/* Grace's site — classic personal blog, content-first */

:root {
  --bg: #fdfdfd;
  --bg-soft: #f6f6f3;
  --bg-soft-2: #efeeea;
  --ink: #222222;
  --ink-soft: #444444;
  --ink-mute: #777777;
  --ink-faint: #999999;
  --rule: #e6e4dd;
  --accent: #d26911;
  --accent-hover: #b35309;
  --max: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1917;
    --bg-soft: #232220;
    --bg-soft-2: #2c2b28;
    --ink: #e8e6df;
    --ink-soft: #c0bdb3;
    --ink-mute: #8a8780;
    --ink-faint: #6a6760;
    --rule: #34322c;
    --accent: #e8884a;
    --accent-hover: #f29960;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Helvetica Neue", -apple-system, BlinkMacSystemFont, "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei",
               Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

.wrap-wide {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- Top header ---------- */
.topnav {
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
  padding: 22px 0;
}
.topnav .row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.topnav .brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.topnav .brand a { color: var(--ink); text-decoration: none; }
.topnav .brand a:hover { color: var(--accent); }
.topnav .brand .tagline {
  font-size: 13px;
  font-weight: 400;
  color: var(--ink-mute);
  margin-left: 10px;
}
.topnav nav {
  display: flex;
  gap: 22px;
  font-size: 14px;
}
.topnav nav a {
  color: var(--ink-soft);
  text-decoration: none;
  white-space: nowrap;
}
.topnav nav a:hover, .topnav nav a.active {
  color: var(--accent);
}
.topnav nav a.nav-ext {
  margin-left: 6px;
  padding: 2px 10px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  font-size: 13px;
  color: var(--ink-soft);
  transition: all .15s;
}
.topnav nav a.nav-ext:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(210, 105, 17, 0.06);
}

/* ---------- Page intro (smaller than hero) ---------- */
.page-intro {
  padding: 32px 0 18px;
  border-bottom: 1px dashed var(--rule);
  margin-bottom: 32px;
}
.page-intro h1 {
  font-size: 28px;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.page-intro p {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 0 0 6px;
}

/* ---------- Home directory cards ---------- */
.home-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 36px 0 12px;
}
.home-card {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 18px;
  padding: 22px 24px;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 6px;
  color: var(--ink);
  text-decoration: none;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.home-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.04);
}
.home-card .hc-num {
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.home-card .hc-num-text {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 28px;
}
.home-card .hc-meta { min-width: 0; }
.home-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 4px;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.home-card .hc-meta p {
  font-size: 12px;
  color: var(--ink-mute);
  margin: 0;
  line-height: 1.5;
}
.home-card .hc-arrow {
  font-size: 18px;
  color: var(--ink-mute);
  transition: color .15s, transform .15s;
}
.home-card:hover .hc-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

/* ---------- Feed section header ---------- */
.feed-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 22px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink);
}
.feed-head h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.feed-head .feed-more {
  font-size: 13px;
  color: var(--ink-soft);
  text-decoration: none;
}
.feed-head .feed-more:hover { color: var(--accent); }

@media (max-width: 840px) {
  .home-cards { grid-template-columns: 1fr; gap: 12px; margin: 28px 0 8px; }
  .home-card { padding: 16px 18px; }
  .home-card .hc-num { font-size: 26px; }
}

/* ---------- Two-column layout ---------- */
.cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 56px;
  padding: 48px 0 64px;
}

/* ---------- Main feed (article excerpts) ---------- */
.feed article.entry {
  padding: 4px 0 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--rule);
}
.feed article.entry:last-child {
  border-bottom: none;
}
.entry-title {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.entry-title a {
  color: var(--ink);
  text-decoration: none;
}
.entry-title a:hover { color: var(--accent); }
.entry-meta {
  font-size: 13px;
  color: var(--ink-mute);
  margin: 0 0 14px;
}
.entry-meta .cat {
  margin-left: 10px;
  padding: 1px 8px;
  background: var(--bg-soft);
  border-radius: 3px;
  font-size: 12px;
  color: var(--ink-soft);
}
.entry-excerpt {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 14px;
}
.entry-excerpt p { margin: 0 0 10px; }
.entry-more a {
  font-size: 14px;
  color: var(--accent);
  text-decoration: none;
}
.entry-more a:hover { text-decoration: underline; }

/* ---------- Compact list (e.g. /blog/) ---------- */
.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.post-list li {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 18px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
}
.post-list li:last-child { border-bottom: none; }
.post-list time {
  font-size: 13px;
  color: var(--ink-mute);
  font-variant-numeric: tabular-nums;
}
.post-list a {
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
}
.post-list a:hover { color: var(--accent); }
.post-list .cat {
  font-size: 12px;
  color: var(--ink-faint);
}

/* ---------- Sidebar ---------- */
.sidebar {
  font-size: 14px;
}
.sidebar .widget {
  margin-bottom: 36px;
}
.sidebar .widget h3 {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
  letter-spacing: 0.02em;
}
.sidebar ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.sidebar li {
  padding: 6px 0;
  border-bottom: 1px dashed var(--rule);
  line-height: 1.55;
}
.sidebar li:last-child { border-bottom: none; }
.sidebar a {
  color: var(--ink-soft);
  text-decoration: none;
}
.sidebar a:hover { color: var(--accent); }
.sidebar .rss-badge {
  margin-left: 4px;
  font-size: 12px;
}
.sidebar .count {
  color: var(--ink-faint);
  font-size: 12px;
  margin-left: 6px;
}
.sidebar .about-box {
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  padding: 16px;
  border-radius: 4px;
  font-size: 13px;
  color: var(--ink-soft);
  line-height: 1.75;
  text-align: center;
}
.sidebar .about-box .about-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  margin: 4px auto 14px;
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 1px var(--rule);
}
.sidebar .about-box p {
  margin: 0 0 10px;
  text-align: left;
}
.sidebar .about-box p:last-child { margin-bottom: 0; }
.sidebar .about-box strong { color: var(--ink); }

/* ---------- Search box ---------- */
.search-box {
  position: relative;
}
.search-box input[type="search"] {
  width: 100%;
  padding: 8px 12px;
  font-family: inherit;
  font-size: 13px;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  -webkit-appearance: none;
}
.search-box input[type="search"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(210, 105, 17, 0.12);
}
.search-results {
  display: none;
  position: absolute;
  top: 38px;
  left: 0;
  right: 0;
  z-index: 20;
  margin: 0;
  padding: 4px 0;
  list-style: none;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  max-height: 70vh;
  overflow-y: auto;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}
.search-results.show { display: block; }
.search-results li {
  padding: 0;
  border: none !important;
  border-bottom: 1px solid var(--rule) !important;
}
.search-results li:last-child { border-bottom: none !important; }
.search-results li.empty {
  padding: 14px;
  color: var(--ink-mute);
  font-size: 13px;
  text-align: center;
}
.search-results a {
  display: block;
  padding: 10px 12px;
  color: var(--ink) !important;
  text-decoration: none;
  transition: background .12s;
}
.search-results a:hover {
  background: var(--bg-soft);
}
.search-results .r-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
  margin-bottom: 3px;
}
.search-results .r-meta {
  font-size: 11px;
  color: var(--ink-mute);
  margin-bottom: 4px;
}
.search-results .r-snip {
  font-size: 12px;
  color: var(--ink-soft);
  line-height: 1.5;
}
.search-results mark {
  background: rgba(210, 105, 17, 0.18);
  color: var(--accent);
  padding: 0 2px;
  border-radius: 2px;
}

/* ---------- WeChat box ---------- */
.wechat-box {
  text-align: center;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 14px 12px 12px;
}
.wechat-qr {
  width: 100%;
  max-width: 180px;
  height: auto;
  display: block;
  margin: 0 auto 8px;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: #fff;
}
.wechat-cap {
  font-size: 12px;
  color: var(--ink-mute);
  margin: 0 0 10px;
}
.wechat-id {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 8px 0 0;
  padding-top: 8px;
  border-top: 1px dashed var(--rule);
}
.wechat-id code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  background: var(--bg);
  border: 1px solid var(--rule);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 12px;
  color: var(--accent);
}

/* ---------- PPT card list (one per row, horizontal) ---------- */
.ppt-grid {
  display: flex;
  flex-direction: column;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.ppt-grid li {
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow: hidden;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.ppt-grid li:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}
.ppt-grid a.ppt-card-link {
  display: grid;
  grid-template-columns: 240px 1fr;
  color: var(--ink);
  text-decoration: none;
  min-height: 140px;
}
.ppt-cover {
  position: relative;
  background: var(--bg-soft);
  overflow: hidden;
  border-right: 1px solid var(--rule);
}
.ppt-cover img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .3s ease;
}
.ppt-grid li:hover .ppt-cover img {
  transform: scale(1.04);
}
.ppt-cover-fallback {
  background: linear-gradient(135deg, #f6e7d3 0%, #e8c89a 50%, #d49a6a 100%);
}
.ppt-cover-fallback span {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 56px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: -0.02em;
}
.ppt-body {
  padding: 18px 22px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.ppt-body h3 {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  margin: 0 0 8px;
  letter-spacing: -0.005em;
  color: var(--ink);
}
.ppt-grid li:hover .ppt-body h3 { color: var(--accent); }
.ppt-meta {
  margin-bottom: 10px;
}
.ppt-meta time {
  font-size: 13px;
  color: var(--ink-mute);
  font-variant-numeric: tabular-nums;
}
.ppt-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}
.ppt-tag {
  font-size: 12px;
  color: var(--ink-mute);
  background: var(--bg-soft);
  padding: 2px 8px;
  border-radius: 3px;
  line-height: 1.5;
  white-space: nowrap;
}
.ppt-grid li:hover .ppt-tag {
  background: rgba(210, 105, 17, 0.08);
  color: var(--accent);
}

@media (max-width: 600px) {
  .ppt-grid a.ppt-card-link {
    grid-template-columns: 1fr;
  }
  .ppt-cover {
    height: 0;
    padding-bottom: 56.25%;
    border-right: none;
    border-bottom: 1px solid var(--rule);
  }
  .ppt-body { padding: 14px 16px 16px; }
  .ppt-body h3 { font-size: 16px; }
}

/* ---------- Slide viewer page ---------- */
.slide-viewer-page {
  padding: 32px 0 64px;
}
.post-main .slide-viewer-page {
  padding-top: 0;
}
.slide-viewer-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding-bottom: 18px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--rule);
}
.slide-back {
  display: inline-block;
  font-size: 13px;
  color: var(--ink-soft);
  text-decoration: none;
  margin-bottom: 10px;
}
.slide-back:hover { color: var(--accent); }
.slide-viewer-head h1 {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 6px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}
.slide-meta {
  font-size: 13px;
  color: var(--ink-mute);
  font-variant-numeric: tabular-nums;
}
.slide-actions {
  display: flex;
  gap: 10px;
}

.slide-description {
  margin: 24px 0 28px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}
.slide-description p { margin: 0 0 1em; }
.slide-description h2 { font-size: 20px; margin: 1.6em 0 0.6em; font-weight: 700; }
.slide-description h3 { font-size: 17px; margin: 1.4em 0 0.5em; font-weight: 700; }
.slide-description h4 { font-size: 15px; margin: 1.2em 0 0.4em; font-weight: 700; }
.slide-description blockquote {
  margin: 1em 0;
  padding: 10px 16px;
  border-left: 3px solid var(--accent);
  background: var(--bg-soft);
  color: var(--ink-soft);
  border-radius: 0 4px 4px 0;
}
.slide-description ul, .slide-description ol {
  margin: 0.8em 0 1.2em;
  padding-left: 1.6em;
}
.slide-description li { margin-bottom: 0.3em; }
.slide-description a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(210, 105, 17, 0.3);
}
.slide-description a:hover { border-bottom-color: var(--accent); }
.slide-description code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--bg-soft);
  padding: 1px 6px;
  border-radius: 3px;
  border: 1px solid var(--rule);
  color: var(--accent);
}
.slide-description img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.5em auto;
  border-radius: 6px;
  border: 1px solid var(--rule);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}
.slide-description table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.4em 0 1.6em;
  font-size: 14.5px;
  line-height: 1.6;
}
.slide-description th,
.slide-description td {
  border: 1px solid var(--rule);
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
}
.slide-description th {
  background: var(--bg-soft);
  font-weight: 600;
  color: var(--ink);
}
.slide-description hr {
  border: none;
  border-top: 1px dashed var(--rule);
  margin: 2em 0;
}
.slide-description strong { color: var(--ink); }

/* Closing contact card */
.contact-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 36px;
  margin: 36px 0 12px;
  padding: 32px;
  background: linear-gradient(135deg, #1a1917 0%, #25231f 100%);
  border-radius: 10px;
  color: #ece8de;
}
.contact-qr-block {
  text-align: center;
}
.contact-qr-block img {
  width: 100%;
  max-width: 240px;
  height: auto;
  margin: 0 auto 14px !important;
  border: 4px solid #ffffff;
  border-radius: 4px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35) !important;
  display: block;
}
.contact-cap {
  font-size: 14px;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 14px !important;
  letter-spacing: 0.05em;
}
.contact-id {
  font-size: 14px;
  color: #ece8de;
  margin: 8px 0 12px !important;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}
.contact-id code {
  background: rgba(255, 255, 255, 0.1) !important;
  border: 1px solid rgba(255, 255, 255, 0.2) !important;
  color: var(--accent) !important;
  padding: 2px 10px !important;
  font-size: 13px;
  font-weight: 600;
}
.contact-note {
  font-size: 12.5px;
  color: #b8b3a5;
  margin: 0 !important;
  line-height: 1.6;
}
.contact-note strong {
  color: var(--accent) !important;
}
.contact-hiring h3 {
  font-size: 15px !important;
  font-weight: 700;
  color: var(--accent) !important;
  margin: 0 0 18px !important;
  padding: 0 !important;
  letter-spacing: 0.08em;
  border: none !important;
}
.contact-hiring ul {
  list-style: none !important;
  padding: 0 !important;
  margin: 0 0 22px !important;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 6px 14px;
}
.contact-hiring li {
  font-size: 15px;
  color: #ece8de;
  font-weight: 500;
  padding: 6px 0;
  margin: 0 !important;
}
.contact-hiring li::before {
  content: "·";
  color: var(--accent);
  margin-right: 8px;
  font-weight: 700;
}
.contact-call {
  font-size: 16px;
  color: var(--accent) !important;
  font-weight: 600 !important;
  margin: 0 !important;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

@media (max-width: 720px) {
  .contact-card {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 22px;
  }
  .contact-qr-block img { max-width: 200px; }
  .contact-hiring ul { grid-template-columns: repeat(2, 1fr); }
}

.slide-tags {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.slide-tag {
  font-size: 12px;
  color: var(--ink-mute);
  background: var(--bg-soft);
  padding: 2px 8px;
  border-radius: 3px;
}
.slide-download {
  display: inline-block;
  padding: 8px 18px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  border-radius: 4px;
  text-decoration: none;
  transition: background .15s;
}
.slide-download:hover { background: var(--accent-hover); color: #fff; text-decoration: none; }

.slide-bottom-actions {
  display: flex;
  gap: 12px;
  margin-top: 18px;
  flex-wrap: wrap;
}
.slide-bottom-actions .slide-download { flex: 1 1 200px; text-align: center; }
.slide-open-new {
  flex: 1 1 200px;
  text-align: center;
  display: inline-block;
  padding: 8px 18px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
  background: var(--bg);
  transition: all .15s;
}
.slide-open-new:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

/* Download corner button on PPT cards */
.ppt-card { position: relative; }
.ppt-card-link { display: block; }
.ppt-card-download {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  z-index: 2;
  transition: background .15s, transform .15s;
  backdrop-filter: blur(4px);
}
.ppt-card-download:hover {
  background: var(--accent);
  color: #fff;
  transform: scale(1.08);
  text-decoration: none;
}

iframe.slide-viewer {
  width: 100%;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--bg-soft);
  display: block;
}
/* PDF preview can scroll multi-page → tall is fine */
iframe.slide-viewer-pdf {
  height: calc(100vh - 220px);
  min-height: 500px;
}
/* PPT preview is single 16:9 slide via Office viewer → match aspect to avoid black bars */
iframe.slide-viewer-ppt,
.slide-viewer-ppt {
  aspect-ratio: 16 / 10;
  height: auto;
  min-height: 240px;
}
#ppt-viewer-host {
  width: 100%;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--bg-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}
.slide-viewer-msg {
  padding: 60px 32px;
  text-align: center;
  color: var(--ink-mute);
  font-size: 14px;
  line-height: 1.7;
  max-width: 480px;
}

.ppt-cover-upload {
  background: linear-gradient(135deg, #fbe4cc 0%, #f3b076 50%, #d26911 100%);
}
.ppt-cover-fmt {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.05em;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

@media (max-width: 720px) {
  .wrap-wide { padding: 0 16px; }
  .slide-viewer-page { padding: 18px 0 40px; }
  .slide-viewer-head {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding-bottom: 14px;
    margin-bottom: 14px;
  }
  .slide-viewer-head h1 { font-size: 19px; line-height: 1.4; }
  .slide-back { font-size: 12px; margin-bottom: 6px; }
  .slide-meta { font-size: 12px; }
  .slide-actions { width: 100%; }
  .slide-download {
    display: block;
    width: 100%;
    text-align: center;
    padding: 10px 16px;
    font-size: 13px;
  }
  .slide-description {
    margin: 18px 0 22px;
    font-size: 14px;
    line-height: 1.8;
  }
  .slide-description h2 { font-size: 17px; margin: 1.4em 0 0.5em; }
  .slide-description h3 { font-size: 15px; margin: 1.2em 0 0.4em; }
  .slide-tags { gap: 5px; margin-top: 8px; }
  .slide-tag { font-size: 11px; padding: 2px 7px; }
  iframe.slide-viewer { border-radius: 4px; }
  iframe.slide-viewer-pdf { height: 70vh; min-height: 320px; }
  iframe.slide-viewer-ppt,
  .slide-viewer-ppt { aspect-ratio: 16 / 10; min-height: 200px; }
  .slide-viewer-msg { padding: 36px 18px; font-size: 13px; }
}

@media (max-width: 420px) {
  iframe.slide-viewer-pdf { height: 60vh; min-height: 280px; }
}

/* ---------- Yearly groups ---------- */
.yearly-group {
  margin-bottom: 36px;
}
.yearly-year {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 12px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--accent);
  letter-spacing: -0.01em;
  display: inline-block;
}

/* ---------- Filter bar ---------- */
.filter-bar {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 22px;
  font-size: 13px;
}
.filter-bar a {
  padding: 4px 12px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--ink-soft);
  text-decoration: none;
  background: var(--bg);
}
.filter-bar a:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.filter-bar a.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ---------- Post article (single-post page) ---------- */
.post-main {
  min-width: 0;
}
.post-article {
  padding: 28px 0 32px;
}
.post-head {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--rule);
}
.post-cat-line {
  margin-bottom: 12px;
}
.post-cat {
  display: inline-block;
  font-size: 12px;
  color: var(--accent);
  background: rgba(210, 105, 17, 0.08);
  padding: 2px 10px;
  border-radius: 3px;
  text-decoration: none;
  letter-spacing: 0.05em;
}
.post-cat:hover {
  background: rgba(210, 105, 17, 0.16);
  text-decoration: none;
}
.post-title-h1 {
  font-size: 30px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.35;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.post-byline {
  font-size: 13px;
  color: var(--ink-mute);
}

/* ---------- Feishu callout block ---------- */
.callout {
  margin: 1.4em 0;
  padding: 14px 18px;
  background: rgba(210, 105, 17, 0.06);
  border-left: 3px solid var(--accent);
  border-radius: 0 4px 4px 0;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.75;
}
.callout p { margin: 0; }

/* ---------- Markdown body ---------- */
.post-content {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}
.post-content p {
  margin: 0 0 1.2em;
}
.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin: 1.8em 0 0.7em;
  line-height: 1.4;
}
.post-content h1 { font-size: 24px; }
.post-content h2 {
  font-size: 21px;
}
.post-content h3 { font-size: 18px; }
.post-content h4 { font-size: 16px; }
.post-content h2 a.headerlink,
.post-content h3 a.headerlink {
  display: none;
}
.post-content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(210, 105, 17, 0.3);
  padding-bottom: 1px;
  transition: border-color .15s, background .15s;
}
.post-content a:hover {
  border-bottom-color: var(--accent);
  background: rgba(210, 105, 17, 0.06);
}
.post-content strong {
  color: var(--ink);
  font-weight: 700;
}
.post-content em { font-style: italic; color: var(--ink); }
.post-content blockquote {
  margin: 1.4em 0;
  padding: 12px 18px;
  border-left: 3px solid var(--accent);
  background: var(--bg-soft);
  color: var(--ink-soft);
  font-size: 15px;
  border-radius: 0 4px 4px 0;
}
.post-content blockquote p { margin: 0 0 8px; }
.post-content blockquote p:last-child { margin: 0; }
.post-content ul, .post-content ol {
  margin: 1em 0 1.4em;
  padding-left: 1.8em;
}
.post-content li {
  margin-bottom: 0.4em;
}
.post-content li > ul, .post-content li > ol {
  margin: 0.4em 0;
}
.post-content code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--accent);
  word-break: break-word;
}
.post-content pre {
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 14px 18px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.6;
  margin: 1.2em 0 1.4em;
}
.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--ink);
  font-size: inherit;
}
.post-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.2em auto;
  border-radius: 4px;
  border: 1px solid var(--rule);
}
.post-content hr {
  border: none;
  border-top: 1px dashed var(--rule);
  margin: 2em 0;
}
.post-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.2em 0 1.4em;
  font-size: 14px;
}
.post-content th, .post-content td {
  border: 1px solid var(--rule);
  padding: 8px 12px;
  text-align: left;
}
.post-content th {
  background: var(--bg-soft);
  font-weight: 600;
}
.post-content iframe {
  max-width: 100%;
  border: 1px solid var(--rule);
  border-radius: 4px;
}

/* Post tags (article footer) */
.post-tags {
  margin-top: 32px;
  padding-top: 18px;
  border-top: 1px dashed var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.post-tag {
  font-size: 12px;
  color: var(--ink-mute);
  background: var(--bg-soft);
  padding: 3px 10px;
  border-radius: 3px;
  white-space: nowrap;
}

/* ---------- Post WeChat block (article footer) ---------- */
.post-wechat {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-top: 36px;
  padding: 22px 24px;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 6px;
}
.post-wechat-qr {
  width: 110px;
  height: 110px;
  flex-shrink: 0;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 4px;
}
.post-wechat-text { flex: 1; min-width: 0; }
.post-wechat-text h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 6px;
}
.post-wechat-text p {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 0 0 6px;
}
.post-wechat-text p:last-child { margin: 0; }
.post-wechat-id {
  margin-top: 8px !important;
  padding-top: 8px;
  border-top: 1px dashed var(--rule);
  font-size: 13px;
}
.post-wechat-id code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  background: var(--bg);
  border: 1px solid var(--rule);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 12px;
  color: var(--accent);
}

/* ---------- Comments section ---------- */
.post-comments {
  margin-top: 36px;
  padding: 24px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
}
.post-comments > h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 18px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
  letter-spacing: 0.02em;
}
.comments-list {
  margin-bottom: 28px;
  padding-bottom: 22px;
  border-bottom: 1px dashed var(--rule);
}
.comments-empty {
  font-size: 13px;
  color: var(--ink-mute);
  margin: 0;
  padding: 8px 0;
}
.comment-form-wrap h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 6px;
}
.post-comments-hint {
  font-size: 13px;
  color: var(--ink-mute);
  margin: 0 0 18px;
}
.comment-status {
  font-size: 13px;
  margin-top: 6px;
  flex-basis: 100%;
}
.comment-status.pending { color: var(--ink-mute); }
.comment-status.ok { color: #2d8b48; }
.comment-status.err { color: #c0392b; }
.comment-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.comment-form .comment-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.comment-form label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 13px;
  color: var(--ink-soft);
}
.comment-form label span em {
  color: var(--accent);
  font-style: normal;
  margin-left: 2px;
}
.comment-form input,
.comment-form textarea {
  font-family: inherit;
  font-size: 14px;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 8px 12px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  -webkit-appearance: none;
  width: 100%;
}
.comment-form input:focus,
.comment-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(210, 105, 17, 0.12);
}
.comment-form textarea {
  resize: vertical;
  min-height: 96px;
  line-height: 1.6;
}
.comment-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 4px;
  flex-wrap: wrap;
}
.comment-form button {
  font-family: inherit;
  font-size: 14px;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 4px;
  padding: 8px 22px;
  cursor: pointer;
  transition: background .15s;
}
.comment-form button:hover { background: var(--accent-hover); }
.comment-note {
  font-size: 12px;
  color: var(--ink-mute);
}

@media (max-width: 600px) {
  .post-wechat { flex-direction: column; align-items: flex-start; padding: 18px; }
  .post-wechat-qr { width: 130px; height: 130px; }
  .comment-form .comment-row { grid-template-columns: 1fr; }
}

/* Prev / Next nav */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}
.post-nav .prev, .post-nav .next {
  display: block;
  padding: 14px 16px;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 4px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: border-color .15s, color .15s;
}
.post-nav .prev:hover, .post-nav .next:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.post-nav .next { text-align: right; }
.post-nav span.prev, .post-nav span.next {
  background: transparent;
  border-color: transparent;
}

@media (max-width: 720px) {
  .post-title-h1 { font-size: 24px; }
  .post-content { font-size: 15px; line-height: 1.8; }
  .post-content h1 { font-size: 21px; }
  .post-content h2 { font-size: 19px; }
  .post-content h3 { font-size: 17px; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav .next { text-align: left; }
}

/* ---------- Footer ---------- */
footer.site-foot {
  border-top: 1px solid var(--rule);
  padding: 32px 0 48px;
  color: var(--ink-mute);
  font-size: 13px;
  text-align: center;
}
footer.site-foot a {
  color: var(--ink-soft);
  text-decoration: none;
  margin: 0 12px;
}
footer.site-foot a:hover { color: var(--accent); }
footer.site-foot .copyright {
  margin-top: 10px;
  color: var(--ink-faint);
  font-size: 12px;
}

/* ---------- Mobile ---------- */
@media (max-width: 840px) {
  .cols {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .sidebar { order: 2; }
}

@media (max-width: 600px) {
  body { font-size: 14px; }
  .wrap { padding: 0 18px; }
  .topnav .row { gap: 10px; }
  .topnav .brand { font-size: 17px; }
  .topnav .brand .tagline { display: none; }
  .topnav nav { gap: 10px; font-size: 13px; }
  .topnav nav a.nav-ext { display: none; }
  .home-cards { display: none; }
  .page-intro h1 { font-size: 22px; }
  .entry-title { font-size: 19px; }
  .entry-excerpt { font-size: 14px; line-height: 1.8; }
  .post-list li {
    grid-template-columns: 1fr;
    gap: 2px;
  }
  .post-list time { font-size: 12px; }
}