/* ==========================================================================
   CostToBuild — main stylesheet
   Mobile-first. No framework. Brand: #2563EB, #10B981, #F9FAFB, #111827.
   ========================================================================== */

/* ---------- 1. Design tokens ---------- */
:root {
	--c-primary: #2563EB;
	--c-primary-700: #1D4ED8;
	--c-secondary: #10B981;
	--c-secondary-700: #047857;
	--c-bg: #F9FAFB;
	--c-bg-2: #FFFFFF;
	--c-bg-muted: #F3F4F6;
	--c-text: #111827;
	--c-text-muted: #4B5563;
	--c-text-soft: #6B7280;
	--c-border: #E5E7EB;
	--c-border-strong: #D1D5DB;
	--c-warning: #F59E0B;
	--c-danger: #EF4444;
	--c-link: var(--c-primary);

	--radius: 10px;
	--radius-lg: 16px;
	--shadow-sm: 0 1px 2px rgba(17,24,39,.06), 0 1px 1px rgba(17,24,39,.04);
	--shadow: 0 6px 18px rgba(17,24,39,.08), 0 2px 6px rgba(17,24,39,.04);
	--shadow-lg: 0 12px 32px rgba(17,24,39,.12);

	--ff-body: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Inter", "Helvetica Neue", Arial, sans-serif;
	--ff-display: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Inter", "Helvetica Neue", Arial, sans-serif;

	--container: 1200px;
	--gutter: clamp(16px, 4vw, 32px);

	--head-height: 64px;

	--text-sm: .9rem;
	--text-base: 1rem;
	--text-lg: 1.125rem;
	--text-xl: 1.25rem;
	--text-2xl: 1.5rem;
	--text-3xl: 2rem;
	--text-4xl: 2.5rem;
	--text-5xl: 3.25rem;
}

/* ---------- 2. Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
	margin: 0;
	font-family: var(--ff-body);
	color: var(--c-text);
	background: var(--c-bg);
	line-height: 1.6;
	font-size: 17px;
	-webkit-font-smoothing: antialiased;
}
img, svg, video { max-width: 100%; height: auto; display: block; }
a { color: var(--c-link); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover, a:focus-visible { color: var(--c-primary-700); }
:focus-visible { outline: 3px solid #93C5FD; outline-offset: 2px; border-radius: 4px; }
h1, h2, h3, h4, h5, h6 { font-family: var(--ff-display); line-height: 1.2; margin: 0 0 .5em; color: var(--c-text); }
h1 { font-size: var(--text-4xl); letter-spacing: -0.02em; }
h2 { font-size: var(--text-3xl); margin-top: 1.6em; letter-spacing: -0.01em; }
h3 { font-size: var(--text-xl); margin-top: 1.4em; }
h4 { font-size: var(--text-lg); margin-top: 1.2em; }
p, ul, ol, table, blockquote { margin: 0 0 1em; }
ul, ol { padding-left: 1.4em; }
li + li { margin-top: 0.25em; }
hr { border: 0; border-top: 1px solid var(--c-border); margin: 2em 0; }

button { font: inherit; cursor: pointer; }
input, select, textarea { font: inherit; color: inherit; }

/* ---------- 3. Utilities ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.visually-hidden { position: absolute !important; height: 1px; width: 1px; overflow: hidden; clip: rect(1px,1px,1px,1px); white-space: nowrap; }
.skip-link { position: absolute; top: -100px; left: 0; background: var(--c-primary); color: #fff; padding: 8px 14px; z-index: 100; }
.skip-link:focus { top: 0; }

/* ---------- 4. Buttons ---------- */
.btn {
	display: inline-flex; align-items: center; justify-content: center; gap: .5em;
	padding: .75em 1.25em;
	border-radius: var(--radius);
	font-weight: 600;
	text-decoration: none;
	border: 2px solid transparent;
	transition: background .15s, border-color .15s, color .15s, transform .05s;
	line-height: 1.2;
	white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }
.btn--primary:hover, .btn--primary:focus-visible { background: var(--c-primary-700); border-color: var(--c-primary-700); color: #fff; }
.btn--secondary { background: var(--c-secondary); color: #fff; border-color: var(--c-secondary); }
.btn--secondary:hover, .btn--secondary:focus-visible { background: var(--c-secondary-700); border-color: var(--c-secondary-700); color: #fff; }
.btn--ghost { background: transparent; color: var(--c-text); border-color: var(--c-border-strong); }
.btn--ghost:hover { background: var(--c-bg-muted); }
.btn--large { padding: 1em 1.5em; font-size: var(--text-lg); }
.btn--block { display: flex; width: 100%; }

/* ---------- 5. Header / nav ---------- */
.site-header { position: sticky; top: 0; z-index: 50; background: var(--c-bg-2); border-bottom: 1px solid var(--c-border); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; height: var(--head-height); gap: 16px; }
.site-branding { display: flex; align-items: center; }
.site-logo { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; color: var(--c-text); font-weight: 700; font-size: 1.1rem; }
.site-logo__mark { display: inline-flex; width: 32px; height: 32px; align-items: center; justify-content: center; background: var(--c-primary); color: #fff; border-radius: 8px; font-weight: 800; }
.site-logo__tld { color: var(--c-text-soft); font-weight: 500; }

.nav-toggle {
	display: inline-flex; flex-direction: column; gap: 4px;
	background: transparent; border: 1px solid var(--c-border-strong); padding: 10px;
	border-radius: 8px;
}
.nav-toggle__bar { width: 22px; height: 2px; background: var(--c-text); }

.primary-nav { display: none; }
.primary-nav__list { list-style: none; margin: 0; padding: 0; display: flex; gap: 4px; align-items: center; }
.primary-nav__list a { color: var(--c-text); text-decoration: none; padding: 10px 12px; border-radius: 8px; font-weight: 500; }
.primary-nav__list a:hover, .primary-nav__list a:focus-visible { background: var(--c-bg-muted); }
.primary-nav__cta { margin-left: 8px; }

/* Mega menu */
.has-mega-menu { position: relative; }
.mega-menu {
	display: none;
	position: absolute; left: 50%; top: calc(100% + 10px); transform: translateX(-50%);
	width: min(960px, calc(100vw - 32px));
	background: var(--c-bg-2);
	border: 1px solid var(--c-border);
	border-radius: var(--radius-lg);
	box-shadow: var(--shadow-lg);
	padding: 20px;
	z-index: 60;
}
.has-mega-menu:hover > .mega-menu, .has-mega-menu:focus-within > .mega-menu { display: block; }
.mega-menu__grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.mega-menu__item a { display: flex; align-items: center; gap: 10px; padding: 10px; border-radius: 8px; text-decoration: none; color: var(--c-text); }
.mega-menu__item a:hover { background: var(--c-bg-muted); }
.mega-menu__icon { font-size: 22px; }
.mega-menu__cta { display: flex; align-items: center; justify-content: space-between; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--c-border); }
.mega-menu__all { font-weight: 600; color: var(--c-primary); text-decoration: none; }

/* Mobile drawer */
@media (max-width: 899px) {
	.primary-nav {
		position: fixed; inset: var(--head-height) 0 0 0;
		background: var(--c-bg-2);
		padding: 24px;
		flex-direction: column;
		gap: 12px;
		display: none;
		overflow-y: auto;
		z-index: 49;
	}
	.primary-nav.is-open { display: flex; }
	.primary-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
	.primary-nav__list a { display: block; padding: 14px 12px; border-bottom: 1px solid var(--c-border); border-radius: 0; font-size: var(--text-lg); }
	.primary-nav__cta { margin-top: 12px; }
	.mega-menu { position: static; transform: none; width: 100%; box-shadow: none; border: 0; padding: 0 0 8px; display: none; }
	.has-mega-menu.is-open > .mega-menu { display: block; }
	.mega-menu__grid { grid-template-columns: repeat(2, 1fr); }
	.mega-menu__cta { flex-direction: column; gap: 8px; align-items: stretch; }
}
@media (min-width: 900px) {
	.nav-toggle { display: none; }
	.primary-nav { display: flex; align-items: center; gap: 8px; }
}

/* ---------- 6. Hero ---------- */
.hero { background: linear-gradient(180deg, #EFF6FF 0%, var(--c-bg) 100%); padding: clamp(32px, 6vw, 72px) 0; }
.hero__inner { display: grid; grid-template-columns: 1fr; gap: 32px; align-items: center; }
.hero__title { font-size: clamp(2rem, 5vw, 3.25rem); margin-bottom: .4em; letter-spacing: -0.02em; }
.hero__subtitle { font-size: var(--text-lg); color: var(--c-text-muted); margin-bottom: 1.4em; max-width: 56ch; }
.hero__search { display: flex; gap: 8px; max-width: 560px; }
.hero__search input { flex: 1; padding: 14px 16px; border: 2px solid var(--c-border-strong); border-radius: var(--radius); background: #fff; }
.hero__search input:focus { outline: none; border-color: var(--c-primary); }
.hero__alt { margin-top: 1em; }
.hero__art svg { width: 100%; height: auto; }
@media (min-width: 900px) {
	.hero__inner { grid-template-columns: 1.2fr 1fr; gap: 56px; }
}

/* ---------- 7. Trust bar ---------- */
.trust-bar { background: var(--c-bg-2); border-block: 1px solid var(--c-border); padding: 14px 0; }
.trust-bar__inner { display: flex; flex-wrap: wrap; justify-content: space-around; gap: 16px; font-size: var(--text-sm); color: var(--c-text-muted); }
.trust-bar__item strong { color: var(--c-text); font-weight: 700; }

/* ---------- 8. Section headers ---------- */
.section-header { margin: clamp(28px, 5vw, 56px) 0 24px; }
.section-header h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); margin: 0 0 8px; }
.section-header__lede { color: var(--c-text-muted); font-size: var(--text-lg); }

/* ---------- 9. Category grid (homepage) ---------- */
.category-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
@media (min-width: 700px)  { .category-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; } }
@media (min-width: 1000px) { .category-grid { grid-template-columns: repeat(6, 1fr); gap: 16px; } .category-grid--large { grid-template-columns: repeat(3, 1fr); gap: 20px; } }
.category-card {
	display: flex; flex-direction: column; gap: 4px;
	background: var(--c-bg-2);
	border: 1px solid var(--c-border);
	border-radius: var(--radius);
	padding: 16px;
	text-decoration: none;
	color: var(--c-text);
	transition: transform .12s, box-shadow .12s, border-color .12s;
	min-height: 110px;
}
.category-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--c-primary); }
.category-card__icon { font-size: 28px; }
.category-card__name { font-weight: 600; }
.category-card__from { color: var(--c-text-soft); font-size: var(--text-sm); margin-top: auto; }
.category-card--large { padding: 24px; min-height: 160px; }
.category-card__desc { font-size: var(--text-sm); color: var(--c-text-muted); }

/* ---------- 10. How it works ---------- */
.how-it-works { padding: clamp(32px,6vw,64px) 0; }
.how-list { list-style: none; padding: 0; display: grid; grid-template-columns: 1fr; gap: 20px; counter-reset: how; }
@media (min-width: 700px) { .how-list { grid-template-columns: repeat(3, 1fr); } }
.how-list__item { background: var(--c-bg-2); border: 1px solid var(--c-border); border-radius: var(--radius-lg); padding: 24px; position: relative; }
.how-list__num { display: inline-flex; width: 40px; height: 40px; align-items: center; justify-content: center; background: var(--c-primary); color: #fff; border-radius: 999px; font-weight: 800; margin-bottom: 12px; }

/* ---------- 11. Featured calculators ---------- */
.featured-calcs { padding: clamp(24px,5vw,56px) 0; }
.featured-calcs__grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 700px) { .featured-calcs__grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .featured-calcs__grid { grid-template-columns: repeat(4, 1fr); } }
.featured-calc-card { display: block; background: var(--c-bg-2); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 20px; text-decoration: none; color: var(--c-text); transition: transform .12s, box-shadow .12s; }
.featured-calc-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.featured-calc-card h3 { margin-top: 0; }
.featured-calc-card__cta { display: inline-block; margin-top: 12px; color: var(--c-primary); font-weight: 600; }

/* ---------- 12. Latest posts / cards ---------- */
.latest-posts { padding: clamp(24px,5vw,56px) 0; }
.post-list { display: grid; gap: 24px; }
.post-list--grid { grid-template-columns: 1fr; }
@media (min-width: 700px)  { .post-list--grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .post-list--grid { grid-template-columns: repeat(3, 1fr); } }

.post-card { background: var(--c-bg-2); border: 1px solid var(--c-border); border-radius: var(--radius-lg); overflow: hidden; transition: transform .12s, box-shadow .12s; }
.post-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.post-card__link { display: block; text-decoration: none; color: inherit; }
.post-card__thumb { aspect-ratio: 3/2; overflow: hidden; background: var(--c-bg-muted); }
.post-card__thumb img, .post-card__thumb svg { width: 100%; height: 100%; object-fit: cover; }
.post-card__thumb--svg { display: block; }
.post-card__body { padding: 16px 20px 20px; }
.post-card__title { font-size: var(--text-lg); margin: 0 0 6px; }
.post-card__meta { font-size: var(--text-sm); color: var(--c-text-soft); margin-bottom: 8px; }
.post-card__excerpt { color: var(--c-text-muted); margin: 0; }
.post-card__price { font-weight: 700; color: var(--c-secondary-700); margin: 0 0 6px; }

/* ---------- 13. FAQ accordion ---------- */
.home-faq, .faq-section { padding: clamp(24px,5vw,56px) 0; }
.faq-list { display: flex; flex-direction: column; gap: 8px; max-width: 820px; }
.faq-item { background: var(--c-bg-2); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 0; overflow: hidden; }
.faq-item__q { padding: 16px 20px; font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item__q::-webkit-details-marker { display: none; }
.faq-item__q::after { content: '+'; font-size: 22px; color: var(--c-text-soft); transition: transform .15s; }
.faq-item[open] .faq-item__q::after { transform: rotate(45deg); }
.faq-item__a { padding: 0 20px 20px; color: var(--c-text-muted); }

/* ---------- 14. Newsletter band ---------- */
.newsletter-band { background: linear-gradient(135deg, var(--c-primary) 0%, #1E40AF 100%); color: #fff; padding: clamp(32px,5vw,56px) 0; margin-top: 64px; }
.newsletter-band__inner { display: grid; gap: 24px; }
.newsletter-band h2 { color: #fff; margin: 0; }
.newsletter-band__copy p { margin: 0; opacity: 0.9; }
.newsletter-form { display: grid; gap: 8px; }
.newsletter-form input { padding: 14px 16px; border-radius: var(--radius); border: 0; }
.newsletter-form__note { font-size: var(--text-sm); opacity: 0.8; margin: 0; }
@media (min-width: 800px) {
	.newsletter-band__inner { grid-template-columns: 1fr 1fr; align-items: center; gap: 48px; }
	.newsletter-form { grid-template-columns: 1fr auto; align-items: start; gap: 8px; }
	.newsletter-form__note { grid-column: 1 / -1; }
}

/* ---------- 15. Footer ---------- */
.site-footer { background: #0F172A; color: #E5E7EB; padding: 56px 0 24px; }
.site-footer a { color: #E5E7EB; text-decoration: none; }
.site-footer a:hover { color: #fff; text-decoration: underline; }
.site-footer__columns { display: grid; gap: 32px; grid-template-columns: 1fr; }
@media (min-width: 600px) { .site-footer__columns { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .site-footer__columns { grid-template-columns: repeat(4, 1fr); } }
.footer-col__title { color: #fff; font-size: var(--text-base); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 0.08em; }
.footer-col__list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.site-footer__bottom { border-top: 1px solid #1F2937; margin-top: 40px; padding-top: 24px; font-size: var(--text-sm); color: #9CA3AF; }

/* ---------- 16. Cookie banner ---------- */
.cookie-banner { position: fixed; bottom: 16px; left: 16px; right: 16px; background: var(--c-bg-2); border: 1px solid var(--c-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); padding: 16px; z-index: 90; }
.cookie-banner__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; }
.cookie-banner p { margin: 0; }
.cookie-banner__actions { display: flex; gap: 8px; }
@media (min-width: 700px) {
	.cookie-banner { left: auto; right: 16px; max-width: 520px; }
}

/* ---------- 17. Content / entry ---------- */
.site-content { padding: 24px 0 56px; }
.entry__header { margin-bottom: 24px; }
.entry__title { font-size: clamp(1.875rem, 4vw, 3rem); margin-bottom: .25em; }
.entry__meta { color: var(--c-text-soft); font-size: var(--text-sm); display: flex; gap: 12px; flex-wrap: wrap; }
.entry__thumbnail { margin: 0 0 32px; border-radius: var(--radius-lg); overflow: hidden; }
.entry__thumbnail img, .entry__thumbnail svg { width: 100%; height: auto; display: block; }
.entry__content { font-size: var(--text-lg); }
.entry__content h2 { margin-top: 1.8em; }
.entry__content > * { max-width: 760px; }
.entry__content > .alignwide, .entry__content > .alignfull, .entry__content > .ctb-wide { max-width: none; }
.entry__content table { width: 100%; border-collapse: collapse; margin: 1.4em 0; }
.entry__content th, .entry__content td { border: 1px solid var(--c-border); padding: 10px 14px; text-align: left; }
.entry__content th { background: var(--c-bg-muted); }
.entry__content blockquote { border-left: 4px solid var(--c-primary); padding-left: 16px; color: var(--c-text-muted); font-style: italic; }
.entry__cta { background: var(--c-bg-muted); border-radius: var(--radius-lg); padding: 32px; text-align: center; margin: 48px 0; }
.entry__cta h2 { margin-top: 0; }

/* Quick answer box */
.quick-answer { background: linear-gradient(135deg, #ECFDF5 0%, #DBEAFE 100%); border: 1px solid #BFDBFE; border-radius: var(--radius-lg); padding: 20px 24px; margin: 0 0 32px; max-width: 760px; }
.quick-answer__label { font-size: var(--text-sm); text-transform: uppercase; letter-spacing: 0.08em; color: var(--c-text-soft); margin: 0 0 6px; }
.quick-answer__range { margin: 0; font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800; color: var(--c-secondary-700); }
.quick-answer__avg { margin: 4px 0 0; color: var(--c-text-muted); }
.quick-answer__meta { display: grid; gap: 8px; grid-template-columns: 1fr; margin-top: 16px; }
@media (min-width: 700px) { .quick-answer__meta { grid-template-columns: repeat(3, 1fr); } }
.quick-answer__meta dt { font-weight: 600; color: var(--c-text); font-size: var(--text-sm); }
.quick-answer__meta dd { margin: 0; color: var(--c-text-muted); font-size: var(--text-sm); }

/* Breadcrumbs */
.breadcrumbs { font-size: var(--text-sm); color: var(--c-text-soft); margin-bottom: 12px; }
.breadcrumbs a { color: var(--c-text-soft); text-decoration: none; }
.breadcrumbs a:hover { color: var(--c-primary); text-decoration: underline; }
.breadcrumbs__sep { margin: 0 6px; }

/* Sidebar */
.content-grid { display: grid; grid-template-columns: 1fr; gap: 32px; }
@media (min-width: 1000px) {
	.content-grid { grid-template-columns: minmax(0, 1fr) 320px; gap: 48px; }
}
.sidebar { position: sticky; top: calc(var(--head-height) + 16px); display: grid; gap: 24px; }
.sidebar-widget { background: var(--c-bg-2); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 20px; }
.sidebar-widget__title { font-size: var(--text-lg); margin-top: 0; }
.sidebar-widget__list { list-style: none; padding: 0; margin: 0; }
.sidebar-widget__list li { border-bottom: 1px solid var(--c-border); }
.sidebar-widget__list li:last-child { border-bottom: 0; }
.sidebar-widget__list a { display: block; padding: 8px 0; text-decoration: none; color: var(--c-text); }
.sidebar-widget__list a:hover { color: var(--c-primary); }

/* AdSense slot fallback */
.ad-slot { margin: 32px 0; min-height: 100px; }
.ad-slot--sidebar { min-height: 250px; }
.ad-slot:empty::after, .ad-slot:has(ins:empty)::after { content: 'Advertisement'; display: block; text-align: center; font-size: var(--text-sm); color: var(--c-text-soft); padding: 40px; background: var(--c-bg-muted); border-radius: var(--radius); }

/* 404 */
.error-404 { text-align: center; padding: 64px 0; }
.error-404__code { font-size: clamp(4rem, 12vw, 8rem); font-weight: 800; color: var(--c-primary); margin: 0; line-height: 1; }
.error-404__title { margin-top: 0; }
.error-404__search { max-width: 480px; margin: 24px auto; }
.error-404__suggest { max-width: 480px; margin: 32px auto 0; text-align: left; }
.error-404__suggest ul { padding-left: 20px; }

/* Search form */
.search-form { display: flex; gap: 8px; }
.search-form__field { flex: 1; padding: 12px 14px; border: 2px solid var(--c-border-strong); border-radius: var(--radius); }

/* Archive */
.archive-header { margin-bottom: 32px; }
.archive-header__intro { font-size: var(--text-lg); color: var(--c-text-muted); max-width: 70ch; }
.subpages-grid { margin: 48px 0; }
.subpages-grid h2 { margin-top: 0; }

/* Related */
.related-posts { margin-top: 48px; }
.related-posts__title { margin-bottom: 16px; }

/* Tables in content — make scrollable on mobile */
.entry__content { overflow-x: hidden; }
.entry__content table { display: block; overflow-x: auto; white-space: nowrap; }
@media (min-width: 700px) {
	.entry__content table { display: table; white-space: normal; }
}

/* Pagination */
.pagination, .nav-links { display: flex; gap: 8px; flex-wrap: wrap; margin: 32px 0; }
.pagination a, .pagination span, .nav-links a, .nav-links span { padding: 10px 14px; background: var(--c-bg-2); border: 1px solid var(--c-border); border-radius: 8px; text-decoration: none; color: var(--c-text); }
.pagination .current, .nav-links .current { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }

/* Print */
@media print {
	.site-header, .site-footer, .ad-slot, .cookie-banner, .newsletter-band, .entry__cta, .primary-nav { display: none !important; }
}