:root{--bg: #0b1020;--card: #151a2c;--accent: #4f8cff;--accent-soft: rgba(79, 140, 255, .15);--text: #f5f7ff;--muted: #9aa0c2;--danger: #ff4f6a;--success: #3ac97a}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,Inter,sans-serif;background:radial-gradient(circle at top,#1b2340 0,#050712 55%,#020308);color:var(--text);overflow:hidden}.app-shell{height:100dvh;display:flex;align-items:stretch;justify-content:center;padding:32px 16px;overflow-y:auto;-webkit-overflow-scrolling:touch}.app-container{width:100%;max-width:1100px;display:grid;grid-template-columns:2fr 1.2fr;gap:24px}@media(max-width:900px){.app-container{grid-template-columns:1fr}}.card{background:linear-gradient(145deg,#151a2c,#101425);border-radius:18px;padding:24px 24px 20px;box-shadow:0 18px 40px #00000073;border:1px solid rgba(255,255,255,.04)}input{font-size:16px!important}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.card-title{font-size:1.2rem;font-weight:600}.card-subtitle{font-size:.85rem;color:var(--muted)}.badge{padding:4px 10px;border-radius:999px;font-size:.75rem;background:var(--accent-soft);color:var(--accent)}h1{font-size:1.6rem;margin:0 0 8px}.app-tagline{font-size:.9rem;color:var(--muted);margin-bottom:20px}label{font-size:.85rem;color:var(--muted);display:block;margin-bottom:4px}select,input{width:100%;padding:10px 12px;border-radius:10px;border:1px solid rgba(255,255,255,.08);background:#101425;color:var(--text);font-size:.95rem;outline:none}select:focus,input:focus{border-color:var(--accent);box-shadow:0 0 0 1px #4f8cff66}button{border-radius:999px;border:none;padding:10px 18px;font-size:.95rem;font-weight:500;cursor:pointer;background:var(--accent);color:#fff;display:inline-flex;align-items:center;gap:6px;transition:transform .08s ease,box-shadow .08s ease,background .12s ease}button:hover{background:#3b73e0;transform:translateY(-1px);box-shadow:0 8px 18px #4f8cff59}button:disabled{opacity:.6;cursor:default;box-shadow:none;transform:none}.button-secondary{background:transparent;border:1px solid rgba(255,255,255,.12);color:var(--muted)}.button-secondary:hover{background:#ffffff0a;box-shadow:none}.row{display:flex;gap:12px}.row>*{flex:1}.spacer{height:16px}.letter-display{display:flex;align-items:center;justify-content:space-between;margin:12px 0 20px;gap:25px;padding:10px 0}.letter-circle{width:72px;height:72px;border-radius:50%;background:radial-gradient(circle at 30% 20%,#fff,#4f8cff);display:flex;align-items:center;justify-content:center;font-size:2.4rem;font-weight:700;color:#050712;box-shadow:0 12px 30px #4f8cff80}.letter-meta{font-size:.85rem;color:var(--muted)}.status{margin-top:10px;font-size:.9rem}.status.error{color:var(--danger)}.status.success{color:var(--success)}.leaderboard-list{list-style:none;padding:0;margin:12px 0 0}.leaderboard-item{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid rgba(255,255,255,.04);font-size:.9rem}.leaderboard-rank{color:var(--muted);width:24px}.leaderboard-name{flex:1}.leaderboard-score{font-weight:500}.chip-row{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}.chip{padding:4px 10px;border-radius:999px;font-size:.75rem;background:#ffffff0a;color:var(--muted)}