/* ========================================
 * Archive Timeline — 归档时间轴页面
 * 配对页面: pages/archive.php
 *
 * 设计：左侧竖线时间轴，所有元素在竖线右侧展开，
 * 年份/月份标记在线上，月份分组可折叠。
 * ======================================== */

/* ========================================
 * 1. PAGE CONTAINER
 * ======================================== */

/* Banner 只保留标题，隐藏信息行 */
#page-banner .banner-meta-row {
  display: none;
}

.archive-page {
  padding-bottom: var(--space-12);
}

/* 页面介绍文字 */
.archive-intro {
  margin-bottom: var(--space-8);
  padding: var(--space-5) var(--space-6);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-secondary);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
}

.archive-intro > :last-child {
  margin-bottom: 0;
}

/* 底部统计条 */
.archive-stats {
  margin-top: var(--space-8);
  padding: var(--space-4) var(--space-6);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  text-align: center;
}

/* ========================================
 * 1.5 TIMELINE CARD WRAPPER
 * ======================================== */
.timeline-card {
  position: relative;
  padding: var(--space-6) var(--space-8);
  background: var(--color-card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

/* 竖线需计入卡片 padding 偏移 */
.timeline-card .timeline::before {
  left: calc(12px);
}

.timeline-card .timeline-year-head::before {
  left: calc(2px);
}

.timeline-card .timeline-month-head::before {
  left: calc(5px);
}

.timeline-card .timeline-entry::before {
  left: calc(7px);
}

.timeline-card .timeline-entry::after {
  left: calc(12px);
}

/* ========================================
 * 2. QUICK NAV — 年份快速跳转
 * ======================================== */
.timeline-nav {
  position: sticky;
  top: calc(var(--header-height) + var(--space-2));
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-10);
  padding: var(--space-3) var(--space-4);
  background: var(--color-card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.timeline-nav::-webkit-scrollbar {
  display: none;
}

.tl-nav-year {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition-fast) var(--ease-in-out),
              border-color var(--transition-fast) var(--ease-in-out),
              color var(--transition-fast) var(--ease-in-out),
              box-shadow var(--transition-fast) var(--ease-in-out);
}

.tl-nav-year:hover,
.tl-nav-year.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.tl-nav-count {
  opacity: 0.7;
  font-size: var(--text-xs);
  font-weight: var(--font-normal);
}

.tl-nav-year:hover .tl-nav-count,
.tl-nav-year.active .tl-nav-count {
  opacity: 0.9;
}

/* ========================================
 * 3. TIMELINE CONTAINER & LEFT LINE
 * ======================================== */
.timeline {
  position: relative;
  padding: var(--space-4) 0;
}

/* 左侧竖线 */
.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    color-mix(in srgb, var(--color-primary) 35%, transparent) 3%,
    color-mix(in srgb, var(--color-primary) 35%, transparent) 97%,
    transparent 100%
  );
}

/* ========================================
 * 4. YEAR SECTION
 * ======================================== */
.timeline-year {
  position: relative;
  margin-bottom: var(--space-10);
}

.timeline-year:last-child {
  margin-bottom: 0;
}

/* --- Year Header --- */
.timeline-year-head {
  position: relative;
  display: flex;
  align-items: center;
  margin-bottom: var(--space-6);
  padding: var(--space-3) 0 var(--space-3) 40px;
}

/* 年份大圆点 */
.timeline-year-head::before {
  content: '';
  position: absolute;
  left: 2px; /* 12px line center - 10px radius */
  top: 50%;
  width: 20px;
  height: 20px;
  background: var(--color-primary);
  border: 4px solid var(--color-bg);
  border-radius: 50%;
  transform: translateY(-50%);
  z-index: 2;
  box-shadow: 0 0 0 2px var(--color-primary);
}

.year-label {
  position: relative;
  z-index: 3;
  margin: 0;
  padding: var(--space-2) var(--space-6);
  background: var(--color-card-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
}

.year-count {
  margin-left: var(--space-2);
  color: var(--color-primary);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
}

/* ========================================
 * 5. MONTH GROUP (collapsible)
 * ======================================== */
.timeline-month {
  position: relative;
  margin-bottom: var(--space-4);
}

.timeline-month:last-child {
  margin-bottom: 0;
}

/* --- Month Header (toggle trigger) --- */
.timeline-month-head {
  position: relative;
  display: flex;
  align-items: center;
  margin-bottom: var(--space-3);
  padding: 0 0 0 40px;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* 月份圆点 */
.timeline-month-head::before {
  content: '';
  position: absolute;
  left: 5px; /* 12px line center - 7px radius */
  top: 50%;
  width: 14px;
  height: 14px;
  background: var(--color-primary-light);
  border: 3px solid var(--color-bg);
  border-radius: 50%;
  transform: translateY(-50%);
  z-index: 2;
  transition: background var(--transition-fast) var(--ease-in-out),
              transform var(--transition-fast) var(--ease-in-out);
}

.timeline-month-head:hover::before {
  background: var(--color-primary);
  transform: translateY(-50%) scale(1.2);
}

.month-label {
  position: relative;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  padding: var(--space-1) var(--space-4);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast) var(--ease-in-out),
              color var(--transition-fast) var(--ease-in-out);
}

.timeline-month-head:hover .month-label {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.month-count {
  color: var(--color-text-muted);
  font-weight: var(--font-normal);
  font-size: var(--text-xs);
}

.month-arrow {
  font-size: var(--text-xs);
  transition: transform var(--transition-base) var(--ease-in-out);
  color: var(--color-text-muted);
}

.timeline-month-head.open .month-arrow {
  transform: rotate(180deg);
}

/* --- Month Body (collapsible posts container) --- */
.timeline-month-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s var(--ease-in-out);
}

.timeline-month-body.open {
  max-height: none; /* overridden by JS */
}

/* ========================================
 * 6. ARTICLE ENTRY (single-side)
 * ======================================== */
.timeline-entry {
  position: relative;
  width: 100%;
  padding: var(--space-3) 0 var(--space-3) 40px;
}

/* 文章小圆点 */
.timeline-entry::before {
  content: '';
  position: absolute;
  left: 7px; /* 12px line center - 5px radius */
  top: 50%;
  width: 10px;
  height: 10px;
  background: var(--color-bg-secondary);
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  z-index: 2;
  transform: translateY(-50%);
  transition: background var(--transition-fast) var(--ease-in-out),
              border-color var(--transition-fast) var(--ease-in-out);
}

.timeline-entry:hover::before {
  background: var(--color-primary);
}

/* 连接短线（竖线 → 卡片） */
.timeline-entry::after {
  content: '';
  position: absolute;
  left: 12px;
  top: 50%;
  width: 28px;
  height: 1px;
  background: color-mix(in srgb, var(--color-primary) 35%, transparent);
  z-index: 1;
  transition: background var(--transition-fast) var(--ease-in-out);
}

.timeline-entry:hover::after {
  background: var(--color-primary);
}

/* ========================================
 * 7. ARTICLE CARD
 * ======================================== */
.tl-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  max-width: 90%;
  padding: var(--space-4) var(--space-5);
  background: var(--color-card-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base) var(--ease-in-out),
              border-color var(--transition-base) var(--ease-in-out),
              transform var(--transition-base) var(--ease-in-out);
}

.tl-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
  transform: translateX(4px);
}

/* --- Date Badge --- */
.tl-date {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: color-mix(in srgb, var(--color-primary) 12%, transparent);
  border-radius: var(--radius-md);
}

.tl-date-day {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  line-height: 1;
}

/* --- Content --- */
.tl-content {
  flex: 1;
  min-width: 0;
}

.tl-title {
  display: block;
  margin: 0 0 var(--space-1);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  line-height: var(--leading-tight);
  text-decoration: none;
  word-break: break-word;
  transition: color var(--transition-fast) var(--ease-in-out);
}

.tl-title:hover {
  color: var(--color-primary);
}

/* --- Meta Badges Row --- */
.tl-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
}

.tl-cat,
.tl-tag {
  display: inline-block;
  padding: 1px var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition-fast) var(--ease-in-out),
              color var(--transition-fast) var(--ease-in-out);
}

/* 分类徽章 */
.tl-cat {
  background: color-mix(in srgb, var(--color-primary) 15%, transparent);
  color: var(--color-primary);
}

.tl-cat:hover {
  background: var(--color-primary);
  color: #ffffff;
}

/* 标签徽章 */
.tl-tag {
  background: var(--color-bg-tertiary);
  color: var(--color-text-muted);
}

.tl-tag:hover {
  background: var(--color-text-muted);
  color: var(--color-bg);
}

/* ========================================
 * 8. MOBILE
 * ======================================== */
@media (max-width: 767px) {
  .timeline-card {
    padding: var(--space-4) var(--space-4);
  }

  /* 卡片内线条偏移需随 padding 减小 */
  .timeline-card .timeline::before {
    left: calc(12px + var(--space-4));
  }
  .timeline-card .timeline-year-head::before {
    left: calc(2px + var(--space-4));
  }
  .timeline-card .timeline-month-head::before {
    left: calc(5px + var(--space-4));
  }
  .timeline-card .timeline-entry::before {
    left: calc(7px + var(--space-4));
  }
  .timeline-card .timeline-entry::after {
    left: calc(12px + var(--space-4));
  }

  .timeline-nav {
    top: var(--header-height);
    margin-bottom: var(--space-6);
    padding: var(--space-2) var(--space-3);
    gap: var(--space-1);
  }

  .tl-nav-year {
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
  }

  .timeline-year-head {
    padding-left: 34px;
  }

  .year-label {
    font-size: var(--text-lg);
    padding: var(--space-1) var(--space-4);
  }

  .timeline-month-head {
    padding-left: 34px;
  }

  .month-label {
    font-size: var(--text-xs);
  }

  .timeline-entry {
    padding: var(--space-2) 0 var(--space-2) 34px;
  }

  .tl-card {
    padding: var(--space-3) var(--space-4);
    gap: var(--space-3);
  }

  .tl-card:hover {
    transform: none;
  }

  .tl-date {
    width: 36px;
    height: 36px;
  }

  .tl-date-day {
    font-size: var(--text-base);
  }

  .tl-title {
    font-size: var(--text-sm);
  }

  .timeline-month {
    margin-bottom: var(--space-2);
  }

  .timeline-year {
    margin-bottom: var(--space-6);
  }
}

/* ========================================
 * 9. REDUCED MOTION
 * ======================================== */
@media (prefers-reduced-motion: reduce) {
  .timeline-month-body {
    transition: none;
  }

  .timeline-entry::before,
  .timeline-entry::after,
  .tl-card {
    transition: none;
  }
}

/* ========================================
 * 10. PRINT
 * ======================================== */
@media print {
  .timeline-nav {
    display: none;
  }

  .timeline::before {
    display: none;
  }

  .timeline-entry::before,
  .timeline-entry::after {
    display: none;
  }

  .timeline-entry {
    padding: var(--space-2) 0;
  }

  .tl-card {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}