/* ==========================================================
   yesno.chat — 裁决式个人博客
   纸媒 + 印章。改色只改 :root。
   ========================================================== */

:root {
  --paper: #f6f3ec;
  --paper-2: #efeae0;
  --ink: #17140f;
  --ink-soft: #4a443b;
  --muted: #8b8277;
  --rule: #ddd5c7;
  --yes: #1d6b4b;
  --no: #b23a26;
  --depends: #a8710f;
  --wrap: 1080px;

  --serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", "SimSun", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

/* 极轻的纸张颗粒 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: .5;
  background-image:
    repeating-linear-gradient(0deg, rgba(0,0,0,.014) 0 1px, transparent 1px 3px),
    radial-gradient(circle at 18% 12%, rgba(180,160,130,.06), transparent 55%),
    radial-gradient(circle at 82% 78%, rgba(180,160,130,.05), transparent 50%);
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* ---------- Masthead ---------- */
.masthead {
  border-bottom: 1px solid var(--rule);
  background: rgba(246, 243, 236, .9);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 40;
}

.masthead-in {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 66px;
}

.logo {
  font-family: var(--mono);
  font-size: 16px;
  letter-spacing: -.03em;
  white-space: nowrap;
}
.logo b { font-weight: 700; }
.logo i {
  font-style: normal;
  color: var(--muted);
  font-weight: 400;
}
.logo s {
  text-decoration: none;
  color: var(--no);
}

.mast-nav {
  display: flex;
  gap: 24px;
  margin-left: auto;
  font-size: 13.5px;
  color: var(--ink-soft);
}
.mast-nav a { padding: 3px 0; border-bottom: 1px solid transparent; transition: border-color .2s, color .2s; }
.mast-nav a:hover { color: var(--ink); border-color: var(--ink); }

.mast-cta {
  font-size: 13px;
  border: 1px solid var(--ink);
  padding: 7px 14px;
  transition: background .2s, color .2s;
}
.mast-cta:hover { background: var(--ink); color: var(--paper); }

/* ---------- Hero ---------- */
.hero { padding: 76px 0 64px; border-bottom: 1px solid var(--rule); }

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr .65fr;
  gap: 64px;
  align-items: end;
}

.kicker {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 26px;
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(46px, 7.2vw, 88px);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -.02em;
}

.hero h1 em {
  font-style: normal;
  display: inline-block;
  border-bottom: 3px solid var(--no);
  line-height: 1.02;
}

.hero-sub {
  margin-top: 30px;
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 30em;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 34px;
  flex-wrap: wrap;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 14px;
  border: 1px solid var(--ink);
  transition: all .2s ease;
}
.btn-solid { background: var(--ink); color: var(--paper); }
.btn-solid:hover { background: var(--no); border-color: var(--no); }
.btn-line:hover { background: var(--ink); color: var(--paper); }

/* 开关 */
.toggle { display: flex; flex-direction: column; gap: 12px; align-items: center; }

.toggle-track {
  position: relative;
  width: 236px;
  height: 84px;
  border: 2px solid var(--ink);
  border-radius: 42px;
  background: linear-gradient(90deg, rgba(29,107,75,.14) 0 50%, rgba(178,58,38,.13) 50% 100%);
  overflow: hidden;
}

.toggle-track::after {
  content: "";
  position: absolute;
  left: 50%; top: 0; bottom: 0;
  width: 2px;
  background: var(--ink);
  opacity: .25;
  transform: translateX(-1px);
}

.knob {
  position: absolute;
  top: 7px; left: 7px;
  width: 66px; height: 66px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--ink);
  transition: transform .5s cubic-bezier(.6,-0.2,.3,1.3);
}

.toggle:hover .knob { transform: translateX(152px); }

.toggle-labels {
  display: flex;
  justify-content: space-between;
  width: 236px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--muted);
}

/* ---------- 裁决列表 ---------- */
.section { padding: 72px 0; }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 8px;
}

.section-head h2 {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -.01em;
}

.section-head .count {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  letter-spacing: .1em;
  margin-left: auto;
}

.entry {
  display: grid;
  grid-template-columns: 74px 1fr 32px;
  gap: 24px;
  padding: 30px 0;
  border-bottom: 1px solid var(--rule);
  align-items: start;
  transition: background .25s ease, padding-left .25s ease;
}

.entry:hover { background: rgba(255,255,255,.55); padding-left: 10px; }

.entry-no {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  padding-top: 7px;
  letter-spacing: .04em;
}

.entry-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  margin-bottom: 12px;
}

.entry h3 {
  font-family: var(--serif);
  font-size: clamp(21px, 2.6vw, 28px);
  font-weight: 600;
  line-height: 1.42;
  letter-spacing: -.01em;
  margin-bottom: 10px;
}

.entry p {
  font-size: 14.5px;
  color: var(--ink-soft);
  max-width: 46em;
  line-height: 1.8;
}

.entry-arrow {
  justify-self: end;
  padding-top: 6px;
  color: var(--muted);
  transition: transform .25s, color .25s;
}
.entry:hover .entry-arrow { transform: translateX(5px); color: var(--no); }

/* 裁决章 */
.stamp {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  padding: 2px 8px;
  border: 1.5px solid currentColor;
  white-space: nowrap;
  line-height: 1.5;
}
.stamp-yes { color: var(--yes); }
.stamp-no { color: var(--no); }
.stamp-depends { color: var(--depends); }

/* ---------- 关于条 ---------- */
.about-strip {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--paper-2);
  padding: 64px 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 56px;
}

.about-grid h2 {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 8px;
}

.about-body p { font-size: 16px; color: var(--ink-soft); margin-bottom: 16px; max-width: 40em; }
.about-body p:last-child { margin-bottom: 0; }
.about-body strong { color: var(--ink); font-weight: 600; }

/* ---------- 订阅 ---------- */
.subscribe { padding: 72px 0; }
.subscribe-in {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
  border: 1px solid var(--ink);
  padding: 40px 44px;
}
.subscribe h2 {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 8px;
}
.subscribe p { font-size: 14.5px; color: var(--ink-soft); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--rule);
  padding: 48px 0 0;
  overflow: hidden;
}

.footer-top {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  font-size: 13px;
  color: var(--muted);
}

.footer-nav { display: flex; gap: 20px; }
.footer-nav a:hover { color: var(--ink); }

.footer-wordmark {
  display: block;
  font-family: var(--mono);
  font-size: clamp(40px, 8.2vw, 118px);
  line-height: 1.06;
  letter-spacing: -.045em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(23,20,15,.16);
  text-align: center;
  margin-top: 22px;
  margin-bottom: 0;
  padding-bottom: 10px;
  user-select: none;
}

/* ==========================================================
   文章页
   ========================================================== */

.post-wrap { max-width: 720px; }

.post-head { padding: 64px 0 36px; border-bottom: 1px solid var(--rule); }

.post-kicker {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--muted);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.post-head h1 {
  font-family: var(--serif);
  font-size: clamp(32px, 5vw, 50px);
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: -.015em;
}

.post-dek {
  margin-top: 20px;
  font-size: 17px;
  color: var(--ink-soft);
  line-height: 1.85;
}

.post-meta {
  margin-top: 26px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  letter-spacing: .04em;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

/* 结论框 */
.verdict {
  margin: 40px 0 44px;
  border: 1px solid var(--ink);
  border-left: 5px solid var(--no);
  padding: 26px 30px;
  background: rgba(255,255,255,.5);
}
.verdict.yes { border-left-color: var(--yes); }
.verdict.depends { border-left-color: var(--depends); }

.verdict-label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin-bottom: 10px;
}

.verdict p { font-size: 16.5px; line-height: 1.85; color: var(--ink); }

/* 正文 */
.prose { font-size: 17.5px; line-height: 1.95; color: var(--ink); padding-bottom: 24px; }

.prose p { margin: 0 0 26px; }

.prose h2 {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.4;
  margin: 56px 0 20px;
  padding-top: 22px;
  border-top: 1px solid var(--rule);
  letter-spacing: -.01em;
}

.prose h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }

.prose strong { font-weight: 600; }

.prose a {
  border-bottom: 1px solid var(--no);
  color: var(--no);
}

.prose ul, .prose ol { margin: 0 0 26px; padding-left: 22px; }
.prose ul li { list-style: none; position: relative; margin-bottom: 12px; }
.prose ul li::before {
  content: "—";
  position: absolute;
  left: -22px;
  color: var(--muted);
}
.prose ol { list-style: decimal; }
.prose ol li { margin-bottom: 12px; padding-left: 4px; }

.pull {
  margin: 44px 0;
  padding: 6px 0 6px 28px;
  border-left: 2px solid var(--no);
  font-family: var(--serif);
  font-size: 23px;
  line-height: 1.6;
  color: var(--ink);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  font-size: 14.5px;
}
.data-table th {
  text-align: left;
  font-weight: 600;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0 12px 10px 0;
  border-bottom: 1.5px solid var(--ink);
}
.data-table td {
  padding: 13px 12px 13px 0;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
.data-table td:first-child { font-weight: 600; white-space: nowrap; }

.note {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.8;
  margin-top: -14px;
}

/* 文末 */
.post-end {
  margin-top: 20px;
  padding-top: 28px;
  border-top: 2px solid var(--ink);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--rule);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin: 56px 0 0;
}
.post-nav a {
  background: var(--paper);
  padding: 30px 28px;
  transition: background .2s;
}
.post-nav a:hover { background: var(--paper-2); }
.post-nav span {
  display: block;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--muted);
  margin-bottom: 8px;
}
.post-nav strong { font-family: var(--serif); font-size: 17px; font-weight: 600; line-height: 1.5; }
.post-nav .next { text-align: right; }

/* ---------- About 页 ---------- */
.about-hero { padding-top: 72px; padding-bottom: 40px; }
.about-hero h1 {
  font-family: var(--serif);
  font-size: clamp(36px, 5.6vw, 62px);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: -.02em;
}
.about-hero p { margin-top: 24px; font-size: 17.5px; color: var(--ink-soft); max-width: 34em; }

.faq { border-top: 1px solid var(--rule); margin-top: 24px; }
.faq-item { padding: 28px 0; border-bottom: 1px solid var(--rule); display: grid; grid-template-columns: 280px 1fr; gap: 36px; }
.faq-item h3 { font-family: var(--serif); font-size: 19px; font-weight: 600; line-height: 1.5; }
.faq-item p { font-size: 15.5px; color: var(--ink-soft); }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; align-items: start; }
  .toggle { align-items: flex-start; }
  .about-grid { grid-template-columns: 1fr; gap: 20px; }
  .faq-item { grid-template-columns: 1fr; gap: 10px; }
  .subscribe-in { grid-template-columns: 1fr; padding: 32px 28px; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav .next { text-align: left; }
}

@media (max-width: 720px) {
  .mast-nav { display: none; }
  .entry { grid-template-columns: 1fr; gap: 10px; padding: 26px 0; }
  .entry-no { padding-top: 0; }
  .entry-arrow { display: none; }
  .wrap { padding: 0 20px; }
  .hero { padding: 52px 0 44px; }
  .section { padding: 52px 0; }
  .prose { font-size: 16.5px; }
  .pull { font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* ==========================================================
   刊头信息条（v2）
   ========================================================== */

.issue-bar {
  background: var(--paper-2);
  border-bottom: 1px solid var(--rule);
}

.issue-in {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  height: 34px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
}

.issue-in .dot { opacity: .45; }

.issue-link {
  margin-left: auto;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule);
  transition: color .2s, border-color .2s;
}
.issue-link:hover { color: var(--no); border-color: var(--no); }

/* 条目计数 / 更多链接 */
.count a { border-bottom: 1px solid transparent; }
.count a:hover { color: var(--no); border-bottom-color: var(--no); }

/* 裁决章悬停微动 */
.stamp { transition: transform .25s ease; }
.entry:hover .stamp { transform: scale(1.06); }

/* ==========================================================
   归档页（v2）
   ========================================================== */

.archive-head {
  padding: 64px 0 26px;
  border-bottom: 2px solid var(--ink);
}

.archive-head h1 {
  font-family: var(--serif);
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -.015em;
}

.archive-head p {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--muted);
}

.arch-group { margin-top: 48px; }

.arch-group-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 4px;
}

.arch-group-head h2 {
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: .16em;
  color: var(--muted);
}

.arch-group-head span {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
}

.arch-row {
  display: grid;
  grid-template-columns: 62px 86px 1fr auto;
  gap: 18px;
  align-items: baseline;
  padding: 17px 0;
  border-bottom: 1px solid var(--rule);
  transition: background .2s ease, padding-left .2s ease;
}

.arch-row:hover { background: rgba(255,255,255,.5); padding-left: 8px; }

.arch-no,
.arch-date {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  letter-spacing: .03em;
}

.arch-title {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.55;
  letter-spacing: -.005em;
}

.arch-row:hover .arch-title { color: var(--no); }

/* 卷号 */
.vol {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  color: var(--muted);
}

@media (max-width: 720px) {
  .arch-row { grid-template-columns: 1fr auto; gap: 6px 14px; }
  .arch-no { display: none; }
  .arch-date { grid-column: 1; }
  .arch-title { grid-column: 1 / -1; font-size: 16.5px; }
  .arch-row .stamp { grid-row: 1; grid-column: 2; justify-self: end; }
  .issue-in { height: auto; padding: 8px 0; }
}

/* 次级文字链接（替代第二个按钮） */
.text-link {
  font-size: 13.5px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2px;
  transition: color .2s, border-color .2s;
}
.text-link:hover { color: var(--no); border-color: var(--no); }
/* ==========================================================
   Motion layer（v3）
   只动 transform / opacity，避免重排
   ========================================================== */

/* 阅读进度 */
.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--no);
  transform: scaleX(0);
  transform-origin: 0 50%;
  z-index: 60;
  pointer-events: none;
  mix-blend-mode: multiply;
}

/* 光标柔光 */
.spotlight {
  position: fixed;
  top: 0; left: 0;
  width: 620px; height: 620px;
  margin: -310px 0 0 -310px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(178,58,38,.085), rgba(178,58,38,0) 62%);
  pointer-events: none;
  z-index: 0;
  will-change: transform;
}

/* 滚动揭示 */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity .75s cubic-bezier(.16,1,.3,1),
    transform .75s cubic-bezier(.16,1,.3,1);
  transition-delay: var(--d, 0ms);
}
[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* 标题逐字 */
.ch {
  display: inline-block;
  vertical-align: bottom;
  line-height: 1.16;
  padding-bottom: .18em;
  margin-bottom: -.18em;
}
.ch-in {
  display: inline-block;
  opacity: 0;
  transform: translateY(.34em);
  transition:
    opacity .55s cubic-bezier(.16,1,.3,1),
    transform .85s cubic-bezier(.16,1,.3,1);
}
.hero h1.is-in .ch-in,
.about-hero h1.is-in .ch-in {
  opacity: 1;
  transform: none;
}
.w {
  display: inline-block;
  vertical-align: bottom;
  padding-bottom: .18em;
  margin-bottom: -.18em;
}
.w > * {
  display: inline-block;
  opacity: 0;
  transform: translateY(.34em);
  transition:
    opacity .55s cubic-bezier(.16,1,.3,1),
    transform .85s cubic-bezier(.16,1,.3,1);
  transition-delay: inherit;
}
.hero h1.is-in .w > *,
.about-hero h1.is-in .w > * {
  opacity: 1;
  transform: none;
}

/* 印章落下 */
@keyframes stamp-drop {
  0%   { opacity: 0; transform: scale(1.42); }
  55%  { opacity: 1; transform: scale(.96); }
  75%  { transform: scale(1.02); }
  100% { opacity: 1; transform: scale(1); }
}
.stamp-in { animation: stamp-drop .62s cubic-bezier(.22,1,.36,1); }

/* 触摸设备：去掉悬停残留 */
@media (hover: none) {
  .entry:hover { background: none; padding-left: 0; }
  .entry:hover .entry-no { color: var(--muted); transform: none; }
  .entry:hover .entry-arrow { transform: none; color: var(--muted); }
  .entry:hover .stamp { transform: none; }
  .arch-row:hover { background: none; padding-left: 0; }
  .arch-row:hover .arch-title { color: inherit; }
  .toggle:hover .knob { transform: none; }
}

/* 开关自动演示 */
.toggle .knob { will-change: transform; }
.toggle.is-on .knob { transform: translateX(152px); }

/* 返回顶部 */
.to-top {
  position: fixed;
  right: 26px; bottom: 26px;
  width: 46px; height: 46px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 50%;
  background: var(--paper);
  font-family: var(--mono);
  font-size: 15px;
  color: var(--ink);
  opacity: 0;
  transform: translateY(14px) scale(.9);
  pointer-events: none;
  transition: opacity .35s ease, transform .35s cubic-bezier(.16,1,.3,1), background .2s, color .2s;
  z-index: 50;
}
.to-top.is-on { opacity: 1; transform: none; pointer-events: auto; }
.to-top:hover { background: var(--ink); color: var(--paper); }

/* 磁吸按钮 */
.btn, .mast-cta {
  will-change: transform;
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .25s ease;
}

/* 条目细节 */
.entry-no { transition: color .25s ease, transform .25s ease; }
.entry:hover .entry-no { color: var(--no); transform: translateX(-3px); }
.entry-arrow, .arch-title { will-change: transform; }

/* 归档行入场 */
.arch-row { will-change: transform; }

/* 页面转场（支持 View Transitions 的浏览器） */
@view-transition { navigation: auto; }

::view-transition-old(root) {
  animation: vt-out .2s cubic-bezier(.4,0,1,1) both;
}
::view-transition-new(root) {
  animation: vt-in .34s cubic-bezier(.16,1,.3,1) both;
}
@keyframes vt-out {
  to { opacity: 0; transform: translateY(-8px); }
}
@keyframes vt-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}

/* 破折号分隔线呼吸（关于条） */
.about-strip .about-body p {
  transition: opacity .7s cubic-bezier(.16,1,.3,1), transform .7s cubic-bezier(.16,1,.3,1);
}

/* 移动端关掉光标柔光与磁吸 */
@media (max-width: 960px) {
  .spotlight { display: none; }
}

/* 尊重系统设置 */
@media (prefers-reduced-motion: reduce) {
  .scroll-progress, .spotlight, .to-top { display: none; }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .ch-in, .w > * { transform: none !important; }
}

/* ==========================================================
   教程栏目（v4）
   ========================================================== */

.lesson {
  display: grid;
  grid-template-columns: 54px 1fr auto;
  gap: 20px;
  align-items: baseline;
  padding: 21px 0;
  border-bottom: 1px solid var(--rule);
  transition: background .22s ease, padding-left .22s ease;
}

.lesson:hover {
  background: rgba(255,255,255,.5);
  padding-left: 8px;
}

.lesson-no {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  letter-spacing: .05em;
}

.lesson-main h3 {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: -.005em;
  transition: color .2s;
}

.lesson:hover .lesson-main h3 { color: var(--no); }

.lesson-main p {
  font-size: 13.5px;
  color: var(--muted);
  margin-top: 5px;
  line-height: 1.7;
}

.status {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .12em;
  padding: 2px 7px;
  border: 1px solid currentColor;
  white-space: nowrap;
  align-self: center;
}

.status-live { color: var(--yes); }
.status-soon { color: var(--muted); border-color: var(--line); }

.lesson-soon { opacity: .55; }
.lesson-soon:hover { background: none; padding-left: 0; }
.lesson-soon:hover .lesson-main h3 { color: inherit; }

/* 练习框 */
.exercise {
  margin: 44px 0 8px;
  padding: 24px 28px;
  border: 1px dashed var(--line);
  background: rgba(255,255,255,.45);
}

.exercise h3 {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--no);
  margin-bottom: 12px;
}

.exercise p {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0;
}

@media (max-width: 720px) {
  .lesson { grid-template-columns: 1fr auto; gap: 6px 14px; }
  .lesson-no { display: none; }
  .lesson-main h3 { font-size: 17px; }
  .status { align-self: start; margin-top: 3px; }
  .exercise { padding: 20px 20px; }
}

/* 备案号 */
.icp {
  font-size: 12px;
  color: var(--muted);
  border-bottom: 1px dotted var(--rule);
  transition: color .2s, border-color .2s;
}
.icp:hover { color: var(--ink); border-color: var(--ink); }