:root {
  --bg: #f4f5fb;
  --bg-alt: #ffffff;
  --surface: #ffffff;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --border: rgba(26, 26, 46, 0.1);
  --text: #1f2333;
  --text-soft: #4a5068;
  --text-muted: #767c92;
  --primary: #e94560;
  --primary-dark: #c73650;
  --secondary: #533483;
  --accent: #0f3460;
  --navy: #1a1a2e;
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #0f3460 45%, #533483 100%);
  --gradient-btn: linear-gradient(135deg, #e94560 0%, #b83b8f 100%);
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.08);
  --shadow-md: 0 8px 28px rgba(26, 26, 46, 0.12);
  --shadow-lg: 0 18px 48px rgba(26, 26, 46, 0.18);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

html[data-theme="dark"] {
  --bg: #0e0f1a;
  --bg-alt: #141625;
  --surface: #1a1c2e;
  --surface-glass: rgba(26, 28, 46, 0.72);
  --border: rgba(255, 255, 255, 0.1);
  --text: #eef0fa;
  --text-soft: #b8bdd4;
  --text-muted: #8a90aa;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(233, 69, 96, 0.08), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(83, 52, 131, 0.1), transparent 46%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

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

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

ul,
ol {
  list-style-position: inside;
}

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

/* ============ Header ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--surface-glass);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), box-shadow var(--transition);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand a {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
}

.brand svg {
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}

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

.brand-name {
  font-size: 1.15rem;
  letter-spacing: 0.5px;
  background: var(--gradient-btn);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

#main-nav {
  flex: 1;
}

#main-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  list-style: none;
}

#main-nav a {
  display: block;
  padding: 8px 13px;
  font-size: 0.92rem;
  color: var(--text-soft);
  border-radius: var(--radius-full);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

#main-nav a:hover {
  color: #fff;
  background: var(--gradient-btn);
  transform: translateY(-2px);
}

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

#site-search {
  display: flex;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  padding: 3px 4px 3px 14px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

#site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.18);
}

#search-input {
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: 0.88rem;
  width: 180px;
  padding: 6px 0;
}

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

#site-search button {
  border: none;
  cursor: pointer;
  padding: 7px 16px;
  border-radius: var(--radius-full);
  background: var(--gradient-btn);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  transition: filter var(--transition), transform var(--transition);
}

#site-search button:hover {
  filter: brightness(1.1);
  transform: scale(1.04);
}

#theme-toggle,
#menu-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

#theme-toggle:hover,
#menu-toggle:hover {
  transform: rotate(15deg) scale(1.08);
  box-shadow: var(--shadow-md);
}

#menu-toggle {
  display: none;
}

.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px 10px;
}

.breadcrumb ol {
  display: flex;
  list-style: none;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

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

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

/* ============ Main layout ============ */
main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

main > section {
  margin-top: 64px;
  scroll-margin-top: 100px;
  animation: fadeUp 0.7s ease both;
}

main > section:nth-child(2) { animation-delay: 0.05s; }
main > section:nth-child(3) { animation-delay: 0.1s; }
main > section:nth-child(4) { animation-delay: 0.15s; }
main > section:nth-child(5) { animation-delay: 0.2s; }

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

main h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.35;
  margin-bottom: 18px;
  position: relative;
  padding-left: 18px;
  letter-spacing: 0.3px;
}

main h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: var(--radius-full);
  background: var(--gradient-btn);
}

main h3 {
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  margin: 34px 0 14px;
  color: var(--text);
}

main p {
  color: var(--text-soft);
  margin-bottom: 14px;
}

main ul,
main ol {
  color: var(--text-soft);
  margin: 0 0 18px 4px;
}

main li {
  margin-bottom: 8px;
}

main strong {
  color: var(--text);
}

/* ============ Hero ============ */
#hero {
  position: relative;
  margin-top: 28px;
  padding: 56px 48px;
  border-radius: var(--radius-lg);
  background: var(--gradient-hero);
  color: #f5f5f5;
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 40px;
  align-items: center;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  isolation: isolate;
}

#hero::before,
#hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.55;
  z-index: -1;
}

#hero::before {
  width: 380px;
  height: 380px;
  background: #e94560;
  top: -140px;
  right: -80px;
  animation: floatBlob 12s ease-in-out infinite alternate;
}

#hero::after {
  width: 300px;
  height: 300px;
  background: #533483;
  bottom: -120px;
  left: -60px;
  animation: floatBlob 14s ease-in-out infinite alternate-reverse;
}

@keyframes floatBlob {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(30px, -25px) scale(1.15); }
}

.hero-content h1 {
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
  color: #fff;
}

.hero-lead {
  font-size: 1rem;
  color: rgba(245, 245, 245, 0.85);
  margin-bottom: 28px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 30px;
}

.stat {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-md);
  padding: 14px 10px;
  text-align: center;
  transition: transform var(--transition), background var(--transition);
}

.stat:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, 0.16);
}

.stat .num {
  display: block;
  font-size: clamp(1.3rem, 2.4vw, 1.75rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
}

.stat .label {
  display: block;
  font-size: 0.76rem;
  color: rgba(245, 245, 245, 0.75);
  margin-top: 4px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.btn-primary {
  background: var(--gradient-btn);
  color: #fff;
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.45);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 14px 34px rgba(233, 69, 96, 0.6);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.35);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.22);
  transform: translateY(-3px);
}

.hero-visual svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  animation: floatCard 6s ease-in-out infinite alternate;
}

@keyframes floatCard {
  from { transform: translateY(0); }
  to { transform: translateY(-14px); }
}

/* ============ Cards / grids ============ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin: 20px 0 10px;
}

.product-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px 22px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.product-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--gradient-btn);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.4);
}

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

.product-card h4 {
  font-size: 1.08rem;
  margin-bottom: 10px;
  color: var(--text);
}

.product-card p {
  font-size: 0.92rem;
  margin-bottom: 0;
}

.scenario-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 18px;
}

.scenario-list article {
  background: var(--surface-glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.scenario-list article:hover {
  transform: translateY(-6px) rotate(-0.4deg);
  box-shadow: var(--shadow-md);
}

.scenario-list h4 {
  margin-bottom: 8px;
  color: var(--text);
  font-size: 1.02rem;
}

.scenario-list p {
  font-size: 0.92rem;
  margin-bottom: 0;
}

/* ============ Timeline ============ */
.timeline {
  list-style: none;
  position: relative;
  margin: 20px 0 10px;
  padding-left: 26px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 3px;
  border-radius: var(--radius-full);
  background: linear-gradient(180deg, var(--primary), var(--secondary));
}

.timeline li {
  position: relative;
  padding: 10px 16px;
  margin-bottom: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 50%;
  transform: translateY(-50%);
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.25);
}

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

/* ============ Cases ============ */
.case-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 5px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 18px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

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

.case-item p {
  margin-bottom: 0;
  font-size: 0.94rem;
}

blockquote {
  position: relative;
  background: var(--surface-glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px 24px 22px 56px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

blockquote::before {
  content: "\201C";
  position: absolute;
  left: 16px;
  top: 4px;
  font-size: 3rem;
  line-height: 1;
  color: var(--primary);
  opacity: 0.55;
  font-family: Georgia, serif;
}

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

blockquote p {
  margin-bottom: 0;
  font-style: italic;
  color: var(--text-soft);
}

/* ============ News ============ */
.news-list {
  list-style: none;
  margin: 10px 0 0;
}

.news-list li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 14px 18px;
  margin-bottom: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), border-color var(--transition);
}

.news-list li:hover {
  transform: translateX(6px);
  border-color: rgba(233, 69, 96, 0.4);
}

.news-list time {
  flex-shrink: 0;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}

/* ============ Articles ============ */
.article-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px 26px;
  margin-bottom: 18px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(83, 52, 131, 0.4);
}

.article-card h3 {
  margin: 0 0 6px;
  font-size: 1.14rem;
}

.article-card .meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.article-card p {
  font-size: 0.94rem;
}

.article-card a {
  display: inline-block;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  background: rgba(233, 69, 96, 0.1);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.article-card a:hover {
  background: var(--gradient-btn);
  color: #fff;
  transform: translateX(4px);
}

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

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

#faq summary {
  cursor: pointer;
  padding: 16px 52px 16px 20px;
  font-weight: 700;
  color: var(--text);
  position: relative;
  list-style: none;
  transition: color var(--transition), background var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(233, 69, 96, 0.12);
  color: var(--primary);
  font-size: 1.2rem;
  font-weight: 700;
  transition: transform var(--transition), background var(--transition);
}

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

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

#faq details p {
  padding: 0 20px 18px;
  margin: 0;
  font-size: 0.94rem;
  animation: fadeUp 0.35s ease both;
}

/* ============ HowTo ============ */
#howto ol,
#howto ul {
  padding-left: 6px;
}

#howto ol li {
  padding: 10px 16px;
  margin-bottom: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), border-color var(--transition);
}

#howto ol li:hover {
  transform: translateX(6px);
  border-color: rgba(83, 52, 131, 0.45);
}

/* ============ Contact ============ */
.contact-info {
  background: var(--surface-glass);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 30px;
  box-shadow: var(--shadow-md);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 6px 32px;
}

.contact-info p {
  margin-bottom: 10px;
  font-size: 0.94rem;
}

.contact-info strong {
  color: var(--primary);
}

/* ============ Sitemap & Links ============ */
.sitemap-list,
.friend-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 10px 0 0;
}

.sitemap-list a,
.friend-links a {
  display: inline-block;
  padding: 9px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: var(--text-soft);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), background var(--transition), color var(--transition), box-shadow var(--transition);
}

.sitemap-list a:hover,
.friend-links a:hover {
  background: var(--gradient-btn);
  color: #fff;
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* ============ Footer ============ */
#site-footer {
  background: linear-gradient(160deg, #14162a 0%, #1a1a2e 55%, #221c3d 100%);
  color: #c9cde0;
  padding: 56px 24px 40px;
  position: relative;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 40px;
}

.footer-brand p {
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: #a8aec6;
}

.footer-brand strong {
  color: #fff;
  font-size: 1.05rem;
}

.footer-legal h3 {
  font-size: 0.95rem;
  color: #fff;
  margin: 0 0 6px;
}

.footer-legal p {
  font-size: 0.84rem;
  color: #9aa0ba;
  margin-bottom: 14px;
  line-height: 1.7;
}

.footer-meta {
  grid-column: 1 / -1;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
}

.footer-meta p {
  font-size: 0.8rem;
  color: #8a90aa;
  margin: 0;
}

#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  z-index: 900;
  border: none;
  cursor: pointer;
  padding: 12px 18px;
  border-radius: var(--radius-full);
  background: var(--gradient-btn);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  box-shadow: 0 10px 26px rgba(233, 69, 96, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), filter var(--transition);
}

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

#back-to-top:hover {
  filter: brightness(1.12);
  transform: translateY(-4px);
}

/* ============ Responsive ============ */
@media (max-width: 1080px) {
  #hero {
    grid-template-columns: 1fr;
    padding: 44px 34px;
  }

  .hero-visual {
    max-width: 560px;
    margin: 0 auto;
  }

  #main-nav a {
    padding: 7px 10px;
    font-size: 0.86rem;
  }

  #search-input {
    width: 130px;
  }
}

@media (max-width: 900px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
  }

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

  #main-nav {
    order: 5;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
  }

  #main-nav.is-open {
    max-height: 520px;
  }

  #main-nav ul {
    flex-direction: column;
    gap: 2px;
    padding: 8px 0;
  }

  #main-nav a {
    padding: 11px 16px;
    border-radius: var(--radius-sm);
    background: var(--surface);
    border: 1px solid var(--border);
  }

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

  #search-input {
    width: 100%;
  }

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

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

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

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

  .brand-name {
    font-size: 1rem;
  }

  .breadcrumb {
    padding: 0 14px 8px;
  }

  main {
    padding: 0 14px 60px;
  }

  main > section {
    margin-top: 46px;
  }

  #hero {
    margin-top: 18px;
    padding: 34px 22px;
    border-radius: var(--radius-md);
    gap: 28px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }

  .hero-stats {
    gap: 10px;
  }

  .stat {
    padding: 12px 6px;
  }

  .stat .label {
    font-size: 0.7rem;
  }

  .product-grid,
  .scenario-list {
    grid-template-columns: 1fr;
  }

  .contact-info {
    padding: 22px 18px;
    grid-template-columns: 1fr;
  }

  .news-list li {
    flex-direction: column;
    gap: 4px;
  }

  .article-card,
  .case-item {
    padding: 18px;
  }

  #faq summary {
    padding: 14px 46px 14px 16px;
    font-size: 0.94rem;
  }

  #faq details p {
    padding: 0 16px 16px;
  }

  #site-footer {
    padding: 40px 16px 90px;
  }

  #back-to-top {
    right: 14px;
    bottom: 16px;
    padding: 10px 16px;
  }
}

/* ============ Reduced motion ============ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============ Print ============ */
@media print {
  #site-header,
  #back-to-top,
  .hero-actions,
  #site-footer {
    display: none !important;
  }

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

  main > section {
    animation: none;
  }
}