*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#3B82F6;--primary-dim:rgba(59,130,246,.12);
  --secondary:#60A5FA;--accent:#BFDBFE;
  --bg:#0C1629;--surface:#111D33;--surface2:#182A45;
  --border:rgba(59,130,246,.1);--text:#F0F4FA;--text-dim:#8DA3C4;
  --radius:12px;--font:'Inter',system-ui,sans-serif;--mono:'Fira Code',monospace;
  --transition:250ms ease;
}
html{font-size:16px;scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.6;min-height:100vh}
.header{position:sticky;top:0;z-index:100;backdrop-filter:blur(16px);background:rgba(12,22,41,.8);border-bottom:1px solid var(--border)}
.header-inner{max-width:800px;margin:0 auto;padding:.75rem 1.5rem;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.75rem}
.logo{display:flex;align-items:center;gap:.5rem}
.logo-icon{font-size:1.25rem}
.logo h1{font-size:1.1rem;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.header-right{display:flex;gap:.5rem}
.btn{display:inline-flex;align-items:center;gap:.3rem;padding:.45rem .85rem;border:none;border-radius:8px;font-size:.8rem;font-weight:600;cursor:pointer;transition:all var(--transition);font-family:var(--font)}
.btn-sm{background:var(--surface2);color:var(--text-dim);border:1px solid var(--border)}
.btn-sm:hover{border-color:var(--primary);color:var(--primary)}
.main{max-width:800px;margin:0 auto;padding:1.5rem}
.glass-card{background:rgba(17,29,51,.6);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;margin-bottom:1.25rem}
.section-title{font-size:.9rem;font-weight:700;margin-bottom:.75rem;display:flex;align-items:center;gap:.5rem}
.section-title::before{content:'';width:4px;height:18px;background:linear-gradient(to bottom,var(--primary),var(--secondary));border-radius:2px}
.formats{display:flex;gap:.4rem;flex-wrap:wrap;margin-bottom:1rem}
.fmt-btn{padding:.4rem .8rem;border:1px solid var(--border);background:var(--surface);color:var(--text-dim);border-radius:20px;font-size:.75rem;font-weight:600;cursor:pointer;transition:all var(--transition);font-family:var(--font)}
.fmt-btn.active,.fmt-btn:hover{background:var(--primary-dim);color:var(--primary);border-color:var(--primary)}
.direction{display:flex;gap:0;margin-bottom:1rem}
.dir-btn{flex:1;padding:.5rem;border:1px solid var(--border);background:var(--surface);color:var(--text-dim);font-size:.8rem;font-weight:600;cursor:pointer;transition:all var(--transition);font-family:var(--font)}
.dir-btn:first-child{border-radius:8px 0 0 8px}.dir-btn:last-child{border-radius:0 8px 8px 0}
.dir-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}
textarea{width:100%;background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:.75rem;color:var(--text);font-family:var(--mono);font-size:.82rem;outline:none;resize:vertical;transition:border-color var(--transition)}
textarea:focus{border-color:var(--primary)}
.output-box{background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:.75rem;overflow-x:auto;min-height:100px;font-size:.82rem;line-height:1.6;color:var(--secondary);word-wrap:break-word;white-space:pre-wrap}
.output-box code{font-family:var(--mono)}
.toast{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%) translateY(100px);background:var(--surface2);color:var(--text);padding:.6rem 1.25rem;border-radius:var(--radius);font-size:.8rem;font-weight:500;border:1px solid var(--primary);box-shadow:0 8px 32px rgba(0,0,0,.4);transition:transform 300ms ease;z-index:9999;pointer-events:none}
.toast.show{transform:translateX(-50%) translateY(0)}
@media(max-width:480px){.main{padding:1rem}}