*{margin:0;padding:0;box-sizing:border-box}body{margin:0;font-family:Segoe UI,Noto Sans KR,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}#root{min-height:100vh}.header{background:linear-gradient(135deg,#3c3530,#4a4035);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);padding:1rem 1.5rem;box-shadow:0 4px 20px #2c241626;border-bottom:2px solid var(--teacher-color);position:relative;z-index:100}.header:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,transparent 0%,rgba(255,255,255,.03) 100%);pointer-events:none}.header-content{max-width:900px;margin:0 auto;display:flex;align-items:center;gap:1rem;position:relative;z-index:1}.back-button{background:#ffffff1a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px 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