:root {
  --primary: #6C3CE1;
  --primary-light: #8B5CF6;
  --primary-dark: #4C2AB0;
  --accent: #FFD166;
  --accent-dark: #F0B429;
  --gradient-start: #6C3CE1;
  --gradient-mid: #9B5DE5;
  --gradient-end: #F15BB5;
  --bg: #FAFAFE;
  --bg-alt: #F3EEFF;
  --surface: #FFFFFF;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --surface-glass-border: rgba(255, 255, 255, 0.45);
  --text: #1A1A2E;
  --text-secondary: #4A4A6A;
  --text-muted: #7A7A9A;
  --border: #E4DEF5;
  --shadow-sm: 0 2px 8px rgba(108, 60, 225, 0.08);
  --shadow: 0 8px 30px rgba(108, 60, 225, 0.12);
  --shadow-lg: 0 20px 60px rgba(108, 60, 225, 0.18);
  --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);
  --header-height: 72px;
  --max-width: 1200px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

[data-theme="dark"] {
  --primary: #8B5CF6;
  --primary-light: #A78BFA;
  --primary-dark: #6C3CE1;
  --accent: #FFD166;
  --accent-dark: #F0B429;
  --bg: #0F0A1E;
  --bg-alt: #1A1030;
  --surface: #1E1436;
  --surface-glass: rgba(30, 20, 54, 0.72);
  --surface-glass-border: rgba(139, 92, 246, 0.25);
  --text: #F0EDF8;
  --text-secondary: #C4BCE0;
  --text-muted: #8A82A8;
  --border: #2E2450;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text);
  transition: color var(--transition);
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
  position: relative;
  padding-bottom: 0.75rem;
}

h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

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

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

blockquote {
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--bg-alt);
  font-style: italic;
  color: var(--text-secondary);
}

blockquote p {
  margin-bottom: 0;
}

time {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

/* ===== Header ===== */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  height: var(--header-height);
  background: var(--surface-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--surface-glass-border);
  transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
}

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

.header-inner {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

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

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

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

.logo:hover svg {
  transform: rotate(-6deg) scale(1.05);
}

.logo-text {
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

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

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

#main-nav a {
  display: block;
  padding: 8px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  position: relative;
  transition: color var(--transition), background var(--transition);
}

#main-nav a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  border-radius: 1px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  transform: translateX(-50%);
  transition: width var(--transition);
}

#main-nav a:hover {
  color: var(--primary);
  background: var(--bg-alt);
}

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

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

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

#site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(108, 60, 225, 0.15);
}

#site-search input {
  width: 160px;
  padding: 8px 14px;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: 0.85rem;
  font-family: inherit;
}

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

#site-search button {
  padding: 8px 16px;
  border: none;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: opacity var(--transition), transform var(--transition);
}

#site-search button:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

#theme-toggle,
#mobile-menu-btn {
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  transition: all var(--transition);
}

#theme-toggle:hover,
#mobile-menu-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--bg-alt);
  transform: translateY(-1px);
}

#mobile-menu-btn {
  display: none;
}

/* ===== Main ===== */
#main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 60px;
}

section {
  padding: 48px 0;
  animation: fadeInUp 0.7s ease both;
}

section:nth-child(even) {
  animation-delay: 0.05s;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Breadcrumb ===== */
#breadcrumb {
  padding: 20px 0 0;
  animation: none;
}

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

#breadcrumb li {
  display: flex;
  align-items: center;
}

#breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: var(--text-muted);
  opacity: 0.5;
}

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

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

#breadcrumb [aria-current="page"] {
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===== Hero ===== */
#hero {
  position: relative;
  padding: 56px 40px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-mid) 50%, var(--gradient-end) 100%);
  background-size: 200% 200%;
  animation: gradientShift 12s ease infinite, fadeInUp 0.7s ease both;
  overflow: hidden;
  color: #fff;
  box-shadow: var(--shadow-lg);
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

#hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 209, 102, 0.25), transparent 70%);
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.15), transparent 70%);
  pointer-events: none;
}

#hero h1 {
  position: relative;
  z-index: 1;
  color: #fff;
  margin-bottom: 1.25rem;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
}

#hero > p {
  position: relative;
  z-index: 1;
  max-width: 800px;
  color: rgba(255, 255, 255, 0.92);
  font-size: 1.02rem;
  line-height: 1.85;
}

#hero figure {
  position: relative;
  z-index: 1;
  margin: 2rem 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition-slow);
}

#hero figure:hover {
  transform: translateY(-4px) scale(1.005);
}

#hero figcaption {
  padding: 12px 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  background: var(--surface);
}

.hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 2rem;
}

.hero-stats > div {
  padding: 20px 16px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  text-align: center;
  transition: transform var(--transition), background var(--transition);
}

.hero-stats > div:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.25);
}

.hero-stats strong {
  display: block;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}

.hero-stats span {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.85);
}

/* ===== Carousel ===== */
#banner-carousel .carousel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 1.5rem;
}

#banner-carousel .slide {
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

#banner-carousel .slide::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

#banner-carousel .slide:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

#banner-carousel .slide:hover::before {
  transform: scaleX(1);
}

#banner-carousel .slide h3 {
  margin-top: 0;
  color: var(--primary);
}

#banner-carousel .slide p {
  margin-bottom: 0;
  font-size: 0.92rem;
}

/* ===== Content Cards ===== */
#brand,
#products,
#solutions,
#scenes,
#cases,
#news,
#articles,
#industry,
#faq,
#howto,
#contact,
#author-info,
#sitemap,
#friend-links,
#legal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-top: 32px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

#brand h3,
#products h3,
#solutions h3,
#scenes h3,
#cases h3,
#industry h3,
#howto h3,
#contact h3 {
  color: var(--primary);
  padding-left: 14px;
  border-left: 4px solid var(--accent);
}

#brand ul {
  display: grid;
  gap: 10px;
  margin: 1rem 0;
}

#brand ul li {
  padding: 12px 18px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border-left: 3px solid var(--primary);
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: transform var(--transition), background var(--transition);
}

#brand ul li:hover {
  transform: translateX(6px);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

#products ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin: 1.25rem 0;
}

#products ul li {
  padding: 16px 18px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  font-size: 0.92rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: 42px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#products ul li::before {
  content: "✓";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
}

#products ul li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--primary-light);
}

/* ===== News & Articles ===== */
#news article,
#articles article {
  padding: 24px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  margin-bottom: 16px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
}

#news article:hover,
#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  background: var(--surface);
  border-color: var(--primary-light);
}

#news article h3,
#articles article h3 {
  margin-top: 0;
  font-size: 1.1rem;
  color: var(--text);
  transition: color var(--transition);
}

#news article:hover h3,
#articles article:hover h3 {
  color: var(--primary);
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
}

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

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

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

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

#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);
}

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

#faq summary::after {
  content: "+";
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  color: #fff;
  font-size: 1.1rem;
  font-weight: 400;
  line-height: 1;
  transition: transform var(--transition);
}

#faq details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

#faq summary:hover {
  color: var(--primary);
}

#faq details p {
  padding: 0 24px 20px;
  margin-bottom: 0;
  font-size: 0.95rem;
  animation: fadeIn 0.3s ease;
}

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

/* ===== HowTo ===== */
#howto ol {
  counter-reset: step;
  display: grid;
  gap: 12px;
  margin: 1.25rem 0;
}

#howto ol li {
  counter-increment: step;
  padding: 16px 20px 16px 60px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  position: relative;
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
  border-color: var(--primary-light);
}

#howto ul {
  display: grid;
  gap: 8px;
  margin: 1rem 0;
}

#howto ul li {
  padding: 10px 16px 10px 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-alt);
  position: relative;
  font-size: 0.92rem;
  color: var(--text-secondary);
  transition: background var(--transition), transform var(--transition);
}

#howto ul li::before {
  content: "▸";
  position: absolute;
  left: 14px;
  color: var(--primary);
  font-weight: 700;
}

#howto ul li:hover {
  background: var(--surface);
  transform: translateX(4px);
}

/* ===== Contact ===== */
#contact ul {
  display: grid;
  gap: 10px;
  margin: 1rem 0;
}

#contact ul li {
  padding: 14px 20px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

#contact ul li:hover {
  transform: translateY(-3px);
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
}

/* ===== Sitemap & Friend Links ===== */
#sitemap ul,
#friend-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 1rem;
}

#sitemap ul li a,
#friend-links ul li a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: all var(--transition);
}

#sitemap ul li a:hover,
#friend-links ul li a:hover {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

/* ===== Legal ===== */
#legal h2 {
  font-size: 1.25rem;
}

#legal h2::after {
  width: 40px;
  height: 3px;
}

#legal p {
  font-size: 0.92rem;
}

/* ===== Footer ===== */
#site-footer {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--gradient-end) 100%);
  color: rgba(255, 255, 255, 0.9);
  padding: 48px 24px;
  margin-top: 40px;
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 209, 102, 0.15), transparent 70%);
  pointer-events: none;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.footer-inner p {
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.footer-inner p:first-child {
  font-weight: 600;
  color: #fff;
}

.footer-inner a {
  color: var(--accent);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  border-radius: 999px;
  border: 1px solid rgba(255, 209, 102, 0.4);
  transition: all var(--transition);
}

.footer-inner a:hover {
  background: var(--accent);
  color: var(--primary-dark);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ===== Back to Top ===== */
#back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 900;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  font-size: 0;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
  transition: all var(--transition);
}

#back-to-top::before {
  content: "↑";
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1;
}

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

#back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 20px 50px rgba(108, 60, 225, 0.4);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  #main-nav a {
    padding: 8px 8px;
    font-size: 0.82rem;
  }

  #site-search input {
    width: 120px;
  }
}

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

  #main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--surface-glass);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--surface-glass-border);
    padding: 16px 24px;
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
  }

  #main-nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  #main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  #main-nav a {
    padding: 12px 16px;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
  }

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

  #site-search {
    display: none;
  }

  #mobile-menu-btn {
    display: block;
  }

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

  #main-content {
    padding: 0 16px 40px;
  }

  #hero {
    padding: 36px 24px;
    border-radius: var(--radius-lg);
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  #brand,
  #products,
  #solutions,
  #scenes,
  #cases,
  #news,
  #articles,
  #industry,
  #faq,
  #howto,
  #contact,
  #author-info,
  #sitemap,
  #friend-links,
  #legal {
    padding: 28px 20px;
    border-radius: var(--radius);
    margin-top: 24px;
  }

  section {
    padding: 32px 0;
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 46px;
    height: 46px;
  }
}

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

  #hero {
    padding: 28px 18px;
  }

  #hero h1 {
    font-size: 1.5rem;
  }

  #hero > p {
    font-size: 0.92rem;
  }

  #hero figure {
    margin: 1.5rem 0;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 1.5rem;
  }

  .hero-stats > div {
    padding: 14px 10px;
  }

  .hero-stats strong {
    font-size: 1.25rem;
  }

  .hero-stats span {
    font-size: 0.72rem;
  }

  #banner-carousel .carousel {
    grid-template-columns: 1fr;
  }

  #products ul {
    grid-template-columns: 1fr;
  }

  #news article,
  #articles article {
    padding: 18px;
  }

  #faq summary {
    padding: 14px 18px;
    font-size: 0.92rem;
  }

  #faq details p {
    padding: 0 18px 16px;
    font-size: 0.88rem;
  }

  #howto ol li {
    padding: 14px 16px 14px 52px;
    font-size: 0.88rem;
  }

  #howto ol li::before {
    width: 26px;
    height: 26px;
    left: 14px;
    font-size: 0.78rem;
  }

  #sitemap ul,
  #friend-links ul {
    gap: 8px;
  }

  #sitemap ul li a,
  #friend-links ul li a {
    padding: 6px 14px;
    font-size: 0.82rem;
  }

  #site-footer {
    padding: 36px 16px;
  }

  .footer-inner p {
    font-size: 0.82rem;
  }

  #back-to-top {
    bottom: 16px;
    right: 16px;
    width: 42px;
    height: 42px;
  }

  #back-to-top::before {
    font-size: 1.1rem;
  }
}

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

  #theme-toggle {
    padding: 8px 10px;
    font-size: 0.75rem;
  }

  #mobile-menu-btn {
    padding: 8px 10px;
    font-size: 0.75rem;
  }
}

/* ===== Accessibility & 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;
  }
}

::selection {
  background: var(--primary);
  color: #fff;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 999px;
  border: 2px solid var(--bg-alt);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

/* ===== Scroll Animation Classes ===== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }