:root {
    --page-background-color: #ffffff; 
    --column-background-color: #fafafa;
    --column-border-color: #ddd;
    --column-border-radius: 5px;
    --column-title-color: #000;
    --column-title-font-size: 1.2rem;
    --column-text-color: #000;

    --border-color: #ccc;
    --border-width: 1px;
    --border-style: solid;
    --message-box-border-radius: 10px;
    --form-border-radius: 8px;
    --placeholder-text-color: #999;

    --btn-text-shadow-color: #1a1500;
    --btn-main-background-color: rgb(245, 202, 11);
    --btn-main-color: black;
    --word-title_color: rgb(219, 150, 1);

    --navbar-height: 79px;

    --option-correct-background-color: #d4edda;
    --option-correct-select-background-color: #28a745;
    --option-selected-background-color: #dc3545;

}

body {
    background-color: #ffface;  
    margin: 0px auto;
    font-family: "Helvetica", "Arial", sans-serif;
    min-width: 1000px;
}

form {
    max-width: 400px;
    margin: 2rem auto;
    padding: 2rem 2.5rem;
    border: 1px solid var(--column-border-color);
    border-radius: var(--form-border-radius);
    background-color: var(--column-background-color);
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

select {
    width: 100%;
    padding: 12px 15px;
    margin: 15px 0;
    border: 1px solid #ccc;
    border-radius: var(--column-border-radius);
    box-sizing: border-box;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

select:focus {
    border-color: #007bff;
    outline: none;
}

.page_num {
    font-size: 1rem;
    font-weight: bold;
}

.little-btn,
#edit-btn,
.page_btn {
    padding: 5px 10px;
    margin: 0px 10px;
    background-color: var(--btn-main-background-color);
    color: rgb(0, 0, 0);
    font-size: 1rem;
    width: 70px;
    text-decoration: none;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-weight: bolder;
    display: inline-block;
    transition: background-color 0.3s ease;
}

.little-btn {
    letter-spacing: 0.2rem; 
    width: auto;
    padding: 0.2rem 0.5rem;
    margin: 0.2rem 0rem 0.2rem 1rem;
    border-radius: 0.5rem;
    background-color: none;
    font-weight: 400;
    background-color: #ebebeb;
}

.back-quiz-btn {
    width: 6rem;
    display: inline-block;
    background-color: var(--btn-main-background-color);
}

.page_btn.disabled {
  background-color: #eee;
  color: #999;
  border-color: #ccc;
  cursor: default;
  pointer-events: none; 
}

.back-btn,
.home-btn,
.sign-btn,
.quiz-btn {
    text-align: center;
    display: block;
    width: 100%;
    padding: 14px;
    margin: 15px 0 0 0;
    background-color: var(--btn-main-background-color);
    color: rgb(0, 0, 0);
    letter-spacing: 4px;
    font-size: 1.2rem;
    border: none;
    border-radius: 7px;
    cursor: pointer;
    font-weight: bolder;
    transition: background-color 0.3s ease;
    text-decoration: none;
}

.back-btn:hover,
.left-quiz:hover,
.page_btn:hover,
.home-btn:hover,
.sign-btn:hover,
.quiz-btn:hover {
    background-color: rgb(224, 184, 1);
}