:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;min-width:320px;min-height:100vh;background-color:#f5f5f5}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media(prefers-color-scheme:light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}.exercise-page-wrapper{width:100%;display:flex;justify-content:center;box-sizing:border-box}.exercise-container{display:flex;justify-content:center;align-items:flex-start;width:100%;padding-top:60px;box-sizing:border-box}.exercise-card{width:900px;background:#fff;padding:40px;border-radius:20px;box-shadow:0 4px 20px #0000001a}.exercise-title{text-align:center;font-size:32px;color:#00c853;margin-bottom:25px}.exercise-subtitle{text-align:center;font-size:18px;margin-bottom:15px}.exercise-buttons{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-bottom:30px}.exercise-btn{padding:10px 18px;background:#eee;border-radius:20px;border:1px solid #ddd;cursor:pointer;transition:.2s}.exercise-btn:hover{background:#dcdcdc}.exercise-btn.active{background:#00c853;color:#fff;border-color:#00a844}.exercise-placeholder{text-align:center;padding:20px;background:#f7f7f7;border-radius:15px;border:1px solid #ddd;color:#777;font-size:15px}.exercise-content{display:flex;justify-content:center;align-items:flex-start;gap:20px;margin-top:20px}.exercise-image{width:260px;height:260px;object-fit:contain;border-radius:15px}.exercise-info{width:55%}.exercise-info h3{font-size:22px;margin-bottom:10px;color:#00c853}.exercise-text{white-space:pre-wrap;font-size:16px;line-height:1.5}.chat-container{max-width:700px;margin:40px auto;padding:20px}.chat-title{text-align:center;font-size:32px;margin-bottom:20px;color:#00c853;font-weight:700}.chat-box{width:100%;height:450px;background:#f8f8f8;border-radius:15px;padding:20px;overflow-y:auto;border:1px solid #ddd;box-shadow:0 3px 10px #0000000d}.chat-message{display:flex;margin-bottom:12px}.chat-message.bot{justify-content:flex-start}.chat-message.bot .bubble{background:#fff;color:#333;border:1px solid #ddd}.chat-message.user{justify-content:flex-end}.chat-message.user .bubble{background:#00c853;color:#fff}.bubble{max-width:75%;padding:12px 15px;border-radius:15px;line-height:1.4;font-size:15px;box-shadow:0 2px 5px #00000014}.input-area{display:flex;margin-top:15px;gap:10px}.chat-input{flex:1;padding:14px 15px;border-radius:10px;border:1px solid #ccc;outline:none;font-size:15px}.send-btn{padding:14px 22px;background:#00c853;border:none;color:#fff;border-radius:10px;cursor:pointer;font-size:16px;font-weight:700}.send-btn:hover{background:#00a347}.quick-buttons{margin-top:20px;display:flex;flex-wrap:wrap;gap:10px;justify-content:center}.quick-btn{background:#e8ffe9;border:1px solid #00C853;color:#00c853;padding:10px 16px;border-radius:20px;font-size:14px;cursor:pointer}.quick-btn:hover{background:#00c853;color:#fff}