:root{font-family:Arial,system-ui,sans-serif;color:#243c31;background:#f5f2e7;font-size:16px;line-height:1.65}*{box-sizing:border-box}body{margin:0}a{color:#205b42}button,input,select,textarea{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer;min-height:46px;border:1px solid #b5c8b2;background:#f3f6ed;border-radius:6px;color:#204c36;padding:10px 16px}button:disabled{opacity:.55;cursor:default}input,textarea,select{display:block;width:100%;min-width:0;max-width:100%;min-height:46px;padding:10px 12px;font-size:16px;border:1px solid #bccbbb;border-radius:6px;background:#fffef9;color:#243c31}input[type=checkbox]{width:20px;height:20px;min-height:20px;flex:0 0 20px;accent-color:#245b40;margin-top:4px}label{display:block;margin:12px 0;font-size:14px}label input,label textarea,label select{margin-top:6px}.teacher-check{display:flex;align-items:flex-start;gap:10px}.teacher-check input{margin-top:4px}[hidden]{display:none!important}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #3a7a57;outline-offset:3px}.teacher-header{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:16px max(20px,calc((100vw - 1080px)/2));background:#fff9e8;border-bottom:1px solid #d6d4bd}.teacher-brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:#174e37}.teacher-brand img{border:1px solid #b79c5e;border-radius:50%;padding:3px;background:#fffef8}.teacher-brand strong{display:block;font-size:16px;letter-spacing:1px}.teacher-brand small{font-size:12px}.teacher-main{width:calc(100% - 32px);max-width:1080px;margin:24px auto}.teacher-hero{padding:28px 0}.teacher-eyebrow{font-size:11px;letter-spacing:1.4px;color:#62764f}h1{font-size:32px;line-height:1.3;color:#174e37;margin:12px 0}h2{font-size:22px;color:#174e37}h3{font-size:18px}.teacher-card{background:#fffef9;border:1px solid #d5ddcc;border-radius:10px;padding:24px;margin:20px 0}.teacher-session{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.teacher-session>p{flex:1 1 100%;margin-bottom:0}.teacher-button,.teacher-primary{display:inline-block;background:#245b40;color:white;border-radius:6px;padding:10px 16px;text-decoration:none;min-height:46px}.teacher-catalog{display:flex;gap:8px;flex-wrap:wrap}.teacher-catalog span{border:1px solid #d3deca;border-radius:5px;padding:6px 10px;background:#f5f7ed;font-size:13px}.teacher-note,.teacher-footer{font-size:13px;color:#586b54}.teacher-answer-text{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.85}.teacher-lesson{border-top:1px solid #dbe2d2;padding:18px 0}.teacher-lesson summary{cursor:pointer;color:#245b40;font-weight:bold;min-height:44px;padding:9px 0}.teacher-lesson p{overflow-wrap:anywhere}.teacher-lesson small{display:block;color:#5a6b54}.teacher-lesson blockquote{margin:16px 0;border-left:3px solid #b79c5e;padding:10px 16px;background:#f8f6e9}.teacher-footer{padding:20px 0}#teacherRevoke{border-top:1px solid #dce3d5;margin-top:24px;padding-top:12px}#teacherAnswer{margin-top:20px;padding-top:16px;border-top:1px solid #d3deca}@media(max-width:600px){.teacher-header{align-items:flex-start;flex-direction:column;padding:16px}.teacher-main{width:calc(100% - 24px)}.teacher-card{padding:16px}.teacher-hero{padding:12px 0}h1{font-size:27px}h2{font-size:20px}.teacher-session>*{width:100%}.teacher-header>a:last-child{font-size:13px}}

/* Gọn phần điều hướng, ưu tiên lời luận trên điện thoại. */
#teacherAccount{margin:0 0 1rem;padding:.6rem 1rem;border:1px solid #d3dec9;border-radius:10px} .reading-title{font-size:clamp(1.35rem,4vw,1.8rem);margin:0 0 1rem} #teacherAnswerText{line-height:1.8;overflow-wrap:anywhere} #teacherAnswer{scroll-margin-top:1rem} .teacher-main details>summary{cursor:pointer} @media(max-width:480px){.teacher-session{display:flex;flex-wrap:wrap;gap:.5rem}.teacher-session>*{max-width:100%;box-sizing:border-box}.teacher-header{gap:.7rem}.teacher-brand small{font-size:.75rem}}