/* ===== 字体引入 ===== */
@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Source+Sans+3:wght@300;400;500;600;700&display=swap');

/* ===== CSS 变量 ===== */
:root {
  --c-black: #000000;
  --c-surface: #121212;
  --c-surface2: #1a1a1a;
  --c-surface3: #222222;
  --c-border: #2a2a2a;
  --c-text: #e8e8e8;
  --c-text-muted: #888888;
  --c-text-dim: #555555;
  --c-accent: #4a6cf7;
  --c-accent2: #7b4fff;
  --c-accent-gold: #c9a84c;
  --c-accent-glow: rgba(74, 108, 247, 0.25);
  --c-white: #ffffff;
  --radius-card: 18px;
  --radius-sm: 8px;
  --radius-pill: 100px;
  --font-display: 'Bebas Neue', Impact, 'Arial Black', sans-serif;
  --font-body: 'Source Sans 3', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --nav-h: 64px;
  --brand-bar-h: 52px;
  --transition: 0.2s ease;
}

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

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  font-size: 18px;
}

body {
  background: var(--c-black);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--c-white);
}

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

ul { list-style: none; }

/* ===== 站点容器 ===== */
.site-wrapper {
  min-height: 100vh;
  padding-bottom: var(--nav-h);
}

/* ===== 品牌条 ===== */
.brand-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  height: var(--brand-bar-h);
  display: flex;
  align-items: center;
  padding: 0 1.25rem;
  gap: 1rem;
  border-bottom: 1px solid var(--c-border);
}

.brand-bar__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--c-white);
  letter-spacing: 0.04em;
  text-shadow: 0 0 10px rgba(74, 108, 247, 0.6);
  white-space: nowrap;
}

.brand-bar__logo:hover {
  color: var(--c-white);
  text-shadow: 0 0 20px rgba(74, 108, 247, 0.9);
}

.brand-bar__tagline {
  font-size: 0.72rem;
  color: var(--c-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ===== 底部固定导航（aside > nav > ul > li > a）===== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--c-border);
  height: var(--nav-h);
}

.bottom-nav nav {
  height: 100%;
}

.bottom-nav ul {
  display: flex;
  height: 100%;
  align-items: stretch;
  justify-content: space-around;
}

.bottom-nav li {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.bottom-nav__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: 100%;
  height: 100%;
  min-height: 44px;
  padding: 6px 4px;
  color: var(--c-text-muted);
  font-family: var(--font-body);
  text-decoration: none;
  transition: color var(--transition);
}

.bottom-nav__link:hover,
.bottom-nav__link--active {
  color: var(--c-accent);
}

.bottom-nav__link--active .bottom-nav__icon {
  text-shadow: 0 0 10px var(--c-accent);
}

.bottom-nav__icon {
  font-family: var(--font-display);
  font-size: 1.1rem;
  line-height: 1;
}

.bottom-nav__label {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  align-items: center;
  font-size: 0.78rem;
  color: var(--c-text-muted);
  margin-bottom: 1rem;
}

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

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

/* ===== 通用 Section Header ===== */
.section-header {
  padding: 2.5rem 1.25rem 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}

.section-header__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  color: var(--c-white);
  letter-spacing: 0.04em;
}

.section-header__sub {
  font-size: 0.9rem;
  color: var(--c-text-muted);
  margin-top: 0.35rem;
}

/* ===== Hero（首页）===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding-top: var(--brand-bar-h);
}

.hero__inner {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 3rem 1.25rem 4rem;
  min-height: calc(100vh - var(--brand-bar-h));
}

.hero__bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    160deg,
    rgba(0,0,0,0.3) 0%,
    rgba(0,0,0,0.6) 40%,
    rgba(0,0,0,0.9) 80%,
    #000 100%
  );
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 680px;
}

.hero__bg-text {
  position: absolute;
  right: -0.05em;
  bottom: 3rem;
  font-family: var(--font-display);
  font-size: clamp(6rem, 20vw, 14rem);
  color: rgba(255, 255, 255, 0.04);
  letter-spacing: -0.02em;
  pointer-events: none;
  user-select: none;
  line-height: 1;
  z-index: 1;
}

.hero__eyebrow {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--c-accent);
  margin-bottom: 0.75rem;
  text-shadow: 0 0 10px var(--c-accent-glow);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 10vw, 6rem);
  line-height: 0.95;
  letter-spacing: 0.02em;
  color: var(--c-white);
  margin-bottom: 1rem;
  text-shadow: 0 2px 30px rgba(0,0,0,0.8);
  transform: skewX(-2deg);
}

.hero__sub {
  font-size: 1rem;
  color: var(--c-text);
  max-width: 480px;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.hero__btn {
  display: inline-block;
  background: var(--c-accent);
  color: var(--c-white);
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  padding: 0.75rem 2.25rem;
  border-radius: var(--radius-pill);
  min-height: 48px;
  line-height: 1.4;
  transition: background var(--transition), box-shadow var(--transition);
  box-shadow: 0 0 20px rgba(74, 108, 247, 0.4);
}

.hero__btn:hover {
  background: var(--c-accent2);
  color: var(--c-white);
  box-shadow: 0 0 30px rgba(123, 79, 255, 0.6);
}

.hero__clip {
  height: 60px;
  background: var(--c-black);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  margin-top: -60px;
  position: relative;
  z-index: 3;
}

/* ===== 正文容器（article > section > div）===== */
.page-article {
  padding: 0 1.25rem;
  max-width: 780px;
  margin: 0 auto;
}

.content-section {
  padding: 2.5rem 0;
}

.content-body.prose {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-text);
}

.prose h2 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4vw, 2rem);
  color: var(--c-white);
  letter-spacing: 0.04em;
  margin: 2rem 0 0.75rem;
}

.prose h3 {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--c-white);
  margin: 1.5rem 0 0.5rem;
}

.prose p {
  margin-bottom: 1.1rem;
}

.prose ul,
.prose ol {
  padding-left: 1.5rem;
  margin-bottom: 1.1rem;
}

.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }

.prose li {
  margin-bottom: 0.4rem;
  line-height: 1.7;
}

.prose strong {
  color: var(--c-white);
  font-weight: 600;
}

.prose em {
  color: var(--c-accent);
  font-style: normal;
}

.prose a {
  color: var(--c-accent);
  border-bottom: 1px solid rgba(74, 108, 247, 0.3);
}

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

.prose blockquote {
  border-left: 3px solid var(--c-accent);
  padding: 0.75rem 1.25rem;
  background: var(--c-surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5rem 0;
  color: var(--c-text);
}

.prose time {
  font-size: 0.82rem;
  color: var(--c-accent-gold);
  font-variant-numeric: tabular-nums;
}

/* ===== Topic Hero ===== */
.topic-hero {
  position: relative;
  min-height: 55vh;
  padding-top: var(--brand-bar-h);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.topic-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.topic-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.95) 30%, rgba(0,0,0,0.4) 100%);
}

.topic-hero__content {
  position: relative;
  z-index: 2;
  padding: 3rem 1.25rem 2.5rem;
  max-width: 720px;
}

.topic-hero__bg-num {
  position: absolute;
  right: 0;
  bottom: 1rem;
  font-family: var(--font-display);
  font-size: clamp(4rem, 15vw, 9rem);
  color: rgba(255,255,255,0.04);
  pointer-events: none;
  user-select: none;
  line-height: 1;
  z-index: 1;
}

.topic-hero__eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--c-accent);
  font-family: var(--font-display);
  margin-bottom: 0.6rem;
}

.topic-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 7vw, 4rem);
  letter-spacing: 0.03em;
  color: var(--c-white);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.topic-hero__desc {
  font-size: 0.95rem;
  color: var(--c-text);
  max-width: 500px;
  line-height: 1.6;
}

/* ===== 子页列表（section > article×n）===== */
.child-list {
  padding: 0 1.25rem 3rem;
  max-width: 900px;
  margin: 0 auto;
}

.child-list__grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.child-card {
  background: var(--c-surface);
  border-radius: var(--radius-card);
  display: flex;
  gap: 1rem;
  overflow: hidden;
  transition: background var(--transition), transform var(--transition);
  position: relative;
}

.child-card:hover {
  background: var(--c-surface2);
  transform: translateY(-2px);
}

.child-card__num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: rgba(74, 108, 247, 0.25);
  min-width: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 0 1rem 1rem;
  line-height: 1;
  flex-shrink: 0;
}

.child-card__media {
  flex-shrink: 0;
  width: 90px;
  overflow: hidden;
}

.child-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.child-card__body {
  padding: 1.1rem 1.25rem 1.1rem 0;
  flex: 1;
  min-width: 0;
}

.child-card__title {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.child-card__title a {
  color: var(--c-white);
}

.child-card__title a:hover {
  color: var(--c-accent);
}

.child-card__desc {
  font-size: 0.85rem;
  color: var(--c-text-muted);
  line-height: 1.5;
  margin-bottom: 0.6rem;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.child-card__date {
  font-size: 0.75rem;
  color: var(--c-text-dim);
  display: block;
  margin-bottom: 0.5rem;
}

.child-card__read {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--c-accent);
  letter-spacing: 0.04em;
}

/* ===== 相关专题 Pill ===== */
.related-topics {
  padding: 1.5rem 1.25rem 2.5rem;
  max-width: 900px;
  margin: 0 auto;
}

.related-topics__title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--c-text-muted);
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.related-topics__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.related-topic-pill {
  display: inline-block;
  background: var(--c-surface);
  color: var(--c-text);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 500;
  min-height: 40px;
  line-height: 1.4;
  border: 1px solid var(--c-border);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.related-topic-pill:hover {
  background: var(--c-accent);
  color: var(--c-white);
  border-color: var(--c-accent);
}

/* ===== Topic Cards（首页专题）===== */
.topics-grid {
  padding: 0 1.25rem;
  max-width: 900px;
  margin: 0 auto;
}

.topics-grid__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.topic-card {
  background: var(--c-surface);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: transform var(--transition), background var(--transition);
}

.topic-card:hover {
  transform: translateY(-3px);
  background: var(--c-surface2);
}

.topic-card__media {
  overflow: hidden;
  height: 180px;
}

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

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

.topic-card__body {
  padding: 1.25rem;
}

.topic-card__eyebrow {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--c-accent);
  font-weight: 600;
  display: block;
  margin-bottom: 0.4rem;
}

.topic-card__title {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.topic-card__title a {
  color: var(--c-white);
}

.topic-card__title a:hover {
  color: var(--c-accent);
}

.topic-card__desc {
  font-size: 0.85rem;
  color: var(--c-text-muted);
  line-height: 1.5;
  margin-bottom: 0.9rem;
}

.topic-card__cta {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--c-accent);
}

/* ===== 近期文章（首页）===== */
.recent-articles {
  padding: 0 1.25rem;
  max-width: 900px;
  margin: 0 auto;
}

.recent-articles__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.art-card {
  background: var(--c-surface);
  border-radius: var(--radius-card);
  transition: background var(--transition);
}

.art-card:hover {
  background: var(--c-surface2);
}

.art-card__inner {
  padding: 1.1rem 1.25rem;
}

.art-card__tag {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--c-accent2);
  font-weight: 600;
  display: block;
  margin-bottom: 0.3rem;
}

.art-card__title {
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.art-card__title a {
  color: var(--c-white);
}

.art-card__title a:hover {
  color: var(--c-accent);
}

.art-card__desc {
  font-size: 0.82rem;
  color: var(--c-text-muted);
  line-height: 1.4;
  margin-bottom: 0.4rem;
}

.art-card__date {
  font-size: 0.72rem;
  color: var(--c-text-dim);
}

/* ===== 文章 Hero ===== */
.art-hero {
  position: relative;
  min-height: 42vh;
  padding-top: var(--brand-bar-h);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.art-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.art-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.97) 20%, rgba(0,0,0,0.5) 100%);
}

.art-hero__content {
  position: relative;
  z-index: 2;
  padding: 2.5rem 1.25rem 2rem;
  max-width: 780px;
  width: 100%;
}

.art-hero__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 6vw, 3.2rem);
  letter-spacing: 0.03em;
  color: var(--c-white);
  line-height: 1.05;
  margin-bottom: 0.75rem;
}

.art-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.art-meta__date {
  font-size: 0.78rem;
  color: var(--c-text-muted);
}

.art-meta__topic {
  font-size: 0.75rem;
  background: var(--c-surface2);
  color: var(--c-accent);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  min-height: 28px;
  line-height: 1.5;
}

/* ===== 相关阅读 ===== */
.related-reads {
  padding: 1rem 1.25rem 2.5rem;
  max-width: 780px;
  margin: 0 auto;
}

.related-reads__title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--c-white);
  letter-spacing: 0.05em;
  margin-bottom: 0.9rem;
}

.related-reads__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.7rem;
}

.sibling-card {
  background: var(--c-surface);
  border-radius: var(--radius-card);
  padding: 1rem 1.25rem;
  transition: background var(--transition);
}

.sibling-card:hover {
  background: var(--c-surface2);
}

.sibling-card__title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.sibling-card__title a {
  color: var(--c-white);
}

.sibling-card__title a:hover {
  color: var(--c-accent);
}

.sibling-card__desc {
  font-size: 0.8rem;
  color: var(--c-text-muted);
  line-height: 1.4;
}

/* ===== 文章导航链接 ===== */
.article-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1rem 1.25rem 2rem;
  max-width: 780px;
  margin: 0 auto;
}

.article-nav-back,
.article-nav-home {
  display: inline-block;
  background: var(--c-surface);
  color: var(--c-text);
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 500;
  min-height: 44px;
  line-height: 1.6;
  border: 1px solid var(--c-border);
  transition: background var(--transition), color var(--transition);
}

.article-nav-back:hover,
.article-nav-home:hover {
  background: var(--c-accent);
  color: var(--c-white);
  border-color: var(--c-accent);
}

/* ===== About Hero ===== */
.about-hero {
  position: relative;
  min-height: 50vh;
  padding-top: var(--brand-bar-h);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--c-surface);
}

.about-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.95) 25%, rgba(0,0,0,0.4) 100%);
}

.about-hero__content {
  position: relative;
  z-index: 2;
  padding: 2.5rem 1.25rem 2rem;
  max-width: 720px;
}

.about-hero__eyebrow {
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--c-accent-gold);
  margin-bottom: 0.5rem;
}

.about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 6vw, 3.2rem);
  color: var(--c-white);
  letter-spacing: 0.03em;
  line-height: 1.05;
}

.about-hero__deco {
  position: absolute;
  right: 0;
  bottom: 1rem;
  font-family: var(--font-display);
  font-size: clamp(4rem, 14vw, 8rem);
  color: rgba(255,255,255,0.03);
  pointer-events: none;
  user-select: none;
  z-index: 1;
}

/* ===== About 内页链接 ===== */
.about-links {
  padding: 2rem 1.25rem 3rem;
  max-width: 780px;
  margin: 0 auto;
}

.about-links__title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--c-text-muted);
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
}

.about-links__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.about-link-card {
  background: var(--c-surface);
  border-radius: var(--radius-card);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-height: 80px;
  transition: background var(--transition), transform var(--transition);
}

.about-link-card:hover {
  background: var(--c-surface2);
  transform: translateY(-2px);
}

.about-link-card__num {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--c-accent);
  line-height: 1;
  text-shadow: 0 0 10px var(--c-accent-glow);
}

.about-link-card__name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-white);
}

/* ===== Privacy Header ===== */
.privacy-header {
  position: relative;
  min-height: 38vh;
  padding-top: var(--brand-bar-h);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
}

.privacy-header__content {
  position: relative;
  z-index: 2;
  padding: 2.5rem 1.25rem 2rem;
  max-width: 720px;
}

.privacy-header__eyebrow {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-text-muted);
  margin-bottom: 0.5rem;
}

.privacy-header__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 5vw, 2.8rem);
  color: var(--c-white);
  letter-spacing: 0.03em;
  line-height: 1.1;
  margin-bottom: 0.5rem;
}

.privacy-date {
  font-size: 0.78rem;
  color: var(--c-text-muted);
  display: block;
  margin-top: 0.4rem;
}

.privacy-header__deco {
  position: absolute;
  right: 0;
  bottom: 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(3rem, 12vw, 7rem);
  color: rgba(255,255,255,0.03);
  pointer-events: none;
  user-select: none;
}

/* ===== Privacy 页脚链接 ===== */
.privacy-footer-links {
  padding: 1.5rem 1.25rem 2rem;
  max-width: 780px;
  margin: 0 auto;
}

.privacy-footer-links__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--c-text-muted);
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.privacy-footer-links__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.pfl-item {
  display: inline-block;
  background: var(--c-surface);
  color: var(--c-text);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 500;
  min-height: 40px;
  line-height: 1.4;
  border: 1px solid var(--c-border);
  transition: background var(--transition), color var(--transition);
}

.pfl-item:hover {
  background: var(--c-accent);
  color: var(--c-white);
  border-color: var(--c-accent);
}

/* ===== 页脚（四栏 + 大 CTA + 底栏）===== */
.site-footer {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  padding-bottom: 1.5rem;
}

.footer__cta-block {
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent2) 100%);
  padding: 2.5rem 1.25rem;
  text-align: center;
}

.footer__cta-text {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 4vw, 1.9rem);
  color: var(--c-white);
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}

.footer__cta-btn {
  display: inline-block;
  background: var(--c-white);
  color: var(--c-accent);
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.06em;
  padding: 0.7rem 2rem;
  border-radius: var(--radius-pill);
  min-height: 46px;
  line-height: 1.4;
  font-weight: 700;
  transition: background var(--transition), color var(--transition);
}

.footer__cta-btn:hover {
  background: var(--c-black);
  color: var(--c-white);
}

.footer__cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  padding: 2rem 1.25rem 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
}

.footer__brand {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--c-white);
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}

.footer__brand-desc {
  font-size: 0.78rem;
  color: var(--c-text-muted);
  line-height: 1.5;
}

.footer__col-title {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--c-text-dim);
  font-weight: 600;
  margin-bottom: 0.6rem;
  text-transform: none;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.footer__links a {
  color: var(--c-text-muted);
  font-size: 0.85rem;
  min-height: 28px;
  line-height: 1.7;
  display: block;
}

.footer__links a:hover {
  color: var(--c-white);
}

.footer__note {
  font-size: 0.75rem;
  color: var(--c-text-dim);
  line-height: 1.6;
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 1rem 1.25rem 0;
  border-top: 1px solid var(--c-border);
  max-width: 1100px;
  margin: 0 auto;
}

.footer__copy {
  font-size: 0.72rem;
  color: var(--c-text-dim);
}

.footer__bottom-links {
  display: flex;
  gap: 1rem;
}

.footer__bottom-links a {
  font-size: 0.72rem;
  color: var(--c-text-dim);
  min-height: 28px;
  line-height: 2;
}

.footer__bottom-links a:hover {
  color: var(--c-white);
}

/* ===== 桌面断点 ===== */
@media (min-width: 768px) {
  .topics-grid__cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .recent-articles__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .related-reads__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .child-list__grid {
    gap: 1.25rem;
  }

  .child-card__num {
    font-size: 2.8rem;
    min-width: 64px;
  }

  .footer__cols {
    grid-template-columns: repeat(4, 1fr);
  }

  .about-links__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .hero__btn {
    font-size: 1.2rem;
    padding: 0.85rem 2.75rem;
  }
}

@media (min-width: 1024px) {
  .topics-grid__cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-article {
    padding: 0 2rem;
  }

  .topic-hero__content,
  .art-hero__content {
    padding-left: 2.5rem;
    padding-right: 2.5rem;
  }

  .hero__inner {
    padding: 4rem 3rem 5rem;
  }

  .hero__content {
    max-width: 780px;
  }

  .section-header {
    padding: 3rem 2rem 2rem;
  }

  .child-list,
  .related-topics,
  .related-reads,
  .about-links,
  .privacy-footer-links {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

/* ===== 动效 ===== */
@media (prefers-reduced-motion: no-preference) {
  .topic-card,
  .child-card,
  .art-card,
  .sibling-card,
  .about-link-card {
    will-change: transform;
  }

  .hero__title {
    animation: heroSlideUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
  }

  .hero__sub {
    animation: heroSlideUp 0.7s 0.12s cubic-bezier(0.22, 1, 0.36, 1) both;
  }

  .hero__btn {
    animation: heroSlideUp 0.7s 0.22s cubic-bezier(0.22, 1, 0.36, 1) both;
  }

  @keyframes heroSlideUp {
    from {
      opacity: 0;
      transform: translateY(24px) skewX(-2deg);
    }
    to {
      opacity: 1;
      transform: translateY(0) skewX(-2deg);
    }
  }

  .hero__bg-text {
    animation: bgTextPulse 4s ease-in-out infinite alternate;
  }

  @keyframes bgTextPulse {
    from { opacity: 0.03; }
    to   { opacity: 0.07; }
  }
}

/* ===== 横向滚动保险 ===== */
@media (max-width: 480px) {
  .related-reads__grid {
    grid-template-columns: 1fr;
  }

  .about-links__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .topics-grid__cards {
    grid-template-columns: 1fr;
  }

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

/* ===== 无障碍 skip-link ===== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--c-accent);
  color: var(--c-white);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  z-index: 9999;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0.5rem;
}