*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#ffffff;--surface:#f7f6f3;--surface-hover:#efedea;--border:#e3e2de;--text:#37352f;--text-muted:#9b9a97;--primary:#2eaadc;--primary-hover:#2496c4;--primary-bg:rgba(46,170,220,.08);--success:#0f7b6c;--success-bg:rgba(15,123,108,.08);--danger:#e03e3e;--sending:#6c5ce7;--sending-bg:rgba(108,92,231,.08);--radius:8px;--shadow:0 1px 3px rgba(0,0,0,.04),0 1px 2px rgba(0,0,0,.06);--shadow-lg:0 4px 12px rgba(0,0,0,.08)}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','Noto Sans',Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;display:flex;justify-content:center;align-items:center;-webkit-font-smoothing:antialiased}
.container{width:100%;max-width:420px;padding:32px 24px;position:relative}
header{text-align:center;margin-bottom:48px}
header h1{font-size:1.75rem;font-weight:700;color:var(--text);letter-spacing:-.02em}
.subtitle{color:var(--text-muted);margin-top:6px;font-size:.875rem}
.screen{display:none}.screen.active{display:block}
.lobby-actions{display:flex;flex-direction:column;gap:20px;align-items:center}
.btn{padding:10px 20px;border:none;border-radius:var(--radius);font-size:.875rem;font-weight:500;cursor:pointer;transition:all .15s ease;font-family:inherit;line-height:1.4}
.btn-primary{background:var(--primary);color:#fff;width:100%;padding:12px 20px;font-size:.9375rem;box-shadow:var(--shadow)}.btn-primary:hover{background:var(--primary-hover)}.btn-primary:active{transform:scale(.98)}
.btn-secondary{background:var(--bg);color:var(--text);border:1px solid var(--border);box-shadow:var(--shadow)}.btn-secondary:hover{background:var(--surface)}
.btn-sm{padding:8px 16px;font-size:.8125rem;cursor:pointer}
.btn-icon{background:none;border:none;border-radius:6px;padding:6px;cursor:pointer;color:var(--text-muted);transition:all .15s;display:flex;align-items:center;justify-content:center}.btn-icon:hover{color:var(--text);background:var(--surface)}
.divider{display:flex;align-items:center;width:100%;gap:16px;color:var(--text-muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.05em}.divider::before,.divider::after{content:'';flex:1;height:1px;background:var(--border)}
.join-form{display:flex;gap:8px;width:100%}
.join-form input{flex:1;min-width:0;padding:10px 12px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-size:1rem;font-family:'SF Mono',SFMono-Regular,Consolas,monospace;letter-spacing:3px;text-align:center;text-transform:uppercase;outline:none;transition:all .15s;box-shadow:var(--shadow)}.join-form input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-bg)}.join-form input::placeholder{letter-spacing:0;font-family:inherit;font-size:.8125rem;color:var(--text-muted)}
.join-form .btn{white-space:nowrap;flex-shrink:0;padding:10px 16px}
.room-info{text-align:center}
.room-info>p:first-child{font-size:.8125rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;font-weight:500}
.code-display{display:flex;align-items:center;justify-content:center;gap:10px;margin:12px 0 16px}
.code-display span{font-size:2rem;font-weight:700;font-family:'SF Mono',SFMono-Regular,Consolas,monospace;letter-spacing:6px;color:var(--text)}
.hint{color:var(--text-muted);font-size:.8125rem}
.loader{width:32px;height:32px;border:2.5px solid var(--border);border-top-color:var(--primary);border-radius:50%;margin:28px auto 12px;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.waiting-text{color:var(--text-muted);font-size:.8125rem}
.connection-status{display:flex;align-items:center;gap:8px;margin-bottom:20px;padding:8px 12px;background:var(--success-bg);border-radius:var(--radius);font-size:.8125rem;color:var(--success);font-weight:500}
.status-dot{width:7px;height:7px;background:var(--success);border-radius:50%;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.room-code-small{margin-left:auto;color:var(--text-muted);font-family:'SF Mono',SFMono-Regular,Consolas,monospace;font-size:.75rem;font-weight:400}
.drop-zone{border:1.5px dashed var(--border);border-radius:var(--radius);padding:40px 24px;text-align:center;transition:all .2s;cursor:pointer;background:var(--surface)}.drop-zone p{color:var(--text-muted);margin-bottom:6px;font-size:.875rem}.drop-zone .hint{font-size:.75rem;margin-bottom:8px}.drop-zone.dragover{border-color:var(--primary);background:var(--primary-bg)}
.transfers-list{margin-top:20px;display:flex;flex-direction:column;gap:8px}
.transfer-item{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:14px;display:flex;flex-direction:column;gap:8px;transition:border-color .2s}
.transfer-item.completed{border-color:var(--success)}
.transfer-header{display:flex;align-items:center;gap:10px}
.transfer-icon{width:32px;height:32px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:1rem;font-weight:700;flex-shrink:0}
.transfer-icon.sending{background:var(--sending-bg);color:var(--sending)}
.transfer-icon.receiving{background:var(--primary-bg);color:var(--primary)}
.transfer-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:1px}
.transfer-name{font-weight:500;font-size:.8125rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.transfer-meta{font-size:.6875rem;color:var(--text-muted)}
.transfer-percent{font-size:.8125rem;font-weight:600;color:var(--text);flex-shrink:0;min-width:36px;text-align:right}
.transfer-percent.done{color:var(--success)}
.transfer-progress{width:100%;height:4px;background:var(--surface);border-radius:2px;overflow:hidden}
.transfer-progress-bar{height:100%;background:var(--primary);border-radius:2px;transition:width .2s;width:0%}
.transfer-progress-bar.complete{background:var(--success)}
.transfer-footer{display:flex;justify-content:space-between;font-size:.6875rem;color:var(--text-muted)}
.transfer-speed{font-weight:500}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(80px);background:var(--text);color:var(--bg);padding:10px 20px;border-radius:var(--radius);font-size:.8125rem;transition:transform .25s ease;z-index:100;white-space:nowrap;box-shadow:var(--shadow-lg);font-weight:500}.toast.show{transform:translateX(-50%) translateY(0)}.toast.error{background:var(--danger);color:#fff}
@media(max-width:520px){.container{padding:24px 16px}header{margin-bottom:36px}header h1{font-size:1.5rem}.code-display span{font-size:1.75rem;letter-spacing:4px}.drop-zone{padding:28px 16px}.join-form input{padding:10px 8px;letter-spacing:2px}.join-form .btn{padding:10px 12px}}