:root{--primary: #0d9488;--primary-hover: #0f766e;--bg-color: #f0fdfa;--surface-color: #ffffff;--text-color: #111827;--text-muted: #6b7280;--border-color: #e5e7eb;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--radius: .75rem;--font-family: "Outfit", sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-color);color:var(--text-color);line-height:1.5;min-height:100vh;display:flex;flex-direction:column}.site-header{background:var(--surface-color);border-bottom:1px solid var(--border-color);padding:1rem 0;position:sticky;top:0;z-index:10}.header-content{max-width:1200px;margin:0 auto;padding:0 1.5rem;display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:.5rem;font-weight:700;font-size:1.25rem;color:var(--primary)}.logo svg{stroke:var(--primary)}nav{display:flex;gap:1.5rem}.nav-link{text-decoration:none;color:var(--text-muted);font-weight:500;transition:color .2s;cursor:pointer}.nav-link:hover,.nav-link.active{color:var(--primary)}.container{max-width:800px;margin:2rem auto;padding:0 1.5rem;flex:1}.tool-section{display:none;animation:fadeIn .3s ease-in-out}.tool-section.active{display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.tool-header{text-align:center;margin-bottom:2rem}.tool-header h1{font-size:2rem;color:var(--primary);margin-bottom:.5rem}.tool-header p{color:var(--text-muted)}.tool-card{background:var(--surface-color);border-radius:var(--radius);padding:2rem;box-shadow:var(--shadow-md);border:1px solid var(--border-color)}.input-group{margin-bottom:1.5rem}.input-group label{display:block;margin-bottom:.5rem;font-weight:500;color:var(--text-color)}input[type=date],input[type=number]{width:100%;padding:.75rem;border:1px solid var(--border-color);border-radius:.5rem;font-family:var(--font-family);font-size:1rem;transition:border-color .2s}input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #0d94881a}.flex-inputs{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.btn-primary{display:block;width:100%;padding:1rem;background:var(--primary);color:#fff;border:none;border-radius:.5rem;font-size:1.125rem;font-weight:600;cursor:pointer;transition:background .2s}.btn-primary:hover{background:var(--primary-hover)}.result-box{margin-top:2rem;padding-top:2rem;border-top:1px solid var(--border-color);background:#f0fdfa;padding:1.5rem;border-radius:.5rem}.result-box.hidden{display:none}.big-result{font-size:2.5rem;font-weight:700;color:var(--primary);text-align:center;line-height:1.2}.big-result small{font-size:1rem;color:var(--text-muted);font-weight:400;margin-right:.5rem}.details-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;margin-top:1.5rem}.detail-item{background:#fff;padding:1rem;border-radius:.5rem;text-align:center;box-shadow:var(--shadow-sm)}.detail-item .label{display:block;font-size:.875rem;color:var(--text-muted);margin-bottom:.25rem}.detail-item .value{font-size:1.25rem;font-weight:600;color:var(--text-color)}.next-bday{text-align:center;margin-top:1.5rem;padding:1rem;background:#fff;border-radius:.5rem;border:1px dashed var(--primary)}.next-bday h3{font-size:1rem;color:var(--text-muted);margin-bottom:.5rem}.next-bday p{font-weight:600;color:var(--primary)}.site-footer{text-align:center;padding:2rem;color:var(--text-muted);font-size:.875rem;margin-top:auto;border-top:1px solid var(--border-color)}@media(max-width:600px){.flex-inputs{grid-template-columns:1fr}.big-result{font-size:2rem}}