacing:0.04em}
.badge-nursing{background:var(--accent-light);color:var(--accent)}
.badge-converter{background:var(--blue-light);color:var(--blue)}
.badge-vitals{background:var(--amber-light);color:var(--amber)}
.badge-renal{background:var(--red-light);color:var(--red)}
.badge-pediatric{background:var(--purple-light);color:var(--purple)}
.calc-card h3{font-family:'DM Serif Display',serif;font-size:1rem;line-height:1.3;margin-bottom:0.3rem}
.calc-card p{font-size:0.78rem;color:var(--muted);font-weight:300;line-height:1.5;flex:1}
.calc-card-arrow{margin-top:1rem;font-size:0.78rem;color:var(--accent);font-weight:500;display:flex;align-items:center;gap:4px}

/* CALCULATOR PAGE */
.calc-page{max-width:720px;margin:0 auto;padding:2rem 2rem 4rem}
.calc-page-header{margin-bottom:2rem}
.calc-page-tag{display:inline-block;font-size:0.7rem;font-weight:500;padding:3px 10px;border-radius:99px;text-transform:uppercase;letter-spacing:0.05em;margin-bottom:0.75rem}
.calc-page h1{font-family:'DM Serif Display',serif;font-size:clamp(1.6rem,4vw,2.2rem);line-height:1.2;letter-spacing:-0.01em;margin-bottom:0.5rem}
.calc-page-desc{color:var(--muted);font-size:0.9rem;font-weight:300;line-height:1.7;max-width:560px}

/* CALCULATOR BOX */
.calc-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:2rem;box-shadow:var(--shadow);margin-bottom:1.5rem}
.field{margin-bottom:1rem}
.field label{display:block;font-size:0.72rem;font-weight:500;color:var(--muted);margin-bottom:5px;text-transform:uppercase;letter-spacing:0.05em}
.field-row{display:flex;gap:8px}
.field-row .field{flex:1}
input[type="number"],input[type="date"],select,input[type="text"]{width:100%;padding:0.65rem 0.9rem;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:'DM Sans',sans-serif;font-size:0.875rem;color:var(--text);background:var(--bg);outline:none;transition:border-color var(--t),-moz-appearance:textfield}
input[type="number"]::-webkit-inner-spin-button{-webkit-appearance:none}
input[type="number"]:focus,select:focus,input[type="date"]:focus,input[type="text"]:focus{border-color:var(--accent-mid);background:#fff}
select{cursor:pointer}
.calc-btn{width:100%;padding:0.75rem;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);font-family:'DM Sans',sans-serif;font-size:0.875rem;font-weight:500;cursor:pointer;transition:background var(--t),transform var(--t);margin-top:0.25rem}
.calc-btn:hover{background:var(--accent-mid)}
.calc-btn:active{transform:scale(0.98)}
.calc-btn-secondary{background:transparent;color:var(--muted);border:1px solid var(--border);margin-top:8px;font-size:0.8rem}
.calc-btn-secondary:hover{background:var(--bg);color:var(--text)}

/* RESULT */
.result-box{border-radius:var(--radius-sm);padding:1.25rem 1.5rem;display:none;animation:fadeUp 0.2s ease;margin-top:1rem}
.result-box.show{display:block}
.result-box.success{background:var(--accent-light);border:1px solid #B6DECA}
.result-box.warn{background:var(--amber-light);border:1px solid #F5D28A}
.result-box.danger{background:var(--red-light);border:1px solid #F0B8B3}
.result-box.info{background:var(--blue-light);border:1px solid #B5D4F4}
.result-label{font-size:0.7rem;font-weight:500;text-transform:uppercase;letter-spacing:0.06em;color:var(--muted);margin-bottom:3px}
.result-value{font-family:'DM Serif Display',serif;font-size:2rem;color:var(--text);line-height:1.15}
.result-sub{font-size:0.78rem;color:var(--muted);margin-top:6px;font-weight:300;line-height:1.5}

/* INFO SECTIONS */
.info-section{margin-top:2rem}
.info-section h2{font-family:'DM Serif Display',serif;font-size:1.2rem;margin-bottom:0.75rem}
.info-section p{font-size:0.875rem;color:var(--muted);line-height:1.75;margin-bottom:0.75rem}
.formula-box{background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--accent-mid);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:1rem 1.25rem;font-family:monospace;font-size:0.85rem;color:var(--text);margin:1rem 0}
.ref-table{width:100%;border-collapse:collapse;font-size:0.82rem;margin:1rem 0}
.ref-table th{background:var(--bg);padding:8px 12px;text-align:left;font-weight:500;border-bottom:1px solid var(--border);color:var(--muted);font-size:0.72rem;text-transform:uppercase;letter-spacing:0.04em}
.ref-table td{padding:8px 12px;border-bottom:1px solid var(--border);color:var(--text)}
.ref-table tr:last-child td{border-bottom:none}
.ref-table tr:hover td{background:var(--bg)}

/* DISCLAIMER */
.disclaimer-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:1rem 1.25rem;font-size:0.78rem;color:var(--muted);line-height:1.6;margin-top:1.5rem}

/* FOOTER */
footer{border-top:1px solid var(--border);padding:2rem;text-align:center;font-size:0.78rem;color:var(--muted)}
footer strong{color:var(--text)}
footer a{color:var(--muted);text-decoration:none}
footer a:hover{color:var(--text)}

/* RELATED */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px;margin-top:1rem}
.related-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:0.875rem 1rem;text-decoration:none;color:var(--text);display:flex;align-items:center;gap:10px;transition:all var(--t);font-size:0.82rem;font-weight:500}
.related-card:hover{border-color:var(--accent-mid);transform:translateY(-1px)}
.related-card span{font-size:1.1rem}

@keyframes fadeUp{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}

/* UTILS */
.hidden{display:none!important}
.divider{height:1px;background:var(--border);margin:1.5rem 0}

/* ── ENHANCED UI (synced from preview) ── */
.hero-trust{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin-bottom:2rem}
.hero-trust-pill{display:flex;align-items:center;gap:6px;background:var(--surface);border:1px solid var(--border);border-radius:99px;padding:5px 14px;font-size:.78rem;color:var(--muted);font-weight:400}
.hero-trust-pill .pill-dot{width:6px;height:6px;border-radius:50%;background:var(--accent-mid);flex-shrink:0}
.hero-stats{display:flex;justify-content:center;gap:0;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);overflow:hidden;max-width:480px;margin:0 auto}
.hero-stat{flex:1;padding:1rem 0.5rem;text-align:center;border-right:1px solid var(--border)}
.hero-stat:last-child{border-right:none}
.hero-stat-num{font-family:'DM Serif Display',serif;font-size:1.5rem;color:var(--text);display:block;line-height:1}
.hero-stat-label{font-size:.72rem;color:var(--muted);font-weight:300;margin-top:4px;display:block}

/* TOP PICKS */
.top-picks{max-width:1060px;margin:0 auto;padding:2.5rem 1.5rem 0}
.top-picks-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}
.top-picks-label{font-family:'DM Serif Display',serif;font-size:1.1rem;color:var(--text)}
.top-picks-sub{font-size:.78rem;color:var(--muted);font-weight:300}
.picks-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.pick-card{background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);padding:1.1rem 1.1rem 1rem;cursor:pointer;display:flex;flex-direction:column;gap:0;transition:transform var(--t),box-shadow var(--t),border-color var(--t);position:relative;overflow:hidden}
.pick-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;border-radius:var(--radius) var(--radius) 0 0}
.pick-card.pc-green::before{background:var(--accent-mid)}
.pick-card.pc-blue::before{background:var(--blue)}
.pick-card.pc-amber::before{background:var(--amber)}
.pick-card.pc-red::before{background:var(--red)}
.pick-card:hover{transform:translateY(-3px);box-shadow:0 8px 28px rgba(0,0,0,.1);border-color:transparent}
.pick-card:hover.pc-green{border-color:var(--accent-mid)}
.pick-card:hover.pc-blue{border-color:var(--blue)}
.pick-card:hover.pc-amber{border-color:var(--amber)}
.pick-card:hover.pc-red{border-color:var(--red)}
.pick-icon-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:.65rem}
.pick-icon{font-size:1.3rem;line-height:1}
.pick-hot{font-size:.65rem;font-weight:500;padding:2px 7px;border-radius:99px;letter-spacing:.03em;text-transform:uppercase}
.pick-hot-green{background:var(--accent-light);color:var(--accent)}
.pick-hot-blue{background:var(--blue-light);color:var(--blue)}
.pick-hot-amber{background:var(--amber-light);color:var(--amber)}
.pick-hot-red{background:var(--red-light);color:var(--red)}
.pick-card h3{font-family:'DM Serif Display',serif;font-size:.95rem;line-height:1.25;margin-bottom:.3rem;color:var(--text)}
.pick-card p{font-size:.74rem;color:var(--muted);font-weight:300;line-height:1.5;flex:1}
.pick-cta{margin-top:.85rem;font-size:.75rem;font-weight:500;display:flex;align-items:center;gap:4px}
.pick-cta-green{color:var(--accent)}
.pick-cta-blue{color:var(--blue)}
.pick-cta-amber{color:var(--amber)}
.pick-cta-red{color:var(--red)}
.picks-divider{border:none;border-top:1px solid var(--border);margin:2.5rem 1.5rem 0;max-width:1060px;margin-left:auto;margin-right:auto}

.top-picks{max-width:1060px;margin:0 auto;padding:2.5rem 1.5rem 0}
.top-picks-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}
.top-picks-label{font-family:'DM Serif Display',serif;font-size:1.1rem;color:var(--text)}
.top-picks-sub{font-size:.78rem;color:var(--muted);font-weight:300}
.picks-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.pick-card{background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);padding:1.1rem 1.1rem 1rem;cursor:pointer;display:flex;flex-direction:column;gap:0;transition:transform var(--t),box-shadow var(--t),border-color var(--t);position:relative;overflow:hidden}
.pick-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;border-radius:var(--radius) var(--radius) 0 0}
.pick-card.pc-green::before{background:var(--accent-mid)}
.pick-card.pc-blue::before{background:var(--blue)}
.pick-card.pc-amber::before{background:var(--amber)}
.pick-card.pc-red::before{background:var(--red)}
.pick-card:hover{transform:translateY(-3px);box-shadow:0 8px 28px rgba(0,0,0,.1);border-color:transparent}
.pick-card:hover.pc-green{border-color:var(--accent-mid)}
.pick-card:hover.pc-blue{border-color:var(--blue)}
.pick-card:hover.pc-amber{border-color:var(--amber)}
.pick-card:hover.pc-red{border-color:var(--red)}
.pick-icon-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:.65rem}
.pick-icon{font-size:1.3rem;line-height:1}
.pick-hot{font-size:.65rem;font-weight:500;padding:2px 7px;border-radius:99px;letter-spacing:.03em;text-transform:uppercase}
.pick-hot-green{background:var(--accent-light);color:var(--accent)}
.pick-hot-blue{background:var(--blue-light);color:var(--blue)}
.pick-hot-amber{background:var(--amber-light);color:var(--amber)}
.pick-hot-red{background:var(--red-light);color:var(--red)}
.pick-card h3{font-family:'DM Serif Display',serif;font-size:.95rem;line-height:1.25;margin-bottom:.3rem;color:var(--text)}
.pick-card p{font-size:.74rem;color:var(--muted);font-weight:300;line-height:1.5;flex:1}
.pick-cta{margin-top:.85rem;font-size:.75rem;font-weight:500;display:flex;align-items:center;gap:4px}
.pick-cta-green{color:var(--accent)}
.pick-cta-blue{color:var(--blue)}
.pick-cta-amber{color:var(--amber)}
.pick-cta-red{color:var(--red)}
.picks-divider{border:none;border-top:1px solid var(--border);margin:2.5rem 1.5rem 0;max-width:1060px;margin-left:auto;margin-right:auto}

/* SEARCH */
.search-wrap{max-width:500px;margin:0 auto 2rem;padding:0 1.5rem}
.search-box{display:flex;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:99px;padding:0 1.25rem;box-shadow:var(--shadow);transition:border-color var(--t)}
.search-box:focus-within{border-color:var(--accent-mid)}
.search-box input{flex:1;border:none;outline:none;background:transparent;font-family:'DM Sans',sans-serif;font-size:.875rem;color:var(--text);padding:.75rem 0}
.search-box input::placeholder{color:var(--muted)}

/* CAT TABS */
.cat-tabs-wrap{max-width:1060px;margin:0 auto;padding:0 1.5rem 2rem}
.cat-tabs-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}
.cat-tabs-title{font-size:.72rem;font-weight:500;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
.cat-tabs-hint{font-size:.72rem;color:var(--muted);font-weight:300}
.cat-tabs{display:flex;gap:8px;flex-wrap:wrap}
.cat-tab{padding:8px 18px;border-radius:99px;border:1.5px solid var(--border);background:var(--surface);font-size:.85rem;font-weight:500;color:var(--muted);cursor:pointer;transition:all var(--t);font-family:'DM Sans',sans-serif;display:flex;align-items:center;gap:7px;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.cat-tab:hover{border-color:var(--accent-mid);color:var(--accent);background:#fff;box-shadow:0 2px 8px rgba(27,107,74,.1)}
.cat-tab.active{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 3px 12px rgba(27,107,74,.25)}
.cat-tab.active .tab-count{background:rgba(255,255,255,.25);color:#fff}
.tab-count{display:inline-flex;align-items:center;justify-content:center;background:var(--bg);color:var(--muted);font-size:.68rem;font-weight:500;min-width:18px;height:18px;border-radius:99px;padding:0 5px;transition:all var(--t)}

.cat-tabs-wrap{max-width:1060px;margin:0 auto;padding:0 1.5rem 2rem}
.cat-tabs-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}
.cat-tabs-title{font-size:.72rem;font-weight:500;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
.cat-tabs-hint{font-size:.72rem;color:var(--muted);font-weight:300}
.cat-tabs{display:flex;gap:8px;flex-wrap:wrap}
.cat-tab{padding:8px 18px;border-radius:99px;border:1.5px solid var(--border);background:var(--surface);font-size:.85rem;font-weight:500;color:var(--muted);cursor:pointer;transition:all var(--t);font-family:'DM Sans',sans-serif;display:flex;align-items:center;gap:7px;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.cat-tab:hover{border-color:var(--accent-mid);color:var(--accent);background:#fff;box-shadow:0 2px 8px rgba(27,107,74,.1)}
.cat-tab.active{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 3px 12px rgba(27,107,74,.25)}
.cat-tab.active .tab-count{background:rgba(255,255,255,.25);color:#fff}
.tab-count{display:inline-flex;align-items:center;justify-content:center;background:var(--bg);color:var(--muted);font-size:.68rem;font-weight:500;min-width:18px;height:18px;border-radius:99px;padding:0 5px;transition:all var(--t)}

/* CARD GRID */
.calc-grid{max-width:1060px;margin:0 auto;padding:0 1.5rem 3.5rem;display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:14px}
.calc-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.2rem;box-shadow:var(--shadow);transition:transform var(--t),box-shadow var(--t);cursor:pointer;display:flex;flex-direction:column;position:relative}
.calc-card:hover{transform:translateY(-2px);box-shadow:0 4px 24px rgba(0,0,0,.09)}
.card-top{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:.7rem}
.calc-icon{width:36px;height:36px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:1rem;flex-shrink:0}
.badge{font-size:.68rem;font-weight:500;padding:3px 9px;border-radius:99px;text-transform:uppercase;letter-spacing:.04em}
.bn{background:var(--accent-light);color:var(--accent)}
.bc{background:var(--blue-light);color:var(--blue)}
.bv{background:var(--amber-light);color:var(--amber)}
.br{background:var(--red-light);color:var(--red)}
.bp{background:var(--purple-light);color:var(--purple)}
.calc-card h3{font-family:'DM Serif Display',serif;font-size:.98rem;line-height:1.3;margin-bottom:.3rem}
.calc-card p{font-size:.77rem;color:var(--muted);font-weight:300;line-height:1.5;flex:1}
.card-arrow{margin-top:.9rem;font-size:.77rem;color:var(--accent);font-weight:500}

/* ── RESPONSIVE — TABLET (≤768px) ── */
@media(max-width:768px){
  /* Nav — hide text links, keep logo + badge only */
  .nav-links{display:none}
  nav{padding:0 1rem}
  .nav-count{font-size:.7rem;padding:3px 9px}

  /* Hero — tighter padding */
  .hero{padding:2rem 1.25rem 1.5rem}
  .hero h1{font-size:clamp(1.65rem,6vw,2.4rem)}
  .hero p{font-size:.88rem;max-width:100%}

  /* Trust pills — smaller */
  .hero-trust-pill{font-size:.72rem;padding:4px 11px}

  /* Top picks — horizontal scroll on tablet */
  .picks-grid{grid-template-columns:repeat(2,1fr)}

  /* Cat tabs — wrap on tablet, smaller padding */
  .cat-tabs{flex-wrap:wrap;overflow-x:unset;gap:7px}
  .cat-tab{flex-shrink:0;padding:7px 14px;font-size:.8rem}
  .cat-tabs-wrap{padding:0 1.25rem 1.75rem}

  /* Card grid — 2 cols on tablet */
  .calc-grid{grid-template-columns:repeat(2,1fr);padding:0 1.25rem 3rem;gap:12px}

  /* Calc page */
  .calc-page{padding:1.25rem 1.25rem 3rem}
  .calc-box{padding:1.35rem}
}

/* ── RESPONSIVE — MOBILE (≤480px) ── */
@media(max-width:480px){
  /* Nav — ultra compact */
  nav{height:52px;padding:0 1rem}
  .logo{font-size:1.05rem}
  .nav-count{display:none}

  /* Hero — compact */
  .hero{padding:1.5rem 1rem 1.25rem}
  .hero-tag{font-size:.65rem;padding:4px 11px;margin-bottom:1rem}
  .hero h1{font-size:1.6rem;line-height:1.2}
  .hero p{font-size:.84rem;margin-bottom:1.25rem}

  /* Trust pills — 2 per row on very small screens */
  .hero-trust{gap:6px}
  .hero-trust-pill{font-size:.7rem;padding:4px 10px;gap:5px}

  /* Stats — 2×2 grid */
  .hero-stats{display:grid;grid-template-columns:1fr 1fr;max-width:100%}
  .hero-stat{border-right:1px solid var(--border);border-bottom:1px solid var(--border);padding:.85rem .5rem}
  .hero-stat:nth-child(2){border-right:none}
  .hero-stat:nth-child(3){border-bottom:none}
  .hero-stat:nth-child(4){border-right:none;border-bottom:none}
  .hero-stat-num{font-size:1.3rem}
  .hero-stat-label{font-size:.68rem}

  /* Top picks — single column on small phones */
  .top-picks{padding:1.75rem 1rem 0}
  .picks-grid{grid-template-columns:1fr 1fr}
  .pick-card{padding:.9rem .9rem .85rem}
  .pick-card h3{font-size:.88rem}
  .pick-card p{display:none}/* hide desc on tiny screens to keep cards compact */
  .picks-divider{margin:1.75rem 1rem 0}

  /* Search */
  .search-wrap{padding:0 1rem;margin-bottom:1.5rem}
  .search-wrap[style]{margin-top:1.75rem!important}

  /* Cat tabs — wrap, compact on small phones */
  .cat-tabs-wrap{padding:0 1rem 1.5rem}
  .cat-tabs-header{margin-bottom:.75rem}
  .cat-tabs{flex-wrap:wrap;gap:6px}
  .cat-tab{padding:6px 11px;font-size:.75rem}

  /* Card grid — single column */
  .calc-grid{grid-template-columns:1fr;padding:0 1rem 2.5rem;gap:10px}
  .calc-card{padding:1rem}
  .calc-card h3{font-size:.92rem}

  /* Fav button repositioned */
  .fav-btn{top:.7rem;right:.7rem;font-size:1rem}

  /* Calc page fields */
  .calc-page{padding:1rem 1rem 2.5rem}
  .calc-box{padding:1.1rem}
  .field-row{flex-direction:column;gap:0}
  .field-row .field{margin-bottom:.6rem}
  .result-value{font-size:1.5rem}

  /* Bookmark banner */
  .bookmark-banner{bottom:1rem;max-width:calc(100% - 2rem)}
  .bb-sub{display:none}

  /* Post-result nudge */
  .result-nudge{flex-direction:column;align-items:flex-start;gap:8px}
  .nudge-btn{align-self:flex-end}

  /* Cheatsheet formula grid */
  .formula-grid{grid-template-columns:1fr}

  /* Related grid */
  .related-grid{grid-template-columns:1fr 1fr}
}

.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:500;display:none;align-items:center;justify-content:center;padding:1.5rem;animation:fadeIn .2s ease}
.modal-overlay.show{display:flex}
.modal{background:var(--surface);border-radius:var(--radius);max-width:580px;width:100%;box-shadow:0 24px 64px rgba(0,0,0,.2);overflow:hidden;animation:slideUp .25s ease}
@keyframes slideUp{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 1.5rem;border-bottom:1px solid var(--border)}
.modal-title{font-family:'DM Serif Display',serif;font-size:1.2rem}
.modal-close{background:none;border:none;cursor:pointer;font-size:1.2rem;color:var(--muted);padding:4px;border-radius:var(--radius-sm);transition:color var(--t)}
.modal-close:hover{color:var(--text)}
.modal-body{padding:1.5rem;overflow-y:auto;max-height:70vh}
.modal-body p{font-size:.85rem;color:var(--muted);line-height:1.75;margin-bottom:1rem}
.modal-body h3{font-family:'DM Serif Display',serif;font-size:1rem;margin:.75rem 0 .4rem}
.cite-row{display:flex;align-items:flex-start;gap:10px;padding:.6rem 0;border-bottom:.5px solid var(--border);font-size:.82rem}
.cite-row:last-child{border-bottom:none}
.cite-num{width:22px;height:22px;border-radius:50%;background:var(--accent-light);color:var(--accent);font-size:.7rem;font-weight:500;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}
.cite-detail{line-height:1.6}
.cite-detail strong{color:var(--text);font-weight:500;display:block;margin-bottom:2px}
.cite-detail span{color:var(--muted)}

.mobile-nav{display:none;position:fixed;bottom:0;left:0;right:0;z-index:300;background:rgba(247,246,242,.97);backdrop-filter:blur(12px);border-top:1px solid var(--border);padding:0;height:56px}
.mobile-nav-inner{display:flex;height:100%}
.mobile-nav-btn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;background:none;border:none;cursor:pointer;font-family:'DM Sans',sans-serif;color:var(--muted);transition:color var(--t);padding:0;font-size:.6rem;font-weight:500;text-transform:uppercase;letter-spacing:.04em}
.mobile-nav-btn:hover,.mobile-nav-btn.active{color:var(--accent)}
.mobile-nav-btn .mnb-icon{font-size:1.1rem;line-height:1}
@media(max-width:480px){
  .mobile-nav{display:block}
  /* push page content up so it isn't hidden behind bottom nav */
  body{padding-bottom:60px}
  /* push bookmark banner above bottom nav */
  .bookmark-banner{bottom:4.5rem}
}
.cheat-section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.35rem;margin-bottom:1.1rem}
.cheat-section h2{font-family:'DM Serif Display',serif;font-size:1.05rem;margin-bottom:.9rem;padding-bottom:.5rem;border-bottom:1px solid var(--border)}
.formula-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px}
.formula-item{background:var(--bg);border-radius:var(--radius-sm);padding:.7rem .9rem}
.formula-name{font-size:.68rem;font-weight:500;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:3px}
.formula-text{font-family:monospace;font-size:.79rem;color:var(--text);line-height:1.5}

/* FOOTER */
footer{border-top:1px solid var(--border);padding:1.75rem;text-align:center;font-size:.78rem;color:var(--muted)}
footer strong{color:var(--text)}
footer span{cursor:pointer;color:var(--muted)}
footer span:hover{color:var(--text)}

.divider{height:1px;background:var(--border);margin:1rem 0}
.hidden{display:none!important}
@media(max-width:600px){.formula-grid{grid-template-columns:1fr}.hero-stats{gap:1.5rem}.hero h1{font-size:1.75rem}}

/* ── RESPONSIVE — TABLET (≤768px) ── */
@media(max-width:768px){
  /* Nav — hide text links, keep logo + badge only */
  .nav-links{display:none}
  nav{padding:0 1rem}
  .nav-count{font-size:.7rem;padding:3px 9px}

  /* Hero — tighter padding */
  .hero{padding:2rem 1.25rem 1.5rem}
  .hero h1{font-size:clamp(1.65rem,6vw,2.4rem)}
  .hero p{font-size:.88rem;max-width:100%}

  /* Trust pills — smaller */
  .hero-trust-pill{font-size:.72rem;padding:4px 11px}

  /* Top picks — horizontal scroll on tablet */
  .picks-grid{grid-template-columns:repeat(2,1fr)}

  /* Cat tabs — wrap on tablet, smaller padding */
  .cat-tabs{flex-wrap:wrap;overflow-x:unset;gap:7px}
  .cat-tab{flex-shrink:0;padding:7px 14px;font-size:.8rem}
  .cat-tabs-wrap{padding:0 1.25rem 1.75rem}

  /* Card grid — 2 cols on tablet */
  .calc-grid{grid-template-columns:repeat(2,1fr);padding:0 1.25rem 3rem;gap:12px}

  /* Calc page */
  .calc-page{padding:1.25rem 1.25rem 3rem}
  .calc-box{padding:1.35rem}
}

/* ── RESPONSIVE — MOBILE (≤480px) ── */
@media(max-width:480px){
  /* Nav — ultra compact */
  nav{height:52px;padding:0 1rem}
  .logo{font-size:1.05rem}
  .nav-count{display:none}

  /* Hero — compact */
  .hero{padding:1.5rem 1rem 1.25rem}
  .hero-tag{font-size:.65rem;padding:4px 11px;margin-bottom:1rem}
  .hero h1{font-size:1.6rem;line-height:1.2}
  .hero p{font-size:.84rem;margin-bottom:1.25rem}

  /* Trust pills — 2 per row on very small screens */
  .hero-trust{gap:6px}
  .hero-trust-pill{font-size:.7rem;padding:4px 10px;gap:5px}

  /* Stats — 2×2 grid */
  .hero-stats{display:grid;grid-template-columns:1fr 1fr;max-width:100%}
  .hero-stat{border-right:1px solid var(--border);border-bottom:1px solid var(--border);padding:.85rem .5rem}
  .hero-stat:nth-child(2){border-right:none}
  .hero-stat:nth-child(3){border-bottom:none}
  .hero-stat:nth-child(4){border-right:none;border-bottom:none}
  .hero-stat-num{font-size:1.3rem}
  .hero-stat-label{font-size:.68rem}

  /* Top picks — single column on small phones */
  .top-picks{padding:1.75rem 1rem 0}
  .picks-grid{grid-template-columns:1fr 1fr}
  .pick-card{padding:.9rem .9rem .85rem}
  .pick-card h3{font-size:.88rem}
  .pick-card p{display:none}/* hide desc on tiny screens to keep cards compact */
  .picks-divider{margin:1.75rem 1rem 0}

  /* Search */
  .search-wrap{padding:0 1rem;margin-bottom:1.5rem}
  .search-wrap[style]{margin-top:1.75rem!important}

  /* Cat tabs — wrap, compact on small phones */
  .cat-tabs-wrap{padding:0 1rem 1.5rem}
  .cat-tabs-header{margin-bottom:.75rem}
  .cat-tabs{flex-wrap:wrap;gap:6px}
  .cat-tab{padding:6px 11px;font-size:.75rem}

  /* Card grid — single column */
  .calc-grid{grid-template-columns:1fr;padding:0 1rem 2.5rem;gap:10px}
  .calc-card{padding:1rem}
  .calc-card h3{font-size:.92rem}

  /* Fav button repositioned */
  .fav-btn{top:.7rem;right:.7rem;font-size:1rem}

  /* Calc page fields */
  .calc-page{padding:1rem 1rem 2.5rem}
  .calc-box{padding:1.1rem}
  .field-row{flex-direction:column;gap:0}
  .field-row .field{margin-bottom:.6rem}
  .result-value{font-size:1.5rem}

  /* Bookmark banner */
  .bookmark-banner{bottom:1rem;max-width:calc(100% - 2rem)}
  .bb-sub{display:none}

  /* Post-result nudge */
  .result-nudge{flex-direction:column;align-items:flex-start;gap:8px}
  .nudge-btn{align-self:flex-end}

  /* Cheatsheet formula grid */
  .formula-grid{grid-template-columns:1fr}

  /* Related grid */
  .related-grid{grid-template-columns:1fr 1fr}
}

/* CALC PAGE */
.calc-page{max-width:680px;margin:0 auto;padding:1.5rem 1.5rem 3.5rem}
.breadcrumb{font-size:.8rem;color:var(--muted);margin-bottom:1.25rem;display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.breadcrumb span{cursor:pointer;color:var(--muted)}
.breadcrumb span:hover{color:var(--text)}
.breadcrumb-sep{color:var(--border)}
.page-tag{display:inline-block;font-size:.7rem;font-weight:500;padding:3px 10px;border-radius:99px;text-transform:uppercase;letter-spacing:.05em;margin-bottom:.7rem}
.calc-page h1{font-family:'DM Serif Display',serif;font-size:clamp(1.5rem,4vw,2rem);line-height:1.2;letter-spacing:-.01em;margin-bottom:.5rem}
.page-desc{color:var(--muted);font-size:.88rem;font-weight:300;line-height:1.75;max-width:540px;margin-bottom:1.5rem}

/* CALC BOX */
.calc-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.75rem;box-shadow:var(--shadow);margin-bottom:1.5rem}
.field{margin-bottom:.85rem}
.field label{display:block;font-size:.72rem;font-weight:500;color:var(--muted);margin-bottom:5px;text-transform:uppercase;letter-spacing:.05em}
.field-row{display:flex;gap:8px}
.field-row .field{flex:1;margin-bottom:0}
input[type="number"],input[type="date"],select,input[type="text"]{width:100%;padding:.6rem .875rem;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:'DM Sans',sans-serif;font-size:.875rem;color:var(--text);background:var(--bg);outline:none;transition:border-color var(--t)}
input[type="number"]::-webkit-inner-spin-button{-webkit-appearance:none}
input[type="number"]:focus,select:focus,input[type="date"]:focus{border-color:var(--accent-mid);background:#fff}
select{cursor:pointer}
.calc-btn{width:100%;padding:.7rem;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);font-family:'DM Sans',sans-serif;font-size:.875rem;font-weight:500;cursor:pointer;transition:background var(--t),transform var(--t);margin-top:.2rem}
.calc-btn:hover{background:var(--accent-mid)}
.calc-btn:active{transform:scale(.98)}
.calc-btn-sec{background:transparent;color:var(--muted);border:1px solid var(--border);margin-top:7px;font-size:.8rem}
.calc-btn-sec:hover{background:var(--bg);color:var(--text)}

/* RESULT */
.result-box{border-radius:var(--radius-sm);padding:1.1rem 1.25rem;display:none;animation:fadeIn .2s ease;margin-top:.9rem}
.result-box.show{display:block}
.result-box.success{background:var(--accent-light);border:1px solid #B6DECA}
.result-box.warn{background:var(--amber-light);border:1px solid #F5D28A}
.result-box.danger{background:var(--red-light);border:1px solid #F0B8B3}
.result-box.info{background:var(--blue-light);border:1px solid #B5D4F4}
.result-label{font-size:.7rem;font-weight:500;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:3px}
.result-value{font-family:'DM Serif Display',serif;font-size:1.9rem;color:var(--text);line-height:1.15}
.result-sub{font-size:.77rem;color:var(--muted);margin-top:5px;font-weight:300;line-height:1.5}

/* INFO */
.info-section{margin-top:1.5rem}
.info-section h2{font-family:'DM Serif Display',serif;font-size:1.1rem;margin-bottom:.7rem}
.info-section p{font-size:.85rem;color:var(--muted);line-height:1.75;margin-bottom:.6rem}
.formula-box{background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--accent-mid);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:.9rem 1.1rem;font-family:monospace;font-size:.82rem;color:var(--text);margin:.85rem 0;line-height:1.6}
.ref-table{width:100%;border-collapse:collapse;font-size:.8rem;margin:.85rem 0}
.ref-table th{background:var(--bg);padding:7px 11px;text-align:left;font-weight:500;border-bottom:1px solid var(--border);color:var(--muted);font-size:.7rem;text-transform:uppercase;letter-spacing:.04em}
.ref-table td{padding:7px 11px;border-bottom:1px solid var(--border);color:var(--text)}
.ref-table tr:last-child td{border-bottom:none}
.ref-table tr:hover td{background:var(--bg)}

/* RELATED */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px;margin-top:.85rem}
.related-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.8rem 1rem;text-decoration:none;color:var(--text);display:flex;align-items:center;gap:9px;transition:all var(--t);font-size:.8rem;font-weight:500;cursor:pointer}
.related-card:hover{border-color:var(--accent-mid);transform:translateY(-1px)}

/* DISCLAIMER */
.disc-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.9rem 1.1rem;font-size:.77rem;color:var(--muted);line-height:1.6;margin-top:1.25rem}

/* ── RETENTION HOOKS ── */

/* Bookmark banner */
.bookmark-banner{position:fixed;bottom:1.5rem;left:50%;transform:translateX(-50%) translateY(120px);z-index:999;background:var(--text);color:#fff;border-radius:var(--radius);padding:1rem 1.25rem;display:flex;align-items:center;gap:12px;box-shadow:0 8px 32px rgba(0,0,0,.2);max-width:420px;width:calc(100% - 3rem);transition:transform .4s cubic-bezier(.34,1.56,.64,1);pointer-events:none;opacity:0}
.bookmark-banner.show{transform:translateX(-50%) translateY(0);pointer-events:all;opacity:1}
.bb-icon{font-size:1.4rem;flex-shrink:0}
.bb-text{flex:1}
.bb-title{font-size:.85rem;font-weight:500;margin-bottom:2px}
.bb-sub{font-size:.75rem;color:rgba(255,255,255,.65);line-height:1.4}
.bb-btn{background:var(--accent-mid);color:#fff;border:none;border-radius:var(--radius-sm);padding:7px 14px;font-family:'DM Sans',sans-serif;font-size:.78rem;font-weight:500;cursor:pointer;white-space:nowrap;transition:background var(--t)}
.bb-btn:hover{background:#24c47e}
.bb-close{background:none;border:none;color:rgba(255,255,255,.5);cursor:pointer;font-size:1.1rem;padding:0 4px;line-height:1;flex-shrink:0;transition:color var(--t)}
.bb-close:hover{color:#fff}

/* Heart / favourite button on calc cards */
.fav-btn{position:absolute;top:.85rem;right:.85rem;background:none;border:none;cursor:pointer;font-size:1.1rem;line-height:1;padding:4px;border-radius:50%;transition:transform .2s ease,background var(--t);z-index:2}
.fav-btn:hover{transform:scale(1.2);background:var(--bg)}
.fav-btn.active{animation:heartPop .3s ease}
@keyframes heartPop{0%{transform:scale(1)}50%{transform:scale(1.4)}100%{transform:scale(1)}}
.calc-card{position:relative}

/* Favourites tab strip addition */
.cat-tab.fav-tab{border-color:var(--red);color:var(--red)}
.cat-tab.fav-tab:hover{background:var(--red-light);border-color:var(--red)}
.cat-tab.fav-tab.active{background:var(--red);border-color:var(--red);color:#fff}
.cat-tab.fav-tab.active .tab-count{background:rgba(255,255,255,.25);color:#fff}

/* Empty favourites state */
.fav-empty{max-width:1060px;margin:0 auto;padding:3rem 1.5rem;text-align:center;display:none}
.fav-empty.show{display:block}
.fav-empty-icon{font-size:2.5rem;margin-bottom:.75rem}
.fav-empty-title{font-family:'DM Serif Display',serif;font-size:1.2rem;margin-bottom:.4rem}
.fav-empty-sub{font-size:.85rem;color:var(--muted);font-weight:300}

/* Post-result bookmark nudge */
.result-nudge{display:none;align-items:center;gap:10px;margin-top:.75rem;padding:.75rem 1rem;background:var(--surface);border:1px dashed var(--border);border-radius:var(--radius-sm);animation:fadeIn .3s ease}
.result-nudge.show{display:flex}
.nudge-text{font-size:.75rem;color:var(--muted);flex:1;line-height:1.4}
.nudge-btn{background:none;border:1px solid var(--border);border-radius:var(--radius-sm);padding:5px 12px;font-family:'DM Sans',sans-serif;font-size:.75rem;color:var(--muted);cursor:pointer;white-space:nowrap;transition:all var(--t);display:flex;align-items:center;gap:5px}
.nudge-btn:hover{border-color:var(--accent-mid);color:var(--accent);background:var(--accent-light)}

/* CITATIONS */
.citation-bar{display:flex;align-items:center;gap:8px;margin-top:.75rem;padding:.6rem .9rem;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);flex-wrap:wrap}
.citation-icon{font-size:.85rem;flex-shrink:0}
.citation-text{font-size:.72rem;color:var(--muted);line-height:1.5;flex:1}
.citation-text strong{color:var(--text);font-weight:500}
.citation-link{font-size:.72rem;color:var(--accent);font-weight:500;cursor:pointer;white-space:nowrap;text-decoration:underline;text-underline-offset:2px}
.citation-link:hover{color:var(--accent-mid)}

/* VERIFY MODAL */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:500;display:none;align-items:center;justify-content:center;padding:1.5rem;animation:fadeIn .2s ease}
.modal-overlay.show{display:flex}
.modal{background:var(--surface);border-radius:var(--radius);max-width:580px;width:100%;box-shadow:0 24px 64px rgba(0,0,0,.2);overflow:hidden;animation:slideUp .25s ease}
@keyframes slideUp{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 1.5rem;border-bottom:1px solid var(--border)}
.modal-title{font-family:'DM Serif Display',serif;font-size:1.2rem}
.modal-close{background:none;border:none;cursor:pointer;font-size:1.2rem;color:var(--muted);padding:4px;border-radius:var(--radius-sm);transition:color var(--t)}
.modal-close:hover{color:var(--text)}
.modal-body{padding:1.5rem;overflow-y:auto;max-height:70vh}
.modal-body p{font-size:.85rem;color:var(--muted);line-height:1.75;margin-bottom:1rem}
.modal-body h3{font-family:'DM Serif Display',serif;font-size:1rem;margin:.75rem 0 .4rem}
.cite-row{display:flex;align-items:flex-start;gap:10px;padding:.6rem 0;border-bottom:.5px solid var(--border);font-size:.82rem}
.cite-row:last-child{border-bottom:none}
.cite-num{width:22px;height:22px;border-radius:50%;background:var(--accent-light);color:var(--accent);font-size:.7rem;font-weight:500;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}
.cite-detail{line-height:1.6}
.cite-detail strong{color:var(--text);font-weight:500;display:block;margin-bottom:2px}
.cite-detail span{color:var(--muted)}

/* MOBILE BOTTOM NAV */
.mobile-nav{display:none;position:fixed;bottom:0;left:0;right:0;z-index:300;background:rgba(247,246,242,.97);backdrop-filter:blur(12px);border-top:1px solid var(--border);padding:0;height:56px}
.mobile-nav-inner{display:flex;height:100%}
.mobile-nav-btn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;background:none;border:none;cursor:pointer;font-family:'DM Sans',sans-serif;color:var(--muted);transition:color var(--t);padding:0;font-size:.6rem;font-weight:500;text-transform:uppercase;letter-spacing:.04em}
.mobile-nav-btn:hover,.mobile-nav-btn.active{color:var(--accent)}
.mobile-nav-btn .mnb-icon{font-size:1.1rem;line-height:1}
@media(max-width:480px){
  .mobile-nav{display:block}
  /* push page content up so it isn't hidden behind bottom nav */
  body{padding-bottom:60px}
  /* push bookmark banner above bottom nav */
  .bookmark-banner{bottom:4.5rem}
}
.cheat-section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.35rem;margin-bottom:1.1rem}
.cheat-section h2{font-family:'DM Serif Display',serif;font-size:1.05rem;margin-bottom:.9rem;padding-bottom:.5rem;border-bottom:1px solid var(--border)}
.formula-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px}
.formula-item{background:var(--bg);border-radius:var(--radius-sm);padding:.7rem .9rem}
.formula-name{font-size:.68rem;font-weight:500;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:3px}
.formula-text{font-family:monospace;font-size:.79rem;color:var(--text);line-height:1.5}

/* FOOTER */
footer{border-top:1px solid var(--border);padding:1.75rem;text-align:center;font-size:.78rem;color:var(--muted)}
footer strong{color:var(--text)}
footer span{cursor:pointer;color:var(--muted)}
footer span:hover{color:var(--text)}

.divider{height:1px;background:var(--border);margin:1rem 0}
.hidden{display:none!important}
@media(max-width:600px){.formula-grid{grid-template-columns:1fr}.hero-stats{gap:1.5rem}.hero h1{font-size:1.75rem}}

/* ABOUT / POLICY / CONTACT PAGES */
.info-page{max-width:740px;margin:0 auto;padding:2rem 1.5rem 4rem}
.info-page .breadcrumb{font-size:.8rem;color:var(--muted);margin-bottom:1.25rem;cursor:pointer}
.info-page .breadcrumb span{color:var(--accent);cursor:pointer}
.info-page .page-tag-info{display:inline-block;font-size:.7rem;font-weight:500;padding:3px 10px;border-radius:99px;text-transform:uppercase;letter-spacing:.05em;margin-bottom:.7rem;background:var(--accent-light);color:var(--accent)}
.info-page h1{font-family:'DM Serif Display',serif;font-size:clamp(1.6rem,4vw,2.1rem);line-height:1.2;letter-spacing:-.01em;margin-bottom:.5rem}
.info-page .lead{color:var(--muted);font-size:.9rem;font-weight:300;line-height:1.75;max-width:560px;margin-bottom:1.5rem}
.about-section{margin-bottom:2.25rem}
.about-section h2{font-family:'DM Serif Display',serif;font-size:1.2rem;margin-bottom:.65rem}
.about-section p{font-size:.875rem;color:var(--muted);line-height:1.85;margin-bottom:.65rem}
.value-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:1.1rem 0}
.value-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:1rem 1.1rem}
.value-icon{font-size:1.3rem;margin-bottom:.5rem;display:block}
.value-title{font-size:.875rem;font-weight:500;color:var(--text);margin-bottom:.3rem}
.value-desc{font-size:.8rem;color:var(--muted);line-height:1.6}
.mission-banner{background:var(--accent-light);border:1px solid #B6DECA;border-radius:var(--radius);padding:1.4rem 1.5rem;margin:1.25rem 0;text-align:center}
.mission-banner p{font-family:'DM Serif Display',serif;font-size:1.1rem;color:var(--accent);margin:0;font-style:italic;line-height:1.5}
.about-ref-row{display:flex;align-items:flex-start;gap:10px;padding:.55rem 0;border-bottom:1px solid var(--border);font-size:.82rem}
.about-ref-row:last-child{border-bottom:none}
.about-ref-num{width:22px;height:22px;border-radius:50%;background:var(--accent-light);color:var(--accent);font-size:.7rem;font-weight:500;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}
.about-ref-text{color:var(--muted);line-height:1.6}
.about-ref-text strong{color:var(--text);display:block}
.policy-section{margin-bottom:1.75rem}
.policy-section h2{font-family:'DM Serif Display',serif;font-size:1.05rem;margin-bottom:.55rem;color:var(--text)}
.policy-section p{font-size:.85rem;color:var(--muted);line-height:1.8;margin-bottom:.65rem}
.policy-section ul{font-size:.85rem;color:var(--muted);line-height:1.8;padding-left:1.25rem;margin-bottom:.65rem}
.policy-section ul li{margin-bottom:.25rem}
.policy-section a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
.policy-date{font-size:.77rem;color:var(--muted);background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.55rem 1rem;display:inline-block;margin-bottom:1.75rem}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:1.25rem 0}
.contact-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:1rem 1.1rem;transition:border-color var(--t)}
.contact-card:hover{border-color:var(--accent-mid)}
.contact-card-icon{font-size:1.3rem;margin-bottom:.5rem;display:block}
.contact-card h3{font-family:'DM Serif Display',serif;font-size:.95rem;margin-bottom:.35rem}
.contact-card p{font-size:.8rem;color:var(--muted);line-height:1.6}
.form-wrap{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;margin:1.25rem 0}
.form-wrap-title{font-family:'DM Serif Display',serif;font-size:1.1rem;margin-bottom:.3rem}
.form-wrap-sub{font-size:.8rem;color:var(--muted);margin-bottom:1.1rem;line-height:1.5}
textarea{width:100%;padding:.65rem .9rem;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:'DM Sans',sans-serif;font-size:.875rem;color:var(--text);background:var(--bg);outline:none;resize:vertical;min-height:120px;line-height:1.6;transition:border-color var(--t)}
textarea:focus{border-color:var(--accent-mid);background:#fff}
.contact-success{display:none;background:var(--accent-light);border:1px solid #B6DECA;border-radius:var(--radius-sm);padding:.9rem 1.1rem;font-size:.875rem;color:var(--accent);text-align:center;margin-top:.75rem;animation:fadeIn .3s ease}
.contact-success.show{display:block}
@media(max-width:480px){.value-grid,.contact-grid{grid-template-columns:1fr}}

.fav-btn{top:.7rem;right:.7rem;font-size:1rem}

  /* Calc page fields */
  .calc-page{padding:1rem 1rem 2.5rem}
  .calc-box{padding:1.1rem}
  .field-row{flex-direction:column;gap:0}
  .field-row .field{margin-bottom:.6rem}
  .result-value{font-size:1.5rem}

  /* Bookmark banner */
  .bookmark-banner{bottom:1rem;max-width:calc(100% - 2rem)}
  .bb-sub{display:none}

  /* Post-result nudge */
  .result-nudge{flex-direction:column;align-items:flex-start;gap:8px}
  .nudge-btn{align-self:flex-end}

  /* Cheatsheet formula grid */
  .formula-grid{grid-template-columns:1fr}

  /* Related grid */
  .related-grid{grid-template-columns:1fr 1fr}
}

/* CALC PAGE */
.calc-page{max-width:680px;margin:0 auto;padding:1.5rem 1.5rem 3.5rem}
.breadcrumb{font-size:.8rem;color:var(--muted);margin-bottom:1.25rem;display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.breadcrumb span{cursor:pointer;color:var(--muted)}
.breadcrumb span:hover{color:var(--text)}
.breadcrumb-sep{color:var(--border)}
.page-tag{display:inline-block;font-size:.7rem;font-weight:500;padding:3px 10px;border-radius:99px;text-transform:uppercase;letter-spacing:.05em;margin-bottom:.7rem}
.calc-page h1{font-family:'DM Serif Display',serif;font-size:clamp(1.5rem,4vw,2rem);line-height:1.2;letter-spacing:-.01em;margin-bottom:.5rem}
.page-desc{color:var(--muted);font-size:.88rem;font-weight:300;line-height:1.75;max-width:540px;margin-bottom:1.5rem}

/* CALC BOX */
.calc-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.75rem;box-shadow:var(--shadow);margin-bottom:1.5rem}
.field{margin-bottom:.85rem}
.field label{display:block;font-size:.72rem;font-weight:500;color:var(--muted);margin-bottom:5px;text-transform:uppercase;letter-spacing:.05em}
.field-row{display:flex;gap:8px}
.field-row .field{flex:1;margin-bottom:0}
input[type="number"],input[type="date"],select,input[type="text"]{width:100%;padding:.6rem .875rem;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:'DM Sans',sans-serif;font-size:.875rem;color:var(--text);background:var(--bg);outline:none;transition:border-color var(--t)}
input[type="number"]::-webkit-inner-spin-button{-webkit-appearance:none}
input[type="number"]:focus,select:focus,input[type="date"]:focus{border-color:var(--accent-mid);background:#fff}
select{cursor:pointer}
.calc-btn{width:100%;padding:.7rem;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);font-family:'DM Sans',sans-serif;font-size:.875rem;font-weight:500;cursor:pointer;transition:background var(--t),transform var(--t);margin-top:.2rem}
.calc-btn:hover{background:var(--accent-mid)}
.calc-btn:active{transform:scale(.98)}
.calc-btn-sec{background:transparent;color:var(--muted);border:1px solid var(--border);margin-top:7px;font-size:.8rem}
.calc-btn-sec:hover{background:var(--bg);color:var(--text)}

/* RESULT */
.result-box{border-radius:var(--radius-sm);padding:1.1rem 1.25rem;display:none;animation:fadeIn .2s ease;margin-top:.9rem}
.result-box.show{display:block}
.result-box.success{background:var(--accent-light);border:1px solid #B6DECA}
.result-box.warn{background:var(--amber-light);border:1px solid #F5D28A}
.result-box.danger{background:var(--red-light);border:1px solid #F0B8B3}
.result-box.info{background:var(--blue-light);border:1px solid #B5D4F4}
.result-label{font-size:.7rem;font-weight:500;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:3px}
.result-value{font-family:'DM Serif Display',serif;font-size:1.9rem;color:var(--text);line-height:1.15}
.result-sub{font-size:.77rem;color:var(--muted);margin-top:5px;font-weight:300;line-height:1.5}

/* INFO */
.info-section{margin-top:1.5rem}
.info-section h2{font-family:'DM Serif Display',serif;font-size:1.1rem;margin-bottom:.7rem}
.info-section p{font-size:.85rem;color:var(--muted);line-height:1.75;margin-bottom:.6rem}
.formula-box{background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--accent-mid);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:.9rem 1.1rem;font-family:monospace;font-size:.82rem;color:var(--text);margin:.85rem 0;line-height:1.6}
.ref-table{width:100%;border-collapse:collapse;font-size:.8rem;margin:.85rem 0}
.ref-table th{background:var(--bg);padding:7px 11px;text-align:left;font-weight:500;border-bottom:1px solid var(--border);color:var(--muted);font-size:.7rem;text-transform:uppercase;letter-spacing:.04em}
.ref-table td{padding:7px 11px;border-bottom:1px solid var(--border);color:var(--text)}
.ref-table tr:last-child td{border-bottom:none}
.ref-table tr:hover td{background:var(--bg)}

/* RELATED */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px;margin-top:.85rem}
.related-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.8rem 1rem;text-decoration:none;color:var(--text);display:flex;align-items:center;gap:9px;transition:all var(--t);font-size:.8rem;font-weight:500;cursor:pointer}
.related-card:hover{border-color:var(--accent-mid);transform:translateY(-1px)}

/* DISCLAIMER */
.disc-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.9rem 1.1rem;font-size:.77rem;color:var(--muted);line-height:1.6;margin-top:1.25rem}

/* ── RETENTION HOOKS ── */

/* Bookmark banner */
.bookmark-banner{position:fixed;bottom:1.5rem;left:50%;transform:translateX(-50%) translateY(120px);z-index:999;background:var(--text);color:#fff;border-radius:var(--radius);padding:1rem 1.25rem;display:flex;align-items:center;gap:12px;box-shadow:0 8px 32px rgba(0,0,0,.2);max-width:420px;width:calc(100% - 3rem);transition:transform .4s cubic-bezier(.34,1.56,.64,1);pointer-events:none;opacity:0}
.bookmark-banner.show{transform:translateX(-50%) translateY(0);pointer-events:all;opacity:1}
.bb-icon{font-size:1.4rem;flex-shrink:0}
.bb-text{flex:1}
.bb-title{font-size:.85rem;font-weight:500;margin-bottom:2px}
.bb-sub{font-size:.75rem;color:rgba(255,255,255,.65);line-height:1.4}
.bb-btn{background:var(--accent-mid);color:#fff;border:none;border-radius:var(--radius-sm);padding:7px 14px;font-family:'DM Sans',sans-serif;font-size:.78rem;font-weight:500;cursor:pointer;white-space:nowrap;transition:background var(--t)}
.bb-btn:hover{background:#24c47e}
.bb-close{background:none;border:none;color:rgba(255,255,255,.5);cursor:pointer;font-size:1.1rem;padding:0 4px;line-height:1;flex-shrink:0;transition:color var(--t)}
.bb-close:hover{color:#fff}

/* Heart / favourite button on calc cards */
.fav-btn{position:absolute;top:.85rem;right:.85rem;background:none;border:none;cursor:pointer;font-size:1.1rem;line-height:1;padding:4px;border-radius:50%;transition:transform .2s ease,background var(--t);z-index:2}
.fav-btn:hover{transform:scale(1.2);background:var(--bg)}
.fav-btn.active{animation:heartPop .3s ease}
@keyframes heartPop{0%{transform:scale(1)}50%{transform:scale(1.4)}100%{transform:scale(1)}}
.calc-card{position:relative}

/* Favourites tab strip addition */
.cat-tab.fav-tab{border-color:var(--red);color:var(--red)}
.cat-tab.fav-tab:hover{background:var(--red-light);border-color:var(--red)}
.cat-tab.fav-tab.active{background:var(--red);border-color:var(--red);color:#fff}
.cat-tab.fav-tab.active .tab-count{background:rgba(255,255,255,.25);color:#fff}

/* Empty favourites state */
.fav-empty{max-width:1060px;margin:0 auto;padding:3rem 1.5rem;text-align:center;display:none}
.fav-empty.show{display:block}
.fav-empty-icon{font-size:2.5rem;margin-bottom:.75rem}
.fav-empty-title{font-family:'DM Serif Display',serif;font-size:1.2rem;margin-bottom:.4rem}
.fav-empty-sub{font-size:.85rem;color:var(--muted);font-weight:300}

/* Post-result bookmark nudge */
.result-nudge{flex-direction:column;align-items:flex-start;gap:8px}
  .nudge-btn{align-self:flex-end}

  /* Cheatsheet formula grid */
  .formula-grid{grid-template-columns:1fr}

  /* Related grid */
  .related-grid{grid-template-columns:1fr 1fr}
}

/* CALC PAGE */
.calc-page{max-width:680px;margin:0 auto;padding:1.5rem 1.5rem 3.5rem}
.breadcrumb{font-size:.8rem;color:var(--muted);margin-bottom:1.25rem;display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.breadcrumb span{cursor:pointer;color:var(--muted)}
.breadcrumb span:hover{color:var(--text)}
.breadcrumb-sep{color:var(--border)}
.page-tag{display:inline-block;font-size:.7rem;font-weight:500;padding:3px 10px;border-radius:99px;text-transform:uppercase;letter-spacing:.05em;margin-bottom:.7rem}
.calc-page h1{font-family:'DM Serif Display',serif;font-size:clamp(1.5rem,4vw,2rem);line-height:1.2;letter-spacing:-.01em;margin-bottom:.5rem}
.page-desc{color:var(--muted);font-size:.88rem;font-weight:300;line-height:1.75;max-width:540px;margin-bottom:1.5rem}

/* CALC BOX */
.calc-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.75rem;box-shadow:var(--shadow);margin-bottom:1.5rem}
.field{margin-bottom:.85rem}
.field label{display:block;font-size:.72rem;font-weight:500;color:var(--muted);margin-bottom:5px;text-transform:uppercase;letter-spacing:.05em}
.field-row{display:flex;gap:8px}
.field-row .field{flex:1;margin-bottom:0}
input[type="number"],input[type="date"],select,input[type="text"]{width:100%;padding:.6rem .875rem;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:'DM Sans',sans-serif;font-size:.875rem;color:var(--text);background:var(--bg);outline:none;transition:border-color var(--t)}
input[type="number"]::-webkit-inner-spin-button{-webkit-appearance:none}
input[type="number"]:focus,select:focus,input[type="date"]:focus{border-color:var(--accent-mid);background:#fff}
select{cursor:pointer}
.calc-btn{width:100%;padding:.7rem;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);font-family:'DM Sans',sans-serif;font-size:.875rem;font-weight:500;cursor:pointer;transition:background var(--t),transform var(--t);margin-top:.2rem}
.calc-btn:hover{background:var(--accent-mid)}
.calc-btn:active{transform:scale(.98)}
.calc-btn-sec{background:transparent;color:var(--muted);border:1px solid var(--border);margin-top:7px;font-size:.8rem}
.calc-btn-sec:hover{background:var(--bg);color:var(--text)}

/* RESULT */
.result-box{border-radius:var(--radius-sm);padding:1.1rem 1.25rem;display:none;animation:fadeIn .2s ease;margin-top:.9rem}
.result-box.show{display:block}
.result-box.success{background:var(--accent-light);border:1px solid #B6DECA}
.result-box.warn{background:var(--amber-light);border:1px solid #F5D28A}
.result-box.danger{background:var(--red-light);border:1px solid #F0B8B3}
.result-box.info{background:var(--blue-light);border:1px solid #B5D4F4}
.result-label{font-size:.7rem;font-weight:500;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:3px}
.result-value{font-family:'DM Serif Display',serif;font-size:1.9rem;color:var(--text);line-height:1.15}
.result-sub{font-size:.77rem;color:var(--muted);margin-top:5px;font-weight:300;line-height:1.5}

/* INFO */
.info-section{margin-top:1.5rem}
.info-section h2{font-family:'DM Serif Display',serif;font-size:1.1rem;margin-bottom:.7rem}
.info-section p{font-size:.85rem;color:var(--muted);line-height:1.75;margin-bottom:.6rem}
.formula-box{background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--accent-mid);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:.9rem 1.1rem;font-family:monospace;font-size:.82rem;color:var(--text);margin:.85rem 0;line-height:1.6}
.ref-table{width:100%;border-collapse:collapse;font-size:.8rem;margin:.85rem 0}
.ref-table th{background:var(--bg);padding:7px 11px;text-align:left;font-weight:500;border-bottom:1px solid var(--border);color:var(--muted);font-size:.7rem;text-transform:uppercase;letter-spacing:.04em}
.ref-table td{padding:7px 11px;border-bottom:1px solid var(--border);color:var(--text)}
.ref-table tr:last-child td{border-bottom:none}
.ref-table tr:hover td{background:var(--bg)}

/* RELATED */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px;margin-top:.85rem}
.related-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.8rem 1rem;text-decoration:none;color:var(--text);display:flex;align-items:center;gap:9px;transition:all var(--t);font-size:.8rem;font-weight:500;cursor:pointer}
.related-card:hover{border-color:var(--accent-mid);transform:translateY(-1px)}

/* DISCLAIMER */
.disc-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.9rem 1.1rem;font-size:.77rem;color:var(--muted);line-height:1.6;margin-top:1.25rem}

/* ── RETENTION HOOKS ── */

/* Bookmark banner */
.bookmark-banner{position:fixed;bottom:1.5rem;left:50%;transform:translateX(-50%) translateY(120px);z-index:999;background:var(--text);color:#fff;border-radius:var(--radius);padding:1rem 1.25rem;display:flex;align-items:center;gap:12px;box-shadow:0 8px 32px rgba(0,0,0,.2);max-width:420px;width:calc(100% - 3rem);transition:transform .4s cubic-bezier(.34,1.56,.64,1);pointer-events:none;opacity:0}
.bookmark-banner.show{transform:translateX(-50%) translateY(0);pointer-events:all;opacity:1}
.bb-icon{font-size:1.4rem;flex-shrink:0}
.bb-text{flex:1}
.bb-title{font-size:.85rem;font-weight:500;margin-bottom:2px}
.bb-sub{font-size:.75rem;color:rgba(255,255,255,.65);line-height:1.4}
.bb-btn{background:var(--accent-mid);color:#fff;border:none;border-radius:var(--radius-sm);padding:7px 14px;font-family:'DM Sans',sans-serif;font-size:.78rem;font-weight:500;cursor:pointer;white-space:nowrap;transition:background var(--t)}
.bb-btn:hover{background:#24c47e}
.bb-close{background:none;border:none;color:rgba(255,255,255,.5);cursor:pointer;font-size:1.1rem;padding:0 4px;line-height:1;flex-shrink:0;transition:color var(--t)}
.bb-close:hover{color:#fff}

/* Heart / favourite button on calc cards */
.fav-btn{position:absolute;top:.85rem;right:.85rem;background:none;border:none;cursor:pointer;font-size:1.1rem;line-height:1;padding:4px;border-radius:50%;transition:transform .2s ease,background var(--t);z-index:2}
.fav-btn:hover{transform:scale(1.2);background:var(--bg)}
.fav-btn.active{animation:heartPop .3s ease}
@keyframes heartPop{0%{transform:scale(1)}50%{transform:scale(1.4)}100%{transform:scale(1)}}
.calc-card{position:relative}

/* Favourites tab strip addition */
.cat-tab.fav-tab{border-color:var(--red);color:var(--red)}
.cat-tab.fav-tab:hover{background:var(--red-light);border-color:var(--red)}
.cat-tab.fav-tab.active{background:var(--red);border-color:var(--red);color:#fff}
.cat-tab.fav-tab.active .tab-count{background:rgba(255,255,255,.25);color:#fff}

/* Empty favourites state */
.fav-empty{max-width:1060px;margin:0 auto;padding:3rem 1.5rem;text-align:center;display:none}
.fav-empty.show{display:block}
.fav-empty-icon{font-size:2.5rem;margin-bottom:.75rem}
.fav-empty-title{font-family:'DM Serif Display',serif;font-size:1.2rem;margin-bottom:.4rem}
.fav-empty-sub{font-size:.85rem;color:var(--muted);font-weight:300}

/* Post-result bookmark nudge */
.result-nudge{display:none;align-items:center;gap:10px;margin-top:.75rem;padding:.75rem 1rem;background:var(--surface);border:1px dashed var(--border);border-radius:var(--radius-sm);animation:fadeIn .3s ease}
.result-nudge.show{display:flex}
.nudge-text{font-size:.75rem;color:var(--muted);flex:1;line-height:1.4}
.nudge-btn{background:none;border:1px solid var(--border);border-radius:var(--radius-sm);padding:5px 12px;font-family:'DM Sans',sans-serif;font-size:.75rem;color:var(--muted);cursor:pointer;white-space:nowrap;transition:all var(--t);display:flex;align-items:center;gap:5px}
.nudge-btn:hover{border-color:var(--accent-mid);color:var(--accent);background:var(--accent-light)}
.bookmark-banner{bottom:1rem;max-width:calc(100% - 2rem)}
  .bb-sub{display:none}

  /* Post-result nudge */
  .result-nudge{flex-direction:column;align-items:flex-start;gap:8px}
  .nudge-btn{align-self:flex-end}

  /* Cheatsheet formula grid */
  .formula-grid{grid-template-columns:1fr}

  /* Related grid */
  .related-grid{grid-template-columns:1fr 1fr}
}

/* CALC PAGE */
.calc-page{max-width:680px;margin:0 auto;padding:1.5rem 1.5rem 3.5rem}
.breadcrumb{font-size:.8rem;color:var(--muted);margin-bottom:1.25rem;display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.breadcrumb span{cursor:pointer;color:var(--muted)}
.breadcrumb span:hover{color:var(--text)}
.breadcrumb-sep{color:var(--border)}
.page-tag{display:inline-block;font-size:.7rem;font-weight:500;padding:3px 10px;border-radius:99px;text-transform:uppercase;letter-spacing:.05em;margin-bottom:.7rem}
.calc-page h1{font-family:'DM Serif Display',serif;font-size:clamp(1.5rem,4vw,2rem);line-height:1.2;letter-spacing:-.01em;margin-bottom:.5rem}
.page-desc{color:var(--muted);font-size:.88rem;font-weight:300;line-height:1.75;max-width:540px;margin-bottom:1.5rem}

/* CALC BOX */
.calc-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.75rem;box-shadow:var(--shadow);margin-bottom:1.5rem}
.field{margin-bottom:.85rem}
.field label{display:block;font-size:.72rem;font-weight:500;color:var(--muted);margin-bottom:5px;text-transform:uppercase;letter-spacing:.05em}
.field-row{display:flex;gap:8px}
.field-row .field{flex:1;margin-bottom:0}
input[type="number"],input[type="date"],select,input[type="text"]{width:100%;padding:.6rem .875rem;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:'DM Sans',sans-serif;font-size:.875rem;color:var(--text);background:var(--bg);outline:none;transition:border-color var(--t)}
input[type="number"]::-webkit-inner-spin-button{-webkit-appearance:none}
input[type="number"]:focus,select:focus,input[type="date"]:focus{border-color:var(--accent-mid);background:#fff}
select{cursor:pointer}
.calc-btn{width:100%;padding:.7rem;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);font-family:'DM Sans',sans-serif;font-size:.875rem;font-weight:500;cursor:pointer;transition:background var(--t),transform var(--t);margin-top:.2rem}
.calc-btn:hover{background:var(--accent-mid)}
.calc-btn:active{transform:scale(.98)}
.calc-btn-sec{background:transparent;color:var(--muted);border:1px solid var(--border);margin-top:7px;font-size:.8rem}
.calc-btn-sec:hover{background:var(--bg);color:var(--text)}

/* RESULT */
.result-box{border-radius:var(--radius-sm);padding:1.1rem 1.25rem;display:none;animation:fadeIn .2s ease;margin-top:.9rem}
.result-box.show{display:block}
.result-box.success{background:var(--accent-light);border:1px solid #B6DECA}
.result-box.warn{background:var(--amber-light);border:1px solid #F5D28A}
.result-box.danger{background:var(--red-light);border:1px solid #F0B8B3}
.result-box.info{background:var(--blue-light);border:1px solid #B5D4F4}
.result-label{font-size:.7rem;font-weight:500;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:3px}
.result-value{font-family:'DM Serif Display',serif;font-size:1.9rem;color:var(--text);line-height:1.15}
.result-sub{font-size:.77rem;color:var(--muted);margin-top:5px;font-weight:300;line-height:1.5}

/* INFO */
.info-section{margin-top:1.5rem}
.info-section h2{font-family:'DM Serif Display',serif;font-size:1.1rem;margin-bottom:.7rem}
.info-section p{font-size:.85rem;color:var(--muted);line-height:1.75;margin-bottom:.6rem}
.formula-box{background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--accent-mid);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:.9rem 1.1rem;font-family:monospace;font-size:.82rem;color:var(--text);margin:.85rem 0;line-height:1.6}
.ref-table{width:100%;border-collapse:collapse;font-size:.8rem;margin:.85rem 0}
.ref-table th{background:var(--bg);padding:7px 11px;text-align:left;font-weight:500;border-bottom:1px solid var(--border);color:var(--muted);font-size:.7rem;text-transform:uppercase;letter-spacing:.04em}
.ref-table td{padding:7px 11px;border-bottom:1px solid var(--border);color:var(--text)}
.ref-table tr:last-child td{border-bottom:none}
.ref-table tr:hover td{background:var(--bg)}

/* RELATED */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px;margin-top:.85rem}
.related-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.8rem 1rem;text-decoration:none;color:var(--text);display:flex;align-items:center;gap:9px;transition:all var(--t);font-size:.8rem;font-weight:500;cursor:pointer}
.related-card:hover{border-color:var(--accent-mid);transform:translateY(-1px)}

/* DISCLAIMER */
.disc-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.9rem 1.1rem;font-size:.77rem;color:var(--muted);line-height:1.6;margin-top:1.25rem}

/* ── RETENTION HOOKS ── */

/* Bookmark banner */
.bookmark-banner{position:fixed;bottom:1.5rem;left:50%;transform:translateX(-50%) translateY(120px);z-index:999;background:var(--text);color:#fff;border-radius:var(--radius);padding:1rem 1.25rem;display:flex;align-items:center;gap:12px;box-shadow:0 8px 32px rgba(0,0,0,.2);max-width:420px;width:calc(100% - 3rem);transition:transform .4s cubic-bezier(.34,1.56,.64,1);pointer-events:none;opacity:0}
.bookmark-banner.show{transform:translateX(-50%) translateY(0);pointer-events:all;opacity:1}
.bb-icon{font-size:1.4rem;flex-shrink:0}
.bb-text{flex:1}
.bb-title{font-size:.85rem;font-weight:500;margin-bottom:2px}
.bb-sub{font-size:.75rem;color:rgba(255,255,255,.65);line-height:1.4}
.bb-btn{background:var(--accent-mid);color:#fff;border:none;border-radius:var(--radius-sm);padding:7px 14px;font-family:'DM Sans',sans-serif;font-size:.78rem;font-weight:500;cursor:pointer;white-space:nowrap;transition:background var(--t)}
.bb-btn:hover{background:#24c47e}
.bb-close{background:none;border:none;color:rgba(255,255,255,.5);cursor:pointer;font-size:1.1rem;padding:0 4px;line-height:1;flex-shrink:0;transition:color var(--t)}
.bb-close:hover{color:#fff}

/* Heart / favourite button on calc cards */
.fav-btn{position:absolute;top:.85rem;right:.85rem;background:none;border:none;cursor:pointer;font-size:1.1rem;line-height:1;padding:4px;border-radius:50%;transition:transform .2s ease,background var(--t);z-index:2}
.fav-btn:hover{transform:scale(1.2);background:var(--bg)}
.fav-btn.active{animation:heartPop .3s ease}
@keyframes heartPop{0%{transform:scale(1)}50%{transform:scale(1.4)}100%{transform:scale(1)}}
.calc-card{position:relative}

/* Favourites tab strip addition */
.cat-tab.fav-tab{border-color:var(--red);color:var(--red)}
.cat-tab.fav-tab:hover{background:var(--red-light);border-color:var(--red)}
.cat-tab.fav-tab.active{background:var(--red);border-color:var(--red);color:#fff}
.cat-tab.fav-tab.active .tab-count{background:rgba(255,255,255,.25);color:#fff}

/* Empty favourites state */
.fav-empty{max-width:1060px;margin:0 auto;padding:3rem 1.5rem;text-align:center;display:none}
.fav-empty.show{display:block}
.fav-empty-icon{font-size:2.5rem;margin-bottom:.75rem}
.fav-empty-title{font-family:'DM Serif Display',serif;font-size:1.2rem;margin-bottom:.4rem}
.fav-empty-sub{font-size:.85rem;color:var(--muted);font-weight:300}

/* Post-result bookmark nudge */
.result-nudge{display:none;align-items:center;gap:10px;margin-top:.75rem;padding:.75rem 1rem;background:var(--surface);border:1px dashed var(--border);border-radius:var(--radius-sm);animation:fadeIn .3s ease}
.result-nudge.show{display:flex}
.nudge-text{font-size:.75rem;color:var(--muted);flex:1;line-height:1.4}
.nudge-btn{background:none;border:1px solid var(--border);border-radius:var(--radius-sm);padding:5px 12px;font-family:'DM Sans',sans-serif;font-size:.75rem;color:var(--muted);cursor:pointer;white-space:nowrap;transition:all var(--t);display:flex;align-items:center;gap:5px}
.nudge-btn:hover{border-color:var(--accent-mid);color:var(--accent);background:var(--accent-light)}

/* CITATIONS */
.citation-bar{display:flex;align-items:center;gap:8px;margin-top:.75rem;padding:.6rem .9rem;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);flex-wrap:wrap}
.citation-icon{font-size:.85rem;flex-shrink:0}
.citation-text{font-size:.72rem;color:var(--muted);line-height:1.5;flex:1}
.citation-text strong{color:var(--text);font-weight:500}
.citation-link{font-size:.72rem;color:var(--accent);font-weight:500;cursor:pointer;white-space:nowrap;text-decoration:underline;text-underline-offset:2px}
.citation-link:hover{color:var(--accent-mid)}
/* CITATIONS */
.citation-bar{display:flex;align-items:center;gap:8px;margin-top:.75rem;padding:.6rem .9rem;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);flex-wrap:wrap}
.citation-icon{font-size:.85rem;flex-shrink:0}
.citation-text{font-size:.72rem;color:var(--muted);line-height:1.5;flex:1}
.citation-text strong{color:var(--text);font-weight:500}
.citation-link{font-size:.72rem;color:var(--accent);font-weight:500;cursor:pointer;white-space:nowrap;text-decoration:underline;text-underline-offset:2px}
.citation-link:hover{color:var(--accent-mid)}

/* VERIFY MODAL */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:500;display:none;align-items:center;justify-content:center;padding:1.5rem;animation:fadeIn .2s ease}
.modal-overlay.show{display:flex}
.modal{background:var(--surface);border-radius:var(--radius);max-width:580px;width:100%;box-shadow:0 24px 64px rgba(0,0,0,.2);overflow:hidden;animation:slideUp .25s ease}
@keyframes slideUp{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 1.5rem;border-bottom:1px solid var(--border)}
.modal-title{font-family:'DM Serif Display',serif;font-size:1.2rem}
.modal-close{background:none;border:none;cursor:pointer;font-size:1.2rem;color:var(--muted);padding:4px;border-radius:var(--radius-sm);transition:color var(--t)}
.modal-close:hover{color:var(--text)}
.modal-body{padding:1.5rem;overflow-y:auto;max-height:70vh}
.modal-body p{font-size:.85rem;color:var(--muted);line-height:1.75;margin-bottom:1rem}
.modal-body h3{font-family:'DM Serif Display',serif;font-size:1rem;margin:.75rem 0 .4rem}
.cite-row{display:flex;align-items:flex-start;gap:10px;padding:.6rem 0;border-bottom:.5px solid var(--border);font-size:.82rem}
.cite-row:last-child{border-bottom:none}
.cite-num{width:22px;height:22px;border-radius:50%;background:var(--accent-light);color:var(--accent);font-size:.7rem;font-weight:500;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}
.cite-detail{line-height:1.6}
.cite-detail strong{color:var(--text);font-weight:500;display:block;margin-bottom:2px}
.cite-detail span{color:var(--muted)}

/* MOBILE BOTTOM NAV */
.mobile-nav{display:none;position:fixed;bottom:0;left:0;right:0;z-index:300;background:rgba(247,246,242,.97);backdrop-filter:blur(12px);border-top:1px solid var(--border);padding:0;height:56px}
.mobile-nav-inner{display:flex;height:100%}
.mobile-nav-btn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;background:none;border:none;cursor:pointer;font-family:'DM Sans',sans-serif;color:var(--muted);transition:color var(--t);padding:0;font-size:.6rem;font-weight:500;text-transform:uppercase;letter-spacing:.04em}
.mobile-nav-btn:hover,.mobile-nav-btn.active{color:var(--accent)}
.mobile-nav-btn .mnb-icon{font-size:1.1rem;line-height:1}
@media(max-width:480px){
  .mobile-nav{display:block}
  /* push page content up so it isn't hidden behind bottom nav */
  body{padding-bottom:60px}
  /* push bookmark banner above bottom nav */