:root {
  --color-primary: #1F2937;
  --color-primary-light: #374151;
  --color-accent: #F97316;
  --color-accent-hover: #EA580C;
  --color-accent-soft: rgba(249, 115, 22, 0.12);
  --color-bg: #F9FAFB;
  --color-bg-alt: #FFFFFF;
  --color-bg-elevated: rgba(255, 255, 255, 0.72);
  --color-text: #111827;
  --color-text-secondary: #4B5563;
  --color-text-muted: #9CA3AF;
  --color-border: #E5E7EB;
  --color-border-strong: #D1D5DB;
  --color-shadow: rgba(17, 24, 39, 0.08);
  --color-shadow-lg: rgba(17, 24, 39, 0.14);
  --gradient-hero: linear-gradient(135deg, #1F2937 0%, #374151 45%, #F97316 130%);
  --gradient-accent: linear-gradient(135deg, #F97316 0%, #FB923C 100%);
  --gradient-card: linear-gradient(160deg, rgba(255,255,255,0.9) 0%, rgba(249,250,251,0.7) 100%);
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.65);
  --glass-blur: 18px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3.5rem;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition-base: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  --max-width: 1200px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #F9FAFB;
    --color-primary-light: #E5E7EB;
    --color-accent: #FB923C;
    --color-accent-hover: #F97316;
    --color-accent-soft: rgba(251, 146, 60, 0.16);
    --color-bg: #0B1120;
    --color-bg-alt: #111827;
    --color-bg-elevated: rgba(31, 41, 55, 0.72);
    --color-text: #F3F4F6;
    --color-text-secondary: #D1D5DB;
    --color-text-muted: #9CA3AF;
    --color-border: #1F2937;
    --color-border-strong: #374151;
    --color-shadow: rgba(0, 0, 0, 0.4);
    --color-shadow-lg: rgba(0, 0, 0, 0.6);
    --gradient-hero: linear-gradient(135deg, #0B1120 0%, #1F2937 45%, #C2410C 130%);
    --gradient-accent: linear-gradient(135deg, #FB923C 0%, #F97316 100%);
    --gradient-card: linear-gradient(160deg, rgba(31,41,55,0.9) 0%, rgba(17,24,39,0.7) 100%);
    --glass-bg: rgba(31, 41, 55, 0.55);
    --glass-border: rgba(75, 85, 99, 0.5);
  }
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(circle at 12% 8%, var(--color-accent-soft) 0%, transparent 42%),
    radial-gradient(circle at 88% 92%, rgba(31, 41, 55, 0.08) 0%, transparent 45%);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover,
a:focus-visible {
  color: var(--color-accent-hover);
  text-decoration: underline;
  text-underline-offset: 3px;
}

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: clamp(1.9rem, 4.2vw, 3rem);
  margin-bottom: var(--space-md);
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  margin-bottom: var(--space-md);
  position: relative;
  padding-bottom: var(--space-sm);
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: 4px;
  background: var(--gradient-accent);
  transition: width var(--transition-slow);
}

section:hover > h2::after {
  width: 96px;
}

h3 {
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

h4 {
  font-size: 1.05rem;
  margin-bottom: var(--space-xs);
  color: var(--color-text-secondary);
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
}

strong {
  color: var(--color-text);
  font-weight: 600;
}

blockquote {
  margin: var(--space-md) 0;
  padding: var(--space-md) var(--space-lg);
  border-left: 4px solid var(--color-accent);
  background: var(--gradient-card);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: 0 4px 20px var(--color-shadow);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

blockquote:hover {
  transform: translateX(6px);
  box-shadow: 0 8px 30px var(--color-shadow-lg);
}

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

blockquote p:last-child {
  margin-bottom: 0;
}

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 2px 24px var(--color-shadow);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
}

header nav > a[href="/"] {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  padding: 4px 0;
  transition: transform var(--transition-base);
}

header nav > a[href="/"]::before {
  content: "";
  position: absolute;
  inset: -4px -10px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  opacity: 0;
  transform: scale(0.9);
  transition: opacity var(--transition-base), transform var(--transition-base);
  z-index: -1;
}

header nav > a[href="/"]:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

header nav > a[href="/"]:hover::before {
  opacity: 1;
  transform: scale(1);
}

header nav ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  margin-left: auto;
}

header nav ul li a {
  display: inline-block;
  padding: 0.45rem 0.85rem;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-base), background var(--transition-base), transform var(--transition-base);
}

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

header nav ul li a:hover,
header nav ul li a:focus-visible {
  color: var(--color-accent);
  background: var(--color-accent-soft);
  text-decoration: none;
  transform: translateY(-1px);
}

header nav ul li a:hover::after,
header nav ul li a:focus-visible::after {
  width: 60%;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

main > section {
  position: relative;
  padding: var(--space-lg);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: 0 4px 24px var(--color-shadow);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow), border-color var(--transition-base);
  animation: fadeUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-timeline: view();
  animation-range: entry 0% entry 40%;
}

main > section:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px var(--color-shadow-lg);
  border-color: var(--color-border-strong);
}

#intro {
  background: var(--gradient-hero);
  color: #F9FAFB;
  border: none;
  overflow: hidden;
  padding: var(--space-xl) var(--space-lg);
}

#intro::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -20%;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.35) 0%, transparent 70%);
  pointer-events: none;
  animation: floatOrb 12s ease-in-out infinite;
}

#intro::after {
  content: "";
  position: absolute;
  bottom: -50%;
  left: -10%;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.12) 0%, transparent 70%);
  pointer-events: none;
  animation: floatOrb 15s ease-in-out infinite reverse;
}

#intro h1 {
  background: none;
  -webkit-text-fill-color: #FFFFFF;
  color: #FFFFFF;
  position: relative;
  z-index: 1;
}

#intro h2 {
  color: #FFFFFF;
  position: relative;
  z-index: 1;
}

#intro h2::after {
  background: linear-gradient(90deg, #FB923C, #FDE68A);
}

#intro h3,
#intro h4 {
  color: #FDE68A;
  position: relative;
  z-index: 1;
}

#intro p {
  color: rgba(249, 250, 251, 0.88);
  position: relative;
  z-index: 1;
}

#intro strong {
  color: #FFFFFF;
}

#products ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-md);
  margin: var(--space-md) 0;
}

#products ul li {
  padding: var(--space-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  box-shadow: 0 2px 10px var(--color-shadow);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

#products ul li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

#products ul li:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--color-shadow-lg);
  border-color: var(--color-accent);
}

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

#cases blockquote {
  border-left-color: var(--color-accent);
  background: var(--glass-bg);
}

#news {
  display: block;
}

#news article {
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 2px 12px var(--color-shadow);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

#news article::after {
  content: "→";
  position: absolute;
  right: var(--space-md);
  bottom: var(--space-md);
  font-size: 1.2rem;
  color: var(--color-accent);
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

#news article:hover {
  transform: translateX(6px);
  box-shadow: 0 10px 30px var(--color-shadow-lg);
  border-color: var(--color-accent);
}

#news article:hover::after {
  opacity: 1;
  transform: translateX(0);
}

#news article h3 {
  margin-bottom: var(--space-xs);
  transition: color var(--transition-base);
}

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

#news article p:first-of-type {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

#news article a {
  display: inline-block;
  margin-top: var(--space-xs);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  transition: background var(--transition-base), transform var(--transition-base);
}

#news article a:hover {
  background: var(--color-accent);
  color: #FFFFFF;
  text-decoration: none;
  transform: translateX(2px);
}

#howto ol {
  counter-reset: step-counter;
  display: grid;
  gap: var(--space-sm);
  margin: var(--space-md) 0;
}

#howto ol li {
  counter-increment: step-counter;
  position: relative;
  padding: var(--space-md) var(--space-md) var(--space-md) 4rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  box-shadow: 0 2px 10px var(--color-shadow);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#howto ol li::before {
  content: counter(step-counter);
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  color: #FFFFFF;
  background: var(--gradient-accent);
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(249, 115, 22, 0.35);
  transition: transform var(--transition-base);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: 0 10px 28px var(--color-shadow-lg);
  border-color: var(--color-accent);
}

#howto ol li:hover::before {
  transform: translateY(-50%) scale(1.12) rotate(-6deg);
}

#faq {
  display: block;
}

#faq h3 {
  position: relative;
  padding: var(--space-md) var(--space-md) var(--space-md) 2.6rem;
  margin-top: var(--space-sm);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  cursor: pointer;
  transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base);
  font-size: 1.05rem;
}

#faq h3::before {
  content: "?";
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 800;
  color: #FFFFFF;
  background: var(--gradient-accent);
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(249, 115, 22, 0.3);
}

#faq h3:hover {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

#faq h3 + p {
  padding: var(--space-md);
  margin: 0 0 var(--space-sm);
  background: var(--glass-bg);
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

#faq h3 + p:hover {
  box-shadow: 0 8px 24px var(--color-shadow);
}

#contact ul,
#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-sm);
  margin: var(--space-md) 0;
}

#contact ul li {
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.94rem;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

#contact ul li:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent);
  box-shadow: 0 8px 20px var(--color-shadow);
}

#sitemap ul li a,
#links ul li a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
  text-decoration: none;
  transition: transform var(--transition-base), background var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  position: relative;
  overflow: hidden;
}

#sitemap ul li a::before,
#links ul li a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 3px;
  background: var(--gradient-accent);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform var(--transition-base);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  transform: translateX(5px);
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 6px 18px var(--color-shadow);
  text-decoration: none;
}

#sitemap ul li a:hover::before,
#links ul li a:hover::before {
  transform: scaleY(1);
}

footer {
  background: var(--color-primary);
  color: #D1D5DB;
  padding: var(--space-xl) var(--space-md) var(--space-lg);
  margin-top: var(--space-xl);
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-accent);
}

footer > section {
  max-width: var(--max-width);
  margin: 0 auto var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: border-color var(--transition-base);
}

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

footer h2 {
  color: #F9FAFB;
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
  padding-bottom: 0;
}

footer h2::after {
  display: none;
}

footer p {
  color: #9CA3AF;
  font-size: 0.92rem;
  margin-bottom: var(--space-sm);
}

footer > p:last-child {
  max-width: var(--max-width);
  margin: var(--space-lg) auto 0;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
  font-size: 0.85rem;
  color: #6B7280;
  letter-spacing: 0.02em;
}

footer a {
  color: #FB923C;
}

footer a:hover {
  color: #FDBA74;
}

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

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

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

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

::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: 10px;
  border: 2px solid var(--color-bg);
  transition: background var(--transition-base);
}

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

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@media (max-width: 900px) {
  header nav {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  header nav ul {
    margin-left: 0;
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: var(--space-xs);
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  header nav ul::-webkit-scrollbar {
    display: none;
  }

  header nav ul li a {
    white-space: nowrap;
    font-size: 0.88rem;
    padding: 0.4rem 0.7rem;
  }

  main {
    padding: var(--space-md) var(--space-sm) var(--space-xl);
    gap: var(--space-lg);
  }

  main > section {
    padding: var(--space-md);
    border-radius: var(--radius-md);
  }

  #intro {
    padding: var(--space-lg) var(--space-md);
  }

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

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

  #howto ol li {
    padding-left: 3.4rem;
  }

  blockquote {
    padding: var(--space-md);
  }
}

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

  header nav > a[href="/"] {
    font-size: 1.15rem;
  }

  main > section {
    padding: var(--space-sm) var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
  }

  #intro {
    padding: var(--space-lg) var(--space-sm);
  }

  #faq h3 {
    padding-left: 2.4rem;
    font-size: 0.98rem;
  }

  #faq h3::before {
    left: var(--space-sm);
    width: 20px;
    height: 20px;
    font-size: 0.7rem;
  }

  #faq h3 + p {
    padding: var(--space-sm);
  }

  footer {
    padding: var(--space-lg) var(--space-sm) var(--space-md);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}