/**
 * Changelog page – Diabetes-style: SemVer, filters, collapsible version cards
 * Matches classroom theme (gradient background, light card surfaces)
 */

.changelog-page {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding-top: 60px;
}

.changelog-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.changelog-header {
    text-align: center;
    color: #fff;
    margin-bottom: 1.5rem;
}

.changelog-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.changelog-header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.changelog-count {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
    margin: 0 0 1.5rem 0;
}

.changelog-empty {
    text-align: center;
    color: #fff;
    padding: 3rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 12px;
}

/* SemVer section */
.changelog-semver {
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
}

.changelog-semver-heading {
    font-size: 1.1rem;
    font-weight: 600;
    color: #fff;
    margin: 0 0 0.5rem 0;
}

.changelog-semver-intro {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.95rem;
    margin: 0 0 1rem 0;
    line-height: 1.5;
}

.changelog-semver-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.changelog-semver-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border-left: 4px solid;
}

.changelog-semver-type-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.changelog-semver-type-icon i {
    color: #fff;
}

.changelog-semver-item-major .changelog-semver-type-icon { background: #ef4444; }
.changelog-semver-item-minor .changelog-semver-type-icon { background: #f97316; }
.changelog-semver-item-patch .changelog-semver-type-icon { background: #22c55e; }

.changelog-semver-item-content { min-width: 0; }
.changelog-semver-item strong { font-size: 0.95rem; color: #fff; }
.changelog-semver-item .semver-desc {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9rem;
    margin: 0.25rem 0 0 0;
}
.changelog-semver-item .semver-example {
    font-size: 0.85rem;
    font-family: ui-monospace, monospace;
    margin-top: 0.35rem;
    opacity: 0.9;
}

.changelog-semver-item-major {
    background: rgba(239, 68, 68, 0.15);
    border-left-color: #ef4444;
}
.changelog-semver-item-major strong { color: #fca5a5; }
.changelog-semver-item-minor {
    background: rgba(249, 115, 22, 0.15);
    border-left-color: #f97316;
}
.changelog-semver-item-minor strong { color: #fdba74; }
.changelog-semver-item-patch {
    background: rgba(34, 197, 94, 0.15);
    border-left-color: #22c55e;
}
.changelog-semver-item-patch strong { color: #86efac; }

/* Filters */
.changelog-filters-wrapper {
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.changelog-filters-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: flex-end;
}

.changelog-filter-group { min-width: 0; }
.changelog-filter-group.search { flex: 1; min-width: 200px; }
.changelog-filter-group.type { min-width: 160px; }
.changelog-filter-group.year { min-width: 110px; }
.changelog-filter-group.perpage { min-width: 130px; }

.changelog-filter-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 0.35rem;
}

.changelog-filter-group label i { margin-right: 0.35rem; }

#search-filter,
#type-filter,
#year-filter,
#per-page-filter {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    color: #1f2937;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 8px;
}

#search-filter::placeholder { color: #6b7280; }

#search-filter:focus,
#type-filter:focus,
#year-filter:focus,
#per-page-filter:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.3);
}

#clear-filters {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    color: #fff;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 8px;
    cursor: pointer;
}

#clear-filters:hover {
    background: rgba(255, 255, 255, 0.3);
}

.changelog-results-count {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.9);
}

/* Version cards */
.changelog-space {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.version-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    overflow: hidden;
    transition: box-shadow 0.2s ease;
}

.version-card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.version-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    cursor: pointer;
}

.version-header-left { display: flex; align-items: center; gap: 1rem; }
.version-header-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.version-title {
    margin: 0;
    font-size: 1.15rem;
    font-weight: 700;
    color: #fff;
}

.version-date {
    margin: 0.25rem 0 0 0;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.85);
}

.version-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.version-badge.major { background: #ef4444; color: #fff; }
.version-badge.minor { background: #f97316; color: #fff; }
.version-badge.patch { background: #22c55e; color: #0f1419; }

.version-toggle {
    color: rgba(255, 255, 255, 0.85);
    transition: transform 0.2s ease;
}

.version-card.open .version-toggle {
    transform: rotate(180deg);
}

.version-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}

.version-content.open {
    max-height: 6000px;
    overflow: visible;
}

.version-body {
    padding: 0 1.25rem 1.25rem;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.version-body-inner { padding-top: 1rem; }

.version-body-title {
    margin: 0 0 0.75rem 0;
    font-size: 1rem;
    color: #fff;
}

.changelog-description {
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1rem;
}

.changelog-features {
    list-style: none;
    padding: 0;
    margin: 0;
}

.changelog-features li {
    padding: 0.4rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: rgba(255, 255, 255, 0.9);
}

.changelog-features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

.copy-link-btn {
    padding: 0.35rem 0.6rem;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.9);
    background: transparent;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: color 0.2s ease, background 0.2s ease;
}

.copy-link-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.15);
}

.copy-link-btn i.fa-check { color: #22c55e; }
.copy-link-btn i.fa-times { color: #ef4444; }

@media (max-width: 768px) {
    .changelog-header h1 { font-size: 2rem; }
    .version-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .version-header-right {
        width: 100%;
        justify-content: flex-start;
    }
}