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

:root {
    --primary-color: #6366f1;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    padding: 40px 20px 20px;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.tagline {
    font-size: 1rem;
    color: var(--text-secondary);
    font-style: italic;
}

#user-display {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Login Modal */
.login-content {
    max-width: 400px;
}

.login-content h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    text-align: center;
}

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

#login-error {
    margin-bottom: 15px !important;
    padding: 10px;
    border-radius: 6px;
    background-color: #ffebee;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin: 20px 0;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s;
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Tab Content */
.tab-content {
    display: none;
    background: var(--surface);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.tab-content.active {
    display: block;
}

.tab-content h2 {
    margin-bottom: 25px;
    color: var(--text-primary);
}

/* Forms */
.score-form {
    max-width: 600px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    transition: border-color 0.3s;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Suggestions */
.suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface);
    border: 2px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 8px 8px;
    max-height: 200px;
    overflow-y: auto;
    z-index: 100;
    display: none;
}

.suggestions.active {
    display: block;
}

.suggestion-item {
    padding: 12px 16px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.suggestion-item:hover {
    background-color: var(--background);
}

.suggestion-item.new {
    color: var(--primary-color);
    font-weight: 600;
    border-top: 1px solid var(--border-color);
}

/* Buttons */
button {
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #4f46e5;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #475569;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* Filters */
.filters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--background);
    border-radius: 8px;
}

.filter-group {
    display: flex;
    flex-direction: column;
}

.filter-group label {
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.checkbox-group {
    flex-direction: row;
    align-items: center;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 0;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    padding: 0;
    margin: 0;
    cursor: pointer;
}

/* Results */
.results-container {
    margin-top: 20px;
}

.results-container .placeholder {
    text-align: center;
    color: var(--text-secondary);
    padding: 40px;
}

.score-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.score-table thead {
    background-color: var(--primary-color);
    color: white;
}

.score-table th,
.score-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.score-table tbody tr:hover {
    background-color: var(--background);
}

.score-table th {
    font-weight: 600;
}

/* High Scores */
.highscores-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.highscore-card {
    background: var(--background);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.highscore-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
}

.highscore-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: var(--primary-color);
}

.highscore-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.highscore-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.highscore-score {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--success-color);
    line-height: 1;
}

.highscore-player {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 600;
}

.highscore-player::before {
    content: '🏆 ';
}

.highscore-date {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.highscore-date::before {
    content: '📅 ';
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--surface);
    padding: 30px;
    border-radius: 12px;
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-lg);
}

.modal-content h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

.modal-content p {
    margin-bottom: 25px;
    color: var(--text-secondary);
}

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .tabs {
        flex-direction: column;
    }

    .tab-btn {
        width: 100%;
        text-align: left;
    }

    .filters {
        grid-template-columns: 1fr;
    }

    .score-table {
        font-size: 0.9rem;
    }

    .score-table th,
    .score-table td {
        padding: 8px;
    }
}

/* Loading State */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.loading::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}