:root{--blue:#0d49b7;--red:#d82727;--ink:#1d2430;--muted:#667085;--line:#e5e7eb;--soft:#f7f9fc;--card:#fff;--shadow:0 14px 38px rgba(15,23,42,.09)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:#fff}button{font:inherit}img{max-width:100%;display:block}.topbar{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:18px;padding:10px 18px}.brand{border:0;background:transparent;display:flex;align-items:center;gap:12px;text-align:left;cursor:pointer}.brand img{width:104px}.brand strong{display:block;color:var(--blue);text-transform:uppercase;font-size:18px}.brand em{display:block;color:var(--muted);font-style:normal;font-size:13px}nav{display:flex;gap:8px;flex-wrap:wrap}nav button,.tabs button,.voicePanel button,.linkButton,.lessonTabs button{border:1px solid 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