:root {
  --brand-gold: #f4c430;
  --brand-gold-dark: #d4a017;
  --brand-dark: #1a1a2e;
  --brand-dark-2: #16213e;
  --brand-dark-3: #0f3460;
  --brand-purple: #533483;
  --brand-pink: #e94560;
  --brand-blue: #2b6cb0;
  --brand-cyan: #00b4d8;
  --bg-body: #f5f6fa;
  --bg-card: #ffffff;
  --bg-card-hover: #fafbff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-dark: rgba(26, 26, 46, 0.65);
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #8888a0;
  --text-inverse: #ffffff;
  --border-light: rgba(0, 0, 0, 0.08);
  --border-glass: rgba(255, 255, 255, 0.35);
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.10);
  --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.14);
  --shadow-glow: 0 0 24px rgba(244, 196, 48, 0.35);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --radius-pill: 999px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1200px;
  --header-height: 68px;
}

[data-theme="dark"] {
  --bg-body: #0d0d1a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #222240;
  --bg-glass: rgba(26, 26, 46, 0.72);
  --bg-glass-dark: rgba(13, 13, 26, 0.8);
  --text-primary: #eaeaf2;
  --text-secondary: #b0b0c8;
  --text-muted: #6a6a88;
  --text-inverse: #1a1a2e;
  --border-light: rgba(255, 255, 255, 0.08);
  --border-glass: rgba(255, 255, 255, 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(244, 196, 48, 0.25);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background: var(--bg-body);
  transition: background var(--transition-smooth), color var(--transition-smooth);
  overflow-x: hidden;
  min-height: 100vh;
}

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

a {
  color: var(--brand-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--brand-pink);
}

ul, ol {
  list-style: none;
}

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

input, button {
  font-size: inherit;
}

h1, h2, h3, h4 {
  line-height: 1.35;
  font-weight: 700;
  color: var(--text-primary);
}

h1 { font-size: clamp(1.6rem, 4vw, 2.6rem); }
h2 { font-size: clamp(1.35rem, 3vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2.2vw, 1.4rem); }

p {
  margin-bottom: 0.85em;
  color: var(--text-secondary);
}

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

/* ==================== 顶部导航 ==================== */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--bg-glass);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--border-light);
  transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
}

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

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text-primary);
  white-space: nowrap;
  transition: transform var(--transition-bounce);
}

.brand:hover {
  transform: scale(1.04);
  color: var(--text-primary);
}

.brand svg {
  flex-shrink: 0;
  border-radius: 50%;
  transition: transform var(--transition-smooth);
}

.brand:hover svg {
  transform: rotate(-12deg) scale(1.08);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}

.nav-links li a {
  position: relative;
  display: block;
  padding: 8px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.nav-links li a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand-gold), var(--brand-pink));
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition-smooth);
}

.nav-links li a:hover {
  color: var(--text-primary);
  background: rgba(244, 196, 48, 0.08);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-pill);
  overflow: hidden;
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.search-box:focus-within {
  border-color: var(--brand-gold);
  box-shadow: var(--shadow-glow);
}

.search-box input {
  border: none;
  outline: none;
  background: transparent;
  padding: 8px 16px;
  font-size: 0.85rem;
  color: var(--text-primary);
  width: 180px;
  transition: width var(--transition-smooth);
}

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

.search-box input:focus {
  width: 220px;
}

.search-box button {
  padding: 8px 16px;
  background: linear-gradient(135deg, var(--brand-gold), var(--brand-gold-dark));
  color: var(--brand-dark);
  font-size: 0.82rem;
  font-weight: 700;
  transition: filter var(--transition-fast);
  white-space: nowrap;
}

.search-box button:hover {
  filter: brightness(1.1);
}

#darkToggle,
#menuToggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  transition: transform var(--transition-bounce), box-shadow var(--transition-fast), background var(--transition-fast);
}

#darkToggle:hover,
#menuToggle:hover {
  transform: scale(1.12) rotate(8deg);
  box-shadow: var(--shadow-md);
}

#menuToggle {
  display: none;
}

/* ==================== 主体 ==================== */
main {
  padding-top: var(--header-height);
}

section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 20px;
}

section > h2 {
  position: relative;
  margin-bottom: 28px;
  padding-left: 18px;
}

section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 70%;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--brand-gold), var(--brand-pink), var(--brand-purple));
}

/* ==================== Banner ==================== */
#banner {
  position: relative;
  max-width: none;
  margin: 0;
  padding: 72px 20px 64px;
  background: linear-gradient(135deg, var(--brand-dark) 0%, var(--brand-dark-2) 40%, var(--brand-dark-3) 70%, var(--brand-purple) 100%);
  overflow: hidden;
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

#banner::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(244, 196, 48, 0.22) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 8s ease-in-out infinite;
}

#banner::after {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.18) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, 30px) scale(1.08); }
}

.banner-slides {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: 320px;
  z-index: 2;
}

.banner-slide {
  display: none;
  animation: fadeSlideUp 0.7s ease forwards;
  max-width: 820px;
}

.banner-slide.active {
  display: block;
}

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

.banner-slide h1,
.banner-slide h2 {
  color: #fff;
  margin-bottom: 18px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.banner-slide h1 {
  background: linear-gradient(120deg, #fff 30%, var(--brand-gold) 70%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.banner-slide p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.98rem;
  margin-bottom: 14px;
}

.banner-slide .cta {
  display: inline-block;
  margin-top: 12px;
  padding: 13px 34px;
  background: linear-gradient(135deg, var(--brand-gold), var(--brand-gold-dark));
  color: var(--brand-dark);
  font-weight: 800;
  font-size: 0.95rem;
  border-radius: var(--radius-pill);
  box-shadow: 0 8px 24px rgba(244, 196, 48, 0.4);
  transition: transform var(--transition-bounce), box-shadow var(--transition-smooth);
}

.banner-slide .cta:hover {
  transform: translateY(-4px) scale(1.04);
  box-shadow: 0 14px 36px rgba(244, 196, 48, 0.55);
  color: var(--brand-dark);
}

.banner-dots {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  margin: 36px auto 0;
  display: flex;
  gap: 10px;
}

.banner-dots button {
  width: 38px;
  height: 6px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.28);
  transition: background var(--transition-smooth), width var(--transition-smooth);
}

.banner-dots button[aria-selected="true"] {
  width: 56px;
  background: linear-gradient(90deg, var(--brand-gold), var(--brand-pink));
}

.banner-dots button:hover {
  background: rgba(255, 255, 255, 0.5);
}

/* ==================== 面包屑 ==================== */
#breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 20px 0;
}

#breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

#breadcrumb li + li::before {
  content: "›";
  margin-right: 6px;
  color: var(--text-muted);
}

#breadcrumb a {
  color: var(--text-secondary);
  padding: 2px 4px;
  border-radius: 4px;
  transition: color var(--transition-fast), background var(--transition-fast);
}

#breadcrumb a:hover {
  color: var(--brand-pink);
  background: rgba(233, 69, 96, 0.08);
}

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

/* ==================== 数据指标 ==================== */
#stats {
  padding-top: 40px;
}

#stats > h2 {
  text-align: center;
  padding-left: 0;
}

#stats > h2::before {
  display: none;
}

#stats ul {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

#stats li {
  position: relative;
  padding: 32px 20px;
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform var(--transition-bounce), box-shadow var(--transition-smooth), background var(--transition-smooth);
}

#stats li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--brand-gold), var(--brand-pink), var(--brand-purple));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-smooth);
}

#stats li:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  background: var(--bg-card-hover);
}

#stats li:hover::before {
  transform: scaleX(1);
}

#stats .num {
  display: block;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 900;
  background: linear-gradient(135deg, var(--brand-gold), var(--brand-pink));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

#stats span {
  display: block;
  margin-top: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ==================== 通用卡片样式 ==================== */
#intro,
#products,
#solutions,
#cases,
#articles,
#howto,
#faq,
#contact,
#sitemap,
#legal {
  position: relative;
}

#intro h3,
#products h3,
#solutions h3,
#cases h3,
#howto h3,
#contact h3,
#sitemap h3,
#legal h3 {
  margin: 28px 0 12px;
  padding-left: 14px;
  border-left: 4px solid var(--brand-gold);
  color: var(--text-primary);
}

#intro ul,
#products ul,
#solutions ul,
#howto ul,
#contact ul,
#sitemap ul {
  margin: 12px 0 20px;
  display: grid;
  gap: 10px;
}

#intro ul li,
#products ul li,
#solutions ul li,
#howto ul li,
#contact ul li,
#sitemap ul li {
  position: relative;
  padding: 12px 16px 12px 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

#intro ul li::before,
#products ul li::before,
#solutions ul li::before,
#howto ul li::before,
#contact ul li::before,
#sitemap ul li::before {
  content: "◆";
  position: absolute;
  left: 16px;
  top: 12px;
  color: var(--brand-gold);
  font-size: 0.7rem;
}

#intro ul li:hover,
#products ul li:hover,
#solutions ul li:hover,
#howto ul li:hover,
#contact ul li:hover,
#sitemap ul li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand-gold);
}

#intro ul li strong,
#products ul li strong,
#solutions ul li strong,
#contact ul li strong {
  color: var(--text-primary);
}

/* ==================== 文章列表 ==================== */
#articles > p {
  margin-bottom: 28px;
}

#articles article {
  position: relative;
  margin-bottom: 20px;
  padding: 24px 26px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--brand-gold), var(--brand-pink));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition-smooth);
}

#articles article:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(244, 196, 48, 0.4);
}

#articles article:hover::before {
  transform: scaleY(1);
}

#articles article h3 {
  margin-bottom: 8px;
  padding-left: 0;
  border-left: none;
  font-size: 1.12rem;
  transition: color var(--transition-fast);
}

#articles article:hover h3 {
  color: var(--brand-gold-dark);
}

#articles article time {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 12px;
  font-size: 0.78rem;
  color: var(--brand-dark);
  background: linear-gradient(135deg, rgba(244, 196, 48, 0.25), rgba(233, 69, 96, 0.15));
  border-radius: var(--radius-pill);
}

#articles article p {
  font-size: 0.9rem;
  margin-bottom: 12px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--brand-pink);
  transition: gap var(--transition-fast), color var(--transition-fast);
}

#articles article a::after {
  content: "→";
  transition: transform var(--transition-fast);
}

#articles article a:hover {
  gap: 10px;
  color: var(--brand-gold-dark);
}

#articles article a:hover::after {
  transform: translateX(4px);
}

/* ==================== HowTo ==================== */
#howto ol {
  counter-reset: step;
  display: grid;
  gap: 14px;
  margin: 18px 0 24px;
}

#howto ol li {
  position: relative;
  counter-increment: step;
  padding: 18px 20px 18px 64px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  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: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--brand-dark);
  background: linear-gradient(135deg, var(--brand-gold), var(--brand-gold-dark));
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(244, 196, 48, 0.35);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand-gold);
}

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

#faq details[open] {
  border-color: rgba(244, 196, 48, 0.5);
  box-shadow: var(--shadow-md);
}

#faq summary {
  position: relative;
  padding: 18px 52px 18px 22px;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--brand-dark);
  background: linear-gradient(135deg, var(--brand-gold), var(--brand-gold-dark));
  border-radius: 50%;
  transition: transform var(--transition-smooth), background var(--transition-smooth);
}

#faq details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
}

#faq summary:hover {
  background: rgba(244, 196, 48, 0.08);
  color: var(--brand-gold-dark);
}

#faq details p {
  padding: 0 22px 20px;
  font-size: 0.9rem;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==================== 客户评价 ==================== */
#cases blockquote {
  position: relative;
  margin: 16px 0;
  padding: 22px 24px 22px 56px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

#cases blockquote::before {
  content: "“";
  position: absolute;
  left: 18px;
  top: 8px;
  font-size: 3rem;
  line-height: 1;
  color: var(--brand-gold);
  opacity: 0.6;
  font-family: Georgia, serif;
}

#cases blockquote p {
  margin: 0;
  font-size: 0.92rem;
  font-style: italic;
  color: var(--text-secondary);
}

#cases blockquote:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* ==================== 联系 & 地图 & 法律 ==================== */
#contact a {
  font-weight: 600;
  border-bottom: 1px dashed var(--brand-gold);
}

#contact a:hover {
  border-bottom-style: solid;
  color: var(--brand-pink);
}

#legal p {
  font-size: 0.9rem;
}

/* ==================== 页脚 ==================== */
#site-footer {
  position: relative;
  margin-top: 40px;
  padding: 48px 20px 36px;
  background: linear-gradient(135deg, var(--brand-dark) 0%, var(--brand-dark-2) 50%, var(--brand-purple) 100%);
  color: rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: -60%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(244, 196, 48, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.footer-inner {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
  z-index: 2;
}

#site-footer p {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.85rem;
  margin-bottom: 10px;
}

#site-footer a {
  color: var(--brand-gold);
  font-weight: 600;
  transition: color var(--transition-fast);
}

#site-footer a:hover {
  color: #fff;
}

/* ==================== 返回顶部 ==================== */
#backToTop {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--brand-dark);
  background: linear-gradient(135deg, var(--brand-gold), var(--brand-gold-dark));
  border-radius: 50%;
  box-shadow: 0 8px 24px rgba(244, 196, 48, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
  transition: opacity var(--transition-smooth), transform var(--transition-bounce), visibility var(--transition-smooth), box-shadow var(--transition-fast);
}

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

#backToTop:hover {
  transform: translateY(-6px) scale(1.1);
  box-shadow: 0 14px 32px rgba(244, 196, 48, 0.6);
}

/* ==================== 滚动动画 ==================== */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ==================== 响应式 - 平板 ==================== */
@media (max-width: 1024px) {
  .nav-links {
    gap: 0;
  }
  .nav-links li a {
    padding: 8px 8px;
    font-size: 0.84rem;
  }
  .search-box input {
    width: 140px;
  }
  .search-box input:focus {
    width: 170px;
  }
  #stats ul {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ==================== 响应式 - 手机 ==================== */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .nav-inner {
    padding: 0 14px;
    gap: 8px;
  }

  .brand span {
    display: none;
  }

  .brand svg {
    width: 32px;
    height: 32px;
  }

  #menuToggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 16px 20px;
    background: var(--bg-glass);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--transition-smooth), opacity var(--transition-smooth), visibility var(--transition-smooth);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-links li a {
    padding: 13px 16px;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
  }

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

  .search-box {
    display: none;
  }

  #banner {
    padding: 48px 16px 44px;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  }

  .banner-slides {
    min-height: 260px;
  }

  .banner-slide p {
    font-size: 0.9rem;
  }

  section {
    padding: 40px 16px;
  }

  #stats ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  #stats li {
    padding: 24px 14px;
  }

  #articles article {
    padding: 20px 18px;
  }

  #howto ol li {
    padding: 16px 16px 16px 58px;
  }

  #faq summary {
    padding: 16px 48px 16px 18px;
    font-size: 0.92rem;
  }

  #faq details p {
    padding: 0 18px 18px;
  }

  #cases blockquote {
    padding: 20px 18px 20px 50px;
  }

  #backToTop {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 420px) {
  #stats ul {
    grid-template-columns: 1fr;
  }

  .banner-slide .cta {
    padding: 11px 26px;
    font-size: 0.88rem;
  }
}

/* ==================== 无障碍与动效偏好 ==================== */
@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;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

::selection {
  background: rgba(244, 196, 48, 0.35);
  color: var(--text-primary);
}

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

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--brand-gold), var(--brand-pink));
  border-radius: var(--radius-pill);
  border: 2px solid var(--bg-body);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--brand-gold-dark), var(--brand-purple));
}

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