/* TankAndFin: freshwater aquarium theme */
:root{
 --body-font:'Nunito Sans',system-ui,sans-serif;--head-font:'Nunito','Nunito Sans',sans-serif;--head-track:-.3px;
 --bg:#eef8f7;--ink:#173a3c;--head:#0d2e33;--muted:#4f6e70;--link:#0f7f83;
 --accent:#ff6f4e;--accent-dk:#e9532f;--accent2:#14a3a0;--on-accent:#fff;--accent-shadow:rgba(255,111,78,.3);
 --kicker:#b8f3ef;--hero-muted:#d6f4f2;--art-shadow:rgba(4,40,52,.45);
 --header-bg:rgba(255,255,255,.88);--header-border:1px solid #d3ecea;--header-ink:#0d2e33;--nav-hover:#dff4f2;
 --btn-line:#fff;--btn-line-ink:#0d4a55;--btn-radius:999px;
 --trust-bg:#fff;--trust-border:0;--chip-bg:#dff4f2;--chip-ink:#0f7f83;
 --card-bg:#fff;--card-border:1px solid #d3ecea;--radius:22px;--thumb-bg:#fff;--thumb-border:0;
 --shadow:0 20px 40px rgba(15,111,124,.18);--shadow-sm:0 6px 18px rgba(15,111,124,.09);
 --tag:#0f7f83;--vs-bg:#e2f4f2;
 --band-bg:linear-gradient(180deg,#0f6f7c,#0a4656);--band-ink:#d6f4f2;--band-head:#fff;--band-muted:#bfe7e4;--method-bg:rgba(255,255,255,.08);--method-border:1px solid rgba(255,255,255,.16);--method-ic-bg:rgba(255,255,255,.14);--method-ic-ink:#fff;
 --hub-bg:linear-gradient(160deg,#25aeb3 0%,#0f6f7c 55%,#0a4656 100%);--hub-ink:#e9fbff;--hub-head:#fff;--hub-muted:#d6f4f2;--hub-ic-bg:rgba(255,255,255,.16);--hub-ic-ink:#fff;
 --panel-bg:#fff;--panel-border:1px solid #d3ecea;
 --qa-bg:linear-gradient(135deg,#e3f7f5,#fff);--qa-border:1px solid #c7ebe7;--qa-accent:#0f7f83;
 --safety-bg:#fff1ec;--safety-accent:#e9532f;
 --table-bg:#fff;--table-line:1px solid #e1f1ef;--th-bg:#0f6f7c;--th-ink:#fff;--zebra:#f6fbfb;
 --badge-bg:#ffe3c7;--badge-ink:#8a3a13;
 --footer-bg:#0a3442;--footer-ink:#bfe0df;--footer-head:#fff;--footer-link:#e9fbff;--footer-line:rgba(255,255,255,.14);--footer-muted:#86b3b4;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--body-font);color:var(--ink);background:var(--bg);line-height:1.72;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
a{color:var(--link);text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:3px}
img{max-width:100%;display:block}
h1,h2,h3,h4{font-family:var(--head-font);color:var(--head);line-height:1.18;letter-spacing:var(--head-track,-.5px)}
svg{display:block}

/* header */
.site-header{position:sticky;top:0;z-index:40;background:var(--header-bg);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:var(--header-border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:72px;gap:16px;flex-wrap:wrap}
.logo{display:inline-flex;align-items:center;gap:11px;color:var(--header-ink)}.logo:hover{text-decoration:none}
.logo img{height:40px;width:40px}
.logo-word{font-family:var(--logo-font,var(--head-font));font-weight:700;font-size:23px;letter-spacing:-.4px;color:var(--header-ink)}
.logo-word b{color:var(--accent);font-weight:700}.logo-word i{font-style:normal;color:var(--accent2);margin:0 1px}
.main-nav{display:flex;gap:2px;flex-wrap:wrap}
.main-nav a{color:var(--header-ink);font-weight:600;font-size:15px;padding:9px 13px;border-radius:999px;opacity:.92}
.main-nav a:hover{background:var(--nav-hover);text-decoration:none;opacity:1}

.breadcrumb{font-size:13.5px;color:var(--muted);padding:16px 0 0}
.breadcrumb a{color:var(--muted)}.breadcrumb .sep{margin:0 7px;opacity:.55}

/* hero */
.home-hero{position:relative;overflow:hidden;padding:64px 0 70px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero-kicker{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;letter-spacing:1.6px;text-transform:uppercase;color:var(--kicker);margin-bottom:14px}
.hero-kicker:before{content:"";width:26px;height:2px;background:currentColor;display:inline-block}
.home-hero h1{font-size:56px;margin:0 0 18px;letter-spacing:-1.5px}
.home-hero h1 em{font-style:normal;color:var(--accent)}
.home-hero p{font-size:19px;color:var(--hero-muted);max-width:560px;margin:0 0 28px}
.hero-art svg{width:100%;height:auto;filter:drop-shadow(0 30px 50px var(--art-shadow))}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;padding:14px 24px;border-radius:var(--btn-radius,12px);font-size:15.5px;transition:transform .15s,box-shadow .15s,background .15s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-red{background:var(--accent);color:var(--on-accent);box-shadow:0 10px 24px var(--accent-shadow)}.btn-red:hover{background:var(--accent-dk)}
.btn-line{border:2px solid var(--btn-line);color:var(--btn-line)}.btn-line:hover{background:var(--btn-line);color:var(--btn-line-ink)}

/* trust strip */
.trust{background:var(--trust-bg);border-top:var(--trust-border);border-bottom:var(--trust-border)}
.trust-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;padding:26px 24px}
.trust-item{display:flex;gap:14px;align-items:flex-start}
.trust-ic{flex:0 0 46px;height:46px;border-radius:14px;display:flex;align-items:center;justify-content:center;background:var(--chip-bg);color:var(--chip-ink)}
.trust-item b{display:block;font-family:var(--head-font);font-size:16.5px;color:var(--head);margin-bottom:2px}
.trust-item span{font-size:14px;color:var(--muted);line-height:1.5}

/* sections + cards */
.section{padding:52px 0}
.section h2{font-size:34px;margin:0 0 6px}
.section .lede,.lede{color:var(--muted);margin:0 0 26px;font-size:17px}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(258px,1fr));gap:22px}
.card{position:relative;background:var(--card-bg);border:var(--card-border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);color:var(--ink);display:flex;flex-direction:column;transition:transform .18s,box-shadow .18s}
.card:hover{text-decoration:none;box-shadow:var(--shadow);transform:translateY(-4px)}
.card-thumb{background:var(--thumb-bg);height:200px;display:flex;align-items:center;justify-content:center;padding:18px;border-bottom:var(--thumb-border)}
.card-thumb img{max-height:100%;max-width:100%;object-fit:contain;mix-blend-mode:multiply}
.card-body{padding:16px 18px 20px}
.card-tag{display:inline-flex;align-items:center;gap:6px;font-size:11.5px;font-weight:700;letter-spacing:1.2px;text-transform:uppercase;color:var(--tag)}
.ct-ic svg{width:15px;height:15px}
.card-title{font-family:var(--head-font);font-weight:700;font-size:19px;line-height:1.28;margin:6px 0 6px;color:var(--head)}
.card-desc{font-size:14.5px;color:var(--muted);margin:0;line-height:1.55}

.vs-band{background:var(--vs-bg)}
.more-list{columns:2;column-gap:32px;padding-left:20px}.more-list li{break-inside:avoid;margin:6px 0}
.method-band{background:var(--band-bg);color:var(--band-ink);padding:56px 0;position:relative;overflow:hidden}
.method-band h2{color:var(--band-head);font-size:34px;margin:0}
.method-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:20px;margin-top:24px;position:relative}
.method{background:var(--method-bg);border:var(--method-border);border-radius:var(--radius);padding:22px}
.method-ic{width:50px;height:50px;border-radius:14px;display:flex;align-items:center;justify-content:center;background:var(--method-ic-bg);color:var(--method-ic-ink);margin-bottom:12px}
.method-ic svg{width:26px;height:26px}
.method h3{color:var(--band-head);margin:0 0 6px;font-size:20px}
.method h3 a{color:inherit}
.method p{margin:0;color:var(--band-muted);font-size:14.5px}

/* hub */
.hub-hero{background:var(--hub-bg);color:var(--hub-ink);padding:44px 0 46px;position:relative;overflow:hidden;margin-top:14px}
.hub-hero-in{display:flex;gap:26px;align-items:center;position:relative}
.hub-ic{flex:0 0 86px;height:86px;border-radius:24px;display:flex;align-items:center;justify-content:center;background:var(--hub-ic-bg);color:var(--hub-ic-ink)}
.hub-ic svg{width:46px;height:46px}
.hub-hero h1{font-size:44px;margin:2px 0 8px;color:var(--hub-head)}
.hub-hero .lede{color:var(--hub-muted);margin:0;max-width:760px}
.hub-intro{background:var(--panel-bg);border:var(--panel-border);border-radius:var(--radius);padding:20px 24px;margin:0 0 30px;font-size:16.5px}
.hub-intro p{margin:0}
.section > h2,.hub-h2{margin-top:30px}

/* article */
.post{max-width:800px;margin:0 auto;padding:6px 0 48px}
.post-head{padding:18px 0 4px;position:relative}
.post-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:1.4px;text-transform:uppercase;color:var(--tag);background:var(--chip-bg);padding:6px 12px 6px 8px;border-radius:999px}
.eb-ic svg{width:17px;height:17px}
.post h1{font-size:44px;letter-spacing:-1px;margin:14px 0 10px}
.post-meta{color:var(--muted);font-size:14px}
.post-body{font-size:18px}
.post-body h2{font-size:29px;margin:44px 0 12px;padding-top:6px}
.post-body h3{font-size:21px;margin:28px 0 8px}
.post-body ul,.post-body ol{padding-left:22px}
.post-body li{margin:6px 0}
.post-body li::marker{color:var(--accent)}
.affiliate-note{font-size:13.5px;color:var(--muted);background:var(--panel-bg);border:var(--panel-border);border-radius:12px;padding:10px 14px}
.quick-answer{background:var(--qa-bg);border:var(--qa-border);border-left:6px solid var(--qa-accent);border-radius:16px;padding:20px 22px;margin:24px 0;box-shadow:var(--shadow-sm)}
.quick-answer strong:first-child{display:block;font-family:var(--head-font);font-size:13px;letter-spacing:1.4px;text-transform:uppercase;margin-bottom:6px;color:var(--qa-accent)}
.safety{background:var(--safety-bg);border-left:6px solid var(--safety-accent);border-radius:16px;padding:18px 20px;margin:24px 0}
.safety strong:first-child{color:var(--safety-accent)}
.post-hero{margin:22px 0 8px;background:var(--thumb-bg);border:var(--card-border);border-radius:var(--radius);padding:22px;display:flex;justify-content:center;box-shadow:var(--shadow-sm)}
.post-hero img{max-height:340px;object-fit:contain;mix-blend-mode:multiply}
.table-wrap{overflow-x:auto;margin:20px 0;border-radius:14px;box-shadow:var(--shadow-sm)}
table{width:100%;border-collapse:collapse;font-size:15px;background:var(--table-bg);overflow:hidden}
.table-wrap table{margin:0}
th,td{padding:11px 13px;border-bottom:var(--table-line);text-align:left;vertical-align:top}
th{background:var(--th-bg);color:var(--th-ink);font-weight:700;font-size:14px}
tr:nth-child(even) td{background:var(--zebra)}

.product-card{display:grid;grid-template-columns:180px 1fr;gap:22px;background:var(--card-bg);border:var(--card-border);border-radius:var(--radius);padding:20px;margin:22px 0;box-shadow:var(--shadow-sm);position:relative}
.product-card > a:first-child{background:var(--thumb-bg);border-radius:12px;display:flex;align-items:center;justify-content:center;padding:8px}
.pc-img{width:164px;height:164px;object-fit:contain;mix-blend-mode:multiply}
.pc-badge{display:inline-block;background:var(--badge-bg);color:var(--badge-ink);font-size:12px;font-weight:700;padding:4px 11px;border-radius:999px;letter-spacing:.2px}
.pc-title{font-family:var(--head-font);font-size:21px;margin:10px 0 6px;color:var(--head)}
.product-card ul{margin:6px 0 14px;padding-left:20px;font-size:15.5px}
.btn-amazon{display:inline-block;background:var(--accent);color:var(--on-accent);font-weight:700;padding:11px 20px;border-radius:var(--btn-radius,11px);font-size:15px;box-shadow:0 8px 18px var(--accent-shadow)}
.btn-amazon:hover{background:var(--accent-dk);text-decoration:none}
.sources{font-size:14.5px;background:var(--panel-bg);border:var(--panel-border);border-radius:14px;padding:16px 20px;margin-top:34px}
.sources h2{font-size:19px;margin:0 0 6px}
.sources ol{margin:0;padding-left:20px}
.related{margin-top:30px;background:var(--panel-bg);border:var(--panel-border);border-radius:14px;padding:16px 22px}
.related h2{font-size:21px;margin:4px 0 6px}
.related ul{padding-left:20px}
.caveat{color:var(--muted)}

/* footer */
.site-footer{background:var(--footer-bg);color:var(--footer-ink);padding:48px 0 28px;margin-top:56px;font-size:14.5px;position:relative}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}
.site-footer h4{color:var(--footer-head);font-size:16px;margin:0 0 10px}
.site-footer a{color:var(--footer-link)}
.site-footer ul{list-style:none;margin:0;padding:0}.site-footer li{margin:5px 0}
.footer-legal{border-top:1px solid var(--footer-line);margin-top:26px;padding-top:16px;font-size:13px;color:var(--footer-muted)}

@media (max-width:900px){.hero-grid{grid-template-columns:1fr;gap:28px}.hero-art{max-width:520px;margin:0 auto}.trust-grid{grid-template-columns:1fr}}
@media (max-width:720px){
 .home-hero{padding:40px 0 46px}.home-hero h1{font-size:38px}.post h1{font-size:32px}.post-body{font-size:16.5px}
 .hub-hero h1{font-size:32px}.hub-ic{flex-basis:62px;height:62px}.hub-ic svg{width:34px;height:34px}
 .product-card{grid-template-columns:1fr}.pc-img{width:100%;height:200px}
 .footer-grid{grid-template-columns:1fr}.more-list{columns:1}
 .post-hero img{max-height:200px}.site-header{position:static}
 .main-nav a{font-size:14px;padding:6px 9px}
}

/* skin */
/* TankAndFin: freshwater aquarium theme */
.home-hero{background:linear-gradient(180deg,#2bb7bc 0%,#128a93 45%,#0a4f62 100%);color:#fff;padding-bottom:110px}
.home-hero:before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 12% 70%,rgba(255,255,255,.18) 0 6px,transparent 7px),radial-gradient(circle at 16% 55%,rgba(255,255,255,.14) 0 4px,transparent 5px),radial-gradient(circle at 46% 85%,rgba(255,255,255,.14) 0 5px,transparent 6px),radial-gradient(circle at 52% 30%,rgba(255,255,255,.12) 0 3px,transparent 4px);pointer-events:none}
.home-hero:after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:70px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 70' preserveAspectRatio='none'%3E%3Cpath d='M0 40 C 240 0 480 70 720 40 C 960 10 1200 70 1440 30 L1440 70 L0 70Z' fill='%23eef8f7'/%3E%3C/svg%3E") no-repeat bottom/100% 70px}
.home-hero h1{color:#fff;font-weight:900}
.home-hero h1 em{color:#ffd29a}
.hero-art{position:relative;z-index:1}
.trust{margin-top:-46px;position:relative;z-index:2;background:transparent}
.trust-grid{background:#fff;border-radius:24px;box-shadow:0 16px 40px rgba(15,111,124,.14);padding:26px 28px}
.card{border-top:5px solid #2bb7bc}
.card--equipment{border-top-color:#ff8a5c}.card--water{border-top-color:#3c8cff}.card--learn{border-top-color:#2e9b4f}
.card-title{font-weight:800}
.method-band:after{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 90% 20%,rgba(255,255,255,.12) 0 8px,transparent 9px),radial-gradient(circle at 94% 40%,rgba(255,255,255,.1) 0 5px,transparent 6px),radial-gradient(circle at 6% 80%,rgba(255,255,255,.1) 0 6px,transparent 7px);pointer-events:none}
.hub-hero{padding-bottom:70px}
.hub-hero:after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:44px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 44' preserveAspectRatio='none'%3E%3Cpath d='M0 24 C 360 0 720 44 1080 20 C 1260 8 1350 30 1440 18 L1440 44 L0 44Z' fill='%23eef8f7'/%3E%3C/svg%3E") no-repeat bottom/100% 44px}
.post-head{background:linear-gradient(135deg,#dff4f2,#fff);border-radius:24px;padding:26px 28px 22px;margin-top:14px;border:1px solid #d3ecea}
.post-head h1{font-weight:900}
.post-body h2{font-weight:800}
.post-body h2:before{content:"";display:block;width:44px;height:5px;border-radius:5px;background:linear-gradient(90deg,#2bb7bc,#ff8a5c);margin-bottom:12px}
.btn-red{font-weight:800}
.site-footer:before{content:"";position:absolute;left:0;right:0;top:-40px;height:42px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 42' preserveAspectRatio='none'%3E%3Cpath d='M0 20 C 360 44 720 0 1080 22 C 1260 34 1350 16 1440 24 L1440 42 L0 42Z' fill='%230a3442'/%3E%3C/svg%3E") no-repeat top/100% 42px}