:root{--primary-color: #4a6fa5;--primary-dark: #3a5a8c;--secondary-color: #6c757d;--light-bg: #f8f9fa;--dark-bg: #121212;--light-text: #212529;--dark-text: #e9ecef;--light-card-bg: #ffffff;--dark-card-bg: #1e1e1e;--light-border: #dee2e6;--dark-border: #333333;--codeforces-color: #1e88e5;--codechef-color: #5d4037;--leetcode-color: #ffa116;--success-color: #28a745;--error-color: #dc3545;--warning-color: #ffc107;--info-color: #17a2b8}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Roboto,Segoe UI,Arial,sans-serif;line-height:1.6;transition:background-color .3s,color .3s}body.dark-mode{background-color:var(--dark-bg);color:var(--dark-text)}body:not(.dark-mode){background-color:var(--light-bg);color:var(--light-text)}.app-container{display:flex;flex-direction:column;min-height:100vh}.main-content{flex:1;padding:2rem;max-width:1200px;margin:0 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#0000001a}.contest-card.light{background-color:var(--light-card-bg);border:1px solid var(--light-border)}.contest-card.dark{background-color:var(--dark-card-bg);border:1px solid var(--dark-border)}.card-header{display:flex;justify-content:space-between;align-items:center;padding:1rem;border-bottom:1px solid}.light .card-header{border-color:var(--light-border)}.dark .card-header{border-color:var(--dark-border)}.platform-tag{padding:.25rem .75rem;border-radius:20px;font-size:.85rem;font-weight:600;color:#fff}.platform-tag.codeforces{background-color:var(--codeforces-color)}.platform-tag.codechef{background-color:var(--codechef-color)}.platform-tag.leetcode{background-color:var(--leetcode-color)}.bookmark-btn{background:none;border:none;font-size:1.2rem;color:var(--secondary-color);cursor:pointer;transition:color .2s;padding:.25rem}.bookmark-btn:hover{color:var(--warning-color)}.contest-title{padding:1rem;font-size:1.2rem;margin:0;flex-grow:1}.contest-details{padding:0 1rem 1rem}.contest-details p{margin-bottom:.5rem}.time-remaining{color:var(--primary-color);font-weight:500}.card-actions{padding:1rem;display:flex;gap:1rem;border-top:1px solid}.light .card-actions{border-color:var(--light-border)}.dark .card-actions{border-color:var(--dark-border)}.contest-link,.solution-link{display:flex;align-items:center;gap:.5rem;padding:.5rem 1rem;border-radius:4px;font-weight:500;text-decoration:none;transition:background-color .2s}.contest-link{background-color:var(--primary-color);color:#fff}.contest-link:hover{background-color:var(--primary-dark);color:#fff;text-decoration:none}.solution-link{background-color:red;color:#fff}.solution-link:hover{background-color:#c00;color:#fff;text-decoration:none}.date-range-container{margin:.5rem 0;padding:.5rem;border-radius:6px;max-width:500px}.date-range-title{margin-bottom:.5rem;font-weight:600;color:#444;font-size:.9rem}.date-range-picker{width:100%}.date-input-wrapper{display:flex;flex-direction:row;gap:8px;width:100%}.date-input-group{display:flex;align-items:center;background-color:#f8f9fa;border:1px solid #dee2e6;border-radius:4px;padding:4px 8px;transition:all .2s ease;flex:1;height:34px}.date-input-group:hover{border-color:#adb5bd;box-shadow:0 1px 3px #0000001a}.calendar-icon{color:#6c757d;margin-right:6px;font-size:.9rem}.date-field{display:flex;flex-direction:column;flex:1}.date-field label{font-size:.75rem;color:#6c757d;margin-bottom:2px;line-height:1}.date-input{border:none;background:transparent;font-size:.85rem;color:#495057;padding:0;width:100%;line-height:1}.date-input:focus{outline:none}.dark .date-range-container{background-color:#2d3748}.dark .date-range-title{color:#e2e8f0}.dark .date-input-group{background-color:#1a202c;border-color:#4a5568}.dark .date-input-group:hover{border-color:#718096}.dark .calendar-icon,.dark .date-field label{color:#a0aec0}.dark .date-input{color:#e2e8f0}@media (max-width: 480px){.date-input-wrapper{flex-direction:column;gap:6px}.date-input-group{width:100%}}.filter-bar{border-radius:8px;background-color:#fff;box-shadow:0 2px 10px #0000000d;padding:15px;margin-bottom:20px;transition:all .3s ease}.filter-bar.light{background-color:var(--light-card-bg);border:1px solid var(--light-border)}.filter-bar.dark{background-color:#1a202c;box-shadow:0 2px 10px #0003}.filter-header{display:flex;align-items:center;margin-bottom:15px;padding-bottom:10px;border-bottom:1px solid #eee}.filter-icon{margin-right:10px;color:#5a67d8;font-size:1.1rem}.filter-header h3{font-size:1.2rem;font-weight:600;color:#2d3748;margin:0}.filter-content{display:flex;flex-direction:column;gap:20px}.filter-section{margin-bottom:5px}.filter-section h4{font-size:.95rem;font-weight:600;color:#4a5568;margin-bottom:12px}.platform-dropdown-container{position:relative;width:100%}.platform-dropdown-header{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;background-color:#f8f9fa;border:1px solid #e2e8f0;border-radius:6px;cursor:pointer;transition:all .2s ease}.platform-dropdown-header:hover{border-color:#cbd5e0;background-color:#f1f5f9}.dropdown-arrow{transition:transform .2s ease}.dropdown-arrow.open{transform:rotate(180deg)}.platform-dropdown-menu{position:absolute;top:calc(100% + 5px);left:0;width:100%;background-color:#fff;border-radius:6px;box-shadow:0 4px 12px #0000001a;z-index:10;overflow:hidden;max-height:200px;overflow-y:auto}.platform-dropdown-item{display:flex;align-items:center;padding:10px 12px;cursor:pointer;transition:background-color .2s}.platform-dropdown-item:hover{background-color:#f7fafc}.platform-dropdown-item input{margin-right:10px}.platform-name{font-size:.9rem;font-weight:500}.platform-name.codeforces{color:#1e88e5}.platform-name.codechef{color:#f57c00}.platform-name.leetcode{color:#ffa116}.status-filters{display:flex;flex-direction:column;gap:12px}.status-checkbox{display:flex;align-items:center;cursor:pointer;font-size:.9rem}.status-checkbox input{margin-right:10px}.status-checkbox span{color:#4a5568}.filter-bar.dark .filter-header{border-bottom-color:#2d3748}.filter-bar.dark .filter-icon{color:#7f9cf5}.filter-bar.dark .filter-header h3{color:#e2e8f0}.filter-bar.dark .filter-section h4{color:#a0aec0}.filter-bar.dark .platform-dropdown-header{background-color:#2d3748;border-color:#4a5568;color:#e2e8f0}.filter-bar.dark .platform-dropdown-header:hover{border-color:#718096;background-color:#2c3440}.filter-bar.dark .platform-dropdown-menu{background-color:#2d3748}.filter-bar.dark .platform-dropdown-item:hover{background-color:#364154}.filter-bar.dark .status-checkbox span{color:#cbd5e0}@media (min-width: 768px){.filter-content{flex-direction:row;flex-wrap:wrap}.filter-section{flex:1;min-width:200px}}@media (max-width: 768px){.platform-filters,.status-filters{flex-direction:column;gap:.5rem}}.navbar{display:flex;justify-content:center;align-items:center;padding:1rem 2rem;box-shadow:0 2px 4px #0000001a}.navbar-container{width:100%;max-width:1200px;display:flex;flex-direction:column}.navbar.light{background-color:var(--light-card-bg);border-bottom:1px solid var(--light-border)}.navbar.dark{background-color:var(--dark-card-bg);border-bottom:1px solid var(--dark-border)}.light .nav-header{color:var(--light-text)}.dark .nav-header{color:var(--dark-text)}.navbar-brand{text-align:center;margin-bottom:1rem}.navbar-brand h1{margin:0;font-size:1.5rem;font-weight:700}.navbar-links{display:flex;align-items:center;gap:1.5rem;justify-content:center}.nav-link{display:flex;align-items:center;gap:.5rem;font-weight:500;transition:color .2s}.light .nav-link{color:var(--light-text)}.dark .nav-link{color:var(--dark-text)}.nav-link:hover{color:var(--primary-color);text-decoration:none}.theme-toggle{background:none;border:none;font-size:1.2rem;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:.5rem;border-radius:50%;transition:background-color .2s}.light .theme-toggle{color:var(--light-text)}.dark .theme-toggle{color:var(--dark-text)}.theme-toggle:hover{background-color:#0000000d}.dark .theme-toggle:hover{background-color:#ffffff0d}@media (max-width: 768px){.navbar{padding:1rem}.navbar-container{width:100%}.navbar-brand{margin-bottom:1rem}.navbar-links{width:100%;justify-content:space-around}.nav-link span{display:none}}.admin-form{max-width:800px;margin:0 auto}.admin-form.dark{color:var(--dark-text)}.admin-form.light{color:var(--light-text)}.admin-form h2{margin-bottom:1rem;font-size:2rem}.admin-description{margin-bottom:2rem;color:var(--secondary-color)}.solution-form{padding:2rem;border-radius:8px;margin-bottom:2rem}.solution-form.light{background-color:var(--light-card-bg);border:1px solid var(--light-border)}.solution-form.dark{background-color:var(--dark-card-bg);border:1px solid var(--dark-border)}.form-group{margin-bottom:1.5rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:500}.form-group select,.form-group input{width:100%;padding:.75rem;border-radius:4px;font-size:1rem;border:1px solid}.light .form-group select,.light .form-group input{border-color:var(--light-border);background-color:var(--light-card-bg);color:var(--light-text)}.dark .form-group select,.dark .form-group input{border-color:var(--dark-border);background-color:var(--dark-card-bg);color:var(--dark-text)}.submit-btn{background-color:var(--primary-color);color:#fff;padding:.75rem 1.5rem;font-size:1rem;font-weight:500;border:none;border-radius:4px;cursor:pointer;transition:background-color .2s}.submit-btn:hover{background-color:var(--primary-dark)}.submit-status{margin-top:1.5rem;padding:1rem;border-radius:4px;text-align:center}.submit-status.success{background-color:#28a7451a;color:var(--success-color)}.submit-status.error{background-color:#dc35451a;color:var(--error-color)}.youtube-playlists{margin-top:3rem}.youtube-playlists h3{margin-bottom:1rem;font-size:1.5rem}.youtube-playlists ul{list-style-type:none}.youtube-playlists li{margin-bottom:.75rem}.youtube-playlists a{display:inline-flex;align-items:center;gap:.5rem}.bookmarked-contests{width:100%}.bookmarked-contests.dark{color:var(--dark-text)}.bookmarked-contests.light{color:var(--light-text)}.bookmarked-contests h2{margin-bottom:1.5rem;font-size:2rem}.no-bookmarks{text-align:center;padding:3rem;background-color:#6c757d1a;border-radius:8px;font-size:1.1rem;line-height:1.8}.no-bookmarks p:first-child{font-weight:600;margin-bottom:1rem}.dashboard{width:100%}.dashboard.dark{color:var(--dark-text)}.dashboard.light{color:var(--light-text)}.dashboard h2{margin-bottom:1.5rem;font-size:2rem;color:inherit}.contests-container{margin-top:2rem}.contests-section{margin-bottom:3rem}.contests-section h3{margin-bottom:1rem;font-size:1.5rem;padding-bottom:.5rem;border-bottom:1px solid;color:inherit}.light .contests-section h3{border-color:var(--light-border)}.dark .contests-section h3{border-color:var(--dark-border)}.contest-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem}.no-contests{text-align:center;padding:3rem;background-color:#6c757d1a;border-radius:8px;font-size:1.5rem;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:150px;box-shadow:0 2px 4px #0000000d;transition:all .3s ease}.dark .no-contests{background-color:#32323233;box-shadow:0 2px 4px #0003}.light .no-contests{background-color:#f0f0f0b3}.no-contests:hover{transform:translateY(-2px);box-shadow:0 4px 8px #0000001a}@media (max-width: 768px){.contest-grid{grid-template-columns:1fr}}