:root{--bg-color: #0f172a;--text-color: #f8fafc;--primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);--glass-bg: rgba(30, 41, 59, .7);--glass-border: rgba(255, 255, 255, .1);--card-shadow: 0 8px 32px 0 rgba(0, 0, 0, .37);--input-bg: rgba(15, 23, 42, .6);--font-main: "Inter", system-ui, -apple-system, sans-serif}body{margin:0;font-family:var(--font-main);background-color:var(--bg-color);color:var(--text-color);min-height:100vh;background-image:radial-gradient(circle at 10% 20%,rgba(99,102,241,.15) 0%,transparent 20%),radial-gradient(circle at 90% 80%,rgba(168,85,247,.15) 0%,transparent 20%);-webkit-font-smoothing:antialiased}*{box-sizing:border-box}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#fff3;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#ffffff4d}.app-container{max-width:1200px;margin:0 auto;padding:2rem;display:flex;flex-direction:column;gap:2rem}.header{text-align:center;margin-bottom:2rem;animation:fadeInDown .8s ease-out}.title{font-size:3.5rem;font-weight:800;margin:0;background:var(--primary-gradient);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.05em;filter:drop-shadow(0 0 20px rgba(168,85,247,.3))}.subtitle{color:#94a3b8;font-size:1.1rem;margin-top:.5rem}.main-content{display:grid;grid-template-columns:1fr 1fr;gap:2rem;height:600px;animation:fadeInUp .8s ease-out .2s backwards}.card{background:var(--glass-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:24px;padding:1.5rem;box-shadow:var(--card-shadow);display:flex;flex-direction:column;transition:transform .3s ease,box-shadow .3s ease;overflow:hidden}.card:hover{transform:translateY(-5px);box-shadow:0 12px 40px #00000073;border-color:#fff3}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.card-title{font-size:1.2rem;font-weight:600;color:#e2e8f0;display:flex;align-items:center;gap:.5rem}.editor-area{flex:1;background:var(--input-bg);border:1px solid var(--glass-border);border-radius:16px;color:#e2e8f0;padding:1rem;font-family:JetBrains Mono,monospace;font-size:.95rem;resize:none;outline:none;transition:border-color .3s ease;line-height:1.6}.editor-area:focus{border-color:#818cf8}.preview-area{flex:1;background:#fffffff2;color:#1e293b;border-radius:16px;padding:2rem;overflow-y:auto;font-family:Times New Roman,serif;line-height:1.6}.preview-area h1,.preview-area h2,.preview-area h3{color:#0f172a}.controls{display:flex;justify-content:center;gap:1rem;margin-top:1rem;animation:fadeIn 1s ease-out .5s backwards}.btn{background:var(--primary-gradient);border:none;padding:1rem 2.5rem;border-radius:50px;color:#fff;font-weight:600;font-size:1.1rem;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #6366f166;display:flex;align-items:center;gap:.5rem}.btn:hover{transform:scale(1.05);box-shadow:0 8px 25px #6366f199}.btn:active{transform:scale(.98)}.btn-secondary{background:transparent;border:2px solid rgba(255,255,255,.2);box-shadow:none}.btn-secondary:hover{background:#ffffff1a;border-color:#fff6}.file-input-wrapper{position:relative;overflow:hidden;display:inline-block}.file-input{position:absolute;left:0;top:0;opacity:0;width:100%;height:100%;cursor:pointer}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@media(max-width:768px){.main-content{grid-template-columns:1fr;height:auto}.editor-area,.preview-area{min-height:400px}}.filename-input{background:#0f172a99;border:1px solid rgba(255,255,255,.1);padding:.5rem 1rem;border-radius:8px;color:#fff;font-family:inherit;outline:none;width:200px}