:root{font-family:Inter,"Microsoft YaHei",system-ui,sans-serif;color:#24344a;background:#f4f7fb;font-synthesis:none;--blue:#2463eb;--muted:#78879b;--border:#e2e8f0}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button{cursor:pointer;border:0;border-radius:8px;padding:11px 18px;font-weight:600}button:disabled{opacity:.55;cursor:wait}button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #a9c7ff;outline-offset:2px}[hidden]{display:none!important}h1,h2,p{margin-top:0}h1{font-size:30px;letter-spacing:-1px}h2{font-size:25px;margin-bottom:10px}.muted,.hint{color:var(--muted);line-height:1.7}.hint{font-size:12px}.primary{background:var(--blue);color:white}.secondary{background:#edf3ff;color:var(--blue)}.full{width:100%;margin-top:10px}.text-button{background:transparent;color:var(--blue)}label{display:block;font-size:13px;font-weight:600;margin-bottom:18px}input:not([type=range]):not([type=file]),textarea{display:block;width:100%;padding:12px;border:1px solid var(--border);border-radius:8px;background:#fff;color:#24344a;margin-top:8px}input[readonly]{background:#f3f5f8!important;color:var(--muted)!important}textarea{min-height:100px;resize:vertical}.brand{font-size:23px;font-weight:800;display:flex;gap:12px;align-items:center}.brand span{font-size:18px;font-weight:600}.auth-layout{min-height:100vh;display:grid;grid-template-columns:43% 57%}.intro{padding:48px 12%;background:linear-gradient(155deg,#164caf,#2567dd 70%,#458afa);color:white;display:flex;flex-direction:column;justify-content:space-between;min-height:100vh}.intro h1{font-size:48px;line-height:1.5}.intro p{color:#dbe8ff;line-height:1.9}.eyebrow{font-size:11px;letter-spacing:2px;color:#6385af;font-weight:700;margin-bottom:12px}.intro-tags{display:flex;gap:12px;margin-top:30px}.intro-tags span{font-size:12px;padding:8px 13px;border:1px solid #ffffff40;border-radius:30px}.intro small{color:#bad2ff}.auth-content{display:flex;justify-content:center;align-items:center;padding:40px}.auth-card{width:100%;max-width:490px}.tabs{display:flex;gap:20px;border-bottom:1px solid var(--border);margin-bottom:32px}.tabs button{background:transparent;color:var(--muted);border-radius:0;padding:14px 0}.tabs .active{color:var(--blue);border-bottom:3px solid var(--blue)}.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 22px}.wide{grid-column:1/-1}.photo-field{display:flex;gap:20px;align-items:center;margin:8px 0 24px}.avatar-preview{width:88px;height:88px;background:#eef3fb;object-fit:cover;border-radius:12px;border:1px solid var(--border)}.photo-field label{margin-bottom:7px}.photo-field input{max-width:260px;font-size:12px}.photo-field .hint{margin:8px 0}.workspace{display:grid;grid-template-columns:240px 1fr;min-height:100vh}aside{background:#fff;padding:30px 20px;border-right:1px solid var(--border);display:flex;flex-direction:column}aside .brand{color:var(--blue);margin:0 5px 45px}.menu-label{color:#9aa6b6;margin:0 16px 12px;font-size:11px;letter-spacing:2px}nav button{display:block;width:100%;text-align:left;background:transparent;color:#65768b;margin-bottom:8px;padding:14px 18px}nav .active{color:var(--blue);background:#edf3ff}.sidebar-note{margin-top:auto;padding:22px 12px;color:#92a0b1;font-size:12px;line-height:1.7}.sidebar-note strong{color:#687c95}header{height:80px;background:#fff;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 38px;font-size:14px}header #identity{font-size:13px;color:#69798e;margin-right:15px}.main-area{min-width:0}.content{padding:36px;max-width:1400px;margin:auto}.page-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.page-heading h1{margin-bottom:8px}.page-heading p{margin-bottom:0}.panel{background:white;border:1px solid var(--border);border-radius:14px;padding:30px;box-shadow:0 4px 20px #263d6510}.panel form{max-width:800px}.narrow{max-width:600px}.badge{background:#e7f7f0;color:#26855f;padding:6px 12px;font-size:12px;border-radius:20px;white-space:nowrap}.badge.returned{color:#b46b16;background:#fff1db}.warning{background:#fff7e8;color:#965e20;border:1px solid #f3dcb4;padding:20px;border-radius:12px;margin-bottom:24px}.warning p{font-size:13px;margin:8px 0 0;white-space:pre-wrap}.search-label{max-width:380px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:13px}th{background:#f7f9fc;color:#7d8c9f;font-size:12px;white-space:nowrap}th,td{padding:15px 12px;border-bottom:1px solid #edf1f6}td{max-width:250px;overflow-wrap:anywhere}td img{height:48px;width:48px;border-radius:8px;object-fit:cover}td small{display:block;color:var(--muted);margin-top:6px}.empty{text-align:center;padding:40px;color:var(--muted)}dialog{border:0;border-radius:16px;padding:28px;width:min(94vw,460px);box-shadow:0 20px 100px #10274440;max-height:94vh;overflow:auto}dialog::backdrop{background:#16284288}dialog h2{font-size:22px}dialog .muted{font-size:13px}#cropCanvas{display:block;max-width:100%;height:auto;margin:0 auto 18px;border:2px solid var(--blue);touch-action:none;cursor:move}input[type=range]{display:block;width:100%;accent-color:var(--blue);margin-top:8px}.actions{display:flex;gap:12px;justify-content:flex-end}#toast{position:fixed;top:20px;left:50%;transform:translateX(-50%);z-index:20;background:#203d65;color:white;padding:14px 24px;border-radius:10px;max-width:92vw;box-shadow:0 10px 40px #1233;font-size:14px}
@media(max-width:900px){.intro{padding:35px 25px}.intro h1{font-size:36px}.workspace{grid-template-columns:190px 1fr}.content{padding:24px}.panel{padding:22px}.brand span{font-size:15px}.photo-field{flex-wrap:wrap}}
@media(max-width:650px){.auth-layout{display:block}.intro{min-height:0;padding:25px}.intro>div:nth-child(2),.intro>small{display:none}.auth-content{padding:26px 20px}.workspace{display:block}aside{padding:16px;border-right:0}aside .brand{margin:0 0 18px}.menu-label,.sidebar-note{display:none}nav{display:flex;gap:4px}nav button{padding:10px;font-size:12px;width:auto;margin:0}header{height:64px;padding:0 18px}header #identity{font-size:11px;margin:0}.content{padding:22px 14px}.field-grid{grid-template-columns:1fr}.page-heading h1{font-size:25px}.page-heading .muted{font-size:12px}.panel{padding:20px}.photo-field input{max-width:220px}}
.card-list{display:grid;gap:18px}.card-heading{display:flex;align-items:center;justify-content:space-between;gap:16px}.card-heading h2{font-size:20px;overflow-wrap:anywhere}.excerpt{color:#62738a;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere}.prose{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.9;padding:12px 0 24px}.large-text{min-height:160px}.large-dialog{width:min(94vw,960px)}.spaced{margin-top:24px}.call-panel{text-align:center;padding:40px}.call-panel .actions{justify-content:center}.picked-student{font-size:42px;color:var(--blue);font-weight:700;padding:32px 0 14px;overflow-wrap:anywhere}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.stat-card strong{display:block;font-size:36px;margin-top:12px;color:var(--blue)}.stat-card .muted{font-size:13px}.file-link{display:block;color:var(--blue);overflow-wrap:anywhere;padding:8px 0}.file-row{display:flex;gap:15px;align-items:center}.file-row label{margin:0;white-space:nowrap}.file-row input[type=checkbox]{display:inline;width:auto}.student-actions{min-width:180px}.student-actions button{font-size:12px;padding:7px 10px;margin:3px}.password-value{font-family:monospace;font-size:22px;padding:20px;background:#edf3ff;border-radius:8px;user-select:all}.warning{white-space:pre-wrap}.actions{flex-wrap:wrap}#gradingFiles{margin-bottom:20px}#submissionForm input[type=file]{display:block;margin-top:12px;max-width:100%}@media(max-width:900px){.stat-grid{grid-template-columns:1fr 1fr}}@media(max-width:650px){nav{flex-wrap:wrap}.page-heading{gap:12px}.page-heading>button{white-space:nowrap;font-size:12px;padding:10px}.call-panel{padding:25px 15px}.picked-student{font-size:30px}.stat-grid{gap:12px}.stat-card{padding:18px}.card-heading{align-items:flex-start}.card-heading h2{font-size:18px}.file-row{align-items:flex-start}.large-dialog{padding:20px}}
input[type=hidden]{display:none!important}
.photo-field{display:grid;grid-template-columns:minmax(0,1fr) 126px;gap:18px;align-items:center}.photo-controls{min-width:0}.photo-label{font-size:13px;font-weight:600;margin:0 0 12px}.photo-buttons{display:flex;gap:8px;flex-wrap:wrap}.photo-buttons button{font-size:13px;padding:10px 14px}.photo-preview{margin:0;text-align:center}.photo-preview-box{width:126px;height:126px;border:1px dashed #b8c9e4;border-radius:12px;background:#f3f7fd;display:grid;place-items:center;overflow:hidden}.photo-placeholder{font-size:12px;color:#91a2bc}.photo-preview-box .avatar-preview{width:100%;height:100%;border:0;border-radius:0;object-fit:cover}.photo-preview figcaption{font-size:11px;color:#7d8c9f;margin-top:7px}@media(max-width:420px){.photo-field{grid-template-columns:minmax(0,1fr) 104px;gap:12px}.photo-preview-box{width:104px;height:104px}.photo-buttons button{padding:9px 11px;font-size:12px}.photo-controls .hint{font-size:11px}}
/* Portrait and name move together in a fixed-height reel. */
.call-panel{overflow:hidden}.call-stage{position:relative;isolation:isolate;overflow:hidden;max-width:680px;margin:22px auto 26px;padding:24px 18px 22px;border:1px solid #dce8ff;border-radius:24px;background:radial-gradient(ellipse at 50% 35%,#fff 10%,#edf4ff 65%,#e4eeff);transition:border-color .4s,box-shadow .4s}.call-stage>.eyebrow{position:relative;z-index:1;color:#6c89b5;letter-spacing:3px;margin:0 0 10px}.call-orbit{position:absolute;z-index:-1;border:1px solid #b7cef34d;border-radius:50%;width:420px;height:420px;left:50%;top:50%;transform:translate(-50%,-50%);pointer-events:none}.orbit-two{width:550px;height:550px}.call-window{height:240px;overflow:hidden;position:relative;mask-image:linear-gradient(transparent,#000 10%,#000 90%,transparent)}.call-reel{will-change:transform}.call-card{height:240px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:12px;overflow:hidden}.call-avatar{position:relative;display:grid;place-items:center;flex-shrink:0;width:108px;height:108px;border:5px solid white;border-radius:28px;background:linear-gradient(135deg,#d9e8ff,#b7d2ff);color:#3266bc;box-shadow:0 12px 28px #215ec525;overflow:hidden;font-size:38px;font-weight:700}.call-avatar img{position:absolute;width:100%;height:100%;object-fit:cover}.call-placeholder{border-radius:50%;font-size:46px}.call-card strong{font-size:30px;line-height:1.25;color:#214477;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.call-card small{font-size:12px;color:#7b8fae}.call-result{min-height:47px;display:flex;flex-direction:column;gap:7px;margin-top:10px;font-size:14px;color:#577398}.call-result span:last-child{font-size:12px;color:#8395af}.is-picked{border-color:#94b9fa;box-shadow:0 0 0 4px #e9f1ff,0 16px 45px #2663bc16}.is-picked .call-avatar{border-color:#fff;box-shadow:0 0 0 3px #abcaff,0 12px 28px #215ec525}.is-picked .call-result span:first-child{color:#2463eb;font-weight:700}.is-rolling .call-result span:first-child{color:#2463eb}.call-panel .primary{min-width:168px;padding:14px 24px;box-shadow:0 6px 16px #2463eb25}.call-panel>.muted{font-size:13px;line-height:1.8}@media(max-width:650px){.call-stage{padding:20px 10px;border-radius:18px;margin:16px auto 22px}.call-card strong{font-size:27px}.call-panel .actions button{flex:1;padding:12px 10px;min-width:0}.call-panel .actions{gap:8px}}
select{display:block;width:100%;padding:12px;border:1px solid var(--border);border-radius:8px;background:white;color:#24344a;margin-top:8px;font:inherit}.requirement-summary{background:#edf4ff;border:1px solid #d8e6ff;border-radius:12px;padding:18px 20px;margin-bottom:20px;overflow-wrap:anywhere}.requirement-summary strong{display:block;margin-bottom:12px;color:#2454a0}.requirement-summary p{font-size:14px;margin:8px 0}.upload-slot{border:1px solid var(--border);border-radius:12px;padding:18px;margin:14px 0;background:#fafcff}.upload-slot label{margin:8px 0;overflow-wrap:anywhere}.upload-slot .hint{margin:8px 0 0}.download-box{padding:8px 0 18px}.download-link{display:inline-block;text-decoration:none;padding:12px 18px;border-radius:8px;font-weight:600}.download-box .hint{margin-top:12px}#requirementNames label{padding-left:12px;border-left:3px solid #d8e6ff}
.danger-secondary{background:#fff0ed;color:#b34232}.danger-secondary:hover{background:#ffe2dc}
/* Keep the complete system name readable on desktop and mobile. */
.brand{min-width:0;align-items:flex-start}.brand span{min-width:0;flex:1;line-height:1.65;overflow-wrap:anywhere}.intro .brand span{font-size:20px}aside .brand span{font-size:14px}@media(max-width:650px){.intro .brand span{font-size:18px}aside .brand span{font-size:16px}}
.call-with-score{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:20px;align-items:center}.call-with-score .call-stage{width:100%;min-width:0}.call-score-box{text-align:left;border:1px solid #dce8ff;background:#f8fbff;border-radius:18px;padding:22px 18px}.call-score-box h2{font-size:22px;overflow-wrap:anywhere}.score-choices{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}.score-choices button{padding:13px 8px}.score-sort{display:flex;gap:18px;flex-wrap:wrap}.score-sort label{min-width:190px}.score-sort select{max-width:320px}.call-score-box .eyebrow{letter-spacing:1px}#participationTable th button{padding:5px 0;font-size:12px;white-space:nowrap}@media(max-width:1000px){.call-with-score{grid-template-columns:1fr}.call-score-box{margin-bottom:22px}.score-choices{grid-template-columns:repeat(4,1fr)}.call-score-box h2{margin-bottom:8px}}@media(max-width:420px){.score-sort label{width:100%}.score-choices{gap:6px}.score-choices button{font-size:13px}}
.teacher-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}.teacher-card{text-align:center;overflow-wrap:anywhere}.teacher-identity{display:flex;align-items:center;gap:10px;margin:10px 0}.teacher-identity.large{flex-direction:column;font-size:21px}.teacher-portrait{position:relative;display:inline-grid;place-items:center;width:42px;height:42px;flex-shrink:0;border-radius:50%;background:#e8edff;color:#5366ba;font-size:20px;overflow:hidden}.teacher-portrait img{position:absolute;width:100%;height:100%;object-fit:cover}.large .teacher-portrait{width:100px;height:100px;font-size:36px;border:4px solid #edf0ff}.teacher-intro{white-space:pre-wrap;line-height:1.8}.my-score-total{display:block;font-size:38px;color:#5064c6;margin:16px 0}.classroom-alert{display:flex;align-items:center;gap:22px;border:1px solid #b9c7ff;background:linear-gradient(120deg,#f0f3ff,#fff);margin-bottom:24px}.classroom-alert h2{font-size:20px;margin:6px 0}.classroom-alert>div:nth-child(2){flex:1}.classroom-alert[hidden]{display:none}@media(max-width:650px){.classroom-alert{align-items:flex-start;flex-wrap:wrap;gap:10px}.classroom-alert>div:nth-child(2){flex-basis:65%}.teacher-grid{grid-template-columns:1fr}}

.student-detail-layout{display:grid;grid-template-columns:200px minmax(0,1fr);gap:28px;margin-top:20px}.student-detail-portrait{text-align:center}.student-photo-button{display:grid;place-items:center;width:100%;aspect-ratio:1;padding:0;overflow:hidden;border:1px solid #dce4f2;border-radius:14px;background:#f1f5fb;color:#718096;cursor:zoom-in}.student-photo-button img{display:block;width:100%;height:100%;object-fit:contain}.student-photo-button:disabled{cursor:default;opacity:1}.student-detail-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin:0}.student-detail-fields dt{font-size:12px;color:#748096;margin-bottom:7px}.student-detail-fields dd{margin:0;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.6}.student-detail-fields .wide{grid-column:1/-1}.student-photo-dialog{width:min(760px,94vw)}.student-photo-dialog>img{display:block;width:100%;max-height:70vh;object-fit:contain;border-radius:12px;background:#f4f6fa}@media(max-width:650px){.student-detail-layout{grid-template-columns:1fr}.student-detail-portrait{width:180px;margin:auto}.student-detail-fields{gap:18px 12px}.student-detail-fields dd{font-size:14px}}

.score-celebration{width:min(880px,94vw);padding:42px 30px;border:1px solid #ffe2a2;border-radius:30px;background:radial-gradient(ellipse at 50% 25%,#fffdf3,#fff0cf 60%,#e9eeff);overflow:hidden;text-align:center;box-shadow:0 24px 100px #141c5660}.score-celebration::backdrop{background:#111d40b8;backdrop-filter:blur(5px)}.celebration-content{position:relative;z-index:1}.celebration-close{position:absolute;right:15px;top:10px;z-index:2;background:transparent;font-size:30px;color:#7a684b}.celebration-eyebrow{color:#9a7728;font-size:14px;letter-spacing:2px;margin-bottom:24px}.celebration-avatar{position:relative;display:grid;place-items:center;width:150px;height:150px;margin:0 auto 18px;border:6px solid white;border-radius:50%;background:#dae3ff;color:#5064b8;font-size:60px;box-shadow:0 0 0 10px #ffcc5538,0 12px 36px #b8872430;overflow:hidden}.celebration-avatar img{position:absolute;width:100%;height:100%;object-fit:cover}.score-celebration h2{font-size:clamp(28px,4vw,46px);margin:10px 0;overflow-wrap:anywhere}.celebration-points{font-size:clamp(60px,10vw,110px);font-weight:900;line-height:1.2;color:#bd7713;text-shadow:0 3px 0 white;margin:8px 0 16px}.score-celebration[open] .celebration-points{animation:score-pop .65s cubic-bezier(.18,.8,.3,1.35) both}#celebrationTeacher{display:flex;align-items:center;justify-content:center;gap:12px;color:#786843}#celebrationCaption{color:#8c784f;font-size:18px;margin:12px 0 22px}.celebration-continue{background:#243b73;color:white;padding:12px 30px}.celebration-confetti{position:absolute;inset:0;pointer-events:none;overflow:hidden}.celebration-confetti i{position:absolute;left:var(--x);top:-25px;width:10px;height:17px;border-radius:2px;animation:score-confetti 3s var(--delay) ease-in forwards}.no-points{background:linear-gradient(145deg,#f8faff,#e7edfc);border-color:#d6dff4}.no-points .celebration-points{font-size:clamp(32px,6vw,58px);color:#607398}.no-points .celebration-avatar{box-shadow:0 0 0 8px #dce5f7}.no-points[open] .celebration-points{animation:none}@keyframes score-pop{from{opacity:0;transform:scale(.35) translateY(20px)}to{opacity:1;transform:scale(1) translateY(0)}}@keyframes score-confetti{to{transform:translate(var(--drift),800px) rotate(640deg);opacity:0}}@media(max-width:650px){.score-celebration{padding:34px 18px 24px}.celebration-avatar{width:110px;height:110px}.celebration-eyebrow{font-size:11px;letter-spacing:0}#celebrationCaption{font-size:15px}}@media(prefers-reduced-motion:reduce){.score-celebration[open] .celebration-points,.celebration-confetti i{animation:none}.celebration-confetti{display:none}}

.attachment-actions{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin:12px 0}.attachment-actions>span{overflow-wrap:anywhere;min-width:0}.attachment-actions .file-link{margin:0}.attachment-preview-dialog{width:min(1100px,96vw)}.attachment-preview-dialog h2{overflow-wrap:anywhere;min-width:0}.attachment-preview-dialog .card-heading{align-items:flex-start;gap:15px}.attachment-preview-dialog .card-heading button{flex-shrink:0}.attachment-preview-body{max-height:65vh;overflow:auto;background:#f5f7fa;border:1px solid #dde4ef;border-radius:12px;padding:16px}.attachment-preview-text{font-family:Consolas,"Microsoft YaHei",monospace;font-size:14px;line-height:1.75;white-space:pre-wrap;overflow-wrap:anywhere;margin:0;tab-size:4}.attachment-preview-image{display:block;height:auto;max-width:none;margin:auto}#attachmentPreviewZoom{max-width:300px}