.st-page{height:calc(100vh - 56px);display:flex;flex-direction:column;background:var(--bg-primary);color:white;overflow:hidden}.st-header{height:var(--header-height);padding:0 1rem;display:flex;align-items:center;justify-content:space-between;background:var(--glass-bg);backdrop-filter:blur(var(--glass-blur));border-bottom:1px solid var(--glass-border);z-index:1000}.st-header-actions,.st-header-left{display:flex;gap:1rem}.st-back-btn,.st-header-left{align-items:center}.st-back-btn{display:flex;gap:.5rem;padding:.5rem .75rem;border-radius:8px;background:var(--glass-highlight);color:var(--text-secondary);text-decoration:none;transition:var(--transition-fast);border:1px solid var(--glass-border)}.st-back-btn:hover{background:var(--glass-hover);color:white}.st-title-group{display:flex;flex-direction:column}.st-title{font-weight:700;font-size:1.1rem}.st-subtitle{font-size:.75rem;color:var(--text-muted)}.st-main{flex:1;display:flex;overflow:hidden}.st-sidebar{width:320px;background:var(--bg-secondary);border-right:1px solid var(--glass-border);display:flex;flex-direction:column;padding:1.5rem;overflow-y:auto}.st-preview-area{flex:1;background:#000;position:relative;display:flex;align-items:center;justify-content:center}.st-card{background:var(--bg-tertiary);border:1px solid var(--glass-border);border-radius:12px;padding:1.25rem;margin-bottom:1.25rem}.st-card-title{font-size:.85rem;color:var(--text-secondary);margin-bottom:1rem}.st-btn-primary,.st-card-title{font-weight:600;display:flex;align-items:center;gap:.5rem}.st-btn-primary{width:100%;padding:.85rem;background:linear-gradient(135deg,var(--dev-color),#0d9488);border:none;border-radius:10px;color:white;cursor:pointer;justify-content:center;transition:var(--transition-smooth);box-shadow:0 4px 12px var(--dev-glow)}.st-btn-primary:hover:not(:disabled){transform:translateY(-2px);filter:brightness(1.1)}.st-btn-primary:disabled{opacity:.5;cursor:not-allowed;filter:grayscale(1)}.st-btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--glass-border);box-shadow:none}.st-btn-secondary:hover:not(:disabled){background:var(--glass-highlight);transform:translateY(-2px)}.st-empty-state{text-align:center;max-width:400px;flex-direction:column}.st-empty-state,.st-upload-icon{display:flex;align-items:center;justify-content:center}.st-upload-icon{width:64px;height:64px;border-radius:50%;background:var(--glass-highlight);margin:0 auto 1.5rem;color:var(--dev-color);border:1px solid var(--glass-border)}.st-progress-overlay{position:absolute;inset:0;background:rgba(0,0,0,.8);backdrop-filter:blur(8px);display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:50}.st-progress-bar{width:240px;height:6px;background:var(--bg-primary);border-radius:3px;overflow:hidden;margin-bottom:.5rem}.st-progress-fill{height:100%;background:var(--dev-color);transition:width .3s ease}@media (max-width:768px){.st-page{height:auto;min-height:calc(100vh - 56px);overflow-y:auto}.st-header{height:auto;flex-direction:column;align-items:stretch;padding:1rem;gap:1rem}.st-header-left{width:100%;justify-content:flex-start;gap:.75rem}.st-back-btn span{display:none}.st-back-btn{width:40px;height:40px;padding:0;justify-content:center;flex-shrink:0}.st-title{font-size:1rem;line-height:1.2}.st-subtitle{font-size:.7rem}.st-header-actions{width:100%}.st-header-actions .st-btn-primary{flex:1;font-size:.85rem;padding:.75rem}.st-main{flex-direction:column;height:auto;overflow:visible}.st-sidebar{width:100%;border-right:none;border-bottom:1px solid var(--glass-border);order:2;padding:1rem}.st-preview-area{height:400px;order:1;padding:1rem}.st-empty-state{padding:2rem 1rem;display:flex;flex-direction:column;align-items:center}.st-empty-state h3{font-size:1.5rem}.mobile-center-actions{display:flex;justify-content:center;width:100%;margin-top:2rem}}