/* Balcony Sun Lab · navy, solar yellow and warm paper */
:root{
  --navy-900:#0b1a33;--navy-800:#102445;--navy-700:#13294b;--navy-600:#24467d;--navy-200:#cdd8ea;--navy-100:#e5ecf6;--navy-50:#f2f6fb;
  --sun-700:#9a6a00;--sun-600:#c88a00;--sun-500:#f6b40e;--sun-400:#ffc83d;--sun-100:#fff0c7;--sun-50:#fff9e8;
  --green-700:#17663f;--green-500:#2f9e5f;--green-100:#d9f2e3;
  --paper:#fbfaf6;--sand:#f3efe5;
  --ink:#121a2b;--ink-2:#37405a;--muted:#646c80;--line:#e6e2d8;--line-2:#d6d0c2;
  --bg:#ffffff;
  --radius:18px;--radius-sm:12px;--max:1180px;
  --shadow-sm:0 1px 2px rgba(11,26,51,.06),0 1px 3px rgba(11,26,51,.05);
  --shadow:0 2px 6px rgba(11,26,51,.05),0 14px 34px rgba(11,26,51,.09);
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  /* map status colours */
  --st-inforce:#2f9e5f;--st-signed:#8fd0a8;--st-passed:#ffc83d;--st-bill:#f3dfb4;--st-none:#e1e4ea;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font:16.5px/1.7 var(--sans);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:var(--navy-600);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--sun-700)}
svg{flex-shrink:0}
h1,h2,h3{font-family:var(--sans);font-weight:800;letter-spacing:-.02em;line-height:1.18;color:var(--ink)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.narrow{max-width:780px}
.page-wide{max-width:1000px}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:8px;z-index:20}
.ico{display:inline-block;vertical-align:middle}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--navy-700);color:#fff;text-decoration:none;padding:12px 20px;border-radius:12px;font-weight:700;font-size:.97rem;line-height:1.2;border:2px solid transparent;transition:transform .15s,background .15s,box-shadow .15s;cursor:pointer;font-family:inherit}
.btn:hover{background:var(--navy-800);color:#fff;transform:translateY(-1px)}
.btn-accent{background:var(--sun-500);color:var(--navy-900)}
.btn-accent:hover{background:var(--sun-400);color:var(--navy-900);box-shadow:0 8px 20px rgba(246,180,14,.35)}
.btn-outline{background:transparent;color:var(--navy-700);border-color:var(--navy-700)}
.btn-outline:hover{background:var(--navy-700);color:#fff}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-weight:700;text-decoration:none}
.link-arrow svg{transition:transform .15s}
.link-arrow:hover svg{transform:translateX(3px)}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.95);backdrop-filter:saturate(1.6) blur(10px);-webkit-backdrop-filter:saturate(1.6) blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;height:68px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:1.22rem;letter-spacing:-.02em;color:var(--ink);text-decoration:none;white-space:nowrap}
.brand b{color:var(--sun-600);font-weight:800}
.brand:hover{color:var(--ink)}
.logo{width:34px;height:34px;display:block}
.menu{display:flex;align-items:center;gap:6px}
.menu ul{display:flex;gap:0;list-style:none;margin:0;padding:0}
.menu ul a{display:block;padding:8px 11px;border-radius:10px;color:var(--ink-2);text-decoration:none;font-size:.92rem;font-weight:600;white-space:nowrap;position:relative}
.menu ul a:hover{color:var(--navy-700);background:var(--navy-50)}
.menu ul a[aria-current]{color:var(--navy-700)}
.menu ul a[aria-current]::after{content:"";position:absolute;left:11px;right:11px;bottom:2px;height:3px;border-radius:2px;background:var(--sun-500)}
.nav-cta{display:inline-flex;align-items:center;gap:6px;margin-left:6px;padding:9px 14px;border-radius:10px;background:var(--navy-700);color:#fff;font-weight:700;font-size:.92rem;text-decoration:none;white-space:nowrap}
.nav-cta:hover{background:var(--sun-500);color:var(--navy-900)}
.menu-btn{display:none;width:42px;height:42px;border:1px solid var(--line);background:#fff;border-radius:12px;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:4px;padding:0}
.menu-btn span{display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;transition:transform .2s,opacity .2s}
.menu-btn.open span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.menu-btn.open span:nth-child(2){opacity:0}
.menu-btn.open span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
@media (max-width:1100px){
  .menu-btn{display:flex}
  .menu{display:none;position:absolute;left:0;right:0;top:68px;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow);padding:12px 20px 20px;flex-direction:column;align-items:stretch}
  .menu.open{display:flex}
  .menu ul{flex-direction:column}
  .menu ul a{padding:12px 14px;font-size:1rem}
  .menu ul a[aria-current]{background:var(--navy-50)}
  .menu ul a[aria-current]::after{display:none}
  .nav-cta{margin:8px 0 0;justify-content:center;padding:12px}
}

/* ---------- topic tones ---------- */
.tone-laws{background:var(--navy-100);color:var(--navy-700)}
.tone-kits{background:var(--sun-100);color:var(--sun-700)}
.tone-savings{background:var(--green-100);color:var(--green-700)}
.tone-renters{background:#fde4dc;color:#a2402a}
.tone-install{background:#e6e3f7;color:#4d3f99}
.tone-uk{background:#e1eef6;color:#1d5f80}
.tone-bg-laws{--tone:var(--navy-100)}.tone-bg-kits{--tone:var(--sun-100)}.tone-bg-savings{--tone:var(--green-100)}
.tone-bg-renters{--tone:#fde4dc}.tone-bg-install{--tone:#e6e3f7}.tone-bg-uk{--tone:#e1eef6}

/* ---------- home ---------- */
.hero{background:var(--paper);border-bottom:1px solid var(--line);position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;right:-160px;top:-200px;width:560px;height:560px;border-radius:50%;background:radial-gradient(circle,rgba(246,180,14,.22),transparent 65%)}
.hero-inner{position:relative;display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center;padding-top:56px;padding-bottom:64px}
.eyebrow{display:inline-flex;align-items:center;gap:6px;margin:0 0 18px;padding:6px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--sun-700);font-size:.78rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase}
.hero h1{font-size:clamp(2.2rem,4.8vw,3.4rem);line-height:1.06;margin:0 0 18px;letter-spacing:-.035em;color:var(--navy-900)}
.hero .hl{background:linear-gradient(transparent 62%,var(--sun-400) 62%);padding:0 2px}
.hero-lead{font-size:1.12rem;color:var(--ink-2);max-width:560px;margin:0 0 22px}
.hero-uk{margin:12px 0 18px;font-size:.95rem}
.hero-uk a{font-weight:650}
.hero-points{display:flex;flex-wrap:wrap;gap:8px 22px;list-style:none;padding:0;margin:0;color:var(--ink-2);font-size:.92rem}
.hero-points li{display:inline-flex;align-items:center;gap:7px}
.hero-points svg{color:var(--green-500)}
.hero-map{background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px;box-shadow:var(--shadow)}
@media (max-width:940px){.hero-inner{grid-template-columns:1fr;gap:32px;padding-top:40px;padding-bottom:48px}}

.state-pick{display:flex;flex-direction:column;gap:6px;max-width:420px}
.state-pick span{font-weight:700;font-size:.9rem}
.state-pick select{width:100%;padding:14px 16px;border:2px solid var(--navy-700);border-radius:14px;font:inherit;font-size:1.05rem;background:#fff;color:var(--ink);cursor:pointer}
.state-pick select:focus{outline:none;box-shadow:0 0 0 4px var(--sun-100)}

/* state map */
.state-map{margin:0}
.state-map svg{width:100%;height:auto;display:block}
.tile rect{fill:var(--st-none);transition:opacity .15s}
.tile text{font:700 13px var(--sans);fill:var(--ink-2);pointer-events:none}
.tile:hover rect,.tile:focus rect{opacity:.75;stroke:var(--navy-700);stroke-width:2}
.st-inforce rect,.sw.st-inforce,.badge.st-inforce{fill:var(--st-inforce);background:var(--st-inforce)}
.tile.st-inforce text{fill:#fff}
.st-signed rect,.sw.st-signed,.badge.st-signed{fill:var(--st-signed);background:var(--st-signed)}
.st-passed rect,.sw.st-passed,.badge.st-passed{fill:var(--st-passed);background:var(--st-passed)}
.st-bill rect,.sw.st-bill,.badge.st-bill{fill:var(--st-bill);background:var(--st-bill)}
.st-none rect,.sw.st-none,.badge.st-none{fill:var(--st-none);background:var(--st-none)}
.badge.st-inforce{color:#fff}
.legend{display:flex;flex-wrap:wrap;gap:6px 16px;list-style:none;padding:0;margin:14px 0 6px;font-size:.82rem;color:var(--ink-2)}
.legend li{display:inline-flex;align-items:center;gap:6px}
.sw{display:inline-block;width:14px;height:14px;border-radius:4px}
.map-note{display:block;font-size:.8rem;color:var(--muted);line-height:1.5}
.badge{display:inline-block;padding:3px 9px;border-radius:999px;font-size:.76rem;font-weight:700;white-space:nowrap;color:var(--ink)}
.narrow-map{max-width:760px}
.prose .state-map{margin:1.4em 0 1.8em;padding:18px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow-sm)}
.state-table td:first-child{white-space:nowrap}
.state-table tr:target{outline:3px solid var(--sun-500);outline-offset:-3px}

/* updates */
.two-col{display:grid;grid-template-columns:1.3fr 1fr;gap:40px;align-items:start}
@media (max-width:900px){.two-col{grid-template-columns:1fr}}
.updates{list-style:none;margin:0;padding:0;border-left:3px solid var(--sun-500)}
.updates li{position:relative;padding:0 0 18px 22px}
.updates li::before{content:"";position:absolute;left:-8px;top:6px;width:13px;height:13px;border-radius:50%;background:#fff;border:3px solid var(--sun-500)}
.updates time{display:block;font-size:.8rem;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--sun-700)}
.updates a{color:var(--ink);text-decoration:none;font-weight:600}
.updates a:hover{color:var(--navy-600);text-decoration:underline}
.calc-teaser{background:var(--navy-700);color:#fff;border-radius:22px;padding:30px;box-shadow:0 24px 50px rgba(11,26,51,.22)}
.calc-teaser h2{color:#fff;margin:14px 0 8px;font-size:1.5rem}
.calc-teaser p{color:rgba(255,255,255,.8);margin:0 0 20px}
.calc-teaser .tool-ico{background:rgba(255,255,255,.1);border-color:transparent;color:var(--sun-400)}

/* ---------- sections ---------- */
.section{padding:60px 0}
.section + .section{padding-top:0}
.band{background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:56px 0}
.section.band{padding:60px 0}
.section.band + .section{padding-top:60px}
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:8px 16px;flex-wrap:wrap;margin-bottom:24px}
.section-head p{margin:0;color:var(--muted)}
.section-title{font-size:clamp(1.45rem,2.6vw,1.9rem);margin:0}
.band > .wrap > .section-title{margin-bottom:20px}

.topics{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.topic{display:flex;flex-direction:column;gap:6px;padding:22px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;text-decoration:none;color:var(--ink);transition:border-color .15s,box-shadow .15s,transform .15s}
.topic:hover{border-color:var(--navy-200);box-shadow:var(--shadow);transform:translateY(-2px);color:var(--ink)}
.topic-icon{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;margin-bottom:8px}
.topic-name{font-weight:800;font-size:1.15rem;line-height:1.25}
.topic-desc{color:var(--muted);font-size:.92rem;line-height:1.5;flex:1}
.topic-count{display:inline-flex;align-items:center;gap:6px;color:var(--navy-600);font-weight:700;font-size:.88rem;margin-top:8px}
@media (max-width:860px){.topics{grid-template-columns:repeat(2,1fr)}}
.tool-ico{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;background:var(--sun-50);color:var(--sun-700);border:1px solid var(--sun-100)}

.cards{display:grid;gap:18px}
.cards-3{grid-template-columns:repeat(3,1fr)}
.cards-4{grid-template-columns:repeat(4,1fr)}
@media (max-width:1000px){.cards-4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:900px){.cards-3{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.cards-3,.cards-4{grid-template-columns:1fr}}
.card{display:flex;flex-direction:column;gap:10px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);text-decoration:none;color:var(--ink);transition:border-color .15s,box-shadow .15s,transform .15s}
.card:hover{border-color:var(--navy-200);box-shadow:var(--shadow);transform:translateY(-2px);color:var(--ink)}
.card-top{display:flex;align-items:center;justify-content:space-between;gap:10px}
.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;font-size:.77rem;font-weight:700;text-decoration:none;line-height:1.4}
.card-time{font-size:.8rem;color:var(--muted);white-space:nowrap}
.card-title{font-weight:800;font-size:1.1rem;line-height:1.3;letter-spacing:-.01em}
.card-desc{color:var(--muted);font-size:.92rem;line-height:1.55;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;flex:1}
.card-more{display:inline-flex;align-items:center;gap:6px;color:var(--navy-600);font-weight:700;font-size:.9rem}
.card-more svg{transition:transform .15s}
.card:hover .card-more svg{transform:translateX(3px)}

.about-strip{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:32px 36px;border-radius:22px;background:var(--navy-50);border:1px solid var(--navy-100)}
.about-strip h2{margin:0 0 6px;font-size:1.4rem}
.about-strip p{margin:0;color:var(--ink-2);max-width:760px}
@media (max-width:700px){.about-strip{flex-direction:column;align-items:flex-start;padding:26px}}

/* ---------- breadcrumbs ---------- */
.crumbs{display:flex;flex-wrap:wrap;gap:6px;font-size:.86rem;color:var(--muted);padding-top:22px}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--navy-600);text-decoration:underline}
.crumbs .sep{color:var(--line-2)}
.crumbs span[aria-current]{color:var(--ink-2);max-width:48ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ---------- hubs and pages ---------- */
.page-hero,.post-hero{background:var(--paper);border-bottom:1px solid var(--line)}
.cat-hero{background:linear-gradient(180deg,var(--tone,var(--paper)) -40%,var(--paper) 70%);border-bottom:1px solid var(--line)}
.cat-hero-inner{display:flex;gap:24px;align-items:flex-start;padding:26px 0 40px;max-width:900px}
.cat-hero-icon{width:66px;height:66px;border-radius:20px;display:grid;place-items:center;box-shadow:var(--shadow-sm)}
.cat-hero h1{font-size:clamp(1.85rem,3.8vw,2.7rem);margin:0 0 12px;line-height:1.12}
.cat-hero .lead{font-size:1.08rem;color:var(--ink-2);max-width:760px}
.cat-hero .lead p{margin:0 0 10px}
.cat-count{font-size:.85rem;font-weight:700;color:var(--muted)}
.cat-guides{padding:44px 0 8px}
.topics-mini{display:flex;flex-wrap:wrap;gap:10px}
.topic-mini{display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border:1px solid var(--line);border-radius:999px;text-decoration:none;color:var(--ink-2);font-weight:650;font-size:.93rem;background:#fff}
.topic-mini:hover{border-color:var(--sun-500);color:var(--sun-700)}
.topic-mini svg{color:var(--navy-600)}
@media (max-width:600px){.cat-hero-inner{flex-direction:column;gap:16px}}
.page-hero h1{font-size:clamp(1.85rem,3.8vw,2.5rem);margin:14px 0 0;padding-bottom:28px}
.page-hero .lead{margin:-12px 0 0;padding-bottom:30px;font-size:1.1rem;color:var(--ink-2)}
.page-meta{margin:-18px 0 0;padding-bottom:26px}
.page-body{padding-top:36px;padding-bottom:40px}
.page-faq{padding-top:0}

/* ---------- article ---------- */
.post-hero-inner{max-width:830px;padding:22px 0 38px}
.kicker{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:0 0 14px}
.pill{display:inline-block;padding:4px 10px;border-radius:999px;background:var(--navy-700);color:#fff;font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.05em}
.post-hero h1{font-size:clamp(1.9rem,4vw,2.75rem);line-height:1.12;margin:0 0 14px}
.post-hero .lead{font-size:1.13rem;color:var(--ink-2);margin:0 0 18px}
.meta{display:flex;flex-wrap:wrap;gap:4px 0;font-size:.88rem;color:var(--muted);margin:0}
.meta span+span::before{content:"·";margin:0 9px;color:var(--line-2)}
@media (max-width:560px){.meta{flex-direction:column}.meta span+span::before{display:none}}
.post-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:60px;padding-top:40px;padding-bottom:56px}
.post{max-width:740px;min-width:0}
@media (max-width:1020px){.post-layout{grid-template-columns:1fr;gap:0}.sidebar{display:none}.post{max-width:none}}

.toc ol{margin:0;padding:0;list-style:none;counter-reset:toc}
.toc li{counter-increment:toc}
.toc a{display:flex;gap:10px;padding:6px 0;color:var(--ink-2);text-decoration:none;font-size:.9rem;line-height:1.4}
.toc a::before{content:counter(toc,decimal-leading-zero);color:var(--sun-600);font-weight:800;font-size:.78rem;padding-top:2px}
.toc a:hover{color:var(--navy-600)}
.toc-mobile{display:none;border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px;margin-bottom:28px;background:var(--paper)}
.toc-mobile summary{display:flex;align-items:center;gap:8px;font-weight:700;cursor:pointer;list-style:none}
.toc-mobile summary::-webkit-details-marker{display:none}
.toc-mobile summary::after{content:"+";margin-left:auto;font-size:1.3rem;color:var(--sun-600)}
.toc-mobile[open] summary::after{content:"−"}
.toc-mobile ol{margin-top:10px}
@media (max-width:1020px){.toc-mobile{display:block}}

.sidebar{position:relative}
.toc-side{position:sticky;top:92px;padding:20px 22px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;margin-bottom:20px;max-height:calc(100vh - 120px);overflow:auto}
.toc-title{margin:0 0 8px;font-size:.78rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.cta-box{padding:22px;border-radius:var(--radius);background:var(--navy-700);color:#fff;margin-bottom:20px}
.cta-box .cta-ico{color:var(--sun-400);margin-bottom:6px}
.cta-title{margin:0 0 4px;font-weight:800;font-size:1.1rem}
.cta-box p{margin:0 0 14px;color:rgba(255,255,255,.8);font-size:.92rem;line-height:1.5}
.cta-box .btn{width:100%;justify-content:center;padding:11px 16px;font-size:.92rem}
.sticky-ad{position:sticky;top:92px}

/* prose */
.prose{font-size:1.06rem;color:var(--ink-2)}
.prose > :first-child{margin-top:0}
.prose p{margin:0 0 1.15em}
.prose h2{font-size:clamp(1.4rem,2.6vw,1.72rem);margin:2em 0 .65em;padding-top:.2em;scroll-margin-top:90px;color:var(--ink)}
.prose h3{font-size:1.18rem;margin:1.6em 0 .5em;color:var(--ink)}
.prose strong{color:var(--ink)}
.prose ul,.prose ol{padding-left:1.3em;margin:0 0 1.2em}
.prose li{margin:.45em 0}
.prose ul li::marker{color:var(--sun-600)}
.prose ol li::marker{color:var(--navy-600);font-weight:700}
.prose blockquote{margin:1.4em 0;padding:4px 0 4px 18px;border-left:3px solid var(--navy-200);color:var(--ink-2);font-style:italic}
.answer{background:var(--navy-50);border:1px solid var(--navy-100);border-left:4px solid var(--navy-700);padding:18px 22px;border-radius:var(--radius-sm);font-size:1.05rem;color:var(--ink)}
.update{background:var(--sun-50);border:1px solid var(--sun-100);border-left:4px solid var(--sun-500);padding:16px 20px;border-radius:var(--radius-sm);font-size:.98rem;color:var(--ink)}
.update::before{content:"Update";display:block;font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--sun-700);margin-bottom:4px}
.tip{background:#f1f8f3;border:1px solid #d6ecdd;border-radius:var(--radius-sm);padding:16px 20px;font-size:.98rem}
.tip::before{content:"Tip";display:block;font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--green-700);margin-bottom:4px}
.warn{background:#fff3f0;border:1px solid #f6d5cc;border-left:4px solid #d9583a;border-radius:var(--radius-sm);padding:16px 20px;font-size:.98rem;color:var(--ink)}
.warn::before{content:"Careful";display:block;font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#a3402a;margin-bottom:4px}
.formula{background:var(--paper);border:1px dashed var(--line-2);border-radius:var(--radius-sm);padding:14px 18px;font-weight:650;color:var(--navy-800);font-size:1rem}
.facts{display:grid;grid-template-columns:repeat(2,1fr);gap:0;margin:1.4em 0 1.8em;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;box-shadow:var(--shadow-sm)}
.facts div{padding:14px 18px;border-bottom:1px solid var(--line)}
.facts div:nth-child(odd){border-right:1px solid var(--line)}
.facts dt{font-size:.75rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:0}
.facts dd{margin:2px 0 0;font-weight:650;color:var(--ink);font-size:1rem;line-height:1.45}
@media (max-width:560px){.facts{grid-template-columns:1fr}.facts div:nth-child(odd){border-right:0}}
.steps{counter-reset:step;list-style:none;padding-left:0!important}
.steps > li{counter-increment:step;position:relative;padding-left:46px;margin:0 0 1em}
.steps > li::before{content:counter(step);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--navy-700);color:#fff;font-weight:700;font-size:.9rem;display:grid;place-items:center}
.checklist{list-style:none;padding-left:0!important}
.checklist li{position:relative;padding-left:30px}
.checklist li::before{content:"";position:absolute;left:2px;top:.45em;width:16px;height:16px;border-radius:5px;border:2px solid var(--green-500);background:var(--green-100)}
.model{position:relative;background:#fff;border:1px solid var(--line-2);border-radius:var(--radius-sm);padding:22px 24px 18px;margin:1.2em 0 1.6em;font-family:Georgia,"Times New Roman",serif;font-size:1rem;line-height:1.65;color:var(--ink);box-shadow:var(--shadow-sm);white-space:pre-line}
.model-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:1.4em 0 -.6em}
.model-head strong{font-size:.95rem}
.copy-btn{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;border-radius:10px;border:1px solid var(--line-2);background:#fff;font:600 .85rem var(--sans);color:var(--navy-700);cursor:pointer}
.copy-btn:hover{border-color:var(--navy-600)}
.table-wrap{overflow-x:auto;margin:1.4em 0 1.6em;border:1px solid var(--line);border-radius:var(--radius-sm);box-shadow:var(--shadow-sm)}
table{border-collapse:collapse;width:100%;font-size:.93rem}
th,td{padding:11px 13px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
th{background:var(--navy-700);color:#fff;font-weight:700;font-size:.85rem}
tbody tr:nth-child(even){background:var(--paper)}
tbody tr:last-child td{border-bottom:0}
td{color:var(--ink-2)}

.faq{display:grid;gap:10px}
.faq details{border:1px solid var(--line);border-radius:var(--radius-sm);background:#fff;transition:border-color .15s}
.faq details[open]{border-color:var(--navy-100);background:var(--navy-50)}
.faq summary{display:flex;justify-content:space-between;gap:16px;padding:16px 18px;font-weight:700;color:var(--ink);cursor:pointer;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.3rem;line-height:1;color:var(--sun-600)}
.faq details[open] summary::after{content:"−"}
.faq-a{padding:0 18px 4px}
.faq-a p{margin:0 0 14px}

.note{display:flex;gap:12px;align-items:flex-start;margin-top:40px;padding:16px 18px;border-radius:var(--radius-sm);background:var(--paper);border:1px solid var(--line);font-size:.88rem;color:var(--ink-2);line-height:1.6}
.note svg{color:var(--sun-600);margin-top:2px}
.sources,.changelog{margin-top:24px}
.sources-title{margin:0 0 6px;font-weight:800;font-size:.92rem;color:var(--ink)}
.sources ol{margin:0;padding-left:1.3em;font-size:.88rem;color:var(--muted)}
.sources li{margin:4px 0}
.changelog ul{list-style:none;margin:0;padding:0;font-size:.88rem;color:var(--ink-2)}
.changelog li{margin:4px 0}
.changelog time{font-weight:700;color:var(--sun-700);margin-right:6px}
.author-box{display:flex;gap:16px;align-items:flex-start;margin-top:28px;padding:20px 22px;border:1px solid var(--line);border-radius:var(--radius);font-size:.93rem;color:var(--ink-2)}
.author-box p{margin:0}
.author-name{font-weight:800;color:var(--ink);margin-bottom:4px!important}
.author-rev{margin-top:6px!important;font-weight:700;color:var(--navy-700)}
.author-links{margin-top:6px!important}
.author-avatar .logo{width:44px;height:44px}

/* ---------- ads ---------- */
.ad{margin:32px 0;text-align:center;min-height:100px}
.ad-label{display:block;font-size:.7rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:6px}
.ad-sidebar{min-height:600px;margin:0}

/* ---------- calculator ---------- */
.calc{border:1px solid var(--line);border-radius:22px;padding:28px;background:#fff;box-shadow:var(--shadow);margin:8px 0 36px;font-family:var(--sans)}
.calc-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px 22px}
@media (max-width:640px){.calc-grid{grid-template-columns:1fr}.calc{padding:20px}}
.calc label{display:block;font-weight:700;font-size:.9rem;margin-bottom:6px;color:var(--ink)}
.calc input,.calc select{width:100%;padding:12px 14px;border:1px solid var(--line-2);border-radius:var(--radius-sm);font:inherit;font-size:1rem;background:var(--paper);color:var(--ink);transition:border-color .15s,box-shadow .15s,background .15s}
.calc input:focus,.calc select:focus{outline:none;border-color:var(--navy-600);background:#fff;box-shadow:0 0 0 4px var(--navy-100)}
.calc small{display:block;margin-top:4px;color:var(--muted);font-size:.8rem;line-height:1.45}
.results{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:26px;padding-top:24px;border-top:1px solid var(--line)}
@media (max-width:760px){.results{grid-template-columns:1fr 1fr}}
.result{background:var(--navy-50);border:1px solid var(--navy-100);border-radius:14px;padding:16px}
.result .v{font-size:1.45rem;font-weight:800;color:var(--navy-800);letter-spacing:-.02em;line-height:1.2}
.result .l{font-size:.82rem;color:var(--muted)}
.result-main{background:var(--sun-50);border-color:var(--sun-100)}
.result-main .v{color:var(--sun-700)}
.calc-msg{margin:16px 0 0;font-size:.93rem;color:var(--ink-2)}

/* ---------- footer ---------- */
.site-footer{background:var(--navy-900);color:rgba(255,255,255,.72);padding:56px 0 0;font-size:.93rem}
.site-footer a{color:rgba(255,255,255,.86);text-decoration:none}
.site-footer a:hover{color:var(--sun-400)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1.2fr 1fr;gap:36px}
.footer-about p{max-width:380px;margin:14px 0 0;line-height:1.6}
.brand-footer,.brand-footer:hover{color:#fff}
.brand-footer b{color:var(--sun-400)}
.footer-title{margin:0 0 12px;color:#fff;font-weight:800;font-size:.95rem}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin:8px 0}
.copy{margin-top:44px;padding-top:20px;padding-bottom:24px;border-top:1px solid rgba(255,255,255,.1);font-size:.84rem;color:rgba(255,255,255,.55)}
@media (max-width:900px){.footer-grid{grid-template-columns:1fr 1fr}.footer-about{grid-column:1/-1}}

@media (max-width:560px){
  body{font-size:16px}
  .wrap{padding:0 16px}
  .topic{padding:16px;gap:4px}
  .topic-desc{display:none}
  .brand{font-size:1.08rem}
  .section{padding:44px 0}
  .tile text{font-size:15px}
}