:root{--color-bg: #fafbfc;--color-surface: #fff;--color-border: #e1e4e8;--color-text: #24292e;--color-text-muted: #586069;--color-link: #0366d6;--color-link-hover: #074fb0;--color-link-active: #5a32a3;--color-accent: #0969da;--color-accent-bg: #eef5ff;--color-accent-bg-hover: #e2efff;--color-accent-bg-active: #d5e8ff;--color-success: #1a7f37;--color-error: #cf222e;--color-tag-topic: #0550ae;--color-tag-topic-bg: #ddf4ff;--color-tag-technique: #8250df;--color-tag-technique-bg: #fbefff;--font-sans: "Helvetica Neue", Helvetica, Arial, sans-serif;--font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;--radius: 6px;--radius-sm: 4px;--control-height: 30px;--control-font-size: .875rem;--control-line-height: 1.35;--shadow-popover: 0 1px 0 rgba(255, 255, 255, .6) inset, 0 2px 4px rgba(0, 0, 0, .05), 0 4px 10px rgba(0, 0, 0, .08);--shadow-card: 0 2px 4px rgba(0, 0, 0, .2);--max-width: 960px;--max-width-wide: 1200px;--color-solved: #40c463;--color-solved-row: 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