:root {
  --spade-deep: #1a1a2e;
  --spade-deeper: #12121f;
  --spade-purple: #2d2b55;
  --spade-violet: #6c5ce7;
  --spade-violet-soft: #8b7cf0;
  --spade-orange: #ff7a45;
  --spade-orange-soft: #ffa06b;
  --spade-amber: #ffb347;
  --spade-text: #2b2b3a;
  --spade-text-soft: #5a5a72;
  --spade-text-mute: #8a8aa3;
  --spade-bg: #f6f5fb;
  --spade-bg-alt: #ffffff;
  --spade-card: rgba(255, 255, 255, 0.72);
  --spade-card-solid: #ffffff;
  --spade-border: rgba(108, 92, 231, 0.14);
  --spade-border-strong: rgba(108, 92, 231, 0.28);
  --spade-shadow: 0 8px 30px rgba(45, 43, 85, 0.08);
  --spade-shadow-hover: 0 18px 46px rgba(45, 43, 85, 0.16);
  --spade-radius: 20px;
  --spade-radius-sm: 14px;
  --spade-radius-lg: 28px;
  --spade-max: 1180px;
  --spade-blur: saturate(160%) blur(18px);
  --spade-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --spade-grad: linear-gradient(135deg, #6c5ce7 0%, #8b7cf0 42%, #ff7a45 100%);
  --spade-grad-soft: linear-gradient(135deg, rgba(108, 92, 231, 0.12), rgba(255, 122, 69, 0.12));
}

@media (prefers-color-scheme: dark) {
  :root {
    --spade-text: #ecebf5;
    --spade-text-soft: #b6b4cc;
    --spade-text-mute: #8f8da8;
    --spade-bg: #0f0f1a;
    --spade-bg-alt: #171728;
    --spade-card: rgba(35, 34, 56, 0.62);
    --spade-card-solid: #1d1c30;
    --spade-border: rgba(139, 124, 240, 0.18);
    --spade-border-strong: rgba(139, 124, 240, 0.34);
    --spade-shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
    --spade-shadow-hover: 0 18px 46px rgba(0, 0, 0, 0.6);
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.78;
  color: var(--spade-text);
  background-color: var(--spade-bg);
  background-image:
    radial-gradient(900px 520px at 88% -8%, rgba(108, 92, 231, 0.16), transparent 62%),
    radial-gradient(760px 480px at -10% 12%, rgba(255, 122, 69, 0.14), transparent 60%),
    radial-gradient(680px 420px at 50% 108%, rgba(139, 124, 240, 0.12), transparent 62%);
  background-attachment: fixed;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: rgba(108, 92, 231, 0.28);
  color: var(--spade-text);
}

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

a {
  color: var(--spade-violet);
  text-decoration: none;
  transition: color 0.25s var(--spade-ease), opacity 0.25s var(--spade-ease);
}

a:hover,
a:focus-visible {
  color: var(--spade-orange);
}

a:focus-visible,
summary:focus-visible,
button:focus-visible {
  outline: 2px solid var(--spade-orange);
  outline-offset: 3px;
  border-radius: 6px;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.6em;
  line-height: 1.32;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--spade-text);
}

h1 {
  font-size: clamp(1.7rem, 1.2rem + 2.4vw, 2.9rem);
  letter-spacing: -0.01em;
}

h2 {
  font-size: clamp(1.35rem, 1.1rem + 1.1vw, 2rem);
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.16em;
  bottom: 0.16em;
  width: 6px;
  border-radius: 6px;
  background: var(--spade-grad);
  box-shadow: 0 0 16px rgba(108, 92, 231, 0.45);
}

h3 {
  font-size: clamp(1.08rem, 1rem + 0.4vw, 1.28rem);
  color: var(--spade-text);
}

h3::after {
  content: "";
  display: block;
  width: 34px;
  height: 3px;
  margin-top: 10px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--spade-violet), var(--spade-orange));
  opacity: 0.75;
}

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

ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.25em;
  color: var(--spade-text-soft);
}

li {
  margin-bottom: 0.4em;
}

strong {
  color: var(--spade-text);
}

header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 10px clamp(12px, 3vw, 32px);
  background: var(--spade-card);
  -webkit-backdrop-filter: var(--spade-blur);
  backdrop-filter: var(--spade-blur);
  border-bottom: 1px solid var(--spade-border);
  box-shadow: 0 6px 24px rgba(26, 26, 46, 0.06);
}

header nav {
  max-width: var(--spade-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 18px;
}

header nav > a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.12rem;
  letter-spacing: 0.02em;
  color: var(--spade-text);
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--spade-grad-soft);
  border: 1px solid var(--spade-border);
  transition: transform 0.3s var(--spade-ease), box-shadow 0.3s var(--spade-ease);
}

header nav > a::before {
  content: "♠";
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 9px;
  font-size: 0.95rem;
  color: #fff;
  background: var(--spade-grad);
  box-shadow: 0 4px 14px rgba(108, 92, 231, 0.4);
}

header nav > a:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(108, 92, 231, 0.22);
}

header nav ul {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  -webkit-overflow-scrolling: touch;
}

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

header nav ul li {
  margin: 0;
  flex: 0 0 auto;
}

header nav ul li a {
  display: inline-block;
  padding: 7px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--spade-text-soft);
  border-radius: 999px;
  white-space: nowrap;
  transition: color 0.25s var(--spade-ease), background 0.25s var(--spade-ease),
    transform 0.25s var(--spade-ease);
}

header nav ul li a:hover {
  color: var(--spade-text);
  background: rgba(108, 92, 231, 0.12);
  transform: translateY(-1px);
}

main {
  display: block;
  max-width: var(--spade-max);
  margin: 0 auto;
  padding: clamp(18px, 3vw, 40px) clamp(14px, 3vw, 32px) 60px;
}

main > section {
  position: relative;
  margin-bottom: clamp(20px, 3vw, 34px);
  padding: clamp(20px, 3.2vw, 40px);
  border-radius: var(--spade-radius-lg);
  background: var(--spade-card);
  -webkit-backdrop-filter: var(--spade-blur);
  backdrop-filter: var(--spade-blur);
  border: 1px solid var(--spade-border);
  box-shadow: var(--spade-shadow);
  transition: transform 0.45s var(--spade-ease), box-shadow 0.45s var(--spade-ease),
    border-color 0.45s var(--spade-ease);
  animation: spade-rise 0.7s var(--spade-ease) both;
}

main > section:hover {
  box-shadow: var(--spade-shadow-hover);
  border-color: var(--spade-border-strong);
  transform: translateY(-3px);
}

@keyframes spade-rise {
  from {
    opacity: 0;
    transform: translateY(26px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#hero {
  padding: clamp(28px, 4.4vw, 64px) clamp(22px, 3.6vw, 56px);
  border-radius: var(--spade-radius-lg);
  background:
    linear-gradient(135deg, rgba(26, 26, 46, 0.92) 0%, rgba(45, 43, 85, 0.9) 46%, rgba(108, 92, 231, 0.86) 100%),
    radial-gradient(620px 320px at 88% 0%, rgba(255, 122, 69, 0.55), transparent 65%);
  color: #f4f3fb;
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: 0 24px 60px rgba(26, 26, 46, 0.35);
  overflow: hidden;
  isolation: isolate;
}

#hero::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto auto;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 179, 71, 0.42), transparent 68%);
  filter: blur(10px);
  z-index: -1;
  animation: spade-float 12s ease-in-out infinite;
}

#hero::after {
  content: "♠";
  position: absolute;
  right: clamp(8px, 3vw, 46px);
  bottom: -46px;
  font-size: clamp(140px, 22vw, 280px);
  line-height: 1;
  color: rgba(255, 255, 255, 0.06);
  z-index: -1;
  pointer-events: none;
}

@keyframes spade-float {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(-26px, 22px, 0) scale(1.08);
  }
}

#hero h1 {
  color: #ffffff;
  text-shadow: 0 4px 26px rgba(0, 0, 0, 0.3);
  margin-bottom: 0.5em;
}

#hero h1::after {
  content: "";
  display: block;
  width: 96px;
  height: 5px;
  margin-top: 18px;
  border-radius: 5px;
  background: linear-gradient(90deg, var(--spade-amber), var(--spade-orange));
  box-shadow: 0 0 22px rgba(255, 179, 71, 0.6);
}

#hero p {
  color: rgba(244, 243, 251, 0.86);
  font-size: clamp(0.95rem, 0.9rem + 0.25vw, 1.06rem);
  max-width: 78ch;
}

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

#brand,
#about,
#history,
#culture,
#products,
#advantages,
#solutions,
#applications,
#cases,
#reviews,
#news,
#articles,
#knowledge,
#faq,
#howto,
#contact,
#sitemap,
#links {
  scroll-margin-top: 96px;
}

#articles article {
  position: relative;
  margin-bottom: 18px;
  padding: 20px 22px;
  border-radius: var(--spade-radius);
  background: var(--spade-card-solid);
  border: 1px solid var(--spade-border);
  box-shadow: 0 4px 18px rgba(45, 43, 85, 0.06);
  transition: transform 0.4s var(--spade-ease), box-shadow 0.4s var(--spade-ease),
    border-color 0.4s var(--spade-ease);
}

#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 4px;
  border-radius: 4px;
  background: var(--spade-grad);
  opacity: 0.55;
  transition: opacity 0.35s var(--spade-ease), top 0.35s var(--spade-ease),
    bottom 0.35s var(--spade-ease);
}

#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--spade-shadow-hover);
  border-color: var(--spade-border-strong);
}

#articles article:hover::before {
  opacity: 1;
  top: 12px;
  bottom: 12px;
}

#articles article h3 {
  margin-bottom: 0.35em;
}

#articles article h3::after {
  display: none;
}

#articles article p {
  margin-bottom: 0.6em;
}

#articles article p:first-of-type {
  font-size: 0.86rem;
  color: var(--spade-text-mute);
  letter-spacing: 0.02em;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
  padding: 7px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  border-radius: 999px;
  background: var(--spade-grad);
  box-shadow: 0 6px 18px rgba(108, 92, 231, 0.28);
  transition: transform 0.3s var(--spade-ease), box-shadow 0.3s var(--spade-ease),
    filter 0.3s var(--spade-ease);
}

#articles article a::after {
  content: "→";
  transition: transform 0.3s var(--spade-ease);
}

#articles article a:hover {
  color: #fff;
  transform: translateY(-2px);
  filter: brightness(1.06);
  box-shadow: 0 10px 26px rgba(255, 122, 69, 0.4);
}

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

#cases h3,
#reviews h3,
#news h3,
#knowledge h3,
#solutions h3,
#applications h3,
#advantages h3,
#products h3,
#culture h3,
#history h3,
#about h3,
#brand h3 {
  margin-top: 1.4em;
}

#reviews p {
  position: relative;
  padding: 16px 18px 16px 46px;
  margin-bottom: 14px;
  border-radius: var(--spade-radius-sm);
  background: var(--spade-card-solid);
  border: 1px solid var(--spade-border);
  font-style: normal;
  transition: transform 0.35s var(--spade-ease), box-shadow 0.35s var(--spade-ease);
}

#reviews p::before {
  content: "“";
  position: absolute;
  left: 14px;
  top: 4px;
  font-size: 2.2rem;
  line-height: 1;
  font-weight: 700;
  color: var(--spade-orange);
  opacity: 0.7;
}

#reviews p:hover {
  transform: translateX(4px);
  box-shadow: 0 10px 28px rgba(108, 92, 231, 0.14);
}

#news h3 + p {
  font-size: 0.84rem;
  color: var(--spade-text-mute);
  margin-bottom: 0.4em;
  letter-spacing: 0.02em;
}

#faq details {
  margin-bottom: 12px;
  border-radius: var(--spade-radius-sm);
  background: var(--spade-card-solid);
  border: 1px solid var(--spade-border);
  box-shadow: 0 4px 16px rgba(45, 43, 85, 0.05);
  overflow: hidden;
  transition: border-color 0.35s var(--spade-ease), box-shadow 0.35s var(--spade-ease),
    transform 0.35s var(--spade-ease);
}

#faq details:hover {
  border-color: var(--spade-border-strong);
  box-shadow: 0 10px 28px rgba(108, 92, 231, 0.14);
  transform: translateY(-2px);
}

#faq details[open] {
  border-color: var(--spade-border-strong);
  box-shadow: 0 12px 32px rgba(108, 92, 231, 0.16);
}

#faq summary {
  position: relative;
  padding: 15px 48px 15px 18px;
  font-weight: 600;
  color: var(--spade-text);
  cursor: pointer;
  list-style: none;
  transition: color 0.25s var(--spade-ease), background 0.25s var(--spade-ease);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
  border-radius: 50%;
  background: var(--spade-grad);
  box-shadow: 0 4px 12px rgba(108, 92, 231, 0.3);
  transition: transform 0.35s var(--spade-ease), background 0.35s var(--spade-ease);
}

#faq details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
  background: linear-gradient(135deg, var(--spade-orange), var(--spade-amber));
}

#faq details p {
  margin: 0;
  padding: 0 18px 16px;
  font-size: 0.95rem;
  animation: spade-fade 0.4s var(--spade-ease) both;
}

@keyframes spade-fade {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#contact ul,
#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  margin: 0 0 1em;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

#contact ul li {
  padding: 12px 16px;
  border-radius: var(--spade-radius-sm);
  background: var(--spade-card-solid);
  border: 1px solid var(--spade-border);
  font-size: 0.94rem;
  color: var(--spade-text-soft);
  transition: transform 0.3s var(--spade-ease), box-shadow 0.3s var(--spade-ease),
    border-color 0.3s var(--spade-ease);
}

#contact ul li:hover {
  transform: translateY(-3px);
  border-color: var(--spade-border-strong);
  box-shadow: 0 10px 24px rgba(108, 92, 231, 0.14);
}

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

#sitemap ul li a,
#links ul li a {
  display: block;
  padding: 10px 16px;
  border-radius: var(--spade-radius-sm);
  background: var(--spade-card-solid);
  border: 1px solid var(--spade-border);
  font-size: 0.92rem;
  color: var(--spade-text-soft);
  transition: transform 0.3s var(--spade-ease), color 0.3s var(--spade-ease),
    border-color 0.3s var(--spade-ease), box-shadow 0.3s var(--spade-ease);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  transform: translateY(-3px);
  color: var(--spade-text);
  border-color: var(--spade-border-strong);
  box-shadow: 0 10px 24px rgba(108, 92, 231, 0.16);
}

footer {
  max-width: var(--spade-max);
  margin: 0 auto;
  padding: 0 clamp(14px, 3vw, 32px) 50px;
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

footer section {
  padding: clamp(20px, 2.6vw, 30px);
  border-radius: var(--spade-radius);
  background: var(--spade-card);
  -webkit-backdrop-filter: var(--spade-blur);
  backdrop-filter: var(--spade-blur);
  border: 1px solid var(--spade-border);
  box-shadow: var(--spade-shadow);
  transition: transform 0.4s var(--spade-ease), box-shadow 0.4s var(--spade-ease);
}

footer section:hover {
  transform: translateY(-3px);
  box-shadow: var(--spade-shadow-hover);
}

footer h2 {
  font-size: 1.06rem;
  padding-left: 14px;
}

footer h2::before {
  width: 5px;
}

footer p {
  font-size: 0.9rem;
  margin-bottom: 0.6em;
}

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

#footer-info-title + p {
  font-weight: 600;
  color: var(--spade-text);
}

footer section:first-child p:last-child {
  margin-top: 10px;
  padding-top: 12px;
  border-top: 1px dashed var(--spade-border-strong);
  color: var(--spade-text-mute);
  font-size: 0.84rem;
}

@media (max-width: 900px) {
  header nav {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  header nav > a {
    align-self: flex-start;
  }

  header nav ul {
    padding-bottom: 4px;
  }

  html {
    scroll-padding-top: 130px;
  }

  #brand,
  #about,
  #history,
  #culture,
  #products,
  #advantages,
  #solutions,
  #applications,
  #cases,
  #reviews,
  #news,
  #articles,
  #knowledge,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links {
    scroll-margin-top: 130px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
    line-height: 1.75;
  }

  main > section {
    border-radius: var(--spade-radius);
    padding: 18px 16px;
  }

  #hero {
    padding: 26px 18px 30px;
  }

  #hero::after {
    font-size: 150px;
    bottom: -30px;
  }

  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 5px;
  }

  #articles article {
    padding: 16px 16px 18px 18px;
  }

  #reviews p {
    padding: 14px 14px 14px 40px;
  }

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

  footer {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media print {
  header,
  footer,
  #sitemap,
  #links {
    display: none;
  }

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

  main > section {
    box-shadow: none;
    border: 1px solid #ddd;
    background: #fff;
    break-inside: avoid;
  }
}