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

/* ===========================
   CSS 变量 & 重置
=========================== */
:root {
  --green: #69ff69;
  --cyan: #00ffff;
  --dark: #172617;
  --dark2: #1e321e;
  --dark3: #0e1a0e;
  --card-bg: #1a2e1a;
  --card-border: #2a4a2a;
  --text: #d4f5d4;
  --text-dim: #8ab88a;
  --radius: 18px;
  --radius-sm: 10px;
  --font-main: 'Lexend', 'Source Sans 3', system-ui, sans-serif;
  --bottom-bar-h: 60px;
  --glow-green: 0 0 12px #69ff6966, 0 0 30px #69ff6933;
  --glow-cyan: 0 0 12px #00ffff66, 0 0 30px #00ffff33;
  --metallic: linear-gradient(135deg, #69ff69 0%, #00ffff 40%, #b0fff0 60%, #69ff69 100%);
}

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

html {
  font-size: 18px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--dark3);
  color: var(--text);
  font-family: var(--font-main);
  line-height: 1.7;
  min-height: 100vh;
  padding-bottom: var(--bottom-bar-h);
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--green); text-decoration: none; }
a:hover { color: var(--cyan); }
a:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }
ul, ol { list-style: none; }
dl, dt, dd { margin: 0; padding: 0; }

/* ===========================
   覆盖遮罩菜单
=========================== */
.overlay-menu {
  position: fixed;
  inset: 0;
  background: #0a140a ee;
  backdrop-filter: blur(8px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transform: translateY(-100%);
  transition: transform 0.4s cubic-bezier(0.77,0,0.18,1), opacity 0.4s;
  opacity: 0;
  pointer-events: none;
}
.overlay-menu.is-open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}
.overlay-menu[aria-hidden="false"] {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}
.overlay-close {
  position: absolute;
  top: 24px;
  right: 24px;
  background: none;
  border: 2px solid var(--green);
  color: var(--green);
  font-size: 1.4rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
}
.overlay-close:hover { background: var(--green); color: var(--dark3); }

.overlay-nav dl {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: center;
}
.overlay-brand {
  font-size: 2rem;
  font-weight: 700;
  background: var(--metallic);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 24px;
  letter-spacing: 0.05em;
}
.overlay-nav dd a {
  display: block;
  padding: 12px 40px;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
  border-radius: var(--radius-sm);
  transition: background 0.2s, color 0.2s;
}
.overlay-nav dd a:hover {
  background: var(--dark2);
  color: var(--green);
}

/* ===========================
   底部固定栏
=========================== */
.bottom-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-bar-h);
  background: rgba(14,26,14,0.96);
  border-top: 1px solid #2a4a2a;
  backdrop-filter: blur(10px);
  z-index: 900;
}
.bottom-bar__inner {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 16px;
  gap: 8px;
  max-width: 1200px;
  margin: 0 auto;
}
.bottom-bar__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 44px;
  flex-shrink: 0;
}
.brand-text-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--metallic);
  border-radius: 8px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--dark3);
}
.brand-icon { width: 36px; height: 36px; border-radius: 8px; object-fit: cover; }

.bottom-bar__links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
  overflow: hidden;
}
.bottom-bar__link {
  display: flex;
  align-items: center;
  height: 44px;
  padding: 0 8px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-dim);
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}
.bottom-bar__link:hover { color: var(--green); background: var(--dark2); }

.bottom-bar__menu {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: none;
  border: 1.5px solid var(--green);
  border-radius: 10px;
  color: var(--green);
  font-size: 1.2rem;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.2s, color 0.2s;
}
.bottom-bar__menu:hover { background: var(--green); color: var(--dark3); }
.hamburger-icon { line-height: 1; }

/* ===========================
   Hero — 首页
=========================== */
.hero {
  position: relative;
  min-height: 45vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--dark3) 0%, #0d2b0d 60%, #0a1f2a 100%);
  padding: 64px 24px 80px;
}
.hero__bubble {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
}
.hero__bubble--1 {
  width: 340px; height: 340px;
  background: radial-gradient(circle, #69ff6930 0%, transparent 70%);
  top: -80px; left: -80px;
}
.hero__bubble--2 {
  width: 260px; height: 260px;
  background: radial-gradient(circle, #00ffff25 0%, transparent 70%);
  bottom: -60px; right: -60px;
}
.hero__inner {
  position: relative;
  z-index: 2;
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}
.hero__eyebrow {
  display: inline-block;
  padding: 4px 16px;
  border: 1px solid var(--green);
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--green);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
  text-shadow: var(--glow-green);
}
.hero__title {
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.25;
  background: var(--metallic);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
  text-shadow: none;
}
.hero__lead {
  font-size: 1.05rem;
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.7;
}
.hero__cta-row {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero__slash {
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 48px;
  background: var(--dark3);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  z-index: 3;
}

/* ===========================
   Buttons
=========================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--green), var(--cyan));
  color: var(--dark3);
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: filter 0.2s, transform 0.15s;
  box-shadow: var(--glow-green);
  min-height: 44px;
}
.btn-primary:hover {
  filter: brightness(1.15);
  transform: translateY(-2px);
  color: var(--dark3);
}
.btn-ghost {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  background: transparent;
  color: var(--cyan);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--cyan);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.15s;
  min-height: 44px;
}
.btn-ghost:hover {
  background: var(--cyan);
  color: var(--dark3);
  transform: translateY(-2px);
}

/* ===========================
   Topic Hero
=========================== */
.topic-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, #0e1e0e 0%, #0d2b1d 100%);
  padding: 56px 24px 72px;
  min-height: 38vh;
  display: flex;
  align-items: center;
}
.topic-hero__bubble {
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, #00ffff20 0%, transparent 70%);
  top: -80px;
  right: -60px;
  pointer-events: none;
  filter: blur(40px);
}
.topic-hero__inner {
  position: relative;
  z-index: 2;
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
  width: 100%;
}
.topic-hero__title {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 700;
  background: var(--metallic);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 16px 0 16px;
  line-height: 1.3;
}
.topic-hero__desc {
  color: var(--text-dim);
  font-size: 1rem;
  max-width: 560px;
  margin: 0 auto 16px;
}
.topic-hero__count {
  display: inline-block;
  padding: 4px 14px;
  background: var(--dark2);
  border: 1px solid var(--card-border);
  border-radius: 100px;
  font-size: 0.82rem;
  color: var(--green);
  font-weight: 500;
}
.topic-hero__slash {
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 40px;
  background: var(--dark3);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  z-index: 3;
}

/* ===========================
   Article Top
=========================== */
.article-top {
  background: linear-gradient(160deg, #0e1e0e 0%, #0a1e2a 100%);
  padding: 48px 24px 56px;
  position: relative;
  overflow: hidden;
}
.article-top::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 36px;
  background: var(--dark3);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}
.article-top__inner {
  max-width: 800px;
  margin: 0 auto;
}
.article-top__title {
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
  margin: 16px 0 20px;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.article-meta__date {
  font-size: 0.85rem;
  color: var(--text-dim);
}
.article-meta__cat {
  font-size: 0.85rem;
  color: var(--cyan);
  border: 1px solid #00ffff44;
  padding: 2px 10px;
  border-radius: 100px;
}
.article-hero-img {
  margin-top: 24px;
  border-radius: var(--radius);
  overflow: hidden;
  max-height: 360px;
}
.article-hero__img { width: 100%; object-fit: cover; }

/* ===========================
   About Hero
=========================== */
.about-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #0a140a 0%, #0a1e2a 100%);
  padding: 56px 24px 72px;
  min-height: 36vh;
  display: flex;
  align-items: center;
}
.about-hero__bubble {
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, #69ff6918 0%, transparent 70%);
  bottom: -100px;
  right: -100px;
  pointer-events: none;
  filter: blur(50px);
}
.about-hero__inner {
  position: relative;
  z-index: 2;
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  width: 100%;
}
.about-hero__title {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 700;
  background: var(--metallic);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 16px 0;
}
.about-hero__subtitle {
  color: var(--text-dim);
  font-size: 1rem;
  max-width: 520px;
  margin: 0 auto;
}
.about-hero__slash {
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 40px;
  background: var(--dark3);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  z-index: 3;
}

/* ===========================
   Privacy Top
=========================== */
.privacy-top {
  background: var(--dark2);
  border-bottom: 1px solid var(--card-border);
  padding: 40px 24px;
}
.privacy-top__inner {
  max-width: 800px;
  margin: 0 auto;
}
.privacy-top__title {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 700;
  color: var(--text);
  margin: 12px 0 8px;
}
.privacy-top__date {
  font-size: 0.88rem;
  color: var(--text-dim);
}

/* ===========================
   面包屑
=========================== */
.breadcrumb {
  font-size: 0.82rem;
  color: var(--text-dim);
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
  justify-content: center;
}
.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--green); }
.breadcrumb span:not([aria-hidden]) { color: var(--text); }

/* ===========================
   内容容器
=========================== */
.content-wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 24px 56px;
}
.content-wrap--narrow {
  max-width: 760px;
}

/* ===========================
   正文排版
=========================== */
.prose-block {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
}
.prose-block h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--green);
  margin: 2.2em 0 0.8em;
  text-shadow: var(--glow-green);
}
.prose-block h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--cyan);
  margin: 1.8em 0 0.6em;
}
.prose-block h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin: 1.4em 0 0.4em;
}
.prose-block p {
  margin-bottom: 1.2em;
}
.prose-block ul, .prose-block ol {
  padding-left: 1.4em;
  margin-bottom: 1.2em;
  list-style: disc;
}
.prose-block ol { list-style: decimal; }
.prose-block li { margin-bottom: 0.4em; }
.prose-block a { color: var(--cyan); text-decoration: underline; text-underline-offset: 3px; }
.prose-block a:hover { color: var(--green); }
.prose-block strong { color: var(--green); font-weight: 600; }
.prose-block em { color: var(--cyan); font-style: normal; font-weight: 500; }
.prose-block blockquote {
  border-left: 3px solid var(--green);
  padding: 12px 20px;
  margin: 1.5em 0;
  background: var(--dark2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-dim);
}
.prose-block table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5em;
  font-size: 0.92rem;
}
.prose-block th {
  background: var(--dark2);
  color: var(--green);
  padding: 10px 14px;
  text-align: left;
  border-bottom: 2px solid var(--green);
}
.prose-block td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--card-border);
}
.prose-block tr:hover td { background: var(--card-bg); }
.prose-block code {
  background: var(--dark2);
  color: var(--cyan);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88em;
}
.prose-block pre {
  background: var(--dark2);
  padding: 16px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin-bottom: 1.5em;
}
.prose-block time {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1em;
}

/* ===========================
   Section 通用
=========================== */
.section-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
  padding: 0 24px;
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}
.section-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--green);
  white-space: nowrap;
  text-shadow: var(--glow-green);
}
.section-line {
  display: block;
  height: 1px;
  background: linear-gradient(90deg, var(--green), transparent);
  flex: 1;
  opacity: 0.4;
}

/* ===========================
   Topic 卡片网格（首页）
=========================== */
.topic-section, .recent-section, .children-section, .related-section {
  padding: 40px 0;
}
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  padding: 0 24px;
  max-width: 1100px;
  margin: 0 auto;
}
.topic-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px 22px 16px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
  color: var(--text);
  border-bottom: 3px solid var(--green);
}
.topic-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--green), var(--cyan));
  opacity: 0.5;
  transition: opacity 0.2s;
}
.topic-card:hover {
  border-color: var(--green);
  transform: translateY(-4px);
  color: var(--text);
}
.topic-card:hover::before { opacity: 1; }
.topic-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
}
.topic-card__desc {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.5;
  flex: 1;
}
.topic-card__count {
  font-size: 0.78rem;
  color: var(--green);
  font-weight: 500;
}
.topic-card__arrow {
  font-size: 1.2rem;
  color: var(--cyan);
  align-self: flex-end;
  transition: transform 0.2s;
}
.topic-card:hover .topic-card__arrow { transform: translateX(4px); }

/* ===========================
   文章列表（首页近期）
=========================== */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  padding: 0 24px;
  max-width: 1100px;
  margin: 0 auto;
}
.article-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 0.2s, transform 0.2s;
  color: var(--text);
  border-bottom: 3px solid var(--cyan);
}
.article-item:hover {
  border-color: var(--cyan);
  transform: translateY(-3px);
  color: var(--text);
}
.article-item strong {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}
.article-item span {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
  flex: 1;
}
.article-item time {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ===========================
   子页块列表（topic/article）
=========================== */
.child-blocks {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  padding: 0 24px;
  max-width: 1100px;
  margin: 0 auto;
}
.child-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 22px 20px 14px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  color: var(--text);
  border-bottom: 3px solid transparent;
  background-image: linear-gradient(var(--card-bg), var(--card-bg)), linear-gradient(135deg, var(--green), var(--cyan));
  background-origin: border-box;
  background-clip: padding-box, border-box;
  position: relative;
}
.child-block::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--green), var(--cyan));
  border-radius: 0 0 var(--radius) var(--radius);
  opacity: 0.6;
  transition: opacity 0.2s;
}
.child-block:hover {
  border-color: var(--green);
  transform: translateY(-4px);
  box-shadow: var(--glow-green);
  color: var(--text);
}
.child-block:hover::after { opacity: 1; }
.child-block__title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
}
.child-block__desc {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.5;
  flex: 1;
}
.child-block__date {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ===========================
   About 布局
=========================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  align-items: start;
}
.about-sidebar { position: sticky; top: 24px; }
.about-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  border-bottom: 3px solid var(--green);
}
.about-card__logo { margin-bottom: 16px; }
.about-card__name {
  font-size: 1.3rem;
  font-weight: 700;
  background: var(--metallic);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.about-card__desc {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 20px;
}
.about-card__links dl { display: flex; flex-direction: column; gap: 4px; }
.about-card__links dt { display: none; }
.about-card__links dd a {
  display: block;
  padding: 8px 12px;
  font-size: 0.9rem;
  color: var(--text-dim);
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
}
.about-card__links dd a:hover { background: var(--dark2); color: var(--green); }

/* ===========================
   Privacy 返回按钮
=========================== */
.privacy-back {
  display: flex;
  gap: 16px;
  margin-top: 40px;
  flex-wrap: wrap;
}

/* ===========================
   页脚
=========================== */
.site-footer {
  background: var(--dark3);
  border-top: 1px solid var(--card-border);
  padding-top: 56px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 48px;
}
.footer-brand-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  background: var(--metallic);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.footer-brand-desc {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.6;
  max-width: 320px;
}
.footer-col-title {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--green);
  text-transform: uppercase;
  margin-bottom: 16px;
  text-shadow: var(--glow-green);
}
.footer-nav-col dl,
.footer-legal-col dl {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.footer-nav-col dd a,
.footer-legal-col dd a {
  display: block;
  padding: 6px 0;
  font-size: 0.9rem;
  color: var(--text-dim);
  transition: color 0.2s;
  min-height: 40px;
  display: flex;
  align-items: center;
}
.footer-nav-col dd a:hover,
.footer-legal-col dd a:hover { color: var(--green); }
.footer-warning {
  margin-top: 20px;
  font-size: 0.78rem;
  color: #ff8080;
  line-height: 1.5;
  border: 1px solid #ff808044;
  border-radius: 8px;
  padding: 8px 12px;
}
.footer-bottom {
  border-top: 1px solid var(--card-border);
  text-align: center;
  padding: 20px 24px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ===========================
   Scroll Reveal 动效
=========================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-stagger {
  transition-delay: calc(var(--stagger, 0) * 80ms);
}

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

/* ===========================
   Iridescent shimmer overlay
=========================== */
.topic-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #69ff6908 0%, #00ffff08 50%, #ff69b408 100%);
  pointer-events: none;
  border-radius: var(--radius);
}

/* ===========================
   Glow animation
=========================== */
@keyframes glow-pulse {
  0%, 100% { box-shadow: var(--glow-green); }
  50% { box-shadow: 0 0 20px #69ff6999, 0 0 50px #69ff6955; }
}
.btn-primary { animation: glow-pulse 3s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) {
  .btn-primary { animation: none; }
}

/* ===========================
   响应式
=========================== */
@media (max-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
  .about-sidebar { position: static; }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .topic-grid { grid-template-columns: 1fr; }
  .article-list { grid-template-columns: 1fr; }
  .child-blocks { grid-template-columns: 1fr; }
  .bottom-bar__links { gap: 0; }
  .bottom-bar__link { padding: 0 5px; font-size: 0.72rem; }
  .hero { padding: 56px 20px 72px; }
  .content-wrap { padding: 32px 16px 48px; }
  .section-header { padding: 0 16px; }
  .topic-grid, .article-list, .child-blocks { padding: 0 16px; }
  .footer-inner { padding: 0 16px 40px; }
  .footer-brand-name { font-size: 2.4rem; }
  .breadcrumb { justify-content: flex-start; }
}

@media (max-width: 480px) {
  html { font-size: 17px; }
  .hero__cta-row { flex-direction: column; align-items: center; }
  .btn-primary, .btn-ghost { width: 100%; justify-content: center; }
  .overlay-nav dd a { padding: 12px 20px; font-size: 0.95rem; }
  .footer-brand-name { font-size: 2rem; }
  .privacy-back { flex-direction: column; }
  .privacy-back .btn-ghost { text-align: center; justify-content: center; }
}