:root{--background:#f7f8f6;--surface:#fff;--surface-muted:#f0f3ef;--line:#dfe5df;--text:#17211b;--muted:#657068;--primary:#217a53;--primary-strong:#155f40;--blue:#3a7ca5;--amber:#ba7a13;--coral:#c65f4c;--shadow:0 12px 40px #17211b14}*{box-sizing:border-box}html,body{background:var(--background);min-height:100%;color:var(--text);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.app-shell{grid-template-columns:248px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{border-right:1px solid var(--line);background:#ffffffc7;height:100vh;padding:22px 18px;position:sticky;top:0}.brand{align-items:center;gap:10px;margin-bottom:28px;font-size:20px;font-weight:750;display:flex}.brand-mark{background:var(--primary);color:#fff;border-radius:7px;place-items:center;width:30px;height:30px;font-weight:800;display:grid}.nav{gap:6px;display:grid}.nav a{color:var(--muted);border-radius:8px;align-items:center;gap:10px;padding:10px 11px;font-size:14px;display:flex}.nav a.active,.nav a:hover{background:var(--surface-muted);color:var(--text)}.main{min-width:0;padding:22px}.topbar{justify-content:space-between;align-items:center;gap:16px;margin-bottom:20px;display:flex}.eyebrow{color:var(--muted);margin:0 0 5px;font-size:13px}h1,h2,h3,p{margin-top:0}h1{letter-spacing:0;margin-bottom:0;font-size:30px;line-height:1.15}h2{margin-bottom:14px;font-size:18px}h3{margin-bottom:8px;font-size:15px}.button{background:var(--primary);color:#fff;cursor:pointer;border:0;border-radius:8px;justify-content:center;align-items:center;gap:8px;min-height:40px;padding:10px 14px;font-weight:650;display:inline-flex}.button.secondary{background:var(--surface);color:var(--text);border:1px solid var(--line)}.checkbox-label{align-items:flex-start;gap:9px;line-height:1.45;display:flex}.checkbox-label input{margin-top:3px}.checkbox-label a,.muted a{color:var(--primary-strong);font-weight:650}.button.warning{background:var(--amber)}.grid{gap:16px;display:grid}.dashboard-grid{grid-template-columns:1.4fr .9fr}.stats-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.card{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:8px;padding:18px}.legal-page{max-width:920px;margin:0 auto}.legal-card{padding:26px}.legal-copy{margin-top:24px;line-height:1.65}.legal-copy h2{margin-top:28px}.legal-copy ul{padding-left:20px}.legal-copy li{margin:8px 0}.legal-copy a,.legal-footer a{color:var(--primary-strong);font-weight:650}.legal-footer{color:var(--muted);flex-wrap:wrap;justify-content:center;gap:18px;padding:28px 0 8px;font-size:13px;display:flex}.stat{min-height:100px}.stat-value{font-size:28px;font-weight:760}.stat-label{color:var(--muted);font-size:13px}.status{background:var(--surface-muted);color:var(--muted);border-radius:999px;align-items:center;padding:4px 8px;font-size:12px;font-weight:650;display:inline-flex}.status.paid,.status.completed{color:#17613e;background:#dff2e8}.status.unpaid,.status.warning{color:#86590e;background:#fff0d6}.status.rescheduled{color:#225a7b;background:#e2eef7}.table{border-collapse:collapse;width:100%}.table th,.table td{text-align:left;border-bottom:1px solid var(--line);vertical-align:middle;padding:11px 8px;font-size:14px}.table th{color:var(--muted);font-size:12px;font-weight:700}.agenda{gap:10px;display:grid}.agenda-item{border:1px solid var(--line);border-radius:8px;grid-template-columns:78px minmax(0,1fr) auto;align-items:center;gap:12px;padding:12px;display:grid}.agenda-item.parent-lesson{grid-template-columns:48px minmax(0,1fr) auto}.slot-list{flex-wrap:wrap;grid-column:1/-1;gap:8px;display:flex}.slot-list.compact{margin-top:8px}.slot-list.compact .button{min-height:32px;padding:6px 8px;font-size:12px}.term-band{background:var(--surface-muted);border-radius:8px;justify-content:space-between;gap:12px;padding:10px 12px;font-size:14px;display:flex}.empty,.notice{gap:8px;display:grid}.notice{grid-template-columns:auto 1fr;align-items:center;margin-bottom:16px}.muted{color:var(--muted)}.form{gap:13px;display:grid}.field{gap:6px;display:grid}.field label{color:var(--muted);font-size:13px;font-weight:650}.field input,.field select,.field textarea{border:1px solid var(--line);background:#fff;border-radius:8px;min-height:40px;padding:9px 10px}.check-list{border:1px solid var(--line);background:#fff;border-radius:8px;gap:8px;padding:10px;display:grid}.calendar{border:1px solid var(--line);border-radius:8px;grid-template-columns:repeat(7,minmax(120px,1fr));display:grid;overflow:hidden}.day{border-right:1px solid var(--line);background:#fbfcfb;min-height:220px}.day:last-child{border-right:0}.day-head{border-bottom:1px solid var(--line);color:var(--muted);padding:10px;font-size:12px;font-weight:750}.lesson-block{border-left:3px solid var(--primary);background:#fff;border-radius:7px;margin:8px;padding:9px;font-size:13px;box-shadow:0 2px 10px #17211b0f}.lesson-block.rescheduled{border-color:var(--blue)}.mobile-only{display:none}@media (max-width:900px){.app-shell{display:block}.sidebar{border-right:0;border-bottom:1px solid var(--line);height:auto;position:static}.nav{grid-template-columns:repeat(4,minmax(0,1fr))}.nav a{justify-content:center}.dashboard-grid,.stats-grid{grid-template-columns:1fr}.desktop-only{display:none}.mobile-only{display:block}.main{padding:16px}.topbar{flex-direction:column;align-items:flex-start}.agenda-item{grid-template-columns:64px minmax(0,1fr)}}