:root{--clr-primary: #0b6e6e;--clr-primary-dark: #084f4f;--clr-primary-lite: #e0f4f4;--clr-accent: #22c55e;--clr-danger: #ef4444;--clr-warn: #f59e0b;--clr-text: #1a1a1a;--clr-muted: #6b7280;--clr-border: #e2e8f0;--clr-bg: #f8fafc;--clr-white: #ffffff;--clr-sidebar-bg: #0b6e6e;--clr-sidebar-text: #cceee;--radius: 8px;--shadow: 0 1px 4px rgba(0,0,0,.08);--shadow-md: 0 4px 12px rgba(0,0,0,.1);--font: "Segoe UI", Arial, sans-serif}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;font-family:var(--font);font-size:15px;color:var(--clr-text);background:var(--clr-bg)}a{color:inherit;text-decoration:none}button{cursor:pointer;font-family:var(--font)}input,select,textarea{font-family:var(--font)}.app-shell{display:flex;height:100vh;overflow:hidden}.sidebar{width:240px;min-width:240px;background:var(--clr-sidebar-bg);color:#fff;display:flex;flex-direction:column;overflow-y:auto}.sidebar-logo{display:flex;align-items:center;gap:10px;padding:20px 20px 16px;font-size:18px;font-weight:700;letter-spacing:-.3px;border-bottom:1px solid rgba(255,255,255,.12)}.sidebar-logo .logo-icon{font-size:24px}.sidebar-nav{flex:1;padding:12px 0}.sidebar-nav a,.sidebar-nav button{display:flex;align-items:center;gap:10px;padding:10px 20px;width:100%;font-size:14px;color:#ffffffd9;background:none;border:none;text-align:left;border-radius:0;transition:background .15s}.sidebar-nav a:hover,.sidebar-nav button:hover{background:#ffffff1a;color:#fff}.sidebar-nav a.active{background:#ffffff2e;color:#fff;font-weight:600}.sidebar-nav .nav-icon{font-size:17px;width:22px;text-align:center}.sidebar-section{padding:6px 20px 2px;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:#ffffff73}.sidebar-footer{padding:12px 16px;border-top:1px solid rgba(255,255,255,.12)}.sidebar-user{display:flex;align-items:center;gap:10px;padding:8px;border-radius:var(--radius)}.sidebar-user 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var(--clr-border);font-weight:600;font-size:15px;display:flex;align-items:center;justify-content:space-between}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:24px}.stat-card{background:var(--clr-white);border:1px solid var(--clr-border);border-radius:var(--radius);padding:20px;display:flex;flex-direction:column;gap:6px}.stat-value{font-size:28px;font-weight:700;color:var(--clr-primary);line-height:1}.stat-label{font-size:13px;color:var(--clr-muted)}.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--radius);font-size:14px;font-weight:500;border:none;transition:opacity .15s,background .15s;line-height:1.4}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--clr-primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--clr-primary-dark)}.btn-secondary{background:var(--clr-bg);color:var(--clr-text);border:1px solid var(--clr-border)}.btn-secondary:hover:not(:disabled){background:var(--clr-border)}.btn-danger{background:var(--clr-danger);color:#fff}.btn-danger:hover:not(:disabled){background:#dc2626}.btn-ghost{background:transparent;color:var(--clr-primary);padding:6px 10px}.btn-ghost:hover{background:var(--clr-primary-lite)}.btn-sm{padding:5px 12px;font-size:13px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.form-grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px}.form-full{grid-column:1 / -1}.field{display:flex;flex-direction:column;gap:5px}.field label{font-size:13px;font-weight:500;color:var(--clr-muted)}.field input,.field select,.field textarea{padding:9px 12px;border:1px solid var(--clr-border);border-radius:var(--radius);font-size:14px;color:var(--clr-text);background:var(--clr-white);transition:border-color .15s;width:100%}.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--clr-primary);box-shadow:0 0 0 3px #0b6e6e1a}.field textarea{resize:vertical;min-height:80px}.field-error input,.field-error select{border-color:var(--clr-danger)}.field .error-msg{font-size:12px;color:var(--clr-danger)}.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--clr-border)}table{width:100%;border-collapse:collapse;background:var(--clr-white)}th{background:var(--clr-bg);padding:11px 16px;text-align:left;font-size:12px;font-weight:600;color:var(--clr-muted);text-transform:uppercase;letter-spacing:.05em;border-bottom:1px solid var(--clr-border);white-space:nowrap}td{padding:12px 16px;font-size:14px;border-bottom:1px solid var(--clr-border);vertical-align:middle}tr:last-child td{border-bottom:none}tbody tr:hover{background:var(--clr-bg)}.badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:600}.badge-green{background:#dcfce7;color:#166534}.badge-red{background:#fee2e2;color:#991b1b}.badge-yellow{background:#fef9c3;color:#854d0e}.badge-blue{background:#dbeafe;color:#1e40af}.badge-gray{background:#f3f4f6;color:#374151}.badge-teal{background:var(--clr-primary-lite);color:var(--clr-primary-dark)}.search-bar{position:relative}.search-bar input{padding-left:36px;min-width:260px}.search-bar .search-icon{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--clr-muted);font-size:15px}.alert{padding:12px 16px;border-radius:var(--radius);font-size:14px;margin-bottom:16px}.alert-error{background:#fee2e2;color:#991b1b;border:1px solid #fca5a5}.alert-success{background:#dcfce7;color:#166534;border:1px solid #86efac}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--clr-primary) 0%,#084f4f 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var(--clr-border);border-radius:var(--radius);padding:32px;max-width:720px}.invoice-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:28px;padding-bottom:20px;border-bottom:2px solid var(--clr-primary)}.invoice-clinic-name{font-size:22px;font-weight:700;color:var(--clr-primary)}.invoice-number{font-size:20px;font-weight:700;text-align:right}.invoice-meta{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:24px}.invoice-items table{margin-bottom:16px}.invoice-totals{display:flex;flex-direction:column;align-items:flex-end;gap:6px;margin-bottom:24px}.invoice-total-row{display:flex;gap:32px;font-size:14px}.invoice-total-row.grand{font-size:17px;font-weight:700;color:var(--clr-primary);padding-top:8px;border-top:2px solid var(--clr-border)}.invoice-footer{text-align:center;font-size:12px;color:var(--clr-muted);padding-top:16px;border-top:1px solid var(--clr-border)}.item-row{display:grid;grid-template-columns:1fr 80px 100px 100px 36px;gap:8px;align-items:end;margin-bottom:8px}.empty-state{text-align:center;padding:48px 24px;color:var(--clr-muted)}.empty-state .empty-icon{font-size:40px;margin-bottom:12px}.empty-state p{font-size:15px}.spinner{display:inline-block;width:22px;height:22px;border:3px solid var(--clr-border);border-top-color:var(--clr-primary);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-center{display:flex;justify-content:center;align-items:center;padding:64px}@media print{.sidebar,.page-header,.no-print{display:none!important}.main-content{overflow:visible}.page-body{padding:0}.invoice-box{border:none;box-shadow:none;padding:0;max-width:100%}}@media (max-width: 768px){.sidebar{width:200px;min-width:200px}.form-grid,.form-grid-3{grid-template-columns:1fr}}