:root{--bg:#f4f6f8;--panel:#fff;--ink:#23313d;--muted:#75828d;--line:#e5eaf0;--blue:#315f83;--blue-2:#eaf2f8;--teal:#3c877e;--teal-2:#e8f3f0;--amber:#a86a1f;--amber-2:#fff4df;--red:#aa554b;--red-2:#fbefed;--shadow:0 8px 28px rgba(31,48,63,.06);--radius:16px}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}button,input,select{font:inherit}button{cursor:pointer} .app{min-height:100vh;display:grid;grid-template-columns:248px minmax(0,1fr)}
.sidebar{position:sticky;top:0;height:100vh;background:#fbfcfd;border-right:1px solid var(--line);padding:22px 16px;display:flex;flex-direction:column;gap:26px}.brand{display:flex;align-items:center;gap:11px;padding:0 8px}.brand-mark{width:36px;height:36px;border-radius:11px;background:linear-gradient(145deg,#345f80,#4a9186);display:grid;place-items:center;color:#fff;font-weight:700;letter-spacing:-1px}.brand-title{font-weight:700;font-size:15px}.brand-sub{color:var(--muted);font-size:11px;margin-top:1px}.nav-label{font-size:10px;letter-spacing:.08em;color:#9aa5ad;padding:0 11px 8px;text-transform:uppercase}.nav{display:grid;gap:4px}.nav button{border:0;background:transparent;color:#667581;text-align:left;padding:10px 11px;border-radius:10px;display:flex;align-items:center;gap:11px;transition:.15s}.nav button:hover{background:#f0f4f6;color:var(--ink)}.nav button.active{background:var(--blue-2);color:var(--blue);font-weight:650}.nav-glyph{width:20px;height:20px;border:1px solid currentColor;border-radius:6px;display:grid;place-items:center;font-size:10px;opacity:.78}.sidebar-bottom{margin-top:auto}.profile-mini{display:flex;align-items:center;gap:10px;padding:12px 9px;border-top:1px solid var(--line)}.avatar{width:34px;height:34px;border-radius:50%;background:#dce8ed;color:var(--blue);display:grid;place-items:center;font-weight:700}.profile-name{font-size:12px;font-weight:650}.profile-role{font-size:11px;color:var(--muted)}
.main{min-width:0;padding:26px clamp(18px,3vw,42px) 44px}.topbar{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px}.eyebrow{font-size:12px;color:var(--muted)}.topbar h1{font-size:24px;letter-spacing:-.03em;margin:3px 0 0;font-weight:700}.top-actions{display:flex;align-items:center;gap:10px}.date-chip,.demo-chip{border:1px solid var(--line);background:var(--panel);padding:8px 12px;border-radius:999px;color:#64737f;font-size:12px}.demo-chip{background:#f8f4e8;border-color:#efe2bf;color:#886a2a}.searchbox{width:210px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:9px 12px;color:var(--muted)}
.page{display:none}.page.active{display:block}.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin:23px 0 12px}.section-head h2{font-size:16px;margin:0;font-weight:700}.section-head p{margin:4px 0 0;font-size:12px;color:var(--muted)}.text-link{border:0;background:transparent;color:var(--blue);font-weight:600;font-size:12px}.btn{border:1px solid var(--line);background:#fff;color:#40515e;padding:9px 13px;border-radius:9px;font-weight:600;font-size:12px;transition:.15s}.btn:hover{border-color:#b9c8d3;background:#f9fbfc}.btn.primary{color:#fff;background:var(--blue);border-color:var(--blue)}.btn.primary:hover{background:#264c6a}.btn.teal{color:#fff;background:var(--teal);border-color:var(--teal)}.btn.small{padding:7px 10px;font-size:11px}.btn.ghost{background:transparent}.grid{display:grid;gap:14px}.stats{grid-template-columns:repeat(4,minmax(0,1fr));margin-bottom:18px}.stat-card,.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.stat-card{padding:16px 18px}.stat-label{font-size:12px;color:var(--muted)}.stat-value{font-size:27px;line-height:1.15;font-weight:700;margin:9px 0 5px;letter-spacing:-.04em}.stat-foot{font-size:11px;color:#8b969e}.stat-foot strong{color:var(--teal);font-weight:650}.dashboard-grid{grid-template-columns:minmax(0,1.65fr) minmax(280px,.9fr);align-items:start}.card{padding:17px 18px}.card-title{display:flex;justify-content:space-between;align-items:center;gap:10px}.card-title h3{font-size:14px;margin:0;font-weight:700}.card-title span{color:var(--muted);font-size:11px}.timeline{margin-top:12px}.timeline-row{display:grid;grid-template-columns:58px 18px minmax(0,1fr);gap:10px;min-height:85px}.time{font-size:11px;color:#7c8992;padding-top:13px}.rail{position:relative;display:flex;justify-content:center}.rail:before{content:"";position:absolute;top:20px;bottom:-2px;width:1px;background:#e1e8eb}.timeline-row:last-child .rail:before{display:none}.dot{position:relative;z-index:1;margin-top:15px;width:9px;height:9px;background:#8aacb1;border:2px solid #eef6f4;border-radius:50%}.lesson{border:1px solid var(--line);border-radius:12px;padding:12px 13px;margin-bottom:10px;display:flex;justify-content:space-between;gap:10px;align-items:center}.lesson.current{border-color:#c6d8e4;background:#f9fcfe}.lesson-name{font-weight:650;font-size:13px}.lesson-meta{font-size:11px;color:var(--muted);margin-top:4px}.lesson-topic{display:inline-block;margin-top:7px;padding:3px 7px;border-radius:6px;background:#eef3f6;color:#566a78;font-size:10px}.status{white-space:nowrap;padding:4px 8px;border-radius:999px;font-size:10px;font-weight:650;background:#edf4f0;color:#558275}.status.pending{background:var(--amber-2);color:var(--amber)}.status.done{background:#eef3f6;color:#71818d}.status.review{background:var(--red-2);color:var(--red)}
.queue{display:grid;gap:9px;margin-top:13px}.queue-item{display:flex;gap:11px;padding:12px;border-radius:12px;background:#fafbfc;border:1px solid #edf0f2}.queue-icon{width:29px;height:29px;flex:0 0 29px;border-radius:9px;display:grid;place-items:center;color:var(--blue);background:var(--blue-2);font-size:12px;font-weight:700}.queue-icon.green{color:var(--teal);background:var(--teal-2)}.queue-icon.gold{color:var(--amber);background:var(--amber-2)}.queue-text{min-width:0;flex:1}.queue-text strong{display:block;font-size:12px}.queue-text small{display:block;color:var(--muted);font-size:10px;margin:3px 0 8px}.flow-card{margin-top:15px;background:linear-gradient(125deg,#f4f8fa,#f8fbf8);border:1px solid #e2ebeb}.flow-steps{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-top:13px}.flow-step{font-size:10px;color:#63727c;border:1px solid #dfe7e9;background:#fff;padding:6px 8px;border-radius:8px}.flow-arrow{color:#9aa8ad;font-size:11px}.progress-head{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--muted);margin:13px 0 7px}.progress{height:7px;border-radius:99px;background:#e9eef0;overflow:hidden}.progress i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,#4c7e99,#56a18f)}
.two-col{grid-template-columns:minmax(0,1.2fr) minmax(260px,.8fr)}.three-col{grid-template-columns:repeat(3,minmax(0,1fr))}.student-list{display:grid;gap:9px}.student-row{display:flex;align-items:center;gap:12px;padding:13px;border:1px solid var(--line);border-radius:12px;background:#fff}.student-row .avatar{flex:0 0 36px}.student-row-main{min-width:0;flex:1}.student-row-main strong{display:block;font-size:12px}.student-row-main small{display:block;color:var(--muted);font-size:11px;margin-top:3px}.tag{display:inline-flex;align-items:center;gap:5px;background:#f1f4f6;color:#6c7b85;padding:4px 7px;border-radius:7px;font-size:10px}.tag.blue{background:var(--blue-2);color:var(--blue)}.tag.teal{background:var(--teal-2);color:var(--teal)}.tag.gold{background:var(--amber-2);color:var(--amber)}.student-detail{padding:20px}.detail-head{display:flex;align-items:center;gap:12px}.detail-head h3{margin:0;font-size:17px}.detail-head p{margin:4px 0 0;font-size:11px;color:var(--muted)}.detail-block{border-top:1px solid var(--line);padding-top:13px;margin-top:14px}.detail-block h4{font-size:11px;color:var(--muted);margin:0 0 8px}.weakness{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 0;font-size:12px}.weakness + .weakness{border-top:1px dashed #edf0f1}.weak-level{font-size:10px;color:var(--red);background:var(--red-2);padding:4px 7px;border-radius:7px}
.plan-list{display:grid;gap:10px;margin-top:12px}.plan-row{display:grid;grid-template-columns:90px minmax(0,1fr) 68px;gap:12px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:11px}.plan-date{font-size:11px;color:var(--muted)}.plan-topic{font-size:12px;font-weight:650}.plan-note{font-size:10px;color:var(--muted);margin-top:3px}.plan-state{font-size:10px;text-align:right;color:var(--teal)}
.schedule{display:grid;grid-template-columns:repeat(5,minmax(110px,1fr));gap:9px;overflow:auto;padding-bottom:4px}.day-col{min-width:110px;border:1px solid var(--line);border-radius:12px;background:#fbfcfd;padding:11px}.day-title{font-size:11px;color:var(--muted);margin-bottom:11px}.day-title strong{display:block;color:var(--ink);font-size:13px;margin-top:3px}.schedule-event{background:#edf4f6;border-left:3px solid #6c94a5;padding:9px 8px;border-radius:7px;margin-bottom:8px;font-size:10px}.schedule-event.green{background:#eef6f2;border-color:#68a38e}.schedule-event.gold{background:#fff6e7;border-color:#d2a04a}.schedule-event b{display:block;font-size:11px;margin-bottom:3px}.prep-columns{grid-template-columns:minmax(0,1.3fr) minmax(270px,.7fr)}.prep-step{display:grid;grid-template-columns:28px 1fr;gap:10px;padding:11px 0;border-bottom:1px solid #edf0f2}.prep-step:last-child{border:0}.step-num{width:24px;height:24px;border-radius:8px;background:var(--blue-2);color:var(--blue);display:grid;place-items:center;font-weight:700;font-size:11px}.prep-step strong{font-size:12px}.prep-step p{font-size:11px;color:var(--muted);margin:4px 0 0}.resource-list{display:grid;gap:9px;margin-top:10px}.resource{display:flex;justify-content:space-between;gap:10px;padding:10px;border-radius:10px;background:#fafbfc;border:1px solid #edf0f2;font-size:11px}.resource small{display:block;color:var(--muted);margin-top:3px}.question{border:1px solid var(--line);border-radius:12px;padding:13px;margin-bottom:9px}.question-head{display:flex;justify-content:space-between;gap:10px}.question h4{margin:0;font-size:12px}.question p{margin:7px 0;color:#65737d;font-size:11px}.question-foot{display:flex;gap:6px;flex-wrap:wrap}.filterbar{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.filterbar input,.filterbar select{border:1px solid var(--line);border-radius:9px;padding:8px 10px;background:#fff;color:#596975;font-size:11px}.message-card{border:1px solid var(--line);border-radius:12px;padding:14px;margin-bottom:10px;background:#fff}.message-top{display:flex;justify-content:space-between;align-items:center;gap:10px}.message-top strong{font-size:12px}.message-card p{font-size:12px;line-height:1.8;color:#566671;margin:10px 0}.message-actions{display:flex;gap:7px}.notice{padding:11px 13px;background:#f7f8fa;border:1px solid var(--line);border-radius:10px;color:#6b7984;font-size:11px;line-height:1.7}.empty-state{padding:38px;text-align:center;color:var(--muted)}
.modal-backdrop{display:none;position:fixed;inset:0;z-index:50;background:rgba(23,39,52,.36);align-items:center;justify-content:center;padding:16px}.modal-backdrop.open{display:flex}.modal{width:min(560px,100%);background:#fff;border-radius:18px;box-shadow:0 20px 60px rgba(20,35,48,.2);padding:22px}.modal-head{display:flex;justify-content:space-between;align-items:center}.modal-head h3{margin:0;font-size:16px}.close{width:30px;height:30px;border:0;background:#f1f3f5;border-radius:9px;color:#60707a}.modal-body{font-size:12px;line-height:1.8;color:#586874;margin:15px 0}.modal-actions{display:flex;justify-content:flex-end;gap:8px}.toast{position:fixed;z-index:60;bottom:22px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:#243a48;color:#fff;padding:11px 16px;border-radius:10px;font-size:12px;box-shadow:var(--shadow);transition:.22s}.toast.show{opacity:1;transform:translate(-50%,0)}.footer-note{margin:20px 0 0;color:#98a3ab;font-size:10px;text-align:center}
@media(max-width:1050px){.app{grid-template-columns:210px minmax(0,1fr)}.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.dashboard-grid,.prep-columns{grid-template-columns:1fr}}
@media(max-width:720px){.app{display:block}.sidebar{position:sticky;z-index:20;top:0;height:auto;padding:10px 12px;border-right:0;border-bottom:1px solid var(--line);gap:9px}.brand{padding:0 4px}.brand-mark{width:31px;height:31px}.nav-wrap{overflow:auto}.nav-label,.sidebar-bottom{display:none}.nav{display:flex;min-width:max-content;gap:3px}.nav button{padding:8px 10px;font-size:11px}.nav-glyph{display:none}.main{padding:18px 14px 34px}.topbar{align-items:flex-start}.topbar h1{font-size:20px}.top-actions{flex-wrap:wrap;justify-content:flex-end}.searchbox{display:none}.two-col,.three-col{grid-template-columns:1fr}.plan-row{grid-template-columns:68px minmax(0,1fr) 52px}.stats{gap:9px}.stat-card{padding:13px}.stat-value{font-size:23px}.section-head{align-items:flex-start}.lesson{align-items:flex-start}.schedule{grid-template-columns:repeat(5,130px)}}