.app-container{font-family:-apple-system,Inter,PingFang SC,system-ui,sans-serif;background-color:#f7f8fa;color:#1f2937;min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:20px;box-sizing:border-box}.app-header{width:100%;max-width:800px;display:flex;justify-content:space-between;align-items:center;padding:15px 25px;background-color:#fff;border-radius:12px;box-shadow:0 2px 8px #0000000d;margin-bottom:20px;border:1px solid #e5e7eb}.app-title{font-size:24px;font-weight:700;color:#1f2937;margin:0;display:flex;align-items:center;gap:8px}.app-title .cloud-icon{font-size:18px;color:#9ca3af}.main-nav{display:flex;gap:10px}.nav-button{background-color:transparent;border:none;padding:8px 15px;border-radius:8px;cursor:pointer;font-size:15px;font-weight:500;color:#6b7280;transition:background-color .2s ease,color .2s ease;display:flex;align-items:center;gap:6px}.nav-button:hover{background-color:#e0e7ff;color:#6366f1}.nav-button.active{background-color:#6366f1;color:#fff;box-shadow:0 2px 5px #6366f14d}.nav-button.active svg{color:#fff}.app-main{width:100%;max-width:800px;background-color:#fff;border-radius:12px;box-shadow:0 2px 8px #0000000d;padding:30px;border:1px solid #e5e7eb;min-height:500px;position:relative;overflow:hidden}.home-page{display:flex;flex-direction:column;gap:25px;position:relative;min-height:400px}.loading-indicator{text-align:center;font-size:16px;color:#9ca3af;margin-bottom:20px;padding:20px;background-color:#f0f4ff;border-radius:8px;border:1px solid #d1d5db}.topic-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px;z-index:1}.topic-card{background-color:#f9fafb;border:1px solid #e5e7eb;border-radius:10px;padding:20px;display:flex;flex-direction:column;align-items:center;text-align:center;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease;box-shadow:0 1px 3px #0000000a;position:relative;overflow:hidden}.topic-card:hover{box-shadow:0 4px 12px #00000014}.card-emoji{font-size:48px;margin-bottom:10px;line-height:1}.card-title{font-size:18px;font-weight:600;color:#1f2937;margin-bottom:8px;line-height:1.3}.card-description{font-size:14px;color:#6b7280;line-height:1.5;margin:0}.home-stars-background{position:absolute;top:0;left:0;width:100%;height:100%;overflow:hidden;pointer-events:none;z-index:0;opacity:.3}.detail-page{display:flex;flex-direction:column;gap:20px;align-items:flex-start}.back-button{background-color:#f0f4ff;color:#6366f1;border:1px solid #a5b4fc;padding:8px 15px;border-radius:8px;cursor:pointer;font-size:14px;font-weight:500;display:flex;align-items:center;gap:6px;transition:background-color .2s ease,color .2s ease,box-shadow .2s ease}.back-button:hover{background-color:#e0e7ff;box-shadow:0 2px 5px #6366f133}.detail-title{font-size:28px;font-weight:700;color:#1f2937;margin-top:10px;margin-bottom:0}.detail-image-container{width:100%;height:300px;background-color:#e5e7eb;border-radius:10px;overflow:hidden;display:flex;justify-content:center;align-items:center;box-shadow:0 4px 10px #00000014}.detail-image{width:100%;height:100%;object-fit:cover;display:block}.image-placeholder{font-size:20px;color:#9ca3af;display:flex;justify-content:center;align-items:center;width:100%;height:100%;background-color:#f0f4ff;border:1px dashed #a5b4fc;border-radius:8px}.image-placeholder.loading{font-size:16px;color:#6366f1}.image-placeholder.fallback-emoji{font-size:60px}.detail-description{font-size:16px;color:#374151;line-height:1.6;margin-bottom:20px}.like-button{background-color:#ff6b6b;color:#fff;border:none;padding:12px 25px;border-radius:8px;cursor:pointer;font-size:18px;font-weight:600;display:flex;align-items:center;gap:10px;box-shadow:0 4px 10px #ff6b6b66;transition:background-color .2s ease,transform .1s ease}.like-button:hover{background-color:#ff4757}.like-button svg{color:#fff}.about-page{display:flex;flex-direction:column;align-items:center;text-align:center;gap:25px}.about-title{font-size:28px;font-weight:700;color:#1f2937;margin-bottom:10px}.about-content{background-color:#f9fafb;border:1px solid #e5e7eb;border-radius:10px;padding:30px;max-width:600px;box-shadow:0 1px 3px #0000000a}.avatar{width:120px;height:120px;margin:0 auto 20px;border-radius:50%;overflow:hidden;background-color:#e0e7ff;border:3px solid #a5b4fc;display:flex;align-items:center;justify-content:center}.avatar-svg{width:100%;height:100%}.about-text{font-size:16px;color:#374151;line-height:1.6;margin:0}@media (max-width: 600px){.app-header{flex-direction:column;gap:15px;padding:15px}.app-title{font-size:20px}.main-nav{width:100%;justify-content:space-around}.nav-button{flex:1;text-align:center;justify-content:center;padding:10px 0}.app-main{padding:20px}.topic-grid{grid-template-columns:1fr}.detail-title{font-size:24px}.detail-image-container{height:250px}.like-button{width:100%;justify-content:center}}