:root {
    color-scheme: light;
    --bg: #edf1f5;
    --panel: #ffffff;
    --panel-soft: #f6f8fb;
    --text: #18212f;
    --muted: #667085;
    --border: #d7dde5;
    --border-strong: #aeb8c5;
    --accent: #176b5c;
    --accent-dark: #0f4f44;
    --accent-soft: #e8f3ef;
    --blue: #315f9f;
    --blue-soft: #edf3fb;
    --danger: #b42318;
    --danger-bg: #fff1f0;
    --success-bg: #eaf7f3;
    --shadow: 0 1px 2px rgba(17, 24, 39, 0.05), 0 12px 28px rgba(17, 24, 39, 0.07);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.5;
}

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

.shell {
    width: min(1500px, calc(100% - 28px));
    margin: 16px auto 28px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.86);
    box-shadow: 0 1px 2px rgba(17, 24, 39, 0.04);
    margin-bottom: 12px;
    padding: 12px 14px;
}

.topbar h1 {
    max-width: 860px;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 16px;
}

.stack {
    display: grid;
    gap: 14px;
}

.detail-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
    gap: 18px;
    align-items: start;
}

.analysis-layout {
    display: grid;
    grid-template-columns: minmax(280px, 0.82fr) minmax(480px, 1.32fr) minmax(310px, 0.86fr);
    gap: 12px;
    align-items: start;
}

.tree-sidebar {
    position: sticky;
    top: 12px;
    max-height: calc(100vh - 24px);
    overflow: hidden;
}

.info-sidebar {
    position: sticky;
    top: 12px;
    max-height: calc(100vh - 24px);
    overflow: auto;
}

.board-workbench {
    min-height: calc(100vh - 112px);
}

.split-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.subpanel {
    display: grid;
    gap: 12px;
    border-top: 1px solid var(--border);
    padding-top: 16px;
}

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

.count-pill {
    min-width: 30px;
    border-radius: 999px;
    background: var(--blue-soft);
    color: var(--blue);
    font-size: 13px;
    font-weight: 700;
    padding: 3px 9px;
    text-align: center;
}

h1,
h2,
h3 {
    margin: 0;
    color: var(--text);
    font-weight: 760;
}

h1 {
    font-size: 24px;
    line-height: 1.15;
}

h2 {
    font-size: 16px;
}

h3 {
    font-size: 16px;
}

p {
    margin: 4px 0 0;
    color: var(--muted);
}

.status,
.flash,
.error-summary {
    border: 1px solid #b8e2d5;
    border-left: 4px solid var(--accent);
    border-radius: 8px;
    background: var(--success-bg);
    color: #134e45;
    padding: 12px 14px;
    margin: 0 0 18px;
}

.flash.error,
.error-summary {
    border-color: #f3b7b1;
    border-left-color: var(--danger);
    background: var(--danger-bg);
    color: var(--danger);
}

.button,
button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    border: 1px solid var(--accent);
    border-radius: 7px;
    background: var(--accent);
    color: #ffffff;
    font: inherit;
    font-weight: 700;
    text-decoration: none;
    padding: 7px 12px;
    cursor: pointer;
}

.button:hover,
button:hover {
    border-color: var(--accent-dark);
    background: var(--accent-dark);
}

.button.secondary {
    background: #ffffff;
    color: var(--accent-dark);
}

.button.secondary:hover {
    background: var(--accent-soft);
}

.danger-button {
    border-color: var(--danger);
    background: var(--danger);
}

.danger-button:hover {
    border-color: #8f1d14;
    background: #8f1d14;
}

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    border-bottom: 1px solid var(--border);
    padding: 11px 8px;
    text-align: left;
    vertical-align: top;
}

th {
    color: var(--muted);
    font-size: 12px;
    font-weight: 760;
    text-transform: uppercase;
}

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

.plain-text {
    color: var(--text);
    white-space: normal;
}

.meta-list {
    display: grid;
    gap: 0;
    margin: 0;
}

.meta-list div {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 12px;
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
}

.meta-list div:first-child {
    padding-top: 0;
}

.meta-list dt {
    color: var(--muted);
    font-weight: 700;
}

.meta-list dd {
    margin: 0;
}

.empty {
    border: 1px dashed var(--border-strong);
    border-radius: 8px;
    background: var(--panel-soft);
    color: var(--muted);
    padding: 18px;
}

.empty.compact {
    padding: 12px;
}

.move-preview {
    display: grid;
    gap: 10px;
}

.move-preview-summary,
.selected-position,
.selected-note-move,
.selected-analysis-fen {
    display: grid;
    gap: 6px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--panel-soft);
    padding: 10px;
}

.move-preview-summary span,
.selected-position span,
.selected-note-move {
    color: var(--muted);
}

.move-preview-summary span,
.selected-position code,
.selected-analysis-fen code {
    overflow-wrap: anywhere;
}

.move-preview-list,
.saved-move-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.move-preview-list li,
.saved-move-list li {
    border: 1px solid var(--border);
    border-radius: 7px;
    background: #ffffff;
    padding: 6px 8px;
}

.saved-move-list li {
    display: inline-flex;
    align-items: baseline;
    gap: 5px;
}

.saved-move-list small {
    color: var(--muted);
}

.move-tree {
    display: grid;
    gap: 5px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.move-tree-scroll {
    max-height: min(74vh, 820px);
    overflow: auto;
    padding: 8px 6px 2px 0;
    scrollbar-width: thin;
}

.move-tree .move-tree {
    border-left: 2px solid #e5e9ef;
    margin: 5px 0 0 16px;
    padding-left: 9px;
}

.move-tree li {
    display: grid;
    gap: 8px;
}

.move-node {
    display: grid;
    grid-template-columns: 58px minmax(max-content, 1fr) auto;
    justify-content: flex-start;
    align-items: center;
    width: 100%;
    min-width: max-content;
    min-height: 32px;
    gap: 8px;
    border-color: var(--border);
    background: #fbfcfd;
    color: var(--text);
    font-weight: 500;
    padding: 5px 8px;
    text-align: left;
    white-space: nowrap;
}

.move-node:hover,
.move-node:focus {
    border-color: var(--accent);
    background: var(--accent-soft);
}

.move-node.is-active {
    border-color: var(--accent);
    background: #dff0eb;
    color: var(--accent-dark);
    box-shadow: inset 3px 0 0 var(--accent);
}

.move-node.is-temporary {
    border-style: dashed;
    color: var(--blue);
}

.move-node .move-number,
.move-node small {
    color: var(--muted);
}

.move-node .move-number {
    font-variant-numeric: tabular-nums;
    font-weight: 800;
}

.move-node strong {
    font-weight: 760;
}

.board-shell {
    width: min(100%, 580px);
    aspect-ratio: 1;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    box-shadow: 0 10px 24px rgba(17, 24, 39, 0.10);
    margin: 6px auto 0;
    overflow: hidden;
}

.board-controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 14px;
}

.selected-position {
    margin-top: 14px;
}

.selected-line-start {
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    border-radius: 8px;
    background: var(--accent-soft);
    color: var(--accent-dark);
    font-weight: 700;
    padding: 9px 11px;
}

.selected-line-start.is-warning {
    border-left-color: var(--danger);
    background: var(--danger-bg);
    color: var(--danger);
}

.analysis-panel,
.analysis-result {
    display: grid;
    gap: 12px;
}

.analysis-list {
    display: grid;
    gap: 0;
    margin: 0;
}

.analysis-list div {
    border-bottom: 1px solid var(--border);
    display: grid;
    gap: 4px;
    padding: 9px 0;
}

.analysis-list div:first-child {
    padding-top: 0;
}

.analysis-list dt {
    color: var(--muted);
    font-weight: 700;
}

.analysis-list dd {
    margin: 0;
    overflow-wrap: anywhere;
}

form {
    display: grid;
    gap: 15px;
}

.form-row {
    display: grid;
    gap: 7px;
}

label,
.field-label {
    font-weight: 700;
}

input,
select,
textarea {
    width: 100%;
    border: 1px solid var(--border-strong);
    border-radius: 7px;
    background: #ffffff;
    color: var(--text);
    font: inherit;
    padding: 10px 11px;
}

input:focus,
select:focus,
textarea:focus,
button:focus,
.button:focus {
    outline: 2px solid rgba(15, 118, 110, 0.28);
    outline-offset: 2px;
}

textarea {
    min-height: 112px;
    resize: vertical;
}

.choice-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.choice-card {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 10px;
    align-items: start;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--panel-soft);
    cursor: pointer;
    padding: 12px;
}

.choice-card:focus-within {
    border-color: var(--accent);
    background: var(--accent-soft);
}

.choice-card:has(input:checked) {
    border-color: var(--accent);
    background: var(--accent-soft);
}

.choice-card input {
    width: auto;
    margin-top: 4px;
    accent-color: var(--accent);
}

.choice-card strong,
.choice-card small {
    display: block;
}

.choice-card small {
    color: var(--muted);
    font-weight: 400;
    margin-top: 2px;
}

.field-error {
    color: var(--danger);
    font-size: 14px;
}

.actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

code {
    background: #eef1f4;
    border-radius: 5px;
    padding: 2px 5px;
}

ol {
    padding-left: 22px;
    margin-bottom: 0;
}

button:disabled,
textarea:disabled {
    cursor: not-allowed;
    opacity: 0.65;
}

@media (max-width: 1120px) {
    .analysis-layout {
        grid-template-columns: minmax(240px, 0.9fr) minmax(360px, 1.1fr);
    }

    .tree-sidebar {
        position: static;
        max-height: none;
    }

    .info-sidebar {
        position: static;
        max-height: none;
    }

    .analysis-layout > aside:last-child {
        grid-column: 1 / -1;
    }
}

@media (max-width: 760px) {
    .shell {
        width: min(100% - 20px, 1440px);
        margin: 18px auto 28px;
    }

    .topbar,
    .detail-grid,
    .analysis-layout,
    .split-grid,
    .choice-grid {
        grid-template-columns: 1fr;
    }

    .topbar {
        display: grid;
    }

    .analysis-layout > aside:last-child {
        grid-column: auto;
    }

    .move-tree-scroll {
        max-height: 42vh;
        padding-top: 6px;
    }

    .move-node {
        grid-template-columns: 50px minmax(max-content, 1fr) auto;
        min-height: 32px;
        padding: 5px 8px;
    }

    .panel {
        padding: 16px;
    }

    h1 {
        font-size: 24px;
    }

    .meta-list div {
        grid-template-columns: 1fr;
        gap: 2px;
    }

    .board-controls {
        justify-content: flex-start;
    }
}