html,body{width:100%;height:100%}input::-ms-clear,input::-ms-reveal{display:none}*,*:before,*:after{box-sizing:border-box}html{font-family:sans-serif;line-height:1.15;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%;-ms-overflow-style:scrollbar;-webkit-tap-highlight-color:rgba(0,0,0,0)}@-ms-viewport{width:device-width}body{margin:0}[tabindex="-1"]:focus{outline:none}hr{box-sizing:content-box;height:0;overflow:visible}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5em;font-weight:500}p{margin-top:0;margin-bottom:1em}abbr[title],abbr[data-original-title]{-webkit-text-decoration:underline dotted;text-decoration:underline dotted;border-bottom:0;cursor:help}address{margin-bottom:1em;font-style:normal;line-height:inherit}input[type=text],input[type=password],input[type=number],textarea{-webkit-appearance:none}ol,ul,dl{margin-top:0;margin-bottom:1em}ol ol,ul ul,ol ul,ul ol{margin-bottom:0}dt{font-weight:500}dd{margin-bottom:.5em;margin-left:0}blockquote{margin:0 0 1em}dfn{font-style:italic}b,strong{font-weight:bolder}small{font-size:80%}sub,sup{position:relative;font-size:75%;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}pre,code,kbd,samp{font-size:1em;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,Courier,monospace}pre{margin-top:0;margin-bottom:1em;overflow:auto}figure{margin:0 0 1em}img{vertical-align:middle;border-style:none}a,area,button,[role=button],input:not([type=range]),label,select,summary,textarea{touch-action:manipulation}table{border-collapse:collapse}caption{padding-top:.75em;padding-bottom:.3em;text-align:left;caption-side:bottom}input,button,select,optgroup,textarea{margin:0;color:inherit;font-size:inherit;font-family:inherit;line-height:inherit}button,input{overflow:visible}button,select{text-transform:none}button,html [type=button],[type=reset],[type=submit]{-webkit-appearance:button}button::-moz-focus-inner,[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner{padding:0;border-style:none}input[type=radio],input[type=checkbox]{box-sizing:border-box;padding:0}input[type=date],input[type=time],input[type=datetime-local],input[type=month]{-webkit-appearance:listbox}textarea{overflow:auto;resize:vertical}fieldset{min-width:0;margin:0;padding:0;border:0}legend{display:block;width:100%;max-width:100%;margin-bottom:.5em;padding:0;color:inherit;font-size:1.5em;line-height:inherit;white-space:normal}progress{vertical-align:baseline}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:none}[type=search]::-webkit-search-cancel-button,[type=search]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}summary{display:list-item}template{display:none}[hidden]{display:none!important}mark{padding:.2em;background-color:#feffe6}:root{font-family:Plus Jakarta Sans,PingFang SC,Microsoft YaHei,sans-serif;--color-primary: #2563eb;--color-success: #16a34a;--color-warning: #d97706;--color-danger: #dc2626;--color-bg: #f4f7fb;--color-surface: #ffffff;--color-surface-muted: #eef4ff;--color-text-primary: #0f172a;--color-text-secondary: #475569;--color-border: #d9e2f0;--color-code-bg: #0f172a;--color-code-text: #e2e8f0;--shadow-card: 0 16px 32px rgba(15, 23, 42, .1);color:var(--color-text-primary);background:var(--color-bg);color-scheme:light}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%}body{background:var(--color-bg);color:var(--color-text-primary)}a{color:inherit;text-decoration:none}.app-shell{height:100vh;background:var(--color-bg);overflow:hidden}.app-main-layout,.app-shell .ant-layout{background:transparent!important}.app-main-layout{min-width:0;min-height:0}.app-sider.ant-layout-sider{background:transparent!important;flex:0 0 240px!important;max-width:240px!important;min-width:240px!important;width:240px!important;height:100vh}.app-sider .ant-layout-sider-children{display:flex;flex-direction:column;gap:24px;height:100%;padding:24px 16px 24px 24px;background:var(--color-code-bg);overflow:hidden}.app-sider__section{display:flex;flex-direction:column;gap:20px;flex:1;min-height:0;overflow-y:auto;padding-right:8px;scrollbar-gutter:stable}.app-brand{display:flex;flex-direction:column;gap:4px;width:100%;min-width:0}.app-brand__title.ant-typography{margin:0!important;display:block;width:100%;overflow:hidden;white-space:nowrap;color:#fff!important;font-size:clamp(19px,calc(.8rem + .5vw),21px)!important;font-weight:700!important;line-height:1.2;letter-spacing:-.03em}.app-brand__subtitle{color:#cbd5e1!important;font-size:14px}.app-nav-menu.ant-menu{background:transparent!important;border-inline-end:none!important}.app-nav-menu.ant-menu .ant-menu-item{height:44px;margin:0 0 8px!important;border-radius:12px;color:#cbd5e1!important;display:flex;align-items:center;font-size:15px;font-weight:500}.app-nav-menu.ant-menu .ant-menu-item .ant-menu-item-icon{color:inherit!important;font-size:16px}.app-nav-menu.ant-menu .ant-menu-item-selected{background:#1e293b!important;color:#fff!important}.app-nav-menu.ant-menu .ant-menu-item-selected:after{display:none}.app-sider__footer{display:flex;flex-direction:column;gap:8px;flex-shrink:0;padding-top:12px;border-top:1px solid rgba(148,163,184,.2)}.app-sider__footer-label,.app-mobile-drawer__label{color:#94a3b8!important;font-size:12px;font-weight:600}.app-topbar.ant-layout-header{height:72px;line-height:normal;display:flex;justify-content:space-between;align-items:center;margin:28px 28px 0;padding:0 24px!important;background:var(--color-surface)!important;border:1px solid #e2e8f0;border-radius:16px}.app-topbar__left{display:flex;align-items:center;gap:12px}.app-topbar__note{color:var(--color-text-secondary)!important;font-size:15px}.language-switcher{display:inline-flex;align-items:center;justify-content:space-between;gap:8px}.language-switcher.ant-btn{box-shadow:none}.language-switcher--sidebar.ant-btn{width:100%;height:44px;color:#fff;background:#1e293b!important;border-color:#1e293b!important;justify-content:space-between}.language-switcher--sidebar.ant-btn:hover,.language-switcher--sidebar.ant-btn:focus{color:#fff!important;background:#334155!important;border-color:#334155!important}.language-switcher--drawer.ant-btn,.language-switcher--floating.ant-btn{height:40px;color:var(--color-text-primary);background:#fff!important;border:1px solid #e2e8f0!important}.language-switcher--drawer.ant-btn{width:100%;justify-content:space-between}.app-user-avatar{background:#dbeafe!important;color:var(--color-primary)!important}.app-user-name{font-weight:600}.app-shell-content{flex:1;min-height:0;padding:24px 28px 28px;overflow-y:auto}.app-shell-content--student{padding-bottom:112px}.page-section{display:flex;flex-direction:column;gap:24px}.page-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;min-height:72px;padding:16px 24px;background:var(--color-surface);border-radius:16px;border:1px solid #e2e8f0}.page-header__meta{min-width:0;flex:1}.page-header__actions{display:flex;align-items:center;justify-content:flex-end;gap:12px;flex-wrap:wrap}.page-header--analytics .page-header__actions{flex:0 0 auto}.page-title{margin:0;font-size:28px;font-weight:700;line-height:1.1}.page-subtitle{margin:8px 0 0;color:#475569;font-size:14px}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.chart-grid{display:grid;grid-template-columns:2fr 1fr;gap:16px}.card-shadow{box-shadow:var(--shadow-card)}.card-shadow.ant-card,.ant-card.card-shadow{border-radius:16px;border:none;background:var(--color-surface)}.ant-card.card-shadow .ant-card-body,.card-shadow.ant-card .ant-card-body{padding:20px}.ant-table-wrapper .ant-table{border-radius:16px}.ant-table-wrapper .ant-table-thead>tr>th{background:#f8fafc;color:var(--color-text-secondary);font-size:13px;font-weight:600;border-bottom:1px solid #e2e8f0}.ant-table-wrapper .ant-table-tbody>tr>td{border-bottom:1px solid #eef2f7}.ant-input,.ant-input-affix-wrapper,.ant-select-selector,.ant-picker,.ant-input-number,.ant-input-number-input-wrap{border-radius:12px!important}.ant-btn{border-radius:12px;height:42px;font-weight:600}.ant-btn-primary{box-shadow:none}.stat-card{display:flex;flex-direction:column;gap:12px;min-height:132px;padding:20px;background:var(--color-surface);border-radius:16px}.stat-card__title{color:var(--color-text-secondary);font-size:14px}.stat-card__value{color:var(--color-text-primary);font-size:34px;font-weight:700;line-height:1;letter-spacing:-.03em}.stat-card__suffix{margin-left:4px;font-size:18px}.stat-card__hint{color:var(--color-text-secondary);font-size:13px;line-height:1.5}.status-tag{display:inline-flex;align-items:center;justify-content:center;min-height:32px;padding:6px 12px;border-radius:12px;font-size:13px;font-weight:600;white-space:nowrap}.status-tag--success{color:var(--color-success);background:#e8f7ed}.status-tag--warning{color:var(--color-warning);background:#fef3c7}.status-tag--danger{color:var(--color-danger);background:#fee2e2}.status-tag--info{color:var(--color-primary);background:#dbeafe}.status-tag--neutral{color:var(--color-text-secondary);background:#e2e8f0}.state-panel{display:flex;flex-direction:column;align-items:flex-start;gap:12px;padding:24px;background:var(--color-surface);border-radius:16px;border:1px solid #e2e8f0;box-shadow:var(--shadow-card)}.state-panel__badge{padding:6px 12px;border-radius:999px;font-size:12px;font-weight:700}.state-panel--empty .state-panel__badge{background:#eef4ff;color:var(--color-primary)}.state-panel--error .state-panel__badge{background:#fee2e2;color:var(--color-danger)}.state-panel__title{font-size:24px;font-weight:700;color:var(--color-text-primary)}.state-panel__description{max-width:560px;color:var(--color-text-secondary);line-height:1.6}.editor-shell{display:flex;flex-direction:column;height:clamp(420px,calc(100vh - 320px),720px);min-height:560px;border-radius:16px;overflow:hidden;background:#fff;box-shadow:0 12px 30px #0f172a14}.editor-shell .editor-toolbar{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid #e2e8f0}.editor-stage{flex:1;min-height:0}.editor-stage>div{height:100%;min-height:0}.result-panel{background:#e2e8f0;border-top:1px solid #cbd5e1;min-height:220px}.student-debug-panel{margin-bottom:16px;padding:0 0 16px;border-bottom:1px solid #cbd5e1}.table-scroll{overflow-x:auto}.analytics-attempts-card .ant-card-body{display:flex;flex-direction:column;gap:20px}.analytics-attempts-card__description.ant-typography{margin:8px 0 0!important;max-width:880px;color:var(--color-text-secondary)}.analytics-page__quiz-select.ant-select{min-width:180px}.analytics-page__quiz-select.ant-select-single,.question-filter-card__status.ant-select-single,.teacher-materials-filter__status.ant-select-single{height:42px;min-height:42px}.analytics-page__quiz-select .ant-select-selector,.question-filter-card__status .ant-select-selector,.teacher-materials-filter__status .ant-select-selector{height:42px!important;min-height:42px!important;display:flex;align-items:center;padding-inline-end:32px!important;border-radius:12px!important}.analytics-page__quiz-select .ant-select-selection-wrap,.question-filter-card__status .ant-select-selection-wrap,.teacher-materials-filter__status .ant-select-selection-wrap{align-items:center}.analytics-page__quiz-select .ant-select-arrow,.question-filter-card__status .ant-select-arrow,.teacher-materials-filter__status .ant-select-arrow{top:50%;inset-inline-end:12px;margin-top:0;transform:translateY(-50%)}.analytics-page__export-button.ant-btn{height:42px;min-height:42px;padding:0 16px;border-radius:12px;display:inline-flex;align-items:center;justify-content:center;line-height:1;white-space:nowrap;flex:0 0 auto}.analytics-page__export-button.ant-btn>span{display:inline-flex;align-items:center;line-height:1}.quiz-editor-form__primary-row{width:100%}.quiz-editor-form{display:flex;flex-direction:column;gap:24px}.quiz-editor-form__info-card .ant-card-body{display:flex;flex-direction:column;gap:20px}.quiz-editor-form__primary-row .quiz-editor-form__field,.quiz-editor-form__description-field{margin-bottom:0}.quiz-editor-form__primary-row .ant-input,.quiz-editor-form__primary-row .ant-select-single,.quiz-editor-form__primary-row .ant-picker{height:42px;min-height:42px}.quiz-editor-form__primary-row .ant-input{padding-block:0;line-height:40px}.quiz-editor-form__primary-row .ant-select-selector,.quiz-editor-form__primary-row .ant-picker{height:42px!important;min-height:42px!important;display:flex;align-items:center;padding-inline-end:32px!important}.quiz-editor-form__primary-row .ant-select-selection-wrap{align-items:center}.quiz-editor-form__primary-row .ant-select-arrow{top:50%;margin-top:0;transform:translateY(-50%)}.quiz-editor-form__primary-row .ant-picker-suffix{display:inline-flex;align-items:center;align-self:stretch;margin:0;transform:none}.quiz-editor-form__primary-row .ant-picker-input>input{height:40px}.analytics-attempt-table-wrap{overflow-x:auto}.analytics-metrics-card .ant-card-body{padding:0}.analytics-metrics-card__grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr))}.analytics-metrics-card__item{display:flex;flex-direction:column;gap:12px;min-height:132px;padding:20px}.analytics-metrics-card__item+.analytics-metrics-card__item{border-inline-start:1px solid #e2e8f0}.analytics-metrics-card__label{color:var(--color-text-secondary);font-size:14px}.analytics-metrics-card__value{color:var(--color-text-primary);font-size:34px;font-weight:700;line-height:1;letter-spacing:-.03em}.analytics-attempt-table{min-width:980px;border:1px solid #e2e8f0;border-radius:16px;overflow:hidden;background:#fff}.analytics-attempt-table__row{display:grid;grid-template-columns:minmax(84px,.95fr) minmax(96px,1.05fr) minmax(140px,1.45fr) minmax(124px,1.3fr) minmax(120px,1.25fr) minmax(96px,1fr) minmax(170px,1.7fr) minmax(82px,.9fr);gap:8px;align-items:stretch}.analytics-attempt-table__row--head{min-height:48px;padding:0 12px;background:#f8fafc;border-bottom:1px solid #e2e8f0}.analytics-attempt-table__row--body{padding:12px;border-bottom:1px solid #e2e8f0}.analytics-attempt-table__row--light{background:#fff}.analytics-attempt-table__row--muted{background:#f8fafc}.analytics-attempt-table__head{display:flex;align-items:center;color:var(--color-text-secondary);font-size:12px;font-weight:600}.analytics-attempt-table__cell{min-width:0;display:flex;align-items:flex-start}.analytics-attempt-table__primary.ant-typography,.analytics-attempt-table__primary{color:var(--color-text-primary);font-size:12px;font-weight:700;line-height:1.6}.analytics-attempt-table__secondary.ant-typography,.analytics-attempt-table__secondary{color:var(--color-text-primary);font-size:12px;line-height:1.6}.analytics-attempt-table__multiline.ant-typography,.analytics-attempt-table__multiline{margin:0;color:var(--color-text-primary);font-size:11px;line-height:1.6;white-space:pre-line;word-break:break-word}.analytics-attempt-table__multiline--mono.ant-typography,.analytics-attempt-table__multiline--mono{font-family:JetBrains Mono,monospace}.analytics-attempt-table__multiline--subtle.ant-typography,.analytics-attempt-table__multiline--subtle{color:#475569}.analytics-attempt-table__multiline--accent.ant-typography,.analytics-attempt-table__multiline--accent{color:#2563eb;font-family:Plus Jakarta Sans,PingFang SC,sans-serif;font-weight:600}.analytics-attempt-table__multiline--muted.ant-typography,.analytics-attempt-table__multiline--muted{color:#64748b}.analytics-attempt-result.ant-typography,.analytics-attempt-result{font-family:JetBrains Mono,monospace;font-size:11px;font-weight:600;line-height:1.6;word-break:break-word}.analytics-attempt-result--success.ant-typography,.analytics-attempt-result--success{color:#15803d}.analytics-attempt-result--warning.ant-typography,.analytics-attempt-result--warning{color:#d97706}.analytics-attempt-result--danger.ant-typography,.analytics-attempt-result--danger{color:#dc2626}.analytics-attempt-result--neutral.ant-typography,.analytics-attempt-result--neutral{color:#64748b}.analytics-attempt-table__footer{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px;background:#fff}.analytics-attempt-table__footer-note.ant-typography{color:#475569;font-size:12px}.analytics-attempt-table__footer-sync.ant-typography{color:#2563eb;font-size:12px;font-weight:600}.analytics-attempt-pagination{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.analytics-attempt-pagination__total.ant-typography{color:var(--color-text-secondary)}.monitor-code-view,.monitor-output-view{margin:0;padding:14px 16px;border-radius:14px;background:#0f172a;color:#e2e8f0;overflow-x:auto;white-space:pre-wrap;word-break:break-word}.teacher-header-actions,.student-header-actions{display:flex;gap:12px;align-items:center}.ai-assistant-fab.ant-btn{position:fixed;right:24px;bottom:24px;z-index:900;width:56px;min-width:56px;height:56px;border:none;background:var(--color-primary)!important;box-shadow:0 18px 38px #2563eb47}.ai-assistant-fab.ant-btn:hover,.ai-assistant-fab.ant-btn:focus{background:#1d4ed8!important}.ai-assistant-fab.ant-btn .anticon{font-size:22px}.ai-assistant-modal-window .ant-modal-content{padding:0;overflow:hidden;border-radius:24px}.ai-assistant-modal-window .ant-modal-header{margin-bottom:0;padding:18px 20px 0}.ai-assistant-modal-window .ant-modal-body{padding:0}.ai-assistant-modal__title-wrap{display:flex;flex-direction:column;gap:4px}.ai-assistant-modal__title{color:var(--color-text-primary);font-size:18px;font-weight:700}.ai-assistant-modal__subtitle{color:var(--color-text-secondary);font-size:13px}.ai-assistant-modal{display:flex;flex-direction:column;max-height:72vh;min-height:520px}.ai-assistant-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 20px 0;background:#fff}.ai-assistant-toolbar__meta{display:flex;align-items:center;gap:8px}.ai-assistant-toolbar__pill{padding:6px 12px;border-radius:999px;background:#eef4ff;color:var(--color-primary);font-size:12px;font-weight:700}.ai-assistant-toolbar__levels{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.ai-assistant-toolbar__label{color:var(--color-text-secondary);font-size:12px}.ai-assistant-modal__messages{flex:1;min-height:0;overflow-y:auto;padding:20px;background:#f8fafc}.ai-assistant-empty{display:flex;flex-direction:column;gap:10px;padding:14px 16px;border-radius:16px;background:#eef4ff;margin-bottom:16px}.ai-assistant-empty__badge{color:var(--color-primary);font-size:12px;font-weight:700}.ai-assistant-empty__text.ant-typography{margin:0!important;color:var(--color-text-primary)}.ai-assistant-message{display:flex;margin-bottom:16px}.ai-assistant-message--user{justify-content:flex-end}.ai-assistant-message__bubble{max-width:320px;display:flex;flex-direction:column;gap:12px;padding:14px 16px;border-radius:18px;background:#fff;border:1px solid #e2e8f0}.ai-assistant-message--user .ai-assistant-message__bubble{color:#fff;background:var(--color-primary);border-color:transparent}.ai-assistant-message__bubble--loading{flex-direction:row;align-items:center}.ai-assistant-message__cursor{width:10px;height:18px;border-radius:999px;background:var(--color-primary);animation:ai-assistant-cursor-blink 1s steps(1) infinite}.ai-assistant-message__body{display:flex;flex-direction:column;gap:10px}.ai-assistant-markdown{color:inherit}.ai-assistant-message__content.ant-typography{margin:0!important;white-space:pre-wrap;color:inherit}.ai-assistant-heading{margin:0;color:inherit;font-weight:700;line-height:1.45}.ai-assistant-heading--h1,.ai-assistant-heading--h2{font-size:16px}.ai-assistant-heading--h3,.ai-assistant-heading--h4,.ai-assistant-heading--h5,.ai-assistant-heading--h6{font-size:14px}.ai-assistant-strong{font-weight:700}.ai-assistant-list{margin:0;padding-left:20px;color:inherit}.ai-assistant-list__item{margin:0}.ai-assistant-inline-code{display:inline-block;padding:1px 6px;border-radius:8px;background:#e2e8f0;color:#0f172a;font-family:JetBrains Mono,monospace;font-size:12px;line-height:1.6}.ai-assistant-code-block{overflow:hidden;border-radius:14px;border:1px solid #cbd5e1;background:#0f172a;color:#e2e8f0}.ai-assistant-code-block__header{padding:8px 12px;border-bottom:1px solid rgba(148,163,184,.22);background:#94a3b824;color:#cbd5e1;font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase}.ai-assistant-code-block__content{margin:0;padding:14px 16px;overflow-x:auto;white-space:pre-wrap;word-break:break-word;font-family:JetBrains Mono,monospace;font-size:13px;line-height:1.7}.ai-assistant-message--user .ai-assistant-inline-code{background:#ffffff2e;color:#fff}.ai-assistant-message--user .ai-assistant-code-block{border-color:#fff3;background:#0f172a42}.ai-assistant-message--user .ai-assistant-code-block__header{background:#ffffff14;color:#fffc}@keyframes ai-assistant-cursor-blink{0%,49%{opacity:1}50%,to{opacity:0}}.ai-assistant-citations{display:flex;flex-direction:column;gap:8px}.ai-assistant-citations__label{color:var(--color-primary);font-size:12px;font-weight:700}.ai-assistant-citation{display:flex;flex-direction:column;gap:4px;padding:10px 12px;border-radius:12px;background:#f8fafc;border:1px solid #d9e2f0}.ai-assistant-citation__title{color:var(--color-text-primary);font-size:13px;font-weight:600}.ai-assistant-citation__pages{color:var(--color-text-secondary);font-size:13px;line-height:1.5}.ai-assistant-error{margin-top:4px;padding:12px 14px;border-radius:14px;background:#fee2e2;color:var(--color-danger);font-size:13px;line-height:1.5}.ai-assistant-modal__composer{display:flex;align-items:flex-end;gap:12px;padding:16px 20px 20px;border-top:1px solid #e2e8f0;background:#fff}.ai-assistant-mode-card.ant-btn{height:auto;padding:18px 20px;text-align:left;border-radius:18px}.ai-assistant-mode-card__title{font-size:16px;font-weight:700;color:var(--color-text-primary);margin-bottom:8px}.ai-assistant-mode-card__description{white-space:normal;line-height:1.6;color:var(--color-text-secondary)}.text-secondary{color:var(--color-text-secondary);line-height:1.6}.teacher-materials-filter{display:flex;flex-direction:column;gap:16px}.question-filter-card{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.question-filter-card__controls,.teacher-materials-filter__controls{display:flex;align-items:center;gap:16px;flex-wrap:wrap;min-width:0}.question-filter-card__search,.teacher-materials-filter__search{width:320px;max-width:100%}.question-filter-card__search .ant-input-prefix,.teacher-materials-filter__search .ant-input-prefix{color:#94a3b8}.question-filter-card__status.ant-select,.teacher-materials-filter__status.ant-select{width:168px}.teacher-materials-title-cell{display:flex;flex-direction:column;gap:4px}.sr-only-file-input{position:fixed;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.login-page{position:relative;min-height:100vh;display:grid;grid-template-columns:1.1fr .9fr;background:radial-gradient(circle at top left,rgba(37,99,235,.18),transparent 36%),linear-gradient(180deg,#f8fbff,#eef4fb)}.login-page__actions{position:absolute;top:24px;right:24px;z-index:2}.login-brand .ant-typography{color:var(--color-text-primary)}.login-brand{padding:72px;display:flex;flex-direction:column;justify-content:center;gap:24px}.login-card-wrap{display:flex;align-items:center;justify-content:center;padding:48px}.three-column-grid{display:grid;grid-template-columns:280px minmax(0,1fr) 360px;gap:16px}.student-class-card{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(280px,.8fr);gap:16px;align-items:start}.student-class-card__main{display:flex;flex-direction:column;gap:8px}.student-class-card__note{display:flex;flex-direction:column;gap:8px;padding:16px 18px;border-radius:12px;background:var(--color-surface-muted);color:var(--color-text-primary)}.student-stats-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.student-filter-card{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.student-filter-card__controls{display:flex;align-items:center;gap:12px;flex-wrap:wrap;min-width:0}.student-filter-card__search{width:320px;max-width:100%}.student-filter-card__search .ant-input-prefix{color:#94a3b8}.student-filter-card__status.ant-select{width:168px}.student-filter-card__hint.ant-typography{color:var(--color-text-secondary)}.student-question-layout{display:grid;grid-template-columns:minmax(320px,40%) minmax(0,60%);gap:16px;align-items:start}.student-right-stack{display:grid;grid-template-rows:minmax(0,1fr) minmax(220px,auto);gap:16px;min-height:0}.student-question-layout>*,.student-right-stack>*{min-height:0}.code-font{font-family:JetBrains Mono,Fira Code,monospace}.app-mobile-nav-trigger{display:none}.app-mobile-drawer{display:flex;flex-direction:column;justify-content:space-between;gap:24px;min-height:100%}.app-mobile-drawer__footer{display:flex;flex-direction:column;gap:8px}@media(max-width:1200px){.app-sider.ant-layout-sider{display:none}.app-topbar.ant-layout-header{margin-left:20px;margin-right:20px}.app-shell-content{padding:20px}.app-shell-content--student{padding-bottom:104px}.app-mobile-nav-trigger{display:inline-flex;align-items:center}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.chart-grid,.three-column-grid,.student-class-card,.student-question-layout{grid-template-columns:1fr}.page-header__actions{width:100%;justify-content:flex-start}.student-stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.analytics-metrics-card__grid{grid-template-columns:repeat(3,minmax(0,1fr))}.analytics-metrics-card__item:nth-child(4){border-inline-start:none}.student-right-stack{grid-template-rows:auto auto}.editor-shell{height:520px;min-height:520px}.ai-assistant-fab.ant-btn{right:20px;bottom:20px}}@media(max-width:768px){.student-stats-grid{grid-template-columns:1fr}.analytics-metrics-card__grid{grid-template-columns:repeat(2,minmax(0,1fr))}.analytics-metrics-card__item{min-height:120px}.analytics-metrics-card__item:nth-child(odd){border-inline-start:none}.analytics-page__quiz-select.ant-select,.student-filter-card__search,.student-filter-card__status.ant-select,.question-filter-card__search,.question-filter-card__status.ant-select,.teacher-materials-filter__search,.teacher-materials-filter__status.ant-select,.student-filter-card__controls,.question-filter-card__controls,.teacher-materials-filter__controls{width:100%}.app-shell-content--student{padding-bottom:96px}.analytics-attempt-pagination{align-items:flex-start}.analytics-attempt-table__footer{flex-direction:column;align-items:flex-start}.ai-assistant-modal{min-height:460px}.ai-assistant-toolbar{flex-direction:column;align-items:flex-start}.ai-assistant-modal__composer{flex-direction:column;align-items:stretch}}@media(max-width:560px){.analytics-metrics-card__grid{grid-template-columns:1fr}.analytics-metrics-card__item+.analytics-metrics-card__item,.analytics-metrics-card__item:nth-child(odd),.analytics-metrics-card__item:nth-child(4){border-inline-start:none;border-top:1px solid #e2e8f0}}