/* solarlighttowerpro.com — light blueprint engineering */
:root{--bg:#F8FAFC;--surface:#FFFFFF;--tech:#EEF3F7;--primary:#1E3A5F;--secondary:#3B82A6;--accent:#F59E0B;--text:#1F2937;--muted:#475569;--line:#D5DFE8;--line-strong:#64748B;--cta:#1E3A5F;--cta-hover:#142C49}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'IBM Plex Sans',Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text);line-height:1.65;font-size:1rem}
.mono{font-family:'IBM Plex Mono',ui-monospace,monospace}
.container{max-width:1280px;margin:0 auto;padding:0 40px}
/* header */
.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{font-weight:600;font-size:1.25rem;color:var(--primary);text-decoration:none;letter-spacing:.04em}
.brand small{display:block;font-size:.68rem;font-weight:400;color:var(--muted);letter-spacing:.14em}
.main-nav{display:flex;gap:28px;align-items:center}
.main-nav a{color:var(--text);text-decoration:none;font-size:.95rem}
.main-nav a:hover{color:var(--primary);text-decoration:underline}
.btn{display:inline-block;background:var(--cta);color:#fff;text-decoration:none;padding:14px 28px;border-radius:2px;font-weight:500;font-size:1rem;border:none;cursor:pointer;min-height:44px}
.btn:hover{background:var(--cta-hover)}
.btn-secondary{display:inline-block;background:transparent;color:var(--primary);border:1px solid var(--primary);text-decoration:none;padding:13px 26px;border-radius:2px;font-weight:500}
.text-link{color:var(--primary);font-weight:500}
/* hero */
.hero{background:var(--surface);border-bottom:1px solid var(--line);padding:64px 0}
.hero-grid{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:start}
.hero h1{font-size:clamp(2.125rem,4.2vw,3.25rem);line-height:1.12;color:var(--primary);margin-bottom:12px}
.config-tag{display:inline-block;font-size:.8rem;letter-spacing:.12em;color:var(--muted);border:1px solid var(--line-strong);padding:4px 12px;margin-bottom:20px}
.spec-summary{width:100%;border-collapse:collapse;margin:20px 0;font-size:.9375rem}
.spec-summary th,.spec-summary td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line)}
.spec-summary th{color:var(--muted);font-weight:500;width:38%}
.spec-summary td{font-family:'IBM Plex Mono',monospace}
.identity-line{color:var(--muted);margin:16px 0 24px}
/* mast datum rail */
.equip-figure{position:relative}
.fig-img{position:relative}
.fig-img img{width:100%;height:auto;display:block;background:var(--tech);border:1px solid var(--line)}
.datum-rail{position:absolute;top:0;bottom:0;right:-4px;width:0;border-right:2px solid var(--secondary)}
.datum-label{position:absolute;right:12px;font-family:'IBM Plex Mono',monospace;font-size:.8rem;color:var(--primary);background:var(--surface);border:1px solid var(--secondary);padding:2px 8px;white-space:nowrap}
.dl{position:absolute;border-top:1px solid var(--secondary)}
.figure-caption{font-size:.85rem;color:var(--muted);margin-top:8px}
.img-placeholder{width:100%;aspect-ratio:4/3;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;background:#e2e8f0;border:1px solid var(--line);color:var(--muted)}
.img-placeholder span{font-family:'IBM Plex Mono',monospace;font-size:1rem;color:var(--primary)}
.img-placeholder small{font-size:.8rem}
/* sections */
.section{padding:64px 0}
.section.alt{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section h2{font-size:clamp(1.75rem,2.8vw,2.5rem);color:var(--primary);margin-bottom:24px;line-height:1.12}
.section h3{font-size:1.25rem;color:var(--primary);margin:28px 0 12px}
.two-col{display:grid;grid-template-columns:8fr 4fr;gap:48px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.panel{background:var(--surface);border:1px solid var(--line);padding:28px}
.panel h3{margin-top:0}
.panel h3 a{color:var(--primary);text-decoration:none}
/* spec tables */
table.spec{width:100%;border-collapse:collapse;margin:16px 0;font-size:.9375rem}
table.spec th,table.spec td{text-align:left;padding:10px 12px;border:1px solid var(--line);vertical-align:top}
table.spec th{background:var(--tech);color:var(--primary);font-weight:600;width:32%}
table.spec td{font-family:'IBM Plex Mono',monospace}
/* content */
.prose{max-width:68ch}
.prose p{margin:0 0 16px}
.prose ul,.prose ol{margin:0 0 16px 24px}
.prose li{margin-bottom:8px}
.prose h2{margin:32px 0 16px}
.prose h3{margin:24px 0 12px}
/* breadcrumb */
.crumb{font-size:.85rem;color:var(--muted);margin-bottom:16px}
.crumb a{color:var(--primary)}
/* footer */
.site-footer{background:var(--primary);color:#fff;padding:56px 0 32px;margin-top:0}
.site-footer a{color:#cbd5e1}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;margin-bottom:32px}
.site-footer h4{font-size:1rem;margin-bottom:16px;color:#fff}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:8px;font-size:.9rem}
.footer-bottom{border-top:1px solid rgba(255,255,255,.2);padding-top:24px;font-size:.85rem;color:#cbd5e1;display:flex;justify-content:space-between}
/* forms */
.form-grid{display:grid;grid-template-columns:7fr 5fr;gap:48px}
label{display:block;font-weight:500;margin:16px 0 6px}
input[type=text],input[type=email],textarea,select{width:100%;padding:12px;border:1px solid var(--line-strong);border-radius:2px;font-size:1rem;font-family:inherit}
textarea{min-height:140px}
.form-note{font-size:.85rem;color:var(--muted);margin-top:12px}
/* mobile */
.menu-toggle{display:none;background:none;border:1px solid var(--primary);color:var(--primary);padding:10px 16px;font-size:1rem;border-radius:2px}
@media(max-width:960px){
.container{padding:0 20px}
.hero-grid,.two-col,.form-grid{grid-template-columns:1fr}
.grid-3{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr 1fr}
.main-nav{display:none;position:absolute;top:72px;left:0;right:0;background:var(--surface);flex-direction:column;padding:20px;border-bottom:1px solid var(--line)}
.main-nav.open{display:flex}
.menu-toggle{display:block}
.datum-label{position:static;display:inline-block;margin:4px 4px 4px 0}
.datum-rail{display:none}
.dl{display:none}
}