.login-top{background:#123f6d;color:#fff;border-color:#123f6d}.workspace{display:grid;grid-template-columns:250px minmax(0,1fr);gap:24px;max-width:1500px;margin:0 auto;padding:28px}.workspace[hidden],.workspace [hidden],.authenticated #loginButton{display:none!important}.authenticated main>section:not(#workspace),.authenticated main>.workflow{display:none}.workspace-nav{position:sticky;top:18px;align-self:start;min-height:calc(100vh - 36px);padding:28px 20px;border-radius:24px;background:#102f50;color:#fff;display:flex;flex-direction:column;gap:28px}.workspace-nav h2{font-size:1.55rem}.workspace-nav .muted{color:#c8d8e7}.workspace-nav nav{display:grid;gap:8px}.workspace-nav nav button{border:0;text-align:left;padding:12px 14px;border-radius:12px;background:transparent;color:#dfeaf5;font-weight:700}.workspace-nav nav button:hover,.workspace-nav nav button.active{background:#fff;color:#123f6d}.workspace-content{min-width:0}.workspace-head,.panel-head{display:flex;align-items:center;justify-content:space-between;gap:16px}.workspace-head{margin-bottom:20px}.workspace-view{display:none}.workspace-view.active{display:block}.metric-grid,.admin-grid,.authoring-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-bottom:18px}.metric{padding:22px;border-radius:18px;background:linear-gradient(135deg,#fff,#edf6ff);border:1px solid #d5e3ef;box-shadow:0 8px 25px #123f6d0f}.metric strong{display:block;font-size:2rem;color:#123f6d}.metric span{color:#607386}.panel{background:#fff;border:1px solid #dce7ef;border-radius:20px;padding:22px;margin-bottom:18px;box-shadow:0 8px 28px #173c5d0c}.panel h3{margin-bottom:16px}.split-layout{display:grid;grid-template-columns:1fr 1fr;gap:18px}.stack-form,.grid-form{display:grid;gap:13px}.grid-form{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-form .wide{grid-column:1/-1}.stack-form label,.grid-form label,.login-dialog label{display:grid;gap:6px;font-weight:700;color:#29485f}.stack-form input,.stack-form select,.stack-form textarea,.grid-form input,.grid-form select,.grid-form textarea,.login-dialog input{width:100%;border:1px solid #bfd0dc;border-radius:10px;padding:10px 12px;background:#fff;color:#162f42}.stack-form select[multiple]{min-height:120px}.item-list{display:grid;gap:10px}.item-card{width:100%;border:1px solid #d7e4ed;border-radius:14px;padding:14px;text-align:left;background:#f9fcfe;color:#17384f}.item-card:hover{border-color:#3982b9;background:#f1f8fd}.item-card strong,.item-card span{display:block}.item-card span,.muted{color:#6a7f8f;font-size:.9rem}.badge{display:inline-block!important;width:auto;padding:3px 8px;border-radius:999px;background:#e8f4ff;color:#176294;font-size:.75rem}.text-button{border:0;background:transparent;color:#176ca5;font-weight:700}.progress-list{display:grid;gap:10px}.progress-row{display:grid;grid-template-columns:130px 1fr 54px;gap:12px;align-items:center}.progress-track{height:10px;border-radius:20px;background:#e5edf3;overflow:hidden}.progress-track i{display:block;height:100%;background:linear-gradient(90deg,#2d87be,#25a57a)}.ai-result,.secret-result{white-space:pre-wrap;word-break:break-word;min-height:110px;background:#102f50;color:#ecf7ff;border-radius:14px;padding:16px;overflow:auto}.secret-result{background:#fff7de;color:#654b00;border:1px solid #ead18a}.record-controls{display:flex;gap:10px;margin:18px 0}.table-wrap{overflow:auto}.data-table{width:100%;border-collapse:collapse}.data-table th,.data-table td{padding:10px;border-bottom:1px solid #e2e9ee;text-align:left;white-space:nowrap}.login-dialog{width:min(430px,calc(100vw - 30px))}.login-dialog form{display:grid;gap:16px}.full{width:100%}.privacy-short{font-size:.82rem;color:#71818c}.question-block{padding:16px;border:1px solid #d9e5ed;border-radius:14px;margin:12px 0}.question-block label{display:block;margin:8px 0}.question-block input[type=text]{width:100%;padding:9px;border:1px solid #bdd0dc;border-radius:9px}#workspaceNotice{color:#176d51;font-weight:700}.error{color:#b42318!important}.course-detail article{padding:14px 0;border-bottom:1px solid #e2e9ee}
@media(max-width:1050px){.workspace{grid-template-columns:1fr}.workspace-nav{position:static;min-height:auto}.workspace-nav nav{grid-template-columns:repeat(3,1fr)}.metric-grid,.admin-grid,.authoring-grid{grid-template-columns:1fr 1fr}.split-layout{grid-template-columns:1fr}}
@media(max-width:680px){.workspace{padding:14px}.workspace-nav{min-height:auto;padding:20px;gap:16px}.workspace-nav nav{grid-template-columns:1fr 1fr}.workspace-nav nav button{padding:10px}.metric-grid,.admin-grid,.authoring-grid,.grid-form{grid-template-columns:1fr}.progress-row{grid-template-columns:90px 1fr 45px}.top-actions .status{display:none}}
.grade-row{display:grid;grid-template-columns:110px minmax(180px,1fr) auto;gap:10px;align-items:end;margin-top:12px;padding-top:12px;border-top:1px solid #d7e4ed}.grade-row label{display:grid;gap:5px;font-weight:700}.grade-row input{width:100%;padding:9px;border:1px solid #bdd0dc;border-radius:9px}
@media(max-width:680px){.grade-row{grid-template-columns:1fr}}
.course-filters{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:0 0 14px}.course-filters label{display:grid;gap:5px;font-size:.82rem;font-weight:700;color:#476276}.course-filters select,#speechLanguage{width:100%;border:1px solid #bfd0dc;border-radius:10px;padding:9px 10px;background:#fff;color:#162f42}
@media(max-width:680px){.course-filters{grid-template-columns:1fr}}
.category-chip-list{display:flex;flex-wrap:wrap;gap:8px}.category-chip{display:inline-flex;gap:7px;align-items:center;padding:7px 10px;border-left:4px solid var(--category-color);border-radius:9px;background:#f4f7fa;color:#17384f}.category-chip small{color:#71818c;font-family:ui-monospace,monospace}

/* Login-only public surface, inspired by the restrained Windows Server sign-in visual language. */
body:not(.authenticated){background:#07182b;overflow-x:hidden}
body:not(.authenticated)>.topbar,body:not(.authenticated)>footer,body:not(.authenticated) main>section:not(#loginShell){display:none!important}
.authenticated #loginShell{display:none!important}
.server-login-shell{position:relative;min-height:100vh;display:grid;grid-template-columns:minmax(300px,1fr) minmax(420px,560px);align-items:center;gap:clamp(40px,9vw,150px);padding:clamp(36px,7vw,100px);color:#fff;background:radial-gradient(circle at 12% 82%,rgba(0,120,215,.26),transparent 32%),radial-gradient(circle at 82% 10%,rgba(33,150,243,.18),transparent 28%),linear-gradient(135deg,#061526 0%,#0b2845 58%,#071b31 100%);isolation:isolate}
.server-login-shell:before{content:"";position:absolute;inset:0;z-index:-1;opacity:.14;background-image:linear-gradient(rgba(255,255,255,.18) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.14) 1px,transparent 1px);background-size:56px 56px;mask-image:linear-gradient(110deg,#000,transparent 72%)}
.server-login-brand{max-width:680px}.server-login-brand h2{font-size:clamp(36px,5vw,70px);line-height:1.08;letter-spacing:-.035em;margin:22px 0 16px;overflow-wrap:anywhere}.server-login-brand>p:last-child{color:#b8cee2;font-size:19px}.server-edition,.server-kicker{font-size:12px;font-weight:800;letter-spacing:.18em;color:#75bfff}.windows-mark{display:grid;grid-template-columns:repeat(2,38px);grid-template-rows:repeat(2,38px);gap:5px;width:max-content;transform:perspective(140px) rotateY(-7deg)}.windows-mark i{display:block;background:#1689da;box-shadow:0 0 28px rgba(22,137,218,.22)}
.server-login-card{width:100%;padding:42px;border:1px solid rgba(157,199,231,.24);border-radius:4px;background:rgba(7,27,48,.92);box-shadow:0 28px 80px rgba(0,0,0,.42);backdrop-filter:blur(18px)}.server-login-card h2{font-size:30px;margin:4px 0 28px}.server-login-card label{display:grid;gap:8px;margin:15px 0;color:#d6e5f1;font-size:13px}.server-login-card input{margin:0;border:1px solid #51718b;border-radius:2px;padding:14px;background:#f7fbff;color:#0b2134;outline:none}.server-login-card input:focus{border-color:#39a7f0;box-shadow:0 0 0 2px rgba(57,167,240,.24)}.account-avatar{position:relative;width:72px;height:72px;border-radius:50%;margin:0 0 22px;background:#e8f2fa;overflow:hidden}.account-avatar span{position:absolute;width:24px;height:24px;border-radius:50%;background:#5d7d95;left:24px;top:13px}.account-avatar i{position:absolute;width:46px;height:28px;border-radius:50% 50% 0 0;background:#5d7d95;left:13px;bottom:7px}.server-login-button{width:100%;min-height:48px;margin-top:6px;border:1px solid #48a9e8;border-radius:2px;background:#0878bd;color:#fff;font:inherit;font-weight:800;cursor:pointer}.server-login-button:hover{background:#0c8bd7}.server-login-button:disabled{opacity:.65;cursor:wait}.login-message{min-height:22px;margin:8px 0;color:#ffcf70;font-weight:700}.login-security-note{display:flex;gap:10px;margin-top:24px;padding-top:18px;border-top:1px solid rgba(180,210,232,.18);color:#a9bfd1;font-size:12px;line-height:1.6}.login-security-note i{flex:0 0 8px;height:8px;border-radius:50%;margin-top:5px;background:#46c77b;box-shadow:0 0 0 4px rgba(70,199,123,.12)}.login-privacy{display:inline-block;margin-top:16px;color:#77bff0;font-size:12px}.server-login-footer{position:absolute;left:clamp(36px,7vw,100px);right:clamp(36px,7vw,100px);bottom:24px;display:flex;justify-content:space-between;color:#7190aa;font-size:11px;letter-spacing:.08em}
.permission-matrix{display:grid;gap:14px;margin:18px 0}.permission-module{border:1px solid #d9e5ee;border-radius:14px;overflow:hidden}.permission-module h4{margin:0;padding:11px 14px;background:#edf5fb;color:#173f5f;text-transform:uppercase;font-size:12px;letter-spacing:.08em}.permission-items{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 14px;padding:8px 14px}.permission-item{display:grid;grid-template-columns:auto 1fr;gap:10px;align-items:start;padding:10px 0;border-bottom:1px solid #edf1f4}.permission-item input,.permission-item select{margin:2px 0 0}.permission-item strong,.permission-item small{display:block}.permission-item small{color:#6b7f8e;line-height:1.45}.risk-critical{color:#a92a23}.risk-sensitive{color:#9a6300}
@media(max-width:850px){.server-login-shell{grid-template-columns:1fr;padding:34px 20px 80px}.server-login-brand{display:none}.server-login-card{max-width:520px;margin:auto;padding:30px}.server-login-footer{left:20px;right:20px}.permission-items{grid-template-columns:1fr}}

/* Visual virtual classroom */
.classroom-toolbar{display:flex;align-items:center;justify-content:space-between;gap:24px}.classroom-toolbar h3{margin-bottom:5px}.classroom-join-controls{display:flex;align-items:end;justify-content:flex-end;gap:10px;flex-wrap:wrap}.classroom-join-controls label{display:grid;gap:6px;min-width:230px;color:#29485f;font-weight:700}.classroom-join-controls select{border:1px solid #bfd0dc;border-radius:10px;padding:10px;background:#fff}.classroom-live-badge{display:inline-flex;align-items:center;gap:7px;padding:9px 12px;border-radius:99px;background:#e8eef4;color:#526678;font-weight:800;font-size:.78rem}.classroom-live-badge i{width:9px;height:9px;border-radius:50%;background:#8797a5}.classroom-live-badge.live{background:#e8fff2;color:#087446}.classroom-live-badge.live i{background:#12a766;box-shadow:0 0 0 6px #12a76620;animation:vc-pulse 1.8s infinite}
.virtual-classroom-stage{position:relative;isolation:isolate;min-height:650px;margin-bottom:18px;overflow:hidden;border:1px solid #9fb5c7;border-radius:26px;background:linear-gradient(#e8f1f6 0 67%,#a77a52 67%);box-shadow:0 22px 60px #102f5030,inset 0 1px #fff}.virtual-classroom-stage:before{content:"";position:absolute;z-index:-1;inset:0 0 31%;background:repeating-linear-gradient(90deg,#cfdee7 0 2px,#edf5f9 2px 52px)}.vc-ceiling{position:absolute;z-index:1;inset:0 0 auto;height:42px;background:linear-gradient(#fff,#d9e5ec);border-bottom:2px solid #b7cad6;display:flex;justify-content:space-around}.vc-ceiling i{width:150px;height:10px;margin-top:11px;border-radius:50%;background:#fff;box-shadow:0 0 22px 8px #fff}.vc-window{position:absolute;z-index:1;left:3%;top:10%;width:18%;height:38%;overflow:hidden;border:10px solid #eef5f8;background:linear-gradient(#71c5ef,#d9f2ff 70%,#91b977 71%);box-shadow:0 5px 15px #18394e33}.vc-window:before,.vc-window:after{content:"";position:absolute;z-index:4;background:#eef5f8}.vc-window:before{left:48%;width:7px;height:100%}.vc-window:after{top:49%;width:100%;height:7px}.vc-window>i,.vc-window>b{position:absolute;bottom:-2px;border-radius:50% 50% 0 0;background:#4b8c56}.vc-window>i{left:-10%;width:75%;height:30%}.vc-window>b{right:-14%;width:78%;height:42%;background:#39774b}.vc-sun{position:absolute;top:11%;right:13%;width:30px;height:30px;border-radius:50%;background:#ffe07a;box-shadow:0 0 18px #ffe17d}.vc-cloud{position:absolute;width:40px;height:12px;border-radius:30px;background:#fff}.vc-cloud:before,.vc-cloud:after{content:"";position:absolute;bottom:1px;border-radius:50%;background:#fff}.vc-cloud:before{left:7px;width:18px;height:18px}.vc-cloud:after{right:5px;width:22px;height:22px}.vc-cloud.one{left:8%;top:22%}.vc-cloud.two{left:43%;top:37%;transform:scale(.7)}
.vc-class-sign{position:absolute;z-index:3;left:24%;top:7%;display:flex;gap:11px;align-items:center;color:#23455d}.vc-class-sign span{font-weight:900}.vc-class-sign small{padding:4px 9px;border-radius:20px;background:#ffffffc7;color:#587083}.vc-blackboard{position:absolute;z-index:3;left:22%;top:13%;width:54%;height:48%;padding:21px 25px 28px;border:12px solid #8a5c39;border-radius:7px;background:radial-gradient(circle at 45% 35%,#315b53,#143a38 75%);box-shadow:0 10px 24px #112e3b4a,inset 0 0 35px #071e1b8f;color:#f5f5dd}.vc-board-header{display:flex;justify-content:space-between;padding-bottom:8px;border-bottom:1px solid #d7e7c43f;color:#bcd3bd;font:700 .64rem ui-monospace,monospace;letter-spacing:.1em}.vc-board-content{height:calc(100% - 27px);overflow:auto;padding:15px 12px;color:#fbf8dc;font-family:"Comic Sans MS","Segoe Print",cursive;text-shadow:0 0 2px #fff6}.vc-board-content h3{margin:4px 0 11px;color:#fff9b6;font-size:clamp(1.15rem,2vw,1.8rem)}.vc-board-content p{margin:5px 0;font-size:clamp(.8rem,1.2vw,1.05rem);line-height:1.5}.vc-chalk-kicker{color:#a4e5e1!important;font:800 .66rem ui-monospace,monospace!important;letter-spacing:.14em}.vc-equation{position:absolute;right:8%;bottom:15%;transform:rotate(-3deg);color:#d6edff;font-size:clamp(1rem,2.1vw,1.8rem);opacity:.72}.vc-board-line{position:relative;padding-left:17px}.vc-board-line:before{content:"›";position:absolute;left:0;color:#fbd46d}.vc-board-line.caption{color:#9ee9ff}.vc-board-pointer{position:absolute;z-index:6;left:70%;top:55%;width:15px;height:15px;border:3px solid #fff;border-radius:50%;background:#ff4d4d;box-shadow:0 0 0 7px #ff454530,0 0 14px #ff2e2e;animation:vc-pointer 1s infinite alternate}.vc-board-tray{position:absolute;left:-3%;right:-3%;bottom:-21px;height:10px;border-radius:3px;background:#70472e;box-shadow:0 4px 5px #18222b55}.vc-board-tray i{display:inline-block;width:30px;height:6px;margin:1px 6px;border-radius:2px;background:#fff}.vc-board-tray i:nth-child(2){background:#ffe06b}.vc-board-tray i:nth-child(3){background:#71ceea}.vc-board-tray b{position:absolute;right:12%;bottom:2px;width:50px;height:8px;background:#d9b698}
.vc-teacher-zone{position:absolute;z-index:8;right:2.5%;top:18%;width:23%;height:60%}.vc-speech{position:absolute;z-index:15;right:74%;top:-7%;width:240px;max-width:20vw;padding:13px 15px;border:2px solid #d1e0ea;border-radius:16px 16px 3px;background:#fff;color:#284a61;font-weight:700;font-size:.82rem;line-height:1.45;box-shadow:0 8px 22px #1a3b5138}.vc-speech:after{content:"";position:absolute;right:-13px;bottom:10px;border:8px solid transparent;border-left-color:#fff}.vc-teacher{position:absolute;left:50%;bottom:40px;width:154px;height:355px;transform:translateX(-50%);filter:drop-shadow(0 13px 8px #18394e3d)}.vc-teacher-halo{position:absolute;z-index:0;left:50%;top:-14px;width:164px;height:164px;transform:translateX(-50%);border:1px solid #4fd0ff69;border-radius:50%;background:radial-gradient(circle,#c9f1ff80,transparent 67%);animation:vc-halo 4s infinite}.vc-teacher-halo span{position:absolute;right:4px;top:21px;padding:4px 7px;border-radius:20px;background:#0b75a5;color:#fff;font:900 .62rem sans-serif;box-shadow:0 0 0 4px #fff}.vc-hair-back{position:absolute;z-index:2;left:39px;top:8px;width:79px;height:111px;border-radius:48% 48% 39% 39%;background:linear-gradient(130deg,#26222d,#4b3549)}.vc-neck{position:absolute;z-index:3;left:64px;top:103px;width:31px;height:42px;border-radius:12px;background:#d99b7d}.vc-head{position:absolute;z-index:5;left:43px;top:17px;width:72px;height:98px;border-radius:46% 46% 44%;background:linear-gradient(110deg,#f4c8a6,#e6ae8e);box-shadow:inset -7px -5px #cc8f7357}.vc-hair-front{position:absolute;z-index:5;left:-2px;top:-4px;width:75px;height:35px;border-radius:70% 40% 55% 18%;background:linear-gradient(145deg,#302433,#4a3549);transform:rotate(-5deg)}.vc-hair-front:after{content:"";position:absolute;right:-1px;top:15px;width:20px;height:45px;border-radius:50%;background:#403042;transform:rotate(-13deg)}.vc-ear{position:absolute;z-index:-1;top:45px;width:14px;height:21px;border-radius:50%;background:#e3a686}.vc-ear.left{left:-8px}.vc-ear.right{right:-8px}.vc-brow{position:absolute;z-index:7;top:41px;width:20px;height:3px;border-top:2px solid #64463e}.vc-brow.left{left:12px}.vc-brow.right{right:10px}.vc-eye{position:absolute;z-index:7;top:49px;width:17px;height:9px;overflow:hidden;border-radius:50%;background:#fff}.vc-eye.left{left:14px}.vc-eye.right{right:11px}.vc-eye i{position:absolute;left:6px;top:1px;width:6px;height:6px;border-radius:50%;background:#1c3545;box-shadow:inset 0 0 0 2px #527b91}.vc-nose{position:absolute;z-index:7;left:34px;top:55px;width:6px;height:15px;border-right:2px solid #b97e6b}.vc-mouth{position:absolute;z-index:7;left:27px;top:76px;width:23px;height:9px;overflow:hidden;border-radius:3px 3px 12px 12px;border-bottom:2px solid #a44f55;background:#fff}.vc-mouth i{position:absolute;left:4px;right:4px;bottom:-3px;height:5px;border-radius:50%;background:#d9797c}
.vc-body{position:absolute;z-index:4;left:18px;top:128px;width:122px;height:181px;border-radius:40px 40px 17px 17px;background:linear-gradient(100deg,#174c76,#2379a4 55%,#123e68);clip-path:polygon(17% 0,83% 0,100% 100%,0 100%)}.vc-shirt{position:absolute;left:43px;top:0;width:38px;height:77px;background:#f4fbff;clip-path:polygon(0 0,100% 0,70% 100%,50% 83%,30% 100%)}.vc-lapel{position:absolute;top:0;width:47px;height:70px;background:#123d65}.vc-lapel.left{left:10px;clip-path:polygon(0 0,100% 0,70% 100%,20% 45%)}.vc-lapel.right{right:8px;clip-path:polygon(0 0,100% 0,80% 45%,30% 100%)}.vc-badge{position:absolute;right:17px;top:72px;padding:3px 6px;border-radius:4px;background:#d6effa;color:#0a4568;font:900 .57rem sans-serif}.vc-arm{position:absolute;z-index:3;top:143px;width:38px;height:158px;border-radius:26px;background:#174b74;transform-origin:50% 12%}.vc-arm i{position:absolute;left:7px;bottom:-15px;width:24px;height:34px;border-radius:50%;background:#e2a485}.vc-arm.left{left:7px;transform:rotate(8deg)}.vc-arm.right{right:4px;transform:rotate(-39deg);animation:vc-gesture 5s infinite}.vc-arm.right i{transform:rotate(20deg)}.vc-pointer-stick{position:absolute;left:15px;bottom:-107px;width:3px;height:135px;border-radius:3px;background:#bdcfda;transform:rotate(3deg);transform-origin:top}.vc-teacher-card{position:absolute;z-index:12;left:50%;bottom:0;width:max-content;max-width:100%;padding:8px 13px;border:1px solid #c8dce8;border-radius:12px;background:#ffffffec;transform:translateX(-50%);text-align:center;box-shadow:0 6px 16px #24475d29}.vc-teacher-card strong,.vc-teacher-card span{display:block}.vc-teacher-card strong{color:#123f6d;font-size:.85rem}.vc-teacher-card span{color:#6b7e8d;font-size:.62rem}.vc-teacher.speaking .vc-mouth{height:15px;animation:vc-talk .19s infinite alternate}.vc-teacher.speaking .vc-arm.right{animation:vc-explain .9s infinite alternate}.vc-teacher.pointing .vc-arm.right{transform:rotate(-69deg)}
.vc-floor{position:absolute;z-index:0;left:-5%;right:-5%;bottom:-9%;height:44%;transform:perspective(460px) rotateX(61deg);transform-origin:top;background:repeating-linear-gradient(90deg,#0000 0 94px,#5f412b38 95px 97px),repeating-linear-gradient(0deg,#d0a073 0 58px,#825d3d66 59px 61px)}.vc-desk-row{position:absolute;z-index:6;left:3%;right:29%;display:flex;justify-content:space-around}.vc-desk-row.back{bottom:13%;transform:scale(.72);opacity:.9}.vc-desk-row.front{bottom:-4%}.vc-desk-row>div{position:relative;width:128px;height:55px;border-radius:5px;background:linear-gradient(#c99359,#81552f);box-shadow:0 7px 0 #694426,0 18px 18px #38251646}.vc-desk-row>div:before,.vc-desk-row>div:after{content:"";position:absolute;top:48px;width:8px;height:75px;background:#5c493b}.vc-desk-row>div:before{left:13px}.vc-desk-row>div:after{right:13px}.vc-desk-row i{position:absolute;left:48px;top:-52px;width:36px;height:42px;border-radius:50%;background:#353c4a;box-shadow:0 29px 0 8px #55728d}.vc-caption-bar{position:absolute;z-index:20;left:3%;right:3%;bottom:2%;min-height:49px;display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding:9px 14px;border:1px solid #c4d4df;border-radius:13px;background:#071b2be8;color:#fff;box-shadow:0 10px 25px #0616215c;backdrop-filter:blur(8px)}.vc-caption-label{padding:4px 8px;border-radius:5px;background:#1aa7d5;font-size:.68rem;font-weight:900}.vc-caption-bar p{margin:0;font-size:.86rem}.vc-caption-bar button{border:0;border-radius:8px;padding:6px 9px;background:#ffffff1a;color:#fff;cursor:pointer}
.classroom-control-grid{display:grid;grid-template-columns:minmax(220px,.8fr) minmax(300px,1.15fr) minmax(260px,1fr);gap:18px}.classroom-control-grid .panel{margin:0}.classroom-feed{max-height:310px;overflow:auto;display:grid;gap:8px}.classroom-feed article{padding:10px 12px;border-left:3px solid #28a1d4;border-radius:8px;background:#f3f9fc}.classroom-feed strong,.classroom-feed span{display:block}.classroom-feed strong{color:#23475e;font-size:.82rem}.classroom-feed span{margin-top:3px;color:#647987;font-size:.76rem}
.auto-teach-options{display:grid;grid-template-columns:1fr 110px;gap:10px}.cloud-ai-button{background:linear-gradient(135deg,#1267e8,#7147dc)!important;box-shadow:0 10px 25px #245edb45}.cloud-ai-button span{font-size:1.15rem}.cloud-ai-button:disabled{filter:grayscale(.65);box-shadow:none}.classroom-action-status{margin:13px 0;padding:10px 12px;border-radius:10px;background:#edf4fa;color:#31536a;font-size:.82rem;font-weight:700;line-height:1.45}.classroom-action-status.working{background:#fff4d6;color:#7c5700}.classroom-action-status.success{background:#e8fff2;color:#087446}.classroom-action-status.error{background:#fff0ef;color:#a72a22}.manual-teaching{margin-top:12px;border-top:1px solid #dce7ef;padding-top:12px}.manual-teaching summary{cursor:pointer;color:#315875;font-weight:800}.manual-teaching form{margin-top:13px}
.material-upload-zone{display:grid;gap:10px;margin:14px 0;padding:14px;border:1px dashed #88acd0;border-radius:14px;background:linear-gradient(145deg,#f5fbff,#f8f6ff)}.material-upload-zone>strong{color:#123c64}.material-upload-zone label{display:grid;gap:5px;font-size:.8rem;font-weight:800;color:#36536d}.material-upload-zone input,.material-upload-zone select{width:100%}.material-upload-zone .muted{margin:0;font-size:.75rem;line-height:1.45}.badge.cloud-ready{background:#e1f8ec;color:#087446}.badge.local-ready{background:#e5f1ff;color:#15559a}
@keyframes vc-pulse{50%{box-shadow:0 0 0 9px #12a76600}}@keyframes vc-halo{50%{transform:translateX(-50%) scale(1.04);opacity:.72}}@keyframes vc-talk{to{height:7px;transform:scaleX(.82)}}@keyframes vc-gesture{50%{transform:rotate(-45deg)}}@keyframes vc-explain{to{transform:rotate(-52deg)}}@keyframes vc-pointer{to{transform:scale(1.25)}}
@media(max-width:1200px){.virtual-classroom-stage{min-height:580px}.vc-blackboard{left:20%;width:55%}.vc-teacher-zone{right:1%;width:25%}.vc-speech{display:none}.classroom-control-grid{grid-template-columns:1fr 1fr}.classroom-feed-panel{grid-column:1/-1}}@media(max-width:760px){.classroom-toolbar,.classroom-join-controls{align-items:stretch;flex-direction:column}.classroom-join-controls label{min-width:0}.virtual-classroom-stage{min-height:620px;border-radius:17px}.vc-window{display:none}.vc-class-sign{left:5%;right:5%;top:7%;flex-direction:column;align-items:flex-start}.vc-blackboard{left:4%;top:15%;width:66%;height:43%;padding:15px;border-width:8px}.vc-teacher-zone{right:-2%;top:24%;width:34%;height:55%;transform:scale(.8);transform-origin:bottom center}.vc-desk-row{right:5%}.vc-desk-row>div:nth-child(3){display:none}.vc-caption-bar{grid-template-columns:auto 1fr}.classroom-control-grid{grid-template-columns:1fr}.classroom-feed-panel{grid-column:auto}}@media(prefers-reduced-motion:reduce){.virtual-classroom-stage *{animation:none!important;scroll-behavior:auto!important}}

/* v2.3 photorealistic recorded classroom */
.virtual-classroom-stage{background:#d8d2c8 url('/assets/classrooms/real-university-classroom-v1.png') center/cover no-repeat}.virtual-classroom-stage:before{display:none}.vc-ceiling,.vc-window,.vc-floor,.vc-desk-row{display:none}.vc-class-sign{top:3.8%;left:23%;padding:6px 12px;border-radius:12px;background:#fffdf1d9;backdrop-filter:blur(6px);box-shadow:0 4px 16px #382c2030}.vc-blackboard{left:23.7%;top:14%;width:50.3%;height:42%;padding:18px 23px;border-width:0;background:#14372fdd;box-shadow:inset 0 0 28px #04181499;color:#fff}.vc-board-tray{display:none}.vc-teacher-zone{right:2%;top:10%;width:24%;height:70%}.vc-teacher{width:240px;height:510px;bottom:12px;filter:drop-shadow(0 18px 12px #23180f4a)}.vc-teacher-photo{position:absolute;z-index:4;inset:0;width:100%;height:100%;object-fit:contain;object-position:center bottom;transform-origin:50% 92%;transition:transform .35s ease,filter .35s ease}.vc-photo-ai-badge{position:absolute;z-index:8;right:0;top:25%;padding:5px 8px;border-radius:999px;background:#067ca9;color:#fff;font-size:.64rem;font-weight:900;box-shadow:0 0 0 4px #fff}.vc-teacher-halo{left:54%;top:8%;width:170px;height:170px}.vc-teacher.has-photo.speaking .vc-teacher-photo{animation:vc-photo-talk .75s infinite alternate}.vc-teacher.has-photo.pointing .vc-teacher-photo{transform:translateX(-5px) rotate(-1.3deg)}.vc-teacher-card{bottom:-22px}.vc-caption-bar{background:#101b22ee}.vc-speech{top:9%;right:78%;max-width:22vw}.classroom-recording-panel{grid-column:1/-1}.recording-player-controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:12px 0}.recording-repeat{display:flex!important;align-items:center;gap:6px;margin:0}.button-link{display:inline-flex;align-items:center;justify-content:center;text-decoration:none}.button-link[aria-disabled="true"]{pointer-events:none;opacity:.45}.recording-timeline-row{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:10px}.recording-timeline-row input{width:100%;accent-color:#2563eb}.recording-timeline-row time{font:700 .76rem ui-monospace,monospace;color:#496173}.recording-segments{display:grid;gap:8px;max-height:280px;overflow:auto;margin-top:14px}.recording-segment{padding:10px 12px;border:1px solid #d8e3ec;border-radius:10px;background:#f8fbfd;cursor:pointer}.recording-segment.active{border-color:#2563eb;background:#eef5ff;box-shadow:inset 4px 0 #2563eb}.recording-segment strong,.recording-segment span{display:block}.recording-segment strong{color:#173e5a}.recording-segment span{margin-top:4px;color:#687d8e;font-size:.78rem}.teacher-admin-list{display:grid;gap:10px;margin-top:16px}.teacher-admin-card{display:grid;grid-template-columns:54px 1fr auto;align-items:center;gap:10px;padding:10px;border:1px solid #dae5ed;border-radius:12px;background:#f8fbfd}.teacher-admin-card img{width:54px;height:70px;object-fit:contain;border-radius:8px;background:#e7eef2}.teacher-admin-card strong,.teacher-admin-card small{display:block}.teacher-admin-actions{display:flex;gap:6px;flex-wrap:wrap}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:10px}@keyframes vc-photo-talk{from{transform:translateY(0) scale(1)}to{transform:translateY(-3px) scale(1.006)}}
@media(max-width:1200px){.vc-blackboard{left:22%;width:52%}.vc-teacher-zone{right:0;width:27%}.classroom-recording-panel{grid-column:1/-1}}
@media(max-width:760px){.virtual-classroom-stage{min-height:560px;background-position:42% center}.vc-blackboard{left:4%;top:17%;width:69%;height:39%}.vc-teacher-zone{right:-7%;top:19%;width:40%;height:59%}.vc-teacher{width:190px;height:410px}.vc-class-sign{left:4%;top:4%}.two-col{grid-template-columns:1fr}}
.vc-blackboard{background-color:#14372fdd;background-image:radial-gradient(circle at 20% 20%,#fff1 0 1px,transparent 2px),linear-gradient(105deg,#183f35ee,#0e2d27ee)}

/* v2.4 AI teacher recording studio: only the protected board, teacher and captions remain visible. */
.virtual-classroom-stage{min-height:700px;height:min(72vw,780px);background:linear-gradient(180deg,#f4f1ea 0 87%,#b78a58 87% 100%);border:1px solid #cfd9df;border-radius:22px;overflow:hidden}
.virtual-classroom-stage:after{content:"";position:absolute;left:0;right:0;bottom:12.7%;height:8px;background:#86613e;box-shadow:0 3px 10px #3f2b1d55}
.vc-ceiling,.vc-window,.vc-floor,.vc-desk-row,.vc-class-sign,.vc-speech,.vc-teacher-card,.vc-teacher-halo,.vc-board-tray{display:none!important}
.vc-blackboard{left:2.5%;top:5%;width:68%;height:79%;padding:24px 30px;border:14px solid #754b2d;border-radius:5px;background-color:#133d32;background-image:radial-gradient(circle at 17% 18%,#fff1 0 1px,transparent 2px),linear-gradient(110deg,#194c3eee,#0c3028f4);box-shadow:inset 0 0 42px #031a1499,0 9px 22px #39251644;z-index:2}
.vc-board-content{padding-bottom:12px}.vc-board-content h3{font-size:clamp(1.5rem,2.5vw,2.5rem)}.vc-board-line{font-size:clamp(1rem,1.5vw,1.45rem)}
.vc-teacher-zone{right:0;top:2%;width:28%;height:85%;z-index:5;pointer-events:none}
.vc-teacher{left:auto;right:0;bottom:0;width:100%;height:100%;filter:drop-shadow(0 16px 12px #271a1138)}
.vc-teacher-photo{left:0;width:100%;height:100%;object-fit:contain;object-position:center bottom;transform-origin:55% 95%;will-change:transform,opacity;transition:opacity .16s ease,transform .24s ease}
.vc-photo-ai-badge{right:7%;top:10%;font-size:.7rem}.vc-caption-bar{left:2%;right:2%;bottom:1.5%;z-index:12;background:#101b22f2;border:1px solid #d8e6ef55}
.vc-teacher.has-photo.speaking .vc-teacher-photo{animation:teacher-speaking 1.1s ease-in-out infinite alternate}
.vc-teacher.gesture-board_point .vc-teacher-photo{animation:teacher-point 1.8s ease-in-out infinite alternate}
.vc-teacher.gesture-explain .vc-teacher-photo,.vc-teacher.gesture-open_hand .vc-teacher-photo{animation:teacher-explain 1.5s ease-in-out infinite alternate}
.vc-teacher.gesture-nod .vc-teacher-photo{animation:teacher-nod 1.25s ease-in-out infinite}
.natural-voice-status{margin:.35rem 0 0;color:#17643b;font-size:.82rem;font-weight:750}.natural-voice-status.error{color:#b42318}
@keyframes teacher-speaking{from{transform:translateY(0) rotate(0)}to{transform:translateY(-2px) rotate(.25deg)}}
@keyframes teacher-point{from{transform:translateX(0) rotate(0)}to{transform:translateX(-7px) rotate(-.45deg)}}
@keyframes teacher-explain{from{transform:translateY(0) scale(1)}to{transform:translateY(-3px) scale(1.008)}}
@keyframes teacher-nod{0%,100%{transform:translateY(0) rotate(0)}45%{transform:translateY(4px) rotate(.7deg)}70%{transform:translateY(1px) rotate(-.3deg)}}
@media(max-width:900px){.virtual-classroom-stage{min-height:580px;height:72vw}.vc-blackboard{left:2%;width:70%;height:76%;padding:16px;border-width:9px}.vc-teacher-zone{width:35%;height:82%}.vc-teacher-photo{left:-24%;width:124%}.vc-caption-bar{bottom:1%}}

/* v2.6 paged blackboard and in-stage accessible player controls. */
.vc-stage-controls{position:absolute;z-index:30;top:1%;left:2%;right:2%;display:flex;justify-content:flex-end;align-items:center;gap:7px;pointer-events:auto}.vc-stage-controls button,.vc-stage-controls output{min-height:36px;border:1px solid #d7e4eb66;border-radius:9px;background:#0d1e29e8;color:#fff;padding:7px 11px;font:800 .75rem/1.1 inherit;box-shadow:0 4px 12px #0003;backdrop-filter:blur(8px)}.vc-stage-controls button{cursor:pointer}.vc-stage-controls button:hover:not(:disabled),.vc-stage-controls button[aria-pressed="true"]{background:#176ca0}.vc-stage-controls button:disabled{cursor:not-allowed;opacity:.42}.vc-stage-controls output{display:grid;place-items:center;min-width:92px;background:#f4fbffe8;color:#173e5a}.vc-blackboard{top:8%;height:76%}.vc-board-content{scrollbar-color:#d9cc89 #173e34}.vc-board-content h3{padding-bottom:8px;border-bottom:1px dashed #f7efaf66}.vc-board-sources{position:sticky;bottom:0;margin-top:14px!important;padding:7px 10px;border-radius:8px;background:#0a2722e8;color:#aee9df!important;font:700 .72rem/1.35 ui-monospace,monospace!important;text-shadow:none!important}.captions-hidden .vc-caption-bar{display:none!important}.virtual-classroom-stage:fullscreen{width:100vw;height:100vh;min-height:100vh;margin:0;border:0;border-radius:0;background:#f4f1ea}.virtual-classroom-stage:fullscreen .vc-stage-controls{top:1.5%;font-size:1rem}.virtual-classroom-stage:fullscreen .vc-blackboard{top:8%;height:78%;padding:30px 38px}.virtual-classroom-stage:fullscreen .vc-board-content h3{font-size:clamp(2rem,3vw,3.4rem)}.virtual-classroom-stage:fullscreen .vc-board-line{font-size:clamp(1.35rem,2vw,2.2rem)}.virtual-classroom-stage:fullscreen .vc-caption-bar{font-size:clamp(1rem,1.45vw,1.6rem)}
@media(max-width:900px){.vc-stage-controls{justify-content:flex-start;overflow-x:auto;white-space:nowrap}.vc-stage-controls button,.vc-stage-controls output{padding:6px 8px;font-size:.68rem}.vc-blackboard{top:14%;height:70%}.virtual-classroom-stage:fullscreen .vc-blackboard{top:13%;height:72%}}

/* v2.7 scripted pages, visible transcript and natural voice studio. */
.ai-teacher-admin{grid-column:1/-1}.ai-teacher-admin form{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:18px}.ai-teacher-admin form>label,.ai-teacher-admin form>.voice-preview-studio,.ai-teacher-admin form>button{grid-column:1/-1}.ai-teacher-admin form>.two-col{grid-column:span 1}.scripted-material-studio{margin:14px 0;border:1px solid #bdd4e5;border-radius:14px;background:#f8fbff}.scripted-material-studio>summary,.recording-transcript-panel>summary{cursor:pointer;padding:13px 15px;color:#173f63;font-weight:900}.scripted-material-studio>form{padding:0 14px 16px}.scripted-page-list{display:grid;gap:12px}.scripted-page-card{display:grid;gap:9px;padding:13px;border:1px solid #cbdde9;border-radius:12px;background:#fff}.scripted-page-card textarea{resize:vertical}.recording-segment p{margin:7px 0 0;color:#334f64;font-size:.82rem;line-height:1.55;white-space:normal}.recording-transcript-panel{margin-top:14px;border:1px solid #d5e2eb;border-radius:13px;background:#f8fbfd}.recording-transcript-panel>button{margin:0 14px 8px}.recording-transcript-panel pre{max-height:360px;overflow:auto;margin:0;padding:15px;border-top:1px solid #dce7ef;background:#102f50;color:#eef8ff;white-space:pre-wrap;word-break:break-word;font:500 .82rem/1.75 ui-monospace,monospace}.voice-preview-studio{display:grid;gap:10px;padding:14px;border:1px dashed #7eaed0;border-radius:13px;background:linear-gradient(145deg,#f2faff,#faf7ff)}.voice-preview-actions{display:flex;gap:8px;flex-wrap:wrap}.voice-preview-studio audio{width:100%;min-height:42px}.ai-teacher-admin input[type="range"]{padding:0;accent-color:#2563eb}@media(max-width:850px){.ai-teacher-admin form{grid-template-columns:1fr}.ai-teacher-admin form>.two-col{grid-column:1/-1}}

/* v2.8 topic-first material generation. */
.topic-template-callout{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:14px;align-items:center;padding:15px;border:1px solid #86b9e6;border-radius:13px;background:linear-gradient(135deg,#eaf7ff,#f4efff)}.topic-template-callout strong,.topic-template-callout span{display:block}.topic-template-callout strong{color:#123f6d;font-size:1rem}.topic-template-callout span{margin-top:5px;color:#536d80;font-size:.8rem;line-height:1.55}.topic-template-callout button{max-width:340px}
@media(max-width:760px){.topic-template-callout{grid-template-columns:1fr}.topic-template-callout button{max-width:none;width:100%}}

/* v2.8.1 persistent AI teacher save feedback. */
.stack-form label small{color:#6a7f8f;font-size:.75rem;font-weight:500;line-height:1.45}.form-status{margin:0;padding:10px 12px;border:1px solid #d8e4ec;border-radius:10px;background:#f6fafc;line-height:1.5}.form-status.working{border-color:#ead39b;background:#fff7dc;color:#755200}.form-status.success{border-color:#a9ddc1;background:#ebfff3;color:#087446}.form-status.error{border-color:#efbbb6;background:#fff1f0;color:#a72a22}
.voice-preview-studio p.working{color:#755200}.voice-preview-studio p.success{color:#087446}.voice-preview-studio p.error{color:#a72a22;font-weight:700}
.voice-guide-hero{display:flex;justify-content:space-between;gap:24px;align-items:center;background:linear-gradient(135deg,#f5f9ff,#eefbf8)}
.voice-guide-hero h2{margin:.2rem 0 .5rem}.voice-guide-summary{min-width:260px;display:grid;gap:8px;padding:18px;border-radius:16px;background:#fff;border:1px solid #cfe0f4}.voice-guide-summary span{color:var(--muted)}
.voice-guide-warning{margin:16px 0;padding:16px 18px;border-radius:14px;background:#fff6db;border:1px solid #f2d37b;color:#624b08}.voice-guide-warning p{margin:.35rem 0 0;line-height:1.65}
.voice-language-grid,.voice-setting-grid,.voice-license-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}
.voice-language-card,.voice-setting-grid article,.voice-license-grid article{padding:17px;border:1px solid #d7e2ef;border-radius:15px;background:#fff}.voice-language-card>div{display:flex;align-items:center;gap:9px}.voice-language-card>div strong{font-size:1.05rem}.voice-language-card p,.voice-setting-grid p,.voice-license-grid p{color:var(--muted);line-height:1.65;margin:.65rem 0}.voice-language-card dl{margin:0;display:grid;gap:7px}.voice-language-card dl div{display:grid;grid-template-columns:82px 1fr;gap:8px}.voice-language-card dt{font-weight:800;color:#32506f}.voice-language-card dd{margin:0;line-height:1.5}.voice-guide-steps{padding-left:1.5rem;line-height:1.85}.voice-guide-steps li+li{margin-top:.35rem}
@media(max-width:760px){.voice-guide-hero{align-items:stretch;flex-direction:column}.voice-guide-summary{min-width:0}}