:root{--primary: #0ea5e9;--primary-dark: #0284c7;--secondary: #10b981;--background: #0f172a;--surface: #1e293b;--surface-hover: #334155;--text: #f8fafc;--text-secondary: #94a3b8;--border: #334155;--border-light: #475569;--error: #ef4444;--success: #10b981;--warning: #f59e0b;--radius: .5rem;--shadow: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--transition: all .3s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Noto Sans SC,sans-serif;background:var(--background);color:var(--text);line-height:1.6;overflow-x:hidden}#root{min-height:100vh;display:flex;flex-direction:column}.container{max-width:1200px;margin:0 auto;padding:0 1rem}.header{background:linear-gradient(135deg,var(--surface) 0%,var(--background) 100%);border-bottom:1px solid var(--border);box-shadow:var(--shadow);position:sticky;top:0;z-index:100}.header-content{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 0}.logo{font-size:1.5rem;font-weight:700;background:linear-gradient(90deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;display:flex;align-items:center;gap:.5rem}.logo-icon{width:32px;height:32px;background:var(--primary);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700}.nav{display:flex;gap:1.5rem;align-items:center}.nav-link{color:var(--text-secondary);text-decoration:none;font-weight:500;transition:var(--transition);position:relative}.nav-link:hover{color:var(--text)}.nav-link:after{content:"";position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--primary);transition:var(--transition)}.nav-link:hover:after{width:100%}.main{flex:1;padding:3rem 0}.hero{text-align:center;margin-bottom:4rem;position:relative;overflow:hidden}.hero:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 50% 50%,rgba(14,165,233,.1) 0%,transparent 50%);pointer-events:none}.hero-title{font-size:3rem;font-weight:700;margin-bottom:1rem;background:linear-gradient(90deg,var(--text),var(--primary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:1.25rem;color:var(--text-secondary);max-width:600px;margin:0 auto 2rem}.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:2rem;margin-top:4rem;margin-bottom:4rem}.feature-card{background:var(--surface);padding:2rem;border-radius:var(--radius);border:1px solid var(--border);transition:var(--transition);position:relative;overflow:hidden}.feature-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary),var(--secondary))}.feature-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:var(--primary)}.feature-icon{width:48px;height:48px;background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:1rem;font-size:1.5rem}.feature-title{font-size:1.25rem;font-weight:600;margin-bottom:.5rem}.feature-description{color:var(--text-secondary)}.converter{background:var(--surface);border-radius:var(--radius);border:1px solid var(--border);padding:2rem;box-shadow:var(--shadow);position:relative;overflow:hidden}.converter:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 50% 50%,rgba(14,165,233,.05) 0%,transparent 50%);pointer-events:none}.converter-header{text-align:center;margin-bottom:2rem}.converter-title{font-size:1.75rem;font-weight:600;margin-bottom:.5rem}.converter-description{color:var(--text-secondary)}.converter-content{display:grid;grid-template-columns:1fr;gap:2rem;margin-bottom:2rem}@media (min-width: 768px){.converter-content{grid-template-columns:1fr 1fr}}.input-section,.output-section{display:flex;flex-direction:column;gap:1rem}.section-header{display:flex;justify-content:space-between;align-items:center}.section-title{font-size:1.125rem;font-weight:600}.char-count{color:var(--text-secondary);font-size:.875rem}.textarea{flex:1;min-height:200px;padding:1rem;background:var(--background);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-family:inherit;font-size:1rem;line-height:1.5;resize:vertical;transition:var(--transition)}.textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #0ea5e91a}.actions{display:flex;flex-direction:column;gap:1rem;margin-bottom:2rem}@media (min-width: 768px){.actions{flex-direction:row;justify-content:center}}.btn{padding:.75rem 1.5rem;border:none;border-radius:var(--radius);font-size:1rem;font-weight:600;cursor:pointer;transition:var(--transition);display:flex;align-items:center;justify-content:center;gap:.5rem}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0ea5e94d}.btn-secondary{background:var(--surface-hover);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:var(--border);transform:translateY(-2px)}.btn-outline{background:transparent;color:var(--primary);border:1px solid var(--primary)}.btn-outline:hover{background:var(--primary);color:#fff;transform:translateY(-2px)}.status{text-align:center;padding:1rem;border-radius:var(--radius);margin-bottom:1rem;font-weight:500}.status-success{background:#10b9811a;color:var(--success);border:1px solid rgba(16,185,129,.2)}.status-error{background:#ef44441a;color:var(--error);border:1px solid rgba(239,68,68,.2)}.footer{background:var(--surface);border-top:1px solid var(--border);padding:2rem 0;margin-top:auto}.footer-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:2rem}.footer-section h3{font-size:1.125rem;font-weight:600;margin-bottom:1rem}.footer-section p,.footer-section a{color:var(--text-secondary);text-decoration:none;transition:var(--transition)}.footer-section a:hover{color:var(--text)}.footer-bottom{margin-top:2rem;padding-top:1rem;border-top:1px solid var(--border);text-align:center;color:var(--text-secondary);font-size:.875rem}@media (max-width: 768px){.hero-title{font-size:2rem}.hero-subtitle{font-size:1rem}.header-content{flex-direction:column;gap:1rem;padding:1rem 0}.nav{flex-wrap:wrap;justify-content:center}.converter{padding:1.5rem}.actions{flex-direction:column}.btn{width:100%}}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .5s ease-out}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.pulse{animation:pulse 2s infinite}.loading{display:inline-block;width:20px;height:20px;border:3px solid rgba(14,165,233,.3);border-radius:50%;border-top-color:var(--primary);animation:spin 1s ease-in-out infinite}@keyframes spin{to{transform:rotate(360deg)}}