:root {
  --primary: #e94560;
  --primary-dark: #c72c48;
  --primary-light: #ff6b81;
  --secondary: #0f3460;
  --accent: #533483;
  --accent-2: #1a1a2e;
  --bg: #f5f6fa;
  --bg-alt: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-strong: rgba(255, 255, 255, 0.88);
  --text: #1a1a2e;
  --text-soft: #4a4a5e;
  --text-muted: #7a7a8e;
  --border: rgba(26, 26, 46, 0.1);
  --border-strong: rgba(26, 26, 46, 0.18);
  --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, 0.16);
  --shadow-glow: 0 8px 32px rgba(233, 69, 96, 0.32);
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 35%, #0f3460 70%, #533483 100%);
  --gradient-primary: linear-gradient(135deg, #e94560 0%, #533483 100%);
  --gradient-accent: linear-gradient(120deg, #e94560 0%, #ff6b81 50%, #533483 100%);
  --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(245, 246, 250, 0.7));
  --gradient-dark-card: linear-gradient(145deg, rgba(30, 30, 52, 0.9), rgba(22, 33, 62, 0.7));
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --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;
}

[data-theme="dark"] {
  --bg: #0d0d1a;
  --bg-alt: #16162a;
  --bg-glass: rgba(22, 22, 42, 0.72);
  --bg-glass-strong: rgba(22, 22, 42, 0.9);
  --text: #eef0f8;
  --text-soft: #b8bcd0;
  --text-muted: #8286a0;
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.18);
  --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);
  --gradient-card: linear-gradient(145deg, rgba(30, 30, 52, 0.9), rgba(22, 33, 62, 0.7));
  --gradient-hero: linear-gradient(135deg, #0d0d1a 0%, #16213e 40%, #1a1a2e 70%, #2a1a4e 100%);
}

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

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

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

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

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

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: clamp(1.9rem, 5vw, 3.2rem);
}

h2 {
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  margin-bottom: 1.2rem;
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 1.1em;
  border-radius: 3px;
  background: var(--gradient-primary);
}

h3 {
  font-size: clamp(1.15rem, 2.4vw, 1.4rem);
  margin: 1.6rem 0 0.7rem;
  color: var(--text);
}

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

section {
  padding: clamp(2.4rem, 6vw, 4.5rem) clamp(1rem, 4vw, 2rem);
  max-width: 1240px;
  margin: 0 auto;
}

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

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

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary), var(--accent));
  border-radius: 10px;
  border: 2px solid var(--bg);
}

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

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

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

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 6px clamp(1rem, 4vw, 2rem);
  font-size: 0.78rem;
  color: #eef0f8;
  background: var(--gradient-hero);
  letter-spacing: 0.02em;
  flex-wrap: wrap;
}

.topbar span {
  opacity: 0.92;
}

nav {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 0.6rem clamp(1rem, 4vw, 2rem);
  max-width: 1400px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
}

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

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

.logo strong {
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--text);
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex-wrap: wrap;
  flex: 1;
  justify-content: center;
}

.nav-links a {
  display: inline-block;
  padding: 0.42rem 0.72rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: 999px;
  position: relative;
  white-space: nowrap;
  transition: color var(--transition), background var(--transition);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-primary);
  transition: transform var(--transition);
}

.nav-links a:hover {
  color: var(--primary);
  background: rgba(233, 69, 96, 0.08);
}

.nav-links a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-tools {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

#site-search {
  width: 180px;
  padding: 0.5rem 0.9rem;
  font-size: 0.85rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-alt);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  outline: none;
  transition: width var(--transition), border-color var(--transition), box-shadow var(--transition);
}

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

#site-search:focus {
  width: 220px;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.15);
}

#dark-toggle,
#menu-toggle {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  font-size: 1.05rem;
  color: var(--text);
  background: var(--bg-alt);
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

#dark-toggle:hover,
#menu-toggle:hover {
  transform: scale(1.1) rotate(8deg);
  border-color: var(--primary);
  background: rgba(233, 69, 96, 0.1);
}

#menu-toggle {
  display: none;
}

/* ===== Hero ===== */
#hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: center;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  padding-top: clamp(2rem, 5vw, 4rem);
  padding-bottom: clamp(2rem, 5vw, 4rem);
  position: relative;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(circle at 20% 20%, rgba(233, 69, 96, 0.12), transparent 55%),
              radial-gradient(circle at 85% 75%, rgba(83, 52, 131, 0.16), transparent 55%);
  border-radius: var(--radius-xl);
  pointer-events: none;
}

.hero-text h1 {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin-bottom: 0.9rem;
  animation: fadeUp 0.8s ease both;
}

.hero-sub {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.9rem;
  animation: fadeUp 0.8s 0.1s ease both;
}

.hero-desc {
  font-size: 0.96rem;
  color: var(--text-soft);
  margin-bottom: 1.6rem;
  animation: fadeUp 0.8s 0.2s ease both;
}

.hero-actions {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
  animation: fadeUp 0.8s 0.3s ease both;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.9rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 999px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.btn-primary {
  color: #fff;
  background: var(--gradient-primary);
  box-shadow: var(--shadow-glow);
}

.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.35), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 14px 40px rgba(233, 69, 96, 0.45);
  color: #fff;
}

.btn-primary:hover::before {
  transform: translateX(100%);
}

.btn-secondary {
  color: var(--text);
  background: var(--bg-glass-strong);
  border: 1.5px solid var(--border-strong);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

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

/* ===== Carousel ===== */
.hero-banner {
  position: relative;
  animation: fadeUp 0.9s 0.2s ease both;
}

.carousel {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 600 / 320;
  background: var(--secondary);
}

.carousel .slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: scale(1.05);
  transition: opacity 0.7s ease, transform 0.7s ease;
  pointer-events: none;
}

.carousel .slide.active {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

.carousel .slide svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.carousel-dots {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 2;
}

.carousel-dots .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
  cursor: pointer;
  transition: width var(--transition), background var(--transition);
}

.carousel-dots .dot.active {
  width: 26px;
  border-radius: 999px;
  background: var(--primary);
}

/* ===== Stats ===== */
#stats {
  position: relative;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}

.stat {
  padding: 1.8rem 1.2rem;
  text-align: center;
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.stat::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.stat:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.stat:hover::after {
  transform: scaleX(1);
}

.stat .num {
  display: block;
  font-size: clamp(1.6rem, 3.4vw, 2.3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  line-height: 1.2;
}

.stat p {
  margin: 0.4rem 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== Content sections ===== */
#intro,
#product,
#scenes,
#cases,
#news,
#articles,
#knowledge,
#faq,
#howto,
#contact,
#sitemap {
  animation: fadeUp 0.7s ease both;
}

#intro p,
#product p,
#scenes p,
#cases p,
#knowledge p,
#howto p {
  font-size: 0.95rem;
}

#intro h3,
#product h3,
#scenes h3,
#cases h3,
#knowledge h3,
#howto h3 {
  position: relative;
  padding-left: 14px;
}

#intro h3::before,
#product h3::before,
#scenes h3::before,
#cases h3::before,
#knowledge h3::before,
#howto h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 4px;
  height: 0.9em;
  border-radius: 2px;
  background: var(--gradient-primary);
}

/* ===== Blockquote / cases ===== */
blockquote {
  margin: 1rem 0;
  padding: 1rem 1.4rem;
  font-size: 0.95rem;
  font-style: italic;
  color: var(--text-soft);
  background: var(--gradient-card);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

/* ===== News & Articles cards ===== */
#news article,
#articles article {
  padding: 1.5rem 1.6rem;
  margin-bottom: 1.2rem;
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

#news article::before,
#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-primary);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition-slow);
}

#news article:hover,
#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.4);
}

#news article:hover::before,
#articles article:hover::before {
  transform: scaleY(1);
}

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

#articles article h3 a {
  color: var(--text);
  transition: color var(--transition);
}

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

#news time,
.meta {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
  padding: 0.15rem 0.7rem;
  border-radius: 999px;
  background: rgba(233, 69, 96, 0.08);
}

#articles article > a:last-child {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.88rem;
  font-weight: 600;
  margin-top: 0.4rem;
  transition: gap var(--transition);
}

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

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

/* ===== FAQ ===== */
.faq-list {
  display: grid;
  gap: 0.8rem;
}

.faq-list details {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.faq-list details[open] {
  border-color: rgba(233, 69, 96, 0.45);
  box-shadow: var(--shadow-md);
}

.faq-list summary {
  padding: 1.05rem 1.4rem;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 3rem;
  transition: color var(--transition), background var(--transition);
}

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

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 1.3rem;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--primary);
  background: rgba(233, 69, 96, 0.1);
  border-radius: 50%;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

.faq-list details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
  color: #fff;
  background: var(--primary);
}

.faq-list summary:hover {
  color: var(--primary);
  background: rgba(233, 69, 96, 0.05);
}

.faq-list details p {
  margin: 0;
  padding: 0 1.4rem 1.2rem;
  font-size: 0.92rem;
  color: var(--text-soft);
  animation: fadeUp 0.4s ease both;
}

/* ===== HowTo ===== */
#howto ol {
  counter-reset: step;
  display: grid;
  gap: 0.7rem;
  margin: 1rem 0 1.4rem;
  padding: 0;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 0.9rem 1.2rem 0.9rem 3.4rem;
  font-size: 0.94rem;
  color: var(--text-soft);
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  transition: transform 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;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-primary);
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.35);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

/* ===== Contact ===== */
#contact ul {
  display: grid;
  gap: 0.6rem;
  margin: 1rem 0;
}

#contact ul li {
  position: relative;
  padding: 0.7rem 1rem 0.7rem 2.4rem;
  font-size: 0.93rem;
  color: var(--text-soft);
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: transform var(--transition), border-color var(--transition);
}

#contact ul li::before {
  content: "◆";
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.65rem;
  color: var(--primary);
}

#contact ul li:hover {
  transform: translateX(4px);
  border-color: var(--primary);
}

/* ===== Sitemap ===== */
.sitemap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.sitemap li a {
  display: inline-block;
  padding: 0.5rem 1.15rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-soft);
  background: var(--bg-glass-strong);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform var(--transition), color var(--transition), background var(--transition), border-color var(--transition);
}

.sitemap li a:hover {
  transform: translateY(-3px);
  color: #fff;
  background: var(--gradient-primary);
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}

/* ===== Footer ===== */
footer {
  margin-top: 2rem;
  color: #c8cce0;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.18), transparent 70%);
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 2rem;
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1rem, 4vw, 2rem) 1.5rem;
  position: relative;
}

.footer-grid h3 {
  font-size: 1rem;
  color: #fff;
  margin: 0 0 0.9rem;
  position: relative;
  padding-bottom: 0.55rem;
}

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

.footer-grid p,
.footer-grid li {
  font-size: 0.85rem;
  color: #a8adc8;
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.footer-grid a {
  color: #a8adc8;
  transition: color var(--transition), padding-left var(--transition);
}

.footer-grid a:hover {
  color: var(--primary-light);
  padding-left: 4px;
}

.footer-bottom {
  max-width: 1240px;
  margin: 0 auto;
  padding: 1.4rem clamp(1rem, 4vw, 2rem) 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
}

.footer-bottom p {
  font-size: 0.78rem;
  color: #8a8fb0;
  margin-bottom: 0.45rem;
  line-height: 1.7;
}

/* ===== Back to top ===== */
#back-to-top {
  position: fixed;
  right: 1.4rem;
  bottom: 1.4rem;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-primary);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.85);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
  z-index: 900;
}

#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 14px 40px rgba(233, 69, 96, 0.5);
}

/* ===== Animations ===== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(233, 69, 96, 0.4); }
  50% { box-shadow: 0 0 0 12px rgba(233, 69, 96, 0); }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

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

.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }

@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;
  }
}

/* ===== Responsive ===== */
@media (max-width: 1080px) {
  .nav-links {
    gap: 0;
  }
  .nav-links a {
    padding: 0.4rem 0.55rem;
    font-size: 0.83rem;
  }
  #site-search {
    width: 150px;
  }
  #site-search:focus {
    width: 180px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 900px) {
  #hero {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-text h1,
  .hero-sub,
  .hero-desc {
    text-align: center;
  }
  .hero-banner {
    order: -1;
    max-width: 640px;
    margin: 0 auto;
    width: 100%;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  .topbar {
    justify-content: center;
    text-align: center;
    font-size: 0.72rem;
    gap: 0.25rem;
    padding: 5px 1rem;
  }
  .topbar span:last-child {
    display: none;
  }
  nav {
    flex-wrap: wrap;
    gap: 0.6rem;
    padding: 0.55rem 1rem;
  }
  .logo strong {
    font-size: 0.9rem;
  }
  #menu-toggle {
    display: grid;
  }
  .nav-links {
    display: none;
    order: 10;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
    padding: 0.6rem 0;
    border-top: 1px solid var(--border);
    animation: fadeIn 0.3s ease both;
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links a {
    padding: 0.65rem 0.9rem;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
  }
  .nav-links a::after {
    display: none;
  }
  .nav-tools {
    margin-left: auto;
  }
  #site-search {
    width: 130px;
    font-size: 0.8rem;
    padding: 0.42rem 0.75rem;
  }
  #site-search:focus {
    width: 150px;
  }
  section {
    padding: 2rem 1rem;
  }
  h2 {
    padding-left: 14px;
    margin-bottom: 1rem;
  }
  h2::before {
    width: 5px;
  }
  .stats-grid {
    gap: 0.8rem;
  }
  .stat {
    padding: 1.3rem 0.8rem;
  }
  .faq-list summary {
    padding: 0.9rem 2.8rem 0.9rem 1.1rem;
    font-size: 0.92rem;
  }
  .faq-list summary::after {
    right: 1rem;
    width: 24px;
    height: 24px;
    font-size: 1.1rem;
  }
  .faq-list details p {
    padding: 0 1.1rem 1rem;
    font-size: 0.88rem;
  }
  #news article,
  #articles article {
    padding: 1.2rem 1.15rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.6rem;
    padding: 2rem 1.2rem 1.2rem;
  }
  .footer-bottom {
    padding: 1.2rem 1.2rem 1.6rem;
  }
  #back-to-top {
    right: 1rem;
    bottom: 1rem;
    width: 44px;
    height: 44px;
  }
  #howto ol li {
    padding: 0.8rem 1rem 0.8rem 3rem;
  }
  #howto ol li::before {
    left: 0.7rem;
    width: 26px;
    height: 26px;
    font-size: 0.78rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }
  .hero-actions {
    flex-direction: column;
    gap: 0.7rem;
  }
  .btn-primary,
  .btn-secondary {
    width: 100%;
    padding: 0.8rem 1.4rem;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .carousel-dots {
    bottom: 10px;
  }
  .sitemap li a {
    padding: 0.45rem 0.95rem;
    font-size: 0.82rem;
  }
  #site-search {
    width: 105px;
  }
  #site-search:focus {
    width: 125px;
  }
  .logo strong {
    font-size: 0.82rem;
  }
  .logo svg {
    width: 36px;
    height: 36px;
  }
}

/* ===== Print ===== */
@media print {
  header,
  footer,
  #back-to-top,
  .hero-banner,
  .carousel-dots {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  section {
    padding: 1rem 0;
    page-break-inside: avoid;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}