:root{--color-bg: #ffffff;--color-bg-secondary: #f7f6f3;--color-bg-hover: #f1f1ef;--color-bg-active: #e8e7e4;--color-border: #e3e2de;--color-border-light: #ebebea;--color-divider: #e3e2de;--color-text-primary: #37352f;--color-text-secondary: #6b6b6b;--color-text-tertiary: #9b9a97;--color-text-placeholder: #b4b4b0;--color-accent: #2383e2;--color-accent-hover: #1b6ec2;--color-accent-bg: rgba(35, 131, 226, .08);--color-tag-green: #dbeddb;--color-tag-green-text: #1a7f37;--color-tag-blue: #d3e5ef;--color-tag-blue-text: #24548d;--color-tag-orange: #fadec9;--color-tag-orange-text: #9a5b13;--color-tag-purple: #e8deee;--color-tag-purple-text: #6940a5;--color-tag-gray: #e3e2de;--color-tag-gray-text: #55534e;--color-success: #2ea043;--color-warning: #d4a72c;--color-error: #cf222e;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", Helvetica, Arial, sans-serif;--font-mono: "SFMono-Regular", Menlo, Consolas, monospace;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: .9375rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.875rem;--font-size-3xl: 2.25rem;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--line-height: 1.5;--spacing-1: .25rem;--spacing-2: .5rem;--spacing-3: .75rem;--spacing-4: 1rem;--spacing-5: 1.25rem;--spacing-6: 1.5rem;--spacing-8: 2rem;--spacing-10: 2.5rem;--spacing-12: 3rem;--spacing-16: 4rem;--radius-sm: 4px;--radius-md: 6px;--radius-lg: 8px;--radius-xl: 12px;--radius-full: 9999px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 2px 8px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .12);--transition-fast: .1s ease;--transition-base: .2s ease;--max-content-width: 100%;--page-padding: 48px}*,*:before,*:after{box-sizing:border-box}body{margin:0;padding:0;font-family:var(--font-family);background-color:var(--color-bg);color:var(--color-text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:var(--line-height)}#root{min-height:100vh}a{color:var(--color-accent);text-decoration:none}a:hover{text-decoration:underline}::selection{background:var(--color-accent-bg);color:var(--color-text-primary)}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--color-bg-active);border-radius:5px;border:2px solid var(--color-bg)}::-webkit-scrollbar-thumb:hover{background:var(--color-text-tertiary)}.portal-page{max-width:var(--max-content-width);margin:0 auto;padding:var(--spacing-16) var(--page-padding)}@media(max-width:768px){.portal-page{padding:var(--spacing-8) var(--spacing-6)}}.portal-header{margin-bottom:var(--spacing-10)}.portal-header h1{font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);color:var(--color-text-primary);margin:0 0 var(--spacing-2) 0;letter-spacing:-.02em}.portal-header .subtitle{color:var(--color-text-secondary);font-size:var(--font-size-base);margin:0}.filter-bar{display:flex;gap:var(--spacing-4);margin-bottom:var(--spacing-8);flex-wrap:wrap;align-items:center}.search-wrapper{position:relative;flex:1;min-width:200px;max-width:400px}.search-wrapper svg{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--color-text-tertiary);pointer-events:none;width:16px;height:16px}.search-input{width:100%;padding:6px 10px 6px 32px;border-radius:var(--radius-md);background:var(--color-bg);border:1px solid var(--color-border);color:var(--color-text-primary);font-size:var(--font-size-sm);font-family:var(--font-family);transition:border-color var(--transition-fast)}.search-input::placeholder{color:var(--color-text-placeholder)}.search-input:focus{outline:none;border-color:var(--color-accent);box-shadow:0 0 0 2px var(--color-accent-bg)}.category-tabs{display:flex;gap:var(--spacing-1);flex-wrap:wrap}.category-tab{padding:4px 10px;border-radius:var(--radius-md);background:transparent;color:var(--color-text-secondary);font-size:var(--font-size-sm);font-weight:var(--font-weight-normal);cursor:pointer;transition:all var(--transition-fast);border:none;font-family:var(--font-family)}.category-tab:hover{background:var(--color-bg-hover);color:var(--color-text-primary)}.category-tab.active{background:var(--color-bg-active);color:var(--color-text-primary);font-weight:var(--font-weight-medium)}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:var(--spacing-4)}.tool-card{display:flex;flex-direction:column;padding:var(--spacing-5);background:var(--color-bg);border:1px solid var(--color-border-light);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-base);position:relative;text-decoration:none;box-shadow:var(--shadow-sm)}.tool-card:hover{background:var(--color-bg-secondary);box-shadow:var(--shadow-md);border-color:var(--color-border)}.tool-card:active{background:var(--color-bg-hover)}.tool-icon{font-size:1.5rem;width:42px;height:42px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-md);background:var(--color-bg-secondary);margin-bottom:var(--spacing-3);transition:background var(--transition-fast)}.tool-card:hover .tool-icon{background:var(--color-bg-hover)}.tool-card h3{margin:0 0 var(--spacing-1) 0;color:var(--color-text-primary);font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold)}.tool-card p{margin:0;color:var(--color-text-tertiary);font-size:var(--font-size-xs);line-height:1.5;flex-grow:1}.category-tag{font-size:11px;color:var(--color-tag-gray-text);background:var(--color-tag-gray);padding:2px 8px;border-radius:var(--radius-sm);font-weight:var(--font-weight-medium);width:fit-content;margin-top:var(--spacing-3)}.tool-card[data-category=env] .category-tag{background:var(--color-tag-green);color:var(--color-tag-green-text)}.tool-card[data-category=data] .category-tag{background:var(--color-tag-blue);color:var(--color-tag-blue-text)}.tool-card[data-category=general] .category-tag{background:var(--color-tag-orange);color:var(--color-tag-orange-text)}.tool-card[data-category=learning] .category-tag{background:var(--color-tag-purple);color:var(--color-tag-purple-text)}.status-badge{font-size:11px;color:var(--color-text-tertiary);background:var(--color-bg-secondary);padding:2px 8px;border-radius:var(--radius-sm);flex-shrink:0}.card-arrow{position:absolute;top:var(--spacing-4);right:var(--spacing-4);color:var(--color-text-tertiary);opacity:0;transition:opacity var(--transition-fast);display:flex;align-items:center}.card-arrow svg{width:16px;height:16px}.tool-card:hover .card-arrow{opacity:1}.tool-card.disabled{opacity:.5;cursor:default}.tool-card.disabled:hover{background:var(--color-bg)}.empty-state{text-align:center;padding:var(--spacing-16) var(--spacing-8);color:var(--color-text-tertiary)}.empty-state .icon{font-size:2rem;margin-bottom:var(--spacing-4)}