:root{--blue:#2563eb;--blue-dark:#1d4ed8;--ink:#172033;--muted:#718096;--line:#e6eaf0;--bg:#f6f8fb;--card:#fff;--green:#16a36a;--orange:#d97706;--red:#dc2626;--shadow:0 8px 28px rgba(20,33,61,.06)}
*{box-sizing:border-box}body{margin:0;font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--bg);font-size:14px}button,input,select{font:inherit}button{cursor:pointer}.app-shell{max-width:1440px;margin:0 auto;min-height:100vh}.topbar{height:82px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 34px}.brand{display:flex;gap:12px;align-items:center}.brand-mark{width:38px;height:38px;display:grid;place-items:center;border-radius:11px;background:var(--blue);color:#fff;font-size:20px;font-weight:800;box-shadow:0 5px 13px rgba(37,99,235,.25)}.brand h1{font-size:17px;margin:0 0 3px;letter-spacing:.02em}.brand p{font-size:11px;color:var(--muted);margin:0}.top-actions,.heading-actions,.month-control{display:flex;align-items:center;gap:10px}.save-state{color:var(--green);font-size:12px;display:flex;gap:5px;align-items:center}.dot{width:7px;height:7px;border-radius:50%;background:var(--green)}main{padding:26px 34px 60px}.hero-card{background:linear-gradient(110deg,#1f57c8,#3979e9);border-radius:17px;padding:23px 28px;color:#fff;display:flex;justify-content:space-between;align-items:center;box-shadow:0 11px 27px rgba(37,99,235,.18)}.eyebrow{text-transform:uppercase;letter-spacing:.12em;color:#8da2c5;font-size:10px;font-weight:700}.hero-card .eyebrow{color:#cfe0ff}.month-control{margin-top:8px}.month-control input{border:0;background:transparent;color:#fff;font-weight:700;font-size:22px;padding:0 7px;width:155px;outline:0}.month-control input::-webkit-calendar-picker-indicator{filter:invert(1);opacity:.8}.icon-btn{border:0;background:rgba(255,255,255,.16);color:#fff;width:28px;height:28px;border-radius:7px;font-size:25px;line-height:20px}.hero-stats{display:flex;gap:42px;text-align:right}.hero-stats span{display:block;color:#dbe9ff;font-size:11px;margin-bottom:5px}.hero-stats strong{font-size:23px;letter-spacing:.02em}.tabbar{height:58px;display:flex;align-items:end;gap:28px;border-bottom:1px solid var(--line);margin-bottom:25px}.tab{height:45px;padding:0 2px;border:0;background:transparent;color:#8490a4;position:relative;font-weight:600}.tab.active{color:var(--blue)}.tab.active:after{content:"";height:2px;background:var(--blue);position:absolute;left:0;right:0;bottom:-1px;border-radius:2px}.view{display:none}.view.active{display:block}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:17px}.section-heading h2{margin:4px 0 5px;font-size:22px}.section-heading p{color:var(--muted);margin:0;font-size:12px}.date-field{display:flex;flex-direction:column;gap:5px;color:var(--muted);font-size:11px;font-weight:600}.date-field input{border:1px solid var(--line);padding:9px 11px;border-radius:8px;background:#fff;color:var(--ink)}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow)}.toolbar{padding:12px;display:flex;gap:10px;align-items:center;margin-bottom:14px}.search-field{height:37px;border:1px solid var(--line);display:flex;align-items:center;gap:7px;padding:0 11px;border-radius:8px;background:#fff;flex:1;max-width:320px;color:#9aa4b4}.search-field input{border:0;outline:0;width:100%;color:var(--ink);background:transparent}.select-field{color:var(--muted);font-size:12px;display:flex;align-items:center;gap:6px}.select-field select{border:1px solid var(--line);border-radius:8px;padding:9px 28px 9px 10px;background:#fff;color:var(--ink);outline:0}.primary-btn,.soft-btn,.ghost-btn,.danger-btn,.upload-btn{border:0;border-radius:8px;padding:10px 15px;font-weight:700;white-space:nowrap}.primary-btn{background:var(--blue);color:#fff;box-shadow:0 4px 10px rgba(37,99,235,.18)}.primary-btn:hover{background:var(--blue-dark)}.soft-btn{background:#edf3ff;color:var(--blue)}.ghost-btn{background:#fff;border:1px solid var(--line);color:#536075;padding:8px 12px}.student-picker{padding:5px 18px}.student-row{min-height:60px;border-bottom:1px solid #f0f2f5;display:flex;align-items:center;gap:12px}.student-row:last-child{border-bottom:0}.student-row input{width:18px;height:18px;accent-color:var(--blue)}.student-main{flex:1;display:flex;align-items:center;gap:12px}.avatar{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:#eaf1ff;color:var(--blue);font-weight:800}.student-name{font-weight:700}.student-grade{color:var(--muted);font-size:12px;margin-left:5px}.price-note{color:var(--muted);font-size:12px}.muted{color:var(--muted);font-size:12px}.subsection-heading{display:flex;align-items:center;gap:10px;margin:24px 0 10px}.subsection-heading h3{font-size:15px;margin:0}.table-card{overflow:hidden}.table-wrap{overflow:auto}.data-table{width:100%;border-collapse:collapse;min-width:680px}.data-table th{background:#fafbfc;color:#7a879b;text-align:left;font-size:11px;font-weight:700;white-space:nowrap}.data-table th,.data-table td{padding:13px 17px;border-bottom:1px solid #eef1f4}.data-table td{font-size:13px}.data-table th.right,.data-table td.right{text-align:right}.empty-cell{text-align:center;color:#a2aaba;padding:35px!important}.mini-btn{border:0;background:transparent;color:var(--blue);font-size:12px;margin-left:7px}.summary-table input{width:100px;padding:7px 8px;border:1px solid var(--line);border-radius:6px;text-align:right}.status-pill{display:inline-flex;padding:5px 8px;border-radius:20px;font-size:11px;font-weight:700}.status-paid{background:#e8f8f0;color:#118354}.status-partial{background:#fff5df;color:#bd6e00}.status-unpaid{background:#fff0f0;color:#c43e3e}.summary-table tfoot td{font-weight:800;background:#fafcff}.info-banner{background:#eef5ff;color:#41618f;border-radius:9px;padding:11px 13px;margin-bottom:14px;font-size:12px;display:flex;gap:9px;align-items:center}.info-icon{width:17px;height:17px;border-radius:50%;background:#7ea9ed;color:#fff;display:grid;place-items:center;font-size:11px;font-weight:800}.upload-btn{display:inline-flex;align-items:center;background:#edf3ff;color:var(--blue);cursor:pointer}.upload-btn input{display:none}.upload-btn.wide{width:100%;justify-content:center;margin-top:6px}.settings-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.setting-card{padding:20px}.setting-icon{width:37px;height:37px;border-radius:10px;display:grid;place-items:center;font-size:19px;font-weight:800;margin-bottom:13px}.setting-icon.blue{background:#eaf1ff;color:var(--blue)}.setting-icon.green{background:#e9f9f0;color:var(--green)}.setting-icon.purple{background:#f1ecff;color:#7957da}.setting-card h3,.danger-zone h3{margin:0 0 6px;font-size:15px}.setting-card p,.danger-zone p{font-size:12px;color:var(--muted);line-height:1.6;min-height:38px}.danger-zone{padding:18px 20px;margin-top:15px;display:flex;justify-content:space-between;align-items:center}.danger-zone p{margin:0;min-height:0}.danger-btn{color:var(--red);background:#fff0f0}.modal-backdrop{position:fixed;inset:0;background:rgba(21,31,50,.45);display:grid;place-items:center;z-index:20;padding:20px}.modal-backdrop[hidden]{display:none}.modal{background:#fff;border-radius:14px;width:min(430px,100%);padding:21px;box-shadow:0 20px 55px rgba(0,0,0,.2)}.modal-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.modal h3{margin:0;font-size:17px}.close-btn{border:0;background:transparent;font-size:25px;color:#96a0af}.modal form{display:grid;gap:12px}.modal label{color:#536075;font-size:12px;font-weight:600;display:grid;gap:6px}.modal input{border:1px solid var(--line);padding:10px;border-radius:8px;outline:0}.modal input:focus{border-color:#8eaff1}.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:7px}.modal-note{font-size:12px;color:var(--muted);line-height:1.6;margin-top:-4px}.toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,20px);opacity:0;background:#202a3a;color:#fff;padding:10px 17px;border-radius:8px;font-size:12px;z-index:40;transition:.2s;pointer-events:none}.toast.show{opacity:1;transform:translate(-50%,0)}@media(max-width:850px){.topbar{padding:0 17px}.top-actions .save-state{display:none}main{padding:18px 15px 45px}.hero-card{padding:18px;display:block}.hero-stats{margin-top:20px;justify-content:space-between;gap:12px;text-align:left}.hero-stats strong{font-size:18px}.tabbar{gap:17px;overflow:auto}.tab{white-space:nowrap}.section-heading{display:block}.heading-actions{margin-top:14px;justify-content:flex-end;flex-wrap:wrap}.toolbar{flex-wrap:wrap}.search-field{max-width:none;min-width:180px}.settings-grid{grid-template-columns:1fr}.danger-zone{display:block}.danger-zone button{margin-top:8px}}
@media print{body{background:#fff}.topbar,.tabbar,.section-heading .heading-actions,.toolbar,.hero-card{display:none!important}.app-shell,main{padding:0;max-width:none}.view{display:none!important}#summaryView{display:block!important}.summary-table{font-size:11px}.card{border:0;box-shadow:none}.table-card{overflow:visible}.data-table th,.data-table td{padding:7px 8px;border-color:#ccc}.summary-table input{border:0;padding:0}.section-heading{display:block;margin-bottom:10px}.section-heading h2{font-size:18px}.section-heading p{display:none}.print-meta{display:block;color:#444;font-size:11px;margin-top:5px}}
.print-meta{display:none}