:root {
    --header-background: #f8f9fa;  
    --header-color: #1a1a1a;      
    --header-height: 80px;

    --primary-background: #ffffff; 
    --secondary-background: #f0f0f0; 
    --tertiary-background: #e0e0e0; 
    --text-color: #1a1a1a;         
    --note-color: #333333;
    --border-color: #cccccc;       
    --shadow-color: #00000020;     
    --box-shadow-color: #00000033;

    --btn-background: #fff;
    --btn-background-hover: #cfcfcf;
    --btn-color: #000;

    --btn-background-red: #ee8787;
    --btn-background-red-hover: #c27c7c;

    --link-color: #083577; /* #144793 */ 
    --link-color-hover: #184c9b;
    --link-color-visited: #3d72c2;
}

.dark {
    --header-background: #1A1A1A; 
    --header-color: #ebebeb;
    --header-height: 80px;
    
    --primary-background: #121212; 
    --secondary-background: #1F1F1F;  
    --tertiary-background: #333333; 
    --text-color: #fff; 
    --note-color: #ccc;
    --border-color: #383838; 
    --shadow-color: #00000080;
    --box-shadow-color: #0000009d; 

    --btn-background: #252525;
    --btn-background-hover: #181818;
    --btn-color: #000;

    --btn-background-red: #A82222;
    --btn-background-red-hover: #8f3a3a;

    --link-color: #AECCF9;
    --link-color-hover: #5b769e;
    --link-color-visited:#8faad4;
}

body, html {
    font-family: Arial, Helvetica, sans-serif;
    color: var(--text-color);
    background: linear-gradient(135deg, var(--primary-background), var(--secondary-background));
    
    min-height: 100vh;
     height: auto;
     width: 100%;
     box-sizing: border-box;
}

img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: 0 42%;
}

a {
    color: var(--link-color);
    font-weight: bold;
}
a:hover, a:visited:hover {
    color: var(--link-color-hover);
    text-decoration: underline;
}
a:visited {
    color: var(--link-color-visited);
}

h1, p {
    color: var(--text-color);
}

.btn {
    text-align: center;            
    text-decoration: none;         

    width: 10rem;
    margin: 1rem auto;              
    padding: 0.5rem 1rem;           

    font-weight: bold;            
    color: var(--text-color) !important;               
    background-color: var(--btn-background);       
    
    cursor: pointer;               
    
    border-radius: 0.5rem;          
    box-shadow: 0 4px 16px var(--box-shadow-color);
}
.btn:hover {
    background-color: var(--btn-background-hover);
    text-decoration: none;
}

.content {
    /* ALIGNMENT */
    width: 90%;
    margin: 2rem auto;
    padding: 2rem;
    
    /* STYLING */
    background-color: var(--secondary-background);
    color: var(--text-color);
    
    /* BORDER */
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
}
.max-size {
    height: 100%;
    margin: 0;
    padding: 0;
}

.toggle {
    position: sticky;
    bottom: 0.5rem;
    right: 0.5rem;
    
    display: block;
    padding: 0;
    margin: 0;
    margin-left: auto;
    
    width: 3rem;
    height: 3rem;

    
    background: var(--tertiary-background);
    color: var(--text-color);
    
    border: 2px solid var(--border-color);
    border-radius: 50%;
    
    cursor: pointer;
    
    font-size: 1.2rem;
    
    box-shadow: 0 4px 8px var(--shadow-color);
    transition: background 0.3s ease, color 0.3s ease;
}

.skip {
    position: absolute;
    top: -1000px;
    left: -1000px;
    background: #000;
    color: #fff;
    padding: 0.5rem;
    z-index: 100;
}
.skip:focus {
    top: 10px;
    left: 10px;
}