ol > li::marker {
    font-weight: bold;
}

:root {
    --layout-validity-color: #16a085;
    --layout-display-color: #d67f3e;
    --layout-design-color: #9b59b6;
    --layout-navigation-color: #4a90e2;
    --layout-speed-color: #e74c3c;
    --layout-animation-color: #f39c12;
    --layout-localization-color: #2c3e50;
    --layout-crossbrowser-color: #2980b9;
    --layout-responsiveness-color: #00bfa6;
}

.layout-check-item {
    font-size: 20px;
    display: flex;
    align-items: center;
}

.layout-check-item .icon {
    margin-right: 1.5rem;
}

.check-list li {
    list-style: none;
    padding-left: 2em;
    margin-bottom: 1rem;
}

.check-list li::before {
    content: "✔";
    color: #33841d;
    font-weight: bold;
    display: inline-block;
    width: 1.2em;
    margin-left: -1.2em;
}

.check-block {
    border-left: 6px solid #363636;
    background: #ffffff;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    transition: box-shadow 0.2s ease;
}

.check-block:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

#rounded-border {
    border: 3px solid #4a4a4a;
    border-radius: 15px;
    margin-left: 0;
}

#errorButton {
    background-color: #ff6b6b;
    color: white;
    border: none;
    border-radius: 10px;
    padding: 10px 20px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

#errorButton:hover {
    background-color: #ff4b4b;
    transform: scale(1.05);
}

#errorButton:active {
    background-color: #ff2b2b;
    transform: scale(0.95);
}

.check-block:nth-of-type(1) .icon i { color: var(--layout-validity-color); }       /* Валидность кода */
.check-block:nth-of-type(2) .icon i { color: var(--layout-display-color); }        /* Отображение контента */
.check-block:nth-of-type(3) .icon i { color: var(--layout-design-color); }         /* Соответствие дизайну */
.check-block:nth-of-type(4) .icon i { color: var(--layout-navigation-color); }     /* Навигация */
.check-block:nth-of-type(5) .icon i { color: var(--layout-speed-color); }          /* Скорость загрузки */
.check-block:nth-of-type(6) .icon i { color: var(--layout-animation-color); }      /* Анимация */
.check-block:nth-of-type(7) .icon i { color: var(--layout-localization-color); }   /* Локализация */
.check-block:nth-of-type(8) .icon i { color: var(--layout-crossbrowser-color); }   /* Кроссбраузерность */
.check-block:nth-of-type(9) .icon i { color: var(--layout-responsiveness-color); } /* Адаптивность */

.task-card:nth-child(1) .task-card-icon {
    --task-card-icon-color: var(--layout-validity-color);
}

.task-card:nth-child(2) .task-card-icon {
    --task-card-icon-color: var(--layout-display-color);
}

.task-card:nth-child(3) .task-card-icon {
    --task-card-icon-color: var(--layout-navigation-color);
}

.task-card:nth-child(4) .task-card-icon {
    --task-card-icon-color: var(--layout-speed-color);
}

.task-card:nth-child(5) .task-card-icon {
    --task-card-icon-color: var(--layout-animation-color);
}

.task-card:nth-child(6) .task-card-icon {
    --task-card-icon-color: var(--layout-crossbrowser-color);
}

.check-block a {
    color: inherit;
    text-decoration: underline;
    text-underline-offset: 2px;
    transition: color 0.3s ease;
}

.check-block a:hover {
    color: #3c56cc;
}