:root{--navy:#101735;--ink:#18203f;--violet:#6d4cff;--violet2:#8f6bff;--cyan:#08c8ff;--mint:#22d39e;--amber:#ffb633;--rose:#ff5f9d;--paper:#ffffff;--soft:#f6f8ff;--line:#dde5ff} .aitu8{font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif;color:var(--ink);min-height:760px;background:radial-gradient(circle at 20% 0%,#eef4ff,transparent 34%),linear-gradient(135deg,#fbfdff,#f3f1ff 45%,#edfaff);display:grid;grid-template-columns:220px 1fr 300px;gap:18px;padding:14px;border-radius:26px;position:relative;overflow:hidden}.aitu8 *{box-sizing:border-box}.aitu8-side,.aitu8-chat,.search-hero,.lesson-panel,.subject-cloud{background:rgba(255,255,255,.74);border:1px solid rgba(180,196,255,.62);box-shadow:0 18px 50px rgba(32,42,90,.1);backdrop-filter:blur(16px);border-radius:24px}.aitu8-side{padding:18px}.aitu8-logo{display:flex;gap:10px;align-items:center;font-size:23px;color:#3a4bf5;line-height:1}.aitu8-logo em{font-style:normal;letter-spacing:4px;font-size:14px;color:#735dff}.logo-bot{width:52px;height:52px;display:grid;place-items:center;border-radius:18px;background:linear-gradient(135deg,#18214a,#6f58ff);box-shadow:0 10px 25px #6d4cff55}.aitu8-side nav{margin-top:24px;display:flex;flex-direction:column;gap:8px}.aitu8-side nav a{padding:12px 14px;border-radius:15px;color:#222b52;text-decoration:none}.aitu8-side nav a.active,.aitu8-side nav a:hover{background:linear-gradient(135deg,#fff,#eeeaff);color:#5a35ff;font-weight:800}.goal{margin-top:24px;background:linear-gradient(135deg,#6d4cff,#21c5ff);color:#fff;border-radius:20px;padding:16px}.goal span{display:block;margin:5px 0 10px}.goal div{height:8px;background:#ffffff55;border-radius:20px;overflow:hidden}.goal i{display:block;height:100%;background:#56ffd2;border-radius:20px}.aitu8-main{display:flex;flex-direction:column;gap:16px}.search-hero{padding:28px;position:relative;overflow:hidden}.search-hero 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10px;cursor:pointer}.lesson-panel{padding:18px;min-height:380px}.empty-state{text-align:center;padding:55px}.lesson-title{display:flex;justify-content:space-between;align-items:center}.dictionary-card,.theory-card,.interactive-zone,.quiz{background:#fff;border:1px solid #e1e7ff;border-radius:20px;padding:16px;margin:12px 0;box-shadow:0 12px 30px #1017350b}.dictionary-card{background:linear-gradient(135deg,#fff,#f0fbff)}.interactive-zone{display:grid;grid-template-columns:2fr 1fr;gap:16px}.visual-board{height:280px;border-radius:22px;background:linear-gradient(180deg,#eaf7ff,#fff7e7);position:relative;overflow:hidden;border:1px solid #d8e5ff}.fake-video{position:absolute;inset:38px;display:grid;place-items:center;text-align:center;border:2px dashed #9eb4ff;border-radius:22px;color:#667099;font-weight:900;background:rgba(255,255,255,.55)}.fake-video span{display:block;font-size:13px;color:#8790a8}.tap-point{position:absolute;z-index:2;width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#ffb633,#ff5f9d);color:#fff;font-weight:900;box-shadow:0 0 0 12px #ffb63324;cursor:pointer;animation:pulse 1.4s infinite}.p1{left:35px;top:45px}.p2{right:70px;top:75px}.p3{left:45%;bottom:42px}.quiz .answer{border:1px solid #dce3ff;background:#fff;border-radius:15px;padding:12px 16px;margin-right:8px;cursor:pointer}.quiz .good{background:linear-gradient(135deg,#20c997,#22d39e);color:#fff}.score{display:inline-block;margin-left:8px;color:#ce7c00}.aitu8-chat{padding:16px}.aitu8-chat h3{margin-top:0}.chat-feed{height:390px;overflow:auto;background:#f8faff;border-radius:18px;padding:12px;border:1px solid #e4e9ff}.chat-feed p{padding:10px 12px;border-radius:14px;max-width:90%;background:#fff;box-shadow:0 8px 20px #1017350d}.chat-feed 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#dfe5ff;border-radius:999px;padding:7px 10px;font-style:normal;font-weight:900;font-size:12px;color:#4b46a8;box-shadow:0 8px 20px #10173518;animation:bubblePop 2s infinite}.bot3d{left:12px;top:600px;animation:walkBot 18s linear infinite}.cat3d{left:55%;top:650px;animation:catPath 15s ease-in-out infinite}.bunny3d{right:330px;top:130px;animation:bunnyHop 11s ease-in-out infinite}.owl3d{left:250px;top:110px;animation:owlFly 20s linear infinite}.fox3d{right:90px;bottom:25px;animation:foxGuide 14s ease-in-out infinite}.safety-block{padding:30px;text-align:center;background:#fff0f4;border:1px solid #ffc4d6;border-radius:18px;font-weight:900;color:#9a2451}@keyframes floaty{50%{transform:translateY(-12px) rotate(8deg)}}@keyframes pulse{50%{transform:scale(1.1);box-shadow:0 0 0 20px #ffb63308}}@keyframes body3d{from{transform:rotateX(10deg) rotateY(-9deg) translateY(0)}to{transform:rotateX(5deg) rotateY(11deg) translateY(-8px)}}@keyframes bubblePop{0%,70%,100%{transform:scale(.95);opacity:.8}20%{transform:scale(1.05);opacity:1}}@keyframes walkBot{0%{transform:translate3d(0,0,0) rotateY(0)}25%{transform:translate3d(46vw,-95px,80px) rotateY(25deg)}50%{transform:translate3d(78vw,-450px,10px) rotateY(-35deg)}75%{transform:translate3d(35vw,-250px,120px) rotateY(35deg)}100%{transform:translate3d(0,0,0) rotateY(0)}}@keyframes catPath{0%,100%{transform:translate3d(0,0,0) rotateY(0) rotateZ(0)}30%{transform:translate3d(-330px,-370px,90px) rotateY(180deg) rotateZ(-4deg)}60%{transform:translate3d(230px,-260px,60px) rotateY(0) rotateZ(5deg)}80%{transform:translate3d(60px,-80px,120px) rotateY(-25deg)}}@keyframes bunnyHop{0%,100%{transform:translate3d(0,0,0) rotateY(0)}20%{transform:translate3d(-120px,90px,70px) rotateY(20deg) translateY(-40px)}40%{transform:translate3d(-220px,230px,100px) rotateY(-30deg)}70%{transform:translate3d(90px,360px,40px) rotateY(180deg) translateY(-55px)}}@keyframes owlFly{0%{transform:translate3d(0,0,20px) rotateY(0) rotateZ(0)}25%{transform:translate3d(340px,25px,100px) rotateY(30deg) rotateZ(6deg)}50%{transform:translate3d(700px,420px,80px) rotateY(160deg) rotateZ(-7deg)}75%{transform:translate3d(250px,520px,110px) rotateY(220deg)}100%{transform:translate3d(0,0,20px) rotateY(360deg)}}@keyframes foxGuide{0%,100%{transform:translate3d(0,0,0) rotateY(0)}35%{transform:translate3d(-260px,-70px,80px) rotateY(-20deg)}55%{transform:translate3d(-490px,-430px,90px) rotateY(-160deg)}80%{transform:translate3d(-160px,-520px,120px) rotateY(30deg)}}@media(max-width:1100px){.aitu8{grid-template-columns:1fr}.aitu8-side,.aitu8-chat{display:none}.tutor-row{grid-template-columns:repeat(2,1fr)}.subject-cloud>div{grid-template-columns:1fr}.interactive-zone{grid-template-columns:1fr}.search-hero h1{font-size:30px}.mascot{display:none}}