:root {
  --primary: #6d5dfc;
  --primary-dark: #4c3fd6;
  --primary-light: #8b7ffd;
  --accent: #ff6b9d;
  --accent-dark: #e84a7f;
  --gradient-1: linear-gradient(135deg, #6d5dfc 0%, #a855f7 50%, #ff6b9d 100%);
  --gradient-2: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  --gradient-3: linear-gradient(120deg, #6d5dfc 0%, #ff6b9d 100%);
  --bg: #f7f7fc;
  --bg-alt: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.55);
  --bg-glass-border: rgba(255, 255, 255, 0.6);
  --text: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #7a7a9a;
  --border: rgba(109, 93, 252, 0.12);
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.1);
  --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.14);
  --shadow-glow: 0 8px 32px rgba(109, 93, 252, 0.3);
  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 72px;
}

[data-theme="dark"] {
  --primary: #8b7ffd;
  --primary-dark: #6d5dfc;
  --primary-light: #a89dff;
  --accent: #ff7faa;
  --accent-dark: #ff6b9d;
  --bg: #0d0d1a;
  --bg-alt: #14142b;
  --bg-card: rgba(30, 30, 60, 0.6);
  --bg-glass: rgba(20, 20, 43, 0.65);
  --bg-glass-border: rgba(139, 127, 253, 0.15);
  --text: #eaeaf5;
  --text-secondary: #b0b0d0;
  --text-muted: #7a7a9a;
  --border: rgba(139, 127, 253, 0.15);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 8px 32px rgba(139, 127, 253, 0.25);
}

*,
*::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: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  font-size: inherit;
}

input {
  font-family: inherit;
  font-size: inherit;
}

/* ============ HEADER ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--bg-glass-border);
  transition: background var(--transition), box-shadow var(--transition);
}

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--text);
}

.brand-logo svg {
  border-radius: 12px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.brand-logo:hover svg {
  transform: rotate(-6deg) scale(1.05);
  box-shadow: var(--shadow-glow);
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: var(--gradient-3);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.main-nav ul {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 999px;
  position: relative;
  transition: color var(--transition), background var(--transition);
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  background: var(--gradient-3);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition);
}

.main-nav a:hover {
  color: var(--primary);
  background: rgba(109, 93, 252, 0.08);
}

.main-nav a:hover::after {
  width: 60%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.search-form {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-form:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(109, 93, 252, 0.15);
}

.search-form input {
  border: none;
  outline: none;
  background: transparent;
  padding: 8px 16px;
  width: 180px;
  color: var(--text);
  font-size: 0.85rem;
}

.search-form input::placeholder {
  color: var(--text-muted);
}

.search-form button {
  padding: 8px 16px;
  background: var(--gradient-3);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  transition: opacity var(--transition);
}

.search-form button:hover {
  opacity: 0.88;
}

.theme-toggle,
.menu-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
}

.theme-toggle:hover,
.menu-toggle:hover {
  transform: scale(1.1) rotate(12deg);
  box-shadow: var(--shadow-glow);
}

.menu-toggle {
  display: none;
}

/* ============ HERO ============ */
.hero-banner {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--gradient-1);
  isolation: isolate;
}

.hero-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.18) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(255, 107, 157, 0.25) 0%, transparent 50%),
    radial-gradient(circle at 50% 100%, rgba(26, 26, 46, 0.35) 0%, transparent 60%);
  z-index: -1;
}

.hero-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255, 255, 255, 0.12) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.5;
  z-index: -1;
  animation: heroFloat 20s linear infinite;
}

@keyframes heroFloat {
  0% { background-position: 0 0; }
  100% { background-position: 32px 32px; }
}

.hero-slide {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 24px;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s ease;
  pointer-events: none;
  max-width: 900px;
  margin: 0 auto;
}

.hero-slide.active {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.hero-slide h1,
.hero-slide h2 {
  font-size: clamp(1.8rem, 4.5vw, 3rem);
  font-weight: 800;
  line-height: 1.25;
  color: #fff;
  letter-spacing: -0.5px;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  margin-bottom: 20px;
}

.hero-sub {
  font-size: clamp(0.95rem, 1.8vw, 1.15rem);
  color: rgba(255, 255, 255, 0.92);
  max-width: 680px;
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-cta {
  display: inline-block;
  padding: 14px 40px;
  background: rgba(255, 255, 255, 0.95);
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 1rem;
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.hero-cta:hover {
  transform: translateY(-4px) scale(1.03);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
  background: #fff;
  color: var(--accent-dark);
}

.hero-dots {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.45);
  transition: width var(--transition), background var(--transition);
}

.dot.active {
  width: 32px;
  background: #fff;
}

.dot:hover {
  background: rgba(255, 255, 255, 0.8);
}

/* ============ BREADCRUMB ============ */
.breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px 24px 0;
}

.breadcrumb ol {
  display: flex;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-secondary);
}

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

/* ============ SECTIONS ============ */
main > section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 64px 24px;
}

main > section:nth-child(even) {
  position: relative;
}

main > section h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 24px;
  color: var(--text);
  position: relative;
  padding-left: 18px;
}

main > section h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 70%;
  border-radius: 999px;
  background: var(--gradient-3);
}

main > section h3 {
  font-size: clamp(1.15rem, 2vw, 1.35rem);
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--text);
}

main > section h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 20px 0 8px;
  color: var(--primary);
}

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

main > section ul,
main > section ol {
  margin: 12px 0 20px;
  padding-left: 4px;
}

main > section ul li,
main > section ol li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 10px;
  color: var(--text-secondary);
  line-height: 1.8;
}

main > section ul li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 11px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-3);
  box-shadow: 0 0 0 3px rgba(109, 93, 252, 0.15);
}

main > section ol {
  counter-reset: item;
}

main > section ol li {
  counter-increment: item;
  padding-left: 36px;
}

main > section ol li::before {
  content: counter(item);
  position: absolute;
  left: 0;
  top: 2px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--gradient-3);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ============ SCROLL ANIMATION ============ */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ============ BRAND INTRO ============ */
.brand-intro {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  margin-top: 20px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: box-shadow var(--transition);
}

.brand-intro:hover {
  box-shadow: var(--shadow-md);
}

/* ============ COMPANY PROFILE ============ */
.company-profile {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.company-profile ul li {
  padding: 14px 18px 14px 44px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.company-profile ul li::before {
  left: 18px;
  top: 22px;
}

.company-profile ul li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
  border-color: var(--primary);
}

/* ============ BRAND HISTORY ============ */
.brand-history {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.brand-history h3 {
  display: inline-block;
  padding: 6px 16px;
  background: linear-gradient(135deg, rgba(109, 93, 252, 0.1), rgba(255, 107, 157, 0.1));
  border-radius: 999px;
  border-left: 3px solid var(--primary);
}

/* ============ COMPANY CULTURE ============ */
.company-culture {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.company-culture h3 {
  position: relative;
  padding-left: 16px;
}

.company-culture h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 60%;
  border-radius: 999px;
  background: var(--gradient-3);
}

/* ============ PRODUCTS ============ */
.products {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.products h3 {
  padding: 16px 20px;
  background: linear-gradient(135deg, rgba(109, 93, 252, 0.06), rgba(255, 107, 157, 0.06));
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-top: 32px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.products h3:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

.products h4 {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(109, 93, 252, 0.08);
  border-radius: 999px;
  font-size: 0.95rem;
}

/* ============ ADVANTAGES ============ */
.product-advantages {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 0 32px;
}

.product-advantages h2 {
  grid-column: 1 / -1;
}

.product-advantages h3 {
  padding: 20px 24px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin: 12px 0 0;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.product-advantages h3::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-3);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

.product-advantages h3:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.product-advantages h3:hover::after {
  transform: scaleY(1);
}

.product-advantages p {
  padding: 0 4px;
}

/* ============ SOLUTIONS ============ */
.solutions {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.solutions h3 {
  padding: 14px 20px;
  background: linear-gradient(135deg, rgba(109, 93, 252, 0.08), rgba(255, 107, 157, 0.06));
  border-radius: var(--radius);
  border-left: 4px solid var(--primary);
  margin-top: 32px;
}

.solutions h4 {
  margin-top: 20px;
  color: var(--accent);
}

.solutions ul {
  background: var(--bg-card);
  padding: 16px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.solutions ul li {
  padding: 10px 10px 10px 34px;
  margin-bottom: 6px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition);
}

.solutions ul li::before {
  left: 12px;
  top: 18px;
}

.solutions ul li:hover {
  background: rgba(109, 93, 252, 0.06);
  transform: translateX(4px);
}

/* ============ INDUSTRY APPLICATION ============ */
.industry-application {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.industry-application h3 {
  padding: 16px 20px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-top: 20px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.industry-application h3:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-sm);
  border-color: var(--primary);
}

/* ============ CUSTOMER CASES ============ */
.customer-cases {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.customer-cases h3 {
  padding: 16px 20px;
  background: linear-gradient(135deg, rgba(109, 93, 252, 0.06), rgba(255, 107, 157, 0.06));
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-top: 24px;
}

.customer-cases blockquote {
  position: relative;
  padding: 24px 28px 24px 56px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin: 16px 0;
  transition: transform var(--transition), box-shadow var(--transition);
}

.customer-cases blockquote::before {
  content: "\201C";
  position: absolute;
  left: 20px;
  top: 8px;
  font-size: 3rem;
  line-height: 1;
  font-family: Georgia, serif;
  background: var(--gradient-3);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.customer-cases blockquote:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.customer-cases blockquote p {
  font-style: italic;
  color: var(--text-secondary);
  margin: 0;
}

/* ============ NEWS CENTER ============ */
.news-center {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.news-item {
  padding: 24px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 16px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.news-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-3);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.news-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.news-item:hover::before {
  transform: scaleX(1);
}

.news-item h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.news-item h3 a {
  color: var(--text);
  transition: color var(--transition);
}

.news-item h3 a:hover {
  color: var(--primary);
}

.news-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ============ TECH ARTICLES ============ */
.tech-articles {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.article-item {
  padding: 24px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 16px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.article-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--gradient-3);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

.article-item:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.article-item:hover::before {
  transform: scaleY(1);
}

.article-item h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.article-item h3 a {
  color: var(--text);
}

.article-item h3 a:hover {
  color: var(--primary);
}

.article-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

/* ============ INDUSTRY KNOWLEDGE ============ */
.industry-knowledge {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.industry-knowledge h3 {
  padding: 14px 20px;
  background: linear-gradient(135deg, rgba(109, 93, 252, 0.08), rgba(255, 107, 157, 0.06));
  border-radius: var(--radius);
  border-left: 4px solid var(--accent);
  margin-top: 24px;
}

/* ============ FAQ ============ */
.faq {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.faq details {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.faq details[open] {
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.faq details:hover {
  border-color: var(--primary-light);
}

.faq summary {
  padding: 18px 24px;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: color var(--transition), background var(--transition);
  position: relative;
}

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

.faq summary::after {
  content: "+";
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform var(--transition);
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(109, 93, 252, 0.08);
}

.faq details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
  background: var(--gradient-3);
  color: #fff;
}

.faq summary:hover {
  background: rgba(109, 93, 252, 0.04);
}

.faq details p {
  padding: 0 24px 20px;
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.85;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ HOWTO ============ */
.howto {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.howto h3 {
  padding: 14px 20px;
  background: linear-gradient(135deg, rgba(109, 93, 252, 0.08), rgba(255, 107, 157, 0.06));
  border-radius: var(--radius);
  border-left: 4px solid var(--primary);
  margin-top: 28px;
}

.howto ol {
  background: var(--bg-card);
  padding: 20px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.howto ol li {
  padding: 12px 12px 12px 44px;
  margin-bottom: 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition);
}

.howto ol li::before {
  left: 12px;
  top: 14px;
}

.howto ol li:hover {
  background: rgba(109, 93, 252, 0.06);
  transform: translateX(4px);
}

.howto ul {
  background: var(--bg-card);
  padding: 16px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* ============ CONTACT ============ */
.contact {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.contact-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
  margin: 20px 0;
}

.contact-list li {
  padding: 16px 20px 16px 44px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  font-size: 0.95rem;
}

.contact-list li::before {
  left: 18px;
  top: 24px;
}

.contact-list li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.contact h3 {
  margin-top: 32px;
  padding: 14px 20px;
  background: linear-gradient(135deg, rgba(109, 93, 252, 0.08), rgba(255, 107, 157, 0.06));
  border-radius: var(--radius);
  border-left: 4px solid var(--primary);
}

/* ============ SITE MAP & FRIEND LINKS ============ */
.site-map,
.friend-links {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.site-map ul,
.friend-links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
  margin-top: 16px;
}

.site-map ul li,
.friend-links ul li {
  padding: 12px 16px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  text-align: center;
}

.site-map ul li::before,
.friend-links ul li::before {
  display: none;
}

.site-map ul li:hover,
.friend-links ul li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
  border-color: var(--primary);
}

.site-map ul li a,
.friend-links ul li a {
  display: block;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

.site-map ul li a:hover,
.friend-links ul li a:hover {
  color: var(--primary);
}

/* ============ FOOTER ============ */
.site-footer {
  background: var(--gradient-2);
  color: #e0e0f0;
  margin-top: 40px;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-3);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 60px 24px 40px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px;
}

.footer-brand h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  background: var(--gradient-3);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer-brand p {
  color: rgba(224, 224, 240, 0.7);
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-links h3,
.footer-legal h3,
.footer-meta h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: #fff;
  position: relative;
  padding-bottom: 8px;
}

.footer-links h3::after,
.footer-legal h3::after,
.footer-meta h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 2px;
  background: var(--gradient-3);
  border-radius: 2px;
}

.footer-links ul li,
.footer-legal ul li {
  margin-bottom: 10px;
}

.footer-links a,
.footer-legal a {
  color: rgba(224, 224, 240, 0.7);
  font-size: 0.9rem;
  transition: color var(--transition), padding-left var(--transition);
  position: relative;
}

.footer-links a:hover,
.footer-legal a:hover {
  color: #fff;
  padding-left: 6px;
}

.footer-meta p {
  color: rgba(224, 224, 240, 0.7);
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.site-footer section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.site-footer section h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.site-footer section p {
  color: rgba(224, 224, 240, 0.6);
  font-size: 0.85rem;
  line-height: 1.8;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px 24px 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
}

.footer-bottom p {
  color: rgba(224, 224, 240, 0.5);
  font-size: 0.82rem;
}

/* ============ BACK TO TOP ============ */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-3);
  color: #fff;
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
  z-index: 999;
}

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

.back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 12px 40px rgba(109, 93, 252, 0.45);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--bg-glass-border);
    padding: 16px 24px;
    box-shadow: var(--shadow-md);
  }

  .main-nav.open {
    display: block;
    animation: slideDown 0.3s ease;
  }

  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-12px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .main-nav ul {
    flex-direction: column;
    gap: 4px;
  }

  .main-nav a {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }

  .menu-toggle {
    display: flex;
  }

  .search-form input {
    width: 140px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  .brand-name {
    font-size: 1.15rem;
  }

  .brand-logo svg {
    width: 36px;
    height: 36px;
  }

  .search-form {
    display: none;
  }

  .hero-banner {
    min-height: 460px;
  }

  .hero-slide {
    padding: 48px 20px;
  }

  main > section {
    padding: 44px 16px;
  }

  .breadcrumb {
    padding: 16px 16px 0;
  }

  .product-advantages {
    grid-template-columns: 1fr;
  }

  .contact-list {
    grid-template-columns: 1fr;
  }

  .site-map ul,
  .friend-links ul {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }

  .footer-inner {
    padding: 40px 16px 24px;
    gap: 28px;
  }

  .site-footer section {
    padding: 20px 16px;
  }

  .footer-bottom {
    padding: 16px 16px 24px;
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }
}

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

  .hero-banner {
    min-height: 420px;
  }

  .hero-slide h1,
  .hero-slide h2 {
    font-size: 1.5rem;
  }

  .hero-sub {
    font-size: 0.9rem;
  }

  .hero-cta {
    padding: 12px 32px;
    font-size: 0.9rem;
  }

  main > section {
    padding: 36px 14px;
  }

  main > section h2 {
    font-size: 1.35rem;
  }

  .news-item,
  .article-item {
    padding: 18px;
  }

  .faq summary {
    padding: 16px 18px;
    font-size: 0.95rem;
  }

  .faq details p {
    padding: 0 18px 16px;
  }

  .customer-cases blockquote {
    padding: 20px 20px 20px 48px;
  }

  .customer-cases blockquote::before {
    left: 14px;
    font-size: 2.4rem;
  }

  .site-map ul,
  .friend-links ul {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============ REDUCED MOTION ============ */
@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;
  }

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

/* ============ PRINT ============ */
@media print {
  .site-header,
  .hero-banner,
  .back-to-top,
  .theme-toggle,
  .menu-toggle,
  .search-form,
  .hero-dots {
    display: none !important;
  }

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

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