:root{--bg-color: #0f172a;--text-color: #e2e8f0;--primary-color: #3b82f6;--primary-hover: #2563eb;--secondary-bg: #1e293b;--border-color: #334155;--accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);--glass-bg: rgba(30, 41, 59, .7);--glass-border: rgba(255, 255, 255, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--font-family: "Inter", system-ui, -apple-system, sans-serif}body{margin:0;font-family:var(--font-family);background-color:var(--bg-color);color:var(--text-color);line-height:1.6;min-height:100vh;display:flex;flex-direction:column}.app-layout{display:flex;flex-direction:column;min-height:100vh;max-width:1200px;margin:0 auto;padding:0 20px;width:100%;box-sizing:border-box}.app-header{padding:40px 0 20px;text-align:center}.logo{font-size:3rem;font-weight:800;background:var(--accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.05em;margin-bottom:10px}.subtitle{font-size:1.2rem;color:#94a3b8}.app-content{flex:1;display:flex;justify-content:center;align-items:flex-start;padding:20px 0}.app-footer{text-align:center;padding:40px 0;color:#64748b;font-size:.9rem}.converter-container{width:100%;max-width:900px;background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:24px;padding:40px;box-shadow:var(--shadow-lg);display:flex;flex-direction:column;gap:30px}.section-label{display:block;font-size:.9rem;font-weight:600;color:#94a3b8;margin-bottom:10px;text-transform:uppercase;letter-spacing:.05em}.text-area{width:100%;height:200px;background:var(--secondary-bg);border:1px solid var(--border-color);border-radius:12px;color:var(--text-color);padding:16px;font-family:JetBrains Mono,monospace;font-size:.9rem;resize:vertical;transition:border-color .2s,box-shadow .2s;box-sizing:border-box}.text-area:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #3b82f633}.controls-section{display:flex;justify-content:center;padding:10px 0}.format-selector{display:flex;gap:10px;background:var(--secondary-bg);padding:6px;border-radius:12px;border:1px solid var(--border-color)}.format-selector .label{display:flex;align-items:center;padding:0 15px;font-weight:600;color:#94a3b8}.format-btn{background:transparent;border:none;color:var(--text-color);padding:10px 20px;border-radius:8px;cursor:pointer;font-weight:600;transition:all .2s}.format-btn:hover{background:#ffffff0d}.format-btn.active{background:var(--primary-color);color:#fff;box-shadow:0 2px 4px #0000001a}.output-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.output-header .section-label{margin-bottom:0}.copy-btn{background:var(--primary-color);color:#fff;border:none;padding:8px 16px;border-radius:8px;font-weight:600;cursor:pointer;transition:all .2s;font-size:.9rem}.copy-btn:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-1px)}.copy-btn:disabled{background:var(--border-color);cursor:not-allowed;opacity:.7}.copy-btn.success{background:#10b981}@media(max-width:768px){.converter-container{padding:20px}.format-selector{flex-direction:column;width:100%}.format-selector .label{padding:10px;justify-content:center}.format-btn{width:100%}}