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linear-gradient(135deg, #e9ecef 0%, #dee2e6 100%);--border: #dee2e6;--text: #333333;--heading: #007bff;--accent: #0056b3;--accent-gradient: linear-gradient(45deg, #007bff 0%, #0056b3 100%);--input-bg: #ffffff;--input-border: #ced4da;--input-text: #333333;--focus: #007bff;--hover: rgba(0, 123, 255, .08);--overlay: rgba(33, 37, 41, .6);--heading-shadow: none;--card-shadow: 0 2px 8px rgba(0, 0, 0, .1)}.app{min-height:100vh;background:var(--bg);color:var(--text)}h1,h2,h3{color:var(--heading);text-shadow:var(--heading-shadow);transition:color .3s ease}.page{max-width:1200px;margin:0 auto;padding:20px 30px}.page-title{margin-bottom:25px}.page-centered{text-align:center;padding-top:50px}.page-centered p{margin-bottom:20px}.surface{background:var(--surface);border:1px solid var(--border);border-radius:15px;box-shadow:var(--card-shadow)}.status-message{text-align:center;font-size:18px;padding:40px}.error-text{color:var(--accent)}.btn{display:inline-block;border:none;padding:12px 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600px){.details-title{font-size:1.8rem}.details-sections{grid-template-columns:1fr}}.auth-form{padding:20px}.auth-title{text-align:center;margin-bottom:25px}.auth-field{margin-bottom:20px}.auth-label{display:block;margin-bottom:8px;font-size:14px}.auth-input{width:100%}.auth-error{text-align:center;font-size:14px;margin-bottom:15px}.auth-submit{width:100%;padding:12px}.menu-nav{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:15px;padding:15px 30px;margin-bottom:20px;background:var(--nav-bg);border-bottom:2px solid var(--nav-border)}.nav-links{display:flex;flex-wrap:wrap;gap:25px}.nav-link{color:var(--heading);text-decoration:none;font-weight:700;font-size:16px;transition:color .3s ease}.nav-link:hover{color:var(--accent)}.auth-section{display:flex;flex-wrap:wrap;align-items:center;gap:15px}.welcome-text{color:var(--accent);font-weight:700}.theme-toggle-btn{display:flex;align-items:center;justify-content:center;padding:8px 12px;border:2px solid var(--heading);border-radius:20px;background:none;font-size:18px;cursor:pointer;transition:background .3s ease,transform .3s ease}.theme-toggle-btn:hover{background:var(--heading);transform:scale(1.1)}.menu-modal-overlay{position:fixed;inset:0;display:flex;justify-content:center;align-items:center;background:var(--overlay);z-index:1000}.menu-modal-content{position:relative;width:90%;max-width:400px;padding:30px}.close-button{position:absolute;top:15px;right:15px;background:none;border:none;color:var(--accent);font-size:20px;cursor:pointer;transition:color .3s ease}.close-button:hover{color:var(--heading)}@media (max-width: 600px){.menu-nav{padding:15px 16px}}