:root{--primary:#0b63ce;--primary-dark:#084b9c;--accent:#ff8a00;--accent-soft:#fff3e4;--ai:#6d5dfc;--teacher:#0aa36f;--text:#1d2433;--muted:#637083;--line:#e6eaf0;--bg:#f5f8fc;--card:#fff;--warning:#f4a100;--success:#00a66a;--shadow:0 16px 40px rgba(20,44,76,.12);--radius:18px}*{-webkit-box-sizing:border-box;box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Hiragino Sans,Hiragino Kaku Gothic ProN,Yu Gothic,Meiryo,sans-serif;color:var(--text);background:var(--bg);line-height:1.75}a{color:inherit;text-decoration:none}.btn{display:-ms-inline-flexbox;display:inline-flex;-ms-flex-align:center;align-items:center;-ms-flex-pack:center;justify-content:center;gap:8px;min-height:44px;padding:0 18px;border-radius:999px;font-weight:700;border:1px solid transparent;cursor:pointer;-webkit-transition:background .15s ease,-webkit-transform .15s ease,-webkit-box-shadow .15s ease;transition:background .15s ease,-webkit-transform .15s ease,-webkit-box-shadow .15s 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