:root {
  --bg: #0b0618;
  --bg-alt: #130a26;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-strong: rgba(255, 255, 255, 0.08);
  --glass: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.12);
  --text: #ece7f8;
  --text-muted: #a99fc4;
  --text-dim: #7d739c;
  --primary: #8b5cf6;
  --primary-strong: #6d28d9;
  --accent: #facc15;
  --accent-soft: #fde047;
  --cyan: #38bdf8;
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --shadow-sm: 0 8px 24px rgba(0, 0, 0, 0.35);
  --radius: 20px;
  --radius-sm: 14px;
  --radius-lg: 28px;
  --maxw: 1240px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 0.35s var(--ease);
}

[data-theme="light"] {
  --bg: #f5f2fb;
  --bg-alt: #ece5f8;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-strong: rgba(255, 255, 255, 0.9);
  --glass: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(109, 40, 217, 0.15);
  --text: #241545;
  --text-muted: #5b4d7d;
  --text-dim: #7a6d99;
  --primary: #6d28d9;
  --primary-strong: #5b21b6;
  --accent: #d97706;
  --accent-soft: #f59e0b;
  --cyan: #0284c7;
  --border: rgba(109, 40, 217, 0.12);
  --shadow: 0 18px 50px rgba(76, 29, 149, 0.16);
  --shadow-sm: 0 8px 24px rgba(76, 29, 149, 0.12);
}

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

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

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  background:
    radial-gradient(1200px 600px at 85% -5%, rgba(139, 92, 246, 0.22), transparent 60%),
    radial-gradient(900px 500px at 5% 10%, rgba(56, 189, 248, 0.14), transparent 55%),
    radial-gradient(800px 600px at 50% 110%, rgba(250, 204, 21, 0.08), transparent 60%),
    var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  letter-spacing: 0.01em;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.5s var(--ease), color 0.5s var(--ease);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: 0.5;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4 {
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

h1 {
  font-size: clamp(1.75rem, 4.5vw, 2.9rem);
  background: linear-gradient(120deg, var(--text) 20%, var(--primary) 60%, var(--cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin-bottom: 1rem;
  position: relative;
  padding-bottom: 0.6rem;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  margin: 1.6rem 0 0.7rem;
  color: var(--text);
}

p {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.visually-hidden,
#site-search label.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============ HEADER ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}

#site-header.scrolled {
  box-shadow: var(--shadow-sm);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
}

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text);
  flex-shrink: 0;
}

.logo svg {
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.25), 0 8px 20px rgba(109, 40, 217, 0.5);
  transition: transform var(--transition), box-shadow var(--transition);
}

.logo:hover svg {
  transform: rotate(-12deg) scale(1.08);
  box-shadow: 0 0 0 5px rgba(250, 204, 21, 0.3), 0 10px 28px rgba(250, 204, 21, 0.4);
}

.logo-text {
  background: linear-gradient(90deg, var(--text), var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#main-nav {
  flex: 1 1 auto;
  min-width: 0;
}

#main-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  justify-content: center;
}

#main-nav a {
  display: inline-block;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  font-size: 0.92rem;
  color: var(--text-muted);
  position: relative;
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

#main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: translateX(-50%);
  transition: width var(--transition);
}

#main-nav a:hover,
#main-nav a:focus-visible {
  color: var(--text);
  background: var(--surface-strong);
  transform: translateY(-2px);
}

#main-nav a:hover::after,
#main-nav a:focus-visible::after {
  width: 60%;
}

#menu-toggle,
#theme-toggle {
  border: 1px solid var(--glass-border);
  background: var(--surface);
  color: var(--text);
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#menu-toggle {
  display: none;
}

#menu-toggle:hover,
#theme-toggle:hover {
  background: var(--primary-strong);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(109, 40, 217, 0.45);
  border-color: transparent;
}

#site-search {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  padding: 0.25rem 0.35rem 0.25rem 0.9rem;
  backdrop-filter: blur(10px);
  transition: border-color var(--transition), box-shadow var(--transition);
}

#site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.18);
}

#search-input {
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 0.88rem;
  padding: 0.4rem 0;
  width: 170px;
  outline: none;
}

#search-input::placeholder {
  color: var(--text-dim);
}

#site-search button {
  border: none;
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

#site-search button:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 20px rgba(109, 40, 217, 0.5);
  filter: brightness(1.1);
}

/* ============ MAIN LAYOUT ============ */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
  position: relative;
  z-index: 1;
}

main > section {
  margin-bottom: 3.5rem;
  scroll-margin-top: 90px;
}

/* ============ BANNER ============ */
#banner {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--glass-border);
  background: var(--bg-alt);
  isolation: isolate;
}

.banner-slides {
  position: relative;
  min-height: 360px;
}

.banner-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transform: scale(1.04);
  transition: opacity 0.7s var(--ease), transform 0.9s var(--ease), visibility 0.7s;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 2rem;
  background: linear-gradient(180deg, rgba(11, 6, 24, 0) 30%, rgba(11, 6, 24, 0.88) 100%);
}

.banner-slide.active {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
  position: relative;
}

.banner-slide svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
}

.banner-slide h2 {
  font-size: clamp(1.3rem, 3vw, 2.1rem);
  margin-bottom: 0.5rem;
  color: #fff;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.7);
  animation: slideUp 0.8s var(--ease) both;
}

.banner-slide h2::after {
  background: linear-gradient(90deg, var(--accent), var(--primary));
}

.banner-slide p {
  color: rgba(255, 255, 255, 0.88);
  max-width: 640px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
  animation: slideUp 0.8s 0.12s var(--ease) both;
}

.banner-controls {
  position: absolute;
  right: 1.25rem;
  bottom: 1.25rem;
  display: flex;
  gap: 0.6rem;
  z-index: 5;
}

.banner-controls button {
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.banner-controls button:hover {
  background: var(--primary-strong);
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(109, 40, 217, 0.55);
  border-color: transparent;
}

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

/* ============ BREADCRUMB ============ */
#breadcrumb {
  margin-bottom: 1.5rem;
}

#breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}

#breadcrumb li:not(:last-child)::after {
  content: "›";
  margin-left: 0.5rem;
  color: var(--primary);
}

#breadcrumb a {
  color: var(--text-muted);
}

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

#breadcrumb [aria-current="page"] {
  color: var(--primary);
  font-weight: 600;
}

/* ============ CARDS / SECTIONS ============ */
#intro,
#brand,
#products,
#advantages,
#solutions,
#applications,
#cases,
#reviews,
#news,
#articles,
#faq,
#howto,
#contact,
#sitemap,
#links,
#editorial,
#legal {
  background: var(--surface);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

#intro::before,
#brand::before,
#products::before,
#advantages::before,
#solutions::before,
#applications::before,
#cases::before,
#reviews::before,
#news::before,
#articles::before,
#faq::before,
#howto::before,
#contact::before,
#sitemap::before,
#links::before,
#editorial::before,
#legal::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -20%;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.18), transparent 70%);
  pointer-events: none;
}

#intro:hover,
#brand:hover,
#products:hover,
#advantages:hover,
#solutions:hover,
#applications:hover,
#cases:hover,
#reviews:hover,
#news:hover,
#articles:hover,
#faq:hover,
#howto:hover,
#contact:hover,
#sitemap:hover,
#links:hover,
#editorial:hover,
#legal:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(139, 92, 246, 0.35);
}

/* ============ STATS ============ */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-top: 1.75rem;
}

.stat-item {
  background: linear-gradient(145deg, rgba(139, 92, 246, 0.16), rgba(56, 189, 248, 0.08));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.stat-item:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 14px 34px rgba(109, 40, 217, 0.35);
  background: linear-gradient(145deg, rgba(139, 92, 246, 0.28), rgba(56, 189, 248, 0.14));
}

.stat-number {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  background: linear-gradient(120deg, var(--accent), var(--primary), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ============ REVIEWS ============ */
#reviews blockquote {
  position: relative;
  background: var(--surface-strong);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem 1.25rem 2.75rem;
  margin-bottom: 1rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

#reviews blockquote::before {
  content: "“";
  position: absolute;
  left: 0.75rem;
  top: 0.2rem;
  font-size: 2.6rem;
  line-height: 1;
  color: var(--primary);
  opacity: 0.6;
  font-family: Georgia, serif;
}

#reviews blockquote:hover {
  transform: translateX(6px);
  border-color: var(--accent);
  box-shadow: 0 10px 28px rgba(109, 40, 217, 0.28);
}

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

/* ============ NEWS ============ */
#news ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

#news li {
  background: var(--surface-strong);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#news li:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 38px rgba(109, 40, 217, 0.32);
  border-color: rgba(139, 92, 246, 0.4);
}

#news h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

#news h3 a {
  color: var(--text);
}

#news h3 a:hover {
  color: var(--accent);
}

#news li p:first-of-type {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

/* ============ ARTICLES ============ */
#articles {
  display: block;
}

#articles > p {
  margin-bottom: 1.5rem;
}

#articles article {
  background: var(--surface-strong);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 1.4rem 1.5rem;
  margin-bottom: 1rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

#articles article::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--primary), var(--accent));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

#articles article:hover {
  transform: translateX(8px);
  box-shadow: 0 14px 34px rgba(109, 40, 217, 0.3);
  border-color: rgba(139, 92, 246, 0.4);
}

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

#articles article h3 {
  margin-top: 0;
  font-size: 1.15rem;
}

#articles article p:first-of-type {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

#articles article a {
  display: inline-block;
  margin-top: 0.4rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  position: relative;
  transition: transform var(--transition), letter-spacing var(--transition);
}

#articles article a:hover {
  transform: translateX(6px);
  letter-spacing: 0.03em;
}

/* ============ FAQ ============ */
#faq details {
  background: var(--surface-strong);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.85rem;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

#faq details[open] {
  border-color: rgba(139, 92, 246, 0.45);
  box-shadow: 0 12px 30px rgba(109, 40, 217, 0.28);
  background: linear-gradient(145deg, rgba(139, 92, 246, 0.12), rgba(56, 189, 248, 0.05));
}

#faq summary {
  cursor: pointer;
  list-style: none;
  padding: 1rem 1.25rem;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transition: color var(--transition), background var(--transition);
}

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

#faq summary::after {
  content: "+";
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  background: rgba(139, 92, 246, 0.18);
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

#faq details[open] summary::after {
  content: "–";
  transform: rotate(180deg);
  background: var(--primary);
  color: #fff;
}

#faq summary:hover {
  color: var(--accent);
  background: rgba(139, 92, 246, 0.08);
}

#faq details p {
  padding: 0 1.25rem 1.25rem;
  margin: 0;
  font-size: 0.92rem;
  animation: fadeIn 0.4s var(--ease) both;
}

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

/* ============ HOWTO ============ */
#howto ol {
  counter-reset: step;
  display: grid;
  gap: 0.85rem;
  margin: 1rem 0 1.5rem;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 0.9rem 1rem 0.9rem 3.4rem;
  background: var(--surface-strong);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  box-shadow: 0 6px 16px rgba(109, 40, 217, 0.45);
}

#howto ol li:hover {
  transform: translateX(8px);
  border-color: rgba(139, 92, 246, 0.4);
  box-shadow: 0 10px 26px rgba(109, 40, 217, 0.28);
}

/* ============ CONTACT ============ */
#contact address {
  font-style: normal;
  display: grid;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

#contact address p {
  margin: 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--text-muted);
}

#contact address p::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

#contact address a {
  color: var(--accent);
  font-weight: 600;
}

#contact address a:hover {
  color: var(--cyan);
}

/* ============ SITEMAP / LINKS ============ */
#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.6rem;
  margin-top: 1rem;
}

#sitemap li a,
#links li a {
  display: block;
  padding: 0.65rem 1rem;
  background: var(--surface-strong);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: transform var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
}

#sitemap li a:hover,
#links li a:hover {
  transform: translateY(-4px);
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 12px 28px rgba(109, 40, 217, 0.4);
}

/* ============ FOOTER ============ */
#site-footer {
  background: linear-gradient(180deg, transparent, rgba(109, 40, 217, 0.12));
  border-top: 1px solid var(--glass-border);
  padding: 2.5rem 1.25rem 2rem;
  margin-top: 2rem;
  position: relative;
  z-index: 1;
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  text-align: center;
  display: grid;
  gap: 0.6rem;
}

.footer-inner p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.footer-inner nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.25rem;
  margin-top: 0.5rem;
}

.footer-inner nav a {
  font-size: 0.85rem;
  color: var(--text-muted);
  position: relative;
}

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

/* ============ BACK TO TOP ============ */
#back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 90;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  backdrop-filter: blur(14px);
  color: var(--text);
  padding: 0.7rem 1.1rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  box-shadow: var(--shadow-sm);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), background var(--transition), box-shadow var(--transition);
}

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

#back-to-top:hover {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #fff;
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 14px 32px rgba(109, 40, 217, 0.5);
  border-color: transparent;
}

/* ============ SCROLL REVEAL ============ */
.reveal {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
  will-change: opacity, transform;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  #main-nav ul {
    gap: 0.2rem;
  }

  #main-nav a {
    padding: 0.4rem 0.65rem;
    font-size: 0.85rem;
  }

  #search-input {
    width: 130px;
  }
}

@media (max-width: 860px) {
  .header-inner {
    gap: 0.6rem;
  }

  #menu-toggle {
    display: inline-block;
    order: 2;
    margin-left: auto;
  }

  #theme-toggle {
    order: 3;
  }

  #site-search {
    order: 4;
    flex: 1 1 100%;
    margin-top: 0.25rem;
  }

  #search-input {
    width: 100%;
    flex: 1;
  }

  #main-nav {
    order: 5;
    flex: 1 1 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s var(--ease), opacity 0.35s var(--ease);
    opacity: 0;
  }

  #main-nav.open {
    max-height: 520px;
    opacity: 1;
  }

  #main-nav ul {
    flex-direction: column;
    gap: 0.2rem;
    padding: 0.5rem 0 0.75rem;
  }

  #main-nav a {
    display: block;
    padding: 0.65rem 1rem;
    border-radius: var(--radius-sm);
    background: var(--surface);
    border: 1px solid var(--glass-border);
  }

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

  .banner-slides {
    min-height: 300px;
  }

  .banner-slide {
    padding: 1.5rem;
  }

  main > section {
    margin-bottom: 2.5rem;
  }

  #intro,
  #brand,
  #products,
  #advantages,
  #solutions,
  #applications,
  #cases,
  #reviews,
  #news,
  #articles,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links,
  #editorial,
  #legal {
    padding: 1.5rem;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 15px;
  }

  .header-inner {
    padding: 0.6rem 0.9rem;
  }

  .logo-text {
    font-size: 1.05rem;
  }

  main {
    padding: 1rem 0.9rem 3rem;
  }

  .banner-slides {
    min-height: 260px;
  }

  .banner-slide {
    padding: 1.1rem;
  }

  .banner-controls {
    right: 0.8rem;
    bottom: 0.8rem;
    gap: 0.4rem;
  }

  .banner-controls button {
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.7rem;
  }

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

  #howto ol li {
    padding-left: 3rem;
  }

  #back-to-top {
    right: 0.8rem;
    bottom: 0.8rem;
    padding: 0.6rem 0.9rem;
    font-size: 0.75rem;
  }
}

@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;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

::selection {
  background: rgba(139, 92, 246, 0.5);
  color: #fff;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary), var(--primary-strong));
  border-radius: 999px;
  border: 2px solid var(--bg-alt);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--accent), var(--primary));
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}