考试备考系统

Use this skill when building, scaffolding, or refactoring ANY pure-frontend H5 quiz / exam-prep system (考研, 公考, 医师资格, 法律职业, language certs, corporate training, etc.) from scratch or adapting an existing one. It provides a reusable architecture template with single-file loading (questions.json, fetch with retry, no shard/IndexedDB dependency), standard module breakdown (daily / chapter / mock / real-exam / mistakes / favorites / knowledge cards), a GLOBAL SUBJECT SELECTOR in the sidebar (below brand, above nav; lockable per-module; single-subject auto-hide), mistake "conquer" semantics (mark-conquered not delete; idempotent by questionId), rail + 3D flip knowledge cards with pure-click interaction (no keyboard/ARIA), LocalStorage progress model with silent resume, responsive left-folding nav with chapter-filter drawers (left-slide), exam-mode answer-hiding (submit auto-advance, no reveal until 交卷), exam question-number palette on the left, exam-result with stats + single-question review browse (per-question: question+options+user-answer+correct-answer, back-to-result button on last), two-level collapsible sidebar nav with subject selector in sidebar, practice-mode last-question stop (no next/jump), knowledge single-card with localStorage progress tracking, mistake/favorite single-question paged review (no chapter filter), exam exit guard (SHA-256 hashed) with auto nickname mapping, jsdom smoke-test workflow, a HARDENED pitfall set (built-in SHA-256 template with >>> mod-32 fix, fetch `no-store` with 3-tier retry, global error listeners, stopTimer null-guard, and 10 others), and CloudStudio / COS deploy flows. Trigger when the user asks or wants a generic, exam-agnostic version of a subject-specific prep tool.

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