:root {
    --bg: #f2f4f8;
    --bg-soft: #e7ebf3;
    --panel: #ffffff;
    --text: #1f2a37;
    --muted: #5b6a7a;
    --line: #d7deea;
    --brand: #0052cc;
    --brand-2: #2a7fff;
    --danger: #c0392b;
    --ok: #1e7e34;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body,
#root {
    width: 100%;
    min-height: 100%;
}

body {
    font-family: "Segoe UI", "Helvetica Neue", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 0% 0%, #ffffff 0%, transparent 45%),
        radial-gradient(circle at 100% 100%, #e7eefc 0%, transparent 50%),
        var(--bg);
}

.app-shell {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
}

.sidebar {
    border-right: 1px solid var(--line);
    background: linear-gradient(160deg, #0d1b2a 0%, #1c2b3f 100%);
    color: #f2f6ff;
    padding: 24px 16px;
}

.brand {
    font-size: 1.05rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 2px;
}

.brand-sub {
    color: #bbcbdf;
    font-size: 0.85rem;
    margin-bottom: 20px;
}

.menu-title {
    color: #9eb1c7;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 10px;
}

.menu {
    display: grid;
    gap: 8px;
}

.menu-btn {
    width: 100%;
    text-align: left;
    border: 1px solid transparent;
    background: transparent;
    color: #dbe7f4;
    padding: 10px 12px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
}

.menu-btn:hover {
    background: rgba(255, 255, 255, 0.08);
}

.menu-btn.active {
    border-color: rgba(255, 255, 255, 0.26);
    background: rgba(42, 127, 255, 0.28);
}

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

.content {
    padding: 28px;
}

.content-topbar {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 12px;
}

.help-cta {
    border: 1px solid rgba(0, 82, 204, 0.16);
    background: linear-gradient(135deg, #fefefe, #eaf2ff);
    color: #123b78;
    padding: 10px 14px;
    border-radius: 999px;
    cursor: pointer;
    font-weight: 700;
    box-shadow: 0 10px 24px rgba(0, 82, 204, 0.12);
}

.help-cta:hover {
    background: linear-gradient(135deg, #ffffff, #dfeaff);
}

.help-modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(13, 27, 42, 0.48);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 28px;
    z-index: 50;
}

.help-modal {
    width: min(980px, 100%);
    max-height: calc(100vh - 56px);
    overflow: auto;
    background: #ffffff;
    border: 1px solid rgba(18, 59, 120, 0.12);
    border-radius: 20px;
    padding: 22px;
    box-shadow: 0 28px 60px rgba(10, 26, 54, 0.22);
}

.help-modal-header {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 16px;
}

.help-eyebrow {
    color: var(--brand);
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 6px;
}

.help-close {
    border: 1px solid var(--line);
    background: #f6f9ff;
    color: #1f3154;
    padding: 9px 12px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 700;
}

.help-current-banner {
    margin-bottom: 14px;
    padding: 10px 12px;
    border-radius: 12px;
    background: #eef4ff;
    border: 1px solid #d6e3ff;
    color: #17376a;
}

.help-section-list {
    display: grid;
    gap: 14px;
}

.help-doc-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 16px;
}

.help-doc-nav {
    border-right: 1px solid var(--line);
    padding-right: 14px;
}

.help-doc-nav-list {
    display: grid;
    gap: 8px;
}

.help-doc-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    width: 100%;
    text-align: left;
    border: 1px solid var(--line);
    background: #f8fbff;
    color: #20344c;
    padding: 10px 12px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
}

.help-doc-link.active {
    border-color: #9cc0ff;
    background: #eef4ff;
}

.help-doc-page {
    min-width: 0;
}

.help-detail-list {
    display: grid;
    gap: 10px;
}

.help-detail-card {
    border: 1px solid #dce6f4;
    background: #ffffff;
    border-radius: 12px;
    padding: 12px;
}

.help-detail-title {
    font-weight: 700;
    color: #163864;
    margin-bottom: 6px;
}

.help-detail-meta {
    margin-top: 6px;
    color: #445a74;
    font-size: 0.9rem;
}

.help-section {
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 16px;
    background: #fbfdff;
}

.help-section.active {
    border-color: #9cc0ff;
    background: linear-gradient(180deg, #f6faff 0%, #fbfdff 100%);
    box-shadow: inset 0 0 0 1px rgba(42, 127, 255, 0.16);
}

.help-section-head {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
    margin-bottom: 8px;
}

.help-chip {
    padding: 5px 10px;
    border-radius: 999px;
    background: #dceaff;
    color: #0d47a1;
    font-size: 0.78rem;
    font-weight: 700;
}

.help-lead {
    color: #2a3f57;
    margin-bottom: 10px;
}

.help-block+.help-block {
    margin-top: 10px;
}

.help-label {
    color: var(--muted);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 5px;
}

.help-list {
    margin-left: 18px;
    display: grid;
    gap: 5px;
    color: #22344b;
    line-height: 1.45;
}

.help-list-ordered {
    list-style: decimal;
}

.content-header {
    margin-bottom: 18px;
}

.title {
    font-size: 1.4rem;
    line-height: 1.2;
}

.subtitle {
    color: var(--muted);
    margin-top: 6px;
    font-size: 0.95rem;
}

.subtitle.compact {
    margin-top: 0;
    margin-bottom: 10px;
}

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 14px;
    box-shadow: 0 5px 14px rgba(21, 33, 56, 0.06);
}

.panel h3 {
    font-size: 0.98rem;
    margin-bottom: 8px;
}

.panel-kicker {
    color: var(--brand);
    font-size: 0.76rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 6px;
}

.field {
    display: grid;
    gap: 6px;
    margin-bottom: 10px;
}

.label {
    color: var(--muted);
    font-size: 0.85rem;
}

.field-hint {
    color: #54657a;
    font-size: 0.82rem;
    line-height: 1.4;
}

textarea,
select,
input {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 10px;
    font: inherit;
    color: var(--text);
    background: #fff;
}

textarea {
    min-height: 210px;
    font-family: Consolas, Monaco, monospace;
    resize: vertical;
}

.actions {
    display: flex;
    gap: 10px;
    align-items: center;
    margin: 8px 0 12px;
}

.btn {
    border: none;
    background: linear-gradient(130deg, var(--brand), var(--brand-2));
    color: #fff;
    padding: 10px 14px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 700;
}

.btn.secondary {
    background: #dfe8f9;
    color: #1f3154;
}

.btn-link {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
}

.examples-inline {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.status {
    padding: 9px 11px;
    border-radius: 9px;
    margin-bottom: 10px;
    border: 1px solid transparent;
    font-size: 0.9rem;
}

.status.error {
    color: var(--danger);
    background: #fdecec;
    border-color: #f5c2be;
}

.status.ok {
    color: var(--ok);
    background: #ecf9ef;
    border-color: #bfe5c8;
}

.result {
    white-space: pre-wrap;
    overflow: auto;
    min-height: 210px;
    max-height: 420px;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 10px;
    background: #fbfdff;
    font-family: Consolas, Monaco, monospace;
    font-size: 0.88rem;
}

.trace-list {
    max-height: 420px;
    overflow: auto;
    display: grid;
    gap: 6px;
}

.trace-item {
    font-family: Consolas, Monaco, monospace;
    background: var(--bg-soft);
    border: 1px solid #d4dcec;
    border-radius: 9px;
    padding: 8px;
    font-size: 0.82rem;
    line-height: 1.35;
}

.examples-panel {
    margin-top: 16px;
}

.examples-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.example-code {
    margin-top: 6px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #f8fbff;
    padding: 10px;
    font-family: Consolas, Monaco, monospace;
    font-size: 0.82rem;
    line-height: 1.35;
    max-height: 260px;
    overflow: auto;
    white-space: pre-wrap;
}

.trace-item.trace-tms {
    background: #e8f5e9;
    border-color: #a5d6a7;
    color: #1b5e20;
    font-weight: 600;
}

.trace-item.trace-profile {
    background: #e3f2fd;
    border-color: #90caf9;
    color: #0d47a1;
    font-weight: 600;
}

.trace-item.trace-warn {
    background: #fff8e1;
    border-color: #ffe082;
    color: #e65100;
}

.runtime-guide-panel {
    margin-bottom: 16px;
}

.runtime-step-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-top: 12px;
}

.runtime-step-card {
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 10px;
    align-items: start;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fbfdff;
}

.runtime-step-card.active {
    border-color: #9cc0ff;
    background: #eef6ff;
}

.runtime-step-index {
    width: 42px;
    height: 42px;
    border-radius: 999px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #dceaff;
    color: #0d47a1;
    font-weight: 800;
}

.runtime-step-title {
    font-weight: 700;
    margin-bottom: 4px;
}

.runtime-step-text {
    color: #475a72;
    font-size: 0.88rem;
    line-height: 1.4;
}

.debug-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.debug-table th,
.debug-table td {
    padding: 7px 10px;
    border-bottom: 1px solid var(--line);
    text-align: left;
}

.dt-key {
    color: var(--muted);
    width: 44%;
    font-weight: 600;
}

.dt-val {
    font-family: Consolas, Monaco, monospace;
    word-break: break-all;
}

.dt-highlight {
    color: var(--brand);
    font-weight: 700;
}

.operator-list {
    margin-top: 6px;
    margin-left: 18px;
    display: grid;
    gap: 6px;
    color: #2b3c52;
    font-size: 0.9rem;
}

.literal-reading {
    margin-top: 12px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #fdfefe;
}

.literal-list {
    margin-top: 8px;
    margin-left: 18px;
    display: grid;
    gap: 6px;
    color: #22344b;
    font-size: 0.9rem;
    line-height: 1.4;
}

.udl-editor-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.udl-manager-grid {
    display: grid;
    grid-template-columns: minmax(220px, 320px) 1fr;
    gap: 14px;
}

.udl-list-panel {
    display: grid;
    gap: 8px;
    max-height: 420px;
    overflow: auto;
    padding-right: 2px;
}

.udl-list-item {
    display: grid;
    gap: 2px;
    text-align: left;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #f8fbff;
    color: #24374f;
    padding: 10px;
    cursor: pointer;
}

.udl-list-item strong {
    color: #1e2f48;
}

.udl-list-item span {
    font-size: 0.84rem;
    color: #51657f;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.udl-list-item.active {
    border-color: #8eb7ff;
    background: #edf5ff;
}

.udl-rule-form-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
}

.rule-tree-root {
    display: grid;
    gap: 10px;
    margin-top: 10px;
}

.rule-node {
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #f9fbff;
    padding: 10px;
}

.rule-node.drag-over {
    border-color: #6aa3ff;
    box-shadow: inset 0 0 0 1px rgba(42, 127, 255, 0.25);
}

.rule-node-condition {
    background: #ffffff;
}

.rule-node-head {
    display: grid;
    grid-template-columns: auto minmax(180px, 1fr) auto minmax(180px, 1fr) minmax(180px, 1fr) auto;
    gap: 8px;
    align-items: center;
}

.rule-node-head-group {
    grid-template-columns: auto auto auto minmax(190px, 1fr) auto auto auto;
}

.rule-node-head-condition {
    grid-template-columns: auto minmax(170px, 1fr) auto minmax(150px, 1fr) minmax(170px, 1fr) auto;
}

.draggable-handle {
    cursor: grab;
}

.draggable-handle:active {
    cursor: grabbing;
}

.rule-node-badge {
    font-size: 0.75rem;
    font-weight: 700;
    color: #0f4a9f;
    background: #deebff;
    border: 1px solid #c2dafd;
    border-radius: 999px;
    padding: 3px 8px;
}

.rule-node-children {
    display: grid;
    gap: 8px;
    margin-top: 8px;
}

.udl-chip-list {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.udl-chip-active {
    border: 1px solid var(--brand);
    box-shadow: inset 0 0 0 1px rgba(0, 82, 204, 0.25);
}

.udl-stack {
    display: grid;
    gap: 10px;
}

.udl-container-row,
.udl-rule-row {
    display: grid;
    gap: 8px;
    align-items: center;
}

.udl-container-row {
    grid-template-columns: 110px 1fr auto auto;
}

.udl-rule-row {
    grid-template-columns: 170px 120px 1fr 220px auto;
}

.runtime-panel,
.domain-panel,
.event-panel {
    grid-column: auto;
    order: 0;
}

.runtime-lab-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.runtime-step-panel {
    align-self: start;
}

.status-inline-list {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.tab-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tab-btn {
    border: 1px solid var(--line);
    background: #eef3fb;
    color: #1f3154;
    padding: 8px 12px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
}

.tab-btn.active {
    background: linear-gradient(130deg, var(--brand), var(--brand-2));
    color: #fff;
    border-color: transparent;
}

.udl-click-playground {
    display: grid;
    gap: 8px;
    padding: 10px;
    border: 1px dashed var(--line);
    border-radius: 10px;
    background: #f9fbff;
}

.udl-click-playground a,
.udl-click-playground button {
    display: inline-flex;
    width: fit-content;
    gap: 6px;
    align-items: center;
    text-decoration: none;
}

@media (max-width: 980px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--line);
    }

    .grid {
        grid-template-columns: 1fr;
    }

    .examples-grid {
        grid-template-columns: 1fr;
    }

    .help-doc-layout,
    .runtime-step-grid {
        grid-template-columns: 1fr;
    }

    .help-doc-nav {
        border-right: none;
        padding-right: 0;
    }

    .udl-editor-grid {
        grid-template-columns: 1fr;
    }

    .udl-manager-grid,
    .udl-rule-form-grid,
    .rule-node-head {
        grid-template-columns: 1fr;
    }

    .udl-container-row,
    .udl-rule-row {
        grid-template-columns: 1fr;
    }

    .help-modal-backdrop {
        padding: 14px;
    }

    .help-modal-header,
    .help-section-head {
        flex-direction: column;
        align-items: flex-start;
    }

    .runtime-lab-grid {
        grid-template-columns: 1fr;
    }

    .runtime-panel,
    .domain-panel {
        grid-column: auto;
    }
}

.code-editor-shell {
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #ffffff;
    overflow: hidden;
}

.code-editor-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    padding: 8px;
    border-bottom: 1px solid var(--line);
    background: #f7faff;
}

.code-editor-meta {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
}

.code-editor-chip {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 999px;
    background: #e3ecfb;
    color: #1e3b64;
    border: 1px solid #c8d8f7;
}

.code-editor-chip.ok {
    background: #e8f7ec;
    color: #19652b;
    border-color: #b9e3c5;
}

.code-editor-chip.warn {
    background: #fff4e5;
    color: #8b4c0a;
    border-color: #ffd19a;
}

.code-editor-surface {
    width: 100%;
}

.source-editor-panel,
.source-history-panel {
    padding: 12px;
}

.source-toolbar {
    display: grid;
    grid-template-columns: minmax(260px, 360px) 1fr;
    gap: 10px;
    align-items: end;
    margin-bottom: 8px;
}

.source-toolbar-secondary {
    grid-template-columns: minmax(180px, 260px) 1fr;
    margin-bottom: 8px;
}

.source-actions {
    justify-content: flex-end;
    flex-wrap: wrap;
}

.source-meta-details {
    margin-bottom: 8px;
}

.source-meta-details summary {
    cursor: pointer;
    color: #3a4f69;
    font-size: 0.83rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.source-meta-inline {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px 12px;
    font-size: 0.78rem;
    color: #394b60;
    background: #f8fbff;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 8px;
}

.source-compare-toolbar {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 10px;
    align-items: end;
    margin-bottom: 8px;
}

.source-diff-stats {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    font-size: 0.82rem;
    color: #2f4661;
    margin-bottom: 8px;
}

.source-diff-table {
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: auto;
    max-height: 340px;
    background: #fbfdff;
}

.source-diff-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-bottom: 1px solid #e3e9f3;
}

.source-diff-row:last-child {
    border-bottom: none;
}

.source-diff-cell {
    border-right: 1px solid #e3e9f3;
    padding: 6px 8px;
}

.source-diff-cell:last-child {
    border-right: none;
}

.source-diff-cell pre {
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word;
    font-family: Consolas, Monaco, monospace;
    font-size: 0.8rem;
    line-height: 1.35;
    min-height: 20px;
}

.source-diff-line-header {
    color: #5a6c80;
    font-size: 0.72rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.source-diff-cell.added {
    background: #eaf8ed;
}

.source-diff-cell.removed {
    background: #fdeeee;
}

.source-diff-cell.changed {
    background: #fff8e7;
}

.source-diff-cell.empty {
    background: #f7f9fc;
}