:root {
    color-scheme: light;
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-muted: #f8fafc;
    --surface-strong: #eef3f8;
    --input-bg: #ffffff;
    --viewer-bg: #ffffff;
    --code-bg: #eef3f8;
    --relation-add-bg: #eff6ff;
    --text: #162033;
    --muted: #617083;
    --border: #d8e0ea;
    --border-strong: #b9c6d4;
    --accent: #2563eb;
    --accent-strong: #1d4ed8;
    --accent-soft: #dbeafe;
    --accent-soft-text: #1d4ed8;
    --warning: #b45309;
    --danger: #b91c1c;
    --button-primary-text: #ffffff;
    --focus-ring: rgba(37, 99, 235, 0.18);
    --relation-color-primary: #ff6f00;
    --relation-color-secondary: #0080ff;
    --shadow: 0 14px 35px rgba(15, 23, 42, 0.08);
    --radius: 8px;
    --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo,
        monospace;
    --ui: Inter, "Segoe UI", system-ui, -apple-system,
        BlinkMacSystemFont, sans-serif;
}

body[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0f172a;
    --surface: #172033;
    --surface-muted: #111827;
    --surface-strong: #22304a;
    --button-bg: #263653;
    --button-hover-bg: #30466d;
    --input-bg: #0b1120;
    --viewer-bg: #0b1120;
    --code-bg: #22304a;
    --relation-add-bg: #172554;
    --text: #e5edf7;
    --muted: #a8b3c5;
    --border: #334155;
    --border-strong: #526176;
    --accent: #60a5fa;
    --accent-strong: #93c5fd;
    --accent-soft: #1e3a5f;
    --accent-soft-text: #bfdbfe;
    --warning: #fbbf24;
    --danger: #f87171;
    --button-primary-text: #08111f;
    --focus-ring: rgba(96, 165, 250, 0.24);
    --relation-color-primary: #fbbf24;
    --relation-color-secondary: #86efac;
    --shadow: 0 16px 38px rgba(0, 0, 0, 0.32);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--ui);
    font-size: 15px;
    line-height: 1.45;
}

button,
input,
textarea,
summary {
    font: inherit;
}

button,
input[type="button"] {
    min-height: 34px;
    border: 1px solid var(--border-strong);
    border-radius: 6px;
    background: var(--button-bg, var(--surface));
    color: var(--text);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 650;
    padding: 0.45rem 0.72rem;
    transition:
        background 0.15s ease,
        border-color 0.15s ease,
        box-shadow 0.15s ease,
        transform 0.15s ease;
}

button:hover:not(:disabled),
input[type="button"]:hover:not(:disabled) {
    border-color: var(--accent);
    background: var(--button-hover-bg, var(--button-bg, var(--surface)));
    box-shadow: 0 3px 10px rgba(37, 99, 235, 0.14);
    transform: translateY(-1px);
}

button:disabled,
input[type="button"]:disabled {
    cursor: not-allowed;
    opacity: 0.48;
}

input[type="text"],
input[type="file"],
textarea {
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--input-bg);
    color: var(--text);
}

input[type="text"] {
    min-height: 32px;
    padding: 0.32rem 0.45rem;
}

input[type="checkbox"],
input[type="radio"] {
    accent-color: var(--accent);
}

textarea {
    width: 100%;
    min-height: 8.5rem;
    margin-top: 0.35rem;
    padding: 0.65rem 0.75rem;
    resize: vertical;
    font-family: var(--mono);
    font-size: 0.92rem;
    line-height: 1.45;
}

a {
    color: var(--accent-strong);
}

.app-shell {
    width: min(100% - 32px, 1280px);
    margin: 0 auto;
    padding: 26px 0 30px;
}

.app-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 18px;
}

.header-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.theme-toggle {
    min-width: 7.5rem;
    white-space: nowrap;
}

.app-title {
    margin: 0;
    font-size: clamp(1.6rem, 3vw, 2.35rem);
    line-height: 1.05;
    letter-spacing: 0;
}

.app-subtitle {
    max-width: 62ch;
    margin: 0.45rem 0 0;
    color: var(--muted);
}

.status-text {
    color: var(--danger);
    font-family: var(--mono);
    font-size: 0.88rem;
    font-weight: 700;
}

.panel {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
}

.codetext {
    font-family: var(--mono);
}

.relationRow {
    cursor: pointer;
    border-left: 3px solid transparent;
    padding: 0.28rem 0.45rem;
}

.relationRow:hover {
    background: var(--surface-strong);
}

.selectedRelationRow {
    border-left-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent-soft-text) !important;
    font-weight: 700;
}

#midCol {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 14px 0;
}

.action-help {
    flex: 1;
    color: var(--muted);
    font-size: 0.92rem;
}

.button-primary {
    border-color: var(--accent);
    background: var(--accent);
    color: var(--button-primary-text);
    font-size: 1rem;
}

.button-primary:hover:not(:disabled) {
    border-color: var(--accent-strong);
    background: var(--accent-strong);
}

.accordionGroup {
    width: 100%;
    overflow: hidden;
}

.accordionTrigger {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.accordionLabel {
    display: flex;
    cursor: pointer;
    padding: 0.85rem 1rem;
    font-weight: 800;
    background-color: var(--surface-strong);
    user-select: none;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
}

.accordionLabel::after {
    content: "\276F";
    width: 1em;
    height: 1em;
    text-align: center;
    transform: rotate(90deg);
    transition: transform 0.2s ease;
}

.accordionPanel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
}

.accordionTrigger:checked + .accordionLabel + .accordionPanel {
    max-height: 38rem;
}

.accordionTrigger:checked + .accordionLabel::after {
    transform: rotate(270deg);
}

#inputArea {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
    gap: 1rem;
    padding: 1rem;
    align-items: start;
}

#controlOpt {
    grid-column: 1 / -1;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface-muted);
}

.field-block {
    min-width: 0;
}

.field-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.25rem;
}

.field-label {
    color: var(--text);
    font-weight: 800;
}

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

#cytoCol {
    min-width: 0;
    margin: 0;
    padding: 1rem;
}

#cytoCol legend {
    padding: 0 0.45rem;
    font-weight: 850;
}

#outputDiv {
    display: grid;
    grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
    gap: 0.75rem;
    margin-top: 1rem;
}

#viewer {
    min-width: 0;
    height: clamp(420px, 62vh, 760px);
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--viewer-bg);
}

.cy_canvas {
    width: 100%;
    height: 100%;
    display: block;
}

#relOutput {
    min-width: 150px;
    min-height: 100%;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-muted);
    font-family: var(--mono);
    color: var(--text);
    font-size: 0.92rem;
    resize: horizontal;
    overflow: auto;
    padding: 0.65rem;
}

#relOutput.add-relation-mode {
    border-color: var(--accent);
    background: var(--relation-add-bg);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.16);
}

.relation-editor {
    min-height: 5.5rem;
    margin-top: 0.6rem;
    border: 1px dashed var(--accent);
    border-radius: 6px;
    background: var(--input-bg);
    color: var(--text) !important;
    padding: 0.55rem;
    outline: none;
    white-space: pre-wrap;
}

.relation-editor:focus {
    border-style: solid;
    box-shadow: 0 0 0 2px var(--focus-ring);
}

.relation-editor:empty::before {
    content: "Type new relation(s). Use one relation per line, or separate relations with commas.";
    color: var(--muted);
    pointer-events: none;
}

#outTxtBox {
    min-height: 100%;
    max-height: 11.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.75rem;
    background: var(--surface-muted);
    overflow-y: auto;
    overflow-wrap: break-word;
    font-family: var(--mono);
    font-size: 0.9rem;
}

#relOutput div:nth-child(2n + 1) {
    color: var(--relation-color-secondary);
}

#relOutput div:nth-child(2n) {
    color: var(--relation-color-primary);
}

.control-group {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(250px, 25em);
    gap: 0.85rem;
    margin-bottom: 0.75rem;
}

.control-panel {
    display: flex;
    flex-direction: row;
    gap: 0.75rem;
    flex-wrap: wrap;
    align-items: stretch;
}

.control-group details,
.control-group .control-box {
    border: 1px solid var(--border);
    padding: 0.75rem;
    background: var(--surface-muted);
    border-radius: var(--radius);
}

.control-title,
.control-group summary {
    color: var(--text);
    cursor: pointer;
    font-size: 0.88rem;
    font-weight: 850;
    margin-bottom: 0.55rem;
}

.control-stack {
    display: grid;
    gap: 0.45rem;
}

.option-list {
    display: grid;
    gap: 0.35rem;
}

.indented-option {
    margin-left: 1.45rem;
}

.help-panel {
    margin-top: 16px;
    padding: 0.9rem 1rem;
}

.help-panel summary {
    cursor: pointer;
    font-weight: 850;
}

.help-content {
    display: grid;
    gap: 0.8rem;
    margin-top: 0.8rem;
    color: var(--muted);
}

.help-section {
    display: grid;
    gap: 0.35rem;
}

.help-section-title {
    color: var(--text);
    font-weight: 850;
}

.help-content .codetext {
    color: var(--text);
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.05rem 0.25rem;
    overflow-wrap: anywhere;
}

.help-content .code-block {
    display: block;
    margin: 0.35rem 0;
    padding: 0.35rem 0.45rem;
}

@media (max-width: 840px) {
    .app-shell {
        width: min(100% - 20px, 1280px);
        padding-top: 18px;
    }

    .app-header,
    #midCol,
    .control-group {
        align-items: stretch;
        flex-direction: column;
        grid-template-columns: 1fr;
    }

    #inputArea,
    #outputDiv {
        grid-template-columns: 1fr;
    }

    #relOutput {
        min-height: 9rem;
        resize: vertical;
    }
}