/* ============================================================
   ztow Blog — 2026 redesign
   纸与墨 · 编辑体 · 深浅双主题
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  color-scheme: light;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", SimSun, serif;
  --font-mono: "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --bg: #faf8f5;
  --bg-soft: #f2eee7;
  --surface: #ffffff;
  --text: #242019;
  --text-2: #5b5344;
  --text-3: #8d8473;
  --line: rgba(36, 32, 25, 0.12);
  --line-strong: rgba(36, 32, 25, 0.24);
  --accent: #7c3aed;
  --accent-2: #db2777;
  --accent-soft: rgba(124, 58, 237, 0.09);
  --gradient: linear-gradient(120deg, #7c3aed 0%, #db2777 100%);
  --code-bg: #1e1d2b;
  --code-text: #e9e7f2;
  --selection: rgba(124, 58, 237, 0.18);
  --shadow-sm: 0 1px 2px rgba(36, 32, 25, 0.05), 0 4px 14px rgba(36, 32, 25, 0.05);
  --shadow-md: 0 8px 30px rgba(36, 32, 25, 0.10);
  --radius: 12px;
  --content-width: 760px;
  --nav-h: 60px;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f0e13;
  --bg-soft: #17151e;
  --surface: #1d1a26;
  --text: #ece9e2;
  --text-2: #b0a99c;
  --text-3: #7b7466;
  --line: rgba(236, 233, 226, 0.12);
  --line-strong: rgba(236, 233, 226, 0.24);
  --accent: #a78bfa;
  --accent-2: #f472b6;
  --accent-soft: rgba(167, 139, 250, 0.14);
  --code-bg: #141320;
  --code-text: #e9e7f2;
  --selection: rgba(167, 139, 250, 0.26);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25), 0 4px 14px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.35);
}

/* ---------- Reset / base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 0.3s ease, color 0.3s ease;
}

::selection {
  background: var(--selection);
}

img {
  max-width: 100%;
  height: auto;
}

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

a:hover {
  color: var(--accent-2);
}

button {
  font-family: inherit;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding-left: 28px;
  padding-right: 28px;
}

.narrow {
  max-width: var(--content-width);
}

.skip-link {
  position: fixed;
  top: -48px;
  left: 16px;
  z-index: 200;
  padding: 8px 16px;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 12px;
}

/* ---------- Progress bar ---------- */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 120;
  height: 3px;
  width: 0;
  background: var(--gradient);
  transition: width 0.08s linear;
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background-color 0.3s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  gap: 24px;
}

.brand {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.brand:hover {
  color: var(--text);
}

.brand-dot {
  color: transparent;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  position: relative;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  color: var(--text-2);
  padding: 6px 2px;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--text);
}

.nav-links a:hover::after,
.nav-links a.is-active::after {
  transform: scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
}

.theme-toggle {
  position: relative;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.theme-icon {
  position: absolute;
  width: 16px;
  height: 16px;
  transition: opacity 0.25s ease, transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-icon-sun {
  border-radius: 50%;
  box-shadow: inset 0 0 0 2px var(--text);
}

.theme-icon-sun::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 50%, transparent 58%, var(--text) 60%, var(--text) 64%, transparent 66%);
}

.theme-icon-moon {
  border-radius: 50%;
  background: var(--text);
  clip-path: polygon(50% 0, 100% 38%, 78% 100%, 0 100%, 18% 42%);
  transform: rotate(-24deg) scale(0.85);
}

[data-theme="light"] .theme-icon-sun {
  opacity: 1;
  transform: rotate(0) scale(1);
}

[data-theme="light"] .theme-icon-moon {
  opacity: 0;
  transform: rotate(60deg) scale(0.4);
}

[data-theme="dark"] .theme-icon-sun {
  opacity: 0;
  transform: rotate(-60deg) scale(0.4);
}

[data-theme="dark"] .theme-icon-moon {
  opacity: 1;
  transform: rotate(-24deg) scale(0.9);
}

/* ---------- Masthead (home) ---------- */
.masthead {
  position: relative;
  padding: 108px 0 56px;
  overflow: hidden;
}

.masthead-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  will-change: transform;
}

.blob-a {
  width: 460px;
  height: 460px;
  top: -160px;
  right: 12%;
  background: radial-gradient(circle at 35% 35%, rgba(124, 58, 237, 0.22), rgba(124, 58, 237, 0));
}

.blob-b {
  width: 420px;
  height: 420px;
  bottom: -190px;
  left: 2%;
  background: radial-gradient(circle at 60% 60%, rgba(219, 39, 119, 0.18), rgba(219, 39, 119, 0));
}

.blob-c {
  width: 300px;
  height: 300px;
  top: 18%;
  left: 42%;
  background: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.12), rgba(59, 130, 246, 0));
}

[data-theme="dark"] .blob-a {
  background: radial-gradient(circle at 35% 35%, rgba(167, 139, 250, 0.20), rgba(167, 139, 250, 0));
}

[data-theme="dark"] .blob-b {
  background: radial-gradient(circle at 60% 60%, rgba(244, 114, 182, 0.16), rgba(244, 114, 182, 0));
}

.masthead-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 56px;
  align-items: center;
}

.masthead-main {
  min-width: 0;
}

.masthead-kicker {
  margin: 0 0 20px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-3);
}

.masthead-kicker::before {
  content: "";
  display: inline-block;
  width: 30px;
  height: 2px;
  margin-right: 12px;
  vertical-align: middle;
  border-radius: 2px;
  background: var(--gradient);
}

.masthead-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(3.4rem, 9vw, 6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.005em;
  color: var(--text);
}

.accent-dot {
  color: transparent;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
}

.masthead-brush {
  display: block;
  width: 240px;
  height: 18px;
  margin: 10px 0 26px -4px;
  opacity: 0.9;
}

.masthead-desc {
  margin: 0 0 32px;
  max-width: 30em;
  font-size: 1.14rem;
  line-height: 1.85;
  color: var(--text-2);
}

.masthead-stats {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  padding: 11px 24px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
}

.stat {
  font-size: 0.86rem;
  color: var(--text-2);
}

.stat strong {
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 1rem;
  margin-right: 2px;
}

.stat-sep {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--line-strong);
}

/* Masthead collage */
.masthead-collage {
  position: relative;
  height: 350px;
}

.collage-card {
  position: absolute;
  display: block;
  margin: 0;
  width: 52%;
  height: 66%;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--line);
}

.collage-card img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.collage-back {
  top: 0;
  left: 0;
  transform: rotate(-5deg);
}

.collage-third {
  top: 17%;
  left: 24%;
  transform: rotate(1deg);
  z-index: 1;
}

.collage-front {
  bottom: 0;
  right: 0;
  transform: rotate(4deg);
  z-index: 2;
}

.collage-sticker {
  position: absolute;
  top: 2%;
  left: 50%;
  transform: translateX(-50%) rotate(-3deg);
  z-index: 3;
  padding: 8px 18px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: #fff;
  background: var(--gradient);
  box-shadow: 0 8px 22px rgba(124, 58, 237, 0.35);
}

/* Featured post (home) */
.featured-post {
  position: relative;
  margin: 0 0 46px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.featured-media {
  position: relative;
  display: block;
  aspect-ratio: 16 / 6;
  overflow: hidden;
  background: var(--bg-soft);
}

.featured-media img {
  position: absolute;
  inset: 0;
  height: 100%;
  width: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.featured-body {
  padding: 28px 34px 26px;
  min-width: 0;
}

.featured-post:hover {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
  box-shadow: var(--shadow-md);
}

.featured-post:hover .featured-media img {
  transform: scale(1.04);
}

.featured-label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--text-3);
}

.featured-pin {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gradient);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.featured-title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: clamp(1.45rem, 2.8vw, 1.85rem);
  font-weight: 700;
  line-height: 1.3;
}

.featured-title a {
  color: var(--text);
}

.featured-title a:hover {
  color: var(--accent);
}

.featured-subtitle {
  margin: 0 0 16px;
  font-size: 0.98rem;
  color: var(--text-2);
}

.featured-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- Home layout ---------- */
.home-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 64px;
  padding-top: 8px;
  padding-bottom: 88px;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.section-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 700;
}

.section-mark {
  display: inline-block;
  width: 9px;
  height: 20px;
  margin-right: 12px;
  border-radius: 3px;
  vertical-align: -3px;
  background: var(--gradient);
}

.section-link {
  font-size: 0.88rem;
  color: var(--text-3);
}

.section-link:hover {
  color: var(--accent);
}

/* Post card grid */
.post-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.post-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.post-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
  box-shadow: var(--shadow-md);
}

.post-card-cover {
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-soft);
}

.post-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}

.post-card:hover .post-card-cover img {
  transform: scale(1.05);
}

.post-card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 22px 24px 20px;
}

.post-card-date {
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--text-3);
}

.post-card-title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.42;
}

.post-card-title a {
  color: var(--text);
  transition: color 0.25s ease;
}

.post-card:hover .post-card-title a {
  color: var(--accent);
}

.post-card-subtitle {
  margin: 0 0 10px;
  font-size: 0.9rem;
  color: var(--text-2);
}

.post-card-excerpt {
  margin: 0 0 14px;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--text-3);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
}

.post-item-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.card-more {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  flex: none;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--text-3);
  font-size: 0.9rem;
  transition: color 0.25s ease, background-color 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

.post-card:hover .card-more {
  color: #fff;
  background: var(--gradient);
  border-color: transparent;
  transform: translateX(2px);
}

.post-item-more {
  font-size: 0.84rem;
  color: var(--text-3);
  white-space: nowrap;
}

.more-arrow {
  display: inline-block;
  transition: transform 0.25s ease;
}

.post-item:hover .more-arrow {
  transform: translateX(4px);
}

/* Chips */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 3px 12px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-2);
  background: var(--bg-soft);
  border: 1px solid transparent;
  border-radius: 999px;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.chip:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.chip sup {
  font-size: 0.68em;
  color: var(--text-3);
}

.chip-sm {
  padding: 2px 10px;
  font-size: 0.76rem;
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-top: 44px;
}

.page-btn {
  padding: 8px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.86rem;
  color: var(--text-2);
  background: var(--surface);
  transition: color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.page-btn.is-disabled {
  opacity: 0.45;
  pointer-events: none;
}

.page-info {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-3);
}

/* ---------- Home sidebar ---------- */
.home-side {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

@media (min-width: 1025px) {
  .home-side {
    position: sticky;
    top: calc(var(--nav-h) + 24px);
    align-self: start;
  }
}

.side-card {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.side-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 14px;
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 4px var(--line);
}

.side-name {
  margin: 0 0 4px;
  font-family: var(--font-serif);
  font-size: 1.12rem;
  font-weight: 700;
}

.side-desc {
  margin: 0 0 14px;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--text-2);
}

.side-link {
  font-size: 0.84rem;
}

.side-card-title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
}

.side-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.side-rss {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 0.86rem;
  color: var(--text-2);
  background: var(--surface);
  transition: color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.side-rss:hover {
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.rss-icon {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 2px 6px;
  border-radius: 5px;
  color: #fff;
  background: var(--gradient);
}

/* ---------- Page hero ---------- */
.page-hero {
  padding: 92px 0 40px;
  text-align: center;
}

.hero-kicker {
  margin: 0 0 16px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--text-3);
}

.hero-title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 1.2;
}

.hero-desc {
  margin: 0;
  color: var(--text-2);
  font-size: 1rem;
}

.page-content {
  margin: 0 auto;
  padding-bottom: 88px;
}

/* ---------- About page ---------- */
.about-hero-card {
  text-align: center;
  padding: 44px 28px 38px;
  margin-bottom: 44px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow-sm);
}

.about-avatar {
  width: 104px;
  height: 104px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid transparent;
  background:
    linear-gradient(var(--surface), var(--surface)) padding-box,
    var(--gradient) border-box;
  box-shadow: var(--shadow-md);
}

.about-name {
  margin: 18px 0 4px;
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
}

.about-sub {
  margin: 0;
  font-size: 0.84rem;
  letter-spacing: 0.14em;
  color: var(--text-3);
}

.about-contact {
  position: relative;
  overflow: hidden;
  margin-top: 52px;
  padding: 34px 38px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow-sm);
}

.about-contact::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
  background: var(--gradient);
}

.about-contact h2 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 1.4rem;
}

.about-contact p {
  margin: 0 0 20px;
  color: var(--text-2);
}

@media (max-width: 640px) {
  .about-hero-card {
    padding: 32px 20px 28px;
  }

  .about-contact {
    padding: 26px 24px;
  }
}

/* ---------- Post hero ---------- */
.post-hero {
  position: relative;
  padding: 128px 0 72px;
  overflow: hidden;
  background: var(--gradient);
}

.post-hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center 40%;
}

.post-hero-mask {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(12, 10, 18, 0.52) 0%, rgba(12, 10, 18, 0.74) 78%, rgba(12, 10, 18, 0.88) 100%);
}

.post-hero-plain::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 90% at 18% 0%, rgba(255, 255, 255, 0.16), transparent 60%),
    radial-gradient(50% 80% at 90% 100%, rgba(0, 0, 0, 0.25), transparent 65%);
}

.post-hero-content {
  position: relative;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.post-hero-tags {
  margin-bottom: 22px;
}

.chip-hero {
  color: rgba(255, 255, 255, 0.92);
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.28);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.chip-hero:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.8);
  background: rgba(255, 255, 255, 0.24);
}

.post-hero-title {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: 0.01em;
  color: #fff;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.28);
}

.post-hero-subtitle {
  margin: 0 0 22px;
  font-size: 1.12rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.88);
}

.post-hero-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.72);
}

.post-hero-meta .meta-dot {
  color: rgba(255, 255, 255, 0.4);
}

.meta-dot {
  color: var(--line-strong);
}

.post-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 196px;
  gap: 48px;
  padding: 52px 28px 24px;
  max-width: 1180px;
}

.post-main {
  min-width: 0;
  max-width: 760px;
}

/* ---------- Post content typography ---------- */
.post-content {
  font-family: var(--font-serif);
  font-size: 1.06rem;
  line-height: 1.95;
  color: var(--text);
  word-wrap: break-word;
}

.post-content > *:first-child {
  margin-top: 0;
}

.post-content p {
  margin: 0 0 1.45em;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
  margin: 2em 0 0.8em;
  scroll-margin-top: calc(var(--nav-h) + 24px);
}

.post-content h1 {
  font-size: 1.7rem;
}

.post-content h2 {
  font-size: 1.42rem;
  padding-bottom: 0.35em;
  border-bottom: 1px solid var(--line);
}

.post-content h3 {
  font-size: 1.2rem;
}

.post-content h4 {
  font-size: 1.05rem;
}

.post-content a {
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s ease, color 0.2s ease;
}

.post-content a:hover {
  text-decoration-color: var(--accent-2);
}

.post-content ul,
.post-content ol {
  margin: 0 0 1.45em;
  padding-left: 1.6em;
}

.post-content li {
  margin: 0.35em 0;
}

.post-content li::marker {
  color: var(--accent);
}

.post-content blockquote {
  margin: 1.8em 0;
  padding: 0.4em 1.3em;
  border-left: 3px solid transparent;
  border-image: var(--gradient) 1;
  border-image-slice: 1;
  background: var(--accent-soft);
  color: var(--text-2);
  font-style: italic;
}

.post-content blockquote p {
  margin: 0.4em 0;
}

.post-content blockquote blockquote {
  background: transparent;
  margin-top: 0.8em;
}

.post-content hr {
  border: none;
  height: 1px;
  margin: 2.6em auto;
  background: var(--line);
}

.post-content img {
  display: block;
  margin: 1.8em auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.post-content img:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.16);
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 0.18em 0.45em;
  border-radius: 6px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  color: var(--text);
}

.post-content pre {
  margin: 1.8em 0;
  padding: 18px 20px;
  overflow-x: auto;
  border-radius: var(--radius);
  background: var(--code-bg);
  box-shadow: var(--shadow-sm);
  line-height: 1.65;
}

.post-content pre code {
  display: block;
  padding: 0;
  font-size: 0.86rem;
  color: var(--code-text);
  background: none;
  border: none;
  border-radius: 0;
}

.post-content table {
  width: 100%;
  margin: 1.8em 0;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  line-height: 1.7;
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.post-content th,
.post-content td {
  padding: 10px 14px;
  border: 1px solid var(--line);
  text-align: left;
}

.post-content th {
  background: var(--bg-soft);
  font-weight: 600;
  white-space: nowrap;
}

.post-content tr:nth-child(even) td {
  background: color-mix(in srgb, var(--bg-soft) 55%, transparent);
}

.post-content iframe {
  max-width: 100%;
  border-radius: var(--radius);
}

.post-content .highlight {
  margin: 1.8em 0;
}

/* Rouge syntax highlighting (dark code blocks in both themes) */
.post-content .highlight pre {
  background: var(--code-bg);
}

.highlight .c, .highlight .c1, .highlight .cm, .highlight .cs { color: #7f7ba8; font-style: italic; }
.highlight .k, .highlight .kc, .highlight .kd, .highlight .kn, .highlight .kp, .highlight .kr, .highlight .kt { color: #c792ea; }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sb, .highlight .sc, .highlight .sd, .highlight .sh, .highlight .si, .highlight .sx, .highlight .sr { color: #c3e88d; }
.highlight .na, .highlight .nb, .highlight .bp, .highlight .vc, .highlight .vg, .highlight .vi { color: #82aaff; }
.highlight .nf, .highlight .nx { color: #ffcb6b; }
.highlight .no, .highlight .nv { color: #f78c6c; }
.highlight .mi, .highlight .m, .highlight .mf, .highlight .mh, .highlight .il, .highlight .mo { color: #f78c6c; }
.highlight .o, .highlight .ow, .highlight .p { color: #89ddff; }
.highlight .gd { color: #ff5370; }
.highlight .gi { color: #c3e88d; }
.highlight .err { color: #ff5370; }
.highlight .gr { color: #ff5370; }
.highlight .ge { font-style: italic; }
.highlight .gs { font-weight: 700; }
.highlight .gu { color: #89ddff; }
.highlight .gh { color: #82aaff; font-weight: 700; }
.highlight .gp { color: #7f7ba8; }
.highlight .go { color: #7f7ba8; }
.highlight .nt { color: #c792ea; }
.highlight .nc { color: #ffcb6b; }
.highlight .nn { color: #ffcb6b; }
.highlight .se { color: #ff5370; }
.highlight .sa { color: #c3e88d; }

/* ---------- Post footer / pager ---------- */
.post-foot-tags {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 56px 0 8px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.foot-tags-label {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--text-3);
}

.post-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
}

.pager-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.pager-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.pager-card.is-empty {
  visibility: hidden;
}

.pager-next {
  text-align: right;
}

.pager-label {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--text-3);
}

.pager-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.pager-card:hover .pager-title {
  color: var(--accent);
}

.post-back {
  margin-top: 28px;
  text-align: center;
  font-size: 0.88rem;
}

/* ---------- Catalog (TOC) ---------- */
.catalog {
  display: none;
}

@media (min-width: 1120px) {
  .catalog {
    display: block;
  }
}

.catalog-inner {
  position: sticky;
  top: calc(var(--nav-h) + 32px);
  max-height: calc(100vh - var(--nav-h) - 64px);
  overflow-y: auto;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.catalog-title {
  margin: 0 0 12px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--text-3);
}

.catalog-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.catalog-list a {
  display: block;
  padding: 5px 8px;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--text-3);
  border-radius: 6px;
  border-left: 2px solid transparent;
  margin-left: -16px;
  padding-left: 18px;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.catalog-list a:hover {
  color: var(--text);
}

.catalog-list a.is-active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-soft);
}

.catalog-list a.lvl-3 {
  padding-left: 34px;
}

/* ---------- Archive ---------- */
.archive-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 48px;
  align-items: start;
  padding-bottom: 88px;
}

.archive-side {
  position: sticky;
  top: calc(var(--nav-h) + 24px);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
}

.tag-btn {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  font-size: 0.78rem;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.tag-btn sup {
  font-size: 0.62em;
  color: var(--text-3);
  margin-left: 4px;
}

.tag-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.tag-btn.is-active {
  color: #fff;
  border-color: transparent;
  background: var(--gradient);
  box-shadow: var(--shadow-sm);
}

.tag-btn.is-active sup {
  color: rgba(255, 255, 255, 0.82);
}

.archive-year {
  margin-bottom: 36px;
}

.archive-year-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
}

.archive-year-title sup {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-3);
}

.archive-year-list {
  border-top: 1px solid var(--line);
}

.archive-item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  align-items: baseline;
  gap: 18px;
  padding: 13px 4px;
  border-bottom: 1px solid var(--line);
  transition: background-color 0.2s ease, padding-left 0.25s ease;
}

.archive-item:hover {
  background: var(--bg-soft);
  padding-left: 12px;
}

.archive-item-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-3);
  white-space: nowrap;
}

.archive-item-main {
  min-width: 0;
}

.archive-item-title {
  display: inline;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.5;
}

.archive-item:hover .archive-item-title {
  color: var(--accent);
}

.archive-item-subtitle {
  display: block;
  margin-top: 2px;
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--text-3);
}

.archive-item.is-hidden,
.archive-year.is-hidden {
  display: none;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 30px 0 40px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-copy {
  margin: 0;
  font-size: 0.84rem;
  color: var(--text-3);
}

.footer-copy a {
  color: var(--text-2);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 0.84rem;
}

.back-top {
  border: none;
  background: none;
  padding: 0;
  font-size: 0.84rem;
  color: var(--text-3);
  cursor: pointer;
  transition: color 0.2s ease;
}

.back-top:hover {
  color: var(--accent);
}

/* ---------- 404 / offline ---------- */
.notfound {
  min-height: calc(100vh - var(--nav-h) - 180px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 28px 100px;
}

.notfound-code {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-size: clamp(4.5rem, 14vw, 8rem);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
}

.notfound-title {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3.5vw, 2rem);
}

.notfound-desc {
  margin: 0 0 32px;
  color: var(--text-2);
  max-width: 30em;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 999px;
  font-size: 0.92rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
  color: #fff;
  background: var(--gradient);
  box-shadow: 0 4px 16px rgba(124, 58, 237, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.35);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .masthead-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 40px;
  }

  .archive-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .archive-side {
    position: static;
    order: -1;
  }

  .tag-cloud {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .tag-btn {
    width: auto;
    padding: 4px 10px;
    font-size: 0.78rem;
    border-radius: 999px;
  }

  .tag-btn sup {
    margin-left: 6px;
  }

  .home-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .home-side {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .side-rss {
    grid-column: 1 / -1;
  }

  .post-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }
}

@media (max-width: 860px) {
  .masthead {
    padding-top: 64px;
  }

  .masthead-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .masthead-collage {
    display: none;
  }

  .featured-post {
    margin-bottom: 40px;
  }

  .featured-media {
    aspect-ratio: 16 / 7;
  }

  .featured-body {
    padding: 26px 28px 24px;
  }

  .post-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .nav-links {
    gap: 20px;
  }

  .archive-item {
    grid-template-columns: 54px minmax(0, 1fr);
  }

}

@media (max-width: 640px) {
  body {
    font-size: 15.5px;
  }

  .container {
    padding-left: 20px;
    padding-right: 20px;
  }

  .nav-links a {
    font-size: 0.86rem;
  }

  .masthead-stats {
    padding: 8px 16px;
    gap: 12px;
  }

  .masthead {
    padding-top: 48px;
  }

  .masthead-title {
    font-size: clamp(2.8rem, 14vw, 3.6rem);
  }

  .masthead-desc {
    font-size: 1rem;
  }

  .featured-post {
    border-radius: 16px;
  }

  .featured-media {
    aspect-ratio: 16 / 9;
  }

  .featured-body {
    padding: 22px 20px 20px;
  }

  .featured-title {
    font-size: 1.35rem;
  }

  .post-grid {
    grid-template-columns: 1fr;
  }

  .post-hero {
    padding: 92px 0 52px;
  }

  .post-hero-title {
    font-size: 1.65rem;
  }

  .post-layout {
    padding: 36px 20px 20px;
  }

  .post-meta {
    font-size: 0.8rem;
  }

  .post-content {
    font-size: 1.02rem;
    line-height: 1.9;
  }

  .post-pager {
    grid-template-columns: 1fr;
  }

  .home-side {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}