/**
 * Researchium - Volume Archive Page Styles
 * Scope: taxonomy-volume.php / is_tax('volume')
 * Standards: Nature, Oxford Academic, Springer Nature
 * Prefix: .rs-volume-
 */

/* Master Wrapper */
.rs-volume-page {
	width: 100%;
	max-width: 1280px;
	margin: 0 auto;
	padding: 24px 20px 80px 20px;
	font-family: var(--rs-font-body);
	color: var(--rs-color-text-main);
	line-height: 1.6;
	background-color: var(--rs-color-background-white);
}

/* Breadcrumbs */
.rs-volume-breadcrumbs {
	font-size: 13px;
	color: var(--rs-color-text-muted);
	margin-bottom: 24px;
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	gap: 6px;
}

.rs-volume-breadcrumbs a {
	color: var(--rs-color-text-main);
	text-decoration: none;
	transition: color 0.15s ease;
}

.rs-volume-breadcrumbs a:hover {
	color: var(--rs-color-secondary);
	text-decoration: underline;
}

.rs-volume-breadcrumbs__sep {
	color: var(--rs-color-border);
}

.rs-volume-breadcrumbs__current {
	color: var(--rs-color-primary);
	font-weight: 600;
}

/* Masthead / Hero */
.rs-volume-masthead {
	background-color: var(--rs-color-background-light);
	border: 1px solid var(--rs-color-border);
	border-radius: 4px;
	padding: 40px 36px;
	margin-bottom: 32px;
}

.rs-volume-masthead__badge-row {
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	gap: 10px;
	margin-bottom: 16px;
}

.rs-volume-masthead__category {
	font-size: 11px;
	font-weight: 700;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--rs-color-primary);
	background: var(--rs-color-background-white);
	border: 1px solid var(--rs-color-border);
	padding: 4px 10px;
	border-radius: 3px;
}

.rs-volume-pill {
	display: inline-flex;
	align-items: center;
	gap: 5px;
	font-size: 11.5px;
	font-weight: 600;
	color: var(--rs-color-text-muted);
	background: var(--rs-color-background-white);
	border: 1px solid var(--rs-color-border);
	padding: 4px 10px;
	border-radius: 3px;
}

.rs-volume-masthead__journal {
	font-size: 14px;
	font-weight: 600;
	color: var(--rs-color-secondary);
	margin-bottom: 8px;
}

.rs-volume-masthead__journal a {
	color: var(--rs-color-secondary);
	text-decoration: none;
}

.rs-volume-masthead__journal a:hover {
	text-decoration: underline;
}

.rs-volume-masthead__title {
	font-family: var(--rs-font-heading);
	font-size: 32px;
	font-weight: 700;
	color: var(--rs-color-primary);
	line-height: 1.25;
	margin: 0 0 12px 0;
}

.rs-volume-masthead__meta {
	font-size: 14px;
	color: var(--rs-color-text-muted);
	margin-bottom: 24px;
}

.rs-volume-masthead__actions {
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	gap: 12px;
}

/* Stats Bar */
.rs-volume-stats {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	border: 1px solid var(--rs-color-border);
	border-radius: 4px;
	background-color: var(--rs-color-background-white);
	margin-bottom: 40px;
	overflow: hidden;
}

.rs-volume-stats__item {
	padding: 20px;
	text-align: center;
	border-right: 1px solid var(--rs-color-border);
}

.rs-volume-stats__item:last-child {
	border-right: none;
}

.rs-volume-stats__value {
	font-size: 26px;
	font-weight: 700;
	color: var(--rs-color-primary);
	line-height: 1.1;
	margin-bottom: 4px;
}

.rs-volume-stats__label {
	font-size: 11px;
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--rs-color-text-muted);
}

/* Split Layout */
.rs-volume-layout {
	display: grid;
	grid-template-columns: 1fr;
	gap: 40px;
	align-items: start;
}

@media (min-width: 992px) {
	.rs-volume-layout {
		grid-template-columns: 1fr 320px;
	}
}

/* Sections */
.rs-volume-section {
	margin-bottom: 40px;
}

.rs-volume-section__title {
	font-family: var(--rs-font-heading);
	font-size: 22px;
	font-weight: 700;
	color: var(--rs-color-primary);
	margin: 0 0 20px 0;
	padding-bottom: 10px;
	border-bottom: 1px solid var(--rs-color-border);
}

/* Overview Box */
.rs-volume-overview {
	background: var(--rs-color-background-light);
	border: 1px solid var(--rs-color-border);
	border-left: 4px solid var(--rs-color-primary);
	padding: 24px;
	border-radius: 4px;
	margin-bottom: 32px;
}

.rs-volume-overview__title {
	font-size: 13px;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--rs-color-primary);
	margin: 0 0 10px 0;
}

.rs-volume-overview__text {
	font-size: 15px;
	line-height: 1.7;
	color: var(--rs-color-text-main);
	margin: 0;
}

/* Issues Grid */
.rs-volume-issue-grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: 20px;
}

@media (min-width: 600px) {
	.rs-volume-issue-grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

.rs-volume-issue-card {
	border: 1px solid var(--rs-color-border);
	border-radius: 4px;
	padding: 20px;
	background: var(--rs-color-background-white);
	display: flex;
	gap: 18px;
	transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.rs-volume-issue-card:hover {
	border-color: var(--rs-color-secondary);
	box-shadow: 0 4px 12px rgba(15, 43, 77, 0.06);
}

.rs-volume-issue-cover {
	width: 90px;
	min-height: 120px;
	border: 1px solid var(--rs-color-border);
	background-color: var(--rs-color-background-light);
	border-radius: 2px;
	display: flex;
	flex-direction: column;
	justify-content: space-between;
	padding: 10px;
	flex-shrink: 0;
	box-sizing: border-box;
}

.rs-volume-issue-cover__tag {
	font-size: 9px;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	color: var(--rs-color-primary);
	border-bottom: 1px solid var(--rs-color-border);
	padding-bottom: 3px;
	line-height: 1.2;
}

.rs-volume-issue-cover__name {
	font-family: var(--rs-font-heading);
	font-size: 14px;
	font-weight: 700;
	color: var(--rs-color-primary);
	margin: 6px 0;
	line-height: 1.2;
}

.rs-volume-issue-cover__year {
	font-size: 10px;
	font-weight: 600;
	color: var(--rs-color-text-muted);
	text-align: right;
}

.rs-volume-issue-details {
	display: flex;
	flex-direction: column;
	justify-content: space-between;
	flex-grow: 1;
}

.rs-volume-issue-details__title {
	font-family: var(--rs-font-heading);
	font-size: 17px;
	font-weight: 700;
	margin: 0 0 6px 0;
	line-height: 1.3;
}

.rs-volume-issue-details__title a {
	color: var(--rs-color-primary);
	text-decoration: none;
}

.rs-volume-issue-details__title a:hover {
	color: var(--rs-color-secondary);
	text-decoration: underline;
}

.rs-volume-issue-details__meta {
	font-size: 13px;
	color: var(--rs-color-text-muted);
	margin-bottom: 14px;
	line-height: 1.5;
}

.rs-volume-issue-details__action {
	margin-top: auto;
}

/* Articles List */
.rs-volume-articles-list {
	display: flex;
	flex-direction: column;
	gap: 16px;
}

.rs-volume-article-item {
	border: 1px solid var(--rs-color-border);
	border-radius: 4px;
	padding: 20px;
	background: var(--rs-color-background-white);
	transition: border-color 0.2s ease;
}

.rs-volume-article-item:hover {
	border-color: var(--rs-color-secondary);
}

.rs-volume-article-item__title {
	font-family: var(--rs-font-heading);
	font-size: 17px;
	font-weight: 700;
	line-height: 1.4;
	margin: 0 0 8px 0;
}

.rs-volume-article-item__title a {
	color: var(--rs-color-primary);
	text-decoration: none;
}

.rs-volume-article-item__title a:hover {
	color: var(--rs-color-secondary);
	text-decoration: underline;
}

.rs-volume-article-item__authors {
	font-size: 13.5px;
	color: var(--rs-color-text-muted);
	margin-bottom: 10px;
}

.rs-volume-article-item__meta-row {
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	gap: 14px;
	font-size: 12.5px;
	color: var(--rs-color-text-muted);
}

.rs-volume-article-item__meta-row span {
	display: inline-flex;
	align-items: center;
	gap: 4px;
}

.rs-volume-article-item__action {
	margin-left: auto;
}

/* Sidebar Widgets */
.rs-volume-sidebar {
	display: flex;
	flex-direction: column;
	gap: 24px;
}

.rs-volume-widget {
	background: var(--rs-color-background-white);
	border: 1px solid var(--rs-color-border);
	border-radius: 4px;
	padding: 22px;
}

.rs-volume-widget__title {
	font-size: 12px;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--rs-color-primary);
	margin: 0 0 16px 0;
	padding-bottom: 8px;
	border-bottom: 1px solid var(--rs-color-border);
}

.rs-volume-widget__text {
	font-size: 13.5px;
	line-height: 1.6;
	color: var(--rs-color-text-muted);
	margin: 0 0 16px 0;
}

.rs-volume-widget__journal-title {
	margin: 0 0 10px 0;
	font-family: var(--rs-font-heading);
	font-size: 15px;
	font-weight: 700;
}

.rs-volume-widget__journal-title a {
	color: var(--rs-color-primary);
	text-decoration: none;
}

.rs-volume-widget__journal-title a:hover {
	color: var(--rs-color-secondary);
	text-decoration: underline;
}

.rs-volume-widget__btn {
	display: block;
	text-align: center;
	width: 100%;
	box-sizing: border-box;
}

.rs-volume-sibling-list {
	list-style: none;
	padding: 0;
	margin: 0;
	display: flex;
	flex-direction: column;
	gap: 6px;
}

.rs-volume-sibling-link {
	color: var(--rs-color-text-main);
	text-decoration: none;
	font-size: 13.5px;
	font-weight: 500;
	padding: 8px 12px;
	display: block;
	border-radius: 3px;
	transition: background-color 0.15s ease, color 0.15s ease;
}

.rs-volume-sibling-link:hover {
	color: var(--rs-color-primary);
	background-color: var(--rs-color-background-light);
}

.rs-volume-sibling-link.is-active {
	color: var(--rs-color-primary);
	font-weight: 700;
	background-color: var(--rs-color-background-light);
	border-left: 3px solid var(--rs-color-secondary);
}

/* Empty State */
.rs-volume-empty {
	text-align: center;
	padding: 40px 20px;
	background: var(--rs-color-background-light);
	border: 1px dashed var(--rs-color-border);
	border-radius: 4px;
}

.rs-volume-empty__title {
	font-family: var(--rs-font-heading);
	font-size: 18px;
	color: var(--rs-color-primary);
	margin: 0 0 8px 0;
}

.rs-volume-empty__text {
	font-size: 14px;
	color: var(--rs-color-text-muted);
	margin: 0 0 16px 0;
}