/* Основные стили */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

header {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    position: relative;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

header h1 a {
    color: white;
    text-decoration: none;
    font-size: 1.8rem;
    font-weight: bold;
    transition: transform 0.3s;
}

header h1 a:hover {
    transform: scale(1.05);
}

header nav {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

header nav a {
    color: white;
    text-decoration: none;
    padding: 0.75rem 1.25rem;
    border-radius: 50px;
    transition: all 0.3s ease;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
}

header nav a:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

main {
    min-height: calc(100vh - 120px);
    padding: 2rem 0;
}

footer {
    background: linear-gradient(135deg, #2575fc 0%, #6a11cb 100%);
    color: white;
    padding: 2rem 0;
    text-align: center;
    margin-top: auto;
}

.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    border: none;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(37, 117, 252, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, #6c757d 0%, #495057 100%);
    color: white;
    border: none;
}

.btn-secondary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(108, 117, 125, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
    color: white;
    border: none;
}

.btn-danger:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(220, 53, 69, 0.4);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: #495057;
    font-size: 1.1rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.875rem 1.25rem;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #6a11cb;
    box-shadow: 0 0 0 3px rgba(106, 17, 203, 0.2);
    transform: translateY(-2px);
}

.alert {
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    border-radius: 10px;
    font-weight: 500;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.hero {
    text-align: center;
    padding: 4rem 0;
    background: white;
    border-radius: 20px;
    margin: 2rem 0;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: #343a40;
    font-weight: 700;
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    color: #6c757d;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #f1f3f4;
}

.feature:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
}

.feature h3 {
    margin-bottom: 1rem;
    color: #6a11cb;
    font-size: 1.4rem;
    font-weight: 600;
}

.feature p {
    color: #6c757d;
    line-height: 1.6;
}

.auth-container {
    max-width: 450px;
    margin: 3rem auto;
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    border: 1px solid #f1f3f4;
}

.auth-link {
    text-align: center;
    margin-top: 1.5rem;
    color: #6c757d;
}

.auth-link a {
    color: #6a11cb;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.auth-link a:hover {
    color: #2575fc;
    text-decoration: underline;
}

.leaderboard-table,
.stats-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    margin: 1rem 0;
}

.leaderboard-table th,
.leaderboard-table td,
.stats-table th,
.stats-table td {
    padding: 1.25rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.leaderboard-table th,
.stats-table th {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    font-weight: 600;
    font-size: 1.1rem;
}

.leaderboard-table tbody tr:hover {
    background-color: #f8f9ff;
    transform: scale(1.01);
    transition: all 0.2s ease;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.pagination a {
    display: inline-block;
    padding: 0.75rem 1.25rem;
    border: 2px solid #e9ecef;
    text-decoration: none;
    color: #6a11cb;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.pagination a.active {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    border-color: #6a11cb;
    transform: scale(1.05);
}

.pagination a:hover {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    transform: scale(1.05);
}

.filter-form {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    align-items: end;
    flex-wrap: wrap;
    background: white;
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.05);
}

.admin-menu {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.admin-btn {
    display: block;
    padding: 1.5rem;
    background: white;
    border: 1px solid #e9ecef;
    border-radius: 15px;
    text-decoration: none;
    color: #333;
    text-align: center;
    transition: all 0.3s;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.admin-btn:hover {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    border-color: #6a11cb;
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(106, 17, 203, 0.3);
}

.errors-container pre {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 10px;
    overflow-x: auto;
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid #e9ecef;
    font-family: 'Courier New', monospace;
    line-height: 1.5;
}

/* Медиазапросы для разных размеров экранов */

/* Мобильные телефоны (320px - 480px) */
@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }

    header .container {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    header h1 a {
        font-size: 1.5rem;
    }

    header nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }

    header nav a {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .hero {
        padding: 2rem 1rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .cta-buttons {
        flex-direction: column;
        gap: 1rem;
    }

    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }

    .features {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .feature {
        padding: 1.5rem;
    }

    .auth-container {
        margin: 1rem;
        padding: 1.5rem;
    }

    .form-group input,
    .form-group select {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }

    .form-group label {
        font-size: 1rem;
    }

    .leaderboard-table th,
    .leaderboard-table td,
    .stats-table th,
    .stats-table td {
        padding: 0.75rem 0.5rem;
        font-size: 0.9rem;
    }

    .pagination {
        flex-direction: column;
        gap: 0.5rem;
    }

    .pagination a {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .filter-form {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .admin-menu {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .admin-btn {
        padding: 1rem;
    }

    .errors-container pre {
        padding: 1rem;
        font-size: 0.8rem;
    }
}

/* Планшеты (768px) */
@media (min-width: 481px) and (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    header .container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    header h1 a {
        font-size: 1.8rem;
    }

    header nav {
        gap: 1rem;
    }

    header nav a {
        padding: 0.75rem 1.25rem;
        font-size: 1rem;
    }

    .hero {
        padding: 3rem 1.5rem;
    }

    .hero h2 {
        font-size: 2.2rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .cta-buttons {
        gap: 1.2rem;
    }

    .features {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 1.5rem;
    }

    .feature {
        padding: 1.75rem;
    }

    .auth-container {
        margin: 2rem auto;
        padding: 2rem;
        max-width: 400px;
    }

    .leaderboard-table th,
    .leaderboard-table td,
    .stats-table th,
    .stats-table td {
        padding: 1rem;
        font-size: 1rem;
    }

    .pagination {
        gap: 0.75rem;
    }

    .pagination a {
        padding: 0.75rem 1.25rem;
        font-size: 1rem;
    }

    .filter-form {
        gap: 1.2rem;
        padding: 1.25rem;
    }

    .admin-menu {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1.2rem;
    }

    .admin-btn {
        padding: 1.25rem;
    }
}

/* Ноутбуки / маленькие десктопы (1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        max-width: 960px;
        padding: 0 20px;
    }

    header .container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    header h1 a {
        font-size: 2rem;
    }

    header nav {
        gap: 1.2rem;
    }

    header nav a {
        padding: 0.875rem 1.5rem;
        font-size: 1.1rem;
    }

    .hero {
        padding: 4rem 2rem;
    }

    .hero h2 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.2rem;
    }

    .cta-buttons {
        gap: 1.5rem;
    }

    .features {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 2rem;
    }

    .feature {
        padding: 2rem;
    }

    .auth-container {
        margin: 3rem auto;
        padding: 2.5rem;
        max-width: 450px;
    }

    .leaderboard-table th,
    .leaderboard-table td,
    .stats-table th,
    .stats-table td {
        padding: 1.25rem;
        font-size: 1.1rem;
    }

    .pagination {
        gap: 1rem;
    }

    .pagination a {
        padding: 0.875rem 1.5rem;
        font-size: 1.1rem;
    }

    .filter-form {
        gap: 1.5rem;
        padding: 1.5rem;
    }

    .admin-menu {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 1.5rem;
    }

    .admin-btn {
        padding: 1.5rem;
    }
}

/* Стандартные десктопы (1280px) */
@media (min-width: 1025px) and (max-width: 1280px) {
    .container {
        max-width: 1200px;
        padding: 0 25px;
    }

    header .container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    header h1 a {
        font-size: 2.2rem;
    }

    header nav {
        gap: 1.5rem;
    }

    header nav a {
        padding: 1rem 1.75rem;
        font-size: 1.2rem;
    }

    .hero {
        padding: 5rem 2.5rem;
    }

    .hero h2 {
        font-size: 2.8rem;
    }

    .hero p {
        font-size: 1.3rem;
    }

    .cta-buttons {
        gap: 2rem;
    }

    .features {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 2.5rem;
    }

    .feature {
        padding: 2.5rem;
    }

    .auth-container {
        margin: 4rem auto;
        padding: 3rem;
        max-width: 500px;
    }

    .leaderboard-table th,
    .leaderboard-table td,
    .stats-table th,
    .stats-table td {
        padding: 1.5rem;
        font-size: 1.2rem;
    }

    .pagination {
        gap: 1.2rem;
    }

    .pagination a {
        padding: 1rem 1.75rem;
        font-size: 1.2rem;
    }

    .filter-form {
        gap: 2rem;
        padding: 2rem;
    }

    .admin-menu {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 2rem;
    }

    .admin-btn {
        padding: 2rem;
    }
}

/* Очень широкие экраны (1440px+) */
@media (min-width: 1281px) {
    .container {
        max-width: 1400px;
        padding: 0 30px;
    }

    header .container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    header h1 a {
        font-size: 2.5rem;
    }

    header nav {
        gap: 2rem;
    }

    header nav a {
        padding: 1.25rem 2rem;
        font-size: 1.3rem;
    }

    .hero {
        padding: 6rem 3rem;
    }

    .hero h2 {
        font-size: 3rem;
    }

    .hero p {
        font-size: 1.4rem;
    }

    .cta-buttons {
        gap: 2.5rem;
    }

    .features {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 3rem;
    }

    .feature {
        padding: 3rem;
    }

    .auth-container {
        margin: 5rem auto;
        padding: 3.5rem;
        max-width: 550px;
    }

    .leaderboard-table th,
    .leaderboard-table td,
    .stats-table th,
    .stats-table td {
        padding: 1.75rem;
        font-size: 1.3rem;
    }

    .pagination {
        gap: 1.5rem;
    }

    .pagination a {
        padding: 1.25rem 2rem;
        font-size: 1.3rem;
    }

    .filter-form {
        gap: 2.5rem;
        padding: 2.5rem;
    }

    .admin-menu {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 2.5rem;
    }

    .admin-btn {
        padding: 2.5rem;
    }
}