/* Shared styles for industry and tank-problem guide pages (data-center-tanks, leaking-bolted-tank-seams, fbe-coating-failure, reline-or-replace-bolted-tank). Base layout matches water-wastewater-treatment.html. */
:root{--navy:#1b2d4f;--deep:#11203d;--orange:#e76f3c;--gold:#d4a437;--ink:#0e1729;--muted:#5f6878;--line:#d9d5cc;--paper:#fff;--bone:#f7f5f1}
*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,system-ui,sans-serif;color:var(--ink);line-height:1.6;background:var(--paper)}a{text-decoration:none;color:inherit}img{max-width:100%;width: auto; height: auto; display:block}.container{max-width:1180px;margin:0 auto;padding:0 1.5rem}
.utility{background:var(--deep);color:rgba(255,255,255,.84);font-size:.82rem}.utility .container{display:flex;justify-content:space-between;gap:1rem;padding-top:.55rem;padding-bottom:.55rem}.utility a:hover{color:var(--gold)}
header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;gap:2rem;padding:1rem 0}.logo{display:flex;align-items:center;gap:.8rem}.logo img{height:42px;width:auto}.logo span{font-family:Archivo,sans-serif;font-weight:700;font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);border-left:2px solid var(--line);padding-left:.8rem}.links{display:flex;align-items:center;gap:1.15rem;font-weight:600;font-size:.9rem}.links a{white-space:nowrap}.links a:hover{color:var(--orange)}.cta{background:var(--orange);color:#fff!important;padding:.62rem 1rem;border-radius:4px}.nav-dropdown{position:relative}.nav-drop-toggle{cursor:pointer;display:inline-flex;align-items:center;gap:.3rem;background:none;border:0;font:inherit;color:inherit;padding:0}.nav-drop-toggle:hover{color:var(--orange)}.caret{width:.7rem;height:.7rem;transition:transform .2s}.nav-dropdown:hover .caret,.nav-dropdown:focus-within .caret{transform:rotate(180deg)}.nav-dropdown-menu{position:absolute;top:100%;left:0;margin-top:.6rem;min-width:255px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 10px 25px -3px rgba(14,23,41,.12),0 4px 6px -2px rgba(14,23,41,.05);padding:.4rem;display:grid;gap:.1rem;opacity:0;visibility:hidden;transform:translateY(6px);transition:opacity .15s,transform .15s,visibility .15s;z-index:200}.nav-dropdown:hover .nav-dropdown-menu,.nav-dropdown:focus-within .nav-dropdown-menu,.nav-dropdown.open .nav-dropdown-menu{opacity:1;visibility:visible;transform:translateY(0)}.nav-dropdown.open .caret{transform:rotate(180deg)}.mobile-toggle{display:none;background:var(--navy);border:0;cursor:pointer;padding:.5rem .55rem;border-radius:8px;line-height:0;box-shadow:0 2px 8px rgba(14,23,41,.28)}.mobile-toggle svg{width:26px;height:26px;color:#fff}.nav-dropdown-menu a{display:block;padding:.55rem .85rem;border-radius:5px;color:var(--ink);font-weight:600}.nav-dropdown-menu a:hover{background:rgba(231,111,60,.08);color:var(--orange)}
.hero{background:linear-gradient(135deg,var(--deep),var(--navy));color:#fff;padding:5.5rem 0}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:3rem;align-items:center}.eyebrow{font-family:Archivo,sans-serif;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);font-weight:800;font-size:.76rem;margin-bottom:1rem}.hero h1{font-family:Archivo,sans-serif;font-size:clamp(2.4rem,5vw,4.8rem);line-height:1.02;letter-spacing:-.02em;margin-bottom:1.3rem}.lead{font-size:1.13rem;color:rgba(255,255,255,.8);max-width:650px}.hero-actions{display:flex;gap:1rem;flex-wrap:wrap;margin-top:2rem}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.9rem 1.2rem;border-radius:4px;font-weight:800}.btn-primary{background:var(--orange);color:#fff}.btn-secondary{border:1px solid rgba(255,255,255,.35);color:#fff}.photo{border-radius:6px;overflow:hidden;border:1px solid rgba(255,255,255,.16);box-shadow:0 24px 60px rgba(0,0,0,.28)}.photo img{width:100%;height:390px;object-fit:cover}
section{padding:4.8rem 0}.section-head{max-width:760px;margin-bottom:2rem}.section-head h2{font-family:Archivo,sans-serif;font-size:clamp(2rem,3.5vw,3.2rem);line-height:1.06;color:var(--navy);margin-bottom:.8rem}.section-head p{color:var(--muted);font-size:1.05rem}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.card{border:1px solid var(--line);border-radius:6px;padding:1.4rem;background:#fff}.card h3{font-family:Archivo,sans-serif;color:var(--navy);font-size:1.15rem;margin-bottom:.55rem}.card p{color:var(--muted);font-size:.95rem}.band{background:var(--bone);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.split{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}.list{display:grid;gap:.8rem}.item{border-left:3px solid var(--orange);padding:.15rem 0 .15rem 1rem}.item strong{display:block;color:var(--navy);font-family:Archivo,sans-serif}.item span{color:var(--muted);font-size:.94rem}
footer{background:var(--deep);color:rgba(255,255,255,.72);padding:3rem 0 1.5rem}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:2rem}.footer-grid h5{font-family:Archivo,sans-serif;color:var(--gold);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;margin-bottom:.8rem}.footer-grid ul{list-style:none}.footer-grid li{margin:.4rem 0}.footer-grid a:hover{color:var(--orange)}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:2rem;padding-top:1rem;font-size:.78rem;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}
@media(max-width:900px){.hero-grid,.split,.grid,.footer-grid{grid-template-columns:1fr}.photo img{height:300px}.utility .container{flex-direction:column;gap:.2rem}.links{position:fixed;inset:0 0 0 auto;width:min(320px,82vw);flex-direction:column;align-items:flex-start;gap:.4rem;background:var(--paper);padding:6rem 1.75rem 2rem;box-shadow:0 25px 50px -12px rgba(14,23,41,.25);transform:translateX(110%);transition:transform .28s ease;z-index:120;overflow-y:auto}.links.open{transform:translateX(0)}.links a{font-size:1.05rem;padding:.6rem 0;width:100%;border-bottom:1px solid var(--line)}.cta{margin-top:.75rem;width:100%;text-align:center;border-bottom:0!important}.nav-dropdown{width:100%}.nav-drop-toggle{font-size:1.05rem;padding:.6rem 0;width:100%;border-bottom:1px solid var(--line);justify-content:space-between}.nav-dropdown-menu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;border-left:2px solid var(--line);border-radius:0;margin:.25rem 0 .5rem .4rem;padding:0 0 0 .6rem;min-width:0}.nav-dropdown-menu a{border-bottom:0}.mobile-toggle{display:block;z-index:130}.nav-scrim{position:fixed;inset:0;background:rgba(14,23,41,.45);opacity:0;pointer-events:none;transition:opacity .28s;z-index:99}.nav-scrim.open{opacity:1;pointer-events:auto}}
.nav-dropdown-menu.nav-menu-grouped{min-width:288px;padding:.5rem}
.nav-menu-grouped .nav-group{display:grid;gap:.05rem;padding:.3rem 0}
.nav-menu-grouped .nav-group+.nav-group{border-top:1px solid var(--line,#E5E3DC);margin-top:.15rem;padding-top:.45rem}
.nav-menu-grouped .nav-group-head{display:block;padding:.38rem .8rem .28rem;font-family:'Archivo',sans-serif;font-weight:800;font-size:.69rem;letter-spacing:.13em;text-transform:uppercase;color:var(--navy,#1B2D4F)}
.nav-menu-grouped a.nav-group-head:hover{color:var(--orange,#E76F3C);background:transparent}
.nav-menu-grouped .nav-group a:not(.nav-group-head){padding:.4rem .8rem .4rem 1.35rem;font-size:.875rem;font-weight:600}
/* Persistent click-to-call, mobile only. */
.nav-tel{display:none;align-items:center;gap:.4rem;margin-left:auto;margin-right:.55rem;padding:.48rem .75rem;border-radius:6px;background:var(--navy,#1B2D4F);color:#fff!important;font-family:'Archivo',sans-serif;font-weight:700;font-size:.85rem;white-space:nowrap;line-height:1}
.nav-tel:hover{background:var(--navy-deep,#112039);color:#fff!important}
.nav-tel svg{width:15px;height:15px;flex:none}
@media(max-width:900px){
  .nav-tel{display:inline-flex}
  .nav-menu-grouped .nav-group-head{padding:.55rem .35rem .3rem;font-size:.68rem}
  .nav-menu-grouped .nav-group a:not(.nav-group-head){padding:.6rem .5rem .6rem .9rem;font-size:.98rem}
  .nav-menu-grouped .nav-group+.nav-group{margin-top:.3rem;padding-top:.5rem}
}
@media(max-width:400px){.nav-tel .nav-tel-num{display:none}.nav-tel{padding:.48rem .6rem;margin-right:.45rem}}
  footer.home-footer { background:#0E1729; color:rgba(255,255,255,0.65); padding:4rem 0 2rem; }
  footer.home-footer .container { max-width:1320px; margin:0 auto; padding:0 1.5rem; }
  footer.home-footer .footer-grid { display:grid; grid-template-columns:1.5fr repeat(3,1fr); gap:3rem; margin-bottom:3rem; }
  @media (max-width:900px){ footer.home-footer .footer-grid{ grid-template-columns:1fr 1fr; } }
  @media (max-width:500px){ footer.home-footer .footer-grid{ grid-template-columns:1fr; } }
  footer.home-footer .footer-brand p { margin-top:1rem; line-height:1.6; font-size:0.9rem; max-width:360px; }
  footer.home-footer .footer-col h5 { color:#fff; font-family:'Archivo',sans-serif; font-size:0.85rem; letter-spacing:0.08em; text-transform:uppercase; margin-bottom:1.25rem; }
  footer.home-footer .footer-col ul { list-style:none; margin:0; padding:0; }
  footer.home-footer .footer-col li { margin-bottom:0.65rem; }
  footer.home-footer .footer-col a { color:rgba(255,255,255,0.65); font-size:0.9rem; text-decoration:none; transition:color 0.15s; }
  footer.home-footer .footer-col a:hover { color:#E76F3C; }
  footer.home-footer .footer-bottom { border-top:1px solid rgba(255,255,255,0.1); padding-top:1.5rem; display:flex; justify-content:space-between; align-items:center; font-size:0.82rem; gap:1rem; flex-wrap:wrap; }

/* ---------- Guide page additions ---------- */
.crumbs{font-size:.82rem;color:rgba(255,255,255,.7);margin-bottom:1.1rem}.crumbs a:hover{color:var(--gold)}.crumbs span{margin:0 .4rem;opacity:.5}
.hero .lead strong{color:#fff}
.answer{background:#fff;border:1px solid var(--line);border-left:4px solid var(--orange);border-radius:6px;padding:1.3rem 1.5rem;margin:0 0 2rem;max-width:900px}
.answer .tag{font-family:Archivo,sans-serif;font-weight:800;font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--orange);margin-bottom:.4rem}
.answer p{color:var(--ink);font-size:1.04rem}
.prose{max-width:820px}.prose p{color:#323b4c;margin:0 0 1rem;font-size:1.02rem}.prose h3{font-family:Archivo,sans-serif;color:var(--navy);font-size:1.3rem;margin:1.8rem 0 .6rem}.prose ul,.prose ol{margin:0 0 1.1rem 1.25rem;color:#323b4c}.prose li{margin:.35rem 0}.prose a,.card a,.faq a,.answer a,.std a{color:var(--orange);font-weight:600}.prose a:hover{text-decoration:underline}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.card .meta{display:block;font-family:Archivo,sans-serif;font-weight:800;font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--orange);margin-bottom:.45rem}
.card ul{margin:.7rem 0 0 1.1rem;color:var(--muted);font-size:.92rem}.card li{margin:.25rem 0}
.card .card-link{display:inline-block;margin-top:.9rem;font-weight:700;color:var(--orange)}
table.spec{width:100%;border-collapse:collapse;font-size:.94rem;background:#fff;border:1px solid var(--line);border-radius:6px;overflow:hidden}
table.spec th,table.spec td{text-align:left;padding:.75rem .9rem;border-bottom:1px solid var(--line);vertical-align:top}
table.spec th{background:var(--navy);color:#fff;font-family:Archivo,sans-serif;font-size:.8rem;letter-spacing:.06em;text-transform:uppercase}
table.spec tr:last-child td{border-bottom:0}table.spec td:first-child{font-weight:700;color:var(--navy)}
.table-wrap{overflow-x:auto}
.figure{margin:1.6rem 0}.figure img{width:100%;height:auto;border-radius:6px;border:1px solid var(--line)}.figure figcaption{font-size:.85rem;color:var(--muted);margin-top:.5rem}
.std{list-style:none;display:grid;gap:.6rem;margin:0;padding:0}.std li{background:#fff;border:1px solid var(--line);border-radius:6px;padding:.8rem 1rem;font-size:.94rem;color:var(--muted)}.std li strong{color:var(--navy);font-family:Archivo,sans-serif;margin-right:.35rem}
.faq{max-width:900px;display:grid;gap:.7rem}.faq details{background:#fff;border:1px solid var(--line);border-radius:6px;padding:1rem 1.2rem}.faq summary{cursor:pointer;font-family:Archivo,sans-serif;font-weight:700;color:var(--navy);font-size:1.05rem;list-style-position:outside}.faq details p{margin-top:.7rem;color:var(--muted)}
.steps{counter-reset:s;list-style:none;margin:0;padding:0;display:grid;gap:.8rem}.steps li{counter-increment:s;position:relative;padding:.2rem 0 .2rem 3rem;color:#323b4c}.steps li::before{content:counter(s,decimal-leading-zero);position:absolute;left:0;top:.1rem;font-family:Archivo,sans-serif;font-weight:900;color:var(--orange);font-size:1.2rem}.steps li strong{color:var(--navy)}
.related{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.related a{display:block;border:1px solid var(--line);border-radius:6px;padding:1.1rem 1.2rem;background:#fff;transition:border-color .15s}.related a:hover{border-color:var(--orange)}.related strong{display:block;font-family:Archivo,sans-serif;color:var(--navy);margin-bottom:.3rem}.related span{color:var(--muted);font-size:.9rem}
.updated{font-size:.82rem;color:var(--muted);margin-top:1.5rem}
.btn-dark{background:var(--navy);color:#fff}.btn-line{border:1px solid var(--navy);color:var(--navy)}
/* Photo review (ends every problem guide) */
.pr{background:linear-gradient(135deg,var(--deep),var(--navy));color:#fff}
.pr-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:3rem;align-items:start}
.pr h2{font-family:Archivo,sans-serif;font-size:clamp(1.9rem,3.2vw,2.9rem);line-height:1.06;margin-bottom:.9rem}.pr h2 em{font-style:normal;color:var(--orange)}
.pr p,.pr li{color:rgba(255,255,255,.82)}.pr ol{margin:1.2rem 0 0 1.2rem;display:grid;gap:.6rem}.pr .fine{font-size:.82rem;color:rgba(255,255,255,.6);margin-top:1.2rem}.pr .fine a{color:var(--gold)}
.pr-card{background:#fff;color:var(--ink);border-radius:8px;padding:1.6rem;display:grid;gap:.85rem;box-shadow:0 24px 60px rgba(0,0,0,.28)}
.pr-card label{display:block;font-weight:600;font-size:.85rem;color:var(--navy);margin-bottom:.25rem}.pr-card .req{color:var(--orange)}
.pr-card input,.pr-card select,.pr-card textarea{width:100%;font:inherit;font-size:.95rem;padding:.6rem .7rem;border:1px solid var(--line);border-radius:4px;background:#fff;color:var(--ink)}
.pr-card input[type=file]{padding:.45rem;font-size:.85rem}
.pr-card .row{display:grid;grid-template-columns:1fr 1fr;gap:.85rem}.pr-card .files{display:grid;grid-template-columns:1fr 1fr;gap:.5rem}
.pr-card .hint{font-size:.8rem;color:var(--muted);margin-top:.3rem}.pr-card .hint a{color:var(--orange)}
.pr-card button{border:0;cursor:pointer;font:inherit;font-weight:800;background:var(--orange);color:#fff;padding:.95rem 1.2rem;border-radius:4px}.pr-card button:disabled{opacity:.6;cursor:wait}
.pr-msg{display:none;padding:.8rem 1rem;border-radius:4px;font-size:.92rem}.pr-msg.visible{display:block}.pr-err{background:#fdecea;color:#8a1c12}.pr-ok{background:#e8f5ec;color:#1d5c30}
@media(max-width:900px){.grid-2,.related,.pr-grid,.pr-card .row{grid-template-columns:1fr}}