:root {
    --primary-color: #28A0FF;
    --secondary-color: #6C5CE7;
    --background-dark: #0A0A19;
    --card-background: #1A1A2E;
    --text-primary: #FFFFFF;
    --text-secondary: #B4B4C8;
    --success-color: #00D9A3;
    --error-color: #FF5C5C;
    --border-radius: 12px;
}

body {
    font-family: 'Rubik', sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background: linear-gradient(135deg, var(--background-dark) 0%, #0F0F23 100%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.admin-body {
    max-width: 1200px;
}

nav {
    text-align: center;
    margin-bottom: 20px;
    padding: 10px 0;
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

nav a {
    display: inline-block;
    margin: 0 15px;
    padding: 10px 15px;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border-radius: var(--border-radius);
}

nav a:hover {
    background-color: var(--secondary-color);
    color: white;
}

.content {
    flex: 1;
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 30px;
    font-weight: 600;
}

#start-screen {
    text-align: center;
    background-color: var(--card-background);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 500px;
    margin: 0 auto;
}

#start-screen p {
    color: var(--text-primary);
    font-size: 18px;
    margin-bottom: 30px;
}

#start-btn {
    padding: 15px 30px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #1E90FF 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 18px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(40, 160, 255, 0.3);
}

#start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(40, 160, 255, 0.4);
}

.question {
    background-color: var(--card-background);
    padding: 30px;
    margin-bottom: 20px;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

#timer {
    text-align: center;
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 20px;
    font-weight: bold;
}

#points {
    text-align: center;
    font-size: 20px;
    color: var(--success-color);
    margin-bottom: 20px;
    font-weight: bold;
}

#progress {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.point {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--text-secondary);
    margin: 0 5px;
    transition: background-color 0.3s ease;
}

.point.completed {
    background-color: var(--primary-color);
}

#timer {
    text-align: center;
    font-size: 18px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.point {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--text-secondary);
    margin: 0 5px;
    transition: background-color 0.3s ease;
}

.point.correct {
    background-color: var(--success-color);
}

.point.wrong {
    background-color: var(--error-color);
}

#timer {
    font-size: 24px;
    text-align: center;
    margin-bottom: 20px;
    color: var(--primary-color);
    font-weight: 500;
}

.question h3 {
    margin-top: 0;
    color: var(--text-primary);
    font-weight: 500;
    text-align: center;
}

.options {
    margin-top: 20px;
    text-align: center;
}

.option {
    display: block;
    margin-bottom: 15px;
    padding: 15px 20px;
    background: linear-gradient(135deg, var(--secondary-color) 0%, #5A4FCF 100%);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    width: 100%;
    text-align: center;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 400;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

.option:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(108, 92, 231, 0.4);
}

.option:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.option.correct {
    background: linear-gradient(135deg, var(--success-color) 0%, #00B894 100%) !important;
    color: white !important;
    box-shadow: 0 4px 15px rgba(0, 217, 163, 0.4) !important;
}

.option.wrong {
    background: linear-gradient(135deg, var(--error-color) 0%, #FF3838 100%) !important;
    color: white !important;
    box-shadow: 0 4px 15px rgba(255, 92, 92, 0.4) !important;
}

#next {
    display: block;
    margin: 30px auto 0;
    padding: 15px 30px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #1E90FF 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 18px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(40, 160, 255, 0.3);
}

#next:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(40, 160, 255, 0.4);
}

#result {
    text-align: center;
    font-size: 28px;
    margin-top: 40px;
    color: var(--text-primary);
    font-weight: 600;
}

#home {
    display: block;
    margin: 20px auto;
    padding: 12px 25px;
    background: linear-gradient(135deg, var(--secondary-color) 0%, #5A4FCF 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

#home:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(108, 92, 231, 0.4);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }
    .question, .stats, .user-management, .quiz-history, .profile-card, .balance-card {
        padding: 20px;
    }
    nav a {
        margin: 0 10px;
        padding: 8px 12px;
        font-size: 14px;
    }
    #timer {
        font-size: 20px;
    }
    .option {
        padding: 12px 15px;
        font-size: 14px;
    }
    #next {
        padding: 12px 25px;
        font-size: 16px;
    }
    #result {
        font-size: 24px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 24px;
    }
    .question, .stats, .user-management, .quiz-history, .profile-card, .balance-card {
        padding: 15px;
    }
    nav a {
        margin: 0 5px;
        padding: 6px 10px;
        font-size: 13px;
    }
    #timer {
        font-size: 18px;
    }
    .option {
        padding: 10px 12px;
        font-size: 13px;
    }
    #next {
        padding: 10px 20px;
        font-size: 14px;
    }
    #result {
        font-size: 20px;
    }
}

.profile-card, .balance-card, .quiz-history, .stats, .user-management table {
    width: 100%;
    table-layout: fixed;
}

.user-management table, .quiz-history table {
    border-collapse: collapse;
}

.user-management th, .user-management td, .quiz-history th, .quiz-history td {
    border: 1px solid var(--text-secondary);
    padding: 10px;
    text-align: left;
}

.user-management th, .quiz-history th {
    background-color: var(--card-background);
    font-weight: 600;
}

.user-management th, .user-management td {
    word-wrap: break-word;
}

.auth-form {
    max-width: 400px;
    margin: 0 auto;
    background-color: var(--card-background);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--text-secondary);
    border-radius: var(--border-radius);
    background-color: var(--background-dark);
    color: var(--text-primary);
    font-size: 16px;
    transition: border-color 0.3s ease;
    box-sizing: border-box;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(40, 160, 255, 0.1);
}

.home-buttons {
    text-align: center;
    margin-top: 30px;
}

.home-buttons .btn {
    margin: 0 10px;
}

.btn {
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #1E90FF 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    margin: 5px;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(40, 160, 255, 0.4);
}

.status-active {
    color: var(--success-color);
    font-weight: bold;
}

.status-suspended {
    color: var(--error-color);
    font-weight: bold;
}

.btn-small {
    padding: 5px 10px;
    font-size: 12px;
}

.btn-suspend {
    padding: 5px 10px;
    background: linear-gradient(135deg, #FF9800 0%, #F57C00 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 12px;
    margin: 2px;
    transition: all 0.3s ease;
}

.btn-suspend:hover {
    background: linear-gradient(135deg, #F57C00 0%, #E65100 100%);
}

.btn-delete {
    padding: 5px 10px;
    background: linear-gradient(135deg, var(--error-color) 0%, #D32F2F 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 12px;
    margin: 2px;
    transition: all 0.3s ease;
}

.btn-delete:hover {
    background: linear-gradient(135deg, #D32F2F 0%, #B71C1C 100%);
}

.pagination a, .pagination span {
    margin: 0 5px;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
}

.pagination a {
    padding: 8px 12px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #1E90FF 100%);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

.pagination a:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(40, 160, 255, 0.4);
}

.pagination span {
    font-weight: 500;
    color: var(--text-primary);
}

.search-form {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    align-items: center;
}

.search-input {
    padding: 10px 15px;
    border: 1px solid var(--text-secondary);
    border-radius: var(--border-radius);
    background-color: var(--card-background);
    color: var(--text-primary);
    font-size: 16px;
    flex: 1;
    max-width: 300px;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(40, 160, 255, 0.5);
}

.search-btn {
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #1E90FF 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(40, 160, 255, 0.4);
}

.admin-actions {
    text-align: center;
    margin-bottom: 20px;
}

.quiz-actions {
    text-align: center;
    margin-top: 20px;
}

.stats, .user-management, .quiz-history, .profile-card, .balance-card {
    background-color: var(--card-background);
    padding: 30px;
    margin-bottom: 20px;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-sizing: border-box;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
    box-sizing: border-box;
}

table th, table td {
    padding: 10px;
    text-align: left;
    border-bottom: 1px solid var(--text-secondary);
}

table th {
    background-color: var(--secondary-color);
    color: white;
}

.error {
    color: var(--error-color);
    text-align: center;
}

.success {
    color: var(--success-color);
    text-align: center;
}