*{box-sizing:border-box;margin:0;padding:0}:root{--primary: #2563eb;--primary-dark: #1d4ed8;--bg: #f8fafc;--card-bg: #ffffff;--border: #e2e8f0;--text: #1e293b;--text-muted: #64748b;--code-bg: #1e293b;--night-bg: #2f2f31}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}header{background:var(--card-bg);border-bottom:1px solid var(--border);padding:1.5rem 2rem;text-align:center}header h1{font-size:2rem;color:var(--primary)}header .tagline{color:var(--text-muted);margin:.5rem 0 1rem}header nav{display:flex;gap:1.5rem;justify-content:center}header nav a{color:var(--text);text-decoration:none;font-weight:500}header nav a:hover{color:var(--primary)}main{max-width:1200px;margin:0 auto;padding:2rem}.section{margin-bottom:3rem}.section h2{font-size:1.5rem;margin-bottom:1rem;color:var(--text)}.demo-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem}@media (max-width: 900px){.demo-grid{grid-template-columns:1fr}}.editor-panel{display:flex;flex-direction:column;gap:1rem}.editor-group{display:flex;flex-direction:column;gap:.5rem}.editor-group label{font-weight:500;font-size:.875rem;color:var(--text-muted)}.editor-group textarea,.editor-group input{padding:.75rem;border:1px solid var(--border);border-radius:6px;font-family:SF Mono,Monaco,monospace;font-size:.875rem;resize:vertical}.editor-group textarea:focus,.editor-group input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #2563eb1a}.options-row{display:flex;gap:1rem;align-items:flex-end}.checkbox-group{display:flex;gap:1rem}.checkbox-group label{display:flex;align-items:center;gap:.5rem;font-size:.875rem;cursor:pointer}.preview-panel{background:var(--card-bg);border:1px solid var(--border);border-radius:8px;overflow:hidden}.preview-header{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1rem;background:var(--bg);border-bottom:1px solid var(--border)}.preview-header h3{font-size:.875rem;font-weight:600}.side-toggle{display:flex;gap:.5rem}.side-toggle button{padding:.375rem .75rem;border:1px solid var(--border);background:var(--card-bg);border-radius:4px;cursor:pointer;font-size:.75rem;font-weight:500}.side-toggle button.active{background:var(--primary);color:#fff;border-color:var(--primary)}.preview-container{min-height:200px;padding:1rem}.preview-container.night-mode{background:var(--night-bg)}#card-preview{font-family:arial;font-size:20px;text-align:center}.example-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem}.example-card{background:var(--card-bg);border:1px solid var(--border);border-radius:8px;padding:1.25rem}.example-card h3{font-size:1rem;margin-bottom:.5rem}.example-card p{color:var(--text-muted);font-size:.875rem;margin-bottom:1rem}.try-btn{padding:.5rem 1rem;background:var(--primary);color:#fff;border:none;border-radius:4px;cursor:pointer;font-weight:500}.try-btn:hover{background:var(--primary-dark)}.api-section{background:var(--card-bg);border:1px solid var(--border);border-radius:8px;padding:1.5rem;margin-bottom:1rem}.api-section h3{font-size:1rem;margin-bottom:1rem}.api-section pre{background:var(--code-bg);color:#e2e8f0;padding:1rem;border-radius:6px;overflow-x:auto;font-size:.875rem;line-height:1.5}.api-section code{font-family:SF Mono,Monaco,monospace}.api-section table{width:100%;border-collapse:collapse}.api-section th,.api-section td{padding:.75rem;text-align:left;border-bottom:1px solid var(--border)}.api-section th{font-weight:600;background:var(--bg)}.api-section td code{background:var(--bg);padding:.125rem .375rem;border-radius:3px;font-size:.875rem}footer{text-align:center;padding:2rem;color:var(--text-muted);font-size:.875rem}footer a{color:var(--primary)}.cloze{font-weight:700;color:#00f}.hint{background-color:#ffc;padding:2px 4px;border-radius:2px;cursor:pointer}.nightMode .cloze{color:#5cb3ff}.nightMode .hint{background-color:#444;color:#ccc}