:root {
    --primary-color: #4361ee;
    --primary-light: #4895ef;
    --secondary-color: #3f37c9;
    --accent-color: #f72585;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --light-gray: #e9ecef;
    
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --light-color: #212529;
    --dark-color: #f8f9fa;
    --light-gray: #343a40;
    --gray-color: #adb5bd;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--light-color);
    color: var(--dark-color);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--light-gray);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    font-size: 2rem;
    color: var(--primary-color);
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

h3 {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--primary-color);
}

nav {
    display: flex;
    gap: 15px;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    transition: var(--transition);
}

#theme-toggle {
    font-size: 1.2rem;
    color: var(--gray-color);
    background: none;
    padding: 5px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#theme-toggle:hover {
    background-color: var(--light-gray);
    color: var(--primary-color);
}

.tabs {
    display: flex;
    gap: 5px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--light-gray);
}

.tab {
    padding: 10px 20px;
    background-color: var(--light-gray);
    border: none;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    font-weight: 500;
    color: var(--gray-color);
}

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

.tab-content {
    display: none;
    padding: 20px 0;
}

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

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

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

input, select, textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--light-color);
    color: var(--dark-color);
}

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

small {
    display: block;
    margin-top: 5px;
    font-size: 0.8rem;
    color: var(--gray-color);
}

.style-options {
    margin: 25px 0;
}

.style-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 10px;
}

.style-btn {
    padding: 8px 15px;
    border-radius: 20px;
    background-color: var(--light-gray);
    color: var(--gray-color);
    font-weight: 500;
    font-size: 0.9rem;
}

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

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 12px 25px;
    border-radius: var(--border-radius);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.secondary-btn {
    background-color: var(--light-gray);
    color: var(--dark-color);
    padding: 12px 25px;
    border-radius: var(--border-radius);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

.secondary-btn:hover {
    background-color: #d3d9df;
}

.results-section {
    background-color: var(--light-gray);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    margin-top: 30px;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--light-gray);
    color: var(--gray-color);
}

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

.citation-result {
    background-color: var(--light-color);
    padding: 20px;
    border-radius: var(--border-radius);
    min-height: 80px;
}

/* Responsive styles */
@media (max-width: 768px) {
    .form-actions {
        flex-direction: column;
    }
    
    .primary-btn, .secondary-btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .style-buttons {
        flex-direction: column;
    }
    
    .style-btn {
        width: 100%;
    }
}