:root {
  --bg-primary: #f7f7fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #eef0f6;
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a5a;
  --text-muted: #8a8a9a;
  --accent: #e94560;
  --accent-soft: #f2a6b3;
  --accent-gold: #f5c542;
  --accent-blue: #0f3460;
  --accent-navy: #16213e;
  --border-color: rgba(26, 26, 46, 0.08);
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.5);
  --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);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Noto Serif SC", "Songti SC", serif;
  --header-height: 68px;
  --max-width: 1200px;
}

[data-theme="dark"] {
  --bg-primary: #0d0d1a;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --text-primary: #eaeaf2;
  --text-secondary: #b8b8c8;
  --text-muted: #7a7a8a;
  --accent: #ff5c77;
  --accent-soft: #f2a6b3;
  --border-color: rgba(255, 255, 255, 0.08);
  --glass-bg: rgba(26, 26, 46, 0.72);
  --glass-border: rgba(255, 255, 255, 0.1);
  --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);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: #0d0d1a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --text-primary: #eaeaf2;
    --text-secondary: #b8b8c8;
    --text-muted: #7a7a8a;
    --accent: #ff5c77;
    --accent-soft: #f2a6b3;
    --border-color: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(26, 26, 46, 0.72);
    --glass-border: rgba(255, 255, 255, 0.1);
    --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);
  }
}

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

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

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

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

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

a:hover {
  opacity: 0.82;
}

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

ul,
ol {
  list-style: none;
}

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

input,
button,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

.visually-hidden {
  position: absolute;
  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(--glass-bg);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#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: 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.04);
  opacity: 1;
}

.logo svg {
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.28);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.logo:hover svg {
  box-shadow: 0 6px 20px rgba(233, 69, 96, 0.45);
  transform: rotate(-4deg);
}

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

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

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

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

#site-header nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

#site-header nav a:hover {
  color: var(--accent);
  background: rgba(233, 69, 96, 0.08);
  opacity: 1;
}

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

#site-header form[role="search"] {
  display: flex;
  align-items: center;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  padding: 4px 4px 4px 16px;
  border: 1px solid transparent;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  flex-shrink: 0;
}

#site-header form[role="search"]:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(233, 69, 96, 0.12);
  background: var(--bg-secondary);
}

#site-header input[type="search"] {
  border: none;
  background: transparent;
  color: var(--text-primary);
  padding: 8px 8px 8px 0;
  width: 170px;
  font-size: 0.88rem;
  outline: none;
  transition: width var(--transition-base);
}

#site-header input[type="search"]::placeholder {
  color: var(--text-muted);
}

#site-header input[type="search"]:focus {
  width: 210px;
}

#site-header form[role="search"] button {
  background: var(--accent);
  color: #fff;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

#site-header form[role="search"] button:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 14px rgba(233, 69, 96, 0.4);
  background: #d63a54;
}

#dark-mode-toggle,
#mobile-menu-toggle {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  background: var(--bg-tertiary);
  transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
  flex-shrink: 0;
}

#dark-mode-toggle:hover,
#mobile-menu-toggle:hover {
  transform: scale(1.1) rotate(8deg);
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(233, 69, 96, 0.4);
}

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

/* ===== Main Layout ===== */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 80px;
}

main > nav[aria-label="面包屑导航"] {
  padding: 20px 0 8px;
}

main > nav[aria-label="面包屑导航"] ol {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

main > nav[aria-label="面包屑导航"] li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--text-muted);
  opacity: 0.5;
}

main > nav[aria-label="面包屑导航"] a {
  color: var(--text-secondary);
}

main > nav[aria-label="面包屑导航"] a:hover {
  color: var(--accent);
}

main > nav[aria-label="面包屑导航"] li[aria-current="page"] {
  color: var(--accent);
  font-weight: 600;
}

/* ===== Sections ===== */
main > section {
  margin-top: 56px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

main > section > h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 28px;
  position: relative;
  padding-left: 20px;
  line-height: 1.3;
}

main > section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.15em;
  bottom: 0.15em;
  width: 5px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-gold));
}

main > section > h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--text-primary);
  line-height: 1.4;
}

main > section > h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 20px 0 8px;
  color: var(--accent);
}

main > section > p {
  color: var(--text-secondary);
  margin-bottom: 14px;
  max-width: 78ch;
}

main > section > p strong {
  color: var(--accent);
  font-weight: 700;
}

/* ===== Hero ===== */
#hero {
  position: relative;
  padding: 48px 36px 40px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--accent-navy) 0%, var(--accent-blue) 50%, var(--accent) 130%);
  overflow: hidden;
  color: #fff;
  box-shadow: var(--shadow-lg);
  animation: heroFadeIn 0.8s ease both;
}

#hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -15%;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.45) 0%, transparent 70%);
  pointer-events: none;
  animation: floatOrb 12s ease-in-out infinite;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245, 197, 66, 0.28) 0%, transparent 70%);
  pointer-events: none;
  animation: floatOrb 16s ease-in-out infinite reverse;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, 30px) scale(1.08); }
}

@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

#hero > * {
  position: relative;
  z-index: 1;
}

#hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.3);
  animation: slideUp 0.7s ease 0.1s both;
}

#hero > p {
  color: rgba(255, 255, 255, 0.88);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 16px;
  max-width: 72ch;
  animation: slideUp 0.7s ease 0.2s both;
}

#hero > p strong {
  color: var(--accent-gold);
  font-weight: 700;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin: 28px 0 36px;
  animation: slideUp 0.7s ease 0.3s both;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base), color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.4);
}

.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.35) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform 0.6s ease;
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 14px 36px rgba(233, 69, 96, 0.55);
  opacity: 1;
}

.btn-primary:hover::after {
  transform: translateX(120%);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.26);
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.28);
  opacity: 1;
}

/* ===== Banner Carousel ===== */
.banner-carousel {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 36px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  animation: slideUp 0.7s ease 0.4s both;
}

.banner-slide {
  display: none;
  animation: bannerFade 0.6s ease;
}

.banner-slide.active {
  display: block;
}

@keyframes bannerFade {
  from { opacity: 0; transform: scale(1.02); }
  to { opacity: 1; transform: scale(1); }
}

.banner-slide svg {
  width: 100%;
  height: auto;
  display: block;
}

.banner-prev,
.banner-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: #fff;
  font-size: 1.6rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.25);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  z-index: 2;
}

.banner-prev {
  left: 16px;
}

.banner-next {
  right: 16px;
}

.banner-prev:hover,
.banner-next:hover {
  background: var(--accent);
  transform: translateY(-50%) scale(1.12);
  box-shadow: 0 6px 20px rgba(233, 69, 96, 0.5);
}

/* ===== Stats Bar ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 24px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  animation: slideUp 0.7s ease 0.5s both;
}

.stat-item {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
}

.stat-item + .stat-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  height: 60%;
  width: 1px;
  background: rgba(255, 255, 255, 0.2);
}

.stat-number {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--accent-gold);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 2px 12px rgba(245, 197, 66, 0.4);
}

.stat-item > span:last-child {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.82);
  letter-spacing: 0.04em;
}

/* ===== About ===== */
#about {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: background var(--transition-base), border-color var(--transition-base);
}

#about > h3:first-of-type {
  margin-top: 0;
}

/* ===== Products ===== */
#products {
  display: block;
}

#products > h3 {
  border-left: 4px solid var(--accent);
  padding-left: 14px;
}

#products > h4 {
  display: inline-block;
  padding: 4px 14px;
  background: linear-gradient(135deg, rgba(233, 69, 96, 0.12), rgba(245, 197, 66, 0.12));
  border-radius: var(--radius-full);
  border: 1px solid rgba(233, 69, 96, 0.2);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

#products > h4:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
}

/* ===== Solutions ===== */
#solutions {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: background var(--transition-base), border-color var(--transition-base);
}

#solutions > h3 {
  padding: 14px 20px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  margin-top: 20px;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  border-left: 4px solid var(--accent);
}

#solutions > h3:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, rgba(233, 69, 96, 0.08), transparent);
}

/* ===== Cases ===== */
#cases blockquote {
  position: relative;
  margin: 16px 0;
  padding: 20px 24px 20px 56px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#cases blockquote::before {
  content: "\201C";
  position: absolute;
  left: 18px;
  top: 8px;
  font-size: 3.2rem;
  line-height: 1;
  color: var(--accent);
  font-family: var(--font-serif);
  opacity: 0.5;
}

#cases blockquote:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.3);
}

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

/* ===== News ===== */
#news article {
  position: relative;
  padding: 24px 28px;
  margin-bottom: 18px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  overflow: hidden;
}

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

#news article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(233, 69, 96, 0.25);
}

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

#news article h3 {
  font-size: 1.1rem;
  margin: 0 0 6px;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

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

#news article time {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  padding: 2px 10px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
}

#news article p {
  color: var(--text-secondary);
  margin: 0;
  font-size: 0.95rem;
}

/* ===== Articles ===== */
#articles article {
  position: relative;
  padding: 28px;
  margin-bottom: 20px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#articles article:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(233, 69, 96, 0.3);
}

#articles article h3 {
  font-size: 1.15rem;
  margin: 0 0 8px;
  color: var(--text-primary);
  line-height: 1.4;
  transition: color var(--transition-fast);
}

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

#articles article time {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 2px 10px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
}

#articles article p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  background: rgba(233, 69, 96, 0.08);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast), gap var(--transition-fast);
}

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

#articles article a:hover {
  background: var(--accent);
  color: #fff;
  transform: translateX(4px);
  box-shadow: 0 6px 18px rgba(233, 69, 96, 0.35);
  opacity: 1;
}

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

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

#faq details:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.25);
}

#faq details[open] {
  border-color: rgba(233, 69, 96, 0.4);
  box-shadow: var(--shadow-md);
}

#faq summary {
  position: relative;
  padding: 18px 52px 18px 24px;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition-fast), background var(--transition-fast);
  user-select: none;
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 400;
  transition: transform var(--transition-base), background var(--transition-base), color var(--transition-base);
}

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

#faq summary:hover {
  color: var(--accent);
  background: rgba(233, 69, 96, 0.05);
}

#faq details p {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  animation: faqReveal 0.35s ease;
}

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

/* ===== HowTo ===== */
#howto {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  counter-reset: howto-step;
  transition: background var(--transition-base), border-color var(--transition-base);
}

#howto > h3:first-of-type {
  margin-top: 0;
}

#howto > h4 {
  counter-increment: howto-step;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  margin-top: 18px;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
}

#howto > h4::before {
  content: counter(howto-step);
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent), var(--accent-gold));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.35);
}

#howto > h4:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, rgba(233, 69, 96, 0.08), transparent);
}

/* ===== Contact ===== */
#contact {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: background var(--transition-base), border-color var(--transition-base);
}

#contact address {
  font-style: normal;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px 24px;
  padding: 24px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  border-left: 4px solid var(--accent);
}

#contact address p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin: 0;
  padding: 6px 0;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

#contact address p:hover {
  color: var(--text-primary);
  transform: translateX(4px);
}

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

#contact h3 {
  margin-top: 24px;
}

/* ===== Sitemap & Links ===== */
#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

#sitemap li a,
#links li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), color var(--transition-base), border-color var(--transition-base), background var(--transition-base);
  position: relative;
  overflow: hidden;
}

#sitemap li a::before,
#links li a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform var(--transition-base);
}

#sitemap li a:hover,
#links li a:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  color: var(--accent);
  border-color: rgba(233, 69, 96, 0.3);
  opacity: 1;
}

#sitemap li a:hover::before,
#links li a:hover::before {
  transform: scaleY(1);
}

#links li a {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
}

/* ===== Footer ===== */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 56px 24px 32px;
  margin-top: 40px;
  transition: background var(--transition-base), border-color var(--transition-base);
}

footer > section {
  max-width: var(--max-width);
  margin: 0 auto 28px;
}

footer > section h2 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
  position: relative;
  padding-bottom: 8px;
}

footer > section h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-gold));
}

footer > section p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
  max-width: 70ch;
}

footer > section ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}

footer > section ul li a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  position: relative;
  transition: color var(--transition-fast), padding var(--transition-fast);
}

footer > section ul li a::before {
  content: "›";
  margin-right: 6px;
  color: var(--accent);
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

footer > section ul li a:hover {
  color: var(--accent);
  padding-left: 4px;
  opacity: 1;
}

footer > section ul li a:hover::before {
  opacity: 1;
}

footer > section:last-child {
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
  margin-bottom: 0;
}

footer > section:last-child h2 {
  font-size: 0.95rem;
}

footer > section:last-child p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

footer > section:last-child time {
  color: var(--accent);
  font-weight: 600;
}

/* ===== Back to Top ===== */
#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--accent);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.85);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  z-index: 900;
}

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

#back-to-top:hover {
  transform: translateY(-5px) scale(1.1);
  box-shadow: 0 14px 36px rgba(233, 69, 96, 0.6);
  background: #d63a54;
}

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

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

/* ===== Selection ===== */
::selection {
  background: rgba(233, 69, 96, 0.28);
  color: var(--text-primary);
}

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

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

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

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

/* ===== Responsive: Tablet ===== */
@media (max-width: 1024px) {
  .header-inner {
    gap: 14px;
    padding: 0 18px;
  }

  #site-header nav a {
    padding: 8px 9px;
    font-size: 0.84rem;
  }

  #site-header input[type="search"] {
    width: 130px;
  }

  #site-header input[type="search"]:focus {
    width: 160px;
  }

  #hero {
    padding: 40px 28px 32px;
  }

  #about,
  #solutions,
  #howto,
  #contact {
    padding: 32px 28px;
  }
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  body {
    font-size: 15px;
  }

  .header-inner {
    padding: 0 14px;
    gap: 10px;
  }

  .logo span {
    display: none;
  }

  #site-header nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-base);
    box-shadow: var(--shadow-lg);
    padding: 0 14px;
  }

  #site-header.nav-open nav {
    max-height: 70vh;
    overflow-y: auto;
    padding: 12px 14px 20px;
  }

  #site-header nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    overflow: visible;
  }

  #site-header nav a {
    padding: 13px 16px;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    background: transparent;
  }

  #site-header nav a::after {
    display: none;
  }

  #site-header nav a:hover {
    background: rgba(233, 69, 96, 0.1);
  }

  #site-header form[role="search"] {
    order: 3;
    flex: 1;
    min-width: 0;
    padding: 3px 3px 3px 12px;
  }

  #site-header input[type="search"] {
    width: 100%;
    min-width: 0;
    font-size: 0.82rem;
    padding: 7px 4px 7px 0;
  }

  #site-header input[type="search"]:focus {
    width: 100%;
  }

  #site-header form[role="search"] button {
    padding: 7px 14px;
    font-size: 0.8rem;
  }

  #mobile-menu-toggle {
    display: flex;
  }

  #dark-mode-toggle,
  #mobile-menu-toggle {
    width: 38px;
    height: 38px;
    font-size: 1rem;
  }

  main {
    padding: 0 14px 60px;
  }

  main > section {
    margin-top: 40px;
  }

  main > section > h2 {
    font-size: 1.3rem;
    padding-left: 16px;
    margin-bottom: 20px;
  }

  main > section > h2::before {
    width: 4px;
  }

  #hero {
    padding: 32px 20px 28px;
    border-radius: var(--radius-md);
  }

  #hero h1 {
    font-size: 1.45rem;
  }

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

  .hero-actions {
    gap: 12px;
    margin: 22px 0 28px;
  }

  .btn-primary,
  .btn-secondary {
    flex: 1 1 auto;
    padding: 13px 20px;
    font-size: 0.88rem;
    justify-content: center;
  }

  .banner-prev,
  .banner-next {
    width: 36px;
    height: 36px;
    font-size: 1.3rem;
  }

  .banner-prev {
    left: 8px;
  }

  .banner-next {
    right: 8px;
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px 12px;
    padding: 20px 16px;
  }

  .stat-item:nth-child(3)::before {
    display: none;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  #about,
  #solutions,
  #howto,
  #contact {
    padding: 24px 18px;
    border-radius: var(--radius-md);
  }

  #news article,
  #articles article {
    padding: 20px 18px;
  }

  #news article h3,
  #articles article h3 {
    font-size: 1rem;
  }

  #solutions > h3 {
    padding: 12px 16px;
    font-size: 1.05rem;
  }

  #howto > h4 {
    padding: 13px 16px;
    font-size: 0.95rem;
  }

  #howto > h4::before {
    width: 28px;
    height: 28px;
    font-size: 0.82rem;
  }

  #faq summary {
    padding: 15px 48px 15px 18px;
    font-size: 0.93rem;
  }

  #faq summary::after {
    right: 16px;
    width: 24px;
    height: 24px;
    font-size: 1.05rem;
  }

  #faq details p {
    padding: 0 18px 18px;
    font-size: 0.9rem;
  }

  #contact address {
    grid-template-columns: 1fr;
    padding: 18px;
    gap: 4px;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  #sitemap li a,
  #links li a {
    padding: 12px 14px;
    font-size: 0.85rem;
  }

  footer {
    padding: 40px 18px 28px;
  }

  footer > section ul {
    gap: 8px 18px;
  }

  #back-to-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
    font-size: 1.15rem;
  }
}

@media (max-width: 400px) {
  .header-inner {
    gap: 8px;
  }

  #site-header input[type="search"] {
    font-size: 0.78rem;
  }

  #site-header form[role="search"] button {
    padding: 7px 10px;
    font-size: 0.75rem;
  }

  .stats-bar {
    grid-template-columns: 1fr;
  }

  .stat-item + .stat-item::before {
    display: none;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: 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,
  #back-to-top,
  .banner-prev,
  .banner-next,
  #dark-mode-toggle,
  #mobile-menu-toggle,
  .hero-actions {
    display: none !important;
  }

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

  #hero {
    background: #f0f0f0;
    color: #000;
    box-shadow: none;
  }

  #hero h1,
  #hero > p,
  .stat-item > span:last-child {
    color: #000;
  }

  main > section {
    page-break-inside: avoid;
  }
}

/* ===== High Contrast ===== */
@media (prefers-contrast: high) {
  :root {
    --border-color: rgba(0, 0, 0, 0.3);
  }

  [data-theme="dark"] {
    --border-color: rgba(255, 255, 255, 0.3);
  }

  a:focus-visible,
  button:focus-visible {
    outline-width: 3px;
  }
}