.smt-container{max-width:1100px;margin:30px auto;padding:15px;font-family:Arial,sans-serif}
.smt-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px}
.smt-card{background:#fff;border:1px solid #e6e6e6;border-radius:10px;padding:18px;box-shadow:0 6px 18px rgba(15,15,15,0.04)}
.smt-card h3{margin-top:0;color:#1f4a8a}
.smt-input{width:100%;padding:10px;margin:8px 0;border:1px solid #ccc;border-radius:8px}
.smt-button{display:inline-block;padding:10px 14px;background:#1f4a8a;color:#fff;border:none;border-radius:8px;cursor:pointer}
.smt-result{margin-top:12px;word-break:break-word}
.smt-preview{max-width:100%;height:auto;border-radius:6px;border:1px solid #ddd;padding:6px}
.smt-note{font-size:13px;color:#666;margin-top:8px}