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16px;border-radius:var(--radius-sm);background:var(--yellow-soft);border:1px solid #f3d98a;color:#6b4c00;margin-bottom:16px}.alert--error{background:var(--danger-soft);border-color:#efb5b2;color:#8f2c28}.alert--success{background:var(--accent-soft);border-color:#b7dcc6;color:var(--accent-dark)}.alert--info{background:var(--sky-soft);border-color:#b9dff2;color:#1f5f80}.auth{flex:1;display:flex;align-items:flex-start;justify-content:center;padding:24px 16px 48px}@media (min-width: 640px){.auth{padding-top:48px;align-items:center}}.auth__card{width:100%;max-width:440px;background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px 24px}@media (min-width: 640px){.auth__card{padding:36px}}.auth__card--wide{max-width:520px}.auth__brand{display:flex;align-items:center;gap:12px;margin-bottom:20px}.auth__brand img{height:44px;width:auto}.auth__brand h1{font-size:1.4rem;margin:0}.auth__brand small{display:block;font-size:.85rem;font-family:var(--font-sub);font-weight:600}.auth__links{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;margin-top:18px;font-size:.9rem}.auth__links a{text-decoration:none}.auth__links a:hover{text-decoration:underline}.demo-bar{background:var(--ink);color:var(--white);font-size:.8rem;padding:6px 16px;display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:8px 14px}.demo-bar select{font:inherit;font-size:.8rem;border-radius:999px;border:1px solid rgba(255,255,255,.4);background:#ffffff1a;color:var(--white);padding:2px 8px}.demo-bar select option{color:var(--ink)}.class-head .page-head{margin-bottom:0}.class-head__title{display:inline-flex;align-items:center;gap:10px}.class-head__title .color-dot{width:14px;height:14px}.class-head__meta{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0 10px}.class-head__teachers{color:var(--muted);font-size:.9rem;margin:0}.section{margin-bottom:28px}.section__head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.section__head h2{margin:0}.kv{display:grid;grid-template-columns:max-content 1fr;gap:6px 14px;font-size:.9rem}.kv dt{color:var(--muted)}.kv dd{margin:0}@keyframes spin{to{transform:rotate(360deg)}}@keyframes fade{0%{opacity:0}}@keyframes rise{0%{transform:translateY(12px);opacity:0}}@keyframes slide{0%{transform:translate(40px);opacity:0}}@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important}}