:root{--primary:#2563eb;--primary-dark:#1d4ed8;--danger:#dc2626;--bg:#f4f6fb;--text:#1f2933;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:Segoe UI,system-ui,-apple-system,sans-serif}button{cursor:pointer;font-family:inherit}.auth-screen{background:linear-gradient(135deg,#2563eb 0%,#7c3aed 100%);justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.auth-card{background:#fff;border-radius:16px;flex-direction:column;gap:6px;width:100%;max-width:380px;padding:32px;display:flex;box-shadow:0 20px 45px #0003}.auth-card h1{text-align:center;margin:0 0 2px;font-size:26px}.auth-subtitle{text-align:center;color:#64748b;margin:0 0 16px;font-size:14px}.auth-card label{margin-top:10px;font-size:13px;font-weight:600}.auth-card input,.auth-card select{border:1px solid #cbd5e1;border-radius:8px;padding:10px 12px;font-size:15px}.auth-card button[type=submit]{background:var(--primary);color:#fff;border:none;border-radius:8px;margin-top:18px;padding:12px;font-size:16px;font-weight:600}.auth-card button[type=submit]:hover{background:var(--primary-dark)}.auth-error{color:var(--danger);margin-top:10px;font-size:14px}.auth-footer{text-align:center;margin-top:14px;font-size:14px}.auth-hint{text-align:center;color:#94a3b8;margin-top:4px;font-size:12px}.center-msg{color:#64748b;justify-content:center;align-items:center;height:100vh;font-size:18px;display:flex}.center-msg.error{color:var(--danger)}.board-screen{flex-direction:column;height:100vh;display:flex;overflow:hidden}.board-header{background:#fff;border-bottom:1px solid #e2e8f0;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;padding:10px 16px;display:flex}.board-header-left,.board-header-right{align-items:center;gap:10px;display:flex}.board-name{font-size:18px;font-weight:700}.nav-btn{background:#fff;border:1px solid #cbd5e1;border-radius:8px;padding:8px 12px}.edit-toggle{align-items:center;gap:6px;font-size:14px;display:flex}.user-name{color:#475569;font-size:14px}.message-bar{background:#fffbea;border-bottom:2px solid #fbbf24;align-items:center;gap:10px;min-height:56px;padding:10px 16px;display:flex}.message-content{flex-wrap:wrap;flex:1;align-items:center;gap:6px;min-height:32px;display:flex}.message-placeholder{color:#a8a29e;font-size:15px}.message-word{background:#fff;border:1px solid #e2e8f0;border-radius:6px;padding:4px 10px;font-size:16px}.message-actions{gap:6px;display:flex}.message-actions button{background:#fff;border:none;border-radius:8px;padding:8px 10px;font-size:16px;box-shadow:0 1px 3px #0000001a}.speak-btn{color:#fff;font-weight:600;background:var(--primary)!important;padding:8px 16px!important}.board-grid{flex:1;gap:8px;padding:10px;display:grid;overflow:auto}.grid-cell{border:2px solid #e2e8f0;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;gap:4px;min-height:70px;padding:6px;transition:transform 50ms,box-shadow .1s;display:flex}.grid-cell:active{transform:scale(.96)}.grid-cell:not(.empty):hover{box-shadow:0 2px 10px #0000001f}.grid-cell.empty{cursor:default;border-style:dashed}.grid-cell.edit-mode{cursor:pointer;border-style:dashed;border-color:#94a3b8}.cell-symbol{object-fit:contain;pointer-events:none;width:48%;max-height:55%}.cell-label{text-align:center;word-break:break-word;pointer-events:none;font-size:14px;font-weight:600}.cell-add{color:#94a3b8;font-size:28px}.modal-backdrop{z-index:100;background:#0f172a80;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.modal{background:#fff;border-radius:14px;flex-direction:column;width:100%;max-width:440px;max-height:90vh;padding:24px;display:flex;overflow-y:auto}.modal h2{margin-top:0}.modal label{margin-top:12px;font-size:13px;font-weight:600}.modal input,.modal select{border:1px solid #cbd5e1;border-radius:8px;margin-top:4px;padding:9px 10px;font-size:15px}.symbol-search-row{gap:8px;margin-top:4px;display:flex}.symbol-search-row input{flex:1;margin-top:0}.symbol-search-row button{background:var(--primary);color:#fff;border:none;border-radius:8px;padding:0 14px}.current-symbol{color:#64748b;align-items:center;gap:8px;margin-top:10px;font-size:13px;display:flex}.current-symbol img{object-fit:contain;width:40px;height:40px}.symbol-results{grid-template-columns:repeat(4,1fr);gap:8px;max-height:200px;margin-top:10px;display:grid;overflow-y:auto}.symbol-result{background:#f8fafc;border:1px solid #e2e8f0;border-radius:8px;padding:6px}.symbol-result img{object-fit:contain;width:100%;height:48px}.modal-actions{justify-content:flex-end;gap:8px;margin-top:20px;display:flex}.modal-actions button{background:#fff;border:1px solid #cbd5e1;border-radius:8px;padding:10px 16px}.modal-actions .primary{background:var(--primary);color:#fff;border:none}.modal-actions .danger{color:var(--danger);border-color:var(--danger);margin-right:auto}@media (width<=640px){.board-grid{gap:6px;padding:6px}.cell-label{font-size:12px}.board-header{flex-direction:column;align-items:flex-start}}