:root {
  --color-primary: #1f6f54;
  --color-primary-light: #2e8b6a;
  --color-primary-dark: #164f3c;
  --color-accent: #f2c14e;
  --color-accent-light: #f7d47a;
  --color-bg: #f4f7f5;
  --color-bg-alt: #ffffff;
  --color-bg-card: rgba(255, 255, 255, 0.72);
  --color-bg-glass: rgba(255, 255, 255, 0.55);
  --color-text: #1a2e28;
  --color-text-secondary: #4a6459;
  --color-text-muted: #7a948a;
  --color-border: rgba(31, 111, 84, 0.15);
  --color-border-strong: rgba(31, 111, 84, 0.3);
  --color-shadow: rgba(31, 111, 84, 0.1);
  --color-shadow-lg: rgba(31, 111, 84, 0.18);
  --gradient-hero: linear-gradient(135deg, #1f6f54 0%, #2e8b6a 40%, #3aa87e 70%, #f2c14e 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(244,247,245,0.7));
  --gradient-accent: linear-gradient(135deg, #f2c14e, #e8a838);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;
  --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);
  --header-height: 68px;
  --max-width: 1200px;
  --blur-amount: 16px;
}

[data-theme="dark"] {
  --color-primary: #3aa87e;
  --color-primary-light: #4cc794;
  --color-primary-dark: #2e8b6a;
  --color-accent: #f2c14e;
  --color-accent-light: #f7d47a;
  --color-bg: #0f1a16;
  --color-bg-alt: #16221d;
  --color-bg-card: rgba(22, 34, 29, 0.78);
  --color-bg-glass: rgba(22, 34, 29, 0.6);
  --color-text: #e8f0ec;
  --color-text-secondary: #a8c4b8;
  --color-text-muted: #6b8a7c;
  --color-border: rgba(58, 168, 126, 0.18);
  --color-border-strong: rgba(58, 168, 126, 0.35);
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-shadow-lg: rgba(0, 0, 0, 0.45);
  --gradient-hero: linear-gradient(135deg, #0f1a16 0%, #164f3c 40%, #1f6f54 70%, #8a6d2a 100%);
  --gradient-card: linear-gradient(145deg, rgba(22,34,29,0.9), rgba(15,26,22,0.7));
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-primary: #3aa87e;
    --color-primary-light: #4cc794;
    --color-primary-dark: #2e8b6a;
    --color-bg: #0f1a16;
    --color-bg-alt: #16221d;
    --color-bg-card: rgba(22, 34, 29, 0.78);
    --color-bg-glass: rgba(22, 34, 29, 0.6);
    --color-text: #e8f0ec;
    --color-text-secondary: #a8c4b8;
    --color-text-muted: #6b8a7c;
    --color-border: rgba(58, 168, 126, 0.18);
    --color-border-strong: rgba(58, 168, 126, 0.35);
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-lg: rgba(0, 0, 0, 0.45);
    --gradient-hero: linear-gradient(135deg, #0f1a16 0%, #164f3c 40%, #1f6f54 70%, #8a6d2a 100%);
    --gradient-card: linear-gradient(145deg, rgba(22,34,29,0.9), rgba(15,26,22,0.7));
  }
}

*,
*::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(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(circle at 10% 0%, rgba(31, 111, 84, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 90% 100%, rgba(242, 193, 78, 0.05) 0%, transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
  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-primary);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

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

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

ul, ol {
  list-style: none;
}

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

h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2.2vw, 1.45rem); }
h4 { font-size: clamp(1rem, 1.8vw, 1.2rem); }

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

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

::selection {
  background: var(--color-accent);
  color: #1a2e28;
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-full);
  border: 2px solid var(--color-bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-light);
}

#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--color-bg-glass);
  backdrop-filter: blur(var(--blur-amount)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--blur-amount)) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#site-header.scrolled {
  box-shadow: 0 4px 24px var(--color-shadow);
  background: var(--color-bg-card);
}

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

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

.brand:hover {
  transform: scale(1.03);
  color: var(--color-text);
}

.brand svg {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px var(--color-shadow);
  transition: box-shadow var(--transition-base);
}

.brand:hover svg {
  box-shadow: 0 6px 20px var(--color-shadow-lg);
}

.brand-name {
  font-size: 1.3rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.02em;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  position: relative;
  transition: all var(--transition-fast);
}

.nav-list li a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

.nav-list li a:hover {
  color: var(--color-primary);
  background: rgba(31, 111, 84, 0.08);
  transform: translateY(-1px);
}

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

.site-search {
  display: flex;
  align-items: center;
  gap: 0;
  margin-left: auto;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-search:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(31, 111, 84, 0.12);
}

.site-search input {
  border: none;
  background: transparent;
  padding: 8px 16px;
  font-size: 0.88rem;
  color: var(--color-text);
  font-family: inherit;
  width: 180px;
  outline: none;
}

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

.site-search button {
  border: none;
  background: var(--gradient-accent);
  color: #1a2e28;
  padding: 8px 18px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: opacity var(--transition-fast);
}

.site-search button:hover {
  opacity: 0.88;
}

#theme-toggle,
#menu-toggle {
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  color: var(--color-text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

#theme-toggle:hover,
#menu-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(31, 111, 84, 0.08);
  transform: translateY(-1px);
}

#menu-toggle {
  display: none;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.breadcrumb {
  padding: 20px 0 8px;
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.breadcrumb ol li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb ol li:not(:last-child)::after {
  content: "/";
  color: var(--color-text-muted);
  opacity: 0.5;
}

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

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

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

#hero {
  position: relative;
  padding: 48px 40px 56px;
  margin: 16px 0 48px;
  border-radius: var(--radius-xl);
  background: var(--gradient-hero);
  color: #ffffff;
  overflow: hidden;
  box-shadow: 0 20px 60px var(--color-shadow-lg);
  animation: heroFadeIn 0.8s ease-out both;
}

#hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(242,193,78,0.2) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

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

#hero h1 {
  position: relative;
  z-index: 1;
  color: #ffffff;
  margin-bottom: 20px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
  max-width: 800px;
}

.hero-lead {
  position: relative;
  z-index: 1;
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.92);
  max-width: 720px;
  margin-bottom: 28px;
}

.hero-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 40px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  text-align: center;
}

.btn-primary {
  background: #ffffff;
  color: var(--color-primary-dark);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
  color: var(--color-primary-dark);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.28);
  transform: translateY(-3px);
  color: #ffffff;
  border-color: #ffffff;
}

.hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

.hero-stats li {
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 18px 14px;
  text-align: center;
  transition: transform var(--transition-base), background var(--transition-base);
}

.hero-stats li:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.2);
}

.hero-stats strong {
  display: block;
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  font-weight: 800;
  color: #ffffff;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.hero-stats span {
  display: block;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.8);
  margin-top: 4px;
}

.hero-figure {
  position: relative;
  z-index: 1;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition-slow);
}

.hero-figure:hover {
  transform: scale(1.015);
}

.hero-figure svg {
  width: 100%;
  height: auto;
  display: block;
}

.hero-figure figcaption {
  padding: 12px 20px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.96);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

section {
  margin-bottom: 56px;
  animation: sectionFadeIn 0.7s ease-out both;
}

section:nth-child(odd) {
  animation-delay: 0.05s;
}

@keyframes sectionFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

section > h2 {
  position: relative;
  padding-bottom: 14px;
  margin-bottom: 28px;
  color: var(--color-text);
}

section > h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 64px;
  height: 4px;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
}

section > h3 {
  margin: 28px 0 12px;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

section > h3::before {
  content: "";
  width: 4px;
  height: 1em;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

section > h4 {
  margin: 20px 0 8px;
  color: var(--color-text);
  font-weight: 600;
}

section > p {
  max-width: 900px;
  line-height: 1.85;
}

#about,
#products,
#solutions,
#cases,
#news,
#articles,
#faq,
#howto,
#contact,
#sitemap,
#friend-links {
  background: var(--color-bg-card);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  box-shadow: 0 4px 24px var(--color-shadow);
  transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

#about:hover,
#products:hover,
#solutions:hover,
#cases:hover,
#news:hover,
#articles:hover,
#faq:hover,
#howto:hover,
#contact:hover {
  box-shadow: 0 8px 40px var(--color-shadow-lg);
  border-color: var(--color-border-strong);
}

#products ul,
#solutions ul,
#howto ul,
#howto ol {
  display: grid;
  gap: 10px;
  margin: 16px 0;
}

#products ul li,
#solutions ul li {
  position: relative;
  padding: 12px 16px 12px 44px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

#products ul li::before,
#solutions ul li::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gradient-accent);
  box-shadow: 0 0 0 3px rgba(242, 193, 78, 0.2);
}

#products ul li:hover,
#solutions ul li:hover {
  transform: translateX(6px);
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px var(--color-shadow);
}

#howto ol {
  counter-reset: howto-counter;
  list-style: none;
}

#howto ol li {
  position: relative;
  padding: 14px 16px 14px 56px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  counter-increment: howto-counter;
  transition: all var(--transition-fast);
}

#howto ol li::before {
  content: counter(howto-counter);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--gradient-hero);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 10px var(--color-shadow);
}

#howto ol li:hover {
  transform: translateX(6px);
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px var(--color-shadow);
}

#howto ul li {
  position: relative;
  padding: 10px 16px 10px 40px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.92rem;
  transition: all var(--transition-fast);
}

#howto ul li::before {
  content: "✓";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.9rem;
}

#howto ul li:hover {
  transform: translateX(6px);
  border-color: var(--color-primary);
}

#cases blockquote {
  position: relative;
  margin: 18px 0;
  padding: 22px 24px 22px 64px;
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 16px var(--color-shadow);
  transition: all var(--transition-base);
}

#cases blockquote::before {
  content: "\201C";
  position: absolute;
  left: 20px;
  top: 8px;
  font-size: 3.2rem;
  line-height: 1;
  color: var(--color-accent);
  font-family: Georgia, serif;
  opacity: 0.7;
}

#cases blockquote:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px var(--color-shadow-lg);
  border-left-color: var(--color-primary);
}

#cases blockquote p {
  margin: 0;
  color: var(--color-text-secondary);
  font-style: italic;
  line-height: 1.8;
}

.news-list {
  display: grid;
  gap: 16px;
}

.news-list li {
  padding: 20px 24px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.news-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-accent);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform var(--transition-base);
}

.news-list li:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px var(--color-shadow-lg);
  border-color: var(--color-primary);
}

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

.news-list li h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.news-list li h3 a {
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.news-list li h3 a:hover {
  color: var(--color-primary);
}

.news-list li p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.news-list li p:first-of-type {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 6px;
}

#articles {
  display: grid;
  gap: 20px;
}

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

#articles article {
  padding: 24px 26px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#articles article::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle at top right, rgba(242,193,78,0.15), transparent 70%);
  border-radius: 0 0 0 80px;
  transition: all var(--transition-base);
}

#articles article:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 36px var(--color-shadow-lg);
  border-color: var(--color-primary);
}

#articles article:hover::after {
  width: 120px;
  height: 120px;
}

#articles article h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

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

#articles article p {
  font-size: 0.92rem;
  line-height: 1.8;
  margin-bottom: 12px;
  flex: 1;
}

#articles article p:first-of-type {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 8px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary);
  align-self: flex-start;
  transition: gap var(--transition-fast);
}

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

#articles article a:hover {
  gap: 10px;
}

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

#faq details {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all var(--transition-base);
}

#faq details[open] {
  border-color: var(--color-primary);
  box-shadow: 0 6px 24px var(--color-shadow);
}

#faq summary {
  padding: 18px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--color-text);
  list-style: none;
  position: relative;
  padding-right: 52px;
  transition: color var(--transition-fast), background var(--transition-fast);
  user-select: none;
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(31, 111, 84, 0.1);
  color: var(--color-primary);
  font-size: 1.2rem;
  font-weight: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  line-height: 1;
}

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

#faq summary:hover {
  color: var(--color-primary);
  background: rgba(31, 111, 84, 0.04);
}

#faq details p {
  padding: 0 24px 20px;
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--color-text-secondary);
  animation: faqSlideDown 0.3s ease-out;
}

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

#contact address {
  font-style: normal;
  display: grid;
  gap: 12px;
  margin-bottom: 28px;
}

#contact address p {
  position: relative;
  padding: 14px 18px 14px 48px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin: 0;
  font-size: 0.92rem;
  transition: all var(--transition-fast);
}

#contact address p::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-accent);
}

#contact address p:hover {
  transform: translateX(6px);
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px var(--color-shadow);
}

#contact address a {
  font-weight: 500;
}

#sitemap ul,
#friend-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

#sitemap ul li a,
#friend-links ul li a {
  display: inline-block;
  padding: 8px 18px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

#sitemap ul li a:hover,
#friend-links ul li a:hover {
  background: var(--gradient-hero);
  color: #ffffff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px var(--color-shadow);
}

#site-footer {
  margin-top: 56px;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 48px 24px 32px;
  transition: background var(--transition-base), border-color var(--transition-base);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.footer-inner section h2 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--color-text);
  position: relative;
  padding-bottom: 10px;
}

.footer-inner section h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
}

.footer-inner section p {
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.footer-inner section ul {
  display: grid;
  gap: 8px;
}

.footer-inner section ul li a {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  display: inline-block;
}

.footer-inner section ul li a:hover {
  color: var(--color-primary);
  transform: translateX(4px);
}

#site-footer > section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

#site-footer > section:last-of-type {
  border-bottom: none;
}

#site-footer > section h2 {
  font-size: 0.95rem;
  margin-bottom: 8px;
  color: var(--color-text);
}

#site-footer > section p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin: 0;
}

#back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--gradient-hero);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 6px 24px var(--color-shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: all var(--transition-base);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1.2;
  text-align: center;
  padding: 4px;
}

#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 10px 32px var(--color-shadow-lg);
}

#back-to-top:active {
  transform: translateY(-2px) scale(1.02);
}

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

  .nav-list li a {
    padding: 7px 10px;
    font-size: 0.84rem;
  }

  .site-search input {
    width: 130px;
  }

  .hero-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
  }

  .hero-stats li {
    padding: 14px 10px;
  }

  #hero {
    padding: 36px 28px 44px;
  }
}

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

  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 16px;
    gap: 10px;
  }

  #site-header {
    height: auto;
    position: sticky;
  }

  .brand-name {
    font-size: 1.1rem;
  }

  .brand svg {
    width: 34px;
    height: 34px;
  }

  #menu-toggle {
    display: block;
    margin-left: auto;
  }

  #theme-toggle {
    order: 3;
  }

  nav[aria-label="主导航"] {
    order: 5;
    width: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
  }

  nav[aria-label="主导航"].open {
    max-height: 500px;
  }

  .nav-list {
    flex-direction: column;
    gap: 4px;
    padding: 8px 0;
  }

  .nav-list li {
    width: 100%;
  }

  .nav-list li a {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 0.92rem;
  }

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

  .site-search {
    order: 4;
    width: 100%;
    margin-left: 0;
  }

  .site-search input {
    flex: 1;
    width: auto;
  }

  main {
    padding: 0 16px;
  }

  #hero {
    padding: 28px 20px 36px;
    margin: 12px 0 32px;
    border-radius: var(--radius-lg);
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    padding: 14px 24px;
  }

  #about,
  #products,
  #solutions,
  #cases,
  #news,
  #articles,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #friend-links {
    padding: 24px 18px;
    border-radius: var(--radius-lg);
  }

  section {
    margin-bottom: 36px;
  }

  section > h2 {
    margin-bottom: 20px;
  }

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

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    font-size: 0.68rem;
  }

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

  #cases blockquote {
    padding: 20px 18px 20px 52px;
  }

  #cases blockquote::before {
    left: 14px;
    font-size: 2.6rem;
  }

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

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

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

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

  .hero-stats strong {
    font-size: 1.25rem;
  }

  .hero-stats span {
    font-size: 0.72rem;
  }

  #hero h1 {
    font-size: 1.45rem;
  }

  .hero-lead {
    font-size: 0.9rem;
  }

  #sitemap ul li a,
  #friend-links ul li a {
    padding: 7px 14px;
    font-size: 0.8rem;
  }
}

@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,
  #theme-toggle,
  #menu-toggle,
  .site-search,
  .hero-actions,
  .breadcrumb {
    display: none !important;
  }

  body {
    background: #ffffff;
    color: #000000;
  }

  #hero {
    background: #f0f0f0;
    color: #000000;
    box-shadow: none;
  }

  #hero h1,
  .hero-lead {
    color: #000000;
  }

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