:root{--bg: #f4f5f7;--surface: #ffffff;--text: #1a1d23;--text-muted: #6b7280;--border: #e2e4e9;--primary: #2563eb;--primary-dark: #1d4ed8;--unpaid: #b45309;--unpaid-bg: #fef3c7;--paid: #15803d;--paid-bg: #dcfce7;--disputed: #b91c1c;--disputed-bg: #fee2e2;--radius: 12px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.page{min-height:100vh;padding:20px 16px 48px;max-width:640px;margin:0 auto}.page-center{display:flex;align-items:center;justify-content:center}.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;gap:12px}.app-title{font-size:22px;font-weight:700;margin:0;word-break:break-word}.app-subtitle{color:var(--text-muted);margin:4px 0 24px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.search-card{width:100%;max-width:420px}.search-form{display:flex;flex-direction:column;gap:10px;margin-top:8px}.field-label{font-size:13px;font-weight:600;color:var(--text-muted)}.text-input{padding:12px 14px;border:1px solid var(--border);border-radius:8px;font-size:16px;text-transform:uppercase}.text-input:focus{outline:2px solid var(--primary);outline-offset:1px}.btn{padding:12px 16px;border-radius:8px;font-size:15px;font-weight:600;border:none;cursor:pointer;text-align:center;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;min-height:44px}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-secondary{background:var(--surface);color:var(--text);border:1px solid var(--border)}.btn-full{width:100%;margin-top:16px}.helper-text{font-size:13px;color:var(--text-muted);margin-top:16px}.challan-list{display:flex;flex-direction:column;gap:12px}.challan-card{display:flex;align-items:center;justify-content:space-between;gap:12px;color:inherit;transition:border-color .15s}.challan-card:hover{border-color:var(--primary)}.challan-card-main{display:flex;flex-direction:column;gap:4px;min-width:0}.challan-card-title{font-weight:600;font-size:16px}.challan-card-date{font-size:13px;color:var(--text-muted)}.challan-card-side{display:flex;flex-direction:column;align-items:flex-end;gap:6px;flex-shrink:0}.challan-card-amount{font-weight:700}.badge{display:inline-block;padding:4px 10px;border-radius:999px;font-size:12px;font-weight:700}.badge-unpaid{color:var(--unpaid);background:var(--unpaid-bg)}.badge-paid{color:var(--paid);background:var(--paid-bg)}.badge-disputed{color:var(--disputed);background:var(--disputed-bg)}.empty-state{text-align:center;color:var(--text-muted)}.detail-card{display:flex;flex-direction:column}.detail-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.detail-fields{margin:0}.detail-row{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid var(--border)}.detail-row:last-child{border-bottom:none}.detail-row dt{color:var(--text-muted);font-size:13px}.detail-row dd{margin:0;font-weight:600;text-align:right}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;display:flex;align-items:center;justify-content:center;padding:16px;z-index:10}.modal-card{width:100%;max-width:360px;text-align:center}.modal-title{margin:0 0 8px;font-size:18px}.modal-success{color:var(--paid)}.modal-amount{font-size:28px;font-weight:700;margin:4px 0}.modal-actions{display:flex;gap:10px;margin-top:20px}.modal-actions .btn{flex:1}@media (min-width: 640px){.page{padding-top:40px}}