:root{--primary:#4f46e5;--primary-hover:#4338ca;--secondary:#f3f4f6;--text:#111827;--text-light:#6b7280;--border:#e5e7eb;--bg-light:#f9fafb;--error:#ef4444;--success:#10b981;--card-shadow:0 4px 6px rgba(0,0,0,0.05);--page-shadow:0 2px 4px rgba(0,0,0,0.1)}*{box-sizing:border-box;margin:0;padding:0;font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif}.containert{max-width:85%;margin:100px auto;background:white;border-radius:16px;box-shadow:var(--page-shadow);overflow:hidden}.header-t{padding:24px;border-bottom:1px solid var(--border);text-align:center;background:white;color:var(--primary)}.header-t h1{font-size:2rem;line-height:1.6;margin-bottom:12px;font-weight:700;font-family:"Noto Sans",sans-serif;text-align:center}.header-t p{opacity:.9;font-size:1rem;font-family:"Noto Sans",sans-serif;text-align:center;max-width:80%;margin-left:auto;margin-right:auto}.main-content{padding:32px;display:flex;flex-direction:column;gap:24px}.editor-container{display:flex;flex-direction:column;gap:16px}.editor-header{display:flex;justify-content:space-between;align-items:center}.editor-tabs{display:flex;gap:8px}.editor-tab{padding:8px 16px;border-radius:6px;cursor:pointer;font-weight:500;background-color:var(--secondary);color:var(--text-light);border:1px solid var(--border);transition:all .2s ease}.editor-tab:hover{background-color:#e5e7eb;color:var(--text)}.editor-tab.active{background-color:var(--primary);color:white;border-color:var(--primary)}.editor-area{display:flex;gap:20px}@media(max-width:768px){.editor-area{flex-direction:column}}.editor-column{flex:1;display:flex;flex-direction:column;gap:8px}.column-header{font-weight:600;color:var(--text);font-size:.95rem;margin-bottom:4px}#markdown-input{width:100%;height:400px;padding:16px;border-radius:8px;border:1px solid var(--border);font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.5;resize:vertical;background-color:white}#markdown-input:focus{outline:0;border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,0.1)}#html-preview{width:100%;height:400px;padding:16px;border-radius:8px;border:1px solid var(--border);background-color:white;overflow-y:auto;line-height:1.6}#html-preview h1,#html-preview h2,#html-preview h3{margin-top:1em;margin-bottom:.5em}#html-preview p{margin-bottom:1em}#html-preview pre{background-color:#f5f5f5;padding:12px;border-radius:4px;overflow-x:auto;margin-bottom:1em}#html-preview code{font-family:'Courier New',Courier,monospace;background-color:#f5f5f5;padding:2px 4px;border-radius:3px}.upload-section{text-align:center;padding:48px;border:2px dashed var(--border);border-radius:12px;background-color:var(--bg-light);transition:all .3s ease;margin-bottom:24px;position:relative;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center}.upload-section:hover{border-color:var(--primary);background-color:rgba(79,70,229,0.05)}.upload-section.active{border-color:var(--primary);background-color:rgba(79,70,229,0.05)}.upload-icon{font-size:56px;color:var(--primary);margin-bottom:20px;display:block}.upload-text{font-size:1.25rem;color:var(--text);margin-bottom:12px;font-weight:500;text-align:center}.upload-hint{font-size:.95rem;color:var(--text-light);margin-bottom:24px;text-align:center}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;border-radius:8px;font-weight:600;cursor:pointer;transition:all .2s ease;border:0;outline:0;font-size:1rem;gap:8px}.btn-primary{background-color:var(--primary);color:white}.btn-primary:hover{background-color:var(--primary-hover);transform:translateY(-1px);box-shadow:0 4px 12px rgba(79,70,229,0.3)}.btn-secondary{background-color:white;color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background-color:var(--secondary);border-color:var(--primary);color:var(--primary)}#file{display:none}.options-section{margin-top:16px;padding:28px;background:linear-gradient(135deg,#f8f9fa 0,#fff 100%);border-radius:16px;border:1px solid var(--border);box-shadow:var(--card-shadow)}.options-title{font-size:1.3rem;font-weight:700;margin-bottom:24px;color:var(--primary);display:flex;align-items:center;gap:10px;padding-bottom:12px;border-bottom:2px solid var(--border)}.options-title i{font-size:1.3rem;color:var(--primary)}.options-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:24px;margin-bottom:28px}.option-group{display:flex;flex-direction:column;gap:8px}.option-label{display:flex;align-items:center;gap:8px;font-weight:600;color:var(--text);font-size:.95rem;margin-bottom:4px}.option-label i{color:var(--primary);font-size:1rem;width:20px}.option-description{font-size:.8rem;color:var(--text-light);margin-top:4px}.option-group select,.option-group input{padding:12px 16px;border-radius:10px;border:1.5px solid var(--border);background-color:white;font-size:.95rem;font-weight:500;color:var(--text);cursor:pointer;transition:all .2s ease;width:100%;max-width:250px}.option-group select:hover,.option-group input:hover{border-color:var(--primary)}.option-group select:focus,.option-group input:focus{outline:0;border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,0.1)}.option-group input{cursor:text}#page-margin{max-width:120px}.action-buttons{display:flex;justify-content:center;gap:16px;margin-top:28px;padding-top:24px;border-top:1px solid var(--border);flex-wrap:wrap}.action-buttons .btn{min-width:160px;padding:14px 28px;font-weight:600;font-size:1rem}.action-buttons .btn i{font-size:1.1rem}#convert-btn{background:linear-gradient(135deg,var(--primary) 0,var(--primary-hover) 100%);box-shadow:0 4px 15px rgba(79,70,229,0.3)}#convert-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(79,70,229,0.4)}#clear-btn{background-color:white;border:1.5px solid var(--error);color:var(--error)}#clear-btn:hover{background-color:var(--error);color:white;border-color:var(--error)}#sample-btn{background-color:white;border:1.5px solid var(--success);color:var(--success)}#sample-btn:hover{background-color:var(--success);color:white;border-color:var(--success)}.loading-overlay{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background-color:rgba(0,0,0,0.7);z-index:9999;justify-content:center;align-items:center;flex-direction:column;gap:20px}.loading-spinner{border:4px solid #f3f3f3;border-top:4px solid var(--primary);border-radius:50%;width:50px;height:50px;animation:spin 1s linear infinite}.loading-text{color:white;font-size:1rem;font-weight:500}@keyframes spin{0{transform:rotate(0)}100%{transform:rotate(360deg)}}.toast{position:fixed;bottom:30px;right:30px;padding:16px 24px;border-radius:12px;display:flex;align-items:center;gap:12px;transform:translateX(400px);transition:all .3s ease;z-index:10000;box-shadow:0 4px 20px rgba(0,0,0,0.15);max-width:400px;animation:slideIn .3s ease forwards}@keyframes slideIn{from{transform:translateX(400px);opacity:0}to{transform:translateX(0);opacity:1}}.toast.success{background:linear-gradient(135deg,var(--success) 0,#0d9488 100%);color:white}.toast.error{background:linear-gradient(135deg,var(--error) 0,#dc2626 100%);color:white}.toast.info{background:linear-gradient(135deg,var(--primary) 0,var(--primary-hover) 100%);color:white}.toast-icon{font-size:1.3rem;font-weight:bold}.toast-message{font-size:.95rem;font-weight:500}.how-to-section-wrapper{max-width:1200px;margin:4rem auto;padding:0 20px}.how-to-section-wrapper h2{font-family:'Noto Sans',sans-serif;text-align:center;font-size:2.2rem;color:#333;line-height:1.6;margin-bottom:40px}.steps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:30px}.step-card{background-color:#fff;padding:30px;border-radius:12px;border:1px solid #e9ecef;text-align:left;box-shadow:0 5px 15px rgba(0,0,0,0.05);transition:transform .3s ease,box-shadow .3s ease}.step-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px rgba(0,0,0,0.1)}.step-card .step-number{font-size:1.5rem;font-weight:700;color:#fff;background-color:#0d47a1;width:45px;height:45px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:20px}.step-card h3{font-family:'Noto Sans',sans-serif;font-size:1.3rem;margin-bottom:10px;color:#222}.step-card p{color:#666;line-height:1.6;font-size:1rem;margin:0}.content-wrapper{max-width:1200px;margin:40px auto;padding:20px;font-family:'Noto Sans',sans-serif;line-height:1.7;color:#333}.content-wrapper h2{font-size:2.2em;color:#4f46e5;margin-top:40px;margin-bottom:15px;border-bottom:2px solid #e5e7eb;padding-bottom:10px}.content-wrapper h3{font-size:1.5em;color:#222;margin-top:30px;margin-bottom:10px}.content-wrapper p{margin-bottom:20px;font-size:1em}.content-wrapper ul{list-style:none;padding:0;margin-bottom:20px}.content-wrapper ul li{position:relative;padding-left:30px;margin-bottom:15px;font-size:1em}.content-wrapper ul li i{position:absolute;left:0;top:5px;color:#10b981;font-size:1.1em}.content-wrapper a{color:#4f46e5;font-weight:bold;text-decoration:none}.content-wrapper a:hover{color:#4338ca;text-decoration:underline}@media(max-width:768px){.containert{max-width:95%;margin:60px auto}.main-content{padding:20px}.header-t p{max-width:95%}.options-section{padding:20px}.options-grid{grid-template-columns:1fr;gap:16px}.option-group select,.option-group input{max-width:100%}.action-buttons{flex-direction:column}.action-buttons .btn{width:100%;min-width:auto}.content-wrapper{padding:15px}.content-wrapper h2{font-size:1.8em}.content-wrapper h3{font-size:1.3em}.toast{left:20px;right:20px;bottom:20px;max-width:calc(100% - 40px)}}@media(max-width:480px){.header-t h1{font-size:1.5rem}.upload-section{padding:32px 20px}.upload-icon{font-size:40px}.upload-text{font-size:1rem}.options-title{font-size:1.1rem}.step-card{padding:20px}.step-card h3{font-size:1.1rem}}