:root{color-scheme:light}*{box-sizing:border-box}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,Apple Color Emoji,Segoe UI Emoji}body.impersonation-body{background:#f0fdf4}a{color:inherit}.container{max-width:960px;margin:0 auto;padding:24px}.card{border:1px solid #e5e7eb;border-radius:16px;padding:16px}.row{display:flex;gap:12px;flex-wrap:wrap}input:not([type=checkbox]):not([type=radio]),textarea{width:100%;padding:10px 12px;border:1px solid #d1d5db;border-radius:12px;font-size:14px}input[type=checkbox],input[type=radio]{width:auto;padding:0}button{padding:10px 14px;border-radius:12px;border:1px solid #d1d5db;background:#111827;color:#fff;cursor:pointer}button.secondary{background:#fff;color:#111827}button.nav-pill{transition:background-color .14s ease,border-color .14s ease,color .14s ease}button.nav-pill.secondary:focus-visible,button.nav-pill.secondary:hover{background:#f3f4f6;border-color:#d1d5db}button.nav-pill.secondary.nav-pill-admin{border:2px solid #dc2626;box-sizing:border-box;color:#111827;font-weight:700;background:#fff}button.nav-pill.secondary.nav-pill-admin.nav-pill-admin-active{background:#fef2f2}button.nav-pill.secondary.nav-pill-admin:focus-visible,button.nav-pill.secondary.nav-pill-admin:hover{background:#fce7f3;border-color:#dc2626}label.publish-test-toggle{background:#fff}label.publish-test-toggle:not(.publish-test-toggle-disabled):hover{background:#f3f4f6}label.publish-test-toggle:not(.publish-test-toggle-disabled):focus-within{background:#f3f4f6}.readings-panel-edit-grid a{display:block;width:100%;min-width:0}.readings-panel-edit-grid .card-action{width:100%;box-sizing:border-box}.readings-panel-edit-grid button.card-action{padding:6px 10px!important;font-size:10px!important;line-height:1.25!important;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}button.card-action{transition:background-color .14s ease,border-color .14s ease,color .14s ease}button.card-action.secondary:focus-visible,button.card-action.secondary:hover{background:#f3f4f6;border-color:#d1d5db}button.card-action.card-action-danger{border-color:#c1121f;color:#c1121f;background:transparent}button.card-action.card-action-danger:focus-visible,button.card-action.card-action-danger:hover{background:#fdf2f8}.account-menu-item{text-decoration:none}.account-menu-item:focus-visible,.account-menu-item:hover{text-decoration:underline}button.home-login-resend.secondary{transition:background-color .14s ease,border-color .14s ease}button.home-login-resend.secondary:focus-visible:not(:disabled),button.home-login-resend.secondary:hover:not(:disabled){background:#f3f4f6;border-color:#d1d5db}small.muted{color:#6b7280}hr{border:0;border-top:1px solid #e5e7eb;margin:16px 0}.chat{display:flex;flex-direction:column;gap:10px}.bubble{padding:10px 12px;border-radius:14px;max-width:85%;white-space:pre-wrap}.bubble.student{align-self:flex-end;background:#111827;color:#fff}.bubble.assistant{align-self:flex-start;background:#f3f4f6}.bubble.assistant.thinking-placeholder{width:85%;max-width:85%;box-sizing:border-box;min-height:44px}.bubble.assistant.thinking-placeholder .spinner{border-color:#2563eb rgba(37,99,235,.22) rgba(37,99,235,.22)}.bubble.student.feedback-answer-hover:focus-visible,.bubble.student.feedback-answer-hover:hover{color:#fde047}.spinner{width:16px;height:16px;border-radius:999px;border:2px solid hsla(220,9%,46%,.35);border-top-color:hsla(220,9%,46%,.95);animation:spin .8s linear infinite;flex-shrink:0}.spinner.spinner-danger{border-color:#dc2626 rgba(220,38,38,.22) rgba(220,38,38,.22)}@keyframes spin{to{transform:rotate(1turn)}}.button-library-cta-link{display:block;width:min(300px,100%)}button.button-muted-cta{background:#e5e7eb;color:#111827;border-color:#d1d5db}button.button-muted-cta:hover{background:#111827;color:#fff;border-color:#111827}button.button-library-cta{width:100%;display:inline-flex;justify-content:center;background:#eff6ff;color:#1e3a8a;border-color:#1d4ed8}button.button-library-cta:focus-visible,button.button-library-cta:hover{background:#dbeafe;border-color:#1d4ed8}.impersonation-banner{position:-webkit-sticky;position:sticky;top:0;z-index:50;background:#dcfce7;border-bottom:1px solid #86efac}.impersonation-banner__inner{max-width:960px;margin:0 auto;padding:12px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.impersonation-banner__title{font-weight:800;color:#14532d}.impersonation-banner__meta{display:block;color:#166534}.impersonation-banner__button{border-color:#16a34a;color:#166534;background:#f0fdf4}.impersonation-modal-backdrop{position:fixed;inset:0;background:rgba(17,24,39,.38);display:grid;place-items:center;padding:24px;z-index:60}.impersonation-modal{width:min(480px,100%);background:#fff;border:1px solid #86efac;border-radius:18px;padding:20px;box-shadow:0 20px 50px rgba(0,0,0,.18)}