@import url('https://fonts.googleapis.com/css2?family=Crimson+Text:wght@400;600;700&family=EB+Garamond:wght@400;500;600;700;800&display=swap');

/* ===== CSS 自定义属性 ===== */
:root {
  --c-red: #ff0000;
  --c-pink: #ff1493;
  --c-dark: #261717;
  --c-dark2: #1a0f0f;
  --c-dark3: #300e0e;
  --c-surface: #2e1a1a;
  --c-surface2: #3a1f1f;
  --c-text: #f5e8e8;
  --c-text-muted: #c4a0a0;
  --c-text-dim: #8a5f5f;
  --c-border: rgba(255,20,147,0.2);
  --c-border-bright: rgba(255,0,0,0.4);
  --c-glow-red: rgba(255,0,0,0.35);
  --c-glow-pink: rgba(255,20,147,0.35);

  --font-serif: 'EB Garamond', 'Crimson Text', Georgia, 'Times New Roman', serif;
  --font-ui: 'Crimson Text', 'EB Garamond', Georgia, serif;

  --nav-h: 68px;
  --anchor-h: 44px;
  --radius: 0px;
  --shadow-card: 0 4px 24px rgba(255,0,0,0.12), 0 1px 6px rgba(255,20,147,0.10);
  --shadow-card-hover: 0 8px 40px rgba(255,0,0,0.22), 0 2px 12px rgba(255,20,147,0.18);
  --transition-base: 0.28s ease;
}

/* ===== 全局重置 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 17px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-serif);
  background-color: var(--c-dark);
  color: var(--c-text);
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

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

a {
  color: var(--c-pink);
  text-decoration: none;
  transition: color var(--transition-base), opacity var(--transition-base);
}

a:hover {
  color: var(--c-red);
  opacity: 0.9;
}

a:focus-visible {
  outline: 2px solid var(--c-pink);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ===== 极光背景层 ===== */
.aurora-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.aurora-layer {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  mix-blend-mode: screen;
}

.aurora-1 {
  width: 80vw;
  height: 60vh;
  top: -20vh;
  left: -10vw;
  background: radial-gradient(ellipse at center, rgba(255,0,0,0.6) 0%, rgba(255,20,147,0.4) 45%, transparent 75%);
  animation: aurora-drift-1 10s ease-in-out infinite alternate;
}

.aurora-2 {
  width: 70vw;
  height: 55vh;
  top: 10vh;
  right: -15vw;
  background: radial-gradient(ellipse at center, rgba(255,20,147,0.5) 0%, rgba(255,0,0,0.3) 50%, transparent 75%);
  animation: aurora-drift-2 12s ease-in-out infinite alternate;
}

.aurora-3 {
  width: 60vw;
  height: 40vh;
  bottom: 5vh;
  left: 20vw;
  background: conic-gradient(from 180deg at 50% 50%, rgba(255,0,0,0.3), rgba(255,20,147,0.4), rgba(255,0,0,0.2), transparent);
  animation: aurora-drift-3 9s ease-in-out infinite alternate;
}

.aurora-dim .aurora-layer {
  opacity: 0.3;
}

.aurora-minimal .aurora-layer {
  opacity: 0.15;
}

@keyframes aurora-drift-1 {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(8vw, 6vh) scale(1.12); }
}

@keyframes aurora-drift-2 {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(-6vw, 8vh) scale(1.08); }
}

@keyframes aurora-drift-3 {
  0%   { transform: translate(0, 0) rotate(0deg) scale(1); }
  100% { transform: translate(4vw, -5vh) rotate(15deg) scale(1.1); }
}

@media (prefers-reduced-motion: reduce) {
  .aurora-layer { animation: none; }
}

/* ===== 主内容层级 ===== */
.site-header,
.anchor-bar,
main,
footer.site-footer {
  position: relative;
  z-index: 1;
}

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  height: var(--nav-h);
  background: rgba(38,23,23,0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--c-border);
  z-index: 100;
}

.site-nav {
  max-width: 1280px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 0 1.5rem;
}

.site-nav > a {
  font-family: var(--font-ui);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-text-muted);
  padding: 0 0.9rem;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  white-space: nowrap;
  letter-spacing: 0.02em;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-base), border-color var(--transition-base);
  min-height: 44px;
}

.site-nav > a:hover,
.site-nav > a[aria-current="page"] {
  color: var(--c-text);
  border-bottom-color: var(--c-pink);
}

.site-nav > .brand-center {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 1.2rem;
  padding: 0 1rem;
  color: var(--c-text);
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-bottom: none;
  flex-shrink: 0;
}

.site-nav > .brand-center:hover {
  color: var(--c-pink);
  border-bottom: none;
}

.brand-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.brand-name {
  background: linear-gradient(90deg, var(--c-red), var(--c-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== 二级粘性锚点条 ===== */
.anchor-bar {
  position: sticky;
  top: var(--nav-h);
  z-index: 90;
  background: rgba(30,16,16,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  height: var(--anchor-h);
  overflow-x: auto;
  scrollbar-width: none;
}

.anchor-bar::-webkit-scrollbar { display: none; }

.anchor-inner {
  max-width: 1280px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0 1.5rem;
}

.anchor-link {
  font-size: 0.85rem;
  font-family: var(--font-ui);
  font-weight: 600;
  color: var(--c-text-dim);
  padding: 0 0.85rem;
  height: var(--anchor-h);
  display: flex;
  align-items: center;
  white-space: nowrap;
  border-right: 1px solid var(--c-border);
  transition: color var(--transition-base);
  min-height: 44px;
}

.anchor-link:last-child { border-right: none; }

.anchor-link:hover { color: var(--c-pink); }

/* ===== 布局容器 ===== */
.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== 首页 Hero ===== */
.hero-section {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 560px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-mask {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    160deg,
    rgba(38,23,23,0.72) 0%,
    rgba(38,23,23,0.45) 40%,
    rgba(38,23,23,0.82) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 780px;
  padding: 2rem 1.5rem;
}

.hero-h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: 0.02em;
  color: #fff;
  text-shadow: 0 2px 32px rgba(255,0,0,0.5), 0 1px 8px rgba(0,0,0,0.6);
  margin-bottom: 1.2rem;
}

.hero-desc {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: rgba(245,232,232,0.85);
  max-width: 580px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 2.4rem;
  background: linear-gradient(90deg, var(--c-red), var(--c-pink));
  color: #fff;
  font-family: var(--font-ui);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border: none;
  cursor: pointer;
  min-height: 44px;
  box-shadow: 0 4px 24px rgba(255,0,0,0.4);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.hero-btn:hover {
  color: #fff;
  box-shadow: 0 8px 40px rgba(255,0,0,0.6);
  transform: translateY(-2px);
}

/* ===== 眉题（eyebrow） ===== */
.eyebrow {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-pink);
  margin-bottom: 0.55rem;
  border-left: 3px solid var(--c-red);
  padding-left: 0.6rem;
}

/* ===== 正文区块标题 ===== */
h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--c-text);
  line-height: 1.28;
  margin-bottom: 1.4rem;
}

h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 0.8rem;
}

/* ===== 首页内容区 ===== */
.home-content-section {
  padding: 4rem 0 2rem;
}

.topic-grid-section {
  padding: 2rem 0 4rem;
}

/* ===== 卡片网格 ===== */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  list-style: none;
  margin-top: 1.5rem;
}

.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
  border-color: var(--c-border-bright);
}

.card > a {
  display: flex;
  flex-direction: column;
  color: var(--c-text);
  height: 100%;
}

.card-media {
  overflow: hidden;
  aspect-ratio: 16/9;
}

.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.card:hover .card-img {
  transform: scale(1.04);
}

.card-body {
  padding: 1.2rem 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-text);
}

.card-desc {
  font-size: 0.88rem;
  color: var(--c-text-muted);
  line-height: 1.55;
}

/* ===== 栏目页 Hero ===== */
.topic-hero {
  position: relative;
  padding: 5rem 1.5rem 3.5rem;
  text-align: center;
  background: linear-gradient(180deg, rgba(255,0,0,0.08) 0%, transparent 100%);
  border-bottom: 1px solid var(--c-border);
}

.topic-hero-inner {
  max-width: 700px;
  margin: 0 auto;
}

.topic-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--c-text);
  margin-bottom: 1rem;
}

.topic-desc {
  font-size: 1.05rem;
  color: var(--c-text-muted);
  line-height: 1.7;
}

/* ===== 栏目页内容 ===== */
.topic-prose-section {
  padding: 3rem 0 2rem;
}

.topic-children-section {
  padding: 1.5rem 0 4rem;
}

/* ===== 子页列表 ===== */
.child-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
  counter-reset: child-counter;
}

.child-item {
  counter-increment: child-counter;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
  position: relative;
}

.child-item::before {
  content: counter(child-counter, decimal-leading-zero);
  position: absolute;
  top: 1.1rem;
  left: 1.2rem;
  font-family: var(--font-serif);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--c-red);
  letter-spacing: 0.06em;
  z-index: 1;
}

.child-item:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--c-border-bright);
  transform: translateX(4px);
}

.child-item > a {
  display: flex;
  align-items: stretch;
  color: var(--c-text);
  gap: 1rem;
}

.child-media {
  flex-shrink: 0;
  width: 160px;
  overflow: hidden;
}

.child-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 100px;
}

.child-info {
  flex: 1;
  padding: 1.1rem 1.2rem 1.1rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  justify-content: center;
}

.child-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.38;
  color: var(--c-text);
}

.child-desc {
  font-size: 0.88rem;
  color: var(--c-text-muted);
  line-height: 1.5;
}

.child-date {
  font-size: 0.8rem;
  color: var(--c-text-dim);
}

.child-date time {
  color: inherit;
}

/* ===== 文章页 ===== */
.article-section {
  padding: 2.5rem 0 4rem;
}

.article-main {
  max-width: 760px;
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.83rem;
  color: var(--c-text-dim);
  margin-bottom: 2rem;
}

.breadcrumb a {
  color: var(--c-text-dim);
}

.breadcrumb a:hover {
  color: var(--c-pink);
}

.article-hero-wrap {
  margin-bottom: 1.8rem;
  overflow: hidden;
  aspect-ratio: 16/7;
}

.article-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.pub-date,
.mod-date {
  font-size: 0.82rem;
  color: var(--c-text-dim);
}

.cat-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  font-family: var(--font-ui);
  color: var(--c-pink);
  border: 1px solid var(--c-pink);
  padding: 0.2rem 0.7rem;
  letter-spacing: 0.04em;
  transition: background var(--transition-base), color var(--transition-base);
}

.cat-tag:hover {
  background: var(--c-pink);
  color: #fff;
}

.article-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.22;
  color: var(--c-text);
  margin-bottom: 1rem;
}

.article-lead {
  font-size: 1.08rem;
  color: var(--c-text-muted);
  line-height: 1.7;
  margin-bottom: 2rem;
  border-left: 3px solid var(--c-red);
  padding-left: 1rem;
}

/* ===== 相关文章 ===== */
.related-aside {
  margin-top: 3rem;
  padding: 2rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-top: 3px solid var(--c-red);
}

.related-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 1rem;
}

.related-list li > a {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.6rem 0.8rem;
  color: var(--c-text);
  border-left: 2px solid transparent;
  transition: border-color var(--transition-base), background var(--transition-base);
}

.related-list li > a:hover {
  border-left-color: var(--c-pink);
  background: rgba(255,20,147,0.05);
}

.related-list li > a strong {
  font-size: 0.96rem;
  font-weight: 600;
}

.related-list li > a small {
  font-size: 0.82rem;
  color: var(--c-text-muted);
}

/* ===== 关于页 ===== */
.about-hero {
  padding: 5rem 1.5rem 3rem;
  text-align: center;
  background: linear-gradient(180deg, rgba(255,20,147,0.07) 0%, transparent 100%);
  border-bottom: 1px solid var(--c-border);
}

.about-hero-inner {
  max-width: 680px;
  margin: 0 auto;
}

.about-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.22;
  color: var(--c-text);
  margin-bottom: 1rem;
}

.about-lead {
  font-size: 1.05rem;
  color: var(--c-text-muted);
  line-height: 1.7;
}

.about-section {
  padding: 3rem 0 2rem;
}

.about-nav-section {
  padding: 1.5rem 0 4rem;
}

.about-nav-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.2rem;
  margin-top: 1.4rem;
}

.about-nav-item {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

.about-nav-item:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--c-border-bright);
  transform: translateY(-2px);
}

.about-nav-item > a {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.2rem 1.4rem;
  color: var(--c-text);
}

.about-nav-item > a strong {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-text);
}

.about-nav-item > a small {
  font-size: 0.85rem;
  color: var(--c-text-muted);
  line-height: 1.5;
}

/* ===== 隐私页 ===== */
.privacy-section {
  padding: 3rem 0 4rem;
  max-width: 760px;
  margin: 0 auto;
}

.privacy-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--c-border);
}

.privacy-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 800;
  color: var(--c-text);
  margin-bottom: 0.8rem;
}

.privacy-date {
  font-size: 0.85rem;
  color: var(--c-text-dim);
  margin-bottom: 0.8rem;
}

.privacy-lead {
  font-size: 1.02rem;
  color: var(--c-text-muted);
  line-height: 1.7;
}

.privacy-content {
  margin-bottom: 2rem;
}

.privacy-links {
  margin-top: 2.5rem;
  padding: 1.2rem 1.5rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-pink);
  font-size: 0.92rem;
  color: var(--c-text-muted);
}

/* ===== Prose 正文样式 ===== */
.prose {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--c-text);
}

.prose h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.prose h3 {
  margin-top: 1.8rem;
  margin-bottom: 0.7rem;
}

.prose p {
  margin-bottom: 1.2rem;
}

.prose ul,
.prose ol {
  margin: 1rem 0 1.2rem 1.5rem;
}

.prose li {
  margin-bottom: 0.4rem;
}

.prose a {
  color: var(--c-pink);
  border-bottom: 1px solid rgba(255,20,147,0.35);
  transition: border-color var(--transition-base), color var(--transition-base);
}

.prose a:hover {
  color: var(--c-red);
  border-bottom-color: var(--c-red);
}

.prose blockquote {
  border-left: 3px solid var(--c-red);
  padding-left: 1.2rem;
  margin: 1.5rem 0;
  color: var(--c-text-muted);
  font-style: italic;
}

.prose code {
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
  background: rgba(255,20,147,0.12);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

.prose pre {
  background: var(--c-dark2);
  border: 1px solid var(--c-border);
  padding: 1.2rem 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.prose pre code {
  background: none;
  padding: 0;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: 2rem 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.prose th,
.prose td {
  padding: 0.65rem 1rem;
  border: 1px solid var(--c-border);
  text-align: left;
}

.prose th {
  background: var(--c-surface2);
  color: var(--c-text);
  font-weight: 700;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--c-dark2);
  border-top: 1px solid var(--c-border);
  margin-top: auto;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 2rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.footer-col dt {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-red);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--c-border);
}

.footer-col dd {
  margin: 0 0 0.5rem;
}

.footer-col dd a {
  font-size: 0.9rem;
  color: var(--c-text-muted);
  transition: color var(--transition-base);
  display: inline-block;
  min-height: 28px;
  line-height: 1.5;
}

.footer-col dd a:hover {
  color: var(--c-pink);
}

.footer-about {
  font-size: 0.88rem;
  color: var(--c-text-dim);
  line-height: 1.6;
  margin-bottom: 0.8rem;
}

.footer-bottom {
  border-top: 1px solid var(--c-border);
  padding: 1.2rem 1.5rem;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: var(--c-text-dim);
  line-height: 1.55;
}

/* ===== 动效：Stagger List ===== */
.stagger-list .stagger-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger-list.is-visible .stagger-item {
  opacity: 1;
  transform: translateY(0);
}

.stagger-list.is-visible .stagger-item:nth-child(1)  { transition-delay: 0.05s; }
.stagger-list.is-visible .stagger-item:nth-child(2)  { transition-delay: 0.10s; }
.stagger-list.is-visible .stagger-item:nth-child(3)  { transition-delay: 0.15s; }
.stagger-list.is-visible .stagger-item:nth-child(4)  { transition-delay: 0.20s; }
.stagger-list.is-visible .stagger-item:nth-child(5)  { transition-delay: 0.25s; }
.stagger-list.is-visible .stagger-item:nth-child(6)  { transition-delay: 0.30s; }
.stagger-list.is-visible .stagger-item:nth-child(7)  { transition-delay: 0.35s; }
.stagger-list.is-visible .stagger-item:nth-child(8)  { transition-delay: 0.40s; }

@media (prefers-reduced-motion: reduce) {
  .stagger-list .stagger-item {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ===== 空提示 ===== */
.empty-note {
  color: var(--c-text-dim);
  font-size: 0.95rem;
  padding: 2rem 0;
}

/* ===== 响应式断点 ===== */
@media (max-width: 900px) {
  .site-nav {
    gap: 0;
    overflow-x: auto;
    scrollbar-width: none;
    justify-content: flex-start;
  }
  .site-nav::-webkit-scrollbar { display: none; }

  .site-nav > .brand-center {
    margin: 0 0.5rem;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }

  .footer-col.footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  :root {
    --nav-h: 60px;
  }

  html { font-size: 16px; }

  .site-nav > a {
    font-size: 0.88rem;
    padding: 0 0.65rem;
  }

  .site-nav > .brand-center {
    font-size: 1rem;
  }

  .hero-h1 {
    font-size: 2rem;
  }

  .hero-btn {
    padding: 0.75rem 1.8rem;
    font-size: 0.95rem;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 2rem 1.2rem 1.5rem;
  }

  .child-media {
    width: 110px;
  }

  .child-info {
    padding-left: 2.8rem;
  }

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

  .about-nav-list {
    grid-template-columns: 1fr;
  }

  .related-aside {
    padding: 1.3rem;
  }

  .wrap {
    padding: 0 1rem;
  }

  .privacy-section {
    padding: 2rem 0 3rem;
  }
}

@media (max-width: 420px) {
  .child-item > a {
    flex-direction: column;
  }
  .child-media {
    width: 100%;
  }
  .child-img {
    min-height: 160px;
  }
  .child-info {
    padding-left: 1.2rem;
    padding-top: 2.6rem;
  }
  .child-item::before {
    top: 0.8rem;
  }
}