:root {
    --bg: #f6f8fa;
    --panel: #ffffff;
    --border: #d0d7de;
    --text: #24292f;
    --muted: #57606a;
    --accent: #0969da;
    --error-bg: #ffebe9;
    --error-border: #ff8182;
    --error-text: #cf222e;
    --ok-bg: #dafbe1;
    --ok-border: #81c995;
    --ok-text: #116329;
    --mono: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, "Liberation Mono", monospace;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0d1117;
        --panel: #161b22;
        --border: #30363d;
        --text: #e6edf3;
        --muted: #9da7b3;
        --accent: #58a6ff;
        --error-bg: #5a1e17;
        --error-border: #8e2f1e;
        --error-text: #ffb3a7;
        --ok-bg: #0f3a20;
        --ok-border: #1a6a38;
        --ok-text: #7ee787;
    }
}

@media (prefers-color-scheme: dark) {
    body.preview-body {
        background: var(--bg);
    }

    button {
        background: #21262d;
    }

    .action-link {
        background: #21262d;
    }

    .tabs {
        background: #21262d;
    }

    .tab[aria-selected="true"] {
        background: var(--panel);
        border-bottom-color: var(--panel);
    }

    .line-numbers {
        background: #0d1117;
    }

    .editor {
        background: #0d1117;
        color: var(--text);
    }

    iframe {
        background: var(--panel);
    }

    pre {
        background: var(--panel);
        color: var(--text);
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--sans);
    color: var(--text);
    background: var(--bg);
}

body.preview-body {
    margin: 0;
    padding: 14px;
    font-family: var(--sans);
    color: var(--text);
    background: var(--bg);
}
a svg {
    color: var(--text);
    vertical-align: text-bottom;
}

a svg:hover {
    color: var(--accent);
}

.shell {
    display: grid;
    grid-template-rows: auto auto 1fr;
    min-block-size: 100vh;
    gap: 12px;
    padding: 14px;
}

.header {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 14px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.title {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.01em;
}

.subtitle {
    margin: 2px 0 0;
    color: var(--muted);
    font-size: 13px;
}

.meta-links {
    margin: 8px 0 0;
}

.repo-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
}

.repo-link:hover {
    text-decoration: underline;
}

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

button {
    border: 1px solid var(--border);
    background: #f6f8fa;
    color: var(--text);
    font-family: var(--sans);
    border-radius: 8px;
    padding: 7px 11px;
    font-size: 13px;
    cursor: pointer;
}

.action-link {
    border: 1px solid var(--border);
    background: #f6f8fa;
    color: var(--text);
    font-family: var(--sans);
    border-radius: 8px;
    padding: 7px 11px;
    font-size: 13px;
    text-decoration: none;
    line-height: 1.2;
}

.action-link:hover {
    border-color: #8c959f;
}

@media (prefers-color-scheme: dark) {
    button,
    .action-link,
    .tabs {
        background: #21262d;
    }

    .tab[aria-selected="true"] {
        background: var(--panel);
        border-bottom-color: var(--panel);
    }

    .line-numbers,
    .editor {
        background: #0d1117;
    }

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

button:hover {
    border-color: #8c959f;
}

.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #ffffff;
}

.workspace {
    display: grid;
    grid-template-columns: minmax(300px, 42%) minmax(360px, 58%);
    gap: 12px;
    min-block-size: 0;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    min-block-size: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-head {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    font-size: 13px;
}

.editor-wrap {
    display: grid;
    grid-template-columns: auto 1fr;
    flex: 1;
    min-block-size: 280px;
    overflow: hidden;
}

.line-numbers {
    margin: 0;
    padding: 12px 8px 12px 12px;
    min-inline-size: 3.5em;
    border-right: 1px solid var(--border);
    background: #f6f8fa;
    color: var(--muted);
    text-align: right;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    font-family: var(--mono);
    font-size: 13px;
    line-height: 1.45;
    white-space: pre;
    overflow: hidden;
}

.editor {
    inline-size: 100%;
    flex: 1;
    block-size: 100%;
    min-block-size: 0;
    border: 0;
    resize: none;
    outline: none;
    padding: 12px;
    font-family: var(--mono);
    font-size: 13px;
    line-height: 1.45;
    color: var(--text);
    background: #ffffff;
    min-block-size: 280px;
}

.status {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 12px;
    background: var(--panel);
    font-size: 13px;
    white-space: pre-wrap;
}

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

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

.status.warning {
    border-color: #d29922;
    background: #fff8c5;
    color: #7d4e00;
}

.tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    background: #f6f8fa;
    gap: 2px;
    padding: 6px 6px 0;
}

.tab {
    border: 1px solid transparent;
    border-radius: 8px 8px 0 0;
    padding: 7px 10px;
    background: transparent;
    color: var(--muted);
    font-size: 12px;
    font-weight: 600;
}

.tab[aria-selected="true"] {
    background: #ffffff;
    color: var(--text);
    border-color: var(--border);
    border-bottom-color: #ffffff;
    margin-bottom: -1px;
}

.preview {
    flex: 1;
    min-block-size: 280px;
    overflow: auto;
    padding: 0;
}

.preview-pane {
    display: none;
    block-size: 100%;
}

.preview-pane.active {
    display: block;
}

iframe {
    inline-size: 100%;
    block-size: 100%;
    border: 0;
    background: #ffffff;
}

pre {
    margin: 0;
    padding: 12px;
    font-family: var(--mono);
    font-size: 12px;
    line-height: 1.45;
    white-space: pre;
    min-block-size: 100%;
    overflow: auto;
}

.footer-note {
    color: var(--muted);
    font-size: 12px;
    text-align: center;
    padding: 4px 2px 0;
}

@media (max-inline-size: 980px) {
    .workspace {
        grid-template-columns: 1fr;
    }
}

@media (prefers-color-scheme: dark) {
    .panel-head {
        background: var(--panel);
    }

    .line-numbers {
        background: #0d1117;
    }

    .editor {
        background: #0d1117;
        color: var(--text);
    }

    .tabs {
        background: #21262d;
    }

    .tab[aria-selected="true"] {
        background: var(--panel);
        color: var(--text);
        border-bottom-color: var(--panel);
    }

    iframe {
        background: var(--panel);
    }

    pre {
        background: var(--panel);
        color: var(--text);
    }
}