:root {
    --color-primary: #007bff;
    --color-primary-dark: #0056b3;
    --color-secondary: #333;
    --color-background: #f9f9f9;
    --color-white: #fff;
    --color-grey-light: #e0e0e0;
    --color-grey-dark: #777;
    --color-border: #ddd;

    --color-dark-background: #121212;
    --color-dark-primary: #bb86fc;
    --color-dark-secondary: #03dac6;
    --color-dark-text: #e0e0e0;
    --color-dark-border: #333;
    --color-dark-white: #222;

    --font-family: Arial, sans-serif;
    --font-size-base: 16px;
    --font-size-large: 20px;
    --font-size-xlarge: 24px;
    --font-size-xxlarge: 36px;
    --font-size-small: 14px;

    --spacing-small: 10px;
    --spacing-medium: 20px;
    --spacing-large: 40px;
    --spacing-xlarge: 60px;

    --border-radius: 4px;
    --border-radius-large: 8px;
    --transition-time: 0.3s;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    background-color: var(--color-background);
    color: var(--color-secondary);
    transition: background-color var(--transition-time), color var(--transition-time);
}

.container {
    width: 80%;
    margin: 0 auto;
}

header {
    background-color: var(--color-white);
    padding: var(--spacing-medium) 0;
    border-bottom: 2px solid var(--color-border);
}

.logo h1 {
    font-size: var(--font-size-xlarge);
    font-weight: bold;
}

nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-medium);
}

nav a {
    text-decoration: none;
    color: var(--color-secondary);
    font-size: var(--font-size-large);
    padding: var(--spacing-small);
    transition: color var(--transition-time);
}

nav a:hover,
nav a.active {
    color: var(--color-primary);
}

.intro {
    text-align: center;
    padding: var(--spacing-xlarge) 0;
}

.intro h2 {
    font-size: var(--font-size-xxlarge);
    margin-bottom: var(--spacing-small);
}

.intro p {
    font-size: var(--font-size-large);
    color: var(--color-grey-dark);
}

.featured-work {
    padding: var(--spacing-large) 0;
}

.featured-work h3 {
    font-size: var(--font-size-xlarge);
    margin-bottom: var(--spacing-medium);
    text-align: center;
}

.work-grid {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-medium);
}

.work-item {
    flex: 1;
    text-align: center;
    padding: var(--spacing-medium);
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-large);
    transition: transform var(--transition-time), box-shadow var(--transition-time);
}

.work-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.work-thumbnail {
    width: 100%;
    height: 200px;
    background-color: var(--color-grey-light);
    margin-bottom: var(--spacing-small);
    object-fit: cover;
    border-radius: var(--border-radius-large);
}

.work-item h4 {
    font-size: var(--font-size-large);
    color: var(--color-secondary);
}

.portfolio-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr); 
    gap: var(--spacing-medium); 
    padding: var(--spacing-large) 0;
}

.portfolio-item {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    padding: var(--spacing-medium);
    text-align: center;
    transition: transform var(--transition-time), box-shadow var(--transition-time);
}

.portfolio-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.portfolio-thumbnail {
    width: 100%;
    height: 200px;
    background-color: var(--color-grey-light);
    margin-bottom: var(--spacing-small);
}

.portfolio-item h4 {
    font-size: var(--font-size-large);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-small);
}

.portfolio-item p {
    font-size: var(--font-size-base);
    color: var(--color-grey-dark);
}

footer {
    background-color: var(--color-secondary);
    color: var(--color-white);
    padding: var(--spacing-medium) 0;
    text-align: center;
    margin-top: var(--spacing-large);
}

footer p {
    margin-bottom: var(--spacing-small);
}

footer .social-media a {
    color: var(--color-white);
    margin: 0 var(--spacing-small);
    text-decoration: none;
    transition: color var(--transition-time);
}

footer .social-media a:hover {
    color: var(--color-primary);
}

@media (max-width: 1024px) {
    nav ul {
        gap: 15px;
    }

    .work-grid {
        flex-wrap: wrap;
    }

    .work-item {
        flex: 1 1 48%; 
        margin-bottom: var(--spacing-medium);
    }

    .intro h2 {
        font-size: 32px;
    }

    .intro p {
        font-size: 18px;
    }

    .portfolio-gallery {
        grid-template-columns: repeat(2, 1fr); 
    }
}

@media (max-width: 768px) {
    .container {
        width: 90%; 
    }

    nav ul {
        flex-direction: column;
        gap: 10px;
    }

    nav a {
        font-size: 16px;
    }

    .work-grid {
        flex-direction: column;
    }

    .work-item {
        width: 100%; 
    }

    .intro h2 {
        font-size: 28px;
    }

    .intro p {
        font-size: 16px;
    }

    .work-thumbnail {
        height: 150px; 
    }

    .portfolio-gallery {
        grid-template-columns: 1fr; 
    }

    .portfolio-thumbnail {
        height: 150px; 
    }
}

@media (max-width: 480px) {
    header {
        padding: 10px 0;
    }

    .logo h1 {
        font-size: 20px;
    }

    nav a {
        font-size: var(--font-size-small);
    }

    .intro h2 {
        font-size: 24px;
    }

    .intro p {
        font-size: var(--font-size-small);
    }
}

.contact-form {
    padding: var(--spacing-large) 0;
}

.contact-form form {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    padding: var(--spacing-medium);
    border-radius: var(--border-radius-large);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: var(--spacing-small);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-small);
    font-weight: bold;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-small);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
}

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

button {
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
    padding: var(--spacing-small) var(--spacing-medium);
    border-radius: var(--border-radius);
    font-size: var(--font-size-large);
    cursor: pointer;
    transition: background-color var(--transition-time);
}

button:hover {
    background-color: var(--color-primary-dark);
}

.dark-mode {
    background-color: var(--color-dark-background);
    color: var(--color-dark-text);
}

.dark-mode header {
    background-color: var(--color-dark-white);
    border-bottom: 2px solid var(--color-dark-border);
}

.dark-mode nav a {
    color: var(--color-dark-text);
}

.dark-mode nav a:hover,
.dark-mode nav a.active {
    color: var(--color-dark-primary);
}

.dark-mode .intro p {
    color: var(--color-dark-text);
}

.dark-mode .work-item,
.dark-mode .portfolio-item {
    background-color: var(--color-dark-white);
    border: 1px solid var(--color-dark-border);
}

.dark-mode .footer {
    background-color: var(--color-dark-border);
}

.dark-mode footer {
    background-color: var(--color-dark-secondary);