:root{color:#0f172a;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#eff3f8;font-family:Plus Jakarta Sans,IBM Plex Sans,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-weight:400;line-height:1.5}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0}body{background:#eff3f8;min-width:320px}button,input,textarea,select{font:inherit}:root{--bg:#f4f7fb;--surface:#fff;--surface-soft:#f8fbff;--line:#d9e2ef;--line-strong:#bfd0e5;--text:#111827;--text-soft:#4b5563;--text-muted:#6b7280;--nuaa-blue:#005bac;--nuaa-blue-dark:#004080;--nuaa-blue-deep:#002b5c;--nuaa-blue-soft:#eaf3ff;--success:#159447;--success-soft:#eaf8ef;--warning:#d97706;--warning-soft:#fff7e6;--danger:#dc2626;--danger-soft:#fff1f1;--info:#2563eb;--info-soft:#edf4ff;--shadow:0 12px 28px #0f234114;--shadow-soft:0 4px 14px #0f23410f;--radius:8px;--radius-lg:10px}.login-shell,.page-shell{background:linear-gradient(180deg, #ffffffd1, #f4f7fbf0), var(--bg);min-height:100vh;color:var(--text)}.login-shell{grid-template-rows:auto 1fr;display:grid}.login-header{border-bottom:1px solid var(--line);background:#fff}.login-header-inner{justify-content:space-between;align-items:center;gap:24px;width:min(1180px,100% - 48px);margin:0 auto;padding:18px 0;display:flex}.login-header-brand,.login-header-copy,.sidebar-brand,.api-field,.service-pill,.inline-row,.thread-meta{align-items:center;display:flex}.login-header-brand,.sidebar-brand{gap:14px}.login-mark,.brand-crest{background:var(--nuaa-blue);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:48px;height:48px;font-weight:800;display:inline-flex;box-shadow:inset 0 0 0 3px #ffffff24}.login-header-copy{flex-direction:column;align-items:flex-start;gap:2px}.login-kicker,.eyebrow,.summary-caption,.state-eyebrow{color:var(--nuaa-blue);letter-spacing:0;margin:0;font-size:.74rem;font-weight:800}.login-header-copy h1,.workspace-title-block h2,.login-panel-head h2,.section-head h3,.brand-intro h1,.sidebar-brand h1{color:var(--text);letter-spacing:0;margin:0;line-height:1.18}.login-header-copy h1{font-size:1.45rem}.login-header-meta,.login-panel-head p,.login-aside-head p,.login-guide-list,.brand-copy,.workspace-subcopy,.muted-paragraph,.section-head p,.state-panel p,.thread-card small,.sidebar-brand p,.nav-item small,.sidebar-footer p,.sidebar-guide p{color:var(--text-muted);margin:0;line-height:1.65}.login-stage{flex-direction:column;gap:16px;width:min(1180px,100% - 48px);margin:0 auto;padding:28px 0 44px;display:flex}.login-card,.login-panel,.section-card,.state-panel,.entity-card,.thread-card,.summary-card,.hero-banner,.hero-metric,.login-support span,.rail-card,.seeded-box{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-soft)}.login-card{padding:0;overflow:hidden}.login-layout{grid-template-columns:360px minmax(0,1fr);min-height:640px;display:grid}.login-aside{background:linear-gradient(155deg, #005bacf5, #002b5cfa), var(--nuaa-blue-deep);color:#fff;flex-direction:column;gap:28px;padding:36px 32px;display:flex}.login-aside-head{gap:12px;display:grid}.login-aside-label{color:#dbeafe;border:1px solid #ffffff47;border-radius:999px;width:fit-content;padding:5px 10px;font-size:.76rem;font-weight:800}.login-aside-head strong{color:#fff;font-size:1.45rem}.login-aside-head p,.login-guide-list{color:#ffffffc7}.login-support,.rail-grid{gap:12px;display:grid}.login-support span{color:#ffffffdb;box-shadow:none;background:#ffffff14;border-color:#ffffff2e;padding:12px}.login-guide-list{padding-left:18px}.login-form-column{flex-direction:column;gap:16px;padding:30px 34px;display:flex}.login-panel{box-shadow:none;padding:26px}.login-panel-head{border-bottom:1px solid var(--line);justify-content:space-between;gap:16px;padding-bottom:16px}.login-panel-head h2{font-size:1.55rem}.mode-switch{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-soft);grid-template-columns:1fr 1fr;padding:4px;display:grid}.mode-button{min-height:40px;color:var(--text-soft);cursor:pointer;background:0 0;border:0;border-radius:6px;font-weight:800}.mode-button.active{color:#fff;background:var(--nuaa-blue)}.notification-stack{z-index:1000;pointer-events:none;flex-direction:column;gap:10px;width:min(360px,100vw - 32px);display:flex;position:fixed;top:16px;right:16px}.login-notification-stack{pointer-events:auto;width:auto;margin-bottom:4px;position:static}.notification-item{pointer-events:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-soft);color:var(--text);align-items:center;gap:10px;padding:12px 14px;font-weight:600;animation:.18s ease-out notification-enter;display:flex}.notification-info{background:var(--info-soft);color:var(--nuaa-blue-dark);border-color:#b7dcff}.notification-success{background:var(--success-soft);color:#0f6b34;border-color:#b6e2c8}.notification-error{background:var(--danger-soft);color:#a01515;border-color:#f3b3b3}.notification-type{letter-spacing:.5px;background:#ffffff8c;border-radius:999px;flex:none;padding:2px 8px;font-size:.78rem;font-weight:700}.notification-content{flex:auto;font-weight:600;line-height:1.4}.notification-dismiss{width:24px;height:24px;color:inherit;cursor:pointer;background:0 0;border:none;border-radius:999px;flex:none;justify-content:center;align-items:center;font-size:1.1rem;line-height:1;display:inline-flex}.notification-dismiss:hover,.notification-dismiss:focus-visible{background:#00000014;outline:none}@keyframes notification-enter{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}@media (width<=600px){.notification-stack{width:auto;top:8px;left:8px;right:8px}}.stack-form{gap:14px;display:grid}.auth-flow{gap:16px;display:grid}.auth-entry-row{border-top:1px solid var(--line);color:var(--text-muted);flex-wrap:wrap;justify-content:center;align-items:center;gap:10px;padding-top:6px;font-size:.92rem;display:flex}.link-button{color:var(--nuaa-blue);cursor:pointer;background:0 0;border:0;padding:0;font-weight:850}.link-button:hover{color:var(--nuaa-blue-dark);text-decoration:underline}.form-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;display:grid}label{color:var(--text);gap:7px;font-size:.92rem;font-weight:760;display:grid}input,textarea,select{border:1px solid var(--line-strong);width:100%;min-height:42px;color:var(--text);background:#fff;border-radius:6px;outline:none;padding:10px 12px;transition:border-color .16s,box-shadow .16s,background .16s}textarea{resize:vertical;min-height:116px}input:focus,textarea:focus,select:focus{border-color:var(--nuaa-blue);box-shadow:0 0 0 3px #005bac1f}.inline-row{flex-wrap:wrap;gap:10px}.table-wrapper{border:1px solid var(--line);background:#fff;border-radius:8px;overflow-x:auto}.data-table{border-collapse:collapse;width:100%;color:var(--text);font-size:.9rem}.data-table th,.data-table td{border-bottom:1px solid var(--line);text-align:left;white-space:nowrap;padding:10px 12px}.data-table thead th{background:var(--surface-2,#f6f8fb);color:var(--text-muted);font-size:.82rem;font-weight:800}.data-table tbody tr:last-child td{border-bottom:0}.data-table tbody tr:hover{background:#005bac0a}.password-field{display:block;position:relative}.password-field input{width:100%;padding-right:60px}.password-toggle{color:var(--nuaa-blue);cursor:pointer;background:0 0;border:0;border-radius:4px;padding:4px 10px;font-size:.82rem;font-weight:700;position:absolute;top:50%;right:8px;transform:translateY(-50%)}.password-toggle:hover{background:#005bac14}.grow{flex:1}button{border:0}.primary-button,.ghost-button,.danger-button{cursor:pointer;border-radius:6px;min-height:42px;padding:0 18px;font-weight:850;transition:transform .16s,box-shadow .16s,border-color .16s,background .16s}.primary-button{color:#fff;background:var(--nuaa-blue);box-shadow:0 8px 18px #005bac2e}.ghost-button{color:var(--nuaa-blue-dark);background:#fff;border:1px solid #005bac6b}.danger-button{color:var(--danger);background:#fff;border:1px solid #dc262659}.primary-button:hover,.ghost-button:hover,.danger-button:hover,.nav-item:hover,.entity-card:hover{transform:translateY(-1px)}.primary-button:disabled,.ghost-button:disabled,.danger-button:disabled{cursor:not-allowed;opacity:.55;box-shadow:none;transform:none}a.primary-button,a.ghost-button,a.danger-button{justify-content:center;align-items:center;text-decoration:none;display:inline-flex}.login-footer{color:var(--text-muted);margin:0;font-size:.88rem}.combobox{gap:6px;display:grid;position:relative}.combobox-options{z-index:30;border:1px solid var(--line-strong);background:#fff;border-radius:6px;max-height:220px;margin:4px 0 0;padding:4px 0;list-style:none;position:absolute;top:100%;left:0;right:0;overflow-y:auto;box-shadow:0 12px 24px #0f172a1f}.combobox-options li{margin:0}.combobox-options button{text-align:left;width:100%;color:var(--text);cursor:pointer;background:0 0;padding:8px 12px;font-size:.92rem}.combobox-options button:hover,.combobox-options button.is-active{color:var(--nuaa-blue-dark);background:#005bac14}.combobox-empty{color:var(--text-muted);padding:8px 12px;font-size:.9rem}.combobox-hint{font-size:.82rem;font-weight:600}.combobox-hint--idle{color:var(--text-muted)}.combobox-hint--ok{color:#15803d}.combobox-hint--error{color:var(--danger)}.page-shell{grid-template-columns:232px minmax(0,1fr);display:grid}.brand-rail{background:linear-gradient(180deg, var(--nuaa-blue-deep), #003b78 55%, #002653), var(--nuaa-blue-deep);color:#fff;align-self:start;min-height:100vh;padding:22px 12px;position:sticky;top:0}.app-sidebar{flex-direction:column;gap:18px;display:flex}.sidebar-brand{padding:8px 8px 14px}.sidebar-brand h1{color:#fff;font-size:1.1rem}.sidebar-brand p{color:#ffffffb8;font-weight:700}.sidebar-nav{gap:8px;display:grid}.nav-item{border-radius:var(--radius);color:#ffffffdb;text-align:left;cursor:pointer;background:0 0;grid-template-columns:34px minmax(0,1fr);align-items:center;gap:10px;width:100%;padding:11px 10px;display:grid}.nav-item strong{color:inherit;font-size:.98rem;display:block}.nav-item small{color:#fff9;font-size:.72rem;line-height:1.35;display:block}.nav-icon{background:#ffffff1a;border-radius:8px;justify-content:center;align-items:center;width:34px;height:34px;font-weight:900;display:inline-flex}.nav-item.active{color:#fff;background:#0b72c9;box-shadow:0 12px 24px #0014303d}.nav-item.active .nav-icon{background:#ffffff2e}.sidebar-footer,.sidebar-guide{border-radius:var(--radius);background:#ffffff14;border:1px solid #ffffff29;margin-top:auto;padding:12px}.sidebar-guide{margin-top:0}.sidebar-footer{align-items:center;gap:8px;display:flex}.sidebar-footer p,.sidebar-guide p{color:#ffffffb8;font-size:.82rem}.sidebar-guide strong{color:#fff;margin-bottom:5px;display:block}.workspace{min-width:0;padding:0 22px 36px}.workspace-head{border-bottom:1px solid var(--line);z-index:10;background:#ffffffeb;justify-content:space-between;align-items:center;gap:18px;min-height:66px;margin:0 -22px 22px;padding:0 22px;display:flex;position:sticky;top:0}.workspace-title-block{gap:4px;min-width:0;display:grid}.workspace-title-block h2{font-size:1.45rem}.api-field{color:var(--text-soft);gap:10px;margin-left:auto}.api-field strong{color:var(--nuaa-blue-dark);background:#eff8ff;border:1px solid #80c7ff;border-radius:999px;padding:3px 10px}.service-pill{color:var(--text);gap:6px;font-weight:750}.service-dot{background:var(--success);border-radius:999px;width:9px;height:9px;display:inline-flex}.context-bar{border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-soft);background:#fff;grid-template-columns:minmax(180px,1.2fr) repeat(3,minmax(180px,1fr));align-items:end;gap:12px;padding:14px;display:grid}.context-kicker{color:var(--nuaa-blue);margin:0 0 4px;font-size:.75rem;font-weight:800}.context-bar h3{margin:0;font-size:1rem}.context-bar label{color:var(--text-soft);gap:6px;font-size:.8rem;font-weight:760;display:grid}.context-bar select{min-width:0}.hero-banner{background:linear-gradient(#fff,#f7fbff);border-color:#b7d8f5;justify-content:space-between;align-items:center;gap:18px;padding:18px 20px;display:flex}.hero-banner h3{color:var(--text);margin:4px 0 6px;font-size:1.32rem}.hero-banner h3 span{color:var(--nuaa-blue)}.hero-banner p{color:var(--text-muted);margin:0}.identity-chip,.status-tag,.thread-tag,.thread-meta span,.thread-meta strong{border-radius:999px;align-items:center;gap:6px;width:fit-content;padding:5px 10px;font-size:.78rem;font-weight:850;display:inline-flex}.identity-chip{background:#fff;border:1px solid #b7d8f5;flex-direction:column;align-items:flex-start}.identity-chip span,.thread-tag,.thread-meta span{color:var(--nuaa-blue-dark);background:var(--nuaa-blue-soft)}.identity-chip strong{color:var(--text);font-size:.95rem}.hero-metrics,.summary-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;display:grid}.hero-metric,.summary-card{gap:8px;min-height:108px;padding:17px;display:grid;position:relative;overflow:hidden}.hero-metric span,.summary-label{color:var(--text-soft);margin:0;font-weight:760}.hero-metric strong,.summary-value{color:var(--nuaa-blue);font-size:2rem;line-height:1}.summary-accent{border-radius:99px;width:36px;height:5px}.section-card{gap:15px;min-width:0;padding:18px;display:grid}.section-card.wide-card{grid-column:1/-1}.section-head{border-bottom:1px solid var(--line);gap:5px;padding-bottom:12px;display:grid}.section-head h3{font-size:1.1rem}.search-input{flex:1}.entity-list,.thread-stack{gap:10px;max-height:520px;padding-right:2px;display:grid;overflow:auto}.entity-list.compact{max-height:360px}.entity-card{text-align:left;cursor:pointer;gap:8px;width:100%;padding:14px;display:grid}.entity-card.active{border-color:var(--nuaa-blue);box-shadow:0 0 0 1px #005bac24, var(--shadow-soft);background:#f4faff}.entity-card div{justify-content:space-between;align-items:center;gap:12px;display:flex}.entity-card strong{color:var(--text)}.entity-card span{color:var(--nuaa-blue-dark);background:var(--nuaa-blue-soft)}.status-tag{color:var(--success);background:var(--success-soft)}.status-tag.status-disabled{color:var(--danger);background:var(--danger-soft)}.status-tag.status-cancelled{color:var(--text-muted);background:#0f172a14}.feedback-card-tags{flex-wrap:wrap;gap:6px;display:inline-flex;background:0 0!important;border-radius:0!important;padding:0!important}.feedback-card-tag{border-radius:999px;align-items:center;padding:2px 8px;font-size:12px;font-weight:500;line-height:1.6;display:inline-flex}.feedback-card-tag--kind{color:var(--nuaa-blue-dark);background:var(--nuaa-blue-soft)}.feedback-card-tag--answered{color:var(--success);background:var(--success-soft)}.feedback-card-tag--pending{color:var(--warning);background:var(--warning-soft)}.feedback-thread-card--pending{border-left:3px solid var(--warning)}.feedback-thread-card--answered{border-left:3px solid var(--success)}.user-admin{gap:16px;display:grid}.user-admin-list{gap:12px;display:grid}.user-admin-card{cursor:default}.user-admin-card.status-disabled{background:#dc26260a;border-color:#dc262629}.user-admin-card.status-cancelled{opacity:.7}.user-admin-meta{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.entity-card p,.entity-card small{color:var(--text-muted);margin:0;line-height:1.55}.course-assignment-detail-body{gap:14px;display:grid}.cta-row{flex-wrap:wrap;justify-content:flex-end;gap:10px;display:flex}.student-assignment-workspace{gap:14px;display:grid}.assignment-detail{gap:8px;display:grid}.assignment-detail h4{margin:0;font-size:1rem}.assignment-detail p{color:var(--text-muted);margin:0;line-height:1.6}.detail-list{gap:8px;margin:0;display:grid}.detail-list div,.submission-summary{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-soft);padding:10px}.detail-list dt{color:var(--text-soft);font-size:.75rem;font-weight:800}.detail-list dd{margin:2px 0 0}.submission-summary{gap:6px;display:grid}.submission-summary span{width:fit-content;color:var(--nuaa-blue-dark);font-weight:800}.submission-summary strong{color:var(--nuaa-blue);font-size:1.3rem}.teacher-task-workspace{gap:16px;display:grid}.task-intro,.task-panel{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface)}.task-intro{grid-template-columns:minmax(0,1fr) minmax(280px,.75fr);align-items:start;gap:16px;padding:16px;display:grid}.task-intro h4,.task-panel h4{color:var(--text);margin:0}.task-intro p,.task-panel-head p{color:var(--text-muted);margin:6px 0 0;line-height:1.55}.task-summary-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;display:grid}.task-summary-grid div{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-soft);padding:12px}.task-summary-grid span,.task-panel-head span{color:var(--text-soft);font-size:.78rem;font-weight:800}.task-summary-grid strong{color:var(--nuaa-blue);margin-top:6px;font-size:1.5rem;display:block}.task-panel{gap:14px;padding:16px;display:grid}.task-panel-head{justify-content:space-between;align-items:flex-start;gap:14px;display:flex}.task-panel-head>span{border-radius:var(--radius);color:var(--nuaa-blue-dark);background:#edf6ff;padding:6px 10px}.state-panel{background:var(--surface-soft);box-shadow:none;gap:6px;padding:16px;display:grid}.state-panel strong{color:var(--text)}.thread-card{box-shadow:none;gap:12px;padding:15px;display:grid}.thread-card p{color:var(--text-soft);margin:0;line-height:1.65}.thread-meta{justify-content:space-between}.thread-meta strong{color:var(--success);background:var(--success-soft)}.thread-response{border:1px solid var(--line);border-radius:var(--radius);background:#f8fbff;gap:8px;padding:12px;display:grid}.thread-response span{color:var(--nuaa-blue);font-size:.82rem;font-weight:850}.inline-form{grid-template-columns:minmax(0,1fr) auto;gap:10px;display:grid}.bullet-list{color:var(--text-soft);gap:10px;margin:0;padding-left:18px;display:grid}.danger-button+.muted-paragraph,.danger-zone{color:var(--danger)}.muted-paragraph strong{color:var(--text)}.current-progress-card{grid-column:1/-1}.current-progress-card .bullet-list{grid-template-columns:repeat(3,minmax(0,1fr));padding-left:0;list-style:none}.current-progress-card .bullet-list li{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-soft);padding:10px 12px}.muted-text{color:var(--text-muted);font-size:.92rem;font-weight:600}.course-workspace{gap:16px;display:grid}.course-workspace-head{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow-soft);gap:16px;padding:20px 22px;display:grid}.course-workspace-title{gap:4px;display:grid}.course-workspace-title h3{color:var(--text);flex-wrap:wrap;align-items:baseline;gap:10px;margin:0;font-size:1.35rem;display:flex}.course-context-grid{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin:0;display:grid}.course-context-grid>div{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-soft);gap:4px;min-width:0;padding:10px 12px;display:grid}.course-context-grid dt{color:var(--text-muted);letter-spacing:.02em;margin:0;font-size:.75rem;font-weight:800}.course-context-grid dd{color:var(--text);word-break:break-word;margin:0;font-size:.96rem;font-weight:700}.course-workspace-tabs{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow-soft);flex-wrap:wrap;gap:6px;padding:6px;display:flex}.tab-link{color:var(--text-soft);border-radius:6px;padding:8px 16px;font-size:.92rem;font-weight:760;text-decoration:none;transition:background .16s,color .16s,box-shadow .16s}.tab-link:hover{color:var(--nuaa-blue-dark);background:var(--nuaa-blue-soft)}.tab-link.active{color:#fff;background:var(--nuaa-blue);box-shadow:0 4px 12px #005bac2e}.course-workspace-body{gap:16px;display:grid}@media (width<=1180px){.page-shell{grid-template-columns:210px minmax(0,1fr)}.hero-metrics,.summary-grid,.context-bar{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=840px){.login-layout,.form-grid,.hero-metrics,.summary-grid,.context-bar,.task-intro,.task-summary-grid{grid-template-columns:1fr}.page-shell-compact{grid-template-columns:minmax(0,1fr)}.workspace{padding:0 14px 28px}.workspace-head{flex-wrap:wrap;margin:0 -14px 16px;padding:12px 14px;position:relative}.api-field{flex-wrap:wrap;margin-left:0}.hero-banner{flex-direction:column;align-items:flex-start}.inline-form{grid-template-columns:1fr}input,textarea,select{min-height:46px;font-size:16px}textarea{min-height:132px}}.hamburger-button{border:1px solid var(--line-strong);cursor:pointer;background:#fff;border-radius:8px;justify-content:center;align-items:center;width:40px;height:40px;margin-right:4px;padding:0;display:inline-flex}.hamburger-button:focus-visible{border-color:var(--nuaa-blue);outline:none;box-shadow:0 0 0 3px #005bac2e}.hamburger-bars{flex-direction:column;gap:4px;width:18px;display:inline-flex}.hamburger-bars span{background:var(--text);border-radius:2px;height:2px;display:block}.sidebar-drawer{z-index:40;display:flex;position:fixed;inset:0}.sidebar-drawer-overlay{cursor:pointer;background:#08122373;border:0;width:100%;height:100%;margin:0;padding:0;position:absolute;inset:0}.sidebar-drawer-panel.brand-rail{z-index:1;width:min(82vw,320px);min-height:100vh;padding:22px 16px;animation:.18s ease-out sidebar-drawer-slide-in;position:relative;overflow-y:auto;box-shadow:12px 0 32px #00143052}@keyframes sidebar-drawer-slide-in{0%{transform:translate(-100%)}to{transform:translate(0)}}