:root {
  --bg: #f4f6fb;
  --bg-alt: #ffffff;
  --bg-elevated: rgba(255, 255, 255, 0.72);
  --text: #1a1a2e;
  --text-soft: #4a4a63;
  --text-muted: #7a7a92;
  --primary: #1a1a2e;
  --accent: #4fc3f7;
  --accent-2: #7c5cff;
  --accent-3: #00d4aa;
  --border: rgba(26, 26, 46, 0.1);
  --border-strong: rgba(26, 26, 46, 0.18);
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.09);
  --shadow-lg: 0 18px 48px rgba(26, 26, 46, 0.13);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --glass-blur: 16px;
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #2b2b52 35%, #3b2f7a 65%, #4fc3f7 130%);
  --gradient-accent: linear-gradient(120deg, #4fc3f7 0%, #7c5cff 100%);
  --gradient-soft: linear-gradient(135deg, rgba(79, 195, 247, 0.14), rgba(124, 92, 255, 0.14));
  --header-h: 72px;
  --max-w: 1200px;
  --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="dark"] {
  --bg: #0d0d1a;
  --bg-alt: #14142a;
  --bg-elevated: rgba(20, 20, 42, 0.7);
  --text: #eef0ff;
  --text-soft: #c2c6e0;
  --text-muted: #8b90b0;
  --primary: #4fc3f7;
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.2);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
  --gradient-hero: linear-gradient(135deg, #0d0d1a 0%, #1a1a3e 35%, #2b1f5e 65%, #4fc3f7 140%);
  --gradient-soft: linear-gradient(135deg, rgba(79, 195, 247, 0.1), rgba(124, 92, 255, 0.1));
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(600px 400px at 12% 8%, rgba(79, 195, 247, 0.1), transparent 70%),
    radial-gradient(700px 500px at 88% 22%, rgba(124, 92, 255, 0.1), transparent 70%),
    radial-gradient(500px 500px at 50% 100%, rgba(0, 212, 170, 0.07), transparent 70%);
  pointer-events: none;
}

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

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

a:hover {
  color: var(--accent-2);
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(1.75rem, 4vw, 3rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2.1rem); }
h3 { font-size: clamp(1.15rem, 2.2vw, 1.5rem); }
h4 { font-size: clamp(1.02rem, 1.8vw, 1.2rem); }

p { margin-bottom: 1rem; color: var(--text-soft); }

ul, ol { list-style: none; }

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

input, button, textarea, select {
  font: inherit;
}

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

::selection {
  background: rgba(79, 195, 247, 0.3);
  color: var(--text);
}

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--accent), var(--accent-2));
  border-radius: 10px;
  border: 2px solid var(--bg);
}

/* ============ HEADER ============ */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: var(--bg-elevated);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#site-header.scrolled {
  box-shadow: var(--shadow-md);
  background: var(--bg-elevated);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--text);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.logo:hover {
  transform: translateY(-2px);
  color: var(--text);
}

.logo svg {
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.logo:hover svg {
  transform: rotate(-6deg) scale(1.05);
  box-shadow: 0 0 0 3px rgba(79, 195, 247, 0.25), var(--shadow-md);
}

.logo span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.02em;
}

nav[aria-label="主导航"] {
  flex: 1;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-list li a {
  display: block;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--text-soft);
  font-size: 0.92rem;
  font-weight: 500;
  position: relative;
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

.nav-list li a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
  transform: translateX(-50%);
  transition: width var(--transition);
}

.nav-list li a:hover {
  color: var(--text);
  background: var(--gradient-soft);
  transform: translateY(-2px);
}

.nav-list li a:hover::after {
  width: 60%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.search-form {
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), width var(--transition);
  width: 200px;
}

.search-form:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(79, 195, 247, 0.15);
  width: 240px;
}

.search-form input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 8px 14px;
  font-size: 0.88rem;
  color: var(--text);
  outline: none;
  min-width: 0;
}

.search-form input::placeholder {
  color: var(--text-muted);
}

.search-form button {
  display: grid;
  place-items: center;
  padding: 8px 12px;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
}

.search-form button:hover {
  color: var(--accent);
  background: var(--gradient-soft);
}

#theme-toggle,
#mobile-menu-btn {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--text-soft);
  border: 1px solid var(--border);
  background: var(--bg-alt);
  transition: transform var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

#theme-toggle:hover,
#mobile-menu-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px) rotate(8deg);
  box-shadow: var(--shadow-md);
}

#theme-toggle:active,
#mobile-menu-btn:active {
  transform: scale(0.94);
}

#mobile-menu-btn {
  display: none;
}

/* ============ MAIN ============ */
main {
  padding-top: var(--header-h);
  display: block;
}

.section,
.breadcrumb {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.breadcrumb {
  padding-top: 24px;
  padding-bottom: 8px;
  font-size: 0.85rem;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--border-strong);
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--accent);
}

.breadcrumb [aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

/* ============ HERO ============ */
.hero-section {
  position: relative;
  max-width: var(--max-w);
  margin: 16px auto 0;
  padding: 0 24px;
}

.hero-content {
  position: relative;
  border-radius: var(--radius-xl);
  padding: clamp(36px, 6vw, 72px) clamp(24px, 5vw, 64px);
  background: var(--gradient-hero);
  color: #fff;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  isolation: isolate;
}

.hero-content::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(420px 320px at 85% 15%, rgba(79, 195, 247, 0.35), transparent 65%),
    radial-gradient(380px 300px at 10% 90%, rgba(124, 92, 255, 0.35), transparent 65%);
  z-index: -1;
  animation: heroGlow 12s ease-in-out infinite alternate;
}

.hero-content::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.08) 50%, transparent 70%);
  transform: translateX(-100%);
  animation: heroShine 7s ease-in-out infinite;
  pointer-events: none;
}

@keyframes heroGlow {
  0% { opacity: 0.7; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.15); }
}

@keyframes heroShine {
  0%, 100% { transform: translateX(-100%); }
  50% { transform: translateX(100%); }
}

.hero-content h1 {
  color: #fff;
  margin-bottom: 20px;
  max-width: 900px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
  animation: fadeUp 0.8s var(--transition) both;
}

.hero-content > p {
  color: rgba(255, 255, 255, 0.88);
  max-width: 780px;
  font-size: clamp(0.95rem, 1.6vw, 1.08rem);
  margin-bottom: 36px;
  animation: fadeUp 0.8s 0.15s var(--transition) both;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  animation: fadeUp 0.8s 0.3s var(--transition) both;
}

.stat-item {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  text-align: center;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.stat-item:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(79, 195, 247, 0.5);
}

.stat-number {
  display: block;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 800;
  line-height: 1.1;
  background: linear-gradient(120deg, #fff, #4fc3f7);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.75);
  letter-spacing: 0.04em;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ SECTIONS ============ */
.section {
  margin-top: 72px;
  animation: revealUp 0.7s ease both;
}

.section:nth-of-type(even) {
  animation-delay: 0.05s;
}

@keyframes revealUp {
  from { opacity: 0; transform: translateY(32px); }
  to { opacity: 1; transform: translateY(0); }
}

.section > h2 {
  position: relative;
  padding-bottom: 16px;
  margin-bottom: 28px;
}

.section > h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 72px;
  height: 4px;
  border-radius: 4px;
  background: var(--gradient-accent);
  transition: width var(--transition);
}

.section > h2:hover::after {
  width: 130px;
}

.section h3 {
  margin-top: 32px;
  margin-bottom: 12px;
  color: var(--text);
}

.section h4 {
  margin-top: 22px;
  margin-bottom: 10px;
  color: var(--accent-2);
}

.section p {
  max-width: 78ch;
}

/* ============ COMPANY / CONTACT INFO ============ */
.company-info,
.contact-info {
  display: grid;
  grid-template-columns: minmax(120px, 200px) 1fr;
  gap: 0;
  margin: 24px 0;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.company-info:hover,
.contact-info:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.company-info dt,
.contact-info dt {
  padding: 14px 20px;
  font-weight: 600;
  color: var(--text);
  background: var(--gradient-soft);
}

.company-info dd,
.contact-info dd {
  padding: 14px 20px;
  color: var(--text-soft);
  border-bottom: 1px solid var(--border);
}

.company-info dt,
.contact-info dt {
  border-bottom: 1px solid var(--border);
}

.company-info dt:last-of-type,
.company-info dd:last-of-type,
.contact-info dt:last-of-type,
.contact-info dd:last-of-type {
  border-bottom: none;
}

/* ============ NEWS ============ */
.news-item {
  position: relative;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 28px 26px 34px;
  margin-bottom: 18px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  overflow: hidden;
}

.news-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--gradient-accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

.news-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

.news-item:hover::before {
  transform: scaleY(1);
}

.news-item h3 {
  margin: 0 0 8px;
  font-size: 1.15rem;
}

.news-item time {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--text-muted);
  background: var(--gradient-soft);
  padding: 3px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.news-item p {
  margin-bottom: 0;
}

/* ============ ARTICLE CARDS ============ */
#articles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 22px;
  align-items: stretch;
}

#articles > h2 {
  grid-column: 1 / -1;
}

.article-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 26px 22px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.article-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-soft);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.article-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(79, 195, 247, 0.4);
}

.article-card:hover::before {
  opacity: 1;
}

.article-card h3 {
  margin: 0 0 10px;
  font-size: 1.12rem;
  line-height: 1.45;
  position: relative;
  z-index: 1;
}

.article-card h3 a {
  color: var(--text);
  transition: color var(--transition);
}

.article-card h3 a:hover {
  color: var(--accent);
}

.article-card time {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.article-card p {
  flex: 1;
  font-size: 0.92rem;
  margin-bottom: 18px;
  position: relative;
  z-index: 1;
}

.read-more {
  align-self: flex-start;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid rgba(79, 195, 247, 0.35);
  background: rgba(79, 195, 247, 0.08);
  position: relative;
  z-index: 1;
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.read-more:hover {
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  transform: translateX(6px);
  box-shadow: 0 8px 20px rgba(79, 195, 247, 0.35);
}

/* ============ BLOCKQUOTE ============ */
blockquote {
  position: relative;
  margin: 18px 0;
  padding: 22px 26px 22px 56px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

blockquote::before {
  content: "\201C";
  position: absolute;
  left: 18px;
  top: 6px;
  font-size: 3.4rem;
  line-height: 1;
  font-family: Georgia, serif;
  color: var(--accent);
  opacity: 0.5;
}

blockquote:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

blockquote p {
  margin: 0;
  font-style: italic;
  color: var(--text-soft);
}

/* ============ FAQ ============ */
#faq details {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

#faq details:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

#faq details[open] {
  border-color: rgba(79, 195, 247, 0.4);
  box-shadow: var(--shadow-md);
}

#faq summary {
  cursor: pointer;
  padding: 18px 52px 18px 22px;
  font-weight: 600;
  color: var(--text);
  list-style: none;
  position: relative;
  transition: background var(--transition), color var(--transition);
  user-select: none;
}

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

#faq summary::after {
  content: "";
  position: absolute;
  right: 22px;
  top: 50%;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: translateY(-70%) rotate(45deg);
  transition: transform var(--transition);
}

#faq details[open] summary::after {
  transform: translateY(-30%) rotate(-135deg);
}

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

#faq details[open] summary {
  background: var(--gradient-soft);
  border-bottom: 1px solid var(--border);
}

#faq details p {
  padding: 18px 22px;
  margin: 0;
  animation: fadeUp 0.4s ease both;
}

/* ============ SITEMAP ============ */
.sitemap-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 18px;
}

.sitemap-list > li {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.sitemap-list > li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(79, 195, 247, 0.35);
}

.sitemap-list > li > a {
  display: inline-block;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
  font-size: 1rem;
}

.sitemap-list > li > a:hover {
  color: var(--accent);
}

.sitemap-list ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 4px;
}

.sitemap-list ul a {
  font-size: 0.88rem;
  color: var(--text-muted);
  position: relative;
  padding-left: 14px;
  transition: color var(--transition), padding-left var(--transition);
}

.sitemap-list ul a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  transform: translateY(-50%) scale(0.7);
  opacity: 0.5;
  transition: transform var(--transition), opacity var(--transition);
}

.sitemap-list ul a:hover {
  color: var(--accent);
  padding-left: 20px;
}

.sitemap-list ul a:hover::before {
  transform: translateY(-50%) scale(1);
  opacity: 1;
}

/* ============ FRIEND LINKS ============ */
.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.friend-links li a {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-soft);
  font-size: 0.88rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.friend-links li a:hover {
  color: #fff;
  background: var(--gradient-accent);
  border-color: transparent;
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 10px 24px rgba(79, 195, 247, 0.3);
}

/* ============ FOOTER ============ */
#site-footer {
  margin-top: 80px;
  background: var(--gradient-hero);
  color: rgba(255, 255, 255, 0.85);
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(500px 300px at 15% 10%, rgba(79, 195, 247, 0.18), transparent 70%),
    radial-gradient(500px 300px at 85% 90%, rgba(124, 92, 255, 0.18), transparent 70%);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 56px 24px 36px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr 1fr;
  gap: 32px;
}

.footer-brand svg {
  border-radius: 10px;
  margin-bottom: 14px;
  box-shadow: 0 0 0 4px rgba(79, 195, 247, 0.15);
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.92rem;
  margin: 0;
}

.footer-links h3,
.footer-contact h3,
.footer-legal h3 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.footer-links h3::after,
.footer-contact h3::after,
.footer-legal h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 3px;
  border-radius: 3px;
  background: var(--gradient-accent);
}

.footer-links ul,
.footer-legal ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a,
.footer-legal a {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9rem;
  transition: color var(--transition), padding-left var(--transition);
  display: inline-block;
}

.footer-links a:hover,
.footer-legal a:hover {
  color: var(--accent);
  padding-left: 6px;
}

.footer-contact address {
  font-style: normal;
}

.footer-contact address p {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.footer-bottom {
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 22px 24px;
  text-align: center;
}

.footer-bottom p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.82rem;
  margin: 4px 0;
}

/* ============ BACK TO TOP ============ */
#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--gradient-accent);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), box-shadow var(--transition);
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 14px 32px rgba(79, 195, 247, 0.45);
}

#back-to-top:active {
  transform: scale(0.94);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 64px;
  }

  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

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

  nav[aria-label="主导航"].open {
    max-height: 480px;
    padding: 12px 0;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 0 16px;
  }

  .nav-list li a {
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 0.95rem;
  }

  .nav-list li a::after {
    display: none;
  }

  .search-form {
    width: 150px;
  }

  .search-form:focus-within {
    width: 180px;
  }

  #mobile-menu-btn {
    display: grid;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .section {
    margin-top: 56px;
  }

  .company-info,
  .contact-info {
    grid-template-columns: 1fr;
  }

  .company-info dt,
  .contact-info dt {
    padding-bottom: 4px;
    background: transparent;
    border-bottom: none;
  }

  .company-info dd,
  .contact-info dd {
    padding-top: 0;
  }

  #articles {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 40px 20px 28px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

  .section,
  .breadcrumb {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-section {
    padding: 0 16px;
  }

  .hero-content {
    border-radius: var(--radius-lg);
    padding: 32px 20px;
  }

  .hero-stats {
    gap: 10px;
  }

  .stat-item {
    padding: 14px 10px;
  }

  .search-form {
    display: none;
  }

  .article-card,
  .news-item {
    padding: 20px;
  }

  .news-item {
    padding-left: 26px;
  }

  #back-to-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }

  blockquote {
    padding: 18px 18px 18px 46px;
  }
}

@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 {
  #site-header,
  #back-to-top,
  #site-footer {
    display: none;
  }

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

  .section {
    margin-top: 24px;
  }
}