:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16162a;
  --bg-card: rgba(26, 26, 46, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.05);
  --bg-glass-hover: rgba(255, 255, 255, 0.1);
  --text-primary: #eaeaf0;
  --text-secondary: #a0a0b8;
  --text-muted: #6c6c85;
  --accent: #e94560;
  --accent-hover: #ff6b81;
  --accent-glow: rgba(233, 69, 96, 0.4);
  --gradient-1: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  --gradient-2: linear-gradient(135deg, #e94560 0%, #533483 100%);
  --gradient-hero: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 30%, #16213e 60%, #1a1a2e 100%);
  --gradient-card: linear-gradient(145deg, rgba(26, 26, 46, 0.9), rgba(15, 15, 26, 0.8));
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(233, 69, 96, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(233, 69, 96, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  --max-width: 1200px;
  --header-height: 68px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f5f5f8;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f0f0f5;
    --bg-card: rgba(255, 255, 255, 0.75);
    --bg-glass: rgba(255, 255, 255, 0.6);
    --bg-glass-hover: rgba(255, 255, 255, 0.8);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8888a0;
    --border-color: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(233, 69, 96, 0.5);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 30px rgba(233, 69, 96, 0.1);
    --gradient-hero: linear-gradient(135deg, #f5f5f8 0%, #e8e8f0 30%, #dddde8 60%, #e8e8f0 100%);
    --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(245, 245, 248, 0.85));
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

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

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
}

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

#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(15, 15, 26, 0.72);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

@media (prefers-color-scheme: light) {
  #site-header {
    background: rgba(255, 255, 255, 0.72);
  }
}

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.brand:hover {
  opacity: 0.85;
}

.brand svg {
  border-radius: var(--radius-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.brand:hover svg {
  transform: rotate(-6deg) scale(1.08);
  box-shadow: 0 0 20px var(--accent-glow);
}

#main-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

#main-nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

#main-nav a {
  display: block;
  padding: 6px 12px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  position: relative;
}

#main-nav a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transition: transform var(--transition-base);
}

#main-nav a:hover {
  color: var(--text-primary);
  background: var(--bg-glass-hover);
  transform: translateY(-1px);
}

#main-nav a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

#menu-toggle {
  display: none;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-family: var(--font-family);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

#menu-toggle:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
}

main {
  padding-top: var(--header-height);
}

section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px;
}

#hero {
  position: relative;
  max-width: 100%;
  padding: 100px 24px 80px;
  background: var(--gradient-hero);
  overflow: hidden;
  text-align: center;
}

#hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.12) 0%, transparent 70%);
  animation: heroGlow 8s ease-in-out infinite alternate;
  pointer-events: none;
}

#hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  right: -10%;
  width: 50%;
  height: 150%;
  background: radial-gradient(circle, rgba(83, 52, 131, 0.15) 0%, transparent 70%);
  animation: heroGlow 10s ease-in-out infinite alternate-reverse;
  pointer-events: none;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) scale(1); opacity: 0.6; }
  100% { transform: translate(30px, -20px) scale(1.15); opacity: 1; }
}

#hero h1 {
  position: relative;
  z-index: 1;
  font-size: clamp(1.6rem, 4.5vw, 2.8rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 24px;
  background: var(--gradient-2);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeInUp 0.8s ease-out both;
}

#hero p {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto 16px;
  color: var(--text-secondary);
  font-size: clamp(0.9rem, 1.8vw, 1.05rem);
  line-height: 1.8;
  animation: fadeInUp 0.8s ease-out 0.15s both;
}

#hero p:nth-child(3) {
  animation-delay: 0.3s;
}

#hero p:nth-child(4) {
  animation-delay: 0.45s;
  font-size: 0.85rem;
  color: var(--text-muted);
}

#hero a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

#hero a:hover {
  color: var(--accent-hover);
  border-bottom-color: var(--accent-hover);
}

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

h2 {
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  font-weight: 700;
  margin-bottom: 24px;
  position: relative;
  padding-left: 18px;
  line-height: 1.4;
  color: var(--text-primary);
}

h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.2em;
  bottom: 0.2em;
  width: 4px;
  border-radius: 2px;
  background: var(--gradient-2);
}

h3 {
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--text-primary);
  line-height: 1.5;
}

h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 20px 0 8px;
  color: var(--text-secondary);
}

p {
  margin-bottom: 14px;
  color: var(--text-secondary);
  line-height: 1.85;
}

time {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

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

a:hover {
  color: var(--accent-hover);
}

ol, ul {
  padding-left: 24px;
  margin-bottom: 16px;
}

li {
  margin-bottom: 8px;
  color: var(--text-secondary);
  line-height: 1.8;
}

article {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 20px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

article::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-2);
  opacity: 0;
  transition: opacity var(--transition-base);
}

article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--border-hover);
}

article:hover::before {
  opacity: 1;
}

article h3 {
  margin-top: 0;
}

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

#intro, #about, #history, #culture, #products, #solutions, #cases, #news, #articles, #faq, #howto, #contact, #sitemap, #links, #legal, #author-info {
  animation: fadeInUp 0.6s ease-out both;
  animation-timeline: view();
  animation-range: entry 0% entry 30%;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#intro h3:first-of-type {
  margin-top: 0;
}

#articles > p {
  margin-bottom: 24px;
  font-size: 0.95rem;
}

#articles article {
  padding: 20px 24px;
}

#articles article h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

#articles article p {
  font-size: 0.9rem;
  margin-bottom: 8px;
}

#articles article a {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

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

#articles section[id^="article-"] {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color var(--transition-base);
}

#articles section[id^="article-"]:hover {
  border-color: var(--border-hover);
}

#articles section[id^="article-"] h4 {
  color: var(--text-primary);
  font-size: 1rem;
  margin-bottom: 12px;
}

#articles section[id^="article-"] p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

#faq h3 {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin: 0 0 -1px;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
  position: relative;
  font-size: 0.95rem;
}

#faq h3::after {
  content: '+';
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform var(--transition-base), color var(--transition-base);
}

#faq h3:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
}

#faq h3:hover::after {
  color: var(--accent);
}

#faq p {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-top: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  padding: 14px 20px;
  margin: 0 0 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

#faq h3:first-of-type {
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

#faq h3:last-of-type {
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

#faq h3:last-of-type + p {
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

#howto ol {
  counter-reset: step;
  list-style: none;
  padding-left: 0;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding-left: 48px;
  margin-bottom: 16px;
  padding-top: 8px;
  padding-bottom: 8px;
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 8px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--gradient-2);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px var(--accent-glow);
}

#contact p {
  padding: 8px 0;
  border-bottom: 1px solid var(--border-color);
}

#contact p:last-of-type {
  border-bottom: none;
}

#sitemap ul {
  list-style: none;
  padding-left: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
}

#sitemap li {
  margin-bottom: 0;
}

#sitemap a {
  display: block;
  padding: 10px 16px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#sitemap a:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

#links ul {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

#links li {
  margin-bottom: 0;
}

#links a {
  display: inline-block;
  padding: 8px 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.85rem;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#links a:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

#legal h2 {
  margin-top: 32px;
}

#legal h2:first-of-type {
  margin-top: 0;
}

#author-info p {
  padding: 6px 0;
  font-size: 0.9rem;
}

footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 24px;
  text-align: center;
}

footer p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

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

footer a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

footer a:hover {
  color: var(--accent);
}

#back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 999;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--text-primary);
  font-size: 0.7rem;
  font-family: var(--font-family);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-md);
  padding: 0;
  line-height: 1.2;
  text-align: center;
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#back-to-top:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 0 30px var(--accent-glow);
  transform: translateY(-4px) scale(1.05);
}

#back-to-top:active {
  transform: translateY(-2px) scale(0.98);
}

@media (max-width: 1024px) {
  #main-nav ul {
    gap: 2px;
  }

  #main-nav a {
    padding: 5px 8px;
    font-size: 0.78rem;
  }
}

@media (max-width: 820px) {
  :root {
    --header-height: 60px;
  }

  .header-inner {
    padding: 0 16px;
  }

  #menu-toggle {
    display: block;
  }

  #main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(15, 15, 26, 0.96);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 16px;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-base);
    justify-content: flex-start;
  }

  @media (prefers-color-scheme: light) {
    #main-nav {
      background: rgba(255, 255, 255, 0.96);
    }
  }

  #main-nav.open {
    max-height: 70vh;
    overflow-y: auto;
    padding: 12px 16px 20px;
  }

  #main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    width: 100%;
  }

  #main-nav a {
    padding: 12px 16px;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
  }

  #main-nav a::after {
    display: none;
  }

  #hero {
    padding: 72px 20px 56px;
  }

  section {
    padding: 36px 16px;
  }

  article {
    padding: 18px 16px;
  }

  #articles article {
    padding: 16px;
  }

  #articles section[id^="article-"] {
    padding: 18px 16px;
  }

  #sitemap ul {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 0.65rem;
  }
}

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

  #hero {
    padding: 60px 16px 44px;
  }

  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 3px;
  }

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

  #sitemap a {
    padding: 8px 12px;
    font-size: 0.82rem;
  }

  #links ul {
    flex-direction: column;
  }

  #links a {
    text-align: center;
  }

  #howto ol li {
    padding-left: 40px;
  }

  #howto ol li::before {
    width: 26px;
    height: 26px;
    font-size: 0.75rem;
  }

  #faq h3 {
    padding: 12px 16px;
    font-size: 0.88rem;
  }

  #faq p {
    padding: 12px 16px;
    font-size: 0.85rem;
  }
}

@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;
  }
}

@supports not (backdrop-filter: blur(10px)) {
  #site-header {
    background: rgba(15, 15, 26, 0.95);
  }

  @media (prefers-color-scheme: light) {
    #site-header {
      background: rgba(255, 255, 255, 0.95);
    }
  }

  article,
  #articles section[id^="article-"],
  #faq h3,
  #faq p,
  #sitemap a,
  #links a,
  #back-to-top {
    background: var(--bg-secondary);
  }
}