:root{--color-main:#1d3461;--color-medium:#247ba0;--color-light:#e7f8ff;--color-cta:#ff1861;--color-bg:#fff;--color-text:#1d3461;--color-text-light:#6b7280;--color-border:#e5e7eb;--color-hover:#f3f4f6;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a;--spacing-xs:clamp(.25rem, .5vw, .5rem);--spacing-sm:clamp(.5rem, 1vw, 1rem);--spacing-md:clamp(1rem, 2vw, 1.5rem);--spacing-lg:clamp(1.5rem, 3vw, 3rem);--font-size-base:1rem;--font-size-lg:clamp(1rem, .875rem + .5vw, 1.25rem);--font-size-xl:clamp(1.25rem, 1rem + 1vw, 2rem);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Roboto,-apple-system,BlinkMacSystemFont,Segoe UI,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;font-weight:400;line-height:1.5}*{box-sizing:border-box;margin:0;padding:0}html{max-width:100vw;overflow-x:hidden}body{background:var(--color-bg);color:var(--color-text);max-width:100vw;min-height:100vh;margin:0;overflow-x:hidden}::-webkit-scrollbar{width:12px;height:12px}::-webkit-scrollbar-track{background:#f1f1f1}::-webkit-scrollbar-thumb{background:var(--color-main);border-radius:0}::-webkit-scrollbar-thumb:hover{background:var(--color-medium)}*{scrollbar-width:thin;scrollbar-color:var(--color-main) #f1f1f1}::selection{background:var(--color-medium);color:#fff}.container{box-sizing:border-box;width:100%;max-width:100%;margin:0 auto;padding:0 1rem}.container-standard{max-width:1400px}.container-wide{max-width:1800px}.card{box-shadow:var(--shadow-sm);border:1px solid var(--color-border);box-sizing:border-box;background:#fff;border-radius:0;width:100%;padding:1rem}@media (width>=1400px){.card{padding:1.25rem}}.text-main{color:var(--color-main)}.text-medium{color:var(--color-medium)}.text-light{color:var(--color-text-light)}.text-cta{color:var(--color-cta)}.bg-main{background-color:var(--color-main)}.bg-light{background-color:var(--color-light)}.bg-hover{background-color:var(--color-hover)}.gap-xs{gap:var(--spacing-xs)}.gap-sm{gap:var(--spacing-sm)}.gap-md{gap:var(--spacing-md)}.gap-lg{gap:var(--spacing-lg)}.p-xs{padding:var(--spacing-xs)}.p-sm{padding:var(--spacing-sm)}.p-md{padding:var(--spacing-md)}.p-lg{padding:var(--spacing-lg)}.m-xs{margin:var(--spacing-xs)}.m-sm{margin:var(--spacing-sm)}.m-md{margin:var(--spacing-md)}.m-lg{margin:var(--spacing-lg)}.btn{cursor:pointer;text-align:center;border:none;border-radius:0;padding:.5rem 1rem;font-family:inherit;font-size:.9rem;font-weight:500;text-decoration:none;transition:all .2s;display:inline-block;box-shadow:0 1px 2px #0000000d}.btn:hover{box-shadow:0 2px 4px #0000001a}.btn-primary{background:var(--color-main);color:#fff}.btn-primary:hover{background:var(--color-medium)}.btn-secondary{background:var(--color-main);color:#fff}.btn-secondary:hover{background:var(--color-medium)}.btn-cta{background:var(--color-cta);color:#fff}.btn-cta:hover{opacity:.9}.btn-danger{background:var(--color-cta);color:#fff}.btn-danger:hover{opacity:.9}.btn-outline{color:var(--color-main);border:1px solid var(--color-main);background:0 0}.btn-outline:hover{background:var(--color-main);color:#fff}.btn-sm{padding:.4rem .85rem;font-size:.85rem}.btn-lg{padding:.75rem 1.5rem;font-size:1rem}.btn:disabled{opacity:.5;cursor:not-allowed}.input,input[type=text],input[type=email],input[type=password],input[type=number],input[type=tel],input[type=url],input[type=search],textarea,select{border:1px solid var(--color-border);color:var(--color-text);background:#fff;border-radius:0;width:100%;padding:.5rem .75rem;font-family:inherit;font-size:.9rem;transition:border-color .2s}.input:focus,input:focus,textarea:focus,select:focus{border-color:var(--color-medium);outline:none}.input:disabled,input:disabled,textarea:disabled,select:disabled{background:var(--color-hover);cursor:not-allowed;opacity:.6}textarea{resize:vertical;min-height:100px}.input-sm{padding:.35rem .5rem;font-size:.85rem}.input-lg{padding:.75rem 1rem;font-size:1rem}.form-group{flex-direction:column;gap:.5rem;margin-bottom:1rem;display:flex}.form-group label{color:var(--color-text);font-size:.9rem;font-weight:500}.form-group .help-text{color:var(--color-text-light);font-size:.85rem}.checkbox-group,.radio-group{align-items:center;gap:.5rem;display:flex}.checkbox-group input[type=checkbox],.radio-group input[type=radio]{cursor:pointer;width:18px;height:18px}.table-responsive{-webkit-overflow-scrolling:touch;width:100%;overflow-x:auto}.table{border-collapse:collapse;background:#fff;width:100%}.table th{background:var(--color-hover);text-transform:uppercase;letter-spacing:.5px;color:var(--color-text-light);border-bottom:1px solid var(--color-border);text-align:left;padding:.75rem 1rem;font-size:.85rem;font-weight:600}.table td{color:var(--color-text);border-bottom:1px solid var(--color-border);padding:.75rem 1rem;font-size:.9rem}.table tbody tr:hover{background:var(--color-hover)}.table-striped tbody tr:nth-child(2n){background:#00000005}.table-bordered,.table-bordered th,.table-bordered td{border:1px solid var(--color-border)}.table-sticky-first th:first-child,.table-sticky-first td:first-child{z-index:2;background:#fff;position:sticky;left:0}.table-sticky-first th:first-child{z-index:3;background:var(--color-hover)}.section{box-shadow:var(--shadow-sm);border:1px solid var(--color-border);background:#fff;border-radius:0;margin-bottom:1.5rem;padding:1rem}.section-header{justify-content:space-between;align-items:center;margin-bottom:1rem;display:flex}.section-title{color:var(--color-main);margin:0;font-size:1.3rem;font-weight:700}.section-subtitle{color:var(--color-text-light);margin-top:.25rem;font-size:.9rem}.upload-area{border:2px dashed var(--color-border);text-align:center;cursor:pointer;background:var(--color-light);border-radius:0;padding:3rem 2rem;transition:all .2s}.upload-area:hover{border-color:var(--color-medium)}.upload-area.drag-over{border-color:var(--color-cta);background:#fff0f5}.upload-area-content{flex-direction:column;align-items:center;gap:.75rem;display:flex}.upload-area-icon{color:var(--color-medium);font-size:3rem}.upload-area-content p{color:var(--color-text-light);font-size:.9rem}.upload-area-content .btn{margin-top:.5rem}.file-list{gap:.75rem;display:grid}.file-item{background:var(--color-hover);border-left:4px solid var(--color-main);border-radius:0;justify-content:space-between;align-items:center;padding:1rem;display:flex}.file-info{flex:1;align-items:center;gap:1rem;display:flex}.file-icon{background:var(--color-light);width:40px;height:40px;color:var(--color-main);justify-content:center;align-items:center;font-weight:600;display:flex}.file-details h4{color:var(--color-text);margin-bottom:.25rem;font-size:.95rem;font-weight:600}.file-details p{color:var(--color-text-light);font-size:.85rem}.file-actions{gap:.5rem;display:flex}.color-dot{border-radius:50%;flex-shrink:0;width:16px;height:16px}.alert{border-left:4px solid;border-radius:0;margin-bottom:1rem;padding:1rem;font-size:.9rem}.alert-info{color:#075985;background:#e0f2fe;border-color:#0284c7}.alert-success{color:#166534;background:#dcfce7;border-color:#16a34a}.alert-warning{color:#856404;background:#fff3cd;border-color:#ffc107}.alert-danger{border-color:var(--color-cta);color:#991b1b;background:#fee}.badge{text-transform:uppercase;letter-spacing:.5px;border-radius:0;padding:.25rem .5rem;font-size:.75rem;font-weight:600;display:inline-block}.badge-primary{background:var(--color-main);color:#fff}.badge-secondary{background:var(--color-text-light);color:#fff}.badge-success{color:#fff;background:#10b981}.badge-warning{color:#fff;background:#f59e0b}.badge-danger{background:var(--color-cta);color:#fff}.spinner{border:4px solid var(--color-border);border-top-color:var(--color-main);border-radius:50%;width:40px;height:40px;animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.spinner-sm{border-width:2px;width:20px;height:20px}.spinner-lg{border-width:6px;width:60px;height:60px}.loading-overlay{z-index:9999;background:#ffffffe6;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.header{margin-bottom:2rem}.header-content{flex-direction:column;gap:1rem;display:flex}.header-logo{width:auto;height:60px;transition:opacity .2s;display:block}.header-logo:hover{opacity:.8}.header h1{color:var(--color-main);margin:0;font-size:2rem;font-weight:700;line-height:1.2}.header p{color:var(--color-text-light);font-size:.95rem}@media (width<=767px){.section{padding:.75rem}.section-title{font-size:1.1rem}.header-logo{height:40px}.header h1{font-size:1.5rem}.upload-area{padding:2rem 1rem}.file-item{flex-direction:column;align-items:flex-start;gap:.75rem}.file-actions{justify-content:flex-start;width:100%}.table th,.table td{padding:.5rem;font-size:.85rem}.btn{padding:.45rem .75rem;font-size:.85rem}}@media (width<=480px){.header-logo{height:35px}.header h1{font-size:1.25rem}.section-title{font-size:1rem}.btn-sm{padding:.35rem .6rem;font-size:.75rem}.table th,.table td{padding:.4rem;font-size:.75rem}}html,body{overflow-x:clip}#root{min-height:100vh}input::placeholder{color:#ffffffbf}@media (width<=900px){.tables-row>div{flex:100%!important}}@media (width<=600px){.summary-cards>div{flex:120px!important}}.site-footer{color:#e7f8ff;background:#1d3461;margin-top:40px;padding:28px 32px;font-size:.875rem}.footer-divider{border:none;border-top:1px solid #ffffff26;margin:14px 0}.footer-nav{flex-wrap:wrap;justify-content:center;gap:4px 0;display:flex}.footer-nav a{color:#e7f8ffcc;padding:2px 12px;font-size:.8125rem;text-decoration:none}.footer-nav a+a{border-left:1px solid #fff3}.footer-social{flex-wrap:wrap;justify-content:center;gap:4px;display:flex}.footer-social a{color:#e7f8ffb3;justify-content:center;align-items:center;min-width:44px;min-height:44px;padding:8px;display:flex}.footer-social svg{width:22px;height:22px}.footer-copyright{text-align:center;color:#e7f8ff80;font-size:.8125rem}@media (width<=768px){.site-header{gap:8px!important;padding:8px 12px!important}.site-header .header-logo{order:1;height:44px!important}.site-header .header-buttons{order:2;margin-left:auto;gap:6px!important}.site-header .header-buttons button,.site-header .header-buttons label{height:30px!important;padding:0 10px!important;font-size:12px!important}.site-header .header-title{order:3;flex:100%!important;padding:2px 0 0!important;font-size:18px!important}.header-presets{order:4;flex:100%!important;justify-content:center!important;padding:4px 0 0!important;display:flex!important}.header-presets select{width:100%!important;max-width:100%!important}.input-bar{gap:8px!important;padding:8px 12px!important}.setup-label-col{flex-direction:row!important;flex:100%!important;justify-content:space-between!important;align-items:center!important}.remove-setup-btn{width:32px!important;height:32px!important;font-size:22px!important}.input-bar .chainring-container,.input-bar .cassette-container{flex:100%!important;min-width:0!important;max-width:100%!important}.summary-cards{gap:8px!important}.summary-cards>div{flex:calc(50% - 4px)!important;min-width:0!important;padding:8px 10px!important}.summary-cards .card-label{font-size:13px!important}.summary-cards .card-value{font-size:18px!important}.card-total-gears{order:1!important}.card-range{order:2!important}.card-lowest-speed{order:3!important}.card-highest-speed{order:4!important}.card-gear-ratio{order:5!important}.gear-table{overflow-x:auto}.gear-table table{table-layout:auto!important}.gear-table colgroup{display:none}.gear-table th,.gear-table td,.speed-table th,.speed-table td{padding:6px 8px!important;font-size:14px!important}.footer-social{gap:0!important}.footer-social a{width:25%!important;min-width:0!important}.sticky-inputbar{z-index:auto!important;position:static!important;top:auto!important}}.about-block{border:1px solid var(--color-border);background:#fff;margin-top:3rem}.about-block details{width:100%}.about-block summary{cursor:pointer;-webkit-user-select:none;user-select:none;justify-content:space-between;align-items:center;padding:1rem 1.25rem;list-style:none;display:flex}.about-block summary::-webkit-details-marker{display:none}.about-block-title{color:var(--color-main);font-family:Raleway,sans-serif;font-size:30px;font-weight:800}.about-chevron{width:22px;height:22px;color:var(--color-medium);flex-shrink:0;transition:transform .2s}.about-block details[open] summary .about-chevron{transform:rotate(180deg)}.about-body{color:var(--color-text);padding:0 1.25rem 1.5rem;font-family:Roboto,sans-serif;font-size:18px;font-weight:400;line-height:1.75}.about-body p{margin:0 0 .75rem}.about-body p:last-child{margin-bottom:0}.about-body h2{color:var(--color-main);margin:1.5rem 0 .5rem;font-family:Raleway,sans-serif;font-size:30px;font-weight:800}.about-body h3{color:var(--color-main);margin:1.1rem 0 .35rem;font-family:Raleway,sans-serif;font-size:26px;font-weight:800}.about-body ul,.about-body ol{margin:.35rem 0 .75rem 1.5rem;padding:0}.about-body li{margin-bottom:.3rem}.about-body a{color:var(--color-medium);text-decoration:none}.about-body a:hover{color:var(--color-cta)}.about-faq{margin:0;padding:0}.about-faq-item{border-top:1px solid var(--color-border);padding:.85rem 0}.about-faq-item:last-child{border-bottom:1px solid var(--color-border)}.about-faq dt{color:var(--color-main);margin-bottom:.3rem;font-weight:700}.about-faq dd{color:var(--color-text);margin:0}