:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#193033;background:#f3f6f5;font-synthesis:none;text-rendering:optimizeLegibility;--ink: #193033;--muted: #6e7d7d;--line: #dbe4e1;--brand: #176d68;--brand-dark: #0f504d;--paper: #ffffff}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button,input,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}h1,h2,p{margin-top:0}h1{margin-bottom:0;font-size:clamp(1.75rem,4vw,2.45rem);letter-spacing:-.045em}h2{font-size:1.05rem;margin-bottom:18px}label{display:grid;gap:7px;color:#526463;font-size:.86rem;font-weight:650}input,select{width:100%;min-height:44px;border:1px solid #cfdad7;border-radius:10px;background:#fff;color:var(--ink);padding:0 12px;outline:none}input:focus,select:focus{border-color:var(--brand);box-shadow:0 0 0 3px #176d681f}.center-screen{min-height:100vh;display:grid;place-items:center}.spinner{width:38px;height:38px;border-radius:50%;border:3px solid #d6e3df;border-top-color:var(--brand);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.login-page{min-height:100vh;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at 15% 10%,#d8ece8 0,transparent 34%),linear-gradient(135deg,#f7faf9,#e8f0ee)}.login-card{width:min(100%,430px);padding:42px;background:#fffffff2;border:1px solid rgba(23,109,104,.16);border-radius:24px;box-shadow:0 28px 70px #123d3b21}.brand-mark{width:52px;height:52px;display:grid;place-items:center;border-radius:15px 15px 15px 5px;background:var(--brand);color:#fff;font-size:1.45rem;font-weight:800}.brand-mark.small{width:40px;height:40px;border-radius:11px 11px 11px 4px;font-size:1.1rem}.eyebrow{margin:25px 0 5px;color:var(--brand);font-size:.75rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.login-copy{color:var(--muted);line-height:1.55;margin:12px 0 26px}.stack{display:grid;gap:16px}.primary,.secondary,.ghost{min-height:42px;border-radius:10px;padding:0 16px;font-weight:750}.primary{border:1px solid var(--brand);background:var(--brand);color:#fff;box-shadow:0 8px 20px #176d682e}.primary:hover{background:var(--brand-dark)}.secondary{border:1px solid #b9cfca;background:#e8f3f0;color:var(--brand-dark)}.ghost{border:1px solid var(--line);background:#fff;color:#425655}.danger{color:#a93e3e}.error-banner{padding:11px 13px;border-radius:9px;background:#fff0f0;color:#a53030;font-size:.88rem}.app-shell{min-height:100vh}.topbar{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 max(20px,calc((100vw - 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24px,1180px);padding-top:24px}.page-heading{align-items:stretch;flex-direction:column}.filters{display:grid;grid-template-columns:1fr 1fr}.lesson-bar{align-items:stretch;flex-direction:column}.new-lesson{grid-template-columns:1fr 110px}.new-lesson button{grid-column:1 / -1}.summary-grid{grid-template-columns:1fr 1fr}.student-row{align-items:stretch;flex-direction:column;gap:10px}.student-name{min-width:0}.status-buttons{grid-template-columns:repeat(4,1fr)}.status-buttons button{min-width:0;padding:0 4px}.two-columns,.assign-form{grid-template-columns:1fr}}@media(max-width:430px){.login-card{padding:28px 22px}.filters{grid-template-columns:1fr}.compact-label{min-width:0}.status-buttons,.summary-grid{grid-template-columns:1fr 1fr}}
