:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --text-color: #333;
    --bg-light: #fff;
    --bg-dark: #f4f7fa;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    min-height: 100vh;
    color: var(--text-color);
}

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

.header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

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

.stat-card {
    background: var(--bg-light);
    border-radius: 15px;
    padding: 25px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    color: #666;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.chart-container,
.pages-list {
    background: var(--bg-light);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.chart-title {
    font-size: 1.2rem;
    margin-bottom: 20px;
}

.page-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid #eee;
}

.page-item:last-child {
    border-bottom: none;
}

.page-url {
    font-weight: 500;
    color: var(--primary-color);
    word-break: break-all;
}

.page-views {
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    flex-shrink: 0;
    margin-left: 10px;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
    justify-content: center;
}

.btn {
    background: white;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 10px 20px;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

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

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

.loading,
.error {
    text-align: center;
    color: white;
    font-size: 1.2rem;
    margin: 50px 0;
    padding: 15px;
    border-radius: 10px;
}

.error {
    background: #ff6b6b;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: #fefefe;
    margin: 10% auto;
    padding: 20px;
    border-radius: 15px;
    width: 80%;
    max-width: 800px;
    position: relative;
}

.close-btn {
    color: #aaa;
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}