/* =============================================================================
   Chino's Blog — Pages: hero, post grid/card, save, cat, tag, post page,
   archive, 404, utilities, motion / a11y / print
 ============================================================================ */

/* ─────────────────────────────────────────────────────────────────────────────
   8.  PAGES
   ───────────────────────────────────────────────────────────────────────────── */

/* ── Hero ─────────────────────────────────────────────────── */
.hero { position: relative; margin-block: var(--space-4) var(--space-6); }
.hero-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-4); min-height: 22rem; }
@media (min-width: 768px) { .hero-grid { grid-template-columns: 1.1fr .9fr; gap: var(--space-6); } }

.hero-card {
  position: relative; display: flex; flex-direction: column; gap: var(--space-4); padding: 1.5rem;
  background: linear-gradient(135deg, hsla(var(--chino), .08) 0%, hsla(var(--ren), .08) 50%, hsla(var(--accent), .06) 100%), var(--color-surface);
  border: 1px solid var(--color-divider-soft); border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-md); overflow: hidden;
}
.hero-card::before, .hero-card::after {
  content: ''; position: absolute; border-radius: 50%; filter: blur(40px); pointer-events: none; opacity: .5; z-index: 0;
}
.hero-card::before { width: 12rem; height: 12rem; background: hsla(var(--chino), .22); top: -3rem; right: -3rem; }
.hero-card::after  { width: 10rem; height: 10rem; background: hsla(var(--accent), .2); bottom: -3rem; left: -2rem; }
.hero-card > * { position: relative; z-index: 1; }
@media (min-width: 768px) { .hero-card { padding: 2rem; gap: 1.25rem; } }

.hero-badge {
  display: inline-flex; align-items: center; gap: .375rem; align-self: flex-start;
  padding: .3125rem .75rem; border-radius: var(--radius-full);
  background: hsla(var(--chino), .14); color: var(--color-chino); font-size: var(--fz-xs); font-weight: 600;
  border: 1px solid hsla(var(--chino), .2);
}
.hero-badge svg { width: .875rem; height: .875rem; }

.hero-title {
  font-family: var(--font-display); font-size: clamp(1.875rem, 2.5vw + 1rem, var(--fz-5xl));
  font-weight: 800; line-height: 1.15; letter-spacing: -.035em; color: var(--color-foreground); margin: 0;
}
.hero-title .gradient {
  background: linear-gradient(135deg, hsl(var(--chino)) 0%, hsl(var(--ren)) 60%, hsl(var(--accent)) 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; color: transparent;
}
.hero-desc { font-size: var(--fz-base); line-height: 1.7; color: hsl(var(--default-600)); max-width: 36rem; }
html.chino-dark .hero-desc { color: hsl(var(--default-400)); }
.hero-buttons { display: inline-flex; flex-wrap: wrap; gap: var(--space-3); }

.hero-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-2); margin-top: auto; padding-top: var(--space-4); border-top: 1px dashed var(--color-divider); }
.hero-stat { display: flex; flex-direction: column; gap: .125rem; }
.hero-stat-value { font-family: var(--font-display); font-size: var(--fz-2xl); font-weight: 800; color: var(--color-foreground); letter-spacing: -.02em; }
.hero-stat-label { font-size: var(--fz-xs); color: var(--color-muted); }

.hero-figure {
  position: relative; display: flex; flex-direction: column; border-radius: var(--radius-2xl);
  overflow: hidden; border: 1px solid var(--color-divider-soft);
  background: linear-gradient(180deg, hsla(var(--chino), .05) 0%, hsla(var(--accent), .05) 100%);
  box-shadow: var(--shadow-lg); min-height: 22rem;
}
.hero-figure-img { flex: 1; display: flex; align-items: end; justify-content: center; padding: var(--space-4); }
.hero-figure-img img { max-height: 22rem; width: auto; filter: drop-shadow(0 8px 16px hsla(var(--chino), .25)); object-fit: contain; transition: transform var(--t-spring); }
.hero-figure:hover .hero-figure-img img { transform: translateY(-4px) scale(1.02); }
.hero-figure-meta {
  display: flex; align-items: center; gap: var(--space-3); padding: var(--space-4) var(--space-5);
  background: var(--color-surface); border-top: 1px solid var(--color-divider-soft);
}
.hero-figure-avatar { width: 2.5rem; height: 2.5rem; border-radius: var(--radius-md); object-fit: cover; flex-shrink: 0; }
.hero-figure-text { display: flex; flex-direction: column; gap: .125rem; min-width: 0; }
.hero-figure-name { font-weight: 700; font-size: var(--fz-base); color: var(--color-foreground); }
.hero-figure-from { font-size: var(--fz-xs); color: var(--color-muted); }

.hero-shortcuts { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); margin-top: var(--space-4); }
.hero-shortcut {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .5rem;
  padding: 1.25rem .75rem; border-radius: var(--radius-xl); background: var(--color-surface);
  border: 1px solid var(--color-divider-soft); color: var(--color-foreground); text-decoration: none;
  font-weight: 600; font-size: var(--fz-sm);
  transition: transform var(--t-slow), box-shadow var(--t-slow), border-color var(--t-base), color var(--t-fast);
}
.hero-shortcut svg { width: 1.5rem; height: 1.5rem; color: var(--color-chino); transition: transform var(--t-spring); }
.hero-shortcut:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: hsla(var(--chino), .3); color: var(--color-chino); }
.hero-shortcut:hover svg { transform: scale(1.1) rotate(-4deg); }

/* ── Section header ───────────────────────────────────────── */
.section { margin-block: var(--section-gap); }
.section-header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-5); flex-wrap: wrap; }
.section-title {
  display: inline-flex; align-items: center; gap: .5rem; font-family: var(--font-display);
  font-size: clamp(1.25rem, 1vw + 1rem, var(--fz-3xl)); font-weight: 700; letter-spacing: -.02em;
  color: var(--color-foreground); margin: 0;
}
.section-title .deco { width: .25rem; height: 1.5rem; background: linear-gradient(to bottom, hsl(var(--chino)), hsl(var(--accent))); border-radius: 1px; }
.section-title .count { color: var(--color-muted); font-weight: 500; font-size: .875em; }
.section-subtitle { color: var(--color-muted); font-size: var(--fz-sm); margin-top: .25rem; }

/* ── Post grid ───────────────────────────────────────────── */
.posts-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3); }
@media (min-width: 768px)  { .posts-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-5); } }
@media (min-width: 1024px) { .posts-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1280px) { .posts-grid { grid-template-columns: repeat(4, 1fr); } }

.post-card {
  position: relative; display: flex; flex-direction: column;
  background: var(--color-surface); border: 1px solid var(--color-divider-soft);
  border-radius: var(--radius-xl); overflow: hidden; text-decoration: none; color: inherit; cursor: pointer;
  transition: transform var(--t-slow), box-shadow var(--t-slow), border-color var(--t-base);
}
.post-card::after {
  content: ''; position: absolute; left: 0; right: 0; top: 0; height: 3px;
  background: linear-gradient(to right, var(--card-accent, #4672BC), var(--card-accent, #4672BC) 60%, transparent);
  opacity: 0; transition: opacity var(--t-base);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}
.post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--card-accent, #4672BC), transparent 65%); }
.post-card:hover::after { opacity: 1; }
.post-card-cover {
  position: relative; width: 100%; aspect-ratio: 16 / 9;
  background-image: var(--cover, linear-gradient(135deg, var(--card-accent, #4672BC) 0%, color-mix(in srgb, var(--card-accent, #4672BC), transparent 35%) 100%));
  background-size: cover; background-position: center;
  overflow: hidden; display: flex; align-items: end; justify-content: start; padding: var(--space-3);
}
.post-card-cover::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 80% 20%, hsla(0,0%,100%,.25), transparent 70%),
    radial-gradient(ellipse 60% 50% at 10% 90%, hsla(0,0%,0%,.2), transparent 70%);
  opacity: .6;
}
.post-card-cover-tag {
  position: relative; z-index: 1; display: inline-flex; align-items: center; gap: .25rem;
  padding: .25rem .5rem; border-radius: var(--radius-sm); background: hsla(0, 0%, 100%, .95);
  color: var(--card-accent, #4672BC); font-size: var(--fz-2xs); font-weight: 700;
  letter-spacing: .04em; text-transform: uppercase; box-shadow: var(--shadow-sm);
}
.post-card-cover-tag svg { width: .75rem; height: .75rem; }
.post-card-body { display: flex; flex-direction: column; gap: var(--space-2); padding: var(--space-4); flex: 1; }
.post-card-meta { display: flex; align-items: center; flex-wrap: wrap; gap: .25rem var(--space-3); font-size: var(--fz-2xs); color: var(--color-muted); }
.post-card-meta > span { display: inline-flex; align-items: center; gap: .25rem; }
.post-card-meta svg { width: .75rem; height: .75rem; }
.post-card-title {
  font-family: var(--font-display); font-size: var(--fz-base); font-weight: 700; line-height: 1.4;
  letter-spacing: -.01em; color: var(--color-foreground);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; transition: color var(--t-fast);
}
@media (min-width: 640px) { .post-card-title { font-size: var(--fz-md); } }
.post-card:hover .post-card-title { color: var(--card-accent, #4672BC); }
.post-card-summary { font-size: var(--fz-sm); line-height: 1.6; color: var(--color-muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.post-card-footer { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); margin-top: auto; padding-top: var(--space-3); border-top: 1px dashed var(--color-divider-soft); }
.post-card-tags { display: flex; flex-wrap: wrap; gap: .25rem; }
.post-card-tags .tag { height: 1.375rem; padding: 0 .4375rem; font-size: 10px; }
.post-card-cta { display: inline-flex; align-items: center; gap: .25rem; font-size: var(--fz-xs); color: var(--color-muted); font-weight: 500; }
.post-card-cta svg { width: .75rem; height: .75rem; transition: transform var(--t-fast); }
.post-card:hover .post-card-cta { color: var(--card-accent, #4672BC); }
.post-card:hover .post-card-cta svg { transform: translateX(2px); }

/* ── Save-slot cards (ChinoBlog signature — L-bracket corners) ───────── */
.save-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3); }
@media (min-width: 640px)  { .save-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .save-grid { grid-template-columns: repeat(4, 1fr); gap: var(--space-4); } }

.save-card {
  --save-accent: #4672BC;
  position: relative; display: block; aspect-ratio: 3 / 4;
  border-radius: var(--radius-sm); overflow: hidden; border: 2px solid hsl(var(--default-200));
  box-shadow: var(--shadow-md); cursor: pointer; text-decoration: none; color: #fff;
  transition: transform var(--t-slow), box-shadow var(--t-slow), border-color var(--t-slow);
}
html.chino-dark .save-card { border-color: hsl(var(--default-600)); }

.save-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-xl); border-color: var(--save-accent, #4672BC); }

.save-cover {
  position: absolute; inset: 0;
  background-image: var(--cover,
    radial-gradient(ellipse 60% 50% at 20% 20%, hsla(var(--save-accent), 1) 0%, transparent 60%),
    linear-gradient(135deg, var(--save-accent, #4672BC) 0%, hsla(var(--default-700), .8) 100%)
  );
  background-size: cover; background-position: center;
  transition: transform .5s var(--t-slow);
}
.save-card:hover .save-cover { transform: scale(1.06); }
.save-overlay { position: absolute; inset: 0; background: linear-gradient(to top, hsla(0,0%,0%,.85) 0%, hsla(0,0%,0%,.35) 45%, transparent 80%); }
.save-pattern {
  position: absolute; inset: 0;
  background-image:
    repeating-linear-gradient(135deg, hsla(0,0%,100%,.04) 0 1px, transparent 1px 12px),
    repeating-linear-gradient(45deg,  hsla(0,0%,100%,.04) 0 1px, transparent 1px 12px);
  pointer-events: none;
}
/* 四角 L 形角标：上 = chino 蓝，下 = ren 薰衣草 */
.save-card::before, .save-card::after {
  content: ''; position: absolute; width: 16px; height: 16px; z-index: 3;
  transition: width var(--t-base), height var(--t-base); pointer-events: none;
}
.save-card::before { top: 6px; left: 6px; border-top: 2px solid hsl(var(--chino)); border-left: 2px solid hsl(var(--chino)); }
.save-card::after  { top: 6px; right: 6px; border-top: 2px solid hsl(var(--chino)); border-right: 2px solid hsl(var(--chino)); }
.save-card .corner-bl, .save-card .corner-br {
  position: absolute; width: 16px; height: 16px; z-index: 3;
  transition: width var(--t-base), height var(--t-base); pointer-events: none;
}
.save-card .corner-bl { bottom: 6px; left: 6px; border-bottom: 2px solid hsl(var(--ren)); border-left: 2px solid hsl(var(--ren)); }
.save-card .corner-br { bottom: 6px; right: 6px; border-bottom: 2px solid hsl(var(--ren)); border-right: 2px solid hsl(var(--ren)); }
.save-card:hover::before, .save-card:hover::after,
.save-card:hover .corner-bl, .save-card:hover .corner-br { width: 20px; height: 20px; }

.save-top { position: absolute; top: 0; left: 0; right: 0; display: flex; align-items: center; justify-content: space-between; padding: 10px; z-index: 4; }
.save-number { background: hsla(var(--save-accent), .92); padding: 3px 8px; font-family: var(--font-mono); font-size: 10px; font-weight: 700; color: #fff; letter-spacing: .08em; border-radius: 2px; }
.save-code { background: hsla(0, 0%, 0%, .65); padding: 3px 6px; font-family: var(--font-mono); font-size: 9px; font-weight: 700; color: #fff; letter-spacing: .04em; border: 1px solid hsla(0, 0%, 100%, .2); border-radius: 2px; }
.save-bottom { position: absolute; bottom: 0; left: 0; right: 0; padding: .625rem .75rem; z-index: 4; display: flex; flex-direction: column; gap: .375rem; }
.save-title { font-family: var(--font-display); font-size: var(--fz-sm); font-weight: 700; line-height: 1.3; color: #fff; text-shadow: 0 1px 4px hsla(0,0%,0%,.6); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; letter-spacing: -.01em; }
.save-meta { display: flex; align-items: center; justify-content: space-between; gap: .5rem; }
.save-cat { background: hsla(var(--save-accent), .92); padding: 2px 8px; font-size: 10px; font-weight: 600; color: #fff; border-radius: 2px; }
.save-stats { display: inline-flex; align-items: center; gap: .375rem; font-family: var(--font-mono); font-size: 9px; color: hsla(0,0%,100%,.85); }
.save-stats span { display: inline-flex; align-items: center; gap: .125rem; }
.save-stats svg { width: .625rem; height: .625rem; }

/* ── Category list (flat card rows) ───────────────────────── */
.cat-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-3); }
@media (min-width: 640px) { .cat-grid { grid-template-columns: repeat(2, 1fr); } }

.cat-card {
  display: flex; align-items: center; gap: var(--space-4); padding: var(--space-4);
  border-radius: var(--radius-xl); background: var(--color-surface); border: 1px solid var(--color-divider-soft);
  color: var(--color-foreground); text-decoration: none; position: relative; overflow: hidden;
  transition: transform var(--t-base), box-shadow var(--t-base), border-color var(--t-base);
}
.cat-card::before {
  content: ''; position: absolute; top: 0; bottom: 0; left: 0; width: 4px;
  background: var(--cat-color, hsl(var(--chino))); transition: width var(--t-base);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.cat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: color-mix(in srgb, var(--cat-color, #4672BC), transparent 65%); }
.cat-card:hover::before { width: 8px; }
.cat-card-icon { display: inline-flex; align-items: center; justify-content: center; width: 2.75rem; height: 2.75rem; border-radius: var(--radius-lg); background: color-mix(in srgb, var(--cat-color, #4672BC), transparent 85%); color: var(--cat-color, #4672BC); flex-shrink: 0; }
.cat-card-icon svg { width: 1.25rem; height: 1.25rem; }
.cat-card-info { min-width: 0; flex: 1; }
.cat-card-name { font-family: var(--font-display); font-size: var(--fz-base); font-weight: 700; color: var(--color-foreground); }
.cat-card-desc { font-size: var(--fz-sm); color: var(--color-muted); }
.cat-card-count { font-family: var(--font-mono); font-size: var(--fz-xs); color: var(--color-muted); padding: .25rem .5rem; border-radius: var(--radius-sm); background: var(--color-surface-2); }

/* ── Tag cloud ───────────────────────────────────────────── */
.tag-cloud { display: flex; flex-wrap: wrap; gap: .5rem; }
.tag-cloud .tag { transition: transform var(--t-fast); }
.tag-cloud .tag:hover { transform: translateY(-2px); }

/* ── Filter toolbar ─────────────────────────────────────── */
.filter-bar { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); padding: var(--space-4); background: var(--color-surface); border: 1px solid var(--color-divider-soft); border-radius: var(--radius-xl); margin-bottom: var(--space-6); }
.filter-bar-label { font-size: var(--fz-sm); font-weight: 600; color: var(--color-muted); margin-right: var(--space-2); display: inline-flex; align-items: center; gap: .375rem; }
.filter-bar-label svg { width: 1rem; height: 1rem; }

/* ── Page header ─────────────────────────────────────────── */
/* 明确主次层级：eyebrow（badge）为最弱的小标签 → page-title 为绝对主角
   （大字号、重字重）→ description 为次要说明。杜绝「前小后大」的模糊感。 */
.page-header { margin-bottom: var(--space-8); }
/* badge 与 page-title 协调：不再用极小的 eyebrow，而是有分量、
   中等字号的主色 pill，避免「前小后大、头重脚轻」。 */
.page-header .badge {
  height: auto; padding: .375rem .75rem; margin-bottom: var(--space-3);
  font-size: var(--fz-sm); font-weight: 700;
  letter-spacing: .02em; text-transform: none;
  color: var(--color-chino); background: hsla(var(--chino), .12);
  border-color: hsla(var(--chino), .28);
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}
.page-header .badge:hover { color: var(--color-chino); border-color: hsla(var(--chino), .45); background: hsla(var(--chino), .18); }
.page-header .badge svg { width: 1rem; height: 1rem; }
/* 帖子页分类 pill：与正文标题协调，避免过小 */
.post-header .badge-chino { font-size: var(--fz-sm); height: auto; padding: .375rem .75rem; }
.page-title { display: inline-flex; align-items: center; gap: .75rem; font-family: var(--font-display); font-size: clamp(1.875rem, 2.4vw + 1rem, var(--fz-5xl)); font-weight: 800; letter-spacing: -.035em; line-height: 1.1; color: var(--color-foreground); margin: 0 0 var(--space-3); }
.page-title .deco { flex-shrink: 0; width: .3125rem; height: 2.25rem; background: linear-gradient(to bottom, hsl(var(--chino)), hsl(var(--accent))); border-radius: 2px; }
.page-title svg { width: 1.625rem; height: 1.625rem; color: var(--color-chino); }
.page-description { color: var(--color-muted); font-size: var(--fz-base); max-width: 42rem; line-height: 1.7; }

/* ── Post page ───────────────────────────────────────────── */
/* 桌面端：左侧 TOC + 居中正文（移除原右侧 rail-card 操作面板，
   让正文更聚焦；移动端单栏，TOC 收进 mobileDrawer。 */
.post-wrap { display: block; max-width: var(--reading-w); margin-inline: auto; }
.post-container { max-width: var(--reading-w); margin-inline: auto; width: 100%; }
/* 中等桌面（1024–1279）：左列 sticky 目录 + 居中正文，避免重叠 */
@media (min-width: 1024px) and (max-width: 1279px) {
  .post-wrap {
    max-width: calc(var(--reading-w) + 14rem + var(--space-8));
    display: grid; grid-template-columns: 14rem minmax(0, 1fr); gap: var(--space-8); align-items: start;
  }
  .post-container { max-width: var(--reading-w); margin-inline: 0 auto; }
}
/* 宽桌面（≥1280）：正文居中于视口，目录悬浮在视口左侧（fixed），不随正文居中 */
@media (min-width: 1280px) {
  .post-toc {
    position: fixed;
    top: calc(var(--nav-h) + var(--space-4));
    left: max(1rem, calc((100vw - var(--reading-w)) / 2 - 15rem));
    width: 14rem;
    max-height: calc(100vh - var(--nav-h) - var(--space-8));
  }
}

/* TOC sidebar (ChinoBlog style, solid) — 重优化：拉开行距、明确层级、
   避免标题拥挤；h3 进一步缩进并弱化。 */
.post-toc {
  position: sticky; top: calc(var(--nav-h) + var(--space-4)); max-height: calc(100vh - var(--nav-h) - var(--space-8));
  overflow-y: auto; padding: var(--space-5); background: var(--color-surface);
  border: 1px solid var(--color-divider-soft); border-radius: var(--radius-xl); box-shadow: var(--shadow-xs); display: none;
}
@media (min-width: 1024px) { .post-toc { display: block; } }
/* 移动端：JS 将本 TOC 移入右侧抽屉，置于顶部、自上而下排列，
   用与帖子卡片相同的直角实色边框划分 */
@media (max-width: 1023px) {
  /* 移动端目录：抽屉底部、纵向占满剩余空白，内部列表独立滚动 */
  .mobile-drawer .post-toc {
    display: flex; flex-direction: column; flex: 1 1 auto; min-height: 8rem;
    position: static; top: auto; max-height: none; overflow: hidden;
    margin: var(--space-4) 0 0; padding: var(--space-4);
    background: var(--color-surface); border: 1px solid var(--color-divider-soft);
    border-radius: var(--radius-xl); box-shadow: var(--shadow-xs);
  }
  .mobile-drawer .post-toc .toc-title { margin-bottom: var(--space-3); flex-shrink: 0; }
  .mobile-drawer .post-toc .toc-list { gap: .375rem; overflow-y: auto; min-height: 0; flex: 1 1 auto; }
}
.post-toc::-webkit-scrollbar { width: 4px; }
.post-toc::-webkit-scrollbar-thumb { background: hsla(var(--default-300), .6); }
.toc-title { display: flex; align-items: center; gap: .5rem; font-family: var(--font-display); font-size: var(--fz-sm); font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--color-muted); margin: 0 0 var(--space-3); padding-bottom: var(--space-3); border-bottom: 1px solid var(--color-divider-soft); }
.toc-title svg { width: 1rem; height: 1rem; color: var(--color-chino); }
.toc-list { display: flex; flex-direction: column; gap: .375rem; }
.toc-list a { position: relative; display: block; padding: .4375rem .625rem .4375rem 1rem; font-size: var(--fz-sm); line-height: 1.5; color: var(--color-muted); text-decoration: none; border-radius: var(--radius-sm); border-left: 2px solid transparent; transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast); }
.toc-list a::before { content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%); width: 2px; height: 0; background: hsl(var(--chino)); transition: height var(--t-fast); border-radius: 1px; }
.toc-list a:hover { color: var(--color-foreground); background: var(--color-surface-2); }
.toc-list a.is-active { color: var(--color-chino); font-weight: 600; background: hsla(var(--chino), .1); }
.toc-list a.is-active::before { height: 68%; background: linear-gradient(to bottom, hsl(var(--chino)), hsl(var(--accent))); width: 3px; }
.toc-list a.toc-h3 { padding-left: 1.75rem; font-size: var(--fz-xs); line-height: 1.45; color: var(--color-subtle); }
.toc-list a.toc-h3::before { left: .5rem; }
.toc-empty { font-size: var(--fz-xs); color: var(--color-subtle); font-style: italic; padding: .5rem; }

/* cover hero */
.post-cover-hero { position: relative; width: 100%; aspect-ratio: 21 / 9; border-radius: var(--radius-2xl); overflow: hidden; margin-bottom: var(--space-6); border: 1px solid var(--color-divider-soft); box-shadow: var(--shadow-md); background: linear-gradient(135deg, hsla(var(--chino), .15), hsla(var(--accent), .1)); }
.post-cover-hero img { width: 100%; height: 100%; object-fit: cover; }
.post-cover-hero::after { content: ''; position: absolute; inset: 0; background: linear-gradient(to top, hsla(0,0%,0%,.4) 0%, transparent 50%); }

/* author meta row */
.post-author-row { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-3); margin-bottom: var(--space-6); background: var(--color-surface); border: 1px solid var(--color-divider-soft); border-radius: var(--radius-xl); }
.post-author-avatar { width: 2.5rem; height: 2.5rem; border-radius: var(--radius-md); object-fit: cover; flex-shrink: 0; }
.post-author-info { display: flex; flex-direction: column; gap: .125rem; min-width: 0; flex: 1; }
.post-author-name { font-weight: 700; font-size: var(--fz-sm); color: var(--color-foreground); }
.post-author-meta { font-size: var(--fz-xs); color: var(--color-muted); display: flex; flex-wrap: wrap; gap: .25rem var(--space-3); }
.post-author-meta span { display: inline-flex; align-items: center; gap: .25rem; }
.post-author-meta svg { width: .75rem; height: .75rem; }

/* prev/next navigation */
.post-nav { display: grid; grid-template-columns: 1fr; gap: var(--space-3); margin-top: var(--space-8); padding-top: var(--space-6); border-top: 1px solid var(--color-divider-soft); }
@media (min-width: 640px) { .post-nav { grid-template-columns: 1fr 1fr; } }
.post-nav-item { display: flex; flex-direction: column; gap: .25rem; padding: var(--space-4); border-radius: var(--radius-lg); background: var(--color-surface); border: 1px solid var(--color-divider-soft); text-decoration: none; transition: transform var(--t-fast), box-shadow var(--t-fast), border-color var(--t-base); }
.post-nav-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); border-color: hsla(var(--chino), .25); }
.post-nav-item.next { text-align: right; }
.post-nav-label { font-size: var(--fz-xs); color: var(--color-muted); display: inline-flex; align-items: center; gap: .25rem; }
.post-nav-label svg { width: .75rem; height: .75rem; }
.post-nav-title { font-weight: 600; font-size: var(--fz-sm); color: var(--color-foreground); line-height: 1.4; }
.post-nav-item:hover .post-nav-title { color: var(--color-chino); }

/* compat: old single-column post-container */
.post-header { margin-bottom: var(--space-8); padding-bottom: var(--space-6); border-bottom: 1px solid var(--color-divider-soft); }
.post-title { font-family: var(--font-display); font-size: clamp(1.75rem, 2vw + 1rem, var(--fz-5xl)); font-weight: 800; line-height: 1.2; letter-spacing: -.03em; color: var(--color-foreground); margin: 0 0 var(--space-4); text-wrap: balance; }
.post-meta { display: flex; align-items: center; flex-wrap: wrap; gap: .25rem var(--space-4); font-size: var(--fz-sm); color: var(--color-muted); }
.post-meta > span, .post-meta > a { display: inline-flex; align-items: center; gap: .375rem; }
.post-meta svg { width: 1rem; height: 1rem; }
.post-meta a { color: inherit; text-decoration: none; }
.post-meta a:hover { color: var(--color-chino); }
.post-cover { width: calc(100% + 2 * var(--space-4)); margin: var(--space-6) calc(-1 * var(--space-4)); aspect-ratio: 21/9; border-radius: var(--radius-2xl); overflow: hidden; background: var(--color-divider-soft); }
@media (min-width: 768px) { .post-cover { width: 100%; margin: var(--space-6) 0; } }
.post-cover img { width: 100%; height: 100%; object-fit: cover; }

.post-footer { margin-top: var(--space-12); padding-top: var(--space-6); border-top: 1px solid var(--color-divider-soft); display: flex; flex-direction: column; gap: var(--space-6); }
.post-footer-tags { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; }
.post-footer-tags-label { font-size: var(--fz-sm); color: var(--color-muted); display: inline-flex; align-items: center; gap: .375rem; }
.post-footer-actions { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }

/* ── Archive (timeline) ──────────────────────────────────── */
.timeline { position: relative; padding-left: var(--space-8); }
.timeline::before { content: ''; position: absolute; top: 0; bottom: 0; left: .625rem; width: 2px; background: linear-gradient(to bottom, var(--color-divider-soft), transparent); }
.timeline-year { position: relative; font-family: var(--font-display); font-size: var(--fz-3xl); font-weight: 800; letter-spacing: -.02em; color: var(--color-foreground); margin: var(--space-8) 0 var(--space-4); display: flex; align-items: baseline; gap: var(--space-3); }
.timeline-year::before { content: ''; position: absolute; left: calc(-1 * var(--space-8) + .25rem); top: 50%; transform: translateY(-50%); width: .875rem; height: .875rem; border-radius: 50%; background: hsl(var(--chino)); box-shadow: 0 0 0 4px var(--color-surface), 0 0 0 6px hsla(var(--chino), .25); }
.timeline-year .count { font-size: var(--fz-sm); color: var(--color-muted); font-weight: 500; }
.timeline-year:first-child { margin-top: 0; }
.timeline-item { position: relative; display: flex; align-items: center; gap: var(--space-3); padding: var(--space-3) var(--space-4); margin-bottom: var(--space-2); border-radius: var(--radius-lg); color: var(--color-foreground); text-decoration: none; transition: background var(--t-fast), transform var(--t-fast); }
.timeline-item::before { content: ''; position: absolute; left: calc(-1 * var(--space-8) + .5rem); top: 50%; transform: translateY(-50%); width: .5rem; height: .5rem; border-radius: 50%; background: var(--color-surface); border: 2px solid hsl(var(--chino)); transition: background var(--t-fast), transform var(--t-fast); }
.timeline-item:hover { background: hsla(var(--chino), .08); transform: translateX(4px); }
.timeline-item:hover::before { background: hsl(var(--chino)); transform: translateY(-50%) scale(1.4); }
.timeline-date { font-family: var(--font-mono); font-size: var(--fz-sm); color: var(--color-muted); flex-shrink: 0; min-width: 5rem; }
.timeline-text { font-size: var(--fz-sm); color: var(--color-foreground); font-weight: 500; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.timeline-text:hover { color: var(--color-chino); }
.timeline-cat { font-size: var(--fz-2xs); padding: 1px 6px; border-radius: var(--radius-sm); background: color-mix(in srgb, var(--cat-color, #4672BC), transparent 85%); color: var(--cat-color, #4672BC); font-weight: 600; flex-shrink: 0; }

/* ── Empty state ─────────────────────────────────────────── */
.empty-state { text-align: center; padding: 4rem 1.5rem; color: var(--color-muted); }
.empty-state .empty-icon { width: 4rem; height: 4rem; border-radius: var(--radius-full); background: var(--color-surface-2); display: inline-flex; align-items: center; justify-content: center; color: var(--color-subtle); margin-bottom: var(--space-4); }
.empty-state .empty-icon svg { width: 2rem; height: 2rem; }
.empty-state h3 { font-family: var(--font-display); font-size: var(--fz-xl); color: var(--color-foreground); margin-bottom: var(--space-2); }
.empty-state p { font-size: var(--fz-sm); }

/* ── 404 / Error page ──────────────────────────────────── */
.notfound { text-align: center; padding: 5rem 1.5rem; max-width: 32rem; margin-inline: auto; }
.notfound-code { font-family: var(--font-display); font-size: clamp(4rem, 12vw, 8rem); font-weight: 800; line-height: 1; letter-spacing: -.04em; background: linear-gradient(135deg, hsl(var(--chino)), hsl(var(--accent))); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; color: transparent; }
.notfound h1 { font-family: var(--font-display); font-size: var(--fz-2xl); color: var(--color-foreground); margin: var(--space-4) 0 var(--space-2); }
.notfound p { color: var(--color-muted); margin-bottom: var(--space-6); }
.error-page { text-align: center; padding: 5rem 1.5rem; max-width: 32rem; margin-inline: auto; }
.error-code { font-family: var(--font-display); font-size: clamp(4rem, 12vw, 8rem); font-weight: 800; line-height: 1; letter-spacing: -.04em; background: linear-gradient(135deg, hsl(var(--chino)), hsl(var(--accent))); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; color: transparent; }
.error-page h2 { font-family: var(--font-display); font-size: var(--fz-2xl); color: var(--color-foreground); margin: var(--space-4) 0 var(--space-2); }
.error-page p { color: var(--color-muted); margin-bottom: var(--space-6); }
.error-cta { display: flex; gap: var(--space-3); justify-content: center; flex-wrap: wrap; }

/* ── 超小竖屏（≤420px）：双列网格降级为单列，杜绝窄屏水平溢出 ── */
@media (max-width: 420px) {
  .posts-grid, .save-grid { grid-template-columns: 1fr; }
  .post-nav { grid-template-columns: 1fr; }
  .hero-stats, .hero-shortcuts { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .post-author-row { flex-wrap: wrap; }
}
/* 网格子项允许收缩，避免长内容/长单词撑出水平溢出 */
.posts-grid > *, .save-grid > *, .cat-grid > *, .links-grid > * { min-width: 0; }

/* ─────────────────────────────────────────────────────────────────────────────
   9.  UTILITIES
   ───────────────────────────────────────────────────────────────────────────── */
.flex { display: flex; } .inline-flex { display: inline-flex; }
.items-center { align-items: center; } .items-start { align-items: flex-start; }
.justify-between { justify-content: space-between; } .justify-center { justify-content: center; }
.flex-col { flex-direction: column; } .flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: var(--space-1); } .gap-2 { gap: var(--space-2); } .gap-3 { gap: var(--space-3); } .gap-4 { gap: var(--space-4); } .gap-6 { gap: var(--space-6); }
.w-full { width: 100%; } .h-full { height: 100%; } .max-w-full { max-width: 100%; }
.mt-2 { margin-top: var(--space-2); } .mt-4 { margin-top: var(--space-4); } .mt-6 { margin-top: var(--space-6); } .mt-8 { margin-top: var(--space-8); }
.mb-2 { margin-bottom: var(--space-2); } .mb-4 { margin-bottom: var(--space-4); } .mb-6 { margin-bottom: var(--space-6); }
.text-center { text-align: center; }
.relative { position: relative; }
.hidden { display: none; } .block { display: block; } .grid-full { display: grid; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ─────────────────────────────────────────────────────────────────────────────
   10.  MOTION / A11Y / PRINT
   ───────────────────────────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}
@media print {
  .navbar, .footer, .scroll-progress, .back-to-top, .mobile-drawer, .mobile-backdrop, .post-toc, .post-rail, .post-footer-actions, .breadcrumb { display: none !important; }
  .bg-layer { display: none; }
  body { background: #fff; color: #000; }
  .post-wrap { display: block; }
  .post-container { max-width: 100%; }
}