/* ============================================
   Battery Data Commons — Page Layouts
   ============================================ */

/* Main Content Offset */
main {
    padding-top: var(--nav-height);
}

/* Hero Section */
.hero {
    background: var(--color-bg-secondary);
    padding: var(--space-20) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-accent-gradient);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
}

.hero h1 {
    font-size: var(--text-5xl);
    margin-bottom: var(--space-6);
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: var(--text-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

/* Background Decoration */
.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.hero-bg-gradient {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
}

.hero-bg-gradient:nth-child(1) {
    top: -200px;
    right: -100px;
    background: var(--color-accent-primary);
}

.hero-bg-gradient:nth-child(2) {
    bottom: -300px;
    left: -100px;
    background: var(--color-accent-tertiary);
}

/* Find Data Page Layout - Independent Scroll Panels */
.find-data-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--space-8);
    height: calc(100vh - var(--nav-height) - var(--space-16));
    align-items: stretch;
}

@media (max-width: 1024px) {
    .find-data-layout {
        grid-template-columns: 1fr;
        height: auto;
    }
}

.sidebar {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    overflow-y: auto;
    max-height: 100%;
}

/* Custom scrollbar for sidebar */
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}

@media (max-width: 1024px) {
    .sidebar {
        max-height: 400px;
        overflow-y: auto;
    }
}

.results-area {
    overflow-y: auto;
    max-height: 100%;
    padding-right: var(--space-2);
}

/* Custom scrollbar for results */
.results-area::-webkit-scrollbar {
    width: 6px;
}

.results-area::-webkit-scrollbar-track {
    background: transparent;
}

.results-area::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.results-area::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}

@media (max-width: 1024px) {
    .results-area {
        max-height: none;
        overflow-y: visible;
        padding-right: 0;
    }
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
    gap: var(--space-4);
    position: sticky;
    top: 0;
    background: var(--color-bg-primary);
    padding: var(--space-2) 0;
    z-index: 10;
}

.results-count {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
}

.results-count span {
    color: var(--color-accent-primary);
}

.results-grid {
    display: grid;
    gap: var(--space-4);
}

/* Dataset Detail Page */
.dataset-detail {
    max-width: 900px;
    margin: 0 auto;
}

.dataset-detail-header {
    margin-bottom: var(--space-8);
}

.dataset-detail-header h1 {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-4);
}

.dataset-detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.dataset-detail-section {
    margin-bottom: var(--space-8);
}

.dataset-detail-section h2 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--color-border);
}

.dataset-detail-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
}

@media (max-width: 640px) {
    .dataset-detail-grid {
        grid-template-columns: 1fr;
    }
}

.detail-item {
    padding: var(--space-4);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.detail-item-label {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-1);
}

.detail-item-value {
    font-weight: var(--font-medium);
    color: var(--color-text-primary);
}

.cell-variants-summary {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}


.variant-values-card {
    padding: var(--space-4);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.variant-value-group + .variant-value-group {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border);
}

.variant-value-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.variant-value-chip {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-3);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-primary);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    line-height: 1;
}

.cell-variants-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg-card);
}

.cell-variants-table {
    width: 100%;
    min-width: 560px;
    border-collapse: collapse;
    font-size: var(--text-sm);
}

.cell-variants-table th,
.cell-variants-table td {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid var(--color-border);
}

.cell-variants-table th {
    background: var(--color-bg-secondary);
    color: var(--color-text-tertiary);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.cell-variants-table tbody tr:last-child td {
    border-bottom: 0;
}


/* Modern dataset detail — dense technical datasheet */
.dataset-detail {
    max-width: 1120px;
}

.dataset-detail-modern {
    width: 100%;
    padding-bottom: var(--space-12);
}

.dataset-detail-modern .detail-breadcrumb {
    margin-bottom: var(--space-8);
    font-size: 0.8125rem;
}

.detail-hero {
    padding: 0 0 var(--space-8);
    margin-bottom: var(--space-8);
    border-bottom: 1px solid var(--color-border);
}

.detail-kicker {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    color: var(--color-text-tertiary);
    font-size: var(--text-sm);
}

.detail-kicker .badge {
    padding: 0.35rem 0.65rem;
    font-size: 0.75rem;
    line-height: 1;
}

.detail-hero h1 {
    max-width: 820px;
    margin-bottom: var(--space-3);
    font-size: clamp(1.75rem, 2.6vw, 2.25rem);
    letter-spacing: -0.025em;
    line-height: 1.12;
}

.detail-summary {
    max-width: 820px;
    margin-bottom: var(--space-4);
    color: var(--color-text-secondary);
    font-size: 1.0625rem;
    line-height: 1.65;
}

.detail-meta-line {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0;
    margin-top: var(--space-3);
    color: var(--color-text-tertiary);
    font-size: var(--text-sm);
}

.detail-meta-item {
    display: inline-flex;
    align-items: center;
}

.detail-meta-item:not(:last-child)::after {
    content: '·';
    margin: 0 var(--space-2);
    color: var(--color-border);
}

.detail-actions {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    margin-top: var(--space-6);
}

.detail-primary-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.detail-download-list {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
}

.detail-download-action {
    justify-content: flex-start;
}

.detail-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    padding: 0.5rem 0.8rem;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    line-height: 1;
    cursor: pointer;
    transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.detail-action:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-text-tertiary);
    color: var(--color-text-primary);
}

.detail-action-primary {
    border-color: var(--color-text-primary);
    background: var(--color-text-primary);
    color: var(--color-bg-primary);
}

.detail-action-primary:hover {
    background: var(--color-text-secondary);
    border-color: var(--color-text-secondary);
    color: var(--color-bg-primary);
}

.detail-action.is-disabled {
    cursor: default;
    opacity: 0.65;
}

.dataset-detail-modern .detail-modern-section,
.dataset-detail-modern > .dataset-detail-section {
    margin-bottom: var(--space-10);
}

.dataset-detail-modern .detail-section-heading {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid var(--color-border);
}

.dataset-detail-modern .detail-section-heading h2,
.dataset-detail-modern > .dataset-detail-section > h2 {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 1.25rem;
    font-weight: var(--font-semibold);
    letter-spacing: -0.015em;
}

.detail-spec-groups {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(2rem, 5vw, 4.5rem);
    row-gap: var(--space-7);
}

.detail-profile-section .detail-spec-groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.detail-spec-group h3 {
    margin-bottom: var(--space-2);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: var(--font-semibold);
    letter-spacing: -0.005em;
}

.detail-spec-group dl {
    margin: 0;
    border-top: 1px solid var(--color-border);
}

.detail-spec-row {
    display: grid;
    grid-template-columns: minmax(120px, 43%) minmax(0, 57%);
    gap: var(--space-4);
    align-items: start;
    min-height: 40px;
    padding: 0.55rem 0;
    border-bottom: 1px solid var(--color-border);
}

.detail-spec-row dt,
.detail-spec-row dd {
    margin: 0;
    min-width: 0;
    overflow-wrap: anywhere;
}

.detail-spec-row dt {
    color: var(--color-text-tertiary);
    font-size: 0.8125rem;
    line-height: 1.45;
}

.detail-spec-row dd {
    color: var(--color-text-primary);
    font-size: 0.875rem;
    font-weight: var(--font-medium);
    line-height: 1.45;
}

.detail-spec-row.is-missing dd {
    color: var(--color-text-tertiary);
    font-weight: var(--font-normal);
}

.detail-inline-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
}

.detail-inline-chip {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.45rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    font-size: 0.75rem;
    font-weight: var(--font-medium);
    line-height: 1.1;
}

.dataset-detail-modern .cell-variants-summary {
    margin-bottom: var(--space-3);
    font-size: var(--text-sm);
}

.dataset-detail-modern .cell-variants-table-wrap {
    border: 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
    background: transparent;
}

.dataset-detail-modern .cell-variants-table th {
    padding: 0.65rem 0.75rem;
    background: transparent;
    font-size: 0.7rem;
}

.dataset-detail-modern .cell-variants-table td {
    padding: 0.65rem 0.75rem;
    font-size: 0.8125rem;
}

.detail-publication-list {
    border-top: 1px solid var(--color-border);
}

.detail-publication {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-primary);
    font-size: var(--text-sm);
    line-height: 1.5;
}

.detail-publication:hover {
    color: var(--color-accent-primary);
}

.detail-empty-note {
    margin: 0;
    padding: 0.8rem 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-tertiary);
    font-size: var(--text-sm);
}

.detail-correction {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-6);
    margin-top: var(--space-12);
    padding: var(--space-5) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.detail-correction > div {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.detail-correction strong {
    font-size: var(--text-sm);
}

.detail-correction span {
    color: var(--color-text-tertiary);
    font-size: 0.8125rem;
}

@media (max-width: 900px) {
    .detail-profile-section .detail-spec-groups {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 720px) {
    .dataset-detail {
        max-width: 100%;
    }

    .detail-spec-groups,
    .detail-profile-section .detail-spec-groups {
        grid-template-columns: 1fr;
        row-gap: var(--space-6);
    }

    .detail-hero h1 {
        font-size: 2rem;
    }

    .detail-summary {
        font-size: 1rem;
    }

    .detail-correction {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .detail-spec-row {
        grid-template-columns: 1fr;
        gap: 0.2rem;
    }

    .detail-actions {
        width: 100%;
    }

    .detail-action {
        flex: 1 1 auto;
    }

    .detail-primary-actions,
    .detail-download-list,
    .detail-download-action {
        width: 100%;
    }
}

/* Registry Entry Navigation */
.record-nav {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: var(--space-6);
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
}

.record-nav-link {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    max-width: 340px;
    min-width: 0;
    padding: 14px 18px;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-size: var(--text-sm);
    text-decoration: none;
    transition: border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.record-nav-previous {
    justify-self: start;
}

.record-nav-next {
    justify-self: end;
    justify-content: flex-end;
    text-align: right;
}

.record-nav-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.record-nav-arrow {
    width: 13px;
    height: 13px;
}

.record-nav-arrow-previous {
    transform: rotate(-135deg);
}

.record-nav-arrow-next {
    transform: rotate(45deg);
}

.record-nav-position {
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--color-text-primary);
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.record-nav-count {
    margin-left: 6px;
    font-weight: var(--font-normal);
    color: var(--color-text-tertiary);
    font-variant-numeric: tabular-nums;
}

@media (max-width: 640px) {
    .record-nav {
        grid-template-columns: 1fr;
        gap: var(--space-3);
        margin-top: var(--space-10);
    }

    .record-nav-slot:empty {
        display: none;
    }

    .record-nav-position {
        order: -1;
        justify-self: center;
    }

    .record-nav-link {
        max-width: none;
        width: 100%;
        justify-self: stretch;
    }
}

/* About Page */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content h2 {
    font-size: var(--text-2xl);
    margin-top: var(--space-10);
    margin-bottom: var(--space-4);
}

.about-content h3 {
    font-size: var(--text-lg);
    margin-top: var(--space-6);
    margin-bottom: var(--space-3);
}

.about-content ul {
    list-style: none;
    padding: 0;
}

.about-content li {
    position: relative;
    padding-left: var(--space-6);
    margin-bottom: var(--space-3);
}

.about-content li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    background: var(--color-accent-primary);
    border-radius: 50%;
}

/* Contribute Page */
.contribute-steps {
    counter-reset: step;
}

.contribute-step {
    display: flex;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
    position: relative;
}

.contribute-step::before {
    counter-increment: step;
    content: counter(step);
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: var(--color-accent-gradient);
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-bold);
    font-size: var(--text-lg);
}

.contribute-step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 23px;
    top: 56px;
    width: 2px;
    height: calc(100% - 40px);
    background: var(--color-border);
}

.contribute-step-content h3 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-2);
}

.contribute-step-content p {
    color: var(--color-text-secondary);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-8);
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-6);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.empty-state-icon svg {
    width: 40px;
    height: 40px;
    color: var(--color-text-tertiary);
}

.empty-state h3 {
    margin-bottom: var(--space-2);
}

.empty-state p {
    color: var(--color-text-secondary);
    max-width: 400px;
    margin: 0 auto;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-6);
}

.breadcrumb a {
    color: var(--color-text-tertiary);
}

.breadcrumb a:hover {
    color: var(--color-accent-primary);
}

.breadcrumb-separator {
    color: var(--color-text-tertiary);
}