:root {
  --brand-primary: #e94560;
  --brand-primary-dark: #c7314a;
  --brand-secondary: #f2a365;
  --brand-accent: #58a6ff;
  --bg-base: #f5f6fa;
  --bg-elevated: #ffffff;
  --bg-soft: #eef0f7;
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a63;
  --text-muted: #7a7a92;
  --border-color: rgba(26, 26, 46, 0.1);
  --shadow-sm: 0 2px 10px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 10px 30px rgba(26, 26, 46, 0.1);
  --shadow-lg: 0 20px 50px rgba(26, 26, 46, 0.16);
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(255, 255, 255, 0.5);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #2d2d44 45%, #16213e 100%);
  --gradient-brand: linear-gradient(120deg, #e94560 0%, #f2a365 100%);
  --gradient-accent: linear-gradient(120deg, #58a6ff 0%, #e94560 100%);
  --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --transition-fast: 0.2s ease;
  --transition-base: 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
  --max-width: 1200px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-base: #10101c;
    --bg-elevated: #1a1a2e;
    --bg-soft: #22223a;
    --text-primary: #f2f2f8;
    --text-secondary: #c2c2d6;
    --text-muted: #8a8aa6;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.6);
    --glass-bg: rgba(26, 26, 46, 0.6);
    --glass-border: rgba(255, 255, 255, 0.12);
  }
}

html.dark-mode {
  --bg-base: #10101c;
  --bg-elevated: #1a1a2e;
  --bg-soft: #22223a;
  --text-primary: #f2f2f8;
  --text-secondary: #c2c2d6;
  --text-muted: #8a8aa6;
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.6);
  --glass-bg: rgba(26, 26, 46, 0.6);
  --glass-border: rgba(255, 255, 255, 0.12);
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background-color: var(--bg-base);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(233, 69, 96, 0.08), transparent 42%),
    radial-gradient(circle at 88% 0%, rgba(88, 166, 255, 0.08), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(242, 163, 101, 0.06), transparent 50%);
  background-attachment: fixed;
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

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

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

a:hover,
a:focus-visible {
  color: var(--brand-secondary);
}

ul,
ol {
  padding-left: 1.25em;
}

h1,
h2,
h3,
h4 {
  line-height: 1.35;
  color: var(--text-primary);
  margin: 0 0 0.6em;
  font-weight: 700;
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
}

h2 {
  font-size: clamp(1.35rem, 3vw, 2rem);
  position: relative;
  padding-left: 0.85em;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: var(--radius-pill);
  background: var(--gradient-brand);
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  color: var(--text-primary);
}

p {
  margin: 0 0 1em;
  color: var(--text-secondary);
}

strong {
  color: var(--text-primary);
}

blockquote {
  margin: 1.2em 0;
  padding: 1em 1.4em;
  border-left: 4px solid var(--brand-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--glass-border);
  border-right: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

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

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

/* ============ 顶部栏 ============ */
.topbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5em 2em;
  padding: 0.5em 1.5em;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.85);
  background: linear-gradient(90deg, #1a1a2e 0%, #2d2d44 50%, #16213e 100%);
}

.topbar span {
  position: relative;
  white-space: nowrap;
}

.topbar span + span::before {
  content: "";
  position: absolute;
  left: -1em;
  top: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--brand-primary);
  transform: translateY(-50%);
}

/* ============ 头部导航 ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

#site-header nav {
  display: flex;
  align-items: center;
  gap: 1.25em;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75em 1.5em;
  flex-wrap: wrap;
}

.logo a {
  display: inline-flex;
  align-items: center;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  white-space: nowrap;
}

.logo a::before {
  content: "♠";
  -webkit-text-fill-color: var(--brand-primary);
  color: var(--brand-primary);
  margin-right: 0.25em;
  font-size: 1.1em;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25em;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1 1 auto;
}

.nav-list li {
  margin: 0;
}

.nav-list a {
  display: inline-block;
  padding: 0.4em 0.75em;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-pill);
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0.15em;
  width: 0;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--gradient-brand);
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--brand-primary);
  background: rgba(233, 69, 96, 0.08);
  transform: translateY(-1px);
}

.nav-list a:hover::after {
  width: 55%;
}

.nav-tools {
  display: flex;
  align-items: center;
  gap: 0.6em;
  flex-wrap: wrap;
}

.nav-tools input[type="search"] {
  padding: 0.45em 1em;
  font-size: 0.85rem;
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-soft);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  min-width: 140px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.nav-tools input[type="search"]::placeholder {
  color: var(--text-muted);
}

.nav-tools input[type="search"]:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.18);
  background: var(--bg-elevated);
}

.nav-tools button {
  padding: 0.45em 1em;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-brand);
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 4px 14px rgba(233, 69, 96, 0.28);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

.nav-tools button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(233, 69, 96, 0.4);
  filter: brightness(1.05);
}

.nav-tools button:active {
  transform: translateY(0);
}

#mobile-toggle {
  display: none;
  background: var(--gradient-accent);
  box-shadow: 0 4px 14px rgba(88, 166, 255, 0.3);
}

/* ============ 主内容容器 ============ */
main {
  display: block;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2em 1.5em 3em;
}

main > section,
main > nav {
  margin-bottom: 2.5em;
  scroll-margin-top: 110px;
}

/* ============ 首屏 Hero ============ */
.hero {
  position: relative;
  padding: 2.5em 2em;
  border-radius: var(--radius-lg);
  background: var(--gradient-hero);
  color: #f2f2f8;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(233, 69, 96, 0.35), transparent 45%),
    radial-gradient(circle at 85% 15%, rgba(88, 166, 255, 0.3), transparent 45%),
    radial-gradient(circle at 60% 90%, rgba(242, 163, 101, 0.25), transparent 50%);
  z-index: -1;
  animation: heroGlow 12s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% { opacity: 0.7; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.08); }
}

.hero h1 {
  color: #fff;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.35);
  animation: fadeUp 0.7s ease both;
}

.hero > p {
  max-width: 60em;
  color: rgba(242, 242, 248, 0.88);
  animation: fadeUp 0.7s ease 0.1s both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Banner 轮播 */
.hero-carousel {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(280px, 1fr);
  gap: 1.25em;
  margin-top: 1.75em;
  overflow-x: auto;
  padding-bottom: 0.75em;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--brand-primary) transparent;
}

.hero-carousel::-webkit-scrollbar {
  height: 6px;
}

.hero-carousel::-webkit-scrollbar-thumb {
  background: var(--brand-primary);
  border-radius: var(--radius-pill);
}

.hero-carousel figure {
  margin: 0;
  scroll-snap-align: center;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hero-carousel figure:hover {
  transform: translateY(-6px) scale(1.015);
  box-shadow: 0 22px 44px rgba(0, 0, 0, 0.45);
}

.hero-carousel img {
  width: 100%;
  aspect-ratio: 800 / 320;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.hero-carousel figure:hover img {
  transform: scale(1.05);
}

.hero-carousel figcaption {
  padding: 0.75em 1em;
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.02em;
  background: linear-gradient(90deg, rgba(233, 69, 96, 0.35), rgba(88, 166, 255, 0.2));
}

/* 数据统计条 */
.stat-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1em;
  margin-top: 2em;
  padding: 1.25em 1em;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.stat-bar > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.15em;
  padding: 0.35em;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.stat-bar > div:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-3px);
}

.stat-bar .counter {
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 800;
  line-height: 1.1;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.stat-bar span {
  font-size: 0.8rem;
  color: rgba(242, 242, 248, 0.8);
  letter-spacing: 0.03em;
}

/* ============ 面包屑 ============ */
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
  list-style: none;
  margin: 0;
  padding: 0.65em 1em;
  font-size: 0.85rem;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  color: var(--text-muted);
}

.breadcrumb li + li::before {
  content: "›";
  margin-right: 0.5em;
  color: var(--brand-primary);
  font-weight: 700;
}

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

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

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

/* ============ 通用区块卡片化 ============ */
#about,
#products,
#solutions,
#cases,
#news,
#articles,
#howto,
#faq,
#contact,
#sitemap,
#links {
  padding: 2em;
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

#about:hover,
#products:hover,
#solutions:hover,
#cases:hover,
#news:hover,
#articles:hover,
#howto:hover,
#faq:hover,
#contact:hover {
  box-shadow: var(--shadow-lg);
}

#about h3,
#products h3,
#solutions h3,
#cases h3,
#howto h3,
#contact h3 {
  margin-top: 1.4em;
  padding-bottom: 0.35em;
  border-bottom: 1px dashed var(--border-color);
}

#about h3:first-of-type,
#products h3:first-of-type,
#solutions h3:first-of-type,
#cases h3:first-of-type,
#howto h3:first-of-type,
#contact h3:first-of-type {
  margin-top: 0.6em;
}

#about ul,
#products ul,
#solutions ul,
#howto ul,
#howto ol {
  margin: 0 0 1em;
  padding-left: 0;
  list-style: none;
}

#about ul li,
#products ul li,
#solutions ul li,
#howto ul li {
  position: relative;
  padding: 0.4em 0 0.4em 1.75em;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

#about ul li::before,
#products ul li::before,
#solutions ul li::before,
#howto ul li::before {
  content: "♠";
  position: absolute;
  left: 0.35em;
  top: 0.4em;
  color: var(--brand-primary);
  font-size: 0.85em;
}

#about ul li:hover,
#products ul li:hover,
#solutions ul li:hover,
#howto ul li:hover {
  background: var(--bg-soft);
  transform: translateX(4px);
}

#howto ol {
  counter-reset: step;
}

#howto ol li {
  position: relative;
  counter-increment: step;
  padding: 0.55em 0 0.55em 2.6em;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 1.7em;
  height: 1.7em;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8em;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-brand);
  border-radius: 50%;
  box-shadow: 0 3px 10px rgba(233, 69, 96, 0.3);
}

#howto ol li:hover {
  background: var(--bg-soft);
  transform: translateX(4px);
}

/* ============ 案例评价 ============ */
#cases blockquote {
  position: relative;
  padding-left: 2.6em;
}

#cases blockquote::before {
  content: "\201C";
  position: absolute;
  left: 0.45em;
  top: -0.1em;
  font-size: 2.6em;
  line-height: 1;
  color: var(--brand-primary);
  opacity: 0.6;
  font-family: Georgia, serif;
}

/* ============ 新闻 & 文章卡片 ============ */
#news,
#articles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25em;
  align-items: start;
}

#news > h2,
#articles > h2 {
  grid-column: 1 / -1;
  margin-bottom: 0.2em;
}

#news article,
#articles article {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.35em 1.35em 1.1em;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#news article::after,
#articles article::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--gradient-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

#news article:hover,
#articles article:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(233, 69, 96, 0.35);
}

#news article:hover::after,
#articles article:hover::after {
  transform: scaleX(1);
}

#news article h3,
#articles article h3 {
  font-size: 1.05rem;
  margin-bottom: 0.4em;
  padding: 0;
  border: none;
  transition: color var(--transition-fast);
}

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

#news article time,
#articles article time {
  display: inline-block;
  align-self: flex-start;
  margin-bottom: 0.7em;
  padding: 0.15em 0.7em;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--brand-primary);
  background: rgba(233, 69, 96, 0.1);
  border-radius: var(--radius-pill);
  letter-spacing: 0.02em;
}

#news article p,
#articles article p {
  font-size: 0.9rem;
  margin-bottom: 0.9em;
  flex: 1 1 auto;
}

#articles article a {
  align-self: flex-start;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.35em 1em;
  border-radius: var(--radius-pill);
  background: var(--bg-soft);
  color: var(--brand-primary);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

#articles article a:hover {
  background: var(--gradient-brand);
  color: #fff;
  transform: translateX(4px);
}

/* ============ FAQ 手风琴 ============ */
#faq details {
  margin-bottom: 0.8em;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

#faq details:hover {
  border-color: rgba(88, 166, 255, 0.4);
}

#faq details[open] {
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.35);
}

#faq summary {
  position: relative;
  padding: 1em 3em 1em 1.25em;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition-fast), background var(--transition-fast);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 1.1em;
  top: 50%;
  width: 1.6em;
  height: 1.6em;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--brand-primary);
  background: rgba(233, 69, 96, 0.1);
  border-radius: 50%;
  transform: translateY(-50%);
  transition: transform var(--transition-base), background var(--transition-fast), color var(--transition-fast);
}

#faq details[open] summary {
  color: var(--brand-primary);
  background: rgba(233, 69, 96, 0.05);
}

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

#faq details p {
  margin: 0;
  padding: 0 1.25em 1.25em;
  font-size: 0.92rem;
  animation: fadeUp 0.35s ease both;
}

/* ============ 联系信息 ============ */
#contact p {
  font-size: 0.95rem;
}

#contact h3 + p {
  padding: 1em 1.25em;
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border-left: 4px solid var(--brand-primary);
  line-height: 2;
}

/* ============ 网站地图 / 友情链接 ============ */
#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6em;
  list-style: none;
  margin: 0;
  padding: 0;
}

#sitemap a,
#links a {
  display: inline-block;
  padding: 0.4em 1em;
  font-size: 0.88rem;
  color: var(--text-secondary);
  background: var(--bg-soft);
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: var(--gradient-brand);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(233, 69, 96, 0.3);
}

/* ============ 页脚 ============ */
footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2em 1.5em 3em;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25em;
  color: var(--text-secondary);
}

footer section {
  padding: 1.5em;
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

footer section:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

footer h2 {
  font-size: 1.05rem;
  padding-left: 0;
  margin-bottom: 0.6em;
}

footer h2::before {
  display: none;
}

footer p {
  font-size: 0.85rem;
  margin: 0;
  color: var(--text-muted);
}

footer > p {
  grid-column: 1 / -1;
  text-align: center;
  padding: 1.25em;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
}

#back-to-top {
  grid-column: 1 / -1;
  justify-self: center;
  padding: 0.7em 2em;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  color: #fff;
  background: var(--gradient-brand);
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  box-shadow: 0 8px 22px rgba(233, 69, 96, 0.35);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

#back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 30px rgba(233, 69, 96, 0.45);
  filter: brightness(1.06);
}

#back-to-top:active {
  transform: translateY(0);
}

/* ============ 滚动动画 ============ */
@media (prefers-reduced-motion: no-preference) {
  #about,
  #products,
  #solutions,
  #cases,
  #news,
  #articles,
  #howto,
  #faq,
  #contact,
  #sitemap,
  #links,
  footer section {
    animation: revealUp 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
    animation-timeline: view();
    animation-range: entry 0% cover 32%;
  }

  @keyframes revealUp {
    from {
      opacity: 0;
      transform: translateY(36px) scale(0.985);
    }
    to {
      opacity: 1;
      transform: translateY(0) scale(1);
    }
  }
}

@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;
  }
}

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  #site-header nav {
    gap: 0.9em;
  }

  .nav-list a {
    padding: 0.35em 0.6em;
    font-size: 0.85rem;
  }

  .nav-tools input[type="search"] {
    min-width: 110px;
  }
}

@media (max-width: 860px) {
  .topbar {
    font-size: 0.72rem;
    gap: 0.3em 1.4em;
    padding: 0.45em 1em;
  }

  #site-header nav {
    padding: 0.65em 1em;
  }

  .nav-list {
    order: 3;
    flex-basis: 100%;
    justify-content: center;
    gap: 0.15em;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base), opacity var(--transition-base), padding var(--transition-base);
    opacity: 0;
  }

  .nav-list.is-open {
    max-height: 520px;
    opacity: 1;
    padding: 0.5em 0;
  }

  .nav-tools {
    margin-left: auto;
  }

  #mobile-toggle {
    display: inline-block;
  }

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

  main {
    padding: 1.5em 1em 2.5em;
  }

  .hero {
    padding: 1.75em 1.25em;
  }

  #about,
  #products,
  #solutions,
  #cases,
  #news,
  #articles,
  #howto,
  #faq,
  #contact,
  #sitemap,
  #links {
    padding: 1.4em 1.15em;
  }

  footer {
    padding: 1.5em 1em 2.5em;
  }
}

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

  .topbar {
    flex-direction: column;
    align-items: center;
    gap: 0.15em;
  }

  .topbar span + span::before {
    display: none;
  }

  .nav-tools input[type="search"] {
    flex: 1 1 100%;
    min-width: 0;
  }

  .nav-tools {
    flex-wrap: wrap;
    width: 100%;
    gap: 0.5em;
  }

  .nav-tools button {
    flex: 1 1 auto;
  }

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

  .hero-carousel {
    grid-auto-columns: 88%;
  }

  .stat-bar .counter {
    font-size: 1.5rem;
  }

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

  #faq summary {
    padding: 0.85em 2.6em 0.85em 1em;
    font-size: 0.92rem;
  }

  #faq summary::after {
    right: 0.8em;
    width: 1.4em;
    height: 1.4em;
  }

  #contact h3 + p {
    line-height: 1.9;
  }

  footer {
    grid-template-columns: 1fr;
  }
}
</style>