:root{--navy:#0b355f;--navy-2:#082b4e;--red:#d6222f;--blue:#24679f;--sky:#eaf4fb;--ink:#15283b;--muted:#64778a;--line:#dce5ec;--bg:#f3f6f8;--white:#fff;--green:#1b9566;--shadow:0 8px 30px rgba(25,55,85,.09)}
*{box-sizing:border-box}html,body{height:100%;margin:0}body{font-family:"Be Vietnam Pro",system-ui,sans-serif;color:var(--ink);background:var(--bg);font-size:13px}button,textarea{font:inherit}button{cursor:pointer}.topbar{height:64px;background:var(--navy);color:#fff;display:flex;align-items:center;padding:0 24px;gap:36px;box-shadow:0 2px 9px rgba(0,0,0,.16);position:relative;z-index:5}.brand{font-size:25px;font-weight:800;color:#fff;text-decoration:none;letter-spacing:-1px}.brand span{color:#f02b38}.course-name{display:flex;align-items:center;gap:9px;font-size:13px}.course-name b{color:#afc7db;font-weight:500}.course-dot{width:6px;height:6px;background:#54c1eb;border-radius:50%}.top-actions{margin-left:auto;display:flex;align-items:center;gap:9px}.icon-button{height:36px;min-width:36px;border:1px solid rgba(255,255,255,.17);background:rgba(255,255,255,.06);color:#fff;border-radius:9px;position:relative}.icon-button i{position:absolute;width:6px;height:6px;border-radius:50%;background:var(--red);top:7px;right:7px}.language{padding:0 10px}.avatar{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:#e0ad80;color:#55301d;font-weight:700;margin-left:3px}
.workspace{height:calc(100vh - 64px);display:grid;grid-template-columns:218px minmax(470px,1fr) minmax(360px,420px);overflow:hidden}.sidebar{background:#fff;border-right:1px solid var(--line);padding:20px 14px;display:flex;flex-direction:column;overflow:auto}.sidebar nav{display:grid;gap:4px}.sidebar nav a{color:#50677b;text-decoration:none;padding:11px 12px;border-radius:8px;display:flex;gap:11px;align-items:center;font-weight:500}.sidebar nav a span{font-size:17px;width:20px;text-align:center}.sidebar nav a.active{background:#e9f2f9;color:var(--navy);font-weight:700}.section-label{font-size:9px;letter-spacing:1.2px;color:#91a1af;font-weight:700;padding:27px 10px 9px}.day-list{display:grid;gap:6px}.day-list button{border:0;background:transparent;text-align:left;border-radius:9px;padding:10px 8px;display:flex;align-items:center;gap:9px;color:#66798a;position:relative}.day-list button.current{background:#f1f6fa;color:var(--navy);box-shadow:inset 3px 0 var(--red)}.day-state{width:28px;height:28px;border:1px solid #cedae3;border-radius:7px;display:grid;place-items:center;font-size:10px;font-weight:700;flex:0 0 auto}.day-state.done{background:#e6f5ef;color:var(--green);border-color:#cce9de}.day-list b,.day-list small{display:block}.day-list b{font-size:11px;margin-bottom:3px}.day-list small{font-size:9px}.day-list em{position:absolute;right:8px;top:7px;font-size:7px;font-style:normal;color:var(--red);font-weight:700}.progress-card{margin-top:auto;background:#f5f8fa;border:1px solid var(--line);border-radius:10px;padding:13px}.progress-card>div:first-child{display:flex;justify-content:space-between;font-size:9px}.progress-card b{color:var(--navy)}.progress-track{height:5px;background:#dbe6ed;border-radius:3px;margin:10px 0 7px;overflow:hidden}.progress-track i{display:block;width:34%;height:100%;background:var(--red)}.progress-card small{font-size:8px;color:#8293a1}
.lesson-column{min-width:0;overflow-y:auto;padding:24px 28px 30px;scroll-behavior:smooth}.breadcrumb{font-size:10px;color:#8192a0;margin-bottom:18px}.breadcrumb span{padding:0 7px}.lesson-title-row{display:flex;align-items:flex-end;justify-content:space-between;gap:16px}.eyebrow{font-size:9px;letter-spacing:1.2px;font-weight:700;color:var(--blue);margin:0 0 8px}.lesson-title-row h1{font-size:22px;letter-spacing:-.5px;margin:0;color:var(--navy)}.read-status{background:#e5f4ee;color:#147b56;padding:7px 10px;border-radius:20px;font-size:9px;font-weight:600;white-space:nowrap}.read-status span{margin-right:5px}.viewer-card{margin-top:20px;background:white;border-radius:12px;border:1px solid var(--line);overflow:hidden;box-shadow:var(--shadow)}.pdf-toolbar{height:50px;display:flex;align-items:center;justify-content:space-between;padding:0 14px;border-bottom:1px solid var(--line);color:#5c7082;font-size:9px}.pdf-toolbar>div{display:flex;align-items:center;gap:8px}.pdf-icon{color:var(--red);border:1px solid #f2b9bd;background:#fff3f4;padding:4px 5px;border-radius:4px;font-weight:800;font-size:7px}.page-controls button{width:27px;height:27px;border:1px solid var(--line);background:#fff;color:#52697c;border-radius:6px}.page-controls span{padding:0 4px}.slide{aspect-ratio:16/9;margin:18px;background:linear-gradient(135deg,#fff 65%,#f2f7fa);border:1px solid #e2e8ed;padding:6.5% 7% 3.4%;position:relative;overflow:hidden;box-shadow:0 5px 20px rgba(30,50,70,.08)}.slide:before{content:"";position:absolute;right:-7%;top:-18%;width:36%;height:58%;border-radius:50%;background:linear-gradient(145deg,rgba(36,103,159,.08),rgba(214,34,47,.04))}.slide-kicker{color:var(--red);font-size:8px;font-weight:800;letter-spacing:1.4px;margin-bottom:2%}.slide h2{font-size:clamp(20px,2.2vw,35px);line-height:1.15;letter-spacing:-1px;color:var(--navy);margin:0 0 2%;max-width:80%}.slide-lead{font-size:clamp(9px,1vw,14px);line-height:1.55;color:#536a7d;max-width:80%;margin:0 0 4%}.slide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2%}.slide-card{border-top:3px solid var(--blue);background:#f5f8fb;padding:9% 8%;min-height:88px}.slide-card.red{border-color:var(--red)}.slide-card.green{border-color:var(--green)}.slide-card b{display:block;font-size:clamp(8px,.85vw,12px);color:var(--navy);margin-bottom:6px}.slide-card span{font-size:clamp(6px,.7vw,9px);line-height:1.5;color:#687c8c}.slide footer{position:absolute;bottom:3%;left:7%;right:7%;display:flex;justify-content:space-between;font-size:6px;letter-spacing:.8px;color:#9aa8b3}.lesson-note{font-size:9px;color:#6f8190;text-align:center;margin-top:13px}.lesson-note span{color:var(--blue);margin-right:4px}
.tutor-panel{display:flex;flex-direction:column;min-width:0;min-height:0;height:100%;overflow:hidden;background:#fff;border-left:1px solid var(--line);box-shadow:-5px 0 22px rgba(38,65,90,.05);position:relative}.tutor-header{height:66px;flex:0 0 auto;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 16px;gap:10px}.tutor-avatar,.mini-avatar{background:var(--navy);color:#fff;border-radius:10px;display:grid;place-items:center;font-weight:800}.tutor-avatar{width:38px;height:38px;font-size:16px;position:relative}.tutor-avatar span{font-size:7px;color:#ffbdc2;position:absolute;right:4px;top:3px}.tutor-header b,.tutor-header small{display:block}.tutor-header b{font-size:12px;color:var(--navy)}.tutor-header small{font-size:8px;color:#788b9b;margin-top:4px}.tutor-header small i{display:inline-block;width:5px;height:5px;border-radius:50%;background:#2aac74;margin-right:4px}.tutor-header button{margin-left:auto;border:0;background:transparent;color:#718594;font-size:18px}.connection-banner{margin:12px 14px 3px;border:1px solid #bfdfd2;background:#eff9f5;border-radius:9px;padding:10px 12px;display:flex;align-items:center;gap:9px;flex:0 0 auto}.connection-banner>span{width:22px;height:22px;border-radius:50%;background:#d6efe5;color:#16815b;display:grid;place-items:center;font-size:10px}.connection-banner b,.connection-banner small{display:block}.connection-banner b{font-size:9px;color:#17694d}.connection-banner small{font-size:7px;color:#6a887d;margin-top:3px}.chat{flex:1 1 auto;min-height:0;overflow-x:hidden;overflow-y:auto;overscroll-behavior:contain;scrollbar-gutter:stable;-webkit-overflow-scrolling:touch;padding:15px 14px 22px}.message{display:flex;gap:8px;margin-bottom:16px;animation:messageIn .25s ease}.mini-avatar{width:24px;height:24px;border-radius:7px;font-size:9px;flex:0 0 auto;margin-top:2px}.bubble{max-width:calc(100% - 30px);font-size:10px;line-height:1.65}.bubble>p{margin:0;background:#f2f6f9;border-radius:4px 12px 12px 12px;padding:10px 12px}.user-message{justify-content:flex-end}.user-message .bubble{background:var(--navy);color:#fff;border-radius:12px 4px 12px 12px;padding:9px 12px;max-width:82%}.quick-actions{display:grid;gap:7px;margin-top:8px}.quick-actions button{border:1px solid #dce6ed;background:#fff;border-radius:9px;padding:9px 10px;display:flex;align-items:center;gap:9px;text-align:left;color:var(--ink);transition:.15s}.quick-actions button:hover{border-color:#81a9c8;transform:translateY(-1px);box-shadow:0 4px 12px rgba(30,70,100,.08)}.quick-actions button>span{width:24px;height:24px;border-radius:6px;background:#eaf3f9;color:var(--blue);display:grid;place-items:center}.quick-actions b,.quick-actions small{display:block}.quick-actions b{font-size:9px}.quick-actions small{font-size:7px;color:#748897;margin-top:2px}.typing{display:flex!important;gap:4px;align-items:center;height:34px}.typing i{width:5px;height:5px;background:#7890a3;border-radius:50%;animation:bounce 1s infinite}.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}.summary-card{border:1px solid var(--line);border-radius:10px;overflow:hidden}.summary-head{padding:12px;background:linear-gradient(120deg,#0b355f,#175785);color:white}.summary-head small,.summary-head b{display:block}.summary-head small{font-size:7px;opacity:.7;letter-spacing:.8px}.summary-head b{font-size:11px;margin-top:4px}.summary-body{padding:3px 11px 10px}.summary-section{padding:10px 0;border-bottom:1px solid #e8eef2}.summary-section:last-child{border:0}.summary-section b{font-size:9px;color:var(--navy)}.summary-section p{margin:4px 0 7px;font-size:8px;color:#5d7182;line-height:1.55}.citation{border:0;background:#e7f1f8;color:var(--blue);border-radius:12px;padding:3px 7px;font-size:7px;font-weight:700}.citation:hover{background:var(--blue);color:white}.chat-list{margin:6px 0 0;padding-left:17px}.chat-list li{margin:5px 0;font-size:9px}.source-line{margin-top:8px;color:#708392;font-size:7px}
.process-drawer{position:absolute;left:10px;right:10px;bottom:82px;background:#fff;border:1px solid #cfdde7;border-radius:12px;box-shadow:0 15px 45px rgba(17,50,78,.2);z-index:4;padding:13px;transform:translateY(15px);opacity:0;pointer-events:none;transition:.25s}.process-drawer.open{transform:none;opacity:1;pointer-events:auto}.drawer-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px;color:var(--navy)}.drawer-heading>div{display:flex;gap:7px;align-items:center;font-size:10px}.drawer-heading>div span{color:var(--red)}.drawer-heading button{border:0;background:none;color:#738594;font-size:18px}.process-list{display:grid;gap:6px}.process-step{display:grid;grid-template-columns:20px 1fr auto;gap:8px;align-items:center;padding:6px;border-radius:7px;color:#718392}.process-step .step-icon{width:20px;height:20px;border:1px solid #cddae3;border-radius:50%;display:grid;place-items:center;font-size:8px}.process-step b,.process-step small{display:block}.process-step b{font-size:8px}.process-step small{font-size:6px;margin-top:2px}.process-step em{font-size:6px;font-style:normal}.process-step.active{background:#edf5fa;color:var(--blue)}.process-step.active .step-icon{border-color:var(--blue);animation:pulse 1s infinite}.process-step.done{color:#177d59}.process-step.done .step-icon{background:#dbf1e8;border-color:#b9e4d4}.process-note{background:#f4f7f9;border-radius:7px;padding:8px;font-size:7px;line-height:1.45;color:#667b8c;margin:9px 0 0}.process-note b{display:block;color:var(--navy);margin-bottom:2px}.composer{flex:0 0 auto;border-top:1px solid var(--line);padding:11px 13px 9px;background:#fff}.input-shell{display:flex;align-items:flex-end;border:1px solid #cddae4;border-radius:10px;padding:5px 5px 5px 10px;gap:5px}.input-shell:focus-within{border-color:#4a83ae;box-shadow:0 0 0 2px #e6f1f8}.input-shell textarea{border:0;outline:0;resize:none;min-height:29px;max-height:84px;line-height:1.45;padding:7px 0;width:100%;font-size:9px;color:var(--ink)}.input-shell button{border:0;background:var(--red);color:#fff;width:29px;height:29px;border-radius:7px;flex:0 0 auto;font-size:11px}.input-shell button:disabled,.input-shell textarea:disabled{opacity:.5;cursor:not-allowed}.model-meta{display:flex;justify-content:space-between;align-items:center;margin-top:7px}.model-meta button{border:0;background:none;color:#587085;font-size:7px;padding:0}.model-meta button span{color:var(--red)}.model-meta button i{font-style:normal;color:#93a2ad}.model-meta>span{font-size:7px;color:#a06725;background:#fff4df;border-radius:10px;padding:3px 7px}
.modal-backdrop{position:fixed;inset:0;background:rgba(5,27,47,.58);display:grid;place-items:center;z-index:20;padding:20px;backdrop-filter:blur(3px)}.modal-backdrop[hidden]{display:none}.modal{width:min(460px,100%);background:#fff;border-radius:16px;padding:28px;position:relative;box-shadow:0 24px 80px rgba(0,0,0,.3)}.modal-close{position:absolute;right:15px;top:13px;border:0;background:none;font-size:24px;color:#718391}.model-mark{width:42px;height:42px;display:grid;place-items:center;background:var(--navy);color:#ff9da4;border-radius:11px;margin-bottom:16px}.modal h2{margin:0;color:var(--navy);font-size:22px}.modal-intro{color:#667b8c;line-height:1.6;font-size:10px}.modal dl{margin:18px 0 0}.modal dl div{display:grid;grid-template-columns:115px 1fr;border-top:1px solid var(--line);padding:11px 0;font-size:9px}.modal dt{font-weight:700;color:var(--navy)}.modal dd{margin:0;color:#607585;line-height:1.5}.mock-badge{color:#9a621e;background:#fff2d8;padding:3px 6px;border-radius:8px;font-size:7px}
.real-slide-frame{aspect-ratio:4/3;margin:18px;background:#acb2bb;border:1px solid #e2e8ed;overflow:hidden;box-shadow:0 5px 20px rgba(30,50,70,.08)}
.real-slide-frame iframe{width:100%;height:100%;border:0;display:block;background:#acb2bb}
@keyframes messageIn{from{opacity:0;transform:translateY(5px)}}@keyframes bounce{0%,60%,100%{transform:none}30%{transform:translateY(-4px)}}@keyframes pulse{50%{box-shadow:0 0 0 4px rgba(36,103,159,.12)}}
@media(max-width:1100px){.workspace{grid-template-columns:minmax(430px,1fr) minmax(350px,400px)}.sidebar{display:none}.lesson-column{padding:20px}.slide{margin:12px}}
@media(max-width:820px){body{height:auto}.topbar{height:58px;padding:0 14px}.course-name{display:none}.workspace{height:auto;display:block;overflow:visible}.lesson-column{padding:18px 14px;overflow:visible}.tutor-panel{height:min(760px,calc(100vh - 24px));min-height:560px;border:1px solid var(--line);margin:0 10px 16px;border-radius:12px}.slide{padding:5%;margin:9px}.slide-grid{grid-template-columns:1fr;gap:5px}.slide-card{min-height:0;padding:5px 7px}.slide-card span{display:none}.lesson-title-row{align-items:flex-start;flex-direction:column}.read-status{align-self:flex-start}.pdf-toolbar>div:first-child b{max-width:150px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}}
@media(max-width:480px){.topbar{gap:10px}.icon-button.language{display:none}.lesson-title-row h1{font-size:18px}.slide h2{font-size:16px}.slide-lead{font-size:7px}.pdf-toolbar{padding:0 8px}.page-controls button:last-child{display:none}}