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#e6f0ff;--text-dark: #1e293b;--text-light: #64748b;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .08);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08)}body{font-family:Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;margin:0;padding:0;background-color:#f4f6f9;color:var(--text-dark)}h1,h2,h3{color:#1e293b;margin-top:0}button{cursor:pointer}.card-panel{background:#fff;border-radius:10px;box-shadow:var(--shadow-sm);padding:24px;margin-bottom:20px;border:1px solid #e2e8f0}.app-container{display:flex;flex-direction:column;min-height:100vh}.app-main{flex:1}.auth-loading{display:flex;flex-direction:column;justify-content:center;align-items:center;height:100vh;gap:16px;color:var(--text-light)}.auth-spinner{width:36px;height:36px;border:3px solid #e2e8f0;border-top-color:var(--primary-color);border-radius:50%;animation:authSpin .7s linear infinite}@keyframes authSpin{to{transform:rotate(360deg)}}.landing-page{flex:1;display:flex;justify-content:center;align-items:center;background:linear-gradient(135deg,#0f172a,#1e3a5f,#0c4a6e);padding:2rem;min-height:calc(100vh - 140px)}.landing-content{max-width:720px;background:#ffffff0f;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);padding:3.5rem 3rem;border-radius:20px;border:1px solid rgba(255,255,255,.12);box-shadow:0 8px 32px #0000004d;text-align:center;color:#fff;animation:fadeIn .8s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.landing-content h1{font-size:2.5rem;margin-bottom:1rem;color:#fff;font-weight:800;line-height:1.2}.landing-content>p{font-size:1.1rem;line-height:1.6;color:#cbd5e1;margin-bottom:2rem}.landing-features{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:2rem;text-align:left}.landing-feature{background:#ffffff0f;border:1px solid rgba(255,255,255,.1);border-radius:10px;padding:16px;display:flex;flex-direction:column;gap:6px}.landing-feature strong{color:#93c5fd;font-size:.9rem}.landing-feature span{color:#94a3b8;font-size:.82rem;line-height:1.4}.landing-content .login-hint{font-size:.95rem;color:#64748b;font-weight:500;margin-top:1rem;margin-bottom:0}.floating-ai-btn{position:fixed;bottom:24px;right:24px;background:#0056b3;color:#fff;width:48px;height:48px;border-radius:50%;text-decoration:none;font-weight:700;font-size:14px;box-shadow:0 4px 14px #0056b359;z-index:1000;transition:transform .2s,box-shadow .2s;display:flex;align-items:center;justify-content:center}.floating-ai-btn:hover{transform:translateY(-2px) scale(1.05);box-shadow:0 6px 20px #0056b373}@media(max-width:640px){.landing-content{padding:2rem 1.5rem}.landing-content h1{font-size:1.8rem}.landing-features{grid-template-columns:1fr}.floating-ai-btn{bottom:16px;right:16px;width:44px;height:44px;font-size:12px}}