*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #4f46e5;--primary-hover: #4338ca;--bg: #f8fafc;--surface: #ffffff;--text: #1e293b;--text-secondary: #64748b;--border: #e2e8f0;--success: #10b981;--shadow: 0 1px 3px 0 rgb(0 0 0 / .1), 0 1px 2px -1px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1)}body{font-family:Sarabun,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}.app-container{display:flex;min-height:100vh}.sidebar{width:260px;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;transition:transform .3s ease,width .3s ease;position:fixed;height:100vh;z-index:100}.sidebar.collapsed{transform:translate(-100%);width:0}.sidebar-header{padding:20px;border-bottom:1px solid var(--border)}.sidebar-header h1{font-family:Kanit,sans-serif;font-size:1.25rem;font-weight:500;color:var(--primary)}h1,h2,h3,.card-title{font-family:Kanit,sans-serif;font-weight:500}.sidebar-nav{flex:1;padding:16px}.nav-item{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:8px;cursor:pointer;transition:all .2s ease;margin-bottom:8px;font-weight:500;color:var(--text-secondary)}.nav-item:hover{background:var(--bg);color:var(--text)}.nav-item.active{background:var(--primary);color:#fff}.nav-icon{width:20px;height:20px;flex-shrink:0}.main-content{flex:1;margin-left:260px;transition:margin-left .3s ease;width:calc(100% - 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