:root{--bg: #141311;--card: #141311;--muted: #9aa3a3 }body{font-family:Inter,ui-sans-serif,system-ui,Segoe UI,Roboto,Arial;background:var(--bg);margin:0;color:#fff}.site-header{position:sticky;top:0;background:#141311cc;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);border-bottom:1px solid rgba(255,255,255,.06)}.site-header .container{display:flex;justify-content:space-between;align-items:center;padding:12px 20px;max-width:1100px;margin:0 auto}.title{font-weight:700}.math-link{color:#0369a1;text-decoration:none}.page-container{max-width:1100px;margin:20px auto;padding:0 16px}.home-grid{display:grid;grid-template-columns:1fr 1.2fr}@media (max-width:800px){.home-grid{grid-template-columns:1fr}}.home-grid.centered{grid-template-columns:1fr;align-items:center;justify-items:center}.home-grid .center-section{display:flex;justify-content:center;width:100%}.card{background:var(--card);padding:16px;border-radius:8px;box-shadow:0 1px 2px #0206170f;margin-bottom:12px}.form label{display:block;margin-bottom:8px}.form input{display:block;width:100%;padding:8px;margin-top:6px;border:1px solid rgba(255,255,255,.06);border-radius:6px}.btn{background:#0369a1;color:#fff;padding:10px 14px;border-radius:6px;border:none;cursor:pointer}.field-error{color:#b91c1c;font-size:13px;margin-top:6px}.helper{font-size:13px;color:var(--muted);margin:8px 0}.sign-card .sign-name{font-size:20px;font-weight:700}.loader{display:flex;align-items:center}.spinner{width:28px;height:28px;border-radius:50%;border:3px solid #e2e8f0;border-top-color:#0369a1;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.placeholder{color:var(--muted)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#02061773;display:flex;align-items:center;justify-content:center;z-index:60}.modal{background:var(--card);border-radius:10px;max-width:920px;width:94%;box-shadow:0 10px 30px #0206174d;overflow:hidden;max-height:85vh}.modal-body{display:flex;gap:18px;padding:18px;max-height:calc(85vh - 36px)}.modal-left{flex:0 0 360px;display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start}.modal-left svg{max-width:100%;height:auto}.modal-right{flex:1;display:flex;flex-direction:column;gap:12px;overflow:auto;max-height:calc(85vh - 80px);padding-right:8px}.modal-right::-webkit-scrollbar{width:8px}.modal-right::-webkit-scrollbar-track{background:#141311}.modal-right::-webkit-scrollbar-thumb{background-color:#6b7280;border-radius:6px}.modal-right::-webkit-scrollbar-thumb:hover{background-color:#4b5563}.modal-actions{display:flex;justify-content:flex-end;padding-top:6px;position:sticky;bottom:0;background:linear-gradient(to top,#181616,#18161600);padding-bottom:8px}@media (max-width:880px){.modal-body{flex-direction:column}.modal-left{flex:unset}}.left-top .sign-name-large{font-size:22px;font-weight:800}.left-top .sign-tagline{color:var(--muted);font-size:13px}.left-image{padding:8px;display:flex;align-items:center;justify-content:center;overflow:visible;max-height:none}.left-image svg{max-height:70vh;width:auto}.panel h4{margin:0 0 8px}.panel-content{color:inherit;white-space:pre-wrap}.modal-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px}.spinner{width:36px;height:36px;border-radius:50%;border:4px solid #e2e8f0;border-top-color:#0369a1;animation:spin 1s linear infinite}.sign-image-wrap{display:flex;justify-content:center;margin:6px 0}.sign-image{width:86px;height:86px;object-fit:contain;display:block}.sign-large-image-wrap{display:flex;flex-direction:column;align-items:center;gap:8px}.sign-large-image{width:200px;object-fit:contain}input{background:#141311;color:#fff}input[type=date]::-webkit-calendar-picker-indicator{filter:invert(1);opacity:.8}input[type=time]::-webkit-calendar-picker-indicator{filter:invert(1);opacity:.8}