:root{--bg:#0a0a0a;--bg-card:#141414;--bg-hover:#1a1a1a;--border:#262626;--text:#e5e5e5;--text-dim:#a3a3a3;--primary:#0ea5e9;--primary-hover:#38bdf8;--primary-bg:rgba(14,165,233,.1);--radius:12px;--shadow:0 2px 8px rgba(0,0,0,.3)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;display:flex;flex-direction:column}
a{color:var(--primary);text-decoration:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.header{border-bottom:1px solid var(--border);padding:16px 0;background:var(--bg)}
.header .container{display:flex;justify-content:space-between;align-items:center}
.logo{display:flex;align-items:center;gap:10px;font-size:1.2rem;font-weight:700;color:var(--text)}
.nav{display:flex;gap:16px}
.nav-link{color:var(--text-dim);font-size:.9rem;transition:color .2s}
.nav-link:hover{color:var(--primary)}
.main{flex:1;padding:40px 0}
.hero{text-align:center;margin-bottom:48px}
.hero h1{font-size:2.5rem;margin-bottom:12px;background:linear-gradient(135deg,var(--primary),var(--primary-hover));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{color:var(--text-dim);font-size:1.1rem;max-width:600px;margin:0 auto}
.category{margin-bottom:40px}
.category h2{font-size:1.4rem;margin-bottom:4px}
.category-desc{color:var(--text-dim);font-size:.9rem;margin-bottom:20px}
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.tool-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;transition:all .2s;display:block;color:var(--text)}
.tool-card:hover{border-color:var(--primary);background:var(--bg-hover);transform:translateY(-2px);box-shadow:var(--shadow)}
.tool-icon{width:44px;height:44px;background:var(--primary-bg);border-radius:10px;display:flex;align-items:center;justify-content:center;margin-bottom:12px;color:var(--primary)}
.tool-card h3{font-size:1rem;margin-bottom:6px}
.tool-card p{color:var(--text-dim);font-size:.85rem;line-height:1.4}
.tool-header{margin-bottom:24px}
.back-link{color:var(--text-dim);font-size:.9rem;display:inline-block;margin-bottom:12px;transition:color .2s}
.back-link:hover{color:var(--primary)}
.tool-header h1{font-size:1.8rem;margin-bottom:8px}
.tool-header p{color:var(--text-dim)}
.tool-container{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.tool-content{padding:24px;min-height:400px}
.btn{padding:8px 16px;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text);cursor:pointer;font-size:.85rem;transition:all .2s;display:inline-flex;align-items:center;gap:6px}
.btn:hover{border-color:var(--primary);color:var(--primary)}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary);font-weight:600}
.btn-primary:hover{background:var(--primary-hover);border-color:var(--primary-hover)}
.btn-sm{padding:5px 10px;font-size:.8rem}
.btn-lg{padding:12px 28px;font-size:1rem}
.toolbar{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px;padding:10px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius)}
.toolbar .btn{padding:6px 10px}
.toolbar .separator{width:1px;background:var(--border);margin:0 4px}
.dual-pane{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;min-height:450px}
.pane{display:flex;flex-direction:column}
.pane-header{padding:8px 14px;background:var(--bg);border-bottom:1px solid var(--border);font-size:.85rem;font-weight:600;color:var(--text-dim);display:flex;justify-content:space-between;align-items:center}
.pane textarea{flex:1;padding:14px;background:var(--bg-card);border:none;color:var(--text);font-family:'SF Mono',Monaco,Consolas,monospace;font-size:.9rem;resize:none;outline:none;line-height:1.6}
.pane .preview{flex:1;padding:14px;background:var(--bg-card);color:var(--text);font-size:.95rem;line-height:1.6;overflow:auto;border-left:1px solid var(--border)}
.preview h1{font-size:1.8rem;margin:16px 0 8px;border-bottom:1px solid var(--border);padding-bottom:8px}
.preview h2{font-size:1.5rem;margin:14px 0 6px;border-bottom:1px solid var(--border);padding-bottom:6px}
.preview h3{font-size:1.2rem;margin:12px 0 6px}
.preview h4,.preview h5,.preview h6{font-size:1rem;margin:10px 0 4px}
.preview p{margin:8px 0}
.preview code{background:var(--bg);padding:2px 6px;border-radius:4px;font-size:.85rem;font-family:'SF Mono',Monaco,Consolas,monospace}
.preview pre{background:var(--bg);padding:14px;border-radius:8px;overflow-x:auto;margin:12px 0;border:1px solid var(--border)}
.preview pre code{background:none;padding:0}
.preview blockquote{border-left:3px solid var(--primary);padding-left:14px;color:var(--text-dim);margin:12px 0}
.preview ul,.preview ol{padding-left:24px;margin:8px 0}
.preview li{margin:4px 0}
.preview table{border-collapse:collapse;width:100%;margin:12px 0}
.preview th,.preview td{border:1px solid var(--border);padding:8px 12px;text-align:left}
.preview th{background:var(--bg)}
.preview hr{border:none;border-top:1px solid var(--border);margin:16px 0}
.preview img{max-width:100%;border-radius:8px}
.preview a{color:var(--primary)}
.code-output{width:100%;min-height:250px;padding:14px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-family:'SF Mono',Monaco,Consolas,monospace;font-size:.9rem;resize:vertical;outline:none;line-height:1.5}
.code-output:focus{border-color:var(--primary)}
.action-bar{display:flex;justify-content:center;padding:16px;gap:10px;flex-wrap:wrap}
.table-editor{overflow-x:auto;margin:16px 0}
.table-editor table{border-collapse:collapse;width:100%}
.table-editor th,.table-editor td{border:1px solid var(--border);padding:0}
.table-editor input{width:100%;padding:8px 10px;background:transparent;border:none;color:var(--text);font-size:.85rem;outline:none;text-align:center}
.table-editor th input{font-weight:600}
.table-controls{display:flex;gap:8px;margin-bottom:12px;flex-wrap:wrap}
.table-controls .form-inline{display:flex;align-items:center;gap:6px}
.table-controls input[type="number"]{width:60px;padding:6px 8px;background:var(--bg);border:1px solid var(--border);border-radius:6px;color:var(--text);font-size:.85rem}
.result-box{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:14px;margin-top:16px;font-family:'SF Mono',Monaco,Consolas,monospace;font-size:.85rem;white-space:pre-wrap;word-break:break-all;position:relative;max-height:400px;overflow:auto}
.result-box .copy-btn{position:absolute;top:8px;right:8px}
.form-group{margin-bottom:14px}
.form-group label{display:block;font-size:.85rem;color:var(--text-dim);margin-bottom:6px}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:10px 14px;background:var(--bg);border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:.9rem;outline:none}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:var(--primary)}
.form-row{display:flex;gap:12px}
.form-row .form-group{flex:1}
.cheat-section{margin-bottom:20px;padding:16px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius)}
.cheat-section h3{font-size:1rem;margin-bottom:8px;color:var(--primary)}
.cheat-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:8px;align-items:start}
.cheat-code{font-family:'SF Mono',Monaco,Consolas,monospace;font-size:.85rem;background:var(--bg-card);padding:8px 10px;border-radius:6px;border:1px solid var(--border)}
.cheat-result{font-size:.9rem;padding:8px 10px}
.slide-container{background:#000;border-radius:var(--radius);overflow:hidden;position:relative;aspect-ratio:16/9;max-height:500px}
.slide{display:none;padding:40px 60px;height:100%;justify-content:center;align-items:center;flex-direction:column;text-align:center;color:#fff}
.slide.active{display:flex}
.slide h1{font-size:2.5rem;margin-bottom:16px}
.slide h2{font-size:1.8rem;margin-bottom:12px}
.slide p{font-size:1.2rem;color:#ccc;margin:6px 0}
.slide ul,.slide ol{text-align:left;font-size:1.1rem;margin:12px 0}
.slide li{margin:6px 0;color:#ccc}
.slide-controls{display:flex;justify-content:center;gap:12px;margin-top:12px}
.slide-counter{text-align:center;margin-top:8px;font-size:.85rem;color:var(--text-dim)}
.badge-preview{display:flex;flex-wrap:wrap;gap:12px;margin-top:16px}
.badge-item{padding:8px;background:var(--bg);border:1px solid var(--border);border-radius:8px;text-align:center}
.badge-item img{display:block;margin-bottom:6px}
.badge-item code{font-size:.75rem;color:var(--text-dim)}
.diff-output{font-family:'SF Mono',Monaco,Consolas,monospace;font-size:.85rem;max-height:500px;overflow:auto;margin-top:16px}
.diff-line{padding:2px 8px;white-space:pre-wrap;word-break:break-all}
.diff-add{background:rgba(34,197,94,.15);color:#4ade80}
.diff-remove{background:rgba(239,68,68,.15);color:#f87171}
.diff-info{color:var(--primary);font-weight:600;margin-top:8px;padding:4px 8px}
.toast{position:fixed;bottom:24px;right:24px;background:var(--primary);color:#fff;padding:12px 20px;border-radius:8px;font-weight:600;font-size:.9rem;opacity:0;transform:translateY(12px);transition:all .3s;z-index:100;pointer-events:none}
.toast.show{opacity:1;transform:translateY(0)}
.footer{border-top:1px solid var(--border);padding:20px 0;text-align:center;color:var(--text-dim);font-size:.85rem}
.footer-info{margin-bottom:12px;line-height:1.8}
.footer-info strong{color:var(--text)}
.footer-info a{color:var(--primary)}
.footer-social{margin-bottom:10px}
.footer-social a{color:var(--text-dim);margin:0 6px;transition:color .2s}
.footer-social a:hover{color:var(--primary)}
.footer-tech{font-size:.75rem;color:#475569;margin-bottom:10px}
.footer-links{margin-top:8px;font-size:.8rem}
.footer-links a{color:var(--text-dim);margin:0 6px}
.footer-links a:hover{color:var(--primary)}
@media(max-width:768px){
.hero h1{font-size:1.8rem}
.tools-grid{grid-template-columns:1fr}
.dual-pane{grid-template-columns:1fr;min-height:auto}
.pane textarea,.pane .preview{min-height:250px}
.nav{gap:8px}.nav-link{font-size:.8rem}
.header .container{flex-wrap:wrap;gap:10px}
.cheat-row{grid-template-columns:1fr}
.form-row{flex-direction:column}
.slide h1{font-size:1.5rem}
.slide h2{font-size:1.2rem}
}