:root {
  --primary: #E63946;
  --primary-dark: #C1121F;
  --primary-light: #FF6B7A;
  --secondary: #1D3557;
  --accent: #F4A261;
  --accent-2: #2A9D8F;
  --bg: #F8F9FC;
  --bg-alt: #FFFFFF;
  --bg-card: rgba(255, 255, 255, 0.72);
  --text: #1D2433;
  --text-soft: #4A5568;
  --text-muted: #7A869A;
  --border: rgba(29, 36, 51, 0.08);
  --shadow-sm: 0 2px 8px rgba(29, 36, 51, 0.06);
  --shadow-md: 0 8px 28px rgba(29, 36, 51, 0.10);
  --shadow-lg: 0 20px 50px rgba(29, 36, 51, 0.14);
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-pill: 999px;
  --grad-banner: linear-gradient(135deg, #E63946 0%, #C1121F 40%, #1D3557 100%);
  --grad-accent: linear-gradient(135deg, #F4A261 0%, #E63946 100%);
  --grad-soft: linear-gradient(135deg, rgba(230, 57, 70, 0.10), rgba(29, 53, 87, 0.10));
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.65);
  --header-bg: rgba(255, 255, 255, 0.78);
  --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #FF5C6C;
    --primary-dark: #E63946;
    --primary-light: #FF8A96;
    --secondary: #8AB4F8;
    --accent: #F4A261;
    --accent-2: #4FD1C5;
    --bg: #0E1117;
    --bg-alt: #161B24;
    --bg-card: rgba(30, 37, 48, 0.72);
    --text: #E8ECF3;
    --text-soft: #B7C0CE;
    --text-muted: #8A94A6;
    --border: rgba(255, 255, 255, 0.09);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.55);
    --grad-banner: linear-gradient(135deg, #C1121F 0%, #6A0F1A 45%, #0E1117 100%);
    --grad-accent: linear-gradient(135deg, #F4A261 0%, #FF5C6C 100%);
    --grad-soft: linear-gradient(135deg, rgba(255, 92, 108, 0.14), rgba(138, 180, 248, 0.12));
    --glass-bg: rgba(22, 27, 36, 0.55);
    --glass-border: rgba(255, 255, 255, 0.12);
    --header-bg: rgba(14, 17, 23, 0.78);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(1200px 600px at 10% -5%, rgba(230, 57, 70, 0.10), transparent 60%),
    radial-gradient(1000px 500px at 95% 10%, rgba(29, 53, 87, 0.10), transparent 55%),
    radial-gradient(900px 500px at 50% 100%, rgba(244, 162, 97, 0.08), transparent 60%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

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

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

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

ul,
ol {
  padding-left: 1.35em;
  margin: 0 0 1em;
}

li {
  margin-bottom: 0.45em;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  margin: 0 0 0.6em;
  color: var(--text);
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(1.7rem, 4vw, 2.9rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.4rem, 2.8vw, 2.1rem);
  font-weight: 750;
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: var(--radius-pill);
  background: var(--grad-accent);
  box-shadow: 0 0 14px rgba(230, 57, 70, 0.45);
}

h3 {
  font-size: 1.18rem;
  font-weight: 700;
}

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

strong {
  color: var(--text);
  font-weight: 700;
}

time {
  color: var(--text-muted);
  font-size: 0.86rem;
  font-variant-numeric: tabular-nums;
}

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

:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ============ Header / Nav ============ */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

nav {
  max-width: 1240px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

nav > a[aria-label] {
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  white-space: nowrap;
  flex-shrink: 0;
  transition: transform var(--transition), filter var(--transition);
}

nav > a[aria-label]:hover {
  transform: translateY(-1px) scale(1.03);
  filter: drop-shadow(0 4px 12px rgba(230, 57, 70, 0.4));
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  flex: 1;
  justify-content: flex-end;
}

nav ul li {
  margin: 0;
}

nav ul a {
  display: inline-block;
  padding: 6px 11px;
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

nav ul a:hover {
  color: #fff;
  background: var(--grad-accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(230, 57, 70, 0.3);
}

/* ============ Main layout ============ */
main {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px 40px;
}

main > section {
  margin: 36px 0;
  padding: 34px clamp(20px, 4vw, 44px);
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  animation: fadeUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
  animation-timeline: view();
  animation-range: entry 0% entry 40%;
}

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

main > section:hover {
  border-color: rgba(230, 57, 70, 0.25);
  box-shadow: var(--shadow-md);
}

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

/* ============ Banner ============ */
#banner {
  position: relative;
  margin-top: 28px;
  padding: clamp(32px, 6vw, 64px) clamp(22px, 5vw, 56px);
  border-radius: var(--radius-lg);
  background: var(--grad-banner);
  background-size: 200% 200%;
  animation: fadeUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) both, gradientShift 14s ease infinite;
  color: #fff;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

#banner::before,
#banner::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
}

#banner::before {
  width: 360px;
  height: 360px;
  top: -140px;
  right: -80px;
  background: rgba(244, 162, 97, 0.55);
}

#banner::after {
  width: 300px;
  height: 300px;
  bottom: -150px;
  left: -60px;
  background: rgba(255, 255, 255, 0.22);
}

#banner h1 {
  position: relative;
  z-index: 1;
  color: #fff;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.25);
  max-width: 900px;
}

#banner > p {
  position: relative;
  z-index: 1;
  color: rgba(255, 255, 255, 0.92);
  font-size: clamp(0.95rem, 1.6vw, 1.08rem);
  max-width: 820px;
  line-height: 1.85;
}

#banner figure {
  position: relative;
  z-index: 1;
  margin: 26px 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.08);
}

#banner figure img {
  width: 100%;
  aspect-ratio: 12 / 5;
  object-fit: cover;
  transition: transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

#banner figure:hover img {
  transform: scale(1.04);
}

#banner figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 20px;
  font-size: 0.85rem;
  color: #fff;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.6), transparent);
}

/* ============ Lists in sections ============ */
#history ul,
#advantages ul,
#news ul,
#sitemap ul,
#links ul {
  list-style: none;
  padding-left: 0;
  display: grid;
  gap: 12px;
}

#history ul li,
#news ul li {
  position: relative;
  padding: 14px 18px 14px 46px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  margin: 0;
}

#history ul li::before,
#news ul li::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--grad-accent);
  box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.14);
}

#history ul li:hover,
#news ul li:hover {
  transform: translateX(6px);
  border-color: rgba(230, 57, 70, 0.3);
  box-shadow: var(--shadow-md);
}

#advantages ul {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

#advantages ul li {
  position: relative;
  padding: 18px 18px 18px 50px;
  margin: 0;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  font-weight: 500;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#advantages ul li::before {
  content: "✓";
  position: absolute;
  left: 16px;
  top: 18px;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  font-size: 0.8rem;
  font-weight: 800;
  color: #fff;
  border-radius: 50%;
  background: var(--grad-accent);
}

#advantages ul li:hover {
  transform: translateY(-4px);
  border-color: rgba(230, 57, 70, 0.3);
  box-shadow: var(--shadow-md);
}

/* ============ Products / Solutions / Cases cards ============ */
#products h3,
#solutions h3,
#cases h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 1.4em;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: var(--grad-soft);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}

#products h3::before,
#solutions h3::before,
#cases h3::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.15);
  flex-shrink: 0;
}

#products h3:hover,
#solutions h3:hover,
#cases h3:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

#products p,
#solutions p,
#cases p {
  padding-left: 4px;
}

/* ============ Reviews ============ */
#reviews blockquote {
  position: relative;
  margin: 0 0 18px;
  padding: 24px 24px 24px 64px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

#reviews blockquote::before {
  content: "“";
  position: absolute;
  left: 18px;
  top: 6px;
  font-size: 3.4rem;
  line-height: 1;
  font-family: Georgia, serif;
  color: var(--primary);
  opacity: 0.35;
}

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

#reviews blockquote:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* ============ Articles ============ */
#articles {
  display: grid;
  gap: 18px;
}

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

#articles article {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#articles article h3 {
  margin: 0;
  font-size: 1.06rem;
  color: var(--text);
  transition: color var(--transition);
}

#articles article p {
  margin: 0;
  font-size: 0.92rem;
}

#articles article a {
  align-self: flex-start;
  margin-top: 6px;
  padding: 7px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  border-radius: var(--radius-pill);
  background: var(--grad-accent);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

#articles article a:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(230, 57, 70, 0.35);
  filter: brightness(1.05);
}

#articles article:hover {
  transform: translateY(-5px);
  border-color: rgba(230, 57, 70, 0.3);
  box-shadow: var(--shadow-md);
}

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

@media (min-width: 720px) {
  #articles {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1080px) {
  #articles {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ============ FAQ ============ */
#faq details {
  margin-bottom: 12px;
  padding: 16px 20px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition), border-color var(--transition), background var(--transition);
}

#faq details[open] {
  border-color: rgba(230, 57, 70, 0.3);
  box-shadow: var(--shadow-md);
  background: var(--bg-card);
}

#faq summary {
  cursor: pointer;
  font-weight: 650;
  color: var(--text);
  list-style: none;
  position: relative;
  padding-right: 34px;
  transition: color var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  border-radius: 50%;
  background: rgba(230, 57, 70, 0.1);
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

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

#faq summary:hover {
  color: var(--primary);
}

#faq details p {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  animation: fadeUp 0.4s ease both;
}

/* ============ HowTo ============ */
#howto ol {
  counter-reset: step;
  list-style: none;
  padding-left: 0;
  display: grid;
  gap: 12px;
}

#howto ol li {
  position: relative;
  padding: 14px 18px 14px 58px;
  margin: 0;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  counter-increment: step;
  transition: transform var(--transition), box-shadow var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 800;
  color: #fff;
  border-radius: 50%;
  background: var(--grad-accent);
  box-shadow: 0 4px 12px rgba(230, 57, 70, 0.35);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

/* ============ Contact ============ */
#contact address {
  font-style: normal;
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

#contact address p {
  margin: 0;
  padding: 12px 16px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  transition: border-color var(--transition), transform var(--transition);
}

#contact address p:hover {
  border-color: rgba(230, 57, 70, 0.3);
  transform: translateX(4px);
}

#contact > p {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: var(--grad-soft);
  border: 1px solid var(--border);
  color: var(--text);
  font-weight: 500;
}

/* ============ Sitemap / Links ============ */
#sitemap ul,
#links ul {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

#sitemap ul li,
#links ul li {
  margin: 0;
}

#sitemap ul a,
#links ul a {
  display: block;
  padding: 12px 18px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  font-weight: 500;
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
}

#sitemap ul a:hover,
#links ul a:hover {
  color: #fff;
  background: var(--grad-accent);
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(230, 57, 70, 0.3);
}

/* ============ Footer ============ */
footer {
  margin-top: 48px;
  padding: 44px 20px 30px;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--grad-accent);
}

footer section {
  max-width: 1240px;
  margin: 0 auto 22px;
  padding: 18px 22px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: box-shadow var(--transition), border-color var(--transition);
}

footer section:hover {
  border-color: rgba(230, 57, 70, 0.25);
  box-shadow: var(--shadow-sm);
}

footer h2 {
  font-size: 1.05rem;
  padding-left: 14px;
  margin-bottom: 0.5em;
}

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

footer p {
  margin: 0 0 0.4em;
  font-size: 0.9rem;
  color: var(--text-muted);
}

#copyright p {
  color: var(--text-soft);
  font-weight: 500;
}

/* ============ Responsive ============ */
@media (max-width: 900px) {
  nav {
    padding: 10px 16px;
    gap: 10px;
  }

  nav ul {
    justify-content: flex-start;
    gap: 2px;
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 4px;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }

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

  nav ul a {
    white-space: nowrap;
    font-size: 0.82rem;
    padding: 6px 10px;
  }

  main {
    padding: 0 14px 30px;
  }

  main > section {
    margin: 22px 0;
    padding: 24px 18px;
    border-radius: var(--radius-md);
  }

  #banner {
    margin-top: 18px;
    border-radius: var(--radius-md);
  }

  #banner figure img {
    aspect-ratio: 16 / 9;
  }

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

  footer {
    padding: 32px 14px 24px;
  }

  footer section {
    padding: 16px;
  }
}

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

  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 4px;
  }

  nav > a[aria-label] {
    font-size: 1.12rem;
  }

  #banner {
    padding: 26px 18px;
  }

  #reviews blockquote {
    padding: 20px 18px 20px 50px;
  }

  #reviews blockquote::before {
    left: 12px;
    font-size: 2.6rem;
  }

  #history ul li,
  #news ul li {
    padding-left: 40px;
  }

  #howto ol li {
    padding-left: 52px;
  }
}

/* ============ Motion & Accessibility ============ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============ Print ============ */
@media print {
  header,
  footer::before,
  #banner::before,
  #banner::after {
    display: none;
  }

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

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

  a {
    color: #000;
    text-decoration: underline;
  }
}