.inbox-container{display:flex;height:calc(100vh - 70px);background:var(--color-gray-200)}.inbox-sidebar{width:200px;background:var(--color-white);border-right:1px solid var(--color-gray-400);display:flex;flex-direction:column;padding:var(--spacing-md) var(--spacing-sm)}.compose-button{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:14px 24px;margin:0 var(--spacing-sm) var(--spacing-md);background:var(--color-navy);color:var(--color-white);border:none;border-radius:4px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s}.compose-button:hover{background:var(--color-navy-hover)}.folder-list{flex:1;overflow-y:auto}.folder-item{display:flex;align-items:center;gap:12px;padding:10px var(--spacing-md);margin:2px 0;border-radius:4px;cursor:pointer;color:var(--color-gray-600);font-size:14px;transition:all .15s}.folder-item:hover{background:var(--color-gray-200)}.folder-item.active{background:var(--color-gray-200);color:var(--color-navy);font-weight:600}.folder-icon{width:20px;font-size:16px}.folder-name{flex:1}.folder-count{background:var(--color-navy);color:var(--color-white);font-size:11px;padding:2px 8px;border-radius:10px;font-weight:600}.inbox-sidebar-footer{padding-top:var(--spacing-md);border-top:1px solid var(--color-gray-400)}.settings-button{display:flex;align-items:center;gap:var(--spacing-sm);width:100%;padding:10px var(--spacing-md);background:none;border:none;color:var(--color-gray-600);font-size:var(--font-small);cursor:pointer;border-radius:4px;transition:background .15s}.settings-button:hover{background:var(--color-gray-200)}.inbox-main{flex:1;display:flex;flex-direction:column;overflow:hidden}.inbox-toolbar{display:flex;align-items:center;padding:var(--spacing-sm) var(--spacing-md);background:var(--color-white);border-bottom:1px solid var(--color-gray-400);gap:var(--spacing-md)}.toolbar-left{display:flex;align-items:center;gap:var(--spacing-sm)}.toolbar-center{flex:1;max-width:600px}.toolbar-right{display:flex;align-items:center;gap:var(--spacing-sm);color:var(--color-gray-600);font-size:var(--font-small)}.checkbox-container{display:inline-block;position:relative;width:18px;height:18px;cursor:pointer}.checkbox-container input{opacity:0;position:absolute;cursor:pointer}.checkmark{position:absolute;top:0;left:0;width:18px;height:18px;border:2px solid var(--color-gray-400);border-radius:3px;transition:all .15s}.checkbox-container:hover .checkmark{border-color:var(--color-gray-600)}.checkbox-container input:checked~.checkmark{background:var(--color-navy);border-color:var(--color-navy)}.checkbox-container input:checked~.checkmark:after{content:"";position:absolute;left:5px;top:1px;width:5px;height:10px;border:solid var(--color-white);border-width:0 2px 2px 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input:focus{background:var(--color-white);border-color:var(--color-navy);outline:none}.clear-search{position:absolute;right:12px;background:none;border:none;color:var(--color-gray-600);cursor:pointer;padding:var(--spacing-xs)}.page-button{padding:var(--spacing-sm);background:none;border:none;color:var(--color-gray-600);cursor:pointer;border-radius:4px;transition:background .15s}.page-button:hover:not(:disabled){background:var(--color-gray-200)}.page-button:disabled{opacity:.3;cursor:not-allowed}.email-count{font-size:12px;color:var(--color-gray-600)}.inbox-content{flex:1;display:flex;overflow:hidden}.email-list{flex:1;overflow-y:auto;background:var(--color-white)}.email-list.with-preview{max-width:400px;border-right:1px solid var(--color-gray-400)}.loading-state,.error-state,.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:300px;color:var(--color-gray-600);gap:var(--spacing-md)}.loading-state svg,.error-state svg,.empty-state svg{font-size:48px;opacity:.5}.error-state button{padding:var(--spacing-sm) var(--spacing-md);background:var(--color-navy);color:var(--color-white);border:none;border-radius:4px;cursor:pointer}.email-item{display:flex;align-items:center;padding:var(--spacing-sm) var(--spacing-md);border-bottom:1px solid var(--color-gray-200);cursor:pointer;transition:background .15s;gap:var(--spacing-sm)}.email-item:hover{background:var(--color-gray-100)}.email-item.selected,.email-item.checked{background:var(--color-gray-200)}.email-item.unread{background:var(--color-white)}.email-item.unread .email-sender,.email-item.unread 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h4{margin:0 0 var(--spacing-sm);font-size:var(--font-small);color:var(--color-gray-600);display:flex;align-items:center;gap:var(--spacing-sm)}.attachment-list{display:flex;flex-wrap:wrap;gap:var(--spacing-sm)}.attachment-item{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) 12px;background:var(--color-white);border:1px solid var(--color-gray-400);border-radius:4px;text-decoration:none;color:var(--color-black);font-size:var(--font-small);transition:all .15s}.attachment-item:hover{background:var(--color-gray-200);border-color:var(--color-gray-600)}.attachment-size{color:var(--color-gray-600);font-size:11px}.preview-body{flex:1;padding:var(--spacing-md);overflow:auto}.preview-body pre{white-space:pre-wrap;word-wrap:break-word;font-family:inherit;margin:0;font-size:14px;line-height:1.6;color:var(--color-black)}.preview-body iframe{width:100%;height:100%;border:none;min-height:300px}.preview-footer{padding:12px var(--spacing-md);border-top:1px solid var(--color-gray-400);display:flex;justify-content:flex-start}.reply-button{display:flex;align-items:center;gap:var(--spacing-sm);padding:10px 20px;background:var(--color-white);border:1px solid var(--color-gray-400);border-radius:4px;color:var(--color-black);font-size:14px;cursor:pointer;transition:all .15s}.reply-button:hover{background:var(--color-gray-100);border-color:var(--color-navy)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.modal{background:var(--color-white);border-radius:8px;max-width:90vw;max-height:90vh;display:flex;flex-direction:column}.settings-modal{width:500px}.compose-modal{width:600px}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-md) 20px;border-bottom:1px solid var(--color-gray-400)}.modal-header h3{margin:0;font-size:18px;color:var(--color-black);display:flex;align-items:center;gap:var(--spacing-sm);border:none;padding:0}.close-button{padding:var(--spacing-sm);background:none;border:none;color:var(--color-gray-600);cursor:pointer;border-radius:4px;font-size:16px}.close-button:hover{background:var(--color-gray-200)}.modal-body{padding:20px;overflow-y:auto;flex:1}.modal-footer{display:flex;justify-content:flex-end;gap:12px;padding:var(--spacing-md) 20px;border-top:1px solid var(--color-gray-400)}.inbox-container .form-group{margin-bottom:var(--spacing-md)}.inbox-container .form-group label{display:block;margin-bottom:6px;font-size:var(--font-small);font-weight:500;color:var(--color-gray-600)}.inbox-container .form-group input,.inbox-container .form-group select,.inbox-container .form-group textarea{width:100%;padding:10px 12px;border:1px solid var(--color-gray-400);border-radius:4px;font-size:14px;transition:border-color .15s}.inbox-container .form-group 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var(--color-navy);border-radius:4px;font-size:14px}.error-message{display:flex;align-items:center;gap:var(--spacing-sm);padding:12px;background:var(--color-gray-100);color:var(--color-black);border:1px solid var(--color-black);border-radius:4px;font-size:14px;margin-bottom:var(--spacing-md)}@media(max-width:768px){.inbox-sidebar{width:60px;padding:var(--spacing-sm)}.compose-button span,.folder-name,.folder-count,.settings-button span{display:none}.compose-button{padding:12px;margin:0 0 12px}.folder-item{padding:12px;justify-content:center;border-radius:4px;margin:var(--spacing-xs)}.email-sender{width:100px}.email-list.with-preview{display:none}.modal{max-width:95vw;margin:var(--spacing-md)}}:root{--color-navy: #00376d;--color-navy-hover: #002a52;--color-white: #ffffff;--color-black: #333333;--color-gray-100: #f9f9f9;--color-gray-200: #f1f1f1;--color-gray-300: #e0e0e0;--color-gray-400: #dddddd;--color-gray-500: #999999;--color-gray-600: #666666;--font-large: 24px;--font-medium: 16px;--font-small: 13px;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px}body{margin:0;background-color:var(--color-gray-200);font-family:-apple-system,BlinkMacSystemFont,Helvetica Neue,Noto Sans Japanese,Hiragino Kaku Gothic ProN,Arial,Meiryo,sans-serif;color:var(--color-black);font-size:var(--font-medium);line-height:1.5;overflow-x:hidden}a{color:var(--color-navy);text-decoration:none}a:hover{color:var(--color-navy-hover)}.app-layout{display:flex;min-height:100vh}.app-main{flex-grow:1;display:flex;flex-direction:column}.main-content{flex-grow:1;padding:var(--spacing-lg) var(--spacing-xl);background-color:var(--color-gray-200)}.main-content h2{position:relative;padding-left:var(--spacing-xl);font-size:var(--font-large);font-weight:700;margin-bottom:var(--spacing-lg)}.main-content 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