/* CSS Variables for consistent theming */
:root {
    --primary-color: #2c5aa0;
    --secondary-color: #4a90e2;
    --accent-color: #ff6b6b;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* Reset and base styles */
* {
    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-color: #f5f7fa;
    padding: 0;
    margin: 0;
}

/* Container for responsive layout with left margin */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Create run button styles */
.create-run-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background-color: var(--accent-color);
    color: white;
    font-size: 2rem;
    font-weight: bold;
    text-decoration: none;
    border-radius: 50%;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    margin-bottom: 1rem;
}

.create-run-button:hover {
    transform: scale(1.1);
    background-color: #ff5252;
}

/* Header styles */
header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
    box-shadow: var(--box-shadow);
}

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

h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

h2 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

/* Navigation */
nav ul {
    display: flex;
    list-style: none;
    gap: 1rem;
    flex-wrap: wrap;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

nav a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Main content */
main {
    padding: 2rem 0;
}

/* Article styles */
article {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

article:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

/* Form styles */
form {
    background-color: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

p {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
    color: var(--dark-color);
}

input[type="text"],
input[type="datetime-local"],
input[type="number"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
}

button, a.button {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    text-decoration: none;
    font-size: 1rem;
    font-weight: bold;
    transition: var(--transition);
}

button:hover, a.button:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.btn-danger {
    background-color: var(--accent-color);
}

.btn-danger:hover {
    background-color: #ff5252;
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Alerts and errors */
.error {
    background-color: #f8d7da;
    color: #721c24;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    border: 1px solid #f5c6cb;
}

.success {
    background-color: #d4edda;
    color: #155724;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    border: 1px solid #c3e6cb;
}

/* Participant list */
.participants {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.participant-tag {
    background-color: var(--light-color);
    padding: 0.25rem 0.5rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

/* Responsive design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    nav ul {
        justify-content: center;
        margin-top: 1rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    h2 {
        font-size: 1.2rem;
    }
    
    article {
        padding: 1rem;
    }
    
    form {
        padding: 1rem;
    }
    
    .container {
        padding: 0 10px;
    }
}

@media (max-width: 480px) {
    main {
        padding: 1rem 0;
    }
    
    h1 {
        font-size: 1.3rem;
    }
    
    button, a.button {
        width: 100%;
        margin-bottom: 0.5rem;
        text-align: center;
    }
}

/* Pace display styling */
.pace-display {
    display: inline-block;
    background-color: var(--light-color);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-family: monospace;
    margin: 0 0.25rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 1rem;
    background-color: var(--dark-color);
    color: white;
    margin-top: 2rem;
}