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

:root {
    --primary-color: #4361ee;
    --secondary-color: #3a0ca3;
    --success-color: #4CAF50;
    --danger-color: #f44336;
    --warning-color: #FF9800;
    --info-color: #2196F3;
    --light-bg: #f8f9fa;
    --dark-bg: #2d3748;
    --text-color: #333;
    --text-light: #666;
    --border-color: #e1e4e8;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-color);
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-card {
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.auth-card h1 {
    color: var(--primary-color);
    margin-bottom: 30px;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 16px;
    transition: all 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--light-bg);
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

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

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

.error-message {
    color: var(--danger-color);
    padding: 10px;
    border-radius: 5px;
    background-color: rgba(244, 67, 54, 0.1);
    margin-top: 10px;
}

/* Dashboard Styles */
.dashboard {
    background: var(--light-bg);
    min-height: 100vh;
}

.header {
    background: white;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left h1 {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-left p {
    color: var(--text-light);
    margin-top: 5px;
}

.main-content {
    padding: 30px;
    max-width: 1400px;
    margin: 0 auto;
}

.controls {
    background: white;
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
}

.period-selector {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.period-selector h3 {
    display: flex;
    align-items: center;
    gap: 10px;
}

.select-control {
    padding: 10px 20px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    background: white;
    cursor: pointer;
}

.date-range {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.date-input {
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
}

.stat-content h3 {
    font-size: 28px;
    margin-bottom: 5px;
    color: var(--text-color);
}

.stat-content p {
    color: var(--text-light);
    font-size: 14px;
}

.charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.chart-container {
    background: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.chart-container h3 {
    margin-bottom: 20px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.chart-container.full-width {
    grid-column: 1 / -1;
}

.detailed-stats {
    background: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

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

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: none;
    color: var(--text-light);
    cursor: pointer;
    font-weight: 600;
    border-radius: 8px;
    transition: all 0.3s;
}

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

.tab-content {
    display: none;
}

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

table {
    width: 100%;
    border-collapse: collapse;
}

thead {
    background: var(--light-bg);
}

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

th {
    font-weight: 600;
    color: var(--text-color);
}

.events-list {
    background: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.events-filter {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.filter-btn {
    padding: 8px 16px;
    border: 2px solid var(--border-color);
    background: none;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

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

#eventsContainer {
    display: grid;
    gap: 10px;
}

.event-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    transition: all 0.3s;
}

.event-item:hover {
    border-color: var(--primary-color);
    transform: translateX(5px);
}

.event-type {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.event-type.start { background-color: var(--success-color); }
.event-type.stop { background-color: var(--warning-color); }
.event-type.misstake { background-color: var(--danger-color); }

.event-content {
    flex: 1;
}

.event-time {
    color: var(--text-light);
    font-size: 12px;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .main-content {
        padding: 15px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .period-selector {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Loading Animation */
.loading {
    text-align: center;
    padding: 40px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}