:root{--color-primary: #2563eb;--color-primary-dark: #1e40af;--color-text: #1f2937;--color-text-muted: #6b7280;--color-text-light: #9ca3af;--color-bg: #ffffff;--color-bg-muted: #f9fafb;--color-border: #e5e7eb;--color-info-bg: #eff6ff;--color-info-text: #1e40af;--color-info-border: #2563eb;--color-warning-bg: #fef3c7;--color-warning-text: #78350f;--color-warning-border: #f59e0b;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--radius-sm: .25rem;--radius-md: .5rem;--spacing-xs: .5rem;--spacing-sm: 1rem;--spacing-md: 1.5rem;--spacing-lg: 2rem;--spacing-xl: 3rem}*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;color:var(--color-text);background-color:var(--color-bg);line-height:1.6;min-height:100vh;display:flex;flex-direction:column}h1{font-size:2.5rem;margin-bottom:1rem;color:var(--color-text);font-weight:700;line-height:1.2}h2{font-size:2rem;margin-bottom:1rem;color:var(--color-text);font-weight:600;line-height:1.3}h3{font-size:1.5rem;margin-bottom:.75rem;color:var(--color-text);font-weight:600;line-height:1.4}p{margin-bottom:1rem;color:var(--color-text-muted);line-height:1.7}ul,ol{margin-bottom:1.5rem;color:var(--color-text-muted);line-height:1.7;padding-left:1.5rem}li{margin-bottom:.5rem}a{color:var(--color-primary);text-decoration:none;transition:color .2s}a:hover{color:var(--color-primary-dark);text-decoration:underline}.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}header{border-bottom:1px solid var(--color-border);padding:var(--spacing-sm) var(--spacing-lg);background-color:var(--color-bg)}header h1{font-size:1.5rem;font-weight:700;color:var(--color-primary);margin:0}.header-link{text-decoration:none;color:inherit}.header-link:hover{text-decoration:none}main{flex:1;max-width:1200px;width:100%;margin:0 auto;padding:var(--spacing-lg)}footer{border-top:1px solid var(--color-border);padding:var(--spacing-md) var(--spacing-lg);text-align:center;color:var(--color-text-muted);font-size:.875rem;background-color:var(--color-bg)}.footer-link{color:inherit;text-decoration:underline}.page-intro{font-size:1.125rem;color:var(--color-text-muted);margin-bottom:var(--spacing-lg);line-height:1.7}.page-section{margin-top:var(--spacing-xl);padding-top:var(--spacing-lg);border-top:1px solid var(--color-border)}.hero-title{font-size:2.5rem;margin-bottom:.5rem;font-weight:700}.hero-subtitle{font-size:1.125rem;color:var(--color-text-muted);margin-bottom:var(--spacing-lg)}@media(max-width:768px){main{padding:var(--spacing-sm)}header{padding:var(--spacing-sm)}.hero-title,h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.25rem}}.tools-grid{list-style:none;display:grid;gap:var(--spacing-sm);padding:0;margin-bottom:var(--spacing-lg)}.tool-card{display:block;padding:var(--spacing-md);border:1px solid var(--color-border);border-radius:var(--radius-md);text-decoration:none;color:var(--color-text);transition:all .2s ease-in-out;background-color:var(--color-bg)}.tool-card:hover{border-color:var(--color-primary);box-shadow:var(--shadow-md);transform:translateY(-2px);text-decoration:none}.tool-card h3{font-size:1.25rem;margin-bottom:.5rem;color:var(--color-primary)}.tool-card p{color:var(--color-text-muted);font-size:.875rem;margin:0;line-height:1.5}.info-box{background-color:var(--color-info-bg);border-left:4px solid var(--color-info-border);padding:var(--spacing-sm);border-radius:var(--radius-sm);margin-bottom:var(--spacing-md)}.info-box-title{color:var(--color-info-text);font-weight:600;margin-bottom:.5rem;font-size:.95rem}.info-box-content{color:var(--color-primary-dark);font-size:.875rem;line-height:1.6;margin:0}.warning-box{background-color:var(--color-warning-bg);border-left:4px solid var(--color-warning-border);padding:var(--spacing-sm);border-radius:var(--radius-sm);margin-bottom:var(--spacing-md)}.warning-box-title{color:#92400e;font-weight:600;margin-bottom:.5rem;font-size:.95rem}.warning-box-content{color:var(--color-warning-text);font-size:.875rem;line-height:1.6;margin:0}.placeholder{padding:var(--spacing-xl);background-color:var(--color-bg-muted);border:2px dashed var(--color-border);border-radius:var(--radius-md);text-align:center;color:var(--color-text-muted)}.placeholder-title{font-size:1.125rem;margin-bottom:.5rem;font-weight:600}.placeholder-text{font-size:.875rem}textarea{width:100%;min-height:300px;padding:var(--spacing-sm);font-size:1rem;font-family:Monaco,Menlo,Ubuntu Mono,monospace;border:1px solid var(--color-border);border-radius:var(--radius-md);resize:vertical;outline:none;transition:border-color .2s,box-shadow .2s;background-color:var(--color-bg);color:var(--color-text)}textarea:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px #2563eb1a}textarea::placeholder{color:var(--color-text-light)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-sm);margin-top:var(--spacing-md)}.stat-card{padding:var(--spacing-md);background-color:var(--color-bg-muted);border-radius:var(--radius-md);border:1px solid var(--color-border);transition:transform .2s,box-shadow .2s}.stat-card:hover{transform:translateY(-1px);box-shadow:var(--shadow-sm)}.stat-label{font-size:.875rem;color:var(--color-text-muted);margin-bottom:.5rem;font-weight:500}.stat-value{font-size:2rem;font-weight:700;color:var(--color-primary);line-height:1}.token-counter-section{width:100%;margin-bottom:var(--spacing-lg)}@media(max-width:640px){.stats-grid{grid-template-columns:1fr}textarea{min-height:200px}}