/* Design tokens — aligned with ateel-pc.s2.innovativebaseline.ro */
:root {
    color-scheme: light dark;
    --bg: #0f1419;
    --panel: #1a2332;
    --panel-border: #2d3a4d;
    --text: #e8eef7;
    --muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger-bg: #3f1d24;
    --danger-text: #fecaca;
    --success-bg: #14352a;
    --success-text: #bbf7d0;
    --warning-bg: rgba(234, 179, 8, 0.18);
    --warning-text: #fde68a;
    --info-bg: rgba(59, 130, 246, 0.15);
    font-family: "Segoe UI", system-ui, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top, rgba(59, 130, 246, 0.18), transparent 40%),
        var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.page {
    max-width: 720px;
    margin: 0 auto;
    padding: 3rem 1.25rem 2rem;
}

.page-wide {
    max-width: 1180px;
}

.header h1 {
    margin: 0 0 0.5rem;
    font-size: 2rem;
    font-weight: 700;
}

.header-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    flex-wrap: wrap;
}

.subtitle {
    margin: 0;
    color: var(--muted);
    max-width: 42rem;
}

.build-meta {
    margin: 0.75rem 0 0;
    font-size: 0.85rem;
    color: var(--muted);
}

.version-details {
    margin: 0;
    min-width: 8rem;
}

.version-details summary {
    cursor: pointer;
    color: var(--muted);
    font-size: 0.85rem;
    list-style: none;
    text-align: right;
}

.version-details summary::-webkit-details-marker {
    display: none;
}

.version-details[open] summary {
    margin-bottom: 0.5rem;
    color: var(--text);
}

.version-panel {
    font-size: 0.85rem;
    max-width: 20rem;
    margin-left: auto;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.25rem;
}

.site-nav a {
    color: var(--muted);
    text-decoration: none;
    padding: 0.35rem 0.75rem;
    border: 1px solid var(--panel-border);
    border-radius: 999px;
    font-size: 0.85rem;
}

.site-nav a:hover,
.site-nav a.is-active {
    color: var(--text);
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.12);
}

.messages {
    margin: 1.5rem 0;
}

.message {
    padding: 0.85rem 1rem;
    border-radius: 0.75rem;
    margin-bottom: 0.75rem;
    white-space: pre-line;
}

.message-danger,
.message-error {
    background: var(--danger-bg);
    color: var(--danger-text);
}

.message-success {
    background: var(--success-bg);
    color: var(--success-text);
}

.message-warning {
    background: var(--warning-bg);
    color: var(--warning-text);
}

.message-info {
    background: var(--info-bg);
    color: var(--text);
}

.panel {
    padding: 1rem 1.15rem;
    border: 1px solid var(--panel-border);
    border-radius: 0.75rem;
    background: var(--panel);
}

.info-panel {
    margin-top: 1.5rem;
}

.info-panel p {
    margin: 0 0 0.65rem;
    color: var(--muted);
    font-size: 0.92rem;
}

.info-panel p:last-child {
    margin-bottom: 0;
}

.merge-intro {
    margin-top: 1.5rem;
    padding: 1.15rem 1.25rem;
    border: 1px solid var(--panel-border);
    border-radius: 0.75rem;
    background: var(--panel);
}

.merge-intro-lead {
    margin: 0 0 1rem;
    color: var(--text);
    font-size: 0.95rem;
    line-height: 1.5;
}

.merge-intro-heading {
    margin: 1.25rem 0 0.85rem;
    font-size: 1rem;
    font-weight: 600;
}

.strategy-cards {
    display: grid;
    gap: 1rem;
}

@media (min-width: 900px) {
    .strategy-cards {
        grid-template-columns: repeat(3, 1fr);
    }
}

.strategy-card {
    margin: 0;
    padding: 0;
    border: 1px solid var(--panel-border);
    border-radius: 0.65rem;
    background: var(--bg);
    overflow: hidden;
    cursor: pointer;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.strategy-card:hover {
    border-color: rgba(59, 130, 246, 0.45);
}

.strategy-card:focus {
    outline: none;
}

.strategy-card:focus-visible {
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.35);
}

.strategy-card.is-selected {
    border: 3px solid var(--accent);
    box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.2);
}

.strategy-card-image {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-bottom: 1px solid var(--panel-border);
}

.strategy-card-title {
    margin: 0.75rem 0.9rem 0.35rem;
    font-size: 0.95rem;
    font-weight: 600;
}

.strategy-card-text {
    margin: 0 0.9rem 0.9rem;
    color: var(--muted);
    font-size: 0.86rem;
    line-height: 1.45;
}

.option {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    margin-top: 1rem;
    padding: 0.85rem 1rem;
    border: 1px solid var(--panel-border);
    border-radius: 0.75rem;
    background: var(--panel);
    color: var(--text);
    cursor: pointer;
    user-select: none;
}

.option input {
    margin-top: 0.15rem;
    accent-color: var(--accent);
}

.drop-zone {
    margin-top: 1rem;
    padding: 2rem 1.25rem;
    border: 2px dashed var(--panel-border);
    border-radius: 1rem;
    background: var(--panel);
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease;
}

.drop-zone:hover,
.drop-zone:focus-visible,
.drop-zone.drag-over {
    border-color: var(--accent);
    background: #1f2a3d;
    outline: none;
}

.drop-zone.has-file {
    border-style: solid;
    border-color: rgba(59, 130, 246, 0.55);
}

.drop-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    margin-bottom: 0.75rem;
    border-radius: 999px;
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent);
    font-weight: 700;
    font-size: 0.75rem;
    letter-spacing: 0.04em;
}

.drop-title {
    margin: 0 0 0.35rem;
    font-size: 1rem;
    font-weight: 600;
}

.drop-hint,
.drop-browse,
.selected-file {
    margin: 0;
    color: var(--muted);
    font-size: 0.88rem;
}

.drop-browse {
    margin-top: 0.35rem;
}

.selected-file {
    margin-top: 0.75rem;
    color: var(--text);
    word-break: break-all;
}

.upload-grid {
    display: grid;
    gap: 1rem;
    margin-top: 1.5rem;
}

@media (min-width: 768px) {
    .upload-grid.two-up {
        grid-template-columns: 1fr 1fr;
    }
}

/* Merge configuration surfaces */
.merge-surface {
    margin-top: 1.5rem;
    padding: 1.15rem 1.25rem;
    border: 1px solid #cbd5e1;
    border-radius: 0.75rem;
    background: #ffffff;
    color: #0f172a;
}

.merge-surface h2 {
    margin: 0 0 1rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.merge-surface .form-label {
    color: #64748b;
}

.merge-surface .form-select,
.merge-surface .form-input {
    background: #ffffff;
    color: #0f172a;
    border-color: #cbd5e1;
}

.merge-surface .text-muted {
    color: #64748b;
}

.merge-surface .btn-link {
    color: #2563eb;
}

.precheck-summary-panel {
    margin-top: 1.5rem;
}

.precheck-mapping-panel {
    margin-top: 1rem;
    padding: 1rem 1rem 0;
    overflow: hidden;
}

.precheck-mapping-legend {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem 1rem;
    margin-bottom: 0.75rem;
    padding: 0.55rem 0.75rem;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
    background: #f8fafc;
    font-size: 0.82rem;
    color: #64748b;
}

.precheck-legend-label {
    font-weight: 600;
    color: #0f172a;
}

.precheck-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.precheck-legend-swatch {
    display: inline-block;
    width: 0.85rem;
    height: 0.85rem;
    border-radius: 0.15rem;
    border: 1px solid rgba(15, 23, 42, 0.12);
    flex-shrink: 0;
}

.precheck-legend-swatch-merge {
    background-color: rgba(253, 224, 71, 0.55);
}

.precheck-legend-swatch-insert {
    background-color: rgba(34, 197, 94, 0.35);
}

.precheck-legend-swatch-void {
    background-color: rgba(148, 163, 184, 0.45);
}

.precheck-legend-swatch-unchanged {
    background-color: #ffffff;
}

.precheck-mapping-panel .precheck-hierarchy-scroll {
    margin-top: 0;
    border: none;
    border-radius: 0;
}

.form-section {
    margin-top: 2rem;
}

.form-section h2 {
    margin: 0 0 1rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.merge-config-fields {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 1rem;
}

.merge-config-fields .form-field {
    flex: 1 1 10rem;
    margin-bottom: 0;
    min-width: 0;
}

.merge-config-fields .form-field-checkbox {
    flex: 1 1 100%;
}

.form-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    padding: 0.65rem 0;
    font-size: 0.92rem;
    cursor: pointer;
}

.form-check input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    margin: 0;
    flex-shrink: 0;
}

.form-static {
    margin: 0;
    padding: 0.65rem 0;
    color: var(--muted);
    font-size: 0.92rem;
}

@media (max-width: 767px) {
    .merge-config-fields {
        flex-direction: column;
        align-items: stretch;
    }
}

.form-field {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    margin-bottom: 0.35rem;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--muted);
}

.form-input,
.form-select,
.form-control {
    width: 100%;
    padding: 0.65rem 0.85rem;
    border: 1px solid var(--panel-border);
    border-radius: 0.75rem;
    background: var(--panel);
    color: var(--text);
    font: inherit;
}

.form-input:focus,
.form-select:focus,
.form-control:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.form-hint {
    margin-top: 0.35rem;
    font-size: 0.85rem;
    color: var(--muted);
}

.form-hint a {
    color: var(--accent);
}

.actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem 1.35rem;
    border: 1px solid transparent;
    border-radius: 0.75rem;
    background: transparent;
    color: var(--text);
    font: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
    color: #fff;
}

.btn-success {
    background: #16a34a;
    color: #fff;
}

.btn-success:hover {
    background: #15803d;
    color: #fff;
}

.btn-outline {
    border-color: var(--panel-border);
    color: var(--text);
}

.btn-outline:hover:not(:disabled) {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
}

.btn-link {
    padding: 0;
    border: none;
    background: none;
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 500;
}

.btn-lg {
    padding: 0.85rem 2rem;
    font-size: 1.05rem;
}

.btn-sm {
    padding: 0.25rem 0.55rem;
    font-size: 0.72rem;
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.status {
    margin: 1.25rem 0 0;
    padding: 0.85rem 1rem;
    border-radius: 0.75rem;
}

.status-info {
    background: var(--info-bg);
    color: var(--text);
}

.status-success {
    background: var(--success-bg);
    color: var(--success-text);
}

.status-danger {
    background: var(--danger-bg);
    color: var(--danger-text);
}

.footer {
    margin-top: 2rem;
    text-align: center;
}

.footer a {
    color: var(--muted);
    text-decoration: none;
}

.footer a:hover {
    color: var(--text);
}

.text-muted {
    color: var(--muted);
}

.text-small,
.text-sm {
    font-size: 0.85rem;
}

.text-center {
    text-align: center;
}

.hidden {
    display: none !important;
}

.flex-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
}

.flex-grow {
    flex: 1 1 auto;
}

.log-panel {
    margin-top: 1.5rem;
}

.log-panel pre {
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 0.85rem;
    color: var(--muted);
}

.data-table,
.precheck-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
    table-layout: fixed;
}

.data-table th,
.data-table td,
.precheck-table th,
.precheck-table td {
    border: 1px solid var(--panel-border);
    padding: 0.45rem 0.55rem;
    vertical-align: top;
}

.data-table thead th,
.precheck-table thead th {
    background: #dbeafe;
    color: #0f172a;
    position: sticky;
    top: 0;
    z-index: 2;
}

.merge-surface .data-table,
.merge-surface .precheck-table {
    background: #ffffff;
}

.merge-surface .data-table td,
.merge-surface .precheck-table td {
    background: #ffffff;
    color: #0f172a;
}

.merge-surface .data-table thead th,
.merge-surface .precheck-table thead th {
    background: #bfdbfe;
    color: #0f172a;
}

.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
    max-width: min(22rem, calc(100vw - 2rem));
}

.toast {
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    background: var(--accent);
    color: #fff;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

/* Merge result */
.result-status {
    margin-top: 1.5rem;
}

.file-result {
    margin-top: 1rem;
    padding: 1.5rem 1.25rem;
    border: 1px solid var(--panel-border);
    border-radius: 1rem;
    background: var(--panel);
    text-align: center;
}

.file-result.is-source {
    border-color: rgba(59, 130, 246, 0.35);
}

.file-result.is-target {
    border-color: rgba(34, 197, 94, 0.35);
}

.file-result.is-output {
    margin-top: 1.5rem;
    border-color: rgba(59, 130, 246, 0.55);
    background:
        radial-gradient(circle at top, rgba(59, 130, 246, 0.12), transparent 55%),
        var(--panel);
}

.file-result-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    margin-bottom: 0.75rem;
    border-radius: 999px;
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent);
    font-weight: 700;
    font-size: 0.75rem;
    letter-spacing: 0.04em;
}

.file-result.is-target .file-result-icon {
    background: rgba(34, 197, 94, 0.15);
    color: #22c55e;
}

.file-result.is-output .file-result-icon {
    width: 3.5rem;
    height: 3.5rem;
    font-size: 0.85rem;
}

.file-result-title {
    margin: 0 0 0.35rem;
    font-size: 1rem;
    font-weight: 600;
}

.file-result-name {
    margin: 0;
    color: var(--text);
    font-size: 0.92rem;
    word-break: break-all;
}

.file-result-meta {
    margin: 0.65rem 0 0;
    color: var(--muted);
    font-size: 0.85rem;
}

.result-details {
    margin-top: 1.5rem;
}

.result-details dl {
    display: grid;
    grid-template-columns: minmax(8rem, auto) 1fr;
    gap: 0.5rem 1rem;
    margin: 0;
}

.result-details dt {
    margin: 0;
    color: var(--muted);
    font-size: 0.85rem;
}

.result-details dd {
    margin: 0;
    font-size: 0.92rem;
}

/* Merge precheck */
.config-grid {
    display: grid;
    grid-template-columns: minmax(16rem, 22rem) 1fr;
    align-items: start;
    gap: 1rem;
}

@media (max-width: 767px) {
    .config-grid {
        grid-template-columns: 1fr;
    }
}

.precheck-hierarchy-scroll {
    height: 90vh;
    max-height: 90vh;
    overflow-y: auto;
    margin-top: 0.75rem;
    border: 1px solid var(--panel-border);
    border-radius: 0.75rem;
    background: #ffffff;
}

.precheck-mapping-select {
    width: auto;
    min-width: 6rem;
}

.precheck-source-removed > td,
.precheck-remove > td {
    background-color: rgba(239, 68, 68, 0.15) !important;
}

.precheck-depth-mismatch > td,
.precheck-warn > td {
    background-color: rgba(234, 179, 8, 0.12) !important;
}

.precheck-target-new > td,
.precheck-insert > td {
    background-color: rgba(34, 197, 94, 0.12) !important;
}

.precheck-merge > td {
    background-color: rgba(253, 224, 71, 0.22) !important;
}

.precheck-void > td {
    background-color: rgba(148, 163, 184, 0.18) !important;
}

.precheck-summary-remove {
    background-color: rgba(239, 68, 68, 0.15) !important;
}

.precheck-summary-insert {
    background-color: rgba(34, 197, 94, 0.12) !important;
}

.precheck-summary-merge {
    background-color: rgba(253, 224, 71, 0.22) !important;
}

.precheck-summary-warn {
    background-color: rgba(234, 179, 8, 0.12) !important;
}

.precheck-summary-void {
    background-color: rgba(148, 163, 184, 0.18) !important;
}

.precheck-cell-label {
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.precheck-index-col {
    width: 3rem;
}

.precheck-cell-inner {
    position: relative;
    padding-right: 4.5rem;
    min-height: 1.25rem;
}

.precheck-row-action {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    line-height: 1.2;
    white-space: nowrap;
}

.precheck-table tbody tr:hover .precheck-row-action {
    opacity: 1;
}

.precheck-table.precheck-rematching tbody tr .precheck-row-action {
    opacity: 0;
    pointer-events: none;
}

.precheck-pending > td {
    box-shadow: inset 0 0 0 1px var(--accent);
}

.precheck-manual-paired > td {
    background-color: rgba(253, 224, 71, 0.22) !important;
    box-shadow: inset 0 0 0 1px rgba(59, 130, 246, 0.35);
}

@media (prefers-color-scheme: light) {
    :root {
        --bg: #f4f7fb;
        --panel: #ffffff;
        --panel-border: #cbd5e1;
        --text: #0f172a;
        --muted: #64748b;
        --danger-bg: #fee2e2;
        --danger-text: #991b1b;
        --success-bg: #dcfce7;
        --success-text: #166534;
        --warning-bg: #fef9c3;
        --warning-text: #854d0e;
    }

    body {
        background:
            radial-gradient(circle at top, rgba(59, 130, 246, 0.12), transparent 45%),
            var(--bg);
    }

    .drop-zone:hover,
    .drop-zone:focus-visible,
    .drop-zone.drag-over {
        background: #f8fbff;
    }

    .precheck-source-removed > td,
    .precheck-remove > td {
        background-color: #ffe8e8 !important;
    }

    .precheck-depth-mismatch > td,
    .precheck-warn > td {
        background-color: #fff8dc !important;
    }

    .precheck-target-new > td,
    .precheck-insert > td {
        background-color: #e8ffe8 !important;
    }

    .precheck-merge > td {
        background-color: #fef9c3 !important;
    }

    .precheck-void > td {
        background-color: #e2e8f0 !important;
    }

    .precheck-summary-remove {
        background-color: #ffe8e8 !important;
    }

    .precheck-summary-insert {
        background-color: #e8ffe8 !important;
    }

    .precheck-summary-merge {
        background-color: #fef9c3 !important;
    }

    .precheck-summary-warn {
        background-color: #fff8dc !important;
    }

    .precheck-summary-void {
        background-color: #e2e8f0 !important;
    }

    .precheck-manual-paired > td {
        background-color: #fef9c3 !important;
        box-shadow: inset 0 0 0 1px rgba(59, 130, 246, 0.35);
    }

    .merge-surface .precheck-source-removed > td,
    .merge-surface .precheck-remove > td {
        background-color: #ffe8e8 !important;
    }

    .merge-surface .precheck-depth-mismatch > td,
    .merge-surface .precheck-warn > td {
        background-color: #fff8dc !important;
    }

    .merge-surface .precheck-target-new > td,
    .merge-surface .precheck-insert > td {
        background-color: #e8ffe8 !important;
    }

    .merge-surface .precheck-merge > td {
        background-color: #fef9c3 !important;
    }

    .merge-surface .precheck-void > td {
        background-color: #e2e8f0 !important;
    }

    .merge-surface .precheck-manual-paired > td {
        background-color: #fef9c3 !important;
        box-shadow: inset 0 0 0 1px rgba(59, 130, 246, 0.35);
    }
}