:root {
  --color-primary: #1a56db;
  --color-primary-dark: #1e40af;
  --color-primary-light: #3b82f6;
  --color-accent: #7c3aed;
  --color-accent-2: #0f766e;
  --color-bg: #f6f8fc;
  --color-bg-alt: #ffffff;
  --color-surface: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.72);
  --color-border: rgba(15, 23, 42, 0.08);
  --color-text: #0f172a;
  --color-text-soft: #475569;
  --color-text-muted: #64748b;
  --color-shadow: rgba(15, 23, 42, 0.08);
  --color-shadow-strong: rgba(15, 23, 42, 0.16);
  --gradient-hero: linear-gradient(135deg, #1a56db 0%, #3b82f6 42%, #7c3aed 100%);
  --gradient-accent: linear-gradient(135deg, #1a56db 0%, #7c3aed 100%);
  --gradient-soft: linear-gradient(135deg, rgba(26, 86, 219, 0.08), rgba(124, 58, 237, 0.08));
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --container: 1200px;
  --header-h: 72px;
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

[data-theme="dark"] {
  --color-bg: #0b1120;
  --color-bg-alt: #111a2e;
  --color-surface: #16203a;
  --color-surface-glass: rgba(22, 32, 58, 0.72);
  --color-border: rgba(148, 163, 184, 0.16);
  --color-text: #e8eef9;
  --color-text-soft: #b6c2d9;
  --color-text-muted: #8a97b1;
  --color-shadow: rgba(0, 0, 0, 0.4);
  --color-shadow-strong: rgba(0, 0, 0, 0.6);
  --gradient-hero: linear-gradient(135deg, #12245c 0%, #1e3a8a 45%, #4c1d95 100%);
  --gradient-soft: linear-gradient(135deg, rgba(59, 130, 246, 0.14), rgba(139, 92, 246, 0.14));
}

*,
*::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-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(59, 130, 246, 0.1), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(124, 58, 237, 0.1), transparent 40%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 2px;
  border-radius: 6px;
}

h1, h2, h3, h4 {
  line-height: 1.35;
  color: var(--color-text);
  font-weight: 700;
  margin: 0 0 0.6em;
  letter-spacing: 0.01em;
}

h1 { font-size: clamp(1.7rem, 3.6vw, 2.7rem); }
h2 { font-size: clamp(1.4rem, 2.6vw, 2rem); }
h3 { font-size: clamp(1.12rem, 1.9vw, 1.4rem); }
h4 { font-size: 1.06rem; }

p { margin: 0 0 1em; }

ul, ol { margin: 0 0 1em; padding-left: 1.4em; }
li { margin-bottom: 0.4em; }

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

time { color: var(--color-text-muted); font-size: 0.9em; }

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 999;
  padding: 12px 20px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 12px;
  color: #fff;
}

/* ============ Header ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), box-shadow var(--transition);
}

#site-header.scrolled {
  box-shadow: 0 8px 32px var(--color-shadow);
}

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

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

.brand-logo {
  border-radius: 12px;
  box-shadow: 0 6px 18px rgba(26, 86, 219, 0.35);
  transition: transform var(--transition);
}

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

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.brand-slogan {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
}

.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;
}

.main-nav li { margin: 0; }

.main-nav a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-soft);
  border-radius: 999px;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

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

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

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

.site-search:focus-within {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.16);
}

.site-search input {
  border: none;
  background: transparent;
  color: var(--color-text);
  font-family: inherit;
  font-size: 0.86rem;
  width: 150px;
  padding: 6px 0;
  outline: none;
}

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

.site-search button {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  cursor: pointer;
  transition: transform var(--transition), filter var(--transition);
}

.site-search button:hover {
  transform: scale(1.08);
  filter: brightness(1.1);
}

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

#theme-toggle:hover {
  transform: rotate(20deg) scale(1.08);
  border-color: var(--color-primary-light);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0 9px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-surface);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 24px 0;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.84rem;
  color: var(--color-text-muted);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--color-text-muted);
  opacity: 0.6;
}

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

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

/* ============ Layout ============ */
main {
  display: block;
}

.section {
  max-width: var(--container);
  margin: 0 auto;
  padding: 72px 24px;
}

.section.alt {
  max-width: none;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section.alt > * {
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
}

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px;
}

.section-head h2 {
  position: relative;
  display: inline-block;
  padding-bottom: 16px;
}

.section-head h2::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 64px;
  height: 4px;
  border-radius: 4px;
  background: var(--gradient-accent);
}

.section-desc {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin: 0;
}

/* ============ Hero ============ */
.hero {
  max-width: var(--container);
  margin: 24px auto 0;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero-carousel {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 16 / 11;
  box-shadow: 0 24px 64px var(--color-shadow-strong);
  background: var(--gradient-hero);
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: scale(1.04);
  transition: opacity 0.7s ease, transform 0.9s ease;
  pointer-events: none;
}

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

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

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 42px;
  height: 42px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.22);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: #fff;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background var(--transition), transform var(--transition);
  z-index: 3;
}

.carousel-btn:hover {
  background: rgba(255, 255, 255, 0.4);
  transform: translateY(-50%) scale(1.1);
}

.carousel-btn.prev { left: 14px; }
.carousel-btn.next { right: 14px; }

.carousel-dots {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 3;
}

.carousel-dots .dot {
  width: 10px;
  height: 10px;
  padding: 0;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: width var(--transition), background var(--transition);
}

.carousel-dots .dot.active {
  width: 28px;
  background: #fff;
}

.hero-content h1 {
  margin-bottom: 20px;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-lead {
  color: var(--color-text-soft);
  font-size: 1rem;
  line-height: 1.85;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 28px 0 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 28px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  will-change: transform;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 10px 26px rgba(26, 86, 219, 0.35);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 16px 34px rgba(26, 86, 219, 0.45);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--color-border);
  box-shadow: 0 6px 18px var(--color-shadow);
}

.btn-secondary:hover {
  color: var(--color-accent);
  transform: translateY(-3px);
  border-color: var(--color-primary-light);
  box-shadow: 0 14px 30px var(--color-shadow-strong);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 0;
}

.hero-stats > div {
  padding: 16px 12px;
  text-align: center;
  border-radius: var(--radius-md);
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero-stats > div:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px var(--color-shadow);
}

.hero-stats dt {
  font-size: 0.76rem;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}

.hero-stats dd {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 0.01em;
}

[data-theme="dark"] .hero-stats dd {
  color: var(--color-primary-light);
}

/* ============ Cards generic ============ */
.product-card,
.solution-card,
.case-item,
.article-card,
.culture-item,
.adv-item,
.news-list li,
.contact-form-wrap,
.contact-info,
.eeat-box,
.howto {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 6px 24px var(--color-shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

/* ============ About ============ */
.about-block {
  margin-bottom: 40px;
}

.about-block h3 {
  display: flex;
  align-items: center;
  gap: 10px;
}

.about-block h3::before {
  content: "";
  width: 6px;
  height: 22px;
  border-radius: 4px;
  background: var(--gradient-accent);
  flex-shrink: 0;
}

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

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
  opacity: 0.4;
}

.timeline li {
  position: relative;
  padding: 10px 0 10px 36px;
  color: var(--color-text-soft);
  margin: 0;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 18px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 3px solid var(--color-primary);
  transition: transform var(--transition), border-color var(--transition);
}

.timeline li:hover::before {
  transform: scale(1.2);
  border-color: var(--color-accent);
}

.timeline strong {
  color: var(--color-primary);
  margin-right: 4px;
}

[data-theme="dark"] .timeline strong {
  color: var(--color-primary-light);
}

.culture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.culture-item {
  padding: 24px;
}

.culture-item:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px var(--color-shadow-strong);
  border-color: rgba(59, 130, 246, 0.35);
}

.culture-item h4 {
  color: var(--color-primary);
  margin-bottom: 8px;
}

[data-theme="dark"] .culture-item h4 {
  color: var(--color-primary-light);
}

.culture-item p {
  margin: 0;
  color: var(--color-text-soft);
  font-size: 0.94rem;
}

.eeat-box {
  padding: 28px;
  background: var(--gradient-soft);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
}

.eeat-box h3 {
  margin-top: 0;
}

.eeat-box p {
  margin-bottom: 8px;
  color: var(--color-text-soft);
  font-size: 0.94rem;
}

.eeat-box p:last-child {
  margin-bottom: 0;
}

/* ============ Products ============ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.product-card {
  padding: 30px 26px;
  position: relative;
  overflow: hidden;
}

.product-card::after {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: var(--gradient-soft);
  opacity: 0;
  transition: opacity var(--transition), transform var(--transition);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 22px 48px var(--color-shadow-strong);
  border-color: rgba(124, 58, 237, 0.3);
}

.product-card:hover::after {
  opacity: 1;
  transform: scale(1.3);
}

.product-card svg {
  border-radius: 14px;
  margin-bottom: 16px;
  transition: transform var(--transition);
}

.product-card:hover svg {
  transform: translateY(-4px) rotate(-4deg);
}

.product-card h3 {
  margin-bottom: 10px;
}

.product-card p {
  margin: 0;
  color: var(--color-text-soft);
  font-size: 0.94rem;
}

.advantages {
  margin-top: 56px;
}

.advantages > h3 {
  text-align: center;
  margin-bottom: 28px;
}

.adv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.adv-item {
  padding: 24px;
  border-radius: var(--radius-md);
}

.adv-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 36px var(--color-shadow-strong);
}

.adv-item h4 {
  color: var(--color-accent);
  margin-bottom: 8px;
}

[data-theme="dark"] .adv-item h4 {
  color: #a78bfa;
}

.adv-item p {
  margin: 0;
  color: var(--color-text-soft);
  font-size: 0.92rem;
}

/* ============ Solutions ============ */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.solution-card {
  padding: 30px 26px;
  position: relative;
  overflow: hidden;
}

.solution-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.solution-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 22px 48px var(--color-shadow-strong);
}

.solution-card:hover::before {
  transform: scaleX(1);
}

.solution-card h3 {
  margin-bottom: 12px;
  color: var(--color-text);
}

.solution-card p {
  margin: 0;
  color: var(--color-text-soft);
  font-size: 0.94rem;
}

/* ============ Cases ============ */
.case-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.case-item {
  padding: 30px 26px;
}

.case-item:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 44px var(--color-shadow-strong);
  border-color: rgba(15, 118, 110, 0.3);
}

.case-item h3 {
  margin-bottom: 12px;
}

.case-item p {
  margin: 0;
  color: var(--color-text-soft);
  font-size: 0.94rem;
}

.testimonials h3 {
  text-align: center;
  margin-bottom: 28px;
}

.testimonials blockquote {
  margin: 0 0 18px;
  padding: 24px 28px;
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 26px var(--color-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.testimonials blockquote:hover {
  transform: translateX(6px);
  box-shadow: 0 16px 36px var(--color-shadow-strong);
}

.testimonials blockquote p {
  font-style: italic;
  color: var(--color-text);
  margin-bottom: 10px;
}

.testimonials cite {
  display: block;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  font-style: normal;
}

/* ============ News ============ */
.news-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}

.news-list li {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 18px 24px;
  border-radius: var(--radius-md);
}

.news-list li:hover {
  transform: translateX(6px);
  border-color: var(--color-primary-light);
  box-shadow: 0 14px 32px var(--color-shadow-strong);
}

.news-list time {
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.86rem;
}

[data-theme="dark"] .news-list time {
  color: var(--color-primary-light);
}

.news-list a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
}

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

/* ============ Articles ============ */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.article-card {
  padding: 28px 26px;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 22px 48px var(--color-shadow-strong);
  border-color: rgba(59, 130, 246, 0.35);
}

.article-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

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

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

.article-meta {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.article-summary {
  color: var(--color-text-soft);
  font-size: 0.92rem;
  flex: 1;
}

.read-more {
  align-self: flex-start;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition), color var(--transition);
}

.read-more::after {
  content: "→";
  transition: transform var(--transition);
}

.read-more:hover {
  color: var(--color-accent);
}

.read-more:hover::after {
  transform: translateX(4px);
}

/* ============ HowTo ============ */
.howto {
  padding: 40px;
  max-width: 900px;
  margin: 0 auto;
}

.howto h3 {
  margin-top: 28px;
  padding-left: 14px;
  border-left: 4px solid var(--color-primary);
}

.howto h3:first-child {
  margin-top: 0;
}

.howto p,
.howto li {
  color: var(--color-text-soft);
}

.howto ol,
.howto ul {
  padding-left: 1.5em;
}

.howto ol li::marker {
  color: var(--color-primary);
  font-weight: 700;
}

/* ============ FAQ ============ */
.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

.faq-list details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 4px 24px;
  box-shadow: 0 4px 16px var(--color-shadow);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.faq-list details:hover {
  border-color: rgba(59, 130, 246, 0.35);
  box-shadow: 0 12px 30px var(--color-shadow-strong);
}

.faq-list details[open] {
  border-color: var(--color-primary-light);
  box-shadow: 0 16px 36px var(--color-shadow-strong);
}

.faq-list summary {
  cursor: pointer;
  padding: 18px 0;
  font-weight: 600;
  color: var(--color-text);
  list-style: none;
  position: relative;
  padding-right: 36px;
  transition: color var(--transition);
}

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

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--gradient-soft);
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1.1rem;
  transition: transform var(--transition), background var(--transition);
}

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

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

.faq-list details p {
  padding: 0 0 20px;
  margin: 0;
  color: var(--color-text-soft);
  font-size: 0.94rem;
  animation: fadeIn 0.4s ease;
}

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

/* ============ Contact ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: start;
}

.contact-info,
.contact-form-wrap {
  padding: 32px;
}

.contact-info h3,
.contact-form-wrap h3 {
  margin-top: 0;
}

.contact-info ul {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
}

.contact-info li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--color-border);
  color: var(--color-text-soft);
  font-size: 0.94rem;
}

.contact-info li:last-child {
  border-bottom: none;
}

.contact-info h3:not(:first-child) {
  margin-top: 24px;
}

.contact-info p {
  color: var(--color-text-soft);
  font-size: 0.94rem;
}

.contact-form-wrap form {
  display: grid;
  gap: 6px;
}

.contact-form-wrap label {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--color-text-soft);
  margin-top: 10px;
}

.contact-form-wrap input,
.contact-form-wrap textarea {
  width: 100%;
  padding: 12px 16px;
  font-family: inherit;
  font-size: 0.94rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.contact-form-wrap textarea {
  resize: vertical;
  min-height: 110px;
}

.contact-form-wrap input:focus,
.contact-form-wrap textarea:focus {
  outline: none;
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.16);
  background: var(--color-surface);
}

.contact-form-wrap .btn {
  margin-top: 18px;
  width: 100%;
}

/* ============ Sitemap & Links ============ */
.sitemap-list {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  max-width: 900px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  text-align: center;
}

.sitemap-list > li {
  padding: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.sitemap-list > li:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px var(--color-shadow);
}

.sitemap-list > li > a {
  font-weight: 600;
  color: var(--color-text);
}

.sitemap-list > li > a:hover {
  color: var(--color-primary);
}

.sitemap-list ul {
  list-style: none;
  padding: 8px 0 0;
  margin: 8px 0 0;
  border-top: 1px dashed var(--color-border);
  font-size: 0.85rem;
}

.sitemap-list ul li {
  margin: 4px 0;
}

.sitemap-list ul a {
  color: var(--color-text-muted);
}

.sitemap-list ul a:hover {
  color: var(--color-primary);
}

.friend-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.friend-links li {
  margin: 0;
}

.friend-links a {
  display: inline-block;
  padding: 10px 22px;
  font-size: 0.9rem;
  color: var(--color-text-soft);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: transform var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.friend-links a:hover {
  color: var(--color-primary);
  border-color: var(--color-primary-light);
  transform: translateY(-3px);
  box-shadow: 0 10px 24px var(--color-shadow);
}

/* ============ Footer ============ */
#site-footer {
  margin-top: 40px;
  background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-soft);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px 24px 32px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 40px;
}

.footer-col h2 {
  font-size: 1.02rem;
  margin-bottom: 14px;
  color: var(--color-text);
}

.footer-col p {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--color-text-muted);
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color var(--transition), padding-left var(--transition);
}

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

.footer-legal {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 40px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.footer-legal section {
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition);
}

.footer-legal section:hover {
  box-shadow: 0 10px 26px var(--color-shadow);
}

.footer-legal h2 {
  font-size: 0.94rem;
  margin-bottom: 8px;
  color: var(--color-text);
}

.footer-legal p {
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin: 0;
}

.footer-bottom {
  grid-column: 1 / -1;
  text-align: center;
  padding-top: 24px;
  margin-top: 8px;
  border-top: 1px solid var(--color-border);
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* ============ Back to top ============ */
#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(26, 86, 219, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), box-shadow var(--transition);
}

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

#back-to-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 16px 36px rgba(26, 86, 219, 0.55);
}

/* ============ Scroll reveal ============ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

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

@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; }
}

/* ============ Responsive ============ */
@media (max-width: 1080px) {
  .site-search input { width: 110px; }
  .main-nav a { padding: 8px 9px; font-size: 0.86rem; }
  .hero { grid-template-columns: 1fr; gap: 32px; }
  .hero-carousel { aspect-ratio: 16 / 9; order: -1; }
  .hero-stats { grid-template-columns: repeat(4, 1fr); }
}

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

  .menu-toggle { display: flex; }

  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--color-surface-glass);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 20px 40px var(--color-shadow-strong);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .main-nav.open {
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

  .main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 16px 20px;
  }

  .main-nav a {
    display: block;
    padding: 13px 16px;
    font-size: 0.98rem;
    border-radius: var(--radius-sm);
  }

  .site-search { display: none; }

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

  .footer-inner { grid-template-columns: 1fr 1fr; gap: 28px; }

  .howto { padding: 28px 22px; }
}

@media (max-width: 640px) {
  body { font-size: 15px; }

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

  .brand-slogan { display: none; }

  .section { padding: 52px 16px; }

  .hero { padding: 0 16px; margin-top: 16px; }

  .breadcrumb { padding: 12px 16px 0; }

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

  .hero-stats dd { font-size: 1.1rem; }

  .hero-cta { gap: 10px; }

  .btn { padding: 12px 22px; font-size: 0.9rem; flex: 1 1 auto; }

  .section-head { margin-bottom: 32px; }

  .product-grid,
  .solution-grid,
  .case-list,
  .article-grid,
  .culture-grid,
  .adv-grid { grid-template-columns: 1fr; gap: 16px; }

  .product-card,
  .solution-card,
  .case-item,
  .article-card,
  .culture-item,
  .adv-item { padding: 22px 20px; }

  .eeat-box { padding: 22px 20px; }

  .news-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 16px 18px;
  }

  .contact-info,
  .contact-form-wrap { padding: 22px 20px; }

  .footer-inner {
    grid-template-columns: 1fr;
    padding: 40px 16px 24px;
    gap: 24px;
  }

  .footer-legal { padding: 0 16px 32px; }

  .faq-list details { padding: 4px 18px; }

  .faq-list summary { font-size: 0.95rem; }

  .carousel-btn { width: 36px; height: 36px; font-size: 1.2rem; }

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

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

@media (max-width: 380px) {
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .brand-name { font-size: 0.98rem; }
}

/* ============ Print ============ */
@media print {
  #site-header,
  #back-to-top,
  .carousel-btn,
  .carousel-dots,
  .hero-cta,
  .contact-form-wrap,
  .site-search,
  #theme-toggle,
  .menu-toggle {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .slide { position: static; opacity: 1; }
  .hero-carousel { aspect-ratio: auto; }
  a { color: #000; text-decoration: underline; }
  .section { padding: 24px 0; }
}