:root {
  --bg: #f8fafc;
  --bg-soft: #ffffff;
  --bg-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-strong: rgba(255, 255, 255, 0.88);
  --text: #0f172a;
  --text-soft: #475569;
  --text-muted: #64748b;
  --border: rgba(15, 23, 42, 0.08);
  --border-strong: rgba(15, 23, 42, 0.14);
  --primary: #f97316;
  --primary-soft: #fb923c;
  --primary-deep: #ea580c;
  --accent: #38bdf8;
  --accent-deep: #0ea5e9;
  --navy: #0f172a;
  --navy-soft: #1e293b;
  --success: #22c55e;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 12px 32px rgba(15, 23, 42, 0.1);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.14);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 45%, #ea580c 100%);
  --gradient-accent: linear-gradient(135deg, #f97316 0%, #fb923c 50%, #38bdf8 100%);
  --gradient-soft: linear-gradient(135deg, rgba(249, 115, 22, 0.12), rgba(56, 189, 248, 0.12));
  --header-h: 72px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

html[data-theme="dark"] {
  --bg: #0b1120;
  --bg-soft: #0f172a;
  --bg-elevated: #16213a;
  --bg-glass: rgba(22, 33, 58, 0.72);
  --bg-glass-strong: rgba(22, 33, 58, 0.9);
  --text: #e2e8f0;
  --text-soft: #cbd5e1;
  --text-muted: #94a3b8;
  --border: rgba(226, 232, 240, 0.1);
  --border-strong: rgba(226, 232, 240, 0.18);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.6);
  --gradient-hero: linear-gradient(135deg, #0b1120 0%, #1e293b 45%, #9a3412 100%);
  --gradient-soft: linear-gradient(135deg, rgba(249, 115, 22, 0.18), rgba(56, 189, 248, 0.16));
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --bg: #0b1120;
    --bg-soft: #0f172a;
    --bg-elevated: #16213a;
    --bg-glass: rgba(22, 33, 58, 0.72);
    --bg-glass-strong: rgba(22, 33, 58, 0.9);
    --text: #e2e8f0;
    --text-soft: #cbd5e1;
    --text-muted: #94a3b8;
    --border: rgba(226, 232, 240, 0.1);
    --border-strong: rgba(226, 232, 240, 0.18);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.6);
    --gradient-hero: linear-gradient(135deg, #0b1120 0%, #1e293b 45%, #9a3412 100%);
    --gradient-soft: linear-gradient(135deg, rgba(249, 115, 22, 0.18), rgba(56, 189, 248, 0.16));
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(circle at 12% 4%, rgba(249, 115, 22, 0.1), transparent 42%),
    radial-gradient(circle at 88% 12%, rgba(56, 189, 248, 0.1), transparent 40%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(249, 115, 22, 0.5);
  outline-offset: 3px;
  border-radius: 6px;
}

ul,
ol {
  padding-left: 1.25em;
}

h1, h2, h3, h4 {
  line-height: 1.3;
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2.2vw, 1.4rem); }

p { color: var(--text-soft); }

.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: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), box-shadow var(--transition);
}

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

.header-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 20px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--text);
  flex-shrink: 0;
}

.logo svg {
  border-radius: 10px;
  transition: transform var(--transition);
}

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

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

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

#main-nav > ul {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}

#main-nav > ul::-webkit-scrollbar { display: none; }

#main-nav a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-soft);
  white-space: nowrap;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

#main-nav a:hover {
  background: var(--gradient-soft);
  color: var(--primary-deep);
  transform: translateY(-1px);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.site-search {
  display: flex;
  align-items: center;
  background: var(--bg-glass-strong);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 4px 4px 4px 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.15);
}

.site-search input {
  border: 0;
  background: transparent;
  color: var(--text);
  font-size: 0.88rem;
  width: 150px;
  padding: 6px 4px;
  font-family: inherit;
}

.site-search input::placeholder { color: var(--text-muted); }
.site-search input:focus { outline: none; }

.site-search button {
  border: 0;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-accent);
  padding: 7px 16px;
  border-radius: 999px;
  transition: transform var(--transition), filter var(--transition);
}

.site-search button:hover { transform: scale(1.05); filter: brightness(1.08); }

#theme-toggle,
#menu-toggle {
  cursor: pointer;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-soft);
  background: var(--bg-glass-strong);
  border: 1px solid var(--border-strong);
  padding: 9px 14px;
  border-radius: 999px;
  transition: all var(--transition);
  white-space: nowrap;
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: var(--primary-deep);
  border-color: var(--primary);
  transform: translateY(-1px);
}

#menu-toggle { display: none; }

/* ============ Main & Sections ============ */
main {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

section {
  margin: 56px 0;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

section > h2 {
  position: relative;
  padding-left: 18px;
  margin-bottom: 20px;
}

section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: 999px;
  background: var(--gradient-accent);
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  margin: 24px 0 8px;
  font-size: 0.85rem;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--text-muted);
}

.breadcrumb li { display: inline-flex; align-items: center; gap: 6px; }

.breadcrumb li + li::before {
  content: "›";
  color: var(--text-muted);
  opacity: 0.6;
}

.breadcrumb a { color: var(--text-soft); font-weight: 600; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb [aria-current="page"] { color: var(--primary-deep); font-weight: 700; }

/* ============ Hero ============ */
#hero {
  margin-top: 24px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--gradient-hero);
  box-shadow: var(--shadow-lg);
  position: relative;
  isolation: isolate;
}

#hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(249, 115, 22, 0.35), transparent 55%),
    radial-gradient(circle at 80% 80%, rgba(56, 189, 248, 0.25), transparent 55%);
  z-index: -1;
  pointer-events: none;
}

.hero-slider {
  position: relative;
  display: flex;
  overflow: hidden;
  scroll-snap-type: x mandatory;
  background: rgba(15, 23, 42, 0.35);
}

.hero-slider .slide {
  flex: 0 0 100%;
  min-width: 100%;
  scroll-snap-align: start;
  position: relative;
  display: flex;
  flex-direction: column;
  animation: fadeSlide 12s infinite;
}

.hero-slider .slide:nth-child(2) { animation-delay: 4s; }
.hero-slider .slide:nth-child(3) { animation-delay: 8s; }

@keyframes fadeSlide {
  0%, 30% { opacity: 1; }
  33%, 97% { opacity: 0; }
  100% { opacity: 1; }
}

.hero-img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  display: block;
}

.slide-text {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 32px clamp(20px, 5vw, 48px);
  background: linear-gradient(to top, rgba(15, 23, 42, 0.92), rgba(15, 23, 42, 0.4) 60%, transparent);
  color: #fff;
}

.slide-text h2 {
  color: #fff;
  margin: 0 0 8px;
  font-size: clamp(1.2rem, 3vw, 1.9rem);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.slide-text p {
  color: rgba(241, 245, 249, 0.92);
  margin: 0;
  max-width: 640px;
  font-size: clamp(0.85rem, 1.6vw, 1rem);
}

.slider-prev,
.slider-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: #fff;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: all var(--transition);
  z-index: 3;
}

.slider-prev { left: 16px; }
.slider-next { right: 16px; }

.slider-prev:hover,
.slider-next:hover {
  background: var(--primary);
  border-color: var(--primary);
  transform: translateY(-50%) scale(1.1);
}

.hero-intro {
  padding: clamp(24px, 5vw, 48px);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-intro h1 {
  margin-top: 0;
  margin-bottom: 16px;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--primary);
  line-height: 1.25;
}

.hero-intro > p {
  max-width: 900px;
  color: var(--text-soft);
  font-size: clamp(0.92rem, 1.6vw, 1.02rem);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.stat {
  padding: 20px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-glass-strong);
  border: 1px solid var(--border);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

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

.stat-num {
  display: block;
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  font-weight: 900;
  line-height: 1.1;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* ============ Anchor Nav ============ */
.anchor-nav {
  position: sticky;
  top: var(--header-h);
  z-index: 900;
  margin: 20px 0 0;
  padding: 10px;
  border-radius: var(--radius-md);
  background: var(--bg-glass-strong);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.anchor-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.anchor-nav a {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-soft);
  background: transparent;
  transition: all var(--transition);
}

.anchor-nav a:hover {
  background: var(--gradient-accent);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(249, 115, 22, 0.28);
}

/* ============ Cards & Content ============ */
#about,
#history,
#culture,
#videos,
#advantages,
#services,
#scenes,
#solutions,
#cases,
#reviews,
#news,
#articles,
#knowledge,
#howto,
#faq,
#contact,
#sitemap,
#links {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 4vw, 44px);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition);
}

#about:hover,
#videos:hover,
#services:hover,
#cases:hover,
#articles:hover,
#faq:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

#about ul,
#culture ul,
#howto ul,
#howto ol,
#contact address ul,
#sitemap ul,
#links ul,
#news ul {
  padding-left: 1.2em;
}

#about li,
#culture li,
#howto li,
#contact li,
#sitemap li,
#links li {
  margin: 6px 0;
  color: var(--text-soft);
}

#about h3,
#culture h3,
#services h3,
#scenes h3,
#solutions h3,
#advantages h3,
#knowledge h3,
#howto h3 {
  margin-top: 32px;
  margin-bottom: 12px;
  padding-left: 14px;
  position: relative;
}

#about h3::before,
#culture h3::before,
#services h3::before,
#scenes h3::before,
#solutions h3::before,
#advantages h3::before,
#knowledge h3::before,
#howto h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.25em;
  bottom: 0.25em;
  width: 4px;
  border-radius: 999px;
  background: var(--gradient-accent);
}

/* ============ Timeline ============ */
.timeline {
  list-style: none;
  margin: 24px 0 0;
  padding: 0 0 0 28px;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(to bottom, var(--primary), var(--accent));
  opacity: 0.5;
}

.timeline li {
  position: relative;
  margin: 0 0 22px;
  padding: 18px 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 24px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gradient-accent);
  box-shadow: 0 0 0 4px var(--bg-elevated), 0 0 0 6px rgba(249, 115, 22, 0.25);
}

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

.timeline li h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

.timeline li p {
  margin: 0;
  font-size: 0.94rem;
}

/* ============ Video Category Cards ============ */
.video-category {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 24px;
  align-items: center;
  margin: 24px 0;
  padding: 20px;
  border-radius: var(--radius-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.video-category:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(249, 115, 22, 0.4);
}

.video-category svg {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}

.video-category:hover svg {
  transform: scale(1.02);
}

.video-category h3 {
  margin-top: 0;
  margin-bottom: 10px;
  padding-left: 0;
}

.video-category h3::before { display: none; }

.video-category:nth-child(even) {
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
}

.video-category:nth-child(even) svg { order: 2; }

/* ============ Cases ============ */
.case {
  padding: 22px;
  margin: 18px 0;
  border-radius: var(--radius-md);
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.case:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.case h3 {
  margin-top: 0;
  margin-bottom: 8px;
  color: var(--primary-deep);
}

.case p { margin: 0; }

/* ============ Reviews ============ */
#reviews blockquote {
  position: relative;
  margin: 18px 0;
  padding: 24px 24px 24px 56px;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  transition: transform var(--transition), box-shadow var(--transition);
}

#reviews blockquote::before {
  content: "“";
  position: absolute;
  left: 16px;
  top: 6px;
  font-size: 3.2rem;
  line-height: 1;
  font-family: Georgia, serif;
  color: var(--primary);
  opacity: 0.5;
}

#reviews blockquote:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

#reviews blockquote p {
  margin: 0 0 10px;
  font-size: 1rem;
  color: var(--text);
  font-style: italic;
}

#reviews blockquote footer {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-muted);
}

/* ============ News ============ */
.news-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.news-list li {
  padding: 18px 0;
  border-bottom: 1px dashed var(--border-strong);
  transition: padding var(--transition);
}

.news-list li:last-child { border-bottom: 0; }

.news-list li:hover { padding-left: 8px; }

.news-list h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

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

.news-list p {
  margin: 0 0 4px;
  font-size: 0.9rem;
}

.news-list p:first-of-type {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* ============ Posts ============ */
.post {
  padding: 22px;
  margin: 18px 0;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.post:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.post h3 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1.1rem;
}

.post h3 a { color: var(--text); }
.post h3 a:hover { color: var(--primary); }

.post .meta {
  margin: 0 0 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.post > p:not(.meta) {
  margin: 0 0 14px;
  font-size: 0.94rem;
}

.read-more {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-accent);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.read-more:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(249, 115, 22, 0.35);
  filter: brightness(1.06);
}

/* ============ FAQ ============ */
#faq details {
  margin: 12px 0;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

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

#faq summary {
  cursor: pointer;
  padding: 16px 20px;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text);
  list-style: none;
  position: relative;
  padding-right: 48px;
  transition: background var(--transition), color var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform var(--transition);
}

#faq details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

#faq summary:hover {
  background: var(--gradient-soft);
  color: var(--primary-deep);
}

#faq details p {
  margin: 0;
  padding: 0 20px 18px;
  font-size: 0.94rem;
  color: var(--text-soft);
  animation: fadeIn 0.35s ease;
}

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

/* ============ Contact ============ */
#contact address {
  font-style: normal;
  margin: 16px 0;
  padding: 20px;
  border-radius: var(--radius-md);
  background: var(--gradient-soft);
  border: 1px solid var(--border);
}

#contact address ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

#contact address li {
  padding-left: 22px;
  position: relative;
  font-size: 0.94rem;
}

#contact address li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-accent);
}

/* ============ Sitemap & Links ============ */
#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 8px;
}

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

#sitemap a,
#links a {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-soft);
  background: var(--bg-glass);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: var(--gradient-accent);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(249, 115, 22, 0.28);
}

/* ============ Footer ============ */
#site-footer {
  background: var(--navy);
  color: #cbd5e1;
  padding: 56px 24px 32px;
  margin-top: 40px;
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 10%, rgba(249, 115, 22, 0.18), transparent 45%),
    radial-gradient(circle at 85% 90%, rgba(56, 189, 248, 0.15), transparent 45%);
  pointer-events: none;
}

#site-footer > * {
  position: relative;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
}

.footer-meta p {
  margin: 6px 0;
  font-size: 0.85rem;
  color: #94a3b8;
}

#site-footer nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  list-style: none;
  padding: 0;
  margin: 20px auto;
}

#site-footer nav a {
  font-size: 0.88rem;
  font-weight: 600;
  color: #cbd5e1;
  transition: color var(--transition);
}

#site-footer nav a:hover { color: var(--primary-soft); }

#site-footer section {
  margin: 24px auto 0;
  padding: 20px 22px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#site-footer section h2 {
  font-size: 1rem;
  margin: 0 0 8px;
  color: #e2e8f0;
}

#site-footer section p {
  margin: 0;
  font-size: 0.86rem;
  color: #94a3b8;
}

/* ============ Back to top ============ */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 950;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-accent);
  border: 0;
  padding: 12px 18px;
  border-radius: 999px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all var(--transition);
}

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

#back-to-top:hover {
  filter: brightness(1.08);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* ============ Scroll reveal ============ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

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

/* ============ Responsive ============ */
@media (max-width: 1080px) {
  .site-search input { width: 110px; }
  #main-nav a { padding: 8px 9px; font-size: 0.86rem; }
}

@media (max-width: 900px) {
  :root { --header-h: 64px; }

  .header-inner {
    padding: 0 16px;
    gap: 12px;
    flex-wrap: wrap;
    height: auto;
    min-height: var(--header-h);
    padding-top: 10px;
    padding-bottom: 10px;
  }

  #menu-toggle { display: inline-block; }

  #main-nav {
    order: 3;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }

  #main-nav.is-open { max-height: 480px; }

  #main-nav > ul {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 8px 0;
    overflow: visible;
  }

  #main-nav a {
    display: block;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
  }

  .header-actions { margin-left: auto; }

  .site-search { display: none; }

  main { padding: 0 16px 64px; }

  section { margin: 40px 0; }

  .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .video-category,
  .video-category:nth-child(even) {
    grid-template-columns: 1fr;
  }

  .video-category:nth-child(even) svg { order: 0; }

  .anchor-nav {
    top: var(--header-h);
    padding: 8px;
  }

  .anchor-nav ul { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
  .anchor-nav ul::-webkit-scrollbar { display: none; }
  .anchor-nav a { white-space: nowrap; }
}

@media (max-width: 600px) {
  body { font-size: 15px; }

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

  #theme-toggle { padding: 8px 12px; font-size: 0.76rem; }
  #menu-toggle { padding: 8px 12px; font-size: 0.76rem; }

  #hero { border-radius: var(--radius-lg); }

  .hero-img { aspect-ratio: 4 / 3; }

  .slide-text { padding: 20px; }

  .slider-prev,
  .slider-next {
    width: 36px;
    height: 36px;
    font-size: 1.2rem;
  }

  .slider-prev { left: 8px; }
  .slider-next { right: 8px; }

  .hero-intro { padding: 22px 18px; }

  .hero-stats { gap: 10px; }

  .stat { padding: 14px 10px; }

  .stat-label { font-size: 0.74rem; }

  #about,
  #history,
  #culture,
  #videos,
  #advantages,
  #services,
  #scenes,
  #solutions,
  #cases,
  #reviews,
  #news,
  #articles,
  #knowledge,
  #howto,
  #faq,
  #contact,
  #sitemap,
  #links {
    padding: 20px 16px;
    border-radius: var(--radius-md);
  }

  .timeline { padding-left: 22px; }
  .timeline li::before { left: -22px; width: 12px; height: 12px; }

  #reviews blockquote { padding: 20px 16px 20px 44px; }
  #reviews blockquote::before { left: 10px; font-size: 2.4rem; }

  #sitemap ul,
  #links ul { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  #back-to-top {
    right: 14px;
    bottom: 14px;
    padding: 10px 14px;
    font-size: 0.74rem;
  }

  #site-footer { padding: 40px 16px 24px; }
}

@media (max-width: 380px) {
  .hero-stats { grid-template-columns: 1fr; }
  #sitemap ul,
  #links ul { grid-template-columns: 1fr; }
}

/* ============ Motion & print ============ */
@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;
  }
  .reveal { opacity: 1; transform: none; }
  .hero-slider .slide { animation: none; opacity: 1; }
}

@media print {
  #site-header,
  .anchor-nav,
  #back-to-top,
  .slider-prev,
  .slider-next,
  #site-footer nav {
    display: none !important;
  }
  body { background: #fff; color: #000; }
  a { color: #000; text-decoration: underline; }
  section { break-inside: avoid; box-shadow: none; border: 1px solid #ddd; }
}