:root {
  --bg: #0d0d1a;
  --bg-alt: #14142b;
  --bg-card: rgba(26, 26, 46, 0.72);
  --bg-card-solid: #1a1a2e;
  --bg-glass: rgba(255, 255, 255, 0.06);
  --bg-glass-strong: rgba(255, 255, 255, 0.1);
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.18);
  --text: #e8e8f0;
  --text-muted: #9aa5b1;
  --text-dim: #6b7280;
  --accent: #e94560;
  --accent-2: #0f3460;
  --accent-3: #533483;
  --accent-soft: rgba(233, 69, 96, 0.14);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 45%, #0f3460 100%);
  --gradient-accent: linear-gradient(135deg, #e94560 0%, #533483 100%);
  --gradient-card: linear-gradient(160deg, rgba(233, 69, 96, 0.12), rgba(83, 52, 131, 0.12));
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 24px rgba(233, 69, 96, 0.35);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;
  --blur: 16px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f6fa;
    --bg-alt: #eceef5;
    --bg-card: rgba(255, 255, 255, 0.78);
    --bg-card-solid: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.55);
    --bg-glass-strong: rgba(255, 255, 255, 0.75);
    --border: rgba(26, 26, 46, 0.1);
    --border-strong: rgba(26, 26, 46, 0.18);
    --text: #1a1a2e;
    --text-muted: #4b5563;
    --text-dim: #6b7280;
    --accent-soft: rgba(233, 69, 96, 0.1);
    --gradient-hero: linear-gradient(135deg, #e8ecf7 0%, #dde4f5 45%, #cfd9f0 100%);
    --gradient-card: linear-gradient(160deg, rgba(233, 69, 96, 0.08), rgba(83, 52, 131, 0.08));
    --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.08);
    --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.12);
    --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.16);
    --shadow-glow: 0 0 24px rgba(233, 69, 96, 0.22);
  }
}

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

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

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(233, 69, 96, 0.1), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(83, 52, 131, 0.14), transparent 46%),
    radial-gradient(circle at 50% 100%, rgba(15, 52, 96, 0.2), transparent 55%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

a:hover,
a:focus-visible {
  color: var(--accent);
  opacity: 0.82;
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

h1, h2, h3, h4, h5, h6 {
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2.2vw, 1.4rem); }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

ul, ol {
  padding-left: 1.4rem;
  margin-bottom: 1rem;
}

li { margin-bottom: 0.5rem; }

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

blockquote {
  position: relative;
  padding: 1.1rem 1.4rem 1.1rem 2.6rem;
  margin: 1rem 0;
  background: var(--bg-glass);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  color: var(--text-muted);
  font-style: italic;
}

blockquote::before {
  content: "\201C";
  position: absolute;
  left: 0.7rem;
  top: 0.2rem;
  font-size: 2.4rem;
  line-height: 1;
  color: var(--accent);
  opacity: 0.6;
  font-style: normal;
}

blockquote p { margin-bottom: 0; }

time {
  color: var(--text-dim);
  font-size: 0.875rem;
}

address { font-style: normal; }

/* ===== Skip Link ===== */
body > a[href="#main-content"] {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  padding: 0.75rem 1.25rem;
  background: var(--accent);
  color: #fff;
  border-radius: 0 0 var(--radius-sm) 0;
  font-weight: 600;
}

body > a[href="#main-content"]:focus {
  left: 0;
  text-decoration: none;
}

/* ===== Header ===== */
header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 13, 26, 0.72);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

@media (prefers-color-scheme: light) {
  header[role="banner"] {
    background: rgba(245, 246, 250, 0.78);
  }
}

header[role="banner"] > div {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.7rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

header[role="banner"] > div > a[aria-label] {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: 0.02em;
  flex-shrink: 0;
  text-decoration: none;
}

header[role="banner"] > div > a[aria-label]:hover {
  opacity: 1;
  text-decoration: none;
}

header[role="banner"] > div > a[aria-label] svg {
  border-radius: var(--radius-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

header[role="banner"] > div > a[aria-label]:hover svg {
  transform: rotate(-6deg) scale(1.06);
  box-shadow: var(--shadow-glow);
}

header[role="banner"] > div > a[aria-label] span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* Nav */
header nav {
  flex: 1 1 auto;
  min-width: 0;
}

header nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

header nav li { margin: 0; }

header nav a {
  display: inline-block;
  padding: 0.4rem 0.7rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

header nav a:hover,
header nav a:focus-visible {
  color: var(--text);
  background: var(--bg-glass-strong);
  text-decoration: none;
  transform: translateY(-1px);
}

/* Search */
header form[role="search"] {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
}

header form[role="search"] label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

header form[role="search"] input[type="search"] {
  width: 210px;
  padding: 0.5rem 0.9rem;
  font-size: 0.875rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color var(--transition), box-shadow var(--transition), width var(--transition);
}

header form[role="search"] input[type="search"]::placeholder {
  color: var(--text-dim);
}

header form[role="search"] input[type="search"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  width: 240px;
}

header form[role="search"] button[type="submit"] {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  color: #fff;
  background: var(--gradient-accent);
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

header form[role="search"] button[type="submit"]:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

header form[role="search"] button[type="submit"]:active {
  transform: translateY(0);
}

header > div > button[aria-label] {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
  flex-shrink: 0;
}

header > div > button[aria-label]:hover {
  transform: rotate(20deg) scale(1.08);
  background: var(--bg-glass-strong);
  box-shadow: var(--shadow-glow);
}

/* ===== Main Layout ===== */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

main section {
  margin: 2.5rem 0;
  scroll-margin-top: 90px;
  animation: fadeUp 0.7s cubic-bezier(0.4, 0, 0.2, 1) both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 通用卡片容器：对 section 内容做卡片化 */
main section:not(#hero):not(#sitemap):not(#links) {
  background: var(--bg-card);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 3vw, 2.5rem);
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

main section:not(#hero):not(#sitemap):not(#links):hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lg);
}

main section h2 {
  position: relative;
  padding-bottom: 0.6rem;
  margin-bottom: 1.25rem;
}

main section h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--gradient-accent);
  transition: width var(--transition);
}

main section:hover h2::after {
  width: 96px;
}

main section h3 {
  margin: 1.6rem 0 0.7rem;
  color: var(--text);
}

main section h3:first-of-type {
  margin-top: 0.4rem;
}

/* ===== Hero ===== */
#hero {
  position: relative;
  margin-top: 2rem;
  padding: clamp(1.75rem, 5vw, 3.5rem);
  background: var(--gradient-hero);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 15%, rgba(233, 69, 96, 0.28), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(83, 52, 131, 0.3), transparent 50%);
  pointer-events: none;
}

#hero > * {
  position: relative;
  z-index: 1;
}

#hero h1 {
  background: linear-gradient(120deg, var(--text) 30%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin-bottom: 1.1rem;
}

#hero p {
  color: var(--text-muted);
  max-width: 72ch;
}

#hero strong {
  color: var(--accent);
  font-weight: 700;
}

#hero > div {
  margin: 1.75rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

#hero > div:hover {
  transform: scale(1.01);
  box-shadow: var(--shadow-glow);
}

#hero > div svg {
  width: 100%;
  height: auto;
}

#hero ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-top: 1.5rem;
}

#hero ul li {
  margin: 0;
  padding: 0.8rem 1rem;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}

#hero ul li:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  background: var(--accent-soft);
}

#hero ul li strong {
  display: block;
  color: var(--accent);
  margin-bottom: 0.15rem;
  font-size: 0.95rem;
}

/* ===== Breadcrumb ===== */
main > nav[aria-label="面包屑导航"] {
  margin: 1.5rem 0 0;
}

main > nav[aria-label="面包屑导航"] ol {
  list-style: none;
  padding: 0.6rem 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  font-size: 0.85rem;
  width: fit-content;
  max-width: 100%;
}

main > nav[aria-label="面包屑导航"] li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  color: var(--text-muted);
}

main > nav[aria-label="面包屑导航"] li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: var(--text-dim);
  opacity: 0.6;
}

main > nav[aria-label="面包屑导航"] li[aria-current="page"] {
  color: var(--accent);
  font-weight: 600;
}

/* ===== 产品优势 / 列表 ===== */
main section ul li::marker {
  color: var(--accent);
}

main section ol li::marker {
  color: var(--accent);
  font-weight: 700;
}

/* ===== 新闻中心 & 技术文章 文章卡片 ===== */
#news article,
#articles article {
  position: relative;
  padding: 1.25rem 1.4rem;
  margin-bottom: 1rem;
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  overflow: hidden;
}

#news article::before,
#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition);
}

#news article:hover,
#articles article:hover {
  transform: translateX(4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

#news article:hover::before,
#articles article:hover::before {
  opacity: 1;
}

#news article:last-child,
#articles article:last-child {
  margin-bottom: 0;
}

#news article h3,
#articles article h3 {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
  transition: color var(--transition);
}

#news article:hover h3,
#articles article:hover h3 {
  color: var(--accent);
}

#news article time,
#articles article time {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-size: 0.8rem;
  padding: 0.15rem 0.7rem;
  background: var(--accent-soft);
  border-radius: var(--radius-pill);
  color: var(--accent);
  font-weight: 500;
}

#articles article a[href^="#article-"] {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.6rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  transition: gap var(--transition);
}

#articles article a[href^="#article-"]::after {
  content: "\2192";
  transition: transform var(--transition);
}

#articles article a[href^="#article-"]:hover {
  gap: 0.6rem;
  text-decoration: none;
}

/* ===== 文章正文区块 ===== */
main section[id^="article-"] {
  background: var(--bg-card-solid);
  border-left: 4px solid var(--accent);
}

main section[id^="article-"] > p:first-of-type {
  font-size: 0.85rem;
  color: var(--text-dim);
  padding-bottom: 1rem;
  border-bottom: 1px dashed var(--border);
  margin-bottom: 1.25rem;
}

main section[id^="article-"] p {
  color: var(--text-muted);
}

/* ===== FAQ ===== */
#faq details {
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

#faq details:hover {
  border-color: var(--border-strong);
  background: var(--bg-glass-strong);
}

#faq details[open] {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

#faq summary {
  position: relative;
  padding: 1rem 3rem 1rem 1.2rem;
  font-weight: 600;
  font-size: 0.975rem;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color var(--transition);
}

#faq summary::-webkit-details-marker {
  display: none;
}

#faq summary::after {
  content: "+";
  position: absolute;
  right: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 50%;
  transition: transform var(--transition), background var(--transition);
}

#faq details[open] summary::after {
  content: "\2212";
  transform: translateY(-50%) rotate(180deg);
  background: var(--accent);
  color: #fff;
}

#faq summary:hover {
  color: var(--accent);
}

#faq details p {
  padding: 0 1.2rem 1.1rem;
  color: var(--text-muted);
  font-size: 0.925rem;
  animation: fadeIn 0.35s ease both;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== HowTo ===== */
#howto ol {
  counter-reset: step;
  list-style: none;
  padding-left: 0;
}

#howto ol > li {
  counter-increment: step;
  position: relative;
  padding: 0.9rem 1rem 0.9rem 3.4rem;
  margin-bottom: 0.6rem;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), border-color var(--transition);
}

#howto ol > li:hover {
  transform: translateX(4px);
  border-color: var(--accent);
}

#howto ol > li::before {
  content: counter(step);
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: #fff;
  background: var(--gradient-accent);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

#howto > ul li {
  padding: 0.4rem 0;
  color: var(--text-muted);
}

/* ===== Contact ===== */
#contact address {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

#contact address p {
  margin: 0;
  padding: 0.85rem 1rem;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  transition: border-color var(--transition), transform var(--transition);
}

#contact address p:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

#contact address strong {
  display: block;
  font-size: 0.8rem;
  color: var(--text-dim);
  font-weight: 500;
  margin-bottom: 0.15rem;
}

/* ===== Sitemap & Links ===== */
#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

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

#sitemap a,
#links a {
  display: inline-block;
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: transform var(--transition), color var(--transition), border-color var(--transition), background var(--transition), box-shadow var(--transition);
}

#sitemap a:hover,
#links a:hover {
  transform: translateY(-2px);
  color: #fff;
  background: var(--gradient-accent);
  border-color: transparent;
  box-shadow: var(--shadow-glow);
  text-decoration: none;
}

/* ===== Privacy / Disclaimer / Security ===== */
#privacy p,
#disclaimer p,
#security p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

#privacy p strong,
#disclaimer p strong {
  color: var(--accent);
}

/* ===== Footer ===== */
footer[role="contentinfo"] {
  position: relative;
  margin-top: 3rem;
  padding: 2.5rem 1.25rem 2rem;
  text-align: center;
  background: linear-gradient(180deg, transparent, rgba(15, 52, 96, 0.25));
  border-top: 1px solid var(--border);
}

footer[role="contentinfo"] p {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

footer[role="contentinfo"] p:first-child {
  color: var(--text-muted);
  font-weight: 500;
}

footer[role="contentinfo"] p:nth-child(4) {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

footer[role="contentinfo"] p:nth-child(4) a {
  padding: 0.3rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: all var(--transition);
}

footer[role="contentinfo"] p:nth-child(4) a:hover {
  color: #fff;
  background: var(--gradient-accent);
  border-color: transparent;
  text-decoration: none;
}

footer[role="contentinfo"] p:last-child a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.55rem 1.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-accent);
  border-radius: var(--radius-pill);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

footer[role="contentinfo"] p:last-child a::after {
  content: "\2191";
}

footer[role="contentinfo"] p:last-child a:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
  text-decoration: none;
}

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

::-webkit-scrollbar-track {
  background: var(--bg-alt);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent), var(--accent-3));
  border-radius: var(--radius-pill);
  border: 2px solid var(--bg-alt);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* ===== Selection ===== */
::selection {
  background: var(--accent);
  color: #fff;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  header[role="banner"] > div {
    gap: 0.75rem;
  }

  header form[role="search"] input[type="search"] {
    width: 170px;
  }

  header form[role="search"] input[type="search"]:focus {
    width: 200px;
  }
}

@media (max-width: 860px) {
  header[role="banner"] > div {
    padding: 0.6rem 1rem;
  }

  header nav {
    order: 3;
    flex-basis: 100%;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    margin: 0 -1rem;
    padding: 0 1rem;
  }

  header nav::-webkit-scrollbar {
    display: none;
  }

  header nav ul {
    flex-wrap: nowrap;
    gap: 0.15rem;
    width: max-content;
  }

  header nav a {
    white-space: nowrap;
    font-size: 0.85rem;
  }

  header form[role="search"] {
    margin-left: auto;
  }

  main section:not(#hero):not(#sitemap):not(#links) {
    padding: 1.4rem;
    border-radius: var(--radius-md);
  }

  #hero {
    padding: 1.5rem;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
    line-height: 1.7;
  }

  main {
    padding: 0 0.9rem 3rem;
  }

  header[role="banner"] > div {
    padding: 0.55rem 0.9rem;
    gap: 0.5rem;
  }

  header[role="banner"] > div > a[aria-label] span {
    font-size: 1rem;
  }

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

  header form[role="search"] {
    order: 4;
    flex-basis: 100%;
    margin: 0.15rem 0 0;
  }

  header form[role="search"] input[type="search"],
  header form[role="search"] input[type="search"]:focus {
    flex: 1;
    width: auto;
  }

  header > div > button[aria-label] {
    width: 36px;
    height: 36px;
  }

  main section {
    margin: 1.75rem 0;
    scroll-margin-top: 120px;
  }

  #hero {
    margin-top: 1.25rem;
    padding: 1.25rem;
    border-radius: var(--radius-md);
  }

  #hero ul {
    grid-template-columns: 1fr;
  }

  main > nav[aria-label="面包屑导航"] ol {
    font-size: 0.78rem;
    padding: 0.5rem 0.8rem;
  }

  #news article,
  #articles article {
    padding: 1rem 1.1rem;
  }

  #news article:hover,
  #articles article:hover {
    transform: none;
  }

  #contact address {
    grid-template-columns: 1fr;
  }

  footer[role="contentinfo"] {
    padding: 2rem 0.9rem 1.5rem;
  }

  footer[role="contentinfo"] p:nth-child(4) {
    gap: 0.4rem;
  }
}

@media (max-width: 380px) {
  header[role="banner"] > div > a[aria-label] span {
    display: none;
  }

  #hero h1 {
    font-size: 1.5rem;
  }
}

/* ===== 减少动画偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===== 打印 ===== */
@media print {
  header[role="banner"],
  footer[role="contentinfo"],
  #sitemap,
  #links,
  header form[role="search"],
  header > div > button[aria-label] {
    display: none !important;
  }

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

  main section {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}