<?php
/**
 * Unified two-column shell, calculator UI, ads, and related tools.
 *
 * @package USB_Type_B
 */

.site-main--shell {
	padding: 0;
}

.content-shell {
	width: 100%;
	max-width: 1240px;
	margin: 0 auto;
	padding: 2rem 5px 3rem;
}

.content-shell__breadcrumb {
	margin: 0 0 1.5rem;
	font-size: 0.875rem;
	color: var(--color-text-muted);
}

.content-shell__breadcrumb-list {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 0.35rem;
	list-style: none;
	margin: 0;
	padding: 0;
}

.content-shell__breadcrumb a {
	color: var(--color-text-muted);
}

.content-shell__breadcrumb a:hover {
	color: var(--color-primary-hover);
}

.content-shell__breadcrumb-current {
	font-weight: 600;
	color: var(--color-text);
}

.content-shell__grid {
	display: block;
}

.content-shell__main {
	min-width: 0;
}

.content-shell__aside {
	display: none;
}

.content-shell__header {
	margin: 0 0 2rem;
}

.content-shell__badge {
	display: inline-block;
	margin-bottom: 1rem;
	padding: 0.25rem 0.75rem;
	border-radius: var(--radius-full);
	background: var(--color-primary-soft);
	color: var(--color-primary);
	font-size: 0.75rem;
	font-weight: 700;
}

.content-shell__title {
	margin: 0;
	font-size: clamp(1.75rem, 3vw, 2.25rem);
	font-weight: 800;
	letter-spacing: -0.03em;
	color: var(--color-text);
}

.content-shell__subtitle {
	margin: 0.75rem 0 0;
	font-size: 1.125rem;
	line-height: 1.6;
	color: var(--color-text-muted);
}

.content-shell__meta {
	margin: 0.75rem 0 0;
	font-size: 0.875rem;
	color: var(--color-text-muted);
}

.content-shell__hero {
	margin: 0 0 2rem;
}

.content-shell__featured {
	overflow: hidden;
	margin: 0 0 3rem;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-lg);
	background: var(--color-surface);
	box-shadow: var(--shadow-card);
}

.content-shell__featured img {
	width: 100%;
	aspect-ratio: 16 / 9;
	object-fit: cover;
}

.content-shell__calculator {
	padding: 1.25rem;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-lg);
	background: var(--color-surface);
	box-shadow: var(--shadow-card);
}

.article-content {
	color: var(--color-text-muted);
	font-size: 1.05rem;
	line-height: 1.7;
}

.article-content h2,
.article-content h3,
.article-content h4 {
	color: var(--color-text);
}

.article-content h2 {
	margin: 2rem 0 0.75rem;
	font-size: 1.5rem;
	font-weight: 700;
}

.article-content h3 {
	margin: 1.5rem 0 0.5rem;
	font-size: 1.185rem;
	font-weight: 700;
}

.article-content p {
	margin: 1rem 0;
}

.article-content ul,
.article-content ol {
	margin: 1rem 0;
	padding-left: 1.25rem;
}

.article-content ul {
	list-style: disc;
}

.article-content ol {
	list-style: decimal;
}

.article-content li {
	margin: 0.375rem 0;
}

.article-content a {
	color: var(--color-primary-hover);
	text-decoration: underline;
}

.article-content strong {
	color: var(--color-text);
	font-weight: 700;
}

.content-shell__footer {
	margin-top: 2.5rem;
	padding-top: 1.5rem;
	border-top: 1px solid var(--color-border);
}

.content-shell__back {
	display: inline-block;
	margin-top: 1rem;
	font-weight: 600;
	text-decoration: underline;
}

.content-shell .comments-area {
	margin-top: 2.5rem;
	padding: 0;
	background: transparent;
	border: 0;
	box-shadow: none;
}

.tool-content-section {
	margin-bottom: 0.5rem;
}

.tool-content-section__title {
	font-size: 1.5rem;
	margin: 2rem 0 0.75rem;
	color: var(--color-text);
}

.tool-content-section__content,
.tool-content-lead {
	color: var(--color-text-muted);
	line-height: 1.7;
}

.tool-steps-list,
.tool-facts-list {
	margin: 1rem 0;
	padding-left: 1.25rem;
}

.tool-steps-list {
	list-style: decimal;
}

.tool-facts-list {
	list-style: disc;
}

.related-tools {
	margin-top: 3rem;
}

.related-tools__title {
	margin: 0 0 1.25rem;
	font-size: 1.5rem;
	font-weight: 800;
	color: var(--color-text);
}

.related-tools__grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: 1rem;
}

.usbtypeb-ad {
	display: block;
	box-sizing: border-box;
	width: 300px;
	max-width: 100%;
	margin: 0 auto;
	overflow: visible;
	text-align: center;
}

.usbtypeb-ad ins.adsbygoogle {
	display: block;
}

.usbtypeb-ad iframe {
	max-width: none;
}

.usbtypeb-ad--sidebar-300x600,
.usbtypeb-ad--sidebar-right-300x600 {
	min-height: 600px;
}

.usbtypeb-ad--sidebar-300x250,
.usbtypeb-ad--sidebar-right-300x250,
.usbtypeb-ad--tool-before-calculate,
.usbtypeb-ad--tool-after-results {
	min-height: 250px;
}

.tool-calc__fields {
	display: grid;
	grid-template-columns: 1fr;
	gap: 1.25rem;
}

.calc-field label {
	display: block;
	margin-bottom: 0.4rem;
	font-size: 0.9rem;
	font-weight: 600;
	color: var(--color-text);
}

.calc-field__hint {
	margin: 0.35rem 0 0;
	font-size: 0.75rem;
	color: var(--color-text-muted);
}

.tool-input,
.tool-select {
	width: 100%;
	padding: 0.65rem 0.9rem;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-sm);
	background: var(--color-bg);
	color: var(--color-text);
	font-size: 0.95rem;
}

.tool-input:focus,
.tool-select:focus {
	outline: none;
	border-color: var(--color-primary);
	box-shadow: var(--focus);
}

.tool-calc__ad {
	display: flex;
	justify-content: center;
	margin-top: 1.5rem;
}

.tool-calc__actions {
	display: flex;
	flex-wrap: wrap;
	gap: 0.75rem;
	margin-top: 1.5rem;
}

.tool-btn {
	padding: 0.75rem 1.5rem;
	border-radius: var(--radius-sm);
	font-size: 0.9rem;
	font-weight: 700;
	cursor: pointer;
	transition: background-color 0.15s ease, border-color 0.15s ease;
}

.tool-btn--primary {
	border: 0;
	background: var(--color-primary);
	color: var(--color-white);
}

.tool-btn--primary:hover {
	background: var(--color-primary-hover);
	color: var(--color-white);
}

.tool-btn--secondary {
	border: 1px solid var(--color-border);
	background: var(--color-bg);
	color: var(--color-text);
}

.tool-btn--secondary:hover {
	background: var(--color-bg-soft);
}

.tool-calc__results {
	margin-top: 1.5rem;
	padding: 1.25rem;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-md);
	background: var(--color-bg-soft);
}

.tool-calc__results-title {
	margin: 0;
	font-size: 0.8rem;
	font-weight: 700;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--color-text-muted);
}

.tool-calc__results-grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: 1rem;
	margin: 1rem 0 0;
}

.tool-calc__result dt {
	margin: 0 0 0.2rem;
	font-size: 0.7rem;
	font-weight: 600;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--color-text-muted);
}

.tool-calc__result dd {
	margin: 0;
	font-size: 1.25rem;
	font-weight: 800;
	color: var(--color-text);
}

.tool-calc__result dd.is-emphasis {
	font-size: 1.5rem;
	color: var(--color-primary);
}

.tool-calc__note {
	margin: 1rem 0 0;
	font-size: 0.875rem;
	color: var(--color-text-muted);
}

.tool-formula-display {
	margin: 0;
	padding: 1rem;
	border-radius: var(--radius-sm);
	background: var(--color-primary-soft);
	text-align: center;
}

.tool-formula-main {
	display: block;
	font-size: 1.5rem;
	font-weight: 800;
	color: var(--color-primary);
}

.tool-formula-variants {
	display: block;
	margin-top: 0.35rem;
	font-size: 0.9rem;
	color: var(--color-text-muted);
}

.tool-resistor-visual {
	margin: 1.5rem 0 0;
	padding: 1.5rem;
	border-radius: var(--radius-sm);
	background: var(--color-bg-soft);
}

.tool-resistor-body {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	height: 60px;
	padding: 0 1rem;
	position: relative;
	border-radius: 4px;
	background: linear-gradient(to bottom, #f5f5dc, #d4c4a8);
}

.tool-resistor-body::before,
.tool-resistor-body::after {
	content: "";
	position: absolute;
	top: 50%;
	width: 30px;
	height: 4px;
	background: #666;
	transform: translateY(-50%);
}

.tool-resistor-body::before {
	left: -15px;
}

.tool-resistor-body::after {
	right: -15px;
}

.tool-resistor-band {
	display: none;
	width: 12px;
	height: 100%;
	border-radius: 2px;
	background: #ccc;
}

.tool-resistor-band.active {
	display: block;
}

@media (min-width: 640px) {
	.content-shell {
		padding: 2rem 1.25rem 3.5rem;
	}

	.content-shell__calculator {
		padding: 2rem;
	}

	.tool-calc__fields {
		grid-template-columns: 1fr 1fr;
	}

	.calc-field--full {
		grid-column: 1 / -1;
	}

	.tool-calc__results-grid {
		grid-template-columns: 1fr 1fr;
	}

	.related-tools__grid {
		grid-template-columns: 1fr 1fr;
	}
}

@media (min-width: 960px) {
	.content-shell {
		padding: 3rem 1.5rem 4rem;
	}

	.content-shell__grid {
		display: grid;
		grid-template-columns: minmax(0, 1fr) 300px;
		gap: 2rem;
		align-items: start;
	}

	.content-shell__aside {
		display: block;
	}

	.content-shell__ads {
		display: flex;
		flex-direction: column;
		align-items: center;
		gap: 1.5rem;
		width: 300px;
	}

	.tool-calc__ad {
		display: none;
	}

	.content-shell__title {
		font-size: 2.25rem;
	}
}