:root{--primary: #4f46e5;--primary-hover: #4338ca;--bg-color: #f3f4f6;--card-bg: #ffffff;--text-main: #111827;--text-muted: #6b7280;--border-color: #e5e7eb;--success: #10b981;--danger: #ef4444;--warning: #f59e0b;--radius: 8px;--shadow: 0 1px 3px 0 rgb(0 0 0 / .1), 0 1px 2px -1px rgb(0 0 0 / .1)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-color);color:var(--text-main);line-height:1.5}a{text-decoration:none;color:inherit}button{cursor:pointer;border:none;font-family:inherit}.container{max-width:1200px;margin:0 auto;padding:0 1rem}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.5rem 1rem;border-radius:var(--radius);font-weight:500;transition:all .2s}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:var(--primary-hover)}.btn-danger{background-color:var(--danger);color:#fff}.btn-outline{border:1px solid var(--border-color);background:#fff;color:var(--text-main)}.btn-outline:hover{border-color:var(--primary);color:var(--primary)}.card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.5rem;border:1px solid var(--border-color)}.form-group{margin-bottom:1rem}.form-label{display:block;margin-bottom:.5rem;font-size:.875rem;font-weight:500;color:var(--text-main)}.form-input,.form-select{width:100%;padding:.5rem .75rem;border-radius:var(--radius);border:1px solid var(--border-color);background-color:#fff;transition:border-color .2s}.form-input:focus,.form-select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 2px #4f46e51a}.table-container{overflow-x:auto}table{width:100%;border-collapse:collapse;font-size:.875rem}th,td{padding:.75rem 1rem;text-align:left;border-bottom:1px solid var(--border-color)}th{background-color:#f9fafb;font-weight:600;color:var(--text-muted)}tr:last-child td{border-bottom:none}.status-badge{display:inline-flex;padding:.25rem .75rem;border-radius:9999px;font-size:.75rem;font-weight:500}.status-paid{background-color:#d1fae5;color:#065f46}.status-unpaid{background-color:#fee2e2;color:#991b1b}.status-pending{background-color:#fef3c7;color:#92400e}.navbar{background:var(--card-bg);border-bottom:1px solid var(--border-color);padding:1rem 0;margin-bottom:2rem}.nav-content{display:flex;justify-content:space-between;align-items:center}.nav-brand{font-size:1.25rem;font-weight:700;color:var(--primary)}.nav-links{display:flex;gap:1.5rem}.error-msg{color:var(--danger);font-size:.875rem;margin-top:.5rem}