:root{--bg-color: #0f172a;--panel-bg: #1e293b;--text-main: #f8fafc;--text-muted: #94a3b8;--accent-blue: #38bdf8;--accent-purple: #c084fc;--accent-gold: #f59e0b;--card-bg: #ffffff;--card-border: #cbd5e1}body{margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background-color:var(--bg-color);color:var(--text-main);min-height:100vh}.app-container{max-width:900px;margin:0 auto;padding:24px 16px}.spinner{display:inline-block;width:14px;height:14px;border:2px solid rgba(255,255,255,.3);border-radius:50%;border-top-color:#fff;animation:spin .8s linear infinite;margin-right:8px;vertical-align:middle}@keyframes spin{to{transform:rotate(360deg)}}.app-header{display:flex;justify-content:space-between;align-items:center;background:var(--panel-bg);padding:16px 24px;border-radius:12px;border:1px solid #334155;margin-bottom:24px}.user-info{display:flex;flex-direction:column;gap:4px}.username{font-size:1.2rem;font-weight:700;color:var(--accent-blue)}.address-badge{font-family:monospace;font-size:.85rem;color:var(--text-muted);background:#0f172a;padding:4px 8px;border-radius:6px}.btn{padding:10px 18px;font-size:.95rem;font-weight:600;border-radius:8px;border:none;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:transform .1s ease,filter .2s ease}.btn:active{transform:scale(.97)}.btn-primary{background:linear-gradient(135deg,#0284c7,#2563eb);color:#fff}.btn-primary:disabled{background:#475569;cursor:not-allowed;opacity:.6}.btn-secondary{background:#334155;color:var(--text-main)}.btn-secondary:hover{background:#475569}.btn-gold{background:linear-gradient(135deg,#d97706,#f59e0b);color:#0f172a;font-weight:700}.btn-icon{padding:4px 8px;font-size:.8rem;border-radius:4px;margin:2px}.section{background:var(--panel-bg);padding:20px;border-radius:12px;border:1px solid #334155;margin-bottom:24px}.section-title{font-size:1.2rem;font-weight:700;margin-top:0;margin-bottom:16px;display:flex;justify-content:space-between;align-items:center}.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:14px}.card-item{width:110px;height:150px;background:var(--card-bg);color:#0f172a;border-radius:10px;border:2px solid var(--card-border);display:flex;flex-direction:column;justify-content:space-between;padding:8px;box-sizing:border-box;cursor:pointer;position:relative;-webkit-user-select:none;user-select:none;transition:transform .2s ease,box-shadow .2s ease}.card-item.mini{width:75px;height:105px;padding:5px;border-radius:8px;cursor:default}.card-item.mini .card-corner{font-size:.75rem}.card-item.mini .card-center{font-size:1.4rem}.card-item.mini.face-down{background:linear-gradient(135deg,#1e293b,#0f172a);border:2px dashed #475569;color:var(--accent-gold);display:flex;align-items:center;justify-content:center}.card-item.mini.face-down .card-center{font-size:1.8rem;font-weight:700;text-shadow:0 0 8px rgba(245,158,11,.4)}.card-item:hover{transform:translateY(-4px);box-shadow:0 8px 16px #0006}.card-item.selected{border-color:var(--accent-blue);box-shadow:0 0 0 3px #38bdf880;transform:translateY(-6px)}.card-corner{font-size:1rem;font-weight:800;line-height:1}.card-center{font-size:2.2rem;font-weight:900;text-align:center;align-self:center}.card-item.foil{background:linear-gradient(135deg,#fff,#e2e8f0,#fef08a,#bae6fd,#fff);background-size:200% 200%;animation:foil-shimmer 3s ease infinite;border:2px solid #f59e0b}@keyframes foil-shimmer{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0f172ad9;display:flex;justify-content:center;align-items:center;z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);animation:fadeIn .2s ease}.modal-content{background:var(--panel-bg);border:1px solid #334155;border-radius:16px;padding:24px 32px;max-width:480px;width:90%;text-align:center;box-shadow:0 20px 25px -5px #00000080;animation:popUp .3s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes popUp{0%{transform:scale(.85);opacity:0}to{transform:scale(1);opacity:1}}.power-meter{display:flex;justify-content:space-between;align-items:center;background:#0f172a;padding:10px 16px;border-radius:8px;border:1px solid #334155;margin-bottom:16px}.power-meter.overpowered{border-color:#ef4444;background:#450a0a}.power-val{font-weight:800;font-size:1.1rem}.power-val.valid{color:#22c55e}.power-val.invalid{color:#ef4444}.deck-slot-container{display:flex;gap:12px;overflow-x:auto;padding-bottom:8px}.deck-slot-item{display:flex;flex-direction:column;align-items:center}.slot-actions{display:flex;gap:2px;margin-top:6px}.battle-replay-box{background:#0f172a;padding:16px;border-radius:10px;border:1px solid #334155;margin-top:16px}.rounds-container{display:flex;gap:16px;margin-top:16px;overflow-x:auto;padding-bottom:8px}.round-card{min-width:200px;background:#1e293b;border-radius:8px;padding:12px;border:1px solid #334155;animation:popIn .3s ease}.round-card.win{border-color:#22c55e}.round-card.loss{border-color:#ef4444}.round-card.tie{border-color:#f59e0b}@keyframes popIn{0%{transform:scale(.8);opacity:0}to{transform:scale(1);opacity:1}}.round-header{font-size:.8rem;color:var(--text-muted);font-weight:700;text-transform:uppercase;margin-bottom:8px;text-align:center}.versus-box{display:flex;justify-content:space-around;align-items:center;margin:8px 0}.player-card{display:flex;flex-direction:column;align-items:center;gap:4px}.player-card .label{font-size:.7rem;color:var(--text-muted);font-weight:700}.vs{font-weight:900;color:#64748b;font-size:.9rem;margin:0 4px}.round-footer{text-align:center;font-size:.75rem;font-weight:800;padding-top:6px;border-top:1px solid #334155}.badge{font-size:.75rem;font-weight:800;padding:4px 8px;border-radius:4px}.badge.win{background:#15803d;color:#fff}.badge.loss{background:#b91c1c;color:#fff}.badge.tie{background:#b45309;color:#fff}.history-list{display:flex;flex-direction:column;gap:8px}.history-item{display:flex;justify-content:space-between;align-items:center;background:#0f172a;padding:12px 16px;border-radius:8px;border:1px solid #334155;cursor:pointer;transition:border-color .2s ease}.history-item:hover,.history-item.active{border-color:var(--accent-blue)}.login-box{max-width:400px;margin:100px auto;background:var(--panel-bg);padding:32px;border-radius:12px;border:1px solid #334155;text-align:center}.login-input{width:100%;padding:12px;border-radius:8px;border:1px solid #475569;background:#0f172a;color:#fff;font-size:1rem;margin:16px 0;box-sizing:border-box}.empty-state{color:var(--text-muted);font-style:italic;padding:20px;text-align:center}.tab-bar{display:flex;gap:8px;background:var(--panel-bg);padding:6px;border-radius:12px;border:1px solid #334155;margin-bottom:24px;overflow-x:auto}.tab-item{flex:1;min-width:120px;padding:10px 16px;background:transparent;color:var(--text-muted);border:none;border-radius:8px;cursor:pointer;font-weight:600;font-size:.9rem;transition:all .2s ease;white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;gap:6px}.tab-item:hover{background:#ffffff0d;color:var(--text-main)}.tab-item.active{background:#0f172a;color:var(--accent-blue);box-shadow:0 0 10px #38bdf833}.challenges-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.challenge-card{background:#0f172a;border-radius:10px;border:1px solid #334155;padding:16px;display:flex;flex-direction:column;gap:16px}.challenge-header{display:flex;justify-content:space-between;align-items:flex-start}.challenge-id{font-weight:700;color:var(--accent-purple);font-size:1.1rem}.challenge-owner{font-size:.8rem;color:var(--text-muted);margin-top:2px}.challenge-size{background:#334155;color:var(--text-main);font-size:.75rem;font-weight:700;padding:4px 8px;border-radius:6px}.challenge-cards-preview{background:#ffffff05;border-radius:8px;padding:10px;border:1px dashed #475569}.challenge-actions{margin-top:auto}.leaderboard-table{width:100%;border-collapse:collapse;text-align:left;margin-top:8px}.leaderboard-table th,.leaderboard-table td{padding:12px 16px;border-bottom:1px solid #334155}.leaderboard-table th{color:var(--accent-blue);font-weight:700;text-transform:uppercase;font-size:.8rem;letter-spacing:.05em}.leaderboard-table tr{transition:background .2s ease}.leaderboard-table tr:hover{background:#ffffff05}.leaderboard-table tr.row-me{background:#10b9810d}.leaderboard-table tr.row-me td{border-bottom-color:#10b98133}.active-participation{border-left:4px solid #10b981!important}.toast-notification{position:fixed;bottom:24px;right:24px;z-index:1100;width:340px;background:#0f172af2;border:1px solid rgba(245,158,11,.4);border-radius:12px;padding:16px;box-shadow:0 20px 25px -5px #000000b3,0 10px 10px -5px #000000b3;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);animation:toastSlideIn .3s cubic-bezier(.16,1,.3,1);color:#fff}@keyframes toastSlideIn{0%{transform:translateY(120px) scale(.9);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}