:root {
     --bg: #ffffff;
     --text: #1e293b;
     --accent: #0ea5e9;
     --success: #22c55e;
     --alert: #ef4444;
     --dim: #e2e8f0;
     --digit-size: 5rem;
     --gap: 2rem;
 }

 body {
     font-family: 'Monaco', 'Consolas', monospace;
     background-color: var(--bg);
     color: var(--text);
     display: flex;
     flex-direction: column;
     align-items: center;
     justify-content: center;
     height: 100vh;
     margin: 0;
     overflow: hidden;
 }

 .viewport {
     width: 100%;
     max-width: 800px;
     overflow: hidden;
     position: relative;
     padding: 2rem 0;
     mask-image: linear-gradient(to right, transparent, black 30%, black 70%, transparent);
     -webkit-mask-image: linear-gradient(to right, transparent, black 30%, black 70%, transparent);
 }

 .digit-row {
     font-size: var(--digit-size);
     display: flex;
     gap: var(--gap);
     transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1);
     will-change: transform;
     padding-left: calc(50% - 2rem);
 }

 .digit {
     min-width: 4rem;
     text-align: center;
     transition: all 0.4s;
     opacity: 0.15;
     transform: scale(0.8);
     color: var(--text);
 }

 .digit.highlight { opacity: 1; color: var(--accent); transform: scale(1.1); }
 .digit.found {
     color: var(--success) !important;
     opacity: 1;
     filter: drop-shadow(0 0 10px rgba(34, 197, 94, 0.4));
     transform: scale(1.3);
     font-weight: bold;
 }

 #cursor-container { margin-top: -1rem; z-index: 10; }
 #cursor { font-size: 2.5rem; color: var(--accent); }

 .btn-group { display: flex; gap: 1rem; margin-top: 3rem; }

 button {
     background: var(--dim);
     color: var(--text);
     border: 1px solid #cbd5e1;
     padding: 12px 28px;
     border-radius: 12px;
     cursor: pointer;
     font-weight: bold;
     font-size: 0.9rem;
     transition: all 0.2s;
     /* Critical for iframes: */
     pointer-events: auto !important;
 }

 button#playBtn { background: var(--text); color: white; border: none; }
 button:disabled { opacity: 0.5; cursor: not-allowed; }

 .verdict-box {
     height: 4rem;
     margin-top: 1.5rem;
     font-size: 2.5rem;
     font-weight: 800;
     text-align: center;
 }