:root {
  --brown-900: #3d2415;
  --brown-800: #5a3520;
  --brown-700: #7a4a2b;
  --brown-600: #9c6b3f;
  --brown-500: #b58455;
  --brown-300: #d9b896;
  --brown-100: #f5e6d3;
  --brown-50: #faf3ea;
  --ink: #2b1d12;
  --ink-soft: #6b5748;
  --paper: #fdfaf5;
  --card: rgba(255, 255, 255, 0.72);
  --card-border: rgba(122, 74, 43, 0.14);
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.65);
  --shadow-sm: 0 2px 8px rgba(61, 36, 21, 0.06);
  --shadow-md: 0 8px 28px rgba(61, 36, 21, 0.1);
  --shadow-lg: 0 18px 48px rgba(61, 36, 21, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --accent-gradient: linear-gradient(135deg, #7a4a2b 0%, #b58455 48%, #d9b896 100%);
  --banner-gradient: linear-gradient(135deg, #3d2415 0%, #7a4a2b 42%, #b58455 78%, #e2c7a6 100%);
  --focus-ring: 0 0 0 3px rgba(181, 132, 85, 0.45);
  --maxw: 1180px;
  --font-serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition: 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --brown-900: #f0e2d0;
    --brown-800: #e2cdb2;
    --brown-700: #c9a77f;
    --brown-600: #b58455;
    --brown-500: #9c6b3f;
    --brown-300: #6b4a30;
    --brown-100: #2a1d13;
    --brown-50: #1d140d;
    --ink: #f2e8dc;
    --ink-soft: #b9a794;
    --paper: #14100c;
    --card: rgba(38, 27, 18, 0.72);
    --card-border: rgba(181, 132, 85, 0.22);
    --glass-bg: rgba(38, 27, 18, 0.55);
    --glass-border: rgba(181, 132, 85, 0.28);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
    --accent-gradient: linear-gradient(135deg, #b58455 0%, #d9b896 55%, #f5e6d3 100%);
    --banner-gradient: linear-gradient(135deg, #1a120b 0%, #3d2415 40%, #7a4a2b 75%, #9c6b3f 100%);
    --focus-ring: 0 0 0 3px rgba(217, 184, 150, 0.5);
  }
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(15px, 1.05vw + 12px, 17px);
  line-height: 1.85;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(181, 132, 85, 0.1), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(122, 74, 43, 0.08), transparent 46%),
    radial-gradient(circle at 50% 100%, rgba(217, 184, 150, 0.12), transparent 55%);
  background-attachment: fixed;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--brown-700);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover,
a:focus-visible {
  color: var(--brown-600);
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: 6px;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  color: var(--brown-800);
  line-height: 1.35;
  letter-spacing: 0.01em;
  margin: 0 0 0.6em;
  font-weight: 700;
}

h1 {
  font-size: clamp(1.75rem, 3.6vw, 2.9rem);
  letter-spacing: 0.02em;
}

h2 {
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  position: relative;
  padding-bottom: 0.45em;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--accent-gradient);
}

h3 {
  font-size: clamp(1.12rem, 1.5vw, 1.35rem);
  color: var(--brown-700);
  margin-top: 1.6em;
}

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

ul,
ol {
  margin: 0 0 1.2em;
  padding-left: 1.4em;
}

li {
  margin-bottom: 0.5em;
}

strong {
  color: var(--brown-800);
  font-weight: 700;
}

blockquote {
  margin: 1.2em 0;
  padding: 1em 1.4em;
  border-left: 4px solid var(--brown-500);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  font-family: var(--font-serif);
  color: var(--brown-800);
}

blockquote p {
  margin: 0;
}

figcaption {
  margin-top: 0.75em;
  font-size: 0.88em;
  color: var(--ink-soft);
  text-align: center;
  font-style: italic;
}

figure {
  margin: 1.6em 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

figure svg {
  width: 100%;
}

time {
  display: inline-block;
  font-size: 0.82em;
  color: var(--brown-600);
  background: var(--brown-50);
  border: 1px solid var(--card-border);
  padding: 0.15em 0.7em;
  border-radius: var(--radius-pill);
  letter-spacing: 0.03em;
}

header[role="banner"] {
  position: relative;
  padding: clamp(1.6rem, 4vw, 3rem) clamp(1rem, 4vw, 3rem) clamp(1.2rem, 3vw, 2rem);
  background: var(--banner-gradient);
  color: var(--brown-100);
  overflow: hidden;
  isolation: isolate;
}

header[role="banner"]::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 18% 20%, rgba(255, 255, 255, 0.16), transparent 34%),
    radial-gradient(circle at 82% 78%, rgba(255, 255, 255, 0.1), transparent 38%),
    repeating-linear-gradient(115deg, rgba(255, 255, 255, 0.04) 0 2px, transparent 2px 22px);
  z-index: -1;
  pointer-events: none;
}

header[role="banner"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 64px;
  background: var(--paper);
  clip-path: polygon(0 100%, 100% 100%, 100% 0, 0 62%);
  z-index: -1;
}

.brand-bar {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.2rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  color: var(--brown-100);
  letter-spacing: 0.02em;
}

.brand-logo svg {
  flex-shrink: 0;
  border-radius: 10px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  transition: transform var(--transition);
}

.brand-logo:hover svg {
  transform: rotate(-6deg) scale(1.06);
}

.brand-logo strong {
  color: #fff;
  font-size: 1.15em;
  letter-spacing: 0.04em;
}

.brand-slogan {
  margin: 0;
  font-size: 0.85em;
  color: rgba(245, 230, 211, 0.85);
  letter-spacing: 0.06em;
}

header[role="banner"] nav {
  max-width: var(--maxw);
  margin: 1.1rem auto 0;
}

header[role="banner"] nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
}

header[role="banner"] nav a {
  display: inline-block;
  padding: 0.42em 0.95em;
  border-radius: var(--radius-pill);
  font-size: 0.9em;
  color: var(--brown-100);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: background var(--transition), transform var(--transition), color var(--transition), border-color var(--transition);
}

header[role="banner"] nav a:hover,
header[role="banner"] nav a:focus-visible {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
  transform: translateY(-2px);
}

header[role="banner"] form[role="search"] {
  max-width: var(--maxw);
  margin: 1.1rem auto 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.6rem 0.5rem 1.1rem;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  backdrop-filter: blur(14px) saturate(150%);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.14);
}

header[role="banner"] form[role="search"] label {
  font-size: 0.82em;
  color: rgba(245, 230, 211, 0.9);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

header[role="banner"] input[type="search"] {
  flex: 1 1 200px;
  min-width: 0;
  padding: 0.55em 1em;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 0.92em;
  transition: box-shadow var(--transition), background var(--transition);
}

header[role="banner"] input[type="search"]::placeholder {
  color: rgba(107, 87, 72, 0.7);
}

header[role="banner"] input[type="search"]:focus {
  background: #fff;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.4);
}

header[role="banner"] button[type="submit"] {
  flex: 0 0 auto;
  padding: 0.55em 1.5em;
  border: none;
  border-radius: var(--radius-pill);
  background: var(--accent-gradient);
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.92em;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(61, 36, 21, 0.3);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

header[role="banner"] button[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(61, 36, 21, 0.42);
  filter: brightness(1.06);
}

header[role="banner"] button[type="submit"]:active {
  transform: translateY(0);
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 3rem) clamp(1rem, 4vw, 2rem) clamp(2rem, 5vw, 4rem);
  display: flex;
  flex-direction: column;
  gap: clamp(1.4rem, 3vw, 2.4rem);
}

main > section {
  position: relative;
  padding: clamp(1.4rem, 3.2vw, 2.6rem);
  border-radius: var(--radius-lg);
  background: var(--card);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  animation: riseIn 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

main > section:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(181, 132, 85, 0.34);
}

main > section:nth-of-type(2) { animation-delay: 0.05s; }
main > section:nth-of-type(3) { animation-delay: 0.1s; }
main > section:nth-of-type(4) { animation-delay: 0.15s; }
main > section:nth-of-type(5) { animation-delay: 0.2s; }
main > section:nth-of-type(6) { animation-delay: 0.25s; }
main > section:nth-of-type(7) { animation-delay: 0.3s; }
main > section:nth-of-type(8) { animation-delay: 0.35s; }

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

#intro {
  background:
    linear-gradient(135deg, rgba(122, 74, 43, 0.08), rgba(217, 184, 150, 0.12)),
    var(--card);
  border-color: rgba(181, 132, 85, 0.28);
  overflow: hidden;
}

#intro::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(181, 132, 85, 0.22), transparent 70%);
  pointer-events: none;
}

#intro h1 {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.1);
}

.lead {
  font-size: clamp(1rem, 1.2vw, 1.12rem);
  line-height: 1.95;
  color: var(--ink);
  padding: 1.1em 1.3em;
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

main > section > article {
  position: relative;
  margin: 1.4em 0;
  padding: 1.3em 1.5em;
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
}

main > section > article:hover {
  transform: translateY(-4px) scale(1.005);
  box-shadow: var(--shadow-md);
  border-color: rgba(181, 132, 85, 0.4);
  background: rgba(255, 255, 255, 0.82);
}

@media (prefers-color-scheme: dark) {
  main > section > article:hover {
    background: rgba(48, 34, 23, 0.85);
  }
}

main > section > article h3 {
  margin-top: 0;
}

main > section > article a[href^="#article"] {
  display: inline-block;
  margin-top: 0.4em;
  padding: 0.4em 1.2em;
  border-radius: var(--radius-pill);
  font-size: 0.88em;
  font-weight: 600;
  color: var(--brown-700);
  background: var(--brown-50);
  border: 1px solid var(--card-border);
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
}

main > section > article a[href^="#article"]:hover {
  background: var(--accent-gradient);
  color: #fff;
  transform: translateX(4px);
  box-shadow: 0 4px 14px rgba(122, 74, 43, 0.3);
}

#about ul,
#products ul,
#solutions ul,
#howto ul,
#howto ol {
  padding-left: 1.2em;
}

#about ul li,
#products ul li,
#solutions ul li,
#howto ul li,
#howto ol li {
  padding-left: 0.3em;
}

#about ul li::marker,
#products ul li::marker,
#solutions ul li::marker,
#howto ul li::marker,
#howto ol li::marker {
  color: var(--brown-500);
  font-weight: 700;
}

#cases blockquote {
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
}

#cases blockquote::before {
  content: "\201C";
  position: absolute;
  top: -0.15em;
  left: 0.3em;
  font-family: var(--font-serif);
  font-size: 3.2em;
  line-height: 1;
  color: var(--brown-300);
  opacity: 0.6;
  pointer-events: none;
}

#cases blockquote:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

#news article {
  border-left: 3px solid var(--brown-500);
}

#faq h3 {
  display: flex;
  align-items: baseline;
  gap: 0.5em;
  padding: 0.6em 1em;
  margin-top: 1.4em;
  margin-bottom: 0.4em;
  border-radius: var(--radius-sm);
  background: linear-gradient(90deg, rgba(181, 132, 85, 0.12), transparent);
  border-left: 3px solid var(--brown-500);
  transition: background var(--transition), padding-left var(--transition);
}

#faq h3:hover {
  background: linear-gradient(90deg, rgba(181, 132, 85, 0.2), transparent);
  padding-left: 1.3em;
}

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

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 0.7em 1em 0.7em 3.2em;
  margin-bottom: 0.6em;
  border-radius: var(--radius-sm);
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 0.8em;
  top: 50%;
  transform: translateY(-50%);
  width: 1.7em;
  height: 1.7em;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #fff;
  font-size: 0.85em;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(122, 74, 43, 0.3);
}

#howto ol li:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
  background: rgba(255, 255, 255, 0.85);
}

@media (prefers-color-scheme: dark) {
  #howto ol li:hover {
    background: rgba(48, 34, 23, 0.88);
  }
}

#contact address {
  font-style: normal;
  padding: 1.2em 1.4em;
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

#contact address p {
  margin: 0.35em 0;
  color: var(--ink);
}

#contact address p:first-child {
  font-weight: 700;
  color: var(--brown-800);
}

#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.5rem;
}

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

#sitemap ul a,
#links ul a {
  display: block;
  padding: 0.55em 1em;
  border-radius: var(--radius-sm);
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  font-size: 0.92em;
  transition: background var(--transition), transform var(--transition), color var(--transition), border-color var(--transition);
}

#sitemap ul a:hover,
#links ul a:hover {
  background: var(--brown-50);
  border-color: var(--brown-500);
  transform: translateY(-2px);
  color: var(--brown-800);
}

footer[role="contentinfo"] {
  margin-top: clamp(1.5rem, 4vw, 3rem);
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1rem, 4vw, 2rem) clamp(1.5rem, 3vw, 2rem);
  background: var(--banner-gradient);
  color: var(--brown-100);
  position: relative;
  overflow: hidden;
}

footer[role="contentinfo"]::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 85% 15%, rgba(255, 255, 255, 0.1), transparent 40%),
    repeating-linear-gradient(75deg, rgba(255, 255, 255, 0.035) 0 2px, transparent 2px 26px);
  pointer-events: none;
}

footer[role="contentinfo"] > section {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto 1.6rem;
  padding: 1.2em 1.5em;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--transition), transform var(--transition);
}

footer[role="contentinfo"] > section:hover {
  background: rgba(255, 255, 255, 0.13);
  transform: translateY(-2px);
}

footer[role="contentinfo"] h2 {
  font-size: 1.05rem;
  color: #fff;
  margin-bottom: 0.5em;
  padding-bottom: 0.3em;
}

footer[role="contentinfo"] h2::after {
  width: 40px;
  height: 2px;
  background: rgba(255, 255, 255, 0.6);
}

footer[role="contentinfo"] p {
  color: rgba(245, 230, 211, 0.88);
  font-size: 0.9em;
  margin: 0;
}

footer[role="contentinfo"] > p:last-child {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  text-align: center;
  font-size: 0.82em;
  letter-spacing: 0.04em;
  color: rgba(245, 230, 211, 0.7);
}

@media (max-width: 860px) {
  .brand-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  header[role="banner"] nav ul {
    justify-content: flex-start;
  }

  header[role="banner"] form[role="search"] {
    flex-direction: column;
    align-items: stretch;
    border-radius: var(--radius-md);
    padding: 0.8rem;
  }

  header[role="banner"] form[role="search"] label {
    padding-left: 0.4rem;
  }

  header[role="banner"] input[type="search"],
  header[role="banner"] button[type="submit"] {
    width: 100%;
  }

  main > section {
    padding: 1.2rem 1rem;
    border-radius: var(--radius-md);
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
}

@media (max-width: 520px) {
  body {
    line-height: 1.75;
  }

  h2::after {
    width: 44px;
  }

  .lead {
    padding: 0.9em 1em;
    font-size: 0.95rem;
  }

  main > section > article {
    padding: 1em 1.05em;
  }

  #faq h3 {
    font-size: 1rem;
    padding: 0.5em 0.7em;
  }

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

@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 print {
  header[role="banner"],
  footer[role="contentinfo"] {
    background: none;
    color: #000;
  }

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

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