:root{--primary-color: #4a6fa5;--primary-dark: #3a5a8c;--secondary-color: #f8f9fa;--accent-color: #e63946;--text-color: #333;--text-light: #6c757d;--border-color: #dee2e6;--shadow: 0 4px 6px rgba(0, 0, 0, .1);--border-radius: 8px;--font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);line-height:1.6;color:var(--text-color);background-color:#f5f7fa}.app-container{display:flex;flex-direction:column;min-height:100vh}header{background-color:var(--primary-color);color:#fff;padding:2rem 0;text-align:center;box-shadow:var(--shadow)}.header-content{max-width:1200px;margin:0 auto;padding:0 1rem}h1{font-size:2.5rem;margin-bottom:.5rem}.subtitle{font-size:1.1rem;opacity:.9}main{flex:1;padding:2rem 1rem;max-width:1200px;margin:0 auto;width:100%}.message-board{background-color:#fff;border-radius:var(--border-radius);box-shadow:var(--shadow);overflow:hidden}.board-header{padding:1.5rem;background-color:var(--secondary-color);border-bottom:1px solid var(--border-color)}.board-header h2{color:var(--primary-color);margin-bottom:.5rem}.board-header p{color:var(--text-light)}.message-form{display:flex;padding:1.5rem;border-bottom:1px solid var(--border-color);gap:1rem}.message-input{flex:1;padding:.75rem 1rem;border:1px solid var(--border-color);border-radius:var(--border-radius);font-size:1rem;transition:border-color .3s}.message-input:focus{outline:none;border-color:var(--primary-color)}.post-button{background-color:var(--primary-color);color:#fff;border:none;border-radius:var(--border-radius);padding:.75rem 1.5rem;font-size:1rem;cursor:pointer;transition:background-color .3s}.post-button:hover{background-color:var(--primary-dark)}.messages-container{padding:1.5rem}.message-card{display:flex;justify-content:space-between;align-items:flex-start;padding:1.25rem;border:1px solid var(--border-color);border-radius:var(--border-radius);margin-bottom:1rem;background-color:#fff;transition:transform .2s,box-shadow .2s}.message-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.message-content{flex:1}.message-content p{margin-bottom:.5rem;font-size:1.1rem}.message-meta{color:var(--text-light);font-size:.85rem}.delete-button{background-color:transparent;border:none;color:var(--text-light);font-size:1.5rem;cursor:pointer;width:30px;height:30px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:background-color .3s,color .3s}.delete-button:hover{background-color:var(--accent-color);color:#fff}.empty-state{text-align:center;padding:3rem 1rem;color:var(--text-light)}.empty-prompt{margin-top:.5rem;font-size:.9rem}.loading{text-align:center;padding:2rem;color:var(--text-light)}footer{background-color:var(--secondary-color);color:var(--text-light);text-align:center;padding:1.5rem;border-top:1px solid var(--border-color)}@media (max-width: 768px){.message-form{flex-direction:column}.post-button{width:100%}h1{font-size:2rem}}