/* ============================================
   SECTION: HEADER
   ============================================ */

.page-header {
    padding: var(--spacing-xl) 0;
    border-bottom: 3px solid #3498db;
}

.page-header__title {
    color: #2c3e50;
    font-family: var(--font-family-heading);
    font-size: var(--font-size-h2);
    line-height: var(--line-height-heading);
    margin-bottom: var(--spacing-md);
}

.page-header__description {
    color: var(--color-text);
    font-size: 1.1rem;
    max-width: 800px;
}

.page-header__description a {
    color: var(--color-primary);
    text-decoration: underline;
}

.page-header__description a:hover {
    color: var(--color-primary-light);
}

/* ============================================
   SECTION: SUMMARY BOX
   ============================================ */

.summary-box {
    background-color: #ecf0f1;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin: var(--spacing-lg) 0;
}

.summary-box__title {
    font-family: var(--font-family-heading);
    font-size: var(--font-size-h2);
    color: #34495e;
    margin-bottom: var(--spacing-md);
    border-bottom: 2px solid #95a5a6;
    padding-bottom: var(--spacing-sm);
}

.summary-box__list {
    list-style: none;
    padding: 0;
}

.summary-box__item {
    padding: var(--spacing-sm) 0;
    font-size: 1.1em;
}

.summary-box__item a {
    color: #2980b9;
    text-decoration: none;
    font-weight: 500;
}

.summary-box__item a:hover {
    text-decoration: underline;
}

/* ============================================
   SECTION: TABLE OF CONTENTS
   ============================================ */

.toc {
    background-color: #e8f4f8;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin: var(--spacing-lg) 0;
}

.toc__title {
    font-family: var(--font-family-heading);
    font-size: var(--font-size-h2);
    color: #34495e;
    margin-bottom: var(--spacing-md);
    border-bottom: 2px solid #95a5a6;
    padding-bottom: var(--spacing-sm);
}

.toc__list {
    list-style: none;
    padding-left: var(--spacing-lg);
}

.toc__link {
    color: #2980b9;
    text-decoration: none;
    font-weight: 500;
}

.toc__link:hover {
    text-decoration: underline;
}

/* ============================================
   SECTION: CONTENT SECTIONS
   ============================================ */

.content-section {
    margin-top: var(--spacing-xxl);
}

.content-section__title {
    color: #34495e;
    font-family: var(--font-family-heading);
    font-size: var(--font-size-h2);
    line-height: var(--line-height-heading);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid #95a5a6;
    padding-bottom: var(--spacing-sm);
}

/* ============================================
   SECTION: UPDATE ENTRIES
   ============================================ */

.update-entry {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: #fafafa;
}

.update-entry__title {
    font-size: 1.4em;
    color: #16a085;
    font-family: var(--font-family-heading);
    margin-top: 0;
    margin-bottom: var(--spacing-md);
}

.update-entry__title a {
    color: #16a085;
    text-decoration: none;
}

.update-entry__title a:hover {
    text-decoration: underline;
}

.update-entry__content {
    margin-top: var(--spacing-md);
}

/* ============================================
   SECTION: VALUE COMPARISON
   ============================================ */

.value-comparison {
    margin: var(--spacing-md) 0;
}

.value-comparison__old,
.value-comparison__new {
    margin: var(--spacing-sm) 0;
    line-height: 1.8;
}

.value-comparison__label {
    font-weight: bold;
}

.value-comparison__highlight {
    text-decoration: underline;
}

.value-comparison__lineage {
    font-size: 0.95em;
    line-height: 1.8;
    padding: var(--spacing-xs) 0;
}

/* ============================================
   SECTION: NAVIGATION
   ============================================ */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: #3498db;
    color: white;
    padding: 12px 20px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: bold;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    transition: background-color var(--transition-base);
    z-index: 50;
}

.back-to-top:hover {
    background-color: #2980b9;
    color: white;
}

/* ============================================
   SECTION: UTILITIES
   ============================================ */

.divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--spacing-lg) 0;
}