/*
Theme Name: SolarMath
Theme URI: https://solarmath.xyz
Author: SolarMath
Description: Clean, minimal theme for SolarMath — very light sky-tinted pages in the site's own brand hue, navy ink, one solid blue accent, slim STATIC header with a hamburger dropdown on mobile, and each calculator front and centre inside one clean white card. Calculator logic and all copy come from the owner-approved SolarMath demo; the presentation follows the owner's clean-design standard (2026-11-04, linealonlinede.com reference): white cards, soft 1px borders, 16px radius, subtle shadow, generous white space, simple sans type, no heavy decoration.
Version: 1.0.3
Text Domain: solarmath
*/
:root{
  --bg:#f3f8fd; --soft:#e9f2fb; --surface:#ffffff;
  --ink:#0a2540; --body:#3d4c61; --muted:#5d6d82;
  --line:#dde8f2; --line2:#c3d5e8;
  --accent:#1d4ed8; --accent-dark:#1740b0; --accent-soft:#eef6fd;
  --amber:#f5a623; --amber-dark:#d97706; --amber-soft:#fdf3e0; --amber-line:#f0dcae;
  --green:#16a34a; --green-ring:rgba(22,163,74,.14);
  --shadow:0 1px 3px rgba(10,37,64,.05),0 10px 28px -14px rgba(10,37,64,.14);
  --r-lg:16px; --r-md:12px; --r-sm:10px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--body);font-family:"Nunito Sans",system-ui,-apple-system,"Segoe UI",sans-serif;font-size:16.5px;line-height:1.65;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:"Poppins","Nunito Sans",system-ui,sans-serif;color:var(--ink);line-height:1.22;margin:0 0 .5em;font-weight:700;letter-spacing:-.01em}
h1{font-size:clamp(1.85rem,4.6vw,2.65rem)}
h2{font-size:clamp(1.4rem,3.2vw,1.9rem);margin-top:1.4em}
h3{font-size:1.15rem;margin-top:1.15em}
p{margin:0 0 1em}
a{color:var(--accent);text-decoration:none;font-weight:700}
a:hover{text-decoration:underline}
.mono{font-family:"IBM Plex Mono",ui-monospace,monospace}
img{max-width:100%;height:auto;display:block}
button{font:inherit;cursor:pointer}
input,select,textarea{font:inherit;color:var(--ink)}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
section{padding:44px 0}
section.alt{background:var(--soft)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ---------- Header — slim, white, STATIC (owner rule: never sticky/fixed; mobile = hamburger dropdown) ---------- */
header.site{position:static;background:#fff;border-bottom:1px solid var(--line)}
.hbar{display:flex;align-items:center;gap:16px;padding:13px 0}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink);line-height:1.1}
.logo:hover{text-decoration:none}
.logo .lname{font-family:"Poppins",sans-serif;font-size:1.38rem;font-weight:800;letter-spacing:-.01em;color:var(--ink)}
.logo .lname b{color:var(--accent);font-weight:800}
.logo small{display:block;font-family:"Nunito Sans",sans-serif;font-size:.68rem;font-weight:700;letter-spacing:.04em;color:var(--muted)}
.logo-mark{width:32px;height:32px;flex:none}
.custom-logo-link{display:flex;align-items:center;line-height:0}
.custom-logo{height:40px;width:auto;max-width:250px;display:block}
nav.main{display:flex;gap:2px;margin-left:auto;align-items:center}
nav.main ul{display:flex;gap:2px;list-style:none;margin:0;padding:0;align-items:center}
nav.main a{color:var(--body);font-weight:700;font-size:.95rem;padding:8px 12px;border-radius:8px;display:block}
nav.main a:hover{background:var(--accent-soft);color:var(--accent-dark);text-decoration:none}
nav.main li.current-menu-item a,nav.main li.current_page_item a{color:var(--accent-dark);background:var(--accent-soft)}
nav.main a.cta,nav.main a.nav-cta{background:var(--accent);color:#fff}
nav.main a.cta:hover,nav.main a.nav-cta:hover{background:var(--accent-dark);color:#fff}
#menu-toggle{display:none;margin-left:auto;background:#fff;border:1px solid var(--line2);color:var(--ink);width:42px;height:42px;border-radius:10px;font-size:1.15rem;line-height:1;align-items:center;justify-content:center}
@media (max-width:760px){
  #menu-toggle{display:inline-flex}
  nav.main{display:none;position:static;width:100%;margin:0;padding:6px 0 14px}
  nav.main.open{display:block}
  .hbar{flex-wrap:wrap}
  nav.main ul{flex-direction:column;align-items:stretch;gap:2px}
  nav.main a{padding:11px 12px;border:1px solid var(--line);background:#fff}
  nav.main li+li{margin-top:4px}
}

/* ---------- Page furniture ---------- */
.crumb,.crumbs{font-size:.86rem;color:var(--muted);padding:0 0 10px}
.crumbs{padding-top:20px}
.crumb a,.crumbs a{color:var(--muted);font-weight:600}
.crumbs b{color:var(--ink);font-weight:700}
.page-hero{padding:36px 0 4px}
.page-hero h1{margin:8px 0 10px;max-width:20em}
.page-hero h1 em,.hero h1 em{font-style:normal;color:var(--accent)}
.page-hero p{font-size:1.1rem;max-width:44em;margin:0}
.pagehead{max-width:820px;padding:22px 0 4px}
.pagehead h1{margin:8px 0 10px}
.pagehead .lead{font-size:1.13rem;color:var(--body);margin:0;max-width:40em}
.tag{display:inline-block;font-size:.72rem;font-weight:800;letter-spacing:.07em;text-transform:uppercase;padding:4px 11px;border-radius:999px;background:var(--accent-soft);color:var(--accent-dark)}
.sec-head{max-width:46em;margin-bottom:26px}
.sec-head h2{margin-top:10px}
.sec-head p{font-size:1.05rem;margin:0}
.note,.fineprint{font-size:.84rem;color:var(--muted)}
.post-thumbnail img{border-radius:var(--r-lg);border:1px solid var(--line);margin:20px 0 6px}
.screen-reader-text{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- Home hero ---------- */
.hero{padding:38px 0 14px;background:linear-gradient(180deg,#e7f1fc 0%,var(--bg) 88%)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:34px;align-items:start}
.hero h1{margin:12px 0 14px}
.hero .lead{font-size:1.13rem;margin:0 0 18px}
.hero-points{list-style:none;margin:0 0 6px;padding:0;display:grid;gap:14px}
.hero-points li{display:flex;gap:12px;align-items:flex-start}
.hero-points .tick{flex:none;width:24px;height:24px;border-radius:50%;background:var(--green);color:#fff;font-size:.82rem;font-weight:900;display:flex;align-items:center;justify-content:center;margin-top:2px;box-shadow:0 0 0 4px var(--green-ring)}
.hero-stats{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px;align-items:stretch}
.hero-stats>div{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:10px 16px;box-shadow:var(--shadow)}
.hero-stats b{display:block;color:var(--ink);font-size:1.2rem;font-family:"IBM Plex Mono",monospace}
.hero-stats span{font-size:.82rem;color:var(--muted)}
@media (max-width:560px){
  .hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
  .hero-stats>div{min-width:0;padding:10px}
  .hero-stats b{font-size:1.02rem}
  .hero-stats span{font-size:.74rem;line-height:1.35;display:block}
}
@media (max-width:900px){ .hero-grid{grid-template-columns:1fr} }

/* ---------- Buttons & inputs ---------- */
.btn{display:inline-block;background:var(--accent);color:#fff;font-weight:800;padding:12px 22px;border-radius:10px;border:1px solid var(--accent);cursor:pointer;font-size:1rem;font-family:inherit}
.btn:hover{background:var(--accent-dark);border-color:var(--accent-dark);text-decoration:none}
.btn.ghost{background:#fff;color:var(--accent-dark);border:1px solid var(--line2)}
.btn.ghost:hover{border-color:var(--accent);background:var(--accent-soft)}
.f-field label{display:block;font-weight:700;color:var(--ink);font-size:.92rem;margin:0 0 6px}
.f-field{min-width:0}
.f-field .hint{display:block;font-weight:600;color:var(--muted);font-size:.82rem;line-height:1.45;margin:6px 0 0}
.f-input{display:flex;align-items:center;border:1px solid var(--line2);border-radius:var(--r-sm);background:#fff;overflow:hidden}
.f-input input{border:0;flex:1;min-width:0;padding:12px 10px;background:#fff;width:100%}
.f-input .pre,.f-input .post{padding:0 4px 0 12px;color:var(--muted);font-weight:700;flex:none}
.f-input .post{padding:0 12px 0 4px}
.f-input:focus-within{outline:2px solid var(--accent);outline-offset:0;border-color:var(--accent)}
.f-field select,.f-field>input{width:100%;padding:12px 14px;border:1px solid var(--line2);border-radius:var(--r-sm);background:#fff}
.f-field select:focus,.f-field>input:focus{outline:2px solid var(--accent);border-color:var(--accent)}

/* ---------- Calculator — ONE clean white card ---------- */
.calc-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow);padding:28px;margin:0}
.calc-card-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:18px}
.calc-card-head h2,.calc-card-head h3{margin:0;font-size:1.25rem}
.calc-card-head span{color:var(--muted);font-size:.85rem;font-weight:700;flex:none}
.f-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.f-field.f-full{grid-column:1/-1}
.result-band{background:var(--accent-soft);border-top:3px solid var(--amber);border-radius:var(--r-md);padding:18px 20px;margin-top:20px}
.net-label{font-size:.78rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.net{font-family:"IBM Plex Mono",monospace;font-size:clamp(1.9rem,5.5vw,2.6rem);font-weight:700;color:var(--ink);line-height:1.15;margin:2px 0}
.net-sub{font-size:.94rem;color:var(--body)}
.annual-strip{display:grid;grid-template-columns:1fr 1fr;gap:10px 18px;margin-top:16px;border-top:1px solid var(--line);padding-top:14px}
.annual-strip span{display:block;font-size:.8rem;color:var(--muted);font-weight:700}
.annual-strip b{font-family:"IBM Plex Mono",monospace;color:var(--ink);font-size:1.02rem}
.break-rows{margin-top:14px}
.break-row{display:flex;justify-content:space-between;gap:14px;padding:8px 2px;border-bottom:1px dashed var(--line);font-size:.95rem}
.break-row:last-child{border-bottom:0}
.break-row .dot{display:inline-block;width:9px;height:9px;border-radius:50%;margin-right:8px}
.break-row .amt{font-family:"IBM Plex Mono",monospace;font-weight:600;color:var(--ink);white-space:nowrap}
table.plain{width:100%;border-collapse:collapse;margin-top:14px;font-size:.94rem}
table.plain td,table.plain th{padding:8px 6px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
table.plain td.r,table.plain th.r{text-align:right;font-family:"IBM Plex Mono",monospace;white-space:nowrap}
.tscroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.mini-result{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow);padding:24px 26px}
.mini-result h4{margin:0 0 6px;font-size:1rem}
.big-num{font-family:"IBM Plex Mono",monospace;font-size:clamp(1.7rem,4.5vw,2.2rem);font-weight:700;color:var(--accent-dark);line-height:1.15}
.tool-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:26px;align-items:start;margin:24px 0 8px}
.seg{display:inline-flex;border:1px solid var(--line2);border-radius:var(--r-sm);overflow:hidden;background:#fff}
.seg button{border:0;background:#fff;color:var(--body);font-weight:700;padding:10px 16px}
.seg button.on{background:var(--accent);color:#fff}
.chart-box{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}
.chart-box h4{margin:0 0 8px;font-size:.92rem}
.chart-box svg{width:100%;height:auto;display:block}
@media (max-width:900px){ .tool-grid{grid-template-columns:1fr} }
@media (max-width:640px){ .f-grid{grid-template-columns:1fr} .calc-card{padding:22px} .annual-strip{grid-template-columns:1fr 1fr} }

/* ---------- Bands, notes, editorial blocks ---------- */
.alert-band{background:var(--amber-soft);border:1px solid var(--amber-line);border-radius:var(--r-md);padding:16px 18px;color:var(--ink);font-size:.97rem}
.alert-band a{color:var(--accent-dark)}
.tool-note{background:var(--accent-soft);border:1px solid var(--line);border-radius:var(--r-md);padding:16px 18px;font-size:.95rem}
.tool-ed{max-width:46em;margin-top:30px}
.tool-ed h3{font-size:1.35rem}
.formula{font-family:"IBM Plex Mono",monospace;font-size:.92rem;background:var(--accent-soft);border-left:3px solid var(--accent);border-radius:8px;padding:12px 14px;margin:14px 0;color:var(--ink);overflow-x:auto}
.ex{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:16px 18px;margin:14px 0;box-shadow:var(--shadow)}
.tool-ed dl dt{font-weight:800;color:var(--ink);margin-top:12px}
.tool-ed dl dd{margin:2px 0 0}
.disc{font-size:.86rem;color:var(--muted);border-top:1px solid var(--line);padding-top:12px;margin-top:20px}
.tool-visual{margin:26px 0}
.tool-visual img{border-radius:var(--r-lg);border:1px solid var(--line);width:100%}
.tool-visual figcaption{font-size:.86rem;color:var(--muted);margin-top:8px}
.keep-reading{max-width:46em;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow);padding:22px 24px;margin:26px 0}
.keep-reading h3{margin-top:0}

/* ---------- Cards & grids ---------- */
.tool-cards,.guide-grid,.method-grid,.state-notes{display:grid;gap:18px;margin:26px 0}
.tool-cards{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.guide-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.method-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.state-notes{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.tool-card,.guide-card,.method-card,.state-note{border:1px solid var(--line);border-radius:var(--r-lg);padding:22px;background:#fff;box-shadow:var(--shadow)}
.guide-card{padding:0;overflow:hidden;display:flex;flex-direction:column}
.guide-card .gthumb{aspect-ratio:16/9;object-fit:cover;width:100%}
.guide-card h3,.guide-card p,.guide-card .gcat,.guide-card .readbtn,.guide-card .guide-meta{margin-left:20px;margin-right:20px}
.guide-card .gcat{margin-top:16px}
.guide-card h3{margin-top:6px}
.guide-card h3 a{color:var(--ink)}
.guide-card p{font-size:.94rem;flex:1}
.guide-card .guide-meta{font-size:.8rem;color:var(--muted);margin-bottom:18px}
.tcat,.gcat{font-size:.72rem;font-weight:800;letter-spacing:.07em;text-transform:uppercase;color:var(--accent-dark)}
.tmeta{font-family:"IBM Plex Mono",monospace;font-size:.8rem;color:var(--muted);margin:10px 0}
.state-note .srate{display:block;font-family:"IBM Plex Mono",monospace;font-size:.85rem;color:var(--amber-dark);font-weight:600;margin:2px 0 8px}
.method-card h3{margin-top:0}
.check-list{list-style:none;padding:0;margin:0 0 1em;display:grid;gap:9px}
.check-list li{padding-left:28px;position:relative}
.check-list li::before{content:"✓";position:absolute;left:0;top:0;width:20px;height:20px;border-radius:50%;background:var(--green);color:#fff;font-size:.75rem;font-weight:900;display:flex;align-items:center;justify-content:center}
.about-grid{display:grid;grid-template-columns:1.55fr 1fr;gap:30px;align-items:start}
@media (max-width:900px){ .about-grid{grid-template-columns:1fr} }

/* ---------- FAQ ---------- */
.faq{display:grid;gap:10px;max-width:52em}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);box-shadow:var(--shadow)}
.faq-item .q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:14px;background:none;border:0;padding:16px 18px;font-weight:700;color:var(--ink);text-align:left;font-size:1rem}
.faq-item .chev{color:var(--accent);font-weight:900;flex:none}
.faq-item .a{display:none;padding:0 18px 16px;font-size:.97rem}
.faq-item.open .a{display:block}

/* ---------- Article / prose ---------- */
.article,.prose{max-width:46em}
.article p,.article li,.prose p,.prose li{font-size:1.02rem}
.article h2:first-child,.prose h2:first-child{margin-top:0}
.article-fig{margin:26px 0}
.article-fig img{border-radius:var(--r-lg);width:100%;border:1px solid var(--line)}
.article-fig figcaption{font-size:.86rem;color:var(--muted);margin-top:8px}
.callout{border-radius:var(--r-lg);padding:20px 22px;margin:22px 0;background:var(--accent-soft);border:1px solid var(--line)}
.callout p{margin:0}
.a-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:30px 0 6px}
.a-nav a{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:14px 16px;box-shadow:var(--shadow);display:block}
.a-nav a span{display:block;font-size:.78rem;font-weight:800;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.a-nav a b{color:var(--ink)}
@media (max-width:640px){ .a-nav{grid-template-columns:1fr} }
.byline{display:flex;gap:10px;align-items:center;color:var(--muted);font-size:.9rem;margin:10px 0 20px;flex-wrap:wrap}
.avatar{width:42px;height:42px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;flex:none;font-family:"Poppins",sans-serif}
.article-head{max-width:820px;padding-top:8px}
.article-head h1{margin:8px 0 12px}
.alignleft{float:left;margin:4px 16px 10px 0}
.alignright{float:right;margin:4px 0 10px 16px}
.aligncenter{display:block;margin-left:auto;margin-right:auto}
.wp-caption{max-width:100%}

/* ---------- Blog cards ---------- */
.blog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;margin:26px 0}
.post-card{border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;background:#fff;box-shadow:var(--shadow);display:flex;flex-direction:column;padding:0}
.post-card .post-thumb{aspect-ratio:16/9;object-fit:cover;width:100%}
.post-card .pad{padding:18px 20px 20px;display:flex;flex-direction:column;gap:6px;flex:1}
.post-card h3{margin:0;font-size:1.2rem}
.post-card h3 a{color:var(--ink)}
.post-card p{font-size:.94rem;flex:1}
.post-meta{font-size:.82rem;color:var(--muted)}
.pagination{margin:22px 0 50px}
.pagination .nav-links{display:flex;gap:8px;flex-wrap:wrap;margin:0}
.pagination a,.pagination span{background:#fff;border:1px solid var(--line);border-radius:10px;padding:8px 14px;color:var(--ink);font-weight:700;font-size:14px;text-decoration:none}
.pagination .current{background:var(--accent);border-color:var(--accent);color:#fff}

/* ---------- Footer — light, minimal ---------- */
footer.site{background:#fff;border-top:1px solid var(--line);color:var(--body);margin-top:60px;padding:44px 0 28px}
footer.site h4{color:var(--ink);margin:0 0 12px;font-size:1rem}
footer.site a{color:var(--body);font-weight:600;display:block;padding:3px 0}
footer.site a:hover{color:var(--accent-dark)}
footer.site .flogo{color:var(--ink);font-size:1.25rem;font-weight:800;display:flex;gap:9px;align-items:center;font-family:"Poppins",sans-serif}
footer.site p{font-size:.92rem;max-width:30em}
.fgrid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:28px}
.fbottom{border-top:1px solid var(--line);margin-top:30px;padding-top:18px;font-size:.85rem;color:var(--muted);display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}
.fbottom a{display:inline;padding:0}
.toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%) translateY(80px);background:var(--accent-dark);color:#fff;padding:12px 22px;border-radius:999px;font-weight:700;opacity:0;transition:.3s;z-index:99;box-shadow:var(--shadow);pointer-events:none}
.toast.show{transform:translateX(-50%);opacity:1}
@media (max-width:900px){ footer.site .fgrid{grid-template-columns:1fr 1fr} }
@media (max-width:560px){ footer.site .fgrid{grid-template-columns:1fr} body{font-size:16px} section{padding:32px 0} }
@media (prefers-reduced-motion: reduce){ html{scroll-behavior:auto} .toast{transition:none} }