:root {
    --ppe-primary: #0d6efd;
    --ppe-primary-dark: #0a58ca;
    --ppe-primary-light: #e7f1ff;
    --ppe-accent: #198754;
    --ppe-warning: #ffc107;
    --ppe-text-dark: #212529;
    --ppe-text-medium: #495057;
    --ppe-text-light: #6c757d;
    --ppe-bg-light: #f8f9fa;
}

.ppe-doc-body {
    background-color: var(--ppe-bg-light);
}

/* --- HERO --- */
.ppe-hero {
    background: linear-gradient(135deg, rgba(0, 50, 90, 0.9), rgba(13, 110, 253, 0.8)), url('https://images.unsplash.com/photo-1581092580433-c2c1f0416952?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1770&q=80') center/cover no-repeat;
    padding: 5rem 1rem;
    color: white;
    text-align: center;
}

.ppe-hero__title {
    font-size: 2.8rem;
    font-weight: 700;
}

.ppe-hero__subtitle {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0.5rem auto 0;
    opacity: 0.95;
}

/* --- LAYOUT --- */
.ppe-layout {
    padding: 3rem 0;
}

.ppe-sidebar {
    position: sticky;
    top: 100px;
    height: calc(100vh - 120px);
    overflow-y: auto;
}

.ppe-toc {
    background-color: var(--qc-color-bg-white);
    border-radius: var(--qc-radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--qc-color-border);
}

.ppe-toc__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--ppe-text-dark);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.ppe-toc__title .material-icons {
    color: var(--ppe-primary);
}

.ppe-toc__list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ppe-toc__link {
    display: block;
    padding: 0.6rem 0.5rem;
    color: var(--ppe-text-medium);
    text-decoration: none;
    border-left: 3px solid transparent;
    font-weight: 500;
    transition: all 0.2s ease;
}

.ppe-toc__link:hover {
    background-color: var(--ppe-primary-light);
    color: var(--ppe-primary);
}

.ppe-toc__link.active {
    color: var(--ppe-primary);
    font-weight: 700;
    border-left-color: var(--ppe-primary);
    background-color: var(--ppe-primary-light);
}

/* --- CONTENT SECTION --- */
.ppe-section {
    background-color: var(--qc-color-bg-white);
    border-radius: var(--qc-radius-lg);
    padding: 2.5rem;
    margin-bottom: 2.5rem;
    box-shadow: var(--qc-shadow-sm);
    border: 1px solid var(--qc-color-border);
    scroll-margin-top: 100px;
}

.ppe-section__title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--ppe-primary-dark);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--qc-color-border);
}

.ppe-section__title .material-icons {
    font-size: 2.25rem;
}

/* --- SPECIFIC COMPONENT STYLES --- */
.ppe-hierarchy-of-controls {
    list-style: none;
    padding: 0;
    counter-reset: hierarchy-counter 6;
}

.ppe-hierarchy-of-controls li {
    counter-increment: hierarchy-counter -1;
    margin-bottom: 1rem;
    padding: 1rem 1.5rem 1rem 4rem;
    border-radius: var(--qc-radius-md);
    position: relative;
    background-color: var(--qc-color-bg-light);
    border: 1px solid var(--qc-color-border);
}

.ppe-hierarchy-of-controls li::before {
    content: counter(hierarchy-counter);
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background-color: var(--ppe-primary);
    color: white;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ppe-hierarchy-of-controls li.is-ppe {
    background-color: var(--ppe-primary-light);
    border-color: var(--ppe-primary);
}

.ppe-hierarchy-of-controls li.is-ppe::before {
    background-color: var(--ppe-accent);
}

.ppe-hierarchy-of-controls li strong {
    color: var(--ppe-text-dark);
}

.ppe-category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.ppe-category-card {
    background-color: var(--qc-color-bg-light);
    border: 1px solid var(--qc-color-border);
    border-radius: var(--qc-radius-md);
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.ppe-category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--qc-shadow-md);
}

.ppe-category-card__icon {
    font-size: 3rem;
    color: var(--ppe-primary);
    margin-bottom: 1rem;
}

.ppe-category-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--ppe-text-dark);
    margin-bottom: 0.75rem;
}

.ppe-category-card__description {
    font-size: 0.95rem;
    color: var(--ppe-text-medium);
    line-height: 1.5;
}

.ppe-mistake-list__item {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    border-bottom: 1px solid var(--qc-color-border);
}

.ppe-mistake-list__item:last-child {
    border-bottom: none;
}

.ppe-mistake-list__icon {
    font-size: 2.5rem;
    color: var(--qc-color-danger);
    flex-shrink: 0;
}

.ppe-mistake-list__details strong {
    display: block;
    font-size: 1.1rem;
    color: var(--ppe-text-dark);
    margin-bottom: 0.5rem;
}

.ppe-mistake-list__details p {
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.ppe-mistake-list__fix {
    font-weight: 500;
    color: var(--ppe-accent);
}

.ppe-step-card {
    background-color: var(--qc-color-bg-light);
    border: 1px solid var(--qc-color-border);
    border-radius: var(--qc-radius-md);
    padding: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-left: 5rem;
}

.ppe-step-card::before {
    content: attr(data-step);
    position: absolute;
    left: 1.5rem;
    top: 2rem;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background-color: var(--ppe-primary);
    color: white;
    font-weight: 700;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ppe-step-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--ppe-text-dark);
    margin-bottom: 1rem;
}

.ppe-step-card p {
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.ppe-step-card ul {
    margin-top: 0.75rem;
    padding-left: 1.5rem;
}

.ppe-step-card ul li {
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.ppe-cta-box {
    background: var(--ppe-primary);
    color: white;
    border-radius: var(--qc-radius-lg);
    padding: 2.5rem;
    text-align: center;
}

.ppe-cta-box__title {
    color: white;
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.ppe-cta-box__btn {
    font-weight: 600;
    padding: 0.8rem 2rem;
    background-color: white;
    color: var(--ppe-primary);
}

.ppe-cta-box__btn:hover {
    background-color: var(--ppe-bg-light);
}

.ppe-info-box {
    background-color: #e7f5ff;
    border-left: 4px solid var(--ppe-primary);
    padding: 1.25rem;
    margin: 1.5rem 0;
    border-radius: var(--qc-radius-sm);
}

.ppe-info-box__title {
    font-weight: 600;
    color: var(--ppe-primary-dark);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

@media(max-width: 991.98px) {
    .ppe-sidebar {
        display: none;
    }

    .ppe-step-card {
        padding-left: 2rem;
    }

    .ppe-step-card::before {
        left: -1.5rem;
        top: 1rem;
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }
}