/* ============================================
   平平的小破站 - 更新日志页面样式
   版本: 1.0
   依赖: main.css (CSS变量)
   ============================================ */

/* 页面主体 */
.changelog-main {
    flex: 1;
    padding: 90px 1rem 4rem;
    position: relative;
    overflow: hidden;
}

.changelog-main::before {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(ellipse 800px 600px at 50% 0%, rgba(99, 102, 241, 0.07) 0%, transparent 70%),
        radial-gradient(ellipse 600px 500px at 90% 100%, rgba(6, 182, 212, 0.05) 0%, transparent 70%);
}

.changelog-container {
    max-width: 960px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* ============================================
   页面头部 Hero
   ============================================ */
.changelog-hero {
    text-align: center;
    margin-bottom: 2.5rem;
    animation: clFadeInUp 0.6s ease-out;
}

.changelog-hero-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 1rem;
    border-radius: var(--radius-2xl);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.changelog-hero h1 {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
}

.changelog-hero h1 i {
    color: var(--primary);
}

.changelog-hero p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

/* 统计卡片 */
.changelog-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.changelog-stat-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 1.25rem;
    text-align: center;
    transition: all var(--transition-normal);
}

.changelog-stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.changelog-stat-card .stat-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin: 0 auto 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1rem;
}

.changelog-stat-card .stat-icon.feature { background: linear-gradient(135deg, #6366f1, #818cf8); }
.changelog-stat-card .stat-icon.optimize { background: linear-gradient(135deg, #06b6d4, #22d3ee); }
.changelog-stat-card .stat-icon.bugfix { background: linear-gradient(135deg, #ef4444, #f87171); }
.changelog-stat-card .stat-icon.maintain { background: linear-gradient(135deg, #f59e0b, #fbbf24); }

.changelog-stat-card .stat-number {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
}

.changelog-stat-card .stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.2rem;
}

/* ============================================
   筛选栏
   ============================================ */
.changelog-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1rem 1.25rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 80px;
    z-index: 50;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.changelog-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.cl-filter-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.9rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    touch-action: manipulation;
    white-space: nowrap;
}

.cl-filter-btn:hover {
    border-color: var(--primary-light);
    color: var(--primary);
}

.cl-filter-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.cl-filter-btn .filter-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 4px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.2);
    font-size: 0.7rem;
    font-weight: 700;
}

.cl-filter-btn:not(.active) .filter-count {
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

/* 搜索框 */
.cl-search-wrapper {
    position: relative;
    flex: 1;
    min-width: 200px;
    max-width: 280px;
}

.cl-search-wrapper i {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.85rem;
    pointer-events: none;
}

.cl-search {
    width: 100%;
    padding: 0.5rem 0.75rem 0.5rem 2.2rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-family: var(--font-sans);
    transition: all var(--transition-fast);
}

.cl-search:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

.cl-search::placeholder {
    color: var(--text-muted);
}

/* ============================================
   时间线
   ============================================ */
.changelog-timeline {
    position: relative;
    padding-left: 2rem;
}

.changelog-timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--accent), transparent);
    border-radius: var(--radius-full);
}

/* 版本块 */
.version-block {
    position: relative;
    margin-bottom: 2.5rem;
    animation: clFadeInUp 0.5s ease-out backwards;
}

.version-block:nth-child(1) { animation-delay: 0.1s; }
.version-block:nth-child(2) { animation-delay: 0.2s; }
.version-block:nth-child(3) { animation-delay: 0.3s; }

/* 时间线节点 */
.version-block::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 1.5rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 3px solid var(--primary);
    z-index: 2;
    transition: all var(--transition-normal);
    box-shadow: 0 0 0 4px var(--bg-secondary);
}

.version-block:hover::before {
    border-color: var(--accent);
    transform: scale(1.2);
}

/* 版本头部 */
.version-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.version-number {
    font-size: 1.5rem;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--primary);
    letter-spacing: -0.02em;
}

.version-date {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.version-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.2rem 0.7rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.version-badge.major {
    background: rgba(99, 102, 241, 0.12);
    color: var(--primary);
    border: 1px solid rgba(99, 102, 241, 0.25);
}

.version-badge.minor {
    background: rgba(6, 182, 212, 0.12);
    color: var(--accent);
    border: 1px solid rgba(6, 182, 212, 0.25);
}

.version-badge.patch {
    background: rgba(245, 158, 11, 0.12);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.25);
}

.version-summary {
    margin-left: auto;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================
   变更分类
   ============================================ */
.change-category {
    margin-bottom: 1.25rem;
}

.change-category:last-child {
    margin-bottom: 0;
}

.change-category-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.6rem;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}

.change-category-header .cat-icon {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    color: #fff;
    flex-shrink: 0;
}

.change-category[data-cat="feature"] .cat-icon { background: linear-gradient(135deg, #6366f1, #818cf8); }
.change-category[data-cat="optimize"] .cat-icon { background: linear-gradient(135deg, #06b6d4, #22d3ee); }
.change-category[data-cat="bugfix"] .cat-icon { background: linear-gradient(135deg, #ef4444, #f87171); }
.change-category[data-cat="maintain"] .cat-icon { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
.change-category[data-cat="convention"] .cat-icon { background: linear-gradient(135deg, #8b5cf6, #a78bfa); }
.change-category[data-cat="lesson"] .cat-icon { background: linear-gradient(135deg, #10b981, #34d399); }

.change-category .cat-count {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-left: 0.25rem;
}

/* 变更列表 */
.change-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.change-item {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    padding: 0.6rem 0.9rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.change-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
    transform: translateX(4px);
}

.change-item .change-marker {
    flex-shrink: 0;
    margin-top: 0.15rem;
    font-size: 0.8rem;
}

.change-category[data-cat="feature"] .change-marker { color: var(--primary); }
.change-category[data-cat="optimize"] .change-marker { color: var(--accent); }
.change-category[data-cat="bugfix"] .change-marker { color: #ef4444; }
.change-category[data-cat="maintain"] .change-marker { color: #f59e0b; }
.change-category[data-cat="convention"] .change-marker { color: #8b5cf6; }
.change-category[data-cat="lesson"] .change-marker { color: #10b981; }

.change-item .change-text {
    flex: 1;
    min-width: 0;
}

.change-item .change-text strong {
    color: var(--primary);
    font-weight: 600;
}

.change-item .change-tag {
    display: inline-flex;
    align-items: center;
    padding: 0.1rem 0.5rem;
    margin-left: 0.4rem;
    border-radius: var(--radius-sm);
    font-size: 0.72rem;
    font-weight: 600;
    white-space: nowrap;
}

.change-tag.file-count {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

/* 隐藏状态 */
.change-item.hidden,
.change-category.hidden,
.version-block.hidden {
    display: none;
}

/* 无结果提示 */
.cl-no-results {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.cl-no-results i {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    display: block;
}

.cl-no-results p {
    font-size: 0.95rem;
}

/* ============================================
   返回顶部 & 下载按钮
   ============================================ */
.cl-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 3rem;
}

.cl-action-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    touch-action: manipulation;
    border: none;
}

.cl-action-btn.primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    box-shadow: var(--shadow-md);
}

.cl-action-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.cl-action-btn.secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.cl-action-btn.secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* ============================================
   动画
   ============================================ */
@keyframes clFadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.version-block.is-visible {
    animation: clFadeInUp 0.5s ease-out forwards;
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 768px) {
    .changelog-main {
        padding: 80px 0.75rem 3rem;
    }

    .changelog-hero h1 {
        font-size: 1.75rem;
    }

    .changelog-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .changelog-toolbar {
        position: static;
        flex-direction: column;
        align-items: stretch;
    }

    .cl-search-wrapper {
        max-width: 100%;
    }

    .changelog-filters {
        justify-content: center;
    }

    .changelog-timeline {
        padding-left: 1.5rem;
    }

    .version-block::before {
        left: -1.5rem;
        width: 12px;
        height: 12px;
    }

    .version-number {
        font-size: 1.25rem;
    }

    .version-summary {
        margin-left: 0;
        width: 100%;
    }

    .change-item {
        font-size: 0.85rem;
        padding: 0.5rem 0.75rem;
    }
}

@media (max-width: 480px) {
    .changelog-stats {
        grid-template-columns: 1fr;
    }

    .version-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.4rem;
    }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    .changelog-hero,
    .version-block,
    .version-block.is-visible {
        animation: none !important;
    }

    .change-item:hover {
        transform: none;
    }

    .changelog-stat-card:hover {
        transform: none;
    }
}