@import url('https://fonts.googleapis.com/css2?family=Chakra+Petch:wght@300;400;500;600;700&family=Russo+One&display=swap');

/* ===== 基础变量 ===== */
:root {
  --c-teal: #5cc6b0;
  --c-sand: #d4c4a8;
  --c-dark: #172623;
  --c-teal-d: #3da08a;
  --c-teal-l: #8dddd0;
  --c-sand-d: #b8a88a;
  --c-sand-l: #ede4d4;
  --c-earth: #c67b5c;
  --c-olive: #6b7b3c;
  --c-bg: #f5efe4;
  --c-bg-alt: #ede4d4;
  --c-text: #172623;
  --c-text-muted: #5a5040;
  --c-border: #c8b898;
  --r-card: 28px;
  --r-btn: 999px;
  --r-sm: 12px;
  --shadow-soft: 0 4px 24px rgba(23,38,35,0.10);
  --font-head: 'Russo One', 'Chakra Petch', system-ui, sans-serif;
  --font-body: 'Chakra Petch', system-ui, -apple-system, sans-serif;
  --max-content: 820px;
  --max-wide: 1200px;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 17px; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.7;
  min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-teal-d); text-decoration: none; }
a:hover { color: var(--c-earth); text-decoration: underline; }
ul { list-style: none; }

/* ===== 顶部公告条 ===== */
.top-bar {
  background: var(--c-dark);
  color: var(--c-teal-l);
  text-align: center;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  padding: 0.45rem 1rem;
  font-family: var(--font-head);
}
.top-bar span { opacity: 0.9; }

/* ===== 站点头部 ===== */
.site-header {
  background: var(--c-dark);
  border-bottom: 2px solid var(--c-teal);
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand-row {
  display: flex;
  align-items: center;
  padding: 0.9rem 1.5rem 0.5rem;
  max-width: var(--max-wide);
  margin: 0 auto;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}
.brand-logo { width: 36px; height: 36px; border-radius: 8px; }
.brand-name {
  font-family: var(--font-head);
  font-size: 1.3rem;
  color: var(--c-sand);
  letter-spacing: 0.04em;
  line-height: 1.2;
}
.brand-name:hover { color: var(--c-teal); }

/* ===== 导航 details/summary/menu ===== */
.main-nav {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0 1.5rem 0.7rem;
}

.nav-details { border: none; background: none; }
.nav-details[open] > summary .nav-toggle-icon { transform: rotate(180deg); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  background: var(--c-teal);
  color: var(--c-dark);
  border: none;
  border-radius: var(--r-btn);
  padding: 0.55rem 1.2rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  list-style: none;
  min-height: 42px;
}
.nav-toggle::-webkit-details-marker { display: none; }

.nav-menu {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.nav-menu li a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0.45rem 1.1rem;
  border-radius: var(--r-btn);
  background: rgba(92,198,176,0.12);
  color: var(--c-sand);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  border: 1px solid rgba(92,198,176,0.25);
  transition: background 0.2s ease-out, color 0.2s ease-out;
  text-decoration: none;
  white-space: nowrap;
}
.nav-menu li a:hover,
.nav-menu li a[aria-current="page"] {
  background: var(--c-teal);
  color: var(--c-dark);
  border-color: var(--c-teal);
  text-decoration: none;
}

/* ===== Hero（仅首页）===== */
.hero-section {
  position: relative;
  min-height: 70vh;
  background: var(--c-dark);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero-deco {
  position: absolute;
  right: -0.05em;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-head);
  font-size: clamp(6rem, 18vw, 16rem);
  color: rgba(92,198,176,0.07);
  pointer-events: none;
  user-select: none;
  line-height: 1;
  letter-spacing: -0.02em;
  z-index: 0;
}

.hero-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 4rem 2rem;
  width: 100%;
}

.hero-media {
  border-radius: var(--r-card);
  overflow: hidden;
  position: relative;
}
.hero-img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  border-radius: var(--r-card);
  border: 2px solid rgba(92,198,176,0.3);
}
.hero-placeholder {
  width: 100%;
  height: 420px;
  background: linear-gradient(135deg, rgba(92,198,176,0.15) 0%, rgba(198,123,92,0.15) 100%);
  border-radius: var(--r-card);
  border: 2px solid rgba(92,198,176,0.2);
}

.hero-text {
  text-align: center;
  color: var(--c-sand);
}
.hero-eyebrow {
  display: inline-block;
  background: rgba(92,198,176,0.18);
  color: var(--c-teal);
  border: 1px solid rgba(92,198,176,0.4);
  border-radius: var(--r-btn);
  padding: 0.3rem 1rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  font-family: var(--font-body);
}
.hero-text h1 {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: var(--c-sand);
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}
.hero-desc {
  color: rgba(212,196,168,0.8);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== 按钮 ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0.7rem 2rem;
  background: var(--c-teal);
  color: var(--c-dark);
  border-radius: var(--r-btn);
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background 0.2s ease-out, transform 0.15s ease-out;
  border: 2px solid var(--c-teal);
}
.btn-primary:hover {
  background: var(--c-teal-d);
  border-color: var(--c-teal-d);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.6rem 1.6rem;
  background: transparent;
  color: var(--c-teal-d);
  border: 2px solid var(--c-teal);
  border-radius: var(--r-btn);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s ease-out, color 0.2s ease-out;
}
.btn-secondary:hover {
  background: var(--c-teal);
  color: var(--c-dark);
  text-decoration: none;
}
.btn-text {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.5rem 1rem;
  color: var(--c-text-muted);
  font-size: 0.9rem;
  text-decoration: none;
  border-radius: var(--r-sm);
  transition: color 0.2s;
}
.btn-text:hover { color: var(--c-teal-d); text-decoration: none; }

/* ===== 主内容区骨架 ===== */
.wrap {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

.page-section {
  display: block;
}

.page-article {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.page-article.no-aside {
  grid-template-columns: 1fr;
}

/* ===== 侧边栏（左侧）===== */
.page-aside {
  position: sticky;
  top: 100px;
}

.aside-inner {
  background: var(--c-sand-l);
  border: 1px solid var(--c-border);
  border-radius: var(--r-card);
  padding: 1.4rem 1.2rem;
}

.aside-title {
  font-family: var(--font-head);
  font-size: 0.78rem;
  color: var(--c-text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--c-border);
}
.aside-title span { display: inline; }

.aside-links li { margin-bottom: 0.2rem; }
.aside-links a {
  display: block;
  padding: 0.45rem 0.6rem;
  border-radius: var(--r-sm);
  font-size: 0.87rem;
  color: var(--c-text);
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: background 0.15s;
}
.aside-links a:hover {
  background: rgba(92,198,176,0.12);
  color: var(--c-teal-d);
  text-decoration: none;
}
.aside-back {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 0.4rem 0.6rem;
  font-size: 0.85rem;
  color: var(--c-teal-d);
  border-radius: var(--r-sm);
  margin-bottom: 1rem;
  background: rgba(92,198,176,0.08);
  border: 1px solid rgba(92,198,176,0.2);
}
.aside-back:hover { background: rgba(92,198,176,0.18); text-decoration: none; }

.aside-parent { margin-bottom: 0.75rem; }

/* ===== 正文 ===== */
.page-body {
  min-width: 0;
}

.page-body h1 {
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  color: var(--c-dark);
  line-height: 1.25;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  font-size: 0.82rem;
  color: var(--c-text-muted);
}
.page-meta time {
  background: var(--c-sand-l);
  border: 1px solid var(--c-border);
  border-radius: var(--r-btn);
  padding: 0.2rem 0.75rem;
}

.page-content {
  line-height: 1.8;
  font-size: 1rem;
  color: var(--c-text);
  max-width: var(--max-content);
}
.page-content h2 {
  font-family: var(--font-head);
  font-size: 1.4rem;
  color: var(--c-dark);
  margin: 2rem 0 0.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--c-sand);
}
.page-content h2 span { display: inline; }
.page-content h3 {
  font-family: var(--font-head);
  font-size: 1.15rem;
  color: var(--c-dark);
  margin: 1.5rem 0 0.6rem;
}
.page-content h3 span { display: inline; }
.page-content p { margin-bottom: 1.1rem; }
.page-content ul, .page-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.1rem;
  list-style: disc;
}
.page-content ol { list-style: decimal; }
.page-content li { margin-bottom: 0.4rem; }
.page-content a { color: var(--c-teal-d); }
.page-content a:hover { color: var(--c-earth); }
.page-content strong { font-weight: 700; color: var(--c-dark); }
.page-content blockquote {
  border-left: 3px solid var(--c-teal);
  margin: 1.5rem 0;
  padding: 0.8rem 1.2rem;
  background: var(--c-sand-l);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-style: italic;
  color: var(--c-text-muted);
}
.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}
.page-content th, .page-content td {
  border: 1px solid var(--c-border);
  padding: 0.6rem 0.8rem;
  text-align: left;
}
.page-content th {
  background: var(--c-sand-l);
  font-weight: 700;
  font-family: var(--font-head);
}
.page-content tr:nth-child(even) { background: rgba(212,196,168,0.18); }

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--c-text-muted);
  margin-bottom: 1.2rem;
}
.breadcrumb a { color: var(--c-teal-d); }
.breadcrumb span { color: var(--c-text-muted); }

/* ===== 首页专区 ===== */
.home-body { max-width: 100%; }
.home-content { max-width: var(--max-content); margin-bottom: 3rem; }

.topics-block { margin-bottom: 3rem; }
.topics-block h2 {
  font-family: var(--font-head);
  font-size: 1.5rem;
  color: var(--c-dark);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--c-sand);
}
.topics-block h2 span { display: inline; }

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.2rem;
}

.topic-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.4rem 1.3rem;
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-card);
  background: var(--c-sand-l);
  text-decoration: none;
  transition: border-color 0.2s ease-out, transform 0.2s ease-out;
  color: var(--c-text);
}
.topic-card:hover {
  border-color: var(--c-teal);
  transform: translateY(-2px);
  text-decoration: none;
  color: var(--c-text);
}
.topic-card strong {
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--c-dark);
  display: block;
}
.topic-card .card-desc {
  font-size: 0.84rem;
  color: var(--c-text-muted);
  line-height: 1.5;
}
.topic-card .card-count {
  font-size: 0.78rem;
  color: var(--c-teal-d);
  font-weight: 600;
  margin-top: auto;
}

.recent-block { margin-bottom: 2rem; }
.recent-block h2 {
  font-family: var(--font-head);
  font-size: 1.5rem;
  color: var(--c-dark);
  margin-bottom: 1.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--c-sand);
}
.recent-block h2 span { display: inline; }

.article-rows { margin-bottom: 1.5rem; }
.article-row { border-bottom: 1px solid var(--c-border); }
.article-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem 0.5rem;
  color: var(--c-text);
  text-decoration: none;
  min-height: 48px;
  flex-wrap: wrap;
  transition: color 0.15s;
}
.article-link:hover { color: var(--c-teal-d); text-decoration: none; }
.article-link strong {
  font-size: 0.95rem;
  font-weight: 600;
  flex: 1;
  min-width: 200px;
}
.article-link .article-parent {
  font-size: 0.78rem;
  color: var(--c-teal-d);
  background: rgba(92,198,176,0.1);
  border: 1px solid rgba(92,198,176,0.25);
  border-radius: var(--r-btn);
  padding: 0.15rem 0.6rem;
  white-space: nowrap;
}
.article-link time {
  font-size: 0.78rem;
  color: var(--c-text-muted);
  white-space: nowrap;
}

/* ===== 专题页 ===== */
.topic-banner {
  position: relative;
  background: var(--c-dark);
  min-height: 220px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}
.topic-hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}
.topic-banner-text {
  position: relative;
  z-index: 1;
  padding: 2rem 2rem 2.5rem;
  max-width: var(--max-wide);
  margin: 0 auto;
  width: 100%;
}
.topic-eyebrow {
  display: inline-block;
  background: rgba(92,198,176,0.2);
  color: var(--c-teal);
  border: 1px solid rgba(92,198,176,0.4);
  border-radius: var(--r-btn);
  padding: 0.25rem 0.9rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-bottom: 0.6rem;
}
.topic-banner-text h1 {
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  color: var(--c-sand);
  line-height: 1.2;
}

.children-block { margin-top: 2.5rem; }
.children-block h2 {
  font-family: var(--font-head);
  font-size: 1.4rem;
  color: var(--c-dark);
  margin-bottom: 1.2rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--c-sand);
}
.children-block h2 span { display: inline; }

.child-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.2rem;
}

.child-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.4rem 1.3rem;
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-card);
  background: var(--c-bg);
  text-decoration: none;
  color: var(--c-text);
  position: relative;
  transition: border-color 0.2s ease-out, box-shadow 0.2s ease-out;
}
.child-card:hover {
  border-color: var(--c-teal);
  box-shadow: 0 6px 24px rgba(92,198,176,0.12);
  text-decoration: none;
  color: var(--c-text);
}
.child-card strong {
  font-family: var(--font-head);
  font-size: 0.97rem;
  color: var(--c-dark);
  display: block;
  padding-right: 2.5rem;
}
.child-card .card-num {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-family: var(--font-head);
  font-size: 1.3rem;
  color: rgba(92,198,176,0.25);
  line-height: 1;
}
.child-card .card-desc {
  font-size: 0.84rem;
  color: var(--c-text-muted);
  line-height: 1.5;
}
.child-card time {
  font-size: 0.76rem;
  color: var(--c-text-muted);
  margin-top: auto;
}

/* ===== 文章页 ===== */
.article-img-wrap {
  margin-bottom: 1.5rem;
  border-radius: var(--r-card);
  overflow: hidden;
  border: 1.5px solid var(--c-border);
}
.article-hero-img {
  width: 100%;
  max-height: 360px;
  object-fit: cover;
}

.article-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--c-border);
}

/* ===== 标签页 ===== */
.tag-label-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}
.tag-badge {
  display: inline-block;
  background: var(--c-teal);
  color: var(--c-dark);
  border-radius: var(--r-btn);
  padding: 0.3rem 1rem;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: var(--font-head);
}
.tag-count {
  font-size: 0.82rem;
  color: var(--c-text-muted);
}

.tag-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.2rem;
  margin-top: 2rem;
}

.tag-card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.3rem 1.2rem;
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-card);
  background: var(--c-bg);
  text-decoration: none;
  color: var(--c-text);
  transition: border-color 0.2s ease-out, transform 0.2s ease-out;
}
.tag-card:hover {
  border-color: var(--c-teal);
  transform: translateY(-2px);
  text-decoration: none;
  color: var(--c-text);
}
.tag-card strong {
  font-family: var(--font-head);
  font-size: 0.95rem;
  color: var(--c-dark);
}
.tag-card .card-parent {
  font-size: 0.75rem;
  color: var(--c-teal-d);
  background: rgba(92,198,176,0.1);
  border-radius: var(--r-btn);
  padding: 0.15rem 0.5rem;
  align-self: flex-start;
}
.tag-card .card-desc {
  font-size: 0.83rem;
  color: var(--c-text-muted);
  line-height: 1.5;
}
.tag-card time {
  font-size: 0.76rem;
  color: var(--c-text-muted);
  margin-top: auto;
}

/* ===== About 页 ===== */
.about-nav-block { margin-top: 2.5rem; }
.about-nav-block h2 {
  font-family: var(--font-head);
  font-size: 1.3rem;
  color: var(--c-dark);
  margin-bottom: 1.2rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--c-sand);
}
.about-nav-block h2 span { display: inline; }

.about-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}
.about-links a {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.2rem 1.1rem;
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-card);
  background: var(--c-sand-l);
  text-decoration: none;
  color: var(--c-text);
  transition: border-color 0.2s ease-out;
}
.about-links a:hover {
  border-color: var(--c-teal);
  text-decoration: none;
  color: var(--c-text);
}
.about-links a strong {
  font-family: var(--font-head);
  font-size: 0.95rem;
  color: var(--c-dark);
}
.about-links a span {
  font-size: 0.82rem;
  color: var(--c-text-muted);
}

/* ===== Privacy 页 ===== */
.privacy-footer-nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--c-border);
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--c-dark);
  color: var(--c-sand);
  margin-top: 4rem;
  padding: 3rem 1.5rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  max-width: var(--max-wide);
  margin: 0 auto;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(212,196,168,0.15);
}

.footer-col h4 {
  font-family: var(--font-head);
  font-size: 0.78rem;
  color: var(--c-teal);
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
  text-transform: uppercase;
}
.footer-col h4 span { display: inline; }

.footer-address {
  font-style: normal;
  line-height: 1.7;
  font-size: 0.88rem;
  color: var(--c-sand);
}
.footer-address strong {
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--c-sand-l);
  display: block;
  margin-bottom: 0.3rem;
}

.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 0.35rem; }
.footer-col ul li a {
  color: rgba(212,196,168,0.7);
  font-size: 0.87rem;
  text-decoration: none;
  display: flex;
  align-items: center;
  min-height: 40px;
  transition: color 0.2s;
  padding: 0.1rem 0;
}
.footer-col ul li a:hover { color: var(--c-teal); text-decoration: none; }

.footer-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 1rem 0 1.5rem;
  font-size: 0.8rem;
  color: rgba(212,196,168,0.5);
}
.footer-bar a {
  color: rgba(212,196,168,0.6);
  text-decoration: none;
}
.footer-bar a:hover { color: var(--c-teal); }

/* ===== 滚动揭示动效 ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease-out, transform 0.55s ease-out;
}
.reveal.in-view {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation: none !important; transition: none !important; }
}

/* ===== 纹理叠层 ===== */
.hero-section::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem 1.5rem;
  }
  .hero-media { display: none; }
  .hero-section { min-height: auto; }
  .hero-deco { font-size: clamp(4rem, 14vw, 8rem); }
}

@media (max-width: 768px) {
  .page-article {
    grid-template-columns: 1fr;
  }
  .page-aside {
    position: static;
    order: 2;
  }
  .page-body { order: 1; }

  .nav-toggle { display: inline-flex; }
  .nav-details:not([open]) .nav-menu { display: none; }
  .nav-details[open] .nav-menu {
    display: flex;
    flex-direction: column;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--c-dark);
    padding: 1rem 1.5rem;
    border-top: 1px solid rgba(92,198,176,0.2);
    border-bottom: 2px solid var(--c-teal);
    z-index: 200;
    max-height: 70vh;
    overflow-y: auto;
  }
  .nav-details[open] .nav-menu li a {
    width: 100%;
    min-height: 48px;
    font-size: 0.95rem;
  }
  .main-nav { position: relative; }

  .topic-grid { grid-template-columns: 1fr; }
  .child-grid { grid-template-columns: 1fr; }
  .tag-grid { grid-template-columns: 1fr; }
  .about-links { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: 1.5rem; }
  .footer-bar { flex-direction: column; align-items: flex-start; gap: 0.4rem; }

  .wrap { padding: 1.5rem 1rem; }
  .brand-row { padding: 0.7rem 1rem 0.4rem; }
}

@media (max-width: 480px) {
  html { font-size: 16px; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-text h1 { font-size: 1.6rem; }
  .page-body h1 { font-size: 1.5rem; }
  .topic-banner-text h1 { font-size: 1.5rem; }
  .brand-name { font-size: 1.1rem; }
  .article-rows .article-link { flex-direction: column; align-items: flex-start; gap: 0.3rem; }
}