:root{--ink:#17211d;--muted:#68746d;--line:#dfe5e1;--surface:#fff;--canvas:#f6f8f6;--accent:#176d45;--accent-dark:#0e5534;--accent-soft:#e4f2e9;--danger:#b42318;--danger-soft:#fee9e7;--radius:10px;--shadow:0 8px 22px rgba(23,33,29,.06)}*{box-sizing:border-box}body{margin:0;background:var(--canvas);color:var(--ink);font:14px/1.45 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.topbar{height:64px;background:var(--surface);border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 max(24px,calc((100vw - 1280px)/2));gap:38px;position:sticky;top:0;z-index:3}.brand{color:var(--ink);text-decoration:none;font-size:16px;white-space:nowrap}.brand b{color:var(--accent)}.brand-mark{display:inline-grid;place-items:center;width:27px;height:27px;border-radius:8px;background:var(--accent);color:white;font-weight:800;margin-right:6px}.brand.large{font-size:19px}.brand.large .brand-mark{width:35px;height:35px;font-size:17px}nav{display:flex;align-self:stretch;gap:6px}nav a{display:flex;align-items:center;padding:0 10px;color:var(--muted);text-decoration:none;border-bottom:2px solid transparent}nav a[aria-current=page]{color:var(--accent);border-color:var(--accent);font-weight:650}.account{margin-left:auto;display:flex;align-items:center;gap:12px}.account span{display:grid;text-align:right;font-size:13px}.account small{color:var(--muted);text-transform:capitalize}.account form{margin:0}.shell{max-width:1280px;margin:0 auto;padding:36px 24px 52px}.auth-shell{min-height:100vh;display:grid;place-items:center;padding:24px}.auth-card,.form-card,.table-card,.info-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.auth-card{width:min(100%,420px);padding:38px}.auth-card h1{font-size:24px;margin:28px 0 4px}.auth-card 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.search{min-width:0}.filters .button{width:100%}.detail-grid,.users-layout{grid-template-columns:1fr}.two-col{grid-template-columns:1fr}.wide{grid-column:auto}.form-actions{justify-content:stretch}.form-actions .button{flex:1}.course-actions{min-width:110px}.auth-card{padding:28px 22px}}