*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#238636;--primary-dim:rgba(35,134,54,.12);
  --secondary:#58A6FF;--accent:#F78166;--accent-dim:rgba(247,129,102,.12);
  --bg:#0D1117;--surface:#161B22;--surface2:#21262D;
  --border:rgba(48,54,61,.5);--text:#E6EDF3;--text-dim:#8B949E;
  --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(13,17,23,.8);border-bottom:1px solid var(--border)}
.header-inner{max-width:1100px;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;align-items:center;flex-wrap:wrap}
.header-right select{background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:.4rem .6rem;color:var(--text);font-family:var(--font);font-size:.75rem;outline:none}
.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:1100px;margin:0 auto;padding:1.5rem}
.glass-card{background:rgba(22,27,34,.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}
.split-view{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
.section-block{background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:.75rem;margin-bottom:.5rem}
.sb-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.4rem}
.sb-title-input{background:none;border:none;color:var(--secondary);font-size:.85rem;font-weight:700;font-family:var(--font);outline:none;flex:1}
.sb-del{background:none;border:none;cursor:pointer;color:var(--text-dim);font-size:.75rem}
.sb-type{display:flex;gap:.3rem;margin-bottom:.4rem}
.sb-type button{padding:.2rem .5rem;border:1px solid var(--border);background:var(--surface);color:var(--text-dim);border-radius:6px;font-size:.65rem;font-weight:600;cursor:pointer;transition:all var(--transition);font-family:var(--font)}
.sb-type button.active{border-color:var(--primary);color:var(--primary);background:var(--primary-dim)}
.sb-content{width:100%;background:var(--surface);border:1px solid var(--border);border-radius:6px;padding:.4rem;color:var(--text);font-family:var(--mono);font-size:.75rem;outline:none;resize:vertical;min-height:50px}
.sb-content:focus{border-color:var(--primary)}
.md-preview{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:.75rem;font-family:var(--mono);font-size:.75rem;color:var(--text-dim);white-space:pre-wrap;word-break:break-word;min-height:300px;max-height:600px;overflow-y:auto}
.info-card{border-left:3px solid var(--primary)}
.info-text{font-size:.8rem;color:var(--text-dim)}
.info-text code{background:var(--surface2);padding:.1rem .4rem;border-radius:4px;font-family:var(--mono);font-size:.75rem;color:var(--secondary)}
.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:700px){.split-view{grid-template-columns:1fr}.main{padding:1rem}}