:root{--ink: #182b5c;--ink-soft: #3a4d85;--paper: #f7f4ec;--card: #ffffff;--poppy: #d43a2f;--leaf: #3e7c59;--tint: #e6ebf7;--line: #d8d2c4;--radius: 14px;--font-display: "Fraunces", Georgia, serif;--font-body: "Public Sans", system-ui, sans-serif}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--paper);color:var(--ink);font-family:var(--font-body);font-size:16px;line-height:1.5}h1,h2,h3{font-family:var(--font-display);font-weight:700;margin:0 0 .4rem}h1{font-size:1.9rem}h2{font-size:1.35rem}a{color:var(--ink)}button{font-family:var(--font-body);cursor:pointer}:focus-visible{outline:3px solid var(--poppy);outline-offset:2px;border-radius:4px}@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important}}.shell{max-width:680px;margin:0 auto;padding:0 16px 90px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 0 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0}.muted{color:var(--ink-soft);font-size:.9rem}.progressbar{height:8px;background:var(--tint);border-radius:999px;overflow:hidden;margin:12px 0 20px}.progressbar>div{height:100%;background:var(--poppy);border-radius:999px;transition:width .3s}.exercise-prompt{font-family:var(--font-display);font-size:1.45rem;font-weight:700;margin:8px 0 18px}.choices{display:flex;flex-direction:column;gap:10px}.choice-btn{background:var(--card);border:2px solid var(--line);border-radius:10px;padding:13px;font-size:1rem;text-align:left;font-weight:500;color:var(--ink)}.choice-btn.selected{border-color:var(--ink);background:var(--tint)}.choice-btn.right{border-color:var(--leaf);background:#e6f2ea}.choice-btn.wrong{border-color:var(--poppy);background:#fbe9e7}.feedback{border-radius:10px;padding:12px 14px;margin-top:14px;font-weight:500}.feedback.ok{background:#e6f2ea;color:var(--leaf)}.feedback.bad{background:#fbe9e7;color:var(--poppy)}.flashcard{background:var(--card);border:2px solid var(--ink);border-radius:var(--radius);min-height:180px;display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-size:1.7rem;font-weight:700;text-align:center;padding:20px;margin-bottom:16px;cursor:pointer;-webkit-user-select:none;user-select:none}.audio-btn{background:var(--tint);border:2px solid var(--ink);color:var(--ink);border-radius:999px;width:74px;height:74px;font-size:1.8rem;display:block;margin:10px auto 20px}.convo-thread{display:flex;flex-direction:column;gap:10px;margin-bottom:14px}.bubble{max-width:85%;padding:12px 14px;border-radius:16px}.bubble.partner{background:var(--card);border:1px solid var(--line);align-self:flex-start;border-bottom-left-radius:4px}.bubble.me{background:var(--ink);color:var(--paper);align-self:flex-end;border-bottom-right-radius:4px}.bubble .fr{font-weight:600}.bubble .en{font-size:.85rem;opacity:.75;margin-top:3px}.bubble 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p{color:var(--ink-soft)}table.admin{width:100%;border-collapse:collapse;font-size:.9rem}table.admin th,table.admin td{text-align:left;padding:8px 6px;border-bottom:1px solid var(--line)}.spinner{text-align:center;padding:40px;color:var(--ink-soft)}