/* ── ABOUTSEPTICTANKS.COM — LIGHT INFORMATIONAL THEME ─────── */
@import url('https://fonts.googleapis.com/css2?family=Nunito+Sans:wght@400;600;700;800;900&family=Inter:wght@400;500;600&display=swap');

:root {
  --teal:#0d9488; --teal-dark:#0f766e; --teal-light:#f0fdfa;
  --navy:#1e293b; --text:#334155; --muted:#64748b;
  --bg:#f8fafc; --white:#ffffff; --border:#e2e8f0;
  --shadow:0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.05);
  --shadow-md:0 4px 6px rgba(0,0,0,.07),0 2px 4px rgba(0,0,0,.05);
  --radius:10px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:'Inter',system-ui,sans-serif;font-size:1rem;line-height:1.7;color:var(--text);background:var(--bg);}
h1,h2,h3,h4{font-family:'Nunito Sans',sans-serif;font-weight:800;color:var(--navy);line-height:1.25;}
h1{font-size:clamp(1.8rem,4vw,2.6rem);}
h2{font-size:clamp(1.3rem,3vw,1.7rem);margin:2rem 0 .75rem;}
h3{font-size:1.1rem;margin:1.5rem 0 .5rem;}
p{margin-bottom:1rem;}
a{color:var(--teal);text-decoration:none;}
a:hover{color:var(--teal-dark);text-decoration:underline;}
ul,ol{padding-left:1.5rem;margin-bottom:1rem;}
li{margin-bottom:.35rem;}
strong{font-weight:700;color:var(--navy);}

/* NAV */
nav{background:#fff;border-bottom:1px solid var(--border);box-shadow:var(--shadow);position:sticky;top:0;z-index:100;}
.nav-inner{max-width:1100px;margin:0 auto;padding:0 1.5rem;display:flex;align-items:center;justify-content:space-between;height:64px;}
.nav-logo{font-family:'Nunito Sans',sans-serif;font-weight:900;font-size:1.15rem;color:var(--navy);text-decoration:none;}
.nav-logo span{color:var(--teal);}
.nav-links{display:flex;gap:1.5rem;}
.nav-links a{font-size:.88rem;font-weight:600;color:var(--muted);text-decoration:none;transition:color .15s;}
.nav-links a:hover{color:var(--teal);text-decoration:none;}
.nav-cta{background:var(--teal);color:#fff !important;padding:.45rem 1.1rem;border-radius:6px;font-size:.82rem;font-weight:700;letter-spacing:.5px;text-transform:uppercase;}
.nav-cta:hover{background:var(--teal-dark) !important;text-decoration:none;}

/* HERO */
.hero{background:linear-gradient(135deg,#0f766e 0%,#0d9488 50%,#14b8a6 100%);padding:4rem 1.5rem;text-align:center;}
.hero-inner{max-width:720px;margin:0 auto;}
.hero h1{color:#fff;font-size:clamp(1.9rem,5vw,3rem);margin-bottom:1rem;}
.hero p{color:rgba(255,255,255,.85);font-size:1.1rem;margin-bottom:2rem;}
.hero-btns{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;}

/* BUTTONS */
.btn-primary{display:inline-flex;align-items:center;justify-content:center;background:#fff;color:var(--teal-dark);font-weight:700;font-size:.88rem;letter-spacing:.5px;text-transform:uppercase;text-decoration:none;padding:.75rem 1.75rem;border-radius:8px;border:2px solid #fff;transition:all .15s;}
.btn-primary:hover{background:var(--teal-light);text-decoration:none;}
.btn-outline{display:inline-flex;align-items:center;justify-content:center;background:transparent;color:#fff;font-weight:700;font-size:.88rem;text-decoration:none;padding:.75rem 1.75rem;border-radius:8px;border:2px solid rgba(255,255,255,.6);transition:all .15s;}
.btn-outline:hover{border-color:#fff;background:rgba(255,255,255,.1);text-decoration:none;}
.btn-teal{display:inline-flex;align-items:center;justify-content:center;background:var(--teal);color:#fff;font-weight:700;font-size:.88rem;letter-spacing:.5px;text-transform:uppercase;text-decoration:none;padding:.7rem 1.5rem;border-radius:8px;transition:background .15s;}
.btn-teal:hover{background:var(--teal-dark);text-decoration:none;}
.btn-blue{display:inline-flex;align-items:center;justify-content:center;background:#1d4ed8;color:#fff;font-weight:700;font-size:.88rem;letter-spacing:.5px;text-transform:uppercase;text-decoration:none;padding:.7rem 1.5rem;border-radius:8px;transition:background .15s;}
.btn-blue:hover{background:#1e40af;text-decoration:none;}

/* LAYOUT */
.container{max-width:1100px;margin:0 auto;padding:0 1.5rem;}
.page-wrap{max-width:1100px;margin:0 auto;padding:2.5rem 1.5rem;display:grid;grid-template-columns:1fr 300px;gap:2.5rem;align-items:start;}
@media(max-width:768px){.page-wrap{grid-template-columns:1fr;}}
article{min-width:0;}

/* PAGE HEADER */
.page-header{background:linear-gradient(135deg,#0f766e,#0d9488);padding:3rem 1.5rem 2.5rem;}
.page-header-inner{max-width:1100px;margin:0 auto;}
.breadcrumb{font-size:.8rem;color:rgba(255,255,255,.7);margin-bottom:.75rem;}
.breadcrumb a{color:rgba(255,255,255,.8);}
.breadcrumb span{margin:0 .4rem;}
.page-tag{font-size:.75rem;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:rgba(255,255,255,.7);margin-bottom:.6rem;}
.page-header h1{color:#fff;margin-bottom:.75rem;}
.page-header .lead{color:rgba(255,255,255,.85);font-size:1.05rem;max-width:640px;}
.meta-row{display:flex;gap:1.25rem;flex-wrap:wrap;margin-top:1.25rem;}
.meta-row span{font-size:.8rem;color:rgba(255,255,255,.75);}
.page-header-img{width:100%;max-height:380px;object-fit:cover;display:block;}

/* TOPIC GRID */
.section{padding:3rem 0;}
.section-label{font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:1.5px;color:var(--teal);margin-bottom:.5rem;}
.section-title{font-size:clamp(1.4rem,3vw,1.9rem);color:var(--navy);margin-bottom:.75rem;}
.section-sub{color:var(--muted);max-width:580px;margin-bottom:2rem;}
.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem;margin:2rem 0;}
.topic-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:1.75rem;box-shadow:var(--shadow);transition:box-shadow .2s,border-color .2s;text-decoration:none;display:block;}
.topic-card:hover{box-shadow:var(--shadow-md);border-color:var(--teal);text-decoration:none;}
.topic-icon{font-size:2.25rem;margin-bottom:1rem;display:block;}
.topic-card h3{font-size:1.05rem;color:var(--navy);margin:0 0 .5rem;}
.topic-card p{font-size:.88rem;color:var(--muted);margin:0;line-height:1.5;}
.article-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1.25rem;margin:1.5rem 0;}
.article-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem 1.5rem;box-shadow:var(--shadow);transition:border-color .2s;text-decoration:none;display:flex;flex-direction:column;gap:.4rem;}
.article-card:hover{border-color:var(--teal);text-decoration:none;}
.article-tag{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--teal);}
.article-card h3{font-size:.93rem;color:var(--navy);margin:0;line-height:1.4;}
.article-card .text-muted{font-size:.82rem;color:var(--muted);margin:0;}

/* CALLOUTS */
.callout{background:var(--teal-light);border-left:4px solid var(--teal);border-radius:0 var(--radius) var(--radius) 0;padding:1.1rem 1.25rem;margin:1.5rem 0;}
.callout-label{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--teal);margin-bottom:.4rem;}
.callout p{margin:0;font-size:.93rem;}
.callout.warning{background:#fffbeb;border-color:#f59e0b;}
.callout.warning .callout-label{color:#b45309;}
.callout.info{background:#eff6ff;border-color:#60a5fa;}
.callout.info .callout-label{color:#1d4ed8;}
.quick-answer{background:var(--teal-light);border:1px solid #99f6e4;border-radius:var(--radius);padding:1.25rem 1.5rem;margin-bottom:2rem;}
.qa-label{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--teal);margin-bottom:.5rem;}
.quick-answer p{margin:0;font-size:.95rem;}
.toc{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem 1.5rem;margin-bottom:2rem;}
.toc-title{font-size:.82rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--muted);margin-bottom:.75rem;}
.toc ol{margin:0;padding-left:1.25rem;}
.toc li{font-size:.9rem;margin-bottom:.3rem;}
.toc a{color:var(--teal);}

/* TABLES */
.comp-table-wrap{overflow-x:auto;margin:1.5rem 0;border-radius:var(--radius);box-shadow:var(--shadow);}
table{width:100%;border-collapse:collapse;background:#fff;}
thead{background:var(--navy);}
thead th{color:#fff;font-size:.82rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;padding:.85rem 1rem;text-align:left;}
tbody tr{border-bottom:1px solid var(--border);}
tbody tr:last-child{border:none;}
tbody tr:hover{background:var(--bg);}
td,th{padding:.8rem 1rem;font-size:.9rem;vertical-align:middle;}
td.td-name{font-weight:700;color:var(--navy);}
.best-row{background:#f0fdfa;}
.check{color:#16a34a;font-weight:700;}
.cross{color:#dc2626;font-weight:700;}
.pill{background:var(--teal);color:#fff;font-size:.75rem;font-weight:700;padding:.2rem .6rem;border-radius:99px;}

/* PROS CONS */
.pros-cons{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem;margin:1.5rem 0;}
@media(max-width:560px){.pros-cons{grid-template-columns:1fr;}}
.pros,.cons{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;}
.pros{border-top:3px solid #16a34a;}
.cons{border-top:3px solid #dc2626;}
.pros-label,.cons-label{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;margin-bottom:.75rem;}
.pros-label{color:#16a34a;}
.cons-label{color:#dc2626;}
.pros ul,.cons ul{padding-left:1.25rem;margin:0;}
.pros li,.cons li{font-size:.88rem;margin-bottom:.4rem;}

/* SCORES */
.score-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin:1.5rem 0;}
.score-item{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:1rem;text-align:center;box-shadow:var(--shadow);}
.score-num{font-family:'Nunito Sans',sans-serif;font-size:2rem;font-weight:900;color:var(--teal);line-height:1;}
.score-label{font-size:.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);margin-top:.25rem;}

/* REVIEW CARD */
.review-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-md);margin:1.5rem 0;}
.review-card-header{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;background:var(--navy);color:#fff;}
.review-card-title{font-family:'Nunito Sans',sans-serif;font-weight:800;font-size:1rem;}
.review-card-badge{background:var(--teal);color:#fff;font-size:.72rem;font-weight:700;padding:.2rem .7rem;border-radius:99px;}
.review-card-body{padding:1.5rem;}
.stars{color:#f59e0b;font-size:1.1rem;}
.rating-score{font-weight:700;color:var(--navy);margin-left:.4rem;}
.review-card-footer{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;background:var(--bg);border-top:1px solid var(--border);gap:1rem;flex-wrap:wrap;}
.price-tag{font-weight:700;color:var(--navy);}
.review-header-grid{display:grid;grid-template-columns:240px 1fr;gap:1.5rem;margin:1.5rem 0 2rem;align-items:start;}
@media(max-width:560px){.review-header-grid{grid-template-columns:1fr;}}
.product-hero-img{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;display:flex;align-items:center;justify-content:center;padding:1rem;}
.product-hero-img img{max-width:100%;max-height:220px;object-fit:contain;}

/* CHW CARD */
.chw-card{background:linear-gradient(135deg,#1e40af,#1d4ed8);border-radius:var(--radius);padding:2rem;margin:2rem 0;color:#fff;text-align:center;}
.chw-card h3{color:#fff;font-size:1.3rem;margin:0 0 .5rem;}
.chw-card p{color:rgba(255,255,255,.85);margin-bottom:1.5rem;}
.chw-badge{display:inline-block;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.3);border-radius:99px;font-size:.78rem;font-weight:700;letter-spacing:.5px;padding:.3rem 1rem;margin-bottom:1.25rem;}
.btn-chw{display:inline-flex;align-items:center;justify-content:center;background:#fff;color:#1d4ed8;font-weight:800;font-size:.9rem;letter-spacing:.5px;text-transform:uppercase;text-decoration:none;padding:.85rem 2rem;border-radius:8px;}
.btn-chw:hover{background:#eff6ff;text-decoration:none;}

/* STEPS */
.how-to-use{display:flex;flex-direction:column;gap:1rem;margin:1.5rem 0;}
.how-step{display:flex;gap:1rem;align-items:flex-start;background:#fff;border:1px solid var(--border);border-radius:8px;padding:1.1rem 1.25rem;transition:border-color .2s;}
.how-step:hover{border-color:var(--teal);}
.how-step-num{font-family:'Nunito Sans',sans-serif;font-size:2rem;font-weight:900;color:var(--teal);line-height:1;flex-shrink:0;width:2.25rem;text-align:center;}
.how-step-body{flex:1;min-width:0;}
.how-step-body strong{display:block;color:var(--navy);font-size:.95rem;font-weight:700;margin-bottom:.35rem;}
.how-step-body span{display:block;font-size:.88rem;color:var(--muted);line-height:1.6;}

/* FAQ */
.faq-list{margin:1.5rem 0;}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:.75rem;background:#fff;overflow:hidden;}
.faq-q{width:100%;background:none;border:none;cursor:pointer;text-align:left;padding:1rem 1.25rem;font-family:'Nunito Sans',sans-serif;font-size:.95rem;font-weight:700;color:var(--navy);display:flex;justify-content:space-between;align-items:center;gap:1rem;}
.faq-q:hover{background:var(--bg);}
.faq-q.open{color:var(--teal);background:var(--teal-light);}
.faq-icon{font-size:1.2rem;color:var(--teal);flex-shrink:0;}
.faq-a{display:none;padding:0 1.25rem 1rem;font-size:.9rem;color:var(--text);}
.faq-a.open{display:block;}
.faq-a p:last-child{margin:0;}

/* SIDEBAR */
.sidebar{position:sticky;top:80px;display:flex;flex-direction:column;gap:1.25rem;}
.sidebar-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;box-shadow:var(--shadow);}
.sidebar-title{font-family:'Nunito Sans',sans-serif;font-size:.8rem;font-weight:800;text-transform:uppercase;letter-spacing:1px;color:var(--muted);margin-bottom:.85rem;}
.sidebar-link-list{list-style:none;padding:0;margin:0;}
.sidebar-link-list li{border-bottom:1px solid var(--border);}
.sidebar-link-list li:last-child{border:none;}
.sidebar-link-list a{display:block;padding:.55rem 0;font-size:.88rem;color:var(--teal);font-weight:500;}
.sidebar-link-list a:hover{color:var(--teal-dark);text-decoration:none;}
.sidebar-chw{background:linear-gradient(135deg,#1e3a8a,#1d4ed8);border-radius:var(--radius);padding:1.25rem;}
.sidebar-chw .sidebar-title{color:rgba(255,255,255,.7);}
.sidebar-chw p{font-size:.85rem;color:rgba(255,255,255,.85);margin-bottom:1rem;}

/* CTA */
.cta-banner{background:var(--navy);color:#fff;text-align:center;padding:4rem 1.5rem;}
.cta-banner h2{color:#fff;font-size:clamp(1.5rem,3vw,2.25rem);margin-bottom:.75rem;}
.cta-banner p{color:rgba(255,255,255,.75);max-width:520px;margin:0 auto 2rem;}

/* FOOTER */
footer{background:var(--navy);color:rgba(255,255,255,.7);}
.footer-inner{max-width:1100px;margin:0 auto;padding:2.5rem 1.5rem;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1.5rem;}
.footer-logo{font-family:'Nunito Sans',sans-serif;font-weight:900;font-size:1.1rem;color:#fff;}
.footer-logo span{color:var(--teal);}
.footer-links{display:flex;gap:1.25rem;flex-wrap:wrap;}
.footer-links a{font-size:.82rem;color:rgba(255,255,255,.6);text-decoration:none;}
.footer-links a:hover{color:var(--teal);}
.footer-disc{max-width:1100px;margin:0 auto;padding:.75rem 1.5rem 1.5rem;font-size:.75rem;color:rgba(255,255,255,.45);border-top:1px solid rgba(255,255,255,.08);}