:root{--purple:#702b80;--purple-soft:#f8f4fa;--purple-line:#eee1f4;--ink:#282c30;--muted:#646c75;--label:#777d82;--line:#ddd;--field-line:#ced2d5;--bg:#f2f2f2;--white:#fff;--drawer:#2e3847;--blue:#087dff;--green:#28a745;--red:#dc3545;--ok-bg:#e8f4ee;--ok-ink:#2b714d;--warn-bg:#fff0ce;--warn-ink:#84600c;--lesson-bg:#eaf4ff;--lesson-ink:#286797}*{box-sizing:border-box}html,body{margin:0}body{color:var(--ink);background:var(--bg);font:14px/1.5 Arial,Helvetica,sans-serif}button{font:inherit}a{color:var(--blue)}.mode-band{color:#fff;background:#352140;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:8px 22px;font-size:13px;display:flex}.mode-band b{color:#f4c43a}.mode-band button{color:#fff;cursor:pointer;background:0 0;border:1px solid #aa8bbb;border-radius:3px;padding:4px 10px}.app-header{background:var(--white);z-index:10;align-items:center;gap:28px;min-height:84px;padding:12px 22px;display:flex;position:sticky;top:0;box-shadow:0 3px 5px 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