:root{--primary:#1e3a8a;--primary-hover:#172554;--primary-light:#eff6ff;--accent:#d97706;--accent-hover:#b45309;--accent-light:#fef3c7;--success:#10b981;--success-bg:#d1fae5;--warning:#f59e0b;--warning-bg:#fef3c7;--error:#ef4444;--error-bg:#fee2e2;--info:#3b82f6;--info-bg:#dbeafe;--bg-body:#f8fafc;--bg-surface:#ffffff;--text-main:#0f172a;--text-muted:#64748b;--text-light:#94a3b8;--border-color:#e2e8f0;--sidebar-bg:#0f172a;--sidebar-text:#e2e8f0;--sidebar-hover:rgba(255,255,255,0.1);--sidebar-width:260px;--header-height:72px;--font-primary:'Be Vietnam Pro','Inter',system-ui,sans-serif;--space-1:0.25rem;--space-2:0.5rem;--space-3:0.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--radius-sm:6px;--radius-md:12px;--radius-lg:18px;--radius-full:9999px;--shadow-sm:0 1px 2px 0 rgba(0,0,0,0.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.1),0 2px 4px -1px rgba(0,0,0,0.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.1),0 4px 6px -2px rgba(0,0,0,0.05);--shadow-hover:0 20px 25px -5px rgba(0,0,0,0.1),0 10px 10px -5px rgba(0,0,0,0.04);--transition-fast:0.15s ease-in-out;--transition-normal:0.3s cubic-bezier(0.4,0,0.2,1)}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-primary);background-color:var(--bg-body);color:var(--text-main);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{text-decoration:none;color:var(--primary);transition:color var(--transition-fast)}a:hover{color:var(--primary-hover)}ul,ol{list-style:none}img,picture,video,canvas,svg{display:block;max-width:100%}input,button,textarea,select{font:inherit;outline:none}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.2;margin-bottom:var(--space-4);color:var(--text-main)}p{margin-bottom:var(--space-4);color:var(--text-muted)}.text-center{text-align:center}.text-right{text-align:right}.text-primary{color:var(--primary)}.text-muted{color:var(--text-muted)}.text-sm{font-size:0.875rem}.font-semibold{font-weight:600}.font-bold{font-weight:700}.mb-2{margin-bottom:var(--space-2)}.mb-4{margin-bottom:var(--space-4)}.mb-6{margin-bottom:var(--space-6)}.mt-4{margin-top:var(--space-4)}.flex{display:flex}.items-center{align-items:center}.justify-between{justify-content:space-between}.justify-center{justify-content:center}.gap-2{gap:var(--space-2)}.gap-4{gap:var(--space-4)}.grid{display:grid}.d-none{display:none !important}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:0.625rem 1.25rem;border-radius:var(--radius-sm);font-weight:600;font-size:0.95rem;border:1px solid transparent;cursor:pointer;transition:all var(--transition-fast);white-space:nowrap}.btn:focus-visible{box-shadow:0 0 0 3px var(--primary-light)}.btn:disabled{opacity:0.6;cursor:not-allowed}.btn-primary{background-color:var(--primary);color:#fff;border-color:var(--primary)}.btn-primary:hover:not(:disabled){background-color:var(--primary-hover);border-color:var(--primary-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-accent{background-color:var(--accent);color:#fff;border-color:var(--accent)}.btn-accent:hover:not(:disabled){background-color:var(--accent-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-outline{background-color:transparent;color:var(--text-main);border-color:var(--border-color)}.btn-outline:hover:not(:disabled){background-color:var(--bg-body);border-color:var(--text-muted)}.btn-ghost{background-color:transparent;color:var(--text-muted)}.btn-ghost:hover:not(:disabled){background-color:var(--bg-body);color:var(--primary)}.btn-sm{padding:0.375rem 0.75rem;font-size:0.875rem}.btn-lg{padding:0.875rem 1.75rem;font-size:1.05rem}.form-group{margin-bottom:var(--space-4)}.form-label{display:block;font-weight:600;font-size:0.875rem;margin-bottom:var(--space-2);color:var(--text-main)}.form-control{width:100%;padding:0.625rem 1rem;border:1px solid var(--border-color);border-radius:var(--radius-sm);background-color:var(--bg-surface);color:var(--text-main);font-size:0.95rem;transition:all var(--transition-fast)}.form-control:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}.form-control::placeholder{color:var(--text-light)}.card{background-color:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);overflow:hidden;transition:box-shadow var(--transition-fast)}.card:hover{box-shadow:var(--shadow-md)}.card-header{padding:var(--space-4) var(--space-5);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between}.card-title{margin:0;font-size:1.125rem}.card-body{padding:var(--space-5)}.card-footer{padding:var(--space-4) var(--space-5);border-top:1px solid var(--border-color);background-color:var(--bg-body)}.badge{display:inline-flex;align-items:center;padding:0.125rem 0.625rem;border-radius:var(--radius-full);font-size:0.75rem;font-weight:600;line-height:1.5}.badge-primary{background-color:var(--primary-light);color:var(--primary)}.badge-success{background-color:var(--success-bg);color:var(--success)}.badge-warning{background-color:var(--warning-bg);color:var(--warning)}.badge-error{background-color:var(--error-bg);color:var(--error)}.badge-neutral{background-color:var(--bg-body);color:var(--text-muted);border:1px solid var(--border-color)}.modal{display:none;position:fixed;inset:0;z-index:1050;align-items:center;justify-content:center}.modal.show{display:flex}.modal-overlay{position:absolute;inset:0;background:rgba(15,23,42,0.6);backdrop-filter:blur(4px)}.modal-content{position:relative;background:var(--bg-surface);border-radius:var(--radius-md);width:100%;max-width:500px;margin:var(--space-4);box-shadow:var(--shadow-lg);z-index:1;animation:modalIn 0.2s ease-out;max-height:calc(100vh - 40px);display:flex;flex-direction:column}.modal-header{padding:var(--space-4) var(--space-5);border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center}.modal-title{font-size:1.25rem;font-weight:700;margin:0;color:var(--text-main)}.modal-close-btn{background:transparent;border:none;font-size:1.5rem;line-height:1;cursor:pointer;color:var(--text-muted);transition:color var(--transition-fast);padding:0}.modal-close-btn:hover{color:var(--error)}.modal-body{padding:var(--space-5);overflow-y:auto}@keyframes modalIn{from{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.app-layout{display:flex;min-height:100vh}.sidebar{position:fixed;top:0;bottom:0;left:0;width:var(--sidebar-width);background-color:var(--sidebar-bg);color:var(--sidebar-text);z-index:100;transition:transform var(--transition-normal);display:flex;flex-direction:column;overflow:hidden}.sidebar-header{height:var(--header-height);display:flex;align-items:center;padding:0 var(--space-5);border-bottom:1px solid rgba(255,255,255,0.1)}.sidebar-brand{display:flex;align-items:center;gap:var(--space-3);color:#fff;font-weight:700;font-size:1.25rem}.sidebar-brand-icon{width:32px;height:32px;background-color:var(--accent);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:#fff}.sidebar-menu{flex:1;overflow-y:auto;padding:var(--space-4) 0;scrollbar-width:none;-ms-overflow-style:none}.sidebar-menu::-webkit-scrollbar{display:none}.sidebar-menu-title{padding:0 var(--space-5);margin-bottom:var(--space-2);font-size:0.75rem;text-transform:uppercase;letter-spacing:0.05em;color:var(--text-muted);font-weight:600}.sidebar-item{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-5);color:var(--sidebar-text);transition:all var(--transition-fast);border-left:3px solid transparent}.sidebar-item:hover,.sidebar-item.active{background-color:var(--sidebar-hover);color:#fff}.sidebar-item.active{border-left-color:var(--accent);background-color:rgba(255,255,255,0.05)}.sidebar-item i{width:20px;text-align:center}.sidebar-footer{padding:var(--space-5);border-top:1px solid rgba(255,255,255,0.1)}.user-profile{display:flex;align-items:center;gap:var(--space-3)}.avatar{width:36px;height:36px;border-radius:50%;background-color:var(--primary);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;font-size:0.875rem}.user-info strong{display:block;font-size:0.875rem;color:#fff}.user-info span{display:block;font-size:0.75rem;color:var(--text-muted)}.main-content{flex:1;margin-left:var(--sidebar-width);display:flex;flex-direction:column;min-height:100vh}.topbar{height:var(--header-height);background-color:var(--bg-surface);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 var(--space-6);position:sticky;top:0;z-index:90}.topbar-left{display:flex;align-items:center;gap:var(--space-4)}.sidebar-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text-muted)}.search-bar{position:relative;width:300px}.search-bar i{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text-light)}.search-bar input{padding-left:36px;border-radius:var(--radius-full)}.topbar-right{display:flex;align-items:center;gap:var(--space-4)}.icon-btn{background:none;border:none;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-muted);transition:background var(--transition-fast);position:relative}.icon-btn:hover{background-color:var(--bg-body);color:var(--primary)}.notification-badge{position:absolute;top:8px;right:8px;width:8px;height:8px;background-color:var(--error);border-radius:50%}.page-content{padding:var(--space-6);flex:1}.page-header{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:var(--space-6)}.page-title{margin:0;font-size:1.75rem}.page-description{margin:var(--space-2) 0 0 0;font-size:1rem}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--space-4);margin-bottom:var(--space-8)}.stat-card{display:flex;align-items:center;gap:var(--space-4)}.stat-icon{width:48px;height:48px;border-radius:var(--radius-md);background-color:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center}.stat-icon i{font-size:1.25rem}.stat-info span{display:block;font-size:0.875rem;color:var(--text-muted)}.stat-info strong{display:block;font-size:1.5rem;font-weight:800;color:var(--text-main);line-height:1.2;margin-top:4px}.stat-info small{display:flex;align-items:center;gap:4px;font-size:0.75rem;margin-top:4px}.tools-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-6)}.tool-card{position:relative;display:flex;flex-direction:column;height:100%}.tool-icon{width:56px;height:56px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;margin-bottom:var(--space-4);color:#fff;font-size:1.5rem}.tool-badge{position:absolute;top:var(--space-4);right:var(--space-5)}.tool-desc{font-size:0.875rem;color:var(--text-muted);flex:1}.tool-meta{display:flex;flex-wrap:wrap;gap:var(--space-2);margin-top:var(--space-4);margin-bottom:var(--space-6)}.tool-action{width:100%}.bg-gradient-green{background:linear-gradient(135deg,#10b981,#059669)}.bg-gradient-yellow{background:linear-gradient(135deg,#f59e0b,#d97706)}.bg-gradient-blue{background:linear-gradient(135deg,#3b82f6,#2563eb)}.bg-gradient-purple{background:linear-gradient(135deg,#8b5cf6,#6d28d9)}.bg-gradient-red{background:linear-gradient(135deg,#ef4444,#dc2626)}.bg-gradient-orange{background:linear-gradient(135deg,#f97316,#ea580c)}.bg-gradient-cyan{background:linear-gradient(135deg,#06b6d4,#0891b2)}.bg-gradient-pink{background:linear-gradient(135deg,#ec4899,#db2777)}.hero-section{padding:80px 0;text-align:center;background-color:var(--bg-surface)}.hero-title{font-size:3rem;font-weight:800;max-width:800px;margin:0 auto var(--space-6);letter-spacing:-0.02em}.hero-subtitle{font-size:1.25rem;max-width:600px;margin:0 auto var(--space-8)}@media (max-width:1200px){.tools-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width:992px){.stats-grid{grid-template-columns:repeat(2,1fr)}.sidebar{transform:translateX(-100%)}.sidebar.show{transform:translateX(0);box-shadow:var(--shadow-lg)}.main-content{margin-left:0}.sidebar-toggle{display:block}}@media (max-width:768px){.tools-grid{grid-template-columns:1fr}.stats-grid{grid-template-columns:1fr}.page-header{flex-direction:column;align-items:flex-start;gap:var(--space-4)}.search-bar{width:200px}}@media (max-width:576px){.topbar{padding:0 var(--space-4)}.page-content{padding:var(--space-4)}.search-bar{display:none}}.tool-layout-grid{display:grid;grid-template-columns:1fr 350px;gap:24px}.tool-layout-grid-sidebar-left{display:grid;grid-template-columns:350px 1fr;gap:24px}@media (max-width:992px){.tool-layout-grid,.tool-layout-grid-sidebar-left{grid-template-columns:1fr !important;gap:16px !important}}