*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #faf9f7;--surface: #ffffff;--border: #e8e4de;--text: #1a1917;--text-muted: #6b6760;--primary: #2563eb;--primary-light: #eff6ff;--radius: 12px;--font: "Inter", ui-sans-serif, system-ui, sans-serif}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}.page{min-height:100vh;display:flex;flex-direction:column}.site-header{padding:1rem 1.5rem;border-bottom:1px solid var(--border);background:var(--surface)}.logo{font-weight:700;font-size:1.1rem;color:var(--primary);max-width:640px;margin:0 auto}.main{flex:1;max-width:640px;margin:0 auto;padding:2rem 1.5rem 4rem;width:100%}.hero{margin-bottom:2rem}.hero h1{font-size:clamp(1.5rem,4vw,2rem);font-weight:800;line-height:1.2;letter-spacing:-.02em;margin-bottom:.5rem}.hero p{color:var(--text-muted);font-size:1rem}.calculator{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;display:flex;flex-direction:column;gap:1.25rem;margin-bottom:2.5rem;box-shadow:0 1px 4px #0000000f}.field{display:flex;flex-direction:column;gap:.4rem}.field label{font-size:.875rem;font-weight:600;color:var(--text)}.input-wrap{position:relative;display:flex;align-items:center}.prefix{position:absolute;left:.75rem;color:var(--text-muted);font-size:.9rem;pointer-events:none}.input-wrap input{width:100%;padding:.65rem .75rem .65rem 1.75rem;border:1px solid var(--border);border-radius:8px;font-size:1rem;font-family:var(--font);background:var(--bg);color:var(--text);outline:none;transition:border-color .15s}.input-wrap input:focus{border-color:var(--primary)}.input-row{display:flex;gap:.5rem;align-items:flex-start}.flex-1{flex:1}.freq-select{padding:.65rem .75rem;border:1px solid var(--border);border-radius:8px;font-size:.9rem;font-family:var(--font);background:var(--bg);color:var(--text);outline:none;cursor:pointer;white-space:nowrap}.freq-select:focus{border-color:var(--primary)}.range-inputs{display:flex;align-items:center;gap:.4rem}.range-inputs .input-wrap{flex:1}.range-sep{font-size:.85rem;color:var(--text-muted);white-space:nowrap}.range-toggle{background:none;border:none;padding:0;font-size:.78rem;color:var(--text-muted);cursor:pointer;text-align:left;margin-top:.1rem}.range-toggle:hover{color:var(--primary)}.result{background:var(--primary-light);border:1px solid #bfdbfe;border-radius:var(--radius);padding:1.25rem}.result-main{display:flex;flex-direction:column;gap:.2rem;margin-bottom:1rem}.result-label{font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--primary)}.result-value{font-size:2rem;font-weight:800;color:var(--primary);letter-spacing:-.02em;line-height:1}.result-sub{display:flex;flex-direction:column;gap:.5rem}.result-detail{display:flex;justify-content:space-between;align-items:center}.detail-label{font-size:.875rem;color:var(--text-muted)}.detail-value{font-size:.875rem;font-weight:600;color:var(--text)}.explainer{display:flex;flex-direction:column;gap:1rem}.explainer h2{font-size:1.1rem;font-weight:700;margin-top:.5rem}.explainer p{color:var(--text-muted);font-size:.95rem}.explainer ul{color:var(--text-muted);font-size:.95rem;padding-left:1.25rem;display:flex;flex-direction:column;gap:.4rem}.explainer li strong{color:var(--text)}.site-footer{padding:1.5rem;text-align:center;font-size:.8rem;color:var(--text-muted);border-top:1px solid var(--border)}.site-footer a{color:var(--text-muted);text-decoration:underline}.footer-link{background:none;border:none;padding:0;font-size:inherit;color:var(--text-muted);text-decoration:underline;cursor:pointer;font-family:var(--font)}.footer-link:hover{color:var(--primary)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;display:flex;align-items:center;justify-content:center;z-index:100;padding:1rem}.modal{background:var(--surface);border-radius:var(--radius);max-width:600px;width:100%;max-height:85vh;overflow-y:auto;padding:2rem;position:relative;box-shadow:0 8px 32px #0000002e;display:flex;flex-direction:column;gap:1rem}.modal h2{font-size:1.4rem;font-weight:800}.modal h3{font-size:1rem;font-weight:700;margin-top:.5rem}.modal p{font-size:.9rem;color:var(--text-muted);line-height:1.7}.modal a{color:var(--primary)}.modal-close{position:absolute;top:1rem;right:1rem;background:none;border:none;font-size:1.1rem;cursor:pointer;color:var(--text-muted);line-height:1;padding:.25rem}.modal-close:hover{color:var(--text)}