:root {
  --primary-color: #ff9000;
  --bg-color: #0e0f13;
  --card-bg-color: #151823;
  --text-color: #e8e8ea;
}

html {
  font-size: 16px;
  /* 平滑滚动兜底，JS中也有 scrollIntoView 触发 */
  scroll-behavior: smooth;
}

body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}
:root {
  /* 容器宽度用于居中对齐基线（与 main 对齐） */
  --container-max: 1200px;
  --container-pad: 1rem;
}

header {
  background: transparent;
  padding: 1rem;
  text-align: center;
}

header h1 {
  font-size: 2rem;
  font-weight: bold;
  color: var(--primary-color);
  margin: 0;
  text-transform: uppercase;
  text-shadow: 1px 1px 0 rgba(0,0,0,.25), -1px -1px 0 rgba(255,255,255,.03);
  letter-spacing: .5px;
}

/* 顶部导航容器，使用内层 wrapper 保证内容在大屏居中 */
nav {
  background: transparent;
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 0.75rem 0;
  display: flex;
  justify-content: center;
  backdrop-filter: saturate(120%) blur(6px);
}
nav .nav-wrap {
  max-width: var(--container-max);
  padding: 0 var(--container-pad);
  margin: 0 auto;
  width: 100%;
  display: flex;
  justify-content: center;
  text-align: center;
}

nav {
  /* 使整个导航条占满宽度，便于内容在内部居中 */
  width: 100%;
}
nav ul {
  list-style-type: none;
  padding: 0.5rem;
  margin: 0 auto;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem;
  width: max-content;
  background: var(--card-bg-color);
  border-radius: 9999px;
  box-shadow: var(--neu-out);
}

nav li {
  margin: 0; /* 使用 gap 控制间距，避免撑开左侧 */
}

nav a {
  display: inline-block;
  color: var(--text-color);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.5rem 0.9rem;
  border-radius: 9999px;
  transition: background-color 0.3s, color 0.3s, box-shadow var(--transition-fast, 180ms), transform var(--transition-fast, 180ms);
  background: var(--card-bg-color);
  box-shadow: var(--neu-out);
  will-change: transform, box-shadow;
}
nav a:focus-visible {
  outline: none;
  box-shadow: var(--neu-out), 0 0 0 2px rgba(255,144,0,.45);
}

nav a:hover,
nav a.active {
  background-color: var(--primary-color);
  color: #000;
}

main {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 1rem;
}

.category-title {
  font-size: 1.5rem;
  font-weight: bold;
  margin: 2rem 0 1rem;
  color: var(--primary-color);
  border-left: none;
  padding-left: 0.2rem;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  text-shadow: 1px 1px 0 rgba(0,0,0,.35), -1px -1px 0 rgba(255,255,255,.04);
  position: relative;
}
.category-title::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-left: 8px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(255,144,0,.9), rgba(255,144,0,.25));
  box-shadow: 2px 2px 4px rgba(0,0,0,.35), -2px -2px 4px rgba(255,255,255,.04);
  vertical-align: middle;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(8rem, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.link-card {
  background: var(--card-bg-color);
  border-radius: var(--radius-lg, 16px);
  padding: 1.2rem 0.8rem;
  text-align: center;
  transition: transform var(--transition-fast,180ms) ease, box-shadow var(--transition-fast,180ms) ease, background var(--transition-fast,180ms) ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--neu-out);
}
.link-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(65% 55% at 30% 25%, rgba(255,255,255,.05), transparent 60%),
    radial-gradient(40% 35% at 80% 80%, rgba(255,144,0,.06), transparent 60%);
  z-index: 10;
  pointer-events: none;
}
.link-card:hover {
  background-color: #2a2a2a;
  transform: translateY(-3px);
  box-shadow: 12px 12px 28px rgba(0,0,0,.55), -12px -12px 28px rgba(255,255,255,.07);
}
.link-card:active,
.link-card:has(a:active) {
  transform: translateY(0);
  box-shadow: var(--neu-in);
}

.link-card a {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  text-decoration: none;
  z-index: 12;
  display: block;
}

/* Hover 优化：避免整块变黑，采用柔和提亮与高光，而非深色覆盖 */
.link-card:hover {
  /* 不再用纯深色背景，改为细微提亮 + 光泽 */
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(0, 0, 0, 0) 45%),
    var(--card-bg-color);
  transform: translateY(-2px);
  /* 提升但保持柔和的外阴影 */
  box-shadow:
    8px 10px 22px rgba(0, 0, 0, 0.35),
    -8px -10px 22px rgba(255, 255, 255, 0.06);
}

.link-card i {
  font-size: 1.8rem;
  margin-bottom: 0.7rem;
  color: var(--primary-color);
  transition: transform 0.2s ease;
  position: relative;
  z-index: 11;
}

.link-card:hover i {
  transform: scale(1.1);
}

.link-card h3 {
  font-size: 0.9rem;
  margin: 0;
  color: var(--text-color);
  line-height: 1.3;
  font-weight: 500;
  max-width: 100%;
  height: 2.6em;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  text-overflow: ellipsis;
  white-space: normal;
  padding: 0 0.3rem;
  position: relative;
  z-index: 11;
}

footer {
  background: transparent;
  color: #b9bcc2;
  text-align: center;
  padding: 1rem;
  font-size: 0.75rem;
}

footer nav {
  margin-top: 0.6rem;
  background-color: transparent;
}

footer nav a {
  color: #b9bcc2;
  margin: 0 0.6rem;
  font-size: 0.75rem;
  display: inline-block;
  padding: 0.35rem 0.6rem;
  border-radius: 9999px;
  background: var(--card-bg-color);
  box-shadow: var(--neu-out);
  transition: box-shadow var(--transition-fast,180ms) ease, transform var(--transition-fast,180ms) ease;
}
footer nav a:hover {
  transform: translateY(-1px);
  box-shadow: 6px 6px 14px rgba(0,0,0,.45), -6px -6px 14px rgba(255,255,255,.07);
}
footer nav a:focus-visible {
  outline: none;
  box-shadow: var(--neu-out), 0 0 0 2px rgba(255,144,0,.35);
}

/* 响应式 */
@media (max-width: 1200px) {
  :root {
    --container-max: 95vw; /* 保持与 main 的视觉对齐 */
  }
  main {
    padding: 1rem;
    max-width: var(--container-max);
  }
  .link-grid {
    grid-template-columns: repeat(auto-fill, minmax(8rem, 1fr));
    gap: 1rem;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  main {
    padding: 0.8rem;
  }

  .link-grid {
    grid-template-columns: repeat(auto-fill, minmax(7rem, 1fr));
    gap: 0.8rem;
  }

  nav {
    padding: 0.4rem;
    justify-content: center; /* 小屏也保持居中 */
  }

  nav a {
    padding: 0.4rem 0.7rem;
    font-size: 0.95rem;
  }

  .category-title {
    font-size: 1.4rem;
    margin: 1.8rem 0 1rem;
  }

  .link-card {
    padding: 1rem 0.6rem;
    min-height: 80px;
  }

  .link-card i {
    font-size: 1.6rem;
    margin-bottom: 0.5rem;
  }

  .link-card h3 {
    font-size: 0.8rem;
    height: 2.4em;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  main {
    padding: 0.6rem;
  }

  .link-grid {
    grid-template-columns: repeat(auto-fill, minmax(6rem, 1fr));
    gap: 0.7rem;
  }

  header h1 {
    font-size: 1.6rem;
  }

  nav li {
    margin: 0.25rem;
  }

  nav a {
    padding: 0.35rem 0.6rem;
    font-size: 0.9rem;
  }

  .category-title {
    font-size: 1.4rem;
    margin: 1.8rem 0 1rem;
  }

  .link-card {
    padding: 0.8rem 0.5rem;
    min-height: 70px;
  }

  .link-card i {
    font-size: 1.4rem;
    margin-bottom: 0.4rem;
  }

  .link-card h3 {
    font-size: 0.75rem;
    padding: 0 0.2rem;
    height: 2.4em;
  }

  footer {
    padding: 0.8rem;
  }

  footer nav a {
    margin: 0 0.4rem;
    font-size: 0.7rem;
  }
}

@media (max-width: 360px) {
  html {
    font-size: 13px;
  }

  .link-grid {
    grid-template-columns: repeat(auto-fill, minmax(5.5rem, 1fr));
    gap: 0.6rem;
  }

  header h1 {
    font-size: 1.4rem;
  }

  .link-card {
    padding: 0.8rem 0.5rem;
    min-height: 70px;
  }

  .link-card i {
    font-size: 1.3rem;
    margin-bottom: 0.3rem;
  }

  .link-card h3 {
    font-size: 0.7rem;
    padding: 0 0.15rem;
    height: 2.2em;
  }
}
/* ===========================
   Neumorphism (Soft UI) — overrides and enhancements
   特点：柔和外阴影、内阴影、哑光材质、微妙层次
   =========================== */

:root {
  /* 合并基准变量，避免重复与冲突 */
  --bg-color: #0e0f13;
  --card-bg-color: #151823;
  --text-color: #e8e8ea;
  --primary-color: #ff9000;

  --neu-shadow-distance: 10px;
  --neu-shadow-blur: 22px;
  --neu-light: rgba(255,255,255,0.08);
  --neu-dark: rgba(0,0,0,0.55);

  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --transition-fast: 180ms;
  --transition-slow: 280ms;

  --neu-out:  var(--neu-shadow-distance) var(--neu-shadow-distance) var(--neu-shadow-blur) var(--neu-dark),
              calc(var(--neu-shadow-distance) * -1) calc(var(--neu-shadow-distance) * -1) var(--neu-shadow-blur) var(--neu-light);
  --neu-in:   inset var(--neu-shadow-distance) var(--neu-shadow-distance) var(--neu-shadow-blur) var(--neu-dark),
              inset calc(var(--neu-shadow-distance) * -1) calc(var(--neu-shadow-distance) * -1) var(--neu-shadow-blur) var(--neu-light);
}

/* 背景加入微弱体感渐变与质感噪点（软质感） */
body {
  background:
    radial-gradient(1200px 800px at 20% 0%, rgba(255, 255, 255, 0.03), transparent 60%),
    radial-gradient(1000px 600px at 100% 100%, rgba(255, 144, 0, 0.04), transparent 60%),
    var(--bg-color);
  color: var(--text-color);
}

/* Header 文案微浮雕（Embossed） */
header {
  background: transparent;
}
header h1 {
  text-shadow:
    1px 1px 0 rgba(0, 0, 0, 0.25),
    -1px -1px 0 rgba(255, 255, 255, 0.03);
  letter-spacing: 0.5px;
}

/* 顶部导航采用“胶囊 + 新拟物” */
nav {
  background: transparent;
  padding: 0.75rem 0;
}
nav ul {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.5rem;
  margin: 0 auto;
  width: max-content;
  background: var(--card-bg-color);
  border-radius: 9999px;
  box-shadow: var(--neu-out);
}
nav li {
  margin: 0;                   /* 由 gap 控制 */
}
nav a {
  display: inline-block;
  color: var(--text-color);
  text-decoration: none;
  padding: 0.5rem 0.9rem;
  font-weight: 600;
  border-radius: 9999px;
  background: var(--card-bg-color);
  box-shadow: var(--neu-out);
  transition: box-shadow var(--transition-fast) ease, transform var(--transition-fast) ease, color var(--transition-fast) ease, background var(--transition-fast) ease;
  will-change: transform, box-shadow;
}
nav a:hover {
  transform: translateY(-1px);
  box-shadow:
    6px 6px 14px rgba(0, 0, 0, 0.45),
    -6px -6px 14px rgba(255, 255, 255, 0.07);
}
nav a.active {
  color: #000;
  background: linear-gradient(145deg, rgba(255, 144, 0, 0.95), rgba(255, 144, 0, 0.85));
  box-shadow: var(--neu-in);
}
nav a:focus-visible {
  outline: none;
  box-shadow:
    var(--neu-out),
    0 0 0 2px rgba(255, 144, 0, 0.45);
}

/* 分类标题采用浮雕文字体感，弱化硬边框 */
.category-title {
  border-left: none;
  padding-left: 0.2rem;
  letter-spacing: 0.3px;
  text-shadow:
    1px 1px 0 rgba(0, 0, 0, 0.35),
    -1px -1px 0 rgba(255, 255, 255, 0.04);
  position: relative;
}
.category-title::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-left: 8px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(255, 144, 0, 0.9), rgba(255, 144, 0, 0.25));
  box-shadow:
    2px 2px 4px rgba(0, 0, 0, 0.35),
    -2px -2px 4px rgba(255, 255, 255, 0.04);
  vertical-align: middle;
}

/* 卡片采用“软凸起 + 悬浮微动” */
.link-grid {
  gap: 1.1rem;
}
.link-card {
  background: var(--card-bg-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--neu-out);
  transition: transform var(--transition-fast) ease, box-shadow var(--transition-fast) ease, background var(--transition-fast) ease;
}

/* 光泽高光（Matte with soft highlight） */
.link-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(65% 55% at 30% 25%, rgba(255, 255, 255, 0.05), transparent 60%),
    radial-gradient(40% 35% at 80% 80%, rgba(255, 144, 0, 0.06), transparent 60%);
  z-index: 10;
  pointer-events: none;
}
.link-card:hover {
  transform: translateY(-3px);
  box-shadow:
    12px 12px 28px rgba(0, 0, 0, 0.55),
    -12px -12px 28px rgba(255, 255, 255, 0.07);
}

/* 按压态（Pressed/Concave）— 支持现代浏览器 :has，提供 :active 退化 */
.link-card:active,
.link-card:has(a:active) {
  transform: translateY(0);
  box-shadow: var(--neu-in);
}

/* 图标“软 3D”质感 */
.link-card i {
  color: var(--primary-color);
  text-shadow:
    1px 1px 0 rgba(0, 0, 0, 0.25),
    -1px -1px 0 rgba(255, 255, 255, 0.06);
}

/* 文案层次稍显浮起 */
.link-card h3 {
  text-shadow:
    0.5px 0.5px 0 rgba(0, 0, 0, 0.25),
    -0.5px -0.5px 0 rgba(255, 255, 255, 0.03);
}

/* 键盘可达性：卡片聚焦环（tactile focus ring） */
.link-card:focus-within {
  outline: none;
  box-shadow:
    var(--neu-out),
    0 0 0 2px rgba(255, 144, 0, 0.35);
}

/* Footer 软容器 */
footer {
  background: transparent;
  color: #b9bcc2;
}
footer nav {
  background: transparent;
}
footer nav a {
  display: inline-block;
  padding: 0.35rem 0.6rem;
  border-radius: 9999px;
  background: var(--card-bg-color);
  box-shadow: var(--neu-out);
  transition: box-shadow var(--transition-fast) ease, transform var(--transition-fast) ease;
}
footer nav a:hover {
  transform: translateY(-1px);
  box-shadow:
    6px 6px 14px rgba(0, 0, 0, 0.45),
    -6px -6px 14px rgba(255, 255, 255, 0.07);
}
footer nav a:focus-visible {
  outline: none;
  box-shadow:
    var(--neu-out),
    0 0 0 2px rgba(255, 144, 0, 0.35);
}

/* 触感过渡（减少动态偏好） */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

/* 响应式：缩短阴影距离以维持柔和比例 */
@media (max-width: 768px) {
  :root {
    --neu-shadow-distance: 8px;
    --neu-shadow-blur: 18px;
  }
  nav a {
    padding: 0.45rem 0.8rem;
  }
}

@media (max-width: 480px) {
  :root {
    --neu-shadow-distance: 6px;
    --neu-shadow-blur: 14px;
  }
  nav ul {
    padding: 0.4rem;
    gap: 0.3rem;
  }
  nav a {
    padding: 0.4rem 0.7rem;
  }
  .link-card {
    border-radius: var(--radius-md);
  }
}

@media (max-width: 360px) {
  :root {
    --neu-shadow-distance: 5px;
    --neu-shadow-blur: 12px;
  }
}
/* ===========================
   Neumorphism (Soft UI) — final override layer
   将此区块置于文件末尾以覆盖先前基础样式
   =========================== */

:root {
  /* 新拟物化配色与变量（末尾声明以覆盖上方定义） */
  --bg-color: #0e0f13;
  --card-bg-color: #151823;
  --text-color: #e8e8ea;
  --primary-color: #ff9000;

  /* 容器对齐变量（与 main 对齐，确保导航视觉居中基线） */
  --container-max: 1200px;
  --container-pad: 1rem;

  /* 阴影系统（双向光源） */
  --neu-shadow-distance: 10px;
  --neu-shadow-blur: 22px;
  --neu-light: rgba(255, 255, 255, 0.08);
  --neu-dark: rgba(0, 0, 0, 0.55);

  /* 圆角与动效 */
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --transition-fast: 180ms;
  --transition-slow: 280ms;

  /* 组合阴影（复用） */
  --neu-out:  var(--neu-shadow-distance) var(--neu-shadow-distance) var(--neu-shadow-blur) var(--neu-dark),
              calc(var(--neu-shadow-distance) * -1) calc(var(--neu-shadow-distance) * -1) var(--neu-shadow-blur) var(--neu-light);
  --neu-in:   inset var(--neu-shadow-distance) var(--neu-shadow-distance) var(--neu-shadow-blur) var(--neu-dark),
              inset calc(var(--neu-shadow-distance) * -1) calc(var(--neu-shadow-distance) * -1) var(--neu-shadow-blur) var(--neu-light);
}

/* 背景与质感 */
body {
  background:
    radial-gradient(1200px 800px at 20% 0%, rgba(255, 255, 255, 0.03), transparent 60%),
    radial-gradient(1000px 600px at 100% 100%, rgba(255, 144, 0, 0.04), transparent 60%),
    var(--bg-color);
  color: var(--text-color);
}

/* Header 轻浮雕 */
header {
  background: transparent;
}
header h1 {
  text-shadow:
    1px 1px 0 rgba(0, 0, 0, 0.25),
    -1px -1px 0 rgba(255, 255, 255, 0.03);
  letter-spacing: 0.5px;
}

/* 顶部导航胶囊 + 新拟物（最终覆盖并固定居中策略） */
nav {
  background: transparent;
  padding: 0.75rem 0;
  width: 100%;
  display: flex;
  justify-content: center;
}
nav .nav-wrap {
  max-width: var(--container-max);
  width: 100%;
  padding: 0 var(--container-pad);
  margin: 0 auto;
  display: flex;
  justify-content: center;
  text-align: center; /* 兜底使 inline 盒在中线渲染 */
}
nav ul {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.5rem;
  margin: 0 auto;
  width: max-content; /* 胶囊自适应内容宽度 */
  background: var(--card-bg-color);
  border-radius: 9999px;
  box-shadow: var(--neu-out);
}
nav li {
  margin: 0; /* 由 gap 控制 */
}
nav a {
  display: inline-block;
  color: var(--text-color);
  text-decoration: none;
  padding: 0.5rem 0.9rem;
  font-weight: 600;
  border-radius: 9999px;
  background: var(--card-bg-color);
  box-shadow: var(--neu-out);
  transition: box-shadow var(--transition-fast) ease, transform var(--transition-fast) ease, color var(--transition-fast) ease, background var(--transition-fast) ease;
  will-change: transform, box-shadow;
}
nav a:hover {
  transform: translateY(-1px);
  box-shadow:
    6px 6px 14px rgba(0, 0, 0, 0.45),
    -6px -6px 14px rgba(255, 255, 255, 0.07);
}
nav a.active {
  color: #000;
  background: linear-gradient(145deg, rgba(255, 144, 0, 0.95), rgba(255, 144, 0, 0.85));
  box-shadow: var(--neu-in);
}
nav a:focus-visible {
  outline: none;
  box-shadow:
    var(--neu-out),
    0 0 0 2px rgba(255, 144, 0, 0.45);
}

/* 分类标题浮雕层次 */
.category-title {
  border-left: none;
  padding-left: 0.2rem;
  letter-spacing: 0.3px;
  text-shadow:
    1px 1px 0 rgba(0, 0, 0, 0.35),
    -1px -1px 0 rgba(255, 255, 255, 0.04);
  position: relative;
}
.category-title::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-left: 8px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(255, 144, 0, 0.9), rgba(255, 144, 0, 0.25));
  box-shadow:
    2px 2px 4px rgba(0, 0, 0, 0.35),
    -2px -2px 4px rgba(255, 255, 255, 0.04);
  vertical-align: middle;
}

/* 卡片：软凸起、光泽与按压态 */
.link-grid {
  gap: 1.1rem;
}
.link-card {
  background: var(--card-bg-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--neu-out);
  transition: transform var(--transition-fast) ease, box-shadow var(--transition-fast) ease, background var(--transition-fast) ease;
}
.link-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(65% 55% at 30% 25%, rgba(255, 255, 255, 0.05), transparent 60%),
    radial-gradient(40% 35% at 80% 80%, rgba(255, 144, 0, 0.06), transparent 60%);
  z-index: 10;
  pointer-events: none;
}
.link-card:hover {
  transform: translateY(-3px);
  box-shadow:
    12px 12px 28px rgba(0, 0, 0, 0.55),
    -12px -12px 28px rgba(255, 255, 255, 0.07);
}
.link-card:active,
.link-card:has(a:active) {
  transform: translateY(0);
  box-shadow: var(--neu-in);
}

/* 图标 Soft 3D 与文案浮起 */
.link-card i {
  color: var(--primary-color);
  text-shadow:
    1px 1px 0 rgba(0, 0, 0, 0.25),
    -1px -1px 0 rgba(255, 255, 255, 0.06);
}
.link-card h3 {
  text-shadow:
    0.5px 0.5px 0 rgba(0, 0, 0, 0.25),
    -0.5px -0.5px 0 rgba(255, 255, 255, 0.03);
}

/* 键盘可达性：卡片聚焦环 */
.link-card:focus-within {
  outline: none;
  box-shadow:
    var(--neu-out),
    0 0 0 2px rgba(255, 144, 0, 0.35);
}

/* Footer 软容器与链接胶囊 */
footer {
  background: transparent;
  color: #b9bcc2;
}
footer nav {
  background: transparent;
}
footer nav a {
  display: inline-block;
  padding: 0.35rem 0.6rem;
  border-radius: 9999px;
  background: var(--card-bg-color);
  box-shadow: var(--neu-out);
  transition: box-shadow var(--transition-fast) ease, transform var(--transition-fast) ease;
}
footer nav a:hover {
  transform: translateY(-1px);
  box-shadow:
    6px 6px 14px rgba(0, 0, 0, 0.45),
    -6px -6px 14px rgba(255, 255, 255, 0.07);
}
footer nav a:focus-visible {
  outline: none;
  box-shadow:
    var(--neu-out),
    0 0 0 2px rgba(255, 144, 0, 0.35);
}

/* 触感过渡（减少动态偏好） */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

/* 响应式：缩短阴影距离以维持柔和比例 + 容器对齐同步 */
@media (max-width: 1200px) {
  :root {
    --container-max: 95vw; /* 与 main 视觉一致 */
  }
}
@media (max-width: 768px) {
  :root {
    --neu-shadow-distance: 8px;
    --neu-shadow-blur: 18px;
  }
  nav {
    justify-content: center;
  }
  nav a {
    padding: 0.45rem 0.8rem;
  }
}
@media (max-width: 480px) {
  :root {
    --neu-shadow-distance: 6px;
    --neu-shadow-blur: 14px;
  }
  nav ul {
    padding: 0.4rem;
    gap: 0.3rem;
  }
  nav a {
    padding: 0.4rem 0.7rem;
  }
  .link-card {
    border-radius: var(--radius-md);
  }
}
@media (max-width: 360px) {
  :root {
    --neu-shadow-distance: 5px;
    --neu-shadow-blur: 12px;
  }
}
/* =========================================
   Neumorphism Prompt-based Visual Upgrades
   Core: Neumorphism / Soft UI / Claymorphism / Minimalist 3D
   Visuals: soft/diffuse shadows, inner/outer shadows, embossed/beveled
   Texture: matte finish, soft plastic, tactile interface
   Palette: monochrome, low-contrast subtle differences, soft lighting
   ========================================= */

:root {
  /* Tactile/texture helpers (Dark mode baseline) */
  --surface-tint: rgba(255, 255, 255, 0.035);
  --edge-light: rgba(255, 255, 255, 0.08);
  --edge-shadow: rgba(0, 0, 0, 0.38);
  --border-soft: rgba(255, 255, 255, 0.06);
  --ambient-glow: rgba(255, 144, 0, 0.12);
  color-scheme: dark;
}

/* Claymorphism surfaces: soft plastic + matte finish with beveled edges */
nav ul {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(0, 0, 0, 0) 42%),
    var(--card-bg-color);
  border: 1px solid var(--border-soft);
  box-shadow:
    var(--neu-out),
    inset 0 1px 0 var(--edge-light),
    inset 0 -1px 0 rgba(0, 0, 0, 0.20);
}

/* Pills: subtle extruded top highlight */
nav a {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(0, 0, 0, 0) 50%),
    var(--card-bg-color);
}

/* Hover: ambient soft lighting ring (tactile) */
nav a:hover {
  box-shadow:
    6px 6px 14px rgba(0, 0, 0, 0.45),
    -6px -6px 14px rgba(255, 255, 255, 0.07),
    0 0 0 3px var(--ambient-glow);
}

/* Pressed/Concave + glow hint for active */
nav a.active {
  box-shadow:
    var(--neu-in),
    0 0 0 3px rgba(255, 144, 0, 0.22);
}

/* Cards: extruded + beveled with matte sheen */
.link-card {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(0, 0, 0, 0) 45%),
    var(--card-bg-color);
  border: 1px solid var(--border-soft);
  box-shadow:
    var(--neu-out),
    inset 0 1px 0 var(--edge-light),
    inset 0 -1px 0 rgba(0, 0, 0, 0.22);
}

/* Ambient top-left soft lighting */
.link-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(140% 120% at 18% 10%, rgba(255, 255, 255, 0.03), transparent 60%);
  pointer-events: none;
  z-index: 10;
}

/* Minimalist 3D icons: soft 3D with diffuse drop shadow */
.link-card i {
  filter:
    drop-shadow(0 1px 0 var(--edge-light))
    drop-shadow(6px 8px 16px rgba(0, 0, 0, 0.25));
}

/* Icons inside pills (if present) */
nav a i {
  margin-right: 0.25rem;
  filter:
    drop-shadow(0 1px 0 var(--edge-light))
    drop-shadow(4px 6px 12px rgba(0, 0, 0, 0.20));
}

/* Monochromatic + low-contrast subtle differences: light mode support */
@media (prefers-color-scheme: light) {
  :root {
    --bg-color: #f3f5f7;
    --card-bg-color: #ffffff;
    --text-color: #1b1f24;
    --neu-light: rgba(255, 255, 255, 0.75);
    --neu-dark: rgba(0, 0, 0, 0.18);
    --surface-tint: rgba(0, 0, 0, 0.03);
    --border-soft: rgba(0, 0, 0, 0.06);
    --ambient-glow: rgba(255, 144, 0, 0.10);
    color-scheme: light;

    /* Rebuild shadow tokens for light ambiance */
    --neu-out:  var(--neu-shadow-distance) var(--neu-shadow-distance) var(--neu-shadow-blur) var(--neu-dark),
                calc(var(--neu-shadow-distance) * -1) calc(var(--neu-shadow-distance) * -1) var(--neu-shadow-blur) var(--neu-light);
    --neu-in:   inset var(--neu-shadow-distance) var(--neu-shadow-distance) var(--neu-shadow-blur) var(--neu-dark),
                inset calc(var(--neu-shadow-distance) * -1) calc(var(--neu-shadow-distance) * -1) var(--neu-shadow-blur) var(--neu-light);
  }

  nav ul,
  .link-card,
  nav a {
    background:
      linear-gradient(180deg, rgba(0, 0, 0, 0.02), rgba(0, 0, 0, 0) 45%),
      var(--card-bg-color);
    border: 1px solid var(--border-soft);
  }
}

/* Optional manual override: force light theme */
:root[data-theme="light"] {
  --bg-color: #f3f5f7;
  --card-bg-color: #ffffff;
  --text-color: #1b1f24;
  --neu-light: rgba(255, 255, 255, 0.75);
  --neu-dark: rgba(0, 0, 0, 0.18);
  --surface-tint: rgba(0, 0, 0, 0.03);
  --border-soft: rgba(0, 0, 0, 0.06);
  --ambient-glow: rgba(255, 144, 0, 0.10);
  color-scheme: light;

  --neu-out:  var(--neu-shadow-distance) var(--neu-shadow-distance) var(--neu-shadow-blur) var(--neu-dark),
              calc(var(--neu-shadow-distance) * -1) calc(var(--neu-shadow-distance) * -1) var(--neu-shadow-blur) var(--neu-light);
  --neu-in:   inset var(--neu-shadow-distance) var(--neu-shadow-distance) var(--neu-shadow-blur) var(--neu-dark),
              inset calc(var(--neu-shadow-distance) * -1) calc(var(--neu-shadow-distance) * -1) var(--neu-shadow-blur) var(--neu-light);
}