:root {
  --color-primary: #f5c542;
  --color-primary-dark: #d4a82a;
  --color-secondary: #3a7bd5;
  --color-accent: #e45a5a;
  --color-success: #2ecc71;
  --color-bg: #f7f8fc;
  --color-bg-alt: #ffffff;
  --color-bg-glass: rgba(255, 255, 255, 0.72);
  --color-bg-glass-border: rgba(255, 255, 255, 0.45);
  --color-text: #1a2332;
  --color-text-secondary: #4a5568;
  --color-text-muted: #8895a7;
  --color-border: rgba(11, 26, 47, 0.1);
  --color-header-bg: rgba(255, 255, 255, 0.82);
  --color-footer-bg: #0b1a2f;
  --color-footer-text: #c8d2e0;
  --color-card-shadow: 0 4px 20px rgba(11, 26, 47, 0.08);
  --color-card-shadow-hover: 0 12px 40px rgba(11, 26, 47, 0.16);
  --gradient-hero: linear-gradient(135deg, #0b1a2f 0%, #1a3355 40%, #2a4a7f 70%, #3a7bd5 100%);
  --gradient-btn: linear-gradient(135deg, #f5c542 0%, #e8a820 100%);
  --gradient-btn-hover: linear-gradient(135deg, #ffd75e 0%, #f5c542 100%);
  --gradient-card-top: linear-gradient(90deg, #f5c542, #3a7bd5, #e45a5a, #2ecc71);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 68px;
}

[data-theme="dark"] {
  --color-bg: #0d1520;
  --color-bg-alt: #162030;
  --color-bg-glass: rgba(22, 32, 48, 0.78);
  --color-bg-glass-border: rgba(255, 255, 255, 0.08);
  --color-text: #e8edf5;
  --color-text-secondary: #a8b8cc;
  --color-text-muted: #6b7f99;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-header-bg: rgba(13, 21, 32, 0.85);
  --color-footer-bg: #080e18;
  --color-footer-text: #8a9bb5;
  --color-card-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  --color-card-shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.45);
  --gradient-hero: linear-gradient(135deg, #060b14 0%, #0d1a2e 40%, #142a4a 70%, #1a3a66 100%);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

[data-theme="dark"] a {
  color: #6aabf0;
}

[data-theme="dark"] a:hover {
  color: var(--color-primary);
}

ul,
ol {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
  font-size: inherit;
  color: inherit;
}

input {
  font-family: inherit;
  font-size: inherit;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

header[role="banner"] {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--color-header-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

header[role="banner"].scrolled {
  box-shadow: 0 2px 20px rgba(11, 26, 47, 0.1);
}

[data-theme="dark"] header[role="banner"].scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 20px;
}

.header-inner > a:first-child {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  transition: transform var(--transition-fast);
}

.header-inner > a:first-child:hover {
  transform: scale(1.04);
}

.header-inner > a:first-child svg {
  width: 120px;
  height: 40px;
}

nav[aria-label="主导航"] {
  flex: 1;
  display: flex;
  justify-content: center;
}

nav[aria-label="主导航"] ul {
  display: flex;
  gap: 4px;
}

nav[aria-label="主导航"] ul li a {
  display: block;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  position: relative;
}

nav[aria-label="主导航"] ul li a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: var(--gradient-btn);
  border-radius: 2px;
  transition: transform var(--transition-base);
}

nav[aria-label="主导航"] ul li a:hover {
  color: var(--color-text);
  background: rgba(245, 197, 66, 0.08);
}

nav[aria-label="主导航"] ul li a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

[data-theme="dark"] nav[aria-label="主导航"] ul li a:hover {
  background: rgba(245, 197, 66, 0.1);
}

form[role="search"] {
  display: flex;
  align-items: center;
  gap: 0;
  flex-shrink: 0;
  position: relative;
}

form[role="search"] input[type="search"] {
  width: 200px;
  padding: 8px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  background: var(--color-bg-alt);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), width var(--transition-base);
  font-size: 14px;
}

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

form[role="search"] input[type="search"]:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(245, 197, 66, 0.2);
  width: 240px;
}

form[role="search"] button[type="submit"] {
  padding: 8px 16px;
  background: var(--gradient-btn);
  color: #0b1a2f;
  font-weight: 600;
  font-size: 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  white-space: nowrap;
}

form[role="search"] button[type="submit"]:hover {
  background: var(--gradient-btn-hover);
  box-shadow: 0 4px 16px rgba(245, 197, 66, 0.4);
}

form[role="search"] button[type="submit"]:active {
  transform: scale(0.97);
}

#darkModeToggle {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 18px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

#darkModeToggle:hover {
  background: rgba(245, 197, 66, 0.15);
  transform: rotate(20deg) scale(1.08);
  box-shadow: 0 4px 16px rgba(245, 197, 66, 0.25);
}

#menuToggle {
  display: none;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 22px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

#menuToggle:hover {
  background: rgba(245, 197, 66, 0.15);
}

#menuToggle[aria-expanded="true"] {
  background: rgba(245, 197, 66, 0.2);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--header-height) + 24px) 24px 60px;
}

nav[aria-label="面包屑导航"] {
  margin-bottom: 28px;
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--color-text-muted);
}

nav[aria-label="面包屑导航"] ol li {
  display: flex;
  align-items: center;
  gap: 6px;
}

nav[aria-label="面包屑导航"] ol li:not(:last-child)::after {
  content: '/';
  color: var(--color-text-muted);
  opacity: 0.5;
}

nav[aria-label="面包屑导航"] ol li a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

nav[aria-label="面包屑导航"] ol li a:hover {
  color: var(--color-primary-dark);
}

nav[aria-label="面包屑导航"] ol li[aria-current="page"] {
  color: var(--color-text);
  font-weight: 500;
}

section {
  margin-bottom: 48px;
  animation: fadeInUp 0.7s cubic-bezier(0.4, 0, 0.2, 1) both;
}

section:nth-child(2) { animation-delay: 0.05s; }
section:nth-child(3) { animation-delay: 0.1s; }
section:nth-child(4) { animation-delay: 0.15s; }
section:nth-child(5) { animation-delay: 0.2s; }
section:nth-child(6) { animation-delay: 0.25s; }
section:nth-child(7) { animation-delay: 0.3s; }
section:nth-child(8) { animation-delay: 0.35s; }
section:nth-child(9) { animation-delay: 0.4s; }
section:nth-child(10) { animation-delay: 0.45s; }
section:nth-child(11) { animation-delay: 0.5s; }
section:nth-child(12) { animation-delay: 0.55s; }
section:nth-child(13) { animation-delay: 0.6s; }

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

section.visible {
  opacity: 1;
  transform: translateY(0);
}

h1 {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

[data-theme="dark"] h1 {
  background: linear-gradient(135deg, #e8edf5 0%, #6aabf0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 16px;
  color: var(--color-text);
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 5px;
  border-radius: 3px;
  background: var(--gradient-btn);
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.45;
  margin-bottom: 10px;
  color: var(--color-text);
}

p {
  margin-bottom: 14px;
  color: var(--color-text-secondary);
}

section > p {
  max-width: 860px;
}

#hero {
  position: relative;
  background: var(--gradient-hero);
  border-radius: var(--radius-xl);
  padding: 56px 48px;
  margin-bottom: 48px;
  overflow: hidden;
  color: #ffffff;
  box-shadow: 0 20px 60px rgba(11, 26, 47, 0.25);
}

#hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(245, 197, 66, 0.18) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

#hero::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(58, 123, 213, 0.2) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

#hero h1 {
  background: none;
  -webkit-text-fill-color: #ffffff;
  color: #ffffff;
  position: relative;
  z-index: 1;
  font-size: 2.4rem;
}

#hero > p {
  color: rgba(255, 255, 255, 0.82);
  max-width: 720px;
  position: relative;
  z-index: 1;
  font-size: 1.02rem;
}

#hero > div {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin: 28px 0 32px;
  position: relative;
  z-index: 1;
}

#hero > div button {
  padding: 12px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 15px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

#hero > div button:first-child {
  background: var(--gradient-btn);
  color: #0b1a2f;
  box-shadow: 0 6px 24px rgba(245, 197, 66, 0.4);
}

#hero > div button:first-child:hover {
  background: var(--gradient-btn-hover);
  transform: translateY(-3px);
  box-shadow: 0 10px 32px rgba(245, 197, 66, 0.55);
}

#hero > div button:last-child {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border: 1.5px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#hero > div button:last-child:hover {
  background: rgba(255, 255, 255, 0.22);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(255, 255, 255, 0.15);
}

#hero figure {
  position: relative;
  z-index: 1;
  margin-top: 8px;
}

#hero figure svg {
  width: 100%;
  max-width: 800px;
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
  transition: transform var(--transition-slow);
}

#hero figure:hover svg {
  transform: scale(1.015);
}

#hero figcaption {
  margin-top: 12px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  font-style: italic;
}

#hot,
#daily,
#articles,
#howto,
#faq,
#contact,
#news,
#sitemap,
#links {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--color-card-shadow);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

#hot:hover,
#daily:hover,
#articles:hover,
#howto:hover,
#faq:hover,
#contact:hover,
#news:hover,
#sitemap:hover,
#links:hover {
  box-shadow: var(--color-card-shadow-hover);
  border-color: rgba(245, 197, 66, 0.25);
}

#articles article {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  transition: padding-left var(--transition-base), background var(--transition-base);
  border-radius: var(--radius-sm);
}

#articles article:last-child {
  border-bottom: none;
}

#articles article:hover {
  padding-left: 16px;
  background: rgba(245, 197, 66, 0.04);
}

[data-theme="dark"] #articles article:hover {
  background: rgba(245, 197, 66, 0.06);
}

#articles article h3 {
  margin-bottom: 6px;
}

#articles article h3 a {
  color: var(--color-text);
  transition: color var(--transition-fast);
}

#articles article h3 a:hover {
  color: var(--color-primary-dark);
}

#articles article time {
  display: inline-block;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}

#articles article p {
  font-size: 14.5px;
  margin-bottom: 10px;
}

#articles article > a:last-child {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-secondary);
  transition: gap var(--transition-fast), color var(--transition-fast);
}

#articles article > a:last-child::after {
  content: '→';
  transition: transform var(--transition-fast);
}

#articles article > a:last-child:hover {
  gap: 8px;
  color: var(--color-primary-dark);
}

#articles article > a:last-child:hover::after {
  transform: translateX(3px);
}

#howto ol {
  counter-reset: step;
  margin: 16px 0;
  padding-left: 0;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 14px 16px 14px 60px;
  margin-bottom: 10px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  font-size: 15px;
  color: var(--color-text-secondary);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-btn);
  color: #0b1a2f;
  font-weight: 700;
  font-size: 14px;
  border-radius: 50%;
  box-shadow: 0 3px 10px rgba(245, 197, 66, 0.35);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: 0 4px 16px rgba(11, 26, 47, 0.08);
  border-color: rgba(245, 197, 66, 0.35);
}

[data-theme="dark"] #howto ol li:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

#faq details {
  margin-bottom: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

#faq details[open] {
  border-color: rgba(245, 197, 66, 0.4);
  box-shadow: 0 4px 20px rgba(245, 197, 66, 0.1);
}

#faq details:hover {
  border-color: rgba(245, 197, 66, 0.3);
}

#faq summary {
  padding: 16px 20px;
  font-weight: 600;
  font-size: 15px;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: background var(--transition-fast);
  user-select: none;
}

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

#faq summary::after {
  content: '+';
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(245, 197, 66, 0.15);
  color: var(--color-primary-dark);
  border-radius: 50%;
  font-size: 18px;
  font-weight: 400;
  line-height: 1;
  transition: transform var(--transition-base), background var(--transition-fast);
}

#faq details[open] summary::after {
  content: '−';
  transform: rotate(180deg);
  background: var(--gradient-btn);
  color: #0b1a2f;
}

#faq summary:hover {
  background: rgba(245, 197, 66, 0.05);
}

#faq details p {
  padding: 0 20px 18px;
  font-size: 14.5px;
  color: var(--color-text-secondary);
  animation: fadeIn 0.3s ease;
}

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

#contact address {
  font-style: normal;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  margin: 20px 0;
}

#contact address p {
  padding: 14px 18px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  font-size: 14.5px;
  margin-bottom: 0;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

#contact address p:hover {
  transform: translateY(-3px);
  border-color: rgba(245, 197, 66, 0.35);
  box-shadow: 0 6px 20px rgba(11, 26, 47, 0.07);
}

[data-theme="dark"] #contact address p:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

#contact address a {
  font-weight: 500;
  color: var(--color-secondary);
  transition: color var(--transition-fast);
}

#contact address a:hover {
  color: var(--color-primary-dark);
}

#news article {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border);
  transition: padding-left var(--transition-base), background var(--transition-base);
  border-radius: var(--radius-sm);
}

#news article:last-child {
  border-bottom: none;
}

#news article:hover {
  padding-left: 16px;
  background: rgba(58, 123, 213, 0.04);
}

[data-theme="dark"] #news article:hover {
  background: rgba(58, 123, 213, 0.08);
}

#news article h3 {
  margin-bottom: 4px;
}

#news article h3 a {
  color: var(--color-text);
  transition: color var(--transition-fast);
}

#news article h3 a:hover {
  color: var(--color-secondary);
}

#news article time {
  display: inline-block;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 6px;
  font-variant-numeric: tabular-nums;
}

#news article p {
  font-size: 14.5px;
  margin-bottom: 0;
}

#sitemap ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 16px;
}

#sitemap ul li a {
  display: block;
  padding: 12px 18px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  font-size: 14.5px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: transform var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

#sitemap ul li a:hover {
  transform: translateY(-3px);
  border-color: rgba(245, 197, 66, 0.4);
  color: var(--color-primary-dark);
  background: rgba(245, 197, 66, 0.06);
  box-shadow: 0 6px 20px rgba(245, 197, 66, 0.12);
}

#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

#links ul li a {
  display: inline-block;
  padding: 10px 24px;
  background: var(--color-bg);
  border-radius: 50px;
  border: 1px solid var(--color-border);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: transform var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

#links ul li a:hover {
  transform: translateY(-3px);
  border-color: rgba(58, 123, 213, 0.4);
  color: var(--color-secondary);
  background: rgba(58, 123, 213, 0.06);
  box-shadow: 0 6px 20px rgba(58, 123, 213, 0.12);
}

footer[role="contentinfo"] {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 48px 24px 32px;
  position: relative;
  overflow: hidden;
}

footer[role="contentinfo"]::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-card-top);
}

footer[role="contentinfo"] > div {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

footer[role="contentinfo"] p {
  color: var(--color-footer-text);
  font-size: 14px;
  margin-bottom: 8px;
  line-height: 1.7;
}

footer[role="contentinfo"] p:first-child {
  font-size: 16px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 16px;
}

footer[role="contentinfo"] a {
  color: var(--color-primary);
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

footer[role="contentinfo"] a:hover {
  color: #ffd75e;
  opacity: 0.9;
}

footer[role="contentinfo"] small {
  font-size: 12.5px;
  opacity: 0.7;
}

#backToTop {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 900;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-btn);
  color: #0b1a2f;
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 6px 24px rgba(245, 197, 66, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), box-shadow var(--transition-fast);
}

#backToTop.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#backToTop:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 10px 32px rgba(245, 197, 66, 0.55);
}

#backToTop:active {
  transform: translateY(-2px) scale(0.98);
}

@media (max-width: 1024px) {
  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  nav[aria-label="主导航"] ul li a {
    padding: 8px 10px;
    font-size: 13px;
  }

  form[role="search"] input[type="search"] {
    width: 150px;
  }

  form[role="search"] input[type="search"]:focus {
    width: 180px;
  }

  h1 {
    font-size: 1.9rem;
  }

  #hero h1 {
    font-size: 2rem;
  }

  #hero {
    padding: 44px 36px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .header-inner {
    padding: 0 14px;
    gap: 10px;
  }

  .header-inner > a:first-child svg {
    width: 100px;
    height: 34px;
  }

  nav[aria-label="主导航"] {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg-glass);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
    z-index: 999;
    justify-content: flex-start;
  }

  nav[aria-label="主导航"].open {
    max-height: 400px;
    padding: 12px 0;
    box-shadow: 0 12px 40px rgba(11, 26, 47, 0.15);
  }

  [data-theme="dark"] nav[aria-label="主导航"].open {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  }

  nav[aria-label="主导航"] ul {
    flex-direction: column;
    width: 100%;
    gap: 2px;
    padding: 0 12px;
  }

  nav[aria-label="主导航"] ul li a {
    padding: 12px 16px;
    font-size: 15px;
    border-radius: var(--radius-sm);
  }

  nav[aria-label="主导航"] ul li a::after {
    display: none;
  }

  form[role="search"] {
    flex: 1;
    max-width: 180px;
  }

  form[role="search"] input[type="search"] {
    width: 100%;
    min-width: 0;
    padding: 7px 12px;
    font-size: 13px;
  }

  form[role="search"] input[type="search"]:focus {
    width: 100%;
  }

  form[role="search"] button[type="submit"] {
    padding: 7px 12px;
    font-size: 13px;
  }

  #darkModeToggle {
    width: 36px;
    height: 36px;
    font-size: 16px;
  }

  #menuToggle {
    display: flex;
    width: 36px;
    height: 36px;
    font-size: 20px;
  }

  main {
    padding: calc(var(--header-height) + 16px) 14px 40px;
  }

  #hero {
    padding: 32px 22px;
    border-radius: var(--radius-lg);
  }

  #hero h1 {
    font-size: 1.55rem;
  }

  #hero > p {
    font-size: 0.95rem;
  }

  #hero > div {
    flex-direction: column;
    gap: 10px;
  }

  #hero > div button {
    width: 100%;
    text-align: center;
    padding: 12px 24px;
  }

  h1 {
    font-size: 1.6rem;
  }

  h2 {
    font-size: 1.3rem;
    padding-left: 14px;
  }

  h2::before {
    width: 4px;
  }

  h3 {
    font-size: 1.05rem;
  }

  #hot,
  #daily,
  #articles,
  #howto,
  #faq,
  #contact,
  #news,
  #sitemap,
  #links {
    padding: 24px 18px;
    border-radius: var(--radius-md);
  }

  section {
    margin-bottom: 32px;
  }

  #howto ol li {
    padding: 12px 12px 12px 52px;
    font-size: 14px;
  }

  #howto ol li::before {
    left: 12px;
    width: 26px;
    height: 26px;
    font-size: 13px;
  }

  #faq summary {
    padding: 14px 16px;
    font-size: 14px;
  }

  #faq details p {
    padding: 0 16px 14px;
    font-size: 13.5px;
  }

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

  #sitemap ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  #sitemap ul li a {
    padding: 10px 14px;
    font-size: 13.5px;
  }

  #links ul {
    gap: 8px;
  }

  #links ul li a {
    padding: 8px 18px;
    font-size: 13px;
  }

  footer[role="contentinfo"] {
    padding: 36px 16px 28px;
  }

  footer[role="contentinfo"] p {
    font-size: 13px;
  }

  footer[role="contentinfo"] p:first-child {
    font-size: 15px;
  }

  #backToTop {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 12px;
  }

  #articles article:hover,
  #news article:hover {
    padding-left: 8px;
  }
}

@media (max-width: 480px) {
  .header-inner > a:first-child svg {
    width: 84px;
    height: 30px;
  }

  form[role="search"] {
    max-width: 130px;
  }

  #hero {
    padding: 26px 16px;
  }

  #hero h1 {
    font-size: 1.35rem;
  }

  h1 {
    font-size: 1.4rem;
  }

  h2 {
    font-size: 1.15rem;
  }

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

  #hero figure svg {
    border-radius: var(--radius-md);
  }
}

@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;
  }
}

@media print {
  header[role="banner"],
  #backToTop,
  #darkModeToggle,
  #menuToggle,
  nav[aria-label="主导航"],
  form[role="search"] {
    display: none !important;
  }

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

  main {
    padding-top: 0;
  }

  #hero {
    background: #f0f0f0;
    color: #000;
    box-shadow: none;
  }

  #hero h1 {
    color: #000;
    -webkit-text-fill-color: #000;
  }

  #hero > p {
    color: #333;
  }

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

::selection {
  background: rgba(245, 197, 66, 0.35);
  color: var(--color-text);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: rgba(11, 26, 47, 0.2);
  border-radius: 5px;
  border: 2px solid var(--color-bg);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(11, 26, 47, 0.35);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--color-bg);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

button:focus:not(:focus-visible),
a:focus:not(:focus-visible) {
  outline: none;
}