:root{--navy:#0f3d6e;--navy2:#174f8c;--bg:#f2f5f9;--card:#fff;--text:#1d2a3a;--muted:#6b7b8b;--line:#e3e9ef;--green:#13804a;--red:#c0392b;--amber:#b9770e;--radius:12px}
*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--text);font:16px/1.4 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;-webkit-text-size-adjust:100%}
a{color:var(--navy2);text-decoration:none}
header.top{position:sticky;top:0;z-index:5;background:var(--navy);color:#fff;padding:calc(env(safe-area-inset-top) + 10px) 16px 10px;display:flex;align-items:center;gap:10px}
header.top img{height:32px;border-radius:6px;background:#fff}header.top h1{font-size:17px;margin:0;flex:1}header.top button{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.4);border-radius:8px;padding:6px 10px;font:inherit;font-size:14px}
main{max-width:900px;margin:0 auto;padding:14px 14px calc(90px + env(safe-area-inset-bottom))}
nav.tabs{position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);display:flex;justify-content:space-around;padding:6px 4px calc(6px + env(safe-area-inset-bottom));z-index:6}
nav.tabs a{flex:1;text-align:center;font-size:11px;color:var(--muted);padding:4px 0;position:relative}nav.tabs a .ic{display:block;font-size:20px;line-height:24px}nav.tabs a.on{color:var(--navy)}nav.tabs .badge{position:absolute;top:0;left:55%;background:var(--red);color:#fff;border-radius:9px;font-size:10px;padding:1px 5px}
@media(min-width:900px){nav.tabs{top:58px;bottom:auto;left:0;right:auto;width:110px;flex-direction:column;justify-content:flex-start;border:0;border-right:1px solid var(--line);height:100vh;padding-top:12px}nav.tabs a{flex:0;padding:12px 0}main{padding-left:130px;max-width:1040px}}
h2{font-size:20px;margin:6px 0 12px}h3{font-size:16px;margin:18px 0 8px}
.card{background:var(--card);border-radius:var(--radius);padding:14px;margin-bottom:12px;box-shadow:0 1px 3px rgba(15,61,110,.06)}
.row{display:flex;gap:10px;align-items:center}.row.wrap{flex-wrap:wrap}.grow{flex:1;min-width:0}.right{text-align:right}.center{text-align:center;padding:40px}
.muted{color:var(--muted)}.small{font-size:13px}.big{font-size:22px;font-weight:700}.bold{font-weight:600}
.list .item{display:flex;align-items:center;gap:10px;padding:12px 2px;border-bottom:1px solid var(--line);color:inherit}.list .item:last-child{border-bottom:0}
.pill{display:inline-block;font-size:12px;padding:2px 8px;border-radius:20px;background:#e8eef5;color:var(--navy);white-space:nowrap}
.pill.draft{background:#eef0f2;color:#5d6d7e}.pill.sent{background:#fff4e0;color:var(--amber)}.pill.overdue{background:#fde8e6;color:var(--red)}.pill.paid,.pill.confirmed{background:#e3f5ea;color:var(--green)}.pill.void,.pill.declined{background:#eee;color:#888}.pill.submitted{background:#e6f0fb;color:var(--navy2)}.pill.invoiced{background:#fff4e0;color:var(--amber)}.pill.example{background:#fff1c2;color:#7a5a00}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:0;border-radius:10px;background:var(--navy);color:#fff;font:inherit;font-weight:600;padding:11px 16px;min-height:44px;cursor:pointer}
.btn.sec{background:#e8eef5;color:var(--navy)}.btn.ok{background:var(--green)}.btn.warn{background:var(--red)}.btn.sm{padding:7px 12px;min-height:34px;font-size:14px}.btn.block{width:100%}.btn:disabled{opacity:.5}
.btns{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
label{display:block;font-size:13px;color:var(--muted);margin:10px 0 4px}
input,select,textarea{width:100%;font:inherit;font-size:16px;padding:10px 12px;border:1px solid #cfd8e2;border-radius:10px;background:#fff;color:var(--text)}textarea{min-height:90px}
input[type=checkbox]{width:auto;transform:scale(1.25);margin-right:8px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 12px}.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:0 12px}@media(max-width:560px){.grid3{grid-template-columns:1fr 1fr}}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin-bottom:12px}.stats .card{margin:0}
.lesson{display:flex;align-items:center;gap:10px;padding:10px 4px;border-bottom:1px solid var(--line);cursor:pointer}.lesson .d{width:92px;font-size:14px}.lesson.past .d{color:var(--muted)}
.st{font-size:12px;padding:2px 8px;border-radius:12px;background:#eef2f6}.st.attended{background:#e3f5ea;color:var(--green)}.st.absent_makeup{background:#e6f0fb;color:var(--navy2)}.st.absent_credit,.st.cancelled{background:#f0f0f0;color:#777}.st.late_cancel{background:#fff4e0;color:var(--amber)}.st.forfeit{background:#fde8e6;color:var(--red)}.st.makeup{background:#efe6fb;color:#6c3fb5}
.blockhdr{font-size:12px;color:var(--muted);padding:10px 4px 2px;text-transform:uppercase;letter-spacing:.5px}
table.lines{width:100%;border-collapse:collapse;font-size:14px}table.lines td{padding:6px 2px;border-bottom:1px solid var(--line)}table.lines td.num{text-align:right;white-space:nowrap}
.sheet{position:fixed;inset:0;z-index:20}.sheet.hidden{display:none}.sheet-bg{position:absolute;inset:0;background:rgba(0,0,0,.35)}.sheet-body{position:absolute;left:0;right:0;bottom:0;max-height:88vh;overflow:auto;background:#fff;border-radius:16px 16px 0 0;padding:16px 16px calc(20px + env(safe-area-inset-bottom))}
@media(min-width:700px){.sheet-body{left:50%;width:560px;transform:translateX(-50%);bottom:auto;top:8vh;border-radius:16px}}
.opt{display:block;width:100%;text-align:left;background:#f4f7fa;border:0;border-radius:10px;padding:12px;margin:6px 0;font:inherit;color:var(--text);cursor:pointer}.opt b{display:block}.opt span{font-size:13px;color:var(--muted)}
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%);background:#1d2a3a;color:#fff;padding:10px 16px;border-radius:10px;z-index:30;max-width:90vw;font-size:14px}.toast.hidden{display:none}.toast.err{background:var(--red)}
.login{max-width:360px;margin:12vh auto;text-align:center}.login img{width:140px;border-radius:12px;margin-bottom:12px}
iframe.inv{width:100%;height:75vh;border:1px solid var(--line);border-radius:10px;background:#fff}
.note{background:#fff8e1;border-radius:10px;padding:10px 12px;font-size:14px;margin:8px 0}
.kv{display:grid;grid-template-columns:140px 1fr;gap:4px 10px;font-size:14px}.kv div:nth-child(odd){color:var(--muted)}
table.sgrid{border-collapse:separate;border-spacing:3px;font-size:13px}table.sgrid th{color:var(--muted);font-weight:600;padding:2px 4px;white-space:nowrap}table.sgrid td{vertical-align:top;min-width:46px}
.chip{display:block;width:100%;margin:2px 0;border:1px solid #cfd8e2;background:#fff;border-radius:8px;padding:6px 2px;font:inherit;font-size:12px;font-weight:700;color:var(--navy);cursor:pointer;line-height:1.1}
.chip.private{color:#6c3fb5;border-color:#d9c8f2}.chip small{display:block;font-weight:400;font-size:10px;color:var(--muted)}
.chip.on{background:var(--navy);color:#fff;border-color:var(--navy)}.chip.private.on{background:#6c3fb5;border-color:#6c3fb5}.chip.on small{color:#dfe8f3}
.chip.full{border-color:var(--red);background:#fdecea}.chip.full small{color:var(--red)}
.selrow{border-bottom:1px solid var(--line);padding:8px 0}