:root {
  --orange-primary: #FF7A1A;
  --orange-secondary: #FF9A4D;
  --orange-deep: #E85D04;
  --orange-light: #FFF3E6;
  --gradient-hero: linear-gradient(135deg, #FF7A1A 0%, #FF9A4D 45%, #FFB870 100%);
  --gradient-accent: linear-gradient(120deg, #FF7A1A, #FFB347);
  --bg-body: #FFF8F2;
  --bg-surface: #FFFFFF;
  --bg-surface-glass: rgba(255, 255, 255, 0.72);
  --bg-elevated: #FFFFFF;
  --text-primary: #2B1D14;
  --text-secondary: #5C4A3D;
  --text-muted: #8A7566;
  --border-soft: rgba(255, 122, 26, 0.16);
  --border-glass: rgba(255, 255, 255, 0.55);
  --shadow-sm: 0 2px 8px rgba(232, 93, 4, 0.08);
  --shadow-md: 0 8px 24px rgba(232, 93, 4, 0.12);
  --shadow-lg: 0 16px 48px rgba(232, 93, 4, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1180px;
  --header-h: 68px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --orange-primary: #FF8C3A;
    --orange-secondary: #FFA95C;
    --orange-deep: #FF7A1A;
    --orange-light: #2A1E15;
    --gradient-hero: linear-gradient(135deg, #3A2213 0%, #4A2A15 45%, #5C3419 100%);
    --gradient-accent: linear-gradient(120deg, #FF8C3A, #FFB870);
    --bg-body: #16110D;
    --bg-surface: #1F1812;
    --bg-surface-glass: rgba(31, 24, 18, 0.68);
    --bg-elevated: #261D16;
    --text-primary: #F5EDE6;
    --text-secondary: #C9B8AB;
    --text-muted: #9A8577;
    --border-soft: rgba(255, 140, 58, 0.22);
    --border-glass: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
  }
}

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

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

body {
  font-family: var(--font-base);
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.8;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image:
    radial-gradient(circle at 12% 8%, rgba(255, 122, 26, 0.08), transparent 42%),
    radial-gradient(circle at 88% 18%, rgba(255, 154, 77, 0.07), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(255, 179, 71, 0.06), transparent 50%);
  background-attachment: fixed;
}

@media (prefers-color-scheme: dark) {
  body {
    background-image:
      radial-gradient(circle at 12% 8%, rgba(255, 140, 58, 0.10), transparent 42%),
      radial-gradient(circle at 88% 18%, rgba(255, 169, 92, 0.07), transparent 40%),
      radial-gradient(circle at 50% 100%, rgba(255, 140, 58, 0.06), transparent 50%);
  }
}

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

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

a:hover {
  color: var(--orange-primary);
  opacity: 0.9;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--orange-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: clamp(1.75rem, 4.5vw, 2.9rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.4rem, 3.2vw, 2.1rem);
  position: relative;
  padding-left: 18px;
  margin-bottom: 1.4rem;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.15em;
  bottom: 0.15em;
  width: 6px;
  border-radius: 6px;
  background: var(--gradient-accent);
  box-shadow: 0 0 12px rgba(255, 122, 26, 0.45);
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  margin-top: 1.6rem;
  margin-bottom: 0.7rem;
  color: var(--text-primary);
}

h4 {
  font-size: 1.05rem;
  margin-top: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--orange-deep);
}

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
  text-align: justify;
  word-break: break-word;
}

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-surface-glass);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

header > div {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

header > div > a:first-child {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--orange-primary);
  white-space: nowrap;
  padding: 8px 0;
  position: relative;
  transition: transform var(--transition-fast);
}

header > div > a:first-child::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 100%;
  height: 3px;
  border-radius: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

header > div > a:first-child:hover {
  transform: translateY(-1px);
}

header > div > a:first-child:hover::after {
  transform: scaleX(1);
}

header nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

header nav ul li a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

header nav ul li a::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-sm);
  background: var(--orange-light);
  opacity: 0;
  transform: scale(0.85);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: -1;
}

header nav ul li a:hover {
  color: var(--orange-deep);
  transform: translateY(-1px);
}

header nav ul li a:hover::before {
  opacity: 1;
  transform: scale(1);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px 60px;
}

section {
  margin-bottom: 48px;
  padding: 32px;
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
  animation: fadeUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
  animation-timeline: view();
  animation-range: entry 0% entry 22%;
}

@supports not (animation-timeline: view()) {
  section {
    animation: fadeUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
  }
}

section::after {
  content: "";
  position: absolute;
  top: -60%;
  right: -20%;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 26, 0.10), transparent 70%);
  pointer-events: none;
  transition: transform var(--transition-base);
}

section:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(255, 122, 26, 0.28);
}

section:hover::after {
  transform: scale(1.15);
}

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

#hero {
  margin-top: 32px;
  padding: 0;
  border: none;
  background: var(--gradient-hero);
  color: #fff;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  position: relative;
  border-radius: var(--radius-xl);
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 20%, rgba(255, 255, 255, 0.28), transparent 45%),
    radial-gradient(circle at 15% 85%, rgba(255, 255, 255, 0.16), transparent 40%);
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.18), transparent 65%);
  animation: floatBlob 12s ease-in-out infinite;
  pointer-events: none;
}

@keyframes floatBlob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, 30px) scale(1.1); }
}

#hero > div {
  position: relative;
  z-index: 2;
  padding: 56px 40px;
}

#hero h1 {
  color: #fff;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.18);
  margin-bottom: 1.2rem;
  animation: fadeUp 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
}

#hero p {
  color: rgba(255, 255, 255, 0.94);
  max-width: 900px;
  font-size: 1.02rem;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.12);
  animation: fadeUp 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.1s both;
}

#hero p:last-child {
  margin-bottom: 0;
}

nav[aria-label="面包屑导航"] {
  margin: 24px 0 8px;
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  padding: 10px 18px;
  background: var(--bg-surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  width: fit-content;
  box-shadow: var(--shadow-sm);
}

nav[aria-label="面包屑导航"] ol li {
  display: flex;
  align-items: center;
  gap: 8px;
}

nav[aria-label="面包屑导航"] ol li:not(:last-child)::after {
  content: "›";
  color: var(--orange-primary);
  font-weight: 700;
}

nav[aria-label="面包屑导航"] ol li a {
  color: var(--text-secondary);
  font-weight: 500;
}

nav[aria-label="面包屑导航"] ol li a:hover {
  color: var(--orange-deep);
}

nav[aria-label="面包屑导航"] ol li[aria-current="page"] {
  color: var(--orange-deep);
  font-weight: 600;
}

#about,
#products,
#solutions,
#cases,
#news,
#articles,
#faq,
#howto,
#contact,
#sitemap,
#links {
  scroll-margin-top: calc(var(--header-h) + 20px);
}

#news h3,
#articles h3,
#faq h3,
#howto h3,
#howto h4 {
  padding-left: 16px;
  position: relative;
}

#news h3::before,
#articles h3::before,
#faq h3::before,
#howto h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-accent);
  box-shadow: 0 0 8px rgba(255, 122, 26, 0.5);
}

#howto h4 {
  padding-left: 0;
}

#howto h4::before {
  content: "▸ ";
  color: var(--orange-primary);
  font-weight: 700;
}

#news > h3 + p,
#articles > article > p:first-of-type {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  font-weight: 500;
}

#articles article {
  padding: 24px;
  margin-bottom: 20px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  position: relative;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  overflow: hidden;
}

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

#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(255, 122, 26, 0.3);
}

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

#articles article h3 {
  margin-top: 0;
  padding-left: 0;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

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

#articles article p:last-child {
  margin-bottom: 0;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--orange-light);
  color: var(--orange-deep);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

#articles article a:hover {
  background: var(--gradient-accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(255, 122, 26, 0.35);
}

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

#faq h3 {
  cursor: default;
  padding: 16px 20px 16px 20px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  margin-top: 14px;
  margin-bottom: 0;
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

#faq h3::before {
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
}

#faq h3 + p {
  padding: 16px 20px 20px 20px;
  margin-top: -4px;
  margin-bottom: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-soft);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  font-size: 0.95rem;
  transition: background var(--transition-fast);
}

#faq h3:hover {
  background: var(--orange-light);
  border-color: rgba(255, 122, 26, 0.35);
  box-shadow: var(--shadow-sm);
}

#faq h3:hover + p {
  border-color: rgba(255, 122, 26, 0.35);
}

#howto h3 {
  margin-top: 1.8rem;
}

#howto h4 {
  color: var(--orange-deep);
  font-weight: 700;
  margin-top: 1.4rem;
}

#howto p {
  font-size: 0.97rem;
}

#contact h3 {
  margin-top: 1.4rem;
}

#contact p {
  line-height: 2;
}

#contact p strong {
  color: var(--orange-deep);
}

#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
}

#sitemap ul li a,
#links ul li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: transform var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  overflow: hidden;
}

#sitemap ul li a::before,
#links ul li a::before {
  content: "›";
  color: var(--orange-primary);
  font-weight: 700;
  font-size: 1.1rem;
  transition: transform var(--transition-fast);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(255, 122, 26, 0.3);
}

#sitemap ul li a:hover::before,
#links ul li a:hover::before {
  color: #fff;
  transform: translateX(3px);
}

#links ul li a {
  background: var(--orange-light);
}

footer {
  background: var(--bg-surface-glass);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-top: 1px solid var(--border-soft);
  padding: 48px 20px 32px;
  margin-top: 24px;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
}

footer section {
  max-width: var(--max-width);
  margin: 0 auto 24px;
  padding: 24px 28px;
  background: var(--bg-surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  animation: none;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

footer section:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(255, 122, 26, 0.28);
}

footer section::after {
  display: none;
}

footer section h2 {
  font-size: 1.05rem;
  padding-left: 14px;
  margin-bottom: 0.8rem;
}

footer section h2::before {
  width: 4px;
}

footer section p {
  font-size: 0.9rem;
  margin-bottom: 0;
  color: var(--text-secondary);
}

footer > p {
  max-width: var(--max-width);
  margin: 0 auto 8px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

footer > p:last-child {
  margin-bottom: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.85;
}

@media (max-width: 900px) {
  header > div {
    flex-direction: column;
    align-items: flex-start;
    padding: 10px 16px;
    gap: 8px;
  }

  header nav {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 4px;
  }

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

  header nav ul {
    flex-wrap: nowrap;
    gap: 2px;
  }

  header nav ul li a {
    white-space: nowrap;
    padding: 7px 10px;
    font-size: 0.85rem;
  }

  :root {
    --header-h: auto;
  }

  #hero > div {
    padding: 40px 24px;
  }

  section {
    padding: 24px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 32px;
  }

  main {
    padding: 0 16px 40px;
  }
}

@media (max-width: 600px) {
  body {
    font-size: 15px;
    line-height: 1.75;
  }

  h2 {
    padding-left: 14px;
    margin-bottom: 1rem;
  }

  h2::before {
    width: 5px;
  }

  #hero {
    margin-top: 20px;
    border-radius: var(--radius-lg);
  }

  #hero > div {
    padding: 32px 20px;
  }

  #hero p {
    font-size: 0.95rem;
    text-align: left;
  }

  section {
    padding: 20px 16px;
    margin-bottom: 24px;
  }

  nav[aria-label="面包屑导航"] ol {
    font-size: 0.8rem;
    padding: 8px 14px;
  }

  #articles article {
    padding: 18px;
  }

  #articles article a {
    width: 100%;
    justify-content: center;
  }

  #faq h3 {
    padding: 14px 16px;
    font-size: 1rem;
  }

  #faq h3::before {
    left: 16px;
  }

  #faq h3 + p {
    padding: 14px 16px 16px;
    font-size: 0.9rem;
  }

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

  footer {
    padding: 32px 16px 24px;
  }

  footer section {
    padding: 18px 16px;
  }
}

@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 (prefers-contrast: more) {
  :root {
    --border-soft: rgba(255, 122, 26, 0.5);
    --text-secondary: #3D2C1F;
  }
}

@media print {
  header,
  footer::before,
  #hero::after,
  section::after {
    display: none;
  }

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

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