.master-tutor{display:grid;gap:17px}
.tutor-page-head{display:flex;align-items:center;justify-content:space-between}
.tutor-page-head span{color:#aa94ff;font-family:"DM Mono",monospace;font-size:12px;font-weight:700;letter-spacing:.1em}
.tutor-page-head h1{margin:5px 0;color:#fff;font-size:30px}
.tutor-page-head p{margin:0;color:#9cadce}
.tutor-page-actions{display:flex;align-items:center;gap:18px}
.tutor-page-nav{display:flex;gap:25px}
.tutor-page-nav button{border:0;border-bottom:2px solid transparent;padding:8px 3px;background:transparent;color:#aebcdf;font:600 13px inherit}
.tutor-page-nav button.active{border-color:#936ffe;color:#e2d9ff}
.tutor-finish{white-space:nowrap}
.tutor-layout{display:grid;grid-template-columns:360px minmax(590px,1.3fr) 400px;gap:17px}
.tutor-profile,.tutor-conversation,.tutor-control>section{border:1px solid #2b4275;border-radius:16px;background:#0e1a38}
.tutor-profile{padding:18px}
.tutor-profile>header{display:flex;align-items:center;gap:10px}
.tutor-profile>header>i{display:grid;place-items:center;width:40px;height:40px;border-radius:11px;background:#36227d;color:#b5a0ff}
.tutor-profile h2{margin:0;color:#fff;font-size:20px}
.tutor-profile header p{margin:4px 0;color:#a2b2d5;font-size:11px}
.tutor-profile header>b{margin-left:auto;border:1px solid #46b68e;border-radius:16px;padding:7px 10px;background:#143f3c;color:#71e4bb;font-size:11px}
.tutor-portrait{position:relative;box-sizing:border-box;height:375px;margin-top:14px;overflow:hidden;border-radius:12px;padding-bottom:68px;background:radial-gradient(circle at 50% 25%,rgba(109,76,240,.36),transparent 35%),#101b3d}
.tutor-portrait img{display:block;width:100%;height:100%;object-fit:cover;object-position:center}
.tutor-avatar-stage{position:absolute;top:0;right:0;bottom:68px;left:0;overflow:hidden}.tutor-avatar-stage canvas{display:block;width:100%;height:100%;touch-action:none}.tutor-avatar-stage .tutor-avatar-fallback{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;transition:opacity .25s}.tutor-avatar-stage .tutor-avatar-fallback.is-hidden{opacity:0;pointer-events:none}.tutor-avatar-stage output{position:absolute;top:10px;left:50%;max-width:calc(100% - 24px);transform:translateX(-50%);border:1px solid rgba(139,110,255,.75);border-radius:99px;padding:5px 9px;background:rgba(13,24,57,.82);color:#cabdff;font-size:10px;white-space:nowrap}.tutor-avatar-stage[data-avatar-state="ready"] output{color:#76e4bc;border-color:rgba(94,218,171,.6)}.tutor-portrait>span{z-index:2;bottom:13px}.avatar-controls{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:7px;align-items:end;margin:12px 0}.avatar-controls label{display:grid;gap:4px;color:#99add3;font-size:10px}.avatar-controls select,.avatar-controls button{min-width:0;border:1px solid #3d5794;border-radius:8px;padding:8px;background:#172750;color:#dbe6ff;font:600 10px inherit}.avatar-controls button{cursor:pointer}.avatar-controls button:hover{border-color:#9371ff;background:#30236c}
.tutor-portrait span{position:absolute;bottom:18px;left:50%;transform:translateX(-50%);border:1px solid #8365fa;border-radius:22px;padding:11px 15px;background:rgba(48,32,116,.9);color:#e5dcff;font-size:12px;white-space:nowrap}
.tutor-3d-avatar{position:absolute;z-index:3;inset:0 0 68px;overflow:hidden;background:#0a142d}.tutor-3d-avatar iframe{display:block;width:100%;height:100%;border:0;background:#0a142d}.tutor-3d-avatar small{position:absolute;top:9px;right:9px;border:1px solid rgba(133,111,242,.7);border-radius:99px;padding:5px 8px;background:rgba(8,18,43,.78);color:#d5ccff;font-size:9px}.tutor-3d-avatar small i{margin-right:4px;color:#a78dff}
.tutor-profile-features{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:14px 0}
.tutor-profile-features button{display:grid;place-items:center;gap:4px;border:1px solid #2e467a;border-radius:9px;padding:10px 4px;background:#152349;color:#afc2e8;font-size:18px}
.tutor-profile-features button.active{border-color:#9a78ff;background:#332176;color:#fff;box-shadow:0 0 17px rgba(130,91,255,.38)}
.tutor-profile-features small{color:#b5c6e9;font-size:9px}
.tutor-profile footer{display:grid;grid-template-columns:1fr 1fr;justify-items:center;gap:4px;border-top:1px solid #263c68;padding-top:14px}
.voice-button,.keyboard-button{display:grid;place-items:center;width:75px;height:75px;border:2px solid #8869ff;border-radius:50%;background:#4d31bd;color:#fff;font-size:28px;box-shadow:0 0 22px rgba(118,81,255,.8)}
.keyboard-button{background:#16264e;color:#b8caff}
.tutor-profile footer b{color:#dce6ff;font-size:12px}
.tutor-profile footer small{color:#91a3ca;font-size:10px}
.tutor-conversation{display:grid;grid-template-rows:75px minmax(0,1fr) 170px;min-height:780px;overflow:hidden}
.tutor-conversation{height:min(780px,calc(100vh - 150px));min-height:620px}
.tutor-conversation>header{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #263d6b;padding:16px 20px}
.tutor-conversation>header>div{display:flex;align-items:center;gap:10px}
.tutor-conversation>header>div>i{display:grid;place-items:center;width:37px;height:37px;border-radius:10px;background:#342177;color:#b9a4ff}
.tutor-conversation h2{margin:0;color:#fff;font-size:18px}
.tutor-conversation header p{margin:5px 0;color:#9badcf;font-size:11px}
.tutor-conversation>header>button{border:0;background:transparent;color:#9caed0;font:600 11px inherit}
.tutor-session-actions{flex:0 1 auto;justify-content:flex-end;min-width:0}.tutor-session-actions select{max-width:230px;min-width:110px;border:1px solid #354d82;border-radius:8px;padding:8px;background:#142348;color:#c6d5f4;font:11px inherit}.tutor-session-actions>[data-new-tutor-chat]{flex:none;white-space:nowrap;border:1px solid #7456d5;border-radius:8px;padding:8px 10px;background:#30226b;color:#fff;font:600 11px inherit;cursor:pointer}.tutor-session-actions>[data-new-tutor-chat]:hover{border-color:#ad94ff;background:#493391}.tutor-session-actions>[data-new-tutor-chat]:disabled{opacity:.6;cursor:wait}
.conversation-scroll{min-height:0;overflow:auto;padding:18px 20px;overscroll-behavior:contain;scroll-behavior:smooth}
.message{position:relative;max-width:90%;margin:0 0 18px;color:#dbe6ff;font-size:14px;line-height:1.75}
.message.user{margin-left:auto;border-radius:18px 18px 3px 18px;padding:14px 18px;background:#7047e8;color:#fff}
.message.user>i{position:absolute;right:-32px;top:5px;color:#b5a8ff;font-size:25px}
.message.user small{display:block;margin-top:6px;color:#e5dfff;font-size:10px;text-align:right}
.message.assistant{display:grid;grid-template-columns:45px 1fr;gap:10px}
.message.assistant>img{width:40px;height:40px;border-radius:50%;object-fit:cover}
.message.assistant>div{border-radius:12px;padding:13px;background:#1b2a51}
.message.assistant b{color:#fff;font-size:12px}
.message.assistant p{margin:6px 0;color:#d7e2ff}
.message.assistant .streaming-text{white-space:normal}
.streaming-caret{display:inline-block;width:2px;height:1.05em;margin-left:2px;vertical-align:-.16em;background:#9c7dff;animation:tutor-caret .8s step-end infinite}
@keyframes tutor-caret{50%{opacity:0}}
.message.assistant small{color:#81dcb7;font-size:10px}
.tutor-citation{position:relative;overflow:hidden;margin-top:12px;border:1px solid #d9d4d0;border-radius:8px;padding:15px;background:#f6f4ee;color:#253252}
.tutor-citation>b{font-family:"Noto Serif SC",serif;color:#314780;font-size:18px}
.tutor-citation p{max-width:58%;color:#465777!important;font-family:"Noto Serif SC",serif;font-size:12px;line-height:1.8}
.citation-curve{position:absolute;right:18px;top:28px;width:142px;height:94px;border-left:2px solid #394b77;border-bottom:2px solid #394b77;background:linear-gradient(160deg,transparent 47%,#f27cbf 48% 50%,transparent 51%),linear-gradient(45deg,transparent 50%,#659fff 51% 53%,transparent 54%)}
.tutor-citation footer{border-top:1px solid #ced2db;padding-top:8px;color:#5d6d9c;font-size:10px}
.tutor-message-box{display:grid;grid-template-rows:minmax(66px,1fr) auto;margin:0 18px 16px;border:1px solid #7b5be5;border-radius:12px;overflow:hidden;background:#111d40}
.tutor-message-box textarea{width:100%;min-height:66px;height:100%;box-sizing:border-box;border:0;outline:0;padding:11px;background:transparent;color:#eef4ff;font:13px inherit;resize:none}
.tutor-message-box textarea:disabled{color:#9aa9cb;cursor:not-allowed}.tutor-message-box footer>button:disabled{opacity:.42;cursor:not-allowed}.tutor-message-box footer .btn:disabled{border-color:#485779;background:#253251;color:#a7b3cd;box-shadow:none}
.tutor-message-box footer{display:flex;align-items:center;gap:8px;min-height:42px;border-top:1px solid #2a406d;padding:7px}
.tutor-message-box footer>button{border:0;background:transparent;color:#adbfdf;font:11px inherit}
.tutor-message-box footer .btn{margin-left:auto;border:1px solid #8464ff;border-radius:9px;padding:8px 12px;color:#fff}
.tutor-control{display:grid;align-content:start;gap:14px}
.tutor-control>section{padding:17px}
.tutor-control h2{margin:0;color:#fff;font-size:17px}
.tutor-control h2 i{color:#9c83ff;margin-right:8px}
.tutor-control>section>p{margin:7px 0 13px;color:#9babcd;font-size:11px}
.role-options,.answer-options{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
.role-options button,.answer-options button{display:grid;place-items:center;gap:7px;border:1px solid #324a7c;border-radius:10px;padding:14px 7px;background:#142247;color:#c4d4f4;font-size:24px}
.role-options button.active,.answer-options button.active{border-color:#9370ff;background:#2a1d6f;box-shadow:0 0 13px rgba(128,90,255,.34)}
.role-options b,.answer-options b{color:#e8efff;font-size:12px}
.role-options small,.answer-options small{color:#96a8d0;font-size:10px;line-height:1.45}
.answer-options{grid-template-columns:1fr}
.answer-options button{place-items:start;text-align:left}
.tutor-source-link[href]{text-decoration:none}
.tutor-reminder header{display:flex;justify-content:space-between}
.tutor-reminder header span{color:#91a4cd;font-size:10px}
.reminder-ring{display:grid;place-items:center;float:left;width:100px;height:100px;margin:13px 14px 0 0;border:11px solid #33256a;border-top-color:#906bff;border-radius:50%}
.reminder-ring b{color:#fff;font-size:25px}
.reminder-ring small{display:block;color:#bfc7e7;font-size:10px}
.tutor-reminder>p{margin:22px 0;color:#c7d4f0;font-size:12px;line-height:1.7}
.tutor-control>footer{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.tutor-control>footer button{display:grid;gap:5px;border:1px solid #31487b;border-radius:10px;padding:14px;background:#142249;color:#dbe7ff;text-align:center}
.tutor-control>footer button.btn{border-color:#8966ff}
.tutor-control>footer b{font-size:14px}
.tutor-control>footer small{color:#9eb0d3;font-size:10px}
@media(max-width:1220px){.tutor-layout{grid-template-columns:300px 1fr}
.tutor-control{grid-column:span 2;grid-template-columns:1fr 1fr}
.tutor-control>footer{grid-column:span 2}
}
@media(max-width:800px){.tutor-page-head{display:block}
.tutor-page-actions{overflow:auto;margin-top:12px}
.tutor-layout,.tutor-control{grid-template-columns:1fr}
.tutor-control{grid-column:auto}
.tutor-control>footer{grid-column:auto}
.tutor-portrait{height:290px}
.tutor-conversation{min-height:650px}
.role-options{grid-template-columns:1fr 1fr 1fr}
}
.tutor-profile.is-speaking .tutor-portrait img{animation:tutorTalk .58s ease-in-out infinite alternate}.tutor-profile.is-speaking .tutor-portrait{box-shadow:inset 0 0 38px rgba(125,85,255,.35),0 0 22px rgba(105,78,240,.28)}.tutor-profile.is-listening .tutor-portrait{box-shadow:inset 0 0 38px rgba(80,205,180,.28),0 0 22px rgba(70,198,174,.2)}@keyframes tutorTalk{from{transform:scale(1)}to{transform:scale(1.018) translateY(-1px)}}
.tutor-profile.is-speaking .tutor-avatar-stage canvas{animation:tutorTalk .58s ease-in-out infinite alternate}
.avatar-controls{grid-template-columns:minmax(0,1fr) auto}.avatar-controls .tutor-tts-status{grid-column:1/-1;min-height:14px;color:#91a7d2;font-size:10px;line-height:1.4}.avatar-controls .tutor-tts-status:empty{display:none}
.tutor-session-actions>[data-tutor-memory]{flex:none;white-space:nowrap;border:1px solid #53649a;border-radius:8px;padding:8px 10px;background:#18294c;color:#d7e3ff;font-size:11px;font-weight:600;font-family:inherit;cursor:pointer}.tutor-session-actions>[data-tutor-memory]:hover{border-color:#a38aff;background:#27205a}
.tutor-memory-dialog{overflow:auto;width:min(760px,calc(100vw - 28px));max-width:none;max-height:88vh;padding:0;border:1px solid #536da8;border-radius:18px;background:#0c1731;color:#dce7ff;box-shadow:0 28px 100px #000a}.tutor-memory-dialog::backdrop{background:#020817bb;backdrop-filter:blur(4px)}.tutor-memory-panel{display:grid;gap:15px;padding:22px}.tutor-memory-panel>header{display:flex;justify-content:space-between;align-items:start}.tutor-memory-panel>header span{color:#a68aff;font:700 10px ui-monospace,monospace;letter-spacing:.12em}.tutor-memory-panel h2{margin:4px 0 0;color:#fff;font-size:22px}.tutor-memory-panel>header button{border:0;background:transparent;color:#b9c9eb;font-size:25px;cursor:pointer}.tutor-memory-privacy{margin:0;border:1px solid #334978;border-radius:10px;padding:11px 13px;background:#121f3d;color:#acbfdf;font-size:12px;line-height:1.7}.tutor-memory-panel section{min-width:0}.tutor-memory-panel section h3{display:flex;justify-content:space-between;margin:0 0 9px;color:#e4ecff;font-size:14px}.tutor-memory-panel section h3 small{color:#91a6cf;font-size:11px;font-weight:400}.tutor-memory-list,.tutor-memory-sources{display:grid;gap:8px;max-height:190px;overflow:auto;padding:2px}.tutor-memory-card{border:1px solid #304573;border-radius:11px;padding:11px;background:#111f3d}.tutor-memory-edit{display:grid;grid-template-columns:130px minmax(0,1fr);gap:8px}.tutor-memory-panel select,.tutor-memory-panel textarea{width:100%;border:1px solid #354b79;border-radius:8px;padding:8px;background:#0c1832;color:#e4ecff;font:inherit;font-size:12px}.tutor-memory-panel textarea{min-height:56px;resize:vertical}.tutor-memory-card>small{display:block;margin-top:8px;color:#91a6cf;font-size:10px;line-height:1.5}.tutor-memory-card>footer,.tutor-memory-panel section>footer{display:flex;justify-content:flex-end;gap:8px;margin-top:9px}.tutor-memory-card>footer button,.tutor-memory-panel section>footer button{border:1px solid #566b9e;border-radius:8px;padding:7px 10px;background:#16274a;color:#d8e4ff;font-size:11px;cursor:pointer}.tutor-memory-card>footer button:hover,.tutor-memory-panel section>footer button:hover{border-color:#a28aff}.tutor-memory-panel section>footer button.btn{border-color:#8866ff;background:#6845e5;color:#fff}.tutor-memory-panel button:disabled{opacity:.55;cursor:wait}.tutor-memory-source{display:flex;align-items:start;gap:9px;border:1px solid #293e68;border-radius:9px;padding:9px;background:#101d39;color:#c3d3f1;font-size:12px;line-height:1.5;cursor:pointer}.tutor-memory-source input,.tutor-memory-candidate input{accent-color:#8866ff}.tutor-memory-candidate>label{display:flex;align-items:center;gap:7px;margin-bottom:8px;color:#b8c9eb;font-size:11px}.tutor-memory-empty,.tutor-memory-error{margin:0;padding:12px;color:#94a8cf;font-size:12px;line-height:1.6}.tutor-memory-error{color:#ffb7bf}
@media(max-width:620px){.tutor-memory-panel{padding:15px}.tutor-memory-edit{grid-template-columns:1fr}.tutor-session-actions>[data-tutor-memory]{font-size:10px;padding:7px}.tutor-memory-dialog{max-height:94vh}}
.tutor-inline-memory{display:grid;gap:7px;margin-top:12px;border:1px solid #57499b;border-radius:10px;padding:11px;background:#211c4a;color:#e4eaff}.tutor-inline-memory>b{font-size:12px}.tutor-inline-memory>label{display:grid;grid-template-columns:44px minmax(0,1fr);align-items:center;gap:8px;color:#aebde0;font-size:10px}.tutor-inline-memory select,.tutor-inline-memory textarea{width:100%;border:1px solid #4c5d91;border-radius:7px;padding:7px;background:#101c3b;color:#e7eeff;font:inherit;font-size:11px}.tutor-inline-memory textarea{min-height:42px;resize:vertical}.tutor-inline-memory>small{color:#aab9de;font-size:10px;line-height:1.5}.tutor-inline-memory>footer{display:flex;justify-content:flex-end;gap:7px}.tutor-inline-memory>footer button{border:1px solid #7061bd;border-radius:7px;padding:6px 9px;background:#282057;color:#e5eaff;font-size:10px;cursor:pointer}.tutor-inline-memory>footer button:first-child{background:#6845e5;border-color:#8c72ff;color:#fff}.tutor-inline-memory button:disabled{opacity:.55;cursor:wait}.tutor-memory-saved{display:block;margin-top:10px;color:#82d8b6;font-size:11px}
.tutor-blackboard{position:relative;overflow:hidden;background:radial-gradient(circle at 88% 12%,rgba(116,85,235,.18),transparent 32%),#0a172d!important}.tutor-blackboard:before{content:"";position:absolute;inset:0;pointer-events:none;opacity:.16;background:repeating-linear-gradient(0deg,transparent 0,transparent 28px,#7ea0bd 29px)}.tutor-blackboard>*{position:relative}.tutor-blackboard header{display:flex;align-items:center;justify-content:space-between}.tutor-blackboard header h2{font-family:"Noto Serif SC",serif}.tutor-blackboard header button{border:1px solid #4b6092;border-radius:7px;padding:6px 8px;background:#132548;color:#d9e5ff;cursor:pointer}.tutor-blackboard>p{margin:8px 0 10px!important;color:#91a8d2!important}.tutor-blackboard ol{display:grid;gap:8px;margin:0;padding:0;list-style:none;counter-reset:board}.tutor-blackboard li{position:relative;padding:8px 8px 8px 31px;border-left:2px solid #7d62df;background:rgba(14,30,58,.74);color:#e7edff;font:600 12px/1.65 ui-monospace,"Cascadia Mono","Microsoft YaHei",monospace;opacity:0;transform:translateY(5px);transition:opacity .35s ease,transform .35s ease}.tutor-blackboard li:before{counter-increment:board;content:counter(board);position:absolute;left:8px;top:9px;color:#bba9ff;font-size:10px}.tutor-blackboard li.visible{opacity:1;transform:none}.tutor-blackboard li.empty{padding-left:10px;border-left-color:#35507d;color:#9eb0d2;opacity:1;transform:none;font-family:inherit}.tutor-blackboard li.empty:before{display:none}
.lecture-recorder-dialog{width:min(520px,calc(100vw - 28px))}.lecture-recorder-dialog h2 i{margin-right:9px;color:#a88aff}.lecture-recorder-dialog label{display:grid;gap:6px;color:#b8c8ed;font-size:13px}.lecture-recorder-dialog input{box-sizing:border-box;width:100%;border:1px solid #384f91;border-radius:10px;padding:11px 13px;background:#0b1635;color:#eef3ff;font:inherit}.lecture-recorder-status{display:grid;place-items:center;gap:7px;min-height:118px;border:1px dashed #6251c9;border-radius:14px;background:radial-gradient(circle,rgba(118,80,240,.2),transparent 70%),#0d1c40}.lecture-recorder-status b{color:#fff;font:700 34px/1 ui-monospace,Consolas,monospace}.lecture-recorder-status span{color:#b9c9eb;font-size:13px}.lecture-recorder-dialog [data-lecture-start]{border-color:#8a68ff;background:#5133c6;color:#fff}.lecture-recorder-dialog [data-lecture-stop]{border-color:#d66b91;background:#53243b;color:#ffe5ee}.lecture-recorder-dialog [data-lecture-stop]:disabled{opacity:.48}

/* Classroom layout: the existing 3D avatar and live board now share one real
   blackboard stage, while all controls live in a compact tabbed side panel. */
.tutor-classroom-layout{grid-template-columns:minmax(0,1fr) minmax(390px,.42fr);align-items:stretch}.tutor-classroom-stage{min-width:0}.classroom-chalkboard{position:relative;isolation:isolate;min-height:calc(100vh - 210px);overflow:hidden;border:1px solid #5d4b32;border-radius:20px;background:#13291f url("assets/classroom-chalkboard.png") center/cover no-repeat;box-shadow:0 24px 55px rgba(0,0,0,.34)}.classroom-chalkboard:after{position:absolute;z-index:-1;inset:0;content:"";background:linear-gradient(90deg,rgba(5,13,22,.22),transparent 42%,rgba(5,13,22,.32))}.classroom-board-copy{position:absolute;z-index:4;top:7%;right:5%;width:min(54%,580px);max-height:77%;overflow:auto;border:0!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}.classroom-board-copy:before{display:none}.classroom-board-copy header{border-bottom:1px solid rgba(236,245,223,.42);padding-bottom:10px}.classroom-board-copy header h2{color:#fffdf1;font-size:25px;text-shadow:0 2px 3px rgba(0,0,0,.5)}.classroom-board-copy>p{color:#e4efd8!important;font-size:13px!important}.classroom-board-copy li{border-left-color:#f6cf5a;background:rgba(7,28,22,.47);color:#fffdf4;font-size:15px;line-height:1.75;text-shadow:0 1px 2px rgba(0,0,0,.5)}.classroom-board-copy li:before{color:#ffe183}.classroom-avatar{position:absolute;z-index:3;left:4%;bottom:5%;width:min(42%,365px);padding:0!important;border:0!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}.classroom-avatar>header{position:absolute;z-index:8;top:5px;left:6px;right:6px;border-radius:12px;padding:9px 11px;background:rgba(8,20,34,.68);backdrop-filter:blur(6px)}.classroom-avatar>header h2{font-size:16px}.classroom-avatar>header p{font-size:10px}.classroom-avatar .tutor-portrait{height:540px;background:transparent}.classroom-avatar .tutor-avatar-stage{display:none}.classroom-avatar .tutor-portrait>span{position:absolute;z-index:9;bottom:0;left:9%;right:9%;padding:10px 12px;border:1px solid rgba(255,255,255,.36);border-radius:13px;background:rgba(8,19,32,.76);color:#fff;text-align:center}.classroom-avatar .tutor-3d-avatar{z-index:6;inset:0 0 36px;border-radius:0;background:transparent}.classroom-avatar .tutor-3d-avatar iframe{background:transparent}.classroom-caption{position:absolute;z-index:7;right:5%;bottom:4%;display:flex;align-items:center;gap:9px;border:1px solid rgba(255,255,255,.38);border-radius:99px;padding:10px 14px;background:rgba(8,19,32,.75);color:#fff;font-size:12px;backdrop-filter:blur(5px)}.classroom-caption i{color:#ffe281}.tutor-side-panel{display:grid;grid-template-rows:auto minmax(0,1fr);min-height:calc(100vh - 210px);overflow:hidden;border:1px solid #2b4275;border-radius:20px;background:#0e1a38}.tutor-side-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:5px;border-bottom:1px solid #2b4275;padding:10px;background:#112248}.tutor-side-tabs button{border:0;border-radius:9px;padding:10px 6px;background:transparent;color:#aebfe5;font:700 12px inherit;cursor:pointer}.tutor-side-tabs button.active{background:#5738c2;color:#fff;box-shadow:0 8px 18px rgba(99,58,206,.28)}.tutor-side-tabs i{margin-right:5px}.tutor-side-panel .tutor-conversation{height:auto;min-height:0;border:0;border-radius:0;background:transparent}.tutor-side-panel .tutor-control{height:100%;overflow:auto;padding:15px}.tutor-side-panel .tutor-control>section{margin-bottom:13px}.tutor-side-panel .tutor-control>footer{padding-bottom:8px}.tutor-side-panel .avatar-controls{display:grid;grid-template-columns:1fr auto;gap:9px;border:1px solid #2b4275;border-radius:13px;padding:12px;background:#101f44}.tutor-side-panel .avatar-controls label{display:grid;gap:5px;color:#aebfe2;font-size:11px}.tutor-side-panel .avatar-controls select{width:100%;border:1px solid #385287;border-radius:8px;padding:8px;background:#102046;color:#e9efff;font:inherit}.tutor-side-panel .avatar-controls button{align-self:end;border:1px solid #496397;border-radius:8px;padding:8px;background:#182c58;color:#e5ecff;font:600 11px inherit;cursor:pointer}.tutor-side-panel .avatar-controls output{grid-column:1/-1;color:#91a8d2;font-size:10px}.tutor-side-panel .tutor-profile-features{margin:13px 0}.tutor-side-panel .tutor-control>footer button{cursor:pointer}.tutor-side-panel [hidden]{display:none!important}
@media(max-width:1180px){.tutor-classroom-layout{grid-template-columns:1fr}.tutor-side-panel{min-height:650px}.classroom-chalkboard{min-height:680px}.classroom-board-copy{width:52%}}@media(max-width:720px){.classroom-chalkboard{min-height:620px;background-position:center}.classroom-avatar{left:1%;width:49%;bottom:2%}.classroom-avatar .tutor-portrait{height:435px}.classroom-board-copy{top:5%;right:3%;width:55%;max-height:72%}.classroom-board-copy header h2{font-size:17px}.classroom-board-copy li{font-size:11px;padding:6px 6px 6px 27px}.classroom-caption{display:none}.tutor-side-tabs button{font-size:11px}.tutor-side-tabs i{display:none}}

/* The classroom occupies the available desktop width. Only the transcript
   scrolls, so a long conversation cannot stretch the board or the page. */
body[data-studyhub-view="tutor"] .layout{max-width:none!important;width:100%;padding:24px 32px 36px}
.master-tutor{min-width:0}
.tutor-classroom-layout{grid-template-columns:minmax(0,1fr) minmax(430px,36%);height:clamp(550px,calc(100dvh - 290px),880px);min-height:0;align-items:stretch}
.tutor-classroom-stage,.classroom-chalkboard{height:100%;min-height:0}
.classroom-board-copy{left:43%;right:5%;width:auto;max-height:78%}
.classroom-avatar{left:-1%;bottom:2%;width:48%;height:91%;overflow:visible;background:transparent!important}
.classroom-avatar .tutor-portrait{height:100%;margin:0;padding:0;overflow:visible;border:0;border-radius:0;background:transparent!important;box-shadow:none!important}
.classroom-avatar .tutor-avatar-stage{display:block;inset:0;overflow:visible;background:transparent}
.classroom-avatar .tutor-avatar-stage canvas{background:transparent}
.classroom-avatar .tutor-avatar-stage output{display:none}
.classroom-avatar .tutor-3d-avatar{inset:0;overflow:visible;background:transparent!important;box-shadow:none!important}
.classroom-avatar .tutor-3d-avatar iframe{background:transparent!important;pointer-events:none}
.classroom-avatar .tutor-3d-avatar small{display:none}
.tutor-side-panel{height:100%;min-height:0;min-width:0;grid-template-rows:54px minmax(0,1fr)}
.tutor-side-panel .tutor-conversation{height:100%;min-height:0;grid-template-rows:auto minmax(0,1fr) auto;overflow:hidden}
.tutor-side-panel .tutor-conversation>header{min-height:72px;padding:10px 14px;gap:8px}
.tutor-side-panel .tutor-session-actions select{max-width:150px}
.tutor-side-panel .conversation-scroll{min-height:0;overflow-y:auto;overflow-x:hidden;padding:14px}
.tutor-side-panel .tutor-message-box{grid-template-rows:minmax(54px,auto) auto;margin:0 12px 12px}
.tutor-voice-actions{display:inline-flex;align-items:center;gap:6px;margin-left:4px}
.tutor-voice-actions button{border:1px solid #526aa8;border-radius:8px;padding:7px 8px;background:#152a55;color:#dce8ff;font:600 11px inherit;cursor:pointer;white-space:nowrap}
.tutor-voice-actions .voice-button{display:inline-flex;width:auto;height:auto;align-items:center;justify-content:center;border-color:#9170ff;border-radius:8px;background:#382483;color:#fff;font-size:11px;box-shadow:0 0 14px rgba(118,81,255,.32)}
.tutor-voice-actions .voice-button.listening{border-color:#65e1bb;background:#124c46;box-shadow:0 0 16px rgba(76,225,184,.38)}
.tutor-voice-actions [data-tutor-voice-toggle].is-muted{border-color:#5d6f90;background:#1a2949;color:#b4c3de}
@media(max-width:560px){.tutor-side-panel .tutor-message-box footer{gap:5px}.tutor-voice-actions{gap:4px}.tutor-voice-actions button{padding:6px}.tutor-voice-actions .voice-button{font-size:10px}}

/* Dedicated AI classroom recorder: the waveform is driven by the microphone
   analyser while a recording is active, rather than being a decorative loop. */
.master-lecture{max-width:1240px;margin:0 auto;padding:10px 0 36px}.lecture-page-head span{color:#a88aff;font:700 11px/1 ui-monospace,Consolas,monospace;letter-spacing:.15em}.lecture-page-head h1{margin:9px 0 6px;color:#fff;font-size:34px}.lecture-page-head p{margin:0;color:#aebfe2}.lecture-studio{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(300px,.75fr);gap:22px;margin-top:24px}.lecture-recorder-card,.lecture-output-preview{border:1px solid #354f87;border-radius:22px;background:linear-gradient(145deg,#142957,#0a1735);box-shadow:0 20px 50px rgba(0,0,0,.27)}.lecture-stage{position:relative;display:grid;min-height:360px;place-items:center;overflow:hidden;border-radius:21px 21px 0 0;background:radial-gradient(circle at 50% 42%,rgba(117,84,242,.32),transparent 30%),radial-gradient(circle at 50% 50%,rgba(48,177,255,.16),transparent 52%),#0b193b;text-align:center}.lecture-stage:before{position:absolute;inset:0;content:"";background:repeating-linear-gradient(90deg,transparent 0,transparent 59px,rgba(126,159,224,.05) 60px),repeating-linear-gradient(0deg,transparent 0,transparent 59px,rgba(126,159,224,.05) 60px)}.lecture-wave-canvas{position:absolute;inset:0;width:100%;height:100%;opacity:0;transition:opacity .35s}.lecture-stage[data-lecture-stage="recording"] .lecture-wave-canvas,.lecture-stage[data-lecture-stage="processing"] .lecture-wave-canvas{opacity:1}.lecture-orbit{position:absolute;border:1px solid rgba(165,142,255,.25);border-radius:50%;transition:all .35s}.orbit-one{width:220px;height:220px}.orbit-two{width:310px;height:310px}.lecture-stage[data-lecture-stage="recording"] .lecture-orbit{border-color:rgba(164,131,255,.68);animation:lectureOrbit 2.1s ease-in-out infinite}.lecture-stage[data-lecture-stage="recording"] .orbit-two{animation-delay:.35s}.lecture-stage[data-lecture-stage="processing"] .lecture-orbit{border-color:rgba(87,231,190,.6);animation:lectureOrbit 1.2s ease-in-out infinite}.lecture-record-button{position:relative;z-index:2;display:grid;place-items:center;width:142px;height:142px;border:1px solid #b394ff;border-radius:50%;background:radial-gradient(circle at 36% 26%,#8c72ff,#4528ae);color:#fff;cursor:pointer;box-shadow:0 0 0 12px rgba(123,91,245,.1),0 0 42px rgba(111,76,255,.45)}.lecture-record-button:hover{transform:translateY(-2px);box-shadow:0 0 0 15px rgba(123,91,245,.13),0 0 52px rgba(111,76,255,.6)}.lecture-record-button:disabled{opacity:.5;cursor:wait;transform:none}.lecture-record-button i{font-size:27px}.lecture-record-button b{margin-top:6px;font-size:16px}.lecture-record-button small{margin-top:4px;color:#e3dcff;font-size:10px}.lecture-stage>p,.lecture-stage>time{position:absolute;z-index:2;left:0;right:0;margin:0}.lecture-stage>p{bottom:47px;color:#d7e3ff;font-size:13px}.lecture-stage>time{bottom:20px;color:#aebfff;font:700 16px ui-monospace,Consolas,monospace}.lecture-meta{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:18px}.lecture-meta label{display:grid;gap:7px;color:#b8c8ec;font-size:12px}.lecture-meta input{width:100%;box-sizing:border-box;border:1px solid #3c5792;border-radius:9px;padding:10px;background:#0d1b3d;color:#ecf2ff;font:inherit}.lecture-recorder-card>footer{display:flex;align-items:center;gap:13px;border-top:1px solid #2a4375;padding:15px 18px}.lecture-recorder-card>footer button{border:1px solid #8d6dff;border-radius:10px;padding:11px 14px;background:#5535c5;color:#fff;font:700 13px inherit;cursor:pointer}.lecture-recorder-card>footer button:disabled{opacity:.45;cursor:not-allowed}.lecture-recorder-card>footer small{color:#91a5cf;font-size:11px;line-height:1.5}.lecture-output-preview{padding:22px}.lecture-output-preview>header{display:flex;gap:12px;align-items:flex-start}.lecture-output-preview>header>i{display:grid;place-items:center;width:38px;height:38px;border-radius:11px;background:#412889;color:#e2d9ff}.lecture-output-preview h2{margin:0;color:#fff;font-size:19px}.lecture-output-preview p{margin:5px 0 0;color:#aabce0;font-size:12px;line-height:1.6}.lecture-output-preview ol{display:grid;gap:10px;margin:22px 0 0;padding:0;list-style:none}.lecture-output-preview li{display:flex;gap:11px;align-items:center;border:1px solid #304b80;border-radius:12px;padding:12px;background:rgba(13,29,65,.7)}.lecture-output-preview li>i{display:grid;place-items:center;width:31px;height:31px;border-radius:9px;background:#1c3f75;color:#a9c8ff}.lecture-output-preview li:nth-child(2)>i{background:#39409a;color:#d1c5ff}.lecture-output-preview li:nth-child(3)>i{background:#145e5b;color:#82f0ca}.lecture-output-preview li:nth-child(4)>i{background:#6a4921;color:#ffe099}.lecture-output-preview li span{display:grid;gap:3px}.lecture-output-preview li b{color:#edf3ff;font-size:13px}.lecture-output-preview li small{color:#9fb2d8;font-size:11px;line-height:1.45}@keyframes lectureOrbit{0%,100%{transform:scale(.92);opacity:.42}50%{transform:scale(1.1);opacity:1}}@media(max-width:900px){.lecture-studio{grid-template-columns:1fr}.lecture-stage{min-height:320px}}@media(max-width:560px){.lecture-page-head h1{font-size:28px}.lecture-meta{grid-template-columns:1fr}.lecture-recorder-card>footer{display:grid}.lecture-stage{min-height:290px}.lecture-orbit.orbit-two{width:260px;height:260px}}
.tutor-side-panel .tutor-control{height:100%;min-height:0;overflow-y:auto}
.tutor-side-panel .message{max-width:94%;font-size:13px}
.tutor-side-panel .message.assistant{grid-template-columns:30px minmax(0,1fr)}
.tutor-side-panel .message.assistant>img{width:28px;height:28px}

/* Classroom scene: the rendered image supplies the room and the physical
   board; the editable title, derivation steps and Live2D tutor sit above it. */
.classroom-chalkboard{
  border-color:rgba(117,91,238,.64);
  border-radius:20px;
  background:#071125 url("assets/classroom-ai-background-v4.png") center/cover no-repeat;
  box-shadow:0 22px 54px rgba(1,5,23,.58),0 0 0 1px rgba(139,111,255,.08) inset;
}
.classroom-chalkboard:after{display:none}
.classroom-board-copy{
  top:10%;
  left:38%;
  right:7%;
  width:auto;
  max-height:69%;
  padding:0 1.5% 0 0;
  scrollbar-width:thin;
  scrollbar-color:rgba(255,226,132,.72) rgba(8,25,20,.22);
}
.classroom-board-copy::-webkit-scrollbar{width:6px;height:6px}
.classroom-board-copy::-webkit-scrollbar-track{background:rgba(8,25,20,.22);border-radius:99px}
.classroom-board-copy::-webkit-scrollbar-thumb{background:rgba(255,226,132,.72);border-radius:99px}
.classroom-board-copy header{padding:0 0 11px}
.classroom-board-copy header h2{font-size:clamp(22px,2vw,32px);letter-spacing:.03em}
.classroom-board-copy>p{margin:12px 0 13px;color:#eaf4e2!important;font-size:clamp(12px,1vw,15px)!important}
.classroom-board-copy li{
  margin:13px 0;
  border:0;
  border-left:0;
  border-radius:0;
  padding:2px 4px 4px 38px;
  background:transparent;
  box-shadow:none;
  color:#fffef2;
  font-family:"KaiTi","STKaiti","Noto Serif SC",serif;
  font-size:clamp(14px,1.22vw,19px);
  font-weight:600;
  letter-spacing:.035em;
  line-height:1.58;
  text-shadow:0 1px 1px rgba(0,0,0,.44),0 0 2px rgba(255,255,235,.26);
}
.classroom-board-copy li:before{
  top:4px;
  left:2px;
  display:grid;
  width:24px;
  height:24px;
  place-items:center;
  border:1px solid rgba(255,242,170,.72);
  border-radius:50%;
  color:#fff0a3;
  font-family:"Cascadia Mono",monospace;
  font-size:11px;
}
.classroom-board-copy li.visible{animation:chalkWrite .46s ease-out both}
.classroom-board-copy li.is-current{color:#fffff3;animation:chalkWrite .46s ease-out both,currentLineGlow 1.15s ease-in-out 2}
.classroom-board-copy li mark{
  display:inline;
  padding:0 .12em;
  border-radius:3px;
  background:linear-gradient(180deg,transparent 52%,rgba(255,217,78,.5) 53%,rgba(255,217,78,.5) 88%,transparent 89%);
  color:#fff8b7;
  text-shadow:0 0 8px rgba(255,228,103,.55);
}
.classroom-board-copy li.is-current mark{animation:chalkHighlight 1s ease-in-out 3}
.classroom-board-copy li .chalk-formula{font-family:"Cascadia Mono","Noto Serif SC",serif;letter-spacing:0}
.classroom-board-copy li .chalk-keyword{color:#9ff7df;background:linear-gradient(180deg,transparent 52%,rgba(57,222,177,.38) 53%,rgba(57,222,177,.38) 88%,transparent 89%);text-shadow:0 0 9px rgba(100,255,204,.62)}
@keyframes chalkWrite{from{opacity:0;filter:blur(2px);transform:translateX(-12px)}to{opacity:1;filter:none;transform:none}}
@keyframes chalkHighlight{0%,100%{filter:brightness(1);box-shadow:none}50%{filter:brightness(1.45);box-shadow:0 0 13px rgba(255,227,105,.85)}}
@keyframes currentLineGlow{0%,100%{text-shadow:0 1px 1px rgba(0,0,0,.44),0 0 2px rgba(255,255,235,.26)}50%{text-shadow:0 1px 1px rgba(0,0,0,.44),0 0 13px rgba(255,243,151,.7)}}
.classroom-avatar{
  /* Live2D reserves transparent pixels under its feet. Keep the canvas low
     enough that the visible feet meet the classroom floor. */
  left:.5%;
  bottom:1%;
  width:34%;
  height:82%;
}
.classroom-avatar:after{
  position:absolute;
  z-index:-1;
  left:28%;
  right:23%;
  bottom:2%;
  height:18px;
  content:"";
  border-radius:50%;
  background:rgba(17,12,10,.34);
  filter:blur(7px);
}
.classroom-avatar .tutor-avatar-stage{filter:drop-shadow(0 9px 8px rgba(0,0,0,.2))}
.classroom-caption{right:7%;bottom:3%;background:rgba(9,18,39,.82);box-shadow:0 8px 24px rgba(0,0,0,.26)}
@media(max-width:1200px){
  .tutor-classroom-layout{grid-template-columns:1fr;height:auto}
  .tutor-classroom-stage,.classroom-chalkboard{height:690px}
  .tutor-side-panel{height:min(760px,calc(100dvh - 120px));min-height:560px}
}
@media(max-width:720px){
 body[data-studyhub-view="tutor"] .layout{padding:16px 12px 90px}
 .tutor-classroom-stage,.classroom-chalkboard{height:600px}
 .classroom-avatar{left:0;width:42%;height:75%;bottom:0}
 .classroom-board-copy{left:44%;right:3%;width:auto;max-height:75%}
 .tutor-side-panel{height:min(720px,calc(100dvh - 95px))}
}

/* Blackboard interaction controls stay on the stage, so learners can steer
   the explanation without opening the configuration panel. */
.tutor-board-header-actions{display:flex;align-items:center;gap:7px}
.classroom-board-copy .tutor-board-actions{display:flex;flex-wrap:wrap;gap:7px;margin:12px 0 7px;padding:0;border:0;background:transparent}
.classroom-board-copy .tutor-board-actions button{border:1px solid rgba(231,239,217,.38);border-radius:999px;padding:7px 10px;background:rgba(8,25,34,.63);color:#eff7e8;font:700 11px inherit;cursor:pointer;backdrop-filter:blur(5px);transition:transform .18s ease,border-color .18s ease,background .18s ease}
.classroom-board-copy .tutor-board-actions button:hover{transform:translateY(-1px);border-color:#ffe487;background:rgba(89,76,30,.58)}
.classroom-board-copy .tutor-board-actions button.active{border-color:#83e1cf;background:rgba(18,101,90,.72);color:#d5fff1;box-shadow:0 0 15px rgba(85,222,192,.22)}
.classroom-board-copy .tutor-board-actions button:last-child{border-color:rgba(172,143,255,.75);background:rgba(64,42,132,.58)}
.classroom-board-copy .tutor-board-status{display:block;min-height:17px;margin:0 0 9px;color:#c9e6d2;font-size:11px;letter-spacing:.03em}
.classroom-board-copy .tutor-board-status:before{content:'●';margin-right:6px;color:#7ee7bf;font-size:8px}
@media(max-width:720px){.classroom-board-copy .tutor-board-actions{gap:5px;margin-top:8px}.classroom-board-copy .tutor-board-actions button{padding:5px 7px;font-size:9px}.classroom-board-copy .tutor-board-status{font-size:9px}}