:root{--color-brand-dark: #0d1b2e;--color-brand-mid: #1c3150;--color-teacher-800: #312e81;--color-teacher-700: #3730a3;--color-teacher-600: #4338ca;--color-teacher-500: #4f46e5;--color-teacher-400: #818cf8;--color-teacher-200: #c7d2fe;--color-teacher-100: #ede9fe;--color-teacher-50: #f5f3ff;--color-student-700: #115e59;--color-student-600: #0f766e;--color-student-500: #0d9488;--color-student-400: #2dd4bf;--color-student-300: #5eead4;--color-student-200: #99f6e4;--color-student-100: #ccfbf1;--color-student-50: #f0fdfa;--color-success-800: #166534;--color-success-700: #15803d;--color-success-600: #16a34a;--color-success-500: #22c55e;--color-success-200: #bbf7d0;--color-success-100: #dcfce7;--color-success-50: #f0fdf4;--color-warning-900: #78350f;--color-warning-800: #92400e;--color-warning-700: #b45309;--color-warning-600: #d97706;--color-warning-500: #f59e0b;--color-warning-200: #fde68a;--color-warning-100: #fef3c7;--color-warning-50: #fffbeb;--color-error-800: #991b1b;--color-error-700: #b91c1c;--color-error-600: #dc2626;--color-error-500: #ef4444;--color-error-400: #f87171;--color-error-300: #fca5a5;--color-error-200: #fecaca;--color-error-100: #fee2e2;--color-error-50: #fef2f2;--color-info-700: #1d4ed8;--color-info-500: #3b82f6;--color-info-100: #dbeafe;--color-gray-950: #0a0f1a;--color-gray-900: #111827;--color-gray-800: #1e293b;--color-gray-700: #334155;--color-gray-600: #475569;--color-gray-500: #64748b;--color-gray-400: #94a3b8;--color-gray-300: #cbd5e1;--color-gray-200: #e2e8f0;--color-gray-100: #f1f5f9;--color-gray-50: #f8fafc;--color-white: #ffffff;--font-family: "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--font-normal: 400;--font-medium: 500;--font-semibold: 600;--font-bold: 700;--leading-tight: 1.25;--leading-snug: 1.375;--leading-normal: 1.5;--leading-relaxed: 1.625;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--shadow-sm: 0 1px 3px rgba(15, 23, 42, .08);--shadow-md: 0 4px 12px rgba(15, 23, 42, .1);--shadow-lg: 0 12px 28px rgba(15, 23, 42, .12);--shadow-card: 0 2px 8px rgba(15, 23, 42, .06), 0 1px 2px rgba(15, 23, 42, .04);--shadow-header: 0 18px 36px rgba(10, 15, 30, .2);--transition-fast: .12s ease;--transition-base: .16s ease;--transition-slow: .24s ease;--content-max-width: 1200px;--header-height: 72px}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;font-family:var(--font-family);font-size:var(--text-base);font-weight:var(--font-normal);line-height:var(--leading-normal);color:var(--color-gray-800);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{margin:0;font-weight:var(--font-bold);line-height:var(--leading-tight);color:var(--color-gray-900)}p{margin:0}a{color:var(--color-teacher-500);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-teacher-600)}img,svg{display:block;max-width:100%}button,input,textarea,select{font-family:inherit;font-size:inherit}ul,ol{margin:0;padding:0;list-style:none}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--color-gray-100)}::-webkit-scrollbar-thumb{background:var(--color-gray-300);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-gray-400)}:focus-visible{outline:2px solid var(--color-teacher-500);outline-offset:2px;border-radius:var(--radius-sm)}.app-shell{display:flex;flex-direction:column;min-height:100vh}.app-shell--teacher{background:linear-gradient(180deg,#f8fafc,#eef2ff);background-attachment:fixed}.app-shell--student{background:linear-gradient(180deg,#f0fdfa,#f8fafc);background-attachment:fixed}.app-shell--auth{background:var(--color-brand-dark);background-image:radial-gradient(ellipse at 20% 50%,rgba(79,70,229,.1) 0%,transparent 50%),radial-gradient(ellipse at 80% 20%,rgba(13,148,136,.08) 0%,transparent 40%);min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-8) var(--space-4)}.auth-layout{width:100%;max-width:520px;display:flex;flex-direction:column;align-items:center}.auth-brand{display:flex;flex-direction:column;align-items:center;gap:var(--space-2);margin-bottom:var(--space-6);text-align:center}.auth-brand__logo{width:52px;height:52px;object-fit:contain;filter:brightness(0) invert(1)}.auth-brand__name{font-size:var(--text-xl);font-weight:var(--font-bold);color:#fffffff2;letter-spacing:-.01em}.auth-brand__tagline{font-size:var(--text-sm);color:#ffffff80;max-width:300px;line-height:1.5}.auth-card{background:var(--color-white);border-radius:var(--radius-xl);box-shadow:0 24px 48px #00000059,0 4px 12px #0003;padding:var(--space-8);width:100%;max-width:420px;display:flex;flex-direction:column;gap:var(--space-5)}.auth-card--wide{max-width:520px}.auth-platform-note{margin-top:var(--space-5);font-size:var(--text-xs);color:#ffffff47;text-align:center;letter-spacing:.03em}.auth-heading{font-size:var(--text-2xl);font-weight:var(--font-bold);color:var(--color-gray-900);margin:0;text-align:center}.auth-subheading{font-size:var(--text-sm);color:var(--color-gray-500);text-align:center;margin:calc(-1 * var(--space-3)) 0 0}.auth-role-group{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3)}.auth-role-btn{display:flex;flex-direction:column;align-items:center;gap:var(--space-2);padding:var(--space-4) var(--space-3);border-radius:var(--radius-lg);border:2px solid var(--color-gray-200);background:var(--color-gray-50);cursor:pointer;transition:border-color var(--transition-fast),background var(--transition-fast),box-shadow var(--transition-fast)}.auth-role-btn:hover{border-color:var(--color-gray-300);background:var(--color-white)}.auth-role-btn__icon{font-size:1.75rem;line-height:1}.auth-role-btn__label{font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--color-gray-700)}.auth-role-btn--active.auth-role-btn--student{border-color:var(--color-student-500);background:var(--color-student-50);box-shadow:0 0 0 3px #0d948826}.auth-role-btn--active.auth-role-btn--student .auth-role-btn__label{color:var(--color-student-700)}.auth-role-btn--active.auth-role-btn--teacher{border-color:var(--color-teacher-500);background:var(--color-teacher-50);box-shadow:0 0 0 3px #4f46e526}.auth-role-btn--active.auth-role-btn--teacher .auth-role-btn__label{color:var(--color-teacher-700)}.auth-fields-2col{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-4)}.auth-footer-text{text-align:center;font-size:var(--text-sm);color:var(--color-gray-500);margin:0}.auth-footer-link{color:var(--color-teacher-600);font-weight:var(--font-medium)}.auth-footer-link:hover{color:var(--color-teacher-700)}.app-main{flex:1;display:flex;flex-direction:column}.page-shell{width:100%;max-width:var(--content-max-width);margin:0 auto;padding:var(--space-8) var(--space-6)}.page-shell--wide{max-width:1440px}.page-shell--narrow{max-width:760px}.page-header{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--space-4);margin-bottom:var(--space-6)}.page-header__left{flex:1;min-width:0}.page-header__actions{display:flex;align-items:center;gap:var(--space-3);flex-shrink:0}.page-title{font-size:var(--text-2xl);font-weight:var(--font-bold);color:var(--color-gray-900);line-height:var(--leading-tight)}.page-subtitle{margin-top:var(--space-1);font-size:var(--text-sm);color:var(--color-gray-500)}.breadcrumb{display:flex;align-items:center;gap:var(--space-2);margin-bottom:var(--space-2);font-size:var(--text-sm);color:var(--color-gray-500)}.breadcrumb__item{color:var(--color-gray-500)}.breadcrumb__item--link{color:var(--color-teacher-500);font-weight:var(--font-medium)}.breadcrumb__item--link:hover{color:var(--color-teacher-600)}.breadcrumb__sep{color:var(--color-gray-300);font-size:var(--text-xs);-webkit-user-select:none;user-select:none}.page-actions{display:flex;align-items:center;gap:var(--space-3);flex-shrink:0}.section{margin-bottom:var(--space-8)}.section-title{font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--color-gray-800);margin-bottom:var(--space-4)}.card-grid{display:grid;gap:var(--space-5);grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}.card-grid--2{grid-template-columns:repeat(auto-fill,minmax(340px,1fr))}.card-grid--3{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}.split-layout{display:grid;grid-template-columns:1fr 340px;gap:var(--space-6);align-items:start}.studio-layout{display:grid;grid-template-columns:minmax(360px,.9fr) minmax(0,2fr);gap:var(--space-6);align-items:start}.studio-layout>*{min-width:0}.studio-layout .sticky-panel{position:static;max-height:none;overflow:visible}.studio-layout .card{min-width:0}.studio-two-field-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:var(--space-4)}.seg-group{display:flex;gap:var(--space-1);flex-wrap:wrap}.seg-btn{flex:1;min-width:0;padding:var(--space-2) var(--space-3);font-size:var(--text-xs);font-weight:var(--font-semibold);background:var(--color-white);border:1px solid var(--color-gray-300);border-radius:var(--radius-sm);cursor:pointer;color:var(--color-gray-600);transition:background var(--transition-fast),color var(--transition-fast),border-color var(--transition-fast);white-space:nowrap;text-align:center}.seg-btn:hover:not(:disabled){background:var(--color-gray-50);color:var(--color-gray-800)}.seg-btn--active{background:var(--color-teacher-50);border-color:var(--color-teacher-500);color:var(--color-teacher-600);font-weight:var(--font-bold)}.seg-btn:disabled{opacity:.4;cursor:not-allowed}.copilot-workflow{display:grid;grid-template-columns:repeat(auto-fit,minmax(92px,1fr));gap:var(--space-2)}.copilot-workflow__step{display:flex;align-items:center;gap:var(--space-2);min-width:0;padding:var(--space-2) var(--space-3);border:1px solid var(--color-gray-200);border-radius:var(--radius-sm);background:var(--color-white);color:var(--color-gray-500);font-size:var(--text-xs);font-weight:var(--font-semibold)}.copilot-workflow__index{display:inline-flex;align-items:center;justify-content:center;width:1.25rem;height:1.25rem;border-radius:9999px;background:var(--color-gray-100);color:var(--color-gray-500);flex-shrink:0}.copilot-workflow__step--active{border-color:var(--color-teacher-300);background:var(--color-teacher-50);color:var(--color-teacher-700)}.copilot-workflow__step--active .copilot-workflow__index{background:var(--color-teacher-500);color:var(--color-white)}.copilot-workflow__step--done{border-color:var(--color-success-200);background:var(--color-success-50);color:var(--color-success-700)}.copilot-workflow__step--done .copilot-workflow__index{background:var(--color-success-600);color:var(--color-white)}.studio-flow-bar{position:sticky;top:var(--header-height);z-index:4;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:var(--space-2);margin-bottom:var(--space-5);padding:var(--space-3);background:#fffffff0;border:1px solid var(--color-gray-200);border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.studio-flow-step{display:flex;align-items:center;gap:var(--space-2);min-width:0;padding:var(--space-2) var(--space-3);border:1px solid var(--color-gray-200);border-radius:var(--radius-sm);background:var(--color-white);color:var(--color-gray-500);font-size:var(--text-xs);font-weight:var(--font-semibold)}.studio-flow-step__index{display:inline-flex;align-items:center;justify-content:center;width:1.35rem;height:1.35rem;border-radius:var(--radius-full);background:var(--color-gray-100);color:var(--color-gray-500);flex-shrink:0}.studio-flow-step__label{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.studio-flow-step--active{border-color:var(--color-teacher-300);background:var(--color-teacher-50);color:var(--color-teacher-700)}.studio-flow-step--active .studio-flow-step__index{background:var(--color-teacher-500);color:var(--color-white)}.studio-flow-step--done{border-color:var(--color-success-200);background:var(--color-success-50);color:var(--color-success-700)}.studio-flow-step--done .studio-flow-step__index{background:var(--color-success-600);color:var(--color-white)}.studio-collapsible-card__header{align-items:center;gap:var(--space-3)}.studio-collapsible-card__title{margin:0;padding:0;border:0}.studio-collapsible-card__toggle{border:1px solid var(--color-gray-200);background:var(--color-white);color:var(--color-gray-600);border-radius:var(--radius-sm);padding:var(--space-1) var(--space-2);font-size:var(--text-xs);font-weight:var(--font-semibold);cursor:pointer}.studio-share-preview{display:flex;flex-direction:column;gap:var(--space-3);padding:var(--space-3);background:var(--color-teacher-50);border:1px solid var(--color-teacher-200);border-radius:var(--radius-sm)}.studio-share-preview__actions{display:flex;flex-wrap:wrap;gap:var(--space-2)}.studio-question-card{transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.studio-question-card:hover{border-color:var(--color-teacher-200)!important;box-shadow:var(--shadow-sm)}.studio-question-summary{display:flex;flex-direction:column;gap:var(--space-2);color:var(--color-gray-600);font-size:var(--text-sm);line-height:var(--leading-relaxed)}.studio-question-summary p{margin:0}.section-title{margin:0 0 var(--space-4);font-size:var(--text-base);font-weight:var(--font-semibold);color:var(--color-gray-800);padding-bottom:var(--space-3);border-bottom:1px solid var(--color-gray-100)}.save-bar{display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);margin-bottom:var(--space-5);padding:var(--space-3) var(--space-4);background:var(--color-white);border:1px solid var(--color-gray-200);border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.save-status{font-size:var(--text-sm);color:var(--color-success-700);font-weight:var(--font-medium)}.sticky-panel{position:sticky;top:calc(var(--header-height) + var(--space-6));max-height:calc(100vh - var(--header-height) - var(--space-12));overflow-y:auto}.table-wrapper{overflow-x:auto;border-radius:var(--radius-md);border:1px solid var(--color-gray-200);background:var(--color-white)}.table{width:100%;border-collapse:collapse;font-size:var(--text-sm)}.table th{padding:var(--space-3) var(--space-4);text-align:left;font-size:var(--text-xs);font-weight:var(--font-semibold);text-transform:uppercase;letter-spacing:.06em;color:var(--color-gray-500);background:var(--color-gray-50);border-bottom:1px solid var(--color-gray-200);white-space:nowrap}.table td{padding:var(--space-3) var(--space-4);color:var(--color-gray-700);border-bottom:1px solid var(--color-gray-100);vertical-align:middle}.table tbody tr:last-child td{border-bottom:none}.table tbody tr:hover td{background:var(--color-gray-50)}@keyframes fade-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@keyframes slide-down{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:fade-in var(--transition-slow) ease both}.animate-slide-down{animation:slide-down var(--transition-base) ease 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var(--space-6)}.app-navbar{max-width:1440px;margin:0 auto;min-height:var(--header-height);display:flex;align-items:center;justify-content:space-between;gap:var(--space-5);padding:0 var(--space-6);border-radius:0 0 var(--radius-xl) var(--radius-xl);background:linear-gradient(135deg,var(--color-brand-dark) 0%,var(--color-brand-mid) 100%);color:var(--color-white);box-shadow:var(--shadow-header);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.app-logo{display:inline-flex;align-items:center;gap:var(--space-3);text-decoration:none;color:var(--color-white);flex-shrink:0}.app-logo:hover{color:var(--color-white);opacity:.9}.app-logo-img{width:120px;height:auto;display:block;object-fit:contain}.app-logo-text{font-size:var(--text-sm);font-weight:var(--font-bold);letter-spacing:.01em;white-space:nowrap;color:#ffffffd9}.app-nav-toggle{display:none;width:36px;height:36px;align-items:center;justify-content:center;background:#ffffff1a;border:1px solid rgba(255,255,255,.15);border-radius:var(--radius-sm);cursor:pointer;flex-shrink:0}.app-nav-hamburger{display:block;width:18px;height:2px;background:var(--color-white);border-radius:1px;position:relative}.app-nav-hamburger:before,.app-nav-hamburger:after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--color-white);border-radius:1px}.app-nav-hamburger:before{top:-5px}.app-nav-hamburger:after{top:5px}.app-nav-links{display:flex;align-items:center;gap:var(--space-1);flex:1}.app-nav-link{padding:var(--space-2) var(--space-3);font-size:var(--text-sm);font-weight:var(--font-semibold);color:#ffffffc7;text-decoration:none;border-radius:var(--radius-sm);border-bottom:2px solid transparent;transition:color var(--transition-fast),background var(--transition-fast);white-space:nowrap}.app-nav-link:hover{color:var(--color-white);background:#ffffff14}.app-nav-link--active{color:var(--color-white);border-bottom-color:#ffffffd9}.app-org-label{color:#fff9;cursor:default}.app-org-label:hover{color:#fff9;background:none}.app-nav-dropdown{position:relative}.app-nav-dropdown__trigger{display:inline-flex;align-items:center;gap:6px;background:none;border-radius:var(--radius-sm);cursor:pointer}.app-nav-dropdown__caret{width:7px;height:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg);transition:transform var(--transition-fast);flex-shrink:0}.app-nav-dropdown__caret--open{transform:rotate(225deg)}.app-nav-dropdown__menu{display:none;position:absolute;top:calc(100% + 8px);left:0;min-width:190px;flex-direction:column;padding:var(--space-2);gap:2px;background:var(--color-white);border:1px solid var(--color-gray-100);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:110}.app-nav-dropdown__menu--open{display:flex}.app-nav-dropdown__item{padding:var(--space-2) var(--space-3);border-radius:var(--radius-sm);font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-gray-700);text-decoration:none;white-space:nowrap;background:none;border:none;width:100%;text-align:left;cursor:pointer;font-family:inherit}.app-nav-dropdown__item:disabled{opacity:.6;cursor:default}.app-nav-dropdown__item:hover{background:var(--color-gray-50);color:var(--color-gray-900)}.app-nav-dropdown__item--active{background:var(--color-teacher-50);color:var(--color-teacher-700);font-weight:var(--font-semibold)}.app-user-pill{margin-left:auto;display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-1) var(--space-1) var(--space-1) var(--space-2);border-radius:var(--radius-full);background:#ffffff1a;border:1px solid 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var(--space-6);max-width:var(--content-max-width);margin:0 auto;font-size:var(--text-xs);color:var(--color-gray-400)}.app-footer--minimal{padding:var(--space-4) var(--space-6);text-align:center}.app-footer-copy{font-size:var(--text-xs);color:var(--color-gray-400);margin:0}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:0 var(--space-4);height:36px;font-size:var(--text-sm);font-weight:var(--font-medium);border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;text-decoration:none;white-space:nowrap;transition:background var(--transition-fast),border-color var(--transition-fast),color var(--transition-fast),box-shadow var(--transition-fast),opacity var(--transition-fast);-webkit-user-select:none;user-select:none}.btn:focus-visible{outline:2px solid var(--color-teacher-400);outline-offset:2px}.btn-primary{background:var(--color-teacher-600);color:var(--color-white);border-color:var(--color-teacher-600)}.btn-primary:hover{background:var(--color-teacher-700);border-color:var(--color-teacher-700)}.btn-primary-student{background:var(--color-student-600);color:var(--color-white);border-color:var(--color-student-600)}.btn-primary-student:hover{background:var(--color-student-700);border-color:var(--color-student-700)}.btn-primary-student:focus-visible{outline-color:var(--color-student-400)}.btn-secondary{background:var(--color-white);color:var(--color-gray-700);border-color:var(--color-gray-300)}.btn-secondary:hover{background:var(--color-gray-50);border-color:var(--color-gray-400)}.btn-ghost{background:transparent;color:var(--color-gray-600);border-color:transparent}.btn-danger{background:var(--color-white);color:var(--color-error-700);border-color:var(--color-error-300)}.btn-danger:hover{background:var(--color-error-50)}.btn-danger-filled{background:var(--color-error-600);color:var(--color-white);border-color:var(--color-error-600)}.btn-danger-filled:hover{background:var(--color-error-700)}.btn-success{background:var(--color-success-600);color:var(--color-white);border-color:var(--color-success-600)}.btn-success:hover{background:var(--color-success-700)}.btn-sm{height:28px;padding:0 var(--space-3);font-size:var(--text-xs);border-radius:var(--radius-sm)}.btn-lg{height:44px;padding:0 var(--space-6);font-size:var(--text-base);border-radius:var(--radius-lg)}@keyframes spin{to{transform:rotate(360deg)}}.spinner{display:inline-block;border-radius:50%;border:2px solid var(--color-gray-200);border-top-color:var(--color-teacher-500);animation:spin .7s linear infinite;flex-shrink:0}.page-loading{min-height:100vh;display:flex;align-items:center;justify-content:center}.card{background:var(--color-white);border:1px solid var(--color-gray-100);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);overflow:hidden}.card-hover{transition:box-shadow var(--transition-base),transform var(--transition-base);cursor:pointer}.card-accented--student{border-top:4px solid var(--color-student-500)}.card-accented--success{border-top:4px solid var(--color-success-500)}.card-accented--warning{border-top:4px solid var(--color-warning-500)}.card-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-4) var(--space-5);border-bottom:1px solid var(--color-gray-100);gap:var(--space-3)}.card-footer{display:flex;align-items:center;justify-content:flex-end;gap:var(--space-3);padding:var(--space-4) var(--space-5);border-top:1px solid var(--color-gray-100);background:var(--color-gray-50)}.badge{display:inline-flex;align-items:center;gap:5px;padding:2px 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var(--space-3);font-size:var(--text-sm);font-family:inherit;color:var(--color-gray-900);background:var(--color-white);border:1px solid var(--color-gray-300);border-radius:var(--radius-md);transition:border-color var(--transition-fast),box-shadow var(--transition-fast);box-sizing:border-box}.input:focus,.textarea:focus,.select:focus{outline:none;border-color:var(--color-teacher-400);box-shadow:0 0 0 3px #6366f11f}.input--error{border-color:var(--color-error-400)}.input--error:focus{border-color:var(--color-error-500);box-shadow:0 0 0 3px #ef44441f}.select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right var(--space-3) center;padding-right:var(--space-8);cursor:pointer}.tab-bar{display:flex;gap:0;border-bottom:1px solid 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transparent}.alert--error{background:var(--color-error-50);color:var(--color-error-800);border-color:var(--color-error-200)}.alert--warning{background:var(--color-warning-50);color:var(--color-warning-800);border-color:var(--color-warning-200)}.alert--success{background:var(--color-success-50);color:var(--color-success-800);border-color:var(--color-success-200)}.alert--info{background:var(--color-teacher-50);color:var(--color-teacher-800);border-color:var(--color-teacher-200)}.empty-state{text-align:center;padding:var(--space-16) var(--space-8);color:var(--color-gray-400)}.empty-state__title{font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--color-gray-600);margin:0 0 var(--space-2)}.empty-state__description{font-size:var(--text-sm);margin:0}.hint-panel{background:var(--color-warning-50);border:1px solid 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var(--space-1)}.upload-zone__hint{font-size:var(--text-xs);color:var(--color-gray-400);margin:0}.copilot-panel{background:var(--color-white);border:1px solid var(--color-gray-100);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);overflow:hidden;display:flex;flex-direction:column}.copilot-panel__header{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-4) var(--space-5);background:linear-gradient(135deg,var(--color-teacher-600) 0%,var(--color-teacher-800) 100%);color:var(--color-white)}.copilot-panel__title{font-size:var(--text-base);font-weight:var(--font-semibold);flex:1}.copilot-panel__beta{background:#fff3;color:var(--color-white);font-size:var(--text-xs);font-weight:var(--font-semibold);padding:2px 8px;border-radius:var(--radius-full)}.copilot-panel__body{padding:var(--space-5);flex:1;overflow-y:auto}.copilot-panel__status{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-2) 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var(--color-gray-200);background:var(--color-white);color:var(--color-gray-700);border-radius:var(--radius-md);padding:var(--space-2) var(--space-3);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:var(--space-2);font-size:var(--text-sm);min-height:40px}.attempt-question-nav__item--active{border-color:var(--color-student-500);background:var(--color-student-50);color:var(--color-student-700)}.attempt-question-nav__status{font-size:var(--text-xs);color:var(--color-gray-400)}.attempt-question-nav__status--answered{color:var(--color-warning-700)}.attempt-question-nav__status--scored{color:var(--color-success-700)}.attempt-actions .btn-primary-student{min-height:48px}.student-classes-layout{display:grid;grid-template-columns:minmax(260px,300px) minmax(0,1fr);grid-template-areas:"nav main" "join 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var(--transition-fast)}.student-class-nav-item:hover{background:var(--color-student-50)}.student-class-nav-item--active{background:var(--color-student-50);border-left-color:var(--color-student-500)}.student-class-nav-item__row{display:flex;align-items:center;justify-content:space-between;gap:var(--space-2)}.student-class-nav-item__title{font-weight:var(--font-semibold);font-size:var(--text-sm);color:var(--color-gray-900);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.student-class-nav-item__count{flex-shrink:0;font-size:var(--text-xs);font-weight:var(--font-semibold);color:var(--color-gray-500);background:var(--color-gray-50);border-radius:var(--radius-full);padding:1px 7px}.student-class-nav-item__sub{font-size:var(--text-xs);color:var(--color-gray-500);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.student-class-preview-summary{padding:var(--space-3);background:var(--color-student-50);border:1px solid 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var(--transition-base)}.student-class-card:hover{box-shadow:var(--shadow-md);transform:translateY(-1px)}.student-class-card__header{background:linear-gradient(135deg,var(--color-student-600),var(--color-student-800));padding:var(--space-4) var(--space-5);color:var(--color-white)}.student-class-card__title{font-size:var(--text-lg);font-weight:var(--font-bold);margin:0 0 var(--space-1);color:var(--color-white)}.student-class-card__meta{font-size:var(--text-xs);color:#ffffffbf}.student-class-card__body{padding:var(--space-4) var(--space-5);display:flex;flex-direction:column;gap:var(--space-3)}.class-info-preview{display:flex;flex-wrap:wrap;gap:var(--space-2)}.class-info-preview span{border:1px solid var(--color-gray-200);border-radius:var(--radius-full);background:var(--color-gray-50);color:var(--color-gray-600);font-size:var(--text-xs);font-weight:var(--font-semibold);padding:4px 10px}.class-info-editor{display:flex;flex-direction:column;gap:var(--space-4)}.class-info-editor__grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:var(--space-4)}.class-info-editor__field{display:flex;flex-direction:column;gap:var(--space-2)}.class-info-editor__preview{border:1px solid var(--color-gray-100);border-radius:var(--radius-md);background:var(--color-gray-50);padding:var(--space-3) var(--space-4)}.class-info-editor__preview-label{display:block;color:var(--color-gray-400);font-size:var(--text-xs);font-weight:var(--font-bold);letter-spacing:.06em;text-transform:uppercase;margin-bottom:var(--space-2)}.class-info-display{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,420px);gap:var(--space-5);align-items:start}.class-info-display__content{display:flex;flex-direction:column;gap:var(--space-4)}.class-info-block{border-left:3px solid var(--color-teacher-400);padding-left:var(--space-3)}.class-info-block__label{display:block;color:var(--color-gray-400);font-size:var(--text-xs);font-weight:var(--font-bold);letter-spacing:.06em;text-transform:uppercase;margin-bottom:var(--space-1)}.class-info-block p{margin:0;color:var(--color-gray-700);font-size:var(--text-sm);line-height:var(--leading-relaxed);white-space:pre-wrap}.class-info-video,.student-class-intro__video{width:100%;aspect-ratio:16 / 9;background:var(--color-gray-900);border-radius:var(--radius-sm);overflow:hidden}.class-info-video--portrait,.student-class-intro__video--portrait{max-width:260px;margin:0 auto;aspect-ratio:9 / 16}.class-info-video iframe,.class-info-video video,.student-class-intro__video iframe,.student-class-intro__video video{width:100%;height:100%;border:0;display:block;object-fit:cover}.class-info-video a,.student-class-intro__video a{height:100%;display:flex;align-items:center;justify-content:center;color:var(--color-white);font-weight:var(--font-semibold);padding:var(--space-4);text-align:center}.class-preview-enroll{margin-top:var(--space-4);padding-top:var(--space-4);border-top:1px solid var(--color-gray-100);display:flex;flex-direction:column;gap:var(--space-4)}.student-class-intro{display:grid;grid-template-columns:minmax(0,1fr) minmax(220px,340px);gap:var(--space-4);align-items:start;border:1px solid var(--color-student-100);border-radius:var(--radius-md);background:linear-gradient(180deg,var(--color-white),var(--color-student-50));padding:var(--space-4)}.student-class-intro--compact{margin-bottom:var(--space-2)}.student-class-intro__copy{display:flex;flex-direction:column;gap:var(--space-3)}.student-class-intro__item span{display:block;color:var(--color-student-700);font-size:var(--text-xs);font-weight:var(--font-bold);letter-spacing:.05em;text-transform:uppercase;margin-bottom:3px}.student-class-intro__item p{margin:0;color:var(--color-gray-700);font-size:var(--text-sm);line-height:var(--leading-relaxed);white-space:pre-wrap}@media (max-width: 768px){.class-info-editor__grid,.class-info-display,.student-class-intro{grid-template-columns:1fr}.class-info-video--portrait,.student-class-intro__video--portrait{max-width:min(260px,100%)}}@media (max-width: 480px){.student-class-intro,.class-preview-enroll{padding:var(--space-3)}.class-info-preview span{flex:1 1 auto;text-align:center}}.tab-count{display:inline-flex;align-items:center;justify-content:center;min-width:20px;height:20px;padding:0 6px;border-radius:var(--radius-full);background:var(--color-gray-100);color:var(--color-gray-500);font-size:var(--text-xs);font-weight:var(--font-bold);margin-left:var(--space-2);transition:background var(--transition-fast),color var(--transition-fast)}.tab-item--active .tab-count{background:var(--color-teacher-100);color:var(--color-teacher-600)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.5rem 1rem;font-size:var(--text-sm);font-weight:var(--font-semibold);line-height:1;border:1px solid transparent;border-radius:var(--radius-sm);cursor:pointer;text-decoration:none;white-space:nowrap;transition:background-color var(--transition-fast),border-color var(--transition-fast),color var(--transition-fast),box-shadow var(--transition-fast)}.btn:disabled,.btn[aria-disabled=true]{opacity:.5;cursor:not-allowed;pointer-events:none}.btn-sm{padding:.375rem .75rem;font-size:var(--text-xs);border-radius:var(--radius-sm)}.btn-lg{padding:.75rem 1.5rem;font-size:var(--text-base);border-radius:var(--radius-md)}.btn-primary{background:var(--color-teacher-500);border-color:var(--color-teacher-500);color:var(--color-white);box-shadow:0 1px 2px #4f46e533}.btn-primary:hover{background:var(--color-teacher-600);border-color:var(--color-teacher-600);box-shadow:0 2px 8px #4f46e540}.btn-primary-student{background:var(--color-student-500);border-color:var(--color-student-500);color:var(--color-white);box-shadow:0 1px 2px #0d948833}.btn-primary-student:hover{background:var(--color-student-600);border-color:var(--color-student-600);box-shadow:0 2px 8px #0d948840}.btn-secondary{background:var(--color-white);border-color:var(--color-gray-300);color:var(--color-gray-700)}.btn-secondary:hover{background:var(--color-gray-50);border-color:var(--color-gray-400);color:var(--color-gray-800)}.btn-ghost{background:transparent;border-color:transparent;color:var(--color-gray-600)}.btn-ghost:hover{background:var(--color-gray-100);color:var(--color-gray-800)}.btn-danger{background:var(--color-white);border-color:var(--color-error-500);color:var(--color-error-700)}.btn-danger:hover{background:var(--color-error-100);border-color:var(--color-error-700)}.btn-danger-filled{background:var(--color-error-500);border-color:var(--color-error-500);color:var(--color-white)}.btn-danger-filled:hover{background:var(--color-error-700);border-color:var(--color-error-700)}.math-inline .katex{font-size:1.03em}.math-display-inline{display:block;max-width:100%;overflow-x:auto;overflow-y:hidden;padding:.125rem 0}.math-display-inline .katex-display{margin:.25rem 0}.btn-success{background:var(--color-success-500);border-color:var(--color-success-500);color:var(--color-white)}.btn-success:hover{background:var(--color-success-700);border-color:var(--color-success-700)}.btn-icon{padding:.5rem;border-radius:var(--radius-sm)}.card{background:var(--color-white);border:1px solid var(--color-gray-200);border-radius:var(--radius-md);box-shadow:var(--shadow-card)}.card-hover{transition:box-shadow var(--transition-base),transform var(--transition-base)}.card-hover:hover{box-shadow:var(--shadow-md);transform:translateY(-1px)}.card-body{padding:var(--space-5)}.card-header{padding:var(--space-4) var(--space-5);border-bottom:1px solid var(--color-gray-100);display:flex;align-items:center;justify-content:space-between;gap:var(--space-3)}.card-footer{padding:var(--space-4) var(--space-5);border-top:1px solid var(--color-gray-100);background:var(--color-gray-50);border-radius:0 0 var(--radius-md) var(--radius-md)}.card-accented{border-top:4px solid var(--color-teacher-500)}.card-accented--student{border-top-color:var(--color-student-500)}.card-accented--success{border-top-color:var(--color-success-500)}.card-accented--warning{border-top-color:var(--color-warning-500)}.stat-card{text-align:center}.stat-card .stat-value{font-size:var(--text-3xl);font-weight:var(--font-bold);color:var(--color-gray-900);line-height:1}.stat-card .stat-label{margin-top:var(--space-2);font-size:var(--text-sm);color:var(--color-gray-500)}.stat-card .stat-delta{margin-top:var(--space-1);font-size:var(--text-xs);font-weight:var(--font-medium)}.stat-card .stat-delta--up{color:var(--color-success-700)}.stat-card .stat-delta--down{color:var(--color-error-700)}.badge{display:inline-flex;align-items:center;gap:.3rem;padding:.25rem .6rem;font-size:var(--text-xs);font-weight:var(--font-semibold);line-height:1;border-radius:var(--radius-full);white-space:nowrap;letter-spacing:.01em}.badge-success{background:var(--color-success-100);color:var(--color-success-700)}.badge-warning{background:var(--color-warning-100);color:var(--color-warning-700)}.badge-error{background:var(--color-error-100);color:var(--color-error-700)}.badge-info{background:var(--color-info-100);color:var(--color-info-700)}.badge-neutral{background:var(--color-gray-100);color:var(--color-gray-600)}.badge-teacher{background:var(--color-teacher-100);color:var(--color-teacher-600)}.badge-student{background:var(--color-student-100);color:var(--color-student-600)}.badge:before{content:"";display:block;width:6px;height:6px;border-radius:var(--radius-full);background:currentColor;flex-shrink:0}.badge-nodot:before{display:none}.field{display:flex;flex-direction:column;gap:var(--space-1)}.field-label{font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-gray-700)}.field-hint{font-size:var(--text-xs);color:var(--color-gray-500)}.field-error{font-size:var(--text-xs);color:var(--color-error-700);display:flex;align-items:center;gap:var(--space-1)}.input,.textarea,.select{width:100%;padding:.5rem .75rem;font-size:var(--text-sm);font-family:var(--font-family);color:var(--color-gray-800);background:var(--color-white);border:1px solid var(--color-gray-300);border-radius:var(--radius-sm);transition:border-color var(--transition-fast),box-shadow var(--transition-fast);-moz-appearance:none;appearance:none;-webkit-appearance:none}.input:focus,.textarea:focus,.select:focus{outline:none;border-color:var(--color-teacher-500);box-shadow:0 0 0 3px #4f46e51f}.input--error,.textarea--error,.select--error{border-color:var(--color-error-500)}.input--error:focus,.textarea--error:focus,.select--error:focus{box-shadow:0 0 0 3px #ef44441f}.input::placeholder,.textarea::placeholder{color:var(--color-gray-400)}.textarea{resize:vertical;min-height:100px;line-height:var(--leading-relaxed)}.select{padding-right:2.25rem;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .75rem center;cursor:pointer}.input-lg{padding:.75rem 1rem;font-size:var(--text-base);border-radius:var(--radius-md);min-height:120px}.input-group{position:relative}.input-group .input{padding-left:2.5rem}.input-group__icon{position:absolute;left:.75rem;top:50%;transform:translateY(-50%);color:var(--color-gray-400);pointer-events:none;display:flex}.checkbox-field{display:flex;align-items:center;gap:var(--space-2);cursor:pointer}.checkbox-field input[type=checkbox],.checkbox-field input[type=radio]{width:1rem;height:1rem;accent-color:var(--color-teacher-500);cursor:pointer;flex-shrink:0}.checkbox-field .field-label{margin:0;cursor:pointer;-webkit-user-select:none;user-select:none}.toggle{position:relative;display:inline-flex;align-items:center;gap:var(--space-3);cursor:pointer}.toggle input[type=checkbox]{position:absolute;width:0;height:0;opacity:0}.toggle__track{width:40px;height:22px;border-radius:var(--radius-full);background:var(--color-gray-300);position:relative;transition:background var(--transition-fast);flex-shrink:0}.toggle__track:after{content:"";position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:var(--radius-full);background:var(--color-white);box-shadow:var(--shadow-sm);transition:transform var(--transition-fast)}.toggle input:checked+.toggle__track{background:var(--color-teacher-500)}.toggle input:checked+.toggle__track:after{transform:translate(18px)}.toggle__label{font-size:var(--text-sm);color:var(--color-gray-700);-webkit-user-select:none;user-select:none}.spinner{display:inline-block;width:1.25rem;height:1.25rem;border:2px solid var(--color-gray-200);border-top-color:var(--color-teacher-500);border-radius:var(--radius-full);animation:spin .65s linear infinite;flex-shrink:0}.spinner--sm{width:1rem;height:1rem}.spinner--lg{width:2rem;height:2rem;border-width:3px}.spinner--student{border-top-color:var(--color-student-500)}.page-loading{display:flex;align-items:center;justify-content:center;min-height:240px;gap:var(--space-3);color:var(--color-gray-500);font-size:var(--text-sm)}.tab-bar{display:flex;align-items:center;gap:0;border-bottom:1px solid var(--color-gray-200);margin-bottom:var(--space-6)}.tab-item{padding:var(--space-3) var(--space-4);font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-gray-500);background:transparent;border:none;border-bottom:2px solid transparent;margin-bottom:-1px;cursor:pointer;white-space:nowrap;transition:color var(--transition-fast),border-color var(--transition-fast)}.tab-item:hover{color:var(--color-gray-700);background:var(--color-gray-50)}.tab-item--active{color:var(--color-teacher-500);border-bottom-color:var(--color-teacher-500);font-weight:var(--font-semibold)}.tab-item--student.tab-item--active{color:var(--color-student-500);border-bottom-color:var(--color-student-500)}.tab-bar--pills{border-bottom:none;margin-bottom:var(--space-5);background:var(--color-gray-100);padding:3px;border-radius:var(--radius-md);gap:2px;display:inline-flex}.tab-bar--pills .tab-item{border-bottom:none;border-radius:calc(var(--radius-md) - 3px);padding:var(--space-2) var(--space-4);margin-bottom:0}.tab-bar--pills .tab-item--active{background:var(--color-white);color:var(--color-gray-800);box-shadow:var(--shadow-sm)}.divider{border:none;border-top:1px solid var(--color-gray-200);margin:var(--space-5) 0}.divider--label{position:relative;text-align:center}.divider--label:before{content:"";position:absolute;top:50%;left:0;right:0;border-top:1px solid var(--color-gray-200)}.divider__text{position:relative;display:inline-block;padding:0 var(--space-3);background:var(--color-white);font-size:var(--text-xs);color:var(--color-gray-400)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:var(--space-12) var(--space-6);color:var(--color-gray-500)}.empty-state__icon{font-size:2.5rem;margin-bottom:var(--space-4);opacity:.6}.empty-state__title{font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--color-gray-700);margin-bottom:var(--space-2)}.empty-state__description{font-size:var(--text-sm);color:var(--color-gray-500);max-width:380px;line-height:var(--leading-relaxed);margin-bottom:var(--space-5)}.alert{display:flex;align-items:flex-start;gap:var(--space-3);padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);font-size:var(--text-sm);line-height:var(--leading-relaxed)}.alert--info{background:var(--color-info-100);color:var(--color-info-700);border:1px solid rgba(59,130,246,.25)}.alert--success{background:var(--color-success-100);color:var(--color-success-700);border:1px solid rgba(34,197,94,.25)}.alert--warning{background:var(--color-warning-100);color:var(--color-warning-700);border:1px solid rgba(245,158,11,.25)}.alert--error{background:var(--color-error-100);color:var(--color-error-700);border:1px solid rgba(239,68,68,.25)}.alert__icon{flex-shrink:0;margin-top:1px}.alert__body{flex:1}.alert__title{font-weight:var(--font-semibold);margin-bottom:var(--space-1)}.alert__close{background:none;border:none;cursor:pointer;color:currentColor;opacity:.6;padding:0;line-height:1;font-size:var(--text-lg)}.alert__close:hover{opacity:1}.avatar{display:inline-flex;align-items:center;justify-content:center;border-radius:var(--radius-full);background:var(--color-teacher-100);color:var(--color-teacher-600);font-weight:var(--font-bold);font-size:var(--text-sm);flex-shrink:0;overflow:hidden;width:2rem;height:2rem}.avatar--sm{width:1.75rem;height:1.75rem;font-size:var(--text-xs)}.avatar--lg{width:2.5rem;height:2.5rem;font-size:var(--text-base)}.avatar--xl{width:3.5rem;height:3.5rem;font-size:var(--text-xl)}.avatar img{width:100%;height:100%;object-fit:cover}.progress-bar{width:100%;height:8px;background:var(--color-gray-200);border-radius:var(--radius-full);overflow:hidden}.progress-bar__fill{height:100%;border-radius:var(--radius-full);background:var(--color-teacher-500);transition:width .4s ease}.progress-bar__fill--student{background:var(--color-student-500)}.progress-bar__fill--success{background:var(--color-success-500)}.progress-bar__fill--warning{background:var(--color-warning-500)}.progress-bar__fill--error{background:var(--color-error-500)}.progress-bar__fill--score-high{background:var(--color-success-500)}.progress-bar__fill--score-mid{background:var(--color-warning-500)}.progress-bar__fill--score-low{background:var(--color-error-500)}.accordion{border:1px solid var(--color-gray-200);border-radius:var(--radius-md);overflow:hidden}.accordion+.accordion{margin-top:var(--space-2)}.accordion__trigger{width:100%;display:flex;align-items:center;justify-content:space-between;padding:var(--space-4) var(--space-5);background:var(--color-white);border:none;cursor:pointer;text-align:left;font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--color-gray-800);transition:background var(--transition-fast)}.accordion__trigger:hover{background:var(--color-gray-50)}.accordion__chevron{transition:transform var(--transition-base);color:var(--color-gray-400);flex-shrink:0}.accordion--open .accordion__chevron{transform:rotate(180deg)}.accordion__body{padding:0 var(--space-5) var(--space-5);font-size:var(--text-sm);color:var(--color-gray-600);border-top:1px solid var(--color-gray-100)}.score-cell{display:inline-flex;align-items:center;justify-content:center;min-width:2.5rem;padding:.25rem .5rem;font-size:var(--text-xs);font-weight:var(--font-bold);border-radius:var(--radius-sm)}.score-cell--high{background:var(--color-success-100);color:var(--color-success-700)}.score-cell--mid{background:var(--color-warning-100);color:var(--color-warning-700)}.score-cell--low{background:var(--color-error-100);color:var(--color-error-700)}.score-cell--empty{background:var(--color-gray-100);color:var(--color-gray-400)}.upload-zone{border:2px dashed var(--color-gray-300);border-radius:var(--radius-md);padding:var(--space-8) var(--space-6);text-align:center;cursor:pointer;color:var(--color-gray-500);background:var(--color-gray-50);transition:border-color var(--transition-fast),background var(--transition-fast)}.upload-zone:hover,.upload-zone--dragover{border-color:var(--color-teacher-500);background:var(--color-teacher-50);color:var(--color-teacher-600)}.upload-zone__icon{font-size:2rem;margin-bottom:var(--space-3);opacity:.7}.upload-zone__title{font-size:var(--text-sm);font-weight:var(--font-semibold);margin-bottom:var(--space-1)}.upload-zone__hint{font-size:var(--text-xs);color:var(--color-gray-400)}.copilot-panel{background:var(--color-white);border:1px solid var(--color-gray-200);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);overflow:hidden}.copilot-panel__header{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-4) var(--space-5);background:linear-gradient(135deg,var(--color-teacher-500),var(--color-teacher-600));color:var(--color-white)}.copilot-panel__title{font-size:var(--text-sm);font-weight:var(--font-bold);flex:1}.copilot-panel__beta{font-size:10px;font-weight:var(--font-bold);background:#fff3;padding:2px 6px;border-radius:var(--radius-full);letter-spacing:.06em;text-transform:uppercase}.copilot-panel__body{padding:var(--space-4) var(--space-5)}.copilot-panel__status{display:flex;align-items:center;gap:var(--space-2);font-size:var(--text-xs);color:var(--color-gray-500);padding:var(--space-2) 0}.copilot-panel__status--thinking .spinner{width:.875rem;height:.875rem}.hint-panel{background:var(--color-student-50);border:1px solid var(--color-student-100);border-radius:var(--radius-md);overflow:hidden;animation:slide-down var(--transition-base) ease both}.hint-item{padding:var(--space-3) var(--space-4);font-size:var(--text-sm);color:var(--color-gray-700);border-bottom:1px solid 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