:root {
  --lemon-primary: #f5a623;
  --lemon-primary-dark: #d98c0f;
  --lemon-primary-light: #ffc85c;
  --lemon-accent: #6c5ce7;
  --lemon-accent-light: #a29bfe;
  --lemon-bg: #fdfaf3;
  --lemon-bg-alt: #fff8e7;
  --lemon-surface: #ffffff;
  --lemon-surface-glass: rgba(255, 255, 255, 0.72);
  --lemon-text: #1f1a12;
  --lemon-text-secondary: #5c5445;
  --lemon-text-muted: #8a8170;
  --lemon-border: rgba(245, 166, 35, 0.18);
  --lemon-shadow-sm: 0 2px 8px rgba(31, 26, 18, 0.06);
  --lemon-shadow-md: 0 8px 28px rgba(31, 26, 18, 0.1);
  --lemon-shadow-lg: 0 18px 48px rgba(31, 26, 18, 0.14);
  --lemon-gradient-hero: linear-gradient(135deg, #f5a623 0%, #ff8a3d 42%, #6c5ce7 100%);
  --lemon-gradient-soft: linear-gradient(135deg, rgba(245, 166, 35, 0.14) 0%, rgba(108, 92, 231, 0.12) 100%);
  --lemon-radius-sm: 10px;
  --lemon-radius-md: 18px;
  --lemon-radius-lg: 28px;
  --lemon-radius-pill: 999px;
  --lemon-blur: 16px;
  --lemon-max-width: 1180px;
  --lemon-transition: 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
  --lemon-font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --lemon-bg: #14110c;
    --lemon-bg-alt: #1c1810;
    --lemon-surface: #211c14;
    --lemon-surface-glass: rgba(33, 28, 20, 0.72);
    --lemon-text: #f6f1e6;
    --lemon-text-secondary: #c9c0ad;
    --lemon-text-muted: #948a76;
    --lemon-border: rgba(245, 166, 35, 0.22);
    --lemon-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --lemon-shadow-md: 0 8px 28px rgba(0, 0, 0, 0.5);
    --lemon-shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
    --lemon-gradient-hero: linear-gradient(135deg, #b8740f 0%, #c25a1d 42%, #4b3fc0 100%);
    --lemon-gradient-soft: linear-gradient(135deg, rgba(245, 166, 35, 0.16) 0%, rgba(108, 92, 231, 0.18) 100%);
  }
}

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

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--lemon-font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--lemon-text);
  background-color: var(--lemon-bg);
  background-image:
    radial-gradient(1100px 520px at 12% -8%, rgba(245, 166, 35, 0.16), transparent 62%),
    radial-gradient(900px 480px at 92% 4%, rgba(108, 92, 231, 0.14), transparent 60%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--lemon-transition), color var(--lemon-transition);
}

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

a {
  color: var(--lemon-primary-dark);
  text-decoration: none;
  transition: color var(--lemon-transition), opacity var(--lemon-transition);
}

a:hover,
a:focus-visible {
  color: var(--lemon-accent);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--lemon-accent-light);
  outline-offset: 2px;
  border-radius: 4px;
}

ul,
ol {
  padding-left: 1.35em;
}

li {
  margin-bottom: 0.4em;
}

::selection {
  background: rgba(245, 166, 35, 0.35);
  color: var(--lemon-text);
}

/* ============ 滚动条 ============ */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--lemon-primary), var(--lemon-accent));
  border-radius: var(--lemon-radius-pill);
  border: 2px solid transparent;
  background-clip: padding-box;
}

/* ============ 头部导航 ============ */
header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(var(--lemon-blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--lemon-blur)) saturate(160%);
  background: var(--lemon-surface-glass);
  border-bottom: 1px solid var(--lemon-border);
  box-shadow: var(--lemon-shadow-sm);
  transition: background var(--lemon-transition), box-shadow var(--lemon-transition);
}

header[role="banner"] nav {
  max-width: var(--lemon-max-width);
  margin: 0 auto;
  padding: 12px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

header[role="banner"] nav > div {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  width: 100%;
  justify-content: space-between;
}

header[role="banner"] nav > div > a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.18rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--lemon-text);
  padding: 6px 10px;
  border-radius: var(--lemon-radius-md);
  transition: transform var(--lemon-transition), background var(--lemon-transition);
}

header[role="banner"] nav > div > a:hover {
  transform: translateY(-2px);
  background: var(--lemon-gradient-soft);
}

header[role="banner"] nav > div > a svg {
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(245, 166, 35, 0.35);
  transition: transform var(--lemon-transition), box-shadow var(--lemon-transition);
}

header[role="banner"] nav > div > a:hover svg {
  transform: rotate(-6deg) scale(1.06);
  box-shadow: 0 10px 24px rgba(245, 166, 35, 0.5);
}

header[role="banner"] nav > div > a span {
  background: linear-gradient(120deg, var(--lemon-primary-dark), var(--lemon-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

header[role="banner"] nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}

header[role="banner"] nav ul li {
  margin: 0;
}

header[role="banner"] nav ul li a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: var(--lemon-radius-pill);
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--lemon-text-secondary);
  position: relative;
  transition: color var(--lemon-transition), background var(--lemon-transition), transform var(--lemon-transition);
}

header[role="banner"] nav ul li a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--lemon-primary), var(--lemon-accent));
  transform: translateX(-50%);
  transition: width var(--lemon-transition);
}

header[role="banner"] nav ul li a:hover {
  color: var(--lemon-text);
  background: var(--lemon-gradient-soft);
  transform: translateY(-2px);
}

header[role="banner"] nav ul li a:hover::after {
  width: 56%;
}

/* ============ 主体容器 ============ */
main {
  display: block;
}

main > article {
  max-width: var(--lemon-max-width);
  margin: 0 auto;
  padding: 0 22px 60px;
}

/* ============ 通用标题 ============ */
h1,
h2,
h3,
h4 {
  line-height: 1.35;
  color: var(--lemon-text);
  font-weight: 800;
  letter-spacing: 0.01em;
  scroll-margin-top: 100px;
}

h1 {
  font-size: clamp(1.75rem, 4.2vw, 2.9rem);
  margin: 0 0 20px;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2.05rem);
  margin: 0 0 22px;
  padding-bottom: 14px;
  position: relative;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 74px;
  height: 5px;
  border-radius: var(--lemon-radius-pill);
  background: linear-gradient(90deg, var(--lemon-primary), var(--lemon-accent));
  box-shadow: 0 4px 14px rgba(245, 166, 35, 0.4);
}

h3 {
  font-size: clamp(1.12rem, 2.2vw, 1.42rem);
  margin: 28px 0 12px;
  color: var(--lemon-primary-dark);
}

p {
  margin: 0 0 16px;
  color: var(--lemon-text-secondary);
}

strong {
  color: var(--lemon-text);
  font-weight: 700;
}

/* ============ 各区块卡片化 ============ */
main > article > section {
  position: relative;
  margin: 34px 0;
  padding: 34px clamp(20px, 3.4vw, 44px);
  background: var(--lemon-surface);
  border: 1px solid var(--lemon-border);
  border-radius: var(--lemon-radius-lg);
  box-shadow: var(--lemon-shadow-md);
  backdrop-filter: blur(var(--lemon-blur));
  -webkit-backdrop-filter: blur(var(--lemon-blur));
  overflow: hidden;
  opacity: 0;
  transform: translateY(34px);
  animation: lemonRise 0.85s cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
  transition: box-shadow var(--lemon-transition), transform var(--lemon-transition), border-color var(--lemon-transition);
}

main > article > section::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--lemon-primary), var(--lemon-accent), var(--lemon-primary));
  background-size: 200% 100%;
  animation: lemonShimmer 6s linear infinite;
  opacity: 0.85;
}

main > article > section:hover {
  box-shadow: var(--lemon-shadow-lg);
  border-color: rgba(245, 166, 35, 0.4);
}

main > article > section:nth-child(1) { animation-delay: 0.05s; }
main > article > section:nth-child(2) { animation-delay: 0.1s; }
main > article > section:nth-child(3) { animation-delay: 0.15s; }
main > article > section:nth-child(4) { animation-delay: 0.2s; }
main > article > section:nth-child(5) { animation-delay: 0.25s; }
main > article > section:nth-child(6) { animation-delay: 0.3s; }
main > article > section:nth-child(7) { animation-delay: 0.35s; }
main > article > section:nth-child(8) { animation-delay: 0.4s; }
main > article > section:nth-child(9) { animation-delay: 0.45s; }
main > article > section:nth-child(10) { animation-delay: 0.5s; }
main > article > section:nth-child(11) { animation-delay: 0.55s; }
main > article > section:nth-child(12) { animation-delay: 0.6s; }

@keyframes lemonRise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes lemonShimmer {
  0% { background-position: 0% 0; }
  100% { background-position: 200% 0; }
}

/* ============ Hero 渐变 Banner ============ */
#hero {
  margin-top: 26px;
  padding: clamp(34px, 5vw, 64px) clamp(22px, 4vw, 54px);
  border-radius: var(--lemon-radius-lg);
  background: var(--lemon-gradient-hero);
  background-size: 180% 180%;
  animation: lemonGradientFlow 14s ease infinite, lemonRise 0.85s cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
  color: #fff;
  border: none;
  box-shadow: 0 22px 60px rgba(245, 116, 35, 0.32);
  isolation: isolate;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(520px 300px at 88% 12%, rgba(255, 255, 255, 0.28), transparent 68%),
    radial-gradient(420px 260px at 6% 92%, rgba(255, 255, 255, 0.18), transparent 66%);
  z-index: -1;
  pointer-events: none;
}

#hero::after {
  display: none;
}

@keyframes lemonGradientFlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

#hero h1 {
  color: #fff;
  text-shadow: 0 4px 22px rgba(0, 0, 0, 0.22);
  margin-bottom: 22px;
}

#hero p {
  color: rgba(255, 255, 255, 0.94);
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  max-width: 900px;
}

#hero nav[aria-label="面包屑导航"] {
  margin-top: 26px;
  padding: 10px 18px;
  display: inline-block;
  border-radius: var(--lemon-radius-pill);
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.32);
}

#hero nav[aria-label="面包屑导航"] ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.92rem;
}

#hero nav[aria-label="面包屑导航"] ol li {
  margin: 0;
  color: rgba(255, 255, 255, 0.9);
  display: inline-flex;
  align-items: center;
}

#hero nav[aria-label="面包屑导航"] ol li + li::before {
  content: "›";
  margin-right: 6px;
  color: rgba(255, 255, 255, 0.7);
}

#hero nav[aria-label="面包屑导航"] ol li a {
  color: #fff;
  font-weight: 600;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.55);
}

#hero nav[aria-label="面包屑导航"] ol li a:hover {
  color: #fff5d6;
  border-bottom-color: #fff5d6;
}

#hero nav[aria-label="面包屑导航"] ol li[aria-current="page"] {
  font-weight: 700;
  color: #fff8e7;
}

/* ============ 列表样式优化 ============ */
#products ul,
#howto ul,
#howto ol,
#sitemap ul,
#links ul {
  list-style: none;
  padding-left: 0;
  margin: 18px 0;
  display: grid;
  gap: 10px;
}

#products ul li,
#howto ul li {
  position: relative;
  padding: 12px 16px 12px 44px;
  background: var(--lemon-gradient-soft);
  border: 1px solid var(--lemon-border);
  border-radius: var(--lemon-radius-md);
  color: var(--lemon-text-secondary);
  transition: transform var(--lemon-transition), box-shadow var(--lemon-transition), background var(--lemon-transition);
}

#products ul li::before,
#howto ul li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 50%;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transform: translateY(-50%);
  background: linear-gradient(135deg, var(--lemon-primary), var(--lemon-accent));
  box-shadow: 0 0 0 4px rgba(245, 166, 35, 0.16);
}

#products ul li:hover,
#howto ul li:hover {
  transform: translateX(6px);
  box-shadow: var(--lemon-shadow-sm);
  background: var(--lemon-surface);
}

#howto ol {
  counter-reset: lemonStep;
}

#howto ol li {
  position: relative;
  counter-increment: lemonStep;
  padding: 16px 18px 16px 62px;
  background: var(--lemon-surface);
  border: 1px solid var(--lemon-border);
  border-radius: var(--lemon-radius-md);
  color: var(--lemon-text-secondary);
  box-shadow: var(--lemon-shadow-sm);
  transition: transform var(--lemon-transition), box-shadow var(--lemon-transition), border-color var(--lemon-transition);
}

#howto ol li::before {
  content: counter(lemonStep);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-weight: 800;
  font-size: 0.92rem;
  color: #fff;
  background: linear-gradient(135deg, var(--lemon-primary), var(--lemon-accent));
  box-shadow: 0 6px 16px rgba(245, 166, 35, 0.4);
}

#howto ol li:hover {
  transform: translateY(-3px);
  box-shadow: var(--lemon-shadow-md);
  border-color: rgba(245, 166, 35, 0.42);
}

/* ============ 引用块 ============ */
blockquote {
  margin: 18px 0;
  padding: 20px 24px 20px 26px;
  border-radius: var(--lemon-radius-md);
  background: var(--lemon-gradient-soft);
  border-left: 5px solid var(--lemon-primary);
  box-shadow: var(--lemon-shadow-sm);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform var(--lemon-transition), box-shadow var(--lemon-transition);
}

blockquote:hover {
  transform: translateY(-3px);
  box-shadow: var(--lemon-shadow-md);
}

blockquote p {
  margin: 0;
  font-style: italic;
  color: var(--lemon-text);
  font-size: 1.02rem;
}

/* ============ 作品库卡片 ============ */
#library h3 {
  padding: 18px 20px 18px 24px;
  border-radius: var(--lemon-radius-md);
  background: var(--lemon-surface);
  border: 1px solid var(--lemon-border);
  box-shadow: var(--lemon-shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--lemon-transition), box-shadow var(--lemon-transition), color var(--lemon-transition);
}

#library h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: linear-gradient(180deg, var(--lemon-primary), var(--lemon-accent));
}

#library h3:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--lemon-shadow-md);
  color: var(--lemon-accent);
}

#library p {
  padding-left: 4px;
}

/* ============ 新闻与文章卡片 ============ */
#news article,
#articles article {
  position: relative;
  margin: 16px 0;
  padding: 22px 24px;
  border-radius: var(--lemon-radius-md);
  background: var(--lemon-surface);
  border: 1px solid var(--lemon-border);
  box-shadow: var(--lemon-shadow-sm);
  transition: transform var(--lemon-transition), box-shadow var(--lemon-transition), border-color var(--lemon-transition), background var(--lemon-transition);
  overflow: hidden;
}

#news article::after,
#articles article::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: var(--lemon-gradient-soft);
  opacity: 0;
  transition: opacity var(--lemon-transition), transform var(--lemon-transition);
}

#news article:hover,
#articles article:hover {
  transform: translateY(-6px);
  box-shadow: var(--lemon-shadow-lg);
  border-color: rgba(245, 166, 35, 0.42);
}

#news article:hover::after,
#articles article:hover::after {
  opacity: 1;
  transform: scale(1.15);
}

#news article h3,
#articles article h3 {
  margin-top: 0;
  color: var(--lemon-text);
  position: relative;
  z-index: 1;
}

#news article time,
#articles article time {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 12px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--lemon-primary-dark);
  background: var(--lemon-gradient-soft);
  border-radius: var(--lemon-radius-pill);
  border: 1px solid var(--lemon-border);
}

#articles article p {
  position: relative;
  z-index: 1;
}

#articles article p a {
  display: inline-block;
  margin-top: 4px;
  font-weight: 700;
  color: var(--lemon-accent);
  position: relative;
  padding-right: 18px;
}

#articles article p a::after {
  content: "→";
  position: absolute;
  right: 0;
  transition: transform var(--lemon-transition);
}

#articles article p a:hover::after {
  transform: translateX(5px);
}

/* ============ FAQ 手风琴观感 ============ */
#faq h3 {
  margin: 16px 0 8px;
  padding: 16px 20px;
  border-radius: var(--lemon-radius-md) var(--lemon-radius-md) 0 0;
  background: var(--lemon-gradient-soft);
  border: 1px solid var(--lemon-border);
  border-bottom: none;
  color: var(--lemon-text);
  font-size: 1.06rem;
  transition: color var(--lemon-transition), background var(--lemon-transition);
}

#faq h3:hover {
  color: var(--lemon-primary-dark);
}

#faq h3 + p {
  margin: 0 0 6px;
  padding: 16px 20px;
  border-radius: 0 0 var(--lemon-radius-md) var(--lemon-radius-md);
  background: var(--lemon-surface);
  border: 1px solid var(--lemon-border);
  border-top: none;
  box-shadow: var(--lemon-shadow-sm);
  transition: box-shadow var(--lemon-transition), transform var(--lemon-transition);
}

#faq h3 + p:hover {
  box-shadow: var(--lemon-shadow-md);
}

/* ============ 联系信息 ============ */
#contact p {
  padding: 10px 16px;
  margin: 0 0 8px;
  border-radius: var(--lemon-radius-sm);
  background: var(--lemon-gradient-soft);
  border-left: 4px solid var(--lemon-primary);
  transition: transform var(--lemon-transition), background var(--lemon-transition);
}

#contact p:hover {
  transform: translateX(6px);
  background: var(--lemon-surface);
  box-shadow: var(--lemon-shadow-sm);
}

/* ============ 站点地图与友情链接 ============ */
#sitemap ul,
#links ul {
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
}

#sitemap ul li,
#links ul li {
  margin: 0;
}

#sitemap ul li a,
#links ul li a {
  display: block;
  padding: 12px 16px;
  border-radius: var(--lemon-radius-md);
  background: var(--lemon-surface);
  border: 1px solid var(--lemon-border);
  box-shadow: var(--lemon-shadow-sm);
  font-weight: 600;
  color: var(--lemon-text-secondary);
  position: relative;
  overflow: hidden;
  transition: transform var(--lemon-transition), box-shadow var(--lemon-transition), color var(--lemon-transition), background var(--lemon-transition);
}

#sitemap ul li a::before,
#links ul li a::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--lemon-gradient-soft);
  opacity: 0;
  transition: opacity var(--lemon-transition);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  transform: translateY(-4px);
  color: var(--lemon-primary-dark);
  box-shadow: var(--lemon-shadow-md);
  border-color: rgba(245, 166, 35, 0.45);
}

#sitemap ul li a:hover::before,
#links ul li a:hover::before {
  opacity: 1;
}

/* ============ 法律与页面信息 ============ */
#legal h2 {
  font-size: 1.3rem;
  margin-top: 26px;
}

#legal h2::after {
  width: 48px;
  height: 4px;
}

#meta {
  background: var(--lemon-gradient-soft);
}

#meta p {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 8px;
  font-size: 0.94rem;
}

/* ============ 页脚 ============ */
footer[role="contentinfo"] {
  position: relative;
  margin-top: 40px;
  padding: 44px 22px 34px;
  background: linear-gradient(180deg, transparent, rgba(245, 166, 35, 0.08) 30%, rgba(108, 92, 231, 0.1));
  border-top: 1px solid var(--lemon-border);
  text-align: center;
  backdrop-filter: blur(var(--lemon-blur));
  -webkit-backdrop-filter: blur(var(--lemon-blur));
}

footer[role="contentinfo"] nav {
  max-width: var(--lemon-max-width);
  margin: 0 auto 22px;
}

footer[role="contentinfo"] nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

footer[role="contentinfo"] nav ul li {
  margin: 0;
}

footer[role="contentinfo"] nav ul li a {
  display: inline-block;
  padding: 8px 16px;
  border-radius: var(--lemon-radius-pill);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--lemon-text-secondary);
  border: 1px solid transparent;
  transition: color var(--lemon-transition), background var(--lemon-transition), border-color var(--lemon-transition), transform var(--lemon-transition);
}

footer[role="contentinfo"] nav ul li a:hover {
  color: var(--lemon-primary-dark);
  background: var(--lemon-surface-glass);
  border-color: var(--lemon-border);
  transform: translateY(-3px);
}

footer[role="contentinfo"] p {
  margin: 6px 0;
  font-size: 0.88rem;
  color: var(--lemon-text-muted);
  line-height: 1.7;
}

/* ============ 返回顶部按钮 ============ */
body > button[type="button"] {
  position: fixed;
  right: 22px;
  bottom: 26px;
  z-index: 120;
  padding: 12px 18px;
  font-family: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  border: none;
  border-radius: var(--lemon-radius-pill);
  background: linear-gradient(135deg, var(--lemon-primary), var(--lemon-accent));
  background-size: 180% 180%;
  box-shadow: 0 10px 26px rgba(245, 166, 35, 0.42);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform var(--lemon-transition), box-shadow var(--lemon-transition), background-position var(--lemon-transition), opacity var(--lemon-transition);
}

body > button[type="button"]:hover {
  transform: translateY(-4px) scale(1.04);
  box-shadow: 0 16px 36px rgba(245, 166, 35, 0.55);
  background-position: 100% 50%;
}

body > button[type="button"]:active {
  transform: translateY(-1px) scale(0.99);
}

/* ============ 响应式：平板 ============ */
@media (max-width: 900px) {
  header[role="banner"] nav {
    padding: 10px 16px;
  }

  header[role="banner"] nav ul {
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  header[role="banner"] nav ul::-webkit-scrollbar {
    display: none;
  }

  header[role="banner"] nav ul li a {
    white-space: nowrap;
    padding: 7px 12px;
    font-size: 0.9rem;
  }

  main > article {
    padding: 0 16px 48px;
  }

  main > article > section {
    padding: 26px 20px;
    border-radius: var(--lemon-radius-md);
    margin: 24px 0;
  }

  #hero {
    padding: 34px 22px;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
}

/* ============ 响应式：手机 ============ */
@media (max-width: 560px) {
  body {
    font-size: 15px;
    line-height: 1.7;
  }

  header[role="banner"] nav > div > a {
    font-size: 1.05rem;
  }

  header[role="banner"] nav > div > a svg {
    width: 34px;
    height: 34px;
  }

  main > article {
    padding: 0 12px 40px;
  }

  main > article > section {
    padding: 22px 16px;
    margin: 20px 0;
    border-radius: var(--lemon-radius-md);
  }

  h2 {
    margin-bottom: 18px;
    padding-bottom: 12px;
  }

  h2::after {
    width: 56px;
    height: 4px;
  }

  #hero {
    padding: 28px 18px;
    border-radius: var(--lemon-radius-md);
  }

  #hero nav[aria-label="面包屑导航"] {
    display: block;
    padding: 8px 14px;
  }

  #hero nav[aria-label="面包屑导航"] ol {
    font-size: 0.84rem;
  }

  #products ul li,
  #howto ul li {
    padding: 11px 14px 11px 38px;
  }

  #products ul li::before,
  #howto ul li::before {
    left: 14px;
    width: 10px;
    height: 10px;
  }

  #howto ol li {
    padding: 14px 14px 14px 54px;
  }

  #howto ol li::before {
    left: 12px;
    width: 28px;
    height: 28px;
    font-size: 0.84rem;
  }

  #news article,
  #articles article {
    padding: 18px 16px;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  #sitemap ul li a,
  #links ul li a {
    padding: 10px 12px;
    font-size: 0.88rem;
  }

  footer[role="contentinfo"] {
    padding: 34px 14px 28px;
  }

  footer[role="contentinfo"] nav ul {
    gap: 4px;
  }

  footer[role="contentinfo"] nav ul li a {
    padding: 7px 12px;
    font-size: 0.85rem;
  }

  body > button[type="button"] {
    right: 14px;
    bottom: 18px;
    padding: 10px 15px;
    font-size: 0.8rem;
  }
}

/* ============ 无障碍与动效偏好 ============ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  main > article > section {
    opacity: 1;
    transform: none;
  }
}

/* ============ 打印样式 ============ */
@media print {
  header[role="banner"],
  footer[role="contentinfo"],
  body > button[type="button"] {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  main > article > section {
    box-shadow: none;
    border: 1px solid #ddd;
    opacity: 1;
    transform: none;
    page-break-inside: avoid;
  }

  #hero {
    background: #f5a623;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}