:root { --primary:#6366f1; --secondary:#8b5cf6; --bg-light:#f8fafc; --text-dark:#1e293b; --text-light:#64748b; --border:#e2e8f0; }
*{margin:0;padding:0;box-sizing:border-box} body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);min-height:100vh;color:var(--text-dark)}
#loading-screen{position:fixed;inset:0;background:linear-gradient(135deg,#6366f1 0%,#8b5cf6 100%);display:flex;align-items:center;justify-content:center;z-index:10000;opacity:1;transition:opacity .6s ease-out}
#loading-screen.hide{opacity:0;pointer-events:none}.loading-content{text-align:center;color:#fff}.loading-logo{width:80px;height:80px;margin:0 auto 24px;position:relative}
.loading-logo::before,.loading-logo::after{content:'';position:absolute;border-radius:50%;border:3px solid rgba(255,255,255,.3)}
.loading-logo::before{inset:0;border-top-color:#fff;animation:spin 1s linear infinite}.loading-logo::after{inset:15px;border-top-color:#fff;animation:spin 1.5s linear infinite reverse}
@keyframes spin{to{transform:rotate(360deg)}}#app-content{opacity:0;transition:opacity .6s ease-in}#app-content.show{opacity:1}
.app-container{max-width:1200px;margin:0 auto;padding:20px;min-height:100vh;display:flex;flex-direction:column;gap:20px}
.app-header{text-align:center;padding:30px 20px;color:#fff}.app-logo{display:inline-flex;align-items:center;gap:12px;margin-bottom:16px}
.logo-icon{width:48px;height:48px;background:#fff;border-radius:12px;display:flex;align-items:center;justify-content:center}.app-logo h1{font-size:2.5em;font-weight:800}
.app-tagline{opacity:.95;margin-bottom:12px}.app-features{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}.feature-badge{background:rgba(255,255,255,.2);backdrop-filter:blur(10px);padding:8px 16px;border-radius:20px}
.main-card{background:#fff;border-radius:24px;padding:32px;box-shadow:0 20px 40px rgba(0,0,0,.2);max-width:600px;margin:0 auto;width:100%}
.tab-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:32px;background:var(--bg-light);padding:6px;border-radius:16px}
.tab-button{padding:14px 24px;border:none;background:transparent;color:var(--text-light);font-weight:600;border-radius:12px;cursor:pointer}
.tab-button.active{background:#fff;color:var(--primary);box-shadow:0 1px 3px rgba(0,0,0,.1)}.tab-content{display:none}.tab-content.active{display:block}
.file-drop-zone{border:2px dashed var(--border);border-radius:16px;padding:48px 24px;text-align:center;background:var(--bg-light);margin-bottom:24px;cursor:pointer}
.drop-icon{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:20px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:2em}
.file-list{max-height:300px;overflow-y:auto;margin-bottom:24px}.file-item{display:flex;align-items:center;gap:16px;padding:16px;background:var(--bg-light);border-radius:12px;margin-bottom:12px}
.file-icon{width:48px;height:48px;background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.5em}
.btn{padding:16px 32px;border:none;border-radius:12px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;width:100%}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff}.btn-secondary{background:var(--bg-light);color:var(--text-dark)}
.qr-section{text-align:center;padding:32px;background:var(--bg-light);border-radius:16px;margin-bottom:24px}
.connection-code{font-size:2em;font-weight:800;letter-spacing:.2em;color:var(--primary);font-family:'Courier New',monospace;background:#fff;padding:20px;border-radius:12px;margin:20px 0}
.progress-section{padding:24px;background:var(--bg-light);border-radius:16px;margin-top:24px}
.progress-bar-container{height:12px;background:var(--border);border-radius:10px;overflow:hidden;margin-bottom:12px}.progress-bar{height:100%;background:linear-gradient(90deg,var(--primary),var(--secondary))}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#fff;padding:16px 24px;border-radius:12px;box-shadow:0 20px 40px rgba(0,0,0,.2);display:flex;align-items:center;gap:12px;z-index:10001;max-width:90%}
.toast.success{border-left:4px solid #10b981}.toast.error{border-left:4px solid #ef4444}.toast.info{border-left:4px solid var(--primary)}.toast.warning{border-left:4px solid #f59e0b}
.hidden{display:none!important}