/**
 * 文件说明：更新日志页独立样式
 * 命名前缀：ul-*（update log）
 * 设计令牌复用 home.css :root，带 fallback
 * 风格：克制、专业、左侧时间轴主线 + 右侧日期分组内容
 */

/* ========== 主容器 ========== */
.ul-container {
    min-height: calc(100vh - 60px);
    padding-top: 60px;
    background: #fff;
}

/* ========== Hero ========== */
.ul-hero {
    max-width: 760px;
    margin: 0 auto;
    padding: 64px 20px 40px;
    text-align: center;
}

.ul-hero h1 {
    margin: 0 0 16px;
    font-size: 44px;
    font-weight: 700;
    color: var(--ig50-text, #1f2937);
    letter-spacing: 0.5px;
}

.ul-hero h2 {
    margin: 0 0 14px;
    font-size: 20px;
    font-weight: 400;
    color: var(--ig50-text-secondary, #6b7280);
}

.ul-hero p {
    margin: 0;
    font-size: 15px;
    color: var(--ig50-text-light, #9ca3af);
}

/* ========== 时间轴主体 ========== */
.ul-timeline-section {
    padding: 0 20px 96px;
}

.ul-timeline {
    position: relative;
    max-width: 760px;
    margin: 0 auto;
    padding-left: 48px;
}

/* 左侧主线：蓝紫渐变浅色 */
.ul-timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background: linear-gradient(180deg, rgba(30, 159, 255, 0.5) 0%, rgba(124, 92, 255, 0.3) 100%);
    border-radius: 1px;
}

/* ========== 日期分组 ========== */
.ul-version {
    position: relative;
    padding-bottom: 40px;
}

.ul-version:last-child {
    padding-bottom: 0;
}

/* 节点圆点：蓝紫渐变 + 光晕 */
.ul-node {
    position: absolute;
    left: -34px;
    top: 4px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: linear-gradient(135deg, #1e9fff 0%, #7c5cff 100%);
    box-shadow: 0 0 0 4px rgba(30, 159, 255, 0.12);
}

/* 日期标题 */
.ul-date {
    margin-bottom: 14px;
    font-size: 17px;
    font-weight: 700;
    color: var(--ig50-text, #1f2937);
}

/* 内容区 */
.ul-content {
    color: var(--ig50-text, #1f2937);
}

/* 分类段落小标题 */
.ul-label {
    margin: 12px 0 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--ig50-text-secondary, #6b7280);
}

.ul-label:first-child {
    margin-top: 0;
}

/* 段落正文 */
.ul-content > p {
    margin: 8px 0;
    font-size: 14px;
    line-height: 1.7;
    color: var(--ig50-text, #1f2937);
}

/* 字段列表 */
.ul-list {
    margin: 6px 0 0;
    padding: 0;
    list-style: none;
}

.ul-list li {
    position: relative;
    padding: 3px 0 3px 16px;
    font-size: 14px;
    line-height: 1.6;
    color: var(--ig50-text, #1f2937);
}

/* 列表前缀小圆点 */
.ul-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--ig50-blue, #1e9fff);
    opacity: 0.5;
}

/* ========== 移动端适配 (767.98px) ========== */
@media (max-width: 767.98px) {
    .ul-hero {
        padding: 48px 20px 32px;
    }

    .ul-hero h1 {
        font-size: 32px;
    }

    .ul-hero h2 {
        font-size: 17px;
    }

    .ul-hero p {
        font-size: 14px;
    }

    .ul-timeline-section {
        padding: 0 20px 64px;
    }

    .ul-timeline {
        padding-left: 36px;
    }

    .ul-timeline::before {
        left: 14px;
    }

    .ul-node {
        left: -30px;
        width: 12px;
        height: 12px;
        box-shadow: 0 0 0 3px rgba(30, 159, 255, 0.12);
    }

    .ul-version {
        padding-bottom: 32px;
    }

    .ul-date {
        font-size: 16px;
    }

    .ul-label,
    .ul-list li,
    .ul-content > p {
        font-size: 13.5px;
    }
}