:root{--primary-color: #1a365d;--primary-hover: #2b6cb0;--secondary-color: #3182ce;--bg-color: #f7fafc;--card-bg: #ffffff;--text-main: #2d3748;--text-muted: #718096;--border-color: #e2e8f0;--shadow: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06)}body{margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg-color);color:var(--text-main);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app-container{display:flex;flex-direction:column;min-height:100vh}.app-header{background-color:var(--primary-color);color:#fff;padding:24px 40px;box-shadow:0 2px 4px #0000001a}.header-content h1{margin:0 0 4px;font-size:24px;font-weight:700;letter-spacing:.5px}.header-subtitle{margin:0;font-size:14px;color:#a0aec0}.app-main{display:flex;flex:1;padding:30px 40px;gap:30px;max-width:1400px;margin:0 auto;width:calc(100% - 80px)}.filters-sidebar{width:280px;flex-shrink:0;display:flex;flex-direction:column;gap:25px}.sidebar-section{background-color:var(--card-bg);border-radius:8px;padding:20px;box-shadow:var(--shadow);border:1px solid var(--border-color)}.sidebar-section h3{margin:0 0 15px;font-size:14px;text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted);font-weight:600}.channels-list{display:flex;flex-direction:column;gap:8px}.channel-btn{background:none;border:1px solid transparent;text-align:left;padding:10px 14px;border-radius:6px;font-size:14px;cursor:pointer;color:var(--text-main);transition:all .2s ease;font-weight:500}.channel-btn:hover{background-color:#ebf8ff;color:var(--secondary-color)}.channel-btn.active{background-color:#ebf8ff;border-color:#bee3f8;color:var(--secondary-color);font-weight:600}.toggle-container{display:flex;flex-direction:column;gap:10px}.toggle-label{display:flex;align-items:center;gap:10px;font-size:14px;font-weight:500;cursor:pointer}.toggle-label input{width:16px;height:16px;cursor:pointer}.toggle-desc{margin:0;font-size:12px;color:var(--text-muted);line-height:1.4}.feed-section{flex:1;display:flex;flex-direction:column;gap:20px}.feed-header{display:flex;justify-content:space-between;align-items:center;border-bottom:2px solid var(--border-color);padding-bottom:12px}.feed-header h2{margin:0;font-size:20px;color:var(--primary-color)}.posts-count{font-size:14px;color:var(--text-muted);margin-left:8px;font-weight:400}.refresh-btn{background-color:var(--secondary-color);color:#fff;border:none;padding:8px 16px;border-radius:6px;font-size:14px;cursor:pointer;font-weight:600;transition:background-color .2s}.refresh-btn:hover{background-color:var(--primary-hover)}.refresh-btn:disabled{background-color:var(--text-muted);cursor:not-allowed}.loading-state,.error-state,.empty-state{background-color:var(--card-bg);border-radius:8px;padding:40px;text-align:center;box-shadow:var(--shadow);border:1px solid var(--border-color);font-size:15px;color:var(--text-muted)}.error-state{color:#e53e3e;border-color:#fed7d7;background-color:#fff5f5}.posts-list{display:flex;flex-direction:column}.post-card{background-color:var(--card-bg);border-radius:8px;box-shadow:var(--shadow);border:1px solid var(--border-color);margin-bottom:40px;transition:transform .15s ease;overflow:hidden}.post-card:last-child{margin-bottom:0}.post-card:hover{transform:translateY(-2px)}.post-header{background-color:#f7fafc;padding:12px 20px;border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center;font-size:12px}.post-time{font-family:Courier New,Courier,monospace;font-weight:700;color:#c53030;font-size:13px}.post-channel{font-weight:600;color:var(--secondary-color);font-size:13px}.post-body{padding:20px;font-size:14px;line-height:1.6;white-space:pre-wrap;word-break:break-word;color:#1a202c}.app-footer{background-color:#edf2f7;border-top:1px solid var(--border-color);padding:15px;text-align:center;font-size:12px;color:var(--text-muted);margin-top:auto}@media (max-width: 900px){.app-main{flex-direction:column;padding:15px;width:calc(100% - 30px)}.filters-sidebar{width:100%}}.login-wrapper{display:flex;justify-content:center;align-items:center;min-height:100vh;background-color:var(--bg-color)}.login-card{background-color:var(--card-bg);border-radius:8px;box-shadow:var(--shadow);border:1px solid var(--border-color);padding:40px;width:100%;max-width:400px;text-align:center}.login-card h2{margin:0 0 10px;font-size:20px;color:var(--primary-color)}.login-desc{font-size:14px;color:var(--text-muted);line-height:1.5;margin:0 0 25px}.login-input{width:calc(100% - 24px);padding:12px;border:1px solid var(--border-color);border-radius:6px;font-size:15px;margin-bottom:15px;text-align:center;outline:none;transition:border-color .2s}.login-input:focus{border-color:var(--secondary-color)}.code-input{font-size:22px;letter-spacing:4px;font-weight:700}.login-btn{width:100%;background-color:var(--secondary-color);color:#fff;border:none;padding:12px;border-radius:6px;font-size:15px;font-weight:600;cursor:pointer;transition:background-color .2s}.login-btn:hover{background-color:var(--primary-hover)}.login-btn:disabled{background-color:var(--text-muted);cursor:not-allowed}.login-error{color:#e53e3e;font-size:13px;margin-bottom:15px;text-align:center}.button-group{display:flex;gap:10px;width:100%}.back-btn{background-color:#e2e8f0;color:var(--text-main);border:none;padding:12px;border-radius:6px;font-size:15px;font-weight:600;cursor:pointer;flex:1;transition:background-color .2s}.back-btn:hover{background-color:#cbd5e0}.logout-header-btn{background:none;border:1px solid rgba(255,255,255,.3);color:#fff;padding:8px 16px;border-radius:6px;cursor:pointer;font-size:13px;font-weight:600;transition:all .2s}.logout-header-btn:hover{background-color:#ffffff1a;border-color:#fff}.logout-header-btn:focus{outline:none}.app-header{display:flex;justify-content:space-between;align-items:center}.header-auth-info{display:flex;align-items:center;gap:15px}.user-badge{background-color:#ffffff26;padding:6px 12px;border-radius:20px;font-size:13px;font-weight:600;border:1px solid rgba(255,255,255,.25);color:#fff}