:root{--bg-app:#f4f5f7;--bg-sidebar:#fff;--bg-surface:#fff;--text-main:#1a1a1a;--text-muted:#666;--border-color:#e5e5e5;--primary:#007aff;--primary-light:#e6f2ff}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-app);color:var(--text-main);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}a{text-decoration:none}.app-layout{width:100%;min-height:100vh;display:flex}.sidebar{background-color:var(--bg-sidebar);border-right:1px solid var(--border-color);flex-direction:column;flex-shrink:0;width:260px;display:flex}.sidebar-logo{border-bottom:1px solid var(--border-color);align-items:center;gap:12px;padding:24px;display:flex}.logo-icon{color:var(--primary);font-size:24px}.logo-text{color:var(--text-main);letter-spacing:-.5px;font-size:18px;font-weight:700}.sidebar-nav{flex-direction:column;gap:8px;padding:24px 16px;display:flex}.nav-item{color:var(--text-muted);border-radius:8px;padding:12px 16px;font-size:15px;font-weight:500;transition:all .2s}.nav-item:hover{color:var(--text-main);background-color:#f9f9f9}.nav-item.active{background-color:var(--primary-light);color:var(--primary)}.main-content{flex:1;padding:40px;overflow-y:auto}.page-wrapper{max-width:900px;margin:0 auto}.page-title{color:var(--text-main);letter-spacing:-.5px;margin-bottom:24px;font-size:28px;font-weight:700}.info-alert{background-color:var(--primary-light);color:#0056b3;border:1px solid #b3d7ff;border-radius:8px;align-items:center;gap:8px;margin-bottom:24px;padding:16px;font-size:14px;display:flex}.info-alert b{font-size:16px}.btn{cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;width:100%;padding:12px 24px;font-size:15px;font-weight:500;transition:all .2s;display:inline-flex}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:#06c;box-shadow:0 4px 12px #007aff40}.btn-outline{color:var(--text-main);border:1px solid var(--border-color);background-color:#0000}.btn-outline:hover{background-color:#f9f9f9;border-color:#d1d1d1}.welcome-container{justify-content:center;align-items:center;min-height:65vh;display:flex}.welcome-card{background-color:var(--bg-surface);border:1px solid var(--border-color);text-align:center;border-radius:12px;width:100%;max-width:440px;padding:48px 40px;box-shadow:0 4px 20px #0000000a}.welcome-title{color:var(--text-main);letter-spacing:-.5px;margin-bottom:12px;font-size:24px;font-weight:700}.welcome-desc{color:var(--text-muted);margin-bottom:32px;font-size:15px;line-height:1.6}@media (max-width:768px){.app-layout{flex-direction:column}.sidebar{border-right:none;border-bottom:1px solid var(--border-color);width:100%}.sidebar-logo{padding:16px}.sidebar-nav{flex-direction:row;padding:12px 16px;overflow-x:auto}.nav-item{white-space:nowrap}.main-content{padding:24px 16px}}